Dynamic Emission Period Control for OLED Display Regions
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Solution Overview
Problem
Organic light emitting display devices face challenges in achieving high luminance and contrast ratio while minimizing power consumption, as the length of the emission period affects emission-luminance and power consumption, with existing simultaneous emission driving techniques either increasing luminance at the cost of high power consumption or reducing luminance at the cost of contrast ratio.
Innovation Solution
A display device and method that dynamically adjust the emission period for each display region based on calculated region grayscales, increasing the emission period for high grayscales and decreasing it for low grayscales, allowing independent emission control and optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the emission period is set to be relatively long, then the emission-luminance is improved, but the power consumption increases
Solution Approach 1:
The patent applies dynamics by making the emission period adjustable rather than fixed. The display device dynamically changes the emission period length based on the grayscale value being displayed, allowing the system to adapt between long emission periods for high luminance requirements and short emission periods for power saving, thus resolving the contradiction between emission-luminance and power consumption
Solution Approach 2:
The patent changes the temporal parameter (emission period length) based on the grayscale parameter. By setting different emission period lengths corresponding to different grayscale values, the system optimizes both luminance output and power consumption for each displayed grayscale level
2Use of energy by moving object
If the emission period is set to be relatively short, then the power consumption is reduced, but the emission-luminance decreases
Solution Approach 1:
The system dynamically adjusts the emission period length based on actual display needs. When low luminance is required, the emission period is shortened to save power; when high luminance is needed, the emission period is extended, thus dynamically balancing power consumption and emission-luminance performance
Solution Approach 2:
The patent implements parameter changes by establishing a relationship between grayscale values and emission period lengths. Lower grayscale values correspond to shorter emission periods for power saving, while higher grayscale values correspond to longer emission periods for sufficient luminance output
3Device complexity
If a fixed emission period is used for all display regions, then the device complexity is reduced, but the adaptability decreases
Solution Approach 1:
The patent applies segmentation by dividing the display panel into multiple independent display regions, each capable of having its own emission period length. This allows different regions to be optimized independently based on their specific grayscale requirements, improving adaptability while maintaining relatively simple control through region-based segmentation rather than pixel-level control
Data Source
AI summary
A display device includes a display panel including a plurality of pixel circuits each having a light-emitting element, the display panel being divided into a plurality of display regions comprising respective groups of the pixel circuits, and a display panel driving circuit configured to drive the display panel by sequentially performing an emission preparation operation, a scan operation, and an emission operation for the pixel circuits, and configured to perform the emission operation independently on each of the display regions, wherein, in each frame, the display panel driving circuit is configured to calculate a region grayscale that each of the display regions is to implement by analyzing grayscale data to be applied to the pixel circuits in each of the display regions, and to change a length of an emission period for each of the display regions based on the calculated region grayscale, the emission operation being performed in the emission period.