Display system for selectively designating scanning lines having moving display data thereon

• US 5,726,679 A
• Filed: 10/03/1994
• Issued: 03/10/1998
• Est. Priority Date: 11/26/1987
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Inoue, Hiroshi, Mizutome, Atsushi, Kanno, Hideo
• Primary Examiner(s): BRIER, JEFFERY A
• Application Number:
  US08/312,982
• Time in Patent Office: 1,254 Days
• Field of Search: 340/706, 340/708, 340/709, 340/710, 340/721, 340/734, 340/765, 340/784, 340/811, 359/84, 359/85, 358/230, 358/236, 345/98-100, 345/121, 345/123, 345/125
• US Class Current: 345/100
• CPC Class Codes: G09G 2310/0227 related to multiple interlacing, i.e. involving more fields than just one odd field and one even field
• CPC Class Codes: G09G 2310/04 Partial updating of the display screen
• CPC Class Codes: G09G 2310/06 Details of flat display driving waveforms
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 3/3629 using liquid crystals having memory effects, e.g. ferroelectric liquid crystals

Abstract

A display apparatus, including a plurality of pixels arranged in a plurality of rows and a plurality of columns, each pixel including a pair of oppositely disposed electrodes and a liquid crystal disposed between the electrodes, a plurality of scanning lines each commonly connecting pixels arranged in a row, and a plurality of data lines each commonly connecting pixels arranged in a column, drive means for applying a scanning signal to the scanning lines and applying data signals to the data lines in synchronism with the scanning signal, a display data storage memory for storing display data supplied from a display data input device, a control for, when display data supplied from the display data input device is moving display data, controlling the display data storage memory to store the moving display data and supply address data for designating only scanning lines corresponding to the moving display data so as to control the electrode matrix to scan only the scanning lines on which the moving display data is written.

Claims

1. A display apparatus, comprising:

(A) a display panel having a display area defined by a plurality of pixels arranged as an electrode matrix in a plurality of rows and a plurality of columns, each pixel comprising a pair of oppositely disposed electrodes and a liquid crystal disposed between the electrodes, a plurality of scanning lines each commonly connecting pixels arranged in a row, and a plurality of data lines each commonly connecting pixels arranged in a column;

(B) drive means for applying a scanning signal to the scanning lines, and for applying data signals to the date lines in synchronism with the scanning signal; and

(C) control means for, in a period of non-rewriting a display in the whole display area, refreshing the whole display area by scanning the scanning lines for the whole display area according to an interlaced scanning scheme, and, when a demand of displaying a motion picture in a window area occurs, intermitting the whole display area scanning, designating the window area by designating a limited number of scanning lines, repeatedly scanning the limited number of scanning lines according to a non-interlaced scanning mode, thereby to effect a motion picture display selectively in the window area, and interrupting the repeated scanning for the motion picture display when the number of scanning lines for the motion picture display reaches a prescribed number of scanning lines.

2. A display apparatus according to claim 1, further comprising:

a display data storage memory for storing display data supplied from a display data input device; and

flag memory means for sampling, from said display data, an address signal for designating a scanning line, for setting a flag to an address of a scanning line corresponding to data to be rewritten among said display data, and for storing the flag, wherein

the control means controls the apparatus so that, when display data supplied from the display data input device is moving display data, the display data storage memory stores the moving display data and supplies address data for designating only scanning lines corresponding to the moving display data, based on flags stored in said flag memory means, so as to control the electrode matrix to scan only the scanning lines on which the moving display data is written and, when display data supplied from the display data storage memory is non-changing image display data, the drive means is controlled so as to repeatedly scan to refresh a display area defined by the electrode matrix for displaying the non-changing image in an interlaced scanning mode wherein the scanning lines are scan-selected with a skipping of one or more scanning electrodes in one vertical scanning and the display area for displaying the non-changing image is rewritten in a plurality of the vertical scannings.

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

4. A display apparatus according to claim 1, further comprising:

a display data storage memory for storing display data supplied from a display data input device; and

flag memory means for sampling, from said display data, an address signal for designating a scanning line, for setting a flag to an address of a scanning line corresponding to data to be rewritten among said display data, and for storing the flag, wherein

the control means controls the apparatus so that, when display data supplied from the display data storage memory is static image display data or scrolling display data and image data input to the display data storage memory is cursor or mouse display mark data, address data for designating only scanning lines corresponding to the cursor or mouse display mark data is memorized, the memorized address data is transferred and the electrode matrix is controlled so as to scan only the scanning lines on which the cursor or mouse display mark data is written, based on flags stored in said flag memory means and, when display data supplied from the display data storage memory is non-changing image display data, the drive means is controlled so as to repeatedly scan to refresh a display area defined by the electrode matrix for displaying the non-changing image in an interlaced scanning mode wherein the scanning lines are scan-selected with a skipping of one or more scanning electrodes in one vertical scanning and the display area for displaying the non-changing image is rewritten in a plurality of the vertical scannings.

5. A display apparatus according to claim 4, wherein said liquid crystal is a ferroelectric liquid crystal.

6. A display apparatus according to claim 1, wherein

the control means, when display data is non-changing image display data, controls the drive means so as to repeatedly scan for refreshing the non-changing image in an interlaced scanning mode wherein the scanning electrodes are scan-selected with a skipping of one or more scanning lines in one vertical scanning and the picture area for displaying the non-changing image is rewritten in a plurality of the vertical scannings, and, when display data is changing image display data, the drive means is controlled so as to selectively scan-select only a prescribed part of the changing image for rewriting in a non-interlaced scanning mode.

7. A display apparatus according to claim 6, wherein said display panel comprises a ferroelectric liquid crystal disposed between the scanning electrodes and the data electrodes.

8. A display apparatus according to claim 6, wherein, in said interlaced scanning mode, the scanning lines are scan-selected with skipping of two or more lines apart in one vertical scanning so that mutually non-adjacent scanning electrodes are selected in at least two consecutive vertical scannings.

9. A display apparatus according to claim 8, wherein, in said interlaced scanning mode, the scanning lines are scan-selected so that mutually non-adjacent scanning electrodes are selected in any two consecutive vertical scannings.