Peripheral Electrode Segmentation for Ion Trapping in LCDs
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Solution Overview
Problem
In liquid crystal display devices, ions from impurities and sealing materials can concentrate in the liquid crystal layer, leading to decreased effective voltage and black unevenness in the display image, primarily due to the capture of positive ions, which leaves negative ions to concentrate and cause display quality issues.
Innovation Solution
A display device configuration with a peripheral region that includes multiple electrode regions with different voltage polarities, where the first electrode is provided in one region and the second electrode is in a different region, allowing for the trapping of both positive and negative ions by applying voltages of opposite polarities to these electrodes, thereby preventing ion concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only positive ions are captured in the peripheral region, then the majority of ions (positive polarity) are removed, but negative ions remain and concentrate around positively charged wires causing black unevenness
Solution Approach 1:
The peripheral region is divided into multiple regions (first to fourth regions) with different electrode configurations. First electrodes and second electrodes are placed in different regions, creating segmented zones with different voltage polarities that collectively trap both positive and negative ions throughout the peripheral region.
Solution Approach 2:
Different regions of the peripheral region are assigned different electrode types and voltage polarities. First electrodes receive first voltage of one polarity while second electrodes receive second voltage of opposite polarity, creating local quality variations that enable comprehensive ion trapping of both polarities across different spatial zones.
2Reliability
If electrodes with opposite voltage polarities are distributed in different regions of the peripheral region, then both positive and negative ions are trapped effectively, but the device structure and wiring complexity increase
Solution Approach 1:
The peripheral region structure serves multiple functions: it acts as a light shielding region, contains voltage supply wirings, and houses distributed first and second electrodes with opposite polarities. This multi-functional design integrates ion trapping capability into the existing peripheral structure without requiring entirely separate components.
Solution Approach 2:
The light shielding layer is extended into the peripheral region to create a unified structure that combines light shielding with ion trapping functionality. This integration reduces structural complexity by using the same peripheral region for multiple purposes rather than adding separate systems.
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 suppresses the deterioration of display quality by trapping both positive and negative ions, reducing black unevenness and improving the overall display image quality by ensuring even ion distribution.
Implementation Method 1
a first electrode and a second electrode provided in the peripheral region and connected to the voltage supply wiring. The peripheral region includes a first region, a second region, a third region, and a fourth region. The first electrode is provided in any region among the first to fourth regions. The second electrode is provided in a region different from the region where the first electrode is formed among the first to fourth regions. A polarity of a first voltage supplied to the first electrode is different from a polarity of a second voltage supplied to the second electrode.
Data Source
AI summary
A display device capable of preventing deterioration in display quality caused by ions in a liquid crystal layer particularly by taking a measure against positive and negative ions is provided. A display device includes: a display region; a peripheral region outside of the display region; a light shielding layer overlapped on the peripheral region; a voltage supply wiring provided in the peripheral region; and first and second electrodes provided in the peripheral region and connected to the voltage supply wiring. The peripheral region includes first, second, third, and fourth regions. The first electrode is provided in any region among the first to fourth regions. The second electrode is provided in a region different from the region where the first electrode is formed among these regions. A polarity of a first voltage supplied to the first electrode is different from that of a second voltage supplied to the second electrode.