Decorative Illumination Sheet with Selective Wavelength Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Decorative illumination signboards using white LED light sources face issues with show-through of the light source image due to the different light emitting wavelengths, leading to reduced brightness and image quality, as traditional solutions either fail to suppress the show-through or compromise image brightness.
Innovation Solution
A decorative illumination recording sheet with a white layer containing a white pigment and a binder, along with a colorant different from the white pigment, is developed, where the average transmittance in specific wavelength ranges is adjusted to balance the suppression of show-through and maintain image brightness, using a resin base and an ink accepting layer for improved adhesion and image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a white layer with white pigment is provided on the resin base to scatter LED light, then the LED light source emission is diffused, but the light source image becomes visible through the decorative illumination image in an annular shape
Solution Approach 1:
The patent applies local quality by introducing a colorant specifically in the wavelength range exceeding 700 nm within the white layer. This localized spectral modification allows the layer to maintain its light scattering function for visible light while selectively absorbing the problematic long-wavelength LED emission that causes annular show-through, thus resolving the contradiction between brightness and light source image visibility.
Solution Approach 2:
The patent changes the optical parameters of the white layer by adding a colorant that selectively absorbs light in the wavelength range exceeding 700 nm. This parameter change modifies the transmittance characteristics of the layer without compromising its overall light scattering ability, thereby suppressing the annular light source image show-through while maintaining image brightness.
2Object-affected harmful factors
If the transmittance in the wavelength range exceeding 700 nm is reduced to suppress show-through, then the light source image visibility is reduced, but the brightness of the decorative illumination image is also reduced
Solution Approach 1:
The patent applies local quality by introducing a colorant specifically in the wavelength range exceeding 700 nm within the white layer. This localized spectral modification allows the layer to maintain its light scattering function for visible light while selectively absorbing the problematic long-wavelength LED emission that causes annular show-through, thus resolving the contradiction between brightness and light source image visibility.
Solution Approach 2:
The patent utilizes color changes by incorporating a colorant that selectively absorbs light in the wavelength range exceeding 700 nm. This colorant modifies the spectral transmittance of the white layer, creating a selective optical filter effect that suppresses the annular light source image show-through while maintaining adequate brightness for the decorative illumination image.
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 effectively prevents show-through of the LED light source image while maintaining the brightness and image quality of the decorative illumination signboard, achieving a balance between image clarity and brightness.
Implementation Method 1
a white layer that is disposed on the resin base and contains a white pigment and a binder
Implementation Method 2
in a case where an average transmittance in a wavelength range of 400 nm to 700 nm is represented by Tv and an average transmittance in a wavelength range exceeding 700 nm, but not exceeding 800 nm is represented by Tr
Data Source
AI summary
A decorative illumination recording sheet that includes: a resin base; and a white layer that is disposed on the resin base and contains a white pigment and a binder, in which a colorant different from the white pigment is contained, and in a case where an average transmittance in a wavelength range of 400 nm to 700 nm is represented by Tv and an average transmittance in a wavelength range exceeding 700 nm, but not exceeding 800 nm is represented by Tr, Tv and Tr satisfy relationships expressed by the following Formulae (1) and (2), a method of manufacturing the decorative illumination recording sheet, a decorative illumination image sheet, a method of manufacturing the decorative illumination image sheet, and a decorative illumination signboard.40.0%≤Tv<50.0% (1)40.0%≤Tr<50.0% (2)