Touch Display Driving Circuit for Force Sensing
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Solution Overview
Problem
Current touch input processing technologies can only sense the position of a user's touch and perform relevant input processing, limiting their ability to provide diverse functions and meet varied user demands, as they do not account for touch force or pressure.
Innovation Solution
A touch display device and driving circuit that simultaneously or separately sense touch position and touch force by using multiple first electrodes embedded in a display panel and a second electrode positioned outside, with a variable touch force sensing gap between them, allowing for the differentiation between soft and force touches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If only touch position sensing is implemented, then the device structure remains simple, but the functionality and user interaction capabilities are limited
Solution Approach 1:
The patent merges touch position sensing and touch force sensing into a single integrated sensing system. The first electrodes embedded in the display panel serve dual purposes: detecting touch position through capacitance changes and detecting touch force through the same electrodes. This consolidation achieves enhanced functionality without proportionally increasing device complexity
Solution Approach 2:
The first electrodes are designed to perform multiple functions: they serve as both touch position detection elements and touch force sensing elements. By making the electrodes universal, the system can distinguish between soft touches and force touches while maintaining a relatively simple structure, thus improving adaptability without excessive complexity
2Measurement precision
If separate sensing periods are used for touch position and touch force, then measurement accuracy improves, but response time increases
Solution Approach 1:
The patent employs periodic sensing cycles that alternate between touch position sensing periods and touch force sensing periods. During each frame period, the system sequentially performs position sensing and force sensing operations. This periodic approach allows adequate time for accurate measurements of both parameters while maintaining a responsive overall system through the structured timing
3Loss of time
If simultaneous sensing of touch position and touch force is implemented, then response time decreases, but measurement precision may be compromised
Solution Approach 1:
The system performs preliminary actions by pre-charging capacitors and preparing sensing circuits during non-sensing periods. Before the actual simultaneous sensing begins, the system ensures that all measurement components are ready and calibrated, which helps maintain measurement precision even when position and force are sensed simultaneously or in rapid succession
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 provision of various functions by accurately sensing touch force, enhancing user interaction with touch displays by distinguishing between different touch forces, thereby improving user experience and functionality.
Implementation Method 1
a capacitor is formed between the multiple first electrodes and the second electrode
Implementation Method 2
the touch force sensing gap is variable according to a touch force of a touch applied to the display panel
Data Source
AI summary
The present embodiments relate to a touch technology and, more particularly, to a touch display device, which includes multiple first electrodes embedded in a display panel, at least one second electrode positioned outside the display panel, and a touch force sensing gap existing between the multiple first electrodes and the at least one second electrode, a method for driving the same, and a driving circuit for driving the multiple first electrodes and the at least one second electrode. The present embodiments, as described above, make it possible to sense not only a touch position, but also a touch force, with which the user presses the screen during a touch.