LIQUID CRYSTAL DISPLAY DEVICE

• US 20180164648A1
• Filed: 02/08/2018
• Published: 06/14/2018
• Est. Priority Date: 10/31/2013
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Tomioka, Yasushi, Hyodo, Yosuke, Sonoda, Hidehiro, Kunimatsu, Noboru
• Granted Patent: US 10,031,383 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133788 by light irradiation, e.g. linearly polarised light photo-polymerisation
• 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 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2202/02 organic material
• CPC Class Codes: H01L 27/1218 with a particular composition or structure of the substrate

Abstract

In a liquid crystal display device, a common electrode is formed on an organic passivation film, an interlayer insulating film is formed on the common electrode, a pixel electrode with a slit is formed on the interlayer insulating film, and a through hole is formed in the organic passivation film and the interlayer insulating film, so that the pixel electrode is connected to a source electrode of a TFT through the through hole. Further, the taper angle around the upper base of the through hole is smaller than the taper angle around the lower base. Thus, the alignment material can flow into the through hole when the diameter of the through hole is reduced to connect the pixel and source electrodes, preventing display defects such as uneven brightness due to the absence of the alignment film or due to the alignment film irregularity around the through hole.

Claims

1. A display device comprising:

a first substrate including a source electrode of a switching element, an organic film formed on the source electrode, and a first electrode formed on the organic film,

wherein the organic film has a hole which exposes the source electrode,

the source electrode is connected to the first electrode through the hole, and

the first electrode has a slit which extends toward the hole.

2. The display device according to claim 1,

wherein a video signal is supplied to the first electrode through the source electrode.

3. The display device according to claim 1,

wherein the organic film has a main surface which substantially parallel to the first substrate, a hole which expose the source electrode, and a side surface which extends, tapering to the first substrate, from the main surface to the hole,

wherein the slit is formed on the main surface of the organic film and the side surface of the organic film.

4. The display device according to claim 3, further comprising a second electrode formed between the organic film and the first electrode,

wherein the second electrode is not connected to the source electrode.

5. The display device according to claim 4,

wherein the second electrode extends to the side surface from the main surface of the organic film, and has an edge which is located between the hole and the main surface.

6. A display device comprising:

a first substrate including a source electrode of a switching element, a first electrode connected to the source electrode, an organic film formed between the source electrode and the first electrode, and a second electrode formed between the first electrode and the organic film,

wherein the organic film has a main surface, which is substantially parallel to the first substrate, and a hole, which exposes the source electrode, and has a side surface which extends, tapering to the first substrate, from the main surface to the hole,

the source electrode is connected to the first electrode through the hole, and

the second electrode extends to the side surface from the main surface of the organic film, and has an edge which is located between the hole and the main surface.

7. The display device according to claim 6,

wherein the second electrode is not connected to the source electrode.

8. The display device according to claim 6,

wherein the first electrode has a slit, and

wherein the slit is formed on the main surface and the side surface.

9. The display device according to claim 6,

wherein the slit on the side surface does not overlap with the source electrode, in a plan view.

10. The display device according to claim 6,

wherein a diameter of the hole is smaller than a width of the source electrode in a plan view, and

wherein an edge of the source electrode is covered by the organic film.

11. The display device according to claim 6, further comprising a second substrate opposed to the first substrate,

wherein the second substrate has a light shield film which overlaps with the source electrode, in a plan view.

12. The display device according to claim 11,

wherein a part of the side surface does not overlap with the source electrode and the light shield film, in a plan view.

13. The display device according to claim 6, further comprising an alignment film that covers the first substrate,

wherein the alignment film is a photo alignment film, and

wherein the alignment film is formed in the hole.

14. The display device according to claim 6,

wherein a video signal is supplied to the first electrode through the source electrode.