LIQUID CRYSTAL DISPLAY APPARATUS AND METHOD FOR MANUFACTURING LIQUID CRYSTAL DISPLAY APPARATUS

• US 20190310506A1
• Filed: 03/13/2019
• Published: 10/10/2019
• Est. Priority Date: 04/04/2018
• Status: Abandoned Application

• Current Assignee: Trivale Technologies, LLC (Vector Capital Corporation)
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: NOGUCHI, Hideki, IWASAKA, Toshihiko
• Application Number:
  US16/351,907
• Publication Number:
  US 20190310506A1
• Time in Patent Office: Days
• 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 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/136259 Repairing; Defects
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/136295 Materials; Compositions; Manufacture processes
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

In forming a counter electrode in an FFS type liquid crystal display apparatus, a slit is not provided in a first pixel in which it has been found, in advance, that a bright spot defect is to occur by a defect inspection apparatus or the like. In the pixel without the slit, since a fringe electric field that has possibly occurred near the slit does not occur, a black spot defect can be obtained even if a signal potential is inputted to a pixel electrode.

Claims

1. A liquid crystal display apparatus comprising:

a gate wiring and a source wiring that cross each other in a display area of an array substrate;

a pixel, in the display area, having at least one switching element connected to the gate wiring and the source wiring, and a pixel electrode; and

a counter electrode facing the pixel electrode via an insulating film, wherein

a slit is formed in at least one of the pixel electrode and the counter electrode,

the pixel includes a first pixel and a second pixel, and

an area of a slit of the first pixel is less than 10% of an area of a slit of the second pixel.

2. The liquid crystal display apparatus according to claim 1, wherein a slit is not formed in the first pixel.

3. The liquid crystal display apparatus according to claim 1, wherein

the switching element further includes a source electrode electrically connected to the source wiring, and a drain electrode electrically connected to the pixel electrode, and

in the first pixel, the source electrode or the source wiring is connected to the drain electrode or the pixel electrode via a conductive film.

4. The liquid crystal display apparatus according to claim 3, wherein the conductive film includes any of a semiconductor film added with an impurity, a metal film, a transparent conductive film, and an oxide semiconductor film.

5. The liquid crystal display apparatus according to claim 3, wherein the conductive film is a semiconductor film and is formed in a light transmitting part.

6. A method for manufacturing a liquid crystal display apparatus, the method comprising the steps of:

forming a gate wiring on a substrate;

forming a semiconductor film;

forming a source wiring to cross the gate wiring via a first insulating film;

forming a pixel electrode;

forming an interlayer insulating film; and

forming a counter electrode to face the pixel electrode via the interlayer insulating film, wherein

any one of the pixel electrode and the counter electrode has a slit,

a switching element in which a source electrode electrically connected to the source wiring and a drain electrode electrically connected to the pixel electrode are electrically connected to the semiconductor film, and

an area of a slit of a first pixel is less than 10% of an area of a slit of a second pixel.

7. The method for manufacturing the liquid crystal display apparatus according to claim 6, wherein a slit is not formed in the first pixel.

8. The method for manufacturing the liquid crystal display apparatus according to claim 6, further comprising the step of providing an etching inhibition layer in a region corresponding to the slit in the first pixel, in forming an electrode having the slit out of the pixel electrode or the counter electrode.

9. The method for manufacturing the liquid crystal display apparatus according to claim 8, wherein

an electrode having an upper slit out of the pixel electrode or the counter electrode is formed by formation of an amorphous transparent conductive film, and

the etching inhibition layer is a crystallized transparent conductive film.

10. The method for manufacturing the liquid crystal display apparatus according to claim 9, further comprising the step of forming the etching inhibition layer by irradiating the amorphous transparent conductive film with laser light.

11. The method for manufacturing the liquid crystal display apparatus according to claim 9, wherein in forming the electrode having the slit out of the pixel electrode or the counter electrode, etching is performed with an etching solution having a higher etching rate of an amorphous transparent conductive film than an etching rate of a crystallized transparent conductive film.

12. The method for manufacturing the liquid crystal display apparatus according to claim 8, wherein the etching inhibition layer is an insulating film.

13. The method for manufacturing the liquid crystal display apparatus according to claim 8, wherein the etching inhibition layer is a negative resist.

14. The method for manufacturing the liquid crystal display apparatus according to claim 13, wherein the etching inhibition layer is formed by additional exposure to the first pixel.

15. The method for manufacturing the liquid crystal display apparatus according to claim 6, wherein in the first pixel, the source electrode or the source wiring is connected to the drain electrode or the pixel electrode via a conductive film.

16. The method for manufacturing the liquid crystal display apparatus according to claim 15, wherein the conductive film includes any of a semiconductor film added with an impurity, a metal film, a transparent conductive film, and an oxide semiconductor film.

17. The method for manufacturing the liquid crystal display apparatus according to claim 15, wherein the conductive film is a semiconductor film and is formed in a light transmitting part.