Curved Spatial Light Modulator for Real-Time Holography
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Solution Overview
Problem
Existing holography reproducing methods require significant calculations for Fresnel transformation, making real-time generation and display of hologram images challenging due to the complexity of the process.
Innovation Solution
A holography reproducing apparatus and method that utilize a spatial light modulator with a concave-curved surface and a backlight emitting non-plane wave light with a curved wave front, both having a radius of curvature matching the distance to the eye lens, to reduce calculation requirements and simplify the optical system by eliminating the need for a field lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Fresnel transformation is used to generate hologram, then hologram image can be reproduced, but the amount of calculation required is large making real-time display difficult
Solution Approach 1:
The patent changes the curvature parameter of the spatial light modulator surface from flat to curved (concave), and adjusts the wavefront curvature parameter of the backlight to match the SLM curvature. This parameter change transforms the Fresnel transformation into a simpler transformation, dramatically reducing calculation complexity while maintaining hologram reproduction accuracy and enabling real-time display.
2Device complexity
If flat spatial light modulator and plane wave backlight are used, then optical system configuration is standard, but calculation complexity is high and field lens is required
Solution Approach 1:
The patent applies curvature to both the spatial light modulator surface and the backlight wavefront, creating a matched curved optical system. This curvature matching eliminates the need for field lens components and simplifies the transformation calculations, improving calculation efficiency while maintaining proper optical system configuration for hologram reproduction.
3Productivity
If curved surface spatial light modulator is used, then calculation amount is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent specifies that the curved surface radius of curvature should match the distance between the SLM and the coordinate plane in front of the eye lens. This parameter relationship simplifies the manufacturing process by providing a clear design criterion, making curved SLM fabrication more manageable while maintaining the calculation efficiency 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 approach significantly reduces the computational load for hologram generation, enabling real-time image reproduction and expanding the viewing angle to 180 degrees, thereby enhancing user immersion and simplifying the hardware configuration.
Implementation Method 1
a spatial light modulator configured to modulate light input from the backlight and transmit the modulated light to generate a transmissive hologram image
Implementation Method 2
a large amount of calculation is required when performing Fresnel transformation in the reproducing methods and apparatuses of the related art
Data Source
AI summary
A holography reproducing apparatus and a holography reproducing method are provided. The holography reproducing apparatus includes: a backlight configured to emit light, and a spatial light modulator configured to modulate light input from the backlight and transmit the modulated light to generate a transmissive hologram image, wherein at least one of a wave front of light emitted from the backlight and the spatial light modulator has a curved surface.