Transmissive Display Panel Beam Gating for Holographic Defocus Testing
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Solution Overview
Problem
The convergence quality of light beams in window holography is affected by errors in large-aperture optical systems, leading to defocused convergence points and aberrations in holographic imaging, which are costly to continuously measure and correct.
Innovation Solution
An imaging module comprising a lens and a transmissive display panel with a controller that loads white images on preset areas to maximize light transmission, while loading black images on other areas to block light, achieving beam gating and allowing all color light to pass without integrity loss, and a defocus testing method using a coherent point light source and test camera to determine and correct defocus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous measurement and correction of defocus is performed, then holographic imaging quality is improved, but cost increases
Solution Approach 1:
The patent uses a transmissive display panel to create a virtual copy of the light beam path, allowing defocus measurement without interfering with the actual holographic imaging process. The display panel displays a test pattern that replicates the optical path characteristics, enabling indirect measurement at low cost
Solution Approach 2:
The transmissive display panel acts as an intermediary device between the light beam and the measurement system. It mediates the measurement process by displaying test patterns that reveal defocus information without requiring direct intervention in the optical path, thereby reducing measurement cost while maintaining precision
2Manufacturing precision
If beam gating is implemented to improve convergence quality, then imaging quality is improved, but device complexity increases
Solution Approach 1:
The transmissive display panel serves multiple functions: it acts as a beam gate to control light transmission, a test pattern generator for defocus measurement, and a virtual reality display interface. This multi-functionality reduces the need for separate dedicated components, thereby lowering overall device complexity while maintaining beam gating capability for improved convergence quality
Solution Approach 2:
The patent merges the beam gating function with the display function by using the same transmissive display panel for both purposes. Instead of having separate beam gating apertures and display elements, the display panel itself performs both light transmission control and information display, simplifying the overall system structure
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 solution enables effective beam gating and accurate defocus determination, improving holographic imaging quality by minimizing light beam aberrations and reducing the cost of continuous measurement and correction.
Implementation Method 1
a lens and a transmissive display panel disposed adjacent to each other
Implementation Method 2
the coherent point light source is formed by the convergence of the light beam
Implementation Method 3
the controller loading a white image on a preset area of the transmissive display panel so that a light beam passes through the preset area
Implementation Method 4
the test camera is configured to receive a light beam converged by the leans and gated by the transmissive display panel
Data Source
AI summary
An imaging module, including a lens and a transmissive display panel disposed adjacent to each other, and a controller electrically connected to the transmissive display panel, the controller loading a white image on a preset area of the transmissive display panel so that a light beam passes through the preset area. A light beam gating control method, a testing apparatus and method for an imaging module are further provided.