EP0420072A2
Expired / Lapsed
EP
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Liquid crystal device
Assignee: Toshiba Lighting and Technology Corp
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Filing: 1990-09-21
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Granted: —
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Expires: 2010-09-21
Abstract
Abstract A liquid crystal display comprising a liquid crystal display board (10) including a display plane constituted by transmission-type liquid crystals, a back light source device (20) including a tube-like lamp arranged in the rear of the liquid crystal display board (10) for illuminating the rear surface of the liquid crystal display board (10), and a light diffusing transmission plate (32), wherein the direction in which an angle of visibility of the liquid crystal display board (10) is wide coincides with the direction in which unevenness of the luminance in a light diffusing transmission plate in the light source device is small.
Inventors
- 👤 Masako Nakamura
- 👤 Masaharu Baba
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 00:50
CPC Classifications
G; G09; G09F; G09F9/00; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133602; G02F1/133606; G02F1/133604; G02F1/133605; G02F1/133611
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
A liquid crystal display comprising a liquid crystal display board including a display plane constituted by transmission-type liquid crystals and a back light source device (20) having a light diffusing transmission plate (32) arranged at the rear of said liquid crystal display board (10) and a tube-like lamp arranged at the near of said light-diffusing transmission plate (32) for illuminating the rear surface of said liquid crystal display board (10) through said light diffusing transmission plate (32), wherein the direction in which an angle of visibility of said liquid crystal display board (10) is wider than that in another direction coincides with said direction in which unevenness of the luminance in said light diffusing transmission plate (32) is smaller than that in another direction.
Claim 2
Dependent Claim
124 words
A liquid crystal display comprising a liquid crystal display board including a display plane constituted by transmission-type liquid crystals and a back light source device (20) having a light diffusing transmission plate (32) arranged at the rear of said liquid crystal display board (10) and a tube-like lamp arranged at the near of said light-diffusing transmission plate (32) for illuminating the rear surface of said liquid crystal display board (10) through said light diffusing transmission plate (32), wherein the direction in which an angle of visibility of said liquid crystal display board (10) is wider than that in another direction coincides with said direction in which unevenness of the luminance in said light diffusing transmission plate (32) is smaller than that in another direction.
Claim 3
Dependent Claim
40 words
A liquid crystal display according to claim 1, characterized in that the axis of said tube-like lamp extends in the direction in which the angle of visibility of said liquid crystal display board is wider than that in another direction.
Claim 4
Dependent Claim
18 words
A liquid crystal display according to claim 2, characterized in that said tube-like lamp is a fluorescent lamp.
Claim 5
Dependent Claim
53 words
A liquid crystal display according to claim 2, characterized in that said tube-like lamp is a U-shaped fluorescent lamp, the axis of the straight portions of said U-shaped fluorescent lamp extends in the direction in which the angle of visibility of said liquid crystal display board is wider than that in another direction.
Claim 6
Dependent Claim
134 words
A liquid crystal display comprising a liquid crystal display board including a display plane constituted by transmission-type liquid crystals and a back light source device (20) having a light diffusing transmission plate (32) arranged at the rear of said liquid crystal display board (10) and a tube-like lamp arranged at the near of said light-diffusing transmission plate for illuminating the rear surface of said liquid crystal display board (10) through said light diffusing transmission (32), wherein the direction in which an angle of visibility of said liquid crystal display board (10) is wider than that in the direction different by 90° from that direction coincides with said direction in which unevenness of the luminance in said light diffusing transmission plate (32) is smaller than that in the direction different by 90° from that direction.
Claim 7
Dependent Claim
134 words
A liquid crystal display comprising a liquid crystal display board including a display plane constituted by transmission-type liquid crystals and a back light source device (20) having a light diffusing transmission plate (32) arranged at the rear of said liquid crystal display board (10) and a tube-like lamp arranged at the near of said light-diffusing transmission plate for illuminating the rear surface of said liquid crystal display board (10) through said light diffusing transmission (32), wherein the direction in which an angle of visibility of said liquid crystal display board (10) is wider than that in the direction different by 90° from that direction coincides with said direction in which unevenness of the luminance in said light diffusing transmission plate (32) is smaller than that in the direction different by 90° from that direction.
References Cited (Backward Citations)
No citation records indexed.
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