Optical system of helmet mounted display based on free-form surface prism

A technology of head-mounted displays and curved prisms, applied in optics, optical components, instruments, etc., can solve problems such as uncorrectable chromatic aberrations

Inactive Publication Date: 2011-04-13
中航华东光电有限公司
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  • Abstract
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Problems solved by technology

However, since the FFSM optical system only uses one kind of glass material, it cannot correct chromatic aberration and realize broadband display

Method used

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  • Optical system of helmet mounted display based on free-form surface prism
  • Optical system of helmet mounted display based on free-form surface prism
  • Optical system of helmet mounted display based on free-form surface prism

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Embodiment Construction

[0032] The present invention will be further described below with reference to the accompanying drawings in conjunction with the embodiments, so that those skilled in the art can better understand the present invention and implement it, but the given embodiments are not intended to limit the present invention.

[0033] For traditional HMD optical systems such as figure 1 and figure 2 , it is difficult to increase the viewing angle, achieve color display and reduce the volume and weight of the optical system, because for the traditional optical system to achieve color display, it is necessary to introduce a cemented lens composed of optical materials with different refractive indices to correct chromatic aberration. This increases the weight of the optical system. In order to increase the field of view, the focal length of the optical system must be reduced (reducing the radius of the concave mirror), and the aperture of the optical system has to be increased, resulting in an...

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Abstract

The invention relates to an optical system of a helmet mounted display based on a free-form surface prism. The optical system is the free-form surface prism formed by an S1 surface, an S2 surface and an S3 surface, wherein the S2 surface is a plane, and the S3 surface is a spherical surface. An overall coordinate system is firstly defined as follow: an original point O is positioned in the center of an entrance pupil; a Z axis is reversely traced from the center of the entrance pupil to the prism along a main optical axis L0; a Y axis is vertical to the Z axis and is positioned in the plane including the main optical axis L0; and an X axis is simultaneously vertical to the Y axis and the Z axis. A local coordinate system of each optical plane is then defined as follow: an original point is positioned on overall coordinates (SXi, SYi, SZi), a Zi axis passes through the original point of the local coordinate system and forms a thetai angle with the Z axis in the overall coordinate system, and a Yi axis passes through the original point and forms a right angle with the Zi axis in a symmetrical plane; and an Xi axis is vertical to coordinate axis of the Zi axis and the Yi axis, and a function expression of each optical plane is obtained according to the definition of the coordinate system, wherein a function expression of the S1 plane is a Zenike polynomial. The invention can realize the color display, effectively correct the aberration and improve the image quality.

Description

【Technical field】 [0001] The invention relates to the field of optical technology, in particular to a refraction-diffraction hybrid optical system for a light and small wide-spectrum free-form surface prism head-mounted display, which belongs to the field of optical system and device design, and is applicable to the fields of virtual reality and augmented reality. 【Background technique】 [0002] see figure 1 , The helmet-mounted display (HMD) is composed of a miniature image source and an optical system. The optical system displays a collimated image to infinity or far enough away for the pilot to observe normally through the partially reflective composite glass. In a see-through HMD, the image is superimposed with the external view and projected into the human eye. At present, most HMD optical systems are basically in the form of microscope erecting eyepieces. The whole system is roughly composed of three parts: relay optical system, eyepiece system and optical combinatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/01G02B27/00G02B17/08
Inventor 杨新军董戴张肖强闫记香李刚
Owner 中航华东光电有限公司
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