DISPLAY DEVICE

• US 20180252970A1
• Filed: 01/23/2018
• Published: 09/06/2018
• Est. Priority Date: 03/03/2017
• Status: Abandoned Application

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: IWAKABE, Yasushi, HIROSAWA, Jin, IGETA, Koichi
• Application Number:
  US15/877,699
• Publication Number:
  US 20180252970A1
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 3/001 using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background slide projectors per se G03B23/00 = 42 HP
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A display device includes: a light shielding film; a plurality of image lines and a plurality of scanning lines present on an insulating base material; a pixel electrode and a common electrode present in a sub-pixel area surrounded by the plural image lines and the plural scanning lines in a plan view; and a liquid crystal layer driven by an electric field generated between the pixel electrode and the common electrode. A shape of the pixel electrode in a light transmission area surrounded by the light shielding film is a linear shape having no bending portion. The common electrode is overlapped on the plural image lines and the plural scanning lines, and has an opening overlapped on the pixel electrode. Further, each liquid crystal molecule of the liquid crystal layer has a positive dielectric constant. The sub-pixel area has a width of 13 μm or less.

Claims

1. A display device comprising:

an insulating base material;

a plurality of image lines and a plurality of scanning lines over the insulating base material;

a light shielding film overlapped on the image lines and the scanning lines;

a first electrode and a second electrode present in at least one sub-pixel area surrounded by the image lines and the scanning lines in a plan view; and

a liquid crystal layer driven by an electric field generated between the first and second electrodes,

wherein a shape of the first electrode in a light transmission area overlapped by the light shielding film is a linear shape having no bending portion,

the second electrode is overlapped on the image lines and the scanning lines, and has an opening overlapped on the first electrode,

each liquid crystal molecule in the liquid crystal layer has a positive dielectric constant, and

the sub-pixel area has a width of 13 μ

m or less.

2. The display device according to claim 1, further comprising an insulating layer between the first and second electrodes,

wherein the second electrode is present between the insulating layer and the liquid crystal layer.

3. The display device according to claim 1,

wherein the first electrode is a pixel electrode, and the second electrode is a common electrode formed over the plural sub-pixel areas.

4. The display device according to claim 1,

wherein the first and second electrodes in the light transmission area is not overlapped.

5. The display device according to claim 1,

wherein the liquid crystal layer has a thickness of 2.8 μ

m or less.

6. The display device according to claim 5,

wherein a width W of the sub-pixel area and a thickness T of the liquid crystal layer have such a relation that a ratio W/T is 3.5 or more.

7. The display device according to claim 4,

wherein the opening is overlapped on the image lines or scanning lines.

8. The display device according to claim 1,

wherein the image lines extend in a first direction, and the first electrode extends in a direction slanting to the first direction.

9. The display device according to claim 8,

wherein the first electrode has a bending portion.

10. The display device according to claim 1,

wherein the display device is used in a head mounted display.

11. The display device according to claim 2,

wherein the first electrode is a pixel electrode, and the second electrode is a common electrode formed over the plural sub-pixel areas.

12. The display device according to claim 2,

wherein the first and second electrodes in the light transmission area is not overlapped.

13. The display device according to claim 11,

wherein the first and second electrodes in the light transmission area is not overlapped.

14. The display device according to claim 2,

wherein the liquid crystal layer has a thickness of 2.8 μ

m or less.

15. The display device according to claim 3,

wherein the liquid crystal layer has a thickness of 2.8 μ

m or less.

16. The display device according to claim 4,

wherein the liquid crystal layer has a thickness of 2.8 μ

m or less.

17. The display device according to claim 11,

wherein the liquid crystal layer has a width of 2.8 μ

m or less.

18. The display device according to claim 12,

wherein a width W of the sub-pixel area and a thickness T of the liquid crystal layer have such a relation that a ratio W/T is 3.5 or more.

19. The display device according to claim 15,

wherein a width W of the sub-pixel area and a thickness T of the liquid crystal layer have such a relation that a ratio W/T is 3.5 or more.

20. The display device according to claim 16,

wherein a width W of the sub-pixel area and a thickness T of the liquid crystal layer have such a relation that a ratio W/T is 3.5 or more.