Holographic Projection Using Multi-Angle Spatial Light Modulation
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Solution Overview
Problem
Two-dimensional holographic projection systems based on phase modulation devices face limitations due to spatial and frequency domain restrictions, resulting in square-shaped projection regions that are incompatible with typical rectangular viewing habits, leading to oversampling and waste of computing resources.
Innovation Solution
A method and apparatus that utilize a spatial light modulator with multiple modulating parts illuminated at different incident angles to form overlapping or abutting projection regions, which are then stitched to create a composite imaging region of a substantially rectangular shape, optimizing resource usage and viewer compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Fast Fourier Transform algorithm is used for two-dimensional holographic projection, then image coding can be calculated and two-dimensional image can be formed, but spatial domain restrictions and frequency domain restrictions cause strict correspondence relationship leading to square-shaped projection regions that waste computing resources
Solution Approach 1:
The spatial light modulator is divided into multiple independent modulating parts (first modulating part and second modulating part), each processing a separate projection region. This segmentation allows each part to be optimized independently, breaking the constraint that forces a square-shaped overall projection region and enabling rectangular-shaped regions that match typical display aspect ratios, thereby improving computing resource efficiency
Solution Approach 2:
The patent introduces the dimension of incident angle variation, illuminating different modulating parts at different incident angles (first incident angle and second incident angle). This dimensional change in illumination geometry enables the stitching together of multiple projection regions to form a larger rectangular-shaped composite imaging region, overcoming the square-shaped limitation of traditional single-angle illumination
2Area of stationary object
If single incident angle illumination is used, then simple optical path is maintained, but projection region size is limited and cannot match rectangular viewing habits
Solution Approach 1:
The illumination system employs dynamic adjustment of incident angles, switching between first incident angle for first modulating part and second incident angle for second modulating part. This dynamic illumination approach enables the system to expand the composite imaging region area to match rectangular viewing habits while maintaining manageable optical path complexity through controlled variable illumination conditions
3Adaptability or versatility
If multiple modulating parts are illuminated at different incident angles, then rectangular composite imaging region is formed matching viewer preferences, but optical path complexity increases
Solution Approach 1:
Different modulating parts of the spatial light modulator are illuminated with different incident angles tailored to their specific functions. The first modulating part receives light at the first incident angle optimized for its region, while the second modulating part receives light at the second incident angle optimized for its region. This local quality approach enables rectangular composite imaging region formation that matches viewer preferences while managing optical path complexity through localized optimization rather than global 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 generates a rectangular composite imaging region that aligns with viewer preferences, reducing computational waste and enhancing the space-bandwidth product efficiency of the spatial light modulator.
Implementation Method 1
illuminating a first modulating part of a spatial light modulator with a first incident light beam at a first incident angle with respect to a direction normal to a main surface of the spatial light modulator to form a first projection region on an imaging plane; and illuminating a second modulating part of the spatial light modulator with a second incident light beam at a second incident angle
Implementation Method 2
Most of the two-dimensional holographic projection apparatuses based on phase modulation device use Fast Fourier Transform algorithm
Data Source
AI summary
A two-dimensional holographic image projection display method. The method includes illuminating a first modulating part of a spatial light modulator with a first incident light beam at a first incident angle with respect to a direction normal to a main surface of the spatial light modulator to form a first projection region on an imaging plane; and illuminating a second modulating part of the spatial light modulator with a second incident light beam at a second incident angle with respect to the direction normal to the main surface of the spatial light modulator to form a second projection region on the imaging plane. The first projection region abuts or partially overlaps with the second projection region at an interface substantially parallel to a lateral direction of the spatial light modulator.