Liquid Crystal Display Panel Sub-Pixel Gate Off Voltage Control
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Solution Overview
Problem
Liquid crystal display devices face challenges in maintaining display quality due to differences in driving properties of red, green, and blue sub-pixels over time, leading to varying leakage currents and color differences.
Innovation Solution
The implementation of a liquid crystal display device with distinct gate off voltages and control transistors for each sub-pixel, along with diodes and specific voltage control signals, to minimize leakage currents and maintain consistent display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same gate off voltage is applied to all sub-pixels, then the device structure is simple, but leakage currents vary due to different driving properties of red, green, and blue sub-pixels
Solution Approach 1:
The patent applies different gate off voltages to different sub-pixels (red, green, blue) based on their specific driving properties. Each sub-pixel receives a tailored voltage level that compensates for its unique leakage characteristics, thereby improving display quality consistency without requiring complete structural redesign
Solution Approach 2:
The patent changes the voltage parameter (gate off voltage level) to match the driving properties of different sub-pixels. By adjusting this electrical parameter rather than redesigning the entire control structure, the system achieves better performance while maintaining reasonable complexity
2Reliability
If distinct gate off voltages are provided to each sub-pixel, then leakage currents are minimized, but the device complexity increases
Solution Approach 1:
The gate driver is segmented into multiple output channels, each capable of providing a distinct gate off voltage to different sub-pixels. This segmentation allows independent voltage control for each color channel, minimizing leakage currents while distributing the complexity across modular components
Solution Approach 2:
The gate driver circuit is designed to perform multiple functions: it can provide different gate off voltages to different sub-pixels, maintain consistent display quality, and minimize leakage currents. This multi-functionality reduces the need for separate dedicated circuits for each function
Data Source
AI summary
A liquid crystal display device includes a liquid crystal display panel including a plurality of pixels, a voltage generator generating a gate on voltage and a gate off voltage, a gate driver generating a gate signal provided to the pixel using the gate on voltage and the gate off voltage, and providing the gate signal to the pixels, a data driver providing a data signal to the pixels, and a timing controller generating control signals that control the gate driver and the data driver. Each of the pixels includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel. A voltage level of the gate off voltage provided to the red sub-pixel, a voltage level of the gate off voltage provided to the green sub-pixel, and a voltage level of the gate off voltage provided to the blue sub-pixel are different from one another.