Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-2017192324-A1
Application number	US-201715467442-A
Country	US
Kind code	A1
Filing date	Mar 23, 2017
Priority date	Nov 6, 2013
Publication date	Jul 6, 2017
Grant date	—

Abstract

To provide a liquid crystal display device capable of controlling deterioration of contrast even in the case where an opening is formed in an organic flattened film and the film has unevenness. In the liquid crystal display device that includes a TFT substrate, a CF substrate, and liquid crystal sandwiched between the TFT substrate and the CF substrate and that drives the liquid crystal with a lateral electric field, the TFT substrate has the organic flattened film in which a through hole for contacting a source electrode of the TFT and a pixel electrode and a sectional shape of the through hole is asymmetrical between a side on which the pixel electrode extends and the other side.

First claim

What is claimed is:

1 . A liquid crystal display device comprising:
a first substrate having a plurality of drain lines, a plurality of gate lines, a plurality of TFT and a plurality of pixel electrodes; a second substrate having a plurality of spacers; liquid crystal sandwiched between the first substrate and the second substrate, the first substrate has an organic film between the TFT and the pixel electrode, the organic film has a through hole for contacting a source electrode of the TFT and the pixel electrode, and wherein a sidewall shape in the cross section of the through hole is formed asymmetrically in the direction along the drain line and formed symmetrically in the direction along the gate line.

2 . The liquid crystal display device according to claim 1 , wherein a common electrode is formed between the organic film and the pixel electrode, and
the common electrode is not formed in the asymmetric region of the through hole.

3 . The liquid crystal display device according to claim 1 , wherein the spacers are arranged on the drain line through the organic film.

4 . The liquid crystal display device according to claim 1 , wherein an alignment film is formed between the liquid crystal and the pixel electrode, the alignment film subjected to an alignment treatment by rubbing.

5 . The liquid crystal display device according to claim 1 , wherein the organic film is formed of a photoresist film, and
the through hole is formed by exposing the photoresist film using a half-tone mask.

6 . The liquid crystal display device according to claim 1 , wherein the through hole contacts a source electrode of the TFT and the pixel electrode for forming the lateral electric field.

Assignees

• Japan Display Inc

Inventors

• Komatsu Hiroaki
• Nakayama Takanori
• Sugiyama Saori

Classifications

• G02F1/133784

  by rubbing · CPC title

• G02F2001/136236

  Physics · mapped topic

• G02F1/136227 Primary

  Through-hole connection of the pixel electrode to the active element through an insulation layer · CPC title

• G02F1/1368

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

• G02F2201/14

  asymmetric · CPC title