Display device, display method, and color separation device

Patent metadata

Field	Value
Publication number	US-10514570-B2
Application number	US-201815912007-A
Country	US
Kind code	B2
Filing date	Mar 5, 2018
Priority date	Mar 3, 2017
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

According to one embodiment, a display device includes a first arrangement layer and a second arrangement layer. The first layer includes a first pixel, a second pixel, and a third pixel are arranged periodically in one direction. The second layer is opposed to the first layer, and the second layer includes a first element, a second element, and a third element which are arranged periodically to correspond to the first pixel, the second pixel, and the third pixel, respectively, and separate emission light to light of wavelength corresponding to a first color, light of wavelength corresponding to a second color, and light of wavelength corresponding to a third color to be emitted on the first pixel, the second pixel, and the third pixel, respectively.

First claim

What is claimed is:

1. A display device comprising:
a first arrangement layer including a first pixel, a second pixel, a third pixel, a fourth pixel, and a fifth pixel; and
a second arrangement layer including a first element, a second element, and a third element, wherein
the first pixel is arranged between the fourth pixel and the second pixel in a first direction,
the third pixel is arranged between the second pixel and the fifth pixel in the first direction,
the first element is opposed to the first pixel in a thickness direction, and configured to diffract light of a first color wavelength to the first pixel, light of a second color wavelength to the second pixel, and light of a third color wavelength to the fourth pixel,
the second element is opposed to the second pixel in the thickness direction, and configured to diffract the light of the first color wavelength to the first pixel, the light of the second color wavelength to the second pixel, and the light of the third color wavelength to the third pixel, and
the third element is opposed to the third pixel in the thickness direction, and configured to diffract the light of the first color wavelength to the fifth pixel, the light of the second color wavelength to the second pixel, and the light of the third color wavelength to the third pixel.

2. The display device according to claim 1 , wherein the first element, second element, and third element of the second arrangement layer are each formed of a transparent dielectric material.

3. The display device according to claim 1 , wherein the first arrangement layer includes a diffusion plate layer in a light transmissive surface side.

4. The display device according to claim 1 , wherein
the second arrangement layer further comprises a fourth element and a fifth element,
the fourth element is opposed to the fourth pixel and configured to diffract the light of the first color wavelength to the first pixel, and
the fifth element is opposed to the fifth pixel and configured to diffract the light of the third color wavelength to the third pixel.

5. The display device according to claim 4 , wherein
the first arrangement layer further includes a sixth pixel adjacent to the first pixel in a second direction in a second direction crossing the first direction,
the second arrangement layer further includes a sixth element opposed to the sixth pixel,
the first element and the sixth element have a same structure, and
the sixth element is configured to diffract the light of the first color wavelength to the sixth pixel.

6. The display device according to claim 1 , wherein
the first element includes a first structure,
the second element includes a second structure,
the third element includes a third structure, and
the first structure, the second structure, and the third structure are different from each other.

7. The display device according to claim 6 , wherein
the first structure comprises a plurality of first protruding portions,
the second structure comprises a plurality of second protruding portions, and
the third structure comprises a plurality of third protruding portions.

8. The display device according to claim 7 , wherein
an average value of widths of the plurality of first protruding portions is greater than or equal to an average value of widths of the plurality of second protruding portions, in the first direction, and
the average value of widths of the plurality of first protruding portions is less than or equal to an average value of widths of the plurality of third protruding portions, in the first direction.

9. The display device according to claim 7 , wherein
a number of the plurality of first protruding portions is greater than or equal to a number of the plurality of second protruding portions, and
the number of the plurality of first protruding portions is less than or equal to a number of the plurality of third protruding portions.

10. The display device according to claim 7 , wherein
a difference between a maximum height and a minimum height of the plurality of first protruding portions is less than or equal to a difference between a maximum height and a minimum height of the plurality of second protruding portions, and
the difference between the maximum height and the minimum height of the plurality of first protruding portions is less than or equal to a difference between a maximum height and a minimum height of the plurality of third protruding portions.

11. The display device according to claim 1 , wherein
the first element, the second element, and the fourth element diffract the light of the first color wavelength to be gathered at the first pixel,
the first element, the second element, and the third element diffract the light of the second color wavelength to be gathered at the second pixel, and
the second element, the third element, and the fifth element diffract the light of the third color wavelength to be gathered at the third pixel.

12. The display device according to claim 1 , wherein
the first color wavelength is greater than the second color wavelength, and
the second color wavelength is greater than the third color wavelength.

13. The display device according to claim 1 , further comprising a first polarizer layer arranged between the first arrangement layer and the second arrangement layer.

14. The display device according to claim 1 , further comprising:
a first polarizer layer, wherein
the first arrangement layer includes a first substrate layer, and
the second arrangement layer is disposed between the first polarizer layer and the first substrate layer.

15. A display device comprising:
a first arrangement layer including a first pixel, a second pixel, a third pixel, a fourth pixel, and a fifth pixel; and
a second arrangement layer including a first element opposed to the first pixel, a second element opposed to the second pixel, a third element opposed to the third pixel, a fourth element opposed to the fourth pixel, and a fifth element opposed to the fifth pixel, in a thickness direction, wherein
the first pixel is arranged between the fourth pixel and the second pixel in a first direction,
the third pixel is arranged between the second pixel and the fifth pixel in the first direction,
the first element, the second element, and the fourth element are configured to diffract light of a first color wavelength to be gathered at the first pixel,
the first element, the second element, and the third element are configured to diffract light of a second color wavelength to be gathered at the second pixel, and
the second element, the third element, and the fifth element are configured to diffract light of a third color wavelength to be gathered at the third pixel.

16. A color separation device for arrangement with a pixel arrangement layer including a first pixel, a second pixel, a third pixel, a fourth pixel, and a fifth pixel, the first pixel arranged between the fourth pixel and the second pixel in a first direction, and the third pixel arranged between the second pixel and the fifth pixel in the first direction, the color separation device comprising:
a first element opposed to the first pixel and configured to diffract light of a first color wavelength to the first pixel, light of a second color wavelength to the second pixel, and light of a third color wavelength to the fourth pixel;
a second element opposed to the second pixel and configured to diffract the light of the first color wavelength to the first pixel, the light of the second color wavelength to the second pixel, and the light of the third colo

Assignees

• Japan Display Inc

Inventors

• Nakaoka Chikyu
• Kabe Masaaki
• Yata Tatsuya
• Ikeda Kojiro

Classifications

• G02F1/133621

  providing coloured light (G02F1/133617, G02F1/133533 take precedence) · CPC title

• G02B6/29316

  Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide (G02B6/02057, G02B6/29332, G02B6/29356 take precedence) · CPC title

• G02B6/34

  utilising prism or grating {(G02B6/293 takes precedence)} · CPC title

• G02F1/1326

  Liquid crystal optical waveguides or liquid crystal cells specially adapted for gating or modulating between optical waveguides · CPC title

• G02F2201/123

  pixel · CPC title