EP0361981A2
Expired / Lapsed
EP
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Liquid crystal display device for display with grey levels
Assignee: Sharp Corp
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Filing: 1989-10-02
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Granted: —
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Expires: 2009-10-02
Abstract
Abstract A liquid crystal display device having an arrangement of a plurality of pixel display regions (82) each including a plurality of divided pixels (A-D), and being capable of effecting display with a large number of gray levels. Each of the divided pixels (A-D) is displayed individually and selectively with at least two gray levels. The liquid crystal device further includes pixel electrodes (31-36) for individually and selectively enabling the divided pixels (A-D), and a gray level setting circuit for controlling the sum of the areas of the enabled divided pixels (A-D), thereby setting the gray levels of the pixels. In this device, one pixel display region (82) includes n divided pixels (A-D) and if each pixel (A-D) can be displayed with m gray levels, the areas of the pixels (A-D) are set to form a geometric progression using m as a common ratio, whereby display with m n gray levels for one display region (82) can be effected with high precision.
Inventors
- 👤 Kenichi Nakagawa
- 👤 Takaji Numao
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 02:45
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1343; G02F1/134309; G02F1/134336; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3607; G09G3/3611; G09G3/3622; G09G3/3629; G09G3/364; G02F1/134345; G09G3/2007; G09G3/2074
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
149 words
A liquid crystal display device comprising a liquid crystal display panel including an arrangement of a plurality of pixel display regions (81, 82, 93), each said pixel display region (81, 82, 83) including a predetermined plural number of divided display blocks (21-24, A-H), each said divided display block (21-24, A-H) being able to be displayed individually and selectively with at least two gray levels, said liquid crystal display device comprising display drive means (11-14, 31-36, 51-56) for individually and selectively enabling said divided display blocks (21-24, A-H) in each said pixel display region (81, 82, 83), and gray level setting means (109, 110) coupled to said display drive means (11-14, 31-36, 51-56), for controlling the number of said divided display blocks (21-24, A-H) to be enabled for each said pixel display region (81, 82, 83), thereby setting a gray level for each said pixel display region (81, 82, 83).
Claim 2
Dependent Claim
149 words
A liquid crystal display device comprising a liquid crystal display panel including an arrangement of a plurality of pixel display regions (81, 82, 93), each said pixel display region (81, 82, 83) including a predetermined plural number of divided display blocks (21-24, A-H), each said divided display block (21-24, A-H) being able to be displayed individually and selectively with at least two gray levels, said liquid crystal display device comprising display drive means (11-14, 31-36, 51-56) for individually and selectively enabling said divided display blocks (21-24, A-H) in each said pixel display region (81, 82, 83), and gray level setting means (109, 110) coupled to said display drive means (11-14, 31-36, 51-56), for controlling the number of said divided display blocks (21-24, A-H) to be enabled for each said pixel display region (81, 82, 83), thereby setting a gray level for each said pixel display region (81, 82, 83).
Claim 3
Dependent Claim
129 words
A liquid crystal display device in accordance with claim 1, wherein said predetermined plural number is a predetermined first number, each said divided display block (21-24, A-H) is displayed individually and selectively with a second number of gray levels, said second number being two or more, said first number is selected such that areas of said divided display blocks (21-24, A-H) form a geometric progression using said second number as a common ratio, said gray level setting means (109, 110) controls the number of gray levels of each said divided display block (21-24, A-H) for each said pixel display region (81, 82, 83), whereby each said pixel display region (81,82, 83) is displayed with gray levels the number of which equals said second number to the first number power.
Claim 4
Dependent Claim
22 words
A liquid crystal display device in accordance with claim 2, wherein said divided display blocks (A-H) include a partial area (41-49, 61-69).
Claim 5
Dependent Claim
37 words
A liquid crystal display device in accordance with claim 3, wherein said partial areas (41-49), 61-69) included in the same one of said divided display blocks (A-H) are controlled to be always in an equal display state.
Claim 6
Dependent Claim
33 words
A liquid crystal display device in accordance with claim 4, wherein said partial areas (41-49, 61-69) included in the same one of said divided display blocks (A-H) have areas equal to each other.
Claim 7
Dependent Claim
46 words
A liquid crystal display device in accordance with claim 5, wherein said partial areas (41-49, 61-69) included in the same one of said divided display blocks (A-H) are arranged to be symmetrical to each other with respect to the center of said divided display block (A-H).
Claim 8
Dependent Claim
16 words
A liquid crystal display device in accordance with claim 6, wherein said first number is four.
Claim 9
Dependent Claim
16 words
A liquid crystal display device in accordance with claim 7, wherein said second number is two.
Claim 10
Dependent Claim
16 words
A liquid crystal display device in accordance with claim 7, wherein said second number is four.
Claim 11
Dependent Claim
16 words
A liquid crystal display device in accordance with claim 2, wherein said first number is four.
Claim 12
Dependent Claim
16 words
A liquid crystal display device in accordance with claim 10, wherein said second number is two.
Claim 13
Dependent Claim
16 words
A liquid crystal display device in accordance with claim 10, wherein said second number is four.
Claim 14
Dependent Claim
92 words
A display device comprising an array of display elements arranged in a plurality of display regions, each said display region being subdivided into a plurality of display blocks, and each said display block comprising one or more of said display elements and having a plurality of display level conditions, wherein the display blocks have different areas and wherein display control means is operable to drive said display blocks of a said display region individually and in predetermined combinations to provide for the display region as a whole a grey scale of display.
Claim 15
Dependent Claim
92 words
A display device comprising an array of display elements arranged in a plurality of display regions, each said display region being subdivided into a plurality of display blocks, and each said display block comprising one or more of said display elements and having a plurality of display level conditions, wherein the display blocks have different areas and wherein display control means is operable to drive said display blocks of a said display region individually and in predetermined combinations to provide for the display region as a whole a grey scale of display.
Claim 16
Dependent Claim
55 words
A display device according to claim 13 wherein the operation of said display control means and/or the variation in areas of the display blocks is such as to provide a said grey scale comprising a number of different level display states which is greater than the number of said display blocks in said display region.
References Cited (Backward Citations)
No citation records indexed.
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