Vehicle-mounted optical waveguide and vehicle-mounted head-up display device

Abstract

The utility model discloses a vehicle-mounted optical waveguide and a vehicle-mounted head-up display device, the vehicle-mounted optical waveguide comprises a first glass substrate and a viscous transparent layer, the first glass substrate is bonded with one side of the transparent layer, and the first glass substrate is provided with at least one grating area. According to the utility model, the transparent layer with viscosity is adhered to the first glass substrate, so that when a traffic accident occurs, the broken first glass substrate can be adhered to the transparent layer under the action of viscosity of the transparent layer, and the first glass substrate cannot be splashed; therefore, the broken first glass substrate is prevented from damaging the HUD device, a driver and passengers, the safety of the HUD device is remarkably improved, meanwhile, the transparent layer is equivalently provided with a buffer absorption band, part of impact can be absorbed to a certain degree, the impact resistance of the whole device is higher, and the durability of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical display, in particular to a vehicle-mounted optical waveguide and a vehicle-mounted head-up display device. Background Art

[0002] Among the existing HUD (Head-Up Display) technologies, HUD devices based on optical waveguides have gradually become an important development direction of HUD due to their absolute advantage in vehicle installation volume. Optical waveguide technology mainly uses glass substrates to conduct light and realize the display of current driving speed, direction, navigation information, road conditions and other information.

[0003] However, the glass substrate in the existing HUD device is usually made of brittle material with low mechanical strength, which makes the glass substrate very easy to break and splash in the event of a traffic accident. The splashed glass substrate will not only damage the HUD device, but also cause harm to the driver and passengers. Figure 1 As shown, when the vehicle-mounted optical waveguide is impacted by a relatively large external force, it will break into multiple fragments, some of which may splash toward the driver and passengers, resulting in poor safety. Utility Model Content

[0004] The utility model aims to provide a vehicle-mounted optical waveguide and a vehicle-mounted head-up display device, aiming to solve the problems of the glass substrate in the existing HUD device being extremely easy to break and splash and having poor safety.

[0005] The utility model provides a vehicle-mounted optical waveguide, comprising: a first glass substrate and an adhesive transparent layer, wherein the first glass substrate is bonded to one side of the transparent layer, and at least one grating area is arranged on the first glass substrate.

[0006] Furthermore, it also includes: a second glass substrate, wherein the second glass substrate is bonded to the other side of the transparent layer.

[0007] Furthermore, the thickness of the second glass substrate is less than or equal to that of the first glass substrate.

[0008] Furthermore, the first glass substrate and the second glass substrate are both hardened glass.

[0009] Furthermore, the thickness of the first glass substrate and the second glass substrate are both less than or equal to 2 mm.

[0010] Furthermore, the refractive index of the first glass substrate and the second glass substrate is greater than 1.5.

[0011] Furthermore, the thickness of the transparent layer ranges from 2um to 1mm.

[0012] Furthermore, the material of the transparent layer includes: OCA double-sided tape, UV glue, thermosetting glue or PVB.

[0013] Furthermore, at least two grating regions are provided, and the at least two grating regions are located on the same surface or different surfaces of the first glass substrate, and the transparent layer is bonded to one or more surfaces of the first glass substrate.

[0014] The embodiment of the utility model further provides a vehicle-mounted head-up display device, comprising: an optical machine and the above-mentioned vehicle-mounted optical waveguide, wherein the optical machine is arranged corresponding to one of the grating areas in the vehicle-mounted optical waveguide.

[0015] The utility model discloses a vehicle-mounted optical waveguide and a vehicle-mounted head-up display device, wherein the vehicle-mounted optical waveguide comprises: a first glass substrate and a transparent layer with adhesiveness, wherein the first glass substrate is bonded to one side of the transparent layer, and at least one grating area is arranged on the first glass substrate. The utility model bonds the transparent layer with adhesiveness to the first glass substrate, so that when a traffic accident occurs, the transparent layer can adhere the broken first glass substrate thereto under the action of its own adhesiveness, so that the first glass substrate cannot splash, thereby avoiding the broken first glass substrate from causing damage to the HUD device, the driver and the passengers, and its safety is significantly improved. At the same time, the setting of the transparent layer is equivalent to providing a buffer absorption belt, which can absorb part of the impact to a certain extent, making the impact resistance of the entire device stronger and improving the durability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a vehicle-mounted optical waveguide when it is broken in the prior art;

[0018] Figure 2 is a schematic structural diagram of the vehicle-mounted optical waveguide of Example 1;

[0019] Figure 3 This is a schematic diagram of the structure of the vehicle-mounted optical waveguide of Example 1 when it is broken;

[0020] Figure 4 This is a schematic diagram of the structure of the vehicle head-up display device of Example 1 when in use;

[0021] Figure 5 is a schematic structural diagram of the vehicle-mounted optical waveguide of Example 2;

[0022] Figure 6 This is a schematic diagram of the structure of the vehicle-mounted optical waveguide of Example 2 when it is broken;

[0023] Figure 7 This is a schematic diagram of the structure of the vehicle head-up display device of Example 2 when in use;

[0024] Figure 8 It is a schematic diagram of the structure of the vehicle-mounted optical waveguide of Example 2 when it is used;

[0025] Description of the markings in the figure:

[0026] 1. First glass substrate; 2. Transparent layer; 3. Grating area; 4. Optical machine; 5. Front windshield; 6. Second glass substrate. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0029] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0030] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0031] Embodiment 1:

[0032] See also Figure 2 and Figure 3 The utility model provides a vehicle-mounted optical waveguide, comprising: a first glass substrate 1 and a transparent layer 2 with adhesiveness, wherein the first glass substrate 1 is bonded to one side of the transparent layer 2, and at least one grating area 3 is arranged on the first glass substrate 1.

[0033] In this embodiment, a transparent layer 2 with adhesiveness is bonded to the first glass substrate 1, so that when a traffic accident occurs, the transparent layer 2 can adhere the broken first glass substrate 1 thereto due to its own adhesiveness, so that the first glass substrate 1 cannot splash, thereby preventing the broken first glass substrate 1 from causing damage to the HUD device, the driver and the passengers, and its safety is significantly improved. At the same time, the setting of the transparent layer 2 is equivalent to providing a buffer absorption belt, which can absorb part of the impact to a certain extent, making the impact resistance of the entire device stronger and improving the durability of the device.

[0034] Furthermore, at least two grating regions 3 are provided, and at least two grating regions 3 can improve the quality of the overall image, and at the same time can improve the signal-to-noise ratio of the image, making the image clearer.

[0035] See also Figure 4 Its working principle is as follows: the optical machine 4 emits light containing the driving information of the car, the light is coupled into the waveguide from one of the grating areas 3, and after multiple total reflections, it touches another grating area 3, and is diffracted by another grating area 3. Then the diffracted light is emitted to the front windshield 5 of the car, and enters the human eye after reflection from the front windshield 5.

[0036] In this embodiment, at least two grating regions 3 are located on the same surface or different surfaces of the first glass substrate 1 , and the transparent layer 2 is bonded to one or more surfaces of the first glass substrate 1 .

[0037] Taking the shape of the first glass substrate 1 as a cuboid as an example, at least two grating regions 3 are located on the same surface of the first glass substrate 1 in the following manner: at least two grating regions 3 can be simultaneously arranged on the upper surface of the first glass substrate 1; or at least two grating regions 3 are simultaneously arranged on the lower surface of the first glass substrate 1;

[0038] At least two grating regions 3 are located on different surfaces of the first glass substrate 1 : at least one grating region 3 is arranged on the upper surface of the first glass substrate 1 , and at least one grating region 3 is arranged on the lower surface of the first glass substrate 1 .

[0039] In this embodiment, the transparent layer 2 may be bonded to one of the surfaces of the first glass substrate 1 in the following ways: the transparent layer 2 may be bonded to the upper surface of the first glass substrate 1 (the side close to the front windshield 5); or the transparent layer 2 may be bonded to the lower surface of the first glass substrate 1 (the side away from the front windshield 5); or the transparent layer 2 may be bonded to one of the four side surfaces of the first glass substrate 1; wherein the transparent layer 2 may be bonded to the upper surface of the first glass substrate 1 in a more convenient manner than the transparent layer 2 may be bonded to the lower surface of the first glass substrate 1 or the transparent layer 2 may be bonded to the four side surfaces of the first glass substrate 1. When the first glass substrate 1 is broken by a relatively large external force impact, if the transparent layer 2 is bonded to the upper surface of the first glass substrate 1, the fragments need to penetrate the transparent layer 2 arranged thereon before flying toward the driver or the passenger. In other words, the transparent layer 2 still has a blocking function at this time. When the transparent layer 2 is bonded to other surfaces of the first glass substrate 1, the transparent layer 2 does not have a blocking function, but only has an adhesion function, and can only adhere to the fragments bonded thereto, but cannot adhere to the fragments not bonded thereto.

[0040] In this embodiment, the transparent layer 2 is bonded to multiple surfaces of the first glass substrate 1, which can be: the transparent layer 2 is bonded to two opposite surfaces of the first glass substrate 1; or, the transparent layer 2 is bonded to two adjacent surfaces of the first glass substrate 1; or, the transparent layer 2 is bonded to three surfaces of the first glass substrate 1; or, the transparent layer 2 is bonded to four surfaces of the first glass substrate 1; or, the transparent layer 2 is bonded to five surfaces of the first glass substrate 1; or, the transparent layer 2 is bonded to six surfaces of the first glass substrate 1; wherein, the more surfaces the transparent layer 2 is bonded to, the higher the safety of the vehicle-mounted optical waveguide is.

[0041] In order to improve the safety of the vehicle-mounted optical waveguide, the mechanical strength of the first glass substrate 1 can be enhanced so that the first glass substrate 1 is not so easy to break when impacted. Specifically, the first glass substrate 1 uses hardened glass, that is, tempered glass. Tempered glass has higher mechanical strength and impact resistance, and is less likely to break than ordinary glass. In addition, even if the tempered glass breaks, it will break in small fragments instead of large sharp fragments. Small fragments are also safer than large sharp fragments. The transparent layer 2 can also better adhere the small fragments to it and prevent the small fragments from flying around.

[0042] In this embodiment, the first glass substrate 1 is made of common glass with a certain refractive index. In practical applications, the common glass refractive index range is usually between 1.3 and 1.8. However, the refractive index of some high-refractive-index glasses can reach above 2.0. In the field of augmented reality (AR) display, the refractive index of commonly used glass substrates is usually above 1.5. This is because the relationship between the refractive index of the glass substrate and the display field of view is considered. The field of view refers to the maximum angle range that a user can see when observing a display device. As the field of view requirements increase, the refractive index requirements for the material used to make the optical waveguide will also increase accordingly. Therefore, in order to meet the demand for a large field of view in the AR display field, a glass substrate with a higher refractive index is usually selected to manufacture the optical waveguide. The refractive index of the first glass substrate 1 of this embodiment is usually greater than 1.5, so that light can be effectively guided into the user's eyes, thereby achieving a wider field of view and a more realistic augmented reality experience.

[0043] In this embodiment, the refractive index of the transparent layer 2 can be greater than the refractive index of the first glass substrate 1, or less than or equal to the refractive index of the first glass substrate 1. Generally, the cost of the material increases with the increase of the refractive index. Therefore, in this embodiment, a material with a refractive index less than or equal to the refractive index of the first glass substrate 1 is generally selected to make the transparent layer 2, which can reduce the cost of the entire product.

[0044] Among them, the difference in refractive index between the first glass substrate 1 and the transparent layer 2 will cause that when the light is incident from the first glass substrate 1 to the transparent layer 2, part of the light will meet the total internal reflection condition at the interface between the first glass substrate 1 and the transparent layer 2, so that total internal reflection will occur at the interface and only propagate on the first glass substrate 1; another part of the light will not meet the total internal reflection condition at the interface between the first glass substrate 1 and the transparent layer 2, so Fresnel reflection and refraction will occur at the interface, and the image projected on the front windshield 5 may have color aberration, deformation or blurring. Therefore, if the quality of the displayed image is pursued, the refractive index of the first glass substrate 1 and the transparent layer 2 can be set to be the same, so that the scattering of light at the interface between the first glass substrate 1 and the transparent layer 2 can be reduced, thereby ensuring the quality of the displayed image.

[0045] It should be noted that the transparent layer 2 also needs to have good transmittance to avoid unnecessary interference with the original light path.

[0046] In this embodiment, the transparent layer 2 needs to have a strong adhesive force to the first glass substrate 1 to ensure that the first glass substrate 1 can be firmly adhered. Therefore, the material of the transparent layer 2 can be selected from OCA double-sided tape. The thickness of the OCA double-sided tape is usually between tens of microns and hundreds of microns, which can ensure sufficient bonding strength. At the same time, when making the OCA double-sided tape, we will try to make its refractive index close to that of the glass substrate to reduce light reflection and scattering and improve the display effect; in addition to the OCA double-sided tape, the transparent layer 2 can also be selected from other organic polymer materials, such as UV glue, thermosetting glue and PVB.

[0047] In order to pursue the lightness and thinness of the vehicle-mounted optical waveguide, the thickness of the first glass substrate 1 of this embodiment is less than or equal to 2 mm, and the thickness range of the transparent layer 2 is: 2um-1mm, so that the thickness of the entire device is kept within 3mm, which is extremely light and thin. Among them, the thickness span of the transparent layer 2 is relatively large, which depends on the specific material of the transparent layer 2 and the production requirements.

[0048] In a specific application scenario, the transparent layer 2 is made of OCA double-sided tape with a thickness of 50um, the thickness of the first glass substrate 1 is 2mm, and the thickness of the entire vehicle-mounted optical waveguide is about 2.05mm. This configuration can add an adhesive interlayer to adhere to the first glass substrate 1 while maintaining a light and thin volume as much as possible.

[0049] Embodiment 2:

[0050] See also Figure 5-7 This embodiment provides a vehicle-mounted optical waveguide, including: a first glass substrate 1 and a transparent layer 2 with adhesiveness, the first glass substrate 1 is bonded to one side of the transparent layer 2, at least two grating regions 3 are arranged on the first glass substrate 1, and also includes: a second glass substrate 6, the second glass substrate 6 is bonded to the other side of the transparent layer 2.

[0051] In this embodiment, the provision of the second glass substrate 6 can improve the clarity of the displayed image. It is difficult for the transparent layer 2 to achieve high flatness. The provision of the second glass substrate 6 can make the total reflection surface still a glass substrate, thereby ensuring the quality of total reflection, which is beneficial to maintaining the overall clarity of the image. However, compared with Example 1, one more glass substrate is provided, so the thickness of the entire vehicle-mounted optical waveguide is thicker and the cost is higher.

[0052] In this embodiment, the transparent layer 2 is bonded to one or more surfaces of the second glass substrate 6. The specific bonding method between the second glass substrate 6 and the other side of the transparent layer 2 can refer to the bonding method between the first glass substrate 1 and one side of the transparent layer 2 in Example 1, which will not be described in detail.

[0053] In this embodiment, in order to improve the safety of the vehicle-mounted optical waveguide, the mechanical strength of the first glass substrate 1 and the second glass substrate 6 can be enhanced so that the first glass substrate 1 and the second glass substrate 6 are not so easy to break when impacted. Specifically, the first glass substrate 1 and the second glass substrate 6 are both hardened glass, that is, tempered glass. Tempered glass has higher mechanical strength and impact resistance, and it is less likely to break than ordinary glass. In addition, even if the tempered glass breaks, it will break in small fragments instead of large sharp fragments. Small fragments are also safer than large sharp fragments. The transparent layer 2 can also better adhere the small fragments to it and prevent the small fragments from flying around.

[0054] In this embodiment, in order to meet the requirements of a large field of view, the refractive index of the first glass substrate 1 and the second glass substrate 6 is greater than 1.5, so that the light can be effectively guided into the user's eyes, thereby achieving a wider field of view and a more realistic augmented reality experience.

[0055] Furthermore, the second glass substrate 6 has the same shape and refractive index as the first glass substrate 1 , so that during the production process, two glass substrates can be produced simultaneously, which is beneficial to improving production efficiency and reducing production costs.

[0056] In this embodiment, the refractive index of the transparent layer 2 may be greater than the refractive index of the first glass substrate 1 and the second glass substrate 6 , or may be less than or equal to the refractive index of the first glass substrate 1 and the second glass substrate 6 .

[0057] When the refractive index of the transparent layer 2 is smaller than the refractive indexes of the first glass substrate 1 and the second glass substrate 6, and when light is coupled to the first glass substrate 1 by one of the grating regions 3 and incident on the transparent layer 2 from the first glass substrate 1, part of the light can meet the total internal reflection condition at the interface between the first glass substrate 1 and the transparent layer 2, so that total internal reflection occurs at the interface and propagates only on the first glass substrate 1; another part of the light does not meet the total internal reflection condition at the interface between the first glass substrate 1 and the transparent layer 2, and will reflect Fresnel reflection and transmission at the interface between the first glass substrate 1 and the transparent layer 2, and part of the light will penetrate the transparent layer 2 and then refract into the second glass substrate 6, so that total reflection propagation occurs at the interface between the second glass substrate 6 and the air, as shown in FIG. Figure 8 As shown in the dotted line portion, the light satisfying the total reflection condition continues to propagate through total reflection inside the first glass substrate 1, as shown in FIG. Figure 8 As shown in the solid line part, the two parts of light will finally touch another grating area 3 and be coupled out by another grating area 3.

[0058] When the refractive index of the transparent layer 2 is equal to the refractive index of the first glass substrate 1 and the second glass substrate 6, the light will not be reflected at the interface between the first glass substrate 1 and the transparent layer 2 and at the interface between the second glass substrate 6 and the transparent layer 2, and the light will directly penetrate and transmit as if the interface does not exist;

[0059] When the refractive index of the transparent layer 2 is greater than the refractive index of the first glass substrate 1 and the second glass substrate 6, Fresnel reflection and refraction will occur when the light is transmitted to the interface between the first glass substrate 1 and the transparent layer 2. A part of the light will pass through the interface and enter the transparent layer 2, and the other part of the light will be reflected back to the first glass substrate 1, and then return and transmit in the first glass substrate 1, and will be Fresnel reflected and refracted again when it encounters the interface between the first glass substrate 1 and the transparent layer 2 next time.

[0060] In order to reduce the cost of the entire product, the refractive index of the transparent layer 2 of this embodiment is less than or equal to the refractive index of the first glass substrate 1 and the second glass substrate 6, that is, the transparent layer 2 of this embodiment is made of a material with a refractive index less than or equal to the refractive index of the first glass substrate 1 and the second glass substrate 6.

[0061] In order to pursue the thinness of the vehicle-mounted optical waveguide, the thickness of the first glass substrate 1 and the second glass substrate 6 of this embodiment are both less than or equal to 2 mm, and the thickness range of the transparent layer 2 is: 2um-1mm, so that the thickness of the entire device is kept within 5mm. For a HUD device, 5mm is a sufficiently thin thickness.

[0062] Furthermore, the second glass substrate 6 mainly functions to provide a highly flat reflective surface, so the thickness requirement is relatively low. Therefore, in order to further pursue the thinness of the vehicle-mounted optical waveguide, the thickness of the second glass substrate 6 of this embodiment is less than or equal to that of the first glass substrate 1.

[0063] In the present embodiment, both grating regions 3 are SRG (surface relief grating) or volume holographic grating, which are formed on the surface of the first glass substrate 1 by photolithography or exposure. The two grating regions 3 are used as entrance pupil and exit pupil respectively. The entrance pupil is to couple the light into the interior of the glass substrate, and then the light is propagated in the interior of the glass substrate by total reflection. The total reflection needs to meet certain conditions, that is, the incident angle is greater than the critical angle. This critical angle is related to the refractive index of the glass substrate. Therefore, the aforementioned field of view angle has requirements on the refractive index of the waveguide material. The above-mentioned light that meets the total reflection conditions will reach another grating region 3 after multiple total reflections on the glass substrate. The other grating region 3 is responsible for coupling the light out of the glass substrate, which is the exit pupil. There is no difference between the entrance pupil and the exit pupil in essence, and both use the principle of grating diffraction to process the light. In addition, since grating diffraction includes both reflective diffraction and transmissive diffraction. Therefore, the grating region 3 used as the exit pupil can use either transmissive diffraction as the subsequent propagation light or reflective diffraction as the subsequent propagation light. As Figure 8 As shown, both the transmitted diffraction light and the reflected diffraction light can be used as the light for subsequent use.

[0064] The following is a detailed description of the method for making the device:

[0065] Making glass substrates: Making two glass substrates of the same shape according to specific use requirements, wherein at least two grating regions 3 need to be made on the surface of one of the glass substrates, and the thicknesses of the two glass substrates do not have to be equal, and specifically the second glass substrate 6 can be slightly thinner than the first glass substrate 1;

[0066] Glass substrate pretreatment: Clean and pretreat the prepared glass substrate to ensure that its surface is dust-free and dirt-free;

[0067] Glass substrate hardening treatment: Hardening treatment is performed on the pre-treated glass substrate. Glass hardening can be performed by heat treatment or chemical treatment. Taking heat treatment as an example, heat treatment is to heat the glass until it softens, and then quickly cool its surface, while the inside still maintains a high temperature. Due to the different cooling speeds inside and outside, compressive stress is generated on the glass surface, thereby increasing the impact resistance of the glass, improving its surface hardness and impact resistance, and then forming tempered glass;

[0068] Selection and pretreatment of transparent layer 2 materials: Select appropriate transparent layer 2 materials according to application requirements. Specifically, if you want the device to be as light and thin as possible, you can give priority to OCA double-sided tape;

[0069] The bonding of the transparent layer 2 and the hardened glass substrate: Since the sizes of the glass substrate and the transparent layer 2 are relatively small, it is difficult to operate the bonding process manually. Special equipment is required to bond the transparent layer 2 material to the hardened glass substrate. For example, if it is a glue-like material, an automatic dispensing machine is required. When bonding, it is necessary to ensure that there are no bubbles or impurities in the middle;

[0070] Curing treatment: This step is applicable to some transparent layer 2 materials that need to be cured, such as UV glue or thermosetting glue, etc., and accordingly, ultraviolet irradiation equipment and some heating equipment are required to ensure that the interlayer can be tightly bonded to the glass substrate.

[0071] This embodiment further provides a vehicle-mounted head-up display device, comprising: an optical engine 4 and the vehicle-mounted optical waveguide as described in the above embodiment, and the optical engine 4 is arranged corresponding to one of the grating areas 3 in the vehicle-mounted optical waveguide.

[0072] The light with image information output by the optical machine 4 is coupled from the corresponding grating area 3 into the vehicle-mounted optical waveguide for multiple total internal reflection propagation, then coupled out from other grating areas 3 and propagated to the front windshield 5, and then reflected by the front windshield 5 and enters the human eye.

[0073] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0074] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive.

[0075] Inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A vehicle-mounted optical waveguide, It is characterized in that include: A first glass substrate and an adhesive transparent layer, wherein the first glass substrate is bonded to one side of the transparent layer, and at least one grating area is disposed on the first glass substrate; At least two grating regions are provided, and the at least two grating regions are located on the same surface or different surfaces of the first glass substrate, and the transparent layer is bonded to one or more surfaces of the first glass substrate.

2. The vehicle-mounted optical waveguide according to claim 1, It is characterized in that Also includes: A second glass substrate is bonded to the other side of the transparent layer.

3. The vehicle-mounted optical waveguide according to claim 2, It is characterized in that The thickness of the second glass substrate is less than or equal to the thickness of the first glass substrate.

4. The vehicle-mounted optical waveguide according to claim 2, It is characterized in that The first glass substrate and the second glass substrate are both hardened glass.

5. The vehicle-mounted optical waveguide according to claim 2, It is characterized in that The thickness of the first glass substrate and the second glass substrate are both less than or equal to 2 mm.

6. The vehicle-mounted optical waveguide according to claim 2, It is characterized in that The refractive index of the first glass substrate and the second glass substrate is greater than 1.

5.

7. The vehicle-mounted optical waveguide according to claim 1, It is characterized in that The thickness of the transparent layer ranges from 2um to 1mm.

8. The vehicle-mounted optical waveguide according to claim 1, It is characterized in that The material of the transparent layer includes: OCA double-sided tape, UV glue, thermosetting glue or PVB.

9. A vehicle-mounted head-up display device, It is characterized in that include: An optical machine and a vehicle-mounted optical waveguide as described in any one of claims 1 to 8, wherein the optical machine is arranged corresponding to one of the grating areas in the vehicle-mounted optical waveguide.

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