Fresnel HUD screen

Abstract

The invention discloses a Fresnel HUD screen, and relates to the technical field of head-up display equipment, the Fresnel HUD screen comprises a substrate, a Fresnel structure layer and a microstructure layer, the Fresnel structure layer is arranged on the top of the substrate, the microstructure layer is arranged on the reflection surface of the Fresnel structure, and the Fresnel structure layer is arranged on the top of the substrate. The microstructure layer sequentially comprises a micro-nano lens layer, an optical coating, a crystal layer, a light reflecting layer, a light absorbing layer, an isolating layer, a microcrystalline structure layer and a base material layer from top to bottom; according to the invention, a screen with a Fresnel structure is adopted and is matched with a short-focus micro projector, so that low-projection-ratio and high-gain (high-brightness) imaging can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of head-up display equipment, and in particular to a Fresnel HUD screen. Background Art

[0002] Head-up display devices are often used in vehicles such as cars and airplanes to display the current operating status of the vehicle. However, since the head-up display device needs to be installed in a small space such as the dashboard, the size of the entire head-up display device must be reduced, but the image must be as large as possible.

[0003] In summary, achieving low projection ratio and high gain (high brightness) imaging of head-up display devices is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] The purpose of the present invention is to provide a Fresnel HUD screen to solve the problems existing in the above-mentioned prior art and to achieve low projection ratio and high gain (high brightness) imaging.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a Fresnel HUD screen, comprising a substrate, a Fresnel structure layer and a microstructure layer, wherein the Fresnel structure layer is arranged on the top of the substrate, the microstructure layer is arranged on the reflection surface of the Fresnel structure layer, and the microstructure layer comprises a crystal layer, a reflective layer and a microcrystalline structure layer in sequence from top to bottom.

[0007] Preferably, the material of the Fresnel structure layer is epoxy resin, which is integrally formed by a mold and fixed by light curing.

[0008] Preferably, the Fresnel structure layer is composed of a plurality of micro-serrated structures, two inclined surfaces of the micro-serrated structures are a reflection surface and a cutting surface respectively, and the angle between the reflection surface and the cutting surface is 15°-160°.

[0009] Preferably, the microcrystalline structure layer is arranged on the reflective surface of the Fresnel structure layer and is formed with the Fresnel structure layer by mold embossing, transfer or injection molding. The top of the microcrystalline structure layer is composed of continuously undulating arc surfaces, and the chord height ratio of a single arc surface is 10:1 to 50:1.

[0010] Preferably, it also includes an isolation layer, which is arranged on the top of the microcrystalline structure layer and is in a continuous undulating shape. The material of the isolation layer is phosphorus pentoxide, chromium oxide or silicon oxide, and the isolation layer is arranged on the microcrystalline structure layer by magnetron sputtering technology.

[0011] Preferably, it also includes a light absorbing layer, which is arranged on the top of the isolation layer and is in a continuous undulating shape. The light absorbing layer is a layer of dark color attachment material or chromium alloy formed on the surface of the isolation layer by deposition or electroplating.

[0012] Preferably, the reflective layer is arranged on the light absorbing layer and is in a continuous undulating shape. The reflective layer is a layer of reflective metal formed on the surface of the light absorbing layer by printing, spraying, deposition, vacuum evaporation or electroplating and adsorbed on the light absorbing layer.

[0013] Preferably, the crystal layer is arranged on the top of the reflective layer, the crystal layer is SIO2 crystal or titanium oxide crystal or AL2O3 crystal, the crystal layer is a transparent nano film layer formed on the surface of the reflective layer by deposition, vacuum evaporation or electroplating, and is composed of at least one layer of transparent nano film layer.

[0014] Preferably, it also includes an optical coating, which is arranged on the top of the crystal layer, and a layer of optical coating attached to the crystal layer is formed on the surface of the crystal layer by coating or spraying.

[0015] Preferably, it further comprises a micro-nano lens layer, which is arranged on the top of the optical coating, and a layer of micro-nano lens layer adhered to the optical coating is formed on the surface of the optical coating by coating or spraying.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The Fresnel HUD screen in the present invention is a screen with a Fresnel structure, which can achieve low projection ratio imaging in conjunction with a short-throw micro-projector;

[0018] Furthermore, a microstructure layer is arranged on the reflection surface of the Fresnel structure layer, and the image is projected onto the imaging medium layer by providing a diffuse reflection effect through the microstructure layer. The brightness (gain) of the imaging is adjusted by changing the chord height ratio of the scattering spherical cap. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 Schematic diagram of the three-dimensional structure of the Fresnel HUD screen in the present invention;

[0021] Figure 2It is a partial enlarged view of the Fresnel structure layer in the present invention;

[0022] Figure 3 It is a partial enlarged view of the microstructure layer in the present invention;

[0023] Figure 4 It is a working principle diagram of the present invention;

[0024] In the figure: 1, substrate; 2, Fresnel structure layer; 3, microstructure layer; 4, micro-nano lens layer; 5, optical coating; 6, crystal layer; 7, reflective layer; 8, light-absorbing layer; 9, isolation layer; 10, microcrystalline structure layer; 11, reflecting surface; 12, cut surface. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The purpose of the present invention is to provide a Fresnel HUD screen to solve the problems existing in the prior art.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] The Fresnel HUD screen in this embodiment is as follows: Figure 1-Figure 3 As shown, it includes a substrate 1, a Fresnel structure layer 2 and a microstructure layer 3. The Fresnel structure layer 2 is arranged on the top of the substrate 1, and the microstructure layer 3 is arranged on the reflection surface 11 of the Fresnel structure layer 2. The microstructure layer 3 includes a crystal layer 6, a reflective layer 7 and a microcrystalline structure layer 10 from top to bottom.

[0029] In this specific embodiment, the material of the Fresnel structure layer 2 is epoxy resin, which is integrally formed by a mold and fixed by light curing. The Fresnel structure layer 2 is composed of a plurality of micro-serrated structures. The two inclined surfaces of the micro-serrated structures are the reflecting surface 11 and the cutting surface 12. The angle between the reflecting surface 11 and the cutting surface 12 is 15°-160°, which depends on the magnification of the Fresnel lens. The closer to the center, the smaller the angle.

[0030] In this specific embodiment, the microcrystalline structure layer 10 is arranged on the reflective surface of the Fresnel structure layer 2 and is formed with the Fresnel structure layer 2 by mold embossing, transfer or injection molding. The top of the microcrystalline structure layer 10 is composed of a continuously undulating arc surface, and the chord-to-height ratio (chord length to chord height) of a single arc surface is 10:1 to 50:1.

[0031] In this specific embodiment, an isolation layer 9 is also included. The isolation layer 9 is arranged on the top of the microcrystalline structure layer 10 and is in a continuous undulating shape. The material of the isolation layer 9 is phosphorus pentoxide, chromium oxide or silicon oxide. The isolation layer 9 is arranged on the microcrystalline structure layer 10 using magnetron sputtering technology, and it plays a role in protecting the microcrystalline structure layer 10.

[0032] In this specific embodiment, a light absorbing layer 8 is also included. The light absorbing layer 8 is arranged on the top of the isolation layer 9 and is in a continuous undulating shape. The light absorbing layer 8 is a layer of dark-colored attachment material or chromium alloy formed on the surface of the isolation layer 9 by deposition or electroplating. The light absorbing layer 8 absorbs light passing through the reflective layer to avoid multiple reflections and improve the polarization contrast and contrast.

[0033] In this specific embodiment, the reflective layer 7 is arranged on the light absorbing layer 8 and is in a continuous undulating shape. The reflective layer 7 is a layer of reflective metal formed on the surface of the light absorbing layer 8 by printing, spraying, deposition, vacuum evaporation or electroplating and adsorbed on the light absorbing layer 8; the reflective layer is generally electroplated aluminum, silver, or nickel.

[0034] In this specific embodiment, a crystal layer 6 is also included. The crystal layer 6 is arranged on the top of the reflective layer 7. The crystal layer 6 is SIO2 crystal or titanium oxide crystal or AL2O3 crystal. The crystal layer 6 is a transparent nanofilm layer formed on the surface of the reflective layer 7 by deposition, vacuum evaporation or electroplating, and is composed of at least one layer of transparent nanofilm layer; the crystal layer 6 can also be called a premium layer, which protects the reflective layer, isolates air and water vapor, and prevents oxidation and scratching of the metal layer.

[0035] In this specific embodiment, an optical coating 5 is also included. The optical coating 5 is arranged on the top of the crystal layer 6. A layer of optical coating 5 is formed on the surface of the crystal layer 6 by coating or spraying. The optical coating 5 is adhered to the crystal layer 6. The optical coating 5 plays an enhanced protective role and is resistant to friction.

[0036] In this specific embodiment, a micro-nano lens layer 4 is also included. The micro-nano lens layer 4 is arranged on the top of the optical coating 5. A layer of micro-nano lens layer 4 attached to the optical coating 5 is formed on the surface of the optical coating 5 by coating or spraying; it is oil-proof and waterproof; and the refraction angle is increased to increase the viewing angle.

[0037] The working principle of the present invention is as follows:

[0038] A microstructure layer is arranged on the reflection surface of the Fresnel structure layer, and a diffuse reflection effect is provided by the microstructure layer. The image imaging medium layer is projected, and the brightness (gain) of the imaging is adjusted by changing the chord height ratio of the scattering spherical cap (the top arc surface of the microcrystalline structure layer 10), such as Figure 4As shown in the figure, the larger the height-to-black ratio (the larger the radius of curvature of the arc), the smaller the scattering angle, the more concentrated the reflected light, the higher the gain, and the higher the brightness. On the contrary, the smaller the height-to-black ratio (the smaller the radius of curvature of the arc), the reflected light is quite dispersed, the gain is lower, and the brightness is low.

[0039] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A Fresnel HUD screen, characterized in that: The invention comprises a substrate, a Fresnel structure layer and a microstructure layer, wherein the Fresnel structure layer is arranged on the top of the substrate, the microstructure layer is arranged on the reflection surface of the Fresnel structure layer, and the microstructure layer comprises a crystal layer, a reflective layer and a microcrystalline structure layer in order from top to bottom.

2. The Fresnel HUD screen according to claim 1, characterized in that: The Fresnel structure layer material is epoxy resin, which is integrally formed by a mold and fixed by light curing.

3. The Fresnel HUD screen according to claim 1, characterized in that: The Fresnel structure layer is composed of a plurality of micro-serrated structures, wherein two inclined surfaces of the micro-serrated structures are a reflection surface and a cutting surface respectively, and the angle between the reflection surface and the cutting surface is 45°-160°.

4. The Fresnel HUD screen according to claim 1, characterized in that: The microcrystalline structure layer is arranged on the reflection surface of the Fresnel structure layer and is formed with the Fresnel structure layer by mold embossing, transfer printing or injection molding. The top of the microcrystalline structure layer is composed of a continuously undulating arc surface, and the chord height ratio of a single arc surface is 10:1 to 50:

1.

5. The Fresnel HUD screen according to claim 4, characterized in that: It also includes an isolation layer, which is arranged on the top of the microcrystalline structure layer and is in a continuous undulating shape. The material of the isolation layer is phosphorus pentoxide, chromium oxide or silicon oxide. The isolation layer is arranged on the microcrystalline structure layer by using magnetron sputtering technology.

6. The Fresnel HUD screen according to claim 5, characterized in that: It also includes a light absorbing layer, which is arranged on the top of the isolation layer and is in a continuous undulating shape. The light absorbing layer is a layer of dark color attachment material or chromium alloy formed on the surface of the isolation layer by deposition or electroplating.

7. The Fresnel HUD screen according to claim 6, characterized in that: The reflective layer is arranged on the light absorbing layer and is in a continuous undulating shape. The reflective layer is a layer of reflective metal formed on the surface of the light absorbing layer by printing, spraying, deposition, vacuum evaporation or electroplating and adsorbed on the light absorbing layer.

8. The Fresnel HUD screen according to claim 7, characterized in that: The crystal layer is arranged on the top of the reflective layer. The crystal layer is SIO2 crystal or titanium oxide crystal or Al2O3 crystal. The crystal layer is a transparent nano film layer formed on the surface of the reflective layer by deposition, vacuum evaporation or electroplating, and is composed of at least one transparent nano film layer.

9. The Fresnel HUD screen according to claim 8, characterized in that: It also includes an optical coating, which is arranged on the top of the crystal layer. A layer of optical coating attached to the crystal layer is formed on the surface of the crystal layer by coating or spraying.

10. The Fresnel HUD screen according to claim 9, characterized in that: It also includes a micro-nano lens layer, which is arranged on the top of the optical coating. A layer of micro-nano lens layer attached to the optical coating is formed on the surface of the optical coating by coating or spraying.

Images