Prism Light Emission Surface Refractive Power Adjustment
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Solution Overview
Problem
Existing see-through type display devices face challenges in maintaining image quality due to distortion and limited optical component arrangement, which affects the visibility of external scenes and deteriorates imaging performance.
Innovation Solution
The display device incorporates an image element, a projection lens, a prism with a light incident, reflection, and emission surface, and a see-through mirror. An intermediate image is formed between the reflection surface and the mirror, and the light emission surface of the prism has distinct regions with varying refractive powers to adjust the light rays and reduce distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large region is secured for external scene visibility in a see-through type display device, then the external scene can be observed, but the arrangement of optical components is limited, distortion increases, and imaging performance deteriorates
Solution Approach 1:
The light emission surface of the prism is divided into a first region and a second region with different refractive powers. The second region has higher refractive power than the first region, creating local quality variations that control light ray paths differently in different areas, thereby reducing distortion while maintaining a large visibility region
Solution Approach 2:
The refractive power parameter is changed across different regions of the light emission surface. By making the refractive power higher in the second region compared to the first region, the optical path is adjusted to reduce distortion and improve imaging performance without compromising the large visibility area
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 reduces distortion and improves image quality by adjusting the light rays and minimizing the relative increase in imaging magnification, thereby enhancing the overall performance of the display device while maintaining a compact design.
Implementation Method 1
a prism that includes: a light incident surface in which the image light from the projection lens is incident, a light emission surface emitting the image light, and a reflecting surface reflecting the image light from the light incident surface toward the light emission surface
Implementation Method 2
a mirror that reflects a part of the image light from the prism mirror toward a pupil position
Implementation Method 3
the light emission surface has a first region and a second region that is higher refractive a power than the first region
Data Source
AI summary
A display device includes a projection lens that transmits an image light, a prism mirror that receives the image light emitted from the projection lens through a light incident surface, reflects the image light with an inner reflection surface, and emits the image light from a light emission surface, and a see-through mirror that reflects a part of the image light emitted from the prism mirror toward a pupil position, wherein an intermediate image is formed between the inner reflection surface and the see-through mirror, and the light emission surface has a first region and a second region that is higher a refractive power than the first region.