Display Overdriving Data for Uniform Charging Rate
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Solution Overview
Problem
Display devices face image quality deterioration due to varying transition times of data voltage across pixels, leading to non-uniform charging rates as the distance from the data driver increases, especially with higher resolutions.
Innovation Solution
A method involving the use of overdriving data to ensure uniform charging rates by measuring luminance with specific data voltages applied across pixels in different frames, determining overdriving values based on reference gray levels, and storing these values in an overdriving data memory to compensate input image data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the resolution of the display device is increased, then the display quality is improved, but the transition time of data voltage increases and charging rate decreases for pixels far from the data driver
Solution Approach 1:
The patent applies local quality by determining overdriving values specific to each pixel's position and characteristics. Different pixels receive different overdriving compensation amounts based on their distance from the data driver and their individual charging characteristics, allowing each pixel to achieve uniform charging despite variations in position and resolution requirements.
Solution Approach 2:
The patent changes the data voltage parameter dynamically by adding overdriving compensation amounts to the reference gray level voltage. This parameter adjustment compensates for RC delay effects and ensures that pixels at different distances from the data driver receive appropriate voltage levels to achieve uniform charging rates across the display panel.
2Manufacturing precision
If the data writing time is extended to improve charging uniformity, then the charging rate becomes more uniform, but the frame rate decreases and display response time increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing overdriving values in a lookup table during an initialization phase. During actual display operation, these pre-computed values are simply retrieved and applied to pixels based on their position and characteristics, avoiding the need for time-consuming real-time calculations while ensuring uniform charging.
Solution Approach 2:
The patent makes the data voltage dynamic by adjusting it based on each pixel's specific characteristics and position. The overdriving compensation is applied dynamically during the data writing phase to optimize charging speed for each pixel without requiring extended writing times, thus maintaining high frame rates while achieving uniform charging.
3Manufacturing precision
If overdriving compensation is applied to all pixels, then charging uniformity is improved, but the complexity of data processing increases
Solution Approach 1:
The patent applies segmentation by dividing the display panel into different regions based on pixel position and characteristics. Different overdriving compensation strategies are applied to different segments of the display, allowing for simplified processing in each region while maintaining overall charging uniformity across the entire panel.
Solution Approach 2:
The patent uses a lookup table approach where overdriving values for different pixel types and positions are pre-calculated and stored. During operation, the system copies the appropriate pre-computed values from the lookup table rather than calculating them in real-time, significantly reducing processing complexity while maintaining charging uniformity.
Data Source
AI summary
A method of obtaining overdriving data includes providing a first data voltage corresponding to a current line reference gray level to a second pixel for first and second data writing times for first and second pixels in a first frame, measuring first luminance based on the first data voltage, applying a second data voltage corresponding to a previous line reference gray level for the first data writing time in a second frame, providing a third data voltage of an overdriving voltage corresponding to a predicted overdriving gray level added to the first data voltage for the second data writing time in the second frame, measuring second luminance based on the third data voltage, and determining an overdriving value corresponding to a reference gray level pair of the current and the previous line reference gray level as the predicted overdriving gray level when the first and second luminance are the same.