2D-DIMMING OF ILLUMINATING MEMBER FOR DISPLAY DEVICE

• US 20100002025A1
• Filed: 02/11/2008
• Published: 01/07/2010
• Est. Priority Date: 02/16/2007
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Van Woudenberg, Roel, Harbers, Gerard, Jacobs, Jean Paul, Langendijk, Erno Hermanus Antonius, Lankhorst, Martijn Henri Richard
• Application Number:
  US12/522,962
• Publication Number:
  US 20100002025A1
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G09G 2320/062 Adjustment of illumination source parameters
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix

Abstract

An illuminating member (4) that, independent of any image content, comprises a central region (5) and an enclosing region (6), wherein said enclosing region (6) is adapted to emit light of lower quality than the light emitted by the central region (5). The illuminating member is adapted to illuminate a display panel (2) of a display device. By having the enclosing region emit light of lower brightness (dimming) a significant power reduction can be achieved for a wide range of typical images while largely maintaining the perceived image quality. Further, by using light emitting elements of lower quality for the enclosing region, manufacturing costs may be reduced while largely maintaining the perceived image quality.

Claims

1. An illuminating member for illuminating a display panel to create an image, said illuminating member, independent of any image content, comprising a central region and an enclosing region enclosing said central region, said enclosing region being adapted to emit light with a brightness which is less than 70% of the brightness of the light emitted by the central region.

3. An illuminating member according to claim 1, wherein the area of the central region has essentially the same size as the area of the enclosing region.

4. An illuminating member according to claim 1, wherein the enclosing region is adapted to emit light with a brightness which is approximately 50% of the brightness of the light emitted by the central region.

5. An illuminating member according to claim 1, wherein at least one of the central region and the enclosing region is further segmented into a lower sub-region and an upper sub-region, each emitting light of a different brightness.

6. An illuminating member according to claim 1, further comprising a controller for altering at least one attribute of the light emitted by the central region and/or the enclosing region.

7. An illuminating member according to claim 6, wherein said controller is configured to alter the at least one attribute of the light emitted by the central region and/or the enclosing region based on data associated with the image.

8. An illuminating member according to claim 1, wherein the central region and the enclosing region each comprise a plurality of light emitting elements.

9. An illuminating member according to claim 8, wherein the density of light emitting elements is lower in the enclosing region than in the central region.

2. (canceled)

10-12. -12. (canceled)

13. A method of driving an illuminating member for illuminating a display panel to create an image, the illuminating member comprising a central region and an enclosing region enclosing said central region, said method comprising:

controlling a central region to emit light of a first brightness; and

controlling an enclosing region, enclosing said central region, to emit light with a brightness which is less than 70% of the brightness of the light emitted by the central region, said central region and said enclosing region defined independently of any image content.

15. A method according to claim 13, further comprising (i) receiving data associated with the image content and (ii) altering the brightness of the light emitted by the central region and/or the enclosing region.

16. A method according to claim 13, further comprising altering the brightness of the light emitted by the central region and/or the enclosing region based on the ambient light level.

14. (canceled)