Liquid crystal display having reduced flicker

• US 5,253,091 A
• Filed: 07/09/1991
• Issued: 10/12/1993
• Est. Priority Date: 07/09/1990
• Status: Expired due to Term

• Current Assignee: AU Optronics Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Suzuki, Hiroshi, Kimura, Shinichi, Yamaguchi, Hidefumi
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Duong, Tai V.
• Application Number:
  US07/727,199
• Time in Patent Office: 826 Days
• Field of Search: 359/54, 359/55, 359/57, 359/66, 359/84, 359/85, 359/86, 340/702, 340/703, 340/765, 340/784, 358/236
• US Class Current: 345/94
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A liquid crystal display and a method of operating the display. A plurality of row conductors and a plurality of column conductors control pixels arranged in a matrix of rows and columns. A driver circuit applies a first data signal to first column conductors and a second data signal to second column conductors. The first and second column conductors are adjacent alternate conductors in a row direction of the matrix. The polarity of the first and second data signals are opposite to each other. Pixels in a row may be connected to the same row conductor while pixels in each column are alternately connected, respectively, to one column conductor to which the first data signal is applied and to one column conductor to which the second data signal is applied. The pixels in each row may be alternately connected respectively to one of two adjacent row conductors. The polarity of the first and second data signals is held constant for a cycle time which is substantially equal to a frame time of the liquid crystal display.

Claims

1. A liquid crystal display comprising:

a plurality of row conductors;

a plurality of column conductors;

a plurality of pixels arranged in a matrix of rows and columns;

a driver means for applying a first data signal to first column conductors, and for applying a second data signal to second column conductors, said first column conductors and said second column conductors being adjacent alternate column conductors in a row direction of said matrix, polarity of said first and second data signals being opposite to each other;

pixels in a row being connected to the same row conductor; and

pixels in each column being alternately connected respectively to one column conductor to which said first data signal is applied, and to one column conductor to which said second data signal is applied, wherein the polarity of said first and second data signals are held constant for a cycle time which is substantially equal to a frame cycle of said liquid crystal display.

2. A liquid crystal display as in claim 1, wherein said pixel includes a thin film transistor and a pixel electrode connected to said thin film transistor.

3. a liquid crystal display comprising:

a plurality of row conductors;

a plurality of column conductors;

a plurality of pixels arranged in a matrix of rows and columns;

a driver means for applying a first data signal to first column conductors and for applying a second data signal to second column conductors, said first column conductors and said second column conductors being adjacent alternate column conductors in a row direction of said matrix, polarity of said first and second data signals being opposite to each other;

pixels in each row being alternately connected to one of two adjacent row conductors; and

pixels in each column being alternately connected respectively to one column conductor to which said first data signal is applied and to one column conductor to which said second data signal is applied.

4. A liquid crystal display as in claim 3, wherein the polarity of said first and second data signals are held constant for a cycle time which is substantially equal to a frame cycle of said liquid crystal display.

5. A liquid crystal display as in claim 3, wherein said pixel includes a thin film transistor and a pixel electrode connected to said thin film transistor.

6. A method for driving a liquid crystal display comprising a plurality of row conductors;

a plurality of column conductors;

a plurality of pixels arranged in a matrix of rows and columns; and

means for applying a first data signal to first of said column conductors, and for applying a second data signal to second of said column conductors, the improvement comprising;

selecting polarity of said first and second data signals to be opposite to each other, arranging said first column conductors and said second column conductors to be adjacent alternate column conductors in a row direction of said matrix, and connecting the pixels so that pixels in the same row are connected to the same row conductor; and

pixels in each column are alternately connected respectively to one first column conductor to which said first data signal is applied, and to one second column conductor to which said second data signal is applied;

the polarity of said first and second data signals being held constant for a time substantially equal to a frame cycle of said liquid crystal display.

7. A method for driving a liquid crystal display comprising a plurality of row conductors;

a plurality of column conductors;

a plurality of pixels arranged in a matrix of rows and columns; and

means for applying a first data signal to first of said column conductors and for applying a second data signal to second of said column conductors, the improvement comprising;

selecting polarity of said first and second data signals to be opposite to each other;

arranging said first column conductors and said second column conductors to be adjacent alternate column conductors in a row direction of said matrix, and connecting said pixels so that pixels in each row are alternately connected respectively to one of two adjacent row conductors; and

said pixels in each column are alternately connected respectively to one first column conductor to which said first data signal is applied and to one second column conductor to which said second data signal is applied.

8. A method as in claim 7, wherein the polarity of said first and second data signals is held constant for a time substantially identical to a frame cycle of said liquid crystal display.