Variable focal microlens array projection device

Abstract

The utility model discloses a kind of variable focus microlens array projection devices, including light source, projection plane and the microlens array module arranged between light source and projection plane, microlens array module includes field lens array, projection source, projection lens array sequentially arranged along light propagation direction, zoom lens is set between microlens array module and projection plane, zoom lens is the flexible zoom lens of force-induced deformation drive zoom lens or electro-induced deformation drive.The microlens array projection device can compensate MLA defocus of non-design plane by setting zoom lens, so that when projecting to non-design plane, the appropriate focal length of zoom lens is adjusted, so that the projection pattern is kept clear.

Description

Technical Field

[0001] This utility model relates to a microlens array projection device. Background Technology

[0002] A microlens array (MLA) is a group of precisely manufactured miniature lens modules. Its optical principle is based on a combination of illumination optics and projection optics. First, light emitted from a light source is projected onto a field lens array, and then converges at the focal plane of the projection lens array. At the focal plane is a projection source with numerous micro-apertures that allow light to pass through, projecting distinct light patterns with varying brightness. Microlens arrays are widely used in projection devices, such as projection displays and automotive lights.

[0003] Existing microlens array projection devices are designed for a fixed plane (projection distance). When projected onto a different plane, rather than the designed plane, the projected pattern will become blurred due to defocus. Summary of the Invention

[0004] Purpose of the utility model: The purpose of this utility model is to provide a variable focus microlens array projection device, which enables the projected pattern to remain clear when projected onto a non-designed plane by adjusting the lens focal length.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A variable-focus microlens array projection device includes a light source, a projection plane, and a microlens array module arranged between the light source and the projection plane. The microlens array module includes a field lens array, a projection source, and a projection lens array arranged sequentially along the light propagation direction. The device is characterized in that a variable-focus lens is disposed between the microlens array module and the projection plane.

[0006] Furthermore, the zoom lens is a force-induced deformation driven zoom lens or an electro-induced deformation driven flexible zoom lens.

[0007] Furthermore, the focal length of the zoom lens is from negative infinity to -200mm or from positive infinity to 200mm.

[0008] Furthermore, the zoom lens is composed of a concave lens and a convex lens.

[0009] Furthermore, the microlens array module also includes a collimating microlens array disposed on the side of the field lens array facing the light source.

[0010] Furthermore, the collimating microlens array is one or more layers, and the multi-layer collimating microlens array is arranged sequentially along the direction of light propagation. The multi-layer collimating microlens array is made of different materials and has different refractive indices and dispersion coefficients.

[0011] Furthermore, a spacer layer is provided between the collimating microlens array and the light source.

[0012] Furthermore, the microlens array module also includes a prism array disposed on the side of the projection mirror array facing the projection plane.

[0013] Furthermore, the prism array is one or more layers, with multiple layers arranged sequentially along the direction of light propagation. The multiple layers are made of different materials and have different refractive indices and dispersion coefficients.

[0014] Beneficial effects: This microlens array projection device can compensate for MLA defocusing at non-designed planes (distances) by setting up a zoom lens, so that when projecting onto a non-designed projection plane, the projection pattern can be kept clear by adjusting the appropriate focal length of the zoom lens. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a variable focus microlens array projection device.

[0016] Figure 2 This is a schematic diagram of the collimating microlens array arrangement.

[0017] Figure 3 This is a schematic diagram of the spacing layer arrangement.

[0018] Figure 4 This is a schematic diagram of the prism array arrangement.

[0019] In the diagram: 1-Light source; 2-Field lens array; 3-Projection source; 4-Transparent substrate one; 5-Projection lens array; 6-Zoom lens; 7-Projection plane; 8-Collimating microlens array; 9-Transparent substrate two; 10-Spacer layer; 11-Prism array; 12-Transparent substrate three. Detailed Implementation

[0020] The present invention will be further explained below with reference to the accompanying drawings.

[0021] like Figure 1 As shown, the present invention provides a variable focus microlens array projection device, including a light source 1, a projection plane 7, and a microlens array module arranged between the light source 1 and the projection plane 7. The microlens array module includes a field lens array 2, a projection source 3, a projection lens array 5 arranged sequentially along the light propagation direction, and a transparent substrate 4 for supporting the field lens array 2, the projection source 3, and the projection lens array 5. A variable focus lens is provided between the microlens array module and the projection plane.

[0022] The sub-field mirrors of the field mirror array 2, the sub-projection sources of the projection source 3, and the sub-projection mirrors of the projection mirror array 5 together form a sub-optical projection channel. The light source 1 includes multiple LEDs corresponding to each sub-optical projection channel. The light emitted by each sub-LED is focused by the sub-field mirror of the corresponding sub-optical projection channel onto the corresponding sub-projection source. The light passing through each sub-projection source is imaged by the corresponding sub-projection mirror, and finally a sub-projection pattern is formed on the projection plane. The projection sources of different sub-optical projection channels form their own projection patterns on the projection plane. The projection patterns are spliced ​​together, partially overlapped or completely overlapped to form a complete soft shadow pattern.

[0023] The zoom lens 6 is a force-induced deformation-driven or electro-induced deformation-driven flexible zoom lens. The focal length of the zoom lens 6 is from negative infinity to -200mm or from positive infinity to 200mm. In this embodiment, the zoom lens 6 is composed of a concave lens and a convex lens, wherein the focal length of the concave lens is -70mm, the focal length of the convex lens is 81mm, and the spacing between the concave and convex lenses is adjustable from 10mm to 15mm. By adjusting the spacing, the focal length of the combined zoom lens can be varied from negative infinity to -200mm. When the position of the projection plane 7 changes, adjusting the appropriate focal length of the zoom lens can compensate for the defocus caused by the change in the position of the projection plane 7, thus keeping the projected image clear.

[0024] like Figure 2 As shown, the microlens array module also includes a collimating microlens array 8 disposed on the side of the field lens array 2 facing the light source 1. The collimating microlens array 8 includes multiple sub-collimating lenses corresponding to each sub-optical projection channel. Each sub-collimating lens collimates the light rays within each sub-optical projection channel, thereby reducing the deflection angle of the light rays within the sub-optical projection channel. The collimating microlens array 8 can be configured as one layer or multiple layers, such as... Figure 2 As shown, two collimating lens arrays 8 are arranged sequentially along the direction of light propagation and fixed on both sides of the transparent substrate 9. The two collimating microlens arrays 8 are made of different materials and have different refractive indices and different dispersion coefficients.

[0025] like Figure 3 As shown, a spacer layer 10 is provided between the light source 1 and the collimating microlens array. The spacer layer 10 is made of a light-absorbing material and is used to prevent light crosstalk between adjacent sub-optical projection channels.

[0026] like Figure 4As shown, the microlens array module also includes a prism array 11 disposed on the side of the projection mirror array 5 facing the projection plane 7. The prism array 11 is fixed on the transparent substrate 12. The prism array 11 includes multiple sub-prisms corresponding to each sub-optical projection channel. By configuring each sub-prism to specifically deflect the light from its corresponding sub-optical projection channel, the projection patterns formed by each sub-projection source of the microlens array module on the projection plane completely overlap, partially overlap, or are spliced ​​together to form the complete projection pattern of the microlens array projection module. The prism array can be one or more layers, with multiple prism arrays arranged sequentially along the direction of light propagation. The multiple prism arrays are made of different materials and have different refractive indices and dispersion coefficients.

[0027] When the collimating lens array 4 and prism array 11 mentioned above are set up in a multi-layer structure, the color difference of different materials and the surface shape of different curved surfaces are used to compensate for each other, so as to achieve the effect of eliminating color difference.

[0028] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A variable-focus microlens array projection device, comprising a light source, a projection plane, and a microlens array module arranged between the light source and the projection plane, wherein the microlens array module comprises a field lens array, a projection source, and a projection mirror array arranged sequentially along the light propagation direction, characterized in that: A zoom lens is disposed between the microlens array module and the projection plane.

2. The variable focus microlens array projection device according to claim 1, characterized in that: The zoom lens is a force-induced deformation driven zoom lens or an electro-induced deformation driven flexible zoom lens.

3. The variable focus microlens array projection device according to claim 2, characterized in that: The focal length of the zoom lens is from negative infinity to -200mm or from positive infinity to 200mm.

4. The variable focus microlens array projection device according to claim 3, characterized in that: The zoom lens is composed of a concave lens and a convex lens.

5. The variable focus microlens array projection device according to claim 1, characterized in that: The microlens array module also includes a collimating microlens array disposed on the side of the field lens array facing the light source.

6. A variable focus microlens array projection device according to claim 5, characterized in that: The collimating microlens array is one or more layers, and the multi-layer collimating microlens array is arranged sequentially along the direction of light propagation. The multi-layer collimating microlens array is made of different materials and has different refractive indices and dispersion coefficients.

7. A variable focus microlens array projection device according to claim 5, characterized in that: A spacer layer is provided between the collimating microlens array and the light source.

8. The variable focus microlens array projection device according to claim 1, characterized in that: The microlens array module also includes a prism array disposed on the side of the projection mirror array facing the projection plane.

9. A variable focus microlens array projection device according to claim 8, characterized in that: The prism array is one or more layers, with multiple prism arrays arranged sequentially along the direction of light propagation. The multiple prism arrays are made of different materials and have different refractive indices and dispersion coefficients.

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