Head Mount Display Optical System Seam Elimination
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Solution Overview
Problem
The seam between the outer edges of the compensation device and the light-splitting device in head mount displays causes light deflection and scattering, affecting the imaging effect when worn by a user.
Innovation Solution
An optical system comprising a first lens, a beam splitter lens, a compensating lens, and a phase retarder, where the phase retarder's extension aligns with the beam splitter lens's outer edge to eliminate the seam, and a polarizing reflector is used to manage light polarization, ensuring no visible seam and improved imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a compensation device is added to compensate for the focal power of the light-splitting device, then the imaging effect is improved, but a seam is formed between the compensation device and the light-splitting device causing light deflection and scattering
Solution Approach 1:
The patent combines the compensation device and light-splitting device into a single integrated optical element, eliminating the seam between them. The compensation lens and beam splitter are merged into one component that performs both functions simultaneously, thus preventing light deflection and scattering at the interface.
Solution Approach 2:
The patent introduces a phase retarder as an intermediary element positioned between the compensation lens and beam splitter. This phase retarder with extension structure fills the gap between components and aligns its outer edge with the beam splitter's outer edge, preventing the formation of a visible seam and reducing light scattering.
2Length of stationary object
If multiple turns of optical path are adopted to reduce the thickness of the head mount display, then the size is reduced, but the optical system becomes more complex requiring additional devices
Solution Approach 1:
The patent employs optical elements that perform multiple functions simultaneously. The beam splitter serves both as a light-splitting device and a compensating device, while the phase retarder with extension structure provides both waveplate functionality and seam-filling functionality. This multi-functionality reduces the number of separate components needed in the folded optical path.
Solution Approach 2:
The patent implements a nested structure where the phase retarder's extension is positioned within the optical path between existing components. The extension structure of the phase retarder is nested between the beam splitter and compensation lens, filling the gap without adding external bulk to the optical system.
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 optical system prevents light scattering and ensures a seamless imaging experience by aligning the outer edges of the phase retarder extension with the beam splitter lens, eliminating the seam and maintaining the display's normal operation.
Implementation Method 1
a polarizing reflector provided on a side of the first lens distal to the light input-coupling end-face, light being incident into the first lens from the light input-coupling end-face and reflected to the polarizing reflector via at least one of the first surface and the second surface
Implementation Method 2
a phase retarder provided on the beam splitter lens or on the second lens, comprising a body and an extension
Data Source
AI summary
The present disclosure provides an optical system and a head mount display, the optical system comprises: a first lens with a first surface and a second surface provided oppositely, the first lens comprising a light input-coupling end-face connected with the first surface and the second surface; a polarizing reflector disposed at a side of the first lens away from the light input-coupling end-face; a beam splitter disposed on a side where the second surface of the first lens is located; a second lens disposed between the beam splitter and the first lens; and a phase retarder disposed on the beam splitter or on the second lens, comprising a body and an extension, the body being disposed corresponding to a middle region of the beam splitter, the extension extending from the body toward an outer edge of the beam splitter, and an outer edge of the extension being aligned with the outer edge of the beam splitter.