Optical element, method of manufacturing optical element, and liquid crystal display device

  • US 10,605,971 B2
  • Filed: 02/12/2018
  • Issued: 03/31/2020
  • Est. Priority Date: 08/27/2015
  • Status: Active Grant
First Claim
Patent Images

1. An optical element comprising:

  • a reflection polarizer which is formed of a discotic liquid crystal compound and in which a cholesteric liquid crystalline phase is immobilized,wherein, in the reflection polarizer, a front retardation value Re satisfies 0 nm≤

    Re≤

    10 nm in a range of ±

    50 nm outside a reflection center wavelength, and an absolute value |Ret (50°

    )| of a retardation value Ret in a polar angle 50°

    direction satisfies |Ret (50°

    )|≤

    50 nm,wherein the reflection polarizer includes a first light reflecting layer, a second light reflecting layer, and a third light reflecting layer, andwherein, any one of the first light reflecting layer, the second light reflecting layer, and the third light reflecting layer is a blue reflection layer having a reflection center wavelength of 380 to 499 nm and having a peak of a reflectance of which a half-width is 100 nm or less, another is a green reflection layer having a reflection center wavelength of 500 to 599 nm and having a peak of a reflectance of which a half-width is 200 nm or less, and another is a red reflection layer having a reflection center wavelength of 600 to 750 nm and having a peak of a reflectance of which a half-width is 150 nm or less.

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