Liquid crystal display device using holographic diffuser
View Patent ↗A liquid crystal display device includes a liquid crystal cell, a first polarizer under the liquid crystal cell, a backlight under the first polarizer, and a holographic diffuser over the liquid crystal cell. The holographic diffuser includes a spacer and a diffusing layer over the spacer. The spacer includes an open portion and a lower surface of the diffusing layer includes a holographic pattern.
1. A liquid crystal display device, comprising:
a liquid crystal cell;
a first polarizer;
a second polarizer;
a backlight under the first polarizer; and
a holographic diffuser over the liquid crystal cell, the holographic diffuser including a spacer and a diffusing layer over the spacer, wherein the spacer includes an open portion and a topography of a lower surface of the diffusing layer includes a holographic pattern.
2. The device according to claim 1 , wherein the first polarizer is under the liquid crystal cell.
3. The device according to claim 1 , wherein the second polarizer is over the holographic diffuser.
4. The device according to claim 1 , wherein the liquid crystal cell further comprises:
a first substrate having a first surface; and
a second substrate having a second surface, facing the first surface.
5. The device according to claim 4 , wherein the liquid crystal cell further comprises:
a first plurality of electrodes formed on the first surface; and
a second plurality of electrodes formed on the second surface.
6. The device according to claim 5 , wherein the liquid crystal cell further comprises liquid crystal material between the first and second plurality of electrodes.
7. The device according to claim 5 , wherein the first polarizer is between the first substrate and the first plurality of electrodes.
8. The device according to claim 5 , wherein the second polarizer is between the second substrate and the second plurality of electrodes.
9. The device according to claim 6 , wherein the first polarizer is between the first plurality of electrodes and the liquid crystal material.
10. The device according to claim 6 , wherein the second polarizer is between the second plurality of electrodes and the liquid crystal material.
11. The device according to claim 1 , wherein the spacer contacts a periphery of the diffusing layer.
12. The device according to claim 1 , wherein the spacer has a first thickness; and the holographic pattern has a second thickness, less than the first thickness.
13. The device according to claim 1 , wherein air is arranged within the open portion.
14. The device according to claim 13 , wherein the diffusing layer has a different refractive index from the air.
15. The device according to claim 1 , wherein the diffusing layer is formed from an organic resin.
16. The device according to claim 1 , wherein the diffusing layer has a refractive index between about 1.1 and about 1.9.
17. The device according to claim 1 , wherein the diffusing layer has a refractive index of about 1.5.
18. The device according to claim 1 , wherein the spacer is formed from a polyester.
19. The device according to claim 1 , wherein the spacer has a thickness between about 0.3 μm and about 100 μm.
20. The device according to claim 1 , wherein the diffusing layer is formed on the second polarizer.
21. The device according to claim 1 , further comprising a retardation plate between the second polarizer and the holographic diffuser.
22. The device according to claim 21 , wherein the diffusing layer is formed on the retardation plate.
23. The device according to claim 1 , wherein the spacer is attached to the diffusing layer and the liquid crystal cell via adhesive material.
24. A liquid crystal display device, comprising:
a liquid crystal cell having first and second surfaces opposite to each other;
a spacer contacting a periphery of the first surface of the liquid crystal cell;
a diffusing layer over the spacer, wherein the spacer completely separates the diffusing layer from the first surface of the liquid crystal cell; and
a backlight unit near the second surface of the liquid crystal cell, wherein the liquid crystal cell is between the backlight unit and the diffusing layer.
25. A liquid crystal display device, comprising:
a backlight unit;
a liquid crystal cell over the backlight unit; and
a diffusing layer over the liquid crystal cell, wherein the diffusing layer and the liquid crystal cell are separated from each other by air and a spacer at a periphery of the diffusing layer and wherein the liquid crystal cell is between the backlight unit and the diffusing layer.
26. A display device, comprising:
a display panel with first surface facing a viewer;
a spacer contacting a periphery of the first surface of the display panel; and
a diffusing layer having a holographic pattern over the spacer, wherein an air gap is formed between the diffusing layer and the first surface of the display panel due to a height of the spacer and wherein the spacer completely separates the diffusing layer from the first surface of the display panel.