Shading Electrodes Prevent Light Leakage in LCD Panels

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In liquid crystal display panels, abnormal deflection of liquid crystals near gate electrodes due to electric fields causes light leakage, especially when the panel is pressed or squeezed, leading to reduced image quality due to the inability of the black matrix to cover offset areas.

Innovation Solution

The liquid crystal display panel incorporates shading electrodes and transparent electrodes, electrically connected and disposed in the same layer, which cover the spacing areas between common electrode lines and gate electrodes, ensuring they have the same potential and preventing abnormal deflection of liquid crystals, thereby addressing light leakage issues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a black matrix is used to shield opaque areas, then light leakage prevention is improved, but image quality deteriorates when the panel is pressed or squeezed due to substrate offset

Engineering Contradiction:

Improvelight leakage preventionVSAvoidimage quality stability under pressure

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The pixel electrode layer is segmented into transparent electrodes and shading electrodes, with the shading electrodes specifically positioned to cover spacing areas between common electrode lines and gate electrodes. This segmentation allows targeted light leakage prevention in critical areas without requiring a complete black matrix coverage, maintaining image quality even when substrates offset under pressure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The shading electrodes are preliminarily positioned in the spacing areas between common electrode lines and gate electrodes before any potential substrate offset occurs. This preliminary placement ensures that when the panel is pressed or squeezed and substrates offset, the shading electrodes are already in position to cover the resulting abnormal alignment areas and prevent light leakage.

Inventive Principle:

Principle #10Preliminary action

2Object-affected harmful factors

If the black matrix is positioned to cover spacing areas, then light leakage is reduced, but manufacturing complexity increases due to alignment requirements

Engineering Contradiction:

Improvelight leakage from spacing areasVSAvoidalignment complexity between substrates

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The shading electrodes are merged with the transparent electrodes in the same pixel electrode layer, both being formed through the same ITO coating and patterning process. This merging eliminates the need for separate black matrix alignment between substrates, as the shading electrodes are already positioned on the array substrate to cover the spacing areas, simplifying manufacturing while preventing light leakage.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shading electrodes act as an intermediary element between the common electrode lines and gate electrodes, covering the spacing areas and preventing light leakage without requiring direct alignment between the array substrate and color filter substrate black matrices. This intermediary approach simplifies the overall alignment requirements.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If shading electrodes are added to cover spacing areas, then light leakage prevention is improved, but device complexity increases

Engineering Contradiction:

Improvelight leakage in spacing areasVSAvoidelectrode structure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The shading electrodes and transparent electrodes are merged into the same pixel electrode layer, both formed through identical ITO coating and patterning processes. This merging means that while shading electrodes are added to cover spacing areas, the manufacturing process complexity does not significantly increase, as no additional material deposition or patterning steps are required.

Inventive Principle:

Principle #5Merging (Combining)

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

This configuration effectively prevents light leakage by maintaining the dark and opaque state of liquid crystals in offset areas, improving the image quality of the display panel and reducing the likelihood of abnormal deflection.

Implementation Method 1

Due to influence of electric fields near gate electrodes, liquid crystals near the gate electrodes will be abnormally deflected

Methodology Applied

Scientific EffectElectric Field: Electric Field

Implementation Method 2

a black matrix is generally used to shield opaque areas to prevent pixels from leaking light

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS11378853B2Liquid crystal display panel and display device

Publication Date: 2022.07.05 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

A liquid crystal display panel and a display device are provided. The liquid crystal display panel includes an array substrate and a color filter substrate disposed oppositely, and liquid crystals. The array substrate includes common electrode lines, gate electrodes, and a transparent electrode layer. In a direction parallel to a plane where the array substrate is located, spacing areas are provided between the common electrode lines and the gate electrodes; the transparent electrode layer includes shading electrodes and pixel electrodes, the shading electrodes and the pixel electrodes are electrically connected, and the shading electrodes cover the spacing areas.