MVA-LCD Domain Division Electrodes for Viewing Angle and Response Time

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Solution Overview

Problem

Conventional MVA-LCD panels face issues with color shift and color washout due to viewing angle changes, and have longer response times and light leakage, which affect their performance in terms of contrast ratio, luminance, and viewing angle.

Innovation Solution

The implementation of first and second domain division electrodes (DDEs) and a dielectric layer in the MVA-LCD panel, along with a driving method that applies control and common electrode voltages to pre-tilt liquid crystal molecules, reduces response time and eliminates color shift and washout by providing multiple effective voltages to the liquid crystal layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If alignment protrusions are used to achieve wide viewing angle, then viewing angle is improved, but light leakage occurs

Engineering Contradiction:

Improveviewing angleVSAvoidlight leakage

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent removes the alignment protrusions from the color filter substrate and replaces them with domain division electrodes formed on the TFT array substrate. This extraction of the problematic structure eliminates light leakage while preserving the wide viewing angle function through the electrode-based domain division mechanism.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical alignment protrusions with electrical domain division electrodes. Instead of using physical protrusions to control liquid crystal orientation, the invention uses voltage-controlled electrodes to create multiple domains, achieving the same functional result without the harmful light leakage effect.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If slits are used to achieve wide viewing angle, then viewing angle is improved, but response time increases

Engineering Contradiction:

Improveviewing angleVSAvoidresponse time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent replaces the slit structure with domain division electrodes that apply electric fields to control liquid crystal orientation. This electrical control mechanism enables faster response time compared to the mechanical slit approach, while maintaining wide viewing angle capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If conventional MVA structure is used to achieve wide viewing angle, then viewing angle is improved, but color shift and color washout occur

Engineering Contradiction:

Improveviewing angleVSAvoidcolor consistency

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent applies different voltage levels to different domain division electrodes (first DDE and second DDE), creating locally optimized electric field distributions. This local quality control enables precise control of liquid crystal orientation in each domain, preventing color shift and color washout while maintaining wide viewing angle.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the voltage parameters applied to the domain division electrodes to control the tilt angle and orientation of liquid crystal molecules in different domains. By adjusting these electrical parameters, the invention achieves uniform color characteristics across different viewing angles without the color shift problems of conventional structures.

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 shortens response time, prevents light leakage, and enhances displaying quality by pre-tilting liquid crystals and applying multiple voltages to the liquid crystal layer, thereby improving contrast ratio and maintaining luminance across different viewing angles.

Implementation Method 1

inputting a control voltage to a DDE to pre-tilt the liquid crystal molecules of the liquid crystal layer

Methodology Applied

Scientific EffectLiquid crystal orientation control: Liquid Crystals

Implementation Method 2

a liquid crystal layer disposed between the active component array substrate and the opposite substrate

Methodology Applied

Scientific EffectLiquid crystal switching: Liquid Crystals

Data Source

PatentUS7605896B2Multi-domain vertical alignment liquid crystal display having control electrodes and driving method thereof

Publication Date: 2009.10.20 AU OPTRONICS CORP

AI summary

An MVA-LCD panel, including an active component array substrate, an opposite substrate and a liquid crystal layer disposed between is provided. The active component array substrate includes scan lines, data lines, control lines and pixel units. Each of the pixel units includes an active component, a domain division electrode (DDE) and a pixel electrode. The active component is electrically connected with the corresponding scan line and the corresponding data line, the DDE being electrically connected with the corresponding control line, the pixel electrode being electrically connected with the active component. The pixel electrode has first slits, and the first DDE are disposed under the first slits. The opposite substrate has a common electrode layer facing toward the active component array substrate. The common electrode layer includes second slits and at least a part of the second slits is disposed over the first domain division electrode.