LIQUID CRYSTAL DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF

• US 20080074593A1
• Filed: 08/28/2007
• Published: 03/27/2008
• Est. Priority Date: 09/22/2006
• Status: Abandoned Application

• Current Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Sano, Yasushi, Matsuura, Hiroyasu, Takanosu, Keiji, Sekiguchi, Shinji, Hara, Koji
• Application Number:
  US11/845,803
• Publication Number:
  US 20080074593A1
• Time in Patent Office: Days
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133371 Cells with varying thickness of the liquid crystal layer
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/133565 inside the LC elements, i.e. between the cell substrates
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 1/133631 with a spatial distribution of the retardation value
• CPC Class Codes: G02F 1/133633 using mesogenic materials
• CPC Class Codes: G02F 1/133638 Waveplates, i.e. plates with a retardation value of lambda/n
• CPC Class Codes: G02F 2202/023 curable

Abstract

A method of manufacturing a transflective liquid crystal display device including a plurality of pixels each having a reflective display part and a transmissive display part, and a color filter substrate including a retardation plate built in an area of a principal surface of each pixel opposed to a liquid crystal layer, which corresponds to the reflective display part, the method including in the following order: (1) a step of forming an underlayer for aligning molecules of the retardation plate; (2) a step of applying a photosetting material of the retardation plate onto the underlayer; (3) a first exposure step of selectively curing a part of the material of the retardation plate, which corresponds to the reflective display part, by light radiation through a mask; and (4) a second exposure step of heating the material of the retardation plate while exposing an entire surface thereof to light to cure the material of the retardation plate. As a result, a process of manufacturing the transflective liquid crystal display device is simplified while preventing the retardation plate from being colored.

Claims

1. A method of manufacturing a transflective IPS (In-Plane Switching) liquid crystal display device including a retardation plate, comprising:

a step of forming an underlayer for aligning molecules of the retardation plate;

a step of applying a photosetting material of the retardation plate onto the underlayer;

a first exposure step of selectively curing a part of the material of the retardation plate, which corresponds to a reflective display part, by light radiation through a mask; and

a second exposure step of heating the material of the retardation plate while exposing its entire surface to light to cure the material of the retardation plate;

wherein;

wavelength of the light radiated for curing the material of the retardation plate is at least equal to a predetermined wavelength; and

a polymerization initiator which absorbs light having a wavelength of at least the predetermined wavelength to initiate polymerization is used as the polymerization initiator for the material of the retardation plate.

2. A method of manufacturing the transflective IPS liquid crystal display device according to claim 1, wherein the material of the retardation plate is heated to a temperature of at least a nematic isotropic phase shift temperature in the second exposure step.

3. A method of manufacturing the transflective IPS liquid crystal display device according to claim 1, wherein the wavelength of the light radiated for curing the material of the retardation plate is at least 300 nm, and the polymerization initiator absorbs light having a wavelength of at least 300 nm to initiate polymerization.

4. A method of manufacturing the transflective IPS liquid crystal display device according to claim 1, wherein the light is radiated using a filter for shielding short-wavelength light.

5. A transflective IPS liquid crystal display device comprising:

a reflective display part;

a transmissive display part; and

a retardation plate built in the reflective display part, wherein;

the retardation plate is formed by curing a part of a resin layer formed over the reflective display part and the transmissive display part to keep a phase difference property of the resin layer; and

a transmittance of the resin layer is at least 90% in a visible light range.