Luminance enhancement structure with varying pitches
First Claim
1. A display device assembly comprisingi) a display device comprising display cells filled with a display fluid, and a substrate layer above the display cells, andii) a luminance enhancement structure between a viewing side and the substrate layer, wherein the luminance enhancement structure comprises columns and grooves in an alternating order, anda) each of said columns has a planar top surface having a width;
- b) each of said grooves has a triangular cross-section and an apex angle, wherein said triangular cross-section has an open side having a width; and
c) said structure has pitches varying between about 1% to about 25% within the structure, wherein each of the pitches is the sum of the width of the open side of the triangular cross-section of the groove and the width of the planar top surface of a neighboring column and the difference between the widest pitch and the narrowest pitch within the luminance enhancement structure is at least 1 μ
m, and said substrate layer is in contact with the planar top surfaces of the columns in the luminance enhancement structure;
wherein an external light from above the luminance enhancement structure strikes a tilted surface of the grooves of the luminance enhancement structure and then the light is reflected by total internal reflection instead of transmitting through the space within the groove.
3 Assignments
0 Petitions
Accused Products
Abstract
The present invention is directed to luminance enhancement structure for reflective display devices. The luminance enhancement structure comprises columns and grooves, wherein said grooves have a triangular cross-section and the pitches of the structure vary. The structure not only can enhance the brightness of a display device, but also can reduce the Moiré effect of the display device.
101 Citations
17 Claims
-
1. A display device assembly comprising
i) a display device comprising display cells filled with a display fluid, and a substrate layer above the display cells, and ii) a luminance enhancement structure between a viewing side and the substrate layer, wherein the luminance enhancement structure comprises columns and grooves in an alternating order, and a) each of said columns has a planar top surface having a width; -
b) each of said grooves has a triangular cross-section and an apex angle, wherein said triangular cross-section has an open side having a width; and c) said structure has pitches varying between about 1% to about 25% within the structure, wherein each of the pitches is the sum of the width of the open side of the triangular cross-section of the groove and the width of the planar top surface of a neighboring column and the difference between the widest pitch and the narrowest pitch within the luminance enhancement structure is at least 1 μ
m, and said substrate layer is in contact with the planar top surfaces of the columns in the luminance enhancement structure;wherein an external light from above the luminance enhancement structure strikes a tilted surface of the grooves of the luminance enhancement structure and then the light is reflected by total internal reflection instead of transmitting through the space within the groove. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
Specification