Display Apparatus Brightness Conversion for HDR Comparison
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Solution Overview
Problem
Users face difficulties in easily confirming differences in display image quality between various display apparatuses with different upper-limit brightness capabilities, as existing technologies require complex operations to adjust parameters like brightness, EOTF type, and gamma values for each display area.
Innovation Solution
A display apparatus with a processing unit, display control unit, and setting unit that performs image processing and brightness conversion to allow easy comparison of image quality between multiple displays by setting upper-limit brightness and EOTF types, and generating information to highlight differences in display ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a display apparatus displays HDR signals with different brightness ranges, then the display image quality can be compared between multiple display apparatuses, but the user must separately specify multiple parameters (upper-limit brightness, EOTF type, color gamut type, display range) for each display area which complicates the operation
Solution Approach 1:
The display area is divided into multiple regions (first display area and second display area), each capable of displaying different HDR signals with different brightness ranges. This segmentation allows independent optimization of each region while maintaining the ability to compare display quality across regions with different brightness capabilities.
Solution Approach 2:
The system automatically changes multiple parameters (upper-limit brightness, EOTF type, color gamut type, display range) based on the brightness range of each display area. Instead of requiring users to manually specify each parameter, the system adapts these parameters automatically according to the display area's capabilities, thereby simplifying operation while maintaining precise display quality comparison.
2Adaptability or versatility
If image processing is performed to decrease brightness of HDR signals to match lower brightness display apparatuses, then brightness compatibility is improved, but the display range information is lost making it difficult to confirm differences in display image quality
Solution Approach 1:
Different display areas are assigned different brightness ranges and image processing characteristics. The first display area displays HDR signals with a first brightness range, while the second display area displays HDR signals with a second brightness range. This local differentiation preserves display range information in each region while maintaining brightness compatibility across different display apparatus types.
Solution Approach 2:
The system creates multiple copies of the HDR signal for different display areas, with each copy processed according to the specific brightness capabilities of that area. This allows the original display range information to be preserved in each copy while adapting the brightness level to match different display apparatus capabilities.
3Adaptability or versatility
If the same HDR signal is displayed with different brightness levels in different display areas, then brightness adaptation is achieved, but the user cannot easily identify differences in display range without manually adjusting parameters
Solution Approach 1:
The system applies different color gamut types to different display areas (first color gamut type for first display area, second color gamut type for second display area). This color differentiation serves as a visual indicator that helps users easily identify and distinguish between different display ranges and brightness capabilities without requiring manual parameter adjustment.
Data Source
AI summary
A display apparatus includes at least one memory and at least one processor which function as a processing unit, a display control unit, and a setting unit. The processing unit is configured to perform first image processing and second image processing. The display control unit is configured to perform control to perform a first display based on a result of the first image processing and a second display based on a result of the second image processing, together. The setting unit is configured to set upper-limit brightness of the second display. An Electro-Optical Transfer Function (EOTF) type of the first display and an EOTF type of the second display are EOTF types dealing with high dynamic range (HDR). The processing unit converts brightness of an image according to the upper-limit brightness and the EOTF type of the first display in the second image processing.