VERTICALLY ALIGNED LIQUID CRYSTAL DISPLAY DEVICE HAVING AN OPTIMIZED VIEWING ANGLE

• US 20100285714A1
• Filed: 07/19/2010
• Published: 11/11/2010
• Est. Priority Date: 07/12/2002
• Status: Abandoned Application

• Current Assignee: Sang-Ii Kim, Tae-Hwan Kim, Young-Chol Yang
• Original Assignee: Sang-Ii Kim, Tae-Hwan Kim, Young-Chol Yang
• Inventors: Kim, Sang-II, Yang, Young-Chol, KIM, Tae-Hwan
• Application Number:
  US12/839,015
• Publication Number:
  US 20100285714A1
• Time in Patent Office: Days
• US Class Current: 445/24
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 1/133634 the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis
• CPC Class Codes: G02F 1/133637 characterised by the wavelength dispersion
• CPC Class Codes: G02F 1/1393 the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells G02F1/1396, G02F1/141 take precedence
• CPC Class Codes: G02F 2202/40 Materials having a particular birefringence, retardation
• CPC Class Codes: G02F 2413/04 Number of plates greater than or equal to 4

Abstract

A method of improving the viewing angle of a vertically-aligned liquid crystal display device is presented. The method involves designing a uniaxial compensation film to provide a retardation value of 200 nm or less for light having a wavelength of about 550 nm. Using this uniaxial compensation film, a display device can be built by obtaining a liquid crystal panel with liquid crystal molecules contained between glass substrates, coupling the uniaxial compensation film to at least one of the glass substrates, and coupling a polarization film and electrodes to the compensation film. Preferably, the uniaxial compensation film has a thickness less than or equal to 50 microns. Where there are multiple compensation films, the total thickness and the total retardation values should be considered.

Claims

1. A method of building a display device, the method comprising:

providing a liquid crystal panel including liquid crystal molecules contained between glass substrates, wherein long axes of the liquid crystal molecules are oriented orthogonal to the glass substrates in absence of electrical field;

coupling a set of compensation films to at least one of the glass substrates, wherein the set of compensation films includes one or more uniaxial compensation films and provides a total retardation value less than or equal to 200 nm for light having a wavelength of about 550 nm;

coupling a polarization film to the set of compensation films; and

coupling electrodes to the liquid crystal panel.

2-23. -23. (canceled)