Display device and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-10073313-B2
Application number	US-201715420357-A
Country	US
Kind code	B2
Filing date	Jan 31, 2017
Priority date	Jul 2, 2014
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

A provided is a liquid crystal display device with a high definition screen and less color mixture. On an array substrate, a pixel is formed between the adjacent video signal lines, a color filter is formed within the pixel, a flattening film is formed on the color filter, a lower layer is formed on the flattening film, and an upper layer having a slit is formed on the lower layer with an interlayer insulating film interposed therebetween; and on the array substrate, an opposite substrate is arranged with a liquid crystal layer interposed therebetween. When a distance from the top of the video signal line working as a light shielding film to the bottom of the liquid crystal layer is defined as d and a space between the centers of the video signal lines separating the pixel is defined as w, a relation of d≤0.3w is satisfied.

First claim

What is claimed is:

1. A liquid crystal display device comprising:
an array substrate on which first signal lines are respectively extended in a first direction and aligned in a second direction, second signal lines are respectively extended in the second direction and aligned in the first direction, and pixels are respectively formed in areas surrounded by the first signal lines and the second signal lines, and
an opposite substrate arranged in a way of facing the array substrate through a liquid crystal layer,
wherein a color filter is formed on at least one pixel of the pixels of the array substrate, an overcoat film is formed on the color filter, a first transparent electrode is formed on the overcoat film, an interlayer insulating film is formed to cover the first transparent electrode, and a second transparent electrode with a slit is formed on the interlayer insulating film,
the second signal line is a light shielding film, and
when a distance between centers of the adjacent second signal lines separating at least one pixel of the pixels in the first direction is defined as w, and
a distance from the top of the second signal line to the bottom of the liquid crystal layer is defined as d,
an expression of d≤0.3w is satisfied.

2. The device according to claim 1 , wherein a relation between the w and the d satisfies an expression of d≤0.15w.

3. The device according to claim 1 , wherein resolution of a display screen is 500 ppi and more.

4. The device according to claim 1 , wherein the overcoat film is formed of resin with thickness in a range of 50% to 150% inclusive of thickness of the color filter.

5. The device according to claim 1 , wherein the color filter and the second signal line working as the light shielding film are in contact with each other.

6. The device according to claim 1 , wherein the overcoat film is an inorganic film.

7. The device according to claim 6 , wherein the overcoat film is formed of SiN or SiO2.

8. The device according to claim 1 , wherein the color filter is formed on at least one pixel of the pixels in an island shape.

9. The device according to claim 8 ,
a through hole connecting a TFT and either one of the first transparent electrode or the second transparent electrode,
wherein the color filter doesn't cover the through hole.

10. The device according to claim 9 , wherein the first transparent electrode is a pixel electrode.

11. The device according to claim 8 ,
a first through hole connecting the second signal line and a semiconductor of a TFT, a second through hole connecting the semiconductor of the TFT and a contact electrode, a third through hole connecting the contact electrode and either one of the first transparent electrode or the second transparent electrode,
wherein the color filter doesn't cover the third through hole.

12. The device according to claim 11 , wherein the first transparent electrode is a pixel electrode.

13. The device according to claim 1 ,
a through hole connecting a TFT and either one of the first transparent electrode or the second transparent electrode,
wherein the color filter doesn't cover the through hole.

14. The device according to claim 13 , wherein the first transparent electrode is a pixel electrode.

15. The device according to claim 1 ,
a first through hole connecting the second signal line and a semiconductor of a TFT, a second through hole connecting the semiconductor of the TFT and a contact electrode, a third through hole connecting the contact electrode and either one of the first transparent electrode or the second transparent electrode,
wherein the color filter doesn't cover the third through hole.

16. The device according to claim 15 , wherein the first transparent electrode is a pixel electrode.

17. A liquid crystal display device comprising:
an array substrate on which first signal lines are respectively extended in a first direction and aligned in a second direction, second signal lines are respectively extended in the second direction and aligned in the first direction, and pixels are respectively formed in areas surrounded by the first signal lines and the second signal lines, and an opposite substrate arranged in a way of facing the array substrate through a liquid crystal layer,
wherein a color filter is formed on at least one pixel of the pixels of the array substrate, a first transparent electrode is formed on the color filter, an interlayer insulating film is formed to cover the first transparent electrode, and a second transparent electrode with a slit is formed on the interlayer insulating film,
the second signal line is a light shielding film, and
when a distance between centers of the adjacent second signal lines separating at least one pixel of the pixels in the first direction is defined as w, and
a distance from an upper boundary of the second signal line to a lower boundary of the liquid crystal layer is defined as d,
an expression of d≤0.3w is satisfied.

18. The device according to claim 17 , wherein a relation between the w and the d satisfies an expression of d≤0.15w.

19. The device according to claim 17 ,
a through hole connecting a TFT and either one of the first transparent electrode or the second transparent electrode,
wherein the color filter doesn't cover the through hole.

20. The device according to claim 19 , wherein the first transparent electrode is a pixel electrode.

Assignees

• Japan Display Inc

Inventors

• Nakao Kenji
• Itou Osamu
• Ishigaki Toshimasa
• Sonoda Daisuke
• Hiratsuka Takato

Classifications

• G02F2201/123

  pixel · CPC title

• G02F2201/121

  common or background · CPC title

• G02F1/1368

  in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} · CPC title

• G02F1/136286 Primary

  Wiring, e.g. gate line, drain line · CPC title

• G02F1/136209

  Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element · CPC title