CN215729253U

CN215729253U - Micro-lens array projection device based on LED array

Info

Publication number: CN215729253U
Application number: CN202121979358.5U
Authority: CN
Inventors: 沈宝良; 申建雷; 黄伟; 李凡月
Original assignee: Shihu Technology Nanjing Co ltd
Current assignee: Shihu Technology Nanjing Co ltd
Priority date: 2021-08-23
Filing date: 2021-08-23
Publication date: 2022-02-01
Anticipated expiration: 2031-08-23

Abstract

The utility model discloses a micro-lens array projection device based on an LED array, which comprises a light source and a micro-lens array module, wherein the light source comprises an LED array layer consisting of a plurality of sub-LEDs, a first spacing layer is arranged between the sub-LEDs, the micro-lens array module comprises a first micro-lens array group, a second spacing layer and a second micro-lens array group, the first micro-lens array group comprises a collimation micro-lens array, the second micro-lens array group comprises a light-gathering micro-lens array, an image array and a projection micro-lens array, each sub-collimation micro-lens of the collimation micro-lens array, each sub-light-gathering micro-lens of the light-gathering micro-lens array, each sub-image of the image array, each sub-projection micro-lens of the projection micro-lens array and each sub-LED of the LED array layer correspond to a common sub-optical projection channel one by one, and light rays emitted by each sub-LED only pass through the corresponding sub-optical projection channel, the projection device can realize color patterns and horse race lamp type pattern transformation.

Description

Micro-lens array projection device based on LED array

Technical Field

The utility model relates to a micro-lens array projection device based on an LED array.

Background

The micro lens array is an array composed of lenses with micron-sized clear aperture and relief depth. The lens is the same as the traditional lens, the minimum functional unit can be a spherical mirror, an aspherical mirror, a cylindrical lens, a prism and the like, the functions of focusing, imaging, light beam conversion and the like can be realized at a micro-optical angle, and because the unit size is small and the integration level is high, the lens can form a plurality of novel optical systems to complete the functions which cannot be completed by the traditional optical element.

The existing micro-lens array projection device can only project a fixed pattern, and the pattern can only be monochromatic.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims to provide a micro-lens array projection device based on an LED array, which adopts the LED array as a light source and can realize color patterns and horse race lamp type pattern conversion.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a micro-lens array projection device based on an LED array comprises a light source and a micro-lens array module, wherein the light source comprises an LED array layer and a first spacing layer, the LED array layer is composed of a plurality of sub-LEDs with the same color or different colors, the first spacing layer is arranged among the sub-LEDs at intervals, the micro-lens array module comprises a first micro-lens array group, a second spacing layer and a second micro-lens array group which are sequentially arranged along the light propagation direction, the first micro-lens array group comprises a collimation micro-lens array, the second micro-lens array group comprises a light-gathering micro-lens array, an image array and a projection micro-lens array, each sub-collimation micro-lens of the collimation micro-lens array, each sub-light-gathering micro-lens of the light-gathering micro-lens array, each sub-image of the image array, each sub-projection micro-lens of the projection micro-lens array and each sub-LED of the LED array layer are in one-to one correspondence, the sub collimating micro-lenses, the sub condensing micro-lenses, the sub-images and the sub projecting micro-lenses which correspond to each other form sub optical projecting channels which correspond to the sub-LEDs one by one, light rays emitted by each sub-LED only pass through the corresponding sub optical projecting channel under the action of the first spacing layer and the second spacing layer, the diopters of the sub condensing micro-lenses are configured to enable the light rays passing through the sub condensing micro-lenses to only pass through the corresponding sub-images and the sub projecting micro-lenses in sequence, after the light rays passing through the sub-images are focused by the sub projecting micro-lenses, images of the sub-images are formed at the imaging positions, and the images of all the sub-images at the imaging positions are combined into a complete pattern to be projected.

Further, each sub-collimating microlens of the collimating microlens array is divided into a front collimating microlens and a rear collimating microlens.

Further, the first microlens array set further includes a first spacer substrate, and the first spacer substrate is located between the front collimating microlens and the rear collimating microlens.

Further, the second microlens array set further includes a second spacer substrate, and the second spacer substrate is located between the image array and the projection microlens array.

Further, the LED array layer and the first spacing layer are fixedly connected to the packaging substrate.

Has the advantages that: the light source of the projection device adopts the LED arrays with the same color or different colors, and the color patterns and the horse race lamp type pattern conversion can be realized by controlling the on-off state, the luminous brightness and the time sequence of different sub-LEDs.

Drawings

FIG. 1 is a schematic structural diagram of a micro-lens array projection apparatus based on an LED array according to the present invention.

In the figure: 1-a package substrate; 2-sub LED; 3-a first spacer layer; 4-a front collimating micro lens; 5-a first spacer substrate; 6-post collimating micro lens; 7-a second spacer layer; 8-sub condensing micro lens; 9-sub-image; 10-a second spacer substrate; 11-sub projection microlens.

The specific implementation mode is as follows:

the utility model is further explained below with reference to the drawings.

As shown in fig. 1, a microlens array projection apparatus based on LED array of the present invention includes a light source and a microlens array module.

The light source comprises an LED array layer and a first spacer layer 3 affixed to a package substrate 1. The LED array layer is composed of a plurality of sub-LEDs 2 of the same color or different colors, and the first spacer layer 3 is disposed at intervals between the sub-LEDs 2. The sub-LEDs 2 are connected to the LED control circuit, and the LED control circuit can control the switches of all the sub-LEDs 2 in a unified manner, or can control the switches of each sub-LED 2 individually.

The micro-lens array module comprises a first micro-lens array group, a second spacing layer 7 and a second micro-lens array group which are sequentially arranged along the light propagation direction. The first micro lens array group comprises a collimation micro lens array, the second micro lens array group comprises a condensation micro lens array, an image array and a projection micro lens array, each sub-collimation micro lens of the collimation micro lens array, each sub-condensation micro lens 8 of the condensation micro lens array, each sub-image 9 of the image array and each sub-projection micro lens 11 of the projection micro lens array correspond to each sub-LED 2 of the LED array layer in a one-to-one mode, the sub-collimation micro lens, the sub-condensation micro lens 8, the sub-image 9 and the sub-projection micro lens 11 which correspond to each other jointly form sub-optical projection channels which correspond to the sub-LEDs in the one-to-one mode, and light rays emitted by each sub-LED 2 only pass through the corresponding sub-optical projection channels under the action of the first spacing layer 3 and the second spacing layer 7.

In the embodiment, each sub-collimating microlens of the collimating microlens array is divided into a front collimating microlens 4 and a rear collimating microlens 6, the front collimating microlens 4 is used for reducing the deflection angle of the light in the sub-optical projection channel, and the rear collimating microlens 6 is used for further reducing the deflection angle of the light on the basis of the action of the front collimating microlens 4. The first microlens array set further includes a first spacer substrate 5, the first spacer substrate 5 being positioned between the front collimating microlens 4 and the rear collimating microlens 6, the front collimating microlens 4 and the rear collimating microlens 6 being maintained at a designed distance by the first spacer substrate 5.

The diopter of the sub-condenser micro-lens 8 is configured to make the light passing through the sub-condenser micro-lens 8 only pass through the corresponding sub-image 9 and the sub-projection micro-lens 11 in sequence, the light passing through the sub-image 9 is focused by the sub-projection micro-lens 11, the image of the sub-image is formed at the imaging position, and the images of all the sub-images at the imaging position are combined into a complete pattern to be projected. The second microlens array set further includes a second spacer substrate 10. A second spacer substrate 10 is positioned between the image array and the projection microlens array, and the designed distance is maintained between each sub-image 9 and the sub-projection microlens 11 by the second spacer substrate 10.

When the projection device works, if the LED array layer is formed by the sub-LEDs with the same color, the horse race lamp type pattern conversion can be realized by controlling the on-off state, the luminous brightness and the time sequence of the different sub-LEDs. If the LED array layer is formed by sub-LEDs with different colors, such as a blue LED and a yellow LED, the luminous intensity of the blue sub-LED and the luminous intensity of the yellow sub-LED are respectively adjusted, and the sub-blue LED and the sub-yellow LED are configured to illuminate to the same position, so that local patterns with different colors can be realized, and a plurality of local patterns with different colors form a complete color pattern.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a microlens array projection arrangement based on LED array, includes light source and microlens array module, its characterized in that: the light source comprises an LED array layer and a first spacing layer, the LED array layer is composed of a plurality of sub-LEDs with the same color or different colors, the first spacing layer is arranged among the sub-LEDs at intervals, the micro-lens array module comprises a first micro-lens array group, a second spacing layer and a second micro-lens array group which are sequentially arranged along the light propagation direction, the first micro-lens array group comprises a collimation micro-lens array, the second micro-lens array group comprises a light-gathering micro-lens array, an image array and a projection micro-lens array, each sub-collimation micro-lens of the collimation micro-lens array, each sub-light-gathering micro-lens of the light-gathering micro-lens array, each sub-image of the image array, each sub-projection micro-lens of the projection micro-lens array and each sub-LED of the LED array layer are in one-to-one correspondence, and the sub-collimation micro-lens, the sub-light-gathering micro-lens, the sub-image and the sub-projection micro-lens which are mutually corresponding form sub-optical projection channels which are in one-to-correspondence with the sub-LEDs, the light emitted by each sub LED only passes through the corresponding sub optical projection channel under the action of the first spacing layer and the second spacing layer, the diopter of the sub light-gathering micro lens is configured to enable the light passing through the sub light-gathering micro lens to only sequentially pass through the corresponding sub image and the sub projection micro lens, the light passing through the sub image is focused by the sub projection micro lens to form an image of the sub image at the imaging position, and the images of all the sub images at the imaging position are combined into a complete pattern to be projected.

2. A LED array based microlens array projection apparatus as claimed in claim 1, wherein: each sub-collimating micro-lens of the collimating micro-lens array is divided into a front collimating micro-lens and a rear collimating micro-lens.

3. An LED array-based microlens array projection apparatus as claimed in claim 2, wherein: the first microlens array set further includes a first spacer substrate positioned between the front collimating microlens and the rear collimating microlens.

4. A LED array based microlens array projection apparatus as claimed in claim 1, wherein: the second microlens array set further includes a second spacer substrate positioned between the image array and the projection microlens array.

5. A LED array based microlens array projection apparatus as claimed in claim 1, wherein: the LED array layer and the first spacing layer are fixedly connected to the packaging substrate.