Touch Driver Synchronizing Signal for Display Clock
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Solution Overview
Problem
Existing touch detection devices with integrated display functions face challenges in synchronizing touch drive operations with display operations, particularly due to differences in clock frequencies between touch and display drivers, which can affect the accuracy and efficiency of touch position detection.
Innovation Solution
A touch detection device with a plurality of drive electrodes and detection electrodes, where the number and pulse width of the drive synchronizing signal are dynamically adjusted based on signals from the display driver to ensure accurate touch position detection, even in cases of asynchronous operations between touch and display drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch driver and display driver operate with different clock frequencies, then each driver can be optimized for its specific function, but synchronization between touch drive operation and display operation becomes difficult
Solution Approach 1:
A synchronizing signal is introduced as an intermediary between the touch driver and display driver. The synchronizing signal generation unit generates this signal based on display driver clock signals, and the touch driver uses it to synchronize its operations with the display driver, resolving the synchronization issue caused by different clock frequencies
Solution Approach 2:
The number of pulses in the synchronizing signal is dynamically adjusted based on the ratio of clock frequencies between the touch driver and display driver. This parameter change allows the system to adapt to different frequency ratios and maintain accurate synchronization
2Measurement precision
If the number of pulses in the drive synchronizing signal is increased to improve touch detection accuracy, then touch position detection accuracy improves, but the time required for touch drive operation increases
Solution Approach 1:
The number of pulses in the drive synchronizing signal is made dynamic rather than fixed. It is adjusted based on the clock frequency ratio and can be changed during operation to optimize between detection accuracy and operation time requirements
Solution Approach 2:
The pulse count parameter of the synchronizing signal is changed based on operating conditions. By calculating the appropriate number of pulses based on clock frequency ratios, the system achieves optimal touch detection accuracy while minimizing operation time
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 enhances the accuracy of touch position detection by optimizing the number of pulses in the drive synchronizing signal, improving the synchronization between touch and display operations, and ensuring reliable performance even in worst-case clock frequency differences.
Implementation Method 1
a plurality of detection electrodes extending in a direction crossing the direction in which the drive electrodes extend, and provided to generate capacitances at intersections of the detection electrodes and the drive electrodes
Data Source
AI summary
According to one embodiment, a touch detection device includes a plurality of drive electrodes, a plurality of detection electrodes, a display driver which performs a touch scanning drive by supplying a touch drive signal to a target drive electrode to be driven, and a touch driver which transmits and receives a signal to and from the display driver, wherein at least one of the number of pulses of the drive synchronizing signal and a pulse width of each of the pulses of the drive synchronizing signal is determined based on the signal received from the display driver.