LUMINANCE CONTROL METHODS AND DISPLAY DEVICES

• US 20080180426A1
• Filed: 01/07/2008
• Published: 07/31/2008
• Est. Priority Date: 01/26/2007
• Status: Abandoned Application

• Current Assignee: InnoLux Corporation
• Original Assignee: TPO Displays Corporation (InnoLux Corporation)
• Inventors: Peng, Du-Zen, Liu, Ping-Lin
• Application Number:
  US11/969,942
• Publication Number:
  US 20080180426A1
• Time in Patent Office: Days
• US Class Current: 345/207
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters

Abstract

A display device is provided. The display device includes a display panel outputting corresponding luminance according to a luminance control signal. The display device further includes a luminance detection device detecting ambient luminance in real time, and outputting a detected voltage according to the detected ambient luminance. A luminance control device of the display device outputs the luminance control signal at a predetermined time interval for adjusting the luminance of the display panel according to the detected voltage.

Claims

1. A display device, comprising:

a display panel outputting corresponding luminance according to a luminance control signal;

a luminance detection device detecting ambient luminance in real time and outputting a detected voltage according to the detected ambient luminance; and

a luminance control device outputting the luminance control signal according to the detected voltage at a predetermined time interval to adjust the luminance of the display panel.

2. The display device as claimed in claim 1, wherein the luminance detection device comprises:

a light sensor generating an induced current according to the detected ambient luminance; and

a voltage control circuit generating the detected voltage according to the induced current.

3. The display device as claimed in claim 2, wherein the luminance control device comprises:

a comparison circuit comparing a difference between the detected voltage and a reference voltage, and outputting a comparison result;

a latch circuit coupled to the comparison circuit for latching the comparison result and outputting a detected result at the predetermined time interval according to a sensor signal; and

a multiplexer coupled to the latch circuit for outputting the luminance control signal chosen from a plurality of luminance signals according to the detected result.

4. The display device as claimed in claim 3, further comprising a signal generating circuit generating the sensor signal at a fixed time interval.

5. The display device as claimed in claim 3, further comprising a signal generating circuit determining whether a difference range between the comparison result and a previous comparison result exceeds a predetermined range, and generating the sensor signal when the difference range exceeds the predetermined range.

6. The display device as claimed in claim 3, further comprising a signal generating circuit calculating a maintenance period of the comparison result, and generating the sensor signal when the maintenance period exceeds a predetermined period.

7. The display device as claimed in claim 1, wherein the predetermined time interval exceeds 1/60 s.

8. The display device as claimed in claim 1, wherein the display panel is a liquid crystal panel or an organic light emitting diode panel.

9. A display device, comprising:

a display panel outputting corresponding luminance according to a luminance control signal;

a luminance detection device detecting ambient luminance in real time and outputting a detected voltage according to the detected ambient luminance at a predetermined time interval; and

a luminance control device outputting the luminance control signal according to the detected voltage.

10. The display device as claimed in claim 9, wherein the luminance detection device comprises:

a light sensor generating an induced current according to the detected ambient luminance;

a voltage control circuit generating an induced voltage according to the induced current; and

a latch circuit coupled to the voltage control circuit for latching the induced voltage and outputting a detected voltage at the predetermined time interval according to a sensor signal.

11. The display device as claimed in claim 10, wherein the luminance control device comprises:

a comparison circuit coupled to the latch circuit for comparing a difference between the detected voltage and a reference voltage, and outputting a comparison result; and

a multiplexer coupled to the comparison circuit for outputting the luminance control signal chosen from a plurality of luminance signals according to the comparison result.

12. The display device as claimed in claim 11, further comprising a signal generating circuit generating the sensor signal at a fixed time interval.

13. The display device as claimed in claim 11, further comprising a signal generating circuit determining whether a difference range between the induced voltage and a previous induced voltage exceeds a predetermined range, and generating the sensor signal when the difference range exceeds the predetermined range.

14. The display device as claimed in claim 11, further comprising a signal generating circuit calculating a maintenance period of the induced voltage, and generating the sensor signal when the maintenance period exceeds a predetermined period.

15. A luminance control method for controlling luminance of a display panel, the luminance control method comprising:

detecting ambient luminance in real time and generating a detected result at a predetermined time interval; and

outputting a luminance control signal for adjusting the luminance of the display panel according to the detected result.

16. The luminance control method as claimed in claim 15, further comprising:

generating a detected voltage according to the detected ambient luminance;

comparing a difference between the detected voltage and a reference voltage, and generating a comparison result;

latching the comparison result and outputting the detected result at the predetermined time interval according to a sensor signal; and

outputting the luminance control signal chosen from a plurality of luminance signals according to the detected result.

17. The luminance control method as claimed in claim 15, further comprising:

generating a detected voltage according to the detected ambient luminance;

comparing a difference between the detected voltage and a first reference voltage and a second reference voltage and generating a comparison result;

latching the comparison result and outputting the detected result at the predetermined time interval according to a sensor signal; and

outputting the luminance control signal chosen from a plurality of luminance signals according to the detected result.

18. The luminance control method as claimed in claim 16, further comprising generating the sensor signal at a fixed time interval.

19. The luminance control method as claimed in claim 16, further comprising determining whether a difference range between the comparison result and a previous comparison result exceeds a predetermined range, and generating the sensor signal when the difference range exceeds the predetermined range.

20. The luminance control method as claimed in claim 16, further comprising calculating a maintenance period of the comparison result, and generating the sensor signal when the maintenance period exceeds a predetermined period.