High efficiency low power LED backlighting system for liquid crystal display

• US 20050231978A1
• Filed: 03/21/2005
• Published: 10/20/2005
• Est. Priority Date: 03/23/2004
• Status: Abandoned Application

• Current Assignee: Anthony Mark Kvenvold, Brad Harkavy
• Original Assignee: Anthony Mark Kvenvold, Brad Harkavy
• Inventors: Kvenvold, Anthony Mark, Harkavy, Brad
• Application Number:
  US11/085,677
• Publication Number:
  US 20050231978A1
• Time in Patent Office: Days
• US Class Current: 362/600
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix

Abstract

A backlighting system for liquid crystal display provides low power consumption and high efficiency. The backlighting system includes an array of LEDs arranged in a matrix to generate backlight needed to display light and dark colors on the liquid crystal display. The backlighting system emulates light and dark areas of video images being displayed on the liquid crystal display, selectively backlighting only areas of the liquid crystal display that require backlighting, thereby reducing power consumption.

Claims

1. A backlighting system for a liquid crystal display showing video images, the backlighting system comprising:

an array of LEDs arranged in a matrix to generate backlight for the liquid crystal display;

a solid state circuit unit to control individually each LED in the array;

an interconnect means for carrying power and for communicating information to the solid state circuit;

a control means for receiving a video display information, converting the video display information into light intensity information, and communicating the light intensity information to the solid state circuits; and

a power supply to power the backlighting system.

2. The backlighting system according to claim 1, wherein the solid state circuit is a pre-programmed solid state circuit.

3. The backlighting system according to claim 1, wherein the solid state circuit is a programmable solid state circuit.

4. The backlighting system according to claim 1, wherein the control means comprises at least one input/output register for receiving video display information and splitting the video display information into two matching video display signals, a first video display signal and a second video display signal.

5. The backlighting system according to claim 4, wherein the first video display signal is communicated to the liquid crystal display.

6. The backlighting system according to claim 4, wherein the control means further comprising a microcontroller for encoding the second video display signal into a communication signal.

7. The backlighting system according to claim 4, wherein the control means further comprising a plurality of microcontrollers for decoding the communication signal and communicating the communication signal to the solid state circuits to individually control the illumination level of each LED in the array.

8. The backlighting system according to claim 7, wherein the illumination level of each LED in the array of the LED matrix is in sync with the video image being displayed on the liquid crystal display.

9. The backlighting system according to claim 8, wherein power consumed by the backlighting system is reduced by the individual illumination of each LED in the array in sync with the video image being displayed by the liquid crystal display.

10. The backlighting system according to claim 8, wherein heat produced by the illumination of the LED matrix is reduced by the individual illumination of each LED in the array in sync with the video being displayed by the LCD.

11. The backlighting system according to claim 4, wherein the communication signal is in a form of addressable communication data.

12. The backlighting system according to claim 4, wherein the communication signal is in a form of serial communication data.