Wave-Shaped Touch Electrodes for Thin Display Sensitivity
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Solution Overview
Problem
Thin display products face issues with low sensitivity and poor touch-control performance due to the Low Ground Mass (LGM) problem, particularly in weak grounding conditions and large-area multi-point touch-control scenarios, where the change in mutual capacitance is difficult to detect, leading to problems like low sensitivity, poor precision, and ghost points.
Innovation Solution
A touch-control panel with a substrate and a sensing layer featuring wave-shaped touch-control electrodes and branches that increase the fringe field and mutual capacitance, improving sensitivity and precision by enhancing the arrangement and connection of touch-control units, including first and second electrodes with conductive connection portions, and the use of dummy electrodes for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the display product thickness is reduced to achieve lightness and thinness, then the device becomes thinner and lighter, but the Low Ground Mass (LGM) problem becomes more prominent, causing low sensitivity and poor touch-control precision
Solution Approach 1:
The patent introduces a wave-shaped structure to the touch-control electrodes, transforming the flat two-dimensional electrode surface into a three-dimensional undulating surface. This dimensional change increases the effective surface area and fringe field interaction between electrodes, thereby enhancing mutual capacitance and touch sensitivity despite the reduced overall device thickness.
Solution Approach 2:
The touch-control electrodes are designed with wave-shaped (curved) surfaces instead of flat surfaces. The curvature of the wave-shaped structure increases the electric field interaction area and strengthens the fringe field effect, which compensates for the reduced ground mass in thin display products and improves touch detection capability.
2Area of stationary object
If the device is in a weak ground state with large-area multi-point touch-control, then the R-transmission effect causes small mutual capacitance change, but the touch-control chip cannot detect the change, leading to ghost points and jump points
Solution Approach 1:
The wave-shaped electrode structure creates a more distributed and enhanced electric field across the touch surface. This curved geometry increases the fringe field effect at multiple points simultaneously, improving the detection accuracy of mutual capacitance changes even in large-area multi-point touch scenarios and reducing ghost points and jump points.
Solution Approach 2:
The patent changes the physical geometry parameter of the electrodes from flat to wave-shaped, which fundamentally alters the electric field distribution and mutual capacitance characteristics. This parameter change increases the sensitivity of capacitance detection and improves the signal-to-noise ratio, enabling accurate detection even in weak ground states with large-area touch control.
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 solution significantly increases the mutual capacitance change and basic mutual capacitance value, enhancing touch-control sensitivity and accuracy in the LGM state, addressing the limitations of existing technologies by improving touch-control performance in ultra-thin stack structures.
Implementation Method 1
surfaces of the first touch-control branches opposite to the second touch-control branches are wave-shaped surfaces; and/or surfaces of the second touch-control branches opposite to the first touch-control branches are wave-shaped surfaces
Data Source
AI summary
A touch-control panel and a touch-control display apparatus. The touch-control panel comprises a touch-control sensing layer with a plurality of touch-control units, wherein each of the touch-control units comprises at least one touch-control pattern, with the touch-control pattern comprising a first touch-control electrode and a second touch-control electrode that are insulated from each other. The first touch-control electrode is provided with at least one first touch-control group, with the first touch-control group comprising a plurality of first touch-control branches and first conductive connection portions which are separately connected to one end of each of the plurality of first touch-control branches. The second touch-control electrode is provided with at least one second touch-control group, with the second touch-control group comprising a plurality of second touch-control branches and second conductive connection portions which are separately connected to one end of each of the plurality of second touch-control branches.