Ambient-Aware Display Backlight Control for Tone Range Balance
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Solution Overview
Problem
Existing display control methods fail to flexibly adjust the illumination ratio of a backlight based on both signal values corresponding to an input image and surrounding environmental light conditions, resulting in an invariable relative relationship between backlight illumination ratios for high and intermediate tone ranges regardless of ambient brightness.
Innovation Solution
A display apparatus and method that determines the illumination ratio of a backlight for each area on the display based on input signals and environmental light conditions, assigning higher ratios to high tone ranges and adjusting intermediate tone ranges based on ambient brightness, using a backlight illumination ratio determiner and display controller to enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the illumination ratio is adjusted based on surrounding brightness to control stretching amount, then the maximum luminance is optimized for ambient conditions, but the relative relationship between illumination ratios for high and intermediate tone ranges becomes invariable
Solution Approach 1:
The patent segments the tone range into multiple regions (high tone range and intermediate tone range) and applies different control strategies to each segment. The illumination ratio for the high tone range is determined to maintain brightness, while the illumination ratio for the intermediate tone range is adjusted based on surrounding brightness, allowing flexible adaptation to ambient conditions while preserving highlight detail.
Solution Approach 2:
The patent applies different illumination ratio characteristics to different tone ranges within the image. Specifically, the high tone range receives a different illumination ratio treatment compared to the intermediate tone range, allowing each region to have optimized quality characteristics appropriate to its tonal requirements while adapting to surrounding brightness conditions.
2Use of energy by moving object
If the illumination ratio is uniformly adjusted based on surrounding brightness, then energy consumption is reduced in bright environments, but high tone range brightness is compromised
Solution Approach 1:
The patent segments the illumination control into different tone ranges, allowing the high tone range to maintain its illumination ratio independently of surrounding brightness conditions, while other ranges can be adjusted for energy savings. This ensures highlight brightness is preserved even when overall backlight power is reduced in bright environments.
Solution Approach 2:
The patent changes the illumination ratio parameter selectively for different tone ranges based on surrounding brightness conditions. The high tone range illumination ratio is maintained at a level that preserves brightness, while other ranges may have their illumination ratios adjusted to optimize energy consumption, achieving a balance between power efficiency and image quality.
Data Source
AI summary
A display apparatus includes: a display that displays an image; a receiver that receives input signals corresponding to an input image; a surrounding environmental data processor that determines a surrounding environmental light condition including information representing a brightness of surroundings of the display apparatus; a backlight illumination ratio determiner that determines, for each of a plurality of areas set on the display, an illumination ratio of a backlight of the display based on the input signals and the surrounding environmental light condition; and a display controller that causes the display to display the input image by illuminating the backlight of the display based on the illumination ratio, wherein the backlight illumination ratio determiner determines the illumination ratio so that areas corresponding to a high tone range are assigned an illumination ratio of greater than or equal to an illumination ratio threshold value, the high tone range including input signals having a signal value of greater than or equal to a first signal threshold value.