Transmission Screen Microlens Diffusion Uniformity
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Solution Overview
Problem
Conventional microlens arrays used in head-up display devices exhibit non-uniform scattered light intensity within a view angle, leading to issues with image brightness and clarity, particularly in peripheral areas.
Innovation Solution
A transmission type screen comprising a microlens array on one surface and a light diffusion surface on the opposing surface, where the diffusion angle ratio of the light diffusion surface to the microlens array is between 0.2 and 0.4, with micro-irregularities and an arithmetic average surface roughness of 0.13 to 1.30 µm, and a haze value of 35% to 70%, ensuring uniform light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a microlens array is used, then light can be directed efficiently, but boundary effects between microlenses cause non-flat scattered light intensity
Solution Approach 1:
The patent combines a microlens array that provides efficient light direction with a light diffusion sheet that eliminates boundary effects. The microlens array maintains efficient light direction by focusing incident light into specific angular ranges, while the light diffusion sheet with appropriate diffusion angle ratio (0.2-0.4) smooths out the intensity variations caused by microlens boundaries, producing a flat scattered light intensity profile across all viewing angles.
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 achieves a more uniform scattered light intensity within a predetermined scattering angle, resulting in improved light intensity uniformity across the view angle, enhancing image clarity and reducing brightness variations in head-up display devices.
Implementation Method 1
a microlens array including a plurality of microlenses... distribution of light intensity in a view angle can be made small
Implementation Method 2
the second surface is equipped with a light diffusion surface... scattered light intensity has two peaks... causes a problem
Data Source
Figure 1
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AI summary
In order to provide a transmission type screen having a flat scattered intensity within a predetermined scattering angle, a transmission type screen (50) according to the present invention comprising a first surface (51), and a second surface (52) opposed to the first surface (51), wherein: the first surface (51) is equipped with a microlens array (57) including a plurality of microlenses; the second surface (52) is equipped with a light diffusion surface (60); and a diffusion angle ratio of a diffusion angle of the light diffusion surface (60) relative to a diffusion angle of the microlens array (57) is not less than 0.2 and not more than 0.4.