Display Driving Circuit Non-Overlapping Source Driver Timing
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Solution Overview
Problem
As display panels increase in size, broadband electromagnetic interference (EMI) occurs between adjacent data lines in display driving devices, affecting device performance and reliability.
Innovation Solution
A display driving circuit is designed with multiple source driver circuits, each activating data lines with distinct output spreading times to prevent overlapping, ensuring non-overlapping output spreading times for first, second, and third source data lines, thereby minimizing EMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple source driver circuits simultaneously output data to adjacent data lines, then data transmission efficiency is improved, but broadband electromagnetic interference occurs between data lines
Solution Approach 1:
The patent applies periodic action by implementing sequential output timing for different data lines. The controller enables first data lines at a first time and second data lines at a second time, creating a time-periodic transmission pattern that prevents simultaneous activation of adjacent lines, thereby reducing electromagnetic interference while maintaining overall data transmission efficiency
Solution Approach 2:
The patent implements preliminary action by pre-planning and controlling the output timing of different data lines through a controller. The controller determines and enforces non-overlapping time windows for different data line groups before interference can occur, preventing the electromagnetic interference problem before it arises
2Speed
If data lines are activated simultaneously, then output speed is improved, but electromagnetic interference increases
Solution Approach 1:
The patent uses periodic action by implementing sequential output timing for different data lines. The controller enables first data lines at a first time and second data lines at a second time, creating a time-periodic transmission pattern that prevents simultaneous activation of adjacent lines, thereby reducing electromagnetic interference while maintaining overall data transmission efficiency
Solution Approach 2:
The patent applies segmentation by dividing the data transmission process into separate time segments for different data line groups. Instead of activating all data lines simultaneously, the system segments the output into multiple time windows, with each window dedicated to specific data lines, thereby reducing interference while maintaining throughput
Data Source
AI summary
A display driving circuit is provided. The display driving circuit includes a timing controller configured to output image data and a source control signal, a first source driver circuit configured to output first source data of the image data by activating a plurality of first data lines in accordance with the source control signal, the first data lines having a first output spreading time, a second source driver circuit configured to output second source data of the image data by activating a plurality of second data lines in accordance with the source control signal, the second data lines having a second output spreading time, and a third source driver circuit configured to output third source data of the image data by activating a plurality of third data lines in accordance with the source control signal, the third data lines having a third output spreading time, wherein the first output spreading time, the second output spreading time and the third output spreading time do not overlap.