US5453855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display device backlit by LED's coupled to printed circuit board
Assignee: Koito Manufacturing Co Ltd
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Filing: 1993-12-09
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Granted: 1995-09-26
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Expires: 2013-12-09
Abstract
Abstract A liquid crystal display device with an illuminator installed in the back of a liquid crystal display panel. The illuminator is made of a shallow box-form holder having a reflective inner surface, a plurality of LED's installed in at least one side wall of the holder, a light-diffusing plate installed between the liquid crystal display panel and the holder, and a printed circuit board mounted on the outer surface of the bottom of the holder. The LED's are of different light directional angles and inclined toward the bottom surface of the holder so that the light from the LED's can be reflected by the reflective bottom surface towards the display panel.
Inventors
- 👤 Yasuo Nakamura
- 👤 Etsuo Furuya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:54
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133602; G02F1/133603; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0033; G02B6/005; G02B6/0051; G02B6/0066; G02B6/0068; G02B6/0073; G02F1/133605; G02F1/133608; G02F1/133615; G02F1/133621; G02B6/0035; G02B6/0045; G02B6/0046; G02B6/0081; G02B6/0083; G02F1/133626; G09; G09F; G09F13/00; G09F13/18; G09F2013/1804; G09F2013/1827; G09F2013/1831
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
128 words
A liquid crystal display device comprising a holder with a front surface thereof open, a liquid crystal display panel installed in said front-surface opening of said holder with a light-diffusing plate interposed between said holder and said display panel, a printed circuit board, and a plurality of LED's coupled to said printed circuit board so as to back-illuminate said liquid crystal display panel from behind said light-diffusing plate, said holder further comprising: holding parts for holding said LED's; a reflective surface formed on an inside bottom surface of said holder; and wherein said light-diffusing plate is back-illuminated by a direct light emitted from said LED's and a light reflected by said reflective surface, and said LED's are at least two types of LED's having different light directional angles.
Claim 2
Dependent Claim
128 words
A liquid crystal display device comprising a holder with a front surface thereof open, a liquid crystal display panel installed in said front-surface opening of said holder with a light-diffusing plate interposed between said holder and said display panel, a printed circuit board, and a plurality of LED's coupled to said printed circuit board so as to back-illuminate said liquid crystal display panel from behind said light-diffusing plate, said holder further comprising: holding parts for holding said LED's; a reflective surface formed on an inside bottom surface of said holder; and wherein said light-diffusing plate is back-illuminated by a direct light emitted from said LED's and a light reflected by said reflective surface, and said LED's are at least two types of LED's having different light directional angles.
Claim 3
Dependent Claim
25 words
A liquid crystal display device according to claim 1, wherein said LED's are at least two types of LED's which emit different colors of light.
Claim 4
Dependent Claim
53 words
A liquid crystal display device according to claim 2, wherein said holding parts which hold said LED's includes a plurality of through-holes which are formed through at least one side wall of said holder so that respective axial lines of said through-holes are inclined toward said light-diffusing plate or toward said reflective surface.
Claim 5
Dependent Claim
32 words
A liquid crystal display device according to claim 2, wherein a hill-shaped raised portion which has said reflective surface is provided in a center of said inside bottom surface of said holder.
Claim 6
Dependent Claim
53 words
A liquid crystal display device according to claim 1, wherein said holding parts which hold said LED's include a plurality of through-holes which are formed through at least one side wall of said holder so that respective axial lines of said through-holes are inclined toward said light-diffusing plate or toward said reflective surface.
Claim 7
Dependent Claim
32 words
A liquid crystal display device according to claim 5, wherein a hill-shaped raised portion which has said reflective surface is provided in a center of said inside bottom surface of said holder.
Claim 8
Dependent Claim
32 words
A liquid crystal display device according to claim 1, wherein a hill-shaped raised portion which has said reflective surface is provided in a center of said inside bottom surface of said holder.
Claim 9
Dependent Claim
149 words
A liquid crystal display device comprising a holder with a front-surface thereof open, a liquid crystal display panel installed in said front-surface opening of said holder with a light-diffusing plate interposed between said holder and said display panel, a printed circuit board, a plurality of LED's coupled to said printed circuit board so as to back illuminate said liquid crystal display panel from behind said light-diffusing plate, said holder further comprising: holding parts for holding said LED's; a reflective surface formed on an inside bottom surface of said holder; a hill-shaped raised portion which has said reflective surface provided at a center of said inside bottom surface of said holder; and wherein said-light-diffusing plate is back illuminated by a direct light emitted from said LED's and a light reflective by said reflected surface, and said LED's are at least two types of LED's which emit different colors of light.
Claim 10
Dependent Claim
149 words
A liquid crystal display device comprising a holder with a front-surface thereof open, a liquid crystal display panel installed in said front-surface opening of said holder with a light-diffusing plate interposed between said holder and said display panel, a printed circuit board, a plurality of LED's coupled to said printed circuit board so as to back illuminate said liquid crystal display panel from behind said light-diffusing plate, said holder further comprising: holding parts for holding said LED's; a reflective surface formed on an inside bottom surface of said holder; a hill-shaped raised portion which has said reflective surface provided at a center of said inside bottom surface of said holder; and wherein said-light-diffusing plate is back illuminated by a direct light emitted from said LED's and a light reflective by said reflected surface, and said LED's are at least two types of LED's which emit different colors of light.
Claim 11
Dependent Claim
181 words
A liquid crystal display device comprising a holder with a front-surface thereof open, a liquid crystal display panel installed in said front-surface opening of said holder with a light-diffusing plate interposed between said holder and said display panel, a printed circuit board, a plurality of LED's coupled to said printed circuit board so as to back illuminate said liquid crystal display panel from behind said light diffusing plate, said holder further comprising: holder parts for holding said LED's; a reflective surface formed on an inside bottom surface of said holder; a hill-shaped raised portion which has said reflective surfaces provided in a center of said inside bottom surface of said holder; and wherein said light-diffusing plate is back illuminated by a direct light emitted from said LED's and a light reflected by said reflective surface, and said holder parts which hold said LED's include a plurality of through holes which are formed at least in one side wall of said holder so that respective axial lines of said through holes are inclined toward said light-diffusing plate or toward said reflective surface.
Claim 12
Dependent Claim
181 words
A liquid crystal display device comprising a holder with a front-surface thereof open, a liquid crystal display panel installed in said front-surface opening of said holder with a light-diffusing plate interposed between said holder and said display panel, a printed circuit board, a plurality of LED's coupled to said printed circuit board so as to back illuminate said liquid crystal display panel from behind said light diffusing plate, said holder further comprising: holder parts for holding said LED's; a reflective surface formed on an inside bottom surface of said holder; a hill-shaped raised portion which has said reflective surfaces provided in a center of said inside bottom surface of said holder; and wherein said light-diffusing plate is back illuminated by a direct light emitted from said LED's and a light reflected by said reflective surface, and said holder parts which hold said LED's include a plurality of through holes which are formed at least in one side wall of said holder so that respective axial lines of said through holes are inclined toward said light-diffusing plate or toward said reflective surface.
Claim 13
Dependent Claim
136 words
A liquid crystal display device comprising a holder with a front surface thereof open, a liquid crystal display panel installed in said front-surface opening of said holder with a light-diffusing plate interposed between said holder and said display panel, a printed circuit board, a plurality of LED's coupled to said printed circuit board so as to back illuminate said liquid crystal display panel from behind said light diffusing plate, said holder further comprising: holder parts for holding said LED's; a reflective surface formed on an inside bottom surface of said holder; a hill-shaped raised portion which has said reflective surfaces provided in a center of said inside bottom surface of said holder; and wherein said light-diffusing plate is back illuminated by a direct light emitted from said LED's and a light reflected by said reflective surface.
Claim 14
Dependent Claim
136 words
A liquid crystal display device comprising a holder with a front surface thereof open, a liquid crystal display panel installed in said front-surface opening of said holder with a light-diffusing plate interposed between said holder and said display panel, a printed circuit board, a plurality of LED's coupled to said printed circuit board so as to back illuminate said liquid crystal display panel from behind said light diffusing plate, said holder further comprising: holder parts for holding said LED's; a reflective surface formed on an inside bottom surface of said holder; a hill-shaped raised portion which has said reflective surfaces provided in a center of said inside bottom surface of said holder; and wherein said light-diffusing plate is back illuminated by a direct light emitted from said LED's and a light reflected by said reflective surface.
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) | 1998-09-25 | 1999-03-27 | 1999-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-25 | 2003-03-27 | 2003-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-25 | 2007-03-27 | 2007-09-26 | $7700.00 | Window Closed / Lapsed |