Peripheral Electrode Potential Control for Ionic Impurity Retention
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Solution Overview
Problem
Existing liquid crystal devices face challenges in preventing deterioration of display quality due to ionic impurities, as previous techniques fail to reliably draw and retain these impurities away from the pixel region, leading to issues like image burning or staining.
Innovation Solution
A liquid crystal device is designed with a first peripheral electrode on the first substrate, which applies a constant potential different from the common potential, creating an electric field to draw and retain ionic impurities in the peripheral region, thereby preventing their aggregation in the pixel area. This configuration eliminates the need for a peripheral electrode on the second substrate and simplifies the power feeding, using a constant potential to maintain effective impurity retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same electric potential is applied to the dummy wiring electrode and the common electrode, then the configuration is simple, but an electric field cannot be formed and ionic impurities cannot be sufficiently drawn in
Solution Approach 1:
The patent changes the electric potential parameter of the peripheral electrode from being the same as the common electrode to being different from the common electrode. This parameter change enables the formation of an electric field between the peripheral electrode and the common electrode, which effectively draws in ionic impurities to the peripheral region, thereby resolving the contradiction between simple configuration and effective impurity prevention.
2Ease of operation
If the polarity of the peripheral electrode changes, then ionic impurities move toward the peripheral electrode when positive, but move away when negative, making it impossible to reliably retain impurities
Solution Approach 1:
The patent applies a constant electric potential to the peripheral electrode that is different from the common electrode potential. This creates a stable electric field that continuously draws ionic impurities toward the peripheral electrode and retains them there. The constant potential difference ensures that impurities are reliably prevented from aggregating in the pixel region, resolving the contradiction between operational flexibility and retention reliability.
3Device complexity
If a peripheral electrode is provided only on the first substrate side, then the configuration is simpler without inter-substrate conduction, but the ability to draw and retain ionic impurities is insufficient
Solution Approach 1:
The patent segments the electrode structure by providing a peripheral electrode only on the first substrate side, separate from the common electrode on the second substrate side. This segmentation simplifies the overall configuration by eliminating the need for inter-substrate conduction while maintaining effective ionic impurity prevention through the electric field formed between the separated electrodes.
Solution Approach 2:
The patent changes the electric potential parameter of the peripheral electrode to be different from the common electrode potential. This parameter change enables the formation of an electric field that effectively draws and retains ionic impurities in the peripheral region, compensating for the simplified single-substrate electrode configuration and ensuring reliable impurity prevention.
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 prevents deterioration of display quality by efficiently drawing and retaining ionic impurities in the peripheral region, ensuring that they do not exude into the pixel area, thus maintaining image quality without requiring inter-substrate conduction or complex circuit configurations.
Implementation Method 1
a first peripheral electrode which is provided at a peripheral region sandwiched between the pixel region and the seal material at one face side of the first substrate and to which a constant potential different from the common potential is applied
Implementation Method 2
ionic impurities are drawn to the peripheral electrode
Implementation Method 3
an electric field in the layer thickness direction of the liquid crystal layer is generated between the first peripheral electrode and the common electrode
Data Source
AI summary
A first peripheral electrode and a second peripheral electrode are provided at a peripheral region sandwiched between a pixel region and a seal material in a first substrate of a liquid crystal device, and strength of electric potentials which are applied to the first peripheral electrode, the second peripheral electrode, and a common electrode of an opposite substrate satisfies the condition of the second peripheral electrode<the common electrode<the first peripheral electrode. Therefore, electric fields are formed between the first peripheral electrode and the common electrode, between the second peripheral electrode and the common electrode, and between the first peripheral electrode and the second peripheral electrode.