OLED Scan-Line Timing for Sub-Pixel Charging at High Refresh Rates
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Solution Overview
Problem
The charging duration of the storage capacitor in OLED displays is limited, restricting the increase of refresh rate due to higher resolution and refresh rates, leading to inefficiencies in scanning duration and potential undercharging of sub-pixels with lower target grayscales.
Innovation Solution
A driving method that dynamically adjusts the scanning duration of each scan line based on the necessary charging duration of each sub-pixel row, determined by analyzing image data to ensure sufficient charging time for each pixel, thereby optimizing the refresh rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the resolution and refresh rate are increased, then the display quality and performance are improved, but the charging duration of the storage capacitor is shortened
Solution Approach 1:
The patent applies dynamics by making the scanning duration variable rather than fixed. The scanning duration is dynamically adjusted based on the grayscale values of image data for different sub-pixel rows. Sub-pixel rows with lower grayscale values (which require longer charging) are allocated extended scanning duration, while rows with higher grayscale values use standard duration. This dynamic adaptation resolves the contradiction by ensuring sufficient charging time for all sub-pixels even at high refresh rates and resolutions.
Solution Approach 2:
The patent changes the parameter of scanning duration based on image data characteristics. Specifically, it modifies the scanning duration parameter for sub-pixel rows requiring longer charging (those with lower grayscale values) while maintaining standard duration for others. This parameter change allows the system to maintain high refresh rates and resolutions while ensuring adequate charging time for all sub-pixels.
2Reliability
If the scanning duration is uniformly extended for all scan lines, then the charging sufficiency is improved, but the overall refresh rate decreases
Solution Approach 1:
The patent applies local quality by differentiating the scanning duration allocation across different sub-pixel rows based on their specific charging requirements. Instead of uniformly extending scanning duration for all scan lines, it selectively extends duration only for sub-pixel rows with lower grayscale values that actually require longer charging. This localized approach ensures charging sufficiency for needy sub-pixels while maintaining high refresh rates overall.
Solution Approach 2:
The patent changes the scanning duration parameter selectively for specific sub-pixel rows rather than globally. By modifying the duration parameter only for rows with lower grayscale values (which need longer charging), the system achieves adequate charging sufficiency without sacrificing the overall refresh rate. This targeted parameter change resolves the contradiction between reliability and productivity.
3Productivity
If the scanning duration is reduced to increase refresh rate, then the productivity is improved, but the charging sufficiency for low grayscale sub-pixels deteriorates
Solution Approach 1:
The patent uses dynamics to adaptively adjust scanning duration based on actual charging needs. Rather than using a fixed reduced duration that would compromise charging sufficiency, the system dynamically determines the minimum necessary duration for each sub-pixel row based on its grayscale value. This allows high refresh rates to be maintained while ensuring that sub-pixels with lower grayscale values receive adequate charging time.
Solution Approach 2:
The patent changes the scanning duration parameter based on image data analysis. For sub-pixel rows with lower grayscale values that require longer charging, the duration parameter is extended appropriately. For rows with higher grayscale values, the standard shorter duration is used. This conditional parameter change ensures both high refresh rate productivity and adequate charging sufficiency for all sub-pixels.
Data Source
AI summary
A display panel, a driving circuit, and a display apparatus are provided. The driving method is applicable to a driving circuit. The driving method includes the following. Image data of an image to-be-displayed is acquired. A necessary charging duration of each sub-pixel row according to the image data is determined. The n scan lines are controlled according to a preset sequence to sequentially scan the n sub-pixel rows, to drive the display panel to display the image to-be-displayed, where a scanning duration of each scan line is positively correlated to the necessary charging duration of a sub-pixel row corresponding to the scan line.