Display device

Abstract

The invention discloses a display device which comprises an image projection device and first to N-th waveguide layers. The first waveguide layer to the N-th waveguide layer are sequentially arrangedfrom near to far away from the image projection device, a coupling-in part used for coupling the image light into the waveguide layer is arranged in a first preset area of each waveguide layer, and acoupling-out part used for coupling the image light propagated in the waveguide layer out of the waveguide layer is arranged in a second preset area of each waveguide layer. The coupling-in part of the first waveguide layer is used for coupling the image light projected by the image projection device into the first waveguide layer, and the coupling-in part of the i-th waveguide layer is used for coupling the image light which is not coupled into the previous waveguide layer and is transmitted out of the first preset area of the previous waveguide layer into the i-th waveguide layer. Accordingto the display device, the multiple waveguide layers are arranged, and the image light which is not coupled into the waveguide layers by the previous waveguide layer can be coupled again by the next waveguide layer, so that the light leakage can be reduced, the light energy utilization rate is increased, and the performance and the user experience of the display device are improved.

Description

technical field [0001] The invention relates to the technical field of virtual reality display, in particular to a display device. Background technique [0002] Augmented reality (augment reality, AR) display is to combine the virtual image obtained by simulation with the real scene and display it to the user, so that the user can receive the virtual image information and the real image information at the same time, so as to achieve a sensory experience beyond reality. Augmented reality display has been widely used in entertainment, education, industry, transportation, medical treatment, tourism and other industries. [0003] The traditional augmented reality display system adopts the transmissive optical display method. In order to realize the optical transmissive augmented reality display scheme, a traditional optical system based on a bird bath or a free-form surface element is designed, and the virtual image and the real scene are superimposed by using refraction and ref...

AI Technical Summary

Problems solved by technology

[0005] However, in this kind of augmented reality display system, there is light leakage in the waveguide coupling area, and the light energy utilization rate is low, which is mainly caused by the following two reasons: one is the 0-order outgoing light of the incident light on the diffraction grating; When the light entering the waveguide enters the grating in the coupling area again, it will also be coupled out of the waveguide due to diffraction.

Images