Liquid Crystal Display Ion Trapping Electrode Structure
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Solution Overview
Problem
In liquid crystal display devices, ions from impurities or sealing members can accumulate in the liquid crystal layer, leading to reduced effective voltage and display quality issues such as black non-uniformity, which existing ion-trapping technologies have not adequately addressed.
Innovation Solution
A liquid crystal display device configuration with a first substrate, a second substrate, and a sealing member, where at least part of the first electrode is made of a metal material with light-shielding properties, positioned closer to the liquid crystal layer than scanning and signal lines, and a second electrode with a higher voltage than the first electrode is used to create an electric field that traps ions in the peripheral area, preventing them from entering the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrode is disposed in a peripheral area outside the display area to trap ions, then display quality and reliability are improved, but device complexity increases
Solution Approach 1:
The patent combines the ion-trapping electrode with the existing scanning line and signal line structures. The first electrode is formed as part of the scanning line structure, and the second electrode is formed as part of the signal line structure, merging multiple functions into existing components to avoid adding separate ion-trapping electrodes that would increase device complexity
Solution Approach 2:
The scanning lines and signal lines serve dual purposes: they function as electrical connection lines for driving the liquid crystal display pixels, and simultaneously function as ion-trapping electrodes. This multi-functionality eliminates the need for dedicated ion-trapping electrodes, resolving the contradiction between improving reliability and reducing device complexity
2Reliability
If the first electrode is made of metal material with light-shielding properties, then ion trapping effectiveness is improved, but light transmission to display area may be reduced
Solution Approach 1:
The patent applies different material properties to different parts of the electrode structure. The first electrode uses metal material with light-shielding properties for effective ion trapping, while the second electrode uses transparent conductive material to maintain light transmission. This local differentiation of material properties allows the structure to simultaneously achieve ion trapping effectiveness and light transmission
Solution Approach 2:
The patent employs composite material strategies by combining metal materials with light-shielding properties in the first electrode while using transparent conductive materials in the second electrode. This composite approach allows the electrode structure to fulfill both ion trapping and light transmission requirements through material selection
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 ion-induced degradation in display quality and enhances the reliability of the liquid crystal display device by trapping ions in the peripheral area, thereby maintaining consistent display performance.
Implementation Method 1
A first voltage is applied to the first electrode, and a second voltage larger than the first voltage is applied to the second electrode. Ions existing in the liquid crystal layer are trapped by an electric field formed between the first electrode and the second electrode.
Implementation Method 2
Ions existing in the liquid crystal layer are trapped by an electric field formed between the first electrode and the second electrode.
Data Source
AI summary
According to one embodiment, a liquid crystal display device comprises first and second substrates, a sealing member, and a liquid crystal layer. The first substrate includes an image display area, a peripheral area, a common electrode, a scanning line, a signal line, a switching element, a pixel electrode, and first and second electrodes. At least a part of the first electrode is formed of a metal material and is closer to the liquid crystal layer than the scanning and signal lines. The first voltage is applied to the first electrode and the second voltage is applied to the second electrode. Ions in the liquid crystal layer are trapped by an electric field formed between the first and second electrodes.