LIQUID CRYSTAL DISPLAY AND DRIVING METHOD THEREOF

• US 20110310136A1
• Filed: 06/17/2011
• Published: 12/22/2011
• Est. Priority Date: 06/17/2010
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: IM, Sang-kyun, PARK, Ji-yong, KIM, Dong-wook, KIM, Min-jung
• Application Number:
  US13/162,994
• Publication Number:
  US 20110310136A1
• Time in Patent Office: Days
• US Class Current: 345/690
• 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 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2320/046 Dealing with screen burn-in prevention or compensation of the effects thereof
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general

Abstract

A Liquid Crystal Display (LCD) and a driving method thereof are provided. The LCD includes: a display panel part including a pixel, the pixel including a plurality of sub-pixels; a panel driver which drives the sub-pixels; a backlight part which emits a light of different colors to the display panel part; a backlight driver which provides the light of the colors corresponding to fields of a frame in sequence by sequentially driving the backlight part according to the fields; and a controller which controls the panel driver to represent a color of the pixel of the frame by selectively using one or more of the sub-pixels of the pixel. Hence, the liquid crystal stress can be drastically improved without a loss of brightness.

Claims

1. A Liquid Crystal Display (LCD) comprising:

a display panel part comprising a pixel, the pixel comprising a plurality of sub-pixels;

a panel driver which drives the plurality of sub-pixels;

a backlight part which emits light of different colors to the display panel part;

a backlight driver which provides the light of the different colors corresponding to fields of a frame in sequence by sequentially driving the backlight part according to the fields; and

a controller which controls the panel driver to represent a color of the pixel of the frame by selectively using one or more of the sub-pixels of the pixel.

2. The LCD of claim 1, wherein the controller uses a different sub-pixel combination used to represent a frame color, in every frame.

3. The LCD of claim 2, wherein the controller sequentially selects sub-pixels of pixels used to represent a color of the frame in every frame so as to cause a number of times the sub-pixels of the pixels of the display panel part are used in each frame to be equal.

4. The LCD of claim 2, wherein the controller sequentially selects sub-pixels of pixels used to represent a color of the frame in every N number of frames to cause a number of times the sub-pixels are used in the every N number of frames to be equal, where N is a natural number greater than 1.

5. The LCD of claim 1, wherein the panel driver drives an unselected sub-pixel of the sub-pixels to reduce a light transmittance of the unselected sub-pixel.

6. The LCD of claim 5, wherein the panel driver drives the unselected sub-pixel of the sub-pixels so that the unselected sub-pixel represents a gray or a black color.

7. The LCD of claim 1, wherein:

a polarity of the frame changes on a frame-by-frame basis; and

the controller selects sub-pixels of pixels used to represent a color of the frame at preset frame periods to cause a sum of a polarity of the sub-pixels in the corresponding frame period to be zero.

8. The LCD of claim 1, wherein the LCD is without color filters.

9. A Digital Information Display (DID) device comprising the LCD of claim 1.

10. A method of driving a Liquid Crystal Display (LCD), the method comprising:

providing light of different colors corresponding to fields of a frame in sequence according to the fields;

when a current frame is input, representing a color of a pixel of the LCD by selectively using one or more of sub-pixels of the pixel; and

when a next frame is input, representing a color of the pixel by selectively using one or more of the sub-pixels,

wherein a sub-pixel combination used to represent a frame color of the current frame is different from a sub-pixel combination used to represent a frame color of the next frame.

11. The method of claim 10, wherein sub-pixels of pixels used to represent each frame color are selected in sequence in every frame so as to cause a number of times the sub-pixels of the pixels are used to be equal.

12. The method of claim 10, wherein sub-pixels of pixels used to represent each frame color are selected in every N number of frames to cause a number of times the sub-pixels are used in the every N number of frames to be equal, where N is a natural number greater than 1.

13. The method of claim 10, wherein an unselected sub-pixel of the sub-pixels is driven to reduce a light transmittance of the unselected sub-pixel.

14. The method of claim 13, wherein the unselected sub-pixel of the sub-pixels is driven so that the unselected sub-pixel represents a gray or a black color.

15. The method of claim 10, wherein:

a polarity of the frame changes on a frame-by-frame basis; and

sub-pixels of pixels used to represent each frame color are selected at preset frame periods to cause a sum of a polarity of the sub-pixels in the corresponding frame period to be zero.

16. The method of claim 10, wherein the LCD does not include a color filter.

17. The method of claim 10, wherein the LCD is used in a Digital Information Display (DID) device.

19. A computer readable recording medium having recorded thereon a program executable by a computer for performing the method of claim 10.

18. A method of driving a display panel, the method comprising:

when a current frame is input, representing a color of a pixel of the display panel by selectively using one or more of sub-pixels of the pixel; and

when a next frame is input, representing a color of the pixel by selectively using one or more of the sub-pixels,

wherein a sub-pixel combination used to represent a frame color of the current frame is different from a sub-pixel combination used to represent a frame color of the next frame, and

the sub-pixels provide light of different colors corresponding to fields of each frame in sequence according to the fields.

20. A computer readable recording medium having recorded thereon a program executable by a computer for performing the method of claim 18.