Voltage Compensation Circuit for Display Panel RC Delay
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Solution Overview
Problem
Liquid crystal display panels experience non-uniform brightness due to varying RC delays along the transmission path, leading to inadequate charging rates for pixels, especially when driven by thin film transistors, resulting in defects in image display.
Innovation Solution
A voltage compensation circuit comprising a counting unit, voltage generation unit, and compensation voltage output unit, which adjusts the compensation voltage based on the counted rising edges from the timing control unit to ensure uniform charging rates across the display panel by integrating resistors and a bipolar-junction transistor, thereby compensating for the RC delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display panel size and resolution are increased, then the display quality is improved, but the RC delay increases causing non-uniform brightness
Solution Approach 1:
The patent applies local quality by providing different compensation voltages to different regions of the display panel. The voltage compensation circuit generates adjusted voltages based on the position along the source driver, with higher compensation voltages applied to pixels farther from the source driver to offset the RC delay effect, thereby achieving uniform brightness across the entire panel despite varying transmission path characteristics.
2Area of stationary object
If the transmission path length increases, then the display area is expanded, but the charging rate decreases due to RC delay
Solution Approach 1:
The patent implements preliminary action by pre-calculating and applying compensation voltages before the actual pixel charging process. The voltage compensation circuit determines the appropriate compensation voltage based on the pixel position in advance, ensuring that pixels experiencing greater RC delay receive higher voltages to maintain the required charging rate, thus preventing display defects.
3Device complexity
If a simple voltage supply is used, then the device complexity is reduced, but the charging rate uniformity deteriorates
Solution Approach 1:
The patent applies dynamics by making the voltage supply dynamic rather than static. The voltage compensation circuit continuously adjusts the compensation voltage based on the pixel position and timing information from the timing control unit, creating a dynamic voltage supply system that adapts to the varying RC delay characteristics across different regions of the display panel, thereby achieving uniform charging rates.
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 achieves a uniform charging rate for each row of pixel units, improving the overall display quality by adjusting the charging voltage, thus ensuring consistent brightness across the display panel.
Implementation Method 1
a first end of the fourth resistor is connected with the voltage generation unit, and a second end of the fourth resistor is connected with a control electrode of the bipolar-junction transistor; and a first electrode of the bipolar-junction transistor is connected with the feedback terminal of the power supply unit
Data Source
AI summary
Provided are voltage compensation circuit, voltage compensation method thereof, display panel and display apparatus. The voltage compensation circuit includes counting unit, voltage generation unit, compensation voltage output unit and power supply unit; the counting unit is connected with timing control unit of a display panel and the voltage generation unit, and configured to count rising edges output from the timing control unit and output corresponding control signal based on the counted number of rising edges; the voltage generation unit is connected with the compensation voltage output unit and configured to output corresponding control voltage based on the control signal output from the counting unit; the compensation voltage output unit is connected with feedback terminal and voltage output terminal of the power supply unit and low level terminal, and configured to output corresponding compensation voltage to the voltage output terminal based on the control voltage output from the voltage generation unit.