Liquid crystal display device and manufacturing method for same

• US 9,274,367 B2
• Filed: 12/18/2014
• Issued: 03/01/2016
• Est. Priority Date: 06/18/2009
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Japan Display Incorporated, Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Mizuno, Yasuhiro, Tanno, Junji, Hayahara, Shinsuke, Sakurai, Masato, Kimura, Yasukazu, Fujiyoshi, Jun
• Primary Examiner(s): CHANG, CHARLES S
• Application Number:
  US14/575,581
• Publication Number:
  US 20150102356A1
• Time in Patent Office: 439 Days
• Field of Search: 349106-109
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
• CPC Class Codes: G02F 1/136222 Colour filters incorporated in the active matrix substrate
• 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 1/136236 using a grey or half tone lithographic process
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: H01L 27/1214 comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
• CPC Class Codes: H01L 27/1222 with a particular composition, shape or crystalline structure of the active layer
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 29/78675 with normal-type structure, e.g. with top gate

Abstract

Display device, including: substrates, color filters having first and second color filters, drain and gate signal lines (of light blocking material), wherein, an overlapping portion adjacent the first and second color filter overlap, is formed on a region with one of the drain or gate signal lines, a first color filter edge is a first taper and a second color filter edge is a second taper, in the overlapping portion, the first taper is closer to the drain or gate signal line than the second taper in the overlapping portion, the first taper angle is 45° or more and 90° or less corresponding to a surface of the drain or gate signal line, the second taper angle is 45° or more and 90° or less corresponding to a surface of the first taper and, the first taper angle is larger than the second taper angle.

Claims

1. A display device, comprising:

a pair of substrates,

color filters having a first color filter and a second color filter, drain signal lines, gate signal lines, and a pixel region disposed between the pair of substrates, wherein,

the gate signal lines is made of a light blocking material, and the drain signal line is made of a light blocking material, and

an overlapping portion at which the first color filter and the second color filter overlap each other, is formed on a region in plain view, the region is formed with one of the drain signal lines or one of the gate signal lines,

an edge portion of the first color filter is a first taper in the overlapping portion, and an edge portion of the second color filter is a second taper in the overlapping portion,

the first taper is closer to the drain signal line or the gate signal line than the second taper in the overlapping portion,

an angle of the first taper is 45°

or more and 90°

or less corresponding to a surface of the drain signal line or the gate signal line, an angle of the second taper is 45°

or more and 90°

or less corresponding to a surface of the first taper and,

the angle of the first taper is smaller than the angle of the second taper.

2. The display device according to claim 1, wherein a width of the signal line is 1 μ

m or more and 4 μ

m or less.

3. The display device according to claim 1, wherein a film thickness of the first color filter and a film thickness of the second color filter are 1 μ

m or more and 4 μ

m or less.

4. The display device according to claim 1, wherein a film thickness of the color filter is 1 μ

m or more and 4 μ

m or less, and

a step which a prominent height of the second color filter corresponding to the surface of the first color filter in the region, is 1 μ

m or less.

5. The display device according to claim 1, wherein the angle of the first taper is 45°

or more and 70°

or less corresponding to the surface of the drain signal line or one of the gate signal line, the angle of the second taper is 45°

or more and 70°

or less corresponding to the surface of the first taper.

6. The display device according to claim 1, wherein

the first color filter and the second color filter have pigments, and

a density of the pigments in the first color filter is 10% or more and 60% or less, a density of the pigments in the second color filter is 10% or more and 60% or less.

7. The display device according to claim 1, wherein the density of the pigments in the second color filter is lower than the density of the pigments in said first color filter.

8. The display device according to claim 1, wherein a relative dielectric constant of the first color filter is 3.0 or more and 7.0 or less, and a relative dielectric constant of the second color filter is 3.0 or more and 7.0 or less.

9. The display device according to claim 1, wherein a width of the overlapping portion is 1 μ

m or more and 7 μ

m or less.

10. A display device, comprising:

a first substrate and a second substrate facing the first substrate,

color filters having a first color filter and a second color filter, and signal lines disposed between the first substrate and the second substrate, and

a thin film transistor having a source electrode and connecting to one of the signal lines, wherein,

a pixel electrode electrically connects with the transistor,

the pixel electrode, the color filter, and the second color filter are formed on the first substrate,

the first color filter and the second color filter are disposed between the first substrate and the pixel electrode,

the color filters have an overlapping portion in which the first color filter and the second color filter overlap each other,

a contact hole for electrically connecting between the pixel electrode and the source electrode of the transistor,

an edge of the first color filter and an edge of the second color filter have a taper in the overlapping portion,

the color filters have a non-overlapping portion where the first color filter and the second color filter don'"'"'t overlap, and

an angle of the taper in the overlapping portion is smaller than an angle of the contact hole corresponding to a surface of the source electrode.

11. The display device according to claim 10, wherein

a width of the overlapping portion is narrower than a width of the non-overlapping portion.

12. The display device according to claim 10, wherein the angle of the taper in the overlapping portion is 30°

or more and 75°

or less.

13. The display device according to claim 10, wherein the angle of the taper in the contact hole in the first color filter is 45°

or more and 90°

or less.

14. The display device according to claim 10, wherein the first color filter and the second color filter have pigments, and the density of the pigments is 10% or more and 60% or less in the color filters.

15. The display device according to claim 10, wherein a width of the overlapping portion is 1 μ

m or more and 7 μ

m or less.

16. The display device according to claim 10, wherein a width of the signal line is 1 μ

m or more and 4 μ

m or less.

17. The display device according to claim 10, wherein a film thickness of the color filters is 1 μ

m or more and 4 μ

m or less.