CN112802404A

CN112802404A - Micro LED display device and method thereof and Micro projection system

Info

Publication number: CN112802404A
Application number: CN201911103515.3A
Authority: CN
Inventors: 张倩; 王雁茹; 陈杭; 胡增新
Original assignee: Sunny Optical Zhejiang Research Institute Co Ltd
Current assignee: Sunny Optical Zhejiang Research Institute Co Ltd
Priority date: 2019-11-13
Filing date: 2019-11-13
Publication date: 2021-05-14

Abstract

A Micro LED display device, a method thereof and a Micro projection system. The Micro LED display device comprises a Micro LED array and a Micro collimation array. The Micro LED array includes: a circuit board; and a plurality of Micro LEDs, wherein the plurality of Micro LEDs are electrically energizable integrated on the circuit board and distributed in an array on the circuit board, wherein the Micro LEDs have a light emitting path for emitting a pixel beam along the light emitting path. The Micro-collimation array is correspondingly superposed on the Micro LED array and is used for collimating the pixel light beam emitted by the Micro LED array so as to reduce the divergence angle of the pixel light beam.

Description

Micro LED display device and method thereof and Micro projection system

Technical Field

The invention relates to the technical field of Micro display, in particular to a Micro LED display device, a Micro LED display method and a Micro projection system.

Background

In recent years, with the advent of LED technology and micro display chip technology, miniaturization and high-resolution projection display have become possible. With the continuous development of projection display technology and market demand, wearable micro projection light engines with large view field, high imaging quality and small volume are more and more emphasized, especially in the fields of development of Augmented Reality (AR), Near-eye display (NED), wearable and the like. However, the current near-eye display devices based on various projection technologies such as LCOS, LCD, DMD or OLED still have many disadvantages such as large size, high cost, heavy device, etc., which greatly limits the development of the near-eye display devices for consumers.

With the advent of Micro light emitting diode (hereinafter referred to as Micro LED) display technology, further miniaturization of near-eye display devices is possible. First, in the Micro LED display technology, a Micro-scale pitch LED array is formed by miniaturizing a conventional LED to achieve ultra-high density pixel resolution, that is, the Micro LED array is a high density integrated Micro-scale pitch LED array, and each LED in the array can be used as a pixel point and independently addressed and lighted. In other words, each LED pixel in the Micro LED array can self-emit light, and image display is further achieved by accurately controlling the light emitting intensity of each LED, that is, the Micro LED array can directly emit image light. Besides the characteristics of high brightness, ultrahigh resolution, color saturation and high luminous efficiency, the Micro LED is not influenced by water vapor, oxygen or high temperature, so that the Micro LED has obvious advantages in the aspects of stability, service life, working temperature and the like. In addition, the power consumption of Micro LEDs is about 10% of LCD and 50% of OLED; compared with the OLED, the brightness of the display is equivalent, and only about 10% of the coating area of the OLED is needed. In summary, the above advantages of Micro LED display technology determine that it will have wide application in Micro projection field, especially near-eye display, and augmented reality field.

However, the light beam emitted by each LED in the existing Micro LED array generally has a large divergence angle, and the light beam with a large angle not only reduces the light efficiency of the system, but also causes a stray light effect, and especially seriously affects the light efficiency and the imaging quality of the Micro LED-based Micro projection system.

Disclosure of Invention

An advantage of the present invention is to provide a Micro LED display device, a method thereof, and a Micro projection system, which can reduce a divergence angle of emergent light, and is beneficial to improving a system light effect and reducing a stray light effect.

Another advantage of the present invention is to provide a Micro LED display device, a method thereof, and a Micro projection system, wherein in an embodiment of the present invention, the Micro LED display device can perform Micro-collimation on the emergent light of the Micro LED array, which is helpful for improving the overall collimation effect.

Another advantage of the present invention is to provide a Micro LED display device, a method thereof and a Micro projection system, wherein in an embodiment of the present invention, the Micro LED display device can independently and effectively collimate each LED in a Micro LED array through a Micro collimation element in the Micro collimation array, which is helpful for achieving efficient collimation of the Micro LED array.

Another advantage of the present invention is to provide a Micro LED display device, a method thereof and a Micro projection system, wherein in an embodiment of the present invention, the Micro LED display device can improve the light energy utilization and image quality of the Micro projection system, and reduce light energy loss and stray light.

Another advantage of the present invention is to provide a Micro LED display device, a method thereof, and a Micro projection system, in which it is not necessary to use expensive materials or complicated structures in the present invention in order to achieve the above objects. Accordingly, the present invention successfully and effectively provides a solution to not only provide a simple Micro LED display device and method thereof and a Micro projection system, but also increase the practicality and reliability of the Micro LED display device and method thereof and the Micro projection system.

To achieve at least one of the above advantages or other advantages and objects, the present invention provides a Micro LED display device, including:

an array of Micro LEDs, wherein the array of Micro LEDs comprises:

a circuit board; and

a plurality of Micro LEDs, wherein the plurality of Micro LEDs are galvanically integrated to the circuit board and distributed in an array on the circuit board, wherein the Micro LEDs have a light emitting path for emitting a pixel light beam along the light emitting path; and

a Micro-collimation array, wherein the Micro-collimation array is correspondingly superposed on the Micro LED array and is used for collimating pixel beams emitted by the Micro LED.

In an embodiment of the present invention, the Micro-collimation array includes a plurality of Micro-collimation elements distributed in an array, wherein the Micro-collimation elements are in one-to-one correspondence with the Micro LEDs, and the Micro-collimation elements are located in the light emitting paths of the corresponding Micro LEDs.

In an embodiment of the invention, the micro-collimating array further includes a transparent substrate, wherein the micro-collimating elements are arranged in an array on the transparent substrate.

In an embodiment of the invention, the plurality of micro-collimating elements are integrally connected with the light-transmitting substrate to form the micro-collimating array having an integrated structure.

In an embodiment of the invention, the micro-collimating element is a micro-collimating lens, and the micro-collimating lens integrally extends upward from the upper surface of the light-transmitting substrate.

In an embodiment of the invention, the transparent substrate further has a plurality of receiving grooves, wherein the plurality of receiving grooves are distributed on the lower surface of the transparent substrate in an array, and the receiving grooves correspond to the Micro-alignment elements one to positionally receive the corresponding Micro LEDs.

In an embodiment of the invention, the micro-collimating element is a micro-collimating lens.

In an embodiment of the present invention, the micro-collimating element is a conical rod, wherein the conical rod has a light-entering end and a light-exiting end, and the size of the light-entering end of the conical rod is smaller than that of the light-exiting end.

In an embodiment of the invention, the micro-collimating element is a fresnel lens.

In one embodiment of the present invention, the Micro collimating element is a TIR lens, wherein the TIR lens has an inner cavity, and the Micro LED is accommodated in the inner cavity of the TIR lens.

In an embodiment of the invention, the Micro LED display device further includes an adhesive layer, wherein the adhesive layer is located between the Micro LED and the Micro-collimating array to firmly adhere the Micro-collimating array to the Micro LED.

In an embodiment of the invention, the bonding layer is formed by curing a light-transmitting adhesive, and the bonding layer covers the Micro LEDs in the Micro LEDs.

According to another aspect of the present invention, there is further provided a micro-projection system comprising:

a projection system body; and

the Micro LED display device is correspondingly arranged on the projection system body and used for providing image light for the projection system body; wherein the Micro LED display device comprises:

an array of Micro LEDs, wherein the array of Micro LEDs comprises:

a circuit board; and

According to another aspect of the present invention, the present invention further provides a method of manufacturing a Micro LED display device, comprising the steps of:

providing a Micro LED array and a Micro-collimation array, wherein the Micro LED array comprises a circuit board and a plurality of Micro LEDs, wherein the plurality of Micro LEDs are electrically energizable integrated on the circuit board and distributed in an array on the circuit board, wherein the Micro LEDs 11 have a light emitting path for emitting pixel beams along the light emitting path; and

correspondingly overlapping the Micro collimation array on the Micro LED array to collimate pixel light beams emitted by the Micro LEDs in the Micro LED array through the Micro collimation array.

In an embodiment of the present invention, the method for manufacturing a Micro LED display device further includes:

applying an adhesive between the Micro-alignment array and the Micro LED array to form a bonding layer securing the Micro-alignment array to the Micro LED array after the adhesive is cured.

Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.

These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the claims.

Drawings

Fig. 1 is a schematic distribution diagram of Micro LEDs in a Micro LED display device according to an embodiment of the present invention.

Fig. 2 shows a schematic cross-sectional view of the Micro LED display device according to the above embodiment of the present invention.

Fig. 3 shows a partially enlarged schematic view of the Micro LED display device according to the above embodiment of the present invention.

Fig. 4A and 4B show a first variant implementation of the Micro LED display device according to the above-described embodiment of the invention.

Fig. 5A and 5B show a second variant implementation of the Micro LED display device according to the above-described embodiment of the invention.

Fig. 6A and 6B show a third variant implementation of the Micro LED display device according to the above-described embodiment of the invention.

Fig. 7A and 7B show a fourth variant implementation of the Micro LED display device according to the above-described embodiment of the invention.

FIG. 8 illustrates one example of a micro-projection system according to an embodiment of the present invention.

FIG. 9 is a schematic flow chart of a method of manufacturing a Micro LED display device according to one embodiment of the present invention.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.

In the present invention, the terms "a" and "an" in the claims and the description should be understood as meaning "one or more", that is, one element may be one in number in one embodiment, and the element may be more than one in number in another embodiment. The terms "a" and "an" should not be construed as limiting the number unless the number of such elements is explicitly recited as one in the present disclosure, but rather the terms "a" and "an" should not be construed as being limited to only one of the number.

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

The Micro LED array is a high-density integrated LED array with a pitch of micrometer, and each Micro LED in the Micro LED array as a pixel point can be independently addressed and lighted to emit a pixel beam, so that the Micro LED array can emit corresponding image light according to a display requirement (i.e. the image light is composed of pixel beams arranged in an array). Due to the fact that the distance between the adjacent Micro LEDs is extremely small, and pixel light beams emitted by the Micro LEDs generally have a certain divergence angle, stray light effects exist in the Micro LED array, when the Micro LED array is directly applied to a Micro projection system to form the Micro projection system based on the Micro LEDs, not only is the light effect of the system reduced, but also the image quality of the system is seriously affected.

In order to improve the light energy utilization rate and the image quality of a Micro projection system based on a Micro LED, the invention provides a Micro LED display device which can provide collimated image light. Specifically, as shown in fig. 1 to 3, a Micro LED display device according to an embodiment of the present invention is illustrated, wherein the Micro LED display device 1 includes a Micro LED array 10 and a Micro collimating array 20, wherein the Micro collimating array 20 is stacked on the Micro LED array 10 for collimating image light emitted from the Micro LED array 10, so that the Micro LED display device 1 can provide collimated image light, so as to improve light energy utilization efficiency and image quality of a Micro LED-based Micro projection system.

More specifically, as shown in fig. 1 and 2, the Micro LED array 10 of the Micro LED display device 1 may include a plurality of Micro LEDs 11 arranged in an array, and the Micro LED11 has a light emitting path for emitting a pixel light beam along the light emitting path. The Micro-collimation array 20 comprises a plurality of Micro-collimation elements 21 arranged in an array, and the plurality of Micro-collimation elements 21 are respectively and correspondingly arranged in the light emitting paths of the corresponding Micro LEDs 11 and are used for collimating the pixel light beams emitted by the Micro LEDs 11 so as to reduce the divergence angle of the pixel light beams. It can be understood that, in the present invention, since the divergence angle of the pixel light collimated by the Micro-collimating element 21 is reduced, so that the light rays in the collimated pixel light beams are kept substantially parallel, even if the distance between the adjacent Micro LEDs 11 in the Micro LED array 10 of the Micro LED display device 1 is extremely small (reaching the micrometer level), the pixel light beams emitted by the adjacent Micro LEDs 11 do not interfere with each other after being collimated, which not only can avoid the stray light effect, but also can improve the light energy utilization rate and the image quality of the Micro LED-based Micro projection system.

Notably, as shown in fig. 1 and 2, the Micro LED array 10 of the Micro LED display device 1 further includes a circuit board 12, wherein the plurality of Micro LEDs 11 are electrically integrated on the circuit board 12 for controlling the addressed illumination of the plurality of Micro LEDs 11.

Furthermore, in an example of the present invention, as shown in fig. 2 and 3, preferably, the Micro collimating elements 21 of the Micro collimating array 20 correspond to the Micro LEDs 11 of the Micro LED array 10 in a one-to-one manner, that is, one Micro collimating element 21 in the Micro collimating array 20 corresponds to one Micro LED11 in the Micro LED array 10, so that only one Micro collimating element 21 exists in a light emitting path of each Micro LED11 to collimate a pixel light beam emitted through the corresponding Micro LED11 by the Micro collimating element 21, thereby reducing an emission angle of each pixel light and reducing a stray light effect. Of course, in other examples of the present invention, the Micro-collimating elements 21 of the Micro-collimating array 20 and the Micro LEDs 11 of the Micro LED array 10 may not be in one-to-one correspondence, for example: one Micro-collimating element 21 may correspond to two or more Micro LEDs 11, so that the volume of the Micro-collimating element 21 can be increased to reduce the difficulty of manufacturing the Micro-collimating element 21.

It should be noted that, in the above embodiment of the present invention, as shown in fig. 2 and fig. 3, the Micro-collimation array 20 further includes a transparent substrate 22, wherein the plurality of Micro-collimation elements 21 are arranged in the transparent substrate 22 in an array to form the Micro-collimation array 20 with a monolithic structure, so as to ensure that the Micro-collimation elements 21 correspond to the Micro LEDs 11 one-to-one while the plurality of Micro-collimation elements 21 in the Micro-collimation array 20 are rapidly stacked on the Micro LED array 10.

Preferably, as shown in fig. 3, the plurality of Micro-collimating elements 21 are integrally connected with the light-transmissive substrate 22 to form the Micro-collimating array 20 with an integral structure, which helps to securely stack the plurality of Micro-collimating elements 21 on the Micro LED array 10.

Illustratively, as shown in fig. 2 and 3, the Micro-collimating element 21 of the Micro-collimating array 20 can be, but is not limited to being, implemented as a Micro-collimating lens 211, wherein the Micro-collimating lens 211 integrally extends upward from the upper surface 221 of the transparent substrate 22 to form a Micro-convex lens structure distributed in an array on the upper surface 221 of the transparent substrate 22, so as to collimate the pixel light beams emitted by the corresponding Micro LEDs 11 through the Micro-collimating lens 211.

It should be noted that, as shown in fig. 3, since the plurality of Micro-collimating lenses 211 are uniformly distributed on the upper surface 221 of the transparent substrate 22, so that the lower surface 222 of the transparent substrate 22 can still be kept flat, the plurality of Micro-collimating lenses 211 can be quickly and firmly attached to the Micro LED array 10 through the transparent substrate 22, so that the pixel light beams emitted by the Micro LEDs 11 in the Micro LED array 10 can sequentially pass through the transparent substrate 22 and the Micro-collimating lenses 211, so as to achieve the collimation of the pixel light beams.

In addition, the surface type of the micro collimating lens 211 may be, but is not limited to, implemented as one of a free-form surface type, a spherical surface type, and an aspherical surface type.

It should be noted that, according to the above embodiment of the present invention, as shown in fig. 3, the transparent substrate 22 of the Micro-alignment array 20 has a plurality of receiving grooves 220, wherein the plurality of receiving grooves 220 are distributed on the lower surface 222 of the transparent substrate 22 in an array, and the receiving grooves 220 correspond to the Micro-alignment elements 21 in a one-to-one manner, so that when the Micro-alignment array 20 is stacked on the Micro LED array 10, the transparent substrate 22 can receive the corresponding Micro LEDs 11, which helps to protect the Micro LEDs 11 and reduce the thickness of the Micro LED display device 1.

It should be noted that, just as the accommodating grooves 220 of the transparent substrate 22 correspond to the Micro-collimating elements 21 one by one, when the Micro LEDs 11 can be accommodated in the corresponding accommodating grooves 220, the Micro-collimating elements 21 just can correspond to the corresponding Micro LEDs 11 to be located in the light emitting path of the Micro LEDs 11. Thus, the accommodating groove 220 of the transparent substrate 22 can not only protect the Micro LED11, but also have a good positioning effect, so as to reduce the difficulty in assembling the Micro LED display device 1.

In addition, in the above embodiment of the present invention, as shown in fig. 3, the Micro LED display device 1 may further include an adhesive layer 30, wherein the adhesive layer 30 is disposed between the circuit board 11 of the Micro LED array 10 and the transparent substrate 22 of the Micro alignment array 20, so as to firmly stack the Micro alignment array 20 on the Micro LED array 10 through the adhesive layer 30.

For example, as shown in fig. 3, an adhesive is applied on the lower surface 222 of the transparent substrate 22 of the Micro-alignment array 20, and then the Micro-alignment array 20 is correspondingly stacked on the Micro LED array 10, such that the adhesive is located between the transparent substrate 22 of the Micro-alignment array 20 and the circuit board 12 of the Micro LED array 10, so that after the adhesive is cured, the adhesive layer 30 is formed between the transparent substrate 22 of the Micro-alignment array 20 and the circuit board 12 of the Micro LED array 10, and the Micro LED11 is exposed outside the adhesive layer 30, so as to complete the manufacture of the Micro LED display device 1. It is understood that in other examples of the present invention, an adhesive may be applied on the circuit board 12 of the Micro LED array 10, or on both the transparent substrate 22 of the Micro-collimating array 20 and the circuit board 12 of the Micro LED array 10, as long as the Micro-collimating array 20 can be adhered to the Micro LED array 10.

It is noted that the spacing between adjacent Micro LEDs 11 in the Micro LED array 10 is extremely small, and it is difficult to ensure that the adhesive is applied to the Micro LEDs 11 when applying the adhesive, so in order to prevent the adhesive from interfering with the pixel beam emitted by the Micro LEDs 11, the adhesive layer 30 of the present invention is preferably cured from a light-transmissive adhesive.

Specifically, in other examples of the present invention, the adhesive layer 30 may also be disposed between the Micro LED11 of the Micro LED array 10 and the transparent substrate 22 of the Micro-collimating array 20, and still the Micro-collimating array 20 can be firmly stacked on the Micro LED array 10 by the adhesive layer 30.

Exemplarily, fig. 4A and 4B show a first variant implementation of the Micro LED display device 1 according to the above embodiment of the present invention, wherein the adhesive layer 30 covers the Micro LEDs 11 of the Micro LED array 10, so as to protect the Micro LEDs 11 by the adhesive layer 30 while the Micro-collimation array 20 is firmly attached to the Micro LED array 10. It is understood that in this variant embodiment of the invention, the transparent substrate 22 of the Micro-collimation array 20 does not need to be provided with the receiving groove 220, but is directly bonded to the Micro LED array 10 by the bonding layer 30

Notably, since the adhesive layer 30 directly covers the Micro LEDs 11 of the Micro LED array 10, the present invention can directly and completely apply an adhesive on the circuit board 12 of the Micro LED array 10 and cover the Micro LEDs 11 with the adhesive, which helps to reduce the difficulty of manufacturing the Micro LED display device 1.

It should be noted that fig. 5A and 5B illustrate a second variant implementation of the Micro LED display device according to the above embodiment of the invention. Specifically, as shown in fig. 5A, the Micro LED display device 1 according to the second variant embodiment of the present invention differs from the above-described embodiment according to the present invention in that: the Micro-collimating element 21 of the Micro-collimating array 20 of the Micro LED display device 1 is implemented as a conoid rod 212, such that the Micro-collimating array 20 forms a conoid rod array. The awl bar 212 has a light inlet end 2121 and a light outlet end 2122, and the size of the light inlet end 2121 of the awl bar 212 is smaller than the size of the light outlet end 2122 of the awl bar 212, wherein the light inlet end 2121 of the awl bar 212 is located close to the Micro LED11 of the Micro LED array 10, and the light outlet end 2122 of the awl bar 212 is located far from the Micro LED11 of the Micro LED array 10, so that the pixel light beam emitted through the Micro LED11 sequentially passes through the light inlet end 2121 and the light outlet end 2122 of the awl bar 212 to be collimated to reduce the divergence angle of the pixel light beam.

Further, in this variant embodiment of the present invention, as shown in fig. 5B, the light incident end 2121 of the awl bar 212 is directly attached to the Micro LED11 of the Micro LED array 10 through the adhesive layer 30. It is noted that since the light incident end 2121 of the awl bar 212 generally has a flat end surface, the present invention can directly and firmly fix the awl bar 212 to the Micro LED11 through the adhesive layer 30 to ensure that the awl bar 212 is correspondingly located in the light emitting path of the Micro LED 11.

Furthermore, in this variant embodiment of the present invention, as shown in fig. 5B, the light-transmitting substrate 22 of the Micro-collimation array 20 can be, but is not limited to being, integrally connected to the light-emitting end 2122 of the conical rod 212 to form the Micro LED array 10 with a unitary structure. In other words, the conical rods 212 integrally extend downward from the lower surface 222 of the transparent substrate 22, and the plurality of conical rods 212 are distributed in an array on the lower surface 222 of the transparent substrate 22.

It should be noted that, in this variant embodiment of the present invention, since the upper surface of the conical rod array (i.e., the upper surface of the light-transmitting substrate 22) is flat and the lower surface of the conical rod array (i.e., the end surface of the light-entering end 2121 of the conical rod 212) is located on the same plane, the conical rod array can be conveniently packaged, so as to reduce the packaging cost of the Micro LED display device 1.

Fig. 6A and 6B show a third variant implementation of the Micro LED display device according to the above-described embodiment of the invention. Specifically, the Micro LED display device 1 according to the third variant embodiment of the invention differs from the above-described example according to the invention in that: the Micro collimating element 21 of the Micro collimating array 20 of the Micro LED display device 1 is implemented as a fresnel lens 213, so as to collimate the pixel light beams emitted by the corresponding Micro LEDs 11 through the fresnel lens 213, thereby obtaining a better collimation effect. In other words, in this example of the invention, the Micro-collimation array 20 is implemented as a fresnel lens array for collimating the image light emitted by the Micro LED array 10 to reduce the optical energy loss and stray light effects of the system.

Fig. 7A and 7B show a third variant implementation of the Micro LED display device according to the above-described embodiment of the invention. Specifically, the Micro LED display device 1 according to the third variant embodiment of the invention differs from the above-described example according to the invention in that: the Micro-collimating element 21 of the Micro-collimating array 20 of the Micro LED display device 1 is implemented as a total internal reflection lens 214 (hereinafter TIR lens 214) for collimating by total internal reflection the pixel light beam emitted via the Micro LED 11.

More specifically, as shown in fig. 7B, the TIR lens 214 has an inner cavity 2140, wherein the Micro LED11 is received in the inner cavity 2140 of the TIR lens 214 to emit a pixel beam within the inner cavity 2140, such that the pixel beam propagates within the inner cavity 2140 before undergoing total internal reflection when passing through the TIR lens 214 to achieve collimation. It is understood that, since the pixel beam emitted by the Micro LED11 undergoes total internal reflection within the TIR lens 214, the TIR lens 214 can collimate the pixel beam while minimizing the loss of optical energy, so as to improve the optical energy utilization efficiency of the Micro LED-based Micro projection system.

In particular, since the Micro LEDs 11 are located within the respective inner cavities 2140 of the TIR lens 214, the TIR lens 214 not only protects the Micro LEDs 11 from damage, but also enables positioning of the Micro LED array 10 and the Micro collimating array 20 through the inner cavities 2140 of the TIR lens 214 so as to ensure a one-to-one correspondence of the TIR lens 214 and the Micro LEDs.

According to another aspect of the present invention, the present invention further provides a Micro projection system, as shown in fig. 8, wherein the Micro projection system includes at least one Micro LED display device 1 and a projection system body 400, wherein the Micro LED display device 1 is correspondingly disposed on the projection system body 400 for providing image light to the projection system body 400, so that the image light emitted through the Micro LED display device 1 can be projected and imaged to realize a projection function of the Micro projection system. It is worth mentioning that the type of the projection system body 400 is not limited, for example, the projection system body 400 may be any device or system capable of configuring the Micro LED display apparatus 1, such as an imaging system, e.g., an imaging lens group, a near-eye display device, an augmented reality device, and the like. It will be understood by those skilled in the art that although fig. 8 illustrates the projection system 400 as an imaging lens group, it does not limit the scope and content of the present invention.

According to another aspect of the present invention, the present invention further provides a method of manufacturing a Micro LED display device for providing collimated image light. Specifically, as shown in fig. 9, the method for manufacturing the Micro LED display device includes the steps of:

s100: providing a Micro LED array 10 and a Micro-collimation array 20, wherein the Micro LED array 10 comprises a circuit board 12 and a plurality of Micro LEDs 11, wherein the plurality of Micro LEDs 11 are electrically energizable integrated with the circuit board 12, and the plurality of Micro LEDs 11 are distributed in an array on the circuit board 12, wherein the Micro LEDs 11 have a light emitting path for emitting pixel beams along the light emitting path; and

s200: correspondingly, the Micro-collimation array 20 is stacked on the Micro LED array 10, so that the pixel light beams emitted by the Micro LEDs 11 in the Micro LED array 10 are collimated by the Micro-collimation array 20.

It is noted that, in this embodiment of the present invention, the Micro LED array 10 includes a plurality of Micro LEDs 11 distributed in an array, and the Micro collimating array 20 includes a plurality of Micro collimating elements 21 distributed in an array, wherein the Micro LEDs 11 are in one-to-one correspondence with the Micro collimating elements 21, so as to collimate the pixel beams emitted by the corresponding Micro LEDs 11 through the Micro collimating elements 21.

It should be noted that, in an example of the present invention, as shown in fig. 9, the method for manufacturing a Micro LED display device further includes the steps of:

s300: an adhesive is applied between the Micro-alignment array 20 and the Micro LED array 10 to form an adhesive layer 30 that secures the Micro-alignment array 20 to the Micro LED array 20 after the adhesive is cured.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims

1. A Micro LED display device, comprising:

an array of Micro LEDs, wherein the array of Micro LEDs comprises:

a circuit board; and

2. The Micro LED display device of claim 1, wherein the Micro-collimating array comprises a plurality of Micro-collimating elements distributed in an array, wherein the Micro-collimating elements are in one-to-one correspondence with the Micro LEDs and the Micro-collimating elements are located in the light emitting path of the respective Micro LEDs.

3. The Micro LED display device of claim 2, wherein the Micro-collimating array further comprises a light transmissive substrate, wherein the plurality of Micro-collimating elements are arranged in an array on the light transmissive substrate.

4. The Micro LED display device of claim 3, wherein the plurality of Micro-collimating elements are integrally connected with the light transmissive substrate to form the Micro-collimating array having a unitary structure.

5. The Micro LED display device of claim 4, wherein the Micro collimating element is a Micro collimating lens, and the Micro collimating lens integrally extends upward from an upper surface of the light transmissive substrate.

6. The Micro LED display device of claim 5, wherein the transparent substrate further has a plurality of receiving grooves, wherein the plurality of receiving grooves are distributed in an array on the lower surface of the transparent substrate, and the receiving grooves correspond one-to-one to the Micro-collimating elements to positionally receive the respective Micro LEDs.

7. A Micro LED display device according to claim 2 or 3, wherein the Micro collimating element is a Micro collimating lens.

8. The Micro LED display device of any of claims 2 to 4, wherein the Micro collimating element is a conical rod, wherein the conical rod has an entrance end and an exit end, and the entrance end of the conical rod is smaller in size than the exit end.

9. A Micro LED display device according to any of claims 2 to 4, wherein said Micro collimating element is a Fresnel lens.

10. The Micro LED display device of any of claims 2 to 4, wherein the Micro collimating element is a TIR lens, wherein the TIR lens has an interior cavity, and the Micro LED is housed in the interior cavity of the TIR lens.

11. The Micro LED display device of any of claims 1 to 6, further comprising an adhesive layer, wherein the adhesive layer is positioned between the Micro LED and the Micro-collimating array to securely bond the Micro-collimating array to the Micro LED.

12. The Micro LED display device of claim 11, wherein the bonding layer is cured from a light transmissive adhesive and the bonding layer encapsulates the Micro LEDs of the Micro LEDs.

13. A micro-projection system, comprising:

a projection system body; and

an array of Micro LEDs, wherein the array of Micro LEDs comprises:

a circuit board; and

14. A method for manufacturing a Micro LED display device is characterized by comprising the following steps:

15. The method of manufacturing a Micro LED display device according to claim 14, wherein the Micro-collimating array comprises a plurality of Micro-collimating elements distributed in an array, wherein the Micro-collimating elements are in one-to-one correspondence with the Micro LEDs and are located in the light emitting path of the respective Micro LEDs.

16. The method of manufacturing a Micro LED display device according to claim 14 or 15, further comprising the steps of: