Method for manufacturing a liquid crystal display device with optically compensated bend mode

Abstract

A method for manufacturing a substrate of a flat panel display device is disclosed. The method includes following steps: providing a substrate having patterned transparent electrode thereon; and forming an alignment layer on the surface of the transparent electrode. The formed alignment layer includes a homeotropic alignment film and a homogeneous alignment film adjacent to the homeotropic alignment film. Moreover, the homeotropic alignment film is formed utilizing printing on or on a periphery of to the homogeneous alignment film. Through this method, the flat panel display device can be manufactured without increasing the quantity of the mask cycles, and without a complex process of gradation exposure. Moreover, the problem resulted from multiple rubbing can be reduced, and the cost for manufacturing can be decreased.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A to 1D show the steps for manufacturing alignment films according to a conventional method;

FIG. 2A shows a schematic drawing of forming a homeotropic alignment film over a substrate utilizing ink-jet printing according to a preferred embodiment of the present invention;

FIG. 2B shows a schematic drawing of forming a homeotropic alignment film over a substrate utilizing roller printing according to another preferred embodiment of the present invention;

FIG. 3A shows a schematic drawing of a top substrate with a color filter of a flat panel display device according to a preferred embodiment of the present invention;

FIG. 3B shows a bottom substrate with a thin film transistor of a flat panel display device according to a preferred embodiment of the present invention;

FIG. 4A shows a top substrate with a color filter of a flat panel display device according to another preferred embodiment of the present invention;

FIG. 4B shows a bottom substrate with a thin film transistor of a flat panel display device according to another preferred embodiment of the present invention;

FIG. 5A shows a top substrate of a flat panel display device according to a further preferred embodiment of the present invention; and

FIG. 5B shows a bottom substrate with a color filter and a thin film transistor of a flat panel display device according to a further preferred embodiment of the present invention.

Claims

1. A method for manufacturing a substrate of a flat panel display device, comprising the following steps: providing a substrate having a patterned transparent electrode thereon; andforming an alignment layer on the surface of the patterned transparent electrode, wherein the alignment layer comprises a homeotropic alignment film and a homogeneous alignment film adjacent to the homeotropic alignment film,wherein the homeotropic alignment film is formed on or on a periphery of the homogeneous alignment film by printing.

2. The method as claimed in claim 1, wherein the homeotropic alignment film is formed on the homogeneous alignment film by ink-jet printing.

3. The method as claimed in claim 1, wherein the homeotropic alignment film is formed on the periphery of the homogeneous alignment film by ink-jet printing.

4. The method as claimed in claim 1, wherein the homeotropic alignment film is formed on the homogeneous alignment film by roller printing.

5. The method as claimed in claim 1, wherein the homeotropic alignment film is formed on the periphery of the homogeneous alignment film by roller printing.

6. The method as claimed in claim 1, wherein the homogeneous alignment film is formed by printing or photolithography.

7. The method as claimed in claim 1, wherein the homeotropic alignment film is formed over an opaque area of the substrate.

8. The method as claimed in claim 5, wherein the homeotropic alignment film makes the nematic liquid crystal molecules to tilt at a pretilt angle larger than 60 degrees.

9. The method as claimed in claim 1, wherein the homogeneous alignment film is formed over an opaque area or a transparent area of the substrate.

10. The method as claimed in claim 1, wherein a material of the homogeneous alignment film is polyimide.

11. The method as claimed in claim 1, wherein a material of the homeotropic alignment film is polyimide.

12. The method as claimed in claim 1, wherein the substrate of the flat panel display device further comprises a color filter.

13. The method as claimed in claim 1, wherein the substrate of the flat panel display device further comprises a thin film transistor.

14. The method as claimed in claim 1, wherein the substrate of the flat panel display device further comprises a color filter and a thin film transistor.