Source Driver Module Switching for Display Noise Reduction
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Solution Overview
Problem
Current liquid crystal display technologies experience noise generation due to charge sharing phenomena caused by voltage differences between pixel signals, which is not effectively addressed by existing source driver circuits.
Innovation Solution
A source driver module with a conductive wire and a switch unit is used to output voltage signals to data lines during specific periods, ensuring the conductive wire and data lines have the same voltage level during switch-off periods to prevent charge sharing and noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multiplexer is disposed between the source driver circuit and the panel to time-division pixel voltage output, then the source driver circuit can drive multiple data lines, but charge sharing phenomenon occurs due to voltage difference between consecutive pixel signals, resulting in internal noise generation
Solution Approach 1:
The patent applies preliminary action by pre-charging the conductive wire to the same voltage level as the data line during a switch-off period before the next data outputting period begins. This preliminary voltage equalization prevents charge sharing when the switch unit turns on, thereby eliminating noise generation while maintaining the ability to drive multiple data lines through time-division multiplexing
2Productivity
If the source driver circuit outputs different voltage signals to the same data line consecutively, then multiple pixel signals can be transmitted, but voltage difference causes charge sharing and noise in the panel
Solution Approach 1:
The patent implements periodic action by introducing a switch-off period between consecutive data outputting periods. During this periodic interval, the source driver circuit outputs a voltage signal to the conductive wire that matches the data line voltage level, creating a regular cycle of charge equalization that prevents noise while maintaining high signal transmission throughput
3Duration of action of moving object
If the switch unit continuously connects the source driver circuit to the data line, then signal transmission is uninterrupted, but charge sharing occurs during voltage transitions, generating noise
Solution Approach 1:
The patent maintains continuity of useful action by ensuring that during the switch-off period, the conductive wire is continuously charged to the same voltage level as the data line. This continuous voltage equalization ensures that when the switch unit reconnects, there is no voltage difference to cause charge sharing, thus maintaining uninterrupted signal transmission without noise
Data Source
AI summary
The present disclosure provides a source driver module for driving a display panel. The source drive module includes a source driver circuit, a first conductive wire and a first switch unit. The first conductive wire is electrically connected to the source driver circuit. The first switch unit is connected between the first conductive wire and a first data line of the display panel to conduct current therebetween during a first data outputting period and a second data outputting period, and to interrupt current therebetween during a first switch-off period connecting the first data outputting period and the second data outputting period. The source driver circuit outputs a first voltage signal during the first data outputting period and the first switch-off period; it outputs a second voltage signal during the second data outputting period; and it outputs the first voltage signal during the first switch-off period.