Active Matrix Substrate Layout for Touch Sensitivity and ESD Protection
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Solution Overview
Problem
Existing active matrix substrates face issues with high defect rates due to static electricity and increased risk of short circuits when both touch detection and defect reduction structures are present in the frame region, leading to reduced yield and effectiveness in touch detection.
Innovation Solution
The active matrix substrate incorporates a frame touch electrode at a first layer and a frame element at a second layer in the frame region, with specific regions for touch detection and electrostatic discharge protection, respectively, to minimize overlap and reduce the risk of short circuits while enhancing touch sensitivity and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If both touch detection structure and defect reduction structure are disposed in the frame region, then touch detection sensitivity is improved, but the risk of short circuit increases due to increased overlap area
Solution Approach 1:
The patent applies dimensional separation by placing the touch detection structure and defect reduction structure in different vertical layers within the frame region. The first structure is formed at a first layer while the second structure is formed at a second layer, allowing both structures to coexist in the same planar region without overlapping in the vertical dimension, thereby eliminating short circuit risks while maintaining touch detection sensitivity.
Solution Approach 2:
The patent implements a nested configuration where one structure is positioned within the vertical space of another structure in the frame region. The touch detection structure at the first layer and the defect reduction structure at the second layer create a nested arrangement that maximizes space utilization while preventing electrical interference between the two structures.
2Reliability
If dummy structures are disposed in the frame region to reduce defect rate, then pixel protection is improved, but the area for touch detection is reduced
Solution Approach 1:
The patent resolves the area conflict by utilizing the vertical dimension. Both the defect reduction structure and the touch detection structure are positioned in the same planar footprint of the frame region but at different vertical layers, allowing the touch detection area to be maximized without compromising pixel protection capabilities.
3Measurement precision
If frame touch electrode is disposed in the frame region, then touch sensitivity at pixel region edges is improved, but the complexity of the structure increases
Solution Approach 1:
The frame touch electrode structure serves multiple functions simultaneously: it acts as both a touch detection electrode and a structural element that defines the frame region boundary. This multi-functionality reduces the need for separate dedicated components, thereby improving touch sensitivity while minimizing the increase in overall structural complexity.
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 configuration improves touch detection sensitivity at the pixel region edges and reduces the likelihood of short circuits, thereby increasing the yield and reliability of the active matrix substrate.
Implementation Method 1
a frame element, formed at a second layer different from the first layer in the frame region, that suppresses an electrostatic discharge failure of at least one of the plurality of pixels
Data Source
AI summary
An active matrix substrate includes a touch electrode disposed in a pixel region, a frame touch electrode disposed in a frame region, and a dummy array segment disposed in the frame region. The frame region includes a first dummy region, provided in a position adjacent to the pixel region, where the frame touch electrode is disposed and a second dummy region provided in a position opposite to the pixel region across the first dummy region. In the second dummy region, the frame touch electrode is not disposed, but the dummy array segment is disposed.