Segmented Touch Panel Control Circuits for Power Saving
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Solution Overview
Problem
Portable electronic devices with large touch panels face high power consumption during touch detection due to the need for frequent scans, which shortens their standby time.
Innovation Solution
A touch device with a touch panel divided into multiple areas, each controlled by independent control circuits that can operate in normal or power-saving modes, allowing for flexible scanning frequencies and densities to reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single control circuit performs touch detection on the entire large touch panel at high frequency, then real-time touch response is achieved, but power consumption increases significantly
Solution Approach 1:
The touch panel is divided into multiple independent touch areas, each controlled by a separate control circuit. This segmentation allows different regions to operate independently at different scanning frequencies, enabling frequently touched areas to maintain high response speed while less active areas consume less power, thus resolving the contradiction between real-time response and power consumption.
Solution Approach 2:
The control circuits are configured with adjustable scanning frequencies that can dynamically adapt to different operational states. By adjusting the scanning frequency of each control circuit based on touch activity patterns, the system maintains real-time responsiveness when needed while reducing power consumption during idle periods, effectively balancing response speed and energy usage.
2Measurement precision
If the scanning frequency is increased to achieve real-time touch detection, then touch response accuracy is improved, but power consumption increases
Solution Approach 1:
Different touch areas are assigned different scanning frequencies based on their specific requirements. Frequently touched areas maintain high scanning frequencies for accurate real-time detection, while less active areas use lower scanning frequencies to reduce power consumption. This localized quality adjustment resolves the contradiction by applying high measurement precision only where necessary.
3Device complexity
If a single control circuit controls the entire touch panel, then device structure is simple, but power consumption is high
Solution Approach 1:
The control circuit system is segmented into multiple independent control circuits, each managing a specific touch area. This segmentation increases structural complexity but enables independent power management for each region, allowing the system to reduce overall power consumption by activating only the necessary control circuits based on touch activity patterns.
Solution Approach 2:
Each control circuit is designed with multi-functionality, capable of operating at different scanning frequencies and modes. This universality allows the control circuits to adapt to different operational requirements, maintaining simplicity in individual circuit design while achieving complex power management through their coordinated operation.
Data Source
AI summary
A touch device is provided. The touch device includes a touch panel, a first control circuit, and a second control circuit. The touch panel is divided into a first touch area and a second touch area. The first control circuit is coupled to the first touch area and performs a first touch-detection operation on the first touch area. The second control circuit is coupled to the second touch area and performs a second touch-detection operation on the second touch area.