Beam splitter for wearable display and manufacturing method thereof

Abstract

The invention discloses a beam splitter for a wearable display and a manufacturing method thereof. The beam splitter comprises two identical rectangular prisms. The inclined planes of both the rectangular prisms face each other and are fixed together. Multi-layer film piles formed by crossed lamination of high and low refractive index material layers are disposed between the two inclined planes. The multi-layer film piles selectively reflect an RGB (red, green and blue) LED light source of s-polarized light, transmits other wave bands of the s-polarized light, and transmits p-polarized light of a whole visible wave band. A glued prism polarization beam splitter and a bandpass optical filter are combined together, and appropriate high and low refractive index films are adopted to simultaneously meet a Brewster's angle, so a convetional polarization beam splitting effect is achieved. Through the design of a high and low refractive index film system, multi-channel bandpass filtering is achieved, so the energy of rest wave bands can be reutilized while specific wavelength high reflection can be realized, and therefore the energy utilization rate of applications of the polarization beam splitter to a helmet display or the like is greatly increased. The beam splitter is easy to manufacture, is low in cost, and is convenient for large scale and batch production.

Description

technical field [0001] The invention relates to an optical element, in particular to a beam splitter with high energy utilization rate and a preparation method thereof, which can be applied to fields such as wearable displays. Background technique [0002] A beam splitter is an optical element that coats one or more layers of film on optical glass so that a beam of light is projected onto the coated glass, and the beam is divided into two or more beams through reflection, transmission and refraction. Currently commonly used beam splitters include plate beam splitters, cube beam splitters, and polka lattice beam splitters. These beam splitters are mainly used to split an incident light beam into two beams of transmitted and reflected light with a certain intensity ratio. There are two types of beam splitting mirrors with fixed beam splitting ratio and variable beam splitting ratio beam mirrors. The variable beam splitting ratio beam mirror is divided into step and continuou...

AI Technical Summary

Problems solved by technology

Therefore, in the case of using this polarizing beam splitter, half of the energy of the incident natural light will be reflected back to the external environment, so the energy utilization rate of the external incident light in this method does not exceed 50%, resulting in a great waste of energy

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