DISPLAY BACKLIGHT SYSTEM AND METHOD

• US 20080185976A1
• Filed: 02/05/2007
• Published: 08/07/2008
• Est. Priority Date: 02/05/2007
• Status: Abandoned Application

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Dickey, Bill A., Praiswater, Michael R.
• Application Number:
  US11/671,202
• Publication Number:
  US 20080185976A1
• Time in Patent Office: Days
• US Class Current: 315/294
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 3/342 using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: H05B 45/28 using temperature feedback
• CPC Class Codes: H05B 45/46 having LEDs disposed in parallel lines

Abstract

A system and method for controlling backlight luminance of a display that includes a display region in which an image may be selectively rendered includes one or more devices for determining if operation in a reduced power mode is desired. If operation in the reduced power mode is not desired, the display region is at least substantially uniformly backlit. If operation in the reduced power mode is desired, only selected sections of the display region are selectively backlit.

Claims

1. A backlight system for a display, comprising:

a plurality of light sources, each light source coupled to be selectively energized and deenergized and operable, upon being energized to emit light and illuminate a portion of the display;

a backlight controller configured to determine if reduced power operation is desired and, if so, to selectively deenergize selected ones of the light sources and selectively energize selected other ones of the light sources.

2. The backlight system of claim 1, wherein the backlight controller is further configured to energize each light source if reduced power operation is not desired.

3. The backlight system of claim 1, wherein:

the backlight controller is adapted to receive an input signal; and

the backlight controller is responsive to the input signal to determine if reduced power operation is desired.

4. The system of claim 3, further comprising:

a user interface in operable communication with the backlight controller, the user interface configured to receive input stimuli from a user and, in response to the user stimuli, to selectively supply the input signal.

5. The system of claim 3, wherein the input signal is at least representative of representative of the thermal state of the display.

6. The system of claim 3, wherein:

the backlight controller is adapted to receive power from a power supply; and

the input signal is at least representative of the power supply state.

7. The system of claim 6, wherein:

the power supply is either a primary power supply or a backup power supply; and

the input signal is at least representative of which power supply is supplying power to the backup controller.

8. The system of claim 3, wherein the input signal is at least representative of the state of one or more sensor signals.

9. The system of claim 1, wherein:

the backlight controller is adapted to receive image data representative of images to be rendered by the display; and

the backlight controller is further configured, upon receipt of the image data, to selectively deenergize selected ones of the light sources and selectively energize selected other ones of the light sources.

10. The system of claim 1, wherein the backlight controller is further configured to selectively reduce electrical power supplied to the selectively energized light sources.

11. The system of claim 1, wherein each light source comprises a plurality of light emitting diodes (LEDs).

12. A display device, comprising:

a display including a display region in which an image may be selectively rendered;

a backlight spaced apart from the display region and including a plurality of light sources, each light source coupled to be selectively energized and deenergized and operable, upon being energized, to emit light; and

a backlight controller coupled to the backlight, the backlight controller configured to;

(i) determine if reduced power operation is desired,

(ii) energize each light source in a manner that at least substantially uniformly backlights the display region if reduced power operation is not desired, and

(iii) selectively deenergize selected ones of the light sources and selectively energize selected other ones of the light sources in a manner that selectively backlights only selected sections of the display region if reduced power operation is desired.

13. The display device of claim 12, wherein the backlight controller is responsive to an input signal to determine if reduced power operation is desired.

14. The display device of claim 13, further comprising:

a user interface in operable communication with the backlight controller, the user interface configured to receive input stimuli from a user and, in response to the user stimuli, to selectively supply the input signal.

15. The display device of claim 13, further comprising:

a thermal sensor in operable communication with the backlight controller, the thermal sensor configured to sense the thermal state of the display and supply a signal representative thereof as the input signal.

16. The display device of claim 13, further comprising:

a power supply configured to supply power to the backlight controller,

wherein the input signal is at least representative of the power supply state.

17. The display device of claim 13, further comprising:

a primary power supply configured to selectively supply power to the backlight controller; and

a backup power supply configured to selectively supply power to the backlight controller,

wherein the input signal is at least representative of which power supply is supplying power to the backup controller.

18. The display device of claim 13, further comprising:

a sensor operable to supply a sensor signal to the display representative of one or more parameters to be rendered in the display region,

wherein the input signal is at least representative of the state of the sensor signal.

19. The display device of claim 13, further comprising:

a display controller in operable communication with the display and the backlight controller, the display controller configured to (i) selectively cause the image to be selectively displayed in the display region and (ii) to supply image data representative of the image to be rendered,

wherein the backlight controller is adapted to receive the image data and is further configured, upon receipt of the image data, to selectively deenergize selected ones of the light sources and selectively energize selected other ones of the light sources.

20. The display device of claim 12, wherein the backlight controller is further configured to selectively reduce electrical power supplied to the selectively energized light sources.

21. The display device of claim 12, wherein each light source comprises a plurality of light emitting diodes (LEDs).

22. A method of controlling backlight luminance of a display, the display including a display region in which an image may be selectively rendered, the method comprising the steps of:

determining if operation in a reduced power mode is desired;

at least substantially uniformly backlighting the display region if operation in the reduced power mode is not desired; and

selectively backlighting only selected sections of the display region if operation in the reduced power mode is desired.