Touch Display Device Integrated Control Circuit EMI Reduction
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Solution Overview
Problem
Traditional touch display devices experience significant electromagnetic interferences between the touch panel and the display panel, leading to poor touch sensing results and low touch sensing frequencies.
Innovation Solution
A touch display device with an integrated control circuit and a touch driver that dynamically adjusts the touch driver's operation based on different touch modes by generating synchronization enabling signals, thereby reducing electromagnetic interferences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the distance between the touch panel and the display panel is reduced to achieve device thinning, then the device thickness is reduced, but electromagnetic interferences between the touch panel and the display panel increase
Solution Approach 1:
The patent applies periodic action by using different synchronization frequencies for display scanning and touch scanning. The display panel operates at a first synchronization frequency while the touch panel operates at a second synchronization frequency, creating periodic action patterns that prevent electromagnetic interference accumulation. This frequency separation allows both panels to operate simultaneously without mutual interference, resolving the contradiction between reduced distance and increased interference.
2Measurement precision
If the touch sensing frequency is increased to improve touch sensing results, then the touch sensing quality is improved, but electromagnetic interferences from the display panel become more severe
Solution Approach 1:
The patent applies parameter changes by modifying the synchronization frequency parameter of the touch panel. Instead of increasing the touch sensing frequency arbitrarily, the system changes the frequency parameter to a specific second synchronization frequency that is different from the display panel's first synchronization frequency. This parameter adjustment maintains high touch sensing quality while avoiding electromagnetic interference resonance with the display panel.
3Device complexity
If traditional touch display device architecture is used, then the device structure is simple, but touch sensing results are poor due to electromagnetic interferences
Solution Approach 1:
The patent applies dynamics by implementing dynamic frequency coordination between the display control circuit and touch control circuit. The system dynamically adjusts the synchronization frequencies based on operating conditions, allowing the touch panel to operate at optimized frequencies that avoid interference while maintaining good touch sensing results. This dynamic approach improves touch sensing quality without significantly increasing device complexity.
Data Source
AI summary
The invention provides a touch display device and an operation method for the touch display device. The touch display device includes an integrated control circuit and a touch driver. The integrated control circuit is coupled to the touch driver. The integrated control circuit outputs a first synchronization signal to the touch driver. The touch driver outputs a touch mode signal to the integrated control circuit, so that the integrated control circuit generates a synchronization enabling signal to the touch driver according to the touch mode signal.