Liquid Crystal Device Peripheral Electrode Ionic Impurity Trapping
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Solution Overview
Problem
In liquid crystal devices, ionic impurities from sealing materials can cause image deterioration due to agglomeration in the image display region, leading to issues like burn-in and waveform distortion in signal lines due to capacitive coupling with peripheral electrodes.
Innovation Solution
A liquid crystal device design featuring a peripheral electrode along the sealing material with a potential different from the common potential, which attracts and retains ionic impurities outside the image display region, and a trapping electrical supply line that extends without intersecting signal lines to prevent capacitive coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a peripheral electrode is extended along the sealing material to trap ionic impurities, then ionic impurity agglomeration in the image display region is prevented, but waveform distortion is generated in signal lines due to capacitive coupling
Solution Approach 1:
A shielding electrode is introduced as an intermediary element between the peripheral electrode and the signal lines. This shielding electrode acts as a mediator that blocks the capacitive coupling between the peripheral electrode (which carries trapping potential) and the signal lines, thereby preventing waveform distortion while maintaining the ionic impurity trapping function
Solution Approach 2:
The electrode structure is segmented into multiple functional parts: the peripheral electrode for trapping ionic impurities, the shielding electrode to block capacitive coupling, and the signal lines for driving the display. This segmentation allows each component to perform its specific function independently without interfering with others
2Reliability
If an alternating current is applied to the peripheral electrode for ionic impurity trapping, then ionic impurities are attracted and retained in the peripheral electrode, but capacitive coupling between the peripheral electrode and signal lines causes waveform distortion
Solution Approach 1:
The shielding electrode serves as a mediator that physically and electrically separates the peripheral electrode from the signal lines. It blocks the capacitive coupling path while allowing the alternating current to continue flowing through the peripheral electrode for effective ionic impurity trapping
Solution Approach 2:
The shielding electrode is positioned in a different spatial dimension (between the peripheral electrode and signal lines) to intercept and block the capacitive coupling field, effectively adding a dimensional barrier that prevents interference while maintaining the trapping function
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 impurity agglomeration in the image display region, maintaining display quality by avoiding capacitive interference with signal lines, thus enhancing the reliability of liquid crystal devices.
Implementation Method 1
a peripheral electrode that electrically conducts to the electrical supply line in a peripheral region interposed between the image display region and the sealing material... supplies a potential for ionic impurity trapping different from the common potential
Data Source
AI summary
In an element substrate of a liquid crystal device, a peripheral electrode to which a potential different from a common potential applied to a dummy pixel electrode and the like is applied is formed in a region interposed between an image display region and a sealing material. An electrical supply line that supplies the potential from the side to the peripheral electrode runs through the outside from a scanning line driving circuit portion.