LCD Pixel Electrode Branch Layout for Trace Mura Suppression

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Solution Overview

Problem

LCD panels face issues with Trace Mura, where external forces cause liquid-crystal molecules to deflect irregularly, leading to poor display quality and reduced transmittance and contrast.

Innovation Solution

A pixel structure is introduced with a second electrode featuring electrode branches arranged in a specific pattern, including slits and end portions that eliminate inner corners, enhancing the transmittance and contrast of the display panel while improving the Trace Mura problem.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional electrode structures are used, then manufacturing is simpler, but Trace Mura occurs and display quality deteriorates

Engineering Contradiction:

Improvedisplay qualityVSAvoidelectrode structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The second electrode is divided into multiple electrode branches arranged in a specific pattern, where each branch includes body segments and end portions with slits. This segmentation eliminates inner corners that cause liquid crystal alignment issues, thereby resolving Trace Mura while maintaining manageable structural complexity through systematic arrangement.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The electrode structure implements local quality by differentiating between body portions and end portions, with slits specifically positioned at end portions. This localized modification targets the specific areas causing Trace Mura (inner corners) without unnecessarily complicating the entire electrode structure, improving display quality where needed while keeping overall complexity controlled.

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If electrode branches with inner corners are used, then manufacturing is easier, but transmittance and contrast are reduced

Engineering Contradiction:

Improveelectrode fabricationVSAvoidtransmittance and contrast

Core Design Contradiction:

Ease of manufactureVSIllumination intensity

Solution Approach 1:

The invention extracts and removes the problematic inner corner portions from the electrode structure by introducing slits at the end portions. This extraction eliminates the geometric features that cause liquid crystal alignment distortion, thereby improving transmittance and contrast while the remaining structure remains manufacturable through standard photolithography processes.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The electrode branch end portions are designed with curved or rounded features instead of sharp inner corners. This curvature modification eliminates the alignment disruption caused by sharp corners, improving optical performance while the curved geometry remains compatible with conventional electrode fabrication methods.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Adaptability or versatility

If external forces are applied to the display panel, then touch interaction is enabled, but liquid crystal molecules deflect irregularly causing Trace Mura

Engineering Contradiction:

Improvetouch functionalityVSAvoiddisplay uniformity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The electrode structure is pre-designed with slits at end portions to counteract the harmful effects of external touch forces. By eliminating inner corners beforehand, the structure prevents the irregular liquid crystal deflection that would otherwise be caused by mechanical stress during touch interaction, maintaining display uniformity while preserving touch functionality.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The slit structure acts as a cushioning design element that anticipates and mitigates the impact of external forces. The modified geometry reduces stress concentration and prevents cascade failures in liquid crystal alignment, thereby protecting against Trace Mura before it occurs during touch operations.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 proposed pixel structure effectively improves the transmittance and contrast of LCD panels, while reliably addressing the Trace Mura issue, resulting in better display quality.

Implementation Method 1

The liquid-crystal molecules in the liquid-crystal layer can be deflected by the electric field formed by the first electrode and the second electrode

Methodology Applied

Scientific EffectElectric field: Electric Field

Data Source

PatentUS12216366B2Pixel structure, display panel and display device

Publication Date: 2025.02.04 HEFEI BOE OPTOELECTRONIC TECH CO LTD

AI summary

Provided is a pixel structure. The pixel structure includes: a first electrode, a second electrode, and a liquid crystal layer that are disposed on one side of a substrate and successively stacked, wherein one of the first electrode and the second electrode is a pixel electrode and the other of the first electrode and the second electrode is a common electrode, and the second electrode includes a plurality of electrode branches sequentially arranged in a first direction, wherein each of the electrode branches includes a first end portion, a body portion, and a second end portion that are successively connected in a second direction, the body portion including at least one body segment.