Translucent Colored Film for Backlit Displays
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Solution Overview
Problem
Backlit signs illuminated by multiple point light sources, such as LED arrays, often suffer from uneven illumination, resulting in 'hot spots' and reduced brightness, which can diminish marketing appeal and are costly to construct and maintain.
Innovation Solution
A translucent colored film structure incorporating light-diffusing particles within an adhesive layer, which disperses light evenly while maintaining color transmission, reducing the need for multiple films and minimizing hot spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple point light sources are used to illuminate the sign face, then the brightness can be increased, but the illumination becomes uneven causing hot spots
Solution Approach 1:
The patent introduces a translucent film with light-diffusing particles as an intermediary between the point light sources and the sign face. This film mediates the light distribution by scattering and diffusing the light from multiple point sources, transforming the uneven illumination into uniform illumination across the sign face while maintaining high brightness levels.
Solution Approach 2:
The patent changes the optical parameters of the illumination system by incorporating light-diffusing particles with specific refractive indices into the translucent film. This parameter change enables the film to control light scattering and diffusion, converting concentrated point light sources into distributed uniform illumination while maintaining intensity.
2Area of stationary object
If multiple point light sources are used, then the illumination coverage is improved, but the device complexity and construction cost increase
Solution Approach 1:
The translucent film with light-diffusing particles serves multiple functions simultaneously: it diffuses light to eliminate hot spots, maintains brightness levels, provides color transmission, and enables the use of fewer light sources. This multi-functionality reduces the number of required light sources and simplifies the overall illumination system design and construction.
3Stability of the object's composition
If a translucent film with light-diffusing particles is used, then the illumination uniformity is improved, but the film structure complexity increases
Solution Approach 1:
The patent employs a composite film structure combining a translucent base material with dispersed light-diffusing particles. This composite material integrates light-diffusing functionality within the film itself, eliminating the need for separate diffusion layers or complex multi-layer structures, thereby simplifying the overall film construction while achieving uniform illumination.
4Illumination intensity
If the pigment particles are made smaller to maintain color vibrancy, then the color transmission is improved, but the light-diffusing capability is reduced
Solution Approach 1:
The patent applies local quality by assigning different functions to different components: smaller pigment particles (0.1-3 μm) are used specifically for color transmission in the colored layer, while separate light-diffusing particles are incorporated into the translucent film. This spatial and functional separation allows each component to optimize its specific function without compromising the other.
Solution Approach 2:
The patent uses composite material structure with distinct functional layers: a colored layer containing small pigment particles for color vibrancy, and a translucent film with light-diffusing particles for illumination uniformity. This composite structure enables both small pigment particles and effective light diffusion to coexist by separating their locations and functions.
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 film structure provides a uniformly illuminated sign face with reduced hot spots, maintaining color vibrancy and allowing for a thinner sign design, thus enhancing marketing appeal and reducing construction costs.
Implementation Method 1
light-diffusing particles dispersed in the adhesive layer having a refractive index that is higher than the adhesive composition
Implementation Method 2
light-diffusing particles dispersed in the adhesive layer having a refractive index that is higher than the adhesive composition
Implementation Method 3
The colored layer includes pigment particles dispersed in a material
Data Source
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AI summary
A two-in-one colored and translucent film structure suitable for use in backlit displays having a multi-point illumination source. The film structure utilizes a colored layer and a light-diffusing layer that reduces variations in the amount of light transmitted through different areas of a backlit sign. The light- diffusing layer includes light-diffusing particles dispersed in a transparent matrix material, and scatters light transmitted therethrough. The light-diffusing particles have an index of refraction that is different than an index of refraction of the matrix material.