Display Substrate Shielding Over Wiring for Crack Detection
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Solution Overview
Problem
Electrostatic charges generated during the production and use of display devices can shift the characteristics of thin-film transistors in pixel circuits, affecting the display effect.
Innovation Solution
A display substrate design with a conductive layer positioned over detection wiring and a patterned conductive material layer in the frame area, connected to a constant electrical signal, to prevent electrostatic charges from being conducted to the pixel circuit layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive layer is added to prevent electrostatic charge conduction, then the reliability of the display substrate is improved, but the device complexity increases
Solution Approach 1:
The conductive layer is segmented into multiple patterns (first conductive pattern, second conductive pattern, third conductive pattern) distributed at different locations. This segmentation allows the conductive layer to prevent electrostatic charge conduction while reducing the overall complexity compared to a continuous conductive layer, and enables independent optimization of each segment's position and size.
Solution Approach 2:
The conductive layer is positioned in a specific layer structure above the detection wiring, utilizing the vertical dimension to achieve electrostatic shielding without interfering with the horizontal signal transmission of the detection wiring. This dimensional separation allows both functions to coexist without increasing planar complexity.
2Reliability
If the conductive layer covers the crack detection area, then the protection against electrostatic charges is improved, but the ability to detect cracks in the detection wiring is compromised
Solution Approach 1:
The conductive layer is divided into multiple non-contiguous patterns rather than forming a solid cover. This segmentation allows the detection wiring to be partially exposed between the conductive patterns, enabling crack detection through the detection wiring while still providing electrostatic protection through the distributed conductive patterns.
Solution Approach 2:
The conductive layer has different properties in different regions: it provides full coverage in areas requiring electrostatic protection, but leaves gaps in areas where crack detection is needed. The detection wiring itself has different properties (conductive vs. insulating) in different segments to enable both protection and detection functions simultaneously.
3Reliability
If the detection wiring is positioned under the conductive layer, then the electrostatic protection is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The conductive layer is segmented into multiple patterns with defined spacing and positioning. This segmentation provides reference features for alignment during manufacturing, reducing the precision requirements compared to a continuous conductive layer. The segmented structure allows for tolerance in positioning while maintaining effective electrostatic protection.
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
Prevents electrostatic charge conduction to the pixel circuit, improving the display effect by maintaining the characteristics of thin-film transistors and enhancing display reliability.
Implementation Method 1
the conductive layer is disposed above the detection wiring, and at least a portion of an orthographic projection of the detection wiring on the base substrate falls within an orthographic projection of the conductive layer on the base substrate
Data Source
AI summary
A display substrate, a display apparatus, and a method of detecting cracks in a display substrate. A display substrate includes a display area and a frame area disposed at least on a side of the display area, the frame area including a crack detection area. The display substrate includes a base substrate, a detection wiring on the base substrate, and a conductive layer on a side of the detection wiring away from the base substrate; the conductive layer is disposed in the frame area; the detection wiring is disposed in the crack detection area; and at least a portion of an orthographic projection of the detection wiring on the base substrate falls within an orthographic projection of the conductive layer on the base substrate. A display apparatus includes the display panel.