Image display device using diffractive lens

Patent metadata

Field	Value
Publication number	US-9354451-B2
Application number	US-201514728711-A
Country	US
Kind code	B2
Filing date	Jun 2, 2015
Priority date	Mar 17, 2010
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

The present invention relates to an image display device using a diffractive lens. An image display device according to an exemplary embodiment of the present invention includes a display panel displaying an image, and a diffractive lens for the image of the display panel to be recognized as a two-dimensional (2D) image or a three-dimensional (3D) image, wherein the diffractive lens modifies a path of light by using an optical principle of a Fresnel zone plate.

First claim

What is claimed is:

1. An image display device, comprising:
a display panel to display an image; and
an optical modifier disposed on the display panel to modify a light path of the image,
wherein:
the optical modifier comprises:
a first electrode layer disposed on a first substrate;
a second electrode layer facing the first electrode layer; and
a liquid crystal layer interposed between the first electrode layer and the second electrode layer;

the first electrode layer comprises:
a first electrode array comprising a plurality of first electrodes;
an insulating layer disposed on the first electrode array; and
a second electrode array comprising a plurality of second electrodes, the second electrode array being disposed on the insulating layer; and

a width of at least one selected from the group consisting of the first electrodes and the second electrodes is greater than or substantially equal to a cell-gap of the liquid crystal layer.

2. The image display device of claim 1 , wherein the first electrodes and the second electrodes are alternately disposed.

3. The image display device of claim 2 , wherein the second electrode layer is disposed on a second substrate facing the first substrate, the second electrode layer comprising a common electrode.

4. The image display device of claim 2 , wherein:
the optical modifier includes a plurality of zones, each zone comprising at least one of the first electrodes and at least one of the second electrodes; and
the optical modifier is configured so that voltages applied to the at least one of the first electrodes and the at least one of the second electrodes that are included in each zone and adjacent to each other are varied in each zone.

5. The image display device of claim 2 , wherein:
the optical modifier includes a plurality of zones, each zone comprising at least two of the first electrodes and at least two of the second electrodes; and
a voltage applied to at least one of the at least two of the first electrodes is the same as a voltage applied to at least one of the at least two of the second electrodes in at least one of the zones.

6. The image display device of claim 2 , wherein at least a portion of at least one of the first electrodes overlaps at least a portion of at least one of the second electrodes adjacent to the at least one of the first electrodes.

7. The image display device of claim 2 , wherein widths of all of the first electrodes and the second electrodes are greater than or substantially equal to the cell-gap of the liquid crystal layer.

8. The image display device of claim 2 , wherein:
the optical modifier forms a diffractive lens having a center; and
widths of the first electrodes and widths of the second electrodes are increased as closer to the center of the diffractive lens.

9. The image display device of claim 2 , wherein the cell-gap is less than about 5 μm.

10. The image display device of claim 2 , wherein a width of the at least one of the first electrodes is the same as a width of the at least one the second electrodes.

11. The image display device of claim 2 , wherein the optical modifier is configured so that the first electrodes, the second electrodes, and the second electrode layer are applied with a same voltage in a 2D mode.

12. The image display device of claim 1 , wherein the second electrode layer is disposed on a second substrate facing the first substrate, the second electrode layer comprising a common electrode.

13. The image display device of claim 1 , wherein:
the optical modifier includes a plurality of zones, each zone comprising at least one of the first electrodes and at least one of the second electrodes; and
the optical modifier is configured so that voltages applied to the at least one of the first electrodes and the at least one of the second electrodes that are included in each zone and adjacent to each other are varied in each zone.

14. The image display device of claim 13 , wherein at least a portion of at least one of the first electrodes overlaps at least a portion of at least one of the second electrodes adjacent to the at least one of the first electrodes.

15. The image display device of claim 13 , wherein widths of all of the first electrodes and the second electrodes are greater than or substantially equal to the cell-gap of the liquid crystal layer.

16. The image display device of claim 13 , wherein:
the optical modifier forms a diffractive lens having a center; and
widths of the first electrodes and widths of the second electrodes are increased as closer to the center of the diffractive lens.

17. The image display device of claim 13 , wherein the cell-gap is less than about 5 μm.

18. The image display device of claim 13 , wherein a width of the at least one of the first electrodes is the same as a width of the at least one the second electrodes.

19. The image display device of claim 13 , wherein the optical modifier is configured so that the first electrodes, the second electrodes, and the second electrode layer are applied with a same voltage in a 2D mode.

20. The image display device of claim 1 , wherein:
the optical modifier includes a plurality of zones, each zone comprising at least two of the first electrodes and at least two of the second electrodes; and
a voltage applied to at least one of the at least two of the first electrodes is the same as a voltage applied to at least one of the at least two of the second electrodes in at least one of the zones.

21. The image display device of claim 20 , wherein at least a portion of at least one of the first electrodes overlaps at least a portion of at least one of the second electrodes adjacent to the at least one of the first electrodes.

22. The image display device of claim 20 , wherein widths of all of the first electrodes and the second electrodes are greater than or substantially equal to the cell-gap of the liquid crystal layer.

23. The image display device of claim 20 , wherein:
the optical modifier forms a diffractive lens having a center; and
widths of the first electrodes and widths of the second electrodes are increased as closer to the center of the diffractive lens.

24. The image display device of claim 20 , wherein a width of the at least one of the first electrodes is the same as a width of the at least one the second electrodes.

25. The image display device of claim 20 , wherein the optical modifier is configured so that the first electrodes, the second electrodes, and the second electrode layer are applied with a same voltage in a 2D mode.

26. The image display device of claim 1 , wherein at least a portion of at least one of the first electrodes overlaps at least a portion of at least one of the second electrodes adjacent to the at least one of the first electrodes.

27. The image display device of claim 26 , wherein widths of all of the first electrodes and the second electrodes are greater than or substantially equal to the cell-gap of the liquid crystal layer.

28. The image display device of claim 26 , wherein:
the optical modifier forms a diffractive lens having a center; and
widths of the first electrodes and widths of the second electrodes are increased as closer to the center of the diffractive lens.

29. The image display device of claim 26 , wherein the optical modifier is configured so that the first electrodes, the

Assignees

• Samsung Display Co Ltd
• Samsung Display Co Ltd

Inventors

• Jeong seung jun
• Jung Kyung-Ho
• Lee Seung-Hoon
• Kim Hee-Seop
• Yun Hae-Young
• Kim Hwi
• Kim Il-Joo
• Kim Kyung-Bae
• Yi Jung-Hwan

Classifications

• H04N13/356

  having separate monoscopic and stereoscopic modes · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G02F1/29

  for the control of the position or the direction of light beams, i.e. deflection · CPC title

• H04N13/359

  Switching between monoscopic and stereoscopic modes · CPC title

• G02B30/36

  using refractive optical elements, e.g. prisms, in the optical path between the images and the observer · CPC title