Head-up display dust cover, head-up display and head-up display device

Abstract

The utility model relates to the technical field of head-up displays, in particular to a dust cover for a head-up display, the head-up display and a head-up display device, and the dust cover comprises a light-transmitting cover body and a dust-proof plate bonded on the light-transmitting cover body; the dustproof plate comprises a polarizing film, a first supporting film and a second supporting film are attached to the upper side and the lower side of the polarizing film respectively, a functional coating is arranged on the upper surface of the first supporting film, and the second supporting film is attached to the light-transmitting cover body. According to the dustproof cover of the head-up display, the composite structure of the light-transmitting cover body and the dustproof plate is adopted, so that the dustproof cover has certain thickness and hardness, signal partition of light is achieved through the polarizing film of the dustproof plate, dazzling white light generated by reflection during direct solar radiation is avoided, and the anti-dazzle effect is good; and meanwhile, in combination with the functional coating, the functions of scratch resistance, static resistance, infrared absorption and the like of the dust cover can be realized.

Description

Technical Field

[0001] This utility model relates to the field of head-up display technology, and in particular to a head-up display dust cover, a head-up display, and a head-up display device. Background Technology

[0002] Head-up displays (HUDs) are commonly used in aircraft flight aids and are now increasingly common in automobiles. The purpose of an automotive HUD system is to project a virtual image of the vehicle's driving information at a distance in front of the driver, allowing the driver to obtain the necessary information while looking at the road, thus avoiding traffic accidents caused by looking down at the road and improving vehicle safety.

[0003] A head-up display (HUD) mainly consists of two parts: a picture generation unit (PGU) and an optical display system. The PPU generates the HUD output image, and the optical display system displays the image. The image is emitted from the PPU and projected onto the windshield after two reflections. Therefore, when the HUD is installed on the dashboard, it usually has a relatively large opening; during use, dust in the air can easily accumulate in the HUD through this opening. To prevent dust accumulation on the reflector surface from affecting the HUD's projection light path, an optically grade transparent dust cover needs to be added to the opening. Furthermore, because a reflector is located below the dust cover, when sunlight shines directly on it, the reflected sunlight can cause severe glare, resulting in poor display quality. Utility Model Content

[0004] The purpose of this invention is to provide a dust cover for a head-up display that can avoid reflected glare and reduce glare, and to provide at least one beneficial option or create conditions to solve one or more technical problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] A head-up display dust cover includes a light-transmitting cover body and a dustproof plate adhered to the light-transmitting cover body; the dustproof plate includes a polarizing film, a first support film and a second support film are respectively attached to the upper and lower sides of the polarizing film, a functional coating is provided on the upper surface of the first support film, and the second support film is attached to the light-transmitting cover body.

[0007] More preferably, the thickness difference between the first support film and the second support film is ≤50μm.

[0008] More preferably, the light-transmitting cover is a plastic part, and the upper surface of the plastic part is a concave curved surface; the dustproof plate is glued to the curved surface of the light-transmitting cover.

[0009] More preferably, the base film of the support film is a PC film, PMMA film or TAC film, and the phase retardation value of the support film at a wavelength of 550nm is 0-100nm or ≥2000nm.

[0010] More preferably, the functional coating is one or more of the following: anti-scratch hardening layer, anti-glare layer, anti-oil and anti-fingerprint coating, antistatic coating, anti-reflective coating, waterproof coating, anti-reflective coating, anti-reflective coating, and infrared absorption layer.

[0011] More preferably, the polarizing film is bonded to the first support film and the second support film respectively by PSA adhesive, wherein the PSA adhesive is an adhesive with an infrared blocking agent.

[0012] More preferably, the thickness of the PSA adhesive is 3–30 μm, and the infrared transmittance of the PSA adhesive in the 800–1200 nm wavelength range is 15–70%, more preferably 18–50%. The transmittance in the 380–800 nm wavelength range is 60–98%, more preferably 75–98%.

[0013] More preferably, the thickness of the polarizing film is 100-300 μm, and the thickness of the dustproof plate 42 is 300-1000 μm.

[0014] On the other hand, this utility model also provides a head-up display, which includes: an image generating unit, a first reflector, a second reflector, and a dust cover arranged sequentially. The image generating unit is used to generate light carrying image information. The first reflector is used to reflect the light carrying image information to the second reflector. The second reflector is used to reflect the light carrying image information to the dust cover. The dust cover is used to prevent dust and transmit the light carrying image information. The second reflector is located below the dust cover. The dust cover is a head-up display dust cover as described above.

[0015] On the other hand, the present invention also provides a head-up display device, which includes a windshield and a head-up display as described above; the windshield is disposed in the light-emitting direction of the dust cover.

[0016] The technical solution provided by this utility model has at least the following technical effects or advantages.

[0017] I. The dust cover for a head-up display provided by this utility model adopts a composite structure of a light-transmitting cover and a dustproof plate. This not only gives the dust cover a certain thickness and hardness, but also utilizes the polarizing film of the dustproof plate to achieve light signal partitioning, avoiding the glaring white light generated by reflection when the sun is directly shining, thus achieving a good anti-glare effect. At the same time, combined with a functional coating, the dust cover for the head-up display can achieve functions such as scratch resistance, anti-static properties, and infrared absorption.

[0018] II. In the head-up display dust cover provided by this utility model, the supporting film is a thin film of PC material with a phase delay value of 0~100nm or ≥2000nm; the PC film and low delay value facilitate the implementation of a rainbow-free design for the dust cover and reduce the influence of the dust cover on the optical path.

[0019] Third, the head-up display dust cover provided by this utility model, by setting an infrared absorbing coating and adding an infrared blocking agent to the PSA adhesive, can better prevent the heating caused by infrared radiation from the sun and protect the components inside the PGU layer from damage due to high temperature.

[0020] IV. In the head-up display provided by this utility model, the first reflector is a cold light mirror, and an infrared transmission film is coated on the surface of the cold light mirror so that the cold light mirror can transmit infrared light and reflect non-infrared light. In this way, when sunlight backflow occurs, the cold light mirror can reduce the infrared light backflowing into the image generation unit, thereby better protecting the image generation unit.

[0021] The present invention provides a head-up display device that has all the beneficial effects described above. Some other beneficial effects of the present invention will become more apparent in the following description or in practice. Attached Figure Description

[0022] Figure 1 The diagram shown is a schematic diagram of the head-up display principle in this utility model.

[0023] Figure 2 The diagram shown is a structural schematic of the dust cover.

[0024] Figure 3 The diagram shown is a structural schematic of the dustproof panel.

[0025] Explanation of the reference numerals in the attached figures.

[0026] 1: Image generation unit, 2: First reflector, 3: Second reflector, 4: Dust cover, 5: Windshield, 6: Human eye.

[0027] 41: Light-transmitting cover; 42: Dustproof panel.

[0028] 421: Polarizing film, 422: First support film, 423: Second support film, 424: Functional coating, 425: PSA adhesive. Detailed Implementation

[0029] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings, making the technical solution and beneficial effects of this utility model clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0030] Additional aspects and advantages of this invention will become apparent in the following description or may be learned by practice of this invention.

[0031] Reference Figure 1 As shown, a head-up display includes: an image generating unit 1, a first reflector 2, a second reflector 3, and a dust cover 4 arranged sequentially. The image generating unit 1 is used to generate light carrying image information. The first reflector 2 is used to reflect the light carrying image information to the second reflector 3. The second reflector 3 is used to reflect the light carrying image information to the dust cover 4. The dust cover 4 is used to prevent dust and transmit the light carrying image information.

[0032] The image generation unit 1 includes a light source and a display device, which together form an LCD for emitting light carrying image information. The first reflector 2 is preferably a cold-light mirror, with an infrared transmission film coated on its surface, enabling it to transmit infrared light and reflect non-infrared light. In this way, when sunlight backflows, the cold-light mirror can reduce the amount of infrared light entering the image generation unit 1, thereby better protecting it.

[0033] Combination Figure 2 , Figure 3 As shown, the dust cover 4 includes a light-transmitting cover 41 and a dustproof plate 42 mounted on the light-transmitting cover 41. The dustproof plate 42 includes a polarizing film 421, with a first support film 422 and a second support film 423 respectively attached to the upper and lower sides of the polarizing film 421. A functional coating 424 is provided on the upper surface of the first support film 422. The support film is used to adjust the phase of the light signal incident from the dust cover 4, thereby adjusting the polarization direction and transmission. The functional coating is used to increase or enhance the function of the polarizer. In this embodiment, the thickness difference between the first support film 422 and the second support film 423 is ≤50μm, which can effectively avoid warping and deformation.

[0034] In this embodiment, the light-transmitting cover 41 is a plastic part, and the upper surface of the plastic part is a concave curved surface; the dustproof plate 42 is glued to the curved surface of the light-transmitting cover 41. Obviously, those skilled in the art can choose other known or future achievable materials for the light-transmitting cover according to different actual needs, and the shape of the light-transmitting cover can also vary according to different actual needs.

[0035] The supporting film can be made of PC (Polycarbonate), PMMA (Polymethylmethacrylate), or TAC (Triacetate cellulose). The support value of the supporting film can be determined based on the refractive index and coating of the supporting film material, and is set with the center wavelength in the visible light region of the optical signal as a reference. In this embodiment, the supporting film is preferably made of PC material, and preferably has a phase retardation value of 0~100nm or ≥2000nm at a wavelength of 550nm. The PC film and low retardation value facilitate the implementation of a rainbow-free design for the dust cover 4, reducing the optical path interference caused by the dust cover.

[0036] The functional coating 424 can be one or more of the following: anti-scratch hardening layer, anti-glare layer, anti-oil and anti-fingerprint coating, antistatic coating, anti-reflective coating, waterproof coating, anti-reflective coating, anti-reflective coating, and infrared absorption layer. Those skilled in the art can select according to different actual needs.

[0037] The polarizing film 421 is bonded to the first support film 422 and the second support film 423 respectively using PSA adhesive 425. Preferably, the PSA adhesive 425 is an adhesive with an infrared blocking agent. The thickness of the PSA adhesive is between 3 and 30 μm, and in this embodiment, it is preferably 10 μm. The infrared transmittance of the PSA adhesive in the 800–1200 nm wavelength range is 15–70%, more preferably 18–50%. In this embodiment, it is preferably 20%. The transmittance in the 380–800 nm wavelength range is 60–98%, more preferably 75–98%, and in this embodiment, it is preferably 85%.

[0038] By setting an infrared absorbing coating and adding an infrared blocking agent to the PSA adhesive, it is possible to better prevent the infrared radiation from the sun from causing the temperature to rise, thus protecting the components inside the PGU layer from damage due to high temperatures.

[0039] The thickness of the polarizing film 421 is 100~300μm, preferably 150μm. The thickness of the dustproof plate 42 is 300~1000μm, preferably 400~600μm, and in this embodiment, preferably 500μm.

[0040] In the aforementioned head-up display, the light carrying image information generated by the image generation unit 1 is reflected by the first reflector 2 and the second reflector 3 and then transmitted through the dust cover 4. It is subsequently applied to vehicles. The light carrying image information can be reflected by the windshield 5 and enter the human eye 6, where the human eye 6 can observe the image content.

[0041] Compared with existing technologies, the head-up display provided in this utility model has a dust cover with a composite structure of a light-transmitting cover and a dust cover plate. This not only gives the dust cover a certain thickness and hardness, but also utilizes the polarizing film of the dust cover plate to achieve light signal partitioning, avoiding the glaring white light generated by reflection when the sun is directly shining, and has a good anti-glare effect. At the same time, combined with a functional coating, it can achieve functions such as scratch resistance, anti-static properties, and infrared absorption.

[0042] On the other hand, this utility model also provides a head-up display device, such as a vehicle, which includes a windshield and the head-up display as described above; the windshield is positioned in the light-emitting direction of the dustproof film. The vehicle can be a car, train, or other similar vehicle.

[0043] It should also be noted that in the description of this utility model, directional terms such as "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0044] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] In this utility model, unless otherwise specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "below," and "over" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Above," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] Based on the above description of the structure and principle, those skilled in the art should understand that this utility model is not limited to the specific embodiments described above. Improvements and substitutions made using techniques known in the art based on this utility model all fall within the protection scope of this utility model, which should be defined by the claims and their equivalents. Parts not described in the specific embodiments are all prior art or common knowledge.

Claims

1. A dust cover for a head-up display, characterized in that, The device includes a light-transmitting cover and a dustproof plate adhered to the light-transmitting cover; the dustproof plate includes a polarizing film, and a first support film and a second support film are respectively attached to the upper and lower sides of the polarizing film. A functional coating is provided on the upper surface of the first support film, and the second support film is attached to the light-transmitting cover; the phase retardation values ​​of the first support film and the second support film are in the range of 0~100nm or ≥2000nm.

2. A head-up display dust cover according to claim 1, characterized in that, The thickness difference between the first support film and the second support film is ≤50μm.

3. A head-up display dust cover according to claim 1, characterized in that, The light-transmitting cover is made of plastic, and the upper surface of the plastic is a concave curved surface; the dustproof plate is glued to the curved surface of the light-transmitting cover.

4. A head-up display dust cover according to claim 1, characterized in that, The base film of the first support film and the second support film is a PC film, a PMMA film or a TAC film.

5. A head-up display dust cover according to claim 1, characterized in that, The functional coating is one or more of the following: anti-scratch hardening layer, anti-glare layer, anti-oil and anti-fingerprint coating, antistatic coating, anti-reflective coating, waterproof coating, anti-reflective coating, anti-reflective coating, and infrared absorption layer.

6. A head-up display dust cover according to claim 1, characterized in that, The polarizing film is bonded to the first support film and the second support film respectively by PSA adhesive, which is an adhesive with an infrared blocking agent.

7. A head-up display dust cover according to claim 6, characterized in that, The thickness of the PSA adhesive is between 3μm and 30μm, and the infrared transmittance of the PSA adhesive is 15-70% in the 800-1200nm wavelength range and 60-98% in the 380-800nm ​​wavelength range.

8. A head-up display dust cover according to claim 1, characterized in that, The polarizing film has a thickness of 100~300μm, and the dustproof plate has a thickness of 300~1000μm.

9. A head-up display, characterized in that, include: The assembly comprises an image generation unit, a first reflector, a second reflector, and a dust cover, arranged sequentially. The image generation unit generates light carrying image information. The first reflector reflects the light carrying image information to the second reflector, and the second reflector reflects the light carrying image information to the dust cover. The dust cover is used to prevent dust and transmit the light carrying image information. The second reflector is located below the dust cover, which is a head-up display dust cover as described in any one of claims 1-8.

10. A head-up display device, characterized in that, Includes a windshield and a head-up display as described in claim 9; the windshield is disposed in the light-emitting direction of the dust cover.

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