Liquid Crystal Device Peripheral Electrode Impurity Trapping
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Solution Overview
Problem
In liquid crystal devices, ionic impurities can cause image sticking and deterioration in display quality due to their accumulation in the image display region, especially when peripheral electrodes for trapping these impurities are not positioned correctly, either too close to the image display region or failing to attract them effectively.
Innovation Solution
The liquid crystal device incorporates peripheral electrodes formed at appropriate positions using conductive patterns in the peripheral region, which apply a potential different from the common potential, creating an electric field to draw and trap ionic impurities away from the image display region, while also ensuring the electrodes do not interfere with the peripheral circuit section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If peripheral electrodes are formed on the inner side of the regions where dummy pixel electrodes are formed, then the distance between peripheral electrodes and image display region becomes short, but ionic impurities trapped by peripheral electrodes have an influence on the image display region
Solution Approach 1:
The patent positions peripheral electrodes in the peripheral region sandwiched between the image display region and sealing member, utilizing the spatial dimension to achieve appropriate distance from the image display region. This dimensional arrangement allows peripheral electrodes to trap ionic impurities effectively while maintaining sufficient distance to prevent influence on the image display region, resolving the contradiction between short distance and harmful influence.
2Length of moving object
If peripheral electrodes are formed on the outer side of the regions where dummy pixel electrodes are formed, then ionic impurities inside the image display region may rarely be attracted by the peripheral electrodes, but the electrodes are positioned farther from the image display region
Solution Approach 1:
The patent applies different potentials to peripheral electrodes in different regions, creating localized electric fields that effectively attract ionic impurities. By making the potential application selective and localized, the system achieves reliable attraction of ionic impurities while maintaining appropriate positioning in the peripheral region, resolving the contradiction between distance and attraction ability.
3Shape
If dummy pixel electrodes are formed to flatten the inside of the image display region, then the difference in height between image display region and peripheral region is reduced, but it becomes difficult to dispose peripheral electrodes at appropriate positions
Solution Approach 1:
The patent segments the electrode structure into distinct components: dummy pixel electrodes formed from a conductive film at the same layer as pixel electrodes, and peripheral electrodes formed separately in the peripheral region. This segmentation allows independent optimization of each component's position and function, enabling both flatness achievement through dummy electrodes and appropriate positioning of peripheral electrodes without mutual interference.
Solution Approach 2:
The patent introduces an insulation film as an intermediary layer between the conductive patterns (dummy pixel electrodes) and the peripheral electrodes. This intermediary insulation film allows both structures to coexist at appropriate positions without electrical shorting, facilitating proper positioning of peripheral electrodes while maintaining the flattening effect of dummy pixel 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 prevents ionic impurities from affecting the image display region, maintaining display quality by ensuring the peripheral electrodes are positioned correctly and efficiently trap impurities, even when dummy pixel electrodes are formed, thereby improving the flatness and reducing the risk of image deterioration.
Implementation Method 1
different potentials are applied to the first and second peripheral electrodes, the polarities of the potentials to be applied to the first and second peripheral electrodes for each frame are reversed, and minute fluctuation of the liquid crystal and the movement of the ionic impurities are achieved by a transverse electric field between the first and second peripheral electrodes
Implementation Method 2
the peripheral electrodes for trapping the ionic impurities are formed at the positions overlapping the conductive patterns. Therefore, even when the conductive patterns are formed, the peripheral electrodes can be formed at the positions at which a distance from the image display region is appropriate. Accordingly, it is possible to prevent the ionic impurities trapped in the peripheral electrodes from having an influence on the image display region. Further, it is possible to reliably draw the ionic impurities, which are likely to cohere in the image display region, to the peripheral electrodes
Data Source
AI summary
In at least one embodiment of the disclosure, a liquid crystal device comprises a plurality of conductive patterns formed of a conductive film in a peripheral region between an image display region and a sealing member. The conductive patterns are formed at a same layer as a plurality of pixel electrodes. An insulation film is formed on a side facing a counter substrate so as to correspond to the plurality of conductive patterns and a plurality of pixel electrodes. Peripheral electrodes are formed in a region overlapping the plurality of conductive patterns in a plan view on a side on which the counter substrate is located so as to correspond to the insulation film in the peripheral region.