Display Panel Timing Controller RC Delay Compensation
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Solution Overview
Problem
Display panels face challenges in maintaining image display quality due to increased RC delay and reduced charging time, leading to insufficient charging rate of pixel driving circuits, resulting in non-uniform brightness across the panel.
Innovation Solution
Compensating initial grayscale values for subpixels with delay-compensating factors, calculated using a conversion algorithm or look-up table, to ensure uniform brightness across the panel by adjusting data signal voltages based on the subpixel's distance from the data integrated circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If data lines are extended to cover larger display panels, then display area is increased, but RC delay increases causing non-uniform brightness
Solution Approach 1:
The patent applies local quality by assigning different grayscale compensation values to different regions of the display panel. Specifically, subpixels at different distances from the data integrated circuit receive different compensation values - those farther away receive greater compensation to offset the increased RC delay. This is implemented through a conversion algorithm or look-up table that maps initial grayscale values to compensated grayscale values based on spatial position, ensuring each region receives appropriate compensation for its specific electrical characteristics.
2Productivity
If data transmission speed is increased to improve refresh rate, then productivity is improved, but charging time becomes insufficient leading to brightness non-uniformity
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values in a conversion algorithm or look-up table before actual image display. The compensation values are determined in advance based on the RC delay characteristics of different data line segments. During operation, the timing controller retrieves pre-computed compensated grayscale values from the look-up table or applies the conversion algorithm, allowing real-time compensation without adding processing delays that would affect refresh rate.
3Illumination intensity
If voltage levels are increased to maintain brightness, then illumination intensity is improved, but RC delay effects are exacerbated causing greater non-uniformity
Solution Approach 1:
The patent applies parameter changes by modifying the grayscale voltage parameters dynamically based on spatial position. Instead of using a uniform voltage level for all subpixels, the system adjusts the voltage parameter (grayscale value) according to the distance from the data integrated circuit. The conversion algorithm or look-up table transforms initial grayscale values into compensated values that account for RC delay, effectively changing the voltage parameter to maintain uniform brightness across different regions.
Data Source
AI summary
A method for driving a display panel is provided. The method includes receiving image data of a frame of image, the image data including a plurality of initial grayscale values respectively for a plurality of subpixels in the display panel; and converting the image data into a converted image data including a plurality of converted grayscale values respectively for the plurality of subpixels. Converting the image data includes compensating a respective initial grayscale value for a respective subpixel by at least a respective delay-compensating factor to obtain a respective converted grayscale value. With respect to a p-th subpixel and a q-th subpixel respectively connected to a respective data line and having a same initial grayscale values, a p-th delay-compensating factor for the p-th subpixel is greater than a q-th delay-compensating factor for the q-th subpixel.