US4673252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal color display apparatus having fixed and variable color regions
Assignee: Hitachi Ltd
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Filing: 1986-04-11
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Granted: 1987-06-16
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Expires: 2006-04-11
Abstract
Abstract A liquid crystal color display apparatus includes a liquid crystal display panel having a section with transparent electrodes provided with color filters in striped formation and another section with transparent electrodes provided with no color filters, and separate electrode drive circuits for applying a voltage to the electrodes of the former section and another voltage to the electrodes of the latter section, with the intention of achieving little difference of brightness between both sections. The color filters in striped formation are provided in the entire area including display pattern segments having the arrangment of the transparent electrodes and a background area without transparent electrodes, with the intention of equalizing the visibility of unlighted segments and the background.
Inventors
- 👤 Masaru Kugo
- 👤 Osamu Igarashi
- 👤 Kozo Katogi
- 👤 Hiroshi Ito
- 👤 Mamoru Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:39
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/13306; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133514; G09; G09G; G09G3/00; G09G3/04; G09G3/16; G09G3/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
A liquid crystal display apparatus comprising a liquid crystal display panel having segment electrodes and common electrodes interposing liquid crystal material therebetween and a liquid crystal drive circuit, said panel including a variable-color display section which is provided with color filters in a plurality of colors arranged on said segment electrodes or on said common electrode so as to produce arbitrary color in said variable-color display section through selective activation of said segment electrodes, and a fixed-color display section which is provided with a color filter placed outside of said liquid crystal display panel, wherein said liquid crystal drive circuit is operative to control said liquid crystal display panel so as to separately control said variable-color display section and said fixed-color display section.
Claim 2
Dependent Claim
123 words
A liquid crystal display apparatus comprising a liquid crystal display panel having segment electrodes and common electrodes interposing liquid crystal material therebetween and a liquid crystal drive circuit, said panel including a variable-color display section which is provided with color filters in a plurality of colors arranged on said segment electrodes or on said common electrode so as to produce arbitrary color in said variable-color display section through selective activation of said segment electrodes, and a fixed-color display section which is provided with a color filter placed outside of said liquid crystal display panel, wherein said liquid crystal drive circuit is operative to control said liquid crystal display panel so as to separately control said variable-color display section and said fixed-color display section.
Claim 3
Dependent Claim
65 words
A liquid crystal display apparatus according to claim 1, wherein said segment electrodes and said common electrodes in said liquid crystal panel are disposed in the same distance from each other in both of said variable-color display section and said fixed-color display section, and wherein said liquid crystal material is the same substance for both of said variable-color display section and said fixed-color display section.
Claim 4
Dependent Claim
33 words
A liquid crystal display apparatus according to claim 1, wherein said common electrodes in said liquid crystal display panel are provided separately for said variable-color display section and for said fixed-color display section.
Claim 5
Dependent Claim
25 words
A liquid crystal display apparatus according to claim 1, wherein said segment electrodes in said liquid crystal display panel are arranged in a striped formation.
Claim 6
Dependent Claim
24 words
A liquid crystal display apparatus according to claim 4, wherein said color filters in said variable-color display section are arranged in a striped formation.
Claim 7
Dependent Claim
34 words
A liquid crystal display apparatus according to claim 1, wherein said variable-color display section comprises display pattern segments and a background area surrounding said segments, said background area being provided with dummy color filters.
Claim 8
Dependent Claim
65 words
A liquid crystal display apparatus according to claim 6, wherein said segment electrodes and said common electrodes in said liquid crystal panel are disposed in the same distance from each other in both of said variable-color display section and said fixed-color display section, and wherein said liquid crystal material is the same substance for both of said variable-color display section and said fixed-color display section.
Claim 9
Dependent Claim
32 words
A liquid crystal display apparatus according to claim 6, wherein said common electrodes in said liquid crystal display panel are provided separately for said variable-color display section and said fixed-color display section.
Claim 10
Dependent Claim
25 words
A liquid crystal display apparatus according to claim 6, wherein said segment electrodes in said liquid crystal display panel are arranged in a striped formation.
Claim 11
Dependent Claim
24 words
A liquid crystal display apparatus according to claim 9, wherein said color filters in said variable-color display section are arranged in a striped formation.
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) | 1990-06-15 | 1990-12-15 | 1991-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-15 | 1994-12-15 | 1995-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-15 | 1998-12-15 | 1999-06-16 | $7700.00 | Window Closed / Lapsed |