Importance-Based Image Display Contrast for Lower Power
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Solution Overview
Problem
As display resolution and peak luminance increase in image display apparatuses, power consumption also rises, leading to a trade-off between high power consumption and low contrast ratios.
Innovation Solution
An image display apparatus with a signal processing device that adjusts the average picture level of output images by increasing the contrast ratio in important areas and decreasing luminance in less important areas, based on importance levels calculated through segmentation, depth, light field, or prominence analysis, to improve contrast while reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If display resolution or peak luminance is increased, then image sharpness and quality are improved, but power consumption increases
Solution Approach 1:
The patent segments the image into multiple importance levels (first area with high importance, second area with low importance) and applies different processing strategies to each segment. The signal processing device adjusts brightness and contrast differently for each area based on its importance level, allowing selective optimization that reduces overall power consumption while maintaining image quality in critical regions.
Solution Approach 2:
The patent applies local quality by making different parts of the image have different processing characteristics. High importance areas maintain higher brightness and contrast ratios, while low importance areas have reduced brightness and contrast, optimizing the balance between image quality and power consumption for each local region.
2Use of energy by moving object
If brightness correction is applied to reduce power consumption, then energy usage decreases, but contrast ratio deteriorates
Solution Approach 1:
The patent divides the image into multiple importance levels and applies selective brightness correction. The signal processing device calculates different brightness correction values based on importance levels, applying stronger correction to low importance areas and weaker correction to high importance areas, thereby maintaining contrast ratio while reducing overall power consumption.
Solution Approach 2:
The patent applies partial action by not uniformly reducing brightness across the entire image, but only selectively reducing brightness in low importance areas. This partial correction approach achieves power consumption reduction without excessively degrading the contrast ratio in critical high importance regions.
Data Source
AI summary
An image display apparatus is disclosed. An image display apparatus according to an embodiment of the present disclosure comprises: a display; a signal processing device configured to perform signal processing of an input image and output an image signal corresponding to an output image to, wherein, in response to an importance level of a first area in the input image being a first level and an importance level of a second area being a second level lower than the first level, the signal processing device is configured to control the average picture level of the output image to be lower than the average picture level of the input image by increasing a contrast ratio of the first area and decreasing a luminance level of the second area. Accordingly, it is possible to improve contrast ratio while reducing power consumption.