Display Panel Shielding Layout for Touch Noise Reduction
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Solution Overview
Problem
Display devices experience degraded touch sensitivity due to parasitic capacitance between display driving and touch sensing lines, leading to noise in touch sensing signals.
Innovation Solution
Incorporation of a blocking pattern between display driving and touch lines, using a conductive material with a constant voltage application, to block touch noise and minimize electric field interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If display driving lines and touch sensing lines are disposed close to each other or overlapping on the display panel, then the device can provide both display and touch sensing functions in a compact structure, but parasitic capacitance between the lines causes noise in touch sensing signals and degrades touch sensitivity
Solution Approach 1:
A blocking pattern is introduced as an intermediary element between the display driving line and the touch sensing line. This blocking pattern, configured with a constant voltage (such as ground voltage), acts as a mediator that shields the touch sensing line from the electric field interference and parasitic capacitance effects of the display driving line, thereby reducing noise while allowing both lines to coexist in close proximity
Solution Approach 2:
The blocking pattern is segmented into multiple portions that can be selectively positioned between different display driving lines and touch sensing lines. This segmentation allows the shielding effect to be applied specifically where interference occurs, rather than requiring a continuous blocking structure across the entire display panel, thus reducing overall parasitic capacitance while maintaining effective noise blocking
2Measurement precision
If a blocking pattern is introduced between display driving lines and touch sensing lines to reduce parasitic capacitance and noise, then touch sensitivity is improved, but the device structure and manufacturing process become more complex
Solution Approach 1:
The blocking pattern is merged with existing display driving line structures or pixel electrode structures, allowing the shielding function to be integrated into the existing device architecture rather than adding completely separate components. This merging approach reduces structural complexity while maintaining the noise-blocking functionality
Solution Approach 2:
The blocking pattern serves multiple functions simultaneously: it acts as a shield against parasitic capacitance, provides a reference voltage level, and can be integrated with existing pixel structures. This multi-functionality reduces the need for additional dedicated components, thereby simplifying the overall device structure despite the added shielding capability
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
Improves touch sensitivity and reduces power consumption by mitigating noise and interference between display driving and touch sensing lines.
Implementation Method 1
due to parasitic capacitance between the lines for display driving and the lines for touch sensing, the performance of touch sensing may be degraded
Data Source
AI summary
A display device includes a substrate including an active area and a non-active area at a periphery of the active area; a signal line, in the non-active area, configured to supply a display signal; a touch line, over the signal line, configured to supply a touch signal; a first blocking pattern between the signal line and the touch line; and a second blocking pattern connected to the first blocking pattern.