Display apparatus

• US 5,264,839 A
• Filed: 01/11/1993
• Issued: 11/23/1993
• Est. Priority Date: 09/25/1987
• 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): Oberley, Alvin E.
• Assistant Examiner(s): CHOW, DOON Y
• Application Number:
  US08/003,868
• Time in Patent Office: 316 Days
• Field of Search: 340/784, 340/783, 340/805, 340/811, 340/765, 358/241, 358/236, 359/54
• US Class Current: 345/98
• CPC Class Codes: G09G 2310/04 Partial updating of the display screen
• CPC Class Codes: G09G 3/3629 using liquid crystals having memory effects, e.g. ferroelectric liquid crystals

Abstract

A display apparatus includes: a) a matrix electrode structure comprising a set of plural scanning electrodes and a set of plural data electrodes intersecting with the scanning electrodes; b) a scanning electrode driver for serially applying a scanning selection signal to the scanning electrodes and a data electrode driver for applying data signals in parallel; c) an address generator for serially generating an address signal for addressing a scanning electrode to which the scanning selection signal is to be applied and image signals for directing data signals to be sent to the data electrodes to the respective data electrodes; and d) a circuit for generating a signal for directing a changeover between a transfer of the address signal to the scanning electrode driver and a transfer of the image signals to the data electrode driver. The display apparatus is particularly adapted for partial rewriting.

Claims

1. A display apparatus, comprising:

a) a matrix electrode structure comprising a set of plural scanning electrodes and a set of plural data electrodes intersecting with the scanning electrodes;

b) memory means for serially generating address signal data for designating a scanning electrode to which a scanning selection signal is to be applied and image signal data for displaying an image on the matrix electrode structure and for serially transferring the address signal data and the image signal data to a common line, whereby the address signal data is synchronized with a horizontal fly-back time in one horizontal scanning period;

c) scanning electrode drive means for serially applying the scanning selection signal to the scanning electrodes, said scanning electrode drive means comprising a latch for latching the address signal data and a decoder for selecting one of the scanning electrodes according to the address signal data latched by the latch;

d) data electrode drive means for applying to the data electrodes in parallel data signals in accordance with the image signal data, said data electrode drive means comprising a shift register receiving the image signal data;

e) means for generating a changeover signal for directing a changeover between a transfer of the address signal data and a transfer of the image signal data, respectively supplied from the common line; and

f) means for switching in accordance with the changeover signal between the transfer of the address signal data and the transfer of the image signal data such that the address signal data is transferred to the latch and the image signal data is transferred to the shift register.

2. An apparatus according to claim 1, wherein said transfer of the address signal to the scanning electrode drive means is synchronized with a horizontal scanning signal defining one horizontal scanning period.

3. An apparatus according to claim 1, wherein a liquid crystal is disposed between the intersections of the scanning electrodes and the data electrodes.

4. An apparatus according to claim 3, wherein said liquid crystal comprises a ferroelectric liquid crystal.

5. A display apparatus, comprising:

a) a matrix electrode structure comprising a set of plural scanning electrodes and a set of plural data electrodes intersecting with the scanning electrodes;

b) memory means for serially generating address signal data for designating scanning electrodes such that a scanning selection signal is applied to only scanning electrodes in a rewriting region and image signal data for displaying a rewriting image on the matrix electrode structure, and for serially transferring the address signal data and the image signal data to a common line, whereby the address signal data is synchronized with a horizontal fly-back time in one horizontal scanning period;

c) scanning electrode drive means for serially applying the scanning selection signal to the scanning electrodes, said scanning electrode drive means comprising a latch for latching the address signal data and a decoder for selecting one of the scanning electrodes according to the address signal data latched by the latch;

d) data electrode drive means for applying to the data electrodes in parallel data signals in accordance with the image signal data, said data electrode drive means comprising a shift register receiving the image signal data;

e) means for generating a changeover signal for directing a changeover between a transfer of the address signal data and a transfer of the image signal data, respectively supplied from the common line; and

f) means for switching in accordance with the changeover signal between the transfer of the address signal data and the transfer of the image signal data such that the address signal data is transferred to the latch and the image signal data is transferred to the shift register.

6. An apparatus according to claim 5, wherein said transfer of the address signal to the scanning electrode drive means is synchronized with a horizontal scanning signal defining one horizontal scanning period.

7. An apparatus according to claim 5, wherein a liquid crystal is disposed between the intersections of the scanning electrodes and the data electrodes.

8. An apparatus according to claim 7, wherein said liquid crystal comprises a ferroelectric liquid crystal.