LCD Feed-Through Voltage Compensation Circuit
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Solution Overview
Problem
In high-definition liquid crystal displays, the increasing number of pixels leads to a higher number of data signal lines and driver ICs, resulting in increased cost and complexity, and the feed-through voltage effect causes voltage differences between pixel electrodes, reducing display quality.
Innovation Solution
A liquid crystal display system utilizing a gate driver and source driver with scan signals featuring three voltage levels, and capacitors to adjust voltages applied to pixel electrodes, ensuring that all pixel units receive the same data signal and maintain identical gray levels by compensating for feed-through voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels is increased to improve definition, then the display quality is improved, but the number of data signal lines and driver ICs increases, resulting in increased cost and complexity
Solution Approach 1:
The patent combines two pixel units into one pixel unit structure, where one data signal line serves two pixel electrodes. This merging approach reduces the number of data signal lines and driver ICs by half while maintaining high definition display capability through time-division multiplexing of signals to the combined pixel units.
Solution Approach 2:
The patent makes a single data signal line serve multiple functions by time-division multiplexing, allowing it to drive multiple pixel electrodes sequentially. This multi-functionality reduces the overall number of signal lines and driver ICs required while maintaining the ability to drive high-definition displays.
2Device complexity
If time-division multiplexing is used to reduce the number of driver ICs, then the device complexity is reduced, but feed-through voltage effect causes voltage differences between pixel electrodes, reducing display quality
Solution Approach 1:
The patent applies preliminary compensation actions by introducing feed-through voltage compensation circuits that predict and counteract the voltage differences caused by feed-through effects before they affect display quality. This allows time-division multiplexing to be used while maintaining voltage uniformity across pixel electrodes.
Solution Approach 2:
The patent implements feedback mechanisms through compensation circuits that monitor and adjust voltages applied to pixel electrodes, detecting and correcting feed-through voltage effects in real-time to maintain uniform gray levels across all pixels despite the time-division multiplexing scheme.
3Measurement precision
If feed-through voltage compensation is implemented, then the display quality is improved, but the circuit structure becomes more complex
Solution Approach 1:
The patent introduces intermediary compensation circuits that act as mediators between the data signal lines and pixel electrodes, specifically designed to counteract feed-through voltage effects. These intermediary elements provide the necessary compensation functionality while maintaining a relatively simple overall circuit architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively compensates for feed-through voltage differences, ensuring that all pixel units in the liquid crystal display exhibit the same gray levels, thereby improving display quality and reducing the complexity and cost associated with the number of driver ICs.
Implementation Method 1
a capacitor electrically coupled to the second pixel electrode and the first scan line
Data Source
AI summary
A liquid crystal display includes a gate driver, a source driver, a plurality of scan lines, a plurality of data lines, and a plurality of pixel units arranged in an array. The gate driver is used for generating scan signals. The scan signals include a first voltage level, a second voltage level greater than the first voltage level, and a third voltage level less than the first voltage level. The source driver is used for generating data signals. The plurality of scan lines includes a first scan line, a second scan line, and a third scan line, for delivering the scan signals. The plurality of data lines includes a first data line for delivering the data signals. Each pixel unit includes a first pixel electrode, a first transistor, a second pixel electrode, a second transistor, and a level adjustment unit.