Claims
- 1. A method of driving a liquid crystal display having j rows of display elements arranged in p columns, said j rows being sequentially clocked with row scan pulses while a video signal formed of a plurality of video frame signals is supplied to the display elements to display video information in sequentially displayed frames each defined by a said video frame signal, a full scan of said display corresponding in duration to the time of a video frame signal, comprising:
- (a) dividing said display into N equisized display portions, each having j/N rows, where N is greater than one;
- (b) providing a video frame memory for repetitively storing each said video frame signal, said video frame memory having memory portions including memory elements corresponding in number and arrangement to said display elements within said display portions;
- (c) storing frame information contained in each video frame signal in said video frame memory;
- (d) supplying one of said video frame signals to a display portion of said video display in real time; and
- (e) supplying the frame information of a preceding frame contained in said video frame memory to said display portions not receiving said video frame signal of said step d) during the time of said video frame signal supplied during step d.
- 2. The method of claim 1 wherein said video frame signal and said frame information stored in said video frame memory are applied to said video display in an interleaved fashion thereby reducing display flicker.
- 3. The method of claim 2 wherein N=2.
- 4. The method of claim 1 wherein N=2.
- 5. A method of driving a liquid crystal display having display elements arranged in rows and columns, said rows being clocked with row scan pulses while a video signal formed of a plurality of video frame signals is supplied to said columns to display video information in sequentially displayed frames each defined by a said video frame signal, comprising:
- multiplying the scan frequency f of said row scan pulses by two;
- applying said row scan pulses to two equisized display portions of the display having an equal number of rows, row scan pulses being alternately applied to each said display portion with every other row scan pulse being supplied to a next adjacent row of a said display portion;
- storing frame information contained in each said video frame signal in a video frame memory storing one half of said frame information therein and corresponding in size to a said display portion;
- supplying said video frame signal to said display in synchronism with alternate row scan pulses;
- supplying elements of said frame information stored in said video frame memory in synchronism with row scan pulses other than said alternate row scan pulses, said elements of said frame information being recalled from positions in said video frame memory corresponding to the display portions being supplied with said element;
- each of said two display portions thereby being supplied both said video frame signal and said stored frame information once during each display frame to thereby reduce display flicker.
- 6. A liquid crystal display system comprising:
- a liqud crystal display having j rows of display elements arranged in p columns;
- means for sequentially clocking said j rows of said display with row scan pulses;
- means for supplying a video signal formed of a plurality of video frame signals to the display elements to display video information in sequentially displayed frames each defined by a said video frame signal in synchronism with said row scan pulses;
- said liquid crystal display being divided into N equisized display portions each having j/N rows, where N is greater than one:
- video frame memory means for repetitively storing frame information contained in each said video frame signal and having memory portions including memory elements corresponding in number and arrangement to said display elements within said display portions;
- first means for selectively supplying one of said video frame signals to a display portion of said video display in real time; and
- second means for selectively supplying the frame information of a preceding frame contained in said video frame memory means to said display portions of said video display not receiving said video frame signal of said first means during each said video frame.
- 7. The system of claim 6 wherein said first and second means for selectively applying applies said video frame signal and said frame information stored in said video frame memory N-1 times to said display in an interleaved fashion, thereby reducing display flicker.
- 8. The system of claim 7 wherein N=2.
- 9. The system of claim 6 wherein N=2.
- 10. A liquid crystal display system comprising:
- a liquid crystal display having display elements arranged in rows and columns;
- means for clocking said rows of said display with row scan pulses;
- means for supplying a video signal formed of a plurality of video frame signals to said columns to display video information in sequentially displayed frames each defined by a said video frame signal in synchronism with said row scan pulses;
- means, responsive to said means for clocking, for multiplying the scan frequency f of said row scan pulses by two;
- means for alternately applying said row scan pulses to two equisized display portions of the display having an equal number of rows, said means for alternately applying said scan pulses to each said display portion with every other row scan pulse being supplied to a next adjacent row of a said display portion;
- display memory means for storing frame information contained in each said video frame signal, said display memory means storing one half of said frame information therein at any one time, said display memory means corresponding in size to a said display portion;
- first means for supplying said video frame signal to said display in synchronism with alternate row scan pulses;
- second means for supplying elements of said frame information stored in said video frame memory in synchronism with row scan pulses other than said alternate row scan pulses, said elements of said frame information being recalled from positions in said video frame memory means corresponding to the display portions being supplied with said element;
- each of said two display portions thereby being supplied both said video frame signal and said stored frame information once during each display frame to thereby reduce display flicker.
Priority Claims (1)
Number |
Date |
Country |
Kind |
59-113743 |
Jun 1984 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 739,851 file on May 31, 1985, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2139795 |
Nov 1984 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
739851 |
May 1985 |
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