Unified Touch Panel Controller for Display and Button Regions
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Solution Overview
Problem
The use of separate touch panel controllers for display and button regions in touch panel display devices increases costs and is affected by differences in detection characteristics and electrical characteristics between the panel and switch, leading to adverse effects on touch detection.
Innovation Solution
A common touch panel controller is used for both display and button regions, with a control circuit capable of switching detection characteristics and individual detection circuits for each region, allowing for shared driving circuits and separate detection parameters to be set, thereby reducing costs and minimizing adverse effects on touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate touch panel controllers are used for display and button regions, then detection precision for each region can be optimized, but device complexity and cost increase
Solution Approach 1:
The patent implements a universal touch panel controller that can handle both display region touch detection and button region touch detection through a unified architecture. The controller uses common driving circuits and detection circuits that are configured to accommodate different detection requirements (self-capacitance for buttons, mutual capacitance for display) without requiring separate controller units, thereby reducing device complexity while maintaining detection precision through software-based detection parameter switching.
Solution Approach 2:
The patent applies parameter changes by dynamically switching detection parameters within the unified controller based on the active region. The control circuit switches between self-capacitance detection parameters for button regions and mutual capacitance detection parameters for display regions, allowing a single controller to adapt to different detection requirements and achieve optimized precision for each region without increasing hardware complexity.
2Device complexity
If a common touch panel controller is used for display and button regions, then device complexity and cost are reduced, but detection characteristics differences may adversely affect touch detection
Solution Approach 1:
The patent implements dynamic adaptability within the common controller through a control circuit that automatically switches detection parameters based on the active region. The controller dynamically adjusts between self-capacitance and mutual capacitance detection modes, and modifies detection sensitivity, scanning frequency, and threshold parameters according to whether the display region or button region is being detected, ensuring reliable touch detection despite different electrical characteristics.
Solution Approach 2:
The patent applies local quality by implementing region-specific detection parameters within the unified controller architecture. Different detection algorithms, sensitivity levels, and threshold values are applied locally to button regions versus display regions based on their specific electrical characteristics. This allows the common controller to treat each region with optimized parameters appropriate to its local requirements, maintaining detection reliability despite hardware unification.
3Manufacturing precision
If detection parameters are standardized across display and button regions, then manufacturing precision is improved, but detection accuracy for specific regions deteriorates
Solution Approach 1:
The patent resolves this contradiction by implementing parameter changes based on active region. The controller maintains standardized manufacturing through a unified parameter set that can be systematically adjusted, while simultaneously achieving region-specific detection accuracy by switching between self-capacitance parameters for buttons and mutual capacitance parameters for display. The control circuit automatically selects appropriate parameter sets based on the detected region, allowing standardized manufacturing processes to produce controllers that adapt to different regional requirements.
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 reduces the cost of touch panel display devices and ensures that differences in detection characteristics do not impact touch detection, enabling efficient and accurate multi-touch detection across both display and button regions.
Implementation Method 1
the touch panel having intersection capacitances (22) formed in a matrix at intersecting portions of a plurality of first driving electrodes (20) and a plurality of first detection electrodes (21)
Data Source
AI summary
A common touch panel controller is used for performing touch detection by driving both a touch panel superimposed on a display panel of a touch panel display portion for display, and a touch sensor superimposed on a touch key pattern of a touch key input portion for buttons. A control circuit capable of switching detection characteristics of a detection circuit common to the both in accordance with detection from the touch panel display portion and detection from the touch key input portion is adopted in the touch panel controller.