Liquid crystal display device

• US 10,162,228 B2
• Filed: 12/22/2014
• Issued: 12/25/2018
• Est. Priority Date: 12/23/2013
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Lim, DongHun, You, JaeYong
• Primary Examiner(s): Xavier, Antonio
• Application Number:
  US14/579,904
• Publication Number:
  US 20150177579A1
• Time in Patent Office: 1,464 Days
• Field of Search: None
• CPC Class Codes: G02F 1/134336 Matrix
• 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 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence

Abstract

A liquid crystal display device including first, second, and third data lines extending in a first direction on a substrate, the second data line positioned between the first and third data lines; a plurality of gate lines extending in a second direction on the substrate; at least one pixel unit including a first pixel electrode formed in a first pixel area between the first and third data lines intersecting the gate lines, at one side of a first gate line, and a second pixel electrode formed in a second pixel area between the first and third data lines, at another side of the first gate line; and at least one circuit unit formed between the first pixel area and the second pixel area and including a first transistor in which a first electrode of the first transistor is connected to the first data line and a second electrode of the first transistor is connected to the first pixel electrode, and a second transistor in which a third electrode of the first transistor is connected to the third data line and a fourth electrode of the first transistor is connected to the second pixel electrode.

Claims

1. A liquid crystal display device, comprising:

first, second, and third data lines extending in a first direction on a substrate, the second data line positioned between the first and third data lines;

a plurality of gate lines extending in a second direction on the substrate;

at least one pixel unit including a first pixel electrode formed in a first pixel area between the first and third data lines intersecting the gate lines, at one side of a first gate line, and a second pixel electrode formed in a second pixel area between the first and third data lines, at another side of the first gate line; and

at least one circuit unit formed between the first pixel area and the second pixel area and including a first transistor in which a first electrode of the first transistor is connected to the first data line and a second electrode of the first transistor is connected to the first pixel electrode, and a second transistor in which a third electrode of the second transistor is connected to the second data line and a fourth electrode of the second transistor is connected to the second pixel electrode,

wherein the second data line bisects the first and second pixel electrodes, and the first and second pixel electrodes are defined across the second data line,

wherein each of the first and second pixel electrodes has a plurality of slits, and

wherein the plurality of slits in each of the first and second pixel electrodes are oriented in a direction of the gate lines, not in a direction of the data lines so that the plurality of slits intersect the second data line.

2. The liquid crystal display device of claim 1, further comprising:

fourth and fifth data lines,

wherein the at least one pixel unit includes a third pixel electrode formed in a third pixel area between the third and fifth data lines intersecting the gate lines, at the one side of the first gate line, and a fourth pixel electrode formed in a fourth pixel area between the third and fifth data lines, at the another side of the first gate line, and

wherein the plurality of slits in the first pixel electrode are in a first diagonal direction for a first domain and the third pixel electrode includes slits in a second diagonal direction for a second domain.

3. The liquid crystal display device of claim 2, wherein the fourth data line is between the third and fifth data lines,

wherein the slits in the first pixel electrode are symmetrical to the slits in the third pixel electrode, and

wherein angles of all of the slits in the first pixel electrode are positive and angles of all of the slits in the third pixel electrode are negative.

4. The liquid crystal display device of claim 2, wherein the slits in the first and third pixel electrodes are in third and fourth directions, respectively, in the substrate,

wherein the first and second directions are vertical and horizontal, respectively, and the third and fourth directions are diagonal, and

wherein the slits in the first pixel electrode are symmetrical to the slits in the third pixel electrode.

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

a gate electrode formed on the substrate;

a gate insulation layer formed on the gate electrode, wherein the second electrode is formed on the gate insulation layer;

source and drain areas formed on the gate insulation layer on opposite sides of the second electrode; and

source and drain electrodes formed on the source and drain areas, respectively.

6. The liquid crystal display device of claim 5, further comprising:

an inter-layer insulation layer formed on the source and drain electrodes, the second electrode, and the gate insulation layer;

a common electrode formed on the inter-layer insulation layer;

a protection layer formed on the inter-layer insulation layer; and

a contact hole formed through the inter-layer insulation layer and the protection layer,

wherein the first pixel electrode and the second pixel electrode are formed diagonally to the data lines and the gate lines, and

wherein the first electrode and the second electrode are connected to a semiconductor layer.

7. The liquid crystal display device of claim 6, wherein the fourth data line overlaps the third pixel area and is between the third and fifth data lines, and

wherein the slits in the first pixel electrode are symmetrical to the slits in the third pixel electrode.

8. A liquid crystal display device, comprising:

first, second, and third data lines extending in a first direction on a substrate;

a plurality of gate lines extending in a second direction on the substrate;

at least one pixel unit including a first pixel electrode formed in a first pixel area between the first and third data lines intersecting the gate lines, at one side of a first gate line, and a second pixel electrode formed in a second pixel area between the first and third data lines, at another side of the first gate line; and

at least one circuit unit formed between the first pixel area and the second pixel area and including a first transistor in which a first electrode of the first transistor is connected to the first data line and a second electrode of the first transistor is connected to the first pixel electrode, and a second transistor in which a third electrode of the second transistor is connected to the second data line and a fourth electrode of the second transistor is connected to the second pixel electrode,

wherein the second data line bisects the first and second pixel electrodes, and the first and second pixel electrodes are defined across the second data line,

wherein each of the first and second pixel electrodes has a plurality of slits, and

wherein the plurality of slits in each of the first and second pixel electrodes are oriented in a direction of the gate lines, not in a direction of the data lines so that the plurality of slits intersect the second data line.

9. The liquid crystal display device of claim 8, further comprising:

fourth and fifth data lines,

wherein the at least one pixel unit includes a third pixel electrode formed in a third pixel area between the third and fifth data lines intersecting the gate lines, at the one side of the first gate line, and a fourth pixel electrode formed in a fourth pixel area between the third and fifth data lines, at the another side of the first gate line,

wherein the plurality of slits in the first pixel electrode are in a first diagonal direction for a first domain and the third pixel electrode includes slits in a second diagonal direction for a second domain, and

wherein the fourth data line is positioned between the third and fifth data lines to intersect the third pixel area.

10. The liquid crystal display device of claim 9, wherein the fourth data line is between the third and fifth data lines,

wherein the slits in the first pixel electrode are symmetrical to the slits in the third pixel electrode, and

wherein angles of all of the slits in the first pixel electrode are positive and angles of all of the slits in the third pixel electrode are negative.

11. The liquid crystal display device of claim 9, wherein the slits in the first and third pixel electrodes are in third and fourth directions, respectively, in the substrate,

wherein the first and second directions are vertical and horizontal, respectively, and the third and fourth directions are diagonal, and

wherein the slits in the first pixel electrode are symmetrical to the slits in the third pixel electrode.

12. The liquid crystal display device of claim 8, further comprising:

a gate electrode formed on the substrate;

a gate insulation layer formed on the gate electrode, wherein the second electrode is formed on the gate insulation layer;

source and drain areas formed on the gate insulation layer on opposite sides of the second electrode; and

source and drain electrodes formed on the source and drain areas, respectively.

13. The liquid crystal display device of claim 12, further comprising:

an inter-layer insulation layer formed on the source and drain electrodes, second electrode, and gate insulation layer;

a common electrode formed on the inter-layer insulation layer;

a protection layer formed on the inter-layer insulation layer; and

a contact hole formed through the inter-layer insulation layer and protection layer,

wherein the first pixel electrode and the second pixel electrode are formed diagonally to the data lines and the gate lines, and

wherein the first electrode and the second electrode are connected to a semiconductor layer.

14. A liquid crystal display device, comprising:

first, second, and third data lines on a substrate, the second data line located between the first and third data lines;

a plurality of gate lines on the substrate;

a first pixel electrode in a first pixel area between the first and third data lines intersecting the gate lines, at one side of a first gate line, and a second pixel electrode in a second pixel area between the first and third data lines, at another side of the first gate line;

a first transistor connected to the first data line and the first pixel electrode; and

a second transistor connected to the second data line and the second pixel electrode,

wherein the second data line bisects the first and second pixel electrodes, and the first and second pixel electrodes are defined across the second data line,

wherein each of the first and second pixel areas has a plurality of slits, and

wherein the plurality of slits in each of the first and second pixel areas are oriented in a direction of the gate lines, not in a direction of the data lines so that the plurality of slits intersect the second data line.

15. The liquid crystal display device of claim 14, wherein the first and second transistors are located between the first and second pixel areas.

16. The liquid crystal display device of claim 14, wherein the first and second transistors are on the first gate line.

17. The liquid crystal display device of claim 14, wherein the slits in the first pixel area are aligned with the slits in the second pixel area.

18. A liquid crystal display (LCD) device comprising:

a substrate having a matrix of conductive lines comprised of data lines and gate lines that extend perpendicular to and intersect with the data lines; and

a pixel structure on the substrate at or near regions where the data lines and gate lines intersect, the pixel structure comprising an array of pixel units in a row direction and a column direction, each pixel unit defined between two data lines with a gate line spanning across the two data lines in a bisecting manner with respect to the pixel unit to define a first pixel area and a second pixel area,

the first pixel area having a first pixel electrode and the second pixel area having a second pixel electrode, each of the first and second pixel electrodes having a plurality of slits oriented to be bisected by one of the data lines.

19. The LCD device of claim 18, wherein the first and second pixel electrodes respectively have a length in the direction of the gate lines that is greater than a length in the direction of the data lines.

20. The LCD device of claim 19, wherein the pixel structure further comprises a circuit area between the first and second pixel areas, and the circuit area has a width that is less than a width of the gate line.

21. The LCD device of claim 20, wherein the circuit area is a particular circuit area including at least one thin film transistor (TFT) having oxide material as an active layer of the of the pixel structure, and the first and second pixel areas between which the particular circuit area is formed have an aperture ratio.

22. The LCD device of claim 21, wherein the first pixel area is related to a first color and the second pixel area is related to a second color that is different from the first color.

23. The LCD device of claim 22, wherein the pixel units are aligned in both the row direction and the column direction.

24. The LCD device of claim 22, wherein the pixel units have a staggered arrangement with respect to either the row direction or the column direction.

25. The LCD device of claim 18, wherein the one of the data lines that bisects the plurality of slits also bisects both the first pixel electrode and the second pixel electrode.