Light emitting diode display

• US 8,136,960 B2
• Filed: 11/12/2008
• Issued: 03/20/2012
• Est. Priority Date: 11/12/2008
• Status: Active Grant

• Current Assignee: American Opto Plus Led Corporation (OPTO Plus Technologies Co. Ltd.)
• Original Assignee: American Opto Plus Led Corporation (OPTO Plus Technologies Co. Ltd.)
• Inventors: Wu, Eric Cheng Yuan
• Primary Examiner(s): Ward, John A
• Application Number:
  US12/269,846
• Publication Number:
  US 20100118529A1
• Time in Patent Office: 1,224 Days
• Field of Search: 362235-240, 362/311.01, 362/311.02, 313510-512, 408/154.4, 408/154.5
• US Class Current: 362/235
• CPC Class Codes: G09F 9/3023 Segmented electronic displays
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes

Abstract

An LED display with a reduced thickness is described. In one embodiment, the LED display includes a second support plate between a front support plate and a back support plate. The second support plate enables the front support plate to be thinner than if the second support plate was not included. The second support plate increases the distance between an LED chip and a light exit surface thereby allowing the front support plate thickness to be reduced by about the thickness of the second support plate. In one embodiment, the second support plate allows the thickness of an LED display to be thinner. The second support plate adds structural integrity to a back support plate. Therefore, the back support plate can be thinner, and thickness of the LED display can be reduced.

Claims

1. A light emitting display comprising:

a front support plate with a front support plate through-hole, wherein the front support plate comprises a front support plate thickness and the front support plate through-hole comprises a first shaped opening;

a second support plate with a second support plate through-hole, wherein the second support plate comprises a second support plate thickness and the second support plate through-hole comprises a second shaped opening;

wherein the second support plate is provided to the front support plate and the second support plate through-hole is connected to the front support plate through-hole;

a back support plate provided to the second support plate, wherein the back support plate comprises a back support plate thickness;

a light emitting device provided to the back support plate, wherein the light emitting device is within the second support plate through-hole;

a first light transmissive layer provided in the front support plate through-hole, wherein the first light transmissive layer comprises a first light transmissive material; and

a second light transmissive layer provided in the second support plate through-hole, wherein the second light transmissive layer comprises a second light transmissive material,

wherein the front support plate extends at least partially beyond at least one outer edge of the second support plate.

2. A light emitting display of claim 1, wherein the light emitting device comprises an LED.

3. A light emitting display of claim 1, wherein the first light transmissive layer substantially fills the front support plate through-hole and the second light transmissive layer substantially fills the second support plate through-hole.

4. A light emitting display of claim 3, wherein the first light transmissive material and the second light transmissive material comprise light-diffusing material.

5. A light emitting display of claim 3, wherein the first light transmissive material and the second light transmissive material comprise an epoxy.

6. A light emitting display of claim 1, wherein the first light transmissive material comprises a light diffusing material and the second light transmissive material comprises a light transparent material.

7. A light emitting display of claim 1, further comprising a light transmissive panel provided to the front support plate.

8. A light emitting display of claim 1, wherein the front support panel comprises a reflective material.

9. A light emitting display of claim 1, further comprising a reflective layer provided to an interior surface of the front support plate through-hole.

10. A light emitting display of claim 9, further comprising a reflective layer provided to an interior surface of the second support plate through-hole.

11. A light emitting display of claim 1, wherein the front support plate thickness is less than about 2 mm.

12. A light emitting display of claim 1, wherein the front support plate thickness is less than about 1 mm.

13. A light emitting display of claim 1, further comprising a light exit surface defined by an area of the front support panel through-hole wherein, in use, a light emitted by the light emitting device exits, and wherein, in use, the light emitted out of the light exit surface is substantially uniform.

14. A light emitting display of claim 13, wherein a distance between the light emitting device and the light exit surface is between about 0 to 5 mm.

15. A light emitting display of claim 1, further comprising:

a plurality of front support plate through-holes;

a plurality of second support plate through-holes;

a plurality of light emitting devices; and

wherein at least one light emitting device is located in each of the plurality of second support plate through-holes, and each of the plurality of second support plate through-holes is connected to at least one of the plurality of front support plate through-holes to form a plurality of segments.

16. A light emitting display of claim 15, wherein the plurality of segments are arranged to selectively display characters.

17. The light emitting display of claim 1, wherein the first light transmissive material diffuses light.

18. The light emitting display of claim 1, wherein at least a portion of the second support plate is at least partially directly below the front support plate through-hole.

19. The light emitting display of claim 1, wherein front support plate is a printed circuit board.

20. A light emitting display comprising:

a front support plate with a front support plate through-hole, wherein the front support plate comprises a front support plate thickness and the front support plate through-hole comprises a first shaped opening;

a second support plate with a second support plate through-hole, wherein the second support plate comprises a second support plate thickness and the second support plate through-hole comprises a second shaped opening;

wherein the second support plate is provided to the front support plate and the second support plate through-hole is connected to the front support plate through-hole;

a back support plate provided to the second support plate, wherein the back support plate comprises a back support plate thickness; and

a light emitting device provided to the back support plate, wherein the light emitting device is within the second support plate through-hole,

wherein at least a portion of the front support plate through-hole is directly above the light emitting device such that the light emitting device is at least partially between the back support plate and the front support plate through-hole.

21. The light emitting display of claim 20, wherein front support plate is a printed circuit board.

22. An light emitting module for providing back lighting for a display panel designed to be attached to a front of an appliance or the like, the light emitting module comprising:

a light emitting device;

a support plate having an opening therein and having a front side and a back side; and

a back plate secured to the back side of the support plate such that an interior surface of the opening of the support plate and an interior surface of the back plate form a recess, the recess sized to accept the light emitting device and the light emitting device secured to the interior surface of the back plate within the recess,

wherein the support plate provides structural support for the light emitting device such that the back plate has a thickness less than a thickness of a back plate that would be necessary to provide similar structural support for the light emitting device without the support plate, and

the back plate sized such that it may be secured behind an opening in a display panel printed circuit board of a type used in a display panel designed to be attached to an appliance or the like thereby permitting the printed circuit board to be thinner than would otherwise be possible.

23. The light emitting module of claim 22, wherein a combined thickness of the support and back plates necessary to support the light emitting device is about the same as a thickness of a back plate without the support plate necessary to support the light emitting device.