OLED Controller APL-Based Luminance Conversion
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Solution Overview
Problem
Existing image display technologies face challenges in enhancing luminance representation during image display, particularly in high-dynamic range (HDR) and normal modes, where maintaining optimal luminance across varying Average Picture Levels (APL) is crucial for improved visual quality.
Innovation Solution
An image display apparatus featuring an organic light emitting diode (OLED) panel and a controller that calculates the APL of input images, adjusts luminance accordingly by decreasing APL in HDR mode and performing luminance conversion based on calculated APL in normal mode, thereby optimizing luminance representation across different image regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If luminance conversion is performed based on calculated APL in normal mode, then luminance representation is improved, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting luminance conversion based on calculated APL values. The controller modifies luminance parameters according to the APL of input images, switching between different luminance conversion strategies (decreasing APL in HDR mode when APL >= reference value, or performing luminance conversion based on calculated APL in normal mode) to optimize the balance between luminance representation and power consumption.
2Illumination intensity
If APL is decreased in HDR mode to improve luminance, then luminance representation is enhanced, but image brightness uniformity deteriorates
Solution Approach 1:
The patent applies local quality by performing region-based luminance adjustment. The controller divides the image into different luminance regions (first luminance region with luminance higher than first reference luminance, and second luminance region with luminance lower than or equal to second reference luminance) and applies different luminance conversion strategies to each region, thereby enhancing luminance representation while maintaining overall image brightness uniformity.
3Manufacturing precision
If luminance conversion is performed based on calculated APL, then visual quality is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by calculating the APL of input images before performing luminance conversion. The controller pre-calculates the APL value and uses it to determine the appropriate luminance conversion strategy, which simplifies the subsequent processing by providing a clear decision criterion for HDR mode switching and luminance adjustment parameters.
4Illumination intensity
If HDR mode is used to enhance luminance, then luminance representation is improved, but compatibility with standard displays deteriorates
Solution Approach 1:
The patent applies dynamics by implementing dynamic mode switching between HDR and normal modes based on calculated APL values. The controller dynamically adjusts the display mode and luminance conversion parameters according to the input image characteristics, allowing the system to adapt to different display capabilities and content requirements, thereby maintaining both enhanced luminance representation and broad compatibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively enhances luminance representation in both HDR and normal modes by dynamically adjusting luminance, improving visual quality and power efficiency, while allowing for user-controlled settings through dynamic tone mapping and reference value adjustments.
Implementation Method 1
a display including an organic light emitting diode panel (OLED panel)
Data Source
AI summary
The present disclosure relates to an image display apparatus. The image display apparatus includes: a display including an organic light emitting diode panel (OLED panel); and a controller configured to control the display, wherein the controller calculates an Average Picture Level (APL) of an input image, and in response to the calculated APL being greater than or equal to a first reference value in a high-dynamic range (HDR) mode, the controller decreases the APL and perform luminance conversion based on the decreased APL, and in response to the calculated APL being greater than or equal to the first reference value in a normal mode rather than the HDR mode, the controller performs luminance conversion based on the calculated APL. Accordingly, luminance representation may be improved during displaying image.