Liquid crystal display device and driving method of the same

• US 20070279362A1
• Filed: 06/04/2007
• Published: 12/06/2007
• Est. Priority Date: 06/02/2006
• Status: Abandoned Application

• Current Assignee: InnoLux Corporation
• Original Assignee: Innolux Display Corporation (InnoLux Corporation)
• Inventors: Wang, Wei
• Application Number:
  US11/810,404
• Publication Number:
  US 20070279362A1
• Time in Patent Office: Days
• US Class Current: 345/99
• CPC Class Codes: G09G 2320/0219 Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 3/2092 Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors

Abstract

An exemplary liquid crystal display device (3) includes: a liquid crystal panel (31) including a plurality of pixel units; a printed circuit board (32) including a V_com modulating circuit (321); and a timing controller (322). The timing controller includes a gray scale voltage modulating circuit (3221), the V_com modulating circuit is configured for modulating common voltage of the plurality of pixel units, and the gray scale voltage modulating circuit is configured for further modulating gray scale voltages of the plurality of pixel units. A related method for driving the liquid crystal display device is also provided.

Claims

1. A liquid crystal display device, comprising:

a liquid crystal panel comprising a plurality of pixel units; and

a printed circuit board comprising a V_com modulating circuit and a timing controller;

wherein the timing controller comprises a gray scale voltage modulating circuit, the V_com modulating circuit is configured for modulating a common voltage of the plurality of pixel units, and the gray scale voltage modulating circuit is configured for further modulating gray scale voltages of the plurality of pixel units.

2. The liquid crystal display device as claimed in claim 1, further comprising a V_com transfer pad and a flexible printed circuit board, wherein the V_com modulating circuit is electrically coupled to the V_com transfer pad via the flexible printed circuit board.

3. The liquid crystal display device as claimed in claim 1, wherein the timing controller comprises a low voltage differential signaling receiver, a data processor, and a reduced swing differential signal transmitter, which are electrically coupled in series.

4. The liquid crystal display device as claimed in claim 3, wherein the timing controller further comprises a control signal timing generator.

5. The liquid crystal display device as claimed in claim 3, wherein the gray scale voltage modulating circuit is provided in the data processor.

6. The liquid crystal display device as claimed in claim 1, wherein the pixel units of the liquid crystal panel are arranged in an array, and the array of pixel units is divided into a plurality of portions according to different feedthrough effects.

7. The liquid crystal display device as claimed in claim 6, wherein the number of pixel units in each portion of the pixel units is the same.

8. The liquid crystal display device as claimed in claim 6, wherein the number of pixel units in any two or more of the portions of the pixel units is different.

9. A method for driving a liquid crystal display device to display an image, the image having reduced or no image flicker, the method comprising:

providing a liquid crystal panel comprising an array of pixel units and a printed circuit board comprising a V_com modulating circuit and a timing controller, the timing controller comprising a gray scale voltage modulating circuit;

dividing the array of pixel units into a plurality of portions;

modulating a common voltage of the pixel units of the portions by the V_com modulating circuit;

modulating gray scale voltages of the pixel units of the portions by the gray scale voltage modulating circuit; and

displaying an image on the liquid crystal panel according to the modulated common voltage and the modulated gray scale voltages.

10. The method as claimed in claim 9, wherein the liquid crystal panel comprises a plurality of data lines, and each of the plurality of portions of the array of pixel units is strip-shaped, and is oriented parallel to the data lines.

11. The method as claimed in claim 10, wherein the V_com modulating circuit transmits a voltage signal to compensate a common voltage of a center portion of the plurality of portions, such that the center portion displays a predetermined gray level.

12. The method as claimed in claim 11, wherein the gray scale voltage modulating circuit operates as follows:

when the liquid crystal display device displays a positive frame image, the gray scale voltage modulating circuit provides progressively decreasing gray scale voltages to the pixel units of each of the portions, and provides the a predetermined gray scale voltage to the pixel units of the center portion; and

when the liquid crystal display device displays a negative frame image, the gray scale voltage modulating circuit provides progressively increasing gray scale voltages to the pixel units of each of the portions, and provides the predetermined gray scale voltage to the pixel units of the center portion.

13. The method as claimed in claim 10, wherein the number of pixel units in each portion of the pixel units is the same.

14. The method as claimed in claim 10, wherein the number of pixel units in any two or more of the portions of the pixel units is different.

15. The method as claimed in claim 10, wherein the number of portions of the pixel units is five.