Vehicle Holographic Display Phase Correction for Speckle Noise
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Solution Overview
Problem
Holographic display systems in motor vehicles face reduced image quality due to graphics speckle noise, which existing solutions like optical diffusers cannot effectively address, especially in compact Augmented Reality Head-Up Displays (ARHUDs) and systems projecting phase holograms directly to users.
Innovation Solution
A holographic display system that includes a light source, spatial light modulator, beam splitter, and camera, with a computer processing unit that generates a corrective holographic phase shift signal to reduce speckle noise by modifying the phase of coherent light in real-time, using parameters such as iteration count, entropy, and variance metrics to minimize noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an optical diffuser is used to reduce speckle noise, then image quality is improved, but device complexity and power consumption increase due to motorized components
Solution Approach 1:
The patent replaces the mechanical/optical diffuser system with a computational approach using a camera to capture speckle patterns and a processor to generate corrective phase shifts. This substitutes physical mechanical components with electronic processing, reducing device complexity and power consumption while maintaining speckle reduction effectiveness.
Solution Approach 2:
The patent introduces a camera as an intermediary device to capture the intermediate image and speckle patterns. This intermediary enables the system to measure and analyze speckle noise without requiring physical diffusers, allowing for computational correction instead of mechanical intervention.
2Manufacturing precision
If an optical diffuser is used to reduce speckle noise, then image quality is improved, but the system size increases making it incompatible with compact ARHUDs
Solution Approach 1:
The patent eliminates the need for bulky optical diffusers by replacing them with a compact camera and computational processing system. This substitution dramatically reduces the volume required for speckle reduction functionality, making the system compatible with compact ARHUD designs.
Solution Approach 2:
The patent uses a camera to create a digital copy of the intermediate image and speckle patterns. This optical-to-digital copying allows the system to analyze and correct speckle noise computationally without requiring physical space for optical diffusers, enabling compact system design.
3Manufacturing precision
If an optical diffuser is used to reduce speckle noise, then image quality is improved, but the system cannot be used for direct phase hologram projection to users' eyes
Solution Approach 1:
The patent replaces the optical diffuser with a computational correction system that can be applied to any holographic projection method. This substitution removes the physical constraint that prevented direct phase hologram projection, allowing the system to work with both conventional and direct phase projection methods.
Solution Approach 2:
The patent changes the approach from physical optical manipulation to computational parameter adjustment. By calculating and applying corrective phase shifts based on captured speckle patterns, the system adapts to different projection methods including direct phase hologram projection to users' eyes, significantly improving system versatility.
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 system effectively decreases graphics speckle noise in real-time, improving image quality without the need for motorized components or optical diffusers, ensuring smooth and consistent holographic displays even in compact ARHUDs.
Implementation Method 1
The SLM modifies in real-time a holographic phase of the beam of coherent light per pixel
Implementation Method 2
a spatial light modulator (SLM) having a display with a hologram generating unit and a plurality of pixels for modulating the beam of coherent light
Implementation Method 3
a beam splitter for splitting the beam of coherent light into an object beam and an intermediate image beam
Implementation Method 4
a camera for capturing the intermediate image, in response to the camera receiving the intermediate image beam from the beam splitter
Implementation Method 5
a light source for generating a beam of coherent light
Data Source
AI summary
A holographic display system provides a maximum intensity value of an intermediate image to decrease a graphics speckle noise. The system includes an SLM having a display with a hologram generating unit and a plurality of pixels for modulating a beam of coherent light. The system further includes a beam splitter for splitting the beam into an object beam and an intermediate image beam that is associated with an intermediate image having the noise. The system further includes a camera for capturing the intermediate image, in response to the camera receiving the intermediate image beam. The system further includes a computer having a processor and a CRM. The processor is programmed to generate an actuation signal associated with a corrective holographic phase shift to decrease the noise. The SLM modifies in real-time a holographic phase of the beam per pixel, in response to the SLM receiving the actuation signal.