Display Apparatus Glare Reduction via Grayscale Tone Mapping
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Solution Overview
Problem
Conventional display apparatuses face challenges in minimizing glare while maintaining image contrast, as they often reduce brightness to alleviate glare, leading to decreased image quality.
Innovation Solution
A display apparatus equipped with sensors to detect ambient brightness and user position, which adjusts the grayscale of the output image using a tone mapping method to differentiate between high and low grayscale ranges, thereby minimizing contrast decrease and preventing glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the brightness of the display panel is increased to improve image quality, then the maximum brightness is improved, but glare becomes more noticeable to users
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the grayscale values of the displayed image based on the measured glare level. When glare exceeds a threshold, the system modifies the brightness parameters of different grayscale ranges (highlighting, middle gray, shadow) to reduce overall glare while preserving perceived image quality through selective brightness adjustment.
Solution Approach 2:
The system implements dynamics by continuously monitoring ambient light conditions and user position, then adaptively adjusting the display output in real-time. The glare reduction mechanism dynamically modifies grayscale characteristics based on current viewing conditions, transitioning between different brightness adjustment strategies as conditions change.
2Object-affected harmful factors
If the brightness of the display panel is decreased to reduce glare, then glare is reduced, but the contrast of the displayed image decreases
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different grayscale ranges within the image. Instead of uniformly reducing brightness across the entire image, the system selectively adjusts brightness parameters for highlight, middle gray, and shadow regions based on their specific contribution to glare and contrast, preserving local contrast while reducing overall glare.
Solution Approach 2:
The system changes parameters by applying different brightness adjustment factors to different grayscale ranges. The highlight brightness parameter, middle gray brightness parameter, and shadow brightness parameter are independently adjusted to achieve glare reduction while maintaining contrast in critical image regions.
3Object-affected harmful factors
If the grayscale of the output image is adjusted to reduce glare, then glare is reduced, but the vividness of contrast may be compromised
Solution Approach 1:
The patent preserves vividness of contrast by applying different grayscale adjustment strategies to different regions of the image. The system maintains or enhances contrast in shadow and middle gray regions while selectively reducing brightness only in highlight regions that contribute most to glare, thereby preserving overall image vividness.
Solution Approach 2:
The system uses feedback from ambient light sensors and user position detection to continuously monitor glare conditions and adjust grayscale parameters accordingly. This closed-loop control ensures that contrast vividness is maintained by adapting the grayscale transformation based on real-time measurement of actual glare levels and viewing conditions.
Data Source
AI summary
The present disclosure provides a display apparatus including: a display; a signal receiver configured to receive an image signal; a signal processor configured to process the image signal received in the signal receiver; a first sensor configured to sense ambient brightness; and a controller configured to control the signal processor to change grayscale of an output image to be displayed on the display based on characteristics of the image signal and characteristics of the display apparatus if a glare level corresponding to the ambient brightness sensed by the first sensor and brightness of the display is greater than a preset threshold.