Multilayered Fluorescent Screen for Compact Scanning Beam Displays
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Solution Overview
Problem
Conventional display technologies, such as CRTs, face limitations due to the use of cathode-ray tubes, leading to a decline in demand, and existing display systems either rely on optical lens systems for image projection or have larger form factors due to the need for color image production.
Innovation Solution
The development of fluorescent screens that utilize a planar stack of layers including a fluorescent layer and a prismatic layer to absorb excitation light and emit visible light, eliminating the need for optical lens systems and enabling more compact designs by directly producing color images through fluorescent materials like phosphors or quantum dots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If optical lens systems are used for image projection, then image quality can be maintained, but the system size and complexity increase
Solution Approach 1:
The patent extracts and eliminates the optical lens system from the display architecture by using a direct-view fluorescent screen that converts excitation light directly into visible color images without requiring projection optics. This removes the complex optical path while maintaining image quality through the fluorescent conversion mechanism.
Solution Approach 2:
The patent replaces the mechanical optical lens system with a photonic fluorescent conversion layer. Instead of using lenses to focus and project light, the system uses fluorescent materials to directly convert excitation light into visible color images, substituting a photonic process for a mechanical optical system.
2Reliability
If conventional CRT displays are used, then vivid colors and high resolution can be achieved, but the cathode-ray tube structure limits further development
Solution Approach 1:
The patent changes the fundamental operating parameters from electron beam excitation in a vacuum tube to optical excitation of fluorescent materials. This allows the system to achieve similar image quality through different physical mechanisms, enabling modern adaptations with improved reliability and versatility while maintaining vivid colors and high resolution.
Solution Approach 2:
The patent uses composite fluorescent materials including phosphors and quantum dots that can be tuned to emit specific colors when excited by light. This composite approach replaces the cathode-ray tube's electron-phosphor interaction with a more versatile optical-fluorescent system that offers better adaptability while maintaining image quality.
3Device complexity
If direct color image production is implemented, then optical lens systems can be eliminated, but efficient light coupling into the fluorescent layer becomes challenging
Solution Approach 1:
The patent introduces a prismatic layer with three-dimensional geometric structures that manipulate light propagation in multiple dimensions. The prisms redirect excitation light at various angles to improve coupling into the fluorescent layer, solving the light coupling challenge without adding complex optical components.
Solution Approach 2:
The patent applies prismatic structures with specific geometric properties at the interface between the excitation light path and the fluorescent layer. These localized optical elements are designed to optimize light coupling efficiency at the critical interface region, directing light effectively into the fluorescent material while maintaining system simplicity.
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 solution allows for the creation of compact, efficient display systems that produce vivid color images by directly emitting light from the screen, enhancing image quality and reducing the need for complex optical systems, thus overcoming the limitations of traditional CRTs and projection-based displays.
Implementation Method 1
a fluorescent layer which absorbs excitation light at an excitation wavelength to emit visible light at a different visible wavelength
Implementation Method 2
a prismatic layer including a plurality of prism elements which receive and couple the excitation light to the fluorescent layer
Data Source
AI summary
Fluorescent screens and display systems and devices based on such screens using at least one excitation optical beam to excite one or more fluorescent materials on a screen which emit light to form images. The fluorescent materials may include phosphor materials and non-phosphor materials such as quantum dots.