Display Control Apparatus Luminance Consistency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display technologies using mapping curves for image processing face significant power consumption issues and luminance inconsistencies, particularly with images having white backgrounds, leading to voltage drops and varying luminance across the display panel.
Innovation Solution
A display control apparatus that constructs a histogram based on pixel gray values, determines a maximum output image signal value, and adjusts the mapping curve to generate an output image signal, thereby reducing power consumption and luminance differences by optimizing the display panel's luminance consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a mapping curve is used to process images with white backgrounds, then power consumption is reduced, but luminance consistency deteriorates due to voltage drops
Solution Approach 1:
The patent applies local quality by dividing the display panel into multiple regions (e.g., first region and second region) and applying different mapping curves to different regions. This allows each region to be optimized independently, compensating for location-dependent voltage drops while maintaining overall power efficiency and luminance consistency across the display.
Solution Approach 2:
The patent implements dynamics by making the mapping curve adjustable and adaptable based on image characteristics and display conditions. The system dynamically selects or modifies mapping curves according to the specific image content (e.g., white background images) and display region, enabling real-time optimization of both power consumption and luminance consistency.
2Illumination intensity
If the average luminance of the output image signal is increased, then image visibility is improved, but voltage drop increases leading to greater luminance variation
Solution Approach 1:
The patent addresses this contradiction by applying different mapping curves to different display regions based on their specific voltage drop characteristics. Regions experiencing greater voltage drops receive adjusted mapping curves that compensate for the expected luminance reduction, thereby maintaining consistent luminance across the display even when overall luminance is increased for better visibility.
3Device complexity
If a conventional mapping curve is used for all images, then device complexity is reduced, but luminance consistency deteriorates for specific image types
Solution Approach 1:
The patent implements a dynamic mapping curve selection mechanism that adapts to different image types and display regions. The system determines whether an image has characteristics requiring special processing (e.g., white backgrounds) and selects appropriate mapping curves accordingly. This dynamic approach maintains luminance consistency without requiring overly complex processing for all images.
Solution Approach 2:
The patent applies parameter changes by modifying the mapping curve parameters based on image characteristics and display region. Instead of using a fixed mapping curve, the system adjusts parameters such as gradient and curvature to optimize performance for specific image types while maintaining simplicity in the overall processing architecture.
Data Source
AI summary
A display control apparatus, including a histogram constructer configured to construct a histogram based on a gray value of each pixel of an input image signal, a maximum value determiner configured to determine a maximum value of an output image signal based on the input image signal, and a mapping curve determiner configured to determine a mapping curve for generating the output image signal from the input image signal, based on the histogram and the maximum value.