Display Device Read-Out Pad Line Shielding for Scanning Accuracy
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Solution Overview
Problem
The existing display devices face challenges in improving the accuracy of the scanning function due to signal distortion in the pad lines, which affects the precision of light sensing signals.
Innovation Solution
The display device incorporates a substrate with a sub-region that includes a bending region and line group regions, where the read-out pad lines are strategically arranged to overlap with data dummy lines and direct current power pad lines, reducing signal distortion and improving scanning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If read-out pad lines are arranged in a limited width sub-region, then device integration is improved, but signal distortion increases due to parasitic capacitance and signal coupling
Solution Approach 1:
Data dummy lines are introduced as intermediary elements between the data pad lines and read-out pad lines. These dummy lines act as shields that redirect electromagnetic fields and reduce parasitic capacitance coupling, thereby improving signal integrity for the scanning function while maintaining compact device integration
Solution Approach 2:
The patent converts the harmful effect of parasitic capacitance and signal coupling into a beneficial shielding effect. By strategically positioning data dummy lines with specific width and spacing, the electromagnetic interference that would normally degrade signal quality is transformed into a protective shield that reduces noise and improves scanning accuracy
2Area of stationary object
If pad lines are densely packed in the sub-region, then area utilization is improved, but signal coupling defects increase leading to signal distortion
Solution Approach 1:
The patent applies local quality by creating distinct regions with different line densities and configurations. The data dummy lines are positioned specifically in high-interference areas between data and read-out lines, providing localized shielding where it is most needed while maintaining overall area efficiency
Solution Approach 2:
The data dummy lines are designed to create equipotential regions that equalize electromagnetic field distribution. By adjusting the width and spacing of these dummy lines, the patent achieves balanced field distribution that reduces signal coupling defects while maintaining compact layout
Data Source
AI summary
A display device includes a substrate; a circuit layer; and an element layer. The circuit layer includes data pad lines disposed in a second sub-region and electrically connecting between data lines and a display driving circuit; data dummy lines disposed in the second sub-region, extending from a bending region, and spaced apart from the display driving circuit; and read-out pad lines disposed in the second sub-region and electrically connecting between read-out lines and a scan driving circuit. The second sub-region includes a first line group region in which the data pad lines are disposed; second line group regions in which the data dummy lines are disposed; and a third line group region in which the read-out pad lines are disposed. At least a portion of the third line group region overlaps the second line group regions.