Pupil expanding device and AR equipment

Abstract

The invention discloses a pupil expanding device and AR equipment, and belongs to the technical field of optical display. The pupil expanding device comprises a first pupil expanding unit, a second pupil expanding unit and a third pupil expanding unit, the first pupil expanding unit comprises N first beam splitters arranged in the first direction, and the first beam splitters and the first direction form a first included angle; the second pupil expanding unit comprises M second beam splitters arranged along the first direction, a second included angle is formed between the second beam splitters and the first direction, the first pupil expanding unit and the second pupil expanding unit are arranged along the first direction, and the exit pupil is arranged between the first pupil expanding unit and the second pupil expanding unit; the third pupil expanding unit comprises P third beam splitters arranged in the second direction, the third beam splitters and the substrate are arranged at third included angles, and the third pupil expanding unit is arranged on one side of the first pupil expanding unit and the second pupil expanding unit in the second direction. According to the pupil expanding device and the AR equipment, the structure is simple, the processing difficulty and cost are reduced, and the light energy utilization rate is improved.

Description

technical field [0001] The invention relates to the field of optical display technology, in particular to a pupil dilator and AR equipment. Background technique [0002] Augmented reality (Augmented Reality, AR) technology is a technology that ingeniously integrates virtual information with the real world. This head-mounted display using augmented reality technology allows people to project virtual images onto people while viewing their surroundings. Eyes are of great significance in military, industrial, entertainment, medical, transportation and other fields. At present, the main technologies of transmissive head-mounted displays for augmented reality include: Birdbath, prism, free-form surface and optical waveguide technology. Compared with other technologies, head-mounted displays using optical waveguide technology are smaller. [0003] Among the existing AR systems, one is to use one-dimensional pupil dilation technology, such as figure 1 Shown is a one-dimensional ar...

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Problems solved by technology

[0005] In practice, in order to achieve a good imaging effect, this series of beam splitters 103" need to be optically processed and then glued, and their parallelism and density have high requirements, which not only makes the light go through multiple beam splitting and The energy loss after the glue layer also increases the difficulty of processing and makes the cost higher

The structure and processing technology of the two-dimensional array optical waveguide 100" will be more complicated, resulting in an increase in cost

In addition, if Figure 4 As shown, taking the far-end light 302" at the edge of the eye box as an example, it needs to pass through three to four beam splitters 103" when it reaches the eye box, and the multi-layer beam splitter 103" used in the horizontal pupil dilation will reduce the The utilization rate of light energy reduces the brightness emitted by the system

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