Planar Optical Replication Component Ghost Image Suppression
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Solution Overview
Problem
Existing optical replication components in smart glasses often result in ghost images due to light beams striking the back side, which can cause visibility issues for users.
Innovation Solution
A planar optical replication component with a first and second holographic optical element and an additional optical filter element that filters specific light beams, preventing ghost images by reflecting or absorbing light within specific angle, wavelength, and polarization ranges, thereby enhancing transparency and image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a planar optical replication component with multiple holographic optical elements is used to produce multiple exit pupils, then the effective eye box is enlarged and image content can be displayed to multiple eyes simultaneously, but light beams striking the back side at specific angles cause ghost images that reduce visibility
Solution Approach 1:
The patent applies the principle of converting harm into benefit by using the harmful back-side reflected light beams to create the optical filter element. This filter element is specifically designed to block the ghost image-forming light beams that strike the back side at specific angles, while allowing the useful light beams to pass through. By converting the harmful factor (back-side reflected light) into a functional element (optical filter), the patent eliminates ghost images while maintaining the enlarged eye box benefit.
Solution Approach 2:
The patent introduces an intermediary element - the optical filter element - between the back side of the optical replication component and the user's eye. This intermediary filter selectively blocks harmful light beams (those that would create ghost images) while allowing useful light beams to pass through. The filter element acts as a mediator that resolves the contradiction by selectively removing the harmful factor without affecting the beneficial function of the holographic optical elements.
2Object-affected harmful factors
If an optical filter element is added to block ghost images, then visibility and image clarity are improved, but the device complexity increases
Solution Approach 1:
The patent applies the merging principle by combining the optical filter element with the existing holographic optical elements into a single integrated planar optical replication component. Rather than adding a separate, bulky filter system, the filter is integrated into the same planar structure, allowing multiple functions (holographic image display and ghost image suppression) to be achieved in a single compact component. This merging approach minimizes the increase in device complexity while maintaining the benefits of both functions.
Solution Approach 2:
The patent implements multi-functionality by designing the optical replication component to perform multiple functions simultaneously: the holographic optical elements display image content to multiple eyes, while the integrated optical filter element suppresses ghost images. This universal design allows a single component to address both the beneficial function (enlarged eye box) and the harmful effect (ghost image suppression), thereby minimizing the need for additional separate components and 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
The solution effectively prevents ghost images by filtering out light that would otherwise cause these issues, ensuring clear and transparent vision for the user while maintaining sufficient intensity and transparency.
Implementation Method 1
The first holographic optical element and the second holographic optical element are designed to reflect an image content striking the front side of the optical replication component in such a way that at least a first and a second exit pupil, which is situated spatially offset with respect to the first, are produced with the image content
Implementation Method 2
The optical replication component comprises an additional optical filter element for filtering at least a first light beam striking the back side of the optical replication component in a specific angle of incidence range and/or a specific wavelength range and/or with a specific polarization direction
Data Source
AI summary
An optical replication component, which is developed in planar fashion and has a front side and a back side. The optical replication component includes at least a first holographic optical element and a second holographic optical element. The first holographic optical element and the second holographic optical element are designed to reflect an image content striking the front side of the optical replication component in such a way that a first exit pupil and a second exit pupil situated spatially offset with respect to the first are produced with the image content. The optical replication component has an additional optical filter element for filtering at least a first light beam striking the back side of the optical replication component in a specific angle of incidence range and/or a specific wavelength range and/or with a specific polarization direction.