US 10,001,674 B2 · Brightness enhancement film, optical sheet member, and liquid crystal display device

Abstract

Provided are a brightness enhancement film including a λ/4 plate, and a reflection polarizer, in which the reflection polarizer includes at least two light reflection layers formed by immobilizing a cholesteric liquid crystalline phase, one light reflection layer of the reflection layers is a layer formed of a polymerizable liquid crystal composition containing a rod-like liquid crystal compound, and the other light reflection layer is a layer formed of a polymerizable liquid crystal composition containing a disk-like liquid crystal compound, and an optical sheet member including the brightness enhancement film, and a liquid crystal display device including the optical sheet member. The brightness enhancement film of the present invention has high brightness and is able to suppress an oblique change in the shade at the time of being incorporated in a liquid crystal display device.

Claims20

Dependent claims

A brightness enhancement film, comprising:

a λ/4 plate;
and
a reflection polarizer,
wherein the reflection polarizer includes a first light reflection layer and a second light reflection layer in this order from the λ/4 plate side,
both of the first light reflection layer and the second light reflection layer are light reflection layers formed by immobilizing a cholesteric liquid crystalline phase, and
one light reflection layer of the first light reflection layer and the second light reflection layer is a layer formed of a polymerizable liquid crystal composition containing a rod-like liquid crystal compound, and the other light reflection layer is formed of a polymerizable liquid crystal composition containing a disk-like liquid crystal compound.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/231,057Filed 8 Aug 2016 · continuation

Priority

JP 2014-02661614 Feb 2014

Published

US 2016/0342003 A124 Nov 2016

Granted

19 Jun 2018

Term ends

Not estimatedThe source records don’t support an estimate.

Classification42 codes

G02F 1/13363
Structural association of cells with optical devices, e.g. polarisers or reflectors: birefringent elements, e.g. for optical compensation
B29D 11/00644
Production of filters: polarizing
B29D 11/00788
Production of other optical elements not provided for in B29D11/00009- B29D11/0073: producing optical films
C09K 19/18
Linked by a carbon chain: the chain containing carbon-to-carbon triple bonds, e.g. tolans

Brightness enhancement film, optical sheet member, and liquid crystal display device

Life of this patent

Brightness enhancement film, optical sheet member, and liquid crystal display device

Life of this patent

Abstract

Claims20