IP Library › Granted Patent US 7,180,568
Granted Patent B2
US 7,180,568 · App. 10/873,140 · Granted Feb 20, 2007

Method for fabricating liquid crystal display device

Assignee: LG.Philips LCD Co., Ltd.
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Quick Facts
Patent No.
US 7,180,568
App. No.
10/873,140
Granted
Feb 20, 2007
Kind
B2
Abstract

A method for fabricating a liquid crystal display device includes: forming alignment keys by at least one of ink jet printing, offset printing, screen printing and laser marking on a dummy region of an upper substrate; forming a first alignment film over an active region of the upper substrate; forming sealant along a periphery of the active region of the upper substrate; and bonding the upper substrate to a lower substrate.

Claims (16)

1. A method for fabricating a liquid crystal display device comprising the steps of:

forming alignment keys on a dummy region of an upper substrate;

forming a first alignment film over an active region of the upper substrate;

forming sealant along a periphery of the active region of the upper substrate; and

bonding the upper substrate to a lower substrate;

wherein a distance between the sealant on the upper substrate and the first alignment film is approximately 0.5˜1 mm.

2. The method as claimed in claim 1 , wherein the lower substrate includes:

an active region having pixel regions defined therein;

RGB color layers in the pixel regions;

a light shielding film on a periphery of the active region of the lower substrate; and

a second alignment film on a part of the lower substrate opposite to the first alignment film on the upper substrate.

3. The method as claimed in claim 2 , wherein a distance between the sealant on the upper substrate and the second alignment film is approximately 0.5˜1 mm.

4. The method as claimed in claim 1 , wherein the alignment keys are at least one of an alignment film printing key, a bonding key, and a seal printing key.

5. The method as claimed in claim 1 , wherein forming the alignment keys has a precision at a level of 1 mm unit.

6. The method as claimed in claim 1 , wherein the alignment key is formed by ink jet printing.

7. The method as claimed in claim 6 , wherein forming alignment keys by ink jet printing includes dropping ink on desired parts of the dummy region of the upper substrate upon reception of a signal to dispense ink using an ink jet apparatus, wherein the ink jet apparatus has an ink jet head, a vertical head driver with a shaft for moving the ink jet head in up/down directions with respect to the upper substrate, and upper and lower head drivers for moving the ink jet head, and the vertical head driver in left and right directions.

Assignments (2)
CHANGE OF NAME Recorded Oct 17, 2008
From: LG.PHILIPS LCD CO., LTD.
To: LG DISPLAY CO., LTD.
Reel/Frame 021754/0230 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 23, 2004
From: LEE, YUN BOK; KIM, WOO HYUN
To: LG.PHILIPS LCD CO., LTD.
Reel/Frame 015513/0533 →
Priority Claims (1)
KR 10-2003-0042965 · Jun 28, 2003 · national
Continuity (1)
Related Publication 20040263769A1 · Dec 30, 2004