Virtual Image Display Device with Inclined Light Combining Surfaces
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Solution Overview
Problem
Virtual image display devices for VR and AR applications face challenges in reducing volume and weight while improving side door effect (SDE) and achieving enhanced resolution and luminance.
Innovation Solution
The design incorporates a unique configuration of light combining and diffraction parts with inclined surfaces and sub-diffraction portions, optimizing the angle and refractive index to overlap and diffract colored light images effectively, reducing the number of display parts and enhancing optical efficiency and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple display parts are used to output different colored light images, then image resolution and color quality are improved, but device volume and weight increase
Solution Approach 1:
The patent combines multiple display parts (first and second display parts outputting different colored light images) into a single integrated display unit. The light combining part merges the light from these display parts and directs it through a single light output surface, reducing the overall device volume while maintaining the resolution benefits of multiple display parts.
Solution Approach 2:
The patent uses inclined surfaces at specific angles (first and second inclined surfaces) to redirect light from the display parts in a compressed spatial arrangement. This angular optimization allows multiple display parts to be positioned more efficiently, reducing the device volume while preserving image quality.
2Illumination intensity
If light combining parts with inclined surfaces are used, then optical efficiency and luminance are improved, but manufacturing complexity increases
Solution Approach 1:
The patent specifies precise angular parameters for the inclined surfaces (first and second inclined surfaces with defined angles relative to the light output surface). By optimizing these geometric parameters, the patent achieves improved optical efficiency and luminance while providing clear manufacturing guidelines for replicating the structure.
3Object-generated harmful factors
If light diffraction parts with sub-diffraction portions are used, then side door effect is improved, but device complexity increases
Solution Approach 1:
The light diffraction part is segmented into multiple sub-diffraction portions (first, second, third, and fourth sub-diffraction portions) arranged in a specific pattern. This segmentation allows the structure to effectively address the side door effect by creating multiple diffraction zones, while the modular design simplifies the manufacturing process compared to a monolithic diffraction structure.
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 enhances image resolution and luminance, reduces the device's volume and weight, and improves the side door effect, providing a more efficient and effective virtual image display experience.
Implementation Method 1
a first light combining part; a second light combining part spaced apart from the first light combining part and disposed adjacent to the first light combining part in a direction
Implementation Method 2
a first light diffraction part disposed on a first light output surface of the first light combining part, and a second light diffraction part disposed on a second light output surface of the second light combining part
Implementation Method 3
at least one of the first inclined surface, the second inclined surface, the third inclined surface, the fourth inclined surface, the first light output surface, and the second light output surface may be a curved surface, and the curved surface may be convex in an inward direction
Data Source
AI summary
A virtual image display device includes first and second light combining parts spaced apart from each other, a first display part on a first inclined surface of the first light combining part, a second display part on a second inclined surface of the first light combining part, a third display part on a third inclined surface of the second light combining part, a fourth display part on a fourth inclined surface of the second light combining part, a first light diffraction part on a first light output surface of the first light combining part, and a second light diffraction part on a second light output surface of the second light combining part. Two of the first to fourth display parts output images of a same color light, and the other two of the first to fourth display parts output images of different color light.