Multi-Driver Touch Panel Timing Compensation for Synchronized Sensing
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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 inadequate 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 using compensation times based on path delays, ensuring synchronized touch sensing across all driver circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If multiple driver circuits are used to drive large size and high resolution touch panels, then the display capability is improved, but synchronization of touch sensing signals deteriorates
Solution Approach 1:
The master driver circuit receives sensing signals from slave driver circuits, determines demodulation timing based on these feedback signals, and generates synchronized touch driving signals. This feedback mechanism ensures that all driver circuits operate in synchronization despite varying signal transmission paths.
Solution Approach 2:
The master driver circuit acts as an intermediary that coordinates between slave driver circuits. It receives notifications from slaves, calculates compensation times based on signal transmission delays, and generates confirmation signals that synchronize the operation of all driver circuits.
2Device complexity
If driver circuits operate independently without synchronization, then device complexity is reduced, but demodulation accuracy deteriorates
Solution Approach 1:
Each slave driver circuit autonomously generates notification signals and receives confirmation signals from the master to determine its own demodulation timing. This self-service approach allows independent operation while maintaining synchronization through the master's coordination.
Solution Approach 2:
The system dynamically adjusts demodulation timing parameters based on signal transmission delays. The master driver circuit calculates compensation times by comparing notification signal reception times with confirmation signal transmission times, ensuring accurate demodulation despite varying path delays.
3Reliability
If compensation time is calculated for each slave driver circuit, then sensing synchronization is improved, but communication overhead increases
Solution Approach 1:
The master driver circuit calculates compensation times in advance by monitoring notification signals from slave driver circuits. This preliminary calculation of timing parameters allows the system to establish synchronized operation before actual touch sensing begins, reducing communication overhead during active sensing.
Data Source
AI summary
A driving system includes a plurality of driver circuits each having a first terminal and a second terminal. The first terminal is commonly coupled to a first transmission bus, and the second terminal is commonly coupled to a second transmission bus. The driver circuits include a first driver circuit and at least one second driver circuit. Each second driver circuit generates a notification. The first driver circuit receives the notification from each second driver circuit, outputs a confirmation signal through the first terminal after receiving the notification, and starts a preset operation for sensing with a delay of a compensation time for the first driver circuit after outputting the confirmation signal. The second driver circuit further receives the confirmation signal through the first terminal, and starts the preset operation for sensing with a delay of a compensation time for the respective second driver circuit after receiving the confirmation signal.