Touch Chip Signal Ratio Detection for Stylus Erase Recognition
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Solution Overview
Problem
Existing touch technologies struggle to accurately differentiate between writing and erasing functions using a stylus on a touch panel, leading to potential misjudgments and inefficiencies.
Innovation Solution
A touch chip and system that utilize a receiver circuit and processor circuit to analyze signal intensities and ratios from multiple electrodes on a stylus to determine the intended function, enabling precise differentiation between writing and erasing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal intensity threshold comparison is used to differentiate writing and erasing functions, then function identification accuracy is improved, but device complexity increases due to multiple threshold values and signal intensity ratio calculations
Solution Approach 1:
The patent applies parameter changes by comparing signal intensity ratios (second signal intensity divided by first signal intensity) against threshold values to differentiate between writing and erasing functions. The processor circuit calculates the ratio of signal intensities from different electrodes and compares this derived parameter against predetermined thresholds, enabling accurate function identification through mathematical transformation of raw signal data.
Solution Approach 2:
The patent introduces an intermediary calculation step by computing the signal intensity ratio as an intermediate parameter between raw electrode signals and final function determination. This ratio serves as a mediator that transforms complex multi-electrode signal patterns into a simplified comparative value that can be evaluated against thresholds, reducing the complexity of direct multi-parameter analysis.
2Measurement precision
If multiple electrodes and signal analysis circuits are added to differentiate functions, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies universality by designing the receiver circuit and processor circuit to handle multiple signal sources (first electrode and second electrode) and perform multiple functions (signal reception, intensity calculation, ratio computation, and function determination) using a unified integrated circuit architecture. This multi-functional design eliminates the need for separate dedicated circuits for each function, reducing overall manufacturing complexity and cost while maintaining high measurement precision.
3Reliability
If signal intensity ratio calculation is implemented, then function determination reliability is improved, but processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing threshold values during the design and manufacturing phase. These predetermined thresholds are embedded in the processor circuit, eliminating the need for real-time complex calculations during operation. The system performs preliminary setup of decision criteria, allowing rapid real-time function determination through simple ratio comparisons against pre-established thresholds.
Data Source
AI summary
A touch chip is to receive a first signal and a second signal from a stylus and includes a receiver circuit and a processor circuit. The receiver circuit is to receive the first signal and the second signal. The processor circuit is coupled to the receiver circuit and is to perform operations below: determining whether a signal intensity of the received first signal is greater than a first threshold value; determining whether a second signal is received when the signal intensity of the received first signal is greater than the first threshold value; determining whether a signal intensity ratio of the second signal to the first signal is greater than a second threshold value to generate a determination result when it is determined that the second signal is received; and performing an erase function according to the determination result.