Multi-Driver Display Panel Timing Calibration for Touch Synchronization
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Solution Overview
Problem
In touch panels driven by multiple driver circuits, synchronization issues arise due to non-synchronous touch driving signals, leading to poor demodulation of sensing signals.
Innovation Solution
A driving system with multiple driver circuits that perform a calibration mode to calculate timing differences and a synchronization mode to synchronize sensing operations by using synchronization signals and compensation times based on path delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple driver circuits are used to drive large-size high-resolution touch panels, then the driving capability is improved, but synchronization issues occur leading to poor demodulation of sensing signals
Solution Approach 1:
The patent implements a feedback mechanism where driver circuits exchange synchronization signals and path delay information with each other. Each driver circuit measures the path delay by receiving synchronization signals from other driver circuits and calculating the time difference. This feedback loop enables automatic adjustment of sensing operation timing to achieve synchronization across all driver circuits, resolving the synchronization accuracy issue while maintaining multi-driver capability.
Solution Approach 2:
The patent changes the timing parameter of sensing operations based on measured path delays. Each driver circuit adjusts its sensing operation start time by adding a compensation value derived from the path delay measurement. This parameter adjustment ensures that all driver circuits perform sensing operations simultaneously despite different signal transmission paths, thereby maintaining synchronization accuracy while using multiple driver circuits.
2Device complexity
If driver circuits operate independently without synchronization, then device complexity is reduced, but demodulation performance deteriorates
Solution Approach 1:
The patent enables driver circuits to perform self-calibration by automatically measuring path delays and calculating compensation values without external intervention. Each driver circuit independently receives synchronization signals, measures the time difference, and adjusts its own sensing operation timing. This self-service mechanism achieves precise synchronization and accurate demodulation while maintaining operational independence and avoiding complex external control systems.
3Reliability
If synchronization signals are transmitted between driver circuits, then sensing synchronization is improved, but signal transmission time and complexity increase
Solution Approach 1:
The patent performs path delay measurement and compensation value calculation in advance during an initialization phase before actual touch sensing operations begin. By pre-establishing the synchronization timing and compensation values, the system avoids real-time calculation delays during touch detection. The preliminary synchronization setup enables subsequent fast and accurate touch sensing operations without recurring transmission time penalties.
Data Source
AI summary
A first driver circuit is couplable to at least one second driver circuit. Each of the first/second driver circuits has a first terminal and a second terminal. The first terminal of each driver circuit is commonly coupled to a first transmission bus, and the second terminal of each driver circuit is commonly coupled to a second transmission bus. The first driver circuit outputs a first synchronization signal to the first transmission bus through the first terminal, receives a second synchronization signal from the second transmission bus through the second terminal wherein the second synchronization signal is output by one of the second driver circuit at the time when this second driver circuit receives the first synchronization signal, and calculates a compensation time corresponding to this second driver circuit according to an output time point of the first synchronization signal and a reception time point of the second synchronization signal.