Display Device Scattering Layer Luminance and Outline Masking
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Solution Overview
Problem
Conventional decorative sheets for three-dimensional surfaces, such as vehicle components, face issues with attenuated luminance of optical images due to decorative layers and visible outlines of light transmitting regions when the light source is turned off.
Innovation Solution
A display device configuration featuring a first decorative layer with a light transmitting region, a scattering layer below it, and a second decorative layer positioned to overlap the light transmitting region, with the light source disposed at the side of the scattering layer, enhancing luminance and making the outline of the light transmitting region less visible when the light source is off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a decorative layer is added to display optical images, then the decorative pattern visibility is improved, but the luminance of optical images is attenuated
Solution Approach 1:
The decorative sheet is divided into multiple functional layers: a first decorative layer with light transmitting regions for displaying optical images, and a second decorative layer for providing decorative patterns. This segmentation allows each layer to perform its specific function optimally without interfering with the other's performance.
Solution Approach 2:
The first decorative layer has spatially varying properties: light transmitting regions with high transparency for image display, and light shielding regions with low transparency for background decoration. This local quality variation enables the sheet to simultaneously achieve high luminance where needed and adequate decorative coverage elsewhere.
2Illumination intensity
If the transparency of the decorative layer is increased to improve luminance, then the luminance of optical images is improved, but the outline of the light transmitting region becomes visible when the light source is turned off
Solution Approach 1:
The decorative pattern function is extracted from the light transmitting layer and placed in a separate second decorative layer. This allows the first decorative layer to be optimized for light transmission and luminance without compromise, while the second layer provides the decorative patterns that remain visible when the light source is off, effectively masking the outlines of light transmitting regions.
3Loss of information
If a light shield layer is used to prevent visible outlines, then the outline visibility is reduced, but the luminance of optical images is attenuated
Solution Approach 1:
Instead of using a light shield layer that blocks light in the vertical dimension, the solution places a second decorative layer at a different vertical position below the scattering layer. This layer provides decorative coverage in the vertical dimension without interfering with light transmission, as the scattering layer above it diffuses the light effectively.
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 increases the luminance of optical images displayed on the surface when the light source is on and makes the outline of the light transmitting region inconspicuous when it is off, while maintaining high transparency and visibility of the decorative patterns.
Implementation Method 1
a scattering layer disposed below the first decorative layer, the scattering layer being configured to scatter the light
Data Source
AI summary
A display device includes a first decorative layer representing a decorative pattern; a light transmitting region provided in the first decorative layer, the light transmitting region being configured to transmit light; a scattering layer disposed below the first decorative layer, the scattering layer being configured to scatter the light; a light source disposed at a side of the scattering layer, the light source being configured to emit light toward the scattering layer; and a second decorative layer disposed below the scattering layer and at a position overlapping the light transmitting region, the second decorative layer representing a decorative pattern.