IPC分类号：
F21V8/00 | G02F1/13 | G02F1/1335 | G02B6/00 | G02F1/13357
国民经济行业分类号：
C4350 | C3874 | C4090 | C3879
当前申请(专利权)人：
NOKIA MOBILE PHONES LIMITED
原始申请(专利权)人：
NOKIA MOBILE PHONES, LTD.
当前申请(专利权)人地址：
P.O. BOX 86, SF-24, SALO, FINLAND
发明人：
NEWSTEAD, ROBERT CLIFFORD | PEREGRINE, PETER MICHAEL
摘要：
An improved illuminated LCD apparatus of the type comprising a PCB (7;10) upon which are mounted a liquid crystal display (1), at least one light source (3), a light guide (2) disposed between the liquid crystal display and the substrate for distributing light from the light source over an area of the liquid crystal display, and light attenuating means (5;18,20) disposed between the light guide and the substrate and comprising a pattern of areas of differing optical reflectance for reducing the intensity of the light reaching portions of the liquid crystal display nearest to the light source. The improvement comprises the light attenuating pattern being printed directly onto the substrate, thereby improving the efficiency and accuracy with which the pattern is applied. The light attenuating pattern may include elements formed as part of the usual PCB production process.
权利要求：
What is claimed is:
1. An illuminated liquid crystal display apparatus comprising a substrate having mounted thereon:
a liquid crystal display;
at least one light source;
a light guide comprising a transparent plate-like member having front, back and side faces and being disposed between the liquid crystal display and said substrate for distributing light from said at least one light source over an area of the liquid crystal display; and
light attenuating means disposed between said light guide and said substrate and comprising a pattern of areas of differing optical reflectance for reducing the intensity of the light reaching portions of the liquid crystal display nearest to the light source;
wherein said light attenuating means includes in part a light attenuating material printed upon said substrate.
2. An illuminated liquid crystal display apparatus as claimed in claim 1, wherein said light attenuating means includes a background layer having an optical reflectance.
3. An illuminated liquid crystal display apparatus as claimed in claim 2, wherein said background layer comprises an opaque solder resist material substantially covering said substrate.
4. An illuminated liquid crystal display apparatus as claimed in claim 2, wherein said light attenuating means further includes a plated copper pad disposed on said substrate and located adjacent the position of each light source, said plated pad having an optical reflectance less than that of the background layer.
5. An illuminated liquid crystal display apparatus as claimed in claim 2 wherein said light attenuating means includes at least a second layer printed on top of said first layer to define areas of differing optical reflectance.
6. An illuminated liquid crystal display apparatus as claimed in claim 2, wherein said light attenuating means further includes a plated copper pad disposed on said substrate and located adjacent the position of each light source said plated pad having an optical reflectance less than that of the background layer and wherein a second layer is printed on top of said copper pad and on top of part of said background layer adjacent said pad.
7. An illuminated liquid crystal display apparatus as claimed in claim 5 wherein said second layer comprises a pattern of dots.
8. A method of providing light attenuating means in an illuminated liquid crystal display apparatus, said liquid crystal display apparatus comprising:
a substrate having mounted thereon a liquid crystal display; at least one light source; a light guide comprising a transparent plate-like member having front, back and side faces and being disposed between the liquid crystal display and said substrate for distributing light from said at least one light source over an area of the liquid crystal display; and light attenuating means disposed between said light guide and said substrate and comprising a pattern of areas of differing optical reflectance for reducing the intensity of the light reaching portions of the liquid crystal display nearest to the light source;
wherein said light attenuating means includes a portion formed by printing a light attenuating material upon said substrate.
9. A method as claimed in claim 8, including the step of printing a first background layer on said substrate.
10. A method as claimed in claim 9, wherein said background layer comprises an opaque solder resist material substantially covering said substrate.
11. A method as claimed in claim 9, further including the step of forming a plated copper pad on said substrate at a location adjacent the position of each light source on the substrate, said pad having an optical reflectance less than that of the background layer.
12. A method as claimed in claim 9, further including the step of printing at least a second layer on top of said background layer after said first background layer is printed to define areas of differing optical reflectance.
13. A method as claimed in claim 12 including the step of forming a plated copper pad on said substrate as part of said first background layer at a location adjacent the position of each light source on the substrate, said pad having an optical reflectance less than that of the background layer and wherein said second layer is printed on top of said copper pad and on top of part of said background layer adjacent said pad.
14. An illuminated liquid crystal display apparatus as claimed in claim 12 wherein said second layer comprises a pattern of dots.