Mini LED Display Grayscale Compensation for HDR Accuracy
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Solution Overview
Problem
Existing brightness correction methods for e-sports displays using Mini LEDs result in inaccurate adjustments, making it difficult for displays to pass high-dynamic range (HDR) certification due to large variations in current or duty cycle adjustments.
Innovation Solution
A driving method and display device incorporating a detection module, comparison module, and compensation module to adjust the initial brightness value of images to a target value based on the type of backlight image and current difference, ensuring accurate brightness correction by comparing the initial and target values against preset thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing brightness correction methods adjust current or duty cycle, then brightness can be modified, but the adjustment range is too large resulting in lower or higher display brightness and making it difficult to pass HDR certification
Solution Approach 1:
The patent changes the correction parameter from current/duty cycle to grayscale value. By adjusting the grayscale value of the backlight image, the system achieves finer control over brightness correction. This parameter transformation enables precise brightness adjustment within a limited range, avoiding the overshooting or undershooting problems that occur with large current or duty cycle adjustments, thereby ensuring HDR certification requirements are met.
Solution Approach 2:
The patent implements a feedback mechanism by comparing the grayscale values of the backlight image with the display image. The detection module obtains grayscale values from both images, and the processing module calculates the difference to determine the correction amount. This closed-loop feedback approach ensures that brightness corrections are precisely targeted and within acceptable ranges, improving both measurement precision and reliability for HDR certification.
2Illumination intensity
If large current or duty cycle adjustment is applied for brightness correction, then brightness can be significantly changed, but the display brightness becomes inaccurate (lower or higher than target)
Solution Approach 1:
The patent transforms the brightness correction parameter from current/duty cycle to grayscale value. By modifying the grayscale value of the backlight image rather than directly adjusting current or duty cycle, the system achieves finer, more precise control over brightness. This parameter change enables incremental adjustments that accurately reach the target brightness without overshooting or undershooting.
Solution Approach 2:
The patent applies partial action by making small, controlled adjustments to grayscale values rather than large changes to current or duty cycle. The processing module calculates the grayscale difference and applies only the necessary correction amount, avoiding excessive adjustment that would lead to inaccurate brightness. This controlled partial action ensures brightness corrections are precise and within the target range.
Data Source
AI summary
The present disclosure provides a driving method for a display device and a display device. The driving method for the display device includes: obtaining a type of an initial backlight image according to received data of an image to be displayed, and obtaining an initial current value of the image to be displayed; judging whether the type of the initial backlight image is the same as a type of a preset backlight image, and whether a current difference between the initial current value and a target current value is greater than a preset threshold; and adjusting an initial brightness value of the image to be displayed to a target brightness value in a case where the type of the initial backlight image is the same as the type of the preset backlight image and the current difference is greater than the preset threshold.