Light emitting diode arrays for direct backlighting of liquid crystal displays

• US 7,322,732 B2
• Filed: 12/23/2004
• Issued: 01/29/2008
• Est. Priority Date: 12/23/2004
• Status: Expired

• Current Assignee: Brightplus Ventures LLC (IPValuation Partners, LLC)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Negley, Gerald H., Van de Ven, Antony P., Hiller, Norbert
• Primary Examiner(s): Alavi, Alli
• Assistant Examiner(s): Carter, William J
• Application Number:
  US11/022,332
• Publication Number:
  US 20060139945A1
• Time in Patent Office: 1,132 Days
• Field of Search: 362/612
• US Class Current: 362/612
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133628 with cooling means

Abstract

A display panel for a flat panel display includes a planar array of LCD devices and a planar array of LED devices that is closely spaced apart from the planar array of LCD devices, at least some of the LED devices being disposed within a periphery of the array of LCD devices such that, in operation, the planar array of LED devices provides backlighting for the planar array of LCD devices. The planar array of LED devices can include at least one solid metal block having first and second opposing metal faces. The first metal face includes therein an array of reflector cavities, and the second metal face includes therein heat sink fins that are exposed at the back face of the flat panel display.

Claims

1. A display panel for a flat panel display comprising:

a front face comprising a planar array of liquid crystal display (LCD) devices; and

a back face comprising at least one solid metal block including first and second opposing metal faces that extend parallel to the array of LCD devices, wherein the first metal face is facing toward the array of LCD devices and the second metal face is facing away from the array of LCD devices, the first metal face including therein an array of reflector cavities and the second metal face including therein a plurality of heat sink fins that are exposed at the back face of the flat panel display; and

at least one LED device mounted in a respective reflector cavity such that, in operation, the reflector cavity reflects light that is emitted by the at least one LED device that is mounted therein away from the reflector cavity;

wherein the at least one solid metal block comprises a plurality of solid metal block tiles that are arranged in an array that is congruent to the planar array of LCD devices.

2. A display panel according to claim 1 in combination with a frame that is configured to surround the front and back faces of the display panel.

3. A display panel according to claim 2 in further combination with an electronics module that is supported by the frame and that is configured to control the array of LCD devices and the at least one LED device.

4. A display panel according to claim 1 wherein the planar array of LCD devices is at least 17 inches in size along a diagonal thereof.

5. A display panel according to claim 1 wherein the at least one LED device is configured to emit light that appears as white light.

6. A display panel according to claim 5 wherein the at least one LED device that is mounted in a respective reflector cavity and that is configured to emit light that appears as white light consists of:

a red LED device;

a blue LED device; and

two green LED devices.

7. A display panel according to claim 6 wherein the two green LED devices emit green light at different frequencies.

8. A display panel according to claim 1 further comprising:

a planar optical film that is located between the planar array of LCD devices and the at least one LED device such that, in operation, the at least one LED device transmits light through the planar optical film and to the planar array of LCD devices.

9. A display panel according to claim 1 in combination with other electrical and/or mechanical elements to provide a computer monitor and/or a television.

10. A display panel for a flat panel display comprising:

a front face comprising a planar array of liquid crystal display (LCD) devices; and

a back face comprising at least one solid metal block including first and second opposing metal faces that extend parallel to the array of LCD devices, wherein the first metal face is facing toward the array of LCD devices and the second metal face is facing away from the array of LCD devices, the first metal face including therein an array of reflector cavities and the second metal face including therein a plurality of heat sink fins that are exposed at the back face of the flat panel display; and

at least one LED device mounted in a respective reflector cavity such that, in operation, the reflector cavity reflects light that is emitted by the at least one LED device that is mounted therein away from the reflector cavity;

wherein the at least one solid metal block comprises a plurality of solid metal block bars that are arranged face-to-face to be congruent to the planar array of LCD devices.

11. A display panel according to claim 10 in combination with a frame that is configured to surround the front and back faces of the display panel.

12. A display panel according to claim 11 in further combination with an electronics module that is supported by the frame and that is configured to control the array of LCD devices and the at least one LED device.

13. A display panel according to claim 10 wherein the planar array of LCD devices is at least 17 inches in size along a diagonal thereof.

14. A display panel according to claim 10 wherein the at least one LED device is configured to emit light that appears as white light.

15. A display panel according to claim 14 wherein the at least one LED device that is mounted in a respective reflector cavity and that is configured to emit light that appears as white light consists of:

a red LED device;

a blue LED device; and

two green LED devices.

16. A display panel according to claim 15 wherein the two green LED devices emit green light at different frequencies.

17. A display panel according to claim 10 further comprising:

a planar optical film that is located between the planar array of LCD devices and the at least one LED device such that, in operation, the at least one LED device transmits light through the planar optical film and to the planar array of LCD devices.

18. A display panel according to claim 10 in combination with other electrical and/or mechanical elements to provide a computer monitor and/or a television.

19. A display panel for a flat panel display comprising:

a front face comprising a planar array of liquid crystal display (LCD) devices; and

a back face comprising at least one solid metal block including first and second opposing metal faces that extend parallel to the array of LCD devices, wherein the first metal face is facing toward the array of LCD devices and the second metal face is facing away from the array of LCD devices, the second metal face including therein a plurality of heat sink fins that are exposed at the back face of the flat panel display; and

a plurality of LED devices mounted on the first metal face;

wherein the at least one solid metal block comprises a plurality of solid metal block tiles that are arranged in an array that is congruent to the planar array of LCD devices.

20. A display panel according to claim 19 in combination with a frame that is configured to surround the front and back faces of the display panel.

21. A display panel according to claim 20 in further combination with an electronics module that is supported by the frame and that is configured to control the array of LCD devices and the at least one LED device.

22. A display panel according to claim 19 wherein the planar array of LCD devices is at least 17 inches in size along a diagonal thereof.

23. A display panel according to claim 19 wherein the at least one LED device is configured to emit light that appears as white light.

24. A display panel according to claim 23 wherein the at least one LED device that is mounted in a respective reflector cavity and that is configured to emit light that appears as white light consists of:

a red LED device;

a blue LED device; and

two green LED devices.

25. A display panel according to claim 24 wherein the two green LED devices emit green light at different frequencies.

26. A display panel according to claim 19 further comprising:

a planar optical film that is located between the planar array of LCD devices and the at least one LED device such that, in operation, the at least one LED device transmits light through the planar optical film and to the planar array of LCD devices.

27. A display panel according to claim 19 in combination with other electrical and/or mechanical elements to provide a computer monitor and/or a television.

28. A display panel for a flat panel display comprising:

a front face comprising a planar array of liquid crystal display (LCD) devices; and

a back face comprising at least one solid metal block including first and second opposing metal faces that extend parallel to the array of LCD devices, wherein the first metal face is facing toward the array of LCD devices and the second metal face is facing away from the array of LCD devices, the second metal face including therein a plurality of heat sink fins that are exposed at the back face of the flat panel display; and

a plurality of LED devices mounted on the first metal face;

wherein the at least one solid metal block comprises a plurality of solid metal block bars that are arranged face-to-face to be congruent to the planar array of LCD devices.

29. A display panel according to claim 28 in combination with a frame that is configured to surround the front and back faces of the display panel.

30. A display panel according to claim 29 in further combination with an electronics module that is supported by the frame and that is configured to control the array of LCD devices and the at least one LED device.

31. A display panel according to claim 28 wherein the planar array of LCD devices is at least 17 inches in size along a diagonal thereof.

32. A display panel according to claim 28 wherein the at least one LED device is configured to emit light that appears as white light.

33. A display panel according to claim 32 wherein the at least one LED device that is mounted in a respective reflector cavity and that is configured to emit light that appears as white light consists of:

a red LED device;

a blue LED device; and

two green LED devices.

34. A display panel according to claim 33 wherein the two green LED devices emit green light at different frequencies.

35. A display panel according to claim 28 further comprising:

a planar optical film that is located between the planar array of LCD devices and the at least one LED device such that, in operation, the at least one LED device transmits light through the planar optical film and to the planar array of LCD devices.

36. A display panel according to claim 28 in combination with other electrical and/or mechanical elements to provide a computer monitor and/or a television.