国民经济行业分类号：
C4350 | C3874 | C4090 | C3879
当前申请(专利权)人：
HEFEI BOE OPTOELECTRONICS TECHNOLOGY CO., LTD. | BOE TECHNOLOGY GROUP CO., LTD.
原始申请(专利权)人：
HEFEI BOE OPTOELECTRONICS TECHNOLOGY CO., LTD. | BOE TECHNOLOGY GROUP CO., LTD.
当前申请(专利权)人地址：
NO. 2177 TONGLINGBEI ROAD, HEFEI, 230012, ANHUI, CHINA | NO. 10 JIUXIANQIAO RD., CHAOYANG DISTRICT, 100015, BEIJING, CHINA
工商统一社会信用代码：
911100001011016602|91340100680822891E
工商登记状态：
存续（在营、开业、在册）|存续（在营、开业、在册）
工商注册地址：
北京市朝阳区酒仙桥路10号|安徽省合肥市新站区铜陵北路2177号
工商成立日期：
1993-04-09|2008-10-16
发明人：
TANG, HAI | GAO, LIANG
摘要：
A backlight module includes a first light source, a first light guide plate, and an anti-peeping component, wherein the first light source is an edge-type light source of the first light guide plate, the first light guide plate is provided with a light emitting surface and a backlight surface that are opposite, wherein the anti-peeping component is on the light emitting surface, a refractive index of a dielectric in contact with the backlight surface is less than a refractive index of the first light guide plate; the anti-peeping component includes anti-peeping structures that is provided with a first surface proximal to the first light guide plate, a second surface distal from the first light guide plate, and two opposite third surfaces intersecting both the first surface and the second surface, an included angle between the third surface and the first surface being an obtuse angle.
技术问题语段：
The technical problem discussed in this patent text is the need for anti-peeping requirements for display apparatuses, particularly liquid crystal display apparatuses, as the anti-peeping display function is usually implemented from the backlight module.
技术功效语段：
This patent is about a method for controlling a backlight module in a sharing mode. The method involves emitting light from the first light source, which then passes through the first light guide plate and the anti-peeping structure before being emitted out of the anti-peeing component. The technical effect of this method is that it allows for better control of the light emitted from the backlight module, resulting in improved precision and accuracy in image quality.
权利要求：
1. A backlight module; comprising:
a first light source, a first light guide plate, and an anti-peeping component; wherein
the first light source is an edge-type light source of the first light guide plate;
the first light guide plate is provided with a light emitting surface and a backlight surface that are opposite, wherein both the light emitting surface and the backlight surface are flat surfaces, and the anti-peeping component is on the light emitting surface of the first light guide plate; and
the anti-peeping component comprises an anti-peeping layer comprising a plurality of anti-peeping structures, wherein the plurality of anti-peeping structures are arranged in multiple columns of an array, the anti-peeping structure is provided with a first surface proximal to the first light guide plate, a second surface distal from the first light guide plate, and two opposite third surfaces intersecting both the first surface and the second surface, an included angle between the third surface and the first surface being an obtuse angle, and the second surface being a free-form surface;
wherein the backlight module further comprises: a second light source, a second light guide plate, and a dielectric layer; wherein
the second light source is an edge-type light source of the second light guide plate;
the second light guide plate is provided with a light emitting surface and a backlight surface that are opposite, wherein the light emitting surface is a flat surface, the backlight surface is a dot pattern surface, the second light guide plate is on a side, distal from the anti-peeping component, of the first light guide plate, the light emitting surface of the second light guide plate is proximal to the first light guide plate, and the backlight surface of the second light guide plate is distal from the first light guide plate; and
the dielectric layer is between the first light guide plate and the second light guide plate and a refractive index of the dielectric layer is less than both the refractive index of the first light guide plate and a refractive index of the second light guide plate.
2. The backlight module according to claim 1, wherein the first surface satisfies one of the following:
the first surface is provided with a recess region and a flat region; and
the first surface is provided with a plurality of recess regions and a plurality of flat regions, so that the first surface is a serrated surface.
3. The backlight module according to claim 1, wherein the anti-peeping structure is further provided with two parallel end surfaces, wherein the end surfaces are in contact with each of the first surface, the second surface, and the two third surfaces.
4. The backlight module according to claim 1, wherein the anti-peeping structure satisfies one of the following:
the anti-peeping structure is strip-shaped, and each column of the anti-peeping layer is provided with one of the anti-peeping structures; and
the anti-peeping structure is block-shaped, and each column of the anti-peeping layer is provided with a plurality of the anti-peeping structures.
5. The backlight module according to claim 1, wherein the anti-peeping component further comprises: a connection layer on the anti-peeping layer, wherein the plurality of anti-peeping structures are inlaid in the connection layer.
6. The backlight module according to claim 5, wherein the anti-peeping structure is strip-shaped, and the connection layer comprises a plurality of connecting strips extending in a same direction, wherein the plurality of connecting strips are arranged in an array, each of the connecting strips intersecting the plurality of anti-peeping structures.
7. The backlight module according to claim 6, wherein the first surface is provided with a recess region and a flat region, and orthographic projections of the connecting strips on the anti-peeping layer fall within the recess region.
8. The backlight module according to claim 5, wherein the anti-peeping component further comprises: a filling layer, wherein the filling layer is on one of the position:
a side, distal from the anti-peeping layer, of the connection layer, and
a side, distal from the connection layer, of the anti-peeping layer;
a refractive index of the filling layer is less than the refractive index of the first light guide plate.
9. The backlight module according to claim 8, wherein the anti-peeping component further comprises: a substrate layer, wherein the anti-peeping layer and the connection layer are sequentially on the substrate layer, the substrate layer is attachable on the light emitting surface of the first light guide plate by an optical adhesive, and refractive indexes of the substrate layer, the optical adhesive, and the first light guide plate are equal.
10. The backlight module according to claim 1, wherein the backlight module further comprises:
a side reflective layer on a side surface of the first light guide plate, wherein the side reflective layer is opposite to the first light source; and
a bottom reflective layer on the backlight surface of the second light guide plate.
11. A method for manufacturing a backlight module, comprising:
manufacturing a first light source and a first light guide plate, wherein the first light guide plate is provided with a light emitting surface and a backlight surface that are opposite, both the light emitting surface and the backlight surface being flat surfaces;
manufacturing an anti-peeping component, wherein the anti-peeping component comprises an anti-peeping layer comprising a plurality of anti-peeping structures, wherein the plurality of anti-peeping structures are arranged in a multiple columns of an array, the anti-peeping structure is provided with a first surface and a second surface that are opposite, and two opposite third surfaces intersecting both the first surface and the second surface, an included angle between the third surface and the first surface being an obtuse angle, and the second surface being a free-form surface;
disposing the anti-peeping component on the light emitting surface of the first light guide plate, wherein the first surface of the anti-peeping structure is proximal to the first light guide plate, and the second surface is distal from the first light guide plate;
setting the first light source as an edge-type light source of the first light guide plate to obtain the backlight module;
manufacturing a second light source and a second light guide plate, wherein the second light guide plate is provided with a light emitting surface and a backlight surface that are opposite, the light emitting surface being a flat surface, and the backlight surface being a dot pattern surface;
disposing the second light guide plate on a side, distal from the anti-peeping component, of the first light guide plate, wherein the light emitting surface of the second light guide plate is proximal to the first light guide plate, the backlight surface of the second light guide plate is distal from the first light guide plate, a dielectric layer is between the first light guide plate and the second light guide plate, and a refractive index of the dielectric layer is less than both the refractive index of the first light guide plate and a refractive index of the second light guide plate; and
setting the second light source as an edge-type light source of the second light guide plate.
12. The method according to claim 11, wherein the anti-peeping component further comprises a connection layer; and
manufacturing the anti-peeping component comprises:
forming an anti-peeping layer; and
forming the connection layer on the anti-peeping layer, wherein the plurality of anti-peeping structures are inlaid into the connection layer.
13. The method according to claim 12, wherein the anti-peeping component further comprises a substrate layer;
before forming the anti-peeping layer, the method further comprises: forming the substrate layer;
forming the anti-peeping layer comprises: forming the anti-peeping layer on the substrate layer, wherein the first surface of the anti-peeping structure is in contact with the substrate layer, and the second surface is distal from the substrate layer; and
forming the connection layer on the anti-peeping layer comprises: forming the connection layer on the anti-peeping layer, wherein a filling layer is formed on one of the position: a side, distal from the anti-peeping layer, of the connection layer, and a side, distal from the connection layer, of the anti-peeping layer; a refractive index of the filling layer is less than the refractive index of the first light guide plate.
14. The method according to claim 11, wherein the method further comprises:
disposing a side reflective layer on a side surface of the first light guide plate, wherein the side reflective layer is opposite to the first light source; and
disposing a bottom reflective layer on the backlight surface of the second light guide plate.
15. A method for controlling a backlight module, applicable to the backlight module as defined in claim 1, the method comprising:
controlling, when the backlight module is in an anti-peeping mode, the first light source to emit light; wherein after being totally reflected on the backlight surface of the first light guide plate, the light emitted by the first light source sequentially passes through the light emitting surface of the first light guide plate and the first surface of the anti-peeping structure, and is emitted into the anti-peeping structure; and after being reflected on the third surface of the anti-peeping structure, the light passes through the second surface of the anti-peeping structure and is emitted out of the anti-peeping component.
16. The method according to claim 15, wherein the method further comprises:
controlling, when the backlight module is in an anti-peeping mode, a second light source to be turned off; and
controlling, when the backlight module is in a sharing mode, the second light source to emit light, wherein light emitted by the second light source is scattered by the backlight surface of a second light guide plate, is then emitted into a dielectric layer, sequentially passes through the dielectric layer and the first light guide plate to emit into the anti-peeping component, then passes through the plurality of anti-peeping structures and a region between each adjacent anti-peeping structures, and is emitted out of the anti-peeping component.
17. The method according to claim 15, wherein the method further comprises:
controlling, when the backlight module is in the sharing mode, the first light source to emit light, wherein after being totally reflected on the backlight surface of the first light guide plate, light emitted by the first light source sequentially passes through the light emitting surface of the first light guide plate and the first surface of the anti-peeping structure, and is then emitted into the anti-peeping structure; and after being reflected on the third surface of the anti-peeping structure, the light passes through the second surface of the anti-peeping structure and is emitted out of the anti-peeping component.
18. A display apparatus, comprising a display panel and the backlight module as defined in claim 1.
技术领域：
[0002]The present disclosure relates to a backlight module, a method for manufacturing same, a method for controlling same, and a display apparatus.
BACKGROUND
[0003]With the development of display technologies and increasing requirements for personal privacy protection, anti-peeping requirements of display apparatuses become higher and higher. A liquid crystal display apparatus is a widely used display apparatus, and includes a backlight module and a display panel. For the liquid crystal display apparatus, the anti-peeping display function is usually implemented from the backlight module.
发明内容：
[0004]The present disclosure provides a backlight module, a method for manufacturing same, a method for controlling same, and a display apparatus. Technical solutions of the present disclosure are as follows:
[0005]In one aspect, a backlight module is provided. The backlight module includes:
[0006]a first light source, a first light guide plate, and an anti-peeping component; wherein the first light source is an edge-type light source of the first light guide plate;
[0007]the first light guide plate is provided with a light emitting surface and a backlight surface that are opposite, wherein both the light emitting surface and the backlight surface are flat surfaces, the anti-peeping component is on the light emitting surface of the first light guide plate, and a refractive index of a dielectric in contact with the backlight surface of the first light guide plate is less than a refractive index of the first light guide plate; and
[0008]the anti-peeping component includes an anti-peeping layer including a plurality of anti-peeping structures, wherein the plurality of anti-peeping structures are arranged in multiple columns of an array, the anti-peeping structure is provided with a first surface proximal to the first light guide plate, a second surface distal from the first light guide plate, and two opposite third surfaces intersecting both the first surface and the second surface, an included angle between the third surface and the first surface being an obtuse angle, and the second surface being a free-form surface.
[0009]Optionally, the first surface satisfies one of the following:
[0010]the first surface is provided with a recess region and a flat region; and
[0011]the first surface is a serrated surface.
[0012]Optionally, the anti-peeping structure is further provided with two parallel end surfaces, wherein the end surfaces are in contact with each of the first surface, the second surface, and the two third surfaces.
[0013]Optionally, the anti-peeping structure satisfies one of the following:
[0014]The anti-peeping structure is strip-shaped, and each column of the anti-peeping layer is provided with one of the anti-peeping structures; and
[0015]the anti-peeping structure is block-shaped, and each column of the anti-peeping layer is provided with a plurality of the anti-peeping structures.
[0016]Optionally, the anti-peeping component further includes: a connection layer on the anti-peeping layer, wherein the plurality of anti-peeping structures are inlaid in the connection layer.
[0017]Optionally, the anti-peeping structure is strip-shaped, and the connection layer includes a plurality of connecting strips extending in a same direction, wherein the plurality of connecting strips are arranged in an array, each of the connecting strips intersecting the plurality of anti-peeping structures.
[0018]Optionally, the first surface is provided with a recess region and a flat region, and orthographic projections of the connecting strips on the anti-peeping layer fall within the recess region.
[0019]Optionally, the anti-peeping component further includes: a filling layer, wherein the filling layer is on one of the position:
[0020]a side, distal from the anti-peeping layer, of the connection layer, and
[0021]a side, distal from the connection layer, of the anti-peeping layer;
[0022]a refractive index of the filling layer is less than the refractive index of the first light guide plate.
[0023]Optionally, the anti-peeping component further includes: a substrate layer, wherein the anti-peeping layer and the connection layer are sequentially on the substrate layer, the substrate layer is attachable on the light emitting surface of the first light guide plate by an optical adhesive, and refractive indexes of the substrate layer, the optical adhesive, and the first light guide plate are equal.
[0024]Optionally, the backlight module further includes:
[0025]a second light source, a second light guide plate, and a dielectric layer, wherein the second light source is an edge-type light source of the second light guide plate;
[0026]the second light guide plate is provided with a light emitting surface and a backlight surface that are opposite, wherein the light emitting surface is a flat surface, the backlight surface is a dot pattern surface, the second light guide plate is on a side, distal from the anti-peeping component, of the first light guide plate, the light emitting surface of the second light guide plate is proximal to the first light guide plate, and the backlight surface of the second light guide plate is distal from the first light guide plate; and
[0027]the dielectric layer is between the first light guide plate and the second light guide plate, and a refractive index of the dielectric layer is less than both the refractive index of the first light guide plate and a refractive index of the second light guide plate.
[0028]Optionally, the backlight module further includes:
[0029]a side reflective layer on a side surface of the first light guide plate, wherein the side reflective layer is opposite to the first light source; and
[0030]a bottom reflective layer on the backlight surface of the second light guide plate.
[0031]In another aspect, a method for manufacturing a backlight module is provided. The method includes:
[0032]manufacturing a first light source and a first light guide plate, wherein the first light guide plate is provided with a light emitting surface and a backlight surface that are opposite, and both the light emitting surface and the backlight surface being flat surfaces;
[0033]manufacturing an anti-peeping component, wherein the anti-peeping component includes an anti-peeping layer including a plurality of anti-peeping structures, wherein the plurality of anti-peeping structures are arranged in multiple columns of an array, the anti-peeping structure is provided with a first surface and a second surface that are opposite, and two opposite third surfaces intersecting both the first surface and the second surface, an included angle between the third surface and the first surface being an obtuse angle, and the second surface being a free-form surface;
[0034]disposing the anti-peeping component on the light emitting surface of the first light guide plate, wherein the first surface of the anti-peeping structure is proximal to the first light guide plate, and the second surface is distal from the first light guide plate; and
[0035]setting the first light source as an edge-type light source of the first light guide plate, to obtain the backlight module, wherein a refractive index of a dielectric, in the backlight module, in contact with the backlight surface of the first light guide plate is less than a refractive index of the first light guide plate.
[0036]Optionally, the anti-peeping component further includes a connection layer; and
[0037]manufacturing the anti-peeping component includes:
[0038]forming an anti-peeping layer; and
[0039]forming the connection layer on the anti-peeping layer, wherein the plurality of anti-peeping structures are inlaid in the connection layer.
[0040]Optionally, the anti-peeping component further includes a substrate layer;
[0041]before forming the anti-peeping layer, the method further includes: forming the substrate layer;
[0042]forming the anti-peeping layer includes: forming the anti-peeping layer on the substrate layer, wherein the first surface of the anti-peeping structure is in contact with the substrate layer, and the second surface is distal from the base layer; and
[0043]forming the connection layer on the anti-peeping layer includes: forming the connection layer on the anti-peeping layer, wherein a filling layer is formed on one of the position: a side, distal from the anti-peeping layer, of the connection layer, and a side, distal from the connection layer, of the anti-peeping layer, and a refractive index of the filling layer is less than the refractive index of the first light guide plate.
[0044]Optionally, the method further includes:
[0045]manufacturing a second light source and a second light guide plate, wherein the second light guide plate is provided with a light emitting surface and a backlight surface that are opposite, the light emitting surface is a flat surface, and the backlight surface is a dot pattern surface;
[0046]disposing the second light guide plate on a side, distal from the anti-peeping component, of the first light guide plate, wherein the light emitting surface of the second light guide plate is proximal to the first light guide plate, the backlight surface of the second light guide plate is distal from the first light guide plate, the dielectric layer is between the first light guide plate and the second light guide plate, and a refractive index of the dielectric layer is less than both the refractive index of the first light guide plate and a refractive index of the second light guide plate; and
[0047]setting the second light source as an edge-type light source of the second light guide plate.
[0048]Optionally, the method further includes:
[0049]disposing a side reflective layer on a side surface of the first light guide plate, wherein the side reflective layer is opposite to the first light source; and
[0050]disposing a bottom reflective layer on the backlight surface of the second light guide plate.
[0051]In still another aspect, a method for controlling a backlight module is provided, applicable to the backlight module in the foregoing aspect. The method includes:
[0052]controlling, when the backlight module is in an anti-peeping mode, the first light source to emit light, wherein after being totally reflected on a backlight surface of the first light guide plate, the light emitted by the first light source sequentially passes through the light emitting surface of the first light guide plate and a first surface of an anti-peeping structure to emit into the anti-peeping structure; and after being reflected on the third surface of the anti-peeping structure, the light passes through the second surface of the anti-peeping structure and emits out from the anti-peeping component.
[0053]Optionally, the method further includes:
[0054]controlling, when the backlight module is in an anti-peeping mode, the second light source to be turned off; and
[0055]controlling, when the backlight module is in a sharing mode, the second light source to emit light, wherein light emitted by the second light source is scattered by the backlight surface of a second light guide plate, is then emitted into the dielectric layer, sequentially passes through the dielectric layer and the first light guide plate to emit into the anti-peeping component, then passes through the plurality of anti-peeping structures and a region between each adjacent anti-peeping structures to emit out of the anti-peeping component.
[0056]Optionally, the method further includes: controlling, when the backlight module is in the sharing mode, the first light source to emit light, wherein after being totally reflected on the backlight surface of the first light guide plate, light emitted by the first light source sequentially passes through the light emitting surface of the first light guide plate and the first surface of the anti-peeping structure, and is then emitted into the anti-peeping structure; and after being reflected on the third surface of the anti-peeping structure, the light passes through the second surface of the anti-peeping structure and is emitted out of the anti-peeping component.
[0057]In yet another aspect, a display apparatus is provided. The display apparatus includes a display panel and the backlight module in the foregoing aspect.
具体实施方式：
[0077]The accompanying drawings herein are incorporated into this specification and constitute a part of the specification, show embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.
DETAILED DESCRIPTION
[0078]To make the principles, technical solutions, and advantages of the present disclosure clearer, the present disclosure will be clearly described below with reference to the accompanying drawings. It is apparent that the described embodiments are merely some rather than all of the embodiments of the present disclosure. Based on the embodiments of the present disclosure, all the other embodiments obtained by a person of ordinary skill in the art without inventive efforts fall within the protection scope of the present disclosure.
[0079]The liquid crystal display apparatus usually includes a backlight module and a display panel. In a liquid crystal display apparatus having an anti-peeping display function, the backlight module includes a light guide plate, a light source, and an anti-peeping film and a polymer dispersed liquid crystal (PDLC) on a light emitting side of the light guide plate. After passing through the light guide plate, light emitted by the light source sequentially passes through the anti-peeping film and the PDLC and is emitted into the display panel, such that the display panel implements a display function. When an external electric field is applied to the PDLC, liquid crystal molecules in the PDLC are arranged orderly. An optical axis direction of the liquid crystal molecules is parallel to an electric field direction of the external electric field. A refractive index of the liquid crystal molecules matches a refractive index of a matrix of the PDLC to a certain degree. Light passes through the matrix to make the PDLC transparent, the backlight module is in an anti-peep mode, and the display panel implements an anti-peeping display function based on the light emitted into the display panel. When no external electric field is applied to the PDLC, the optical axis direction of the liquid crystal molecules in the PDLC is random, the liquid crystal molecules are in a disordered state, light emitted into the PDLC is scattered, the PDLC is in a scattered state, the backlight module is in a sharing mode, the PDLC scatters the light emitted into the PDLC and transmits the light to the display panel, and the display panel implements a shared display function based on the light emitted into the display panel. However, the PDLC is expensive and requires application of the external electric field to set the backlight module in an anti-peeping mode. Therefore, the backlight module has relatively high costs and power consumption, which leads to relatively high costs and power consumption of the liquid crystal display apparatus.
[0080]An embodiment of the present disclosure provides a backlight module, such that an anti-peeping mode of the backlight module can be implemented without using a PDLC, which helps reduce costs and power consumption of the backlight module, thereby reducing costs and power consumption of the display apparatus. The solutions of the present disclosure are described below with reference to the accompanying drawings.
[0081]Exemplarily, FIG. 1 is a schematic structural diagram of a backlight module 0 according to an embodiment of the present disclosure, and FIG. 2 is a right view of the backlight module 0 shown in FIG. 1. Referring to FIG. 1 and FIG. 2, the backlight module 0 includes: a first light source 01, a first light guide plate 02, and an anti-peeping component 03. The first light source 01 is an edge-type light source of the first light guide plate 02 (in other words, the first light source 01 is disposed on a side where a side surface of the first light guide plate 02 is disposed). The first light guide plate 02 is provided with a light emitting surface M1 and a backlight surface M2 that are opposite. Both the light emitting surface M1 and the backlight surface M2 are flat surfaces, the anti-peeping component 03 is disposed on the light emitting surface M1 of the first light guide plate 02, and a refractive index of a dielectric, in the backlight module 0, in contact with the backlight surface M2 of the first light guide plate 02 is less than a refractive index of the first light guide plate 02. The anti-peeping component 03 includes an anti-peeping layer 031 including a plurality of anti-peeping structures 0311. The plurality of anti-peeping structures 0311 are arranged in multiple columns of an array, each anti-peeping structure 0311 is provided with a first surface (marked in neither FIG. 1 nor FIG. 2) proximal to the first light guide plate 02, a second surface (marked in neither FIG. 1 nor FIG. 2) distal from the first light guide plate 02, and two third surfaces (marked in neither FIG. 1 nor FIG. 2) intersecting both the first surface and the second surface. The two third surfaces are opposite, an included angle between each third surface and the first surface is an obtuse angle, and the second surface is a free-form surface.
[0082]After being totally reflected on the backlight surface M2 of the first light guide plate 02, light emitted by the first light source 01 can sequentially pass through the light emitting surface M1 of the first light guide plate 02 and the first surface of the anti-peeping structure 0311, and is emitted into the anti-peeping structure 0311; and after being reflected on the third surface of the anti-peeping structure 0311, the light passes through the second surface of the anti-peeping structure 0311 and is emitted out from the anti-peeping component 03. In this case, the backlight module 0 is in the anti-peeping mode, and a display apparatus including the backlight module 0 implements an anti-peeping display function.
[0083]To sum up, based on the backlight module provided in this embodiment of the present disclosure, the included angle between the third surface and the first surface of the anti-peeping structure is an obtuse angle, the light emitted by the first light source passes through the first surface of the anti-peeping structure, and is emitted into the anti-peeping structure; after being reflected on the third surface of the anti-peeping structure, the light then passes through the second surface of the anti-peeping structure, and is emitted out of the anti-peeping component. Therefore, the light emitted out of the anti-peeping structure concentrates to a central region of the second surface of the anti-peeping structure, such that the light emitted out of the backlight module concentrates to a central region of a light emitting surface of the backlight module, thereby reducing a half-brightness angle and a cut-off angle of the backlight module, to implement the anti-peeping mode of the backlight module. Based on the solution provided in this embodiment of the present disclosure, the anti-peeping mode of the backlight module can be implemented without using a PDLC. Therefore, costs and power consumption of the backlight module are relatively low.
[0084]Optionally, still referring to FIG. 1 and FIG. 2, the backlight module 0 further includes: a second light source 04, a second light guide plate 05, and a dielectric layer 06. The second light source 04 is an edge-type light source of the second light guide plate 05 (in other words, the second light source 04 is disposed on a side where a side surface of the second light guide plate 05 is disposed). The second light guide plate 05 is provided with a light emitting surface G1 and a backlight surface G2 that are opposite. The light emitting surface G1 is a flat surface, the backlight surface G2 is a dot pattern surface, the second light guide plate 05 is disposed on a side, distal from the anti-peeping component 03, of the first light guide plate 02, the light emitting surface G1 of the second light guide plate 05 is proximal to the first light guide plate 02, and the backlight surface G2 of the second light guide plate 05 is distal from the first light guide plate 02. The dielectric layer 06 is disposed between the first light guide plate 02 and the second light guide plate 05, and a refractive index of the dielectric layer 06 is less than both the refractive index of the first light guide plate 02 and a refractive index of the second light guide plate 05. After being scattered by the backlight surface G2 of the second light guide plate 05, light emitted by the second light source 04 can be emitted into the dielectric layer 06, sequentially passes through the dielectric layer 06 and the first light guide plate 02, is emitted into the anti-peeping component 03, then passes through the plurality of anti-peeping structures 0311 and a region between each adjacent anti-peeping structures 0311, and is emitted out of the anti-peeping component 03. In this case, the backlight module 0 is in a sharing mode, and the display apparatus including the backlight module 0 implements a sharing display function.
[0085]In this embodiment of the present disclosure, a backlight surface and/or a light emitting surface of a light guide plate are/is flat surfaces/a flat surface means that the backlight surface and/or the light emitting surface of the light guide plate are/is not provided with dots. A backlight surface and/or a light emitting surface of a light guide plate are/is dot pattern surfaces/a dot pattern surface means that the backlight surface and/or the light emitting surface of the light guide plate are/is provided with dots. The backlight surface and/or the light emitting surface are/is usually flat surfaces/a flat surface. For example, both the light emitting surface M1 and the backlight surface M2 of the first light guide plate 02 are flat surfaces means that both the light emitting surface M1 and the backlight surface M2 of the first light guide plate 02 are not provided with dots; the backlight surface G2 of the second light guide plate 05 is a dot pattern surface means that the backlight surface G2 of the second light guide plate 05 is provided with dots, and the backlight surface G2 may be a flat surface with dots. The dots on the backlight surface G2 may be circular dots, square dots, or of course dots of another shape, which is not limited in this embodiment of the present disclosure.
[0086]Optionally, in this embodiment of the present disclosure, each anti-peeping structure 0311 is further provided with two parallel end surfaces (marked in neither FIG. 1 nor FIG. 2). In the anti-peeping structure 0311, each end surface is in contact with each of the first surface, the second surface, and the two third surfaces. Exemplarily, FIG. 3 is a schematic structural diagram of an anti-peeping structure 0311 according to an embodiment of the present disclosure, and FIG. 4 is a right view of the anti-peeping structure 0311 shown in FIG. 3. Referring to FIG. 3 and FIG. 4, the anti-peeping structure 0311 is provided with a first surface W1 and a second surface W2 that are opposite, two third surfaces W3 intersecting both the first surface W1 and the second surface W2, and two parallel end surfaces W4. The two third surface W3 are opposite, an included angle e between each of the third surfaces W3 and the first surface W1 is an obtuse angle, the first surface W1 is provided with a recess region W11 and a flat region W12, and the second surface W2 is a free-form surface. With reference to FIG. 1 to FIG. 4, the light emitted by the first light source 01 can be totally reflected on a first region (marked in none of FIG. 1 to FIG. 4) of the light emitting surface M1 of the first light guide plate 02, and the light totally reflected by the backlight surface M2 of the first light guide plate 02 can sequentially pass through a second region (marked in none of FIG. 1 to FIG. 4) of the light emitting surface M1 of the first light guide plate 02 and the flat region W12 of the anti-peeping structure 0311, and be emitted into the anti-peeping structure 0311. The second region of the light emitting surface M1 of the first light guide plate 02 is a region, corresponding to the flat region W12 of the anti-peeping structure 0311, of the light emitting surface M1 of the first light guide plate 02, and the first region of the light emitting surface M1 of the first light guide plate 02 is a region (in other words, the recess region W11 of the anti-peeping structure 0311 and a region, corresponding to the region between adjacent anti-peeping structures 0311, of the light emitting surface of the first light guide plate 02) of the light emitting surface M1 of the first light guide plate 02 except the second region. Optionally, the first surface W1 of the anti-peeping structure 0311 is a serrated surface.
[0087]In this embodiment of the present disclosure, with reference to FIG. 1 to FIG. 4, the first surface W1 of the anti-peeping structure 0311 is provided with the recess region W11 and the flat region W12, the recess region W11 may block direct contact between the anti-peeping structure 0311 and the first light guide plate 02, and the flat region W12 may enable the anti-peeping structure 0311 to directly come into contact with the first light guide plate 02. Therefore, light emitted by the first light guide plate 02 to the recess region W11 can be totally reflected in the first light guide plate 02, but cannot be emitted from the recess region W11 into the anti-peeping structure 0311, and light emitted from the first light guide plate 02 to the flat region W12 can sequentially pass through the light emitting surface M1 of the first light guide plate 02 and the flat region W12 and be emitted into the anti-peeping structure 0311, such that the flat region W12 may extract light from the light in the first light guide plate 02. Based on such a light extraction principle, a quantity of light extracted by the anti-peeping structure 0311 may be controlled by adjusting a spacing between adjacent flat regions W12, to adjust uniformity of a screen of the display apparatus. Usually, a larger area of the flat region W12 leads to a larger area of contact between the anti-peeping structure 0311 and the first light guide plate 02, a larger quantity of light extracted by the anti-peeping structure 0311, and higher brightness of the backlight module 0. In contrast, a smaller area of the flat region W12 leads to a smaller area of contact between the anti-peeping structure 0311 and the first light guide plate 02, a smaller quantity of light extracted by the anti-peeping structure 0311, and lower brightness of the backlight module 0.
[0088]Optionally, still referring to FIG. 3 and FIG. 4, the anti-peeping structure 0311 is an integrated structure formed by superposition of a step and a curved-surface solid (Neither the step nor the curved-surface solid is marked in FIG. 3 and FIG. 4. A superposition surface between the step and the curved-surface solid is shown by a dashed line in FIG. 3 and FIG. 4). The step is provided with a first bottom surface (that is, the first surface W1 in FIG. 3 and FIG. 4) and a second bottom surface (that is, the surface shown by the dashed line in FIG. 3 and FIG. 4) that are parallel to each other, two first side surfaces W41 parallel to each other, and two opposite second side surfaces (that is, the third surfaces W3 in FIG. 3 and FIG. 4). An included angle between each of the second side surfaces and the first bottom surface is an obtuse angle. The curved-surface solid is provided with two first surfaces W42 parallel to each other, and a second surface (that is, the second surface W2 in FIG. 3 and FIG. 4) and the third surface (that is, the surface shown by the dashed line in FIG. 3 and FIG. 4) that are opposite. The second surface is a free-form surface, the two first surfaces W42 and the third surface are all flat surfaces, the third surface of the curved-surface solid is superposed with the second bottom surface of the step, the second surface of the curved-surface solid intersects the two second side surfaces of the step, and the two first surfaces W42 of the curved-surface solid and the two first side surfaces W41 of the step are coplanar in one-to-one correspondence to form the two end surfaces W4 of the anti-peeping structure 0311. It is easy to know that, the first bottom surface of the step is a serrated surface, the first bottom surface of the step is the first surface W1 of the anti-peeping structure 0311, the second surface of the curved-surface solid is a free-form surface, the second surface of the curved-surface solid is the second surface W2 of the anti-peeping structure 0311, and the two second side surfaces of the step are the two third surfaces W3 of the anti-peeping structure 0311.
[0089]Optionally, FIG. 5 and FIG. 6 are respectively schematic front views of two backlight modules 0 according to embodiments of the present disclosure. Referring to FIG. 5 and FIG. 6, the anti-peeping component 03 includes an anti-peeping layer 031, the anti-peeping layer 031 includes a plurality of anti-peeping structures 0311, and the plurality of anti-peeping structures 0311 are arranged in multiple columns of an array. Optionally, as shown in FIG. 5, each of the anti-peeping structures 0311 is strip-shaped, and each column of the anti-peeping layer 031 is provided with one of the anti-peeping structure 0311. Alternatively, as shown in FIG. 6, each of the anti-peeping structure 0311 is block-shaped, and each column of the anti-peeping layer 031 is provided with a plurality of anti-peeping structures 0311. A first section of the block-shaped anti-peeping structure 0311 may be in rectangular. For example, as shown in FIG. 6, the first section of the block-shaped anti-peeping structure 0311 is in square, and the first section of the block-shaped anti-peeping structure 0311 is parallel to a layer surface of the anti-peeping layer 031.
[0090]Optionally, still referring to FIG. 1, FIG. 2, FIG. 5, and FIG. 6, the anti-peeping component 03 further includes a connection layer 032 disposed on the anti-peeping layer 031. The plurality of anti-peeping structures are inlaid in the connection layer 032.
[0091]Optionally, as shown in FIG. 1, FIG. 2, and FIG. 5, when the anti-peeping structure 0311 is strip-shaped, the connection layer 032 includes a plurality of connecting strips 0321 extending in a same direction, the plurality of connecting strips 0321 are arranged in an array, and each of the connecting strips 0321 intersecting the plurality of anti-peeping structures 0311. Exemplarily, as shown in FIG. 5, the plurality of connecting strips 0321 extend in a same direction, two ends of each of the plurality of connecting strips 0321 are collinear in one-to-one correspondence, and each of the connecting strips 0321 perpendicularly intersects the plurality of anti-peeping structures 0311. Optionally, when the anti-peeping structure 0311 is strip-shaped, and the first surface of the anti-peeping structure 0311 is provided with the recess region and the flat region, as shown in FIG. 2, an orthographic projection of each of the connecting strip 0321 on the anti-peeping layer 031 falls within recess regions of first surfaces of the plurality of anti-peeping structures 0311. In this embodiment of the present disclosure, since the connecting strip 0321 has no dimming effect and the orthographic projection of each of the connecting strip 0321 on the anti-peeping layer 031 falls within the recess regions of the first surfaces of the anti-peeping structures 0311, stray light formed by emitting light from the connecting strip 0321, which affect an anti-peeping display effect, can be avoided. In this embodiment of the present disclosure, the plurality of connecting strips 0321 intersect the plurality of anti-peeping structures 0311, such that grid spaces are formed on the anti-peeping component 03. The anti-peeping component 03 may further include a filling layer 09 (marked in FIG. 16 and FIG. 17). The filling layer 09, as shown in FIG. 16, may be disposed on a side, distal from the anti-peeping layer 031, of the connection layer 032, or as shown in FIG. 17, the filling layer 09 may be disposed on a side, distal from the connection layer 032, of the anti-peeping layer 031. The filling layer may be configured to fill the grid spaces of the anti-peeping component 03. A refractive index of the filling layer is less than the refractive index of the first light guide plate 02. The filling layer may be a film layer formed by using a material whose refractive index is less than the refractive index of the first light guide plate 02, or may be an air layer, which is not limited in this embodiment of the present disclosure.
[0092]Optionally, as shown in FIG. 6, when the anti-peeping structure 0311 is block-shaped, the connection layer 032 may be of a net structure. A shape of a mesh of the connection layer 032 may match a shape of the anti-peeping structure 0311. The plurality of anti-peeping structures 0311 are inlaid in meshes of the connection layer 032.
[0093]In this embodiment of the present disclosure, the anti-peeping structure 0311 shown in FIG. 5 and the anti-peeping structure 0311 shown in FIG. 6 are provided with a same structure, and a difference lies in that the anti-peeping structure 0311 shown in FIG. 6 is provided with a smaller length and that the anti-peeping structure 0311 shown in FIG. 5 is provided with a larger length. Therefore, from a perspective of FIG. 6, the anti-peeping structure 0311 is block-shaped. Optionally, when the anti-peeping structure 0311 is block-shaped, length directions of all anti-peeping structures 0311 in each column are parallel, and the length direction of the anti-peeping structure 0311 may be a direction perpendicular to the two end surfaces of the anti-peeping structure 0311. It is easily understood that, regardless of the anti-peeping structure 0311 shown in FIG. 5 or the anti-peeping structure 0311 shown in FIG. 6, both the structures thereof are shown in FIG. 3 and FIG. 4. In this embodiment of the present disclosure, a gap of the connection layer 032 (a distance between adjacent connecting strips 0321 or a size of a mesh) may be uniform or non-uniform, and the gap of the connection layer 032 may be set based on an anti-peeping strength requirement of the anti-peeping component 03. Usually, a smaller gap of the connection layer 032 indicates higher anti-peeping strength and a better anti-peeping effect.
[0094]Optionally, referring to FIG. 18, the anti-peeping component 03 further includes: a substrate layer 10. The anti-peeping layer 031 and the connection layer 032 are sequentially disposed on the substrate layer 10. The substrate layer 10 may be attachable on the light emitting surface M1 of the first light guide plate 02 by an optical adhesive 11, such that the anti-peeping component 03 is fixed on the light emitting surface M1 of the first light guide plate 02. Optionally, refractive indexes of the substrate layer, the optical adhesive, and the first light guide plate 02 are equal. In this way, the substrate layer and the optical adhesive may be prevented from interfering with light emitted from the first light guide plate 02 into the anti-peeping layer 031. In practice, the anti-peeping component 03 may include the anti-peeping layer 031 and the connection layer 032, but does not include the substrate layer. Correspondingly, the anti-peeping structure 0311 may be directly attachable on the light emitting surface M1 of the first light guide plate 02, so as to fix the anti-peeping component 03 on the light emitting surface M1 of the first light guide plate 02, which is not limited in this embodiment of the present disclosure.
[0095]Optionally, still referring to FIG. 1 and FIG. 2, the backlight module 0 further includes: a side reflective layer 07 disposed on a side surface of the first light guide plate 02, wherein the side reflective layer 07 is opposite to the first light source 01; and a bottom reflective layer 08 disposed on the backlight surface G2 of the second light guide plate 05. Both the side reflective layer 07 and the bottom reflective layer 08 may be implemented by sticking a reflective sheet or plating a reflective film at a corresponding location. The reflective sheet may be an enhanced specular reflector (ESR), which is not limited in this embodiment of the present disclosure.
[0096]Optionally, in this embodiment of the present disclosure, both the first light source 01 and the second light source 04 may be light emitting diode (LED) light bars, and a length direction of the first light source 01, a length direction of the second light source 04, and the length direction of the anti-peeping structure 0311 may be parallel. The length direction of the anti-peeping structure 0311 means a direction perpendicular to the two end surfaces of the anti-peeping structure 0311. The anti-peeping structure 0311 may be a prism. The first light guide plate 02, the second light guide plate 05, the anti-peeping structure 0311, and the connection layer 032 may use a same material. For example, the materials of these four may all be polymethyl methacrylate (PMMA) or polycarbonate (PC). A refractive index of the PMMA is 1.49, and a refractive index of the PC is 1.58. Optionally, materials of the anti-peeping structure 0311 and the connection layer 032 may also be an ultraviolet (UV) adhesive. The dielectric layer 06 may be a film layer manufactured by a material whose refractive index is less than the refractive index of the first light guide plate 02 and less than the refractive index of the second light guide plate 05. Alternatively, the dielectric layer 06 may be an air layer. In the case that the dielectric layer 06 is the air layer, a support structure may be disposed between the first light guide plate 02 and the second light guide plate 05 to support the first light guide plate 02 and the second light guide plate 05, to form the air layer between the first light guide plate 02 and the second light guide plate 05. Alternatively, a groove may be formed on the backlight surface M2 of the first light guide plate 02 and/or the light emitting surface G1 of the second light guide plate 05, such that a cavity is formed between the first light guide plate 02 and the second light guide plate 05 as the air layer after the second light guide plate 05 is disposed on a side, distal from the anti-peeping component 03, of the first light guide plate 02. The dielectric layer 06 is not limited in this embodiment of the present disclosure. A person skilled in the art easily understand that the structures of the backlight module 0 described in this specification are merely exemplary, and the backlight module may include more or fewer structures than those of the backlight module 0 described in this specification. For example, the backlight module may further include a structure such as a plastic frame, a diffusion sheet, a prism sheet, a protective sheet, and a light-shielding tape, which are not repeatedly described herein.
[0097]FIG. 7 is an indication diagram of propagation of light in the first light guide plate 02 and the anti-peeping structure 0311 according to an embodiment of the present disclosure. A deriving process of the second surface (the free-form surface) of the anti-peeping structure 0311 according to this embodiment of the present disclosure is illustrated below with reference to FIG. 7.
[0098]Referring to FIG. 7, assuming that light 1 and light 2 are boundary light emitted from the free-form surface of the anti-peeping structure 0311 after being reflected in the first light guide plate 02 for multiple times, with reference to FIG. 1 and FIG. 2, the light emitted from the first light guide plate 02 irradiates onto an inclined surface (in other words, the third surface of the anti-peeping structure 0311) of the anti-peeping structure 0311, and an included angle e between the third surface and the first surface of the anti-peeping structure 0311 is controlled, such that the light reflected by the third surface of the anti-peeping structure 0311 may be regular. Based on a light law, the light 1 and the light 2 may be equivalent to light that is emitted from a light source point O1, passes through the first light guide plate 02 and the anti-peeping structure 0311, and is emitted out of the free-form surface of the anti-peeping structure 0311. Similarly, light 3 and light 4 may be equivalent to light that is emitted from a light source point 02, passes through the first light guide plate 02 and the anti-peeping structure 0311, and is emitted from the free-form surface of the anti-peeping structure 0311. A refracting phenomenon of light emitted from the first light guide plate 02 into the anti-peeping structure 0311 may usually affect locations of the light source points O1 and O2, and does affect the deriving process of the free-form surface. Therefore, in the deriving process of the free-form surface, assuming that a refractive index of the anti-peeping structure 0311 and the refractive index of the first light guide plate 02 are same, the light emitted from the first light guide plate 02 into the anti-peeping structure 0311 does not deflect when being emitted into the anti-peeping structure 0311.
[0099]Assuming that coordinates of the light source point O (O1 or O2) are (0, 0), coordinates of any point P in the free-from surface of the anti-peeping structure 0311 are (x, y), the refractive index of the anti-peeping structure 0311 is n2, a refractive index of an external dielectric of the anti-peeping structure 0311 is n1, and an included angle between parallel emergent light (such as the light 1) and a vertical direction (in other words, a direction perpendicular to a plate surface of the first light guide plate 02, which is not marked in FIG. 7) is a. In this way, according to a vector rule of refracted light, and a vector relationship between incident light and emergent light, the following differential relation expression may be obtained:
[0100]Δy=n2x-n1sinax2+y2n1cosαx2+y2-n2yΔx
[0101]The above differential relation expression can represent a projection of the free-form surface in a flat surface perpendicular to the length direction of the anti-peeping structure 0311, and the projection is a free curve, Δy indicates a difference between a vertical coordinate of a point adjacent to the point P and a vertical coordinate of the point P on the free curve, and Δx indicates a difference between a horizontal coordinate of the point adjacent to the point P and a horizontal coordinate of the point P on the free curve. Based on a calculation thought of a differential method, assuming that coordinates (x0, y0) of a point on the free curve are known, it may be obtained according to the differential relation expression: xk=x0+k×Δx, and yk=y(k−1)+Δy(k−1), (k=1, 2, 3 . . . ). Referring to FIG. 7, based on an anti-peeping requirement, a smaller the above included angle a leads to a better anti-peeping effect. In the case that it is set that a is equal to 0° (degree), and coordinates of any point on the free curve are (xk, yk), sufficient coordinate points may be obtained according to xk=x0+k×Δx and yk=y(k−1)+Δy(k−1), (k=1, 2, 3 . . . ), and the free curve can be obtained by performing curve fitting on the sufficient coordinate points. A free curved surface of the anti-peeping structure 0311 can be obtained by expanding the free curve along an extension direction perpendicular to the free curve.
[0102]FIG. 8 is an operation schematic diagram of the backlight module 0 according to an embodiment of the present disclosure. An operation process of the backlight module 0 and a switching process of the backlight module 0 between an anti-peeping mode and a sharing mode provided in this embodiment of the present disclosure are described below with reference to FIG. 8.
[0103]Referring to FIG. 8, when the first light source 01 is turned on, and the second light source 04 is turned off, since the refractive index of the dielectric layer 06 is less than the refractive index of the first light guide plate 02, and the first surface of the anti-peeping structure 031 is provided with the recess region (an air layer may be formed between the recess region and the substrate layer), light R1 emitted by the first light source 01 is propagated in the first light guide plate 02 because the light R1 is reflected between the backlight surface M2 of the first light guide plate 02 and the first region of the light emitting surface M1 of the first light guide plate 02. In a process of pr