Shield Line Cutting Portions for Data Line Repair in LCD Arrays
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Solution Overview
Problem
In-plane switching (IPS) mode liquid crystal displays face drive failures due to open circuit failures in data lines, which are difficult to repair, especially when shield lines are positioned on the data lines.
Innovation Solution
A liquid crystal display array substrate design that includes a shield line with cutting portions of narrower width overlapping the data line, allowing for easy disconnection and repair using a laser CVD repair device, forming contact holes to reconnect the data line and prevent damage to surrounding components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shield line is formed on the data line to prevent voltage difference, then drive failure is prevented, but open circuit failure becomes difficult to repair
Solution Approach 1:
The shield line is divided into multiple segments by forming cutting portions that remove portions of the shield line. This segmentation allows the shield line to be disconnected at specific locations to access and repair open circuit failures in the data line, while maintaining shielding functionality in other areas.
2Ease of manufacture
If laser irradiation power is increased to disconnect shield line, then disconnection is achieved, but surrounding components are damaged
Solution Approach 1:
The cutting portions of the shield line are designed with a width smaller than the data line width, creating a localized vulnerable area that requires lower laser power to disconnect. This local quality change enables precise disconnection of the shield line without transmitting excessive energy to surrounding components.
3Ease of manufacture
If shield line width is reduced at cutting portions, then laser disconnection becomes easier, but shielding effectiveness may be reduced
Solution Approach 1:
The shield line is segmented such that only specific cutting portions have reduced width, while the majority of the shield line maintains its original width for effective shielding. This segmentation strategy balances the need for easy laser disconnection at specific points with the requirement for maintaining shielding effectiveness in the overall structure.
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
The method effectively reduces the failure percentage of data line repairs from 0.41% to 0.04%, preventing damage to the common electrode and improving the reliability of the liquid crystal display array substrate.
Implementation Method 1
irradiating a laser onto the cutting portions positioned at both sides of the shield line overlapping a open portion of the data line
Data Source
AI summary
A liquid crystal display array substrate and a method for manufacturing the same are discussed. The liquid crystal display array substrate includes a gate line arranged on a substrate in one direction, a data line which crosses the gate line and defines a plurality of pixel areas, a thin film transistor formed at a crossing of the gate line and the data line, a pixel electrode connected to the thin film transistor, and a common electrode which is positioned opposite the pixel electrode and forms an electric field. The common electrode includes a shield line overlapping the data line, and the shield line includes at least two cutting portions having a width less than other portion of the shield line.