LIQUID CRYSTAL DISPLAY

• US 20130038829A1
• Filed: 08/01/2012
• Published: 02/14/2013
• Est. Priority Date: 08/11/2011
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Katsuhiro Hoshina, Kazuya Daishi, Masato Nakamura, Tetsuya Iizuka
• Inventors: Iizuka, Tetsuya, HOSHINA, Katsuhiro, Nakamura, Masato, Daishi, Kazuya
• Granted Patent: US 9,025,101 B2
• Time in Patent Office: Days
• US Class Current: 349/140
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/1337 Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
• 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 1/134381 Hybrid switching mode, i.e. for applying an electric field with components parallel and orthogonal to the substrates
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/136277 formed on a semiconductor substrate, e.g. of silicon
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 1/1395 Optically compensated birefringence [OCB]- cells or PI- cells
• CPC Class Codes: G02F 2201/121 common or background

Abstract

According to one embodiment, a liquid crystal display includes a first substrate including a gate wire, a source wire intersecting with the gate wire, a pixel electrode with a contact portion and a main pixel electrode extending from the contact portion, and a semiconductor layer arranged under the source wire and intersecting with the gate wire and bending under the source wire so as to extend to below the contact portion, a second substrate opposed to the array substrate, and a liquid crystal layer between the first and second substrate. The semiconductor layer is electrically connected to the source wire on one side of a position of the gate wire and to the contact portion on another side of the gate wire.

Claims

1. A liquid crystal display comprising:

a first substrate comprising a gate wire, a source wire intersecting with the gate wire, a pixel electrode with a contact portion and a main pixel electrode extending from the contact portion, and a semiconductor layer arranged under the source wire and intersecting with the gate wire and bending under the source wire so as to extend to below the contact portion;

a second substrate arranged opposite the array substrate and comprising main common electrodes extending substantially parallel to the main pixel electrode on either side of the main pixel electrode; and

a liquid crystal layer comprising liquid crystal molecules between the first substrate and the second substrate,

wherein the semiconductor layer is electrically connected to the source wire on one side of a position where the semiconductor layer intersects with the gate wire and to the contact portion on another side of the position where the semiconductor layer intersects with the gate wire.

2. The liquid crystal display according to claim 1, further comprising an auxiliary capacitance line extending parallel to the gate wire in a layer identical to a layer in which the gate wire extends and intersecting with the source wire,

wherein the contact portion is arranged on the auxiliary capacitance line,

the auxiliary capacitance line comprises a cutout formed under the contact portion, and

the semiconductor layer bends at a position where the auxiliary capacitance line and the source wire intersect, so as to extend to below the contact portion, and the semiconductor layer is electrically connected to the contact portion at the cutout.

3. The liquid crystal display according to claim 1, wherein the contact portion is arranged near the gate wire, and

the main pixel electrode extends from the contact portion in a direction in which the main pixel electrode leaves the gate wire.

4. The liquid crystal display according to claim 2, wherein the contact portion is arranged near the gate wire, and

the main pixel electrode extends from the contact portion in a direction in which the main pixel electrode leaves the gate wire.

5. The liquid crystal display according to claim 1, further comprising a second gate wire extending substantially parallel to the gate wire,

the contact portion is arranged at a substantially equal distance from the gate wire and from the second gate wire, and

the main pixel electrode extends from the contact portion toward the gate wire side and the second gate wire side.

6. The liquid crystal display according to claim 2, further comprising a second gate wire extending substantially parallel to the gate wire,

the contact portion is arranged at a substantially equal distance from the gate wire and from the second gate wire, and

the main pixel electrode extends from the contact portion toward the gate wire side and the second gate wire side.

7. The liquid crystal display according to claim 3, further comprising a second gate wire extending substantially parallel to the gate wire,

the contact portion is arranged at a substantially equal distance from the gate wire and from the second gate wire, and

the main pixel electrode extends from the contact portion toward the gate wire side and the second gate wire side.

8. The liquid crystal display according to claim 1, wherein a width of the gate wire in a direction in which the semiconductor layer extends is larger at the position where the gate wire intersects with the semiconductor layer than in other portions of the gate wire.

9. The liquid crystal display according to claim 2, wherein a width of the gate wire in a direction in which the semiconductor layer extends is larger at the position where the gate wire intersects with the semiconductor layer than in other portions of the gate wire.

10. The liquid crystal display according to claim 3, wherein a width of the gate wire in a direction in which the semiconductor layer extends is larger at the position where the gate wire intersects with the semiconductor layer than in other portions of the gate wire.

11. The liquid crystal display according to claim 4, wherein a width of the gate wire in a direction in which the semiconductor layer extends is larger at the position where the gate wire intersects with the semiconductor layer than in other portions of the gate wire.

12. The liquid crystal display according to claim 1, wherein the gate wire branches so as to intersect with the gate wire at a plurality of positions.

13. The liquid crystal display according to claim 2, wherein the gate wire branches so as to intersect with the gate wire at a plurality of positions.

14. The liquid crystal display according to claim 3, wherein the gate wire branches so as to intersect with the gate wire at a plurality of positions.

15. The liquid crystal display according to claim 4, wherein the gate wire branches so as to intersect with the gate wire at a plurality of positions.

16. The liquid crystal display according to claim 1, wherein with no electric field generated between the pixel electrode and the common electrode, an initial orientation direction of each of the liquid crystal molecules in the liquid crystal layer is substantially parallel to a direction that is between 0°

and 20°

to a direction in which the main pixel electrode extends.

17. The liquid crystal display according to claim 1, wherein with no electric field generated between the pixel electrode and the common electrode, each of the liquid crystal molecules is in a splayed orientation or a homogeneous orientation between the first substrate and the second substrate.

18. The liquid crystal display according to claim 1, wherein the first substrate further comprises a first orientation film covering the pixel electrode,

the second substrate further comprises a second orientation film covering the common electrode, and

in the first orientation film, the liquid crystal molecules is initially oriented in a first orientation process direction, and in the second orientation film, the liquid crystal molecules is initially oriented in a second orientation process direction, and the first orientation process direction and the second orientation process direction are parallel to each other and are in an identical orientation.

19. The liquid crystal display according to claim 1, further comprising a first polarizing plate arranged on an outer surface of the first substrate and a second polarizing plate arranged on an outer surface of the second substrate, wherein a first polarizing axis of the first polarizing plate is orthogonal to a second polarizing axis of the second polarizing plate, and the first polarizing axis of the first polarizing plate is orthogonal or parallel to the initial orientation direction of each of the liquid crystal molecules in the liquid crystal layer.

20. A liquid crystal display comprising:

a first substrate comprising a gate wire, a source wire intersecting with the gate wire, an auxiliary capacitance line extending parallel to the gate wire in a layer identical to a layer in which the gate wire extends and intersecting with the source wire, a pixel electrode with a contact portion and a main pixel electrode extending from the contact portion, and a semiconductor layer arranged under the source wire and intersecting with the gate wire and bending under the source wire so as to extend to below the contact portion, the semiconductor layer being electrically connected to the source wire on one side of a position where the semiconductor layer intersects with the gate wire and to the contact portion on another side of the position where the semiconductor layer intersects with the gate wire;

a second substrate arranged opposite the array substrate and comprising main common electrodes extending substantially parallel to the main pixel electrode on either side of the main pixel electrode; and

a liquid crystal layer comprising liquid crystal molecules between the first substrate and the second substrate,

wherein the auxiliary capacitance line comprises a cutout formed under the contact portion, and

the semiconductor layer bends at a position where the auxiliary capacitance line and the source wire intersect, so as to extend to below the contact portion, and the semiconductor layer is electrically connected to the contact portion at the cutout.

21. A liquid crystal display comprising:

a first substrate comprising a first gate wire, a second gate wire extending parallel to the first gate wire, a source wire intersecting with the first gate wire and the second gate wire, a pixel electrode with a contact portion and a main pixel electrode extending from the contact portion, and a semiconductor layer arranged under the source wire and intersecting with the first gate wire and bending under the source wire so as to extend to below the contact portion, the semiconductor layer being electrically connected to the source wire on one side of a position where the semiconductor layer intersects with the first gate wire and to the contact portion on another side of the position where the semiconductor layer intersects with the first gate wire;

a second substrate arranged opposite the array substrate and comprising main common electrodes extending substantially parallel to the main pixel electrode on either side of the main pixel electrode; and

a liquid crystal layer comprising liquid crystal molecules between the first substrate and the second substrate,

wherein the contact portion is arranged at a substantially equal distance from the first gate wire and from the second gate wire, and

the main pixel electrode extends from the contact portion toward the first gate wire side and the second gate wire side.