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Optical see-through free-form head-mounted display

a free-form, head-mounted display technology, applied in optics, projectors, instruments, etc., can solve the problems of large eye relief, low f-number, compact and non-intrusive ost-hmd, and difficult non-pupil forming systems, and achieve the effect of minimizing the shift and distortion of rays

Inactive Publication Date: 2012-04-05
CHENG DEWEN +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]In one of its aspects, the present invention provides a free-form prism-lens for use in an optical see-through head-mounted display. The prism-lens may include a first free-form surface configured to receive light from a micro-display and configured to transmit the received light into the body of the prism-lens, and a second free-form surface configured to receive the light transmitted into the body of the prism-lens from the first free-form surface and configured to totally internally reflect the received light at the second surface. In addition, prism-lens may also include a third free-form surface configured to receive the light reflected by the second free-form surface and configured to reflect the light out of the prism-lens and may have an f-number less than 3.5. The prism-lens may optionally include an auxiliary lens disposed proximate the third free-form surface. The auxiliary lens may be configured to minimize the shift and distortion of rays from a real-world scene by the second and third surfaces of the prism-lens.

Problems solved by technology

On the other hand, designing a wide field of view (FOV), low F-number, compact, and nonintrusive OST-HMD has been a great challenge, especially difficult for a non-pupil forming system.
The typical eyepiece structure using rotationally symmetric components has limitations in achieving low F-number, large eye relief, and wide FOV.
It is challenging, however, to design a free-form prism based OST-HMD offering a wide FOV, low F-number, and sufficient eye relief.
The reduced focal length makes it very challenging to design a system with a large exit pupil.
As a result, most of the designs compromise the exit pupil diameter.
The existing work shows that it is extremely difficult to achieve a very fast (low F / #) and wide field of view HMD design with a single wedge-shaped free-form surface prism.

Method used

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  • Optical see-through free-form head-mounted display
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Embodiment Construction

[0026]The desire to achieve an optical see-through head-mounted display having a compact, light-weight, and nonintrusive form factor argues for a design having as few optical elements as possible. Accordingly, exemplary designs of the present invention provide a single-element prism-lens 110, 710 which has sufficient optical power on its own to deliver light from a micro-display 130 to a user, FIGS. 1, 6. However, providing a single optical element, such as the prism-lens 710, in which all the optical power resides can lead to greatly increased aberrations with accompanying loss in resolution and image quality, especially for low F / # systems. Despite these challenges, as a result of the lens design procedures and work described below, the present invention provides a single-element prism-lens 710 based on a 0.61″ microdisplay 130, which offers a diagonal FOV of 53.5°, an F / # of 1.875, an exit pupil diameter of 8 mm, and an eye relief of 18.25 mm. In addition, in order to maintain a ...

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Abstract

A see-through free-form head-mounted display including a wedge-shaped prism-lens having free-form surfaces and low F-number is provided.

Description

RELATED APPLICATIONS[0001]This application claims the benefit of priority of U.S. Provisional Application No. 61 / 214,117, filed on Apr. 20, 2009, the entire contents of which application are incorporated herein by reference.GOVERNMENT RIGHTS[0002]This invention was made with government supports under contract numbers 0644446 awarded by the U.S. National Science Foundation, 60827003 awarded by the National Natural Science Foundation of China, and 2009AA01Z308 awarded by the Hi-Tech Research and Development Program of China. The U.S. and Chinese governments have certain rights in the invention.FIELD OF THE INVENTION[0003]The present invention relates generally to a see-through free-form head-mounted display, and more particularly, but not exclusively to a wedge-shaped prism-lens having free-form surfaces configured to provide a low F-number heretofore unachieved.BACKGROUND[0004]Optical see-through head-mounted displays (OST-HMD) find myriads of applications from scientific visualizati...

Claims

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Application Information

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IPC IPC(8): G02B17/08
CPCG02B17/08G03B21/00G02B17/086G02B27/0172G02B2027/0118G02B2027/013G02B13/10G02B27/017G02B17/006
Inventor CHENG, DEWENHUA, HONGWANG, YONGTIAN
Owner CHENG DEWEN
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