Liquid crystal display apparatus

• US 10,274,791 B2
• Filed: 03/08/2016
• Issued: 04/30/2019
• Est. Priority Date: 03/09/2015
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Tae-Sang
• Primary Examiner(s): Caley, Michael H
• Assistant Examiner(s): Qureshi, Mariam
• Application Number:
  US15/064,065
• Publication Number:
  US 20160266450A1
• Time in Patent Office: 1,148 Days
• CPC Class Codes: G02F 1/133357 Planarisation layers
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• 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 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• 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 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/13606 having means for reducing parasitic capacitance
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/13629 Multilayer wirings

Abstract

Provided is a liquid crystal display apparatus. The liquid crystal display apparatus comprises a plurality of common electrode lines on a first substrate, a first planarization layer on the plurality of common electrode lines, a plurality of data lines on the first planarization layer, a second planarization layer on the plurality of data lines, and a plurality of divided common electrodes on the second planarization layer, wherein an opening portion is between the plurality of divided common electrodes, wherein the common electrode lines and the data lines overlap each other at the opening portion, and wherein a width of the common electrode lines is larger than a width of the data lines for reducing a degree of color wash-out phenomenon of neighboring sub-pixels adjacent to the opening portion.

Claims

1. A liquid crystal display apparatus having a plurality of sub-pixels to display an image, comprising:

a plurality of common electrode lines on a first substrate, the plurality of common electrode lines dividing the plurality of sub-pixels into a plurality of groups of sub-pixels;

a first planarization layer on the plurality of common electrode lines;

a plurality of data lines on the first planarization layer;

a second planarization layer on the plurality of data lines; and

a plurality of divided common electrodes on the second planarization layer, each divided common electrode overlapping one of the plurality of groups of sub-pixels, with an opening portion between the plurality of divided common electrodes,

wherein the plurality of common electrode lines and the plurality of data lines overlap each other at the opening portion,

wherein a width of each of the plurality of common electrode lines is larger than a width of each of the plurality of data lines for reducing a degree of color wash-out phenomenon of neighboring sub-pixels adjacent to the opening portion,

wherein the width of the plurality of common electrode lines is larger than the width of the opening portion,

wherein the plurality of common electrode lines include at least two stacked metallic layers,

wherein a reflectance of visible wavelengths of a bottommost metallic layer of the common electrode lines is higher than a reflectance of visible wavelengths of an uppermost metallic layer of the common electrode lines, and

wherein a thickness of the uppermost metallic layer of the common electrode lines is more than 250 Å

to increase the absorption efficiency of the visible wavelengths.

2. The liquid crystal display apparatus of claim 1, wherein a portion of the plurality of common electrode lines overlap a portion of each of the divided common electrodes adjacent to the opening portion.

3. The liquid crystal display apparatus of claim 1, further comprising a second substrate having a color filter and a black matrix,

wherein the black matrix overlaps the common electrode lines at the opening portion, and

wherein a width of the black matrix is larger than the width of the common electrode lines.

4. The liquid crystal display apparatus of claim 1, wherein the first planarization layer is made of an inorganic material and the second planarization layer is made of an organic material.

5. The liquid crystal display apparatus of claim 1, further comprising:

a passivation layer positioned on the plurality of divided common electrodes;

a pixel electrode and an auxiliary common electrode positioned on the passivation layer, and

wherein the auxiliary common electrode is positioned at the opening portion.

6. The liquid crystal display apparatus of claim 5, wherein the auxiliary common electrode is configured to be electrically connected to a neighboring divided common electrode among the plurality of the divided common electrodes.

7. The liquid crystal display apparatus of claim 6, wherein a width of the auxiliary common electrode is smaller than the width of the opening portion.

8. The liquid crystal display apparatus of claim 1, wherein the divided common electrode is configured for self-capacitance sensing.

9. The liquid crystal display apparatus of claim 8, wherein the plurality of common electrode lines are extended along with the plurality of the data lines.

10. The liquid crystal display apparatus of claim 1, wherein the uppermost metallic layer of the common electrode lines includes at least one element among carbon, nitrogen and oxygen, and

wherein the width of the bottommost metallic layer of the common electrode line is larger than the width of the uppermost metallic layer of the common electrode line.

11. A liquid crystal display apparatus having a plurality of sub-pixels to display an image, comprising:

a liquid crystal panel configured to include a color filter substrate, an array substrate

and a liquid crystal layer interposed between the color filter substrate and the array substrate;

a black matrix configured to separate the plurality of sub-pixels of the color filter substrate;

a plurality of divided common electrodes and a plurality of data lines on the array substrate, each divided common electrode overlapping two or more of the plurality of sub-pixels, with an opening portion therebetween; and

a color wash-out reducing layer on the array substrate and configured to reduce color wash-out phenomenon of the sub-pixels which are separated by the black matrix

wherein a width of the black matrix is larger than a width of the opening portion,

wherein a width of the opening portion is larger than a width of each of the plurality of data lines, and

wherein the color wash-out reducing layer is configured to be overlapped at the opening portion, with a width of the color wash-out reducing layer being larger than the width of the opening portion,

wherein a reflectance of visible wavelengths of a bottommost metallic layer of the color wash-out reducing layer is higher than a reflectance of visible wavelengths of an uppermost metallic layer of the color wash-out reducing layer, and

wherein a thickness of the uppermost metallic layer of the color wash-out reducing layer is more than 250 Å

to increase the absorption efficiency of the visible wavelengths.

12. The liquid crystal display apparatus of claim 11, wherein the color wash-out reducing layer is configured to control the plurality of divided common electrodes.

13. The liquid crystal display apparatus of claim 12, wherein the color wash-out reducing layer and the divided common electrodes are separated by an inorganic planarization layer having a thickness of at least 0.8 μ

m resulting in reduced parasitic capacitance when compared to a conventional liquid crystal display apparatus with said color wash-out reducing layer.

14. A liquid crystal display apparatus having a plurality of sub-pixels to display an image, comprising:

a plurality of common electrode lines, a plurality of data lines, a plurality of divided common electrodes and a data driver on a first substrate, the plurality of common electrode lines dividing the plurality of sub-pixels into a plurality of groups of sub-pixels, each divided common electrode overlapping one of the plurality of groups of sub-pixels;

wherein the divided common electrodes are spaced apart from each other, thereby forming an opening portion therebetween,

wherein the plurality of data lines are disposed on the plurality of common electrode lines and the plurality of divided common electrodes are disposed on the plurality of data lines,

wherein the common electrode line and the data line are in the opening portion and are overlapped with each other,

wherein the width of the plurality of common electrode lines is larger than the width of the opening portion, and

wherein a width of the common electrode line is larger than a width of the data line,

wherein a reflectance of visible wavelengths of a bottommost metallic layer of the common electrode lines is higher than a reflectance of visible wavelengths of an uppermost metallic layer of the common electrode lines, and

wherein a thickness of the uppermost metallic layer of the common electrode lines is more than 250 Å

to increase the absorption efficiency of the visible wavelengths.

15. The liquid crystal display apparatus of claim 14, wherein an arrangement of the plurality of the common electrode lines, the plurality of divided common electrodes and

the data driver is configured to provide at least one among self-capacitance sensing function, power saving function, and over driving function.