Curved Prism Light Guide for Aerial Display Aberration
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Solution Overview
Problem
Conventional aerial display devices suffer from image aberration due to flat reflective surfaces in the light guide, leading to unclear images as the position in the thickness direction of the light guide affects the image formation, causing aberration and reducing image clarity.
Innovation Solution
A display device with a light guide plate featuring emission structure units, such as prisms, with optical surfaces formed in a curved shape in the thickness direction to reflect or refract image light, ensuring it is focused correctly regardless of the position, thereby preventing aberration and enhancing image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat reflective surface is used in the light guide, then the device structure is simple, but image aberration occurs and the displayed image becomes unclear
Solution Approach 1:
The reflective surface is changed from a flat plane to a curved surface (specifically a spherical or aspherical surface). This curvature allows the reflective surface to focus light rays from different positions in the light guide to converge at the same image point, eliminating aberration and improving image clarity while maintaining manufacturing feasibility through molding techniques.
2Adaptability or versatility
If the reflective surface is positioned at different depths in the light guide thickness direction, then light reflection can be achieved, but aberration occurs causing unclear images
Solution Approach 1:
By forming the reflective surface as a curved surface, the patent enables light rays reflecting from the same reflective surface at different depth positions to converge at a single focal point. The curvature compensates for the path difference of light rays, ensuring that regardless of the reflective surface's position in the thickness direction, the reflected light forms a sharp image without aberration.
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 curved optical surfaces effectively focus image light, eliminating aberration and resulting in a clear and sharp image display, improving the overall clarity of the images projected in the air.
Implementation Method 1
image light is emitted from a light exit surface of the light guide plate, the image light being reflected or refracted by each of a plurality of emission structure units provided on the light guide plate
Implementation Method 2
image light is emitted from a light exit surface of the light guide plate, the image light being reflected or refracted by each of a plurality of emission structure units provided on the light guide plate
Data Source
AI summary
To make a displayed image clear. A display device emits image light reflected by a plurality of prisms (141) provided in a light guide plate (14) from a light exit surface (14c). The prism (141) has a reflective surface (141a) that reflects and emits the image light. The reflective surface (141a) is formed in a curved shape in a thickness direction of the light guide plate (14).