Optical Member Layout to Prevent External Light Image Superposition
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Solution Overview
Problem
In image display devices, external light reflected by optical members near the light source can superimpose on the image, deteriorating its visibility by entering the screen through the same optical path as the image-forming light.
Innovation Solution
An optical member is disposed between the screen and the image forming element, configured to reflect light in a direction away from the screen, preventing external light from returning and superimposing on the image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an optical member is disposed close to the light source to guide light, then the optical path is optimized, but external light reflected by the optical member enters the screen and superimposes on the image, deteriorating visibility
Solution Approach 1:
The optical member is disposed asymmetrically with respect to the normal of the screen, specifically inclined at an angle different from perpendicular. This asymmetric arrangement causes externally incident light to be reflected away from the screen rather than back along the incident path, thereby preventing image visibility deterioration while maintaining optical guidance functionality
Solution Approach 2:
Instead of disposing the optical member perpendicular to the screen (conventional arrangement), the patent inverts the approach by inclining it at a specific angle. This inversion of the normal disposition transforms the reflection behavior so that external light is directed away from the screen, converting a harmful effect into a beneficial one
2Device complexity
If the optical member is disposed perpendicular to the screen, then the optical path is simplified, but external light reflected by the optical member returns to the screen and superimposes on the image
Solution Approach 1:
The patent introduces asymmetry by inclining the optical member at a specific angle relative to the screen normal, deviating from the symmetric perpendicular arrangement. This asymmetric disposition changes the reflection geometry so that external light is reflected away from the screen, preventing superposition on the image while maintaining relatively simple optical path design
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
This arrangement enhances image visibility by preventing external light from being superimposed on the projected image, thereby improving the overall clarity and quality of the displayed image.
Implementation Method 1
an optical member disposed between the screen and the image forming element, and being configured to reflect light
Data Source
AI summary
Disclosed is an image display device for displaying an image on a screen. The image display device includes an image forming element configured to optically scan a screen, and an optical member disposed between the screen and the image forming element, and being configured to reflect light, where the optical member is disposed such that the reflected light, along normals with respect to every reflecting point on the optical member, is directed away from the screen.