Liquid crystal display device having good image quality

• US 20060007111A1
• Filed: 06/24/2005
• Published: 01/12/2006
• Est. Priority Date: 06/29/2004
• Status: Abandoned Application

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Moon, Jeong-Min, Park, Hee-Jeong
• Application Number:
  US11/165,176
• Publication Number:
  US 20060007111A1
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

A liquid crystal display device includes a liquid crystal display panel, a light source having red, green and blue light emitting devices for supplying light to the liquid crystal display panel, the light source being divided into a plurality of regions, and a driving unit for separately driving red, green and blue light emitting devices in each region.

Claims

1. A liquid crystal display device comprising:

a liquid crystal display panel;

a light source having red, green and blue light emitting devices for supplying light to the liquid crystal display panel, the light source being divided into a plurality of regions; and

a driving unit for separately driving red, green and blue light emitting devices in each region.

2. The device of claim 1, wherein the light source is divided into 32 regions.

3. The device of claim 1, wherein the driving unit comprises:

a timing controlling unit for generating a timing signal according to a video signal; and

a pulse width modulation controlling unit for outputting driving signals to the red, green and blue light emitting devices for each region according to the timing signal inputted from the timing controlling unit.

4. The device of claim 3, wherein the driving signals supplied to the light emitting devices of each region have different duty ratios.

5. The device of claim 1, wherein the red, green and blue light emitting devices are spatially-independently driven.

6. The device of claim 1, wherein the red, green and blue light emitting devices are temporally-independently driven within a region.

7. The device of claim 1, wherein the liquid crystal display panel comprises:

a first substrate having a switching device and an electrode pattern thereon;

a second substrate having a color filter layer thereon; and

a liquid crystal layer between the first substrate and the second substrate.

8. A liquid crystal display device comprising:

a liquid crystal display panel;

a light source formed of red, green and blue light emitting devices for supplying light to the liquid crystal display panel; and

a driving unit for locally controlling brightness of red, green and blue colors by locally and independently driving red, green and blue light emitting devices of the light source.

9. The device of claim 8, wherein the light source is divided into 32 local regions.

10. The device of claim 8, wherein the driving unit comprises:

a timing controlling unit for generating a timing signal according to a video signal; and

a pulse width modulation controlling unit for outputting driving signals to the red, green and blue light emitting devices according to the timing signal inputted from the timing controlling unit.

11. The device of claim 10, wherein the driving signals supplied to the light emitting devices have different duty ratios.

12. The device of claim 8, wherein the red, green and blue light emitting devices are spatially-independently driven.

13. The device of claim 8, wherein the red, green and blue light emitting devices are temporally-independently driven.

14. The device of claim 8, wherein a first driving signal with a first duty cycle is applied to one of the red, green and blue light emitting devices and a second driving signal with a second duty cycle is applied to an adjacent light emitting device adjacent to the one of the red, green and blue light emitting devices.

15. The device of claim 8, wherein a first driving signal with a first duty cycle and a second driving signal with a second duty cycle are sequentially applied to one of the red, green and blue light emitting devices.

16. A liquid crystal display device comprising:

a liquid crystal display panel;

a light source having at least three different colors of light emitting devices for supplying light to the liquid crystal display panel;

a driving unit for locally controlling brightness of the at least three different colors of light emitting devices, the driving unit including a timing controlling unit for generating a timing signal according to a video signal; and

a pulse width modulation controlling unit for outputting driving signals to the at least three different colors of light emitting devices according to the timing signal inputted from the timing controlling unit.

17. The device of claim 16, wherein the light source is divided into 32 local regions.

18. The device of claim 16, wherein the driving signals supplied to the light emitting devices have different duty ratios.

19. The device of claim 16, wherein the at least three different colors of light emitting devices are spatially-independently driven.

20. The device of claim 16, wherein the at least three different colors of light emitting devices are temporally-independently driven.