US4649381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal panel display device
Assignee: Hitachi Ltd
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Filing: 1984-10-25
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Granted: 1987-03-10
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Expires: 2004-10-25
Abstract
Abstract A liquid crystal panel device comprises a liquid crystal panel having a relatively large area particularly while in use with an automobile dashboard and having a plurality of display sections, a diffusion plate disposed opposing the rear face of the liquid crystal panel for diffusing receiving light rays, a printed circuit board disposed opposing the rear face of the diffusion plate, and a plurality of light emitting members disposed in equally spaced relation to each other on the printed circuit board over the whole region of the liquid crystal panel. A reflection plate is provided between the diffusion plate and the board, and a partition plate corresponding to the display section of the liquid crystal panel is provided. Within a space defined by the diffusion plate, board, reflection plate, and partition plate, the light emitting members consisting of three or four incandescent lamps are disposed.
Inventors
- 👤 Mitsuhiro Masuda
- 👤 Osamu Igarashi
- 👤 Keiichi Tokuyama
- 👤 Kozo Katogi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:26
CPC Classifications
G; G02; G02B; G02B1/00; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133602; G02F1/133604; G02F1/133608; G09; G09F; G09F9/00; G09F9/30; G09F9/35; H; H05; H05K; H05K3/00; H05K3/30; H05K3/301; G02F1/133606
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
193 words
A liquid crystal panel display device comprising: a liquid crystal panel having a relatively large area and having at least two display blocks, said liquid crystal panel having a front face and a rear face; a diffusion plate having a front face disposed opposing the rear face of said liquid crystal panel for diffusing received light rays, said diffusion plate having a rear face; a board disposed opposing the rear face of said diffusion plate; a reflection plate disposed between said diffusion plate and said board for partitioning spaces corresponding to respective ones of said at least two display blocks of said liquid crystal panel; and a plurality of light emitting members disposed in equally spaced relation to each other on said board over the whole region of said liquid crystal panel, at least three of said light emitting members being disposed side by side in equally spaced relationship to each other within a space partitioned by said partitioning reflection plate, said at least three light emitting members extending perpendicularly to a longitudinal direction of the space partitioned by said partitioning reflection plate, each of said light emitting members comprising an incandescent lamp.
Claim 2
Dependent Claim
193 words
A liquid crystal panel display device comprising: a liquid crystal panel having a relatively large area and having at least two display blocks, said liquid crystal panel having a front face and a rear face; a diffusion plate having a front face disposed opposing the rear face of said liquid crystal panel for diffusing received light rays, said diffusion plate having a rear face; a board disposed opposing the rear face of said diffusion plate; a reflection plate disposed between said diffusion plate and said board for partitioning spaces corresponding to respective ones of said at least two display blocks of said liquid crystal panel; and a plurality of light emitting members disposed in equally spaced relation to each other on said board over the whole region of said liquid crystal panel, at least three of said light emitting members being disposed side by side in equally spaced relationship to each other within a space partitioned by said partitioning reflection plate, said at least three light emitting members extending perpendicularly to a longitudinal direction of the space partitioned by said partitioning reflection plate, each of said light emitting members comprising an incandescent lamp.
Claim 3
Dependent Claim
43 words
A liquid crystal panel display device according to claim 1, wherein said at least three incandescent lamps are disposed perpendicularly to the longitudinal direction of each space partitioned by said partitioning reflection plate corresponding to each of said at least two display blocks.
Claim 4
Dependent Claim
49 words
A liquid crystal panel display device according to claim 1, wherein each of said at least two display blocks displays a different driving condition for a vehicle, said liquid crystal panel being a transmission type panel, and said display device being mountable on an instrument panel of the vehicle.
Claim 5
Dependent Claim
31 words
A liquid crystal panel display device according to claim 1, wherein said board comprises a printed circuit board, one of the surfaces thereof opposing said liquid crystal panel being colored white.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |