Variable Pixel Block Boundary for Display Luminance Uniformity
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Solution Overview
Problem
Display devices face image quality deterioration due to increased transition time and decreased charging rate of pixels farther from the data driver, especially as resolution increases, leading to luminance differences at pixel block boundaries.
Innovation Solution
A display device with a data driver that divides the panel into pixel blocks and outputs data voltage with varying slew rates based on distance from the driver, allowing adjustable and dynamic boundary settings between blocks to maintain uniform charging rates and minimize perceived luminance differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the resolution of the display device is increased, then the image detail and clarity are improved, but the transition time of data voltage decreases and charging rate deteriorates, leading to worsened image quality
Solution Approach 1:
The patent applies local quality by dividing the display panel into multiple pixel blocks and assigning different slew rates to different blocks based on their distance from the data driver. Pixels closer to the data driver receive lower slew rates while pixels farther away receive higher slew rates, compensating for the increased RC delay and maintaining uniform charging rates across the entire panel despite high resolution requirements.
Solution Approach 2:
The patent changes the slew rate parameter of the data voltage dynamically based on the spatial position of pixel blocks. By adjusting the slew rate parameter according to distance from the data driver, the system compensates for signal degradation and maintains consistent charging performance across all pixels even at high resolutions.
2Device complexity
If the data voltage is output with a fixed slew rate to all pixel blocks, then the device complexity is reduced, but luminance differences occur at pixel block boundaries due to varying distances from the data driver
Solution Approach 1:
The patent implements local quality by setting different slew rates for different pixel blocks based on their distance from the data driver. This creates spatially varying control parameters that compensate for the RC delay gradient across the panel, ensuring uniform luminance output without requiring complex per-pixel control.
Solution Approach 2:
The patent introduces dynamics by making the slew rate adjustable and changeable over time. The boundary between pixel blocks with different slew rates can be dynamically repositioned, allowing the system to adapt to different display conditions and maintain optimal performance while avoiding fixed, rigid control structures.
3Device complexity
If the boundary between pixel blocks with different slew rates is fixed, then the device complexity is reduced, but perceived luminance differences occur at the boundaries
Solution Approach 1:
The patent applies dynamics by making the pixel block boundaries changeable over time. The boundary between regions with different slew rates can be repositioned dynamically, preventing static visual artifacts at fixed boundaries while maintaining relatively simple control logic.
Solution Approach 2:
The patent implements periodic action by periodically changing the position of pixel block boundaries. This periodic repositioning prevents the human eye from perceiving fixed luminance differences at static boundaries, effectively masking potential artifacts while keeping the control mechanism relatively simple.
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
This approach ensures uniform transition times and charging rates across pixels, enhancing image quality by reducing luminance differences at block boundaries and maintaining high image quality even at higher resolutions.
Implementation Method 1
The data voltage may be delayed by a resistor-capacitor (RC) delay depending on a distance from a data driver to the pixel.
Implementation Method 2
a data driver configured to arrange the display panel into a plurality of pixel blocks, and to output a data voltage with different slew rates to the plurality of pixel blocks
Implementation Method 3
a bias generator configured to provide a bias current to the plurality of output buffers. The bias current may be changed such that the plurality of output buffers output the data voltage with different slew rates
Data Source
AI summary
A display device including: a display panel including a plurality of pixels; and a data driver configured to arrange the display panel into a plurality of pixel blocks, and to output a data voltage with different slew rates to the plurality of pixel blocks, wherein the slew rates are based on distances of the plurality of pixel blocks from the data driver, wherein a boundary between adjacent pixel blocks with different slew rates is changeable.