Capacitive Display Electrode Scanning for Boundary Resolution
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Solution Overview
Problem
Electrostatic capacitive touch panels face reduced detection sensitivity and position resolution when an input tool approaches the boundary or end portions of drive ranges, leading to inaccurate input position detection.
Innovation Solution
The display employs a configuration with driving electrodes extending in one direction and detection electrodes in a perpendicular direction, where the driving unit supplies signals to specific electrodes at the end and central portions of arrays, and repeats scanning operations by shifting selected electrodes, ensuring equal signal intensities and overlapping drive ranges to enhance detection sensitivity and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If driving electrodes are arranged in arrays with non-overlapping drive ranges, then the scanning operation can cover the entire display area, but the detection sensitivity and position resolution are reduced at boundary portions of drive ranges
Solution Approach 1:
The display area is divided into multiple drive ranges, each scanned by a specific group of driving electrodes. This segmentation allows systematic coverage of the entire area while managing the complexity of touch detection across different regions.
Solution Approach 2:
Different scanning strategies are applied to different regions: central portions use standard scanning, while boundary portions and end portions use enhanced scanning with overlapping drive ranges and additional scanning operations to maintain high detection sensitivity and position resolution throughout the entire display area.
2Device complexity
If driving electrodes at end portions are included in fewer scanning operations, then the scanning complexity is reduced, but the detection sensitivity and position resolution are reduced at end portions
Solution Approach 1:
The system performs preliminary scanning operations on boundary and end portions before completing the full scanning sequence. This ensures that regions with fewer scanning operations still accumulate sufficient detection data through pre-scan enrichment, maintaining position resolution without significantly increasing overall complexity.
Solution Approach 2:
Multiple periodic scanning cycles are implemented, with certain driving electrodes being scanned repeatedly across different cycles. This periodic repetition ensures that even electrodes at end portions participate in multiple detection opportunities, improving position resolution while managing complexity through regular patterns.
3Measurement precision
If the number of scanning operations is increased to improve position resolution, then the detection sensitivity improves, but the scanning time and processing load increase
Solution Approach 1:
The system performs a baseline number of scanning operations across the entire display area, then adds partial additional scanning operations specifically for boundary and end portions. This excessive action is applied selectively only where needed, improving position resolution at critical regions without proportionally increasing the scanning time for the entire display area.
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 improves detection sensitivity and position resolution at boundary and end portions of drive ranges, providing more accurate input position detection even with thin stylus pens or gloved fingers, by maintaining strong detection signal intensities and correcting for signal shifts.
Implementation Method 1
the electrostatic capacitance method... the input positions are detected by utilizing the characteristics that the electrostatic capacitance of capacitive elements changes when performing input operations by contacting the capacitive elements with a finger or an input tool
Data Source
AI summary
It is an object of the present invention to provide a display capable of improving the detection sensitivity and position resolution even when an input tool has contacted or approached boundary portions of drive ranges or end portions of the display region. The driving electrode driver performs scanning operations for supplying driving signals to one driving electrode or N1 (N1≥2) number of driving electrodes disposed at an end portion on one side of an array. Next, the driving electrode driver repeats scanning operations for supplying the driving signals to the selected N2 (N2≥2) number of driving electrodes a plurality of times by shifting each of the selected N2 number of driving electrodes N3 number by N3 number. N3 is less than N2.