Liquid Crystal Device Ionic Impurity Adsorption
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Solution Overview
Problem
Liquid crystal devices suffer from display defects such as display unevenness and burn-in due to the eccentric location of ionic impurities, which are not effectively adsorbed by existing ionic impurity adsorption electrodes, especially when their positional relationship with potential-applied connection lines is not optimally considered.
Innovation Solution
The introduction of a liquid crystal device configuration with a first and second connection line layer on the substrate, where the second connection line layer overlaps with the first connection line layer and applies a potential opposite to the common potential, generating a reversing electric field to disperse ionic impurities within the liquid crystal layer, thereby reducing display defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single ionic impurity adsorption electrode is disposed on the outside of the display area, then ionic impurities can be adsorbed, but ionic impurities may still be eccentrically located and not effectively adsorbed when connection lines are present
Solution Approach 1:
The single adsorption electrode is segmented into a first connection line layer and a second connection line layer with opposite polarities. This segmentation allows each layer to adsorb different types of ionic impurities (positive and negative), thereby improving the overall adsorption effectiveness and preventing eccentric location of impurities near connection lines.
Solution Approach 2:
Different regions of the adsorption electrode structure are assigned different electrical properties. The first connection line layer and second connection line layer have opposite polarities, creating localized electric fields that specifically target and adsorb different types of ionic impurities in different areas, improving local adsorption efficiency.
2Ease of operation
If a potential-applied connection line is disposed closer to the pixel electrode than the ionic impurity adsorption electrode, then connection functionality is maintained, but ionic impurities are eccentrically located and cannot be effectively adsorbed
Solution Approach 1:
Instead of having a single adsorption electrode that might be overshadowed by connection lines, the invention inverts the approach by using multiple layers with opposite polarities. The second connection line layer with opposite polarity to the first layer creates a counterbalancing electric field that prevents impurity eccentricity, thereby maintaining adsorption effectiveness even when connection lines are present.
Solution Approach 2:
The second connection line layer acts as an intermediary between the first connection line layer and the liquid crystal layer. It mediates the electric field distribution to prevent excessive attraction of ionic impurities toward the connection lines, ensuring that impurities remain distributed and accessible for adsorption.
3Reliability
If multiple connection line layers with opposite potentials are introduced, then ionic impurity dispersion is improved, but device structure becomes more complex
Solution Approach 1:
The first and second connection line layers serve multiple functions simultaneously: they provide electrical connection functionality and act as ionic impurity adsorption electrodes. By making the connection lines themselves serve as adsorption electrodes through opposite polarity configuration, the need for separate adsorption electrode structures is eliminated, reducing overall device complexity while maintaining impurity distribution uniformity.
Solution Approach 2:
The invention merges the connection line function with the ionic impurity adsorption function into a single integrated structure. The first and second connection line layers are combined to form a multi-functional component that both conducts electricity and adsorbs ionic impurities, thereby reducing structural complexity compared to having separate connection lines and adsorption electrodes.
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 disperses ionic impurities, reducing display unevenness and burn-in, and ensures a stable display state with high reliability by optimizing the electric field distribution to counteract the attraction of impurities to pixel electrodes.
Implementation Method 1
a first electric field is generated between the pixel electrodes and the first connection line layer to which the first potential lower than the common potential is applied. In addition, a second electric field is generated between the pixel electrodes and the second connection line layer to which the second potential higher than the common potential of the first substrate is applied
Implementation Method 2
the positive ionic impurities in the liquid crystal layer attracted by the first electric field generated between the first connection line layer and the pixel electrodes are reversed by the second electric field generated between the second connection line layer and the pixel electrodes, and may be dispersed in the liquid crystal layer
Data Source
AI summary
A liquid crystal device includes a positive potential connection line as a first connection line layer to which a first potential lower than a common potential is applied, between a pixel area and a seal member in the plan view, and a peripheral electrode as a second connection line layer that is provided between the positive potential connection line and a liquid crystal layer, is provided to overlap with at least a part of the positive potential connection line in the plan view, and to which a second potential higher than the common potential is applied.