Liquid Crystal Device Wiring Layout for Impurity Control
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Solution Overview
Problem
Existing liquid crystal devices face challenges in preventing the intrusion of ionic impurities from seal materials into the display area, leading to display unevenness and quality degradation due to the influence of potential wiring lines.
Innovation Solution
The configuration of wiring lines is optimized in the non-display area, where common potential lines are positioned closer to the liquid crystal layer, and other wiring lines are placed farther away, minimizing the influence of potential wiring lines on the liquid crystal layer and seal material, thereby preventing ionic impurity intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-display area electrodes are caused to face common electrodes and common potentials are applied, then ionic impurity intrusion is suppressed, but display quality degradation occurs due to potential influence from wiring lines
Solution Approach 1:
The patent introduces a vertical layering dimension to separate wiring lines that supply different potentials. By placing common potential lines in a first wiring layer closer to the liquid crystal layer and other wiring lines in a second wiring layer farther away, the patent creates spatial separation in the vertical dimension. This dimensional separation allows both functions to coexist: common potential lines maintain liquid crystal alignment and suppress ionic impurity intrusion, while other wiring lines are positioned away to minimize their potential influence on display quality.
Solution Approach 2:
The patent segments the wiring lines into distinct groups based on their functional requirements. Common potential lines are separated from other wiring lines by assigning them to different wiring layers. This segmentation allows independent optimization of each group's position: common potential lines are placed close to the liquid crystal layer for effective alignment control and impurity suppression, while other wiring lines are placed farther away to reduce their harmful potential influence on the display area.
2Reliability
If wiring lines are extended in the non-display area, then electrical conduction is achieved, but ionic impurities are extruded from seal material into the display area
Solution Approach 1:
The patent resolves this contradiction by utilizing the vertical layering dimension. Wiring lines are extended in the non-display area to achieve electrical conduction, but those that supply potentials other than common potentials are placed in a second wiring layer farther from the liquid crystal layer. This vertical separation ensures that while conduction is maintained, the harmful influence of these wiring lines on ionic impurity extrusion is minimized.
Solution Approach 2:
The patent applies different spatial positioning strategies to different types of wiring lines based on their local functional requirements. Common potential lines are positioned close to the liquid crystal layer where their beneficial alignment effect is needed, while other wiring lines are positioned farther away where their harmful influence must be minimized. This local quality differentiation allows each wiring line type to perform its function optimally without causing harm.
Data Source
AI summary
In a first substrate of a liquid crystal device, among wiring lines extending to a non-display area interposed between a display area and an outer edge of a seal material, common potential lines are provided to interpose an interlayer insulating film between pixel electrodes. In contrast, the wiring lines which supply potentials different from common potentials is provided so as to interpose interlayer insulating films between the pixel electrodes. In the common potential lines, second wiring line sections extend so as to surround an entire circumference of the display area in the non-display area.