Display Luminance Adjustment for Ambient Contrast
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Solution Overview
Problem
Conventional display metrics, such as contrast ratio, fail to accurately represent display performance under varying ambient luminance conditions, as they do not account for human visual adaptation and the impact of ambient light on perceived contrast.
Innovation Solution
The system adjusts display pixel luminance values based on ambient light measurements, using a modified Weber contrast metric to ensure that displayed information remains visible and legible across different lighting conditions by remapping luminance values to exceed a viewer-specific contrast threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional contrast ratio metrics are used to evaluate display performance, then the evaluation is simple and based on fixed pixel values, but the metrics fail to accurately represent display performance under varying ambient luminance conditions
Solution Approach 1:
The patent changes the parameters used to measure contrast from fixed pixel values (0 and 255) to luminance values that are dynamically adjusted based on ambient light conditions. The system calculates contrast ratio as a function of ambient luminance, allowing the measurement to adapt to different viewing environments while maintaining measurement accuracy.
Solution Approach 2:
The system incorporates feedback by measuring ambient luminance conditions and using this information to adjust the contrast ratio calculation. The electronic processor continuously monitors ambient light levels and modifies the contrast metrics accordingly, creating a closed-loop measurement system that reflects actual viewing conditions.
2Adaptability or versatility
If display luminance values are adjusted to exceed viewer-specific contrast thresholds under varying ambient light, then perceived contrast and visibility are improved, but the display must dynamically adapt to different lighting conditions
Solution Approach 1:
The patent implements dynamics by making the display luminance values adjustable and responsive to ambient light conditions. The system dynamically remaps luminance values based on measured ambient luminance and calculated contrast thresholds, allowing the display to adapt its output characteristics in real-time to maintain optimal contrast perception.
Solution Approach 2:
The system changes the luminance parameters of display pixels based on ambient light measurements. By calculating the contrast threshold as a function of ambient luminance and remapping pixel luminance values to exceed this threshold, the system adjusts display parameters dynamically while maintaining a relatively simple implementation through software-based luminance remapping.
3Reliability
If the display system remaps luminance values to exceed contrast thresholds, then visibility under varying ambient light is improved, but processing complexity increases
Solution Approach 1:
The system performs preliminary calculations of contrast thresholds based on ambient luminance measurements before rendering the actual display content. By pre-calculating the contrast threshold and establishing the luminance remapping function in advance, the system ensures that visibility requirements are met while streamlining the processing pipeline during actual display operations.
Data Source
AI summary
The disclosure features information display systems that include a display device, at least one sensor, and an electronic processor connected to the display device and to the at least one sensor. During operation of the system, for a set of pixels of the display device that are used to display visual information, the electronic processor is configured to determine a range of target luminance values for a subset of the pixels for which a Weber contrast value is less than the contrast threshold value, adjust luminance values for the set of pixels so that at least some members of the subset of pixels have Weber contrast values, based on their adjusted luminance values, that exceed the contrast threshold value, and display the visual information on the display device using the members of the set of pixels with the adjusted pixel luminance values.