# US 5,353,137 A · Liquid crystal apparatus

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,353,137 A
- Document ID: US5353137A
- Status: Granted
- Kind: A
- Application number: 08/183,902
- Filed: 1994-01-21
- Granted: 1994-10-04
- Earliest claimed: 1988-07-14
- Assignees: Canon Kabushiki Kaisha
- Inventors: Akira Tsuboyama; Akiko Ooki; Hiroshi Inoue
- Web page: https://patentgrep.com/patent/US5353137A

## CPC

- G09G 3/3629: {using liquid crystals having memory effects, e.g. ferroelectric liquid crystals}
- G09G 3/36: using liquid crystals
- G09G 3/3685: {Details of drivers for data electrodes}
- G09G 2310/0227: related to multiple interlacing, i.e. involving more fields than just one odd field and one even field
- G09G 2310/0232: Special driving of display border areas
- G09G 2310/06: Details of flat display driving waveforms
- G09G 2310/061: for resetting or blanking
- G09G 2310/065: Waveforms comprising zero voltage phase or pause
- G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

A liquid crystal apparatus includes: a liquid crystal device comprising a group of first electrodes, a group of second electrodes intersecting the first electrodes, and a ferroelectric liquid crystal disposed between the group of first electrodes and the group of second electrodes so as to form a picture area comprising a pixel at each intersection of the first and second electrodes; and drive means for applying a scanning selection signal to the first electrodes N electrodes apart (N: a positive integer), and applying data signals through the second electrodes to all or a prescribed part of the pixels on a particular first electrode under application of the scanning selection signal so as to first form a dark state at said all or a prescribed part of the pixels on the particular first electrode and then form a bright state at a selected pixel among said all or a prescribed part of the pixels on the particular first electrode.

## Claims

### Claim 1

A liquid crystal apparatus, comprising:
a) a liquid crystal device comprising a group of first electrodes, a group of second electrodes intersecting the first electrodes, and a ferroelectric liquid crystal disposed between the group of first electrodes and the group of second electrodes so as to form a pixel at each intersection of the first and second electrodes;
b) first means for sequentially applying a scanning selection signal to the first electrodes;
c) second means for simultaneously applying data signals to the second electrodes in synchronism with the scanning selection signal; and
d) third means for controlling the data signals so that a prescribed number of rightmost or leftmost second electrodes is designated among the group of second electrodes to form a marginal region, and other second electrodes among the group of second electrodes are designated to form a display region which forms pixels in a bright state or dark state when supplied with data signals, and said electrodes in the marginal region are supplied with data signals so as to first form a dark state and then form a bright state at the pixels on a particular first electrode under application of the scanning selection signal, thereby (i) forming a bright state in the marginal region including all the pixels formed at the intersections of the first electrodes and the designated prescribed number of second electrodes and (ii) forming a desired display state in the display region including pixels in the bright or dark state depending on given display data signals after the completion of one cycle of scanning of the first electrodes, wherein the bright state at a pixel in the marginal region is identical to the bright state at a pixel in the display region and wherein said data signals applied to the second electrodes in the marginal region include a pulse for forming said bright state in said marginal region, wherein said pulse has a pulse width which is larger than a maximum pulse width of the data signals applied to the second electrodes in the display region.

### Claim 2 (depends on 1)

An apparatus according to claim 1, where said third means includes means for designating said prescribed number of rightmost or leftmost second electrodes.

### Claim 3 (depends on 1)

An apparatus according to claim 1, wherein said group of second electrodes includes a rightmost or leftmost wider second electrode which has a larger width than other second electrodes.

### Claim 4 (depends on 3)

An apparatus according to claim 3, wherein said group of second electrodes includes both a rightmost and a leftmost wider second electrode.