Gate Driving Circuit Inversion Units for Source Driver Load Reduction
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Solution Overview
Problem
In liquid crystal displays, the high refresh rate in heavy-load screen stages leads to excessive load on the source driver, causing temperature issues and inefficiencies, which existing technologies have not adequately addressed.
Innovation Solution
A gate driving circuit with 4n stages of shift register units and n stages of inversion units, where one inversion unit is placed between every two groups of four adjacent shift register units, outputs gate driving signals in inverted phases during heavy-load stages and in positive phases during normal stages, reducing the frequency of polarity change in the source driving signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the refresh rate is increased in heavy-load screen stage, then the display performance is improved, but the load on the source driver becomes excessively high causing temperature issues
Solution Approach 1:
The patent applies dynamics by making the gate driving circuit configurable between different operating modes (normal mode and heavy-load mode). The circuit can dynamically switch its behavior based on the screen stage requirements, allowing high refresh rate in heavy-load stage while managing source driver load through selective signal inversion at specific shift register units.
Solution Approach 2:
The patent changes the parameter of gate driving signal phase by introducing inversion units that can flip the phase of signals from specific shift register units. This parameter change allows the system to handle heavy-load conditions by inverting signals from the last two shift register units, thereby reducing the load on the source driver while maintaining high refresh rates.
2Temperature
If inversion units are added to reduce source driver load, then the temperature issue is mitigated, but the circuit complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the gate driving circuit into functional segments: normal shift register units and special inversion units. The inversion units are strategically placed only at specific positions (between the last two shift register units) rather than throughout the entire circuit, thereby reducing complexity while achieving the temperature mitigation goal.
Solution Approach 2:
The patent applies local quality by making only specific portions of the circuit (the inversion units at particular positions) different from the rest. The inversion units are localized to handle the heavy-load condition, while other parts of the circuit remain unchanged, thus minimizing the overall complexity increase.
Data Source
AI summary
A gate driving circuit includes 4n stages of shift register units, and n stages of inversion units. One of the inversion units is disposed between every two groups of four adjacent stages of shift register units. A (n+1)th stage of the inversion units is disposed between two of the shift register units, and configured to output in inverted phases gate driving signals outputted by the two shift register units in a heavy-load screen stage, and output in positive phases gate driving signals outputted by the two shift register units in a normal screen stage.