Projection type head-up display

Abstract

The utility model belongs to a projection type head-up display in the technical field of vehicle displays. A glass substrate (1), a dielectric layer (2), a metal layer (3) and a top dielectric layer (4) are sequentially arranged from one side to the other side, the glass substrate (1) is located on the innermost side, the top dielectric layer (4) is located on the outermost side, and the optical incident angle beta (5) of the top dielectric layer (4) is within the range of 65 degrees + / -25 degrees. The projection type head-up display is simple in structure, small in film layer number and small in film thickness, effectively reduces production cost, reliably achieves the purpose of P light reflection, and improves display definition and stability due to the fact that S light average reflectivity is smaller than P light average reflectivity.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle display technology, and more specifically, relates to a projection head-up display. Background Technology

[0002] PHUD (Projected Head-Up Display) is a projection-type head-up display that projects vehicle information, navigation information, etc., directly into the driver's field of vision. PHUDs reduce errors caused by optical reflections and improve display clarity and stability by creating a black area at the bottom of the windshield and projecting information onto this specific area. With the development of automotive intelligence and networking, the market attention on PHUD technology is constantly increasing. The drawback of existing technologies is that, with the increasing market attention on PHUDs, the demand for P-light reflective films in its components is growing. P-light reflective films require a certain standard of P-light reflectivity, while S-light reflectivity is lower than P-light reflectivity, and the lower the better. Existing P-light reflective films achieve the effect of P-light reflection by coating a high-reflectivity coating or mirror silver plating, followed by a grating structure fabrication process, resulting in a long manufacturing cycle and high cost. This invention designs a set of film layers and uses magnetron sputtering to deposit multiple layers of dielectric and metal films on the substrate surface to achieve a certain level of P-light reflection and low S-light reflection, eliminating the need for grating processing, resulting in high efficiency and low cost.

[0003] Prior art includes a technology entitled "Compact Head-Up Display and Waveguide Thereof," with publication number CN116300081B, which discloses a waveguide arranged as a pupil expander for a display system. The waveguide includes a pair of opposing surfaces configured to guide a light field between them via internal reflection. An input port is arranged to receive light from the display system. A reflective element is arranged to internally reflect the light field. The input port and the reflective element are formed on a second surface of the pair of opposing surfaces. An output port is formed on a first surface of the pair of opposing surfaces by a transmission-reflection element configured to divide the light field each time it is reflected from its interior, such that multiple copies of the light field are transmitted out of the waveguide through the output port. The reflective element includes a metal layer disposed on the second surface of the waveguide and a dielectric stack at least partially disposed on the metal layer to form a step. The metal layer forms an edge with the input port, and the dielectric stack is offset relative to the edge in a direction away from the input port. However, this technology does not address the technical problems and solutions of this application. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a projection head-up display that has a simple structure, fewer film layers and thinner film thickness, thereby effectively reducing production costs, reliably achieving the purpose of P-light reflection, and having an average S-light reflectivity that is less than the average P-light reflectivity, thus improving display clarity and stability.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] This utility model is a projection head-up display, which consists of a glass substrate, a dielectric layer, a metal layer, and a top dielectric layer from one side to the other. The glass substrate is located on the innermost side, and the top dielectric layer is located on the outermost side. The optical incident angle β of the top dielectric layer is in the range of 65°±25°.

[0007] The glass substrate is optical grade glass, optical grade PMMA, or optical grade PC.

[0008] The dielectric layer is made of highly transparent silicon oxide, aluminum oxide, niobium oxide, or titanium oxide.

[0009] The metal layer is silver, aluminum, or chromium.

[0010] The top dielectric layer is made of highly transparent silicon dioxide, aluminum oxide, niobium oxide, or titanium oxide.

[0011] The number of stacked dielectric layers is 1 to 15, and the thickness of dielectric layer 2 is 30 nm to 500 nm.

[0012] The thickness of the glass substrate is 200μm to 2000μm.

[0013] The number of stacked metal layers is 1 to 5, and the thickness of the metal layer is 2 nm to 500 nm.

[0014] The number of stacked layers of the top dielectric layer is 1 to 5, and the thickness of the top dielectric layer is 30 nm to 500 nm.

[0015] The working principle and beneficial effects of this utility model are as follows:

[0016] The projection-type head-up display (HUD) of this invention comprises a glass substrate and a film layer. The film layer is arranged sequentially from the inside out, consisting of a dielectric layer, a metal layer, and a top dielectric layer. The optical incident angle β of the top dielectric layer is controlled within the range of 65°±25°. The film layer is formed by magnetron sputtering on the surface of the glass substrate. The dielectric layer, metal layer, and top dielectric layer are deposited sequentially. The film layer processing technology is simple, and after processing, reliable P-light reflection and low S-light reflection can be achieved. No grating processing is required, resulting in high efficiency and low cost. Thus, at a specific incident angle β, based on the glass substrate structure, an average P-light reflectivity ≥22% and an average S-light reflectivity ≤13% can be achieved. This meets the optical requirements of the P-light reflective film for PHUD components and achieves the goal of improving the PHUD effect. Attached Figure Description

[0017] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings therein:

[0018] Figure 1 This is a cross-sectional view of the projection head-up display described in this utility model.

[0019] Figure 2 This is a schematic diagram of the projection-type head-up display described in this utility model;

[0020] The labels in the attached figure are as follows: 1, glass substrate; 2, dielectric layer; 3, metal layer; 4, top dielectric layer; 5, optical incident angle β. Detailed Implementation

[0021] The following description, with reference to the accompanying drawings, provides a more detailed explanation of the specific embodiments of this utility model, including the shape and structure of each component, the relative positions and connections between the parts, the functions and working principles of each part:

[0022] As attached Figure 1 Appendix Figure 2 As shown, this utility model is a projection-type head-up display. From one side to the other, it consists of a glass substrate 1, a dielectric layer 2, a metal layer 3, and a top dielectric layer 4. The glass substrate 1 is located on the innermost side, and the top dielectric layer 4 is located on the outermost side. The optical incident angle β5 of the top dielectric layer 4 is in the range of 65°±25°. To address the shortcomings of existing technologies, an improved technical solution is proposed. In this structural configuration, the display includes a glass substrate, film layers, and an incident angle. The film layers are arranged from the inside out as follows: dielectric layer, metal layer, and top dielectric layer. The structure is shown in the attached diagram. Figure 1The optical incident angle β5 of the top dielectric layer 4 is controlled within the range of 65°±25°. The film layer is formed on the surface of the glass substrate 1 using magnetron sputtering. The dielectric layer 2, metal layer 3, and top dielectric layer 4 are deposited sequentially. The film layer processing technology is simple, and after processing, reliable P-light reflection and low S-light reflection can be achieved. No grating processing is required, resulting in high efficiency and low cost. At the β incident angle, based on the structure of the glass substrate 1, an optical effect with an average P-light reflectivity ≥22% and an average S-light reflectivity ≤13% can be achieved (see Appendix). Figure 2 The P-light reflective film design of this invention can meet the optical requirements of the P-light reflective film for PHUD components, thereby improving the PHUD's performance. The projection-type head-up display described in this invention has a simple structure, fewer film layers, and a thinner film thickness, effectively reducing production costs. It reliably achieves P-light reflection, and the average S-light reflectivity is lower than the average P-light reflectivity, improving display clarity and stability.

[0023] The glass substrate 1 is optical-grade glass or optical-grade PMMA, i.e., Poly(methicone) or optical-grade PC, referring to polycarbonate materials with high light transmittance. The thickness of the glass substrate 1 is 200 μm to 2000 μm. The above structure limits the material and thickness of the glass substrate to meet the requirements for forming a specific projection-type head-up display.

[0024] The dielectric layer 2 is made of highly transparent silicon oxide, aluminum oxide, niobium oxide, or titanium oxide. The dielectric layer 2 has 1 to 15 stacked layers and a thickness of 30 nm to 500 nm. This structure limits the material, number of stacked layers, and thickness of the dielectric layer to meet the requirements for forming a specific projection-type head-up display.

[0025] The metal layer 3 is made of silver, aluminum, or chromium. The number of stacked metal layers 3 is 1 to 5, and the thickness of metal layer 3 is 2 nm to 500 nm. The above structure limits the material, number of stacked layers, and thickness of the metal layer to meet the requirements for forming a specific projection-type head-up display.

[0026] The top dielectric layer 4 is made of highly transparent silicon oxide, aluminum oxide, niobium oxide, or titanium oxide. The number of stacked layers of the top dielectric layer 4 is 1 to 5, and the thickness of the top dielectric layer 4 is 30 nm to 500 nm. The above structure limits the material, number of stacked layers, and thickness of the top dielectric layer 4 to meet the requirements for forming a specific projection-type head-up display.

[0027] The projection-type head-up display of this utility model includes a glass substrate and a film layer. The film layer is arranged from the inside out as follows: a dielectric layer, a metal layer, and a top dielectric layer. The structure is shown in the attached figure. Figure 1 The optical incident angle β5 of the top dielectric layer 4 is controlled within the range of 65°±25°. The film is formed on the surface of the glass substrate 1 using magnetron sputtering. The dielectric layer 2, metal layer 3, and top dielectric layer 4 are deposited sequentially. The film processing technology is simple, and after processing, reliable P-light reflection and low S-light reflection can be achieved. No grating processing is required, resulting in high efficiency and low cost. Thus, at the β incident angle, based on the structure of the glass substrate 1, an optical effect with an average P-light reflectivity ≥22% and an average S-light reflectivity ≤13% can be achieved (see Appendix). Figure 2 The P-light reflective film design of this invention can meet the optical requirements of the P-light reflective film for PHUD components, thereby improving the effect of PHUD.

[0028] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A projection-type head-up display, characterized in that: From one side to the other, the layers are glass substrate (1), dielectric layer (2), metal layer (3), and top dielectric layer (4). The glass substrate (1) is located on the innermost side, and the top dielectric layer (4) is located on the outermost side. The optical incident angle β (5) of the top dielectric layer (4) is in the range of 65°±25°.

2. The projection-type head-up display according to claim 1, characterized in that: The glass substrate (1) is optical grade glass, optical grade PMMA, or optical grade PC.

3. The projection head-up display according to claim 1 or 2, characterized in that: The dielectric layer (2) is silicon oxide, aluminum oxide, niobium oxide, or titanium oxide.

4. The projection-type head-up display according to claim 3, characterized in that: The metal layer (3) is silver, aluminum, or chromium.

5. The projection head-up display according to claim 1 or 2, characterized in that: The top dielectric layer (4) is silicon oxide, aluminum oxide, niobium oxide, or titanium oxide.

6. The projection-type head-up display according to claim 3, characterized in that: The dielectric layer (2) has 1 to 15 stacked layers and a thickness of 30 nm to 500 nm.

7. The projection-type head-up display according to claim 2, characterized in that: The thickness of the glass substrate (1) is 200μm to 2000μm.

8. The projection head-up display according to claim 4, characterized in that: The number of stacked layers of the metal layer (3) is 1 to 5, and the thickness of the metal layer (3) is 2 nm to 500 nm.

9. The projection-type head-up display according to claim 5, characterized in that: The number of stacked layers of the top dielectric layer (4) is 1 to 5, and the thickness of the top dielectric layer (4) is 30 nm to 500 nm.

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