Liquid Crystal Electrooptic Apparatus Ion Trapping
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Solution Overview
Problem
Existing electrooptic apparatuses, such as liquid crystal projectors, face issues with ionic impurities from sealing materials diffusing into the liquid crystal layer, causing display defects and reducing the driving speed and voltage retention rate, which affects the display quality.
Innovation Solution
The apparatus includes a first pixel electrode within the display region and a second pixel electrode outside the display region, with a transistor and circuit configuration that allows the second pixel electrode to overlap the circuit in plan view, effectively guiding ionic impurities away from the display region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dummy pixel region is disposed outside the display region to capture ionic impurities, then ionic impurities can be trapped, but the width of the dummy pixel region cannot be sufficiently ensured and ionic impurities may protrude into the display region
Solution Approach 1:
The patent utilizes the third dimension (vertical stacking) by placing the dummy pixel region underneath the display region in plan view. This allows the dummy pixel region to have sufficient area for effective ion trapping while not occupying lateral space that would reduce its width. The overlapping arrangement in the vertical dimension resolves the contradiction between trapping effectiveness and region width.
2Reliability
If dummy pixel groups are disposed in a wide range outside the display region to suppress ionic impurity defects, then ionic impurity trapping is improved, but peripheral circuits and dummy pixel groups cannot be disposed in an overlapping manner
Solution Approach 1:
The patent resolves the layout conflict by arranging the dummy pixel region and peripheral circuits in the vertical dimension rather than requiring separate lateral spaces. The dummy pixel region is positioned to overlap with the peripheral circuits in plan view, utilizing the third dimension to eliminate spatial conflicts and reduce device complexity.
Solution Approach 2:
The patent merges the functional regions by allowing the dummy pixel region and peripheral circuits to occupy the same lateral footprint. This combining of spaces reduces the overall device area and simplifies the layout design while maintaining both the ion trapping function and circuit functionality.
3Area of stationary object
If the display region and ion trap electrode are disposed close to each other to save space, then area is reduced, but ionic impurities induced to the ion trap electrode may protrude into the display region
Solution Approach 1:
The patent positions the dummy pixel region underneath the display region in the vertical dimension, allowing close spacing in the lateral dimension without compromising display region purity. The vertical separation ensures that ionic impurities trapped in the dummy pixel region do not protrude into the display region, even when the lateral distance is minimal.
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 suppresses the occurrence of defects originating from ionic impurities, ensuring improved display quality by preventing their diffusion into the liquid crystal layer.
Implementation Method 1
the second pixel electrode... effectively guiding ionic impurities away from the display region
Data Source
AI summary
A liquid crystal apparatus includes a first pixel electrode in a display region, and a second pixel electrode and a circuit such as a scan line driving circuit outside the display region. A TFT provided corresponding to the second pixel electrode is separated from the circuit, and the second pixel electrode extends to the region that overlaps the circuit.