Laser Display Screen With Optical Transmission Tubes
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Solution Overview
Problem
Conventional laser display apparatuses face challenges in reducing speckle noise while maintaining image sharpness, particularly due to the complexity and size limitations of existing speckle reduction systems, which hinder downsizing and application in both large and small-sized devices.
Innovation Solution
A screen design featuring a pair of diffusion plates spaced apart with optical transmission tubes containing optical fibers to transfer laser light, reducing speckle noise and enhancing sharpness without additional elements, allowing for application in both large and small laser display apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional elements for reducing speckles are included in the laser display apparatus, then speckle noise is reduced, but the overall size of the apparatus is increased and the optical system structure becomes complex
Solution Approach 1:
The patent introduces a screen as an intermediary component between the laser light source and the display surface. The screen includes a light blocking layer with light blocking particles and a resin layer, which together act as a mediator to reduce speckle noise by scattering and blocking coherent laser light while maintaining image quality. This intermediary structure eliminates the need for complex optical elements typically required for speckle reduction.
2Object-affected harmful factors
If conventional elements for reducing speckles are included in the laser display apparatus, then speckle noise is reduced, but the overall size of the apparatus is increased
Solution Approach 1:
The screen serves as a compact intermediary that integrates speckle reduction functionality directly into the display structure. By incorporating light blocking particles within the resin layer of the screen, the patent achieves speckle noise reduction without requiring additional external optical components, thereby maintaining a compact apparatus size suitable for both large and small-scale laser display applications.
3Illumination intensity
If a laser light source is used to achieve high color purity, then natural colors are realized, but grain-shaped speckles are generated on the screen due to laser coherency
Solution Approach 1:
The patent converts the harmful effect of laser coherency (which causes speckles) into a beneficial function. By strategically positioning light blocking particles within the resin layer at specific depths and concentrations, the coherent laser light is scattered and blocked in a controlled manner. This transforms the problematic coherence into an advantage, as the structured scattering pattern enhances the light blocking effect while maintaining image sharpness and color purity.
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 proposed screen effectively reduces speckle noise and enhances image sharpness by using optical transmission tubes with optical fibers between diffusion plates, enabling efficient speckle reduction and maintaining image quality across various device sizes.
Implementation Method 1
at least one optical fiber arranged in the through hole to transfer the laser light
Implementation Method 2
a first diffusion plate for transmitting a laser light for image display; a second diffusion plate spaced apart a preset distance from the first diffusion plate
Data Source
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AI summary
There is disclosed a screen including a first diffusion plate for transmitting a laser light for image display, a second diffusion plate spaced apart a preset distance from the first diffusion plate, and a plurality of optical transmission tubes arranged between the first diffusion plate and the second diffusion plate to transfer the laser light transmitted from the first diffusion plate to the second diffusion plate, wherein the optical transmission tube includes a body portion comprising a first surface facing the first diffusion plate and a second surface facing the second diffusion plate, vided in the body portion to a central region of the second surface provided in the body portion, and at least one optical fiber arranged in the through hole to transfer the laser light, only to reduce speckle noise of laser, and a laser display apparatus using the same.