LIQUID CRYSTAL DISPLAY AND METHOD OF DISPLAYING IMAGE THEREON

• US 20130120233A1
• Filed: 03/30/2012
• Published: 05/16/2013
• Est. Priority Date: 11/15/2011
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: JEON, Jae-Gwan, JEON, Byung Kil, YOO, Byoung Seok, JUN, Bong-Ju, PARK, Jae Hyoung
• Granted Patent: US 9,129,567 B2
• Time in Patent Office: Days
• US Class Current: 345/101
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: G09G 3/3666 with the matrix divided into sections

Abstract

A liquid crystal display includes a pixel, a memory configured to store a plurality of look-up tables, an image signal modification unit configured to obtain a modified look-up table based on a first look-up table and a second look-up table among the plurality of look-up tables and modify an input image signal based on the modified look-up table to generate a modified image signal, and a data driver configured to convert the modified image signal generated by the image signal modification unit into a data voltage and to supply the data voltage to the pixel. The liquid crystal display includes a plurality of regions. The liquid crystal display is configured to maintain temperature information of the plurality of regions, and the image signal modification unit is configured to modify the input image signal based on the temperature information.

Claims

1. A liquid crystal display, comprising:

a pixel;

a memory configured to store a plurality of look-up tables;

an image signal modification unit configured to obtain a modified look-up table based on a first look-up table and a second look-up table among the plurality of look-up tables and modify an input image signal based on the modified look-up table to generate a modified image signal; and

a data driver configured to convert the modified image signal generated by the image signal modification unit into a data voltage and to supply the data voltage to the pixel,

wherein the liquid crystal display comprises a plurality of regions, the liquid crystal display is configured to maintain temperature information of the plurality of regions, and the image signal modification unit is configured to modify the input image signal based on the temperature information.

2. The liquid crystal display of claim 1, wherein:

the image signal modification unit is configured to obtain the modified look-up table by a linear interpolation method.

3. The liquid crystal display of claim 2, wherein:

the modified look-up table is different from the plurality of look-up tables.

4. The liquid crystal display of claim 3, wherein:

the modified look-up table is calculated using Equation 1;

5. The liquid crystal display of claim 4, wherein:

the plurality of look-up tables comprise voltage values corresponding to the modified image signal based on a previous image signal and a current image signal.

6. The liquid crystal display of claim 1, wherein:

the plurality of look-up tables comprise one or more third look-up tables, a second temperature corresponding to the second look-up table is higher than a first temperature corresponding to the first look-up table, and temperatures corresponding to the one or more third look-tables are higher than the first temperature and lower than the second temperature.

7. The liquid crystal display of claim 6, wherein:

the image signal modification unit is configured to apply a linear interpolation method based on the first look-up table and the one or more third look-up tables, and apply another linear interpolation method based on the one or more third look-up tables and the second look-up table.

8. The liquid crystal display of claim 7, wherein:

the modified look-up table is different from the plurality of look-up tables.

9. The liquid crystal display of claim 8, wherein:

the modified look-up table is calculated using Equation 1;

10. The liquid crystal display of claim 9, wherein:

the plurality of look-up tables comprise values corresponding to the modified image signal based on a previous image signal and a current image signal.

11. The liquid crystal display of claim 1, wherein:

the temperature information is 3 bit or more data.

12. The liquid crystal display of claim 11, further comprising:

a temperature sensing unit configured to sense a temperature of at least one region of the plurality regions in the liquid crystal display to output the temperature information.

13. The liquid crystal display of claim 12, wherein:

the modified look-up table is different from the plurality of look-up tables.

14. The liquid crystal display of claim 13, wherein:

the modified look-up table is calculated using Equation 1;

15. The liquid crystal display of claim 14, wherein:

the plurality of look-up tables comprise voltage values corresponding to the modified image signal based on a previous image signal and a current image signal.

16. The liquid crystal display of claim 1, wherein:

the overdrive is overshoot driving or undershoot driving.

17. The liquid crystal display of claim 16, wherein:

the image signal modification unit is configured to modify a current image signal based on a previous image signal.

18. The liquid crystal display of claim 17, wherein:

the image signal modification unit is configured to modify a next image signal based on the previous image signal and the current image signal.

19. A method of displaying an image on a liquid crystal display, the liquid crystal display comprising a plurality of regions, the method comprising:

storing a plurality of look-up tables;

obtaining a modified look-up table based on a first look-up table and a second look-up table among the plurality of look-up tables;

modifying an input image signal based on the modified look-up table and temperature information of at least some regions of the liquid crystal display to generate a modified image signal; and

converting the modified image signal into a data voltage and supplying the data voltage to a pixel of the liquid crystal display.

20. The method of claim 19, wherein:

obtaining the modified look-up table comprises using a linear interpolation method.