Color correction liquid crystal display and method of driving same

• US 8,823,618 B2
• Filed: 06/25/2010
• Issued: 09/02/2014
• Est. Priority Date: 07/10/2001
• Status: Expired due to Term

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Lee, Seung-Woo, Kim, Jong-Seon, Kwon, Su-Hyun
• Primary Examiner(s): Liang, Regina
• Application Number:
  US12/824,126
• Publication Number:
  US 20100309234A1
• Time in Patent Office: 1,530 Days
• Field of Search: 345 87- 89, 345/601, 345/602, 345/605, 345/690, 348/671, 348/674
• US Class Current: 345/89
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 3/2055 the pattern being varied in time
• 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

Abstract

A liquid crystal display includes a liquid crystal display panel for displaying picture images, and a color correction unit. Upon receipt of raw RGB picture data corresponding to raw RGB gamma curves, the color correction unit generates corrected RGB picture data based on values over a predetermined imaginative gamma curve established in accordance with the characteristic of the liquid crystal display panel. The color correction unit stores values over corrected RGB gamma curves corresponding to the corrected picture data, and gamma-corrects the raw RGB picture data based on values over the stored corrected RGB gamma curves, thereby displaying the picture images.

Claims

1. A liquid crystal display comprising:

a liquid crystal display panel for displaying picture images and having a plurality of pixels respectively representing at least three colors; and

a color correction unit configured to receive input picture data representing respective colors;

wherein the color correction unit is configured to refer to a target gamma curve to thereby transform the input picture data of a first color having a first gray value into output picture data of the first color having a second gray value, and wherein the target gamma curve is different from a gamma curve of the first color,

wherein the transformed second gray value of the first color has the same luminance as that of a first gray value of the target gamma curve, and wherein the first gray value of the target gamma curve is substantially equal to the first gray value of the first color.

2. The liquid crystal display of claim 1, wherein the input picture data and the output picture data are represented by a plurality of bits.

3. The liquid crystal display of claim 2, wherein a bit number of the input picture data and a bit number of the output picture data are the same or different from each other.

4. The liquid crystal display of claim 3, wherein a portion of the bits of the output picture data is configured to be referred to display a picture via a frame rate control.

5. The liquid crystal display of claim 1, wherein the first color and the second color are selected from red, green, blue and other colors, and the first color and the second color are different from each other.

6. The liquid crystal display of claim 1, further comprising a look-up table, wherein the color correction unit is further configured to refer to the look-up table to transform the input picture data into the output picture data.

7. A liquid crystal display comprising:

a liquid crystal display panel for displaying picture images and having a plurality of pixels respectively representing at least three colors; and

a color correction unit configured to receive input picture data representing respective colors and having an established imaginative gamma curve;

wherein the color correction unit is configured to refer to the established imaginative gamma curve and to transform the input picture data of a first color having a first gray value into output picture data of the first color having a second gray value, the imaginative gamma curve being different from a gamma curve of the first color, and

wherein the transformed second gray value of the first color represents the same luminance as a gray value of the imaginative gamma curve, wherein the gray value of the imaginative gamma curve is substantially equal to the first gray value.

8. The liquid crystal display of claim 7, wherein the input picture data and the output picture data are represented by a plurality of bits.

9. The liquid crystal display of claim 8, wherein a bit number of the input picture data and a bit number of the output picture data are the same or different from each other.

10. The liquid crystal display of claim 9, wherein a portion of the bits of the output picture data is referred to display a picture by means of a frame rate control.

11. The liquid crystal display of claim 7, wherein the first color and the second color are selected from red, green, blue and other colors, and the first color and the second color are different.

12. The liquid crystal display of claim 7, further comprising a look-up table, wherein the color correction unit is further configured to refer to the look-up table to transform the input picture data into the output picture data.