Liquid crystal display device using cholesteric liquid crystal and a manufacturing method thereof

• US 6,774,962 B2
• Filed: 06/20/2002
• Issued: 08/10/2004
• Est. Priority Date: 11/08/2001
• Status: Expired due to Term

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Yoon, Sunghoe
• Primary Examiner(s): NGO, HUYEN LE
• Application Number:
  US10/175,491
• Publication Number:
  US 20030086032A1
• Time in Patent Office: 782 Days
• Field of Search: 349/96-98
• US Class Current: 349/98
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses
• CPC Class Codes: G02F 1/13718 based on a change of the texture state of a cholesteric liquid crystal

Abstract

A liquid crystal display device includes a liquid crystal cell having a cholesteric liquid crystal color filter; an integrated collimating polarizer under the liquid crystal cell, the integrated collimating polarizer having a collimating layer and a circular polarizer on the collimating layer; a backlight under the integrated collimating polarizer; a diffusing layer over the liquid crystal cell; a retardation layer over the diffusing layer; and a linear polarizer over the retardation layer.

Claims

1. A liquid crystal display device, comprising:

a liquid crystal cell;

a collimating polarizer under the liquid crystal cell, the collimating polarizer having a collimating layer and a circular polarizer which is fixed on the collimating layer;

a backlight under the collimating polarizer;

a diffusing layer over the liquid crystal cell;

a retardation layer over the diffusing layer; and

a linear polarizer over the retardation layer.

2. The device according to claim 1, wherein the circular polarizer has cholesteric liquid crystal.

3. The device according to claim 1, wherein the collimating layer has a condensing pattern and the condensing pattern is one of prism pattern, holographic pattern and micro lens pattern.

4. The device according to claim 1, wherein the collimating layer has a condensing pattern, wherein the collimating pattern is a micro lens pattern and wherein the micro lens pattern is an array.

5. The device according to claim 1, wherein the diffusing layer is holographic pattern.

6. The device according to claim 1, wherein the liquid crystal cell includes first and second substrates facing each other and having respective electrodes on inner sides of the first and second substrates, and a liquid crystal layer between the respective electrodes.