Display Device Conductive Portion Shielding Clock–Touch Overlap
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Solution Overview
Problem
Touch detection units in display devices are compromised by noise from signals emanating from clock lines, leading to false or inaccurate results, particularly in sensitive applications like fingerprint identification.
Innovation Solution
A conductive portion is disposed between clock and touch signal lines to cover their overlapping area, reducing noise interference and maintaining uniform touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch detection units are made extremely sensitive to detect light touches or fingerprint ridges, then detection capability is improved, but false or inaccurate results occur due to noise from clock signal lines
Solution Approach 1:
A conductive portion is introduced as an intermediary element positioned between the clock signal lines and touch signal lines. This conductive portion acts as a shield that intercepts and redirects electromagnetic noise from clock lines before it can interfere with touch signal lines, thereby maintaining both high sensitivity and accuracy of the touch detection unit
2Area of stationary object
If clock signal lines and touch signal lines are placed close together to reduce device area, then area is reduced, but noise interference from clock lines to touch lines increases
Solution Approach 1:
The conductive portion serves as a protective intermediary that enables close proximity placement of clock and touch signal lines without suffering from noise interference. By positioning this shield between the two signal line groups, the design achieves compact area while the conductive portion blocks electromagnetic coupling that would otherwise occur at close distances
Solution Approach 2:
The conductive portion is strategically positioned only in the overlapping area where clock signal lines and touch signal lines cross or run parallel. This localized shielding approach provides noise protection precisely where interference occurs most severely, while minimizing the overall area occupied by the shielding 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 conductive portion effectively shields touch signal lines from noise generated by clock signal lines, ensuring consistent and accurate touch sensitivity.
Implementation Method 1
a conductive portion disposed between the plurality of clock signal lines and the plurality of touch signal lines and extending through an overlapping area where the plurality of clock signal lines and at least some of the touch signal lines overlap each other
Data Source
AI summary
A display device including a circuit layer having a driving circuit layer with a plurality of clock signal lines, a touch detection unit having a touch detection part and a plurality of touch signal lines electrically connected to the touch detection unit, and a conductive portion disposed between the plurality of clock signal lines and the plurality of touch signal lines and configured to cover an overlapping area where the plurality of clock signal lines and the plurality of touch signal lines overlap.