Liquid Crystal Display Electrode Structure for Uniform Electric Fields

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Solution Overview

Problem

In vertical alignment mode liquid crystal displays, the orientation of liquid crystal molecules is affected by uneven electrode structures, leading to non-uniform electric fields and image quality deterioration due to level disconnections and light transmissivity issues.

Innovation Solution

A liquid crystal display structure featuring a first electrode with projecting and recessed portions, where transparent conductive material layers are connected on the projecting and recessed surfaces, ensuring uniform electric field application and preventing image quality deterioration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a fine slit structure is used on the pixel electrode to control liquid crystal molecule orientation, then viewing angle is improved, but light transmissivity deteriorates due to portions not applied with electric field and twisted orientation near edges

Engineering Contradiction:

Improveviewing angleVSAvoidlight transmissivity

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The pixel electrode is divided into multiple regions with different electrode patterns (first electrode pattern and second electrode pattern) to create different electric field distributions. This segmentation allows control of liquid crystal molecule orientation in different domains while maintaining continuous electric field application to prevent twisted structures and improve light transmissivity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the pixel electrode are designed with different local characteristics - some regions have first electrode patterns while others have second electrode patterns. This local differentiation enables tailored electric field distributions that optimize both viewing angle and light transmissivity in different areas of the pixel.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If an uneven portion structure is formed on the electrode to control liquid crystal orientation, then viewing angle is improved, but level disconnection occurs causing non-uniform electric field and image quality deterioration

Engineering Contradiction:

Improveviewing angleVSAvoidelectric field uniformity

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

A transparent resin layer is introduced as an intermediary between the uneven electrode structure and the liquid crystal layer. This resin layer fills the recessed portions and covers the projecting portions, creating a uniform surface that ensures even electric field distribution while preserving the underlying uneven structure's ability to control liquid crystal orientation for improved viewing angle.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If vertical alignment mode is used to achieve wider viewing angle, then viewing angle is improved, but response characteristics deteriorate due to arbitrary falling direction of liquid crystal molecules under voltage

Engineering Contradiction:

Improveviewing angleVSAvoidresponse characteristics

Core Design Contradiction:

Adaptability or versatilityVSSpeed

Solution Approach 1:

The electrode structure is designed to dynamically control the orientation state of liquid crystal molecules based on applied voltage. The multi-region electrode pattern creates electric fields that guide molecules from their initial vertical orientation to a controlled parallel orientation, improving response characteristics while maintaining the wide viewing angle advantage of vertical alignment mode.

Inventive Principle:

Principle #15Dynamics

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 structure ensures uniform electric field distribution, improving image quality and reducing the risk of disconnection, thereby enhancing the display's optical characteristics and response characteristics.

Implementation Method 1

In the VA mode, the liquid crystal molecule has a property in which the negative dielectric constant anisotropy, namely, the dielectric constant in the long axis direction of the liquid crystal molecule is smaller compared to that in the short axis direction

Methodology Applied

Scientific EffectNegative dielectric constant anisotropy: Dielectric Permittivity

Implementation Method 2

transparent conductive material layers are connected on the projecting and recessed surfaces, ensuring uniform electric field application

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 3

a pretilt angle is provided to a liquid crystal molecule

Methodology Applied

Scientific EffectMolecular alignment:

Data Source

PatentUS12386225B2Liquid crystal display

Publication Date: 2025.08.12 SATURN LICENSING LLC

AI summary

A liquid crystal display is formed by arraying a plurality of pixels 10, and the pixel 10 includes a first substrate 20, a second substrate 50, a first electrode 120 formed on the first substrate 20, a second electrode 52 formed on the second substrate 50, and a liquid crystal layer 60. A pretilt angle is provided to a liquid crystal molecule 61, and the first electrode 120 is formed of a transparent conductive material layer and a foundation layer 150 including a plurality of projecting portions 130 and recessed portions 140. A first transparent conductive material layer 135 connected to a first power feeding unit is formed on a projecting portion top surface 151 of the foundation layer 150, and a second transparent conductive material layer 145 connected to a second power feeding unit is formed on a recessed portion bottom surface 152 of the foundation layer 150.