WO2021093504A1

WO2021093504A1 - Color combination apparatus, micro led display apparatus, method therefor, and system thereof, and device

Info

Publication number: WO2021093504A1
Application number: PCT/CN2020/120872
Authority: WO
Inventors: 张倩; 王雁茹; 陈杭; 胡增新
Original assignee: 舜宇光学（浙江）研究院有限公司
Priority date: 2019-11-13
Filing date: 2020-10-14
Publication date: 2021-05-20

Abstract

A color combination apparatus (20, 20A, 20B, 20C), a Micro LED display apparatus (1', 1'', 10'', 10A), a method therefor, and a system (1) thereof, and a device. The color combination apparatus (20, 20A, 20B, 20C) comprises: a second prism (22, 22A) used for totally reflecting second monochromatic light (102); a third prism (23, 23A) used for totally reflecting third monochromatic light (103); a first film system (24, 24A, 22B, 22C) used for reflecting the second monochromatic light (102) and transmitting first monochromatic light (101) and the third monochromatic light (103); and a second film system (25, 25A, 23B, 23C) used for reflecting the third monochromatic light (103) and transmitting the first monochromatic light (101). The first film system (24, 24A, 22B, 22C) is located between the second prism (22, 22A) and the third prism (23, 23A), and is used for reflecting the second monochromatic light (102) totally reflected by the second prism (22, 22A) back to the second prism (22, 22A) so as to propagate along a combined color light path. The third prism (23, 23A) is located between the second film system (25, 25A, 23B, 23C) and the first film system (24, 24A, 22B, 22C), wherein the second film system (25, 25A, 23B, 23C) is used for reflecting the third monochromatic light (103) totally reflected by the third prism (23, 23A) back to the third prism (23, 23A) so as to propagate along the combined color light path, and the second film system (25, 25A, 23B, 23C) is also used for transmitting the first monochromatic light (101) so as to propagate along the combined color light path.

Description

Color combination device, Micro LED display device and its method, system and equipment

Technical field

The present invention relates to the field of projection technology, in particular to a color combination device and its method and lighting system, a Micro LED display device and its method and a micro projection system, as well as a Micro LED-based micro projection light engine and its method and near-eye display equipment .

Background technique

In recent years, the emergence of micro-display chip technology has made miniaturization and high-resolution projection display possible. With the continuous development of projection display technology and market demand, more and more attention has been paid to the miniature projection light engine with large field of view, high image quality, small size, and wearable, especially in the current development of the fiery augmented reality (Augmented Reality, AR for short), Near-eye display (NED for short), and wearable fields.

However, the existing miniature projection light engine realizes color display, and its lighting system usually uses color combination devices such as X-Cube to combine the three primary colors of polarized light from three light paths into the same light path. in. As shown in Figure 1, the X color prism is usually formed by glueing four right-angle prisms 11P along a right-angled surface, and the right-angled surface of the right-angle prism 11P is plated with corresponding first and

second film systems

12P, 13P; of which four right-angled The slopes of the prism 11P serve as the light input and output surfaces, and the red, green, and blue polarized

light sources

21P, 22P, and 23P respectively correspond to the slopes of the three right-angle prisms 11P, and the slope of the remaining one right-angle prism 11P is used as the three The output surface after the primary color light is synthesized into white light.

However, although the X color combination prism can synthesize three primary colors of polarized light into one white light, it is limited by the structure of the X color combination prism, and its structure is relatively loose and bulky, which leads to the problem of the illumination system equipped with the X color combination prism. The volume and weight are relatively large, which cannot meet the market demand of small volume and light weight.

In addition, as shown in FIG. 1, the first film system 12P of the X color combination prism is a short-pass two-color filter film for reflecting red light and transmitting blue and green light, and the second film system 13P is for reflecting The long-pass two-color filter film that transmits blue light and transmits red light and green light, which makes the design of the film system more demanding. At the same time, the processing and manufacturing of the X-color prism is more complicated. On the one hand, the first and

second film systems

12P and 13P that are plated on the right-angled surface of the right-angle prism 11P must have good consistency, resulting in coating The difficulty is higher; on the other hand, when the right-angled surfaces of the right-angle prism 11P are glued, the X-shaped cross lines between the four right-angle prisms 11P are prone to misalignment.

In addition, in recent years, with the emergence of LED technology and micro-display chip technology, miniaturization and high-resolution projection displays have become possible. With the continuous development of projection display technology and market demand, more and more attention has been paid to the miniature projection light engine with large field of view, high image quality, small size, and wearable, especially in the current development of augmented reality (Augmented Reality). , AR for short), Near-eye display (NED for short), and wearable fields. However, current near-eye display devices based on various projection technologies such as LCOS, LCD, DMD, or OLED still have many shortcomings, such as large size, high cost, heavy equipment, etc., which greatly limit their consumer-oriented development of.

With the advent of micro-light-emitting diode (hereinafter referred to as Micro LED) display technology, it is possible to miniaturize near-eye display devices. First of all, Micro LED display technology is to miniaturize traditional LEDs to form a micron-pitch LED array to achieve ultra-high-density pixel resolution. In other words, the Micro LED array is a high-density integrated micron-pitch LED array. Each LED can be used as a pixel to be independently addressed and lit. In other words, each LED pixel in the Micro LED array can emit light by itself, and image display can be realized through precise control of the luminous intensity of each LED, that is, the Micro LED array can directly emit image light. Secondly, in addition to the characteristics of high brightness, ultra-high resolution, color saturation, and high luminous efficiency, Micro LEDs, more importantly, are not affected by water vapor, oxygen or high temperature. Therefore, Micro LEDs are stable and useful It has obvious advantages in terms of life span and working temperature. In addition, the power consumption of Micro LED is about 10% of LCD and 50% of OLED. Compared with OLED, to achieve the same display brightness, only about 10% of the coating area of the latter is required. In summary, the above-mentioned advantages of Micro LED display technology determine that it will have a wide range of applications in the field of micro-projection, especially near-eye display, and augmented reality.

However, the light beam emitted by each LED in the existing Micro LED array usually has a large divergence angle, and a large-angle beam will not only reduce the light efficiency of the system, but also cause stray light effects, especially seriously The light efficiency and image quality of the micro-projection system based on Micro LED.

At present, as shown in FIG. 17, the existing micro-projection light engine 1P'normal light source system 11P', relay lens group 12P', display chip 13P', and projection imaging system 14P', wherein the relay lens group 12P' is located The emission path of the light source system 11P', and the display chip 13P' and the projection imaging system 14P' are respectively located on opposite sides of the relay lens group 12P'. When the light source system 11P' emits the illumination beam along the emission path, the relay lens group 12P' first transmits the illumination beam to the display chip 13P', so as to modulate the illumination beam into an image by the display chip 13P' such as LCOS. After light, the image light is transmitted to the projection imaging system 14P' to project and image the image light through the projection imaging system 14P'.

However, the existing miniature projection light engine is limited by its own structure (as shown in FIG. 17, the illumination beam emitted by the light source system 11P' must pass through the large and heavy relay lens group 12P' to reach the display chip 13P. 'Required irradiation area, and redirected transmission of the illumination beam, so as to modulate the image light through the display chip 13P', etc.), there are many shortcomings, such as large size, heavy equipment, extremely difficult to manufacture, etc., It is difficult to meet the market's demand for miniature projection light engines with small size and light weight, especially in areas such as augmented reality, near-eye display, and wearables.

Summary of the invention

One advantage of the present invention is to provide a color combination device, a method thereof, and a lighting system, which can convert three monochromatic lights into one light to achieve a corresponding color combination effect.

Another advantage of the present invention is to provide a color combination device, a method thereof, and a lighting system. In an embodiment of the present invention, the color combination device has a compact structure, which helps to reduce the cost of the lighting system. Size, volume.

Another advantage of the present invention is to provide a color combination device and its method and lighting system, wherein, in an embodiment of the present invention, the color combination device can use ordinary coating and gluing processes, and there is no difficulty in alignment. The problem is conducive to reducing costs.

Another advantage of the present invention is to provide a color combination device, a method thereof, and a lighting system. In an embodiment of the present invention, the color combination device has a high color combination efficiency and can be applied to various types of Projection display system.

Another advantage of the present invention is to provide a color combination device, a method thereof, and a lighting system, wherein, in an embodiment of the present invention, the color combination device can combine colors of three channels of image light, Ensuring that the optical paths of the three image lights in the color combining device are equal can help reduce aberrations and improve image quality.

Another advantage of the present invention is to provide a color combination device, a method thereof, and a lighting system. In an embodiment of the present invention, the color combination device can be folded back to ensure that sufficient light is provided for the image light. In the case of the process, the size or volume of the color combination device is reduced.

Another advantage of the present invention is to provide a color combination device, a method thereof, and a lighting system, wherein, in order to achieve the above-mentioned object, there is no need to use expensive materials or complicated structures in the present invention. Therefore, the present invention successfully and effectively provides a solution that not only provides a simple color combination device and its method and lighting system, but also increases the practicability and reliability of the color combination device and its method and lighting system.

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 the divergence angle of the emitted light, which is beneficial to improve the light efficiency of the system and reduce the 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. In an embodiment of the present invention, the Micro LED display device can micro-align the emitted light of the Micro LED array. Straightening treatment helps to improve 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 pass through the micro collimation in the micro collimation array The components separately and effectively collimate each LED in the Micro LED array, which helps to achieve high-efficiency 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 rate of the micro projection system and Image quality, 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, wherein, in order to achieve the above objective, the present invention does not need to use expensive materials or complicated structures. Therefore, the present invention successfully and effectively provides a solution that not only provides a simple Micro LED display device and its method and micro projection system, but also increases the practicability and practicability of the Micro LED display device and its method and micro projection system. reliability.

One advantage of the present invention is to provide a micro-LED-based micro-projection light engine and a method thereof, and a near-eye display device, which can meet the market demand for a small-size and light-weight micro-projection light engine.

Another advantage of the present invention is to provide a micro-LED-based micro-projection light engine and a method thereof, and a near-eye display device. In an embodiment of the present invention, the micro-LED-based micro-projection light engine can optimize the current Some micro-projection light engines have the structure to overcome the shortcomings caused by the limitations of the existing micro-projection light engines.

Another advantage of the present invention is to provide a micro-LED-based micro-projection light engine, a method thereof, and a near-eye display device. In an embodiment of the present invention, the micro-LED-based micro-projection light engine can use Micro LEDs. The LED display technology eliminates the relay lens group in the existing micro-projection light engine, which is convenient for greatly reducing the volume and weight of the micro-projection light engine.

Another advantage of the present invention is to provide a micro-LED-based micro-projection light engine and a method thereof, and a near-eye display device, wherein, in an embodiment of the present invention, the micro-LED-based micro-projection light engine does not need to use polarization Light and compound eye technology can greatly improve the utilization rate of light energy.

Another advantage of the present invention is to provide a micro-LED-based micro-projection light engine and a method thereof and a near-eye display device. In an embodiment of the present invention, the micro-LED-based micro-projection light engine uses a micro-projection light engine. The collimation array technology can improve the image quality while further improving the utilization rate of light energy.

Another advantage of the present invention is to provide a micro-LED-based micro-projection light engine, a method thereof, and a near-eye display device. In an embodiment of the present invention, the micro-LED-based micro-projection light engine adopts innovative The color combination technology helps to reduce the difficulty of processing and assembly, and reduce costs, while also maximizing the overall light energy utilization rate of the light engine and reducing the overall volume of the light engine.

Another advantage of the present invention is to provide a micro-LED-based micro-projection light engine and a method thereof, and a near-eye display device, wherein, in an embodiment of the present invention, the micro-LED-based micro-projection light engine adopts overall innovation The light path design can meet the market demand of small size, light weight and high resolution.

Another advantage of the present invention is to provide a micro-projection light engine based on a Micro LED, a method thereof, and a near-eye display device. In order to achieve the above objective, the present invention does not need to use expensive materials or complicated structures. Therefore, the present invention successfully and effectively provides a solution that not only provides a simple Micro LED-based micro-projection light engine and its method and near-eye display device, but also adds the Micro LED-based micro-projection light engine and its method. And the practicality and reliability of near-eye display devices.

In order to achieve at least one of the above advantages or other advantages and objectives, the present invention provides a color combining device for combining the first monochromatic light, the second monochromatic light, and the third monochromatic light into one light, wherein The color combination device has a color combination light path and includes:

A second prism for total reflection of the second monochromatic light incident on the second prism;

A third prism for total reflection of the third monochromatic light incident on the third prism;

A first film system, wherein the first film system is used to reflect the second monochromatic light, and transmit the first monochromatic light and the third monochromatic light, wherein the first film is located at Between the second prism and the third prism, and the first film system is used to reflect the second monochromatic light totally reflected by the second prism back to the second prism, so that the The second monochromatic light propagates along the combined color light path after passing through the second prism; and

A second film system, wherein the second film system is used to reflect the third monochromatic light and transmit the first monochromatic light, and the third prism is located between the second film system and the first monochromatic light. Between a film system, wherein the second film system is used to reflect the third monochromatic light totally reflected by the third prism back to the third prism, so that the third monochromatic light passes through sequentially After passing through the third prism, the first film system, and the second prism, it propagates along the color-combining light path, and the second film system is also used to transmit the first monochromatic light to the first A triangular prism, so that the first monochromatic light passes through the second film system, the third prism, the first film system, and the second prism in sequence, and then propagates along the combined color light path.

In an embodiment of the present invention, the color combination device further includes a first prism, wherein the second film system is located between the first prism and the third prism for making the first prism The monochromatic light passes through the first prism, the second film system, the third prism, the first film system, and the second prism in sequence, and then propagates along the combined color light path.

In an embodiment of the present invention, the first prism has a first incident surface and a first exit surface, and the first exit surface of the first prism faces the second film system for The first monochromatic light incident from the first incident surface is emitted from the first exit surface after passing through the first prism to be directed toward the second film system.

In an embodiment of the present invention, the first prism further has a first functional surface, wherein the first functional surface of the first prism serves as a total reflection surface for total reflection from the first incident surface. The first monochromatic light incident on the surface causes the first monochromatic light after being totally reflected to emerge from the first exit surface.

In an embodiment of the present invention, the color combination device further includes a third film system, wherein the third film system is used to reflect the first monochromatic light, and the third film system corresponds to Groundly arranged on the first prism, for reflecting the first monochromatic light incident from the first incident surface, so that the reflected first monochromatic light is emitted from the first exit surface .

In an embodiment of the present invention, the second prism has a second incident surface and a second exit surface, wherein the second exit surface of the second prism serves as a total reflection surface for total reflection from The second monochromatic light incident from the second incident surface makes the second monochromatic light totally reflected toward the first film system.

In an embodiment of the present invention, the second prism further has a second functional surface, wherein the second functional surface of the second prism faces the third prism, and the first film is coated On the second functional surface of the second prism.

In an embodiment of the present invention, the third prism has a third incident surface and a third exit surface, wherein the third exit surface of the third prism serves as a total reflection surface, and all of the third prism The third exit surface corresponds to the second functional surface of the second prism, and is used to totally reflect the third monochromatic light incident from the third incident surface, so that the totally reflected light The third monochromatic light is directed to the second film system.

In an embodiment of the present invention, the third prism further has a third functional surface, wherein the third functional surface of the third prism corresponds to the first exit surface of the first prism, and The second film is plated on the third functional surface of the third prism.

In an embodiment of the present invention, the color combination device further has an air gap, wherein the air gap is located between the third exit surface of the third prism and the first film system.

In an embodiment of the present invention, the color combination device further includes an anti-reflection film, wherein the anti-reflection film is respectively disposed on the first incident surface and the first exit surface of the first prism Surface, the second incident surface of the second prism, and the third incident surface of the third prism.

In an embodiment of the present invention, the first film system is a red light-reflecting film or a blue light-reflecting film, and the second film system is correspondingly the blue light-reflecting film or the red light-reflecting film.

According to another aspect of the present invention, the present invention further provides a lighting system, including:

A light source unit, wherein the light source unit includes:

A first light-emitting element for emitting the first monochromatic light;

A second light-emitting element for emitting a second monochromatic light; and

A third light-emitting element for emitting a third monochromatic light; and

A color combination device, wherein the color combination device has a color combination light path and includes:

A second prism, wherein the second prism corresponds to the second light-emitting element, and the second prism has a total reflection structure for totally reflecting the second monochromatic light from the second light-emitting element ；

A third prism, wherein the third prism corresponds to the third light-emitting element, and the third prism has a total reflection structure for totally reflecting the third monochromatic light from the third light-emitting element;

A second film system, wherein the second film system is used to reflect the third monochromatic light and transmit the first monochromatic light, and the third prism is located between the second film system and the first monochromatic light. Between a film system, wherein the second film system is used to reflect the third monochromatic light totally reflected by the third prism back to the third prism, so that the third monochromatic light passes through sequentially After passing through the third prism, the first film system, and the second prism, it propagates along the combined color light path, and the second film system is also used to transfer the first path from the first light-emitting element The monochromatic light is transmitted to the third prism, so that the first monochromatic light passes through the second film system, the third prism, the first film system, and the second prism in sequence. The combined color light path spreads.

In an embodiment of the present invention, the color combination device further includes a first prism, wherein the second film system is located between the first prism and the third prism, and the first prism corresponds to The first light-emitting element is used to make the first monochromatic light from the first light-emitting element pass through the first prism, the second film system, the third prism, and the first prism in sequence. A film system and the second prism propagate along the combined color light path.

In an embodiment of the present invention, the sizes of the first prism, the second prism, and the third prism of the color combination device are matched with each other to make the first monochromatic light and the second monochromatic light The optical path of the monochromatic light and the third monochromatic light in the color combining device are the same.

In an embodiment of the present invention, the first light-emitting element, the second light-emitting element, and the third light-emitting element are monochromatic MicroLEDs of different colors.

According to another aspect of the present invention, the present invention further provides a color combination method, including the steps:

Respectively totally reflecting the second monochromatic light and the third monochromatic light to change the propagation direction of the second monochromatic light and the third monochromatic light; and

The second monochromatic light and the third monochromatic light after being totally reflected are respectively reflected to change the propagation direction of the second monochromatic light and the third monochromatic light again, so that the second monochromatic light The monochromatic light and the third monochromatic light propagate along the same optical path as the first monochromatic light after being turned twice.

In an embodiment of the present invention, the color combination method further includes the steps:

Reflect the first monochromatic light to change the propagation direction of the first monochromatic light, so that the second monochromatic light and the third monochromatic light will be simultaneously with the reflected light after being turned twice. The first monochromatic light travels along the same optical path.

In order to achieve at least one of the above advantages or other advantages and objectives, the present invention provides a Micro LED display device, including:

A Micro LED array, where the Micro LED array includes:

A circuit board; and

A plurality of Micro LEDs, wherein the plurality of Micro LEDs are energized and integrated on the circuit board, and the plurality of Micro LEDs are arranged in an array on the circuit board, wherein the Micro LEDs have a light emitting path, For emitting a light beam of pixels along the light emitting path; and

A micro collimating array, wherein the micro collimating array is correspondingly stacked on the Micro LED array for collimating the pixel beams emitted by the Micro LED.

In an embodiment of the present invention, the micro-collimating array includes a plurality of micro-collimating elements distributed in an array, wherein the micro-collimating elements correspond to the Micro LEDs one-to-one, and the micro-collimating elements are located at Corresponding to the light emitting path of the Micro LED.

In an embodiment of the present invention, the micro-collimation array further includes a light-transmitting substrate, wherein the plurality of micro-collimation elements are arranged on the light-transmitting substrate in an array.

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

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

In an embodiment of the present invention, the light-transmitting substrate further has a plurality of accommodating grooves, wherein the plurality of accommodating grooves are arranged in an array on the lower surface of the light-transmitting substrate, and the accommodating grooves and the micro The collimating elements are in one-to-one correspondence to locate and accommodate the corresponding Micro LEDs.

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

In an embodiment of the present invention, the micro-collimating element is a cone rod, wherein the cone rod has a light entrance end and a light exit end, and the size of the light entrance end of the cone rod is smaller than the light exit end. The size of the end.

In an embodiment of the present invention, the micro collimator element is a Fresnel lens.

In an 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 present invention, the Micro LED display device further includes an adhesive layer, wherein the adhesive layer is located between the Micro LED and the micro collimator array to connect the micro LED The collimating array is firmly bonded to the Micro LED.

In an embodiment of the present invention, the adhesive layer is cured by a light-transmitting adhesive, and the adhesive layer covers the Micro LED in the Micro LED.

According to another aspect of the present invention, the present invention further provides a micro projection system, including:

A projection system body; and

A Micro LED display device, wherein the Micro LED display device is correspondingly disposed on the projection system body for providing image light for the projection system body; wherein the Micro LED display device includes:

A Micro LED array, where the Micro LED array includes:

A circuit board; and

A micro collimation array, wherein the micro collimation array is correspondingly stacked on the Micro LED array, and is used to collimate the pixel beams emitted by the Micro LED.

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

A Micro LED array and a micro collimation array are provided, wherein the Micro LED array includes a circuit board and a plurality of Micro LEDs, wherein the plurality of Micro LEDs are energized and integrated on the circuit board, and the plurality of Micro LEDs are energized and integrated on the circuit board. Micro LEDs are distributed in an array on the circuit board, wherein the Micro LED 11 has a light emitting path for emitting pixel beams along the light emitting path; and

Correspondingly, the micro collimating array is stacked on the Micro LED array, so as to collimate the pixel beams emitted by the Micro LED in the Micro LED array through the micro collimating array.

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

Apply an adhesive between the micro-collimation array and the Micro LED array to form an adhesive layer for fixing the micro-collimation array to the Micro LED array after the adhesive is cured .

In order to achieve at least one of the above advantages or other advantages and objectives, the present invention provides a Micro LED-based micro projection light engine, including:

A Micro LED display device, wherein the Micro LED display device is used to provide image light; and

An imaging lens group, wherein the imaging lens group is correspondingly arranged on the Micro LED display device for projecting and imaging the image light from the Micro LED display device.

In an embodiment of the present invention, the Micro LED display device includes at least one Micro LED array, wherein the Micro LED array includes a circuit board and a plurality of Micro LEDs, wherein the plurality of Micro LEDs are electrically integrated On the circuit board, and the plurality of Micro LEDs are arranged in an array on the circuit board, wherein the Micro LEDs are used to emit a pixel beam.

In an embodiment of the present invention, the Micro LED display device further includes at least one micro collimating array, wherein the micro collimating array includes a plurality of micro collimating elements distributed in an array, wherein the micro collimating array is Correspondingly, they are stacked on the Micro LED array, and the micro collimating elements are in one-to-one correspondence with the Micro LEDs, and are used to collimate the pixel beams emitted by the Micro LEDs.

In an embodiment of the present invention, the Micro LED display device further includes at least one adhesive layer, wherein the adhesive layer is disposed between the Micro LED array and the micro collimation array so as to pass through the The adhesive layer firmly overlaps the micro-collimation array on the Micro LED array.

In an embodiment of the present invention, the micro collimating element is one selected from the group consisting of micro collimating lens, cone rod, Fresnel lens and TIR lens.

In an embodiment of the present invention, the Micro LED-based micro projection light engine further includes a color combination device, wherein the color combination device is disposed between the Micro LED display device and the imaging lens group. In the optical path between the two, wherein the color combination device is used to combine three channels of monochromatic image light provided by the Micro LED display device into one color image light, and the imaging lens group is used to combine the color image light through the color combination. The color image formed by the combination of the device is light-projected into a color image.

In an embodiment of the present invention, the Micro LED display device includes a first monochromatic Micro LED array for emitting a first monochromatic image light, and a second monochromatic LED array for emitting a second monochromatic image light. Monochromatic Micro LED array and a third monochromatic Micro LED array for emitting a third channel of monochromatic image light, wherein the first monochromatic Micro LED array, the second monochromatic Micro LED array, and the second monochromatic Micro LED array Three monochromatic Micro LED arrays are respectively arranged on the three incident surfaces of the color combination device, and the imaging lens group corresponds to the exit surface of the color combination device.

In an embodiment of the present invention, the color combination device includes a first prism, a second prism for totally reflecting the second monochromatic image light, and a second prism for totally reflecting the third monochromatic image. Light third prism, a first film system for reflecting the second monochromatic image light and transmitting the first monochromatic image light and the third monochromatic image light, and a first film system for reflecting the third monochromatic image light A second film system that transmits monochromatic light and transmits the first monochromatic light, wherein the third prism is disposed between the first prism and the second prism, and the first film is Between the second prism and the third prism, the second path of monochromatic image light totally reflected by the second prism is used to reflect back to the second prism so as to be along a side of the color combination device. The combined color light path propagates; wherein the second film system is located between the first prism and the third prism, and is used to reflect the third monochromatic image light that is totally reflected by the third prism back to the first A triangular prism is used to propagate along the combined color light path, and the second film system is also used to transmit the first path of monochromatic image light passing through the first prism to propagate along the combined color light path.

In an embodiment of the present invention, the color combination device is an X color combination prism or an X color combination plate.

According to another aspect of the present invention, the present invention further provides a near-eye display device, including:

A close-to-eye display device body; and

At least one Micro LED-based micro-projection light engine, wherein the Micro LED-based micro-projection light engine is correspondingly disposed on the near-eye display device body for providing image light for the near-eye display device body; wherein The micro-projection light engine based on Micro LED includes:

In an embodiment of the present invention, the body of the near-eye display device is a display waveguide for turning the image light provided by the micro-projection light engine based on the Micro LED.

In an embodiment of the present invention, the main body of the near-eye display device is a fold-back display for reflexively transmitting the image light provided by the micro-LED-based micro-projection light engine.

In an embodiment of the present invention, the fold-back display includes a reflective component and a see-through reflective component, wherein the reflective component is arranged in the projection path of the Micro LED-based micro projection light engine, and The see-through reflection component is correspondingly disposed on the reflection side of the anti-transmission component, and is used to make the image light from the Micro LED-based micro projection light engine first reflect by the anti-transmission component to propagate to the perspective The reflective component is then reflected by the see-through reflective component back to the anti-transmitting component to pass through the anti-transmitting component.

According to another aspect of the present invention, the present invention further provides a method for manufacturing a micro-projection light engine based on Micro LED, which includes the steps:

Providing at least one Micro LED array and an imaging lens group, wherein the Micro LED array is used to emit image light; and

Correspondingly, the imaging lens group is arranged on the Micro LED array, so that the imaging lens group can project and image the image light emitted through the Micro LED array.

In an embodiment of the present invention, the manufacturing method of the micro-projection light engine further includes the steps:

A micro collimating array is respectively arranged in the light path between the Micro LED array and the imaging lens group, so that the image light emitted by the Micro LED array is first collimated by the micro collimating array, and then Projection imaging is performed through the imaging lens group.

A color combining device is arranged in the light path between the plurality of Micro LED arrays and the imaging lens group, so that the image light emitted through the Micro LED array is combined by the color combining device, and then passes through The imaging lens group performs projection imaging.

Through the understanding of the following description and drawings, the further objectives and advantages of the present invention will be fully embodied.

These and other objectives, features and advantages of the present invention are fully embodied by the following detailed description, drawings and claims.

Description of the drawings

Fig. 1 shows a schematic diagram of the color combination principle of an illumination system equipped with an X color combination prism in the prior art.

Fig. 2 is a schematic structural diagram of a lighting system according to an embodiment of the present invention.

Fig. 3 shows a schematic diagram of the color combination principle of the illumination system according to the above-mentioned embodiment of the present invention.

4A and 4B show a first modified implementation of the lighting system according to the above-mentioned embodiment of the present invention.

Fig. 5 shows a second modified implementation of the lighting system according to the above-mentioned embodiment of the present invention.

Fig. 6 shows a third modified implementation of the lighting system according to the above-mentioned embodiment of the present invention.

FIG. 7 is a schematic flowchart of a color combination method according to an embodiment of the present invention.

FIG. 8 is a schematic diagram of the distribution of Micro LEDs in a Micro LED display device according to an embodiment of the present invention.

FIG. 9 shows a schematic cross-sectional view of the Micro LED display device according to the above-mentioned embodiment of the present invention.

FIG. 10 shows a partial enlarged schematic diagram of the Micro LED display device according to the above-mentioned embodiment of the present invention.

11A and 11B show a first modified implementation of the Micro LED display device according to the above-mentioned embodiment of the present invention.

12A and 12B show a second modified implementation of the Micro LED display device according to the above-mentioned embodiment of the present invention.

13A and 13B show a third modified embodiment of the Micro LED display device according to the above-mentioned embodiment of the present invention.

14A and 14B show a fourth modified embodiment of the Micro LED display device according to the above-mentioned embodiment of the present invention.

Fig. 15 shows an example of a micro projection system according to an embodiment of the present invention.

FIG. 16 is a schematic flowchart of a manufacturing method of a Micro LED display device according to an embodiment of the present invention.

FIG. 17 shows a schematic diagram of the structure of an existing miniature projection light engine.

Fig. 18 is a schematic structural diagram of a micro-projection light engine based on a Micro LED according to the first embodiment of the present invention.

FIG. 19 shows a partial enlarged schematic diagram of the Micro LED display device according to the above-mentioned embodiment of the present invention.

Fig. 20 is a schematic structural diagram of a micro-projection light engine based on a Micro LED according to a second embodiment of the present invention.

FIG. 21 shows a first modified implementation of the Micro LED-based micro projection light engine according to the above-mentioned second embodiment of the present invention.

Fig. 22 shows a second modified implementation of the Micro LED-based micro-projection light engine according to the above-mentioned second embodiment of the present invention.

FIG. 23A shows an example of a near-eye display device according to an embodiment of the present invention.

FIG. 24B shows another example of a near-eye display device according to an embodiment of the present invention.

FIG. 25 is a schematic flowchart of a method for manufacturing a micro-projection light engine based on a Micro LED according to an embodiment of the present invention.

Detailed ways

The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and The description is simplified, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore the above-mentioned terms should not be construed as limiting the present invention.

In the present invention, the term "a" in the claims and specification should be understood as "one or more", that is, in one embodiment, the number of an element may be one, and in another embodiment, the number of the element It can be more than one. Unless it is clearly stated in the disclosure of the present invention that the number of the element is only one, the term "one" cannot be understood as unique or singular, and the term "one" cannot be understood as a limitation on the number.

In the description of the present invention, it should be understood that “first”, “second”, etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly defined and defined, “connected” and “connected” should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection. ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through a medium. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood according to specific situations.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean specific features described in conjunction with the embodiment or example , Structure, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples and the features of the different embodiments or examples described in this specification without contradicting each other.

2 and 3 of the drawings, a lighting system according to an embodiment of the present invention is illustrated. Specifically, the lighting system 1 includes a light source unit 10 and a color combining device 20, wherein the light source unit 10 is correspondingly disposed on the light incident side of the color combining device 20, wherein the light source unit 10 is used for Provide three monochromatic lights for the color combining device 20, wherein the color combining device 20 has a color combining light path (not shown in the figure) for combining the three monochromatic lights provided by the light source unit 10 A path of light propagating along the combined color light path.

More specifically, as shown in FIGS. 2 and 3, the light source unit 10 may include a first light-emitting element 11, a second light-emitting element 12, and a third light-emitting element 13, wherein the first light-emitting element 11 is To emit a first path of monochromatic light 101; wherein the second light-emitting element 12 is used to emit a second path of monochromatic light 102; wherein the third light-emitting element 13 is used to emit a third path of monochromatic light 103. It is worth noting that the first light-emitting element 11, the second light-emitting element 12, and the third light-emitting element 13 are preferably implemented as a green light-emitting element, a red light-emitting element, and a blue light-emitting element in sequence, so that all The first monochromatic light 101, the second monochromatic light 102, and the third monochromatic light 103 are sequentially implemented as three primary colors of green light, red light, and blue light (ie, RGB). It is understandable that in other examples of the present invention, the first light-emitting element 11, the second light-emitting element 12, and the third light-emitting element 13 may also be implemented as light-emitting elements of other colors for emitting light. Corresponding monochromatic light.

In the above-mentioned embodiment of the present invention, the color combination device 20 is used to combine the first monochromatic light 101 from the first light-emitting element 11 and the second light from the second light-emitting element 12 The monochromatic light 102 and the third monochromatic light 103 from the third light-emitting element 13 combine a combined color light that travels along the combined color light path. It is understandable that, in order to ensure that the drawings can clearly show the color combination process and principle of the color combination device 20 in the present invention, for example, in the drawing of FIG. 3, the three colors propagating along the color combination light path after color combination are shown in FIG. A single monochromatic light is drawn separately.

In particular, as shown in FIGS. 2 and 3, the color combination device 20 of the present invention may include a first prism 21, a second prism 22, a third prism 23, a first film 24, and a second prism. The film system 25, wherein the third prism 23 is disposed between the first prism 21 and the second prism 22, and the first film system 24 is disposed on the second prism 22 and the first prism 22. Between the triangular prisms 23 and the second film system 25 is arranged between the first prism 21 and the third prism 23. The first light-emitting element 11, the second light-emitting element 12, and the third light-emitting element 13 in the light source unit 10 are arranged to correspond to the first prism 21 in the color combination device 20, respectively. , The second prism 22 and the third prism 23 make the first path of monochromatic light 101 emitted through the first light-emitting element 11, the second light-emitting element 12, and the third light-emitting element 13 The second path of monochromatic light 102 and the third path of monochromatic light 103 are incident on the first prism 21, the second prism 22, and the third prism 23, respectively.

It is worth noting that in the above-mentioned embodiment of the present invention, as shown in FIG. 3, the structure of the second prism 22 and the third prism 23 can make the second monochromatic light 102 and the third The light angles of the monochromatic light 103 after entering the second prism 22 and the third prism 23 meet the total reflection condition, and are used to make the second monochromatic light 102 and the third monochromatic light 102 and the third monochromatic light The light 103 is totally reflected in the second prism 22 and the third prism 23 respectively to change the propagation direction of the second monochromatic light 102 and the third monochromatic light 103, so that the first monochromatic light The two monochromatic light 102 and the third monochromatic light 103 propagate toward the first film system 24 and the second film system 25, respectively.

As shown in FIG. 3, the first film system 24 is preferably used to reflect the second monochromatic light 102 and transmit the first monochromatic light 101 and the third monochromatic light 103; The second film system 25 is preferably used to reflect the third monochromatic light 103 and transmit the first monochromatic light 101. More preferably, the second film system 25 is used to reflect the third monochromatic light 103 and transmit the first monochromatic light 101 and the second monochromatic light.

In this way, as shown in FIG. 3, the first monochromatic light 101 from the first light-emitting element 11 can sequentially pass through the first prism 21, the second film system 25, and the third prism 23. , The first film system 24 and the second prism 24 then propagate along the color combination light path of the color combination device 20; the second path of monochromatic light 102 from the second light-emitting element 12 first Total reflection occurs in the second prism 22 to propagate to the first film system 24, and after being reflected by the first film system 24 back to the second prism 22, it passes through the second prism 22 and then propagate along the color combination light path of the color combination device 20; the third monochromatic light 103 from the third light-emitting element 13 first undergoes total reflection in the third prism 23 to propagate to all The second film system 25, after being reflected by the second film system 24 back to the third prism 23, passes through the third prism 23, the first film system 24, and the second prism 24 in sequence It then propagates along the color combination light path of the color combination device 20. In this way, the first path of monochromatic light 101, the second path of monochromatic light 102, and the third path of monochromatic light 103 emitted from the color combining device 20 are all along the back of the color combining device 20. The combined color light path propagates so that the first monochromatic light 101 from the first light-emitting element 11, the second monochromatic light 102 from the second light-emitting element 12, and the second monochromatic light 102 from the second light-emitting element 12 The third monochromatic light 103 of the three light-emitting elements 13 is synthesized into a combined color light (such as colored light) in the color combining device 20.

Exemplarily, in the above-mentioned embodiment of the present invention, as shown in FIG. 3, the first prism 21 has a first incident surface 211 and a first exit surface 212, wherein the first prism 21 has a The first incident surface 211 faces the first light emitting element 11, and the first exit surface 212 of the first prism 21 faces the second film system 25, so that the The first path of monochromatic light 101 can enter from the first incident surface 211 of the first prism 21, and after being emitted from the first exit surface 212 of the first prism 21, it is emitted toward the The second film system 25.

As shown in FIG. 3, the second prism 22 has a second incident surface 221 and a second exit surface 222, wherein the second exit surface 222 of the second prism 22 is a total reflection surface, and the The second incident surface 221 of the second prism 22 faces the second light-emitting element 12, so that the second path of monochromatic light 102 from the second light-emitting element 12 can pass from all the lights of the second prism 22 The second incident surface 221 is incident, and after total reflection occurs at the second exit surface 222 of the second prism 22, it is incident on the first film system 24.

As shown in FIG. 3, the third prism 23 has a third incident surface 231 and a third exit surface 232, and the third exit surface 232 is a total reflection surface, wherein the third light emitting element 13 corresponds to the The third incident surface 231 of the third prism 23 enables the third monochromatic light 103 from the third light-emitting element 13 to enter from the third incident surface 231 of the third prism 23, And after total reflection occurs at the third exit surface 232 of the third prism 23, it is emitted toward the second film system 25. The third prism 23 is disposed between the first prism 21 and the second prism 22, wherein the third exit surface 232 of the third prism 23 faces the second prism 22, and the first prism The first exit surface 212 of a prism 21 faces the third prism 23, so that the first monochromatic light 101 emitted from the first exit surface 212 of the first prism 21 first passes through the After the third prism 23 is emitted from the third emission surface 232, it passes through the second prism 22 to emit the color combination device 20 from the second emission surface 222.

As shown in FIG. 3, the first film system 24 for reflecting the second path of monochromatic light 102 is disposed on the third exit surface 232 of the third prism 23 and the second prism 22 In between, the second path of monochromatic light 102 totally reflected by the second exit surface 222 of the second prism 22 can be reflected by the first film system 24 back to the second prism 22, and The color combination device 20 is emitted from the second emission surface 222 of the second prism 22. In other words, when the second path of monochromatic light 102 first propagates to the second exit surface 222 of the second prism 22, it undergoes total reflection to propagate toward the first film system 24, and then propagates When it reaches the first film system 24, it is reflected to be reflected back to the second prism 22, and finally transmitted to the second exit surface 222 of the second prism 22 for the second time. The second prism 22. That is to say, the first film system 24 and the second prism 22 cooperate with each other to form a folded light path in the second prism 22, so that the second monochromatic light 102 is in the second prism 22 It propagates back and forth, thereby ensuring that the second monochromatic light 102 has a sufficiently long propagation path in the color combination device 20.

As shown in FIG. 3, the second film system 25 is used to reflect the third monochromatic light 103 and is arranged on the first exit surface 212 of the first prism 21 and the third prism 23 In between, the third monochromatic light 103 totally reflected by the third exit surface 232 of the third prism 23 can be reflected by the second film system 25 back to the third prism 23, and then After the third emission surface 232 of the third prism 23 is emitted, it passes through the second prism 22 to emit the color combination device 20 from the second emission surface 222 of the second prism 22. In other words, the third monochromatic light 103 first undergoes total reflection when it propagates to the third exit surface 232 of the third prism 23 for the first time to propagate toward the second film system 25, and then propagates to The second film system 25 is reflected to be reflected back to the third prism 23, and finally transmitted to the third exit surface 232 of the third prism 23 for the second time to emit the third prism 23 . In other words, the second film system 25 and the third prism 23 cooperate with each other to form a refracted light path in the third prism 23, so that the third monochromatic light 103 is propagated in the third prism 23 in a refracted manner. , Thereby ensuring that the third monochromatic light 103 has a sufficiently long propagation path in the color combining device 20.

In summary, as shown in FIG. 3, the color combination device 20 can be used to: irradiate all the light from the first light-emitting element 11 and from the first incident surface 211 of the first prism 21 The first path of monochromatic light 101 passes through the first prism 21, the second film system 25, the third prism 23, the first film system 24, and the second prism 22 in order, The second exit surface 222 of the second prism 22 emits; the second monochromatic color that comes from the second light-emitting element 12 and enters from the second entrance surface 221 of the second prism 22 The light 102 passes through the second prism 22 after being totally reflected by the second exit surface 222 of the second prism 22 and reflected by the first film system 24 to escape from the second prism 22 And the third path of monochromatic light 103 from the third light-emitting element 13 and incident from the third incident surface 231 of the third prism 23 is sequentially passed through After the third exit surface 232 of the third prism 23 is totally reflected and reflected by the second film system 25, it passes through the third prism 23, the second film system 24, and the second prism 22 in sequence , The first monochromatic light 101 and the first monochromatic light 101 emitted from the second emission surface 222 of the second prism 22 and emitted from the second emission surface 222 of the second prism 22 The two monochromatic lights 102 and the third monochromatic light 103 travel along the same optical path, so that the first monochromatic light 101, the first monochromatic light 101 and the third monochromatic light 103 emitted from the second exit surface 222 of the second prism 22 The second monochromatic light 102 and the third monochromatic light 103 are combined into one light.

It is worth noting that, in the above-mentioned example of the present invention, the first film system 24 may be, but not limited to, be implemented as a red light reflecting film for reflecting red light and transmitting blue and green light. The second film system 25 may, but is not limited to, be implemented as an anti-blue light film for reflecting blue light and transmitting red light and green light. Of course, in other examples of the present invention, the second film system 25 can also be implemented as other types of film systems, such as a green light-transmitting film, as long as it can ensure blue light reflection and green light transmission. Alternatively, the first film system 24 can also be implemented as the anti-blue light film; correspondingly, the second film system 25 is implemented as the red light reflective film.

In addition, the included angle between the second incident surface 221 and the second exit surface 222 of the second prism 22 is preferably greater than a first critical angle, so that the The second path of monochromatic light 102 vertically enters the second prism 22, that is, when the second path of monochromatic light 102 is perpendicular to the second incident surface 221, the second path of monochromatic light 102 is perpendicular to the second incident surface 221. The incident second path of monochromatic light 102 can undergo total internal reflection at the second exit surface 222 of the second prism 22. It is understandable that it is precisely because the second path of monochromatic light 102 enters the second prism 22 perpendicularly from the second incident surface 221, so that the second path of monochromatic light 102 can travel along a straight line. To the second exit surface 222 of the second prism 22, the second path of monochromatic light 102 will not be reflected or refracted at the second incident surface 221 of the second prism 22, which helps In order to reduce the light loss, the light energy utilization rate of the color combination device 20 is improved. In addition, the first critical angle of the present invention is implemented as the minimum incident angle when light is totally reflected at the second exit surface 222 of the second prism 22.

Similarly, the angle between the third incident surface 231 and the third exit surface 222 of the third prism 23 is preferably greater than a second critical angle, so that when the light from the third light-emitting element 13 The third monochromatic light 103 vertically enters the third prism 23, that is, when the third monochromatic light 103 is perpendicular to the third incident surface 231, it is incident perpendicularly from the third incident surface 231. The entering third path of monochromatic light 103 can cause total internal reflection at the third exit surface 232 of the third prism 23, which helps to reduce the incidence of the third path of monochromatic light 103 into the The light loss at the time of the third prism 23 further improves the light energy utilization rate of the color combination device 20. It can be understood that the second critical angle of the present invention is implemented as the minimum incident angle when light is totally reflected at the third exit surface 232 of the third prism 23.

In addition, in this example of the present invention, the included angle between the first incident surface 211 and the first exit surface 212 of the first prism 21 is less than a third critical angle to prevent The first monochromatic light 101 of the first light-emitting element 11 vertically enters the first prism 21, that is, when the first monochromatic light 101 is perpendicular to the first incident surface 211, from the The first path of monochromatic light 101 incident perpendicularly to the first incident surface 211 will not undergo total internal reflection at the first exit surface 212 of the first prism 21, so as to ensure that the first path of monochromatic light 101 The colored light 101 can be emitted from the first emission surface 212.

Preferably, the first incident surface 211 of the first prism 21 is parallel to the second exit surface 222 of the second prism 22, so as to ensure as far as possible the vertical incidence from the first incident surface 211 The first monochromatic light 101 can be emitted from the second exit surface 222 vertically. In other words, the color combination light path defined by the first prism 21 in the color combination device 20 is preferably perpendicular to the second exit surface 222 of the second prism 22 to ensure that the color combination is The first monochromatic light 101 propagating through the optical path is vertically emitted from the second exit surface 222, thereby reducing the light energy loss caused by reflection when the second prism 22 is emitted.

It is worth mentioning that, in some examples of the present invention, in order to reduce the loss of light energy caused by reflection, the color combination device 20 of the present invention may further include an anti-reflection film (not shown in the figure), wherein The anti-reflection film may be provided on the first incident surface 211 of the first prism 21, the second incident surface 221 of the second prism 22, and the third incident surface 221 of the third prism 23, respectively. The incident surface 231 is used to reduce the reflection of the first, second, and third

monochromatic lights

101, 102, 103 at the corresponding incident surfaces, which helps to improve the light energy utilization rate of the color combination device 20 . Of course, in other examples of the present invention, the anti-reflection film may be selectively disposed on the first exit surface 212 of the first prism 21 and the second exit surface 212 of the second prism 22, respectively. Surface 222 and the third exit surface 232 of the third prism 23 to further reduce the light energy loss of the first, second, and third

monochromatic lights

101, 102, 103 due to unnecessary reflections .

According to the above-mentioned embodiment of the present invention, as shown in FIG. 3, the second prism 22 of the color combination device 20 of the present invention further has a second functional surface 223, wherein the first prism 22 of the second prism 22 The second functional surface 223 corresponds to the third exit surface 232 of the third prism 23, and the first film system 24 is preferably plated on the second functional surface 223 of the second prism 22, so that The second functional surface 223 of the second prism 22 serves as a partially reflective surface for reflecting the second path of monochromatic light 102 at the second functional surface 223 of the second prism 22, and The second functional surface 223 of the second prism 22 transmits the first monochromatic light 101 and the third monochromatic light 103. It can be understood that in other examples of the present invention, the first film system 24 may also be provided on the second functional surface 223 of the second prism 22 by means such as attachment. No longer.

Preferably, the included angle between the second functional surface 223 of the second prism 22 and the second exit surface 222 is equal to the second incident surface 221 of the second prism 22 and the second exit surface 222. Half of the included angle between the exit surfaces 22 makes the second path of monochromatic light 102 incident perpendicularly from the second entrance surface 221 bend back (via the total reflection of the second exit surface 222 and pass through The reflection of the first film system 24 plated on the second functional surface 223 can be vertically emitted from the second exit surface 222. In other words, the color combination light path defined by the second prism 22 in the color combination device 20 is preferably perpendicular to the second exit surface 222 of the second prism 22, so as to ensure that it is along the color combination. The second monochromatic light 102 propagating through the optical path is all emitted perpendicularly from the second exit surface 222, thereby reducing the light energy loss caused by reflection when the second prism 22 is emitted.

Similarly, as shown in FIG. 3, the third prism 23 of the color combination device 20 of the present invention further has a third functional surface 233, wherein the third functional surface 233 of the third prism 23 corresponds to the The first exit surface 212 of the first prism 21, and the second film system 25 is preferably plated on the third functional surface 233 of the third prism 23, so that all of the third prism 23 The third functional surface 233 serves as a partially reflective surface for reflecting the third monochromatic light 103 at the third functional surface 233 of the third prism 23, and on the third prism 23 The three-function surface 233 transmits the first monochromatic light 101. It can be understood that, in other examples of the present invention, the second film system 25 may also be fixed to the third functional surface 233 of the third prism 23 by means such as attachment or bonding. The invention will not be repeated here. Of course, in another example of the present invention, the second film system 25 may also be fixed on the first exit surface 212 of the first prism 21 by means of coating, attaching, or the like.

Preferably, the third exit surface 232 of the third prism 23 is parallel to the second functional surface 233 of the second prism 22, and the first incident surface 231 perpendicularly enters from the third prism 22. The three-channel monochromatic light 103 can pass from the second film system 25 after being folded back (total reflection through the third exit surface 232 and reflection through the second film system 25 plated on the third functional surface 233). The emission surface 222 emits vertically. In other words, the color combination light path defined by the third prism 23 in the color combination device 20 is preferably perpendicular to the second exit surface 222 of the second prism 22 to ensure that it follows the color combination light path The propagated third monochromatic light 103 is vertically emitted from the second exit surface 222, thereby reducing the light energy loss caused by reflection when the second prism 22 is emitted.

Furthermore, in an example of the present invention, the second functional surface 223 of the second prism 22 may be laminated on the third exit surface 232 of the third prism 23 by gluing to The first film system 24 is positioned between the third exit surface 232 of the third prism 23 and the second functional surface 223 of the second prism 22.

It is worth noting that because the third exit surface 232 of the third prism 23 faces the first film system 24, and the second functional surface 223 of the second prism 22 and the first film system 24 are sequentially stacked on the third exit surface 232 of the third prism 23. Therefore, as shown in FIG. 3, the color combination device 20 of the present invention preferably further has an air gap 230, wherein the air A gap 230 is provided between the third exit surface 232 of the third prism 23 and the first film system 24, so as to ensure that the light incident from the third incident surface 231 of the third prism 23 The third monochromatic light 103 can be totally reflected at the third exit surface 232 of the third prism 23. In addition, since the second exit surface 222 of the second prism 22 does not need to be provided with any object, so that the second exit surface 222 of the second prism 22 can directly face the outside, the combination of the present invention The color device 20 does not need to specifically reserve a space outside the second exit surface 222 of the second prism 22 to ensure that the second exit surface 222 of the second prism 22 is implemented as a total reflection surface .

Preferably, when the color combination device 20 is manufactured, a glue can be applied to the edge of the third exit surface 232 of the third prism 23 to form the entire surface of the third prism 23 after the glue is cured. The adhesive layer between the third exit surface 232 and the first film system 24 and at the edge of the third exit surface 232, and forms the third exit surface 232 and the third exit surface 232 of the third prism 23 The air gap 230 between the first film system 24 and at the middle of the third exit surface 232, so that the third prism 23 and the first film system 24 are fixedly glued, while still being able to The air gap 230 is reserved between the third exit surface 232 of the third prism 23 and the first film system 24.

It is understandable that in other examples of the present invention, the present invention can also apply an optically thinner medium to the third exit surface 232 of the third prism 23, wherein the refractive index of the optically thinner medium is only smaller than that of the optical thinner. The refractive index of the third prism 23 (that is, the optically dense medium) can also ensure that the third exit surface 232 of the third prism 23 is implemented as a total reflection surface. For example, when the refractive index of the first film system 24 is less than the refractive index of the third prism 23, the first film system 24 may be plated on the third exit surface 232 of the third prism 23, and the same It can be ensured that the third monochromatic light 103 is totally reflected at the third exit surface 232 of the third prism 23.

It is worth noting that with the emergence of MicroLED display technology, it has become possible to miniaturize projection systems and near-eye display devices. First of all, MicroLED is to form a micron-pitch LED array after miniaturizing traditional LEDs to achieve ultra-high-density pixel resolution. That is to say, MicroLED is a high-density integrated micron-pitch LED array, and each LED pixel in the array Can be independently addressed and lit. In other words, each LED pixel in the MicroLED can emit light by itself, and image display can be realized through precise control of the luminous intensity of each LED, that is, the MicroLED can directly emit image light. Secondly, in addition to the characteristics of high brightness, ultra-high resolution, color saturation, and high luminous efficiency, MicroLEDs, more importantly, will not be affected by water vapor, oxygen or high temperature. Therefore, the MicroLEDs are stable and life-span , Working temperature and other aspects have obvious advantages. In addition, the power consumption of MicroLED is about 10% of LCD and 50% of OLED; compared with OLED, to achieve the same display brightness, only about 10% of the latter's coating area is needed. In summary, the aforementioned advantages of the MicroLED determine that it will have a wide range of applications in the field of micro-projection, especially near-eye display, and augmented reality.

However, the full-colorization of MicroLED has always been a bottleneck hindering its development, because three-color arrays such as RGB need to install red, blue, and green dies in stages, and hundreds of thousands of LED dies need to be embedded. This has higher requirements for the light efficiency, wavelength consistency, and yield of the LED die. In addition, the expenditure on the chromatic aberration of the LED is also a bottleneck hindering the technology. However, for monochromatic MicroLEDs, there will not be many such problems, because the monochromatic MicroLEDs can be assembled through flip-chip packaging and driver IC bonding. Therefore, in order to realize the color display of the micro-projection light engine, it is necessary to combine the image light emitted by the monochromatic MicroLEDs of different colors through the color combination device.

According to the above-mentioned embodiment of the present invention, the first, second, and third light-emitting

elements

11, 12, and 13 of the light source unit 10 of the lighting system 1 are preferably implemented as monochromatic MicroLEDs of different colors. Of course, in other examples of the present invention, the first, second, and third light-emitting

elements

11, 12, 13 can also be implemented, but are not limited to, such as monochromatic LCOS, monochromatic LCD, monochromatic DMD, monochromatic OLED and other types of array light-emitting elements.

It is worth noting that when the first, second, and third light-emitting

elements

11, 12, and 13 are sequentially implemented as green MicroLED, red MicroLED, and blue MicroLED, the first, second, and third way The color lights 101, 102, and 103 are sequentially implemented as green image light, red image light, and blue image light.

In the above-mentioned embodiment of the present invention, preferably, based on the return light path in the color combination device 20, the first prism 21, the second prism 22, and the third prism in the color combination device 20 The size of 23 is matched and designed so that the optical paths of the first, second, and third

monochromatic lights

101, 102, 103 in the color combination device 20 are equal to minimize aberrations. It helps to improve the projection quality of the projection system equipped with the illumination system 1. It can be understood that the optical path mentioned in the present invention is equal to the product of the physical path of light and the refractive index of the current propagation medium (such as the first, second and

third prisms

21, 22, 23).

In addition, the positions of the first, second, and third light-emitting

elements

11, 12, and 13 in the light source unit 1 relative to the color combination device 20 can be calibrated so that the first, second, and third light-emitting elements The three

monochromatic lights

101, 102, 103 can be emitted from the same position and in the same direction on the second exit surface 222 of the second prism 22, that is, from the second prism 22 The first monochromatic light 101, the second monochromatic light 102, and the third monochromatic light 103 emitted from the second exit surface 222 propagate along the same optical path to achieve uniform color. It helps to improve the color projection quality of the projection system equipped with the illumination system 1.

It is worth mentioning that, in the above-mentioned embodiment according to the present invention, since the first monochromatic light 101 propagates approximately linearly in the color combining device 20, the second and third monochromatic light The

lights

102 and 103 respectively travel back and forth in the color combination device 20. Therefore, in order to make the first, second, and third

monochromatic lights

101, 102, 103 in the color combination device 20 The length is equal, and the size of the first prism 21 of the present invention in the propagation direction of the first monochromatic light 101 is relatively large.

In order to reduce the size of the first prism 21, FIGS. 4A and 4B show a first modified implementation of the color combination device 20 of the lighting system 1 according to the above-mentioned embodiment of the present invention, wherein The first prism 21 of the color combining device 20 further has a first functional surface 213, wherein the first functional surface 213 of the first prism 21 is used to reflect the first monochromatic light 101, Therefore, the first monochromatic light 101 incident from the first incident surface 211 of the first prism 21 is first reflected at the first functional surface 213 to propagate in a reflexive manner, and then from the The first exit surface 212 of the first prism 21 emits light. In this way, the first path of monochromatic light 101 will be propagated in the color combining device 20 to ensure that the optical path of the first path of monochromatic light 101 in the color combining device 20 remains unchanged. In the case of, the size of the first prism 21 is reduced, thereby reducing the volume and size of the color combination device 20 and the lighting system 1.

More specifically, in this modified embodiment of the present invention, as shown in FIG. 4B, the first functional surface 213 of the first prism 21 is a total reflection surface, so that all the light from the first light-emitting element 11 The first path of monochromatic light 101 can first enter from the first incident surface 211 of the first prism 21, and after being totally reflected at the first functional surface 213 of the first prism 21, Then it is emitted from the first exit surface 212 of the first prism 21 to realize that the first monochromatic light 101 propagates back and forth in the color combination device 20 by means of total reflection, thereby ensuring that the The small volume of the first prism 21 provides a sufficiently long optical path for the first monochromatic light 101.

Preferably, the included angle between the first incident surface 211 of the first prism 21 and the first functional surface 213 is greater than a third critical angle, so that when the first light emitting element 11 comes from the The first monochromatic light 101 vertically enters the first prism 21, that is, when the first monochromatic light 101 is perpendicular to the first incident surface 211, it is incident perpendicularly from the first incident surface 211 The incoming first monochromatic light 101 can be totally internally reflected at the first functional surface 213 of the first prism 21. It is understandable that it is precisely because the first path of monochromatic light 101 enters the first prism 21 perpendicularly from the first incident surface 211, so that the first path of monochromatic light 101 can travel along a straight line. To the first functional surface 213 of the first prism 21, the first monochromatic light 101 does not reflect and refract at the first incident surface 211 of the first prism 21, which helps In order to reduce the light loss, the light energy utilization rate of the color combination device 20 is improved. In addition, the third critical angle of the present invention is implemented as the minimum incident angle when light is totally reflected at the first functional surface 213 of the first prism 21.

More preferably, the first prism 21 can be implemented as a total reflection prism, that is, the angle between the first incident surface 211 of the first prism 21 and the first functional surface 213 is Equal to 45°, and the first incident surface 211 of the first prism 21 is perpendicular to the first exit surface 212, so that the first path of monochromatic light incident perpendicularly from the first incident surface 211 After the light 101 is totally reflected by the first functional surface 213, it exits vertically from the first exit surface 212 to minimize the first path of monochromatic light 101 caused by the first incident surface. 211 and the first exit surface 212 reflect light energy loss caused by reflection.

It is worth noting that FIG. 5 shows a second modified implementation of the color combination device of the lighting system according to the above-mentioned embodiment of the present invention. Specifically, compared with the first modified embodiment according to the present invention, the color combination device 20 according to the second modified embodiment of the present invention is different in that: the color combination device 20 further includes a third The film system 26 is used to reflect the first path of monochromatic light 101, wherein the third film system 26 is correspondingly disposed on the first prism 21, so that all light incident from the first incident surface 211 The first path of monochromatic light 101 is emitted from the first exit surface 212 after being reflected by the third film system 26.

In other words, as shown in FIG. 5, the first functional surface 213 of the first prism 21 is not a total reflection surface, and the third film system 26 is preferably plated on the first prism 21 A functional surface 213, so that the first path of monochromatic light 101 at the first functional surface 213 of the first prism 21 does not undergo total internal reflection but specular reflection. It can be understood that in other examples of the present invention, the third film system 26 may also be attached to the first functional surface 213 of the first prism 21 by pasting, attaching, or the like.

More preferably, the third film system 26 is implemented as a specular reflection film for simultaneously reflecting all light such as the first, second, and third

monochromatic lights

101, 102, 103, etc., It helps to avoid external light from affecting the color combination of the color combination device 20. Of course, in other examples of the present invention, the third film system 26 can also be implemented as a partially reflective film such as a green light-reflecting film (reflecting green light and transmitting red and blue light), etc., as long as it can It suffices to reflect the first monochromatic light 101, which will not be repeated in the present invention.

It is worth mentioning that, in order to further reduce the volume and weight of the color combination device 20, FIG. 6 shows a third modified embodiment of the color combination device of the lighting system according to the above-mentioned embodiment of the present invention. , Wherein the color combination device 20 omits the first prism 21, and the first light-emitting element 11 directly corresponds to the second film system 25, that is, the second film system 25 is located in the Between the first light-emitting element 11 and the third prism 23, the first monochromatic light 101 from the first light-emitting element 11 sequentially passes through the second film system 25, the third prism 23, The first film system 24 and the second prism 21 are used to emit the color combining device 20, which can also combine the first, second, and third

monochromatic lights

101, 102, 103 of different paths. Light all the way.

In other words, as shown in FIG. 6, the first film system 24 is located between the second prism 22 and the third prism 23, and the third prism 23 is located between the second film system 25 and the first prism 23. Between the film systems 24, the first light-emitting element 11, the second light-emitting element 12, and the third light-emitting element 13 correspond to the second film system 25, the second prism 22, and the The third prism 23.

In this way, as shown in FIG. 6, the first monochromatic light 101 from the first light-emitting element 11 can sequentially pass through the second film system 25, the third prism 23, and the first film system. 24 and the second prism 24 to emit the color combination device 20; the second monochromatic light 102 from the second light-emitting element 12 is first totally reflected in the second prism 22 to propagate to The first film system 24, after being reflected by the first film system 24 back to the second prism 22, passes through the second prism 22 to emit the color combination device 20; The third monochromatic light 103 of the three light-emitting element 13 is firstly totally reflected in the third prism 23 to propagate to the second film system 25, and is reflected by the second film system 24 back to the After the third prism 23, it passes through the third prism 23, the first film system 24, and the second prism 24 in order to emit the color combination device 20, and emits the first color combination device 20 One monochromatic light 101, the second monochromatic light 102, and the third monochromatic light 103 travel along the same optical path, so that the first monochromatic light from the first light-emitting element 11 101. The second monochromatic light 102 from the second light-emitting element 12 and the third monochromatic light 103 from the third light-emitting element 13 are combined in the color combination device 20. Combined color light (such as colored light).

It is understandable that in this modified embodiment of the present invention, although the color combination device 20 does not include the first prism 21, the weight and volume of the color combination device 20 can be greatly reduced, but The optical path of the first monochromatic light 101 propagating in the color combining device 20 is also reduced accordingly. Therefore, compared with the above-mentioned embodiment according to the present invention, according to the third modified embodiment of the present invention In the lighting system 1, the linear distance between the first light-emitting element 11 and the third prism 23 has to be increased to ensure the first, second and third

monochromatic lights

101, 102, The light path of 103 in the lighting system 1 is kept consistent.

It is worth noting that in other modified examples of the present invention, the color combination device 20 may also use a mirror to replace the first color combination device 20 in the first modified embodiment of the present invention. The prism 21, wherein the reflecting mirror is used to reflect the first monochromatic light 101 from the first light-emitting element 11, so that the reflected first monochromatic light 101 faces the second monochromatic light 101 The film system 25 propagates and sequentially passes through the second film system 25, the third prism 23, the first film system 24, and the second prism 24 to emit the color combination device 20, which can also make the emission The first monochromatic light 101, the second monochromatic light 102, and the third monochromatic light 103 of the color combining device 20 travel along the same optical path. It is understandable that, in this example of the present invention, the color combination device 20 changes the propagation direction of the first monochromatic light 101 through the reflector, so that the first light-emitting element 11 and the The linear distance between the third prisms 23 is shortened, which helps to reduce the overall volume of the illumination system 1.

According to another aspect of the present invention, the present invention further provides a color combination method for synthesizing three monochromatic lights into one light. Specifically, as shown in FIG. 7, the color combination method includes the steps:

S100: The second path of monochromatic light 102 and the third path of monochromatic light 103 are respectively totally reflected to change the propagation direction of the second path of monochromatic light 102 and the third path of monochromatic light 103; and

S200: Reflect the second path of monochromatic light 102 and the third path of monochromatic light 103 respectively after being totally reflected, so as to change the second path of monochromatic light 102 and the third path of monochromatic light again The propagation direction of 103 enables the second monochromatic light 102 and the third monochromatic light 103 to simultaneously propagate along the same optical path as the first monochromatic light 101 after being turned twice.

It is worth noting that, as shown in FIG. 7, in another example of the present invention, the color combination method further includes the steps:

S300: Reflect the first monochromatic light 101 to change the propagation direction of the first monochromatic light 101, so that the second monochromatic light 102 and the third monochromatic light 103 are in two directions. After the second turn, it simultaneously propagates along the same optical path with the first monochromatic light 101 after being reflected.

It is worth mentioning that at present, the Micro LED array is a high-density integrated LED array with a pitch of the order of microns, and each Micro LED in the Micro LED array as a pixel can be independently addressed Illuminate to emit pixel beams, so that the Micro LED array can emit corresponding image light according to display requirements (that is, the image light is composed of pixel beams arranged in an array). Since the distance between adjacent Micro LEDs is extremely small, and the pixel beams emitted by the Micro LEDs usually have a certain divergence angle, there is a stray light effect in the Micro LED array. Therefore, when the Micro LEDs When the array is directly applied to a micro-projection system to form a micro-projection system based on Micro LED, it will not only reduce the light efficiency of the system, but also seriously affect the image quality of the system.

In order to improve the light energy utilization rate and image quality of the Micro LED-based micro projection system, the present invention provides a Micro LED display device, which can provide image light after collimation processing. Specifically, as shown in FIGS. 8 to 10, 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 collimation array 20 ', wherein the micro-collimation array 20' is stacked on the Micro LED array 10' for collimating the image light emitted through the Micro LED array 10', so that the Micro LED display device 1'can provide collimated image light to improve the light energy utilization and image quality of the Micro LED-based micro projection system.

More specifically, as shown in FIGS. 8 and 9, 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 LED 11' has a light emitting The path is used to emit pixel beams along the light-emitting path. The micro-collimation array 20' includes a plurality of micro-collimation elements 21' arranged in an array, and the plurality of micro-collimation elements 21' are respectively correspondingly arranged on the light emitting of the corresponding Micro LED 11' The path is used to collimate the pixel beam emitted through the Micro LED 11' to reduce the divergence angle of the pixel beam. It is understandable that in the present invention, 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 beam remain substantially parallel, so even The distance between the adjacent Micro LED 11 ′ in the Micro LED array 10 ′ of the Micro LED display device 1 ′ is extremely small (up to the order of micrometers), but the light emitted by the adjacent Micro LED 11 ′ The pixel beams will not interfere with each other after being collimated, which can not only avoid causing stray light effects, but also can improve the light energy utilization rate and image quality of the Micro LED-based micro projection system.

It is worth noting that, as shown in FIGS. 8 and 9, 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 energized. It is integrated on the circuit board 12' to control the addressing and lighting of the plurality of Micro LEDs 11'.

In addition, in an example of the present invention, as shown in FIGS. 9 and 10, preferably, the micro collimating element 21' of the micro collimating array 20' and the micro LED array 10' There is a one-to-one correspondence between the Micro LED 11', that is, one micro collimating element 21' in the micro collimating array 20' corresponds to one Micro LED 11 in the Micro LED array 10', so that each Micro LED 11' emits light There is only one micro collimating element 21' in the path, so as to collimate the pixel beam emitted by the corresponding Micro LED 11' through the micro collimating element 21', thereby reducing the emission angle of each pixel light and reducing Stray light effect. Of course, in other examples of the present invention, the micro collimating element 21' of the micro collimating array 20' and the Micro LED 11' of the Micro LED array 10' may not have a one-to-one correspondence, for example: One micro collimating element 21' can correspond to two or more Micro LEDs 11, so that the volume of the micro collimating element 21' can be increased, so as to reduce the manufacturing difficulty of the micro collimating element 21'.

It is worth mentioning that in the above-mentioned embodiment of the present invention, as shown in FIGS. 9 and 10, the micro-collimation array 20' further includes a transparent substrate 22', wherein the plurality of micro-collimation elements 21' are arrayed on the light-transmitting substrate 22' to form the micro-collimation array 20' with an integrated structure, so that the micro-collimation array 20' in the micro-collimation array 20' While the straight element 21' is quickly stacked on the Micro LED array 10', it is ensured that the micro collimator 21' corresponds to the Micro LED 11' one-to-one.

Preferably, as shown in FIG. 10, the plurality of micro-collimation elements 21' and the light-transmitting substrate 22' are integrally connected to form the micro-collimation array 20' with an integrated structure, which helps The multiple micro collimating elements 21' are firmly stacked on the Micro LED array 10'.

Exemplarily, as shown in FIG. 9 and FIG. 10, the micro collimating element 21' of the micro collimating array 20' can be, but not limited to, implemented as a micro collimating lens 211', wherein the micro collimating lens 211' The straight lens 211' integrally extends upward from the upper surface 221' of the light-transmitting substrate 22' to form an array-distributed micro-convex lens structure on the upper surface 221' of the light-transmitting substrate 22', and then pass through the The micro collimator lens 211' collimates the pixel beam emitted through the corresponding Micro LED 11'.

It is worth noting that, as shown in FIG. 10, since the plurality of micro collimator lenses 211' are all distributed on the upper surface 221' of the light-transmitting substrate 22', the lower surface 222 of the light-transmitting substrate 22' 'It can still be kept flat, so the plurality of micro collimator lenses 211' can be quickly and securely mounted on the Micro LED array 10' through the light-transmitting substrate 22', so that the micro LED array The pixel light beams emitted by the Micro LED 11 ′ in 10 ′ can sequentially pass through the light-transmitting substrate 22 ′ and the micro collimating lens 211 ′, so as to realize the collimation processing of the pixel light beams.

In addition, the surface type of the micro collimator lens 211' can be, but is not limited to, implemented as one of a free-form surface type, a spherical surface type, and an aspheric surface type.

It is worth mentioning that, according to the above-mentioned embodiment of the present invention, as shown in FIG. 10, the light-transmitting substrate 22' of the micro-collimation array 20' has a plurality of receiving grooves 220', wherein the plurality of receiving grooves 220' Grooves 220' are arranged in an array on the lower surface 222' of the light-transmitting substrate 22', and the receiving grooves 220' correspond to the micro collimating elements 21' in a one-to-one manner, so that the micro-collimating array When 20' is stacked on the Micro LED array 10', the light-transmitting substrate 22' can accommodate the corresponding Micro LED 11', which helps protect the Micro LED 11' while reducing the The thickness of the Micro LED display device 1'.

It is worth noting that it is precisely because the receiving groove 220' of the light-transmitting substrate 22' corresponds to the micro collimating element 21' one-to-one, therefore, when the Micro LED 11' can be correspondingly received in the corresponding In the receiving groove 220', the micro collimating element 21' can correspond to the corresponding Micro LED 11' so as to be located in the light emitting path of the Micro LED 11'. In this way, the receiving groove 220' of the light-transmitting substrate 22' can not only protect the Micro LED 11', but also have a good positioning effect, so as to reduce the difficulty of assembling the Micro LED display device 1'.

In addition, in the above-mentioned embodiment of the present invention, as shown in FIG. 10, the Micro LED display device 1'may further include an adhesive layer 30', wherein the adhesive layer 30' is disposed on the Micro LED. Between the circuit board 11' of the array 10' and the light-transmitting substrate 22' of the micro-collimation array 20' to connect the micro-collimation array 20' through the adhesive layer 30' It is firmly stacked on the Micro LED array 10'.

Exemplarily, as shown in FIG. 10, an adhesive is first applied to the lower surface 222' of the light-transmitting substrate 22' of the micro-collimation array 20', and then the micro-collimation array 20 is applied. 'Correspondingly stacked on the Micro LED array 10', so that the adhesive is on the light-transmitting substrate 22' of the micro collimation array 20' and the circuit board of the Micro LED array 10' 12', to form between the light-transmitting substrate 22' of the micro-collimation array 20' and the circuit board 12' of the Micro LED array 10' after the adhesive is cured The adhesive layer 30' and the Micro LED 11 are exposed outside the adhesive layer 30' to complete the manufacture of the Micro LED display device 1'. It is understandable that, in other examples of the present invention, the adhesive can also be applied to the circuit board 12' of the Micro LED array 10' first, or at the same time on the micro-collimation array 20'. Adhesives are applied to the light-transmitting substrate 22' and the circuit board 12' of the Micro LED array 10', as long as the micro-collimation array 20' can be bonded to the Micro LED The array is 10'.

It is worth noting that the distance between the 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 LED 11' when applying the adhesive. Therefore, in order to prevent the adhesive from interfering with the pixel beam emitted by the Micro LED 11', the adhesive layer 30' of the present invention is preferably cured by a light-transmitting adhesive.

Specifically, in other examples of the present invention, the adhesive layer 30' may also be provided on the Micro LED 11' of the Micro LED array 10' and the light-transmitting of the micro collimating array 20' Between the substrates 22', the micro-collimation array 20' can still be firmly stacked on the Micro LED array 10' through the adhesive layer 30'.

Illustratively, FIGS. 11A and 11B show a first modified embodiment of the Micro LED display device 1'according to the above-mentioned embodiment of the present invention, wherein the adhesive layer 30' is coated on the Micro LED display device 1'. The Micro LED 11' of the LED array 10' can be protected by the adhesive layer 30' while the micro collimator array 20' is firmly attached to the Micro LED array 10' The Micro LED11'. It can be understood that, in this modified embodiment of the present invention, the light-transmitting substrate 22' of the micro-collimation array 20' does not need to be provided with the receiving groove 220', but passes through the adhesive layer 30' is directly bonded to the Micro LED array 10'.

It is worth noting that since the adhesive layer 30' directly covers the Micro LED 11' of the Micro LED array 10', the present invention can be applied to the circuit board 12' of the Micro LED array 10' The adhesive is directly applied to the entire surface, and the adhesive covers the Micro LED 11 ′, which helps to reduce the difficulty of manufacturing the Micro LED display device 1 ′.

It is worth mentioning that FIGS. 12A and 12B show a second modified implementation of the Micro LED display device according to the above-mentioned embodiment of the present invention. Specifically, as shown in FIG. 12A, compared with the above-mentioned embodiment according to the present invention, the difference between the Micro LED display device 1'according to the second modified embodiment of the present invention is: the Micro LED display device The micro collimating element 21 ′ of the micro collimating array 20 ′ of 1 ′ is implemented as a cone rod 212 ′, so that the micro collimating array 20 ′ forms a cone rod array. The cone rod 212' has a light entrance end 2121' and a light exit end 2122', and the size of the light entrance end 2121' of the cone rod 212' is smaller than the light exit end 2122 of the cone rod 212' 'Size, wherein the light entrance end 2121' of the cone rod 212' is located close to the Micro LED 11 of the Micro LED array 10', and the light exit end 2122' of the cone rod 212' Located at a position far away from the Micro LED 11 ′ of the Micro LED array 10 ′, so that the pixel beams emitted by the Micro LED 11 ′ sequentially pass through the light entrance end 2121 ′ and the light exit end 2121 ′ of the cone rod 212 ′ The end 2122' is collimated to reduce the divergence angle of the pixel beam.

Furthermore, in this modified embodiment of the present invention, as shown in FIG. 12B, the light incident end 2121' of the tapered rod 212' is directly attached to the correspondingly through the adhesive layer 30'. The Micro LED 11' of the Micro LED array 10'. It is worth noting that because the light incident end 2121' of the cone rod 212' usually has a flat end surface, the present invention can directly fix the cone rod 212' firmly through the adhesive layer 30' For the Micro LED 11 ′, to ensure that the cone rod 212 ′ is correspondingly located in the light emitting path of the Micro LED 11 ′.

In addition, in this modified embodiment of the present invention, as shown in FIG. 12B, the light-transmitting substrate 22' of the micro-collimation array 20' may be, but not limited to, be integrally connected to all the tapered rods 212'. The light end 2122' is described to form the Micro LED array 10' with an integrated structure. In other words, the cone rods 212' integrally extend downward from the lower surface 222' of the light-transmitting substrate 22', and the plurality of cone rods 212' are located under the light-transmitting substrate 22'. The array is distributed on the surface 222'.

It is worth noting that in this modified embodiment of the present invention, since the upper surface of the cone-rod array (that is, the upper surface of the light-transmitting substrate 22') is flat, and the cone-rod array The bottom surface (that is, the end surface of the light incident end 2121' of the cone rod 212') is located on the same plane, so the cone rod array can be conveniently packaged to reduce the packaging cost of the Micro LED display device 1' .

13A and 13B show a third modified implementation of the Micro LED display device according to the above-mentioned embodiment of the present invention. Specifically, compared with the above-mentioned embodiment according to the present invention, the difference of the Micro LED display device 1'according to the third modified embodiment of the present invention is: the micro LED display device 1' The micro collimating element 21' of the collimating array 20' is implemented as a Fresnel lens 213' to collimate the pixel beams emitted by the corresponding Micro LED 11' through the Fresnel lens 213' Processing to obtain a better collimation effect. In other words, in this example of the present invention, the micro-collimating array 20' is implemented as a Fresnel lens array for collimating the image light emitted by the Micro LED array 10' to reduce the light of the system. Energy loss and stray light effects.

14A and 14B show a third modified implementation of the Micro LED display device according to the above-mentioned embodiment of the present invention. Specifically, compared with the above-mentioned embodiment according to the present invention, the difference of the Micro LED display device 1'according to the third modified embodiment of the present invention is: the micro LED display device 1' The micro collimating element 21' of the collimating array 20' is implemented as a total internal reflection lens 214' (hereinafter referred to as TIR lens 214') for collimating processing through total internal reflection to emit via the Micro LED 11' Pixel beam.

More specifically, as shown in FIG. 14B, the TIR lens 214' has an inner cavity 2140', wherein the Micro LED 11' is accommodated in the inner cavity 2140' of the TIR lens 214' so as to The pixel beam is emitted in the inner cavity 2140', so that the pixel beam first propagates in the inner cavity 2140', and then undergoes total internal reflection when passing through the TIR lens 214', so as to achieve a collimation effect. It is understandable that since the pixel beam emitted by the Micro LED 11' is totally internally reflected in the TIR lens 214', the TIR lens 214' can collimate the pixel beam while also being able to maximize The light energy loss is reduced to improve the light energy utilization rate of the Micro LED-based micro projection system.

In particular, since the Micro LED 11' is located within the corresponding inner cavity 2140' in the TIR lens 214', the TIR lens 214' can not only protect the Micro LED 11' from damage, but also The positioning of the Micro LED array 10' and the micro collimating array 20' is achieved through the inner cavity 2140' of the TIR lens 214', so as to ensure that the TIR lens 214' and the Micro LED are one-to-one. correspond.

According to another aspect of the present invention, the present invention further provides a micro-projection system, as shown in FIG. 15, wherein the micro-projection system includes at least one Micro LED display device 1'and a projection system body 400', wherein the The Micro LED display device 1'is correspondingly disposed on the projection system body 400', and is used to provide image light for the projection system body 400' so that the image light emitted by the Micro LED display device 1'can be projected Imaging to realize the 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 an imaging system such as an imaging lens group, a near-eye display device, an augmented reality device, etc., which can be configured. The equipment or system of the Micro LED display device 1'. Those skilled in the art can understand that, although the projection system body 400' is implemented as an imaging lens group in FIG. 15 as an example, it does not constitute a limitation to the content and scope of the present invention.

According to another aspect of the present invention, the present invention further provides a manufacturing method of a Micro LED display device for providing collimated image light. Specifically, as shown in FIG. 16, the manufacturing method of the Micro LED display device includes the steps:

S100': Provide a Micro LED array 10' and a micro collimation array 20', wherein the Micro LED array 10' includes a circuit board 12' and a plurality of Micro LEDs 11', wherein the plurality of Micro LEDs 11' can be It is energized and integrated on the circuit board 12', and the plurality of Micro LEDs 11' are arranged in an array on the circuit board 12', wherein the Micro LEDs 11' have a light-emitting path for following the light-emitting path Emit pixel beams; and

S200': correspondingly superimpose the micro-collimation array 20' on the Micro LED array 10', so that the micro-collimation array 20' pairs the pixels emitted by the Micro LED 11' in the Micro LED array 10' The beam is collimated.

It is worth noting that, in this embodiment of the present invention, the Micro LED array 10' includes a plurality of arrays of Micro LED 11', and the micro collimation array 20' includes a plurality of arrays of micro collimation elements. 21', wherein the Micro LED 11' corresponds to the micro collimating element 21' in a one-to-one correspondence, so that the micro collimating element 21' collimates the pixel light beam emitted through the corresponding Micro LED 11'.

It is worth mentioning that, in an example of the present invention, as shown in FIG. 16, the manufacturing method of the Micro LED display device further includes the steps:

S300': Apply an adhesive between the micro-collimation array 20' and the Micro LED array 10' to form and fix the micro-collimation array 20' after the adhesive is cured The adhesive layer 30' on the Micro LED array 20'.

It is worth noting that with the emergence of micro-light-emitting diode (hereinafter referred to as Micro LED) display technology, it is possible to miniaturize near-eye display devices. First of all, Micro LED display technology is to miniaturize traditional LEDs to form a micron-pitch LED array to achieve ultra-high-density pixel resolution. In other words, the Micro LED array is a high-density integrated micron-pitch LED array. Each LED can be used as a pixel to be independently addressed and lit. In other words, each LED pixel in the Micro LED array can emit light by itself, and image display can be realized through precise control of the luminous intensity of each LED, that is, the Micro LED array can directly emit image light. Secondly, in addition to the characteristics of high brightness, ultra-high resolution, color saturation, and high luminous efficiency, Micro LEDs, more importantly, are not affected by water vapor, oxygen or high temperature. Therefore, Micro LEDs are stable and useful It has obvious advantages in terms of life span and working temperature. In addition, the power consumption of Micro LED is about 10% of LCD and 50% of OLED. Compared with OLED, to achieve the same display brightness, only about 10% of the coating area of the latter is required. In summary, the above-mentioned advantages of Micro LED display technology determine that it will have a wide range of applications in the field of micro-projection, especially near-eye display, and augmented reality.

Referring to FIG. 18 and FIG. 19 of the accompanying drawings of the specification, the micro-projection light engine based on Micro LED according to the first embodiment of the present invention is illustrated. Specifically, as shown in FIG. 18, the Micro LED-based micro projection light engine 1" includes a Micro LED display device 10" and an imaging lens group 20", wherein the Micro LED display device 10" is used to provide images The light 100", wherein the imaging lens group 20" is correspondingly disposed on the Micro LED display device 10", and is used to project and image the image light 100" from the Micro LED display device 10".

It is worth noting that it is precisely because the Micro LED display device 10" of the Micro LED-based micro projection light engine 1" can directly provide the image light 100", it is compared with the existing micro projection light engine. 1P', the micro-LED-based micro-projection light engine 1" of the present invention does not require additional display chip 13P' and relay lens group 12P', so that the volume and weight of the micro-LED-based micro-projection light engine 1" Can be greatly reduced.

More specifically, in the above-mentioned first embodiment of the present invention, as shown in FIG. 19, the Micro LED display device 10" includes a Micro LED array 11", wherein the Micro LED array 11" may include a plurality of Micro LED arrays 11". LED111" and a circuit board 112", wherein the plurality of Micro LEDs 111" are energized and integrated on the circuit board 112", and the plurality of Micro LEDs 111" are arrayed on the circuit board 112". The Micro LED 111" has a light-emitting path for emitting pixel beams along the light-emitting path; the circuit board 112" is used to control the addressing and lighting of the plurality of Micro LEDs 11", so that the Micro LED array 11" The image light 100" can be emitted, and the image light 100" can be directly provided by the Micro LED display device 10". It is understandable that the image light 100" provided by the Micro LED display device 10" can be implemented as a combination of pixel light beams emitted by a plurality of the Micro LED 111" in the Micro LED array 11" set.

It is worth noting that the distance between the adjacent Micro LED 111" is extremely small, and the pixel beams emitted by the Micro LED 111" usually have a certain divergence angle, so that there is noise in the Micro LED array 11". Astigmatism effect. Therefore, when the Micro LED array 11" is directly configured on the micro-projection light engine to form the Micro LED-based micro-projection light engine 1", it will not only reduce the light efficiency of the system, but also seriously affect The image quality of the system.

Therefore, as shown in FIGS. 18 and 19, the Micro LED display device 10" of the present invention further includes a micro collimation array 12", wherein the micro collimation array 12" is stacked on the Micro LED array 11", used to collimate the image light 100" emitted through the Micro LED array 11", so that the Micro LED display device 1" can provide collimated image light 100", so as to improve the The light energy utilization and image quality of Micro LED's micro projection light engine 1".

Furthermore, the micro-collimation array 12" includes a plurality of micro-collimation elements 121" arranged in an array, and the plurality of micro-collimation elements 121" are respectively correspondingly arranged on the corresponding Micro LED 111" The light-emitting path is used to collimate the pixel beam emitted through the Micro LED 111" to reduce the divergence angle of the pixel beam. It is understandable that in the present invention, due to the micro-collimating element The divergence angle of the pixel light after 121" collimation is reduced, so that the light rays in the collimated pixel beam remain basically parallel, so even if the adjacent Micro LED 111" in the Micro LED array 11" The distance is very small (up to the order of micrometers), but the pixel beams emitted by the adjacent Micro LED111" will not interfere with each other after being collimated, which can not only avoid causing stray light effects, but also improve the The light energy utilization rate and image quality of the micro-projection light engine 1" based on Micro LED are described.

Preferably, the micro collimating element 121" of the micro collimating array 12" corresponds to the Micro LED 111" of the Micro LED array 11" in a one-to-one correspondence, that is, the micro collimating array 12" One micro-collimating element 121" in the Micro LED array 11" corresponds to one Micro LED 111" in the Micro LED array 11", so that there is only one micro-collimating element 121" in the light-emitting path of each Micro LED 111" to pass the micro-collimation The straightening element 121" collimates the pixel light beams emitted through the corresponding Micro LED 111", thereby reducing the emission angle of each pixel light and reducing the stray light effect. Of course, in other examples of the present invention, the micro collimating element 121" of the micro collimating array 12" and the Micro LED 111" of the Micro LED array 11" may not have a one-to-one correspondence, for example: One micro collimating element 121" can correspond to two or more Micro LED 111", so that the volume of the micro collimating element 121" can be increased, so as to reduce the manufacturing difficulty of the micro collimating element 121".

It is worth mentioning that due to the extremely small size of the single micro collimating element 121", it is difficult for the micro collimating element 121" to be positioned so as to maintain a one-to-one correspondence with the Micro LED 11". In the above-mentioned first embodiment of the invention, the micro-collimation array 12" further includes a light-transmitting substrate 122", wherein the plurality of micro-collimation elements 121" are arrayed on the light-transmitting substrate 122", In order to form the micro-collimation array 12" with an integral structure, the micro-collimation elements 121" in the micro-collimation array 12" are quickly stacked on the Micro LED array 11 While maintaining the one-to-one correspondence between the micro collimating element 121" and the Micro LED 111".

Preferably, as shown in FIG. 19, the plurality of micro-collimation elements 121" and the light-transmitting substrate 122" are integrally connected to form the micro-collimation array 12" with an integrated structure, which helps The multiple micro-collimating elements 121" are conveniently and reliably stacked on the Micro LED array 11".

Exemplarily, as shown in FIG. 19, the micro collimating element 121" of the micro collimating array 12" can be, but not limited to, implemented as a micro collimating lens 1211", wherein the micro collimating lens 1211 "From the upper surface 1221" of the light-transmitting substrate 122" extends upwards integrally to form an array-distributed micro-convex lens structure on the upper surface 1221" of the light-transmitting substrate 122", so that the micro-collimation array 12' is implemented as a microlens array, and the microcollimating lens 1211" in the microlens array is used to collimate the pixel light beams emitted through the corresponding Micro LED 111".

It is worth noting that, as shown in FIG. 19, since the plurality of micro collimator lenses 1211" are all distributed on the upper surface 1221" of the light-transmitting substrate 122", the lower surface 1222 of the light-transmitting substrate 122" "It can still be kept flat, so the plurality of micro collimating lenses 1211" can be quickly and securely attached to the Micro LED array 11" through the light-transmissive substrate 122", so that the micro LED array The pixel light beams emitted by the Micro LED 111" in 11" can sequentially pass through the light-transmitting substrate 122" and the micro collimating lens 1211" to achieve collimation of the pixel light beams.

In addition, the surface type of the micro collimator lens 1211" can be, but is not limited to, implemented as one of a free-form surface type, a spherical surface type, and an aspheric surface type.

According to the above-mentioned first embodiment of the present invention, as shown in FIG. 19, the Micro LED display device 10" may further include an adhesive layer 13", wherein the adhesive layer 13" is disposed on the Micro LED array Between 11" and the micro-collimation array 12", the micro-collimation array 12" is firmly stacked on the Micro LED array 11" through the adhesive layer 13".

Exemplarily, an adhesive is first applied to the lower surface 1222" of the light-transmitting substrate 122" of the micro-collimation array 12", and then the micro-collimation array 12" is correspondingly stacked The Micro LED array 11" is such that the adhesive is located between the light-transmitting substrate 122" of the micro-collimation array 12" and the Micro LED array 11", so that the adhesive is cured Then, the adhesive layer 13" is formed between the light-transmitting substrate 122" of the micro-collimation array 12" and the Micro LED array 11" to complete the manufacture of the Micro LED display device 10" It can be understood that, in other examples of the present invention, the adhesive may be applied to the Micro LED array 11" first, or at the same time, the light-transmitting substrate 122 of the micro-collimation array 12" "And the adhesive is applied to the Micro LED array 11", as long as the micro collimator array 12" can be bonded to the Micro LED array 11".

It is worth noting that the distance between the adjacent Micro LED 111 ″ in the Micro LED array 11 ″ is extremely small, and it is difficult to ensure that the adhesive is applied to the Micro LED 111 when the adhesive is applied. Therefore, in order to prevent the adhesive from interfering with the pixel beam emitted by the Micro LED 111”, the adhesive layer 13” of the present invention is preferably cured by a light-transmitting adhesive.

Specifically, in the above-mentioned first embodiment of the present invention, as shown in FIG. 19, the adhesive layer 13" preferably covers the Micro LED 111" of the Micro LED array 11", so as to protect the While the micro-collimation array 12" is firmly attached to the Micro LED array 11", the Micro LED 111" can also be protected by the adhesive layer 13". It is understandable that due to the adhesion The bonding layer 13" directly covers the Micro LED 111" of the Micro LED array 11". Therefore, the present invention can directly and fully apply the adhesive on the circuit board 112" of the Micro LED array 11". And make the adhesive cover the Micro LED 111", which helps to reduce the manufacturing difficulty of the Micro LED display device 10".

It is worth mentioning that in other examples of the present invention, the micro collimating element 121" in the micro collimating array 12" can also be implemented as a cone rod, a Fresnel lens or a TIR lens (ie Total internal reflection lens) and other elements capable of collimating light, so that the micro collimating array 12" respectively forms a micro cone rod array, a micro Fresnel lens array, or a micro TIR lens array, etc., to achieve The image light collimation effect of the Micro LED display device 10".

According to the above-mentioned first embodiment of the present invention, as shown in FIG. 18, the imaging lens group 20" of the Micro LED-based micro projection light engine 1" may include a plurality of lenses 21", wherein the plurality of lenses 21" is arranged coaxially, and is used to converge the image light 100" provided by the Micro LED display device 10" to realize projection imaging. It can be understood that the number and surface shape of the lenses in the imaging lens group 20" are not limited to those shown in the figure, as long as projection imaging can be achieved, and the present invention does not limit this.

It is worth mentioning that, in the above-mentioned first embodiment of the present invention, the Micro LED array 11" in the Micro LED display device 10" of the Micro LED-based micro projection light engine 1" is preferably It is implemented as a full-color MicroLED array for emitting color image light to realize the color projection imaging of the Micro LED-based micro projection light engine 1".

However, the full-colorization of MicroLED arrays has always been a bottleneck hindering its development, because arrays such as RGB three-color arrays need to install red, blue, and green dies in stages, and hundreds of thousands of LED dies need to be embedded. This has higher requirements for the light efficiency, wavelength consistency, and yield of the LED die. In addition, the chromatic aberration for LEDs is also a bottleneck that hinders technology. However, for monochromatic MicroLED arrays, there will not be many such problems, because the monochromatic MicroLED arrays can be assembled by flip-chip packaging and driving IC bonding.

Therefore, in order to realize the color projection of the micro-projection light engine, the second embodiment of the present invention provides a micro-projection light engine based on MicroLED, which can combine the image light emitted by the monochromatic MicroLED array of different colors through the color combination device. Color processing to form colored image light.

Specifically, as shown in FIG. 20, the MicroLED-based micro projection light engine 1A according to the second embodiment of the present invention includes a Micro LED display device 10A, a color combining device 20A, and an imaging lens group 30A, And the color combination device 20A is arranged in the optical path between the Micro LED display device 10A and the imaging lens group 30A. The Micro LED display device 10A is used to provide three channels of monochromatic image light. The color combination device 20A is used to perform color combination processing on three channels of monochromatic image light provided by the Micro LED display device 10A to synthesize one channel of color image light. The imaging lens group 30A is used to project and image the one-way color image light synthesized by the color combination device 20A, so that the MicroLED-based micro-projection light engine 1A projects a color image.

More specifically, as shown in FIG. 20, the Micro LED display device 10A may include a first monochromatic Micro LED array 11A, a second monochromatic Micro LED array 12A, and a third monochromatic Micro LED array 13A, wherein The first monochromatic Micro LED array 11A is used to emit the first monochromatic image light 101A; wherein the second monochromatic Micro LED array 12A is used to emit the second monochromatic image light 102A; wherein the third The monochromatic Micro LED array 13A is used to emit the third monochromatic image light 103A. It is worth noting that the first monochromatic Micro LED array 11A, the second monochromatic Micro LED array 12A, and the third monochromatic Micro LED array 13A are preferably implemented as green light-emitting elements and red light-emitting elements in sequence. And a blue light emitting element, so that the first monochromatic image light 101A, the second monochromatic image light 102A, and the third monochromatic image light 103A are sequentially implemented as green light, red light, and The three primary colors of blue light (ie, RGB). It is understandable that in other examples of the present invention, the first single-color Micro LED array 11A, the second single-color Micro LED array 12A, and the third single-color Micro LED array 13A may also emit other signals in sequence. Color image light.

Exemplarily, as shown in FIG. 20, in the above-mentioned second embodiment of the present invention, the color combination device 20A may include a first prism 21A, a second prism 22A, a third prism 23A, and a first film. System 24A and a second film system 25A, wherein the third prism 23A is disposed between the first prism 21A and the second prism 22A, and the first film system 24A is disposed on the second prism 22A. Between the prism 22A and the third prism 23A, and the second film system 25A is provided between the first prism 21A and the third prism 23A. The first monochromatic Micro LED array 11A, the second monochromatic Micro LED array 12A, and the third monochromatic Micro LED array 13A are arranged to correspond to the first color combination device 20A. The prism 21A, the second prism 22A, and the third prism 23A make it through the first monochromatic Micro LED array 11A, the second monochromatic Micro LED array 12A, and the third monochromatic Micro LED array 13A The emitted first road of monochromatic image light 101A, the second road of monochromatic image light 102A, and the third road of monochromatic image light 103A respectively enter the first prism 21A and the second prism 22A And the third prism 23A.

In particular, the structure of the second prism 22A and the third prism 23A enables the second path of monochromatic light 102 and the third path of monochromatic light 103 to enter the second prism 22A and the third prism, respectively. The angle of light behind the third prism 23A satisfies the condition of total reflection, and is used to make the second path of monochromatic image light 102A and the third path of monochromatic image light 103A lie on the second prism 22A and the third prism respectively. Total reflection occurs in 23A to change the propagation direction of the second monochromatic light 102A and the third monochromatic light 103, so that the second monochromatic image light 102A and the third monochromatic light 102A and the third monochromatic light The image light 103A propagates toward the first film system 24A and the second film system 25A, respectively. It is worth noting that the color combination device 20A of the present invention adopts an innovative structural design, which helps to reduce the difficulty of processing and assembly, thereby reducing the manufacturing cost of the color combination device 20A. At the same time, the color combination device 20A can also improve the light energy utilization rate of the Micro LED-based micro projection light engine 1A.

As shown in FIG. 20, the first film system 24A is preferably used to reflect the second monochromatic image light 102A, and transmit the first monochromatic image light 101A and the third monochromatic image light. Light 103A; the second film system 25A is preferably used to reflect the third monochromatic image light 103A and transmit the first monochromatic image light 101A. More preferably, the second film system 25A is used to reflect the third monochromatic image light 103A and transmit the first monochromatic image light 101A and the second monochromatic image light 102A.

In this way, as shown in FIG. 20, the first monochromatic image light 101A from the first monochromatic Micro LED array 11A can sequentially pass through the first prism 21A, the second film system 25A, and the The third prism 23A, the first film system 24A, and the second prism 24A propagate along the color combination light path of the color combination device 20A; the second path from the second monochromatic Micro LED array 12A The monochromatic image light 102A is first totally reflected in the second prism 22A to propagate to the first film system 24A, and after being reflected by the first film system 24A back to the second prism 22A, it passes through After passing through the second prism 22A, it travels along the color combining light path of the color combining device 20A; the third monochromatic image light 103A from the third monochromatic Micro LED array 13A first passes through the first Total reflection occurs in the triangular prism 23A to propagate to the second film system 25A, and after being reflected by the second film system 24A back to the third prism 23A, it passes through the third prism 23A, the first prism 23A, and the first prism 23A. The film system 24A and the second prism 24A then propagate along the color combination light path of the color combination device 20A.

In summary, the first path of monochrome image light 101A, the second path of monochrome image light 102A, and the third path of monochrome image light 103A emitted from the color combination device 20A are all along the rear edge of the composite. The color combination light path of the color device 20A propagates, so that the color combination device 20A can transmit the first single-color image light 101A from the first single-color Micro LED array 11A to the second single-color image light 101A. The second monochromatic image light 102A of the color Micro LED array 12A and the third monochromatic image light 103A from the third monochromatic Micro LED array 13A are synthesized into combined color light ( That is, color image light). It is understandable that, in order to ensure that the drawings can clearly show the color combination process and principle of the color combination device 20A, for example, as shown in the figure of FIG. 20, three single colors propagating along the same optical path after color combination are shown in the accompanying drawings. The image light is drawn separately.

It is worth noting that, in the above example of the present invention, the first film system 24A can be, but is not limited to, implemented as a red light reflecting film for reflecting red light and transmitting blue and green light. The second film system 25A may, but is not limited to, be implemented as an anti-blue film for reflecting blue light and transmitting red and green light. Of course, in other examples of the present invention, the second film system 25A can also be implemented as other types of film systems such as a green light-transmitting film, as long as it can ensure blue light reflection and green light transmission. Alternatively, the first film system 24A can also be implemented as the anti-blue light film, and the second film system is implemented as the red light reflective film accordingly.

It is worth mentioning that the imaging lens group 30A in the Micro LED-based micro projection light engine 1A is located in the color combination path of the color combination device 20A to ensure that the color combination device 20A is combined The color image light can be projected and imaged through the imaging lens group 30A.

According to the foregoing embodiment of the present invention, as shown in FIG. 20, the Micro LED display device 10A of the MicroLED-based micro projection light engine 1A further includes three micro collimator arrays 14A, and the three micro collimators The straight array 14A is respectively arranged between the first single-color Micro LED array 11A, the second single-color Micro LED array 12A, and the third single-color Micro LED array 13A and the color combination device 20A. When collimating the first monochromatic image light 101A, the first monochromatic image light 101A, which is emitted through the first monochromatic Micro LED array 11A, the second monochromatic Micro LED array 12A, and the third monochromatic Micro LED array 13A, respectively The second channel of monochromatic image light 102A and the third channel of monochromatic image light 103A help to improve the light energy utilization rate of the MicroLED-based micro-projection light engine 1A and reduce stray light effects.

Preferably, the three micro-collimation arrays 14A are respectively glued to the corresponding first single-color Micro LED array 11A, the second single-color Micro LED array 12A, and the third single-color Micro LED array 13A. , So as to ensure that the micro collimating elements in the micro collimating array 14A can correspond to the Micro LEDs in the micro LED array, so as to better achieve the collimation effect.

Fig. 21 shows a first modified implementation of the Micro LED-based micro projection light engine according to the above-mentioned second embodiment of the present invention. Specifically, compared to the second embodiment according to the present invention, the color combination device 20B of the Micro LED-based micro projection light engine 1B in the first modified embodiment of the present invention is implemented as An X-color prism to transmit the first monochromatic image light 101A from the first monochromatic Micro LED array 11A and the monochromatic image light 101A from the second monochromatic Micro LED array 12A through the X color prism The second monochromatic image light 102A and the third monochromatic image light 103A from the third monochromatic Micro LED array 13A are synthesized into color image light propagating along the same optical path.

Exemplarily, in this modified embodiment of the present invention, as shown in FIG. 21, the color combination device 20B may include four right-angle prisms 21B, a first film system 22B, and a second film system 23B. The four right-angle prisms 21B are glued together along the right-angled surfaces, and the first film system 22B and the second film system 23B are intersectedly arranged between the right-angled surfaces of the four right-angle prisms 21B to form The color combination device 20B (that is, the X color combination prism) of the X-Cube structure, wherein the slopes of the three right-angle prisms 21B respectively face the first monochromatic Micro LED array 11A and the second monochromatic LED array 11A. The Micro LED array 12A and the third monochromatic Micro LED array 13A are used as the three incident surfaces of the color combination device 20B; and the remaining one of the slopes of the right-angle prism 21B faces the imaging lens group 30A, As an exit surface of the color combination device 20B.

As shown in FIG. 21, the incident surface of the color combining device 20B corresponding to the first monochromatic Micro LED array 11A is opposite to the exit surface of the color combining device 20B. The first film system 22B is used to reflect the second monochromatic image light 102A from the second monochromatic Micro LED array 12A, and to transmit the second monochromatic image light 102A from the first monochromatic Micro LED array 11A. One channel of monochromatic image light 101A and the third channel of monochromatic image light 103A from the third monochromatic Micro LED array 13A. The second film system 23B is used to reflect the third monochromatic image light 103A from the third monochromatic Micro LED array 13A, and to transmit and transmit the monochromatic image light 103A from the first monochromatic Micro LED array 11A. The first monochromatic image light 101A and the second monochromatic image light 102A from the second monochromatic Micro LED array 12A. Based on this, the color combination device 20B can combine the first monochromatic image light 101A from the first monochromatic Micro LED array 11A, and the second monochromatic image light 101A from the second monochromatic Micro LED array 12A. The monochromatic image light 102A and the third monochromatic image light 103A from the third monochromatic Micro LED array 13A synthesize a color image light emitted from the exit surface of the color combination device 20B.

Fig. 22 shows a second modified implementation of the Micro LED-based micro projection light engine according to the above second embodiment of the present invention. Specifically, compared to the second embodiment according to the present invention, the color combination device 20C of the Micro LED-based micro projection light engine 1C in the second modified embodiment of the present invention is implemented as An X color combination board, through which the first monochromatic image light 101A from the first monochromatic Micro LED array 11A and the monochromatic image light 101A from the second monochromatic Micro LED array 12A The second monochromatic image light 102A and the third monochromatic image light 103A from the third monochromatic Micro LED array 13A are synthesized into color image light propagating along the same optical path.

Exemplarily, as shown in FIG. 22, in this modified embodiment of the present invention, the color combination device 20C may include two light-transmitting plates 21C, a first film system 22C, and a second film system 23C, wherein The two light-transmitting plates 21C are arranged crosswise, and the first film system 22C and the second film system 23C are respectively plated on the surface of the light-transmitting plate 21C to form an X-Plate structure The color combination device 20C.

The first monochromatic Micro LED array 11A, the second monochromatic Micro LED array 12A, the third monochromatic Micro LED array 13A, and the imaging lens group 30A are respectively located in the two light-transmitting plates 21C Between adjacent two ends; and the imaging lens group 30A and the first monochromatic Micro LED array 11A are respectively located on opposite sides of the color combination device 20C. The first film system 22C is used to reflect the second monochromatic image light 102A from the second monochromatic Micro LED array 12A, and transmit the second monochromatic image light 102A from the first monochromatic Micro LED array 11A. One channel of monochromatic image light 101A and the third channel of monochromatic image light 103A from the third monochromatic Micro LED array 13A. The second film system 23C is used to reflect the third monochromatic image light 103A from the third monochromatic Micro LED array 13A, and to transmit and transmit the monochromatic image light 103A from the first monochromatic Micro LED array 11A. The first monochromatic image light 101A and the second monochromatic image light 102A from the second monochromatic Micro LED array 12A. Based on this, the color combination device 20C can combine the first monochromatic image light 101A from the first monochromatic Micro LED array 11A and the second monochromatic image light 101A from the second monochromatic Micro LED array 12A. One channel of monochromatic image light 102A and the third channel of monochromatic image light 103A from the third monochromatic Micro LED array 13A synthesize color image light directed to the imaging lens group 30A.

According to another aspect of the present invention, the present invention further provides a near-eye display device, as shown in FIGS. 23A and 3B, wherein the near-eye display device includes at least one Micro LED-based micro projection light engine 1" (1A, 1B) , 1C) and a near-eye display device body 400", wherein the Micro LED-based micro projection light engine 1" (1A, 1B, 1C) is correspondingly disposed on the near-eye display device body 400" for The near-eye display device body 400" provides image light to transmit the image light provided by the Micro LED-based micro projection light engine 1" (1A, 1B, 1C) to the user's eyes through the near-eye display device body 400" , In order to realize the near-eye display function.

It is worth mentioning that the type of the near-eye display device body 400" is not limited. For example, in an example of the present invention, as shown in FIG. 23A, the near-eye display device body 400" is implemented as a display waveguide. 410" to transfer the image light provided by the Micro LED-based micro-projection light engine 1" (1A, 1B, 1C) through the display waveguide 410" in a divergent manner, so that the user can pass through the display waveguide 410" Come to watch the image corresponding to the image light to obtain an augmented reality experience.

In another example of the present invention, as shown in FIG. 23B, the near-eye display device body 400" is implemented as a turn-back display 420" so as to pass through the turn-back display 420" and pass through the MicroLED-based The image light provided by the micro-projection light engine 1" (1A, 1B, 1C) enables the user to view the image corresponding to the image light through the folding display 420" to obtain an augmented reality experience.

Specifically, as shown in FIG. 23B, the fold-back display 420" can be, but is not limited to, implemented to include a reflection-reflective component 421" and a transparent reflection component 422", wherein the reflection-reflective component 421" is disposed on the The projection path of the Micro LED-based micro-projection light engine 1" (1A, 1B, 1C), and the see-through reflection component 422" is correspondingly arranged on the reflection side of the anti-transmission component 421", so that the The image light projected by the Micro LED micro-projection light engine 1" (1A, 1B, 1C) is first reflected by the anti-transparent component 421" to propagate to the see-through reflecting component 422", and then by the see-through reflecting component 422" Reflected back to the anti-transmissive component 421" to penetrate the anti-transparent component 421" and enter the user’s eyes for imaging. At the same time, the external ambient light can sequentially pass through the see-through reflecting component 422" and all The reflective component 421" is shot into the eyes of the user, so that the user can see the image (virtual image) projected by the Micro LED-based micro-projection light engine 1" (1A, 1B, 1C) and the external environment (real image) at the same time ) To achieve an augmented reality experience. It can be understood that the reflective component 421" can be, but is not limited to, implemented as a half mirror or a polarizing beam splitter.

It is worth noting that the near-eye display device body 400" can be any glasses, head-mounted display device, augmented reality device, virtual reality device, or mixed reality device that can be configured with the Micro LED-based micro projection light engine 1 "(1A, 1B, 1C) equipment or system. Those skilled in the art can understand that, although the near-eye display device body 400" is implemented as a spectacle lens as an example in FIGS. 23A and 23B, it does not constitute a limitation to the content and scope of the present invention.

According to another aspect of the present invention, the present invention further provides a method for manufacturing a micro-projection light engine based on Micro LED. Specifically, as shown in FIG. 24, the manufacturing method of the Micro LED-based micro projection light engine includes the steps:

S100": Provide at least one Micro LED array and one imaging lens group, wherein the Micro LED array is used to emit image light; and

S200": correspondingly set the imaging lens group to the Micro LED array, so that the imaging lens group can project and image the image light emitted through the Micro LED array.

It is worth noting that, in an example of the present invention, as shown in FIG. 24, the manufacturing method of the Micro LED-based micro projection light engine further includes the steps:

S300": A micro collimating array is respectively arranged in the light path between the Micro LED array and the imaging lens group, so that the image light emitted through the Micro LED array is first collimated by the micro collimating array , And then perform projection imaging through the imaging lens group.

It is worth mentioning that, in another example of the present invention, as shown in FIG. 24, the manufacturing method of the Micro LED display device further includes the steps:

S300"': Set a color combination device in the light path between the plurality of Micro LED arrays and the imaging lens group, so that the image light emitted by the Micro LED array first passes through the color combination device for color combination , And then perform projection imaging through the imaging lens group.

Those skilled in the art should understand that the above description and the embodiments of the present invention shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been completely and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the principles, the implementation of the present invention may have any deformation or modification.

Claims

A color combining device for combining the first monochromatic light, the second monochromatic light, and the third monochromatic light into a single light, characterized in that the color combining device has a color combining light path, and includes:

A second prism for total reflection of the second monochromatic light incident on the second prism;

A third prism for total reflection of the third monochromatic light incident on the third prism;

A first film system, wherein the first film system is used to reflect the second monochromatic light, and transmit the first monochromatic light and the third monochromatic light, wherein the first film is located at Between the second prism and the third prism, and the first film system is used to reflect the second monochromatic light totally reflected by the second prism back to the second prism, so that the The second monochromatic light propagates along the combined color light path after passing through the second prism; and

A second film system, wherein the second film system is used to reflect the third monochromatic light and transmit the first monochromatic light, and the third prism is located between the second film system and the first monochromatic light. Between a film system, wherein the second film system is used to reflect the third monochromatic light totally reflected by the third prism back to the third prism, so that the third monochromatic light passes through sequentially After passing through the third prism, the first film system, and the second prism, it propagates along the color-combining light path, and the second film system is also used to transmit the first monochromatic light to the first A triangular prism, so that the first monochromatic light passes through the second film system, the third prism, the first film system, and the second prism in sequence, and then propagates along the combined color light path.
The color combination device of claim 1, further comprising a first prism, wherein the second film system is located between the first prism and the third prism for making the first monochromatic light in After passing through the first prism, the second film system, the third prism, the first film system, and the second prism in sequence, it propagates along the color combination light path.
The color combination device of claim 2, wherein the first prism has a first incident surface and a first exit surface, and the first exit surface of the first prism faces the second film The system is used to make the first monochromatic light incident from the first incident surface exit from the first exit surface after passing through the first prism to be directed toward the second film system.
The color combination device of claim 3, wherein the first prism further has a first functional surface, wherein the first functional surface of the first prism serves as a total reflection surface for total reflection from the The first monochromatic light incident on the first incident surface causes the first monochromatic light after being totally reflected to exit from the first exit surface.
The color combination device of claim 3, further comprising a third film system, wherein the third film system is used to reflect the first monochromatic light, and the third film system is correspondingly disposed on the The first prism is used to reflect the first monochromatic light incident from the first incident surface, so that the reflected first monochromatic light is emitted from the first exit surface.
The color combination device according to any one of claims 3 to 5, wherein the second prism has a second incident surface and a second exit surface, and the second exit surface of the second prism serves as The total reflection surface is used to totally reflect the second monochromatic light incident from the second incident surface, so that the second monochromatic light after being totally reflected is directed toward the first film system.
7. The color combination device of claim 6, wherein the second prism further has a second functional surface, wherein the second functional surface of the second prism faces the third prism, and the first The film is plated on the second functional surface of the second prism.
7. The color combination device of claim 7, wherein the third prism has a third incident surface and a third exit surface, wherein the third exit surface of the third prism serves as a total reflection surface, and the The third exit surface of the third prism corresponds to the second functional surface of the second prism, and is used to totally reflect the third monochromatic light incident from the third entrance surface, so that the The reflected third monochromatic light is directed toward the second film system.
8. The color combination device of claim 8, wherein the third prism further has a third functional surface, wherein the third functional surface of the third prism corresponds to the first prism The exit surface, and the second film system is plated on the third functional surface of the third prism.
8. The color combination device of claim 8, further comprising an air gap, wherein the air gap is located between the third exit surface of the third prism and the first film system.
The color combination device of claim 10, further comprising an anti-reflection film, wherein the anti-reflection film is respectively disposed on the first incident surface and the first exit surface of the first prism, and the first The second incident surface of the two prisms and the third incident surface of the third prisms.
The color combination device according to any one of claims 1 to 5, wherein the first film is a red-reflecting film or an anti-blue film, and the second film is correspondingly the anti-blue film or The red light reflecting film.
A lighting system, characterized in that it includes:

A light source unit, wherein the light source unit includes:

A first light-emitting element for emitting the first monochromatic light;

A second light-emitting element for emitting a second monochromatic light; and

A third light-emitting element for emitting a third monochromatic light; and

A color combination device, wherein the color combination device has a color combination light path and includes:

A second prism, wherein the second prism corresponds to the second light-emitting element, and the second prism has a total reflection structure for totally reflecting the second monochromatic light from the second light-emitting element ；

A third prism, wherein the third prism corresponds to the third light-emitting element, and the third prism has a total reflection structure for totally reflecting the third monochromatic light from the third light-emitting element;

A first film system, wherein the first film system is used to reflect the second monochromatic light, and transmit the first monochromatic light and the third monochromatic light, wherein the first film is located at Between the second prism and the third prism, and the first film system is used to reflect the second monochromatic light totally reflected by the second prism back to the second prism, so that the The second monochromatic light propagates along the combined color light path after passing through the second prism; and

A second film system, wherein the second film system is used to reflect the third monochromatic light and transmit the first monochromatic light, and the third prism is located between the second film system and the first monochromatic light. Between a film system, wherein the second film system is used to reflect the third monochromatic light totally reflected by the third prism back to the third prism, so that the third monochromatic light passes through sequentially After passing through the third prism, the first film system, and the second prism, it propagates along the combined color light path, and the second film system is also used to transfer the first path from the first light-emitting element The monochromatic light is transmitted to the third prism, so that the first monochromatic light passes through the second film system, the third prism, the first film system, and the second prism in sequence. The combined color light path spreads.
The lighting system of claim 13, wherein the color combination device further comprises a first prism, wherein the second film system is located between the first prism and the third prism, and the first prism The prism corresponds to the first light-emitting element, and is used to make the first monochromatic light from the first light-emitting element sequentially pass through the first prism, the second film system, the third prism, The first film system and the second prism propagate along the combined color light path.
The lighting system according to claim 14, wherein the sizes of the first prism, the second prism, and the third prism of the color combination device are matched with each other for making the first monochromatic light, The optical path of the second monochromatic light and the third monochromatic light in the color combining device are the same.
15. The lighting system according to any one of claims 13 to 15, wherein the first light-emitting element, the second light-emitting element, and the third light-emitting element are monochromatic MicroLEDs of different colors, respectively.
A color combination method is characterized in that it comprises the steps:

Respectively totally reflecting the second monochromatic light and the third monochromatic light to change the propagation direction of the second monochromatic light and the third monochromatic light; and

The second monochromatic light and the third monochromatic light after being totally reflected are respectively reflected to change the propagation direction of the second monochromatic light and the third monochromatic light again, so that the second monochromatic light The monochromatic light and the third monochromatic light propagate along the same optical path as the first monochromatic light after being turned twice.
The color combination method according to claim 17, further comprising the steps of:

Reflect the first monochromatic light to change the propagation direction of the first monochromatic light, so that the second monochromatic light and the third monochromatic light will be simultaneously with the reflected light after being turned twice. The first monochromatic light travels along the same optical path.
A micro-projection light engine based on Micro LED, which is characterized in that it includes:

A Micro LED display device, wherein the Micro LED display device is used to provide image light; and

An imaging lens group, wherein the imaging lens group is correspondingly arranged on the Micro LED display device for projecting and imaging the image light from the Micro LED display device.
The Micro LED-based micro projection light engine of claim 19, wherein the Micro LED display device includes at least one Micro LED array, wherein the Micro LED array includes a circuit board and a plurality of Micro LEDs, wherein the Micro LED display device includes at least one Micro LED array. Multiple Micro LEDs are energized and integrated on the circuit board, and the multiple Micro LEDs are arranged in an array on the circuit board, wherein the Micro LEDs are used to emit a pixel beam.
The Micro LED-based micro projection light engine of claim 20, wherein the Micro LED display device further comprises at least one micro collimating array, wherein the micro collimating array includes a plurality of micro collimating elements distributed in an array , Wherein the micro collimation array is correspondingly stacked on the Micro LED array, and the micro collimation element corresponds to the Micro LED one-to-one for collimating the pixel emitted by the Micro LED beam.
The Micro LED-based micro projection light engine of claim 21, wherein the Micro LED display device further comprises at least one adhesive layer, wherein the adhesive layer is disposed on the Micro LED array and the micro LED. Between the collimating arrays, the micro collimating array is firmly stacked on the Micro LED array through the adhesive layer.
The Micro LED-based micro projection light engine of claim 22, wherein the micro collimating element is one selected from the group consisting of micro collimating lens, cone rod, Fresnel lens, and TIR lens.
The Micro LED-based micro projection light engine according to any one of claims 19 to 23, further comprising a color combining device, wherein the color combining device is arranged between the Micro LED display device and the imaging lens group In the light path between the light paths, the color combination device is used to combine three channels of monochromatic image light provided by the Micro LED display device into one color image light, and the imaging lens group is used to combine the color image light through the color combination. The color image formed by the combination of the device is light-projected into a color image.
The Micro LED-based micro projection light engine of claim 24, wherein the Micro LED display device comprises a first monochromatic Micro LED array for emitting a first channel of monochromatic image light, and a first monochromatic Micro LED array for emitting a first channel of monochromatic image light. A second monochromatic Micro LED array with two monochromatic image lights and a third monochromatic Micro LED array for emitting a third monochromatic image light, wherein the first monochromatic Micro LED array and the second monochromatic LED array The monochromatic Micro LED array and the third monochromatic Micro LED array are respectively arranged on the three incident surfaces of the color combination device, and the imaging lens group corresponds to the exit surface of the color combination device.
The Micro LED-based micro projection light engine of claim 25, wherein the color combination device includes a first prism, a second prism for totally reflecting the second path of monochromatic image light, and a second prism for A third prism that totally reflects the third monochromatic image light, a first film for reflecting the second monochromatic image light and transmitting the first monochromatic image light and the third monochromatic image light System and a second film system for reflecting the third monochromatic light and transmitting the first monochromatic light, wherein the third prism is arranged between the first prism and the second prism And the first film system is located between the second prism and the third prism, and is used to reflect the second path of monochromatic image light totally reflected by the second prism back to the second prism, To propagate along a combined color light path of the color combining device; wherein the second film system is located between the first prism and the third prism, and is used to totally reflect the third path through the third prism The monochromatic image light is reflected back to the third prism to propagate along the combined color light path, and the second film system is also used to transmit the first monochromatic image light passing through the first prism to travel along the The combined color light path spreads.
The Micro LED-based micro-projection light engine of claim 26, wherein the first film system is a red light-reflecting film or an anti-blue film, and the second film system is correspondingly the anti-blue film or The red light reflecting film.
The Micro LED-based micro projection light engine of claim 25, wherein the color combination device is an X color prism or an X color plate.
A near-eye display device, characterized in that it includes:

A close-to-eye display device body; and

At least one Micro LED-based micro-projection light engine, wherein the Micro LED-based micro-projection light engine is correspondingly disposed on the near-eye display device body for providing image light for the near-eye display device body; wherein The micro-projection light engine based on Micro LED includes:

A Micro LED display device, wherein the Micro LED display device is used to provide image light; and

An imaging lens group, wherein the imaging lens group is correspondingly arranged on the Micro LED display device for projecting and imaging the image light from the Micro LED display device.
The near-eye display device of claim 29, wherein the body of the near-eye display device is a display waveguide for divertingly transmitting the image light provided by the Micro LED-based micro projection light engine.
28. The near-eye display device according to claim 29, wherein the body of the near-eye display device is a fold-back display for reflexively transmitting the image light provided by the micro-projection light engine based on the Micro LED.
The near-eye display device of claim 31, wherein the fold-back display comprises a reflection-reflective component and a see-through reflection component, wherein the reflection-reflective component is arranged in the projection of the Micro LED-based micro-projection light engine Path, and the see-through reflection component is correspondingly arranged on the reflection side of the reflection component, so that the image light from the micro-projection light engine based on the Micro LED is first reflected by the reflection component to propagate To the see-through reflection component, and then be reflected by the see-through reflection component back to the anti-transmission component to pass through the anti-transmission component.
A method for manufacturing a micro-projection light engine based on Micro LED is characterized in that it comprises the following steps:

Providing at least one Micro LED array and an imaging lens group, wherein the Micro LED array is used to emit image light; and

Correspondingly, the imaging lens group is arranged on the Micro LED array, so that the imaging lens group can project and image the image light emitted through the Micro LED array.
The method of manufacturing a micro-projection light engine according to claim 33, further comprising the steps of:

A micro collimating array is respectively arranged in the light path between the Micro LED array and the imaging lens group, so that the image light emitted by the Micro LED array is first collimated by the micro collimating array, and then Projection imaging is performed through the imaging lens group.
The method for manufacturing a micro-projection light engine according to claim 33 or 34, further comprising the steps of:

A color combining device is arranged in the light path between the plurality of Micro LED arrays and the imaging lens group, so that the image light emitted through the Micro LED array is combined by the color combining device, and then passes through The imaging lens group performs projection imaging.
A Micro LED display device, characterized in that it includes:

A Micro LED array, where the Micro LED array includes:

A circuit board; and

A plurality of Micro LEDs, wherein the plurality of Micro LEDs are energized and integrated on the circuit board, and the plurality of Micro LEDs are arranged in an array on the circuit board, wherein the Micro LEDs have a light emitting path, For emitting a light beam of pixels along the light emitting path; and

A micro collimating array, wherein the micro collimating array is correspondingly stacked on the Micro LED array for collimating the pixel beams emitted by the Micro LED.
The Micro LED display device of claim 36, wherein the micro collimation array includes a plurality of micro collimation elements distributed in an array, wherein the micro collimation elements correspond to the Micro LEDs one-to-one, and the The micro collimating element is located in the light emitting path of the corresponding Micro LED.
The Micro LED display device of claim 37, wherein the micro collimation array further comprises a light-transmitting substrate, wherein the plurality of micro-collimating elements are arranged on the light-transmitting substrate in an array.
The Micro LED display device of claim 38, wherein the plurality of micro collimation elements are integrally connected with the light-transmitting substrate to form the micro collimation array with an integrated structure.
The Micro LED display device of claim 39, wherein 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.
The Micro LED display device of claim 40, wherein the light-transmitting substrate further has a plurality of receiving grooves, wherein the plurality of receiving grooves are arranged in an array on the lower surface of the light-transmitting substrate, and the receiving The grooves correspond to the micro-collimating elements one-to-one, so as to locate and accommodate the corresponding micro LEDs.
The Micro LED display device of claim 37 or 38, wherein the micro collimating element is a micro collimating lens.
The Micro LED display device according to any one of claims 37 to 39, wherein the micro collimating element is a cone rod, wherein the cone rod has a light entrance end and a light exit end, and the cone rod The size of the light entrance end is smaller than the size of the light exit end.
The Micro LED display device according to any one of claims 37 to 39, wherein the micro collimator element is a Fresnel lens.
The Micro LED display device according to any one of claims 37 to 39, wherein the micro collimating element is a TIR lens, wherein the TIR lens has an inner cavity, and the Micro LED is accommodated in the TIR The inner cavity of the lens.
The Micro LED display device according to any one of claims 36 to 41, further comprising an adhesive layer, wherein the adhesive layer is located between the Micro LED and the micro collimator array to connect the micro The collimating array is firmly bonded to the Micro LED.
The Micro LED display device of claim 46, wherein the adhesive layer is cured by a light-transmitting adhesive, and the adhesive layer covers the Micro LED of the Micro LED.
A micro-projection system is characterized in that it includes:

A projection system body; and

A Micro LED display device, wherein the Micro LED display device is correspondingly disposed on the projection system body for providing image light for the projection system body; wherein the Micro LED display device includes:

A Micro LED array, where the Micro LED array includes:

A circuit board; and

A plurality of Micro LEDs, wherein the plurality of Micro LEDs are energized and integrated on the circuit board, and the plurality of Micro LEDs are arranged in an array on the circuit board, wherein the Micro LEDs have a light emitting path, For emitting a light beam of pixels along the light emitting path; and

A micro collimating array, wherein the micro collimating array is correspondingly stacked on the Micro LED array for collimating the pixel beams emitted by the Micro LED.
A method for manufacturing a Micro LED display device, which is characterized in that it comprises the following steps:

A Micro LED array and a micro collimation array are provided, wherein the Micro LED array includes a circuit board and a plurality of Micro LEDs, wherein the plurality of Micro LEDs are energized and integrated on the circuit board, and the plurality of Micro LEDs are energized and integrated on the circuit board. Micro LEDs are distributed in an array on the circuit board, wherein the Micro LED 11 has a light emitting path for emitting pixel beams along the light emitting path; and

Correspondingly, the micro collimating array is stacked on the Micro LED array, so as to collimate the pixel beams emitted by the Micro LED in the Micro LED array through the micro collimating array.
The method for manufacturing a Micro LED display device according to claim 49, wherein the micro collimation array comprises a plurality of micro collimation elements distributed in an array, wherein the micro collimation elements correspond to the Micro LEDs in a one-to-one relationship, And the micro collimator element is located in the light emitting path of the corresponding micro LED.
The method for manufacturing a Micro LED display device according to claim 49 or 50, further comprising the steps of:

Apply an adhesive between the micro-collimation array and the Micro LED array to form an adhesive layer for fixing the micro-collimation array to the Micro LED array after the adhesive is cured .