Display apparatus

• US 5,172,105 A
• Filed: 12/18/1990
• Issued: 12/15/1992
• Est. Priority Date: 12/20/1989
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Tsuboyama, Akira, Inoue, Hiroshi, Katakura, Kazunori
• Primary Examiner(s): Brier, Jeffery A.
• Assistant Examiner(s): Chin, Jick
• Application Number:
  US07/629,572
• Time in Patent Office: 728 Days
• Field of Search: 340/811, 340/784, 340/805, 359/54, 359/56, 359/57, 358/236, 358/241
• US Class Current: 345/97
• CPC Class Codes: G09G 2310/0224 Details of interlacing
• CPC Class Codes: G09G 2310/04 Partial updating of the display screen
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 3/3629 using liquid crystals having memory effects, e.g. ferroelectric liquid crystals
• CPC Class Codes: G09G 3/3644 with the matrix divided into sections

Abstract

A display apparatus disposes a ferroelectric liquid crystal between a group of scanning electrodes and a group of data electrodes constituting an electrode matrix, and provides a driver that applies a scanning signal to the scanning electrodes and applies data signals to the data electrodes in synchronism with the scanning signal. The driver is controlled as to divide the scanning electrodes into a plurality of blocks each comprising a plurality of scanning electrodes and select the scanning electrodes with skipping of at least one scanning electrode apart so that starting scanning electrodes in neighboring blocks from which the skipping-selection of scanning electrodes is started in each block of the scanning electrodes have mutually different positional ranks respectively in the neighboring blocks, whereby flickering caused by either scanning drive or by repetition of black and white signals is effectively suppressed while the observability of a motion picture is retained.

Claims

1. A display apparatus, comprising:

(a) an electrode matrix comprising a group of scanning electrodes and a group of data electrodes;

(b) drive means including first means for applying a scanning signal to said scanning electrodes and second means for applying data signals to said data electrodes in synchronism with said scanning signal; and

(c) control means for controlling said drive means so as to divide said scanning electrodes into a plurality of blocks each comprising a plurality of scanning electrodes and select said scanning electrodes with skipping of at least one scanning electrode apart so that starting scanning electrodes in neighboring blocks from which the skipping-selection of scanning electrodes is started in each block of said scanning electrodes have mutually different positional ranks respectively in said neighboring blocks.

2. A display apparatus according to claim 1, wherein a liquid crystal is disposed between said scanning electrodes and said data electrodes.

3. A display apparatus according to claim 2, wherein said liquid crystal is a ferroelectric liquid crystal.

4. A display apparatus, comprising:

(a) an electrode matrix having a picture area with scanning lines and comprising a group of scanning electrodes and a group of data electrodes;

(b) drive means including first drive means for applying a scanning selection signal to said scanning electrodes and second drive means for applying data signals to said data electrodes; and

(c) control means for controlling said first drive means so as to divide said picture area into a plurality of picture sections in a scanning direction, each picture section comprising a plurality of scanning electrodes, sequentially scan-selecting a picture section and applying a scanning selection signal to said scanning electrodes in a selected picture section with skipping of a prescribed number of at least one scanning electrode apart from a starting scanning electrode in said selected picture section which has a positional rank in a certain picture section so that a starting scanning electrode from which the scanning is started in a selected certain picture section which is different from that of a starting scanning electrode in a subsequently selected picture section from which the scanning is started in the subsequently selected picture section in one vertical scanning operation, effecting a plurality of vertical scanning operations to form a whole picture, and controlling said second drive means so as to apply data signals to said data electrodes in synchronism with said scanning selection signal.

5. A display apparatus according to claim 4, wherein said starting scanning electrode in said subsequently selected picture section has a positional rank differing by +1 from that of said starting scanning electrode in said certain picture section.

6. A display apparatus according to claim 4, wherein said starting scanning electrode in said subsequently selected picture section has a positional rank differing by -1 from that of said starting scanning electrode in said certain picture section.

7. A display apparatus according to claim 4, wherein said starting scanning electrode in said subsequently selected picture section has a positional rank differing by an odd number from that of said starting scanning electrode in said certain picture section.

8. A display apparatus according to claim 4, wherein said respective picture sections have said same size.

9. A display apparatus according to claim 4, wherein the picture sections are present in a total number of 2ⁿ, wherein n is a natural number and 2ⁿ <

the total number of scanning lines.

10. A display apparatus according to claim 4, wherein said scanning selection signal is applied to an every 2n-th scanning electrode, with n=a natural number and 2ⁿ <

the number of scanning lines in an associated picture section.

11. A display apparatus according to claim 4, wherein a liquid crystal is disposed between said scanning electrodes and said data electrodes.

12. A display apparatus according to claim 11, wherein said liquid crystal is a ferroelectric liquid crystal.

13. A display apparatus according to claim 4, wherein said starting scanning electrode in said certain picture section is an n-th scanning electrode in said picture section and said starting scanning electrode in said subsequently selected picture section is an n+1-th scanning electrode in said subsequently selected picture section, wherein n is a natural number.

14. A display apparatus according to claim 4, wherein said starting scanning electrode in said certain picture section is a 2n-th scanning electrode in said picture section and said starting scanning electrode in said subsequently selected picture section is a (2n-1)th scanning electrode in said subsequently selected picture section, wherein n is a natural number.

15. A display apparatus according to claim 4, wherein said starting scanning electrode in said certain picture section is an n-th scanning electrode in the picture section and said starting scanning electrode in said subsequently selected picture section is an n+m-th scanning electrode in said subsequently selected picture section, wherein n is natural number and m is a positive odd number.

16. A display system, comprising:

(a) an electrode matrix comprising a group of scanning electrodes and a group of data electrodes;

(b) drive means including first means for applying a scanning signal to said scanning electrodes and second means for applying data signals to said data electrodes in synchronism with said scanning signal;

(c) control means for controlling said drive means so as to divide said scanning electrodes into a plurality of blocks each comprising a plurality of scanning electrodes and select said scanning electrodes with skipping of at least one scanning electrode apart so that starting scanning electrodes in neighboring blocks from which the skipping-selection of scanning electrodes is started in each block of said scanning electrodes have mutually different positional ranks respectively in said neighboring blocks; and

(d) image data control means for supplying data to said control means corresponding to given image data.

17. A display system, comprising:

(a) an electrode matrix having a picture area and comprising a group of scanning electrodes and a group of data electrodes;

(b) drive means including first drive means for applying a scanning selection signal to said scanning electrodes and second drive means for applying data signals to said data electrodes; and

(c) control means for controlling said first drive means so as to divide said picture area into a plurality of picture sections in a scanning direction, each picture section comprising a plurality of scanning electrodes, sequentially scan-selecting a picture section and applying a scanning selection signal to said scanning electrodes in a selected picture section with skipping of a prescribed number of at least one scanning electrode apart from a starting scanning electrode in said selected picture section so that a starting scanning electrode from which the scanning is started in a selected certain picture section has a positional rank in said certain picture section which is different from that of a starting scanning electrode in a subsequently selected picture section from which the scanning is started in said subsequently selected picture section in one vertical scanning operation, effecting a plurality of vertical scanning operations to form a whole picture, and controlling said second drive means so as to apply data signals to said data electrodes in synchronism with said scanning selection signal; and

(d) image data control means for supplying data to said control means corresponding to given image data.

18. A recording apparatus, comprising:

(a) an electrode matrix comprising a group of scanning electrodes and a group of data electrodes;

(b) drive means including first means for applying a scanning signal to said scanning electrodes and second means for applying data signals to said data electrodes in synchronism with said scanning signal;

(c) control means for controlling said drive means so as to divide said scanning electrodes into a plurality of blocks each comprising a plurality of scanning electrodes and select said scanning electrodes with skipping of at least one scanning electrode apart so that starting scanning electrodes in neighboring blocks from which the skipping-selection of scanning electrodes is started in each block of said scanning electrodes have mutually different positional ranks respectively in said neighboring blocks;

(d) image data control means for supplying data to said control means corresponding to given image data;

(e) a photosensitive member; and

(f) a developing device.

19. A recording apparatus, comprising:

(a) an electrode matrix having a picture area and comprising a group of scanning electrodes and a group of data electrodes;

(b) drive means including first drive means for applying a scanning selection signal to said scanning electrodes and second drive means for applying data signals to said data electrodes;

(c) control means for controlling said first drive means so as to divide said picture area into a plurality of picture sections in a scanning direction, each picture section comprising a plurality of scanning electrodes, sequentially scan-selecting a picture section and applying a scanning selection signal to said scanning electrodes in a selected picture section with skipping of a prescribed number of at least one scanning electrode apart from a starting scanning electrode in said selected picture section so that a starting scanning electrode from which the scanning is started in a selected certain picture section has a positional rank in said certain picture section which is different from that of a starting scanning electrode in a subsequently selected picture section from which the scanning is started in said subsequently selected picture section in one vertical scanning operation, effecting a plurality of vertical scanning operations to form a whole picture, and controlling said second drive means so as to apply data signals to said data electrodes in synchronism with said scanning selection signal;

(d) image data control means for supplying data to said control means corresponding to given image data;

(e) a photosensitive member; and

(f) a developing state.