Display Panel Brightness Uniformity via Variable Data Voltage Duration
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Solution Overview
Problem
Existing self-luminous display devices face issues with uneven brightness and color cast due to differences in luminous efficiency among light-emitting pixels, which affect the display effect.
Innovation Solution
The display panel and device incorporate a configuration where first and second pixel rows with varying luminous efficiencies are driven by distinct scanning driving circuits, with different data lines and sub-scanning driving circuits, allowing for adjusted data voltage transmission durations to compensate for brightness differences and improve uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If different light-emitting pixels are driven with the same data voltage transmission duration, then the driving circuit structure is simple, but brightness uniformity deteriorates due to varying luminous efficiencies
Solution Approach 1:
The patent applies local quality by differentiating the data voltage transmission duration based on the luminous efficiency characteristics of specific pixel regions. First pixels with lower luminous efficiency are assigned longer transmission durations, while second pixels with higher luminous efficiency are assigned shorter durations, thereby achieving localized optimization of brightness uniformity without requiring complete circuit redesign
Solution Approach 2:
The patent implements dynamics by making the data voltage transmission duration adjustable and variable rather than fixed. The control circuit dynamically sets different transmission durations for different pixel types based on their luminous efficiency characteristics, allowing the system to adapt to varying display requirements while maintaining brightness uniformity
2Illumination intensity
If data voltage transmission duration is extended for lower-efficiency pixels, then brightness uniformity improves, but the overall frame rate or transmission speed decreases
Solution Approach 1:
The patent applies segmentation by dividing the pixel array into first pixels and second pixels based on their luminous efficiency characteristics, and assigning different transmission durations to each segment. This allows the system to optimize transmission time for each pixel type independently, maintaining overall transmission speed while ensuring brightness uniformity across different regions
Solution Approach 2:
The patent implements parameter changes by varying the data voltage transmission duration parameter based on pixel type and luminous efficiency. The control circuit adjusts this parameter dynamically, extending it for lower-efficiency pixels and reducing it for higher-efficiency pixels, thereby optimizing the balance between brightness uniformity and transmission speed
Data Source
AI summary
A display panel and a display device are provided. The display panel includes pixel row groups, scanning driving circuits, first data lines and second data lines. One pixel row group includes first pixel rows and one pixel row includes a first pixel and a second pixel. A luminous efficiency of color light of the first pixel is lower than a luminous efficiency of color light of the second pixel. One scanning driving circuit includes a first sub scanning driving circuit and a second sub scanning driving circuit. In at least one image frame, a duration during which the first pixel is connected to the first data line for transmitting data voltage controlled by the first sub scanning driving circuit is larger than a duration during which the second pixel is connected to the second data line for transmitting data voltage controlled by the second sub scanning driving circuit.