Holographic Mastering via Light Interference for HUD Displays
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Solution Overview
Problem
The high cost and inefficiency of conventional holographic mastering processes for producing large Field of View (FOV) displays, particularly in Head Up Displays (HUDs) and Head Mounted Displays (HMDs), due to the need for multiple master components and limited control over diffraction efficiency and geometrical optical characteristics.
Innovation Solution
A method for replicating holograms with a multiplicity of prescriptions from a single master hologram, involving the stacking of substrates with holograms that diffract light into zero-order and diffracted light, which interfere to form intermediate and final holograms, allowing for precise control of refractive index modulation and beam ratios through voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional holographic mastering processes are used to produce large FOV displays, then holograms can be manufactured, but the process is costly and inefficient due to requiring multiple master components
Solution Approach 1:
The patent combines multiple master components into a single integrated master hologram that can generate multiple intermediate holograms with different prescriptions simultaneously, eliminating the need for separate master components and streamlining the production process
Solution Approach 2:
A single master hologram is designed to perform multiple functions by generating various intermediate holograms with different optical prescriptions, allowing one master to serve multiple purposes and reduce the overall number of components needed
2Manufacturing precision
If conventional holographic mastering processes are used, then holograms can be produced, but control over diffraction efficiency and geometrical optical characteristics is limited
Solution Approach 1:
The patent introduces voltage-controlled switching capability in the intermediate holograms, allowing dynamic adjustment of diffraction efficiency and optical characteristics during operation, providing precise control without complicating the manufacturing process
Solution Approach 2:
The patent utilizes electrical voltage as a controllable parameter to modulate the optical properties of the holograms, enabling precise control over diffraction efficiency and beam ratios by changing the electrical state rather than requiring complex manufacturing adjustments
3Adaptability or versatility
If multiple master components are used for large FOV displays, then comprehensive optical prescriptions can be achieved, but the cost increases significantly
Solution Approach 1:
The patent segments the optical functionality into a single master hologram that generates multiple intermediate holograms, each handling specific angular bands or prescriptions, thereby achieving comprehensive coverage without requiring multiple separate master components
Solution Approach 2:
The patent adds an angular dimension to the holographic system by using multiple intermediate holograms at different orientations and positions, allowing a single master to produce a wide field of view through angular multiplexing rather than requiring multiple masters
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 method enables efficient and cost-effective production of holograms with a wide range of optical prescriptions, reducing the number of required master components and improving control over diffraction efficiency and beam ratios, thus addressing the limitations of conventional processes.
Implementation Method 1
providing N substrates each containing a first hologram for diffracting incident light from a first direction into diffracted light in a second direction
Implementation Method 2
the first direction light and the second direction light interfering in the second holographic recording medium to form a second hologram
Implementation Method 3
the second hologram diffracting the light into zero order light in the first direction and diffracted light in the second direction
Implementation Method 4
the diffracted and first order light interfering in the third holographic recording medium to form a third hologram
Data Source
AI summary
A method for producing holograms with a multiplicity of holographic prescriptions from a single master is provided. A multiplicity of holographic substrates each having a first hologram is stacked on a second holographic recording medium substrate. The first hologram is designed to diffract light from a first direction into a second direction. When expose to illumination from the first direction zero order and diffracted light from each first hologram interfere in the second holographic recording medium substrate forming a second hologram. The second hologram is then copied into a third holographic recording medium substrate to provide the final copy hologram.