Display Panel Test Line Corrosion Protection via Diode Isolation
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Solution Overview
Problem
Liquid crystal display (LCD) test lines exposed outside the panel are prone to damage from heat and moisture, which can lead to corrosion and subsequently affect the signal lines, causing defects in the display.
Innovation Solution
A display panel design featuring an insulation substrate with diode units and thin film transistors, where the test lines are electrically connected through diodes, and an insulating layer and semiconductor layer are used to prevent corrosion from spreading to the wires, with a cutting line and shorting bars to manage signal transmission and static electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If test lines are exposed outside the liquid crystal display for array testing, then array testing can be performed to determine pixel defects, but the exposed test lines are damaged by heat or moisture from outside, causing corrosion that transmits to signal lines
Solution Approach 1:
The patent divides the test line structure into separate functional zones: test lines remain in the peripheral area for testing, while signal lines are confined to the display area. The insulation substrate creates physical and electrical segmentation between these zones, preventing corrosion on exposed test lines from affecting the signal lines that carry display signals.
Solution Approach 2:
The insulation substrate acts as an intermediary barrier between the exposed test lines in the peripheral area and the signal lines in the display area. This insulating layer prevents direct electrical contact and blocks the transmission of corrosion damage from the test lines to the signal lines, while still allowing the test lines to perform their testing function.
2Adaptability or versatility
If test lines are separated from signal lines after array testing, then normal display operation is enabled, but the separated test lines remain exposed and vulnerable to environmental damage
Solution Approach 1:
The patent maintains spatial segmentation between test lines and signal lines throughout the device lifecycle. Test lines are confined to the peripheral area and remain electrically separated from signal lines in the display area, allowing the display to operate normally while the test lines stay isolated and protected in their designated zone.
Solution Approach 2:
The patent applies different functional qualities to different regions: the peripheral area is designed for testing with exposed test lines, while the display area is optimized for signal transmission. The insulation substrate provides localized protection where needed, allowing test lines to remain accessible in the periphery while protecting signal lines in the display area from environmental damage.
Data Source
AI summary
A display panel includes an insulation substrate having a display area and a peripheral area, wires disposed on the insulation substrate in the display area, first and second testing lines disposed on the insulation substrate and aligned substantially parallel to each other, and a diode unit disposed between the wires and one of the first testing line and the second testing line. The wires extend from the display area into the peripheral area and through diodes included in the diode unit, and the wires are electrically connected to the one of the first testing line and the second testing line.