Light Guide Plate Gas-Layer Reflection to Suppress Stray Images
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Solution Overview
Problem
Conventional image display devices with metallic reflection surfaces in light guide plates cause unnecessary images to appear in the viewer's field of view, leading to discomfort and potential avoidance of use.
Innovation Solution
Incorporating a light guide plate with a low refractive index layer, such as a gas layer, and using reflection surfaces as interfaces between the light guide plate main body and the low refractive index layer to guide image light to the eyeball, eliminating the need for metallic reflection surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a metallic reflection surface is used in the light guide plate, then the image light can be reflected effectively, but unnecessary images appear in the viewer's field of view
Solution Approach 1:
The patent changes the physical parameter of the reflection surface by replacing metallic material with a dielectric multilayer structure. This dielectric stack provides high reflectivity for s-polarized light while being invisible to the viewer, thereby changing the material composition parameter to eliminate the harmful visual effect while maintaining optical functionality
Solution Approach 2:
The patent introduces a dielectric multilayer structure as an intermediary between the metallic reflection surface and the viewer. This intermediate dielectric stack acts as a mediator that provides the necessary reflection function while preventing the metallic surface from being directly visible, thus eliminating unnecessary images in the field of view
2Object-affected harmful factors
If a low refractive index layer is introduced in the light guide plate, then unnecessary images are suppressed, but the device structure becomes more complex
Solution Approach 1:
The patent merges the low refractive index layer with the existing adhesive layer structure. By integrating the refractive index modification into the adhesive layer that already exists in the device, the solution eliminates unnecessary images without adding separate complex structural elements, thus reducing overall device complexity
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
Prevents unnecessary images from entering the viewer's field of view, enhancing the user experience and appearance of the device.
Implementation Method 1
the reflection surface is an interface between the light guide plate main body and the low refractive index layer
Implementation Method 2
a low refractive index layer provided in the light guide plate main body and having a refractive index lower than a refractive index of the light guide plate main body
Data Source
AI summary
There is provided an image display device that includes a light projection system that projects image light, and a light guide system that includes a light guide plate having a reflection surface inside, the light guide plate guiding the image light from the light projection system to an eyeball, in which the light guide plate includes a light guide plate main body, and a gas layer provided in the light guide plate main body, and the reflection surface is an interface between the light guide plate main body and the gas layer. With the image display device according to the present technology, it is possible to suppress an unnecessary image from entering the fields of view of an observer and a viewer of the observer.