Light Guide Optical System for AR Glasses Angle-of-View Extension
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Solution Overview
Problem
Image display apparatuses, such as AR glasses, face challenges in achieving both weight reduction and wider angle-of-view due to the configuration of light guide plates, where thinner plates lead to light loss and increased production difficulties for hologram elements.
Innovation Solution
Incorporating a polarization beam splitter unit on one surface and a polarization state converting unit on the other surface of the light guide plate, which reflects and converts the polarization state of image display light to prevent light loss and extend the angle-of-view, while allowing the light to concentrate near the pupil for effective retinal projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the light guide plate is thinned to reduce weight, then the weight of the image display apparatus is reduced, but light loss occurs and the angle-of-view cannot be extended
Solution Approach 1:
The patent changes the polarization state parameter of light through the polarization state converting unit, transforming light that would otherwise be lost into usable illumination light, thereby enabling thinner light guide plates without sacrificing light efficiency
Solution Approach 2:
The polarization state converting unit acts as an intermediary component that converts the polarization state of image display light, enabling the light to be effectively utilized for illumination and preventing light loss even in thinned light guide plate configurations
2Weight of moving object
If the light guide plate is thinned to reduce weight, then the weight of the image display apparatus is reduced, but the angle-of-view cannot be extended
Solution Approach 1:
By changing the polarization state of light through the polarization state converting unit, the system enables broader light distribution angles, thereby extending the angle-of-view even with thinned light guide plates
3Device complexity
If a conventional light guide optical system is used, then the structure is simple, but light loss occurs and angle-of-view extension is difficult
Solution Approach 1:
The patent introduces a polarization state converting unit that changes the polarization parameter of light, transforming wasted light into useful illumination light, thereby improving light efficiency with minimal additional structural complexity
Solution Approach 2:
The polarization state converting unit serves multiple functions: it converts polarization states, prevents light loss, enables angle-of-view extension, and maintains compatibility with existing light guide plate structures, demonstrating multi-functionality
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 configuration enhances the angle-of-view and reduces the weight of the image display apparatus by preventing light loss and allowing for effective image display even with thinner light guide plates, improving the overall performance of the retinal projection technology.
Implementation Method 1
a polarization beam splitter unit arranged on a first surface of the light guide plate
Implementation Method 2
a polarization state converting unit arranged on a second surface of the light guide plate, in which the polarization state converting unit reflects image display light that has passed through the polarization beam splitter unit and enters the light guide plate and converts a polarization state of the image display light
Implementation Method 3
a light guide plate; a polarization beam splitter unit arranged on a first surface of the light guide plate
Data Source
AI summary
To achieve angle-of-view extension in an image display apparatus including a light guide plate. The present disclosure provides an image display apparatus including: a light guide plate; a polarization beam splitter unit arranged on a first surface of the light guide plate; and a polarization state converting unit arranged on a second surface of the light guide plate, in which the polarization state converting unit reflects image display light that has passed through the polarization beam splitter unit and entered the light guide plate and converts a polarization state of the image display light into a polarization state to be reflected by the polarization beam splitter unit at the time of reflection.