Near-Eye Display Optical Cavities for Small Volume and Large Field Angle
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Solution Overview
Problem
Existing near-eye display devices are bulky in size and have a small field angle, causing discomfort when worn and limiting the viewing experience.
Innovation Solution
A near-eye display device design incorporating a first and second optical cavity with refractive elements, including prisms, reflective polarizing film prisms, and array lenses, to reduce thickness and enhance field angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional optical structures are used in near-eye display devices, then the device can achieve basic display function, but the device becomes bulky in size and thickness
Solution Approach 1:
The patent implements nesting by placing multiple optical components (prisms, lenses, mirrors) inside enclosed optical cavities. The first optical cavity contains a first prism, first reflective polarizing film prism, phase delay film, and wedge-shaped lens. The second optical cavity contains multiple array lenses. This nested arrangement allows compact integration of complex optical functions while maintaining a small overall device volume and thickness.
Solution Approach 2:
The patent transitions from traditional planar optical arrangements to three-dimensional optical cavities. By configuring optical components in spatial sequences within volumetric cavities rather than flat layers, the system achieves compact thickness while maintaining optical path length and functionality. The optical elements are arranged in sequential order within the cavities, utilizing spatial dimensionality to reduce device footprint.
2Area of stationary object
If traditional optical structures are used in near-eye display devices, then the device can achieve basic display function, but the field angle becomes too small (below 50°)
Solution Approach 1:
The patent segments the optical system into distinct functional modules: a first optical cavity for initial light manipulation, a second optical cavity for additional optical processing, and a first reflector for light redirection. Each cavity contains specific optical elements (prisms, lenses, polarizing films) that perform particular functions. This segmentation allows optimization of each module for field angle expansion while keeping the overall system manageable in complexity.
Solution Approach 2:
The patent employs dynamic optical path configuration through the sequential arrangement of multiple optical elements that can manipulate light direction and angle. The wedge-shaped lens and array lenses are configured to dynamically expand the field angle through their specific optical properties. The oblique arrangement of the first reflective polarizing film prism and first reflector further dynamically redirects light to achieve larger field angles.
3Area of stationary object
If multiple optical components are added to increase field angle, then the field angle improves, but the device thickness increases
Solution Approach 1:
The patent places multiple optical components (prisms, lenses, mirrors) inside enclosed optical cavities. The first optical cavity contains a first prism, first reflective polarizing film prism, phase delay film, and wedge-shaped lens. The second optical cavity contains multiple array lenses. This nested arrangement allows compact integration of complex optical functions while maintaining a small overall device volume and thickness.
Solution Approach 2:
The patent transitions from traditional planar optical arrangements to three-dimensional optical cavities. By configuring optical components in spatial sequences within volumetric cavities rather than flat layers, the system achieves compact thickness while maintaining optical path length and functionality. The optical elements are arranged in sequential order within the cavities, utilizing spatial dimensionality to reduce device footprint.
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 achieves a compact form factor and a larger field angle, enhancing user comfort and viewing experience.
Implementation Method 1
a first reflective polarizing film prism
Implementation Method 2
be reflected by the first reflective polarizing film prism
Implementation Method 3
a phase delay film
Implementation Method 4
a wedge-shaped lens
Implementation Method 5
be reflected into the multiple array lenses through the first reflective polarizing film prism, enter the first reflector through one end of the multiple array lenses
Implementation Method 6
be reflected back to the multiple array lenses through the first reflector
Data Source
AI summary
A near-eye display device includes a first optical cavity, a second optical cavity and a first reflector. The first optical cavity includes a first prism, a first reflective polarizing film prism, a phase delay film, a wedge-shaped lens and a second prism disposed in sequential order. The second optical cavity includes multiple array lenses disposed in sequence. The first reflector is disposed in correspondence with one end of the multiple array lenses and the first reflective polarizing film prism. The near-eye display device of the present disclosure can ensure that the near-eye display device has a small volume, a small thickness, and a large field angle.