Liquid crystal display device and manufacturing method for same

Patent metadata

Field	Value
Publication number	US-9274367-B2
Application number	US-201414575581-A
Country	US
Kind code	B2
Filing date	Dec 18, 2014
Priority date	Jun 18, 2009
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

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.

First claim

What is claimed is:

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 μm or more and 4 μm 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 μm or more and 4 μm or less.

4. The display device according to claim 1 , wherein a film thickness of the color filter is 1 μm or more and 4 μm 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 μm 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 μm or more and 7 μm 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 μm or more and 7 μm or less.

16. The display device according to claim 10 , wherein a width of the signal line is 1 μm or more and 4 μm or less.

17. The display device according to claim 10 , wherein a film thickness of the color filters is 1 μm or more and 4 μm or less.

Assignees

• Japan Display Inc
• Panasonic Liquid Crystal Displ
• Panasonic Liquid Crystal Displ

Inventors

• Mizuno Yasuhiro
• Tanno Junji
• Hayahara Shinsuke
• Sakurai Masato
• Kimura Yasukazu
• Fujiyoshi Jun

Classifications

• H10D86/441

  Interconnections, e.g. scanning lines · CPC title

• H10D86/421

  having a particular composition, shape or crystalline structure of the active layer · CPC title

• H10D86/60

  wherein the TFTs are in active matrices · CPC title

• H10D86/40

  characterised by multiple TFTs · CPC title

• H10D30/6745

  Polycrystalline or microcrystalline silicon · CPC title