Directional dodging sheet

Abstract

The utility model provides a directional dodging sheet which comprises a thin film structure layer, the thin film structure layer is arranged on the surface of one side far away from a thin film layer body, and a plurality of rectangular holes are formed in the top of the thin film structure layer. The light equalizing plate is reasonable in design, the substrate provides a setting basis for the thin film layer body and the thin film structure layer, the use reliability of the thin film structure layer is improved, meanwhile, the structural stability of the light equalizing plate is guaranteed, light is diffused to a required angle after passing through the thin film structure layer and then is emitted, and the light equalizing effect is improved. 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 uniformity sheet, concretely relates to a directional light uniformity sheet. BACKGROUND

[0002] Light uniformity sheet has important application in many fields, including LED lighting, image amplification, sensors, TOF, etc. Especially in vehicle-mounted optics, it has important application value. Head-up display (HUD) is originally applied to carrier-based aircraft, also known as head-up display system. With the rapid development of automobile industry, head-up display (HUD) is applied to vehicle-mounted optical system, projects automobile driving information and navigation information on windshield, and forms virtual image in front of driver. Driver can take into account instrument parameters and external visual reference without looking down, reduces the frequency of driver looking down to read instrument, and thus improves driving safety.

[0003] In the image generation unit (PGU) of HUD, light uniformity sheet plays the function of homogenizing light field intensity and amplifying image. With the continuous development of HUD, the fusion requirement of navigation information and real environment is higher, therefore, HUD needs larger virtual image distance (VID) and larger field of view angle (FOV). For AR-HUD, VID>7.5m and FOV>10°×3° are generally required.

[0004] The inventor found the following defects in the specific embodiment operation process:

[0005] When the light beam passes through the light uniformity sheet, the light intensity distribution is prone to unevenness, and when the large angle is taken into account, the light field passing through the light uniformity sheet is also prone to distortion.

[0006] It should be noted that the above content belongs to the technical cognition range of the inventor. Since the technical content in the art is vast and complex, the above content of the present application does not necessarily constitute the prior art. CONTENT OF THE UTILITY MODEL

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

[0008] The utility model provides a directional light uniformity sheet to solve the technical problems in the above background technology.

[0009] 2. Technical scheme:

[0010] In order to achieve the above purpose, the technical scheme provided by the utility model is as follows: a directional light uniformity sheet, comprising a directional light uniformity sheet body, which comprises a substrate;

[0011] A thin film layer body is arranged on the side surface away from the substrate;

[0012] A film structure layer is arranged on the surface of the film layer body, and a plurality of rectangular holes are arranged on the top of the film structure layer.

[0013] Further, the substrate thickness is 1000um-5000um, and the substrate refractive index is 1.4-1.6.

[0014] Further, the film layer body thickness is 0.5um-5um, and the film layer body refractive index is 1.8-2.6.

[0015] Further, the rectangular holes on the top of the film structure layer are equidistantly distributed on the top of the film structure layer.

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

[0017] Further, the rectangular hole surface type is a free curved surface.

[0018] Further, the background light source and the light field receiving surface are further included, the background light source is arranged at the bottom of the directional light uniformization sheet body, the background light source is spaced apart from the directional light uniformization sheet body by a certain distance, the background light source is located on one side of the substrate, and the light field receiving surface is arranged directly above the directional light uniformization sheet body.

[0019] 3. Beneficial effects:

[0020] Compared with the prior art, the technical scheme has the following beneficial effects:

[0021] The substrate provides a setting basis for the film layer body and the film structure layer, improves the use reliability of the film structure layer, ensures the structural stability of the light uniformization sheet, diffuses the light after the light passes through the film structure layer, emits at a required angle, obtains uniform light spots on the light field receiving surface, and ensures the uniformity of the final imaging.

[0022] By reasonably designing the arrangement mode, shape and height of the plurality of rectangular holes on the film structure layer, the divergence angle and uniformity of the light field light spot can be improved, and smaller distortion is obtained under a larger divergence angle.

[0023] The collimated light is vertically incident on the substrate of the light uniformization sheet, is incident on the film layer body after passing through the substrate, is diffused into a specified field of view angle range due to the refraction, diffraction and scattering of the rectangular holes arranged on the film layer on the light beam. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1The utility model discloses a front view structural schematic diagram.

[0025] Figure 2 The utility model discloses a directional homogenizing piece body three-dimensional structure schematic diagram.

[0026] Figure 3 It is the spot distribution diagram of the utility model.

[0027] Reference signs:

[0028] 1, background light source; 2, directional homogenizing piece body; 21, base; 22, film layer body; 23, film structure layer; 3, light field receiving surface. DETAILED DESCRIPTION

[0029] In order to facilitate understanding the utility model, the utility model will be described more fully below with reference to the relevant drawings, the drawings show several embodiments of the utility model, however, the utility model can be realized 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 utility model more thorough and comprehensive.

[0030] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "page", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0031] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0032] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix", "have", "set" and so on terms should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connect, can be mechanical connection, also can be electric connection, can be direct connection, also can indirectly connect through intermediate medium, can be two element internal communication. For ordinary skilled in the art, can understand the above terms in the utility model specific meaning according to specific circumstances. Embodiment

[0033] Refer to the attached Figure 1-3 A directional light uniformity sheet, comprising a directional light uniformity sheet body 2, which comprises a substrate 21;

[0034] A film layer body 22 is arranged on the side surface away from the substrate 21;

[0035] A film structure layer 23 is arranged on the surface away from the film layer body 22, and the top of the film structure layer 23 is provided with a plurality of rectangular holes.

[0036] Further, the thickness of the substrate 21 is 1000um-5000um, and the refractive index of the substrate 21 is between 1.4 and 1.6.

[0037] Further, the thickness of the film layer body 22 is 0.5um-5um, and the refractive index of the film layer body 22 is between 1.8 and 2.6.

[0038] Further, the rectangular holes on the top of the film structure layer 23 are distributed equidistantly on the top of the film structure layer 23.

[0039] Further, 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.

[0040] Further, the rectangular hole surface type is a free curved surface.

[0041] Further, it also comprises a background light source 1 and a light field receiving surface 3, the background light source 1 is arranged at the bottom of the directional light uniformity sheet body 2, the background light source 1 and the directional light uniformity sheet body 2 are spaced apart by a certain distance, 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 uniformity sheet body 2.

[0042] The substrate 21 provides a foundation for the thin film layer body 22 and the thin film structure layer 23, which helps improve the reliability of the thin film structure layer 23 and ensures the structural stability of the light homogenizer. After passing through the thin film structure layer 23, the light is diffused and emitted at the required angle, resulting in a uniform light spot on the light field receiving surface 3, ensuring the uniformity of the final imaging.

[0043] By rationally designing the arrangement, shape, and height of the plurality of rectangular holes on the thin film structure layer 23, the divergence angle and uniformity of the light field spot can be improved, and at a larger divergence angle, there is less distortion.

[0044] The collimated light is vertically incident on the base 21 of the light homogenizer, and after passing through the base 21, it is incident on the film layer body 22. Due to the refraction, diffraction and scattering of the light beam by the rectangular holes arranged on the film layer, the collimated light beam is diverged into the specified field of view angle range.

[0045] 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 based on the angles at which light rays need to extend in the X and Y directions to achieve the design goal. The above is the calculation formula for the rectangular hole at the top of the thin film structure layer 23.

[0046] .

[0047] like Figure 3 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 60°×15°. At this diffusion angle, the light spot shows good uniformity, and at this diffusion angle, the light spot distortion is effectively suppressed.

[0048] 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 directional light-dispersing sheet, characterized in that: include A directional light-homogenizing sheet body (2), comprising a base (21); a thin film layer body (22), the thin film layer body (22) being arranged on a surface on a side away from the substrate (21); A thin film structure layer (23), the thin film structure layer (23) being arranged on a surface on a side away from the thin film layer body (22), and a plurality of rectangular holes being arranged on a top of the thin film structure layer (23); A background light source (1) and a light field receiving surface (3), wherein the background light source (1) is arranged at the bottom of a directional light homogenizing sheet body (2), 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 a base (21), and a light field receiving surface (3) is arranged directly above the directional light homogenizing sheet body (2).

2. The directional light homogenizer 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 directional light homogenizer according to claim 1, characterized in that: The film layer body (22) has a thickness of 0.5um-5um, and a refractive index of the film layer body (22) is between 1.8 and 2.

6.

4. The directional light homogenizer according to claim 1, characterized in that: The rectangular holes on the top of the thin film structure layer (23) are distributed at equal intervals on the top of the thin film structure layer (23).

5. The directional light homogenizing sheet according to claim 4, 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.

6. The directional light homogenizing sheet according to claim 4, characterized in that: The rectangular hole surface is a free-form surface.

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