Switching Units for Touch Sensing Accuracy
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Solution Overview
Problem
The existing electronic apparatuses with touch sensing functions face issues due to varying equivalent capacitance values or load values caused by capacitance effects or load effects, which affect the accuracy of touch sensing results.
Innovation Solution
The electronic apparatus includes a substrate with scan lines and first switching units, where each scan line is coupled to a driver device through one of the first switching units. During the touch sensing period, the first switching units are controlled to be in a non-conducting state, reducing the capacitance effect and maintaining high impedance states at the connection points between the scan lines and the driver device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the driver device is coupled to the scan line during touch sensing, then the scan line can be driven to perform scanning function, but the capacitance effect causes varying equivalent capacitance values that affect touch sensing accuracy
Solution Approach 1:
The patent extracts the harmful capacitance effect by introducing a switching unit that disconnects the scan line from the driver device during touch sensing operations. This separation removes the source of varying equivalent capacitance values, allowing accurate touch sensing without the interference of the driver device's capacitance.
Solution Approach 2:
The patent implements dynamic control of the switching unit based on the operational phase. During display scanning, the switching unit connects the scan line to the driver device for normal operation. During touch sensing, the switching unit disconnects them to eliminate capacitance effects. This dynamic switching resolves the contradiction between needing connection for scanning and disconnection for accurate sensing.
2Productivity
If the driver device scans the electronic apparatus, then display and scanning functions are achieved, but load effects cause different load values that affect touch sensing results
Solution Approach 1:
The patent extracts the load effect by disconnecting the scan line from the driver device during touch sensing through the switching unit. This removes the variable load values introduced by the driver device, enabling precise touch sensing measurements without the interference of scanning operations.
Solution Approach 2:
The patent implements periodic switching between scanning mode and sensing mode. The switching unit alternates between connecting and disconnecting the scan line based on the current operation phase. This periodic action allows the system to achieve both efficient scanning and accurate touch sensing at different time intervals.
3Duration of action of stationary object
If the scan line is continuously connected to the driver device, then scanning operations can proceed without interruption, but capacitance and load effects continuously interfere with touch sensing
Solution Approach 1:
The patent employs periodic switching control where the switching unit connects the scan line to the driver device during scanning phases and disconnects during sensing phases. This periodic action maintains continuous overall operation while periodically eliminating capacitance and load effects during critical sensing moments, resolving the contradiction between continuous operation and measurement accuracy.
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
This configuration reduces the capacitance effect and load effect during the touch sensing period, thereby improving the accuracy and reliability of the touch sensing results in electronic apparatuses.
Implementation Method 1
the driver device coupled to the scan line may experience different equivalent capacitance values or load values due to capacitance effects or load effects
Data Source
AI summary
An electronic apparatus includes a substrate, a plurality of scan lines, and a plurality of first switching units. The plurality of scan lines are disposed on the substrate. The plurality of first switching units are disposed on the substrate. Each scan line is coupled to the driver device through one of the plurality of first switching units.