Liquid crystal display device and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-9910313-B2
Application number	US-201715448608-A
Country	US
Kind code	B2
Filing date	Mar 3, 2017
Priority date	Mar 4, 2016
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A liquid crystal display device includes a first substrate and a second substrate disposed in opposition. The first substrate includes gate lines, data lines, pixel electrodes, and an insulating film being superimposed, in plan view, over the gate lines, the data lines, and the pixel electrodes. The second substrate includes a first colored portion transmitting light of a first color, a second colored portion transmitting light of a second color, and a light-shielding portion disposed in a boundary area between the first colored portion and the second colored portion, for blocking transmittance of light of the first color and light of the second color. The insulating film includes a first portion overlapping, in plan view, the first colored portion or the second colored portion, and a second portion overlapping, in plan view, the light-shielding portion and being of thicker film thickness than the first portion.

First claim

What is claimed is:

1. A liquid crystal display device comprising:
a first substrate and a second substrate disposed in opposition; wherein
the first substrate includes
a plurality of gate lines, a plurality of data lines, a plurality of pixel electrodes, and an insulating film being superimposed, in plan view, over the plurality of gate lines, the plurality of data lines, and the plurality of pixel electrodes;

the second substrate includes
a first colored portion transmitting light of a first color, a second colored portion transmitting light of a second color, and a light-shielding portion disposed in a boundary area between the first colored portion and the second colored portion, for blocking transmittance of light of the first color and light of the second color; and
the insulating film includes
a first portion overlapping, in plan view, the first colored portion or the second colored portion, and
a second portion overlapping, in plan view, the light-shielding portion and being of thicker film thickness than the first portion.

2. The liquid crystal display device of claim 1 , wherein the insulating film is an organic insulating film.

3. The liquid crystal display device of claim 1 , wherein:
the first substrate further includes a common electrode; and
the insulating film is disposed between the common electrode and the plurality of pixel electrodes.

4. A method of manufacturing a liquid crystal display device including a first substrate including a plurality of gate lines, a plurality of data lines, a plurality of pixel electrodes, and an organic insulating film, made of an organic material, being superimposed, in plan view, over the plurality of gate lines, the plurality of data lines, and the plurality of pixel electrodes, and a second substrate including a first colored portion transmitting light of a first color, a second colored portion transmitting light of a second color, and a light-shielding portion disposed in a boundary area between the first colored portion and the second colored portion, for blocking transmittance of light of the first color and light of the second color, the liquid-crystal display device manufacturing method comprising:
a process of forming the organic insulating film, including
a step of forming an organic layer by coating an organic photosensitive material onto the first substrate, and
a step of irradiating the organic layer with light beams of differing amount of light onto a first portion of the organic layer overlapping, in plan view, the first colored portion or the second colored portion, and onto a second portion of the organic layer overlapping, in plan view, the light-shielding portion; wherein
in the step of forming the organic insulating film, the second portion is formed to be of thicker layer thickness than the first portion.

5. The liquid-crystal display device manufacturing method of claim 4 , wherein:
the liquid crystal display device further comprises a thin film transistor; and
in the step of irradiating the organic layer with light beams, a third portion of the organic layer being superimposed, in plan view, over the thin film transistor is irradiated with a light beam of amount of light different from that of the first portion and the second portion, to remove the third portion of the organic layer.

6. The liquid-crystal display device manufacturing method of claim 4 , wherein:
the organic photosensitive material is a positive-type photosensitive synthetic resin; and
in the step of irradiating the organic film with light beams, the amount of light that the first portion is irradiated with is greater compared with the amount of light that the second portion is.

7. The liquid-crystal display device manufacturing method of claim 6 , wherein in the step of irradiating the organic film with light beams, the amount of light that the third portion of the organic film being superimposed, in plan view, over the thin film transistor is irradiated with is greater compared with the amount of light that the first portion is.

8. A method of manufacturing a liquid crystal display device including a first substrate including a plurality of gate lines, a plurality of data lines, a plurality of pixel electrodes, and an inorganic insulating film, made of an inorganic material, being superimposed, in plan view, over the plurality of gate lines, the plurality of data lines, and the plurality of pixel electrodes, and a second substrate including a first colored portion transmitting light of a first color, a second colored portion transmitting light of a second color, and a light-shielding portion disposed in a boundary area between the first colored portion and the second colored portion, for blocking transmittance of light of the first color and light of the second color, the liquid-crystal display device manufacturing method comprising:
a process of forming the inorganic insulating film, including
a step of forming an inorganic layer onto the first substrate,
a step of forming a resist layer by coating an organic photosensitive material onto the inorganic layer, a step of irradiating the inorganic layer with light beams of differing amount of light onto a first region of the resist layer overlapping, in plan view, the first colored portion or the second colored portion, and onto a second region of the resist overlapping, in plan view, the light-shielding portion;
a first resist removing step of removing the first region of the resist layer and leaving the second region of the resist layer;
a first etching step of etching portions of a first part of the inorganic layer overlapping the first region in plan view; and
a second resist removing step of removing the second region of the resist layer; wherein
in the step of forming the inorganic layer, a second part of the inorganic layer overlapping the second region in plan view is formed to be of thicker film thickness than the first part of the inorganic layer.

9. The liquid-crystal display device manufacturing method of claim 8 , wherein:
the first substrate further includes a thin film transistor;
in the step of irradiating the inorganic layer with light beams, a third region of the inorganic layer overlapping at least a part of the thin film transistor in plan view is irradiated with a light beam of amount of light different from that of the first region and the second region of the inorganic layer, to remove the resist layer; and
the manufacturing method further comprises a second etching step of removing, by etching, a third part of the inorganic layer overlapping the third region in plan view.

10. The liquid-crystal display device manufacturing method of claim 8 , wherein:
the organic photosensitive material is a positive-type photosensitive synthetic resin; and
in the step of irradiating the inorganic layer with light beams, the amount of light that the first region is irradiated with is greater compared with the amount of light that the second region is.

11. The liquid-crystal display device manufacturing method of claim 10 , wherein in the step of irradiating the inorganic film with light beams, the amount of light that the third region overlapping at least a part of the thin film transistor in plan view is irradiated with is greater compared with the amount of light that the first part is.

Assignees

• Panasonic Liquid Crystal Displ

Inventors

• Sakakibara Tatsuhito
• Kajita Daisuke
• Fuse Daisuke
• Oke Ryutaro

Classifications

• G02F1/133512 Primary

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title

• G02F2202/023

  curable · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G02F1/136286

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

• G02F2201/121

  common or background · CPC title