A waveguide display system

A display system, waveguide technology, applied in optical components, instruments, optics, etc., can solve the problems of increasing system complexity and cost, increasing system cost and power consumption, small exit pupil diameter, etc., achieving simple structure, low cost, Fast response time

CN112612138BActive Publication Date: 2022-03-25BEIJING INSTITUTE OF TECHNOLOGYGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-03-25

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Abstract

A waveguide display system and method are provided. The system includes: an image source, used to generate an imaging beam; a relay collimation system, used to collimate the imaging beam into a first parallel light at the same angle; a coupler, used to collimate the first parallel light Coupled into the following waveguide to form the second parallel light; the waveguide is used to propagate the second parallel light to the following coupler in the form of total reflection; the coupler is used to diffract the second parallel light into converging the light, leaving the waveguide, and entering the following first polarization grating; the first polarization grating is used to divide the converged light into two beams of circularly polarized light with opposite rotation directions emerging at different angles; and the second polarization Two beams of circularly polarized light with opposite rotation directions are diffracted by the second polarization grating to produce two beams of laterally misaligned imaging beams and enter the eye. The system has a simple structure, and while realizing the retinal display, the diameter of the exit pupil is enlarged, and the external real scene can be viewed.
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Description

technical field

[0001] The invention belongs to the technical field of retinal projection display, and in particular relates to a waveguide display system and method. Background technique

[0002] The goal of augmented reality technology is to superimpose computer-generated virtual images, scenes or system prompt information on the display technology of real scenes. This technology can apply virtual information to the real world, and effectively improve the user's perception and interaction experience of the real world through the information provided by the computer system, so it has received great attention from researchers. However, for a common head-mounted display system, there is a problem that the distance between the virtual display image and the actual scene does not match, that is, there is a contradiction between convergence and focus. Retinal projection display technology does not need to go through the focal length adjustment of the eye lens, and directly proje...

Examples

Embodiment 1

[0050] According to a preferred embodiment of the present invention, see figure 1 , providing a waveguide display system, characterized in that it comprises:

[0051] an image source 101, configured to generate an imaging beam 201;

[0052] A relay collimation system 102, configured to collimate the imaging light beam 201 into a first parallel light 202 at the same angle;

[0053] A coupler 103, configured to couple the first parallel light 202 into the following waveguide 104 to form a second parallel light 203;

[0054] a waveguide 104, configured to propagate the second parallel light 203 to the following coupler 105 in a manner of total reflection;

[0055] an output coupler 105, configured to diffract the second parallel light 203 into converging light 204, leave the waveguide 104, and enter the following first polarization grating 106;

[0056] The first polarization grating 106 is used to divide the converged light 204 into two beams of light emitted at different ang...

Embodiment approach

[0062] According to another preferred embodiment of the present invention, the image source 101 includes LCD, LCOS, DLP, OLED or laser scanning system.

[0063] According to yet another preferred embodiment of the present invention, the coupler 103 and the coupler 105 are reflective or transmissive.

[0064] According to yet another preferred embodiment of the present invention, the output coupler 105 outputs single or multiple convergent lights 204 .

[0065] According to yet another preferred embodiment of the present invention, the first polarization grating 106 and the output coupler 105 are arranged closely or at intervals.

[0066] According to yet another preferred embodiment of the present invention, there is also provided a waveguide 104 display method, which is characterized by comprising the following steps:

[0067] generating an imaging beam 201;

[0068] collimating the imaging light beam 201 into a first parallel light 202 at the same angle;

[0069] coupling...

Embodiment 2

[0078] According to a preferred embodiment of the present invention, see figure 1 A waveguide display system is provided, including an image source, a relay collimation system, a coupler, a waveguide, a coupler, and two polarization gratings of the same type and parallel to each other.

[0079] Wherein, the image source generates an imaging light beam, which is collimated into parallel light at the same angle through a relay collimation system.

[0080] The coupler couples the parallel imaging beam into the waveguide, and the reflection angle on the inner surface of the waveguide is larger than the total reflection angle, so it can propagate to the coupler through total reflection.

[0081] The imaging light is diffracted by the outcoupler into converging light and exits the waveguide.

[0082] The imaging light enters the first polarization grating, is split into two beams, and exits at different angles. The two beams of light are circularly polarized light with opposite rot...