Image source, head-up display and vehicle

Abstract

The embodiment of the utility model provides an image source, a head-up display and a vehicle, the image source comprises a backlight assembly and an image generation assembly, the backlight assembly comprises a light emitting part and a light control part, the light control part is arranged on the light emitting side of the light emitting part, the image generation assembly is arranged on the light emitting side of the light control part, and the light control part comprises a Fresnel direction control structure, the main optical axis direction of the light is adjusted in two directions; the lens diffusion structure is used for adjusting the divergence angle of light in two directions. According to the image source, the brightness of the image source is ensured, the imaging light can be stably focused to the center of the eye box, and the display effect is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of optical imaging equipment, and in particular to an image source, a head-up display, and a vehicle. Background Art

[0002] A head up display (HUD), also known as a head-up display, generally includes an image source and an amplifying optical path. The image source is used to project imaging light into the amplifying optical path, and then transmit it to an imaging plate or the windshield of a vehicle for display, so that the user can directly see the picture without lowering his head. In the prior art, it is necessary to ensure that the brightness of the virtual image seen by the user is high to ensure the display effect, which requires the image source to output a high brightness, thus resulting in high heat generation. The diffuser used in the existing image source diffuses and evens out the light through the pattern to form a circular light spot, which has poor light controllability and low evenness efficiency. The light spot needs to be large to cover the entire eye box, resulting in a large portion of the light spot being located outside the eye box, resulting in low imaging brightness and energy waste. Utility Model Content

[0003] The purpose of the embodiments of the present disclosure is to provide an image source, a head-up display, and a vehicle, which achieve better display effects.

[0004] In order to solve the above technical problems, the embodiments of the present disclosure adopt the following technical solutions: an image source is provided, including a backlight assembly and an image generating assembly, the backlight assembly includes a light emitting part and a light controlling part, the light controlling part is arranged on the light emitting side of the light emitting part, and the image generating assembly is arranged on the light emitting side of the light controlling part, the light controlling part includes: a Fresnel direction control structure to adjust the main optical axis direction of the light in two directions; a lens diffusion structure to adjust the divergence angle of the light in two directions.

[0005] In an exemplary embodiment, the lens diffusion structure includes a concave-convex lens array, or the lens diffusion structure includes a first cylindrical lens array and a second cylindrical lens array, the cylindrical lenses in the first cylindrical lens array extend in a first direction of the two directions, and the cylindrical lenses in the second cylindrical lens array extend in a second direction of the two directions.

[0006] In an exemplary embodiment, the lens diffusion structure is arranged on one or more surfaces. When the lens diffusion structure is arranged on one surface, the lens diffusion structure is a concave-convex lens array, and the concave-convex lens array has convex surfaces and concave surfaces alternately arranged in two directions; or, when the lens diffusion structure is arranged on multiple surfaces, the lens diffusion structure includes a first column lens array and a second column lens array, and the first column lens array and the second column lens array are respectively arranged on different surfaces, the first column lens array includes multiple first column lenses, and the second column lens array includes multiple second column lenses, and the extension direction of the first column lens is perpendicular to the extension direction of the second column lens.

[0007] In an exemplary embodiment, the first cylindrical lens is a convex lens or a concave lens; and / or the second cylindrical lens is a convex lens or a concave lens.

[0008] In an exemplary embodiment, the light control unit further includes a substrate, and the first cylindrical lens array and the second cylindrical lens array are respectively arranged on both side surfaces of a substrate; or, the first cylindrical lens array and the second cylindrical lens array are respectively arranged on two substrates.

[0009] In an exemplary embodiment, the Fresnel direction control structure is arranged on one or more surfaces. When the Fresnel direction control structure is arranged on one surface, the Fresnel direction control structure is a free-form surface Fresnel. When the Fresnel direction control structure is arranged on multiple surfaces, the Fresnel direction control structure includes at least two of a circular Fresnel, a first linear Fresnel, and a second linear Fresnel. The first linear Fresnel includes a plurality of first tooth structures, and the second linear Fresnel includes a plurality of second tooth structures. The extension direction of the first tooth structure is perpendicular to the extension direction of the second tooth structure.

[0010] In an exemplary embodiment, the light control portion further includes a substrate, and one of the circular Fresnel, the first linear Fresnel, and the second linear Fresnel is arranged on a side surface of one substrate, and the other of the circular Fresnel, the first linear Fresnel, and the second linear Fresnel is arranged on the other side surface of the substrate; or, one of the circular Fresnel, the first linear Fresnel, and the second linear Fresnel is arranged on one substrate, and the other of the circular Fresnel, the first linear Fresnel, and the second linear Fresnel is arranged on another substrate.

[0011] In an exemplary embodiment, the light control unit further includes a substrate, and there are one or more substrates. When there is only one substrate, the concave-convex lens array and the free-form surface Fresnel are respectively arranged on both side surfaces of the substrate.

[0012] In an exemplary embodiment, the light control part also includes a first substrate and a second substrate, the second substrate is located on the side of the first substrate away from the light output part, the Fresnel direction control structure includes a first linear Fresnel and a second linear Fresnel, the lens diffusion structure includes a first column lens array and a second column lens array, the first linear Fresnel and the second linear Fresnel are respectively arranged on both side surfaces of the first substrate, and the first column lens array and the second column lens array are respectively arranged on both side surfaces of the second substrate.

[0013] In an exemplary embodiment, the light control portion further includes a first substrate and a second substrate, the second substrate is located on a side of the first substrate away from the light exit portion, one of the circular Fresnel, the first linear Fresnel, and the second linear Fresnel is arranged on the light incident surface of the first substrate, and the other of the circular Fresnel, the first linear Fresnel, and the second linear Fresnel is arranged on the light incident surface of the second substrate; one of the first cylindrical lens array and the second cylindrical lens array is arranged on the light exit surface of the first substrate, and the other of the first cylindrical lens array and the second cylindrical lens array is arranged on the light exit surface of the first substrate.

[0014] In an exemplary embodiment, the light control part also includes a first substrate and a second substrate, the lens diffusion structure includes a concave-convex lens array, the Fresnel direction control structure includes a first linear Fresnel and a second linear Fresnel, the concave-convex lens array is arranged on a side surface of the first substrate, and the first linear Fresnel is arranged on one of the other side surface of the first substrate, the one side surface of the second substrate and the other side surface of the second substrate; the second linear Fresnel is arranged on the other side surface of the first substrate, the one side surface of the second substrate and the other side surface of the second substrate.

[0015] In an exemplary embodiment, the lens diffusion structure includes a plurality of lenses, the Fresnel direction control structure includes a plurality of tooth structures, the width of each lens is less than or equal to 300 microns, and the height of each lens is less than or equal to 30 microns; and / or, the width of each tooth structure is less than or equal to 300 microns, and the height of each tooth structure is less than or equal to 150 microns.

[0016] An embodiment of the present disclosure also provides an image source, including a backlight assembly and an image generating assembly. The backlight assembly includes a light emitting portion and a light controlling portion. The light controlling portion is arranged on the light emitting side of the light emitting portion, and the image generating assembly is arranged on the light emitting side of the light controlling portion. The light controlling portion includes: a Fresnel direction control structure to adjust the main optical axis direction of the light in one direction; and a lens diffusion structure to adjust the divergence angle of the light in one direction.

[0017] In an exemplary embodiment, the lens diffusion structure includes a cylindrical lens array; and the Fresnel direction control structure is a linear Fresnel.

[0018] In an exemplary embodiment, the lens diffusion structure includes a plurality of lenses, the Fresnel direction control structure includes a plurality of tooth structures, the width of each lens is less than or equal to 300 microns, and the height of each lens is less than or equal to 30 microns; and / or, the width of each tooth structure is less than or equal to 300 microns, and the height of each tooth structure is less than or equal to 150 microns.

[0019] The embodiment of the present disclosure further provides a head-up display, comprising the image source as claimed above.

[0020] The embodiments of the present disclosure further provide a vehicle, comprising the above-mentioned image source, or comprising the above-mentioned head-up display.

[0021] The image source, head-up display, and vehicle provided by the embodiments of the present disclosure utilize a Fresnel direction control structure to control the direction of light emission, thereby adjusting the principal optical axis of the light in two directions. The Fresnel direction control structure focuses the light to the center of the eyebox, and the lens diffusion structure diffuses the light, thereby adjusting the divergence angle of the light in two directions. This allows the light to cover the entire eyebox, thereby increasing image brightness and ensuring display quality. The combination of the Fresnel direction control structure and the lens diffusion structure achieves two-dimensional direction control and two-dimensional diffusion of the light. This facilitates ensuring that, after the light undergoes principal optical axis adjustment by the Fresnel direction control structure and diffusion by the lens diffusion structure, the principal optical axis of the light beam emitted by each pixel of the image generation component matches the designed direction after passing through the image generation component. Furthermore, the light spot corresponding to the light beam emitted by each pixel can match or be slightly larger than the eyebox. This ensures that the light beams of pixels at different locations cover the entire eyebox while minimizing light that irradiates outside the eyebox, reducing light waste and thus ensuring the brightness of the virtual image. The Fresnel direction control structure focuses the light in the direction of the main optical axis to the center of the eye box, and the lens diffusion structure diffuses the light, so that the final emitted light spot is a rectangular spot that can fill the entire eye box, and reduces the light outside the eye box, thereby improving light utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] Figure 1 This is a structural schematic diagram of a light control unit of an image source according to an embodiment of the present disclosure;

[0024] Figure 2This is a structural schematic diagram of a light control unit of an image source according to another embodiment of the present disclosure;

[0025] Figure 3 This is a schematic diagram of the three-dimensional structure of a concave-convex lens array of a light control portion of an image source according to an embodiment of the present disclosure;

[0026] Figure 4 This is a schematic structural diagram of a first linear Fresnel array and a first cylindrical lens array disposed on a first substrate of an image source according to an embodiment of the present disclosure;

[0027] Figure 5 This is a schematic structural diagram of an image source according to another embodiment of the present disclosure, in which a first linear Fresnel array and a first cylindrical lens array are disposed on a first substrate;

[0028] Figure 6 This is a schematic structural diagram of an image source according to another embodiment of the present disclosure, in which a first linear Fresnel array and a first cylindrical lens array are disposed on a first substrate;

[0029] Figure 7 A schematic diagram showing the cooperation between a head-up display and a vehicle according to one embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0030] Various aspects and features of the present disclosure are described herein with reference to the accompanying drawings.

[0031] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0032] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0033] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0034] It should also be understood that although the present disclosure has been described with reference to certain specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the characteristics recited in the claims and are therefore within the scope of protection defined thereby.

[0035] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0036] Specific embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repetitive functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant detail. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but rather serve merely as a basis and representative basis for teaching those skilled in the art to variously employ the present disclosure with substantially any suitable detailed structure.

[0037] According to one aspect of an embodiment of the present disclosure, an image source 40 is provided. The image source 40 includes a backlight assembly and an image generating assembly. The backlight assembly includes a light emitting portion and a light control portion. The light control portion is disposed on the light emitting side of the light emitting portion, and the image generating assembly is disposed on the light emitting side of the light control portion. The light control portion includes a Fresnel direction control structure and a lens diffusion structure. The Fresnel direction control structure is used to adjust the main optical axis direction of light in two directions; the lens diffusion structure is used to adjust the divergence angle of light in two directions.

[0038] The light emission direction is controlled by the Fresnel direction control structure, so that the main optical axis direction of the light can be adjusted in two directions. The light is diffused by the lens diffusion structure, so that the divergence angle of the light can be adjusted in two directions. The two-dimensional direction control and two-dimensional diffusion of the light are achieved by combining the Fresnel direction control structure with the lens diffusion structure. This is beneficial for the light to pass through the image generating component after the main optical axis direction is adjusted by the Fresnel direction control structure and diffused by the lens diffusion structure. The main optical axis direction of the light beam emitted by each pixel of the image generating component matches the design direction, and the light spot corresponding to the light beam emitted by each pixel can match the eye box 90 or be slightly larger than the eye box 90. This can ensure that the light beams of pixels at different positions can cover the eye box 90, and can minimize the light irradiated outside the eye box 90, reduce light waste, and thus ensure the brightness of the virtual image.

[0039] In some examples, the light emitting portion may include a backlight for outputting light. In some optional embodiments, in order to improve light efficiency and reduce light waste and stray light generation, a collimating structure may be provided between the backlight and the light control portion to adjust the light emitted by the backlight into collimated light rays that are parallel to each other. It should be noted that the parallelism in this application is not required to be strictly parallel, as long as the divergence angle of the collimated light beam is less than the target value. The target value may vary depending on the use environment, for example, 1°, 2°, or 5°.

[0040] In some preferred embodiments, a Fresnel direction control structure is used to focus the principal optical axis of the light beams emitted by at least some pixels in the image generation assembly onto a target area within the eyebox 90, which is an area smaller than the eyebox 90. For example, the target area can be the center of the eyebox 90. The light beams are then diffused by the lens diffuser structure to increase their divergence angle, so that the resulting emitted light spot fills the entire eyebox 90, thereby reducing the amount of light outside the eyebox 90 and improving light utilization. Because the Fresnel direction control structure of this embodiment can adjust the principal optical axis in two directions, the accuracy of the principal optical axis control is improved, ensuring that the principal optical axis of light beams emitted by pixels at different locations can be relatively accurately focused on the target area. Accordingly, the lens diffuser structure can adjust the divergence angle in two directions, so that the light spot diffused by the lens diffuser structure has a rectangular shape or a shape that better matches the outline of the eyebox 90, effectively reducing light waste.

[0041] In one embodiment, if Figure 3 As shown, the lens diffusion structure includes a concave-convex lens array 11, which has convex and concave surfaces alternately arranged in two mutually perpendicular directions. The concave-convex lens array 11 has convex and concave surfaces alternately arranged in the x-axis direction and the y-axis direction, thereby forming a concave-convex lens array 11 capable of diffusing in two directions. For example, the concave surface can be a concave spherical surface or a spherical-like surface, and the convex surface can be a convex spherical surface or a spherical-like surface.

[0042] In another embodiment, the lens diffusion structure includes a first cylindrical lens array 12 and a second cylindrical lens array 13. The cylindrical lenses in the first cylindrical lens array 12 extend in a first direction of two directions, and the cylindrical lenses in the second cylindrical lens array 13 extend in a second direction of two directions, with the first direction being perpendicular to the second direction. Specifically, the first cylindrical lens array 12 includes a plurality of first cylindrical lenses, each of which extends along the first direction and is arranged in sequence along the second direction; the second cylindrical lens array 13 includes a plurality of second cylindrical lenses, each of which extends along the second direction and is arranged in sequence along the first direction. This enables the first cylindrical lens array 12 to diffuse light in one direction, while the second cylindrical lens array 13 to diffuse light in another direction. The first cylindrical lens array 12 and the second cylindrical lens array 13 respectively achieve light diffusion functions in two directions. It should be noted that the aforementioned diffusion function is used to adjust the divergence angle of the light beam emitted by each pixel.

[0043] The lens diffusion structure is provided on one or more surfaces. In one embodiment, the lens diffusion structure is provided on one surface. In this case, the lens diffusion structure is a concave-convex lens array 11, and a two-dimensional diffusion effect is achieved by the concave-convex lens array 11. In another embodiment, the lens diffusion structure is provided on multiple surfaces. The lens diffusion structure includes a first cylindrical lens array 12 and a second cylindrical lens array 13. The first cylindrical lens array 12 and the second cylindrical lens array 13 are respectively provided on different surfaces. By setting the extension direction of the first cylindrical lens and the extension direction of the second cylindrical lens to be perpendicular to each other, the first cylindrical lens array 12 and the second cylindrical lens array 13 can respectively achieve diffusion effects in two directions.

[0044] Specifically, the first cylindrical lens is a convex lens or a concave lens; the second cylindrical lens is a convex lens or a concave lens. That is, the multiple first cylindrical lenses of the first cylindrical lens array 12 are all convex lenses or all concave lenses; the multiple second cylindrical lenses of the second cylindrical lens array 13 are all convex lenses or concave lenses, which can be selected according to actual conditions. Alternatively, at least one of the first cylindrical lens array 12 and the second cylindrical lens array 13 is a cylindrical lens array in which concave lenses and convex lenses are alternately arranged (such as Figure 4 As shown, Figure 4 As an example, a schematic diagram showing the first cylindrical lens array 12 as a cylindrical lens array is shown. A cylindrical lens array with this structure can make the transition between two adjacent cylindrical lenses smooth, making it easier to process, so that the shape of the processed cylindrical lens array is more consistent with the design, avoiding the problem that the transition position shape between two adjacent lenses in a lens array of all convex lenses or all concave lenses is inconsistent with the design, resulting in the inability to effectively control light, thereby improving light utilization.

[0045] In one embodiment, the light control unit further includes a substrate, and the surface of the substrate is the aforementioned surface. When the lens diffusion structure comprises a first cylindrical lens array 12 and a second cylindrical lens array 13, the first cylindrical lens array 12 and the second cylindrical lens array 13 are respectively disposed on the opposite sides of a substrate; alternatively, the first cylindrical lens array 12 and the second cylindrical lens array 13 are respectively disposed on two substrates.

[0046] The Fresnel direction control structure is set on one surface or multiple surfaces. In one embodiment, when the Fresnel direction control structure is set on one surface, the Fresnel direction control structure is a free-form surface Fresnel, which can adjust the main optical axis direction of the light in two directions.

[0047] In another embodiment, when the Fresnel direction control structure is provided on multiple surfaces, the Fresnel direction control structure includes at least two of the circular Fresnel, the first linear Fresnel 21, and the second linear Fresnel 22. The circular Fresnel, the first linear Fresnel 21, and the second linear Fresnel 22 can all adjust the main optical axis direction of the light in one direction. By selecting two of them to work together, two-dimensional direction control can be achieved.

[0048] Specifically, the first linear Fresnel 21 includes a plurality of first tooth structures, and the second linear Fresnel 22 includes a plurality of second tooth structures. The first tooth structures extend perpendicularly to the second tooth structures, and the arrangement direction of the plurality of first tooth structures is perpendicular to the arrangement direction of the plurality of second tooth structures. The circular Fresnel includes a plurality of third tooth structures, each of which is annular.

[0049] The light-control unit further includes a substrate, the surface of which is the aforementioned surface. In one embodiment, one of the circular Fresnel, the first linear Fresnel 21, and the second linear Fresnel 22 is disposed on one surface of a substrate, and the other of the circular Fresnel, the first linear Fresnel 21, and the second linear Fresnel 22 is disposed on another surface of the substrate. In this case, the Fresnel direction-control structure is disposed on the same substrate. In another embodiment, one of the circular Fresnel, the first linear Fresnel 21, and the second linear Fresnel 22 is disposed on one substrate, and the other of the circular Fresnel, the first linear Fresnel 21, and the second linear Fresnel 22 is disposed on another substrate. In this case, the Fresnel direction-control structure is disposed on different substrates.

[0050] Specifically, there are one or more substrates. In one embodiment, when there is only one substrate, the concave-convex lens array 11 and the free-form surface Fresnel are respectively arranged on both side surfaces of one substrate.

[0051] In one embodiment, the lens diffusion structure includes multiple lenses, and the Fresnel direction control structure includes multiple tooth structures. Each lens has a width a less than or equal to 300 microns, and a height b less than or equal to 30 microns. Each tooth structure has a width c less than or equal to 300 microns, and a height d less than or equal to 150 microns. By properly sizing the lenses and tooth structures, the structural rationality of the lens diffusion structure and the Fresnel direction control structure is ensured, ensuring that the direction control and diffusion granularity of light meet the requirements, avoiding streaks or uneven brightness, and ensuring process feasibility.

[0052] In one embodiment, the refractive index of the material of the light-controlling portion is greater than or equal to 1.5 and less than 1.7. By reasonably constraining the refractive index of the light-controlling portion, it is helpful to ensure the light transmission efficiency.

[0053] In one embodiment, the thickness of the light-controlling portion is within 5 mm.

[0054] The image source 40 of the present disclosure is described below with reference to specific preferred embodiments. Figure 1 and Figure 2 The preferred embodiment shown is capable of two-dimensional directional control and two-dimensional diffusion.

[0055] like Figure 1 As shown, in Figure 1 In a preferred embodiment shown, the light control portion includes a first substrate 31 and a second substrate 32, with the second substrate 32 located on the side of the first substrate 31 away from the light exit portion. The Fresnel direction control structure includes a first linear Fresnel 21 and a second linear Fresnel 22. The lens diffusion structure includes a first cylindrical lens array 12 and a second cylindrical lens array 13. The first linear Fresnel 21 and the second linear Fresnel 22 are respectively disposed on the light entrance and exit surfaces of the first substrate 31, while the second cylindrical lens array 13 and the first cylindrical lens array 12 are respectively disposed on the light entrance and exit surfaces of the second substrate 32. Preferably, the extension direction of the first cylindrical lens can be set to be the same as the extension direction of the first tooth structure. This arrangement allows the parallel light emitted from the light exit portion to first be directionally controlled in two directions by the first linear Fresnel 21 and the second linear Fresnel 22, and then diffused in two directions by the first cylindrical lens array 12 and the second cylindrical lens array 13.

[0056] Optionally, the inclination angles of the tooth surfaces of the multiple first tooth structures of the first linear Fresnel 21 are all different or partially different, and the width of the first tooth structure in the central area of ​​the first linear Fresnel 21 is the same as or different from the width of the first tooth structure in the peripheral area of ​​the first linear Fresnel 21; the inclination angles of the tooth surfaces of the multiple second tooth structures of the second linear Fresnel 22 are all different or partially different, and the width of the second tooth structure in the central area of ​​the second linear Fresnel 22 is the same as or different from the width of the second tooth structure in the peripheral area of ​​the second linear Fresnel 22.

[0057] In another preferred embodiment, the light control unit further includes a first substrate 31 and a second substrate 32. The second substrate 32 is located on a side of the first substrate 31 away from the light exit portion. One of the circular Fresnel, the first linear Fresnel 21, and the second linear Fresnel 22 is disposed on the light incident surface of the first substrate 31, and the other of the circular Fresnel, the first linear Fresnel 21, and the second linear Fresnel 22 is disposed on the light incident surface of the second substrate 32. One of the first cylindrical lens array 12 and the second cylindrical lens array 13 is disposed on the light exit surface of the first substrate 31, and the other of the first cylindrical lens array 12 and the second cylindrical lens array 13 is disposed on the light exit surface of the first substrate 31. This arrangement enables the adjustment of the direction of the principal optical axis of the parallel light emitted by the light exit portion and incident on the light control unit to be sequentially adjusted in the following order: adjustment of the principal optical axis direction of the light in one direction, adjustment of the divergence angle of the light in one direction, adjustment of the principal optical axis direction of the light in another direction, and adjustment of the divergence angle of the light in another direction. This combined adjustment achieves adjustment of the principal axis direction of the light in two directions and adjustment of the divergence angle of the light in two directions.

[0058] Figure 2 A preferred embodiment is shown in FIG. A first linear Fresnel 21 and a first cylindrical lens array 12 are disposed on the light-entry and light-exit surfaces of a first substrate 31, respectively. The first cylindrical lenses extend in the same direction as the first tooth structure. A second linear Fresnel 22 and a second cylindrical lens array 13 are disposed on the light-entry and light-exit surfaces of a second substrate 32, respectively. The second cylindrical lenses extend in the same direction as the second tooth structure. The first linear Fresnel 21 and the second linear Fresnel 22 extend in different directions, for example, perpendicular to each other. Of course, one of the first linear Fresnel 21 and the second linear Fresnel 22 can be replaced with a circular Fresnel.

[0059] In another preferred embodiment, the light control unit further includes a first substrate 31 and a second substrate 32, the lens diffusion structure includes a concave-convex lens array 11, and the Fresnel direction control structure includes a first linear Fresnel 21 and a second linear Fresnel 22. The concave-convex lens array 11 is disposed on one surface of the first substrate 31, the first linear Fresnel 21 is disposed on one of the other surface of the first substrate 31, one surface of the second substrate 32, and the other surface of the second substrate 32; and the second linear Fresnel 22 is disposed on the other of the other surface of the first substrate 31, one surface of the second substrate 32, and the other surface of the second substrate 32. This arrangement allows the concave-convex lens array 11 to adjust the divergence angle of light in two directions, while the first linear Fresnel 21 and the second linear Fresnel 22 respectively adjust the main axis direction of the light in two directions.

[0060] When the first linear Fresnel 21 and the second linear Fresnel 22 are respectively disposed on the light incident surface of the first substrate 31 and the light incident surface of the second substrate 32, the concave-convex lens array 11 can be disposed on the light exit surface of the first substrate 31 or the light exit surface of the second substrate 32. Preferably, the concave-convex lens array 11 is disposed on the light exit surface of the second substrate 32. This arrangement positions the concave-convex lens array 11, which is used to diffuse light, between the Fresnel direction control structure, which is used to adjust the light direction, and the image generation component. The Fresnel direction control structure converges the principal optical axis of the light into the central area of ​​the eye box 90, which can be an area within a certain range around the center of the eye box 90. The concave-convex lens array 11 diffuses the light so that the diffused light spot covers the eye box 90.

[0061] In this embodiment, the light control unit and the image generation component are spaced apart, and a light uniformity structure such as a polarizing light uniformity film can be provided between the light control unit and the image generation component. The light uniformity structure uniformizes the light at the pixel level to improve the uniformity of the backlight. The image generation component can be a liquid crystal screen.

[0062] According to another aspect of an embodiment of the present disclosure, an image source 40 is provided. Image source 40 includes a backlight assembly and an image generating assembly. The backlight assembly includes a light emitting portion and a light control portion. The light control portion is disposed on the light emitting side of the light emitting portion, and the image generating assembly is disposed on the light emitting side of the light control portion. The light control portion includes: a Fresnel direction control structure to adjust the main optical axis direction of light in one direction; and a lens diffusion structure to adjust the divergence angle of light in one direction.

[0063] The Fresnel direction control structure adjusts the main optical axis of the light in one direction, thereby achieving one-dimensional directional control of the light. The lens diffusion structure adjusts the diffusion angle of the light in one direction, thereby achieving one-dimensional diffusion of the light. This helps to improve the uniform light effect while ensuring high brightness. The present disclosure uses the Fresnel direction control structure to focus the main light to the center of the eye box 90, and uses the lens diffusion structure to diffuse the light, so that the final emitted light spot can fill the entire eye box 90, while reducing the light outside the eye box 90 and improving light utilization.

[0064] The light control unit also includes a substrate, which may be one or more substrates. In one embodiment, when there is only one substrate, one of the first and second cylindrical lens arrays 12 and 13 is disposed on one surface of the substrate, and the linear Fresnel lens is disposed on the other surface of the substrate. In another embodiment, when there are multiple substrates, one of the first and second cylindrical lens arrays 12 and 13 is disposed on one substrate, and the linear Fresnel lens is disposed on another substrate.

[0065] exist Figure 4In the preferred embodiment shown, the light control part also includes a first substrate 31, and the lens diffusion structure is a cylindrical lens array. The cylindrical lens array includes a plurality of cylindrical lenses, which can all be concave lenses, or all be convex lenses, or a combination of concave lenses and convex lenses. Preferably, the cylindrical lens array is a combination of concave lenses and convex lenses, so that a smooth transition can be achieved at the connection position between two adjacent lenses. On the one hand, it can reduce the difficulty of processing, and on the other hand, it can ensure that the processed structure is more consistent with the design, thereby effectively improving the light efficiency. The Fresnel direction control structure is a linear Fresnel. The linear Fresnel is arranged on the light incident surface of the first substrate 31, and the cylindrical lens array is arranged on the light emitting surface of the first substrate 31. This arrangement allows the parallel light emitted from the light emitting part to be first adjusted in the one-dimensional direction of the linear Fresnel, and then emitted after being diffused in the one-dimensional direction of the cylindrical lens array. Optionally, in Figure 4 In the embodiment, the first cylindrical lens array 12 is the cylindrical lens array of the preferred embodiment, and the first linear Fresnel 21 is the linear Fresnel of the preferred embodiment.

[0066] exist Figure 5 In the preferred embodiment shown, the light control unit further includes a first substrate 31, and the lens diffusion structure is a cylindrical lens array, all of which are concave lenses. In this case, the Fresnel direction control structure is a linear Fresnel, which is arranged on the light incident surface of the first substrate 31, and the cylindrical lens array is arranged on the light exit surface of the first substrate 31. Optionally, Figure 5 In the embodiment, the first cylindrical lens array 12 is the cylindrical lens array of the preferred embodiment, and the first linear Fresnel 21 is the linear Fresnel of the preferred embodiment.

[0067] exist Figure 6 In the preferred embodiment shown, the light control unit further includes a first substrate 31, and the lens diffusion structure is a cylindrical lens array, all of which are convex lenses. The Fresnel direction control structure is a linear Fresnel, which is arranged on the light incident surface of the first substrate 31, and the cylindrical lens array is arranged on the light exit surface of the first substrate 31. Optionally, Figure 6 In the embodiment, the first cylindrical lens array 12 is the cylindrical lens array of the preferred embodiment, and the first linear Fresnel 21 is the linear Fresnel of the preferred embodiment.

[0068] In one embodiment, the lens diffusion structure includes a plurality of lenses, and the Fresnel direction control structure includes a plurality of tooth structures. The width a of each lens is less than or equal to 300 microns, and the height b of each lens is less than or equal to 30 microns. The width c of each tooth structure is less than or equal to 300 microns, and the height d of each tooth structure is less than or equal to 150 microns. By properly constraining the dimensions of each lens and each tooth structure, the light diffusion effect of the lens diffusion structure and the light direction adjustment effect of the Fresnel direction control structure are ensured, thereby ensuring the reliability and workability of both.

[0069] Optionally, the backlight group of the image source 40 provided in the embodiment of the present disclosure is suitable for a single lamp tube structure or a multi-lamp tube structure. When it is a single lamp tube structure, the single lamp tube includes multiple lamps, and the multiple lamps are arranged at intervals along one direction; when it is a multi-lamp tube structure, the multiple lamp tubes are arranged in sequence along one direction, and each lamp tube has one or two or more lamps.

[0070] like Figure 7 As shown, the embodiment of the present disclosure further provides a head-up display 70, which includes the aforementioned image source 40. By employing the aforementioned image source 40, the head-up display 70 can control the main axis direction of the light and the divergence angle of the light, so that the light emitted by the image source 40 can be focused to the center of the display area while being diffused, ensuring a uniform light effect, and then transmitted to the imaging board or the vehicle's windshield for display.

[0071] exist Figure 7 In the preferred embodiment shown, the head-up display 70 further includes a plane mirror 50 located on the light-emitting side of the image source 40 and a free-form mirror 60 located in the reflection path of the plane mirror 50. The virtual image light emitted by the image source 40 is projected out of the head-up display 70 by the plane mirror 50 and the free-form mirror 60.

[0072] like Figure 7 As shown, an embodiment of the present disclosure further provides a vehicle, including the aforementioned image source 40, or including the aforementioned head-up display 70. The vehicle has an imaging board or a windshield 80, and the aforementioned image source 40 or head-up display 70 projects image light onto the imaging board or the vehicle's windshield 80 for display, so that the user can directly see the image without having to lower their head.

[0073] The above description is merely a preferred embodiment of the present disclosure and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also includes other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned disclosed concepts. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this disclosure.

[0074] In addition, although each operation is described in a specific order, this should not be understood as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details have been included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

Claims

1. An image source, characterized in that: The device comprises a backlight assembly and an image generating assembly, wherein the backlight assembly comprises a light emitting portion and a light controlling portion, wherein the light controlling portion is arranged at the light emitting side of the light emitting portion, and the image generating assembly is arranged at the light emitting side of the light controlling portion, and the light controlling portion comprises: Fresnel direction control structure to adjust the main optical axis direction of the light in two directions; The lens diffusion structure is used to adjust the divergence angle of the light in the two directions.

2. The image source according to claim 1, characterized in that: The lens diffusion structure includes a concave-convex lens array, or, The lens diffusion structure includes a first cylindrical lens array and a second cylindrical lens array, wherein the cylindrical lenses in the first cylindrical lens array extend in a first direction of the two directions, and the cylindrical lenses in the second cylindrical lens array extend in a second direction of the two directions.

3. The image source according to claim 1, characterized in that: The lens diffusion structure is arranged on one or more surfaces, When the lens diffusion structure is arranged on one surface, the lens diffusion structure is a concave-convex lens array, and the concave-convex lens array has convex surfaces and concave surfaces arranged alternately in two directions; or, When the lens diffusion structure is arranged on multiple surfaces, the lens diffusion structure includes a first column lens array and a second column lens array, the first column lens array and the second column lens array are respectively arranged on different surfaces, the first column lens array includes a plurality of first column lenses, the second column lens array includes a plurality of second column lenses, and the extension direction of the first column lens is perpendicular to the extension direction of the second column lens.

4. The image source according to claim 3, characterized in that: The first cylindrical lens is a convex lens or a concave lens; and / or, The second cylindrical lens is a convex lens or a concave lens.

5. The image source according to claim 3, characterized in that: The light control unit further includes a substrate. The first cylindrical lens array and the second cylindrical lens array are respectively arranged on both side surfaces of a substrate; or, the first cylindrical lens array and the second cylindrical lens array are respectively arranged on two substrates.

6. The image source according to claim 3, characterized in that: The Fresnel direction control structure is arranged on one or more surfaces. When the Fresnel direction control structure is arranged on a surface, the Fresnel direction control structure is a free-form surface Fresnel; When the Fresnel direction control structure is arranged on multiple surfaces, the Fresnel direction control structure includes at least two of a circular Fresnel, a first linear Fresnel, and a second linear Fresnel, the first linear Fresnel includes a plurality of first tooth structures, the second linear Fresnel includes a plurality of second tooth structures, and an extension direction of the first tooth structure is perpendicular to an extension direction of the second tooth structure.

7. The image source according to claim 6, characterized in that: The light control unit further includes a substrate. One of the circular Fresnel, the first linear Fresnel and the second linear Fresnel is disposed on one side surface of the substrate, and the other of the circular Fresnel, the first linear Fresnel and the second linear Fresnel is disposed on the other side surface of the substrate; or One of the circular Fresnel, the first linear Fresnel, and the second linear Fresnel is disposed on one substrate, and the other of the circular Fresnel, the first linear Fresnel, and the second linear Fresnel is disposed on another substrate.

8. The image source according to claim 6, characterized in that: The light control unit further includes a substrate, and the substrate is one or more. When the substrate is one, the concave-convex lens array and the free-form surface Fresnel are respectively arranged on both side surfaces of the substrate.

9. The image source according to claim 6, characterized in that: The light control unit further includes a first substrate and a second substrate, the second substrate is located on a side of the first substrate away from the light output unit, the Fresnel direction control structure includes the first linear Fresnel and the second linear Fresnel, the lens diffusion structure includes the first cylindrical lens array and the second cylindrical lens array, The first linear Fresnel and the second linear Fresnel are respectively arranged on both side surfaces of the first substrate, and the first cylindrical lens array and the second cylindrical lens array are respectively arranged on both side surfaces of the second substrate.

10. The image source according to claim 6, characterized in that: The light control portion further includes a first substrate and a second substrate, wherein the second substrate is located on a side of the first substrate away from the light output portion. One of the circular Fresnel, the first linear Fresnel and the second linear Fresnel is disposed on the light incident surface of the first substrate, and the other of the circular Fresnel, the first linear Fresnel and the second linear Fresnel is disposed on the light incident surface of the second substrate; One of the first cylindrical lens array and the second cylindrical lens array is arranged on the light exit surface of the first substrate, and the other of the first cylindrical lens array and the second cylindrical lens array is arranged on the light exit surface of the first substrate.

11. The image source according to claim 6, characterized in that: The light control unit further includes a first substrate and a second substrate, the lens diffusion structure includes the concave-convex lens array, and the Fresnel direction control structure includes the first linear Fresnel and the second linear Fresnel. The concave-convex lens array is arranged on one side surface of the first substrate, The first linear Fresnel is disposed on one of the other side surface of the first substrate, the one side surface of the second substrate, and the other side surface of the second substrate; The second linear Fresnel is disposed on the other of the other side surface of the first substrate, the one side surface of the second substrate, and the other side surface of the second substrate.

12. The image source according to any one of claims 1 to 11, characterized in that: The lens diffusion structure includes a plurality of lenses, and the Fresnel direction control structure includes a plurality of tooth structures. The width of each lens is less than or equal to 300 microns, and the height of each lens is less than or equal to 30 microns; and / or, The width of each tooth structure is less than or equal to 300 micrometers, and the height of each tooth structure is less than or equal to 150 micrometers.

13. An image source, characterized in that: The device comprises a backlight assembly and an image generating assembly, wherein the backlight assembly comprises a light emitting portion and a light controlling portion, wherein the light controlling portion is arranged at the light emitting side of the light emitting portion, and the image generating assembly is arranged at the light emitting side of the light controlling portion, and the light controlling portion comprises: Fresnel direction control structure to adjust the main optical axis direction of the light in one direction; The lens diffusion structure is used to adjust the divergence angle of the light in the one direction.

14. The image source according to claim 13, characterized in that: The lens diffusion structure includes a cylindrical lens array; the Fresnel direction control structure is a linear Fresnel.

15. The image source according to claim 13, characterized in that: The lens diffusion structure includes a plurality of lenses, and the Fresnel direction control structure includes a plurality of tooth structures. The width of each lens is less than or equal to 300 microns, and the height of each lens is less than or equal to 30 microns; and / or, The width of each tooth structure is less than or equal to 300 micrometers, and the height of each tooth structure is less than or equal to 150 micrometers.

16. A head-up display, characterized in that: The image source comprises the image source as claimed in any one of claims 1 to 15.

17. A vehicle, characterized in that: The method comprises the image source according to any one of claims 1 to 15, or comprises the head-up display according to claim 16.

Images