DISPLAY DEVICE WITH AUTOMATIC BRIGHTNESS ADJUSTMENT AND METHOD FOR OPERATING THE SAME

• US 20110012933A1
• Filed: 03/29/2010
• Published: 01/20/2011
• Est. Priority Date: 07/14/2009
• Status: Abandoned Application

• Current Assignee: HannStar Display Corporation
• Original Assignee: HannStar Display Corporation
• Inventors: WENG, Bomin
• Application Number:
  US12/748,983
• Publication Number:
  US 20110012933A1
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G09G 2320/062 Adjustment of illumination source parameters
• 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 3/36 using liquid crystals

Abstract

A display device is provided. The display device includes a system module detecting an image signal and outputting a first frequency in response thereto, wherein the first frequency is adjusted to a second frequency when the image signal is switched.

Claims

1. A display device, comprising:

a system module detecting an image signal and outputting a first frequency in response thereto, wherein the first frequency is adjusted to a second frequency when the image signal is switched.

2. A display device as claimed in claim 1, wherein the system module further comprises a controller including a signal sensor and a memory.

3. A display device as claimed in claim 1, wherein the image signal comprises one selected from a group consisting of an HDMI, a DTV, a TV, a VGA, an AV, a YPbPr and an SCART signals.

4. A display device as claimed in claim 1, further comprising:

a display receiving a driving signal to generate an image having a first brightness, and including;

a panel receiving the driving signal to display the image; and

an internal light source serving as a backlight of the display to provide the first brightness; and

a light source adjusting module outputting a driving pulse to the internal light source in response to the first frequency for adjusting the first brightness to a second brightness.

5. A display device as claimed in claim 4, wherein the light source adjusting module is operated in a burst mode.

6. A display device as claimed in claim 4, wherein when the image signal is an HDMI signal and the first brightness is 300 cd/m², the first frequency is 220 Hz and the first brightness of 300 cd/m² is serving as the second brightness.

7. A display device as claimed in claim 6, wherein when the image signal is switched to an SCART signal and the first brightness is 290 cd/m², the first frequency is adjusted to the second frequency at 230 Hz for adjusting the first brightness of 290 cd/m² to the second brightness of 300 cd/m².

8. A display device as claimed in claim 1, wherein the display device is a liquid crystal display device, and the internal light source is a fluorescent tube.

9. A display device as claimed in claim 1, wherein the display device is a rear projection display device, and the internal light source is a fluorescent tube.

10. A display device as claimed in claim 1, wherein the display device is a projection device, and the internal light source is a fluorescent tube.

11. A system module, outputting a first frequency in response to an image signal, wherein the first frequency is adjusted to a second frequency when the image signal is switched.

12. A system module as claimed in claim 11, further comprising a controller including a signal sensor and a memory.

13. A system module as claimed in claim 11, wherein the image signal comprises one selected from a group consisting of an HDMI, a DTV, a TV, a VGA, an AV, a YPbPr and an SCART signals.

14. A system module as claimed in claim 11, wherein the system module is used for a display device, the display device has an image having a first brightness, and the first brightness is adjusted to a second brightness when the first frequency is adjusted to the second frequency.

15. A system module as claimed in claim 14, wherein when the image signal is an HDMI signal and the first brightness is 300 cd/m², the first frequency is 220 Hz and the first brightness of 300 cd/m² is serving as the second brightness.

16. A system module as claimed in claim 14, wherein when the image signal is switched to an SCART signal and the first brightness is 290 cd/m², the first frequency is adjusted to the second frequency at 230 Hz for adjusting the first brightness of 290 cd/m² to the second brightness of 300 cd/m².

17. A method for operating a display device, comprising steps of:

(a) detecting an image signal;

(b) outputting a first frequency in response to the image signal; and

(c) adjusting the first frequency to a second frequency when the image signal is switched.

18. A method as claimed in claim 17, further comprising the following sub-steps after the step (a):

(a1) receiving the image signal;

(a2) outputting a driving signal based on the image signal;

(a3) receiving the driving signal; and

(a4) displaying an image having a first brightness based on the driving signal.

19. A method as claimed in claim 18, further comprising the following sub-step after the step (c):

(c1) adjusting the first brightness to a second brightness in response to the second frequency.

20. A method as claimed in claim 17, wherein the image signal comprises one selected from a group consisting of an HDMI, a DTV, a TV, a VGA, an AV, a YPbPr and an SCART signals.