Radiation Converting Panel Luminance Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional radiation image converting panels experience significant luminance unevenness on the panel surface after the formation of a protective film, with luminance in the periphery being higher than at the center, leading to reduced image sharpness and quality over time.
Innovation Solution
The radiation image converting panel features a radiation converting film with a controlled film thickness distribution, specifically a convex, W-shaped, concave, or M-shaped sectional shape, allowing for arbitrary adjustment of luminance distribution post-protective film formation, using a Eu-doped photostimulable phosphor layer with columnar crystals tilted at a predetermined angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective film is formed on the surface of the radiation converting film, then the radiation converting film is protected from moisture and deterioration, but luminance unevenness occurs on the panel surface with the periphery having higher luminance than the center
Solution Approach 1:
The invention applies local quality by creating a non-uniform film thickness distribution in the radiation converting film, with the center portion having a greater thickness than the peripheral portion. This compensates for the luminance increase in the periphery caused by the protective film, achieving uniform overall luminance across the panel surface.
2Ease of manufacture
If the radiation converting film has a uniform thickness, then the manufacturing process is simple, but significant luminance unevenness occurs after protective film formation
Solution Approach 1:
The invention transitions from uniform film thickness to non-uniform film thickness distribution, where the center portion has a greater thickness than the peripheral portion. This local variation in thickness compensates for the protective film's effect on luminance distribution.
Solution Approach 2:
The invention applies preliminary anti-action by pre-compensating for the luminance unevenness that will occur after protective film formation. The radiation converting film is manufactured with a thicker center portion before the protective film is applied, anticipating and counteracting the future luminance distribution problem.
3Illumination intensity
If the luminance in the periphery of the panel is higher than at the center, then the panel appears brighter overall, but image sharpness and quality deteriorate due to luminance unevenness
Solution Approach 1:
The invention applies local quality by creating a non-uniform film thickness distribution in the radiation converting film, with the center portion having a greater thickness than the peripheral portion. This compensates for the luminance increase in the periphery caused by the protective film, achieving uniform overall luminance across the panel surface.
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 ensures a uniform or enhanced luminance distribution on the panel surface, maintaining or exceeding average luminance levels, thereby improving image quality and reducing luminance unevenness, even after protective film application.
Implementation Method 1
a radiation converting film which converts an incident radiation ray to a visible light
Implementation Method 2
since a photostimulable excitation light or photostimulable emission is effectively suppressed from diffusing in the horizontal direction (reaches the support body surface while repeating reflection at crack (columnar crystal) interfaces)
Data Source
Figure 1A~1C
Figure 2A~2C
Figure 3A~3C
AI summary
The present invention relates to a radiation image converting panel with a structure capable of arbitrarily controlling the luminance distribution of the panel surface after formation of a protective film according to usage conditions. The radiation image converting panel comprises a support body and a radiation converting film formed on the support body. The radiation converting film is formed on a film forming region which existes within a first main surface of the support body and includes at least a gravity center position of the first main surface. The film thickness of the radiation converting film is adjusted such that the maximum difference can be obtained in either one of a peripheral area and a middle area from a central area including the gravity center position.