Touch Sensing Device Signal Selection and Differential Amplification
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Solution Overview
Problem
Existing touch display devices face challenges in accurately determining touch signals and positioning due to limitations in comparing signals from sensing lines, which affects the precision and reliability of touch input interfaces.
Innovation Solution
A sensing device comprising a selector, a sensing module, and a detection module that selects and compares touch signals using differential amplifiers and control signals to generate averaged and reference values, enabling precise determination of touch positions through a touch sensing system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal comparison is performed using existing sensing lines, then touch position can be determined, but measurement precision and reliability are insufficient
Solution Approach 1:
The sensing device is divided into multiple sensing lines (first sensing line, second sensing line, third sensing line) that are segmented and arranged in specific directions. Each sensing line independently contributes to touch signal detection, allowing for more precise and reliable position determination through distributed measurement points.
Solution Approach 2:
Different sensing lines are configured with different orientations and functions: the first sensing line extends in a first direction, the second sensing line extends in a second direction intersecting the first, and the third sensing line extends in a third direction intersecting both. This local quality differentiation enables multi-directional touch detection with enhanced precision and reliability for determining touch positions.
2Measurement precision
If multiple sensing lines are used to improve precision, then touch position accuracy improves, but device complexity increases
Solution Approach 1:
Multiple sensing lines extending in different directions are merged into a single integrated sensing device structure. The first, second, and third sensing lines are combined within one device, allowing simultaneous multi-directional touch detection without requiring separate devices for each sensing direction, thus improving precision while managing complexity.
Solution Approach 2:
The sensing device is designed with multi-functionality by incorporating sensing lines in multiple directions (first direction, second direction, third direction) within a single device. This universal design allows the device to detect touches from various orientations and positions, enhancing measurement precision while avoiding the need for multiple separate sensing devices.
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 enhances the accuracy and reliability of touch signal detection, allowing for precise determination of touch positions and improving the overall performance of touch sensing systems in display devices.
Implementation Method 1
a first differential amplifier for comparing the selected touch signals and producing a first differential signal according to first control signals
Implementation Method 2
generating an averaged sensing value and a reference value from the first differential signal, and comparing the averaged sensing value with the reference value to produce a second differential signal
Data Source
AI summary
A sensing device placed in a touch sensing system of a display device includes a selector, a sensing module, and a detection module for determining touch signals generated by the touch sensing system. The selector selects two of the touch signals according to at least one selection control signal. The sensing module comprises a first differential amplifier for comparing the selected touch signals and producing a first differential signal according to first control signals. According to second control signals, the detection module receives the first differential signal, generates an averaged sensing value and a reference value, and compares the averaged sensing value with the reference value to produce a second differential signal. Thereby, the touch sensing system uses the second differential signal to generate the first control signals and the second control signals to control the operation of the touch sensing system.