Asymmetric Electrode Layout for LCD Image Unevenness

Solution Overview

Problem

Liquid crystal display devices with built-in touch sensors experience image unevenness when common metal electrodes are used to decrease resistance, leading to asymmetric electric potential distribution and ion unevenness, particularly in the corners of the display screen.

Innovation Solution

The implementation of an asymmetry improving electrode on the counter substrate, positioned to overlap the black matrix and satisfy specific width and spacing conditions relative to the common metal electrode, aims to enhance the symmetry of electric potential distribution and reduce display unevenness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a common metal electrode is provided to decrease the resistance of the common electrode, then the resistance of the common electrode is reduced, but image unevenness occurs in the corner of the display screen

Engineering Contradiction:

Improveelectrical conductivityVSAvoidimage quality

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies asymmetry by introducing a second metal electrode on the counter substrate that is positioned asymmetrically relative to the first metal electrode on the array substrate. This asymmetric configuration specifically targets and compensates for the image unevenness that occurs in corner regions, allowing the common metal electrodes to maintain low resistance while the asymmetric second metal electrode corrects the resulting display non-uniformity

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The second metal electrode acts as a counterweight to the first metal electrode in terms of electrical influence. By positioning the second metal electrode to overlap the black matrix and specific sub pixel regions, it creates a compensating electrical effect that counterbalances the image unevenness caused by the first metal electrode, thereby maintaining both low resistance and high image quality

Inventive Principle:

Principle #8Anti-weight (Counterweight)

2Reliability

If a common metal electrode is provided to decrease the resistance of the common electrode, then the resistance of the common electrode is reduced, but display unevenness occurs

Engineering Contradiction:

Improveelectrical conductivityVSAvoiddisplay uniformity

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent applies asymmetry by introducing a second metal electrode on the counter substrate that is positioned asymmetrically relative to the first metal electrode on the array substrate. This asymmetric configuration specifically targets and compensates for the image unevenness that occurs in corner regions, allowing the common metal electrodes to maintain low resistance while the asymmetric second metal electrode corrects the resulting display non-uniformity

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent works to achieve equipotentiality by strategically positioning the second metal electrode to create balanced electrical potential distribution across the display. The electrode is configured to overlap specific regions (black matrix and sub pixels) to equalize the electrical potential and eliminate potential differences that cause display unevenness, thereby maintaining stable and uniform display composition

Inventive Principle:

Principle #12Equipotentiality

3Reliability

If the first metal electrode is disposed to overlap the black matrix, then the resistance is decreased, but asymmetric electric potential distribution occurs

Engineering Contradiction:

Improveelectrical conductivityVSAvoidelectric potential distribution

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The second metal electrode acts as a counterweight to the first metal electrode in terms of electrical influence. By positioning the second metal electrode to overlap the black matrix and specific sub pixel regions, it creates a compensating electrical effect that counterbalances the image unevenness caused by the first metal electrode, thereby maintaining both low resistance and high image quality

Inventive Principle:

Principle #8Anti-weight (Counterweight)

Solution Approach 2:

The patent works to achieve equipotentiality by strategically positioning the second metal electrode to create balanced electrical potential distribution across the display. The electrode is configured to overlap specific regions (black matrix and sub pixels) to equalize the electrical potential and eliminate potential differences that cause display unevenness, thereby maintaining stable and uniform display composition

Inventive Principle:

Principle #12Equipotentiality

Data Source

PatentUS10108041B2Liquid crystal display device

Publication Date: 2018.10.23 MAGNOLIA WHITE CORP

AI summary

There is provided a liquid crystal display device that a high quality image with suppressed display unevenness can be obtained. A liquid crystal display device includes a first metal electrode, a black matrix disposed at regular spacings, and a liquid crystal. The first metal electrode is disposed to overlap the black matrix when seen perpendicularly from above, and a second metal electrode is disposed at a place at which the first metal is not disposed at a position at which the second metal electrode overlaps the black matrix between different color sub pixels.