Geometric Phase Lens Optics for Compact Focus Adjustment
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Solution Overview
Problem
Existing display devices and head-mounted display devices face challenges in reducing the volume and weight of focus adjustable optical systems, leading to user fatigue.
Innovation Solution
Incorporating a display unit with a geometric phase lens, polarized light change elements, and a lens portion including half mirrors and reflectors, which utilize quarter-wave and half-wave plates to minimize the number of optical elements and adjust focal distances efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional optical systems are used for focus adjustment, then focal distances can be adjusted, but the volume and weight of the optical system increase
Solution Approach 1:
The patent combines multiple optical elements (half mirrors, reflectors, quarter-wave plates, half-wave plates) into an integrated optical system where components are merged to achieve focus adjustment functionality. This consolidation reduces the overall number of separate elements while maintaining the ability to adjust focal distances through coordinated operation of the combined components.
Solution Approach 2:
The optical elements in the patent serve multiple functions simultaneously. For example, the quarter-wave plates and half-wave plates not only control polarization states but also contribute to focal distance adjustment. The half mirrors and reflectors serve both to direct light paths and to enable focus variation, reducing the need for dedicated separate components for each function.
2Ease of operation
If traditional optical systems are used for focus adjustment, then focal distances can be adjusted, but the volume of the optical system increases
Solution Approach 1:
The patent integrates multiple optical elements into a compact arrangement where half mirrors, reflectors, and wave plates are combined in a space-efficient configuration. This merging approach allows the system to achieve focus adjustment functionality without requiring large volumes that would be necessary if each component were implemented as a separate adjustable element.
Solution Approach 2:
The patent utilizes polarization dimension to achieve focus adjustment. By controlling the polarization state of light through quarter-wave plates and half-wave plates, the system can adjust focal distances without requiring mechanical movement or large spatial changes in the optical path, thereby reducing the overall volume of the optical system.
3Weight of stationary object
If the number of optical elements is reduced, then volume and weight decrease, but optical system complexity increases
Solution Approach 1:
The patent employs optical elements that perform multiple functions simultaneously. The quarter-wave plates and half-wave plates control both polarization states and contribute to focal distance adjustment, while half mirrors and reflectors direct light paths and enable focus variation. This multi-functionality reduces the total number of components needed while maintaining comprehensive optical control capabilities.
Solution Approach 2:
The patent achieves focus adjustment by changing the polarization parameters of light rather than by mechanically moving optical elements or changing their physical configurations. By controlling the polarization state through wave plates, the system can adjust focal distances through parameter changes in the light itself, reducing the need for additional mechanical adjustment components.
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 reduces the volume and weight of the optical system, thereby minimizing user fatigue by optimizing the focal adjustments and reducing the number of components.
Implementation Method 1
a geometric phase lens, a polarized light change element between the first surface of the display unit and the geometric phase lens
Implementation Method 2
The polarized light change element may include a linear polarizer, a first half-wave plate, and a first quarter-wave plate
Implementation Method 3
a lens portion between the polarized light change element and the geometric phase lens, and including a half mirror, a lens, and a reflector
Data Source
AI summary
A display device includes a display unit including a first surface on which an image is displayed, and a second surface opposite to the first surface, a geometric phase lens, a polarized light change element between the first surface of the display unit and the geometric phase lens, and a lens portion between the polarized light change element and the geometric phase lens, and including a half mirror, a lens, and a reflector.