US5546104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display apparatus
Assignee: Rohm Co Ltd
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Filing: 1994-11-30
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Granted: 1996-08-13
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Expires: 2014-11-30
Abstract
Abstract A memory is provided for storing one field of video signals supplied to a liquid crystal display panel serving as a display portion. Whether the video signals to be displayed have a stationary image portion or a moving image portion is determined by a comparator by comparing the video signals of the last field read out from the memory and the video signals of the present field supplied to the liquid crystal display panel. When it is determined that the video signals have a stationary image portion, the speed of scanning by a driver is reduced. When the scanning speed is low, the power required for the scanning is reduced.
Inventors
- 👤 Kaeko Kuga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:53
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/2092; G09G3/34; G09G3/36; G09G3/3611; G09G3/3648; G09G2310/00; G09G2310/02; G09G2310/0264; G09G2310/0267; G09G2320/00; G09G2320/02; G09G2320/0261; G09G2320/10; G09G2320/103; G09G2330/00; G09G2330/02; G09G2330/021; G09G2360/00; G09G2360/18; G09G3/3674
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
A display apparatus comprising: display means having dots in a matrix; driving means for scanning the display means; a memory for storing therein a video signal supplied to the display means; determining means for determining whether a present input video signal corresponds to a stationary image portion or a moving image portion by comparing an input video signal of a last field stored in the memory and the present input video signal; and controlling means for reducing a speed of scanning by the driving means to be lower than a speed of scanning of the moving image portion when it is determined by the determining means that the present video signal corresponds to the stationary image portion.
Claim 2
Dependent Claim
117 words
A display apparatus comprising: display means having dots in a matrix; driving means for scanning the display means; a memory for storing therein a video signal supplied to the display means; determining means for determining whether a present input video signal corresponds to a stationary image portion or a moving image portion by comparing an input video signal of a last field stored in the memory and the present input video signal; and controlling means for reducing a speed of scanning by the driving means to be lower than a speed of scanning of the moving image portion when it is determined by the determining means that the present video signal corresponds to the stationary image portion.
Claim 3
Dependent Claim
17 words
A display apparatus according to claim 1, wherein said display means is a liquid crystal display panel.
Claim 4
Dependent Claim
14 words
A display apparatus according to claim 1, wherein said memory is a non-volatile memory.
Claim 5
Dependent Claim
115 words
A display apparatus comprising: display means having dots in a matrix; driving means for scanning the display means; a memory for storing therein a video signal supplied to the display means; determining means for determining whether a present field is a stationary image field or a moving image field by comparing an input video signal of a last field stored in the memory and an input video signal of a present field; and controlling means for reducing a speed of scanning by the driving means to be lower than a speed of scanning of the moving image field when it is determined by the determining means that the present field is the stationary image field.
Claim 6
Dependent Claim
115 words
A display apparatus comprising: display means having dots in a matrix; driving means for scanning the display means; a memory for storing therein a video signal supplied to the display means; determining means for determining whether a present field is a stationary image field or a moving image field by comparing an input video signal of a last field stored in the memory and an input video signal of a present field; and controlling means for reducing a speed of scanning by the driving means to be lower than a speed of scanning of the moving image field when it is determined by the determining means that the present field is the stationary image field.
Claim 7
Dependent Claim
62 words
A display apparatus according to claim 4, wherein said determining means determines that the present field is a moving image field when video signals of at least a predetermined number of dots are different than the last, and determines that the present field is a stationary image field when the number of different dots is equal to or below the predetermined number.
Claim 8
Dependent Claim
24 words
A display apparatus according to claim 4, wherein said display means is a liquid crystal display panel and said memory is a non-volatile memory.
References Cited (Backward Citations)
US4469449A
Cited
US4774506A
Cited
US4860246A
Cited
US5113493A
Cited
EP0291252A2
Cited
US5025394A
Cited
JPH02249481A
Cited
JPH02249377A
Cited
EP0494610A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-13 | 2000-02-12 | 2000-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-13 | 2004-02-12 | 2004-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-13 | 2008-02-12 | 2008-08-13 | $7700.00 | Window Closed / Lapsed |