Touch Screen State Control via Capacitance Node Analysis
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Solution Overview
Problem
Existing touch screen technologies require complex detection circuits and additional electric field elements in covers, leading to increased costs and operational complexity for controlling the state of touch screens.
Innovation Solution
A method and system for controlling a touch screen state by detecting uniform changes in capacitance values across multiple touch nodes within a preset region, allowing for state switching without the need for a complex detection circuit, using a touch sensor with multiple nodes and a control module to determine when capacitance changes exceed a threshold, enabling simple and cost-effective operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a Hall effect sensor and magnetic field detection circuit are used to control touch screen state, then the touch screen can be controlled to switch states, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the state detection function from a separate magnetic field detection circuit and integrates it into the existing touch sensor system. The touch sensor's capacitance detection capability is utilized to detect both touch operations and cover proximity, eliminating the need for a separate Hall effect sensor and magnetic field detection circuit.
Solution Approach 2:
The touch sensor is designed to perform multiple functions: detecting actual touch operations on the screen and detecting the proximity of the cover. By making the touch sensor multi-functional, the patent eliminates the need for separate detection circuits, reducing device complexity while maintaining ease of operation.
2Ease of operation
If a Hall effect sensor and magnetic field detection circuit are used to control touch screen state, then the touch screen can be controlled to switch states, but the manufacturing cost increases
Solution Approach 1:
The patent removes the expensive Hall effect sensor and magnetic field detection circuit from the system, extracting only the necessary detection capability from the existing touch sensor. This significantly reduces component costs and simplifies the manufacturing process.
Solution Approach 2:
By designing the touch sensor to serve dual purposes (touch detection and cover proximity detection), the patent eliminates the need for additional expensive components, thereby reducing manufacturing costs while maintaining full functionality.
3Measurement precision
If capacitance values of multiple touch nodes are detected and analyzed, then accurate state control is achieved, but the detection and measurement complexity increases
Solution Approach 1:
The patent divides the touch sensor into multiple touch nodes arranged in a matrix. Each node independently detects capacitance changes, and the controller analyzes the collective data from multiple nodes to determine cover proximity. This segmentation approach maintains measurement precision while simplifying the detection process through distributed sensing.
Solution Approach 2:
The patent detects capacitance changes from multiple touch nodes (excessive action) to ensure accurate detection of cover proximity. By using more detection points than strictly necessary, the system achieves robust and precise state control, compensating for the increased measurement complexity through redundancy.
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 approach simplifies the operation of touch screens by controlling state switching based on capacitance changes, reducing costs by eliminating the need for complex detection circuits and enhancing user experience through convenient operation.
Implementation Method 1
identifying a touch state according to a small change in capacitance that occurs when a human body (or another object) approaches a detection electrode and changes the original electric field
Data Source
AI summary
A method for controlling a state of a touch screen is provided. The touch screen includes a touch sensor and the touch sensor includes multiple touch nodes, the control method including the following steps: S1. detecting that detected capacitance values of touch nodes in a preset particular region on the touch sensor uniformly change within a preset time length; S2. obtaining a quantity of touch nodes whose change in the detected capacitance value is greater than a preset detected capacitance threshold value; and S3. when the quantity of touch nodes whose change in the detected capacitance value is greater than the preset detected capacitance threshold value is greater than a preset quantity, controlling the touch screen to perform state switching. The control method is simple and convenient and does not require any complex detection circuit. A touch screen and a portable touch terminal having the touch screen are also provided.