Digital Hologram Construction Using Correction Coefficients for Wider Field of View
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Solution Overview
Problem
Existing digital holography systems have limited field of vision due to the emission angle being directly linked to the density of pixels of the light modulator, which is insufficient for applications like augmented reality where a larger field of view is required.
Innovation Solution
A process for building a digital hologram that includes determining pixel values by summarizing light contributions from light elements with weighting, using a correction coefficient dependent on the area of intersection between a convergent optical device and a focal point, and a light brush with a predetermined angular opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a light modulator with high pixel density is used to increase the emission angle, then the field of vision is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
A compensating optical element is introduced as an intermediary component between the light modulator and the observer's eye. This element compensates for the limited emission angle by redirecting light rays, effectively decoupling the field of vision from the pixel density requirements of the light modulator.
Solution Approach 2:
The patent changes the optical parameters of the system by introducing a compensating element with specific refractive properties and geometric configuration. This element modifies the light propagation paths and angular distribution, enabling a larger field of vision without increasing the light modulator's pixel density.
2Area of stationary object
If a converging optical device is used to widen the field of vision, then the field of vision is improved, but light rays are partially intercepted causing loss of information
Solution Approach 1:
The compensating optical element is designed and positioned in advance to pre-compensate for the light ray interception that will occur with the converging optical device. By calculating the expected interception patterns beforehand, the compensating element is configured to redirect the specific light rays that would otherwise be blocked, preserving the complete light information.
Solution Approach 2:
The patent employs a feedback mechanism where the actual light ray interception by the converging optical device is measured or calculated, and this information is used to optimize the configuration of the compensating optical element. This ensures that the compensating element is precisely tuned to counteract the specific interception patterns, minimizing information loss.
3Area of stationary object
If the observer's eye is placed close to the focal point to maximize field of vision, then the field of vision is improved, but the position stability and ease of operation decrease
Solution Approach 1:
The compensating optical element serves as a mediator that creates a virtual image or expanded viewing zone, allowing the observer to access a wider field of vision from multiple positions. This eliminates the need for the eye to be precisely positioned at the focal point, as the compensating element distributes the light information across a broader spatial region.
Solution Approach 2:
The patent extends the viewing capability from a single-point focal position to a multi-dimensional viewing volume. By using the compensating optical element to redistribute light rays, the system creates an extended virtual display space that can be accessed from multiple eye positions, effectively adding spatial degrees of freedom to the viewing experience.
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 proposed solution enhances the reproduction of a three-dimensional scene by accounting for partial reception of light rays by the observer's pupil, thereby improving the field of view and the overall display system's performance.
Implementation Method 1
a converging optical device designed to converge the light beam towards a focal point
Implementation Method 2
a light modulator producing a light beam
Implementation Method 3
the correction coefficient depending on the area of the intersection of a surface located between the converging optical device and the focal point, and a light beam having a predetermined angular aperture and transmitted through the converging optical device from the light element
Data Source
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AI summary
The invention relates to a method for constructing a digital hologram representing a scene and intended to be displayed by means of a display system (10). The display system (10) comprises a light modulator (12) producing a light beam as and a convergent optical device (14) designed to make the light beam converge towards a focal point (A). The scene is defined by a set of light elements. The construction method comprises a step of determining values respectively associated with the pixels of the digital hologram by summing the light contributions respectively produced by the light elements with weighting, for each of the light contributions, by a correction coefficient depending on the area of the intersection (ε) of a surface (δ) located between the convergent optical device (14) and the focal point (A), and a pencil beam (φ) having a predetermined angular opening (ω) and transmitted through the convergent optical device (14) from the light element producing the light contribution concerned. An associated holographic system is also described.