Liquid crystal display and method for manufacturing the same

• US 20070046869A1
• Filed: 05/12/2006
• Published: 03/01/2007
• Est. Priority Date: 08/23/2005
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Chen, Po-Lun, Wu, Po-Chang, Chang, Chih-Ming, Wu, Jin-Jei, Hsieh, Fu-Cheng, Huang, Ren-Hung, Lin, Tzu-Yuan, Chiang, Chun-Hung
• Granted Patent: US 7,688,407 B2
• Time in Patent Office: Days
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133753 with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
• CPC Class Codes: G02F 1/133757 with different alignment orientations
• CPC Class Codes: G02F 1/133773 the alignment material or treatment being different for the two opposite substrates
• CPC Class Codes: G02F 1/133788 by light irradiation, e.g. linearly polarised light photo-polymerisation
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]

Abstract

A liquid crystal display with transmissive region and reflective region is provided. The display comprises an upper substrate and a lower substrate, which is settled in parallel with the upper substrate. A reflective layer is located on the reflective region of the lower substrate and an insulation layer covers the reflective layer and the lower substrate. Positive and negative driving electrodes are chiastically settled on the insulation layer. A first alignment film is positioned on the inner surface of the upper substrate, and the alignments of the first alignment film on the transmissive region and reflective region are different. A second alignment film covers the insulation layer, the positive and negative electrodes. A liquid crystal layer is located between the first alignment film and the second alignment film.

Claims

1. A liquid crystal display (LCD) panel with a transmissive region and a reflective region, comprising:

an upper substrate;

a lower substrate arranged in parallel with the upper substrate;

a reflective layer disposed on the reflective region of the lower substrate;

an insulating layer covering the lower substrate and the reflective layer;

a plurality of positive driving electrodes and a plurality of negative driving electrodes arranged alternately on the insulating layer;

a first alignment film, formed on the surface of the upper substrate between the upper and lower substrates, having different alignments in the transmissive region and reflective region, respectively;

a second alignment film with a single alignment covering the reflective layer and the insulating layer; and

a liquid crystal layer interposed between the first alignment film and the second alignment film.

2. The LCD panel of claim 1, further comprising a polarization film disposed on the outer surfaces of the upper and lower substrates, respectively.

3. The LCD panel of claim 1, wherein the first alignment film and the second alignment film in the transmissive region have a homogeneous alignment.

4. The LCD panel of claim 1, wherein the first alignment film and the second alignment film in the reflective region have a hybrid alignment.

5. The LCD panel of claim 1, wherein the first. alignment film is substantially made of a UV curable polymer.

6. The LCD panel of claim 1, wherein the reflective layer comprises a reflective electrode.

7. The LCD panel of claim 1, wherein the insulating layer has a single-layer structure.

8. The LCD panel of claim 1, wherein the insulating layer has multiple-layer structure.

9. A method for manufacturing a transflective LCD panel having a transmissive region and a reflective region, the method comprising:

providing an upper substrate;

forming a first alignment film on the upper substrate, including the steps of;

forming a UV curable polymer layer on the upper substrate; and

irradiating a UV beam on the UV curable polymer layer so that the UV curable polymer layer different alignments in the transmissive region and the reflective region;

providing a lower substrate;

forming a reflective layer on the reflective region of the lower substrate;

forming an insulating layer to cover the reflective layer and the lower substrate;

forming positive driving electrodes and negative driving electrodes on the insulating layer, alternately;

forming a second alignment film to cover the insulating layer, the positive driving electrodes and the negative driving electrodes;

using a UV glue to package the upper substrate and the lower substrate so that the first alignment film and the second alignment film are opposite to each other; and

filling liquid crystal molecules between the first alignment film and the second alignment film.

10. The method of claim 9, wherein the first alignment film and the second alignment film in the transmissive region have a homogeneous alignment.

11. The method of claim 9, wherein the first alignment film and the second alignment film in the reflective region have a hybrid alignment.

12. The method of claim 9, wherein formation of the second alignment film comprises performing photo-alignment, rubbing, ion-beam, or tilt evaporation techniques.

13. The method of claim 9, wherein the insulating layer is substantially made of silicon nitride, silicon oxide, or silicon oxide nitride.

14. The method of claim 9, wherein irradiating a UV beam on the UV curable polymer layer comprises covering the UV curable polymer layer in the transmissive region by a photo resist layer and irradiating the UV curable polymer layer in the reflective region with the UV beam.