Step-down Pixel Response Correction for Display Luminance
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Solution Overview
Problem
Electronic displays face issues with visual artifacts due to variations in light emission response of display pixels, particularly when adaptive refresh rates are used, leading to differences between perceived and target luminance, which affect image quality.
Innovation Solution
Implementing a step-down transition technique that gradually transitions from a higher refresh rate to a lower threshold refresh rate using intermediate step-down refresh rates, such as 30 Hz and 15 Hz, to reduce the difference between expected and actual refresh rates and minimize luminance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If adaptive refresh rates are used to improve power efficiency, then energy consumption is reduced, but visual artifacts and luminance variations increase
Solution Approach 1:
The patent segments the refresh rate transition into multiple discrete steps (e.g., 60Hz → 30Hz → 15Hz → 10Hz) rather than making direct transitions. This segmentation allows the display system to adapt refresh rates in manageable increments, reducing the magnitude of luminance variations and pixel response mismatches at each transition step, thereby minimizing visual artifacts while maintaining power efficiency benefits.
Solution Approach 2:
The patent implements dynamic adjustment of refresh rates based on content characteristics and display conditions. The system dynamically selects appropriate refresh rates and transition paths to balance power consumption with image quality, applying pixel response correction dynamically adapted to the current refresh rate and transition state, thus resolving the contradiction between energy efficiency and visual quality.
2Use of energy by moving object
If refresh rate transitions directly from high to low, then power efficiency improves, but difference between expected and actual luminance increases
Solution Approach 1:
The patent divides the refresh rate transition into multiple intermediate steps with specific refresh rates (e.g., 60Hz, 30Hz, 15Hz, 10Hz). This segmentation ensures that each transition step involves a manageable change in refresh rate, allowing pixel response correction to be more accurately adapted at each step, thereby maintaining luminance accuracy while achieving power efficiency through overall refresh rate reduction.
Solution Approach 2:
The patent applies pixel response correction in advance during the transition process, adjusting for expected luminance variations before they become perceptible. By pre-compensating for the effects of refresh rate changes at each intermediate step, the system maintains luminance accuracy throughout the transition to lower refresh rates.
3Manufacturing precision
If pixel response correction is applied based on expected refresh rate, then image quality improves, but visual artifacts increase when expected rate does not match actual rate
Solution Approach 1:
The patent implements a feedback mechanism where the actual refresh rate achieved at each transition step is monitored and used to adjust subsequent pixel response correction parameters. This feedback loop ensures that pixel response correction remains accurately adapted to the actual display conditions, preventing mismatches between expected and actual luminance even when adaptive refresh rate adjustments occur.
Solution Approach 2:
The patent makes pixel response correction dynamically adaptable to changing refresh rates. Rather than using fixed correction parameters, the system continuously adjusts pixel response correction based on the current refresh rate and transition state, ensuring image quality is maintained throughout adaptive refresh rate operations while minimizing visual artifacts.
Data Source
AI summary
Systems and methods are provided for improving displayed image quality of an electronic display that includes a display pixel. The electronic display displays a first image frame directly after a second image frame by applying an analog electrical signal to the display pixel. To facilitate display of the first image frame, circuitry receives image data corresponding to the image frame, in which the image data includes a grayscale value that indicates target luminance of the display pixel; determines expected refresh rate of the first image frame based at least in part on actual refresh rate of the second image frame; determines a pixel response correction offset based at least in part on the expected refresh rate of the first image frame; and determines processed image data by applying the pixel response correction offset to the grayscale value, in which the processed image data indicates magnitude of the analog electrical signal.