Holographic Optical Layout for Zero-Order Light Suppression
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Solution Overview
Problem
Existing 3D display technologies struggle with efficient suppression of display zero order light, which interferes with the holographic scene and degrades image quality.
Innovation Solution
The use of optical devices with in-coupling and out-coupling diffractive structures, combined with color-selective polarizers and reflective layers, to separate and redirect display zero order light away from the holographic scene, while maintaining high image quality and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional display elements are used for holographic reconstruction, then the display can generate holographic scenes, but display zero order light (reflected light from display elements and gaps) interferes with the holographic scene and degrades image quality
Solution Approach 1:
The patent extracts and removes the harmful display zero order light from the holographic scene using optical components. Specifically, a first polarizer is positioned to block reflected light from display elements, and a second polarizer is positioned to block reflected light from gaps between display elements, thereby separating the harmful zero order light from the desired holographic information light.
Solution Approach 2:
The patent introduces optical intermediary components (polarizers and waveplates) between the display and the viewer's eye. These intermediaries selectively transmit or block specific light paths - allowing holographic information to pass while blocking zero order light, thus mediating the interaction between the display and the observer without direct contact.
2Manufacturing precision
If multiple optical components are added to suppress display zero order light, then image quality improves, but device complexity increases
Solution Approach 1:
The patent designs optical components that perform multiple functions simultaneously. For example, the polarizers not only block zero order light but also work together with the waveplates to control the polarization state of holographic information light. This multi-functionality reduces the need for separate dedicated components for each function, thereby managing complexity while improving image quality.
Solution Approach 2:
The patent utilizes changes in optical parameters (polarization angle, waveplate orientation) to achieve different suppression effects. By adjusting the orientation angles of polarizers and waveplates, the system can optimize zero order light blocking while maintaining holographic image quality, providing a flexible approach that manages complexity through parameter optimization rather than adding more components.
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
Effectively suppresses display zero order light, enhancing the signal-to-noise ratio and improving the overall performance of 3D holographic displays by maintaining high image quality and efficiency.
Implementation Method 1
an in-coupling diffractive structure configured to diffract the light to propagate in the optical guiding device; and a plurality of out-coupling diffractive structures arranged downstream of the in-coupling diffractive structure along the first direction and configured to diffract at least part of the light out of the optical guiding device along a second direction different from the first direction
Implementation Method 2
one or more reflective layers configured to totally reflect a single color of light and transmit one or more other colors of light such that each color of light is diffracted out by a corresponding optically diffractive component along the second direction
Implementation Method 3
one or more color-selective polarizers configured to change a polarization state of the display zero order light such that the display zero order light is blocked by the linear polarizer
Data Source
AI summary
Methods, apparatus, devices, subsystems, and systems for holographically displaying three-dimensional objects are provided. In one aspect, an optical device includes: a first optically diffractive component including a first diffractive structure configured to diffract a first color of light having a first incident angle at a first diffracted angle, a second optically diffractive component including a second diffractive structure configured to diffract a second color of light having a second incident angle at a second diffracted angle, a first reflective layer configured to totally reflect the first color of light having the first incident angle and transmit the second color of light, and a second reflective layer configured to totally reflect the second color of light having the second incident angle. The first reflective layer is between the first and second diffractive structures, and the second diffractive structure is between the first and second reflective layers.