IP Library Granted Patent US 7,429,412
Granted Patent B2
US 7,429,412 · App. 09/968,652 · Granted Sep 30, 2008

Liquid crystal display device and method for manufacturing the same

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Quick Facts
Patent No.
US 7,429,412
App. No.
09/968,652
Granted
Sep 30, 2008
Kind
B2
Abstract

A liquid crystal display device includes a first substrate; a second substrate; a first alignment layer on the first substrate, the first alignment layer including a first additive; a second alignment layer on the second substrate; and a liquid crystal layer between the first substrate and the second substrate.

Claims (12)

1. A liquid crystal display device, comprising:

a first substrate;

a second substrate;

a first alignment layer on the first substrate;

a second alignment layer on the second substrate; and

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

wherein the first alignment layer includes a photo-alignment layer which is irradiated with light that is non-polarized, linearly polarized, or partially polarized, at least one time in the vertical direction and/or an inclined direction, the photo-alignment layer including a cross linking agent, an additive, and a photo-initiator for reducing an image-sticking in the liquid crystal display device and for inducing photo-stability of the first alignment layer,

the additive increasing the cross linking index of the photo-alignment later, and is selected from a group consisting of benzotriazols and silanes having a concentration of at least 4% but less than 8% of the solid concentration of the photo-alignment layer, and

the photo-initiator having a concentration that is greater than 0% but less than or equal to 50% of the solid concentration of the additive, and is not greater than 4% of the solid concentration in the photo-alignment layer, such that ΔT of the liquid crystal display device is less than 0.03 for reducing the image-sticking, wherein ΔT=T 1 /(T 1 −T 2 )×100(%), where T 1 represents the transmittance before applying an AC stress to a liquid crystal cell, and T 2 represents the transmittance after applying the AC stress to the liquid crystal cell.

2. The device of claim 1 , wherein the second alignment layer also includes the photo-alignment layer.

3. The device of claim 1 , wherein the second alignment layer includes a rubbed film.

4. The device of claim 3 , wherein the rubbed film includes material selected from a group consisting of polyimides, polyamides, and polyamic acids.

Assignments (2)
CHANGE OF NAME Recorded Jun 19, 2008
From: LG.PHILIPS LCD CO., LTD.
To: LG DISPLAY CO., LTD.
Reel/Frame 021147/0009 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 3, 2001
From: NAM, MI SOOK; PARK, SU HYUN
To: LG.PHILIPS LCD CO., LTD.
Reel/Frame 012229/0411 →