Method for driving liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9280937-B2
Application number	US-201414582244-A
Country	US
Kind code	B2
Filing date	Dec 24, 2014
Priority date	Dec 19, 2008
Publication date	Mar 8, 2016
Grant date	Mar 8, 2016

Abstract

A low-resolution image is displayed at high resolution and power consumption is reduced. Resolution is made higher by super-resolution processing. Then, display is performed with the luminance of a backlight controlled by local dimming after the super-resolution processing. By controlling the luminance of the backlight, power consumption can be reduced. Further, by performing the local dimming after the super-resolution processing, accurate display can be performed.

First claim

What is claimed is:

1. An electronic device, comprising:
a backlight comprising a first light source, a second light source, a first light guide plate, a second light guide plate and a light diffusing plate;
a light modulation device; and
a circuit,
wherein the first light source is placed along with a first surface of the first light guide plate;
wherein the second light source is placed along with a first surface of the second light guide plate;
wherein a second surface of the first light guide plate is placed so as to face a first surface of the light diffusing plate;
wherein a second surface of the second light guide plate is placed so as to face the first surface of the light diffusing plate;
wherein a surface of the light modulation device is placed so as to face a second surface of the light diffusing plate,
wherein each light intensity of a first area where the light modulation device is overlapped with the second surface of the first light guide plate and a second area where the light modulation device is overlapped with the second surface of the second light guide plate is independently controllable,
wherein the circuit is configured to form signals for a local dimming processing and to provide the signals to the backlight and the light modulation device, and
wherein the backlight and the light modulation device is configured to perform the local dimming processing by using the signals.

2. The electronic device according to claim 1 ,
wherein the light modulation device comprises a pair of electrodes and liquid crystal therebetween.

3. The electronic device according to claim 1 ,
wherein the first light guide plate is a triangular prism comprising a first side surface, a second side surface and a third side surface,
wherein the first light source is placed along with the first side surface,
wherein the second side surface is placed so as to be parallel to the first surface of the light diffusing plate, and
wherein an area of the first side surface of the first light guide plate is the smallest among the first side surface, the second side surface and the third side surface.

4. The electronic device according to claim 1 ,
wherein the circuit is configured to form first signals by a super resolution processing from original image signals,
wherein the circuit is configured to form second signals by an edge enhancement processing from the first signals, and
wherein the circuit is configured to form the signals for the local dimming processing from the second signals.

5. The electronic device according to claim 1 ,
wherein the first light source comprises a point light source.

6. The electronic device according to claim 1 ,
wherein the first light source comprises of a plurality of point light sources arranged in a line.

7. An electronic device, comprising:
a backlight comprising a first light source, a second light source, a first light guide plate, a second light guide plate and a light diffusing plate;
a light modulation device; and
a circuit,
wherein the first light source is placed along with a first surface of the first light guide plate;
wherein the second light source is placed along with a first surface of the second light guide plate;
wherein a second surface of the first light guide plate is placed so as to face a first surface of the light diffusing plate;
wherein a second surface of the second light guide plate is placed so as to face the first surface of the light diffusing plate;
wherein a surface of the light modulation device is placed so as to face a second surface of the light diffusing plate,
wherein each light intensity of a first area where the light modulation device is overlapped with the second surface of the first light guide plate and a second area where the light modulation device is overlapped with the second surface of the second light guide plate is independently controllable,
wherein the circuit is configured to form signals for a local dimming processing and a second processing selected from the group consisting of a super resolution processing, an edge enhancement processing and a frame interpolation processing, and to provide the signals to the backlight and the light modulation device, and
wherein the backlight and the light modulation device is configured to perform the local dimming processing by using the signals.

8. The electronic device according to claim 7 ,
wherein the light modulation device comprises a pair of electrodes and liquid crystal therebetween.

9. The electronic device according to claim 7 ,
wherein the first light guide plate is a triangular prism comprising a first side surface, a second side surface and a third side surface,
wherein the first light source is placed along with the first side surface,
wherein the second side surface is placed so as to be parallel to the first surface of the light diffusing plate, and
wherein an area of the first side surface of the first light guide plate is the smallest among the first side surface, the second side surface and the third side surface.

10. The electronic device according to claim 7 ,
wherein the circuit is configured to form first signals by the super resolution processing from original image signals,
wherein the circuit is configured to form second signals by the edge enhancement processing from the first signals, and
wherein the circuit is configured to form the signals for the local dimming processing from the second signals.

11. The electronic device according to claim 7 ,
wherein the first light source comprises a point light source.

12. The electronic device according to claim 7 ,
wherein the first light source comprises of a plurality of point light sources arranged in a line.

13. An electronic device, comprising:
a backlight comprising a first light source, a second light source, a light guide plate, and a light diffusing plate;
a light modulation device; and
a circuit,
wherein the first light source is placed along with a first surface of the light guide plate;
wherein a second surface of the light guide plate is placed so as to face a first surface of the light diffusing plate;
wherein a surface of the light modulation device is placed so as to face a second surface of the light diffusing plate,
wherein each light intensity of the first light source and the second light source is independently controllable,
wherein the circuit is configured to form signals for a local dimming processing and to provide the signals to the backlight and the light modulation device, and
wherein the backlight and the light modulation device is configured to perform the local dimming processing by using the signals.

14. The electronic device according to claim 13 ,
wherein the light modulation device comprises a pair of electrodes and liquid crystal therebetween.

15. The electronic device according to claim 13 ,
wherein the light guide plate is a triangular prism comprising a first side surface, a second side surface and a third side surface,
wherein the first light source is placed along with the first side surface,
wherein the second side surface is placed so as to be parallel to the first surface of the light diffusing plate, and
wherein an area of the first side surface of the light guide plate is the smallest among the first side surface, the second side surface and the third side surface.

16. The electronic device according to claim 13 ,
wherein the circuit is configured to form first signals by a super resolution processing from original image signals,
wherein the circuit is configured to form seco

Assignees

• Semiconductor Energy Lab

Inventors

• Kimura Hajime

Classifications

• G09G2340/0435

  Change or adaptation of the frame rate of the video stream · CPC title

• G09G2320/062

  Adjustment of illumination source parameters · CPC title

• G09G3/3406 Primary

  Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336) · CPC title

• G09G2340/0407

  Resolution change, inclusive of the use of different resolutions for different screen areas · CPC title

• H04N5/142

  Edging; Contouring · CPC title