Touch Sensing Device Variable Capacitor Potential Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional touch sensing devices have a large circuit layout area due to numerous capacitors required, leading to increased size and manufacturing costs, and lack flexibility in sensitivity adjustment for varying practical situations or user conditions.
Innovation Solution
A touch sensing device incorporating a touch sensing trace layout, a comparator, and a variable capacitor unit that can be selectively coupled to the comparator inputs to perform potential compensation, allowing for flexible sensitivity adjustment and reduced capacitor usage, thereby minimizing the circuit layout area and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If many capacitors are used for touch sensing operation, then the sensing operation can be performed, but the circuit layout area becomes significantly large
Solution Approach 1:
The patent merges the capacitor functionality into a shared resource that is time-multiplexed across multiple sensing operations. Instead of having dedicated capacitors for each sensing operation, a single capacitor is reused sequentially for different trace groups, thereby reducing the total capacitor count and circuit layout area while maintaining touch sensing capability.
Solution Approach 2:
The patent implements dynamic switching of capacitor connections through control signals that selectively couple the shared capacitor to different comparator inputs based on the current sensing operation. This dynamic reconfiguration allows one capacitor to serve multiple sensing traces at different time intervals, reducing the static circuit layout area requirement.
2Device complexity
If the circuit layout of capacitors is fixed, then the device structure is simplified, but the sensitivity cannot be flexibly adjusted
Solution Approach 1:
The patent introduces dynamic control mechanisms that allow the fixed circuit layout to be reconfigured during operation. Control signals dynamically adjust the coupling between the shared capacitor and different comparator inputs, enabling sensitivity adjustment for different trace groups without changing the physical circuit layout structure.
Solution Approach 2:
The patent changes operational parameters (capacitor coupling state, switching timing) rather than physical structure to achieve sensitivity adjustment. By modifying which capacitor is coupled to which comparator input based on control signals, the system adapts its sensitivity characteristics while maintaining a fixed physical circuit layout.
3Reliability
If many capacitors are used for touch sensing operation, then the sensing operation can be performed, but the manufacturing cost increases
Solution Approach 1:
The patent merges multiple capacitor functions into a single shared capacitor that is time-multiplexed across different sensing operations. This reduction in component count directly lowers manufacturing costs while maintaining the necessary touch sensing functionality through intelligent resource sharing and control signal management.
Solution Approach 2:
The shared capacitor is designed to perform multiple functions by being selectively coupled to different comparator inputs for different trace groups. This multi-functionality eliminates the need for multiple dedicated capacitors, reducing component count and manufacturing cost while maintaining full touch sensing capability across all traces.
Data Source
AI summary
A touch sensing device includes a touch sensing trace layout, a comparator and a variable capacitor unit. The touch sensing trace layout performs a sensing operation according to at least one first driving signal in a sensing state. An input of the comparator is electrically coupled to the touch sensing trace layout for receiving a sensing signal outputted by the touch sensing trace layout. The variable capacitor unit is selectively coupled to one of the inputs of the comparator, for correspondingly performing potential compensation to the sensing signal received by the input of the comparator according to at least one second driving signal.