Parallax barrier liquid crystal panel for stereoscopic display device and fabrication method thereof

• US 20060146208A1
• Filed: 06/28/2005
• Published: 07/06/2006
• Est. Priority Date: 12/30/2004
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Kim, Ju-Han
• Granted Patent: US 7,609,330 B2
• Time in Patent Office: Days
• US Class Current: 349/15
• CPC Class Codes: G02B 30/27 involving lenticular arrays
• CPC Class Codes: G02B 30/31 involving active parallax barriers involving directional light or back-light sources G02B30/33
• CPC Class Codes: G02F 1/13471 in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells G02F1/13475 takes precedence

Abstract

A parallax barrier liquid crystal panel for a stereoscopic display device, including a first substrate including an active region and a non-active region, a second substrate facing the first substrate, first, second, and third lines in the non-active region, at least one barrier electrode in the active region and connected to the first line, at least one pair of first and second transmission electrodes disposed adjacent to the barrier electrode and connected to the second and third lines, respectively, a common electrode on the second substrate, and a liquid crystal layer between the first and second substrates.

Claims

1. A parallax barrier liquid crystal panel for a stereoscopic display device, comprising:

a first substrate including an active region and a non-active region;

a second substrate facing the first substrate;

first, second, and third conductive lines in the non-active region;

at least one barrier electrode in the active region and connected to the first line;

at least one pair of first and second transmission electrodes disposed adjacent to the barrier electrode and connected to the second and third lines, respectively;

a common electrode on the second substrate; and

a liquid crystal layer between the first and second substrates.

2. The device according to claim 1, further comprising at least one sub-barrier electrode, the sub-barrier electrode disposed between the first and second transmission electrodes.

3. The device according to claim 1, wherein the first, second, and third lines are parallel to and spaced apart from each other.

4. The device according to claim 3, wherein one of the barrier electrode, the first transmission electrode, and the second transmission electrode and one of the first, second, and third lines cross each other.

5. The device according to claim 4, wherein the one of the barrier electrode, the first transmission electrode, and the second transmission electrode crossing the one of the first, second, and third lines has a neck shape at each crossing point.

6. The device according to claim 1, further comprising a common line connected to the common electrode and disposed in an outermost portion of the non-active region.

7. The device according to claim 1, wherein the first, second, and third lines are made of an opaque metal, and the barrier electrode, the first transmission electrode, and the second transmission electrode are made of a transparent material.

8. The device according to claim 7, wherein the opaque metal is one of aluminum (Al) and an Al alloy, and the transparent material is one of indium-tin-oxide (ITO) and indium-zinc-oxide (IZO).

9. The device according to claim 1, further comprising a first insulator between the first, second, and third lines and the barrier electrode, and a second insulator between the barrier electrode and the first and second transmission electrodes.

10. The device according to claim 9, wherein the first insulator further includes a first contact hole connecting the first line and the first barrier electrode, and the second insulator further includes a second contact hole connecting the second line and the first transmission electrode and a third contact hole connecting the third line and the second transmission electrode.

11. The device according to claim 1, further comprising a margin region between the active region and the non-active region, the margin region including the barrier electrode, the first transmission electrode, and the second transmission electrode.

12. The device according to claim 11, wherein a width of the margin region is within a range of about 0.4 mm to about 0.6 mm.

13. The device according to claim 1, further comprising a first scribing key on the first substrate corresponding to an edge of the second substrate.

14. The device according to claim 1, further comprising an electrode pad on an edge of the non-active region, the electrode pad connected to the first, second, and third lines.

15. The device according to claim 14, wherein the electrode pad is a flexible printed circuit (FPC) electrode pad.

16. A method of fabricating a parallax barrier liquid crystal panel for a stereoscopic display device, comprising:

forming first, second, and third conductive lines on a first substrate including an active region and a non-active region;

forming a first insulator on the first, second, and third lines, the first insulator including at least one first contact hole exposing the first line;

forming at least one barrier electrode on the first insulator, the barrier electrode connected to the first line through the first contact hole;

forming a second insulator on the barrier electrode, the second insulator including at least one pair of second and third contact holes exposing the second and third lines, respectively;

forming at least one pair of first and second transmission electrodes on the second insulator, the first transmission electrode connected to the second line through the second contact hole and the second transmission electrode connected to the third line through the third contact hole;

forming a second substrate including a common electrode;

attaching the first and second substrates together; and

scribing the first and second substrates.

17. The method according to claim 16, further comprising forming a sub barrier electrode between the first and second transmission electrodes.

18. The method according to claim 17, wherein one of the barrier electrode, the first transmission electrode, and the second transmission electrode and one of the first, second, and third lines cross each other.

19. The method according to claim 18, wherein the one of the barrier electrode, the first transmission electrode, and the second transmission electrode crossing the one of the first, second, and third lines has a neck shape at each crossing point.

20. The method according to claim 16, further comprising forming a common line connected to the common electrode in an outermost portion of the non-active region.

21. The method according to claim 16, further comprising forming a margin region between the active region and the non-active region and including the barrier electrode, the first transmission electrode, and the second transmission electrode.

22. The method according to claim 21, wherein a width of the margin region is within a range of about 0.4 mm to about 0.6 mm.

23. The method according to claim 16, further comprising forming first and second scribing keys on the first substrate.

24. The method according to claim 23, wherein the first and second substrates are scribed along the first and second scribing keys, respectively.

25. The method according to claim 23, wherein the first and second scribing keys are made of the same materials as the first, second, and third lines.

26. The method according to claim 16, further comprising forming an electrode pad on an edge of the non-active region connected to the first, second, and third lines.

27. The method according to claim 26, wherein the electrode pad is a flexible printed circuit (FPC) electrode pad.

28. The method according to claim 16, further comprising forming a shorting line in an exterior of the non-active region connecting the electrode pad.

29. The method according to claim 28, wherein the step of scribing the first and second substrates simultaneously removes the shorting line.

30. The device according to claim 16, wherein the first, second, and third lines are made of an opaque metal, and the barrier electrode, the first transmission electrode, and the second transmission electrode are made of a transparent material.

31. The device according to claim 30, wherein the opaque metal is one of aluminum (Al) and an Al alloy, and the transparent material is one of indium-tin-oxide (ITO) and indium-zinc-oxide (IZO).

32. A stereoscopic display device, comprising:

a liquid crystal panel;

parallax barrier liquid crystal panel including;

a first substrate including an active region and a non-active region,

a second substrate facing the first substrate,

first, second, and third conductive lines in the non-active region,

at least one barrier electrode in the active region and connected to the first line,

at least one pair of first and second transmission electrodes disposed adjacent to the barrier electrode and connected to the second and third lines, respectively,

a common electrode on the second substrate, and

a liquid crystal layer between the first and second substrates; and

a control circuit for selectively driving the stereoscopic display device in one of a two-dimensional (2-D) mode and a three-dimensional (3-D) mode, wherein

the 2-D mode is selected when no driving voltage is applied to the first, second, and third lines, thereby placing the barrier electrode and the first and second transmission electrodes in a white state, and

the 3-D mode is selected when a driving voltage is applied to the first line and alternatingly applied to the second and third lines, thereby placing the barrier electrode in a black state, and placing the first and second transmission electrodes alternating between a black state and a white state.

33. The stereoscopic display device according to claim 32, wherein the parallax barrier liquid crystal panel further comprising at least one sub-barrier electrode, the sub-barrier electrode disposed between the first and second transmission electrodes and connected to the first line, whereby the barrier electrode and the sub barrier electrode are driven together by control circuit.

34. The stereoscopic display device according to claim 32, wherein the first transmission electrode and the second transmission electrode have opposite states in a driving period in the 3-D mode.