Optical element and display device

The optical element with a transverse electric field and positive dielectric anisotropy liquid crystals addresses the viscosity and viewing angle issues of existing technologies, enabling fast switching and wide viewing angles without additional films.

JP7763149B2Active Publication Date: 2025-10-31JAPAN DISPLAY INC
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Patent Information

Application Number
JP2022086302
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-05-26
Publication Date
2025-10-31
Estimated Expiration
2042-05-26

AI Technical Summary

Technical Problem

Liquid crystal layers with liquid crystal molecules having negative dielectric anisotropy exhibit higher viscosity, leading to slower response speed and the need for additional viewing angle compensation films, while those with positive dielectric anisotropy result in lower viewing angles, necessitating a simpler configuration for effective viewing angle control.

Method used

An optical element comprising a first and second polarizer with a first viewing angle control panel between them, utilizing liquid crystal molecules with positive dielectric anisotropy, and electrodes generating a transverse electric field for hybrid orientation, allowing for switching between narrow and wide viewing angles without additional compensation films.

Benefits of technology

The solution provides efficient viewing angle control with faster response times and wider viewing angles, eliminating the need for additional films like C-plates, while maintaining high brightness and image quality.

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Abstract

To provide an optical element and a display device in which a viewing angle can be controlled suitably with a simple structure.SOLUTION: An optical element includes a first polarization plate with a first absorption axis, a second polarization plate facing the first polarization plate and having a second absorption axis, and a first viewing angle control panel disposed between the first polarization plate and the second polarization plate. The first viewing angle control panel includes a first substrate, a second substrate facing the first substrate, a liquid crystal layer provided between the first substrate and the second substrate, and a plurality of electrodes provided on at least one of the first substrate and the second substrate and generating a lateral electric field in a predetermined direction. The liquid crystal layer includes a liquid crystal molecule whose dielectric anisotropy is positive, and the liquid crystal molecule is subjected to hybrid alignment in a state where the lateral electric field is not generated.SELECTED DRAWING: Figure 3
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