DISPLAY DEVICE CAPABLE OF COMPENSATING FOR LUMINANCE OF ENVIRONMENTS

• US 20070171217A1
• Filed: 04/06/2006
• Published: 07/26/2007
• Est. Priority Date: 01/20/2006
• Status: Active Grant

• Current Assignee: ASUSTek Computer, Inc.
• Original Assignee: ASUSTek Computer, Inc.
• Inventors: Tsai, Wen-Wei, Tsai, Chin-Peng
• Granted Patent: US 7,633,558 B2
• Time in Patent Office: Days
• US Class Current: 345/207
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

A display device capable of compensating for luminance of an environment is disclosed. The display device includes: a sensor, for sensing the luminance of the environment to generate a sensing signal corresponding to the luminance; a scaler, coupled to the sensor, for processing an original image signal according to the sensing signal to generate an adjusted image signal; and an image outputting device for outputting an image according to the adjusted image signal; wherein the scaler includes: an image signal adjuster for adjusting the original image signal to compensate for the luminance and generate a compensated image signal; and a gain controller coupled to the image signal adjuster for adjusting a gain setting and utilizing the adjusted gain setting to process the compensated image signal in order to generate the adjusted image signal.

Claims

1. A display device capable of compensating for luminance of an environment, the display device comprising:

a sensor, for detecting a luminance of an environment to generate a sensing signal;

a scaler, electrically connected to the sensor, for generating an adjusted image signal according to the sensing signal, the scaler comprising;

an image signal adjuster, for compensating for the luminance of the environment according to the sensing signal, and generating a compensated image signal; and

a gain controller, electrically connected to the image signal adjuster, for adjusting a gain setting according to the sensing signal and utilizing the gain setting to amplify the compensated image signal to generate the adjusted image signal; and

an image outputting device, electrically connected to the scaler, for outputting an image according to the adjusted image signal.

2. The display device capable of compensating for luminance of an environment of claim 1, wherein the image outputting device is a display.

3. The display device capable of compensating for luminance of an environment of claim 2, wherein the display screen is an LCD or a plasma display.

4. The display device capable of compensating for luminance of an environment of claim 1, wherein the display device is a projector.

5. The display device capable of compensating for luminance of an environment of claim 1, wherein the gain controller adjusts the gain setting further according to a specific γ

curve.

6. The display device capable of compensating for luminance of an environment of claim 5, wherein a curvature of the specific γ

curve is 2.2.

7. The display device capable of compensating for luminance of an environment of claim 1, wherein the scaler further comprises:

a storage device, electrically connected to the scaler, for storing a look-up table, the look-up table storing a plurality of gain setting adjustment policies;

wherein the gain controller selects a gain setting adjustment policy from the look-up table according to the sensing signal in order to adjust the gain setting.

8. The display device capable of compensating for luminance of an environment of claim 1, further comprising:

a storage device, electrically connected to the scaler, for storing a look-up table, the look-up table storing a plurality of gain setting adjustment policies;

wherein the gain controller selects a gain setting adjustment policy from the look-up table according to the sensing signal in order to adjust the gain setting.

9. The display device capable of compensating for luminance of an environment of claim 1, wherein the adjusted image signal and the compensated image signal are both composed of RGB signals.

10. The display device capable of compensating for luminance of an environment of claim 1, wherein the sensor is a light-sensing IC, a light-sensing diode, or a light-sensing resistor.

11. A display device capable of compensating for luminance of an environment, the display device comprising:

a display light source;

a sensor, for sensing a luminance of an environment to generate a sensing signal corresponding to the luminance; and

a scaler, electrically connected to the sensor and the display light source, for processing an original image signal according to the sensing signal to generate an adjusted image signal, the scaler comprising;

a light source adjuster, for adjusting the display light source according to the sensing signal to compensate for the luminance;

a gain controller, for adjusting a gain setting according to the sensing signal and utilizing the gain setting to amplify the original image signal to generate the adjusted image signal; and

an image outputting device, electrically connected to the scaler, for outputting an image according to the adjusted image signal.

12. The display device capable of compensating for luminance of an environment of claim 11, wherein the image outputting device is a display.

13. The display device capable of compensating for luminance of an environment of claim 12, wherein the display is an LCD.

14. The display device capable of compensating for luminance of an environment of claim 11, wherein the display device is a projector.

15. The display device capable of compensating for luminance of an environment of claim 11, wherein the gain controller adjusts the gain setting further according to a specific γ

curve.

16. The display device capable of compensating for luminance of an environment of claim 15, wherein a curvature of the specific γ

curve is 2.2.

17. The display device capable of compensating for luminance of an environment of claim 11, wherein the scaler further comprises:

a storage device, electrically connected to the scaler, for storing a look-up table, the look-up table storing a plurality of gain setting adjustment policies;

wherein the gain controller selects a gain setting adjustment policy from the look-up table according to the sensing signal in order to adjust the gain setting.

18. The display device capable of compensating for luminance of an environment of claim 11, further comprising:

a storage device, electrically connected to the scaler, for storing a look-up table, the look-up table storing a plurality of gain setting adjustment policies;

wherein the gain controller selects a gain setting adjustment policy from the look-up table according to the sensing signal in order to adjust the gain setting.

19. The display device capable of compensating for luminance of an environment of claim 11, wherein the adjusted image signal and the compensated image signal are both composed of RGB signals.

20. The display device capable of compensating for luminance of an environment of claim 11, wherein the sensor is a light-sensing IC, a light-sensing diode, or a light-sensing resistor.