Head-Mounted Display Light-Guide Plate Hollow Microstructures
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Solution Overview
Problem
Existing head-mounted display technologies face high production barriers due to the need for complex designs, such as embedding periodic light splitting layers or forming microstructures with reflection films on light-guide plates, which complicate the manufacturing process.
Innovation Solution
A head-mounted display design featuring a light-guide plate with hollow microstructures filled with a material of higher refractive index, eliminating the need for a reflection film by utilizing total internal reflection to guide the image beam to the user's eyes, comprising a micro-display, reflector, collimating lens, and filling structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic light splitting layers are embedded in the light-guide plate or microstructures with reflection films are formed on the light-guide plate, then the image beam can be guided out to the user's eyes, but the production barrier becomes high and manufacturing becomes difficult
Solution Approach 1:
The invention changes the refractive index parameter by filling the hollow microstructures with a material having a higher refractive index than the light-guide plate. This parameter change enables total internal reflection at the interface, replacing the need for reflection films and simplifying manufacturing while maintaining reliable image beam guidance.
Solution Approach 2:
The invention extracts and removes the reflection film component from the system. By using the refractive index difference between the filling structure and light-guide plate to achieve total internal reflection, the design eliminates the need for separate reflection films, thereby reducing manufacturing complexity and production barriers.
2Reliability
If reflection films are coated on microstructures to guide the image beam, then the light guidance function is achieved, but the manufacturing process becomes complex
Solution Approach 1:
The invention removes the reflection film layer from the device structure. By utilizing total internal reflection at the interface between the light-guide plate and the higher refractive index filling structure, the design achieves light guidance without requiring additional film coating processes, thereby reducing device complexity and manufacturing process complexity.
Solution Approach 2:
The invention substitutes the mechanical/chemical process of coating reflection films with a purely optical phenomenon (total internal reflection). By changing the refractive index parameter through material selection rather than adding functional layers, the manufacturing process becomes simpler while maintaining the light guidance function.
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 design simplifies the manufacturing process by eliminating the need for a reflection film, improving production feasibility while effectively guiding the image beam to the user's eyes through total reflection, enhancing the usability and convenience of the head-mounted display.
Implementation Method 1
a refractive index of the first filling structure is greater than a refractive index of the first light-guide plate. After the image beam enters the first filling structure, the image beam is totally reflected at a boundary of the filling structure and the hollow microstructures
Data Source
AI summary
A head-mounted display having a first light incident region and a first light emitting region is provided. The head-mounted display includes a first light-guide plate, a first micro-display, a first reflector, a first collimating lens and a first filling structure. A first inner surface of the first light-guide plate has plural first hollow microstructures located in the first light emitting region. The first micro-display is located in the first light incident region and faces the first inner surface. The first reflector is located in the first light incident region, obliquely disposed at the first light-guide plate and faces the first micro-display. The first collimating lens is disposed between the first reflector and the first micro-display. The first filling structure fills in the first hollow microstructures, wherein a refractive index of the first filling structure is greater than a refractive index of the first light-guide plate.