Liquid crystal display apparatus having excellent viewing angle compensation

• US 9,465,253 B2
• Filed: 06/19/2006
• Issued: 10/11/2016
• Est. Priority Date: 11/15/2005
• Status: Expired due to Fees

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Kiya, Yoshiyuki
• Primary Examiner(s): Qi, Mike
• Application Number:
  US12/092,486
• Publication Number:
  US 20090153784A1
• Time in Patent Office: 3,767 Days
• Field of Search: 349/117, 349/118, 349/106, 349/158
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133567 on the back side
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 2413/01 Number of plates being 1
• CPC Class Codes: G02F 2413/12 Biaxial compensators

Abstract

A liquid crystal display apparatus of the present invention includes: a liquid crystal cell including a pair of substrates provided with a color filter on one substrate, and a liquid crystal layer as a display medium arranged between the substrates; and an optical compensation element including at least an optical compensation layer. The substrate provided with the color filter has a haze value of more than 10%, and the optical compensation element and the liquid crystal layer are arranged on the same side with respect to the color filter.

Claims

1. A liquid crystal display apparatus comprising:

a liquid crystal cell including a first substrate provided with a color filter, a second substrate, and a liquid crystal layer as a display medium arranged between the first and second substrates; and

an optical compensation layer arranged on the second substrate,

wherein the optical compensation layer has a refractive index profile of nx>

ny>

nz,

wherein the first substrate has a haze value of more than 10% but less than or equal to 25%,

wherein the liquid crystal display apparatus comprises only one optical compensation layer,

wherein the color filter is arranged on a viewer side and the optical compensation layer is arranged on a backlight side,

wherein the liquid crystal cell employs a VA mode, and

wherein an in-plane retardation Δ

nd of the optical compensation layer is 5 nm to 150 nm, and a thickness direction retardation Rth of the optical compensation layer is 10 nm to 300 nm.

2. A liquid crystal display apparatus according to claim 1, wherein the optical compensation layer is formed from a non-liquid crystalline material.

3. A liquid crystal display apparatus according to claim 2, wherein the non-liquid crystalline material comprises at least one polymer selected from the group consisting of polyimide, polyamide, polyester, polyetherketone, polyamideimide, and polyesterimide.

4. A liquid crystal display apparatus according to claim 1, wherein the optical compensation layer has a thickness of 1 to 20 μ

m.

5. A liquid crystal display apparatus according to claim 1, wherein the optical compensation element and the liquid crystal layer are arranged on the same side of the color filter.