Liquid crystal display including reactive mesogen alignment layer and a blue pixel with a decreased maximum gray level and driving method thereof

Patent metadata

Field	Value
Publication number	US-9830873-B2
Application number	US-201514747638-A
Country	US
Kind code	B2
Filing date	Jun 23, 2015
Priority date	Jan 7, 2015
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

Provided is a liquid crystal display including: a liquid crystal panel assembly including a plurality of pixels; a data driver applying data voltages to a plurality of data lines connected to the plurality of pixels; and a signal controller generating image data signals to provide the generated image data signals to the data driver, in which the plurality of pixels includes a reactive mesogen (RM) alignment layer formed on a display panel, and the signal controller generates the image data signals by adjusting the data voltage with the maximum gray applied to the blue pixel to be decreased by a predetermined level.

First claim

What is claimed is:

1. A liquid crystal display, comprising:
a liquid crystal panel assembly including a plurality of pixels,
a data driver applying data voltages to a plurality of data lines connected to the plurality of pixels; and
a signal controller generating image data signals to provide the generated image data signals to the data driver, and
the plurality of pixels including a red pixel, a green pixel, and a blue pixel, and at least one reactive mesogen (RM) alignment layer formed on a display panel, the signal controller generating the image data signals by adjusting the data voltage such that a maximum gray applied to the blue pixel is decreased by a predetermined level.

2. The liquid crystal display of claim 1 , wherein:
the signal controller generates the image data signals so that the data voltage with the decreased maximum gray applied to the blue pixel is adjusted to a high voltage during a changeable period when a ratio of luminance of blue for a y coordinate of a color coordinate of blue is changed.

3. The liquid crystal display of claim 2 , wherein:
the signal controller generates the image data signals so that the data voltages with a maximum gray applied to a red pixel and a green pixel are maintained at an original data voltage.

4. The liquid crystal display of claim 2 , wherein:
the signal controller generates the image data signals so that the data voltage with the maximum gray applied to the red pixel is adjusted to the high voltage during the changeable period.

5. The liquid crystal display of claim 2 , wherein:
the signal controller generates the image data signals so that the data voltage with the maximum gray applied to the green pixel is adjusted to the high voltage during the changeable period.

6. The liquid crystal display of claim 2 , wherein:
the maximum gray is a level of 256, and the high voltage corresponds to a gray level of 250 or less.

7. The liquid crystal display of claim 6 , wherein:
the signal controller generates the image data signals so that the data voltage with the maximum gray applied to the blue pixel is adjusted to the high voltage corresponding to a gray level of 250.

8. The liquid crystal display of claim 1 , wherein:
each of the plurality of pixels includes a pixel electrode to which the data voltage is applied and a common electrode to which a common voltage is applied to form an electric field with the pixel electrode, and
the pixel electrode includes a cross stem including a horizontal stem and a vertical stem and a branch which obliquely extends from the horizontal stem or the vertical stem.

9. The liquid crystal display of claim 8 , wherein:
the pixel electrode includes a first subpixel electrode and a second subpixel electrode.

10. The liquid crystal display of claim 9 , wherein:
when the data voltage is applied to one pixel, magnitudes of the voltage applied to the first subpixel electrode and the voltage applied to the second subpixel electrode are different from each other.

11. A driving method of a liquid crystal display including a plurality of pixels including at least one reactive mesogen (RM) alignment layer formed on a display panel, and a plurality of gate lines and a plurality of data lines connected to the plurality of pixels, the method comprising:
sequentially applying gate signals of a gate-on voltage to the plurality of gate lines; and
applying data voltages to the plurality of data lines in response to the gate signals of the gate-on voltage, and the plurality of pixels including a red pixel, a green pixel, and a blue pixel, and a data voltage with a maximum gray applied to the blue pixel is adjusted by decreasing the maximum gray by a predetermined level.

12. The driving method of claim 11 , wherein:
the data voltage with the decreased maximum gray applied to the blue pixel is adjusted to a high voltage during a changeable period when a ratio of luminance of blue for a y coordinate of a color coordinate of blue is changed.

13. The driving method of claim 12 , wherein:
the data voltages with a maximum gray applied to the red pixel and the green pixel are maintained at an original data voltage.

14. The driving method of claim 12 , wherein:
the data voltage with the maximum gray applied to the red pixel is adjusted to the high voltage during the changeable period.

15. The driving method of claim 12 , wherein:
the data voltage with the maximum gray applied to the green pixel is adjusted to the high voltage during the changeable period.

16. The liquid crystal display of claim 12 , wherein:
the maximum gray is a level of 256, and the high voltage corresponds to a gray level of 250 or less.

17. The liquid crystal display of claim 16 , wherein:
the data voltage with the maximum gray applied to the blue pixel is adjusted to the high voltage corresponding to a gray level of 250.

18. The driving method of claim 11 , wherein:
each of the plurality of pixels includes a pixel electrode to which the data voltage is applied and a common electrode to which a common voltage is applied to form an electric field with the pixel electrode, and
the pixel electrode includes a cross stem including a horizontal stem and a vertical stem and a branch which obliquely extends from the horizontal stem or the vertical stem.

19. The driving method of claim 18 , wherein:
the pixel electrode includes a first subpixel electrode and a second subpixel electrode.

20. The driving method of claim 19 , wherein:
when the data voltage is applied to one pixel, magnitudes of the voltage applied to the first subpixel electrode and the voltage applied to the second subpixel electrode are different from each other.

Assignees

• Samsung Display Co Ltd

Inventors

• Park Kyung Ho

Classifications

• A41C3/0071 Primary

  with interchangeable or detachable cups · CPC title

• G09G3/3648 Primary

  using an active matrix (G09G3/367 - G09G3/3696 take precedence) · CPC title

• G02F1/13

  based on liquid crystals, e.g. single liquid crystal display cells · CPC title

• A41C3/144

  Pads · CPC title

• G09G2320/0673

  for control of gamma adjustment, e.g. selecting another gamma curve · CPC title