LIQUID CRYSTAL DISPLAY PANEL AND METHOD FOR MANUFACTURING THE SAME

• US 20090279009A1
• Filed: 04/28/2009
• Published: 11/12/2009
• Est. Priority Date: 05/12/2008
• Status: Active Grant

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Epson Imaging Devices Corporation (Seiko Group)
• Inventors: KAKEHI, Kennosuke, IMAI, Katsuhiro, KIYOSE, Kanechika, TAGUCHI, Satoshi
• Granted Patent: US 8,154,675 B2
• Time in Patent Office: Days
• US Class Current: 349/40
• CPC Class Codes: G02B 5/3025 Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state G02B5/3008, G02B5/3016 take precedence
• CPC Class Codes: G02F 1/133334 Electromagnetic shields
• 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 1/136218 Shield electrodes
• CPC Class Codes: G02F 2202/28 Adhesive materials or arrangements
• CPC Class Codes: H01L 27/0248 for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection

Abstract

A lateral electric field liquid crystal display panel is provided which includes a pair of substrates, a liquid crystal enclosed between the pair of substrates, liquid crystal-drive electrodes provided on one of the pair of substrates, a translucent electrostatic shielding layer provided on an exterior surface of at least one of the pair of substrates, and a polarizer disposed on the translucent electrostatic shielding layer, and in this liquid crystal display panel, the translucent electrostatic shielding layer has properties not to disappear by a chemical reaction with a material forming the polarizer.

Claims

1. A lateral electric field liquid crystal display panel comprising:

a pair of substrates;

a liquid crystal enclosed therebetween;

liquid crystal-drive electrodes provided on one of the pair of substrates;

a translucent electrostatic shielding layer provided on an exterior surface of at least one of the pair of substrates; and

a polarizer disposed on the translucent electrostatic shielding layer,

wherein the translucent electrostatic shielding layer has properties not to disappear by a chemical reaction with a material forming the polarizer.

2. The liquid crystal display panel according to claim 1, wherein the translucent electrostatic shielding layer includes a transparent conductive film or a conductive adhesive in which conductive particles are dispersed in an adhesive which is adhered to the polarizer.

3. The liquid crystal display panel according to claim 2, wherein the transparent conductive film or the conductive particles primarily includes SnO₂ or a mixture of SnO₂ and at least one other metal.

4. The liquid crystal display panel according to claim 3, wherein the mixture of SnO₂ and at least one other metal further includes at least one of Ta₂O_5, Nb₂O₅, and TiO₂.

5. The liquid crystal display panel according to claim 1, wherein the translucent electrostatic shielding layer has a thickness of 100 to 200 Å

.

6. The liquid crystal display panel according to claim 1, wherein the translucent electrostatic shielding layer has a sheet resistance of 9×

10⁶ Ω

/□

or less and a transmittance of 90% or more.

7. The liquid crystal display panel according to claim 1, further comprising a ground terminal provided for one of the pair of substrates, wherein the ground terminal is electrically connected to the electrostatic shielding layer.

8. A method for manufacturing a liquid crystal display panel comprising the steps of:

(a) preparing a pair of substrates which are a first substrate provided with liquid crystal-drive electrodes and a second substrate disposed to face the first substrate, applying a sealing material to a non-display region of one of the pair of substrates, and adhering the pair of substrates to each other to form a space having a predetermined size inside surrounded by the sealing material;

(b) forming an electrostatic shielding layer having properties not to disappear by a chemical reaction with a polarizer forming material on at least one exterior surface of one of the pair of substrates obtained in the step (a); and

(c) adhering polarizers to two exterior side surfaces of the pair of substrates after the step (b).

9. The method for manufacturing a liquid crystal display panel according to claim 8, further comprising, between the steps (a) and (b), performing mechanical polishing or chemical etching on a surface of the pair of substrates obtained in the step (a) to decrease the thickness.