Liquid Crystal Grating Electric Field Alignment

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Solution Overview

Problem

Existing stereoscopic display devices face challenges in improving display effects due to the adverse impact of transverse electric fields on liquid crystal molecule rotation and the occurrence of antiphase domains.

Innovation Solution

A liquid crystal grating is designed with a specific configuration where the electric field direction is aligned with the alignment direction of the alignment layer, reducing the impact of transverse electric fields and alleviating antiphase domains.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a liquid crystal grating is used in stereoscopic display devices, then the display effect is improved, but the transverse electric field adversely affects liquid crystal molecule rotation and causes antiphase domains

Engineering Contradiction:

Improvedisplay effectVSAvoidtransverse electric field impact

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the electrical parameters by adjusting the voltage distribution across the liquid crystal layer. By applying different voltages to different regions of the liquid crystal grating, the electric field direction is controlled to align with the alignment layer, preventing the harmful transverse electric field effect while maintaining the desired liquid crystal molecule orientation for stereoscopic display

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent inverts the conventional approach by making the electric field direction consistent with the alignment layer direction rather than opposite to it. This inversion of the electric field orientation eliminates the adverse impact on liquid crystal molecule rotation and prevents antiphase domain formation, while still achieving the light diffraction function necessary for stereoscopic display

Inventive Principle:

Principle #13The other way round (Inversion)

2Stability of the object's composition

If the electric field direction is opposite to the alignment layer direction, then liquid crystal molecules can rotate, but antiphase domains occur due to transverse electric field impact

Engineering Contradiction:

Improveliquid crystal molecule rotationVSAvoidantiphase domains

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent modifies the electrical parameter configuration by adjusting voltage distribution to ensure the electric field direction aligns with the alignment layer. This parameter change enables liquid crystal molecule rotation while eliminating the transverse electric field component that causes antiphase domains, achieving stable and reliable display performance

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution effectively reduces the adverse effects of transverse electric fields on liquid crystal molecule rotation, thereby improving the display effect and minimizing antiphase domains in stereoscopic display devices.

Implementation Method 1

a liquid crystal layer (30) disposed between the first electrodes (21) and the second electrode (22)

Methodology Applied

Scientific EffectLiquid crystal phase modulation: Liquid Crystals

Implementation Method 2

The holographic three-dimensional display technology utilizes the diffraction or interference of light to record the amplitude and phase information of object light

Methodology Applied

Scientific EffectLight diffraction: Diffraction

Implementation Method 3

an alignment direction of the first alignment layer (31) is the same as an electric field direction of a first electric field (TE1)

Methodology Applied

Scientific EffectAlignment layer orientation:

Data Source

PatentUS12339537B2Liquid crystal grating and stereoscopic display device

Publication Date: 2025.06.24 SHANGHAI TIANMA MICRO ELECTRONICS CO LTD

AI summary

Provided are a liquid crystal grating and a stereoscopic display device. The liquid crystal grating includes at least one liquid crystal cell. A liquid crystal cell includes a first substrate, first electrodes, a first alignment layer, a liquid crystal layer and a second substrate which are disposed sequentially. In a first state, the liquid crystal cell includes multiple first grating units which are arranged along a first direction, and a first grating unit includes multiple first electrodes which are disposed at intervals from each other along the first direction. Along the first direction, a first electric field is formed between two closest first electrodes which are located in two adjacent first grating units, respectively, and in the liquid crystal cell, an alignment direction of the first alignment layer is the same as an electric field direction of the first electric field.