Fluorescent Screen Reflecting Layer Holes for Uniformity
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Solution Overview
Problem
In image display devices with fluorescent screens, in-plane uniformity of fluorescence is reduced due to environmental variations and phosphor layer distortions, leading to reduced color reproducibility and challenges in accurately calibrating excitation light, especially with dielectric multilayer films having non-uniform thicknesses that affect transmittance and reflectance.
Innovation Solution
A fluorescent screen with a phosphor layer and a reflecting layer that transmits excitation light and reflects fluorescence, featuring a plurality of holes to improve light utilization efficiency and allow accurate detection of in-plane fluorescence variations, thereby enabling precise calibration of excitation light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a dielectric multilayer film is used as the reflecting layer to improve fluorescence reflection efficiency, then light utilization efficiency is improved, but in-plane uniformity of fluorescence is reduced due to thickness variations affecting transmittance and reflectance
Solution Approach 1:
The reflecting layer is segmented into multiple discrete reflective elements (reflective regions) rather than a continuous dielectric multilayer film. This segmentation allows each reflective element to be independently positioned and sized, enabling precise control over light reflection paths while maintaining manufacturing tolerances. The segmented structure reduces the impact of local thickness variations on overall fluorescence uniformity.
Solution Approach 2:
The patent applies reflective properties locally at specific positions rather than uniformly across the entire layer. By positioning reflective regions only where needed to redirect specific light paths, the solution achieves high light utilization efficiency in critical areas while avoiding the uniformity problems that would result from applying a continuous dielectric multilayer film across the entire surface.
2Loss of energy
If the reflecting layer is made highly reflective to improve light utilization efficiency, then fluorescence is better utilized, but detection precision of in-plane fluorescence variations is reduced due to blocked light paths
Solution Approach 1:
The reflecting layer is divided into discrete reflective regions with specific geometries and positions. This segmentation creates controlled light paths where reflected fluorescence can be directed toward detection systems, enabling both high light utilization and accurate measurement of in-plane fluorescence variations.
Solution Approach 2:
The patent introduces an intermediary detection system that captures fluorescence through the structured reflecting layer. The reflective regions act as intermediaries that both utilize fluorescence for image formation and redirect a portion of it for detection purposes, resolving the contradiction between high reflection efficiency and measurement capability.
3Ease of manufacture
If the fluorescent screen structure is simplified to reduce manufacturing complexity, then ease of manufacture is improved, but light utilization efficiency is reduced due to inability to effectively manage fluorescence exit paths
Solution Approach 1:
The reflecting layer is segmented into simple geometric shapes (such as rectangular or circular reflective regions) that can be manufactured using standard fabrication techniques. This segmentation provides effective light path control without requiring complex multilayer dielectric structures, thereby maintaining ease of manufacture while achieving high light utilization efficiency.
Solution Approach 2:
The patent optimizes parameters such as the size, shape, spacing, and positioning of reflective regions to achieve high light utilization efficiency. By carefully controlling these geometric parameters, the solution attains effective fluorescence management with a structurally simple single-layer reflecting film, avoiding the manufacturing complexity of dielectric multilayer films.
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 enhances light utilization efficiency and allows for accurate detection of in-plane fluorescence variations, improving color reproducibility by reducing the impact of non-uniform film thickness on transmittance and reflectance, ensuring consistent fluorescence across the screen.
Implementation Method 1
a phosphor layer including a phosphor which absorbs excitation light to generate fluorescence (visible light)
Implementation Method 2
a reflecting layer which is provided on one surface of the phosphor layer so as to transmit the excitation light and to reflect, to the phosphor layer, a part of fluorescence
Data Source
AI summary
A fluorescent screen includes a phosphor layer including a phosphor that absorbs excitation light to emit fluorescence, a reflecting layer that is provided on one surface of the phosphor layer so as to transmit the excitation light and to reflect, to the phosphor layer, a part of fluorescence that is emitted from the phosphor and that exits from the one surface; and a plurality of holes that penetrates the reflecting layer.