Touch Display Apparatus Simultaneous Position Pressure Sensing
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Solution Overview
Problem
Touch screen panels struggle to accurately sense the pressure of touch actions due to limitations in existing technologies.
Innovation Solution
A touch display apparatus is designed with a structure that includes a display unit, a touch unit, and conductive layers forming position and force sensing capacitors, allowing simultaneous detection of touch position and pressure by altering capacitance through deformable insulating layers and transparent conductive materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a touch screen panel incorporates only basic touch sensing capabilities, then the device complexity is reduced and ease of manufacture is improved, but the measurement precision of touch pressure is insufficient
Solution Approach 1:
The patent combines position sensing and pressure sensing functions into a single integrated touch display structure. The first and second conductive layers are formed within the same device architecture, allowing simultaneous detection of both touch position and pressure without requiring separate sensing systems, thus improving measurement precision while controlling device complexity
Solution Approach 2:
The conductive layers serve multiple functions: they act as both position sensing electrodes and pressure sensing electrodes. The same structural elements (conductive layers and insulating layers) are used for dual purposes, enabling the touch display to perform both position detection and pressure detection with a unified structure
2Measurement precision
If separate sensing mechanisms are used for position and pressure detection, then measurement precision for both parameters is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges position sensing and pressure sensing into a single integrated capacitor structure. The first conductive layer, second conductive layer, and insulating layer between them form capacitors that simultaneously provide both position and pressure sensing capabilities, eliminating the need for separate sensing mechanisms and simplifying the manufacturing process
Solution Approach 2:
The sensing capacitors formed by the conductive layers and insulating layers serve dual functions: detecting touch position through capacitance changes and detecting touch pressure through capacitance changes. This multi-functional design allows both parameters to be measured with high precision using the same structural elements
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 accurate and simultaneous sensing of touch position and pressure, enhancing the touch functionality of the display apparatus.
Implementation Method 1
a distance D between the first conductive layer 31 and the second conductive layer 34, which serves as a predetermined distance when there is no touch operation on the touch display apparatus 100
Implementation Method 2
forming a force sensing capacitor C with the first conductive layer 31 and the second conductive layer 34
Data Source
AI summary
A touch display apparatus a display unit and a touch unit. The display unit displays images and the touch unit which is overlapped on the display unit can sense independently a touch action applied on the touch unit and also the pressure applied in such touch. The touch display apparatus virtually simultaneously operates under a display period and a touch period in one frame for improving accuracy of determining the aspects of a touch function.