US5359441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 20:57
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.
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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 |