Transmission Screen Control for Glare Reduction in Projected Displays
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Solution Overview
Problem
In image display systems using transmission type screens, viewers are often dazzled by direct irradiation light from the projector, making it difficult to observe the image comfortably.
Innovation Solution
An image display control device that calculates and adjusts control parameters to minimize discomfort indices by considering the position of the viewer and settings of the light source and screen, ensuring the viewer observes the image without direct exposure to the projector's light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the transmission type screen is arranged in front of the light source and the viewing user is positioned in front of the screen, then the user can observe the image on the screen, but the user is dazzled by the direct irradiation light from the light source and cannot observe the image normally
Solution Approach 1:
The patent makes the screen movable relative to the light source, allowing dynamic adjustment of the screen's position and orientation. This enables the system to adapt to different viewing conditions and minimize direct light exposure to users while maintaining image visibility, thereby resolving the contradiction between ease of observation and harmful light exposure
Solution Approach 2:
The patent changes the spatial parameters (position and orientation) of the screen relative to the light source and viewer. By adjusting these parameters, the system optimizes the viewing angle and distance to reduce direct light exposure while maintaining image quality, thus resolving the contradiction between observation ease and light dazzle
2Illumination intensity
If the light source emits strong irradiation light to display the image on the transmission type screen, then the image visibility is improved, but the dazzle effect on the viewing user increases
Solution Approach 1:
The patent applies different properties to different parts of the system: the screen has selective transparency that allows image light to pass through while blocking direct light from the source. This local quality differentiation enables high image brightness without corresponding increase in dazzle, as the screen filters the light differently for image transmission versus direct source exposure
Solution Approach 2:
The transmission type screen acts as an intermediary between the light source and the viewer. It mediates the light transmission by allowing image-forming light to pass through while scattering or blocking direct source light, thus enabling high image brightness without direct exposure of strong light to the viewer's eyes
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
Enables comfortable image observation by optimizing the position and settings of the light source and screen, reducing glare and improving visibility of the displayed image.
Implementation Method 1
The transmission type screen has a configuration that scatters the light emitted from the projector. The irradiation light constituting an image output by the projector is scattered in the transmission type screen including glass, water droplets or the like.
Implementation Method 2
a light source that executes image output to a transmission type screen; the transmission type screen that receives irradiation light from the light source
Data Source
AI summary
An image display control device includes a light source that executes image output to a transmission type screen, the transmission type screen that receives irradiation light from the light source, a control unit that controls at least one of the light source or the transmission type screen, and a control parameter calculation unit that calculates a control parameter defining a control mode of the control unit. The control parameter calculation unit sets, as input information, position information of a viewing user observing an image on the transmission type screen, and setting information of at least one of the light source or the transmission type screen, and on the basis of the input information calculates a control parameter, and outputs the control parameter to the control unit, and the control unit executes control of the light source or the transmission type screen on the basis of the control parameter.