Touch Panel Shielding Structure to Reduce Touch Noise
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Solution Overview
Problem
Existing touch panels, particularly in Flexible Multi-Layer On Cell (FMLOC) technology, suffer from increased touch noise due to higher capacitor load and signal interference between the touch electrode and the cathode, which degrades the touch effect.
Innovation Solution
Incorporating a shielding structure between the light emitting unit and the touch electrode, which includes a metal shielding layer with a mesh structure and a transparent conductor layer, reduces coupling capacitance and signal interference, thereby improving the touch effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a touch panel uses capacitive type touch technology with integrated light emitting units and touch electrodes in close proximity, then the device achieves sensitive response and compact structure, but signal interference between the light emitting unit electrode and touch electrode increases causing poor touch effect
Solution Approach 1:
A shielding structure is introduced as an intermediary component between the light emitting unit and the touch electrode. This shielding structure includes a shielding electrode and insulating layers that act as a mediator to block electromagnetic field coupling between the light emitting unit electrode and the touch electrode, thereby reducing signal interference while maintaining the compact integrated structure of the touch panel
2Device complexity
If the touch electrode is positioned close to the light emitting unit for compact design, then device thickness is reduced, but coupling capacitance increases causing touch noise
Solution Approach 1:
The shielding structure serves as a physical intermediary barrier between the light emitting unit and touch electrode. By positioning the shielding electrode and insulating layers in between these two components, the coupling capacitance is reduced without increasing the overall device thickness, as the shielding structure is integrated within the existing layer stack of the touch panel
Solution Approach 2:
The shielding structure is strategically positioned only in the regions where electromagnetic interference occurs between the light emitting unit and touch electrode. The shielding electrode pattern and insulating layer configuration are optimized locally to provide interference protection while maintaining transparency and touch sensitivity in other areas of the display
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 shielding structure effectively decreases signal interference and touch noise, enhancing the overall touch performance of the touch panel.
Implementation Method 1
a coupling capacitance between an electrode of the light emitting unit and the touch electrode can be reduced
Data Source
AI summary
The present disclosure provides a touch panel and a display device. The touch panel includes a touch display region and a peripheral region surrounding the touch display region. The touch panel includes: a substrate; a light emitting unit on a side of the substrate and in the touch display region; a first inorganic packaging layer on a side of the light emitting unit away from the substrate; a shielding structure on a side of the first inorganic packaging layer away from the substrate and located in the touch display region; a first organic packaging layer on a side of the shielding structure away from the substrate; a second inorganic packaging layer on a side of the first organic packaging layer away from the substrate; and a touch electrode on a side of the second inorganic packaging layer away from the light emitting unit and in the touch display region.