Light Guide Plate With Integral Holographic Elements
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Solution Overview
Problem
Existing display apparatuses face challenges in suppressing unnecessary light generation and high manufacturing costs, particularly in augmented reality technologies like head-mounted displays, where light from the device can be distracting and costly to manage.
Innovation Solution
The proposed solution involves a display apparatus with a collimating optical system, a light guide plate, and multiple second optical elements that are integral with the light guide plate, using reflective or transmissive volume holograms to control light propagation and reduce unwanted light emission, while being manufactured with the same material through integral molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional display technologies are used, then image display functionality is achieved, but unnecessary light generation cannot be suppressed
Solution Approach 1:
The patent divides the optical system into multiple functional components: a light guide plate, multiple second optical elements (holograms) positioned at different locations, and a first optical element. This segmentation allows different regions to control light propagation separately, enabling suppression of unnecessary light while maintaining image display quality through coordinated operation of these segmented components.
Solution Approach 2:
The patent introduces a light guide plate as an intermediary component between the light source and the viewer's eyes. This intermediary guides the necessary image display light while the second optical elements act as additional intermediaries to redirect or suppress unnecessary light, thereby resolving the contradiction between maintaining image quality and reducing harmful light generation.
2Object-affected harmful factors
If complex optical systems are used to suppress unnecessary light, then light control improves, but manufacturing costs increase
Solution Approach 1:
The patent merges the light guide plate and the second optical elements into a single integrated structure. The second optical elements are formed on the light guide plate using integral molding, combining multiple functional components into one manufacturable unit. This merging reduces assembly complexity and manufacturing costs while maintaining the optical functionality needed to suppress unnecessary light.
Solution Approach 2:
The patent utilizes parameter changes in the optical path by positioning multiple second optical elements at different locations and orientations on the light guide plate. By adjusting these positional and angular parameters, the system achieves effective suppression of unnecessary light through controlled light propagation paths without requiring complex additional components, thereby maintaining ease of manufacture.
3Manufacturing precision
If multiple separate optical elements are used, then light control precision improves, but device complexity increases
Solution Approach 1:
The patent combines multiple second optical elements and the light guide plate into a single integrated component formed by integral molding. This merging maintains the functional benefits of having multiple optical elements positioned at different locations for precise light control, while eliminating the complexity of assembling and aligning separate components, thus reducing device complexity.
4Ease of manufacture
If integral molding is used, then manufacturing cost decreases, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs parameter optimization in the design of the second optical elements, positioning them at specific locations and orientations on the light guide plate. These carefully selected parameters allow the integral molding process to achieve the required optical functionality without demanding excessively tight manufacturing tolerances, thereby balancing manufacturing precision requirements with cost reduction benefits.
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 effectively suppresses unnecessary light emission to the wearer, reduces manufacturing costs, and provides a deep-depth video display with focus-free functionality, enhancing user experience and cost efficiency.
Implementation Method 1
a light guide plate on which light emitted from the collimating optical system is incident and that totally reflects and guides the light being incident
Implementation Method 2
multiple second optical elements that are disposed on the light guide plate and emit light propagated by total reflection in the light guide plate to outside of the light guide plate
Data Source
AI summary
A display apparatus that includes an image display element, a collimating optical system that collimates light emitted from the image display element, a light guide plate on which light emitted from the collimating optical system is incident and that totally reflects and guides the light being incident, a first optical element that is disposed on the light guide plate and introduces the light being incident into the light guide plate, and multiple second optical elements that are disposed on the light guide plate and emit light propagated by total reflection in the light guide plate to outside of the light guide plate. The display apparatus is capable of suppressing generation of light (unnecessary light) other than light (image display light) to a wearer and suppressing manufacturing costs of the display apparatus.