Touch Display Panel Force Touch Detection via Electrode Deformation
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Solution Overview
Problem
Existing Force Touch technologies increase production costs and occupy additional assembling space in touch display panels, as they require additional sensors or sensing layers for pressure detection.
Innovation Solution
A touch display panel with insulated and crossing driving and sensing electrodes, along with a scanning signal transmitting unit, first and second touch detection units, and a coordinate combination unit, which determines X, Y, and Z coordinates of a touch position without occupying additional space or increasing costs, by using a time-sharing method to apply scanning signals and collect signals through these electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional pressure sensors or sensing layers are added to achieve Force Touch, then Force Touch functionality is improved, but production cost increases and assembling space is occupied
Solution Approach 1:
The existing driving electrodes and sensing electrodes in the touch display panel are made to serve dual functions: traditional touch detection (X, Y coordinates) and Force Touch detection (Z coordinate/pressure). By applying scanning signals to these existing electrodes and analyzing the collected signals, the system achieves pressure detection without adding separate sensing layers or components, thus implementing multi-functionality with existing structures.
Solution Approach 2:
The driving electrodes and sensing electrodes serve themselves by performing both their original touch detection function and the new Force Touch detection function. The electrodes utilize their own structural deformation under pressure to generate detectable signal changes, eliminating the need for dedicated pressure sensing components and reducing overall system complexity.
2Measurement precision
If additional sensors are added for pressure detection, then Force Touch detection precision is improved, but device complexity increases
Solution Approach 1:
The existing electrode structures are designed to perform multiple detection functions simultaneously. The same driving electrodes and sensing electrodes that detect touch position (X, Y) also detect pressure (Z) by measuring signal changes caused by their deformation under pressure, thereby achieving precise multi-dimensional detection without increasing component count.
Solution Approach 2:
The system detects pressure by monitoring changes in electrical signal parameters (capacitance, impedance, or voltage) of the existing electrodes. When pressure is applied, the electrodes deform, causing measurable changes in their electrical characteristics. By analyzing these parameter changes, the system achieves precise pressure detection using the same components for position detection.
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 Force Touch functionality without additional sensors or sensing layers, reducing production costs and maintaining the original panel structure, allowing for accurate and intuitive three-dimensional touch position determination.
Implementation Method 1
the capacitive pressure detection mainly detects the deformation
Data Source
AI summary
A touch display panel, a driving method thereof and a display device. The touch display panel includes a plurality of driving electrodes and a plurality of sensing electrodes, a scanning signal transmitting unit, a first touch detection unit and a second touch detection unit; the scanning signal transmitting unit is configured to send scanning signals to the driving electrodes during the touch stage; the first touch detection unit is configured to collect signals through the sensing electrodes and determine an X coordinate and a Y coordinate of the touch position during a first preset period of time; the second touch detection unit is configured to collect signals through the driving electrodes and determine a Z coordinate of the touch position during a second preset period of time; and the first preset period of time and the second preset period of time are periods of time of the touch stage.