Patent US5359441A successfully refreshed from Google Patents.
US5359441A
Expired / Lapsed
US
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Reflection type liquid crystal display apparatus having a reflective pixel electrode with an elongated window over a photoconductive element
Assignee: Hitachi Ltd
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Filing: 1992-12-17
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Granted: 1994-10-25
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Expires: 2012-12-17
Abstract
Abstract A reflection type liquid crystal display apparatus is provided which is capable of displaying bright images by decreasing the loss of projected light. The reflection type liquid crystal display apparatus employs a polymer dispersed liquid crystal (PDLC) panel which assures a display mode (scattering or absorption mode) which does not employ a polarizing film, unlike a conventional liquid crystal panel. It has been found that such polarizing film reduce the efficiency with which the projected light is utilized. Since such a polarizing film is not used, and since the driving circuit portion which blocks the projected light and which serves as the non-opening portion can be utilized effectively for display, brightly displayed images can be obtained.
Inventors
- 👤 Yuji Mori
- 👤 Shinichi Komura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:15
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/135; G02F1/1333; G02F1/1334; G02F1/1343; G02F1/134309; G02F1/134336; G02F1/136; G02F1/1362; G02F1/1368; G02F2203/00; G02F2203/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
A reflection type liquid crystal display apparatus having pixels disposed in the form of a matrix, said apparatus comprising: a transparent upper substrate on which a transparent belt-like signal electrode is formed in a direction of the row of the matrix; a lower substrate having, on a surface thereof which opposes the surface of said upper substrate on which said signal electrode is formed, a belt-like scanning electrode formed in a direction of the column of the matrix, an elongated photo-conductive element connected to said scanning electrode and formed at a position corresponding to each of said pixels, and a pixel electrode having an elongated window above said photo-conductive element and formed such that it covers said photo-conductive element, said pixel electrode having a surface serving as a reflection surface; and a liquid crystal filled between said upper and lower substrates.
Claim 2
Dependent Claim
141 words
A reflection type liquid crystal display apparatus having pixels disposed in the form of a matrix, said apparatus comprising: a transparent upper substrate on which a transparent belt-like signal electrode is formed in a direction of the row of the matrix; a lower substrate having, on a surface thereof which opposes the surface of said upper substrate on which said signal electrode is formed, a belt-like scanning electrode formed in a direction of the column of the matrix, an elongated photo-conductive element connected to said scanning electrode and formed at a position corresponding to each of said pixels, and a pixel electrode having an elongated window above said photo-conductive element and formed such that it covers said photo-conductive element, said pixel electrode having a surface serving as a reflection surface; and a liquid crystal filled between said upper and lower substrates.
Claim 3
Dependent Claim
39 words
A reflection type liquid crystal display apparatus according to claim 1, wherein said liquid crystal comprises a polymer dispersed liquid crystal in which liquid crystal droplets in which a dichroic pigment is mixed are dispersed in a polymer matrix.
Claim 4
Dependent Claim
29 words
A reflection type liquid crystal display apparatus according to claim 1, further comprising a transparent electrode which is provided on the elongated window portion provided in said pixel electrode.
Claim 5
Dependent Claim
20 words
A reflection type liquid crystal display apparatus according to claim 1, wherein said photo-conductive element is made of amorphous silicon.
Claim 6
Dependent Claim
19 words
A reflection type liquid crystal display apparatus according to claim 1, wherein said pixel electrode is made of aluminum.
Claim 7
Dependent Claim
140 words
A reflection type liquid crystal display apparatus having pixels disposed in the form of a matrix, said apparatus comprising: a transparent upper substrate on which a transparent belt-like signal electrode is formed in a direction of the row of the matrix; a lower substrate having, on a surface thereof which opposes the surface of said upper substrate on which said signal electrode is formed, a belt-like scanning electrode formed in a direction of the column of the matrix, an elongated photo-conductive element connected to said scanning electrode and formed at a position corresponding to each of said pixels in the form of a plane, and a pixel electrode formed on said photo-conductive element with an elongated window therein, said pixel electrode having a surface serving as a reflection surface; and a liquid crystal filled between said upper and lower substrates.
Claim 8
Dependent Claim
140 words
A reflection type liquid crystal display apparatus having pixels disposed in the form of a matrix, said apparatus comprising: a transparent upper substrate on which a transparent belt-like signal electrode is formed in a direction of the row of the matrix; a lower substrate having, on a surface thereof which opposes the surface of said upper substrate on which said signal electrode is formed, a belt-like scanning electrode formed in a direction of the column of the matrix, an elongated photo-conductive element connected to said scanning electrode and formed at a position corresponding to each of said pixels in the form of a plane, and a pixel electrode formed on said photo-conductive element with an elongated window therein, said pixel electrode having a surface serving as a reflection surface; and a liquid crystal filled between said upper and lower substrates.
Claim 9
Dependent Claim
39 words
A reflection type liquid crystal display apparatus according to claim 6, wherein said liquid crystal comprises a polymer dispersed liquid crystal in which liquid crystal droplets in which a dichroic pigment is mixed are dispersed in a polymer matrix.
Claim 10
Dependent Claim
29 words
A reflection type liquid crystal display apparatus according to claim 6, further comprising a transparent electrode which is provided in the elongated window portion provided in said pixel electrode.
Claim 11
Dependent Claim
39 words
A reflection type liquid crystal display apparatus according to claim 8, wherein said liquid crystal comprises a polymer dispersed liquid crystal in which liquid crystal droplets in which a dichroic pigment is mixed are dispersed in a polymer matrix.
References Cited (Backward Citations)
US4239346A
Cited
GB2066545A
Cited
US4652101A
Cited
US4613207A
Cited
US4917474A
Cited
US4818074A
Cited
US4999619A
Cited
US4952031A
Cited
US5150232A
Cited
US5056895A
Cited
US5216531A
Cited
US5206673A
Cited
US5196952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-24 | 1998-04-25 | 1998-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-24 | 2002-04-25 | 2002-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-24 | 2006-04-25 | 2006-10-25 | $7700.00 | Window Closed / Lapsed |