LIGHT EMITTING DIODE DISPLAY DEVICE

• US 20090213585A1
• Filed: 08/15/2008
• Published: 08/27/2009
• Est. Priority Date: 02/22/2008
• Status: Abandoned Application

• Current Assignee: Foxsemicon Integrated Technology Incorporated
• Original Assignee: Foxsemicon Integrated Technology Incorporated
• Inventors: YEH, CHIEN-LIANG, TU, JIA-JIN, CHERN, JYH-LONG, WANG, CHUN-WEI
• Application Number:
  US12/192,374
• Publication Number:
  US 20090213585A1
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: G02B 19/0014 at least one surface having optical power
• CPC Class Codes: G02B 19/0028 refractive and reflective surfaces, e.g. non-imaging catadioptric systems
• CPC Class Codes: G02B 19/0066 in the form of an LED array
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes

Abstract

A light emitting diode display device includes a circuit board and a plurality of pixel units. Each pixel unit includes a light emitting diode assembly positioned on and electrically connected to the circuit board, and a light-mixed component positioned on a side of the light emitting diode assembly configured for mixing lights emitted from the light emitting diode assembly to generate a mixed light beam.

Claims

1. A light emitting diode display device comprising:

A circuit board; and

a plurality of pixel units, wherein each pixel unit comprises a light emitting diode assembly positioned on and electrically connected to the circuit board, and a light-mixed component positioned on a side of the light emitting diode assembly configured for mixing lights emitted from the light emitting diode assembly to generate a mixed light beam.

2. The light emitting diode display device of claim 1, wherein each pixel unit further comprises a light-modified component positioned on a side of the light-mixed component configured for modifying optical paths of the mixed light beam.

3. The light emitting diode display device of claim 1, wherein the light-mixed component comprises a reflective inner surface, a light input face, and a light output face opposite and parallel to the light input face;

the light input face is positioned adjacent to the light emitting diode assembly.

4. The light emitting diode display device of claim 3, wherein each pixel unit further comprises a focusing lens positioned on a side of the light-mixed component configured for focusing the mixed light beam.

5. The light emitting diode display device of claim 4, wherein the focusing lens is attached to the light output face using refractive index matching glue.

6. The light emitting diode display device of claim 1, wherein the light-mixed component comprises a reflective inner surface, a light input face and a light output face opposite and forming an oblique angle with the light input face.

7. The light emitting diode display device of claim 1, wherein the light-mixed component comprises an elliptical wall and a first focus point;

the light emitting diode assembly is positioned at the first focus point.

8. The light emitting diode display device of claim 7, wherein each pixel unit further comprises a light-modified component positioned on a side of the light-mixed component;

the light-modified component includes a paraboloidal wall and a third focus point;

the light-mixed component includes a second focus point that overlaps the third focus.

9. The light emitting diode display device of claim 1, wherein the light-mixed component is a lens array that comprises a plurality of micro-lenses.

10. The light emitting diode display device of claim 9, wherein each micro-lens is a concave-convex bicylindrical lens, a biconvex bicylindrical lens, or a planar-convex cylindrical lens.

11. The light emitting diode display device of claim 9, wherein each pixel unit further comprises a biconvex lens positioned on a side of the lens array.

12. The light emitting diode display device of claim 1, wherein the light-mixed component is a total internal reflection lens.

13. The light emitting diode display device of claim 12, wherein each pixel unit further comprises a microstructure array that is positioned on a side of the total internal reflection lens, the microstructure array includes a plurality of microstructures formed in shapes of right-triangle.

14. The light emitting diode display device of claim 13, wherein each microstructure has a height less than 300 micrometers;

a distance between the tips of a pair of adjacent microstructures is less than 400 micrometers.

15. The light emitting diode display device of claim 1, wherein the light-mixed component is a light diffusion board that is made of a transparent material with a refractive index more than 1.4.

16. The light emitting diode display device of claim 15, wherein the light diffusion board is distributed with light diffusion particles.

17. The light emitting diode display device of claim 16, wherein the light diffusion particles are made of transparent material and have a diameter less than 500 micrometers.

18. The light emitting diode display device of claim 15, wherein the light diffusion board comprises a light input face which has a rough surface for diffusing lights emitted from the light emitting diode assembly.

19. The light emitting diode display device of claim 15, wherein each pixel unit further comprises a plurality of microstructures positioned on a side of the light-diffusing board;

each microstructure is right-triangular shaped.

20. The light emitting diode display device of claim 19, wherein each microstructure has a height less than 300 micrometers;

a distance between the tips of a pair of adjacent microstructures is less than 400 micrometers.