Patent US5248965A successfully refreshed from Google Patents.
US5248965A
Expired / Lapsed
US
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Device for driving liquid crystal display including signal supply during non-display
Assignee: Sharp Corp
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Filing: 1991-10-23
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Granted: 1993-09-28
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Expires: 2011-10-23
Abstract
Abstract A device for driving a liquid crystal display device including common electrodes and segment electrodes to which scanning signals and display signals whose polarities are changed every half period of a frame signal are applied respectively. This device comprises a common electrode driving circuit, a segment electrode driving circuit, a display period control circuit for supplying the common electrode driving circuit and the segment electrode driving circuit with clock pulses, display data corresponding to an image to be displayed, and the frame signals during a display period in which an operation for displaying an image on the liquid crystal device is to be performed, and a non-display period control circuit for supplying the common electrode driving circuit and the segment electrode driving circuit with frame signals during a non-display period in which the displaying operation of an image on the liquid crystal display device is to be stopped.
Inventors
- 👤 Fukui Yoshimitsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:48
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3622; G09G2330/00; G09G2330/02; G09G2330/021
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
255 words
A device for driving a liquid crystal display which receives scanning signals and display signals whose polarities are periodically changed, said driving device comprising: a display period control circuit for outputting display period clock signals, display data corresponding to an image to be displayed and a display period frame signal during a display period in which an operation for displaying said image on said liquid crystal display device is to be performed; a non-display period control circuit for outputting a non-display period frame signal during a non-display period in which said operation is to be stopped; a common electrode driving circuit for applying, to said display, common electrode scanning signals each having a selection waveform or a non-selection waveform formed from the display period clock signals and the display period frame signal received from said display period control circuit during said display period, and applying to said display the common electrode scanning signals each having a non-selection waveform generated from the non-display period frame signal received from said non-display period control circuit during said non-display period; and a segment electrode driving circuit for applying, to said display, segment electrode display signals representing lighting or non-lighting generated from said display data and the display period frame signal received from said display period control circuit during said display period, and applying to said display the segment electrode display signals representing non-lighting generated from said non-display period frame signal received from said non-display period control circuit; said display period control circuit being turned off during said non-display period.
Claim 2
Independent Claim
255 words
A device for driving a liquid crystal display which receives scanning signals and display signals whose polarities are periodically changed, said driving device comprising: a display period control circuit for outputting display period clock signals, display data corresponding to an image to be displayed and a display period frame signal during a display period in which an operation for displaying said image on said liquid crystal display device is to be performed; a non-display period control circuit for outputting a non-display period frame signal during a non-display period in which said operation is to be stopped; a common electrode driving circuit for applying, to said display, common electrode scanning signals each having a selection waveform or a non-selection waveform formed from the display period clock signals and the display period frame signal received from said display period control circuit during said display period, and applying to said display the common electrode scanning signals each having a non-selection waveform generated from the non-display period frame signal received from said non-display period control circuit during said non-display period; and a segment electrode driving circuit for applying, to said display, segment electrode display signals representing lighting or non-lighting generated from said display data and the display period frame signal received from said display period control circuit during said display period, and applying to said display the segment electrode display signals representing non-lighting generated from said non-display period frame signal received from said non-display period control circuit; said display period control circuit being turned off during said non-display period.
Claim 3
Dependent Claim
60 words
A device according to claim 1, wherein said display period frame signal outputted from said display period control circuit and said non-display period frame signal outputted from said non-display period control circuit are inputted into an OR gate respectively, and an output of said OR gate is supplied to said common electrode driving circuit and said segment electrode driving circuit.
Claim 4
Dependent Claim
20 words
A device according to claim 1, further comprising a memory for storing image data of the image to be displayed.
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) | 1996-09-27 | 1997-03-29 | 1997-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-27 | 2001-03-29 | 2001-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-27 | 2005-03-29 | 2005-09-28 | $7700.00 | Window Closed / Lapsed |