Liquid crystal display device

• US 20050162584A1
• Filed: 11/09/2004
• Published: 07/28/2005
• Est. Priority Date: 01/23/2004
• Status: Active Grant

• Current Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Yamamoto, Tsunenori, Hiyama, Ikuo, Kajita, Daisuke
• Granted Patent: US 7,602,370 B2
• Time in Patent Office: Days
• US Class Current: 349/68
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/342 using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
• CPC Class Codes: G09G 3/36 using liquid crystals

Abstract

A liquid crystal display device of the present invention is configured of a liquid crystal display unit for displaying an image, a backlight unit controllable for each color that radiates light at the liquid crystal display unit, a display controller for controlling a display of the liquid crystal display unit, and an emission control circuit for controlling an emission of the each color of the backlight unit, wherein the emission control circuit performs control so that emission start timing and emission end timing in a sequential emission period of the each color of the backlight unit match in all colors.

Claims

1. A liquid crystal display device comprising:

a liquid crystal display unit for displaying an image;

a backlight unit controllable for each color that radiates light at said liquid crystal display unit;

a display controller for controlling a display of the liquid crystal display unit; and

an emission control circuit for controlling an emission of the each color of the backlight unit,

wherein said emission control circuit performs control so that emission start timing and emission end timing in a sequential emission period of the each color of the backlight unit match in all colors.

4. A liquid crystal display device according to claim 1, wherein said sequential emission period is set for each one-image display period of a liquid crystal display unit, and emission start timing and emission end timing of each color match within the one-image display period.

7. A liquid crystal display device according to claim 1, wherein emission intensity of said backlight unit controls and adjusts a length of an emission period within said sequential emission period.

11. A liquid crystal display device according to claim 1, wherein displacement of emission timing of each color within said sequential emission period is at least not more than three milli-seconds.

12. A liquid crystal display device according to claim 1, wherein displacement of emission timing of each color within said sequential emission period is at least not more than 1.6 milli-seconds.

13. A liquid crystal display device according to claim 1, wherein displacement of emission timing of each color within said sequential emission period is at least not more than one milli-second.

14. A liquid crystal display device according to claim 1, wherein said sequential emission period is repeated within a one-image display period.

15. A liquid crystal display device according to claim 14, wherein an interval of said repeated sequential emission period is not less than three milli-seconds.

16. A liquid crystal display device according to claim 14, wherein an interval of said repeated sequential emission period changes, depending on one-image write time of said liquid crystal display unit and response time of a liquid crystal material.

17. A liquid crystal display device according to claim 1, wherein an emission area of said backlight unit is divided into not less than two, and an interval of said sequential emission period differs in emission timing for each divided emission area.

2. A liquid crystal display device comprising:

a liquid crystal display unit for displaying an image;

a backlight unit controllable for each color that radiates light at said liquid crystal display unit;

a display controller for controlling a display of the liquid crystal display unit; and

an emission control circuit for controlling an emission of the each color of the backlight unit,

wherein said emission control circuit performs control so that an emission center of a sequential emission period of the each color in the backlight unit substantially matches in all colors.

5. A liquid crystal display device according to claim 2, wherein said sequential emission period is set for each one-image display period of a liquid crystal display unit, and an emission center of each color substantially matches within the one-image display period.

8. A liquid crystal display device according to claim 2, wherein an emission center of a sub-emission period of each color in said sequential emission period substantially matches.

3. A liquid crystal display device comprising:

a liquid crystal display unit for displaying an image;

a backlight unit controllable for each color that radiates light at said liquid crystal display unit;

a display controller for controlling a display of the liquid crystal display unit; and

an emission control circuit for controlling an emission of the each color of the backlight unit,

wherein said emission control circuit divides an emission period of at least one color in a sequential emission period of the each color of the backlight unit into a plurality of emissions and controls the emissions, and the emission period of the each color overlaps.

6. A liquid crystal display device according to claim 3, wherein said sequential emission period is set for each one-image display period of a liquid crystal display unit, and an emission of at least one color is divided into a plurality of sub-emissions.

9. A liquid crystal display device according to claim 3, wherein emission start timing of a sub-emission period of each color in said sequential emission period matches.

10. A liquid crystal display device according to claim 3, wherein emission end timing of a sub-emission period of each color in said sequential emission period matches.