LCD Pixel Electrode Repair via Laser Cutting
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Solution Overview
Problem
Conventional methods fail to repair pixel defects in LCDs with minute branch pixel electrode structures due to the light blocking layer obstructing laser irradiation, leading to incomplete disconnection of drain electrode connections and persistent data voltage application.
Innovation Solution
The design includes a pixel electrode structure with a stem and minute branches, where the edge connection is modified to create a gap between the drain electrode connection and the light blocking layer, allowing laser irradiation on the stem to disconnect the drain electrode connection without blocking, thereby preventing data voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking layer is used to prevent light leakage, then light leakage is prevented, but laser irradiation is blocked and pixel defect repair becomes impossible
Solution Approach 1:
The patent extracts the drain electrode connection from under the light blocking layer by creating an exposed region. This allows the laser to access and cut the drain electrode connection for pixel defect repair while the light blocking layer remains in place to prevent light leakage in other areas.
Solution Approach 2:
The light blocking layer is segmented into covered and uncovered regions. The drain electrode connection is selectively exposed by removing the light blocking layer in a specific area, allowing laser access while maintaining light blocking functionality in other areas.
2Ease of repair
If the drain electrode connection is cut by laser, then pixel defect is repaired, but the light blocking layer prevents laser from reaching the drain electrode connection
Solution Approach 1:
The drain electrode connection is extracted from under the light blocking layer by creating an exposed region where the light blocking layer is removed. This allows the laser to directly access and cut the drain electrode connection without being blocked by the light blocking layer.
Solution Approach 2:
The light blocking layer is preliminarily removed in the region where the drain electrode connection is located before the laser cutting process. This preliminary action creates an access path for the laser to reach and cut the drain electrode connection.
3Reliability
If the edge connection is connected to the drain electrode connection, then the pixel electrode is properly connected, but data voltage is applied through the edge connection and pixel defect cannot be repaired
Solution Approach 1:
The edge connection is extracted from the drain electrode connection by creating a gap between them. This separation ensures that when the drain electrode connection is cut by laser, the edge connection is not affected and the pixel electrode remains electrically isolated, preventing data voltage application.
Solution Approach 2:
The electrical connection is segmented into separate regions: the edge connection and the drain electrode connection are divided by a gap. This segmentation allows independent control and repair of the drain electrode connection without affecting the edge connection.
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 method effectively repairs pixel defects by ensuring the laser can cut the drain electrode connection without interference from the light blocking layer, ensuring the pixel electrode is floated and the black state is maintained.
Implementation Method 1
irradiating a laser to a region corresponding to the portion of the drain electrode connection disposed in a region not covered by the light blocking layer to disconnect the drain electrode connection
Data Source
AI summary
A liquid crystal display (“LCD”) includes a first insulation substrate, a thin film transistor (“TFT”) disposed on the first insulation substrate, and a pixel electrode disposed on the first insulation substrate and connected to a drain electrode of the TFT, wherein the pixel electrode includes an edge connection and a drain electrode connection, a portion of the edge connection pattern near a position where the drain electrode connection and the edge connection intersect is removed in the LCD, the pixel electrode further includes a stem and a plurality of minute branches, and a laser is irradiated to one intersection point between the stem and the minute branches among the stem near the light blocking layer to cut the portion of the pixel electrode.