Method and device for driving an LCD to compensate for RC delay

• US 5,841,415 A
• Filed: 01/03/1996
• Issued: 11/24/1998
• Est. Priority Date: 07/28/1995
• Status: Expired due to Term

• Current Assignee: Magnachip Semiconductor Limited (Magnachip Semiconductor)
• Original Assignee: LG Semico Company Limited (SK Hynix Inc.)
• Inventors: Lee, Kwang-Ho, Kwon, Oh-Kyong
• Primary Examiner(s): NGUYEN, CHANH DUY
• Application Number:
  US08/582,262
• Time in Patent Office: 1,056 Days
• Field of Search: 345/87, 345/92, 345/89, 345/93, 345/97, 345/100, 345/103, 345/95, 345/94, 345/90, 349/33, 349/41, 349/42, 349/46, 349/54
• US Class Current: 345/90
• CPC Class Codes: G09G 2320/0223 Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors

Abstract

In a method for driving LCD, common electrodes arranged between a glass substrate having transistors and a glass substrate having color filters are divided into a plurality of segmented electrodes, different compensating voltages are applied to corresponding segmented electrodes, and an error of a pixel voltage due to a RC delay of a gate line are compensated, so as to prevent degradation of a picture quality caused due to an RC delay of a gate line.

Claims

1. A method for driving pixels in a display device comprising the steps of:

arranging a plurality of common electrodes between a first substrate having transistors and a second substrate having filters; and

applying different compensating voltages to respective ones of groups of common electrodes to compensate for variations in a respective pixel voltage due to a delay time of a gate line that is based on a distance of each of said groups to a gate driver.

2. The method according to claim 1, wherein the plurality of common electrodes are arranged perpendicularly to the gate line connected to a gate driver.

3. The method according to claim 1, wherein the compensating voltage applied to the plurality of common electrodes differs respectively according to the delay time of the gate line.

4. The method according to claim 1, wherein the delay time is an RC delay time.

5. The method according to claim 1, wherein in said compensating voltage, different voltages are applied to each of the groups in accordance with the delay time of the gate line.

6. An LCD driving device, comprising:

a plurality of transistors each connected with a corresponding gate line, wherein in said each of the transistors an error value of a video signal applied to LCD capacitors, respectively, is measured based on a difference between pulse signals applied to the transistors; and

a more than two groups of electrodes, which are divided from common electrodes connected with a corresponding one of the LCD capacitors in accordance with the measured error value, and wherein different compensating voltages are applied to each of the more than two groups of electrodes, respectively.

7. The device according to claim 6, wherein the more than two groups of electrodes, are grouped perpendicularly to the gate lines and are grouped irregularly in accordance with shapes of pixel arrays.

8. A display device, comprising:

a first driver;

a second driver;

a plurality of pixels respectively coupled to the first and second drivers using control and first electrodes; and

a plurality of common electrodes coupled to said pixels, wherein the common electrodes comprise more than two groups of common electrodes, and wherein each of the more than two groups of common electrodes receive a different compensating voltage based on a distance from the first driver.

9. The device of claim 8, wherein the more than two groups of common electrodes are irregularly divided according to shapes of pixel arrays.

10. The device of claim 8, wherein the first and second drivers are gate and data drivers, respectively.

11. The device of claim 10, wherein the common electrodes extend in a first direction substantially perpendicular to gate lines coupled to the gate driver.

12. The device of claim 8, wherein the more than two groups of common electrodes each comprise sets of adjacent common electrodes.

13. The device of claim 8, wherein the common electrodes are coupled between a first substrate including a plurality of transistors and a second substrate including a plurality of filters.