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.

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Patent
   RE45796
Priority
Dec 23 2004
Filed
Jun 27 2011
Issued
Nov 10 2015
Expiry
Dec 23 2024
Inventors
Negley, Ge…
Assg.orig
Cree, Inc.
Assg.curr
Brightplus…
Entity
Large
Referenced by
0
References
162
Maint.:
all paid
0. 46. A flat panel comprising:
a plurality of solid metal block bars, a respective one of which includes first and second opposing faces and four ends therebetween, the plurality of solid metal block bars being connected end-to-end in the flat panel, the plurality of solid metal block bars including mating surfaces therebetween; and
a plurality of light emitting diodes (LEDs), a respective one of which is mounted on the first face of a respective solid metal block bar in the flat panel.
0. 37. A flat panel comprising:
a plurality of solid metal block tiles, a respective one of which includes first and second opposing faces and four ends therebetween, the plurality of solid metal block tiles being connected end-to-end in the flat panel, the plurality of solid metal block tiles including mating surfaces therebetween; and
a plurality of light emitting diodes (LEDs), a respective one of which is mounted on the first face of a respective solid metal block tile in the flat panel.
0. 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.
0. 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.
0. 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.
0. 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.
0. 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.
0. 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.
0. 7. A display panel according to claim 6 wherein the two green LED devices emit green light at different frequencies.
0. 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.
0. 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.
0. 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.
0. 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.
0. 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.
0. 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.
0. 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.
0. 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.
0. 16. A display panel according to claim 15 wherein the two green LED devices emit green light at different frequencies.
0. 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.
0. 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.
0. 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.
0. 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.
0. 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.
0. 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.
0. 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.
0. 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.
0. 25. A display panel according to claim 24 wherein the two green LED devices emit green light at different frequencies.
0. 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.
0. 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.
0. 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.
0. 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.
0. 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.
0. 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.
0. 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.
0. 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.
0. 34. A display panel according to claim 33 wherein the two green LED devices emit green light at different frequencies.
0. 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.
0. 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.
0. 38. A flat panel according to claim 37 wherein the plurality of solid metal block tiles are connected end-to-end in the flat panel in a two-dimensional array of solid metal block tiles.
0. 39. A flat panel according to claim 37 in combination with a flat panel frame that is configured to surround the plurality of solid metal block tiles.
0. 40. A flat panel according to claim 39 in further combination with a flat panel electronics module that is supported by the flat panel frame and that is configured to control the at least one of the LEDs.
0. 41. A flat panel according to claim 37 wherein the plurality of solid metal block tiles that are connected end-to-end in the flat panel is at least 17 inches in size along a diagonal thereof.
0. 42. A flat panel according to claim 37 wherein at least one of the LEDs is configured to emit light that appears as white light.
0. 43. A flat panel according to claim 37 wherein a respective first face of a respective solid metal block tile includes a respective reflective cavity therein, and wherein the respective one of the LEDs is mounted in the respective reflective cavity.
0. 44. A flat panel according to claim 37 in further combination with other electrical and/or mechanical elements of the flat panel.
0. 45. A flat panel according to claim 37 wherein the second face includes therein a plurality of metal heat sink fins.
0. 47. A flat panel according to claim 46 wherein the plurality of solid metal block bars are connected end-to-end in the flat panel in a one-dimensional array of bars.
0. 48. A flat panel according to claim 46 in combination with a flat panel frame that is configured to surround the plurality of solid metal block bars.
0. 49. A flat panel according to claim 48 in further combination with a flat panel electronics module that is supported by the flat panel frame and that is configured to control the at least one of the LEDs.
0. 50. A flat panel according to claim 46 wherein the plurality of solid metal block bars that are connected end-to-end in the flat panel is at least 17 inches in size along a diagonal thereof.
0. 51. A flat panel according to claim 46 wherein at least one of the LEDs is configured to emit light that appears as white light.
0. 52. A flat panel according to claim 46 wherein a respective first face of a respective solid metal block bar includes a respective reflective cavity therein, and wherein the respective one of the LEDs is mounted in the respective reflective cavity.
0. 53. A flat panel according to claim 46 in further combination with other electrical and/or mechanical elements of the flat panel.
0. 54. A flat panel according to claim 46 wherein the second face includes therein a plurality of metal heat sink fins.
face-to-face, to be congruent to the planar array 110 of LCD devices. In still other embodiments, as shown in FIG. 7, a plurality of solid metal block tiles 700 are arranged in an array that is congruent to the planar array 110 of LCD devices. The solid metal block bars 600 and/or tiles 700 may be maintained in place by the frame 540 and/or by various interconnection schemes, including mating surfaces and/or fasteners on the bars and/or tiles that can provide mechanical and/or electrical interconnection of the LED devices 130 on the various bars 600 and/or tiles 700.

FIG. 8 is a plan view of a portion of the first face 500a of a solid metal block 500 according to various embodiments of the present invention, illustrating how multiple LEDs may be placed in a single cavity according to various embodiments of the present invention. In particular, as shown in FIG. 8, a semiconductor white light pixel 800 includes a red LED device 810R, a blue LED device 810B, a first green LED device 810G1 and a second green LED device 810G2. The first and second green LED devices 810G1 and 810G2, respectively, emit light at different green frequencies. For example, in some embodiments, the first green LED device 810G1 can emit at 534 nm and the second green LED device 810G2 can emit at 528 nm. The red LED device 810R can emit at 625 nm and the blue LED device 810B can emit at 460 nm. The red, blue, first green and second green LED devices 810R, 810B, 810G1, 810G2, respectively, are configured to emit light that appears as a pixel of white light in operation.

In other embodiments, a single red, green and blue LED device may be configured to emit light that appears as a pixel of white light in operation. For example, in some embodiments, the die size of the red, green and/or blue LED devices may be selected to meet a desired brightness and/or intensity balancing. In one embodiment, standard LEDs marketed by the assignee of the present invention may be used wherein, for example, a C460XT290-Sxx00-A blue LED (290 μm×290 μm), a green C527XB500-S0100-A LED and a conventional red LED may be used. The larger green LED die can provide sufficient optical brightness and may reduce assembly costs compared to a pixel that includes, red, blue, first green and second green LED devices. Other configurations may be used to provide a desired lumen requirements using properly sized die.

FIG. 9 is a cross-sectional view of display panels for flat panel displays according to other embodiments of the present invention. As shown in FIG. 9, these display panels 900 according to other embodiments of the present invention include at least one solid metal block 500 including first and second opposing faces 500a, 500b, respectively, that extend generally parallel to the array 110 of LCD devices. The first metal face 500a includes therein an array of reflector cavities 510 and the second metal face 500b includes therein a plurality of heat sink fins 530. At least one LED device 130 is mounted in a respective reflector cavity 510 such that, in operation, the reflector cavity 510 reflects light that is emitted by the at least one LED device 130 that is mounted therein from the reflector cavity along an optical path 140, as shown in FIG. 9.

In embodiments of FIG. 9, the planar array of LED devices 130 is configured to emit light generally parallel to the planar array of LCD devices 110. Moreover, an array of reflectors 910 also is provided. The reflectors 910 are generally oblique with respect to the first space 500a, and are configured to redirect the light that is emitted generally parallel to the planar array of LCD devices 110 along the light path 140 that extends generally perpendicular to the planar arrays of LCD and LED devices. Accordingly, some geometries according to embodiments of the present invention can provide optical cavities that are generally perpendicular or oblique to the first face 500a and can use a secondary optical reflector 910 to move the photons from generally parallel to the first face 500a to generally orthogonal to the first face 500a. In some embodiments, a flexible film including optical elements may extend parallel to the arrays of LCD and LED devices, similar to the flexible film 560 of FIG. 5. In other embodiments, separate flexible films may be provided across the cavities 510, extending generally orthogonal to the arrays of LCD and LED devices.

It also will be understood by those having skill in the art that various combinations and subcombinations of embodiments of FIGS. 1-9 may be provided according to other embodiments of the present invention. Thus, for example, embodiments of FIG. 9 may be combined with embodiments of FIGS. 5, 6, 7 and/or 8.

In the drawings and specification, there have been disclosed embodiments of the invention and, although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation, the scope of the invention being set forth in the following claims.

INVENTORS:

Negley, Gerald H., van de Ven, Antony P., Hiller, Norbert

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ASSIGNMENT RECORDS    Assignment records on the USPTO
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Jun 27 2011Cree, Inc.(assignment on the face of the patent)
May 13 2019Cree, IncIDEAL Industries Lighting LLCASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0504050240 pdf
Mar 23 2022IDEAL Industries Lighting LLCBrightplus Ventures LLCASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0594320213 pdf
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