Liquid crystal display device and electronic device

Patent metadata

Field	Value
Publication number	US-12007644-B2
Application number	US-202117907425-A
Country	US
Kind code	B2
Filing date	Mar 23, 2021
Priority date	Apr 6, 2020
Publication date	Jun 11, 2024
Grant date	Jun 11, 2024

Abstract

Provided is a liquid crystal display device that includes a first substrate including a microlens corresponding to each pixel, a second substrate disposed to face the first substrate, and a liquid crystal material layer sandwiched between the first substrate and the second substrate. A first transparent material layer including a material having a first refractive index is formed in the first substrate, and a material having a second refractive index different from the first refractive index is disposed in a portion of the first transparent material layer corresponding to a region between adjacent pixels. A second transparent material layer including a material having a third refractive index is formed in the second substrate, and a material having a fourth refractive index different from the third refractive index is disposed in a portion of the second transparent material layer corresponding to the region between the adjacent pixels.

First claim

The invention claimed is:

1. A liquid crystal display device, comprising:
a first substrate that includes a microlens corresponding to each pixel;
a second substrate that faces the first substrate; and
a liquid crystal material layer sandwiched between the first substrate and the second substrate, wherein
a first transparent material layer is in the first substrate and includes a material that has a first refractive index,
a material that has a second refractive index different from the first refractive index is in a portion of the first transparent material layer corresponding to a region between adjacent pixels,
a second transparent material layer is in the second substrate and includes a material that has a third refractive index,
a material that has a fourth refractive index different from the third refractive index is in a portion of the second transparent material layer corresponding to the region between the adjacent pixels,
a third transparent material layer is on the first transparent material layer in the first substrate and includes a material that has a fifth refractive index higher than the second refractive index,
the material that has the second refractive index is embedded in a first groove,
the first groove is in portions of the first transparent material layer and the third transparent material layer corresponding to the region between the adjacent pixels, and
the adjacent pixels include the pixel.

2. The liquid crystal display device according to claim 1 , wherein the first transparent material layer is between the microlens and the liquid crystal material layer.

3. The liquid crystal display device according to claim 1 , wherein the second refractive index is smaller than the first refractive index.

4. The liquid crystal display device according to claim 1 , wherein the material that has the second refractive index is in a form of a lattice.

5. The liquid crystal display device according to claim 4 , wherein the material that has the second refractive index widens at an intersection portion of the lattice.

6. The liquid crystal display device according to claim 1 , wherein the material that has the first refractive index is one of a silicon nitride or a silicon oxynitride.

7. The liquid crystal display device according to claim 1 , wherein the material that has the second refractive index is a silicon oxide.

8. The liquid crystal display device according to claim 1 , wherein a multilayer laminate film is between the microlens and the first transparent material layer and includes a high refractive index material film and a low refractive index material film.

9. The liquid crystal display device according to claim 8 , wherein the multilayer laminate film includes a silicon nitride film and a silicon oxide film.

10. The liquid crystal display device according to claim 1 , wherein the fourth refractive index is smaller than the third refractive index.

11. The liquid crystal display device according to claim 1 , wherein the material that has the fourth refractive index is in a form of a lattice.

12. The liquid crystal display device according to claim 11 , wherein the material that has the fourth refractive index widens at an intersection portion of the lattice.

13. The liquid crystal display device according to claim 1 , wherein the material that has the third refractive index is one of a silicon nitride or a silicon oxynitride.

14. The liquid crystal display device according to claim 1 , wherein the material that has the fourth refractive index is a silicon oxide.

15. The liquid crystal display device according to claim 1 , wherein
a transparent common electrode is in the first substrate, and
a transparent pixel electrode corresponding to each pixel is in the second substrate.

16. The liquid crystal display device according to claim 15 , wherein the second substrate has a lattice-shaped light shielding region located in a portion corresponding to the region between the adjacent pixels.

17. The liquid crystal display device according to claim 1 , wherein
a plurality of transparent electrodes extending in a first direction is in the first substrate, and
a plurality of transparent electrodes extending in a second direction different from the first direction is in the second substrate.

18. The liquid crystal display device according to claim 1 , wherein
a side wall of the first groove in the first transparent material layer is inclined at a first inclination angle from a direction perpendicular to an interface between the first transparent material layer and the third transparent material layer, and
a side wall of the first groove in the third transparent material layer is inclined at a second inclination angle larger than the first inclination angle from the perpendicular direction.

19. The liquid crystal display device according to claim 1 , wherein the third transparent material layer has a film thickness of larger than 0 nm and smaller than 200 nm.

20. The liquid crystal display device according to claim 1 , wherein
the first transparent material layer is a silicon oxynitride film, and
the third transparent material layer is a silicon nitride film.

21. The liquid crystal display device according to claim 1 , wherein the third transparent material layer is one of etched or polished at a slower speed than the first transparent material layer.

22. The liquid crystal display device according to claim 1 , wherein
a fourth transparent material layer is on the second transparent material layer in the second substrate and includes a material that has a sixth refractive index higher than the fourth refractive index,
the material that has the fourth refractive index is embedded in a second groove, and
the second groove is in portions of the second transparent material layer and the fourth transparent material layer corresponding to the region between the adjacent pixels.

23. The liquid crystal display device according to claim 22 , wherein
a side wall of the second groove in the second transparent material layer is inclined at a third inclination angle from a direction perpendicular to an interface between the second transparent material layer and the fourth transparent material layer, and
a side wall of the second groove in the fourth transparent material layer is inclined at a fourth inclination angle larger than the third inclination angle from the perpendicular direction.

24. The liquid crystal display device according to claim 22 , wherein the fourth transparent material layer has a film thickness of larger than 0 nm and smaller than 200 nm.

25. The liquid crystal display device according to claim 22 , wherein
the second transparent material layer is a silicon oxynitride film, and
the fourth transparent material layer is a silicon nitride film.

26. The liquid crystal display device according to claim 22 , wherein the fourth transparent material layer is one of etched or polished at a slower speed than the second transparent material layer.

27. An electronic device, comprising:
a liquid crystal display device that includes:
a first substrate that includes a microlens corresponding to each pixel;
a second substrate that faces the first substrate; and
a liquid crystal material layer sandwiched between the first substrate and the second substrate, wherein
a first transparent material layer is in the first substrate and includ

Assignees

• Sony Semiconductor Solutions Corp
• Sony Group Corp

Inventors

• Nakano Shintaro
• Okazaki Tsuyoshi

Classifications

• G02F2201/123

  pixel · CPC title

• G02F2201/121

  common or background · CPC title

• G02F1/13439

  characterised by their electrical, optical, physical properties; materials therefor; method of making · CPC title

• G02F1/13363

  Birefringent elements, e.g. for optical compensation · CPC title

• G02F1/133567

  on the back side · CPC title