LIQUID CRYSTAL DISPLAY DEVICE

• US 20150138476A1
• Filed: 11/17/2014
• Published: 05/21/2015
• Est. Priority Date: 11/18/2013
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: HYODO, Yosuke, TOMIOKA, Yasushi, KUNIMATSU, Noboru, SONODA, Hidehiro, IMANISHI, Yasuo, HIROTA, Takenori
• Granted Patent: US 9,523,897 B2
• Time in Patent Office: Days
• US Class Current: 349/43
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/1337 Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer

Abstract

To take measures against the phenomenon of difficulty for the orientation film material to flow into the through-hole when the diameter of through-holes which connects the pixel electrode and the source electrode becomes small.

An interlayer insulating film 109 made of SiN is formed on a counter electrode, and a pixel electrode 110 having a slit 1101 is formed on the interlayer insulating film 109. A through-hole 111 which connects the pixel electrode 110 and the source electrode of a TFT has a large opening on the upper side, a small opening on the lower side, and an inner wall extending between the large opening and the small opening. The pixel electrode 110 covers the through-hole 111 on an inner side of the pixel of the through-hole 111 but does not cover a periphery of the large opening of the through-hole on an outer side of the through-hole 111. Consequently, an orientation film material can easily flow from a starting point given by an end portion of the pixel electrode into the inside of the through-hole.

Claims

1. A liquid crystal display device, comprising:

a thin film transistor substrate including

an organic passivation film,

a common electrode formed on the organic passivation film,

an interlayer insulating film formed on the common electrode,

a pixel electrode formed on the interlayer insulating film and having therein a slit closed at an end portion thereof, and

a pixel configured such that a source electrode of the thin film transistor and the pixel electrode are electrically connected to each other through a through-hole formed in the organic passivation film and the interlayer insulating film;

a counter substrate; and

liquid crystal sandwiched between the thin film transistor substrate and the counter substrate;

wherein the through-hole has

a large opening on the liquid crystal side,

a small opening on the thin film transistor substrate side, and

an inner wall extending between the large opening and the small opening; and

wherein the pixel electrode covers the through-hole on an inner side of the pixel of the through-hole but does not cover a periphery of the large opening of the through-hole on an outer side of the pixel.

2. A liquid crystal display device according to claim 1, comprising:

a shape in plan of the large opening has a major axis and a minor axis; and

wherein the pixel has a rectangular shape and the major axis of the large opening of the through-hole extends in a direction same as a direction of the major axis of the pixel, and the slit extends also to the inner wall of the through-hole.

3. A liquid crystal display device according to claim 1, comprising:

a shape in plan of the large opening has a major axis and a minor axis;

wherein the pixel electrode includes

a main pixel electrode having the slit and

a sub pixel electrode disposed so as to have a gap from the main pixel electrode;

wherein the pixel has a rectangular shape and the major axis of the large opening of the through-hole extends in a direction same as a direction of the minor axis of the pixel; and

wherein, in a region of the gap, a periphery of the large opening of the through-hole is not covered with the pixel electrode.

4. A liquid crystal display device, comprising:

a thin film transistor substrate including

an organic passivation film,

a common electrode formed on the organic passivation film,

an interlayer insulating film formed on and covering the common electrode,

a pixel electrode formed on the interlayer insulating film and having therein a slit closed at an end portion thereof, and

a pixel configured such that a source electrode of the thin film transistor and the pixel electrode are electrically connected to each other through a through-hole formed in the organic passivation film and the interlayer insulating film;

a counter substrate; and

liquid crystal sandwiched between the thin film transistor substrate and the counter substrate;

wherein the through-hole has

a large opening on the liquid crystal side,

a small opening on the thin film transistor substrate side, and

an inner wall extending between the large opening and the small opening; and

wherein the small opening of the through-hole is eccentric with respect to the large opening.

5. The liquid crystal display device according to claim 4, wherein the small opening of the through-hole is eccentric toward the center of the pixel with respect to the large opening.

6. The liquid crystal display device according to claim 4, wherein the pixel has a rectangular shape, the large opening of the through-hole has a major axis and a minor axis and the major axis of the large opening extends in a direction same as a direction of the major axis of the pixel, and the small opening of the through-hole is eccentric toward the center of the pixel with respect to the large opening.

7. A liquid crystal display device, comprising:

a thin film transistor substrate including

an organic passivation film,

a common electrode formed on the organic passivation film,

an interlayer insulating film formed on and covering the common electrode,

a pixel electrode formed on the interlayer insulating film and having therein a slit closed at an end portion thereof, and

a pixel configured such that a source electrode of the thin film transistor and the pixel electrode are electrically connected to each other through a through-hole formed in the organic passivation film and the interlayer insulating film;

a counter substrate; and

liquid crystal sandwiched between the thin film transistor substrate and the counter substrate;

wherein a distance between the thin film transistor substrate and the counter substrate is defined by post-like spacers formed on the counter substrate;

wherein the through-hole has

a large opening on the liquid crystal side,

a small opening on the thin film transistor substrate side, and

an inner wall extending between the large opening and the small opening; and

wherein the small opening of the through-hole is eccentric to the post-like spacer side nearest to the through-hole with respect to the large opening.

8. The liquid crystal display device according to claim 7, wherein the large opening of the through-hole has a minor axis and a major axis, and a direction of the major axis of the through-hole is a direction in which the post-like spacer and the center of the large opening of the through-hole are connected;

and

the minor axis of the through-hole is eccentric to the post-like spacer side with respect to the major axis.