Reflective Display Light Diffusion Control Layer
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Solution Overview
Problem
Reflective display bodies with the ability to change the up-down direction of display content face challenges in maintaining visibility due to inadequate light diffusion, leading to inconsistent brightness when the orientation is changed.
Innovation Solution
A reflective display body with a light diffusion control layer featuring a regular internal structure of high and low refractive index regions, where the high refractive index regions extend from one surface to the other and are tilted with respect to the thickness direction, ensuring effective light diffusion across various orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a general light diffusion plate is incorporated into the display body, then light diffusion is improved, but light loss due to stray light or backscattering occurs which impairs image clarity
Solution Approach 1:
The light diffusion control layer is positioned specifically between the reflective layer and the display surface, creating localized light diffusion control at the critical interface where reflected light exits the display. This targeted approach diffuses light only where needed without the excessive light loss that would occur with a general diffusion plate throughout the entire display structure.
Solution Approach 2:
The invention changes the optical parameters of the light diffusion control layer, specifically controlling the refractive index difference between the layer and surrounding materials. By optimizing this refractive index parameter, the layer achieves effective light diffusion while minimizing stray light and backscattering losses, resolving the contradiction between diffusion effectiveness and light loss.
2Adaptability or versatility
If the up-down direction of display content is changed, then display orientation flexibility is improved, but visibility deteriorates because the light diffusion control layer cannot sufficiently exhibit its effect
Solution Approach 1:
The light diffusion control layer is designed with an asymmetric refractive index structure where the diffusion effect is optimized for light incident from the reflective layer side. This asymmetric design ensures that regardless of how the display content orientation is changed, the layer consistently provides effective light diffusion control for the reflected light path, maintaining visibility across different orientations.
Solution Approach 2:
The light diffusion control layer is designed to perform its light diffusion function universally across different display content orientations. By positioning the layer at the interface between the reflective layer and display surface, it becomes orientation-independent, providing consistent visibility improvement whether the display content is oriented vertically or horizontally.
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 configuration maintains excellent visibility and reduces brightness differences when the display content's up-down direction is changed, ensuring consistent illumination regardless of orientation.
Implementation Method 1
a light diffusion control layer that can transmit and diffuse the incident light within a predetermined incident angle range
Implementation Method 2
the regions having the relatively high refractive index extend from one surface side toward another surface side of the light diffusion control layer
Data Source
AI summary
A reflective display body includes a light diffusion control layer and a reflective layer. The light diffusion control layer has a plurality of regions having a relatively high refractive index in a region having a relatively low refractive index. The regions having the relatively high refractive index extend from one surface side toward the other surface side of the light diffusion control layer, and a straight line parallel to the extending direction is tilted with respect to the thickness direction of the light diffusion control layer. When a vector C is obtained by projecting a vector, which is parallel to the extending direction and directed from the surface side distal to the display surface of the reflective display body toward the display surface side, onto the display surface, the smallest angle among three angles between vector C and vectors D1 to D3 is more than 0° and 45° or less.