Adaptive Display Brightness Control for Viewer Comfort
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Solution Overview
Problem
Conventional image display devices control screen brightness based solely on environmental brightness, failing to account for viewer characteristics such as visual acuity, age, and viewing distance, leading to inadequate glare prevention and increased eye fatigue and power consumption.
Innovation Solution
An image display device with a screen-illuminance measurement unit, a setting unit for viewer information, and a calculator that determines screen luminance based on environmental illuminance, viewer characteristics, and display device parameters to adjust brightness levels, ensuring comfortable viewing and reduced power use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display luminance is increased to improve visibility, then the visibility is improved, but the glare feeling increases and eye fatigue occurs
Solution Approach 1:
The patent applies dynamics by making the display luminance adjustable and adaptive rather than fixed. The system dynamically adjusts the maximum luminance level based on environmental brightness conditions and viewer characteristics (age, visual acuity, viewing distance), allowing the display to optimize visibility while preventing glare and eye fatigue through continuous adaptation to changing conditions.
Solution Approach 2:
The patent changes the parameter of display luminance from a fixed high value to a dynamically adjusted value based on environmental illuminance and viewer parameters. By calculating appropriate maximum luminance levels using these variables, the system achieves optimal visibility without causing glare or eye fatigue, directly addressing the contradiction between visibility improvement and harmful effects.
2Illumination intensity
If the display luminance is increased to improve visibility, then the visibility is improved, but the electric-power consumption increases
Solution Approach 1:
The system dynamically adjusts display luminance based on environmental conditions and viewer characteristics, consuming only the necessary amount of power for each situation. Rather than maintaining high luminance continuously, the system adapts the luminance level to match actual viewing needs, reducing power consumption while preserving visibility where required.
Solution Approach 2:
The patent changes the luminance parameter from a fixed high setting to a calculated optimal setting based on environmental illuminance and viewer parameters. This parameter adjustment ensures that the display consumes minimal power while maintaining sufficient visibility, directly resolving the contradiction between visibility improvement and power consumption increase.
3Device complexity
If the screen brightness is controlled based solely on environmental brightness, then the control is simple, but it fails to account for viewer characteristics leading to inadequate glare prevention
Solution Approach 1:
The patent applies universality by creating a control system that serves multiple functions: it not only responds to environmental brightness but also adapts to different viewer characteristics (age, visual acuity, viewing distance). This multi-functional approach allows a single control system to address various factors affecting glare and comfort, making the system more comprehensive without being overly complex.
Solution Approach 2:
The system uses feedback from multiple sources including environmental illuminance sensors and viewer characteristic inputs to continuously adjust the display luminance. By incorporating feedback loops that consider both environmental conditions and individual viewer parameters, the system achieves accurate glare prevention while maintaining manageable complexity through systematic control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively adjusts screen brightness to match viewer preferences, reducing eye fatigue and power consumption while maintaining visibility across various environmental conditions.
Implementation Method 1
a screen-illuminance measurement unit for measuring the illuminance level close to the display screen
Data Source
AI summary
A display device is provided that controls, considering affection due to a watcher's age and his viewing distance as human-visual characteristics, a display-screen brightness level at which the watcher does not feel glare. The display-screen brightness is most suitably set by simple calculation using relationships among watcher's ages, display sizes, glare levels, and screen-illuminance levels, etc. obtained by a subjective-assessment experiment. According to this display device, considering watcher's various conditions such as the age, the visual acuity, and the viewing distance, even if the watcher watches the display for a relatively long time, the watcher does not feel tiredness; thus, comfortable watching can be achieved.