Gate Driver Compensation for LCD Scan Signal Uniformity
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Solution Overview
Problem
Conventional gate drivers in high-resolution liquid crystal displays experience significant layout resistance variations between output channels and the display panel, leading to disparities in scan signal output, resulting in the 'multi-band phenomenon' and compromised image quality.
Innovation Solution
A gate driver with a scan signal generating unit and a compensation unit that includes switching means and resistance-supply means to provide compensation resistance, reducing layout resistance variations between output channels and the display panel, ensuring consistent scan signal output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional gate driver is employed in a high resolution display panel, then the device structure is simple, but the layout resistance variation between output channels and the display panel is overly large
Solution Approach 1:
The patent applies local quality by introducing different compensation resistance values to different output channels based on their specific wiring distances. Each output channel receives tailored compensation (e.g., larger compensation for channels with longer wiring distances) rather than a uniform approach, thereby reducing layout resistance variation across channels while maintaining overall device simplicity.
2Area of stationary object
If the wiring distance from each output channel to the display panel is different, then the gate driver can cover the entire display area, but the layout resistance variation becomes overly large
Solution Approach 1:
The patent implements parameter changes by dynamically adjusting the compensation resistance values based on the wiring distance parameters of each output channel. The compensation unit modifies electrical parameters (resistance) in response to varying physical parameters (wiring distance), thereby maintaining consistent scan signal output across different display areas despite varying path lengths.
3Adaptability or versatility
If the layout resistance variation is overly large, then the gate driver can accommodate different wiring configurations, but the scan signal output disparity becomes too large
Solution Approach 1:
The patent employs feedback mechanisms where the compensation unit receives information about the actual scan signal output and wiring conditions, then adjusts the compensation resistance accordingly. This closed-loop approach ensures that scan signal output consistency is maintained across different wiring configurations by continuously adapting the compensation parameters based on observed performance.
4Productivity
If the gate driver outputs scan signals with large variations, then all pixels can be turned on, but the multi-band phenomenon occurs affecting image quality
Solution Approach 1:
The patent applies preliminary anti-action by pre-compensating for resistance variations before the scan signals are output to the display panel. The compensation unit proactively adjusts the signal characteristics in advance based on predicted wiring resistance variations, preventing the multi-band phenomenon from occurring in the first place rather than correcting it after it appears.
Data Source
AI summary
A gate driver and a liquid crystal display using the same are provided. The gate driver includes a scan signal generating unit and a compensation unit. The scan signal generating unit has a plurality of output channels, and is used for sequentially outputting a scan signal through the output channels according to a basic clock and a start pulse. The compensation unit is coupled to the scan signal generating unit, and used for compensating the total resistance of each of the output channels, and sequentially receiving and transmitting the scan signal to a display panel.