Liquid Crystal Display Repair Region Insulation
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Solution Overview
Problem
In liquid crystal displays, the laser repair process for defective pixels can generate metal debris, leading to short-circuits between the common electrode and pixel electrode, degrading image quality due to undesired disconnection or short-circuiting of wirings.
Innovation Solution
A recess portion with a short-circuiting prevention insulating layer is formed on the second insulation substrate in the repair region, increasing the distance between the pixel and common electrodes to prevent short-circuits, and the insulating layer is made of the same material as the column spacer to reduce manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a laser repair process is performed on defective pixels, then pixel defects can be corrected, but metal debris is generated causing short-circuits between electrodes
Solution Approach 1:
An insulating layer is introduced as an intermediary between the pixel electrode and common electrode in the repair region. This mediator prevents direct contact between electrodes that could be bridged by metal debris from laser repair, while not interfering with the laser repair process itself.
Solution Approach 2:
The insulating layer is formed in advance in the repair region before laser repair is performed. This preliminary protective measure ensures that when laser repair is later conducted, any metal debris generated cannot cause short-circuits because the insulating barrier is already in place.
2Reliability
If the distance between pixel electrode and common electrode is increased to prevent short-circuit, then short-circuit risk is reduced, but device structure becomes more complex
Solution Approach 1:
The insulating layer is applied locally only in the repair region where short-circuit risk exists, rather than increasing the electrode distance across the entire device. This localized approach prevents short-circuits in critical areas without adding unnecessary complexity or reducing aperture ratio in non-problem areas.
3Reliability
If different materials are used for the insulating layer and column spacer, then functional requirements can be optimized, but manufacturing process complexity increases
Solution Approach 1:
The insulating layer and column spacer are formed using the same material and manufacturing process. This merging of materials and processes simplifies production by reducing the number of distinct manufacturing steps while still achieving the short-circuit prevention function in the repair region.
Data Source
AI summary
There is provided a liquid crystal display including a first insulation substrate, a gate line and a data line that are positioned to cross each other on the first insulation substrate, a thin film transistor including a gate electrode connected to the gate line, a semiconductor layer positioned to overlap the gate electrode, and source and drain electrodes connected to the semiconductor layer, a pixel electrode connected to the thin film transistor, a second insulation substrate facing the first insulation substrate, a light blocking member disposed on the second insulation substrate, a common electrode disposed on the planarization layer, and a short-circuiting prevention insulating layer disposed on the common electrode in a region corresponding to a repair region.