Optical device of head-mounted display

Abstract

The invention provides an optical device of a head-mounted display. The optical device comprises a direct type mini LED backlight module, an optical fiber film, an LCD panel and an imaging lens. The optical fiber film comprises an optical fiber array, one end of the optical fiber array is provided with a coupled light input surface used for receiving the area light source, and the other end of the optical fiber array is provided with a coupled light output surface which faces the eye physically and is used for emitting light, the surface area of the coupling light input surface is not smaller than the surface area of the coupling light output surface so that the light emitting brightness of the area light source can be improved. The optical device of the head-mounted display has the advantages of being narrow in light emitting angle and small in optical loss.

Description

technical field [0001] The invention relates to the field of optical systems and display technologies, in particular to an optical device for a head-mounted display. Background technique [0002] Head Mounted Displays (HMDs) are widely used in various fields, including engineering design, medical surgery practice, military simulation practice and video games. For example, if a user wears an HMD while playing a video game, the user can gain more interactive experience in the virtual environment. Unlike other types of display devices, the HMD is directly worn on the user's head, so the HMD can directly contact the user's face, but this also brings two problems. On the one hand, a certain number of LED chips are used inside the HMD, and the large amount of heat generated by these chips will directly radiate to the user's face, causing discomfort to the user; on the other hand, typical active cooling devices, such as fans, are used to cool the HMD Internally, these cooling dev...

AI Technical Summary

Problems solved by technology

[0004] In addition, the angular divergence range of traditional optical devices can exceed 160 degrees, even close to 180 degrees. When viewed directly, this wide-angle light usually does not cause undesired visual effects

However, when a conventional optical device is used in a virtual reality or augmented reality HMD, when light emitted from a wide angle hits the lens of the HMD at an incident angle exceeding the imaging capability of the lens, such light will not be correctly imaged to the user's One or both eyes, that is, light entering at angles beyond the focusing capabilities of the HMD's lens or lenses can cause undesired visual effects such as flood lighting, ghosting, glare, scattering, and other stray light effect

This stray non-imaging light can cause users of virtual reality or augmented reality HMDs to experience undesired visual artifacts

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