Optical Lens Assembly for Compact Head-Mounted Display
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Solution Overview
Problem
Head-mounted display devices are bulky due to the need for a sufficient optical path for light ray propagation, making them inconvenient for users to wear and use.
Innovation Solution
An optical lens assembly comprising a lens body, a transflective film on the light incident surface, a polarizing conversion device on the light exit surface, and a polarizing reflection device with alternating first and second regions on the polarizing reflectors, which refract and reflect light rays to meet optical path requirements within a smaller area, reducing the device's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sufficient optical path is provided for light ray propagation, then accurate imaging and display at human eye position is achieved, but the device size becomes bulky and inconvenient for wearing
Solution Approach 1:
The patent transforms the optical path from a linear one-dimensional arrangement into a multi-dimensional folded structure by introducing multiple reflection surfaces. The light path is folded back and forth between the display and the eye through strategic placement of reflective surfaces, effectively packing a long optical path into a compact three-dimensional space, thereby achieving accurate imaging without increasing device volume
Solution Approach 2:
The optical path is divided into multiple segmented sections, each contributing a portion of the total light propagation distance. By segmenting the path and arranging these segments in a folded configuration between the display and the eye, the patent achieves the required cumulative optical path length while maintaining a compact overall device structure that is suitable for wearing
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 solution enables a compact head-mounted display device that is more convenient for users to wear and use while maintaining effective light ray propagation and image display at the human eye position.
Implementation Method 1
light rays pass through the transflective film, via which one part of the light rays are reflected, and the other part of the light rays are transmitted
Implementation Method 2
Light rays transmitting through the transflective film pass through the lens body
Implementation Method 3
Light rays transmit to the polarizing conversion device, the polarization state of the light rays is converted to the first polarization state
Implementation Method 4
the first polarizing reflector includes in a surface thereof a first region and a second region, the first region transmitting light rays in the first polarization state, the second region reflecting light rays in the first polarization state and transmitting light rays in the second polarization state
Implementation Method 5
the second polarizing reflector reflects light rays in the second polarization state and transmits light rays in the first polarization state
Data Source
AI summary
Disclosed are an optical lens assembly, an optical system and a head-mounted display device. The optical lens assembly includes: a lens body including a light incident surface through which light rays enter and a light exit surface through which light rays exit; a transflective film provided on the light incident surface; a polarizing conversion device provided on the light exit surface; and a polarizing reflection device provided on one side of the polarizing conversion device facing away from the lens body, the polarizing reflection device comprising a first polarizing reflector and a second polarizing reflector provided sequentially along a propagation direction for light rays.