Display Color Shift Reduction via Alternating Optical Distance Regions
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Solution Overview
Problem
Structural color displays with periodic structures, such as diffraction gratings, experience significant color shifts when the observation angle changes, making it difficult to fix specific colors, and require high dimensional accuracy in the uneven structure's spacing to achieve desired colors, which is challenging to achieve accurately.
Innovation Solution
A display with an uneven-structure-forming layer having two kinds of regions with different constant optical distances between flat bottoms and flat tops, where the optical distances are selected from specific ranges to reduce color shift, and the regions are alternately arrayed to stabilize the color appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a periodic structure such as a diffraction grating is used for structural color development, then color development capability is improved, but color stability against observation angle changes deteriorates
Solution Approach 1:
The uneven-structure-forming layer is divided into multiple regions, each having a different constant optical distance between flat bottoms and flat tops. This segmentation allows different regions to contribute different wavelengths to the reflected light, creating a composite color that is less sensitive to observation angle changes while maintaining structural color development capability.
2Manufacturing precision
If the distance between flat bottoms and flat tops is determined with high dimensional accuracy, then desired color development is achieved, but manufacturing difficulty increases
Solution Approach 1:
Different regions of the uneven-structure-forming layer are assigned different constant optical distances tailored to their specific functions. This local quality approach allows each region to be optimized for its role in color development, with the combination of regions producing the desired overall color effect while reducing the need for ultra-precise control across the entire structure.
Solution Approach 2:
The patent employs multiple discrete optical distance values (different constant distances between flat bottoms and flat tops in different regions) rather than a single uniform value. This parameter variation allows the system to achieve desired color development through the collective contribution of multiple regions, making the overall color output more robust to manufacturing tolerances in individual regions.
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 reduces color shift during production, increasing manufacturing productivity and ensuring consistent color display across different observation angles.
Implementation Method 1
The structural color is caused by light diffraction, light scattering, thin film interference, multilayer film interference, or the like, through radiation of light to a fine structure of about several micrometers to several nanometers.
Implementation Method 2
a light reflecting layer covering all or a part of an uneven surface of the uneven-structure-forming layer
Implementation Method 3
When light is incident on the uneven structure provided to the display surface, diffracted light is emitted in various directions.
Data Source
AI summary
The display of the present invention includes an uneven-structure-forming layer having a surface provided with a plurality of concavities or a plurality of convexities respectively provided with flat bottoms and flat tops substantially parallel to the flat bottoms, and a light reflecting layer covering all or a part of an uneven surface of the uneven-structure-forming layer. The uneven-structure-forming layer is provided with two kinds of uneven-structure-forming regions. Each of the two kinds of uneven-structure-forming regions has a constant optical distance between the flat bottoms and the flat tops, but the optical distance is different between the two kinds of regions. The two kinds of uneven-structure-forming regions are alternately arrayed. The optical distances in the two kinds of uneven-structure-forming regions have respective set values which are so selected, when forming the uneven surface of the uneven-structure-forming layer, to form a combination contributing to reduction of a color shift of the display.