Pressure-Sensing Key Circuit With Regional Resistance Grouping
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Solution Overview
Problem
Existing keyboards face challenges in measurement accuracy due to large differences in force-resistance change curves among keys connected to the same induction line, requiring a large measurement range that affects accuracy.
Innovation Solution
A key circuit is designed where keys are divided into regions based on parameters affecting force and resistance response, ensuring that resistance values of keys in each region change within a small range when pressed, and all keys in a region are connected to the same induction line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If keys are connected to induction lines based on layout and wiring convenience, then the circuit layout is simplified, but the force-resistance change curve span increases and measurement accuracy decreases
Solution Approach 1:
The patent segments keys into different groups based on their force-resistance characteristics. Keys with similar resistance change ranges are assigned to the same induction line, while keys with different characteristics are assigned to different induction lines. This segmentation allows each induction line to be optimized for a specific resistance range, improving measurement accuracy without compromising layout simplicity.
Solution Approach 2:
The patent applies local quality by assigning different measurement ranges and characteristics to different induction lines based on the specific requirements of the keys they serve. Each induction line is tailored to handle keys with similar force-resistance profiles, allowing for optimized measurement accuracy for each local group of keys rather than using a uniform approach for all keys.
2Adaptability or versatility
If a large measurement range is used to accommodate all keys on the same induction line, then all keys can be monitored, but measurement accuracy decreases
Solution Approach 1:
The patent divides the key monitoring system into multiple segments, each handled by a dedicated induction line with an optimized measurement range. Instead of using one large measurement range for all keys, the system segments keys into groups and assigns each group to an induction line with a tailored measurement range, thereby maintaining high accuracy while covering all keys across multiple segments.
Solution Approach 2:
The patent implements dynamic adaptation by allowing different induction lines to operate with different measurement ranges based on the specific characteristics of the keys they monitor. The control module dynamically selects the appropriate induction line and measurement range based on which key is being pressed, optimizing accuracy for each specific measurement scenario.
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 improves measurement accuracy by limiting the resistance change range within each region, allowing for precise control of keys to implement different functions based on pressure detection, thus expanding the application scenarios of the keyboard.
Implementation Method 1
When a key is pressed down, an upper-layer key contacts a lower-layer keyboard film through the pressure sensor, so as to activate circuit signal conduction. When the key is in conduction, a key resistance will change with pressure
Data Source
AI summary
The present application provides a key circuit, wherein the circuit includes: a plurality of keys, a plurality of driving lines, a plurality of induction lines and a control module, wherein the plurality of keys are divided into a plurality of regions according to parameters affecting force and resistance response, and resistance of the keys in each region changes with pressure within the same range; each key is connected to one driving line and one induction line, and keys in the same region are connected to the same induction line; and the plurality of driving lines and the plurality of induction lines are all connected to I/O interfaces of the control module, and are configured to transmit acquired resistance information of corresponding keys to the control module, so as to output control information corresponding to the keys via the control module.