Large-field-angle eyepiece optical system and head-mounted display device

Abstract

The invention relates to a large-field-angle eyepiece optical system and a head-mounted display device, and the system comprises a first lens group, a second lens group and a third lens group, which are coaxially and sequentially arranged from a human eye observation side to a miniature image display side in the direction of an optical axis. The effective focal lengths of the first lens group, the second lens group and the third lens group are positive, negative and positive combinations; the first lens group comprises a first lens close to the human eye side and a second lens far away from the human eye side; the first lens group comprises at least two Fresnel optical surfaces; the first lens comprises at least one Fresnel optical surface; the second lens group includes a third lens adjacent to the first lens group; the third lens is a negative lens; the third lens group comprises a fourth lens and a fifth lens which are adjacent to the second lens group and are sequentially arranged along the optical axis; and the fourth lens and the fifth lens are positive lenses. The system can simultaneously realize indexes such as large field angle, high image quality, low distortion, small field curvature, small volume and the like.

Description

technical field [0001] The invention relates to the field of optical technology, more specifically, to an eyepiece optical system with a large viewing angle and a head-mounted display device. Background technique [0002] With the continuous development of electronic devices towards ultra-miniaturization, as well as the development of new computer, microelectronics, optoelectronic devices and communication theories and technologies, wearable computing, a new model based on "people-oriented" and "integration of man and machine" has become possible. . Applications are emerging in military, industrial, medical, education, consumer and other fields. In a typical wearable computing system architecture, the head-mounted display device is a key component. The head-mounted display device guides the video image light emitted by the micro-image display (such as transmissive or reflective liquid crystal display, organic electroluminescent device, DMD device) to the user's pupil throu...

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Problems solved by technology

[0004] The Fresnel structure that patent document 1 (Chinese Patent Publication No. CN109416469A), Patent Document 2 (Chinese Patent Publication No. CN105759424B), Patent Document 3 (Chinese Patent Publication No. CN107015361B), and Patent Document 4 (Chinese Patent Publication No. CN111381371A) adopt respectively Although good focusing effects can be achieved in the optical system, Patent Document 1 and Patent Document 3 completely rely on Fresnel lenses, while Patent Document 2 and Patent Document 4 are based on Fresnel lenses and single-element or double-element positive lenses. Combination, it is inevitable that it is difficult to make achievements in the aberration of the optical system, there is a lot of distortion and spherical aberration

[0005] What Patent Document 5 (Chinese Patent Publication No. CN105278109A) provides is to have adopted the optical system of combination of positive, negative and positive lens groups. What is provided is the optical system that has adopted the combination of positive, negative and positive lens groups. It is a traditional spherical and even-order aspheric optical system. Although it has great advantages in aberration correction, it is extremely bulky under the same optical system parameters.

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