CN114153071A

CN114153071A - Ar-hud

Info

Publication number: CN114153071A
Application number: CN202111242671.5A
Authority: CN
Inventors: 冯学贵
Original assignee: Jiangsu Zejing Automobile Electronic Co ltd
Current assignee: Jiangsu Zejing Automobile Electronic Co ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-03-08

Abstract

The invention discloses an AR-HUD (augmented reality-augmented reality) which relates to the technical field of HUDs and comprises a first reflector, a second reflector, a diffusion screen and a projection module, wherein the first reflector, the second reflector and the diffusion screen are arranged in a triangular mode, the projection module is close to the direction of the diffusion screen, the projection module comprises a lens group and an image generation device, the lens group and the diffusion screen are sequentially arranged along the light emitting direction, the projection module further comprises a positive focal power lens, and the positive focal power lens is close to the diffusion screen. According to the invention, the positive focal power lens is added below the diffusion screen, so that the distance between the lens group and the diffusion screen can be shortened, and the whole projection module is compact in volume; meanwhile, more light energy can enter the eye box area, and the light energy utilization rate is effectively improved. Similarly, the uniformity of the image watched by the eye box area is improved on the premise of not reducing the light energy utilization rate.

Description

AR-HUD

Technical Field

The invention relates to the technical field of HUDs, in particular to an AR-HUD.

Background

Head-Up displays (HUDs) are early flight aids for aircraft. In the present stage, the HUD is widely applied to automobiles, and the principle of the HUD is that an image on an image source is reflected by one or two reflectors and projected onto automobile windshield glass, and a high-brightness virtual image is formed in front of human eyes. A general HUD generally uses an LCD as an image source.

The AR-HUD is an augmented reality head-up display, and its FOV is large, the size of the image displayed by projection is large, and the projection distance is long compared to a conventional HUD. If the LCD is used as an image source, when the solar energy is converged on the image source through the first reflector and the second reflector, the LCD is heated rapidly, which often causes damage or burnout of the LCD screen.

Based on the technical scheme, one solution to the solar burn-in is to use a diffusion screen instead of the LCD and form an image source on the diffusion screen through a projection module. The existing AR-HUD uses an intermediate image source, the uniformity of images in an eye box is low, and the brightness difference of the images at different positions of the eye box is obvious. In order to improve the uniformity of the image, the brightness of the image is greatly lost, the power consumption of the system is increased, and the heat dissipation difficulty is improved. In addition, the distance between the projection module lens group and the diffusion screen is long, and the volume of the projection module is large.

Disclosure of Invention

The technical problem to be solved by the invention is to provide an AR-HUD, which solves the technical problems that the existing AR-HUD is poor in image uniformity, the loss of image brightness is high, the system power consumption is increased, the heat dissipation difficulty is increased and the size of a projection module is large in order to improve the image uniformity.

In order to solve the technical problems, the technical scheme of the invention is as follows:

the utility model provides a AR-HUD, includes first speculum, the second mirror, diffusion screen and projection module, first speculum, the second mirror and diffusion screen are the triangle and arrange, projection module is close to diffusion screen direction, projection module includes lens group and image generation device, lens group and diffusion screen are arranged along luminous direction in proper order, projection module still includes a positive focal power lens, positive focal power lens are close to the diffusion screen.

Further, the distance between the positive focal power lens and the diffusion screen is 0.5 mm-20 mm.

Further, one side of the positive focal power lens, which is close to the diffusion screen, is a concave surface, a plane or a convex surface; and one side of the positive focal power lens, which is far away from the diffusion screen, is a convex surface, a concave surface or a plane.

Preferably, the focal length of the positive power lens is 50mm to 2000 mm.

Further, the distance between the exit pupil position of the projection module and the diffusion screen is L1, and the distance between the lens group and the diffusion screen is L2.

Further, L1 is 1.2 XL 2 or more.

Further, the positive power lens is a cylindrical lens, and the corresponding diffusion screen direction is the length direction.

By adopting the technical scheme, the positive focal power lens is added below the diffusion screen, the distance between the lens group and the diffusion screen can be shortened, and the whole projection module is compact in size. Meanwhile, more light energy can enter the eye box area, and the light energy utilization rate is effectively improved. Similarly, the uniformity of the image watched by the eye box area is improved on the premise of not reducing the light energy utilization rate.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a schematic diagram of the AR-HUD of the present invention;

FIG. 2 is a schematic diagram of a projection module in the AR-HUD of the present invention;

FIG. 3 is a schematic diagram of the optical path of the projection module in the AR-HUD of the present invention;

FIG. 4 is a schematic view of a cylindrical lens in the AR-HUD of the present invention.

In the figure, 1-eye box area, 2-windshield, 3-first reflector, 4-second reflector, 5-diffusion screen, 6-lens group, 7-image generation device, 8-projection module, 9-positive power lens, 10-exit pupil position.

Detailed Description

To further illustrate the technical means and effects of the present invention for achieving the predetermined objects, the following detailed description will be given of the embodiments, structures, features and effects of the method and system for nucleic acid sample collection and management according to the present invention with reference to the accompanying drawings and preferred embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

As shown in fig. 1-3, the AR-HUD of the present invention comprises a first reflector, a second reflector, a diffuser screen, and a projection module, wherein the first reflector, the second reflector, and the diffuser screen are arranged in a triangular manner, the projection module is close to the direction of the diffuser screen, the projection module comprises a lens group and an image generating device, the lens group, and the diffuser screen are sequentially arranged along a light emitting direction, the projection module further comprises a positive focal power lens, and the positive focal power lens is close to the diffuser screen.

Further, one side of the positive focal power lens, which is close to the diffusion screen, is a concave surface, a plane or a convex surface, and a concave surface is preferably selected; the side of the positive power lens far away from the diffusion screen is a convex surface, a concave surface or a plane, preferably a convex surface, and the material can be optical glass or plastic.

Preferably, the focal length of the positive power lens is 50mm to 2000 mm. The positive power lens may have an aspherical surface, a free-form surface.

Further, as shown in fig. 3, the distance between the exit pupil position of the projection module and the diffusion screen is L1, and the distance between the lens group and the diffusion screen is L2.

Furthermore, according to the optical imaging principle, the distance between the exit pupil position and the diffusion screen can be increased by adding the positive focal power lens at one side of the diffusion screen, so that L1 is far greater than L2, generally, L1 is not less than 1.2 xL 2, more light energy can enter the eye box area, and the light energy utilization rate is effectively improved.

According to the invention, the positive focal power lens is added below the diffusion screen, so that the distance between the lens group and the diffusion screen is shortened, and the occupied volume is correspondingly shortened. If the same distance is achieved without adding a lens, the diameter of the lens group is greatly increased, which is not favorable for design. Therefore, the distance between the lens group and the diffusion screen can be shortened by adding the positive focal power lens under the diffusion screen, so that the whole projection module is compact in volume.

Based on the same principle, as shown in fig. 3, the lens group and the positive power lens group constitute one lens. The distance L1 between the exit pupil and the diffusion screen is far greater than the distance L2 between the lens group and the diffusion screen. In general, L1 is 1.2 XL 2 or more. And the light path is propagated by the image generation device, passes through the lens and finally reaches the diffusion screen.

In the invention, the lens group is a lens group consisting of a plurality of lenses, and the lens group and the positive focal power lens form a clear imaging lens.

In the invention, the positive focal power lens can converge light, so that more light energy can enter the eye box area, and the light energy utilization rate is effectively improved. Similarly, the uniformity of the image watched by the eye box area is improved on the premise of not reducing the light energy utilization rate.

As shown in fig. 4, the positive power lens is a cylindrical lens, and the corresponding diffusion screen direction is the longitudinal direction.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides an AR-HUD, includes first speculum, second mirror, diffuse screen and projection module, first speculum, second mirror and diffuse screen are the triangle and arrange, projection module is close to the diffuse screen direction, projection module includes lens group and image generation device, lens group and diffuse screen are arranged along luminous direction in proper order, its characterized in that, projection module still includes an orthofocal power lens, orthofocal power lens is close to the diffuse screen, projection module's exit pupil position is L1 with the distance of diffuse screen, the distance of lens group and diffuse screen is L2, wherein, L1 is more than or equal to 1.2X L2.

2. An AR-HUD according to claim 1, wherein the distance between said positive power lens and said diffuser screen is in the range of 0.5mm to 20 mm.

3. An AR-HUD according to claim 2, wherein the side of the positive power lens adjacent the diffuser screen is concave, planar or convex; and one side of the positive focal power lens, which is far away from the diffusion screen, is a convex surface, a concave surface or a plane.

4. An AR-HUD according to claim 3, wherein said positive power lens has a focal length of 50mm to 2000 mm.

5. An AR-HUD according to claim 3, wherein the positive power lens is a cylindrical lens having positive power along the length of the diffuser screen.