Antistatic Layer Enables Force Touch Sensing in Display Panels
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Solution Overview
Problem
Existing touch display panels lack the capability to sense force applied by users, limiting the range of touch operations that can be performed.
Innovation Solution
Incorporating an antistatic layer inside the touch display panel, which forms a capacitive force sensor when applied with a force scanning signal, allowing the panel to detect changes in capacitance and determine the applied force without requiring a new electrode layer, thus enabling force touch functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a new electrode layer is added to enable force touch sensing, then the force sensing capability is improved, but the panel thickness and structural complexity increase
Solution Approach 1:
The antistatic layer, originally designed solely for static electricity dissipation, is repurposed to serve dual functions: maintaining its electrostatic protection role while simultaneously acting as one electrode of a capacitive sensor to enable force touch sensing. This eliminates the need for adding a separate electrode layer for force sensing.
Solution Approach 2:
The existing antistatic layer serves itself by performing both its original function (electrostatic dissipation) and a new function (force sensing electrode). The layer's inherent electrical properties allow it to participate in capacitive sensing without requiring external modification or additional components.
2Measurement precision
If the antistatic layer resistivity is increased to improve force sensing accuracy, then the sensing precision is improved, but the static electricity dissipation capability deteriorates
Solution Approach 1:
The antistatic layer resistivity is optimized to a specific range (10^8 to 10^10 ohms) that balances two competing requirements: high enough resistivity to generate sufficient capacitance change signal for accurate force sensing, yet low enough to maintain effective static electricity dissipation. This parameter optimization resolves the contradiction between sensing precision and electrostatic protection.
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
Enables the touch display panel to accurately detect force applied by users, enhancing the range of touch operations without increasing the panel's thickness or adding new layers, and ensuring effective signal transmission through the antistatic layer.
Implementation Method 1
the antistatic layer and the touch electrode are capable of forming a capacitive force sensor in the case that the antistatic layer is applied with a force scanning signal
Data Source
AI summary
A touch display panel, a touch display device and a driving method are provided. The touch display panel includes an array substrate, an opposite substrate arranged opposite to the array substrate, a touch electrode arranged at a side of the array substrate facing the opposite substrate, and an antistatic layer arranged inside the touch display panel. The antistatic layer is located at a side of the opposite substrate facing the touch electrode, and the antistatic layer and the touch electrode are capable of forming a capacitive force sensor in the case that the antistatic layer is applied with a force scanning signal.