Capacitance Detection Sensitivity in Large Coordinate Positioning
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Solution Overview
Problem
Existing coordinate position detection apparatuses suffer from insufficient sensitivity, particularly when dealing with larger operation surfaces that require scanning multiple coordinate detection electrodes successively.
Innovation Solution
A coordinate position detection apparatus is designed with a configuration that includes first and second sensor electrodes connected to capacitance detectors with integration circuits, a coordinate computing unit, and a selector switch, allowing for simultaneous detection of capacitances by multiple detectors during a unit detection period, thereby reducing detection time and enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coordinate detection electrodes are scanned successively, then device complexity is reduced, but measurement precision deteriorates due to insufficient sensitivity in larger operation surfaces
Solution Approach 1:
The detection system is segmented into multiple independent capacitance detectors, each responsible for detecting signals from specific sensor electrodes simultaneously. This segmentation allows parallel detection across the operation surface, improving sensitivity without requiring a single complex scanning system.
Solution Approach 2:
The patent transitions from sequential one-dimensional scanning to simultaneous two-dimensional parallel detection by arranging multiple capacitance detectors in a matrix configuration that matches the sensor electrode layout, enabling comprehensive coverage of the operation surface at once.
2Measurement precision
If multiple capacitance detectors are used for simultaneous detection, then measurement precision improves, but device complexity increases
Solution Approach 1:
Multiple capacitance detectors are merged into a coordinated detection system where each detector processes signals from specific sensor electrodes simultaneously. The integration of these detectors with the sensor electrode array creates a unified detection architecture that achieves high sensitivity while managing complexity through systematic organization.
Solution Approach 2:
The capacitance detectors are designed with multi-functionality to handle various detection tasks simultaneously, including measuring capacitance changes from different sensor electrodes and processing signals from multiple coordinate pointing devices, thereby reducing the need for separate specialized components.
3Area of stationary object
If scanning is performed successively on larger operation surfaces, then area coverage is improved, but loss of time increases due to extended detection period
Solution Approach 1:
The detection system maintains continuous useful action by performing simultaneous capacitance measurements across all sensor electrodes through multiple parallel detectors, eliminating the idle time associated with sequential scanning and ensuring that the entire operation surface is detected within a single detection cycle.
Solution Approach 2:
The system prepares for comprehensive area coverage by pre-positioning multiple capacitance detectors across the operation surface in a configuration that enables simultaneous detection of all regions, eliminating the need for time-consuming sequential movement or scanning operations.
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 provides sufficient sensitivity even for larger devices by allowing multiple electrodes to be detected simultaneously, reducing the time required for capacitance detection and improving accuracy.
Implementation Method 1
the plurality of first and second capacitance detectors perform integration during a unit detection period to measure capacitances
Data Source
AI summary
A configuration of a coordinate position detection apparatus is provided that provides a sufficient sensitivity even in the case of a larger device. A coordinate position detection apparatus (100) includes: a first sensor electrode (Xi); a first capacitance detector (21) connected with the first sensor electrode (Xi) and including an integration circuit; a second sensor electrode (Yj); a second capacitance detector (22) connected with the second sensor electrode (Yj) and including an integration circuit; a coordinate computing unit (25); and a coordinate pointing device (30). In this coordinate position detection apparatus (100), when it is in a first input mode where the coordinate pointing device (30) inputs a coordinate position, a plurality of first and second capacitance detectors (21) and (22) are configured to detect a signal provided by the coordinate pointing device (30), and the coordinate pointing device (30) performs charging and the plurality of first and second capacitance detectors (21) and (22) perform integration during a unit detection period to measure capacitances. Based on the capacitances, the coordinate computing unit (25) determines the coordinate position.