Touch Display Refresh Frequency Synchronization with Active Pen Beacon
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Solution Overview
Problem
The drive circuit of touch devices often interferes with the electromagnetic signals emitted by active pens, leading to non-precise positioning and malfunction of the active pen during touch operations.
Innovation Solution
The touch system includes a touch device with a touch display panel, a timing control circuit, and a touch detection circuit that synchronizes the refresh frequency of the touch display panel with the frequency of the beacon signal emitted by the active pen, and transmits a start trigger signal after a delay time to minimize signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive circuit operates at a fixed refresh frequency, then the display can maintain stable operation, but the electromagnetic signal from the active pen interferes with the drive circuit causing non-precise positioning and malfunction
Solution Approach 1:
The patent applies dynamics by making the refresh frequency of the touch display panel adjustable and synchronizable with the beacon signal frequency from the active pen. Instead of using a fixed refresh frequency, the system dynamically adjusts the refresh frequency to match the pen's signal frequency, thereby eliminating interference and improving positioning accuracy.
Solution Approach 2:
The patent changes the refresh frequency parameter of the drive circuit to be equal to the beacon signal frequency from the active pen. This parameter adjustment resolves the interference issue by ensuring that the drive circuit operates at a frequency that does not conflict with the pen's electromagnetic signal, thus improving positioning accuracy.
2Object-affected harmful factors
If the refresh frequency is adjusted to match the beacon signal frequency, then signal interference is reduced, but the timing synchronization between frame transmission and signal detection becomes critical
Solution Approach 1:
The patent applies preliminary action by adjusting the refresh frequency to match the beacon signal frequency before signal interference occurs. The timing control circuit proactively synchronizes the drive circuit's operation with the active pen's signal, preventing interference rather than correcting it after the fact.
Solution Approach 2:
The system uses feedback by detecting the beacon signal frequency and adjusting the refresh frequency accordingly. The timing control circuit continuously monitors the signal conditions and adjusts the timing parameters to maintain optimal synchronization, ensuring minimal interference and accurate positioning.
3Ease of operation
If the drive circuit uses continuous electromagnetic signals for touch detection, then touch operations can be detected, but the signals interfere with active pen beacon signals causing malfunction
Solution Approach 1:
The patent applies periodic action by using frame-based refresh cycles that are synchronized with the active pen's beacon signal frequency. Instead of continuous detection, the system uses periodic frame refreshes at matched intervals, which reduces electromagnetic interference while maintaining touch detection capability through the synchronized timing.
Solution Approach 2:
The system applies preliminary anti-action by pre-synchronizing the refresh frequency with the beacon signal frequency before interference can occur. This preventive measure ensures that the drive circuit's electromagnetic signals do not conflict with the active pen's beacon signals, thereby protecting active pen functionality while maintaining touch detection.
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 synchronization and delayed trigger signal configuration reduce noise interference, enhancing the precise positioning and functionality of the active pen by aligning the refresh frequency with the beacon signal, thereby preventing malfunction.
Implementation Method 1
an electromagnetic stylus pen is usually divided into an active type stylus pen (active pen) and a passive type stylus pen. The active pen can actively emit an electromagnetic signal to the touch device
Data Source
AI summary
A control method of a touch system is provided. The touch system includes a touch device and an active pen, the touch device comprises a touch display panel, a timing control circuit, and a touch detection circuit electrically connecting to the timing control circuit. The control method comprises steps of: outputting a beacon signal with a frequency from the active pen; detecting the beacon signal by the touch detection circuit; adjusting a refresh frequency of the touch display panel to be equal to a frequency of the beacon signal when the refresh frequency of the touch display panel is different from the frequency of the beacon signal; and transmitting a start trigger signal of a frame of the adjusted refresh frequency by the timing control circuit after a delay time.