Liquid crystal display panel and liquid crystal display device including same

Patent metadata

Field	Value
Publication number	US-9513522-B2
Application number	US-201214009602-A
Country	US
Kind code	B2
Filing date	Apr 2, 2012
Priority date	Apr 7, 2011
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

There is provided a liquid crystal display panel that improves the reliability of thin film transistors while suppressing a degradation in display quality. A G TFT ( 120 g ) connected at its drain electrode ( 125 d ) to a G pixel electrode ( 130 g ) is disposed on the opposite side of the G pixel electrode ( 130 g ) from a B pixel electrode ( 130 b ). The distance between a B TFT ( 120 b ) connected at its drain electrode ( 125 d ) to the B pixel electrode ( 130 b ) and the B pixel electrode ( 130 b ) is greater than the distance between the G TFT ( 120 g ) connected at its drain electrode ( 125 d ) to the G pixel electrode ( 130 g ) and the G pixel electrode ( 130 g ). The distance between an R TFT ( 120 r ) connected at its drain electrode ( 125 d ) to an R pixel electrode ( 130 r ) and the B pixel electrode ( 130 b ) is greater than the distance between the B TFT ( 120 b ) connected to the B pixel electrode ( 130 b ) and the B pixel electrode ( 130 b ).

First claim

The invention claimed is:

1. A liquid crystal display panel for displaying a color image based on a predetermined number of primary colors, the liquid crystal display panel comprising:
a first substrate and a second substrate facing each other;
a liquid crystal layer sandwiched between the first substrate and the second substrate;
a plurality of video signal lines and a plurality of scanning signal lines disposed to intersect each other on the first substrate;
a plurality of pixels disposed in a matrix form along the plurality of video signal lines and the plurality of scanning signal lines; and
coloring layers of the predetermined number of primary colors, wherein
each of the pixels includes a plurality of subpixels associated with the predetermined number of primary colors, respectively,
each of the subpixels includes:
a thin film transistor including a source electrode electrically connected to a corresponding one of the plurality of video signal lines disposed along the subpixel, a gate electrode electrically connected to a corresponding one of the plurality of scanning signal lines disposed along the subpixel, a gate insulating film provided on the gate electrode, and a channel layer made of an oxide semiconductor and provided on the gate insulating film; and
a pixel electrode connected to the thin film transistor and facing a corresponding coloring layer of a primary color associated with the subpixel,

in each of the pixels, the pixel electrodes of the plurality of subpixels are arranged in a predetermined direction,
the channel layer includes a channel region corresponding to a region where the channel layer is overlapped with the gate electrode,
one of the thin film transistors connected to one of pixel electrodes adjacent in the predetermined direction to a pixel electrode facing a coloring layer of a primary color with a shortest wavelength among the predetermined number of primary colors is disposed on an opposite side of the one of the pixel electrodes from the pixel electrode facing the coloring layer of the primary color with the shortest wavelength,
a shortest distance between the channel region of the thin film transistor that is connected to the pixel electrode facing the coloring layer of the primary color with the shortest wavelength and the pixel electrode facing the coloring layer of the primary color with the shortest wavelength is greater than a shortest distance between the channel region of the thin film transistor that is connected to the one of the pixel electrodes and the one of the pixel electrodes, and
a shortest distance between the channel region of the thin film transistor that is connected to another one of the pixel electrodes adjacent in the predetermined direction to the pixel electrode facing the coloring layer of the primary color with the shortest wavelength and the pixel electrode facing the coloring layer of the primary color with the shortest wavelength is greater than or equal to a shortest distance between the channel region of the thin film transistor that is connected to the pixel electrode facing the coloring layer of the primary color with the shortest wavelength and the pixel electrode facing the coloring layer of the primary color with the shortest wavelength.

2. The liquid crystal display panel according to claim 1 , wherein
the predetermined direction is an extension direction of the plurality of scanning signal lines, and
a shortest distance between the channel region of the thin film transistor that is connected to another one of pixel electrodes adjacent in the extension direction of the plurality of scanning signal lines to the pixel electrode facing the coloring layer of the primary color with the shortest wavelength and the pixel electrode facing the coloring layer of the primary color with the shortest wavelength is greater than a shortest distance between the channel region of the thin film transistor that is connected to the pixel electrode facing the coloring layer of the primary color with the shortest wavelength and the pixel electrode facing the coloring layer of the primary color with the shortest wavelength.

3. The liquid crystal display panel according to claim 2 , wherein the thin film transistor connected to the pixel electrode facing the coloring layer of the primary color with the shortest wavelength and the thin film transistor connected to the other one of the pixel electrodes are disposed in positions facing each other with corresponding video signal lines sandwiched therebetween, the corresponding video signal lines being connected to the thin film transistors, respectively.

4. The liquid crystal display panel according to claim 1 , wherein
the predetermined direction is an extension direction of the plurality of video signal lines, and
a shortest distance between the channel region of the thin film transistor that is connected to another one of pixel electrodes adjacent in the extension direction of the plurality of video signal lines to the pixel electrode facing the coloring layer of the primary color with the shortest wavelength and the pixel electrode facing the coloring layer of the primary color with the shortest wavelength is equal to a shortest distance between the channel region of the thin film transistor that is connected to the pixel electrode facing the coloring layer of the primary color with the shortest wavelength and the pixel electrode facing the coloring layer of the primary color with the shortest wavelength.

5. The liquid crystal display panel according to claim 1 , wherein a light-shielding layer is disposed in a position facing each thin film transistor.

6. The liquid crystal display panel according to claim 1 , wherein the coloring layers are disposed on the second substrate.

7. The liquid crystal display panel according to claim 1 , wherein each coloring layer is disposed on a pixel electrode facing the coloring layer.

8. The liquid crystal display panel according to claim 1 , wherein the primary color with the shortest wavelength is blue.

9. The liquid crystal display panel according to claim 8 , wherein the color image is displayed based on red, green, and blue.

10. The liquid crystal display panel according to claim 8 , wherein the color image is displayed based on red, green, blue, and yellow.

11. A liquid crystal display device comprising a liquid crystal display panel according to claim 1 .

12. The liquid crystal display panel according to claim 1 , wherein the oxide semiconductor includes indium, gallium, zinc, and oxygen.

13. A liquid crystal display panel for displaying a color image based on a predetermined number of primary colors, the liquid crystal display panel comprising:
a first substrate and a second substrate facing each other;
a liquid crystal layer sandwiched between the first substrate and the second substrate;
a plurality of video signal lines and a plurality of scanning signal lines disposed to intersect each other on the first substrate;
a plurality of pixels disposed in a matrix form along the plurality of video signal lines and the plurality of scanning signal lines; and
coloring layers of the predetermined number of primary colors, wherein
each of the pixels includes a plurality of subpixels associated with the predetermined number of primary colors, respectively,
each of the subpixels includes:
a thin film transistor including a source electrode electrically connected to a corresponding one of the plurality of video signal lines disposed along the subpixel, a gate electrode electrically connected to a corresponding one of the plurality of scanning signal lines disposed along the subpixel, a gate insulating

Assignees

• Matsukizono Hiroshi
• Sharp Kk

Inventors

• Matsukizono Hiroshi

Classifications

• G02F1/1368

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

• G02F2201/52

  RGB geometrical arrangements · CPC title

• G02F1/136286 Primary

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

• G02F1/1335 Primary

  Structural association of cells with optical devices, e.g. polarisers or reflectors · CPC title