Liquid crystal display and the driving method thereof

• US 20050200580A1
• Filed: 03/11/2005
• Published: 09/15/2005
• Est. Priority Date: 03/12/2004
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: Chi Mei Optoelectronics (InnoLux Corporation)
• Inventors: Hsu, Ying-Hao, Li, Wang-Yang
• Granted Patent: US 7,439,985 B2
• Time in Patent Office: Days
• US Class Current: 345/88
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• 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 (LCD) including an LCD panel and a driving unit is provided. The LCD panel has a red pixel, a green pixel, and a blue pixel. The driving unit is applied for receiving a red data signal, a green data signal, and a blue data signal, and outputting a red voltage signal, a green voltage signal, and a blue voltage signal for driving the red pixel, the green pixel, and the blue pixel respectively. When the red data signal, the green data signal, and the blue data signal all correspond to a specific gray level, the pixel luminance of the blue pixel is lower than the pixel luminance of the red pixel as well as the pixel luminance of the green pixel.

Claims

1. A liquid crystal display (LCD), comprising:

an LCD panel comprising a red pixel, a green pixel and a blue pixel; and

a driving unit applied for receiving a red data signal, a green data signal and a blue data signal and outputting a red voltage signal, a green voltage signal and a blue voltage signal to drive the red pixel, the green pixel and the blue pixel respectively, wherein when the red data signal, the green data signal and the blue data signal all correspond to a specific gray level, the pixel luminance of the blue pixel is lower than the pixel luminance of the red pixel as well as the pixel luminance of the green pixel.

2. The LCD according to claim 1, wherein the LCD comprises a maximum gray level, the specific gray level is approximately within the range of 0.2 to 0.6 times of the maximum gray level.

3. The LCD according to claim 1, wherein the LCD comprises a maximum gray level, the specific gray level is lower than or equal to the maximum gray level.

4. The LCD according to claim 3, wherein when the red data signal, the green data signal and the blue data signal all correspond to the maximum gray level, the red voltage signal comprises a red maximum operating voltage, the green voltage signal comprises a green maximum operating voltage, and the blue voltage signal comprises a blue maximum operating voltage, wherein the blue maximum operating voltage is the minimum of the red maximum operating voltage, the green maximum operating voltage and the blue maximum operating voltage.

5. The LCD according to claim 1, wherein when the red data signal, the green data signal and the blue data signal all correspond to the specific gray level, and the pixel luminance of the red pixel is higher than the pixel luminance of the green pixel.

6. The LCD according to claim 1, wherein the LCD is a vertical alignment mode (VA mode) LCD.

7. The LCD according to claim 1, wherein when the red data signal, the green data signal and the blue data signal all correspond to the specific gray level, the pixel luminance of the blue pixel viewed from the front is lower than the pixel luminance of the red pixel viewed from the front as well as the pixel luminance of the green pixel viewed from the front.

8. A driving method of an LCD comprising an LCD panel and a driving unit, wherein the LCD panel comprises a red pixel, a green pixel and a blue pixel, while the driving method comprises the step of:

receiving a red data signal, a green signal and a blue data signal and outputting a red voltage signal, a green voltage signal and a blue voltage signal by the driving unit for driving the red pixel, the green pixel and the blue pixel respectively, wherein when the red data signal, the green data signal and the blue data signal all correspond to a specific gray level, the pixel luminance of the blue pixel is lower than the pixel luminance of the red pixel as well as the pixel luminance of the green pixel.

9. The driving method according to claim 8, wherein the LCD comprises a maximum gray level, the specific gray level is approximately within the range of 0.2 to 0.6 times of the maximum gray level.

10. The driving method according to claim 8, wherein the LCD comprises a maximum gray level, the specific gray level is lower than or equal to the maximum gray level.

11. The driving method according to claim 10, wherein when the red data signal, the green data signal and the blue data signal all correspond to the maximum gray level, the red voltage signal comprises a red maximum operating voltage, the green voltage signal comprises a green maximum operating voltage, and the blue voltage signal comprises a blue maximum operating voltage, wherein the blue maximum operating voltage is the red maximum operating voltage, the green maximum operating voltage and the blue maximum operating voltage.

12. The driving method according to claim 8, wherein when the red data signal, the green data signal and the blue data signal all correspond to the specific gray level, and the pixel luminance of the red pixel is higher than the pixel luminance of the green pixel.

13. The driving method according to claim 8, wherein the LCD is a vertical alignment mode (VA mode) LCD.

14. The driving method according to claim 8, wherein when the red data signal, the green data signal and the blue data signal all correspond to the specific gray level, the pixel luminance of the blue pixel viewed from the front is lower than the pixel luminance of the red pixel viewed from the front as well as the pixel luminance of the green pixel viewed from the front.