Holographic Display System Using Segmented Subframes for AR HUD
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Solution Overview
Problem
Current holographic display systems for motor vehicles face challenges in enhancing the resolution of reconstructed images and enlarging the eyebox size without increasing the cost, weight, and complexity by using multiple spatial light modulators.
Innovation Solution
A holographic display system that includes a light source, a spatial light modulator with a two-dimensional pixel array encoded with holograms, and a computer processor to generate subframes for a full field of view, where the subframes are tiled or angularly dithered onto sections of a display surface, resulting in a higher total image resolution and larger eyebox size than the SLM resolution and eyebox size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the resolution of the SLM is increased to enhance the resolution of reconstructed images and enlarge the eyebox size, then the image resolution and eyebox size are improved, but the cost, weight, and complexity of the AR HUD increase
Solution Approach 1:
The patent divides the field of view into multiple partial fields of view, with each subframe corresponding to a different partial field of view. The SLM displays multiple subframes sequentially, and the display surface is divided into multiple sections that collectively form the full field of view. This segmentation allows the system to achieve high total image resolution across the full field of view without requiring the SLM itself to have extremely high resolution, thereby reducing cost and complexity.
2Area of stationary object
If multiple SLMs are used to increase the viewing zone angle and screen size, then the field of view and eyebox size are improved, but the cost, weight, and complexity of the AR HUD increase
Solution Approach 1:
The patent segments the field of view into multiple partial fields of view and uses a single SLM to display multiple subframes corresponding to different sections of the display surface. This approach achieves an enlarged eyebox size and expanded field of view without requiring multiple SLMs, thereby maintaining lower system complexity and cost while still meeting the requirement for larger eyebox size.
3Manufacturing precision
If the resolution of the SLM is increased to provide commensurate resolution for the AR HUD, then the image resolution is improved, but the cost and weight of the system increase
Solution Approach 1:
The patent uses a single SLM to display multiple subframes that are sequentially directed to different sections of the display surface. Each subframe corresponds to a partial field of view, and the combination of subframes creates the full field of view with high total image resolution. This approach achieves high image resolution without requiring an expensive, heavy high-resolution SLM, thereby reducing system weight.
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 achieves a higher total image resolution and larger eyebox size than the spatial light modulator's capabilities, enhancing the viewing experience without increasing the system's complexity or cost by effectively stitching or dithering subframes to create a more comprehensive field of view.
Implementation Method 1
a spatial light modulator (SLM) with a two-dimensional pixel array with an SLM resolution, encoded with holograms diffracts the coherent light
Implementation Method 2
The processor is coupled to the SLM and programmed to control the scanner to direct the subframes onto an associated one of the sections of the display surface
Data Source
AI summary
A holographic display system for a motor vehicle includes a light source for generating a beam of coherent light and a spatial light modulator (SLM) having a two-dimensional pixel array. The two-dimensional pixel array modulates the beam of coherent light for generating a plurality of subframes, with each subframe being associated with one of a plurality of partial fields of view. The system further includes a scanner for directing the subframes onto associated sections of a display surface. The system further includes a computer having a memory including instructions, such that a processor is programmed to control the two-dimensional pixel array of the SLM for generating the subframes. The processor is further programmed to control the scanner for directing the subframes onto associated sections of the display surface and displaying a reconstructed image within a full field of view, which includes each of the partial fields of view.