Large-angle directional dodging sheet

Abstract

The utility model provides a wide-angle directional dodging sheet, which comprises a rectangular microlens array layer, the rectangular microlens array layer is arranged on the surface of one side far away from a substrate, the rectangular microlens array layer is composed of a plurality of rectangular microlenses, and the microlenses have deformed aspheric surface types. The directional dodging sheet is reasonable in design, the substrate provides a setting basis for the rectangular microlens array layer, the film layer and the film structure layer, the use reliability of the rectangular microlens array layer and the film layer is improved, meanwhile, the overall structural stability of the directional dodging sheet body is guaranteed, and the directional dodging sheet is convenient to use. A light beam emitted by the background light source is diffused after passing through the thin film structure layer and is emitted at a required angle, uniform light spots are obtained on a light field receiving surface, and the uniformity of final imaging is ensured.

Description

Technical Field

[0001] The utility model mainly relates to the field of light homogenizers, and in particular to a large-angle directional light homogenizer. Background Art

[0002] Light diffusers have important applications in many fields, including LED lighting, image amplification, sensors, and time-of-flight (TOF). They are particularly valuable in automotive optics. Head-up displays (HUDs), also known as head-up displays (HUDs), were originally used on carrier-based aircraft. With the rapid development of the automotive industry, HUDs have been incorporated into automotive optical systems, projecting driving and navigation information onto the windshield, creating a virtual image in front of the driver. This allows the driver to maintain a balanced view of instrument parameters and external visual references without looking down, reducing the need to glance down at the instruments and improving driving safety.

[0003] In the HUD's picture generation unit (PGU), a diffuser homogenizes the light field intensity and amplifies the image. With the continuous development of HUDs, the requirements for integrating navigation information with the real environment are becoming more stringent. Consequently, HUDs require a larger virtual image distance (VID) and a larger field of view (FOV). For AR-HUDs, VID > 7.5m and FOV > 10° × 3° are generally required.

[0004] During the operation of the specific embodiment, the inventors found the following defects:

[0005] It is difficult to expand the light beam to a large angle with the existing technology, and when the light beam passes through the light homogenizer, the light intensity distribution is prone to unevenness. When taking into account the large angle, the light field passing through the light homogenizer is also prone to distortion.

[0006] It should be noted that the above content belongs to the technical knowledge scope of the inventor. Since the technical content in this field is vast and too complicated, the above content of this application does not necessarily constitute prior art. Utility Model Content

[0007] 1. Technical problems to be solved by the utility model:

[0008] The utility model provides a large-angle directional light homogenizer to solve the technical problems existing in the above-mentioned background technology.

[0009] 2. Technical solution:

[0010] To achieve the above-mentioned purpose, the technical solution provided by the present invention is as follows: a large-angle directional light homogenizer, comprising a directional light homogenizer body, which includes a substrate, a rectangular microlens array layer, a thin film layer and a thin film structure layer;

[0011] a rectangular microlens array layer, the rectangular microlens array layer being disposed on a surface away from the substrate, the rectangular microlens array layer being composed of a plurality of rectangular microlenses, each of the microlenses having a deformed aspheric surface;

[0012] a thin film layer, the thin film layer being disposed on top of the rectangular microlens array layer and being tightly connected to the rectangular microlens array layer;

[0013] The thin film structure layer is arranged on a surface away from the thin film layer. A plurality of rectangular holes are opened on the top of the thin film structure layer. The side of these rectangular holes close to the rectangular microlens array layer is a deformed aspheric surface.

[0014] Furthermore, the substrate thickness is 1000um-5000um, and the substrate refractive index is between 1.4 and 1.6.

[0015] Furthermore, the length of the rectangular microlens array layer is 10um-100um; the width of the rectangular microlens array layer is 10um-100um; and the depth of the rectangular microlens array layer is 0.1um-5um.

[0016] Furthermore, the length of the rectangular hole is 10um-100um; the width of the rectangular hole is 10um-100um; and the depth of the rectangular hole is 0.1um-5um.

[0017] Furthermore, the rectangular hole surface is a free-form surface.

[0018] Furthermore, the invention also includes a background light source and a light field receiving surface. The background light source is arranged at the bottom of the directional light homogenizing sheet body. There is a certain distance between the background light source and the directional light homogenizing sheet body. The background light source is located on one side of the base. A light field receiving surface is arranged directly above the directional light homogenizing sheet body.

[0019] 3.Beneficial effects:

[0020] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects:

[0021] The utility model provides a substrate for the rectangular microlens array layer, the thin film layer, and the thin film structure layer, thereby improving the reliability of the rectangular microlens array layer and the thin film layer, while ensuring the overall structural stability of the directional light homogenizing sheet. The light beam emitted by the background light source is diffused after passing through the thin film structure layer and is emitted at a desired angle, thereby obtaining a uniform light spot on the light field receiving surface and ensuring the uniformity of the final imaging.

[0022] By rationally designing the arrangement, shape, and height of multiple microlenses on the rectangular microlens array layer and multiple rectangular holes on the thin film layer, the divergence angle and uniformity of the light field spot can be improved, with smaller distortion at larger divergence angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the three-dimensional structure of the directional light-dispersing sheet body of the present utility model;

[0025] Figure 3 This is a schematic diagram of the three-dimensional structure of the directional light-dispersing sheet body of the present utility model;

[0026] Figure 4 This is the spot distribution diagram of the present utility model.

[0027] Reference numerals:

[0028] 1. Background light source; 2. Directional light homogenizing sheet body; 21. Substrate; 22. Rectangular microlens array layer; 23. Thin film layer; 24. Thin film structure layer; 3. Light field receiving surface. DETAILED DESCRIPTION

[0029] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0032] In this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," "provided with," "provided on," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on specific circumstances. Example

[0033] Refer to the attached Figure 1-4 A large-angle directional light homogenizer includes a directional light homogenizer body 2, which includes a substrate 21, a rectangular microlens array layer 22, a thin film layer 23 and a thin film structure layer 24;

[0034] a rectangular microlens array layer 22, the rectangular microlens array layer 22 being disposed on a surface away from the substrate 21, the rectangular microlens array layer 22 being composed of a plurality of rectangular microlenses, each of the microlenses having a deformed aspheric surface;

[0035] a thin film layer 23 , which is disposed on top of the rectangular microlens array layer 22 and is tightly connected to the rectangular microlens array layer 22 ;

[0036] The thin film structure layer 24 is arranged on the surface away from the thin film layer 23. A plurality of rectangular holes are opened on the top of the thin film structure layer 24. The side of these rectangular holes close to the rectangular microlens array layer 22 is a deformed aspheric surface.

[0037] Furthermore, the thickness of the substrate 21 is 1000um-5000um, the refractive index of the substrate 21 is between 1.4 and 1.6, the length of the rectangular microlens array layer 22 is between 10um-100um; the width of the rectangular microlens array layer 22 is between 10um-100um; the depth of the rectangular microlens array layer 22 is between 0.1um-5um, and the rectangular microlens array layer 22 includes a plurality of microlenses, the sizes of the microlenses are the same or different, and the microlenses are periodically distributed or non-periodically distributed.

[0038] Furthermore, the length of the rectangular hole is 10um-100um; the width of the rectangular hole is 10um-100um; the depth of the rectangular hole is 0.1um-5um, the surface of the rectangular hole is a free-form surface, the thin film structure layer 24 contains rectangular holes of the same or different sizes, and the rectangular holes are periodically distributed or non-periodically distributed.

[0039] Furthermore, the device further includes a background light source 1 and a light field receiving surface 3, wherein the background light source 1 is arranged at the bottom of the directional light homogenizing sheet body 2, and a certain distance is separated between the background light source 1 and the directional light homogenizing sheet body 2. The background light source 1 is located on one side of the substrate 21, and the light field receiving surface 3 is arranged directly above the directional light homogenizing sheet body 2;

[0040] like Figure 1 As shown, the substrate 21 provides a foundation for the rectangular microlens array layer 22, the thin film layer 23, and the thin film structure layer 24, which is beneficial to improving the reliability of the rectangular microlens array layer 22 and the thin film layer 23, while ensuring the overall structural stability of the directional light homogenizing sheet body 2. The light beam emitted by the background light source 1 is diffused after passing through the thin film structure layer 24 and is emitted at the required angle, obtaining a uniform light spot on the light field receiving surface 3, ensuring the uniformity of the final imaging. By reasonably designing the arrangement, shape, and height of the multiple microlenses on the rectangular microlens array layer 22 and the multiple rectangular holes on the thin film layer 23, the divergence angle and uniformity of the light field spot can be improved, and at a larger divergence angle, smaller distortion is achieved.

[0041] like Figure 2 and Figure 3 As shown, the substrate 21 and the film layer 23 are distributed in different directions and sizes. The side of the rectangular microlens array layer 22 away from the substrate 21 has a deformed aspheric surface, and the side of the rectangular hole close to the film layer 23 has a deformed aspheric surface.

[0042] As shown in the figure below, Cx and Kx are the curvature and quadratic constant in the X direction, respectively; Cy and Ky are the curvature and quadratic constant in the Y direction, respectively. The deformable aspheric surface allows for independent control of the curvature and quadratic surface type in the X and Y directions. The curvature and surface type in the X and Y directions can be designed separately based on the angles that the light rays need to extend in the X and Y directions to achieve the design goal.

[0043]

[0044] Figure 4 As shown in the figure, the brightness angle distribution of the light beam after passing through the light homogenizer is shown. The light spot diffusion angle is set to 120°*20°. At this diffusion angle, the light spot shows good uniformity, and at this diffusion angle, the light spot distortion is effectively suppressed.

[0045] The above-mentioned embodiments only express a certain implementation method of the utility model, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, which all fall within the scope of protection of the utility model. Therefore, the scope of protection of the utility model patent shall be based on the attached claims.

Claims

1. A large-angle directional light diffuser, characterized by: It comprises a directional light homogenizing sheet body (2), which comprises a substrate (21), a rectangular microlens array layer (22), a thin film layer (23) and a thin film structure layer (24); a rectangular microlens array layer (22), the rectangular microlens array layer (22) being arranged on a surface away from the substrate (21), the rectangular microlens array layer (22) being composed of a plurality of rectangular microlenses, the microlenses having a deformed aspheric surface shape; a thin film layer (23), the thin film layer (23) being arranged on top of the rectangular microlens array layer (22), the thin film layer (23) being tightly connected to the rectangular microlens array layer (22); A thin film structure layer (24) is provided on a surface away from the thin film layer (23), a top of the thin film structure layer (24) is provided with a plurality of rectangular holes, and a side of the rectangular holes close to the rectangular microlens array layer (22) is a deformed aspheric surface.

2. The large-angle directional light diffuser according to claim 1, characterized in that: The thickness of the substrate (21) is 1000um-5000um, and the refractive index of the substrate (21) is between 1.4 and 1.

6.

3. The large-angle directional light diffuser according to claim 1, characterized in that: The rectangular microlens array layer (22) has a length of 10 um to 100 um; the rectangular microlens array layer (22) has a width of 10 um to 100 um; and the rectangular microlens array layer (22) has a depth of 0.1 um to 5 um.

4. The large-angle directional light diffuser according to claim 1, characterized in that: The length of the rectangular hole is 10um-100um; the width of the rectangular hole is 10um-100um; and the depth of the rectangular hole is 0.1um-5um.

5. The large-angle directional light diffuser according to claim 1, characterized in that: The rectangular hole surface is a free-form surface.

6. The large-angle directional light diffuser according to claim 1, characterized in that: The invention also includes a background light source (1) and a light field receiving surface (3), wherein the background light source (1) is arranged at the bottom of the directional light homogenizing sheet body (2), and a certain distance is separated from the background light source (1) and the directional light homogenizing sheet body (2). The background light source (1) is located on one side of the base (21), and the light field receiving surface (3) is arranged directly above the directional light homogenizing sheet body (2).

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