Electroluminescent display

• US 8,026,872 B2
• Filed: 05/17/2007
• Issued: 09/27/2011
• Est. Priority Date: 10/30/2006
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Wei, Mao-Kuo, Chen, Kuan-Yu, Lin, Hoang-Yan, Lee, Jiun-Haw, Li, Shi-Hao, Ho, Yu-Hsuan, Hsu, Sheng-Chih, Chao, Ching-Ian
• Primary Examiner(s): Awad; Amr
• Assistant Examiner(s): Moorad; Waseem
• Application Number:
  US11/750,317
• Publication Number:
  US 20080100540A1
• Time in Patent Office: 1,594 Days
• Field of Search: 345 76- 77
• US Class Current: 345/76
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 59/879 comprising refractive means, e.g. lenses

Abstract

An electroluminescent display includes an electroluminescent panel, and at least one brightness enhanced film. The electroluminescent panel has a plurality of sub-pixels, and at least one illumination surface. The brightness enhanced film is disposed on the at least one illumination surface. The brightness enhanced film has a plurality of micro lenses, and the width of the micro lens is smaller than half of the minimum width of the sub-pixels.

Claims

1. An electroluminescent display, comprising:

an electroluminescent panel having a plurality of sub-pixels and at least one illumination surface, wherein the plurality of sub-pixels comprise a plurality of red sub-pixels, green sub-pixels and blue sub-pixels, and the sub-pixels having the same color are arranged in the same direction; and

at least one brightness enhanced film having a plurality of micro lenses, disposed on the at least one illumination surface, wherein each of the plurality of micro lenses has a width smaller than half of the minimum width of each of the plurality of sub-pixels, the micro lens has a major axis direction and a minor axis direction substantially intersected to the major axis direction, a projection shape of each of the plurality of micro lenses projected on the illumination surface has two straight sides opposite to each other, a cross-sectional shape of each of the plurality of the micro lens along the minor axis direction is a semicircular shape, and the major axis direction is substantially parallel to the arranged direction of the sub-pixels having the same color, wherein a distance exists between two adjacent micro lenses.

2. The electroluminescent display of claim 1, wherein a width of each of the micro lens is a diameter of the semicircular shape.

3. The electroluminescent display of claim 1, wherein each of the micro lenses has a length substantially parallel to the major axis direction, and the length of the micro lens is smaller than the width of each sub-pixel.

4. The electroluminescent display of claim 1, wherein the distance exists between two adjacent, micro lenses is substantially 5 microns.

5. The electroluminescent display of claim 1, wherein the plurality of micro lenses are arranged in a rectangular array.

6. The electroluminescent display of claim 1, wherein the plurality of micro lenses are arranged in a square array.

7. The electroluminescent display of claim 1, wherein each of the plurality of sub-pixels is a rectangular area, and the minimum width of the plurality of sub-pixels is the width of the rectangular area.

8. The electroluminescent display of claim 1, wherein the electroluminescent panel comprises an organic light emitting diode panel or a polymer light emitting diode panel.

9. The electroluminescent display of claim 1, wherein the brightness enhanced film is adhered to the surface of the at least one illumination surface of the electroluminescent panel.

10. The electroluminescent display of claim 1, wherein the projection shape of each of the plurality of micro lenses projected on the illumination surface is a quadrangle.

11. The electroluminescent display of claim 10, wherein the two straight sides of the quadrangle are substantially parallel to the major axis direction.

12. The electroluminescent display of claim 1, wherein the projection shape of each of the plurality of micro lens projected on the illumination surface further has two curved sides opposite to each other and connected to the two straight sides.

13. The electroluminescent display of claim 1, wherein the major axis direction substantially parallel to the arranged direction of the sub-pixels having the same color is capable of reducing blur effects.