Touch Panel Dielectric Structure for Thin Flexible Displays
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Solution Overview
Problem
Thinner stacked layers in touch screens lead to decreased touch precision and sensitivity, particularly in mutual-capacitive touch screens, especially in weak grounding scenarios where multi-finger or large-area touches result in false reporting, over-reporting, and disconnection due to reduced capacitance change.
Innovation Solution
A touch panel design featuring a base substrate with a first conductive structure comprising spaced-apart electrode structures and a dielectric structure that overlaps parts of the electrodes, reducing parasitic capacitance and enhancing mutual capacitance change by using dielectric substructures with varying dielectric constants, thereby improving touch accuracy and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the thickness of stacked layers in the screen is reduced to enable folding and curling, then flexibility is improved, but touch precision and sensitivity decrease
Solution Approach 1:
The patent applies local quality by introducing a dielectric structure with varying dielectric constants in specific regions. The dielectric structure includes a first dielectric substructure with a first dielectric constant and a second dielectric substructure with a second dielectric constant that is greater than the first. This spatial variation in dielectric properties locally enhances the electric field intensity between electrodes in the touch sensing region, thereby improving touch precision and sensitivity without increasing the overall thickness of the stacked layers.
Solution Approach 2:
The patent employs composite materials by combining multiple dielectric substructures with different dielectric constants within the touch panel structure. The dielectric structure comprises a first dielectric substructure and a second dielectric substructure, each with distinct dielectric properties. This composite dielectric arrangement optimizes the electric field distribution and enhances mutual capacitance change, resolving the contradiction between thin-layer flexibility and touch sensing performance.
2Length of stationary object
If the thickness of stacked layers is reduced, then the screen becomes thinner and more flexible, but touch sensitivity decreases
Solution Approach 1:
The dielectric structure implements local quality enhancement by positioning dielectric substructures with different dielectric constants in specific locations between the electrodes. The second dielectric substructure, having a higher dielectric constant than the first, is strategically placed to locally intensify the electric field in the touch sensing region. This localized enhancement of electric field intensity improves touch sensitivity despite the reduced overall thickness of the stacked layers.
Solution Approach 2:
The patent uses composite dielectric materials with different dielectric constants to maintain high touch sensitivity in a thin structure. The combination of a first dielectric substructure and a second dielectric substructure with varying dielectric properties creates an optimized electric field distribution that enhances mutual capacitance change, thereby improving touch sensitivity without increasing the thickness of the stacked layers.
3Adaptability or versatility
If the thickness of stacked layers is reduced, then flexibility is improved, but parasitic capacitance increases relative to mutual capacitance
Solution Approach 1:
The dielectric structure addresses the parasitic capacitance issue through local quality optimization. By introducing dielectric substructures with different dielectric constants in specific regions between the electrodes, the patent locally enhances the electric field intensity and mutual capacitance change. This selective enhancement improves the signal-to-noise ratio by boosting the desired mutual capacitance signal relative to parasitic capacitance, thereby maintaining touch accuracy in thin, flexible structures.
Solution Approach 2:
The patent employs composite dielectric materials with different dielectric constants to optimize the capacitance characteristics. The first dielectric substructure and second dielectric substructure, with their distinct dielectric properties, work together to enhance mutual capacitance while managing parasitic capacitance. This composite approach allows the thin structure to maintain high touch sensitivity by improving the ratio of mutual capacitance change to parasitic capacitance.
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 design effectively reduces parasitic capacitance and increases mutual capacitance change, enhancing touch accuracy and sensitivity, particularly in weak grounding conditions, by using dielectric structures with different dielectric constants to improve the electric field intensity between electrodes.
Implementation Method 1
a dielectric structure on the first conductive structure... A projection of the dielectric structure to the base substrate overlaps at least a part of a projection of the first electrode structure and the second electrode structure to the base substrate
Implementation Method 2
reducing parasitic capacitance and enhancing mutual capacitance change by using dielectric substructures with varying dielectric constants
Data Source
AI summary
The present application provides a touch panel, a display panel and a display device. The touch panel includes: a base substrate; a first conductive structure on the base substrate; and a dielectric structure on the first conductive structure. The first conductive structure includes: a first electrode structure and a second electrode structure that are spaced apart from each other. A projection of the dielectric structure to the base substrate overlaps at least a part of a projection of the first electrode structure and the second electrode structure to the base substrate.