Micro-nano lens structure and phud backlight module

Abstract

The utility model aims at providing a kind of micro-nano lens structure and PHUD backlight module, it includes lens block, the surface of lens block is provided with several integrated structure's convex part, the structure of convex part is at least one of cylindrical surface, V face, taper, ellipsoidal surface, irregular free curved surface, and each convex part is equidistant or non-equidistant distribution.Such, the surface of lens block forms several convex parts of integrated structure, compared with the structure of the existing multilayer film material stacking, can reduce light energy loss, improve light utilization, and reduce power consumption, reduce heat loss, further, it can also simplify assembly step, reduce manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the technical field of optical components, and in particular to a micro / nano lens structure and a PHUD backlight module. Background Technology

[0002] PHUD (Projected Head-Up Display) is a mainstream HUD technology solution in the automotive and aviation fields that projects information directly onto the windshield using optical projection technology.

[0003] Currently, PHUD backlight modules generally adopt a multi-layer optical film stacking scheme to achieve light uniformity. This scheme requires the configuration of a diffuser plate and four layers of diffuser films with different functions (DBEF polarizing film, 90°BEF brightness enhancement film, 0°BEF brightness enhancement film, and ordinary diffuser film).

[0004] However, this multi-layer film stacking structure has the following drawbacks: First, it has low optical efficiency, with the diffuser plate and multiple diffuser films causing significant light energy loss, resulting in low overall light utilization; second, the light energy loss leads to increased power consumption and excessive heat loss; moreover, the diffuser film material is expensive and the manufacturing process is complex; finally, multiple diffuser films need to be accurately stacked during assembly, making the assembly process complex. Therefore, to solve the above technical problems, the micro / nano lens structure and PHUD backlight module of this application are proposed. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a micro / nano lens structure and PHUD backlight module to replace the multilayer film structure.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A micro / nano lens structure, comprising:

[0008] A lens block, the surface of which is provided with a plurality of integrally structured protrusions, the protrusions being constructed as at least one of cylindrical, V-shaped, conical, ellipsoidal, and irregular freeform surfaces, and the protrusions being distributed at equal or non-equal intervals.

[0009] Optionally, the width / diameter of the protrusion is 1μm to 50μm.

[0010] Optionally, the height of the protrusion is 0.5 μm to 20 μm.

[0011] Optionally, the distance between any two adjacent protrusions is 2μm to 100μm.

[0012] Optionally, both the lens block and the protrusion are made of PC material.

[0013] Optionally, the cylindrical surface can be either a cylindrical surface or a non-cylindrical surface.

[0014] Optionally, the protrusion is spherical.

[0015] Optionally, the conical surface is one of a circular conical surface, an elliptical conical surface, or a pyramidal surface.

[0016] Optionally, the conical surface is a regular conical surface or an oblique conical surface.

[0017] A PHUD backlight module includes any of the micro / nano lens structures mentioned above, and also includes a bottom shell and a lamp plate. The bottom shell has an inner cavity, and the lamp plate is disposed on the inner bottom wall of the inner cavity. A positioning post is disposed at each of the opposite ends of the bottom shell located in the inner cavity, and a positioning part is disposed at each of the opposite ends of the lens block. When the lens block is fastened at the opening of the inner cavity, the two positioning posts are respectively inserted into the two positioning parts.

[0018] Compared with the prior art, the present invention has at least the following advantages:

[0019] This invention discloses a micro / nano lens structure and a PHUD backlight module, comprising a lens block. The surface of the lens block has several integrated protrusions. These protrusions are constructed from at least one of the following: cylindrical, V-shaped, conical, ellipsoidal, or irregular freeform surface, and are distributed equidistantly or non-equidistantly. This integrated structure of protrusions on the lens block surface, compared to existing multilayer film stacking structures, reduces light energy loss, improves light utilization, lowers power consumption, reduces heat loss, simplifies assembly steps, and reduces manufacturing costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the micro / nano lens structure according to one embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the protrusion of this utility model being a cylindrical surface;

[0023] Figure 3 This is a schematic diagram of the structure of the present invention, where the protrusion is a V-shaped surface;

[0024] Figure 4 This is a schematic diagram of the structure of the protrusion of this utility model, which is a regular square pyramidal surface;

[0025] Figure 5 This is a schematic diagram of the structure of the protrusion of this utility model, which is an oblique quadrangular pyramidal surface;

[0026] Figure 6 This is a schematic diagram of the structure of the protrusion of this utility model being a spherical surface;

[0027] Figure 7 This is a schematic diagram of the structure of a PHUD backlight module according to one embodiment of the present invention. Detailed Implementation

[0028] To facilitate understanding of this utility model, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model.

[0029] like Figures 1 to 6 As shown, a micro / nano lens structure 10 includes a lens block 110. The surface of the lens block 110 is provided with a plurality of integrally structured protrusions 120. The protrusions 120 are constructed as at least one of cylindrical, V-shaped, conical, ellipsoidal, and irregular freeform surfaces, and the protrusions 120 are distributed at equal or non-equal intervals.

[0030] It should be noted that each protrusion 120 is integrally formed on the top surface of the lens block 110, wherein the protrusion 120 is at least one of a cylindrical surface, a V-shaped surface, a conical surface, an ellipsoidal surface, and an irregular freeform surface. Specifically, only one type of protrusion 120 of a cylindrical surface, a V-shaped surface, a conical surface, an ellipsoidal surface, or an irregular freeform surface may be formed on the surface of the lens block 110, or different shapes of protrusions 120 may be formed in different regions of the lens block 110. For example, the shapes of the protrusions 120 formed in the middle and edge positions of the lens block 110 may be different, or the shapes of the protrusions 120 formed in the left and right regions of the lens block 110 may be different. According to actual needs, it is only necessary to ensure that the formed protrusions 120 are one of a cylindrical surface, a V-shaped surface, a conical surface, an ellipsoidal surface, or an irregular freeform surface. Thus, when the micro / nano lens structure 10 of this application is installed in the PHUD backlight module, light enters from the bottom side of the lens block 110 and exits from each protrusion 120. The protrusions 120 refract / reflect the light, thereby improving light collimation and reducing backlight scattering loss, thus enhancing the brightness and projection clarity of the PHUD. Compared to existing structures that require multi-layer film stacking to homogenize light, the micro / nano lens structure 10 provided in this application is a single-plate structure, integrally injection molded, reducing separate production and subsequent stacking and assembly processes, thus improving production efficiency by reducing production steps. Furthermore, existing multi-layer film structures suffer significant light energy loss during light propagation, resulting in low overall light utilization. However, the single-plate structure of this application reduces light energy loss, improves light utilization, and effectively reduces power consumption and heat loss. Further, in one embodiment, the lens block 110 and each protrusion 120 are integrally injection molded from PC material. Thus, compared to existing DBEF polarizing films, 90°BEF brightness enhancement films, 0°BEF brightness enhancement films, and ordinary diffusion films, PC material is more competitively priced, thereby effectively reducing production costs. Furthermore, compared to multilayer film stacking structures, the micro-nano lens structure of this application significantly reduces the amount of film used, compresses the thickness of the backlight module, and saves space.

[0031] In one embodiment, the width / diameter of the protrusion 120 is 1 μm to 50 μm. The height of the protrusion 120 is 0.5 μm to 20 μm. The distance between any two adjacent protrusions 120 is 2 μm to 100 μm.

[0032] In this way, the protrusion 120 forms a fine micro-nano structure on the surface of the lens block 110, thereby ensuring uniform light distribution.

[0033] like Figure 2As shown, in one embodiment, when the protrusion 120 is a cylindrical structure, it can be a cylindrical structure or a non-cylindrical structure. A non-cylindrical structure refers to a cylindrical structure formed by a smooth, non-circular curve. Further, when the protrusion 120 is a cylindrical structure, the height of the protrusion 120 is 1 μm to 20 μm, the width of the protrusion 120 is 5 μm to 50 μm, the radius of curvature of the protrusion 120 is 2 μm to 50 μm, the aspect ratio of the protrusion 120 is 0.1 to 2, and the distance between any two adjacent protrusions 120 is 5 μm to 50 μm.

[0034] It should be noted that by setting the protrusion 120 as a cylindrical structure, unidirectional collimation of light can be achieved, for example, compressing the divergence angle along the horizontal or vertical direction (whether along the horizontal or vertical direction depends on whether the protrusion 120 of the cylindrical structure is along the horizontal or vertical direction). In one embodiment, when the protrusion 120 is a cylindrical structure, the height of the protrusion 120 is 5μm, the width of the protrusion 120 is 10μm, the radius of curvature of the protrusion 120 is 5μm, the aspect ratio of the protrusion 120 is H1 / W1 = 0.5, and the distance between any two adjacent protrusions 120 is 10μm. That is, the protrusions 120 are arranged in a densely packed, sequentially adjacent structure.

[0035] like Figure 3 As shown, in one embodiment, when the protrusion 120 is constructed as a V-shaped surface, the height of the protrusion 120 is 0.5μm to 10μm, the bottom width of the protrusion 120 is 2μm to 10μm, the tilt angle of the protrusion 120 is 30° to 120°, and the distance between any two adjacent protrusions 120 is 2μm to 20μm.

[0036] It should be noted that by setting the protrusion 120 as a V-shaped surface structure, efficient collimation of light is achieved through light refraction. The V-shaped surface structure can be either symmetrical or asymmetrical. Specifically, a symmetrical V-shaped surface structure refers to a structure where the two side planes forming the protrusion 120 have the same angle relative to the surface of the lens block 110, i.e., its cross-section is an isosceles triangle. A symmetrical V-shaped surface structure enables symmetrical light control, such as bidirectional collimation of perpendicularly incident light, and is also easier to manufacture. Furthermore, an asymmetrical V-shaped surface structure refers to a structure where the two side planes forming the protrusion 120 have different angles relative to the surface of the lens block 110, i.e., its cross-section is a non-isosceles triangle. An asymmetrical V-shaped surface structure can guide light in a specific direction to enhance collimation in that direction, achieving unidirectional light control. In particular, in a PHUD backlight module, the asymmetrical V-shaped surface structure located at the edge can effectively uniformize brightness by setting a gradual tilt angle. Furthermore, the optical effects of the asymmetric V-shaped surface are as follows: For perpendicularly incident light, the light rays will be concentrated and deflected towards the side with the smaller tilt angle. Therefore, by setting the protrusions 120 of the asymmetric V-shaped surface structure as a continuous "sawtooth structure," enhanced unidirectional collimation can be achieved. Furthermore, for obliquely incident light, the asymmetric V-shaped surface shell naturally adapts to the oblique incident angle, thereby reducing stray light. In one embodiment, when the protrusion 120 is a V-shaped surface, the height of the protrusion 120 is 8 μm, the bottom width of the protrusion 120 is 5 μm, the top of the protrusion 120 is an acute angle, so the top width tends to be 0 μm with an error ≤ 0.3 μm, and the distance between any two adjacent protrusions 120 is 5 μm. When the tilt angles of the two side planes of the protrusion 120 are both 60°, the protrusion 120 is a symmetric V-shaped surface. When the inclination angles of the two side planes of the protrusion 120 are 30° and 60° respectively, the protrusion 120 becomes an asymmetrical V-shaped surface.

[0037] like Figure 4 and Figure 5 As shown, in one embodiment, the conical surface can be one of a circular conical surface, an elliptical conical surface, or a pyramidal surface. Further, the conical surface can be a regular conical surface or an oblique conical surface.

[0038] It should be noted that conical surfaces can be classified into circular conical surfaces, elliptical conical surfaces, and pyramidal surfaces according to their shape. A circular conical surface refers to a symmetrical cone with a circular base and straight generatrices on its lateral surfaces. Its optical characteristic is that light rays are symmetrically deflected along the central axis, suitable for multi-directional uniform collimation, thus achieving wide-angle uniform illumination. Furthermore, an elliptical conical surface refers to an asymmetrical cone with an elliptical base and elliptical curve generatrices on its lateral surfaces. Its optical characteristic is strong collimation along the major axis and wider diffusion along the minor axis, mainly suitable for shaping rectangular light spots. Further, a pyramidal surface refers to a pyramidal structure with a polygonal base (such as a triangle, square, or hexagon) and flat lateral surfaces. Its optical characteristic is that it allows for discrete directional control, forming multiple collimated beams along the edges, achieving multi-directional uniform illumination. Furthermore, conical surfaces can be classified into upright conical surfaces and oblique conical surfaces according to whether they are tilted. In an upright conical surface, the central axis of the cone is parallel to the normal of the lens block 110. The optical effect of an upright conical surface is symmetrical deflection of light rays, forming a centrally symmetrical light field. Furthermore, the central axis of the oblique conical surface is inclined to the normal of the lens block 110. Its optical effect is that light rays are concentrated and deflected towards the inclined side, which can effectively compensate for brightness when located at the edge.

[0039] like Figure 4 As shown, in one embodiment, the protrusion 120 is constructed as a quadrangular pyramid, the height of the protrusion 120 is 1μm to 20μm, the bottom side length of the protrusion 120 is 5μm to 50μm, the cone angle of the protrusion 120 is 10° to 70°, and the distance between any two adjacent protrusions 120 is 5μm to 50μm.

[0040] It should be noted that the height of the protrusion 120 refers to the vertical distance from the apex of the pyramid to the surface of the lens block 110. The bottom side length of the protrusion 120 refers to the side length of the square base of the pyramid, and the cone angle of the protrusion 120 refers to the angle between a single cone face and the central axis. Furthermore, while the apex of a pyramid is theoretically an acute angle, due to manufacturing processes, it cannot be acute; therefore, the radius of the cone's fillet can only approach 0 μm. In one embodiment, the error of the cone's fillet radius is ≤1 μm. Furthermore, the distance between any two adjacent pyramid faces is 5 μm to 50 μm. For example, the distance between any two adjacent pyramid faces is equal to the bottom side length of the pyramid face. In this way, the protrusions 120 of each pyramid shape are sequentially abutted to form a regular arrangement structure.

[0041] In one embodiment, the protrusion 120 is an ellipsoid. Specifically, the radius of curvature of the ellipsoid varies with position, being smallest at the apex and approaching infinity at the edges. Therefore, when light is incident perpendicularly, strong refraction occurs at the apex, while the refraction at the edges is gradual, achieving collimation in the central region. When light is incident obliquely, asymmetric refraction occurs, which can compensate for edge attenuation.

[0042] In one embodiment, when the protrusion 120 is constructed as an ellipsoid, the height of the protrusion 120 is 2μm to 20μm, the major axis radius of the protrusion 120 is 5μm to 50μm, the minor axis radius of the protrusion 120 is 2μm to 20μm, the vertex curvature radius of the protrusion 120 is 0.5μm to 10μm, the eccentricity of the protrusion 120 is 0.3 to 0.9, and the distance between any two adjacent protrusions 120 is 10μm to 100μm.

[0043] Furthermore, in one embodiment, the protrusion 120 is a sphere, specifically an ellipsoid. This means that when the major semi-axis, first minor semi-axis, and second minor semi-axis of the ellipsoid are all equal to a certain value, the ellipsoid is formed as a spherical structure with that fixed radius. Thus, when light is incident perpendicularly, it converges towards the normal direction, resulting in high collimation in the central region. When light is incident obliquely, it undergoes asymmetric refraction. Further, in one embodiment, when the protrusion 120 is a sphere, a hexagonal close-packed array is used to effectively reduce gap light loss.

[0044] Furthermore, such as Figure 6 As shown, in one embodiment, the protrusion 120 is an irregular free-form surface structure. Specifically, when the protrusion 120 is an irregular free-form surface structure, a hexagonal close-packed array is preferred to reduce gap light loss. In particular, manufacturing the micro / nano lens structure 10 with an irregular free-form surface protrusion 120 using PC material and a mold is more cost-effective. This is because irregular free-form surfaces cannot be represented by the standard quadratic surface equation. Therefore, by designing a structurally stable mold and then performing press molding, the stability and yield of the irregular free-form surface protrusion 120 can be improved. In one embodiment, when the protrusion 120 is an irregular free-form surface, the maximum height of the protrusion 120 is 1–50 μm, and the curvature gradient is 0.01 μm⁻¹–0.1 μm⁻¹, where the curvature gradient refers to the degree of curvature of the irregular free-form surface.

[0045] like Figure 7 As shown, a PHUD backlight module 1 includes any of the micro / nano lens structures 10 mentioned above, as well as a bottom shell 20 and a lamp plate. The bottom shell 20 has an inner cavity 21, and the lamp plate is disposed on the inner bottom wall of the inner cavity 21. A positioning post 30 is respectively disposed at opposite ends of the bottom shell 20 located in the inner cavity 21. A positioning part 130 is respectively disposed at opposite ends of the lens block 110. When the lens block 110 is fastened at the opening of the inner cavity 21, the two positioning posts 30 are respectively inserted into the two positioning parts 130.

[0046] It should be noted that the lamp board is fixedly installed on the inner bottom wall of the inner cavity 21 by screws. Since the installation position of the lens block 110 and the bottom shell 20 will affect the collimation effect of the light, in order to ensure that the lens block 110 can be accurately installed on the bottom shell 20, a positioning post 30 is respectively set on the opposite ends of the bottom shell 20. Then, a hole is opened on the positioning part 130 at both ends of the lens block 110 so that the two positioning posts 30 pass through the two holes for precise positioning, thereby ensuring that the lens block 110 can be accurately installed and improving the assembly efficiency of the backlight module.

[0047] Furthermore, such as Figure 7 As shown, in one embodiment, one of the positioning posts 30 is a cylinder and the other is a square post. One of the two positioning parts 130 has a circular hole 131 and the other has an open square groove 132. The cylinder is used to pass through the circular hole 131 and the square post is used to pass through the open square groove.

[0048] It should be noted that, in order to ensure that the lens block 110 is accurately installed on the base shell 20 and to avoid the lens block 110 being installed in the opposite direction to the base shell 20, the positioning post 30 and the positioning part 130 are configured as described above to prevent mistaken installation. Thus, the cylindrical fitting passes through the circular hole 131, and the square post fits through the open square slot, allowing the lens block 110 to be accurately positioned and assembled with the base shell 20. In particular, it should be noted that the open square slot 132 is a single-sided open, non-closed slot structure. This design has the following advantages: during assembly, after ensuring that the cylindrical 21 is aligned with the circular hole 131, the lens block 110 is placed on the base shell 20, allowing the square post to fit and insert into the open square slot 132. Compared to setting two closed holes (circular hole 32 and square hole), and then requiring the cylindrical and square posts to be accurately aligned with the circular hole 32 and square hole respectively for installation, the open square slot 132 design significantly improves the assembly efficiency of the lens block 110.

[0049] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A micro / nano lens structure, characterized in that, include: A lens block, the surface of which is provided with a plurality of integrally structured protrusions, the protrusions being constructed as at least one of cylindrical, V-shaped, conical, ellipsoidal, and irregular freeform surfaces, and the protrusions being distributed at equal or non-equal intervals.

2. The micro / nano lens structure according to claim 1, characterized in that, The width / diameter of the protrusion is 1μm to 50μm.

3. The micro / nano lens structure according to claim 1, characterized in that, The height of the protrusion is 0.5μm to 20μm.

4. The micro / nano lens structure according to claim 1, characterized in that, The distance between any two adjacent protrusions is 2μm to 100μm.

5. The micro / nano lens structure according to claim 1, characterized in that, Both the lens block and the protrusion are made of PC material.

6. The micro / nano lens structure according to claim 1, characterized in that, The cylindrical surface can be either a cylindrical surface or a non-cylindrical surface.

7. The micro / nano lens structure according to claim 1, characterized in that, The protrusion is spherical.

8. The micro / nano lens structure according to claim 1, characterized in that, The conical surface is one of a circular conical surface, an elliptical conical surface, or a pyramidal surface.

9. The micro / nano lens structure according to claim 8, characterized in that, The conical surface is either a regular conical surface or an oblique conical surface.

10. A PHUD backlight module, characterized in that, The micro / nano lens structure according to any one of claims 1 to 9 further includes a bottom shell and a lamp plate. The bottom shell has an inner cavity, and the lamp plate is disposed on the inner bottom wall of the inner cavity. The bottom shell is provided with a positioning post at each of the opposite ends of the inner cavity, and the lens block is provided with a positioning part at each of the opposite ends. When the lens block is fastened to the opening of the inner cavity, the two positioning posts are respectively inserted into the two positioning parts.

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