Touch Control Circuit Orientation-Aware Symbol Identification
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Solution Overview
Problem
Current touch-driven electronic devices cannot identify characters written on a touch display screen when the screen orientation differs from the orientation of the written character, limiting the ability to wake up the device for specific applications during sleep mode.
Innovation Solution
A touch driving device with a touch sensing circuit and control circuit that generates digital touch coordinates and identifies matching symbols, even when the input symbol's orientation is not aligned with the screen orientation, allowing for effective touch movement track identification and waking up the device's processing unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch display screen is placed in a non-aligned orientation during sleep mode, then the device cannot identify the written character, but if the device always wakes up for touch input, then power saving cannot be achieved
Solution Approach 1:
The touch control circuit performs preliminary processing of touch input data during sleep mode, including generating touch coordinates and identifying symbols before the main processor wakes up. This preliminary action allows the system to distinguish between valid wake-up triggers and regular touches, enabling power saving while maintaining reliable character identification when needed
Solution Approach 2:
The touch control circuit acts as an intermediary between the touch sensor array and the core processing unit. It processes touch sensing signals and determines whether to wake up the main processor, serving as a mediator that enables power saving while ensuring reliable character recognition through its symbol matching functionality
2Measurement precision
If the device requires character orientation to match screen orientation for identification, then identification accuracy is maintained, but user convenience is reduced
Solution Approach 1:
The touch control circuit dynamically adjusts its symbol matching process based on the detected touch movement track orientation. When the input symbol's orientation does not match the screen orientation, the system can still identify the symbol by comparing it with preconfigured symbols, making the identification process adaptive rather than rigid
Solution Approach 2:
The system changes the parameter of orientation matching from a strict requirement to a flexible comparison. By comparing the touch movement track with preconfigured symbols regardless of orientation mismatch, the system transforms the rigid orientation parameter into a more flexible identification approach that maintains accuracy while improving user convenience
Data Source
AI summary
A touch driving device and a touch movement track identification method are provided. The touch driving device includes a touch sensing circuit and a touch control circuit. The touch sensing circuit receives touch sensing signals from a touch sensor array when a touch display screen is operated in a display power saving mode, and generates digital touch sensing data according to the touch sensing signals. The touch control circuit periodically generates touch coordinates according to the digital touch sensing data, identifies whether an input symbol corresponding to a touch movement track formed by the touch coordinates generated consecutively matches a preconfigured symbol, and outputs a matching result to a core processing unit of the electronic device. The touch coordinates are generated when the orientation of the input symbol drawn on the touch display screen is not the same as a screen orientation of the touch display screen.