REFLECTIVE DISPLAY DEVICES WITH LUMINANCE ENHANCEMENT FILM

• US 20100271407A1
• Filed: 04/20/2010
• Published: 10/28/2010
• Est. Priority Date: 04/22/2009
• Status: Active Grant

• Current Assignee: E Ink Corporation (E Ink Holdings Incorporated)
• Original Assignee: E Ink California, LLC (E Ink Holdings Incorporated)
• Inventors: Sprague, Robert A., Lin, Craig, Chan, Bryan, Ho, Andrew
• Granted Patent: US 8,714,780 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G09G 2300/023 Display panel composed of stacked panels
• CPC Class Codes: G09G 3/344 based on particles moving in a fluid or in a gas, e.g. electrophoretic devices electrophoretic devices per se G02F1/167

Abstract

The present invention is directed to reflective display devices with a luminance enhancement structure on its viewing side and at least an auxiliary layer and/or edge sealing. The structure increases the overall reflectance by reducing the total internal reflection, and as a result, the brightness of a display device is increased.

Claims

1. A display assembly comprising:

(a) a display panel which comprises an array of display cells filled with a display fluid;

(b) a luminance enhancement structure on the viewing side of the display device, wherein said luminance structure comprises columns and grooves in alternating order and each of said grooves has a cross-section comprising an apex angle and two edge lines; and

at least one of (c) and (d);

(c) at least an auxiliary layer; and

(d) edging sealing.

2. The assembly of claim 1, wherein said auxiliary layer is an anti-scratch layer, an anti-glare layer, a moisture protection barrier layer, a touch panel, a UV filter adhesive layer, an optical clear adhesive layer or a hard coat layer.

3. The assembly of claim 1, wherein said luminance enhancement structure has a one dimensional configuration.

4. The assembly of claim 1, wherein said luminance enhancement structure has a two dimensional configuration.

5. The assembly of claim 3, wherein said two edge lines are straight lines and the apex angles of the grooves are substantially equal throughout the structure.

6. The assembly of claim 3, wherein the two edge lines are straight lines and the apex angles of the grooves vary.

7. The assembly of claim 3, wherein the two edge lines comprise two or more segments of straight line and the different segments of the straight line have different edge line angles.

8. The assembly of claim 7, wherein the edge lines appear curved.

9. The assembly of claim 8, wherein the curved edge lines have more than one curvature.

10. The assembly of claim 7, wherein the two edge lines of a single groove have different numbers of segments of the straight line.

11. The assembly of claim 1, wherein said apex angle is in the range of about 5°

to about 50°

.

12. The assembly of claim 11, wherein said apex angle is in the range of about 20°

to about 40°

.

13. The assembly of claim 1, wherein the surface of the grooves is not coated.

14. The assembly of claim 1, further comprising a common electrode layer and a backplane.