Stylus Signal Transmission Using Alternating Frequency Modulation
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Solution Overview
Problem
Existing capacitive stylus technologies face synchronization issues during signal transmission with touch screens, leading to increased detection time and reduced report rates, as well as weak anti-interference abilities due to the need for fault-tolerant time between signal bits.
Innovation Solution
The method involves transmitting coded amplitude modulation signals alternately at two frequencies, allowing for reduced transmission time and detection time on touch screens, thereby enhancing report rates and anti-interference capabilities by ensuring accurate detection within two adjacent time slices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fault-tolerant time is reserved between signal bits to ensure synchronization, then signal transmission reliability is improved, but detection time increases and report rate decreases
Solution Approach 1:
The patent applies periodic action by using two different frequencies (first frequency and second frequency) to transmit coded amplitude modulation signals alternately. Odd-numbered signals are transmitted at the first frequency while even-numbered signals are transmitted at the second frequency, creating a periodic transmission pattern that eliminates the need for fault-tolerant time between bits while maintaining synchronization reliability
Solution Approach 2:
The patent changes the frequency parameter of the transmission signals to resolve the contradiction. By switching between two different frequencies for alternating signals, the system achieves both reliable synchronization and reduced detection time, thereby improving report rate without sacrificing transmission reliability
2Reliability
If fault-tolerant time is reserved between signal bits, then anti-interference ability is improved, but transmission time increases
Solution Approach 1:
The periodic alternation between two frequencies allows the system to maintain strong anti-interference ability through frequency diversity while eliminating idle fault-tolerant time periods. This continuous transmission approach reduces total transmission time while preserving the ability to distinguish and correctly detect individual signals
Solution Approach 2:
By changing the frequency parameter alternately for different signals, the patent achieves both goals: maintaining anti-interference capability through frequency differentiation and reducing transmission time by eliminating gaps between signals
3Productivity
If detection time is reduced to improve report rate, then productivity is improved, but signal detection accuracy may deteriorate
Solution Approach 1:
The periodic use of two frequencies enables the touch screen to detect multiple signals within a shorter time window. The alternating frequency pattern provides clear temporal and spectral separation between signals, allowing accurate detection without requiring extended detection time
Solution Approach 2:
The frequency parameter variation provides natural signal separation that facilitates rapid yet accurate detection. By encoding signal identity in frequency rather than time separation, the system achieves both fast detection and high accuracy
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 approach reduces the fault-tolerant time between coded amplitude modulation signals, shortening transmission and detection times, and improves the report rate and anti-interference ability of touch screens while maintaining accurate detection of complete signals.
Implementation Method 1
respectively performing amplitude modulation on n binary codes that represent information to be transmitted so as to obtain n coded amplitude modulation signals
Implementation Method 2
continuously detecting n coded amplitude modulation signals which are continuously transmitted by a stylus, by utilizing n+1 detection time slices
Data Source
AI summary
A signal transmitting method includes: performing amplitude modulation respectively on n binary codes that represent information to be transmitted so as to obtain n coded amplitude modulation signals sequentially arranged, wherein n is an integer greater than 1; and continuously transmitting the n coded amplitude modulation signals which are sequentially arranged. The coded amplitude modulation signals, sequence numbers of which are odd, are transmitted at a preset first frequency, and the coded amplitude modulation signals, sequence numbers of which are even, are transmitted at a preset second frequency, whereby fault-tolerant time between coded amplitude modulation signals is saved, transmission time of the same number of coded amplitude modulation signals is reduced, and time required by a screen for completing detection on the coded amplitude modulation signals is reduced, thereby promoting a report rate and improving the anti-interference ability of the screen.