Liquid crystal display driver and method thereof

• US 20050057473A1
• Filed: 07/09/2004
• Published: 03/17/2005
• Est. Priority Date: 08/27/2003
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: Chi Mei Innolux Corporation (InnoLux Corporation)
• Inventors: Hsu, Ying-Hao, Li, Wang-Yang, Shih, Ming-Chia
• Granted Patent: US 7,843,414 B2
• Time in Patent Office: Days
• US Class Current: 345/89
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2320/028 by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

A system comprises a liquid crystal display viewable from front and side view points, and comprising a plurality of pixels having corresponding original luminance values, a plurality of data lines in the display, a plurality of data drivers for driving the data lines, and an adjusted gray scale generator for adjusting gray scales of the pixels and outputting adjusted gray scales to the data drivers for driving the data lines.

Claims

1. A system comprising:

a liquid crystal display comprising a plurality of pixels having corresponding original luminance values;

a plurality of data lines in the display;

a plurality of data drivers for driving the data lines; and

an adjusted gray scale generator for adjusting gray scales of the pixels and outputting adjusted gray scales to the pixels, to result in adjusted luminance values of the pixels.

2. The system of claim 1 wherein the original luminance values of the pixels are adjusted according to the adjusted gray scales.

3. The system of claim 2 wherein the original luminance values and the adjusted luminance values of the pixels when the display is viewed from a front view point are generally the same.

4. The system of claim 1 wherein the gray scales of the pixels are between two of the adjusted gray scales corresponding to two subframe periods in a frame period.

5. The system of claim 1 wherein the data drivers generate a plurality of drive voltages corresponding to the adjusted gray scales.

6. The system of claim 1 further comprising a lookup table storing the original luminance values and the adjusted gray scales.

7. The system of claim 1 wherein the gray scales are continuously adjusted.

8. The system of claim 1 wherein the display is a multi-domain vertically aligned liquid crystal display.

9. The system of claim 1 wherein ones of the pixels having a same coloring are arranged along diagonal lines of the display.

10. The system of claim 1 further comprising a plurality of scan lines in the display and a plurality of scan drivers for driving the scan lines.

11. A method for driving a display comprising:

driving a plurality of data lines in the display;

measuring original luminance values corresponding to a plurality of pixels in the display;

adjusting gray scales of a plurality of pixels in the display; and

adjusting the original luminance values of the pixels according to the adjusted gray scales;

wherein the original luminance values and the adjusted luminance values of the pixels when the display is viewed from a front view point are generally the same.

12. The method of claim 11 wherein the gray scales of the pixels are between two of the adjusted gray scales corresponding to two subframe periods in a frame period.

13. The method of claim 11 further comprising driving the data lines with a plurality of drive voltages corresponding to the adjusted gray scales.

14. The method of claim 11 further comprising arranging one of the pixels having a same coloring along diagonal lines in the display.

15. The method of claim 11 wherein adjusting gray scales further comprises continuously adjusting the gray scales.

16. A system comprising:

a display further comprising a plurality of pixels having corresponding original luminance values;

a plurality of data lines in the display;

a plurality of scan lines in the display;

a plurality of data drivers for driving the data lines;

a plurality of scan drivers for driving the scan lines; and

an adjusted gray scale generator for adjusting gray scales of the pixels and outputting adjusted gray scales to the pixels for adjusting the original luminance values;

wherein the original luminance values of the pixels are adjusted according to the adjusted gray scales.

17. The system of claim 16 wherein the original luminance values and the adjusted luminance values of the pixels when the display is viewed from a front view point are generally the same.

18. The system of claim 16 wherein the data drivers generate a plurality of drive voltages corresponding to the adjusted gray scales.

19. The system of claim 16 further comprising a lookup table storing the original luminance values and the adjusted gray scales.

20. The system of claim 16 wherein the gray scales are continuously and dynamically adjusted.

21. A method for generating luminance for a pixel element on a display device, the method comprising:

generating an original signal corresponding to a first intensity value for the pixel element at a first frequency;

converting the original signal into two correction signals corresponding to a second intensity value and a third intensity value, respectively, at double the first frequency, wherein the first intensity value is between the second and the third intensity values; and

sequentially outputting the two correction signals to the pixel element.

22. The method of claim 21 further comprising:

driving a plurality of data lines in the display device; and

driving a plurality of scan lines in the display device.

23. The method of claim 21 further comprising providing a lookup table for storing the first intensity value, the second intensity value, and the third intensity value.

24. The method of claim 21 wherein the original signal and the correction signals with respect to a front view of the display device are generally the same.

25. A display device for generating luminance for a pixel element, the display device comprising:

a circuit for generating an original signal corresponding to a first intensity value for the pixel element at a first frequency;

a converter for converting the original signal into two correction signals corresponding to a second intensity value and a third intensity value, respectively, at double the first frequency, wherein the first intensity value is between the second and the third intensity values; and

a memory for storing and outputting the two correction signals.

26. The display device of claim 25 further comprising a lookup table for storing the first intensity value, the second intensity value, and the third intensity value.

27. The display device of claim 25 further comprising:

a plurality of data lines;

a plurality of scan lines;

a plurality of data drivers for driving the data lines; and

a plurality of scan drivers for driving the scan lines.

28. The display device of claim 25 wherein the original signal and the correction signals with respect to a front view of the display device are generally the same.

29. A display device comprising:

a plurality of pairs of pixels in rows or columns, each pair having one of a first color, a second color and a third color;

wherein two adjacent ones of the pixels in one of the rows have the same color.

30. The display device of claim 29 further comprising:

a circuit for generating an original signal corresponding to a first intensity value for the pair of pixels at a first frequency;

a converter for converting the original signal into two adjusted signals corresponding to a second intensity value and a third intensity value, respectively, wherein the first intensity value is between the second and the third intensity values; and

a memory for storing and outputting the two correction signals to the pairs of pixels.

31. A display device comprising:

a plurality of pixels in rows and columns, each having one of a first color, a second color and a third color;

wherein two diagonally adjacent ones of the pixels have the same color.