Curved Light-Incident Portion for Thin Display Brightness
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Solution Overview
Problem
Existing display apparatus configurations fail to simultaneously achieve high brightness of image light beams and a thin light guide portion, and they do not provide a cost-effective method for manufacturing transparent members with partial reflection layers suitable for bonding.
Innovation Solution
A display apparatus design featuring a light guide system with a transparent light-incident portion and a light guide portion that converts non-parallel image light beams into parallel beams using a light-incident curved surface and a light-reflective curved surface, allowing for efficient light emission even when the light guide portion is thin, and utilizing a bonding structure between transparent members to form partial reflection layers at a lower cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the light guide portion is made thin, then the display apparatus can be more compact and comfortable for eye wear, but the brightness of image light beams emitted from the light-emitting portion decreases
Solution Approach 1:
The light-incident portion employs curved surfaces (light-incident curved surface and light-reflective curved surface) to convert non-parallel image light beams into parallel light beams. This curvature-based optical design enables efficient light guidance through a thin light guide portion while maintaining high brightness, as the curved surfaces effectively control light propagation paths without requiring increased thickness
Solution Approach 2:
The invention changes the optical parameters of the light-incident portion by forming curved surfaces with specific radii of curvature. The light-incident curved surface has a first radius of curvature and the light-reflective curved surface has a second radius of curvature, where these curvature parameters are optimized to convert divergent light into parallel light, enabling thin light guide design while maintaining brightness
2Ease of manufacture
If conventional bonding methods are used to join transparent members with partial reflection layers, then assembly is achieved, but manufacturing costs increase and manufacturing complexity increases
Solution Approach 1:
The invention merges the transparent member and partial reflection layers into a single integrated component. The partial reflection layers are formed directly on the transparent member in a specific pattern, eliminating the need for separate bonding processes and reducing manufacturing steps while maintaining the required optical functionality
Solution Approach 2:
The partial reflection layers are formed in advance on the transparent member during the same manufacturing process. This preliminary formation of reflection layers simplifies subsequent assembly steps and reduces overall manufacturing complexity by preparing the component with all necessary optical features before final assembly
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 design enables high-brightness image light emission from a thin light guide portion while reducing manufacturing costs and simplifying the projection lens system, ensuring effective light distribution and maintaining image quality.
Implementation Method 1
a light-reflective curved surface which reflects the image light beams incident from the light-incident curved surface, the light-incident curved surface and the light-reflective curved surface convert from the image light beams into a parallel light beams
Data Source
AI summary
There is provided a display apparatus including a light guide system that includes a light-incident portion including a light-incident curved surface on which image light beams as non-parallel light beams are incident and a light-reflective curved surface which reflects the image light beams such that the image light beams are converted into parallel light beams, and a light guide portion being a portion in which a plurality of partial reflection layers are disposed in parallel. The light guide portion is filled with a parallel light flux emitted from the light-incident portion. The light-incident portion is formed of a first transparent member, the portion in which the partial reflection layers are formed is formed of a second transparent member which is surface-bonded to the first transparent member via a bonding surface, and the bonding surface is inclined in the same direction as that of the partial reflection layer.