Ion Trap Electrodes and Diffusion Preventing Portions in Electro-Optical Devices
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Solution Overview
Problem
Existing electro-optical devices face challenges in efficiently trapping and preventing the diffusion of ionic impurities from the sealing material into the liquid crystal layer, leading to uneven distribution and decreased optical modulation characteristics, particularly when the potential applied to ion trap electrodes is paused.
Innovation Solution
The electro-optical device incorporates a configuration with multiple ion trap electrodes applied with signals of different phases and a diffusion preventing portion with a thinner electro-optical layer thickness between the pixel electrodes and the ion trap electrodes, ensuring efficient sweeping of ionic impurities away from the display region and preventing their diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a trap electrode is provided between the display region and the sealing material to sweep ionic impurities, then the ionic impurities can be trapped, but when the potential application is paused, high-concentration ionic impurities will diffuse into the display region due to concentration difference
Solution Approach 1:
The patent applies a preliminary action by maintaining a residual potential or applying a preventive potential to the trap electrode before pausing, creating a potential barrier that prevents ionic impurities from diffusing into the display region. This proactive measure addresses the concentration difference issue by establishing a preventive electric field in advance.
Solution Approach 2:
The trap electrode serves as an intermediary between the sealing material and the display region, using electric potential as a mediating factor to control ionic impurity movement. By adjusting the potential on the trap electrode, the system creates a controllable barrier that mediates the interaction between ionic impurities and the display region.
2Productivity
If the liquid crystal layer thickness is reduced to efficiently sweep ionic impurities, then the sweeping efficiency improves, but the liquid crystal layer becomes too thin to maintain proper electro-optical performance
Solution Approach 1:
The patent applies local quality by creating a non-uniform liquid crystal layer thickness distribution: a thinner region near the trap electrode for efficient impurity sweeping, and a normal thickness region in the display area for maintaining electro-optical performance. This spatially varying structure allows each region to optimize its function.
Solution Approach 2:
The liquid crystal layer is segmented into functionally distinct regions with different thicknesses. The first region (near the trap electrode) has reduced thickness to enhance impurity sweeping, while the second region (display region) maintains standard thickness for proper optical performance. This segmentation allows simultaneous optimization of both sweeping efficiency and display quality.
3Reliability
If walls are provided between the trap electrode and the display region to retain ionic impurities, then the ionic impurities are retained, but the liquid crystal layer becomes extremely thin making it difficult to efficiently sweep impurities
Solution Approach 1:
The patent changes the thickness parameter of the liquid crystal layer spatially, creating a gradient structure. By controlling the thickness to be thinner near the trap electrode and normal in the display region, the system achieves both impurity retention and efficient sweeping without requiring physical walls that would create an extremely thin layer throughout.
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 reduction in image quality due to ionic impurity distribution and prevents high-concentration impurities from diffusing into the display region, even when the potential to the ion trap electrodes is paused, maintaining image quality and optical modulation characteristics.
Implementation Method 1
sweep the ionic impurities from the display region to the outside of the display region by the ion trap electrode
Implementation Method 2
when the application of the potential to the ion trap electrode is paused, high-concentration ionic impurities condensed near the ion trap electrode will diffuse into the display region due to a concentration difference
Data Source
AI summary
In an electro-optical device, a first ion trap electrode, a second ion trap electrode, and a third ion trap electrode are provided between a pixel region and a sealing material, the first ion trap electrode, the second ion trap electrode, and the third ion trap electrode are applied with signals whose phases are shifted by 120° from each other. Since a diffusion preventing portion in which the thickness of an electro-optical layer is thinner than the thickness of the pixel region is provided between a pixel electrode and the first ion trap electrode, ionic impurities are less likely to diffuse into the pixel region even if application of a potential to an ion trap electrode is paused.