CN-121995630-A - Head-up display device

CN121995630ACN 121995630 ACN121995630 ACN 121995630ACN-121995630-A

Abstract

The application provides a head-up display device. The head-up display device comprises an image device and at least one diffraction optical waveguide, wherein the image device is configured to emit light rays carrying image information, the diffraction optical waveguide is provided with a transparent waveguide substrate, and a coupling-in structure and a coupling-out structure which are positioned on the surface or in the transparent waveguide substrate, the coupling-in structure is configured to receive the light rays projected by the image device and make the light rays conduct through total reflection in the transparent waveguide substrate, the coupling-out structure is configured to make the light rays conducted in the transparent waveguide substrate couple out of the transparent waveguide substrate, and make the coupled light rays enter an eye movement area approximately in parallel after being reflected by a windshield, and the coupled light rays are non-parallel light rays. The head-up display device is small in size, high in machining precision, batch in production capacity and quite high in design, machining and cost control compared with a free-form surface technology.

Inventors

ZHAO GAINA
LI RUIBIN
ZHOU DONGJIE
LUO MINGHUI
QIAO WEN

Assignees

苏州苏大维格科技集团股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (10)

1. A head-up display device, comprising: an image device configured to emit light carrying image information, and At least one diffractive optical waveguide having a transparent waveguide substrate, and a coupling-in structure and a coupling-out structure on a surface or inside of the transparent waveguide substrate; wherein the coupling-in structure is configured to receive light projected by the image device and conduct total reflection of the light within the transparent waveguide substrate; The coupling-out structure is configured to couple light conducted in the transparent waveguide substrate out of the transparent waveguide substrate, and enable the coupled light to be incident to the eye movement area approximately in parallel after being reflected by the windshield; wherein the coupled light is non-parallel light.
2. The head-up display device of claim 1, wherein the display device comprises a display device, The coupling-out structure comprises a nanodiffraction grating having preset diffraction structure parameters configured to cause the coupled-out light to be converging or diverging; Wherein the diffraction structure parameter comprises a period of the nanodiffraction grating; and when the period of the nano diffraction grating is gradually increased, the coupled light is divergent light, and the reverse extension line of the divergent light is converged to a preset depth plane.
3. The heads-up display device of claim 2 wherein the preset diffraction structure parameters include one or more of grating constant, groove width, groove depth, duty cycle, and reticle length.
4. The head-up display device according to claim 2, wherein the surface of the windshield is a curved surface, an angle is formed between a horizontal plane and a reflected light formed by the coupled light of the diffractive optical waveguide by reflection of the windshield, a distance is formed between a preset depth plane to which the coupled light of the diffractive optical waveguide or a reverse extension line of the coupled light converges and a focal plane of the windshield, and the angle is positively related to the distance.
5. The heads-up display device of claim 4 wherein the predetermined depth plane is parallel to or coincident with a focal plane of the windshield.
6. The head-up display device of claim 1, wherein light coupled out of the coupling-out structure is reflected by the windshield and incident on the eye-movement region at an angle of ±8.5° with respect to a horizontal plane.
7. The head-up display device of claim 2, wherein the display device further comprises a display unit, The head-up display device comprises a plurality of diffractive optical waveguides, wherein coupled light rays of at least two diffractive optical waveguides or opposite extension lines of the coupled light rays converge to different preset depth planes.
8. The head-up display device of claim 7, wherein the face shape of the windshield is a curved surface, and the predetermined depth plane to which the coupled-out light of the at least one diffractive optical waveguide converges coincides with the focal plane of the windshield.
9. The head-up display device of claim 8, wherein the in-coupling structures and out-coupling structures of the plurality of diffractive optical waveguides are integrally disposed on a transparent waveguide substrate.
10. The head-up display device according to any one of claims 1 to 9, wherein the image device is configured to emit light beams of different angles of view, the image device comprising: An image source; An illumination optical system configured to project illumination light to the image source; and the projection optical system is configured to collimate light rays emitted by the image source and comprises a telecentric projection lens with an external exit pupil.

Description

Head-up display device Technical Field The invention relates to the technical field of display, in particular to a head-up display device. Background Display technology is used as a man-machine interaction medium and is continuously expanded to be applied to various industries, wherein consumer electronic products, commercial displays and vehicle-mounted displays become display applications with relatively large market shares. With the continuous acceptance of electric vehicles by the public, some emerging technologies are beginning to be popularized and applied on electric vehicles, wherein the augmented reality head-up display is already used as a standard technology of the electric vehicles, with the addition of the computing power of an AI chip, the man-machine voice interaction function of the augmented reality head-up display is further powerful, more virtual road information, speed information, building information, warning and the like can be superimposed in a real space scene, and more convenience and safety are brought to a driver. However, the main technology of the current vehicle-mounted augmented reality head-up display device is a reflective free-form surface scheme, and the main clamping point of the technology is that the volume of the device is increased along with the increase of the angle of view, so that enough space is reserved in a central control area for installation, and the installation space of other components is extruded; in addition, the vehicle-mounted augmented reality head-up display device and the windshield need to be paired, and the vehicle-mounted augmented reality head-up display devices of different vehicle types need to be developed again in standing terms, so that development cost is high. Disclosure of Invention Based on this, the present invention aims to provide an improved head-up display device to solve at least one of the above problems. In a first aspect, the application provides a head-up display device comprising an image device configured to emit light carrying image information, and at least one diffractive optical waveguide having a transparent waveguide substrate and coupling-in and coupling-out structures on or within the transparent waveguide substrate; The coupling-in structure is configured to receive the light projected by the image device and make the light totally reflected and conducted in the transparent waveguide substrate, and the coupling-out structure is configured to couple the light conducted in the transparent waveguide substrate out of the transparent waveguide substrate and make the coupled light be incident to the eye movement area approximately in parallel after being reflected by the windshield; wherein the coupled light is non-parallel light. The head-up display device has at least the following advantages: 1. compared with the free-form surface scheme, the device has the advantages that the size is small, the visual field angle of the head-up display device can be increased by replacing the image device with a larger visual field, the spatial relationship among the reflectors is not needed, and the installation space of other parts in the central control area can not be extruded; 2. the diffraction optical waveguide can be manufactured by an industrial grade photoetching machine and then is stamped, so that the diffraction optical waveguide has higher processing precision, the breadth travel is not limited, the bottleneck in processing is avoided, and the diffraction optical waveguide has very high-efficiency batch production capacity; 3. For different windshields, the same image device can be adopted, and the diffraction optical waveguide is manufactured again for adaptation, so that compared with a free-form surface scheme, the method has the advantages that the whole optical system is not required to be redesigned, the universality of the image device is improved, and the method has considerable advantages in design, processing and cost control; 4. The light is coupled out by the coupling-out structure and directly reflected by the windshield, and then can be incident into the eye movement area approximately in parallel, so that eye protection display is realized, and an additional focusing device is not required to be arranged. In one embodiment, the coupling-out structure comprises a nanodiffraction grating having a preset diffraction structure parameter configured to cause the coupled-out light to be a converging light or a diverging light, wherein the diffraction structure parameter comprises a period of the nanodiffraction grating, and wherein the coupled-out light is a converging light and converges to a preset depth plane when the period of the nanodiffraction grating is gradually reduced in a direction away from the coupling-in structure, and wherein the coupled-out light is a diverging light and a reverse extension of the diverging light is converged to a preset depth plane when the period of the nanodiffraction gratin