Optical device for augmented reality with virtual image depth adjustment function

By using small reflection modules and a focus tracking system in augmented reality optical devices, the positions of the display unit and the imaging optical system are adjusted in real time, solving the problems of complex structure and misalignment of virtual images in existing devices, and achieving clear virtual image display.

CN116710833BActive Publication Date: 2026-07-21LETINAR CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
LETINAR CO LTD
Filing Date
2021-07-09
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing augmented reality optical devices are complex in structure, heavy, bulky, and expensive. Users also need to manually adjust the focal length or rely on additional hardware, which causes virtual images to be misaligned or split at the boundaries of multiple reflective surfaces.

Method used

By employing multiple reflection modules smaller than the pupil size, combined with a focus tracking unit and a position adjustment device, the position or focus of the display unit and the imaging optical system is adjusted in real time by the control unit to ensure that the depth of the virtual image matches the user's focus.

Benefits of technology

It achieves the goal of maintaining the clarity of virtual images while the user is looking at the real world, preventing virtual images from being misaligned or split at the boundaries of multiple reflective surfaces, and improving the user experience.

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Abstract

The present application discloses an augmented reality optical device with virtual image depth adjustment function, comprising: a display unit for displaying a virtual image; an imaging optical system for refracting or reflecting virtual image light emitted by the virtual image displayed on the display unit; a reflection unit composed of a plurality of reflection modules for reflecting and transmitting the virtual image light refracted or reflected by the imaging optical system towards the pupil of the user's eye, thereby providing the user with the virtual image; an optical mechanism configured with the reflection unit composed of a plurality of reflection modules for transmitting real object image light emitted by a real object towards the pupil of the user's eye; a position adjustment device for moving at least one of the display unit and the imaging optical system in a direction parallel to the optical axis of the imaging optical system; a focal length tracking unit for measuring the focal length of the user; and a control unit for controlling the movement of the position adjustment device based on the focal length of the user measured by the focal length tracking unit; the control unit controls the movement of the position adjustment device so that the depth of the virtual image displayed on the display unit corresponds to the focal length of the user measured by the focal length tracking unit.
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