Waveguide type element and head-mounted display device using same

Abstract

The present invention relates to a waveguide type element used for the head-mounted display. The waveguide type element comprise two layers of flat plate structures, utilizes a unit reflector embedded at a predetermined position, reduces the thicknesses of a waveguide layer and a corresponding segment at the predetermined position, effectively improves the image illumination uniformity between different view fields at a same exit pupil position and the image illumination uniformity at different exit pupil positions of the same view field, avoids the obvious discontinuous images or nonuniform brightness in an emergent image, and realizes the images which do not have parasitic light and are uniform in brightness in a large view field. A head-mounted display device having the waveguide type element can realize the very thin thickness, and enables the weight loaded on the heads of users to be relieved.

Description

technical field [0001] The present invention relates to a slab waveguide element and a head-mounted display device using the same, in particular to a slab waveguide element which is light and thin and can obtain uniform image brightness in the field of view. Background technique [0002] Consumer electronics products have developed vigorously in recent years. After smart phones, consumers have generally known the concepts of virtual reality (VR) and augmented reality (augmented reality, AR), and are chasing related concept products. As an attempt to experience new technologies, display devices such as head-mounted displays (HMD) can achieve augmented reality (AR) experience or virtual reality (VR) experience through simple wearing, and are widely used in aviation, engineering, science, medical treatment, games , video, sports, training and simulation and other fields have a wide range of applications. [0003] In the way of realizing AR experience through HMD, the mode of g...

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Problems solved by technology

[0004] In order to realize the ultra-thin optical transmissive AR display solution, the design of the free-form prism element is introduced, and the optical transmissive AR is realized by using the catadioptric path and the compensating prism. In the case of a good visual experience, the thickness of the optical system of this solution cannot be very thin, which limits the further thinning of glasses-like AR displays; while other designs use planar light waveguide solutions, using light in planar waveguide components The total internal reflection effectively reduces the thickness of the optical element, but the planar waveguide element cannot provide optical power, and it needs to be used with a projection system to obtain a reasonable visual display size. If the matching degree is not good, the wearer's exit pupil position The light distribution is prone to obvious unevenness or even discontinuity, which affects the user's visual experience

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