Holographic Driver Rectangular Fourier Transform
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Solution Overview
Problem
Holographic projectors face issues with artifacts such as dark areas or bands in the virtual surface when replicating the Fourier transform of a hologram, which affect the viewing experience, and they often require a large optical axis and long focal length, making them bulky and inefficient, particularly in compact applications like head-up displays.
Innovation Solution
A driver for a display device that arranges the hologram to have a shape with a high packing density, such as a non-circular shape, to minimize dark bands and allows for a compact optical system by positioning the holographic reconstruction close to the display device, using a smaller number of pixels to maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional circular shape is used for the Fourier transform of the hologram, then the holographic reconstruction can be formed, but dark bands and artifacts appear in the virtual surface reducing image quality
Solution Approach 1:
The patent applies asymmetry by changing the shape of the Fourier transform of the hologram from a conventional circular shape to a rectangular shape. This asymmetric geometric transformation eliminates the dark bands and artifacts that appear in the virtual surface, thereby improving image quality without requiring additional optical components.
2Manufacturing precision
If a large optical axis and long focal length are used to form the holographic reconstruction, then the image quality can be maintained, but the projector becomes bulky and unsuitable for compact applications
Solution Approach 1:
The patent changes the geometric parameter of the hologram shape from circular to rectangular, which fundamentally alters the diffraction pattern and allows the holographic reconstruction to be formed with a compact optical system. This parameter change enables high image quality to be achieved without requiring a large optical axis or long focal length, making the projector suitable for compact applications like head-up displays.
3Volume of moving object
If fewer pixels are used in the display device, then the system size can be reduced, but image quality may deteriorate
Solution Approach 1:
The rectangular shape of the Fourier transform of the hologram creates a more efficient pixel utilization pattern compared to the conventional circular shape. This asymmetric geometry allows the display device to achieve the same or better image quality with fewer pixels, thereby reducing the overall system size while maintaining high manufacturing precision.
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 reduces the visual impact of artifacts, enables a compact holographic projector design suitable for head-up displays, and maintains good image quality with fewer pixels, improving the viewing experience and reducing system size.
Implementation Method 1
The display device is arranged to spatially modulate light in accordance with a hologram of a picture displayed thereon
Implementation Method 2
The first waveguide may replicate that light to expand an exit pupil of the optical system in a first direction
Implementation Method 3
A virtual image of the holographic reconstruction is visible when a viewing system (such as the eye of a user) is positioned at a viewing window downstream of the waveguide/s
Data Source
AI summary
A driver for a display device includes a plurality of pixels. The driver is arranged to drive the display device to display a hologram of a picture on the plurality of pixels such that, when the display device is suitably illuminated, a holographic reconstruction of the picture is formed downstream of the display device. The holographic reconstruction includes a plurality of image points. The hologram is arranged such that each image point of the holographic reconstruction is formed using a contiguous group of pixels of the display device. Each contiguous group of pixels includes less than 5% of a total number of pixels of the display device.