Storage Electrode Segmentation for LCD Repair

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Solution Overview

Problem

In liquid crystal displays, repairing disconnections or shorts in data lines and pixel electrodes can cause luminance distortions in adjacent pixels due to the influence of storage electrodes, leading to unstable repair processes.

Innovation Solution

A thin film transistor array panel design incorporating a storage electrode with overlapping and branching configurations, allowing for targeted laser irradiation to reconnect or disconnect data lines and pixel electrodes, minimizing the impact on adjacent pixels by controlling the storage capacitance ratios.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of repair

If a storage electrode is used for repairing pixel deterioration, then the repair process can be executed, but the storage electrode causes potential distortion and luminance changes in adjacent pixels

Engineering Contradiction:

Improverepair process executionVSAvoidpotential distortion in adjacent pixels

Core Design Contradiction:

Ease of repairVSObject-affected harmful factors

Solution Approach 1:

The storage electrode is divided into a first portion overlapping the data line and a second portion enclosing the pixel area edge. This segmentation allows selective connection/disconnection of portions during repair, enabling targeted repair while isolating adjacent pixels from harmful potential distortion effects.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the storage electrode are given different functions: the first portion is used for repairing data line disconnections by overlapping the data line, while the second portion is used for repairing pixel electrode shorts by enclosing the pixel area edge. This local differentiation minimizes impact on adjacent pixels during specific repair operations.

Inventive Principle:

Principle #3Local quality

2Ease of repair

If the storage electrode is connected to the data line for repair, then data line disconnection can be repaired, but adjacent pixels experience luminance distortion

Engineering Contradiction:

Improvedata line disconnection repairVSAvoidluminance of adjacent pixels

Core Design Contradiction:

Ease of repairVSIllumination intensity

Solution Approach 1:

The harmful effect on adjacent pixels is extracted and isolated by using only the first portion of the storage electrode for data line repair. The second portion remains disconnected from the data line, preventing potential distortion from spreading to adjacent pixels while still enabling effective repair of the data line disconnection.

Inventive Principle:

Principle #2Taking out (Extraction)

3Ease of repair

If the storage electrode encloses the pixel area for repair, then pixel electrode short can be repaired, but adjacent pixels are affected by the storage electrode influence

Engineering Contradiction:

Improvepixel electrode short repairVSAvoideffect on adjacent pixel electrode

Core Design Contradiction:

Ease of repairVSObject-affected harmful factors

Solution Approach 1:

The storage electrode is segmented into two portions with distinct functions. The second portion encloses the pixel area edge for repairing pixel electrode shorts, while the first portion overlaps the data line. This segmentation ensures that when repairing pixel electrode shorts, only the second portion is activated, minimizing influence on adjacent pixels.

Inventive Principle:

Principle #1Segmentation

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 distortion of potential charged to adjacent pixel electrodes during repair, enabling stable and efficient repair processes with minimal impact on neighboring pixels, achieving a significant reduction in luminance effects.

Implementation Method 1

irradiating a laser on at least one side of the disconnected portion of the data line to short the data line and a storage electrode

Methodology Applied

Scientific EffectLaser melting: Laser Ablation

Implementation Method 2

irradiating the laser to separate a portion shorted to the data line among the storage electrode to be disconnected

Methodology Applied

Scientific EffectLaser ablation: Laser Ablation

Data Source

PatentUS10209588B2Thin film transistor array panel, liquid crystal display, and method to repair the same

Publication Date: 2019.02.19 SAMSUNG DISPLAY CO LTD

AI summary

A method of repairing a short of a pixel electrode and a storage electrode including irradiating laser to separate a portion shorted to the pixel electrode among the storage electrode to be disconnected, in which the storage electrode includes a first portion overlapping a data line between two adjacent gate lines and a second portion connected to the first portion and enclosing an edge of a pixel area except for a region where the first portion is formed, the pixel area is defined by the data line and a gate line, a thin film transistor is coupled to the data line, the gate line, and the pixel electrode, and two adjacent pixel areas are defined by the two adjacent gate lines and two adjacent data lines, and the storage electrode is branched between pixel electrodes respectively formed in the two adjacent pixel areas.