Retroreflective Member Prismatic Elements Height Tilt Angle
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Solution Overview
Problem
Existing image display devices equipped with retroreflective members suffer from insufficient brightness and difficulty in visually recognizing images due to limitations in the retroreflection performance of prismatic retroreflective elements, especially at larger entrance angles.
Innovation Solution
An image display device incorporating a retroreflective member with prismatic retroreflective elements having a height of 10 μm or more and 1,000 μm or less, and a tilt angle of zero degrees, which enhances the brightness and visibility of images by improving the image forming characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prismatic retroreflective elements are used in image display devices, then retroreflection performance is improved, but brightness and visibility of images deteriorate at larger entrance angles
Solution Approach 1:
The patent applies parameter changes by optimizing the height of prismatic retroreflective elements to a specific range (10 μm to 1,000 μm) and setting the tilt angle to zero degrees. These parameter adjustments resolve the contradiction by maintaining effective retroreflection across various entrance angles while preserving image brightness and visibility, unlike conventional retroreflective elements that degrade at larger angles.
2Reliability
If conventional prismatic retroreflective elements are used, then retroreflection is achieved, but image forming characteristics deteriorate
Solution Approach 1:
The patent improves image forming characteristics by changing the geometric parameters of retroreflective elements to a height range of 10 μm to 1,000 μm and a tilt angle of zero degrees. These parameter modifications enable the system to maintain both reliable retroreflection and superior image forming characteristics, resolving the contradiction between retroreflection reliability and image quality.
3Adaptability or versatility
If retroreflective members are equipped in image display devices, then three-dimensional image display is enabled, but visibility and brightness are insufficient
Solution Approach 1:
The patent resolves the contradiction between three-dimensional display capability and visibility by optimizing the parameters of retroreflective elements. By setting the height to 10 μm to 1,000 μm and the tilt angle to zero degrees, the system achieves both advanced three-dimensional image display functionality and enhanced visibility and brightness, making the displayed images clearly observable.
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 significantly brightens images and enhances their visibility, providing excellent image forming characteristics by optimizing the retroreflection performance of the prismatic retroreflective elements within the specified height and tilt angle range.
Implementation Method 1
a retroreflective member configured to retroreflect at least one of a light beam mirror-reflected off the one face of the half mirror and a light beam transmitted through the one face of the half mirror
Implementation Method 2
A light beam entered to the prismatic retroreflective element is in turn reflected off the three planes, and then retroreflected to the direction of the light source
Data Source
AI summary
An image display device includes a half mirror, an image output device configured to output a light beam to one face of the half mirror, and a retroreflective member configured to retroreflect at least one of a light beam mirror-reflected off the one face of the half mirror and a light beam transmitted through the one face of the half mirror. The retroreflective member has a base material layer and a plurality of prismatic retroreflective elements formed on one face or two faces of the base material layer. The height of the prismatic retroreflective elements is 10 μm or more and 1,000 μm or less. The tilt angle of the optical axis of the prismatic retroreflective elements is zero degree.