Liquid crystal display device

Abstract

A liquid crystal display device includes a first substrate; a second substrate facing the first substrate; a liquid crystal layer interposed between the first and second substrates; first, second, third, and fourth sub-pixels defined on the first and second substrates; a first electric field distorting pattern on the first, second and third sub-pixels on the first substrate; a second electric field distorting pattern on the first, second and third sub-pixels on the second substrate; a third electric field distorting pattern on the fourth sub-pixel on the first substrate; and a fourth electric field distorting pattern on the fourth sub-pixel on the second substrate, wherein the first and second electric field distorting patterns are parallel to each other, and wherein the third and fourth electric field distorting patterns are parallel to each other at an angle that is different than that of the first and second distorting patterns.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is an exploded perspective viewing of an LCD device according to the related art.

FIGS. 2A and 2B are cross-sectional views of an IPS mode LCD device and a VA mode LCD device, respectively, according to the related art.

FIGS. 3A and 3B are plane views of an array substrate and a color filter substrate for an exemplary viewing angle restricting LCD device according to the present invention.

FIGS. 4A to 4D are graphs showing a transmittance on sub-pixels of an exemplary viewing angle restricting LCD device according to the present invention.

FIGS. 5A and 5B are plane views of an array substrate and a color filter substrate for an exemplary viewing angle restricting LCD device according to the present invention, respectively.

FIGS. 6A to 6F show an array substrate for an exemplary viewing angle restricting LCD device according to the present invention.

Claims

1. A liquid crystal display device, comprising: a first substrate;a second substrate facing the first substrate;a liquid crystal layer interposed between the first and second substrates;first, second, third, and fourth sub-pixels defined on the first and second substrates;a first electric field distorting pattern on the first, second and third sub-pixels on the first substrate;a second electric field distorting pattern on the first, second and third sub-pixels on the second substrate;a third electric field distorting pattern on the fourth sub-pixel on the first substrate; anda fourth electric field distorting pattern on the fourth sub-pixel on the second substrate,wherein the first and second electric field distorting patterns are parallel to each other, andwherein the third and fourth electric field distorting patterns are parallel to each other at an angle that is different than that of the first and second distorting patterns.

2. The device according to claim 1, wherein the first and second electric field distorting patterns are alternately arranged and the third and fourth electric field distorting patterns are alternately arranged.

3. The device according to claim 1, wherein the first, second, third and fourth electric field distorting patterns include a dielectric material having one of a rib pattern and a slit pattern.

4. The device according to claim 1, wherein each of the first, second and third sub-pixels includes one of red, green, and blue colors.

5. The device according to claim 1, wherein the sub-pixels are defined by: a plurality of gate lines along a first direction on the first substrate;a plurality of data lines crossing the plurality of gate lines to define the first, second, third and fourth sub-pixels; anda plurality of thin film transistors connected to the plurality of gate lines and the plurality of data lines.

6. The device according to claim 5, wherein the first and second distorting patterns have a zigzag shape that is oblique to the gate lines.

7. The device according to claim 5, wherein the third and fourth distorting patterns are one of parallel and perpendicular with respect to the gate lines.

8. The device according to claim 1, wherein the first, second, third, and fourth sub-pixels are arranged in one of a matrix shape and a stripe shape.

9. The device according to claim 8, wherein the sub-pixels are further defined by: a plurality of pixel electrode formed in each of the first, second, third, and fourth sub-pixels on an inner surface of the first substrate, the plurality of pixel electrodes connected to the plurality of thin film transistors; anda common electrode on an inner surface of the second substrate.

10. The device according to claim 1, further comprising: a fifth sub-pixel defined on the first and second substrates;a fifth electric field distorting pattern on the fifth sub-pixel on the first substrate; anda sixth electric field distorting pattern on the fifth sub-pixel on the second substrate,wherein the fifth and sixth electric field distorting patterns are parallel to each other and perpendicular to the data lines.

11. The device according to claim 10, further comprising alternately arranged first and second unit pixels, wherein the first unit pixel includes the first, second, third and fourth sub-pixels, and the second unit pixels includes the first, second, third and fifth sub-pixels.

12. The device according to claim 1, further comprising a first polarizer having a first optical axis on an outer surface of the first substrate and a second polarizer having a second optical axis on an outer surface of the second substrate.

13. The device according to claim 12, wherein the first optical axis is perpendicular to the second optical axis.

14. The device according to claim 12, wherein the third and fourth electric filed distorting patterns are parallel to one of the first and second optical axes.

15. A liquid crystal display device, comprising: a first substrate;a second substrate facing the first substrate;a liquid crystal layer interposed between the first and second substrates; andfirst, second, third, and fourth sub-pixels defined on the first and second substrates, the first, second, and third sub-pixels having electric field distorting patterns to increase viewing angle, and the fourth sub-pixel having electric field distorting patterns to restrict viewing angle.

16. The liquid crystal display device according to claim 15, further comprising: a fifth sub-pixel defined on the first and second substrates; alternately arranged first and second unit pixels,wherein the first unit pixel includes the first, second, third and fourth sub-pixels, and the second unit pixels includes the first, second, third and fifth sub-pixels.

17. The liquid crystal display device according to claim 16, wherein the first, second, third, and fourth sub-pixels are arranged in one of a matrix shape and a stripe shape.

18. The liquid crystal display device according to claim 16, wherein the first, second, third, and fifth sub-pixels are arranged in one of a matrix shape and a stripe shape.

19. A liquid crystal display device, comprising: a first substrate;a second substrate facing the first substrate;a liquid crystal layer interposed between the first and second substrates; anda pixel array defined on the first and second substrates, each pixel of the pixel array including at least first, second, third and fourth sub-pixels such that the fourth sub-pixel has a restricted viewing angle as compared to the first, second, and third sub-pixels.