CN210835436U

CN210835436U - Micro LED-based AR projection assembly

Info

Publication number: CN210835436U
Application number: CN201921868580.0U
Authority: CN
Inventors: 楼歆晔; 孟玉凰; 林涛
Original assignee: Shanghai North Ocean Photonics Technology Co Ltd
Current assignee: Shanghai kunyou Technology Co., Ltd
Priority date: 2019-07-29
Filing date: 2019-11-01
Publication date: 2020-06-23
Anticipated expiration: 2029-11-01
Also published as: CN112305759A; CN211698430U

Abstract

Micro LED based AR projection subassembly, it includes: at least one display element using Micro LEDs for emitting image light, wherein the number of the display elements is at least two, at least one of which is a single color display element; and the light combining element is arranged among the display elements and is used for combining the light rays emitted by at least two display elements so as to provide full-color image light rays.

Description

Micro LED-based AR projection assembly

Technical Field

The utility model relates to an optics field further relates to an AR display device and projection subassembly based on Micro LED.

Background

Augmented Reality (AR) is a new technology that superimposes real world information and virtual world information onto the same picture or space in real time. The sensory experience beyond reality is realized by superimposing the prompt information generated by the computer, the virtual object or the virtual scene into the real world. Because the display device has the characteristic of enhancing the display output of the real environment, the enhancement is widely applied in the fields of visualization of data models, research and development and manufacture of military weapons, flight navigation, medical training, remote control, entertainment, art and the like.

Display devices in the augmented reality technology are classified into two main categories, an optical transmission type and a video transmission type, according to the display principle. Due to the advantages of high resolution, no visual deviation, no time delay, better conformity to social habits and the like, the optical transmission type augmented reality display system has become the mainstream.

The light source and the light transmission path are equally important for display devices. In the case of clear and effective image information of the light source element, light is reliably transmitted without loss or interference, and the final image has the best effect. Many current augmented reality display devices (AR) use direct image display, and how much information a user can receive from a light source depends on the viewing position. In particular, in optical applications similar to augmented reality displays (AR), ambient light from the outside interferes a lot, and the optical design is particularly important.

The optical transmission type augmented reality display scheme is various, and at present, the design scheme based on a flat combiner (fly combiner), a free-form surface element (moth eye), a free prism combiner and a Bird Bath (Bird Bath) is common. The optical design principle of the plane combiner type AR glasses is that light emitted by display sources such as an LCD (liquid crystal display), an OLED (organic light emitting diode) and the like is collimated by a projection lens and then projected onto a spectroscope with a certain transmittance inverse ratio, and the spectroscope can reflect the light projected by the display sources into human eyes. Meanwhile, the human eye can see the outside space through the spectroscope.

Free-form surface element (moth eye) type AR glasses employ a relatively simple optical design, the main components of which are a display source and a curved beam splitter with reflection/transmission (R/T) values. Light from the display source is projected directly into the concave mirror combiner and reflected back into the eye. The ideal position of the display source is centered and parallel to the mirror plane. Technically speaking, the ideal position is where the display source covers the eyes of the user, so most designs move the display "off-axis", i.e. above the forehead, but there is the disadvantage that the off-axis display on the concave mirror is distorted and needs to be modified at the software/display side.

The free prism combiner type AR glasses are similar in principle to the free-form surface element type AR glasses, and mainly constitute a display source, and a free combination prism group having reflection/transmission (R/T) values. The light emitted by the display source is directly emitted to the prism group and then reflected back to the eye. The greatest disadvantage of this type of design is the relatively large volume and the relatively high weight. If devices such as LCoS and DLP are used as image sources, the appearance is more clumsy, and the experience of a wearer is poor.

The optical design principle of Bird Bath (Bird Bath) type AR glasses is to project light from a display source to a beam splitter having reflection and transmission values (R/T) allowing the light to be partially reflected at a percentage of R and the remainder transmitted at a value of T. Having R/T at the same time allows the user to see both physical objects of the real world and digital imagery generated by the display. Light reflected from the beam splitter bounces onto the combiner, which redirects the light to the eye. The bulk of this design, while somewhat smaller than free prism combiner type AR glasses, is still quite bulky overall.

The above-described conventional AR display device has at least one of the following disadvantages. The first volume is large, the appearance is clumsy and heavy, and the user may experience discomfort when wearing for a long time. Secondly, after the transflective beam splitter is introduced, the transmission and reflection ratio is difficult to balance, and if the transmission ratio is increased, the image is unclear due to too little light reflected to eyes by an image source; if the reflectance is increased, the light which can enter human eyes from the outside is too little, as in the case of wearing sunglasses. Therefore, the two technical problems of large size and low brightness become two major mountains of the AR display device. An image source is an important component of an AR display device, and an image source with small size, high brightness and low power consumption is indispensable to solve the problems of large size and low brightness of the conventional AR display device.

Most of the image sources used in the current augmented reality display devices are transmissive Liquid Crystal Displays (LCDs), Digital Light Processors (DLPs), liquid crystal on silicon (LCoS), Organic Light Emitting Diodes (OLEDs), and micro-electromechanical scanning mirrors (MEMS scanning mirrors). The above-described display devices have more or less some limitations as microdisplays for augmented reality systems. For example, passive projection modes such as LCoS, DLP, MEMS Scanning mirror, etc. require an additional light source, so that the module size is not easy to further reduce, and the cost is high. The LCD and the OLED also have the problems of low efficiency and brightness and large power consumption, and cannot adapt to some application scenes of augmented reality. Also, OLED burn-in is a significant problem because the organic materials have a limited lifetime and are very sensitive to stability. The existence of the above problems greatly affects the optical performance and experience effect of the augmented reality device, and limits the further development and application of the augmented reality technology.

Accordingly, improvements to conventional augmented reality display devices are required for further development and application of augmented reality technology.

Disclosure of Invention

An object of the utility model is to provide a AR display device and projection subassembly based on Micro LED, it adopts Micro LED as the image source, needn't use external light source, and optical system is simple.

Another object of the present invention is to provide an AR display device based on Micro LEDs and a projection module thereof, which are suitable for different AR display device types such as flat combiner (fly combiner), free-form surface element (moth-eye), free prism combiner (fly prism combiner), or Bird Bath (Bird Bath).

Another object of the present invention is to provide an AR display device based on Micro LED and projection assembly thereof, which can provide high brightness image display, thereby providing reliable image information for users.

Another object of the utility model is to provide an AR display device and projection subassembly based on Micro LED is suitable for by the equipment of integrated in glasses formula, reduces the influence that gets into people's eye to external light, and the observation to the external world of harmless.

Another object of the present invention is to provide an AR display device based on Micro LED and a projection module thereof, which are suitable for being installed in a glasses-type device in a free-standing or embedded manner, and are controlled by a wire or wirelessly to output an image picture.

Another object of the utility model is to provide an AR display device and projection subassembly based on Micro LED utilizes Micro LED as the light emitting source, realizes the demonstration of high-quality image to stability is high, is fit for daily or industrial environment of life and uses.

Another object of the utility model is to provide an AR display device and projection subassembly based on Micro LED, its cooperation projection lens or optical device can exert the high-quality advantage of display image fully, reduce the loss in transmission process.

Another object of the utility model is to provide an AR display device and projection subassembly based on Micro LED, it can realize sending and transmitting of full-color image, has wider application adaptation occasion.

Another object of the utility model is to provide an AR display device and projection subassembly based on Micro LED, it can utilize monochromatic light emitting source to realize the output of full-color image, reduce cost and simplified structure.

Another object of the present invention is to provide an AR display device based on Micro LED and its projection module, which reduces the light loss caused by multiple reflections and reduces the clumsy feeling of the image appearance.

Another object of the utility model is to provide an AR display device and projection subassembly based on Micro LED, make full use of Micro LED's self-luminous, luminance is high, the low power dissipation, resolution and color saturation are high, long service life's advantage, have effectively solved the bulky of current device, difficult balanced transflective ratio scheduling problem.

Another object of the utility model is to provide an AR display device and projection subassembly based on Micro LED, it adopts Micro LED as the image source, compares in traditional AR display device and has smaller volume.

Another object of the utility model is to provide an AR display device and projection subassembly based on Micro LED, it adopts Micro LED as the image source, compares with traditional AR display device and has higher luminance and lower consumption.

Another object of the utility model is to provide an AR display device and projection subassembly based on Micro LED, its low power dissipation, the energy saving.

Another object of the utility model is to provide an AR display device and projection subassembly based on Micro LED compares with traditional AR display device, and the resolution is higher with the color saturation.

Another object of the utility model is to provide an AR display device and projection subassembly based on Micro LED compares with traditional AR display device, and the loss is lower, and is longe-lived.

Another object of the utility model is to provide an AR display device and projection subassembly based on Micro LED, its simple structure, low in manufacturing cost.

Accordingly, to achieve at least one of the above objects, the present invention provides an AR projection module based on Micro LED, comprising:

at least one display element using Micro LEDs for emitting image light, wherein the number of the display elements is at least two, at least one of which is a single color display element; and

and the light combining element is arranged among the display elements and is used for combining the light rays emitted by at least two display elements.

According to some embodiments, the light combining element is a color combining prism.

According to some embodiments, the light combining element is a planar optical element coated with a thin film.

According to some embodiments, the light combining element is made of prism bonding with a coating.

According to some embodiments, the configuration of the micro leds of the display element is selected from the group consisting of: the LED comprises a three-color MicroLED, at least three single-color MicroLEDs, at least one double-color MicroLED and a single-color MicroLED matched with the at least one double-color MicroLED.

According to some embodiments, the display element includes three single-color micro leds, and the light combining element transmits a part of light emitted by the single-color micro leds and reflects the remaining part of light emitted by the single-color micro leds, so that the light emitted by the three single-color micro leds forms full-color image light after passing through the light combining element.

According to some embodiments, the light combining element includes four right-angle prisms coated with a coating, and forms two orthogonal planes, wherein the light split by two single-color micro leds respectively reaches the two orthogonal planes and is reflected, and the other single-color micro led is transmitted by the right-angle prisms.

According to some embodiments, the display element includes a two-color micro led and a single-color micro led matched with the two-color micro led, and the light combining element transmits light emitted by the single-color micro led and reflects light emitted by the two-color micro led, so that light emitted by the display element forms full-color image light after passing through the light combining element.

According to some embodiments, the display element comprises a two-color micro led and a single-color micro led matched with the two-color micro led, and the light combining element reflects light emitted by the single-color micro led and transmits light emitted by the two-color micro led, so that light emitted by the display element forms full-color image light after passing through the light combining element.

According to some embodiments, the light combining element comprises a planar optical element with a coating, placed at 45 ° and-45 ° to the two-color micro leds and the single-color micro leds, respectively.

According to some embodiments, the display device further comprises a projection lens for collimating light emitted from the display element.

According to some embodiments, the projection lens comprises two convex lenses stacked on top of each other for collimating light emitted by the display-based element.

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

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

Drawings

Fig. 1 is a schematic structural view of a Micro LED-based AR display device and a developing method thereof according to a first preferred embodiment of the present invention.

Fig. 2 is a schematic structural view of the Micro LED-based AR display device and the developing method thereof according to the above preferred embodiment of the present invention.

Fig. 3 is a schematic structural view of the Micro LED-based AR display device and the developing method thereof according to the above preferred embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a Micro LED-based AR display device and a developing method thereof according to a second preferred embodiment of the present invention.

Fig. 5 is a schematic structural view of the Micro LED-based AR display device and the developing method thereof according to the above preferred embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a Micro LED-based AR display device and a developing method thereof according to a third preferred embodiment of the present invention.

Fig. 7 is a schematic structural view of a Micro LED-based AR display device and a developing method thereof according to a fourth preferred embodiment of the present invention.

Fig. 8 is a schematic structural view of a Micro LED-based AR display device and a developing method thereof according to a fifth preferred embodiment of the present invention.

Fig. 9 is a schematic structural view of the Micro LED-based AR display device and the developing method thereof according to the above preferred embodiment of the present invention.

Fig. 10A is a schematic plane structure diagram of a color combination prism of the Micro LED-based AR display device and the developing method thereof according to the above preferred embodiment of the present invention.

Fig. 10B is a schematic three-dimensional structure diagram of a color combining prism of the Micro LED-based AR display device and the developing method thereof according to the above preferred embodiment of the present invention.

Fig. 10C is a schematic diagram of the spectral distribution of three-color Micro LEDs of the Micro LED-based AR display device and the developing method thereof according to the preferred embodiment of the present invention.

Fig. 10D is a schematic diagram illustrating the correspondence between the wavelength and the reflectivity of the a surface film layer of the color-combining prism of the Micro LED-based AR display device and the developing method thereof according to the preferred embodiment of the present invention.

Fig. 10E is a schematic diagram illustrating the correspondence between the wavelength and the reflectivity of the B surface film layer of the color-combining prism of the Micro LED-based AR display device and the developing method thereof according to the preferred embodiment of the present invention.

Fig. 11 is an overall schematic diagram of a specific application of the Micro LED-based AR display device and the developing method thereof according to the above preferred embodiment of the present invention.

Fig. 12 is a schematic view of an application scenario of the Micro LED-based AR display device and the display method thereof according to the above preferred embodiment of the present invention.

Detailed Description

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

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purpose of limitation.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

Referring to fig. 1 to 10E of the specification, the utility model provides a Micro LED based AR display device and its display method is elucidated, it adopts Micro LED as the image source, needn't use additional light source, optical system simple structure, has smaller volume and higher luminance than traditional AR display device to the cost is lower, has very important meaning to AR display device's further development and application.

It is worth mentioning, the utility model discloses combine together Micro LED and planar combiner (flat combiner) type AR glasses, free curved surface component (wormhole) type AR glasses, free prism combiner type AR glasses and AR glasses such as Bird Bath (Bird Bath) type, make full use of Micro LED's self-luminescence, luminance is high, the low power dissipation, resolution and color saturation are high, long service life's advantage, effectively solved the bulky of types AR glasses such as above-mentioned, difficult balanced transflective ratio scheduling problem. The single-color or full-color augmented reality display device with high brightness, low power consumption, small volume and good stability is realized.

Due to the development problem of the current Micro LED Micro display, part of the Micro LED Micro display can display RGB three-color full-color images. Also there is some Micro LED Micro display can only show R, G, B monochromatic or two-color images, consequently the utility model designs a shine three monochromatic Micro LED Micro display and carry out the combination of colors behind the same prism, denominated this kind of Micro LED Micro display group as many compound Micro LED Micro display screen group. Aiming at the fact that part of Micro LED Micro displays can simultaneously display two colors of RGB, a bicolor Micro LED Micro display and a monochromatic Micro LED Micro display can be simultaneously irradiated to the same prism to be subjected to color combination, and the Micro LED Micro display group is named as a double-composite Micro LED Micro display screen group. For example: the displayable colors of the double-color Micro LED Micro display are Red (Red) and Green (Green), the Micro LED Micro display capable of displaying Blue (Blue) in a single color and the double-color Micro LED Micro display can be irradiated into the same prism to be mixed and superposed, and a true color image can be obtained.

To further illustrate the situation, taking a composite Micro LED Micro display set combined with a planar combiner (flatcombiner) type AR glasses as an example, the composite Micro LED Micro display set includes two structures of dual-composite and multi-composite, which will be further described in the detailed description. The composite Micro LED Micro display set can also be suitable for being combined with various AR glasses such as free-form surface element (insect eye) type AR glasses, free prism combiner type AR glasses, Bird Bath (Bird Bath) type AR glasses and the like

Specifically, referring to fig. 1 and 2 of the specification, the present invention provides a first preferred embodiment of the AR display device based on Micro LEDs and the imaging method thereof, in which the Micro LEDs are applied to flat combiner (flat combiner) type AR glasses, including but not limited to the various flat combiner (flat combiner) type AR glasses described in the figures.

In the first preferred embodiment, the Micro LED-based AR display device and the imaging method thereof include a display element 10 and a transmission element 20, wherein the transmission element 20 includes a projection lens 21 and a beam splitter 22. The display element 10 is configured to emit light, and the light emitted by the display element 10 is focused or collimated by the projection lens 21 and then reflected to human eyes by the beam splitter 22.

Further, the display element 10 is a Micro LED Micro display screen, and the light emitted by the Micro LED Micro display screen may be RGB monochromatic light or full-color light obtained by mixing RGB monochromatic light. Micro LEDs are LED scaling and matrixing technologies, which refer to a high-density and fine-scale LED array integrated on a chip, and have the greatest advantages of high brightness, high contrast and low power consumption of emitted light. The Micro LED Micro display screen is used for providing high-brightness and high-contrast monochromatic or RGB images.

The projection lens 21 may be one or more lenses, or a combination of a reflective optical element and a transmissive optical element, and is configured to focus or collimate light emitted by the display element 10 through the projection lens 21, collimate light beams emitted by the display element 10 into parallel light beams, and form an optical projector together with the display element 10.

The beam splitter 22 is a beam splitter 22 with a certain inverse transmittance ratio, which can be achieved by plating different films on the surface. The beam splitter 22 may be divided into a planar beam splitter 22 and a beam splitter prism, which function to reflect the light emitted from the display device 10 to human eyes, and allow the human eyes to see the external space. Referring to fig. 1 of the specification, the beam splitter 22 is a flat-plate beam splitter 22, and is used for reflecting the light collimated by the projection lens 21 to the human eye. Referring to fig. 2 of the specification, the beam splitter 22 is a beam splitter prism, and is used for reflecting the light collimated by the projection lens 21 to the human eye.

It is understood that the flat-plate type beam splitter 22 has a lighter weight and a smaller volume than the beam splitter prism, and it is preferable that the beam splitter 22 is implemented as the flat-plate type beam splitter 22.

In the first preferred embodiment, light emitted by the Micro LED Micro display screen passes through the projection lens

21 are collimated and then projected to the beam splitter 22, and then reflected to the human eye by the beam splitter 22, and the external light can also enter the human eye through the beam splitter 22.

Referring to the attached figure 3 of the specification, the Micro LED Micro display screen is an RGB full-color Micro LED display, and specific parameters of the Micro LED display screen are shown in the table 1. To achieve the purpose of high resolution, a silicon substrate driving method with higher cost is adopted.

TABLE 1

Referring to fig. 3 in the specification, the projection lens 21 includes two lenses, and both the two lenses are convex lenses, and the two convex lenses form a lens group to perform the functions of condensing and collimating. The beam splitter 22 is a beam splitter 22 having a certain transmittance ratio. The light reflected by the beam splitter 22 is irradiated to the pupil of the human eye.

TABLE 2

Referring to the attached drawing 3 of the specification, light emitted by the Micro LED Micro display screen is collimated by the two convex lens heads, projected onto the beam splitter 22, and reflected to human eyes by the beam splitter 22. External light can also enter the human eye through the beam splitter 22. Table 2 above is a part of the specific design parameters.

Referring to fig. 4 and 5 of the specification, the present invention provides a second preferred embodiment of the micro led-based AR display device and the imaging method thereof, in which the micro led is applied to free-form surface element (moth-eye) type AR glasses, including but not limited to the various free-form surface element (moth-eye) type AR glasses described in the figures.

In the second preferred embodiment, the Micro LED-based AR display device and the imaging method thereof include a display element 10 and a spectroscope 22, wherein the display element 10 is a Micro LED Micro display screen, and the spectroscope 22 is a curved spectroscope 22 having a certain transmittance inverse ratio, wherein the display element 10 is adapted to emit light, the spectroscope 22 is used to reflect the light emitted by the display element 10 to human eyes, and meanwhile, external light can also enter the human eyes through the spectroscope 22.

The light emitted by the display element 10 enters human eyes after being reflected by the reflector, wherein the light emitted by the display element 10 can be RGB monochromatic light or full-color light formed by mixing RGB monochromatic light. Micro LEDs are LED scaling and matrixing technologies, which refer to a high-density and fine-scale LED array integrated on a chip, and have the greatest advantages of high brightness, high contrast and low power consumption of emitted light. The display element 10 is used to provide a high brightness, high contrast monochrome or RGB image.

The curved beam splitter 22 with a certain inverse transmittance ratio may be one or more components, and its main function is to reflect the light emitted from the display device 10 back into the human eye.

Free-form surface element (moth-eye) type AR glasses employ a relatively simple optical design. It carries a display element 10 and a curved beam splitter 22 with reflection/transmission (R/T) values. Light emitted by the display element 10 is directed towards the concave mirror/combiner and reflected back into the eye. The ideal location of the display screen is centered and as parallel as possible to the curved beam splitter 22. Technically, the ideal position is for the display source to cover the user's eyes, so most designs move the display "off-axis" to be positioned above the forehead. Off-axis displays on concave mirrors suffer from distortion and require correction at the software/display side.

In other preferred embodiments of the present invention, a projection lens may be added between the display element 10 and the curved beam splitter 22 having the inverse transmittance ratio according to the requirement.

The curved beam splitter 22 with inverse transmittance ratio may be composed of one or more than one sheet, and further, may reflect light emitted from the display element 10 once to enter human eyes, or may reflect light multiple times to enter human eyes.

Referring to fig. 4 of the specification, the light emitted from the display element 10 is directly projected onto the curved beam splitter 22 with inverse transmittance ratio, and then reflected by the curved beam splitter 22 with inverse transmittance ratio to enter the human eye. External light can also enter the human eye through a curved beam splitter 22 with inverse transmittance ratio.

Specifically, referring to fig. 5 of the specification, the display element 10 is an RGB full-color Micro LED display, and specific parameters are as shown in table 1. To achieve the purpose of high resolution, a silicon substrate driving method with higher cost is adopted.

Referring to fig. 5 of the specification, a convex lens is further disposed between the display element 10 and the reflective mirror to condense and collimate the light emitted from the display element 10. The light emitted from the display element 10 is directly projected to the convex lens for focusing and collimating, and is reflected to enter human eyes after passing through the curved spectroscope 22 with inverse transmittance ratio. External light can also enter the human eye after passing through the curved beam splitter 22 with inverse transmittance ratio and the convex lens. Table 3 is a part of specific design parameters.

TABLE 3

Referring to fig. 6 of the specification, the present invention provides a third preferred embodiment of a Micro LED-based AR display device and a method for displaying the same, in which the Micro LEDs are applied to free prism combiner type AR glasses, including but not limited to, various types of free prism combiner type AR glasses described in the drawings.

In the third preferred embodiment, the Micro LED-based AR display device and the imaging method thereof include a display element 10, a projection lens 21 and a free prism group 23, wherein the display element 10 is adapted to emit light, the projection lens 21 is configured to focus and collimate the light emitted by the display element 10, the free prism group 23 is used as a spectroscope to reflect the light collimated by the projection lens 21 to human eyes, and external light can enter the human eyes through the free prism group 23.

The display element 10 is a Micro LED Micro display screen, and the light emitted by the display element 10 may be RGB monochromatic light or full-color light obtained by mixing RGB. Micro LEDs are LED scaling and matrixing technologies, which refer to a high-density and fine-scale LED array integrated on a chip, and have the greatest advantages of high brightness, high contrast and low power consumption of emitted light. The display element 10 is used to provide a high brightness, high contrast monochrome or RGB image.

The projection lens 21 is configured to collimate the light beam emitted by the display element 10 into a parallel light beam, and forms an optical projector together with the display element 10. The projection lens 21 may be one or more lenses, or a combination of reflective and transmissive optical elements, or the like.

The free prism combiner 23 may be composed of one or more prisms with a certain inverse transmittance ratio, and may reflect the light emitted from the display element 10 back into the human eye for a plurality of times.

The free prism combiner type AR glasses are similar in principle to the free-form surface element type AR glasses, and mainly constitute a display source, and a free combination prism group having reflection/transmission (R/T) values. The light emitted from the display device 10 directly enters the prism assembly 23 and is reflected back into the eye for a plurality of times. Multiple reflections may result in a portion of the light being lost. The greatest disadvantage of this type of design is the relatively large volume and the relatively high weight. If devices such as LCoS and DLP are used as image sources, the appearance is more clumsy, and the experience of a wearer is poor.

The light emitted from the display device 10 is focused or collimated by a projection lens 21, and the projection lens 21 may be one or more lenses, or a combination of a reflective optical element and a transmissive optical element.

The free prism group 23 may be composed of one prism or a plurality of prisms. The light collimated by the projection lens 21 enters human eyes after being reflected for many times.

Referring to the specification and fig. 6, the light emitted from the display device 10 is collimated by the projection lens 21 and then projected into the free prism group 23, and enters human eyes after being reflected for multiple times in the free prism group 23. External light can also enter the human eye through the free prism group 23.

Referring to fig. 7 of the specification, a fourth preferred embodiment of the AR display device based on Micro LEDs and the method for displaying the same, in which the Micro LEDs are applied to BirdBath (Bird Bath) type AR glasses, including but not limited to all kinds of BirdBath (Bird Bath) type AR glasses, is illustrated.

In the fourth preferred embodiment, the Micro LED-based AR display device and the imaging method thereof include a display element 10, a beam splitter 22 having a transmittance inverse ratio, and a combiner 40, wherein the display element 10 is adapted to emit light, the beam splitter 22 is used for reflecting the light emitted from the display element 10 to the combiner 40, and the combiner 40 is used for further reflecting the light reflected from the beam splitter 22 and reconverging the light into human eyes. Wherein ambient light is also able to enter the human eye through the combiner 40 and the beam splitter 22, the combiner 40 being a concave mirror combiner.

The light emitted from the display element 10 may be RGB monochromatic light or may be full-color light obtained by mixing RGB monochromatic light. Micro LEDs are LED scaling and matrixing technologies, which refer to a high-density and fine-scale LED array integrated on a chip, and have the greatest advantages of high brightness, high contrast and low power consumption of emitted light. The display element 10 is used to provide a high brightness, high contrast monochrome or RGB image.

The beam splitter 22 is a beam splitter 22 with a certain inverse transmittance ratio, which can be achieved by plating different films on the surface. Its function is to reflect light emitted by the display element 10 onto the concave mirror combiner and also to allow the human eye to see the external space.

Light emitted from a Bird Bath (Bird Bath) type AR glasses display element 10 is projected to a spectroscope 22, the spectroscope 22 has a reflection and transmission value (R/T), and a part of the light is reflected by the spectroscope 22, so that a user can simultaneously see a physical object of the real world and a superimposed image of a digital image generated by the display element 10. The reflected light is reflected by the beam splitter 22 and projected into the concave mirror combiner 40, and is again reflected by the combiner 40 to be redirected to the human eye.

Referring to fig. 7 of the specification, the light emitted from the display element 10 is projected onto the beam splitter 22, reflected by the beam splitter 22, projected onto the concave mirror combiner 40, and reflected by the concave mirror combiner 40 to enter human eyes. The external light can also enter the human eye through the concave mirror combiner 40 and the beam splitter 22.

Referring to fig. 8 of the drawings, a Micro LED-based AR display device and a method for displaying images thereof according to a fifth preferred embodiment of the present invention are illustrated, in which a dual compound display element 10 set and a flat combiner (flat combiner) type AR glasses set are used, including but not limited to the various AR glasses described in the drawings.

In the fifth preferred embodiment, the Micro LED-based AR display device includes a display element 10, a light combining element 30, a projection lens 21 and a beam splitter 22, where the display element 10 includes a dual-color Micro LED Micro display screen and a single-color Micro LED Micro display screen, the dual-color Micro LED Micro display screen and the single-color Micro LED Micro display screen are respectively used for emitting light, the light combining element 30 is used for combining the light emitted by the dual-color Micro LED Micro display screen and the single-color Micro LED Micro display screen, the light after light combining is collimated by the projection lens 21 and reflected to human eyes by the beam splitter 22, and external light can also enter human eyes by the beam splitter 22.

The double-color Micro LED Micro display screen can be a red-green Micro LED, a red-blue Micro LED or a blue-green Micro LED. The single-color Micro LED Micro display screen can be a blue Micro LED, a green Micro LED or a red Micro LED.

The light combining element 30 may be a planar optical element plated with a specific thin film, and is disposed at 45 ° and-45 ° with the two-color Micro LED Micro display screen and the single-color Micro LED Micro display screen, respectively. Due to the wavelength selectivity of the coating, the light combining element 30 reflects the light beams emitted by the double-color Micro LED Micro display screen and transmits the light beams emitted by the single-color Micro LED Micro display screen. Similarly, according to different coating methods, the light combining element 30 can also transmit the light beam emitted by the dual-color Micro LED Micro display screen and reflect the light beam emitted by the single-color Micro LED Micro display screen.

Referring to the accompanying drawing 9, the present invention provides a sixth preferred embodiment of AR display device based on Micro LED and its display method, which is described in the sixth preferred embodiment, the AR display device based on Micro LED and its display method includes a display element 10, a light combining element 30, a projection lens 21 and a spectroscope 22, wherein the display element 10 is a multi-compound Micro LED Micro display screen set, especially a Micro display screen set based on R, G, B three single color Micro LEDs, the display element 10 includes a first Micro display screen, a second Micro display screen and a third Micro display screen, wherein the first Micro display screen is a green Micro LED, the second Micro display screen is a blue Micro LED, and the third Micro display screen is a red Micro LED. Table 4 illustrates relevant parameters of the Micro LED Micro-display of the sixth preferred embodiment.

TABLE 4

Referring to fig. 10A of the specification, the light combining element 30 is an R, G, B color combining prism formed by gluing four right-angle prisms with specific optical films plated on them. Plating a red light reflecting film on the surface of a first diagonal surface A shown in the figure, and reflecting red light beams emitted by the red Micro LED and having the center direction along a first direction; the surface of the second diagonal surface B is plated with a blue light reflecting film for reflecting blue light beams emitted by the blue Micro LED along a second direction in the central direction; for a green light beam emitted by the green micro LED and having the center direction along the third direction, the color combination prism transmits the green light beam, and the propagation direction of the light beam is unchanged. Wherein, the surface A and the surface B are vertical to each other. R, G, B, the three single color images are incident on the color combination prism from the specific direction, the color combination becomes a RGB full color image, and the center direction of the combined image is along the third direction.

Fig. 10B shows a three-dimensional schematic view of the R, G, B color-combining prism. Fig. 10C shows the spectral distribution of the three-color Micro LED in this example. Fig. 10D shows the reflectance of the a-surface film layer for different wavelengths in this example. Fig. 10E shows the reflectance of the B-surface film layer for different wavelengths in this example.

Referring to fig. 9 of the specification, three single-color display elements 10 are combined by a color combining prism. The color-combination prism is made by bonding prisms with different coatings. Exhibit different transmission or reflection characteristics for different wavelengths of incident light. R, G, B, the three single color images are incident on the color combination prism from a specific direction, and the color combination becomes a single RGB full-color image. Taking fig. 9 as an example, a first film plated on the first surface of the color combining prism reflects the blue light beam emitted from the second microdisplay, and a second film plated on the second surface reflects the red light beam emitted from the third microdisplay, while the green light beam emitted from the first microdisplay passes through the color combining prism. According to different placement modes of the color combination prism, three single-color Micro LED Micro display screens are correspondingly placed at corresponding positions, and R, G, B three single-color images are guaranteed to be respectively incident to the color combination prism from specific directions. The RGB image optically combined by the color combining prism is collimated by the projection lens 21 and then reflected to human eyes by the beam splitter 22.

In order to illustrate the applicability of the Micro LED-based AR display device and the developing method thereof according to the present invention, examples of a flat combiner (flat combiner) type (e.g., fig. 1, 2, 3, 8, 9), a free-form surface element (moth eye) type (e.g., fig. 4, 5), a free prism combiner type (e.g., fig. 6), and a bird bath (bird bath) type (e.g., fig. 7) are given for the assembly of different types of devices, respectively.

More specifically, the AR display device includes a display element 10, a transmission element 20 and a light combining element 30. That is, the display element 10, the transmission element 20, and the light combining element 30 can be assembled to an AR device in a type of a flat combiner (fltcombiner) type (e.g., fig. 1, 2, 3, 8, 9), a free-form surface element (moth-eye) type (e.g., fig. 4, 5), a free prism combiner type (e.g., fig. 6), and a Bird Bath (Bird Bath) type (e.g., fig. 7), respectively. Of course, it can be assembled in other types of forms. The display element 10 is controlled to emit image information. Note that the display element 10 as an output device may be communicatively connected by wire or wirelessly. Preferably, the display element 10 is applied to AR glasses as a micro led micro display screen.

Further, the transmission element 20 includes a projection lens 21 and a beam splitter 22. The image light emitted from the display device 10 is processed by the projection lens 21, and then passes through the beam splitter 22 to display an image on a projection area 100. It should be noted that the image emitted by the display element 10 may be a full-color image or a monochrome image.

Specifically, the beam splitters 22 of the AR display device of a flat combiner (flat combiner) type are respectively flat plate type beam splitters 22, as shown in fig. 1; a beam splitter prism, as shown in FIG. 2; a beam splitter 22 with a certain transmittance ratio, as shown in fig. 3. After being condensed and/or collimated by the projection lens 21, the image light is reflected by the beam splitter 22 into the projection area 100. It should be noted that the external light can also pass through the beam splitter 22 to the projection area 100. Specific optical design parameters are as described above.

Specifically, the beam splitter 22 of the free-form surface element type AR display device is a curved beam splitter 22 having inverse transmittance ratios, respectively, as shown in fig. 4 and 5. It should be noted that the projection lens 21 in the preferred embodiment is optional, and is set according to the requirements of different optical designs. The light emitted from the display element 10 is directly projected onto the curved beam splitter 22 with the inverse transmittance ratio, and then reflected by the curved beam splitter 22 with the inverse transmittance ratio to enter the projection area 100. External light can also enter the projection area 100 through a curved beam splitter 22 with inverse transmittance ratio.

Specifically, the beam splitter 22 of the AR display device of the free prism combiner type employs a free prism group 23, as shown in fig. 6. The beam splitter 22 of the free prism group consists of a prism or a plurality of prisms. The light collimated by the projection lens 21 enters the projection area 100 through multiple reflections.

Specifically, the spectroscope 22 of the AR display device of Bird Bath (Bird Bath) type employs a spectroscope 22 having a certain transmittance ratio, as shown in fig. 7. More, the combiner 40 is a concave mirror combiner, and is disposed on the light-emitting side of the beam splitter 22. The image light emitted from the display element 10 is reflected by the beam splitter 22, projected onto the combiner 40 of the concave mirror, reflected by the light combining element 30 of the concave mirror, and enters the projection area 100. Ambient light can also enter the projection area 100 through the combiner 40 and the beam splitter 22 of the concave mirror.

The light combining element 30 is not only suitable for combining and emitting the external light and the image light, but also can be disposed between a plurality of the display elements 10 to provide a full-color image.

As shown in fig. 8 to 10, the display element 10 includes at least one monochromatic micro led. That is, a full-color image can be provided by using RGB full-color micro led display elements 10, or by using one two-color micro led display element 10 and one single-color micro led display element 10, or by using R, G, B three single-color micro led display elements 10. For convenience of description, a plurality of the display elements 10 are referred to herein as a first display element 11, a second display element 12, and a third display element 13, respectively.

As shown in fig. 8, the first display element 11 is a two-color mirco led, and specifically may be a red-green micro led, a red-blue micro led, or a blue-green micro led. The second display element 12 is a single color micro led, which may be a blue micro led, a green micro led or a red micro led, respectively. The first display element 11 and the second display element 12 are controlled to emit image light. The image light is combined by the light combining element 30, and the light combining element 30 is preferably a planar optical element coated with a specific film. Specific design parameters of the light combining element 30 are as described above, as shown in fig. 10A to 10E.

As shown in fig. 9, a development device based on R, G, B three single color micro leds. The light beams emitted by the first display element 11, the second display element 12, and the third display element 13 pass through the light combining element 30, are combined into an RGB full-color image, and are collimated by the projection lens 21 of the transmission element 20, and then input to the beam splitter 22.

The light combining element 30 in the embodiments shown in fig. 8 and 9 is applied to a planar combiner type AR display device as an example. It will be understood by those skilled in the art that other types of AR display devices may also adopt a combination design of the display element 10 and the light combining element 30, and other types of the light splitter 22 may be combined with the optical design of the light combining element 30, and the display element 10 and the light combining element 30 may be matched with the other types of the optical design of the light splitter 22. The details of these combined embodiments are not repeated, and the display element 10 based on the micro led and its control display can be mutually matched with the beam splitter 22 and the light combining element 30. In addition, as shown in fig. 11, the whole AR display device including the display element 10 and the transmission element 20 is schematically illustrated, and the AR display device includes a frame body 50, and the display element 10 and the transmission element 20 are supported by the frame body 50. The use scenario is shown in fig. 12, and not only the external object can be observed through the transmission element 20, but also the image of the display element 10 can be observed through the transmission element 20. That is, the light emitted from the display device 10 is directly projected onto the transmission device 20, and then reflected by the transmission device 20 and enters the projection area 100. External light can also enter the projection area 100 through the transmission element 20.

And, some micro LED micro display can show RGB three-colour full color image. Part of the micro LED micro displays can only display R, G, B single-color or double-color images, so that three single-color micro LED micro displays are irradiated to the same prism to be subjected to color combination, and the micro LED micro display group is named as a multi-composite micro LED micro display screen group. Aiming at the fact that part of the micro LED micro displays can simultaneously display two colors of RGB, a bicolor micro LED micro display and a monochromatic micro LED micro display can be simultaneously irradiated to the same prism to be subjected to color combination, and the micro LED micro display group is named as a double-composite micro LED micro display screen group.

The preferred embodiment provides a developing method comprising the steps of:

A. projecting image light by at least one micro LED;

B. collimating the image light; and

C. and reflecting the image light for projection to an external space to display an image.

Specifically, the AR display device includes the display element 10 and the projection lens 21. The display element 10 serves as an image source for displaying monochrome or RGB images, i.e. step a. The image light rays from the pixels of the image are collimated into parallel beams by the projection lens 21, i.e., step B. After being focused or collimated by the projection lens 21, the light is reflected to the human eye by the beam splitter 22, that is, step C.

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

It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.

Claims

1. An AR projection assembly based on Micro LEDs, comprising:

2. The projection assembly of claim 1, wherein the light combining element is a color combining prism.

3. The projection assembly of claim 1, wherein the light combining element is a thin film coated planar optical element.

4. The projection assembly of claim 1, wherein the light combining element is made of prism bonding with a coating.

5. The projection assembly of claim 1, wherein the configuration of the micro leds of the display element is selected from the group consisting of: the LED comprises a three-color MicroLED, at least three single-color MicroLEDs, at least one double-color MicroLED and a single-color MicroLED matched with the at least one double-color MicroLED.

6. The projection assembly of claim 5, wherein the display element comprises three single-color micro LEDs, and the light combining element transmits a portion of the light emitted by the single-color micro LEDs and reflects the remaining portion of the light emitted by the single-color micro LEDs so that the light emitted by the three single-color micro LEDs forms full-color image light after passing through the light combining element.

7. The projection assembly of claim 6, wherein the light combining element comprises four right-angle prisms coated with a coating and forms two orthogonal pairs of facets, wherein two of the single-color MicroLEDs respectively reach the two orthogonal pairs of facets and are reflected, and the other single-color MicroLED is transmitted by the right-angle prisms.

8. The projection assembly of claim 1, wherein the display element comprises a bi-color micro led and a single-color micro led, and the light combining element transmits light emitted from the single-color micro led and reflects light emitted from the bi-color micro led so that light emitted from the display element passes through the light combining element to form full-color image light.

9. The projection assembly of claim 1, wherein the display element comprises a bi-color micro led and a single-color micro led, and the light combining element reflects light emitted from the single-color micro led and transmits light emitted from the bi-color micro led, so that light emitted from the display element passes through the light combining element to form full-color image light.

10. The projection assembly of claim 8, wherein the light combining element comprises a planar optical element with a coating disposed at 45 ° and-45 ° to the bi-color micro leds and the mono-color micro leds, respectively.

11. The projection assembly of claim 9, wherein the light combining element comprises a planar optical element with a coating disposed at 45 ° and-45 ° to the bi-color micro leds and the mono-color micro leds, respectively.

12. A projection assembly according to any of claims 1 to 11, further comprising a projection lens for collimating light emitted by the display element.

13. The projection assembly of claim 12, wherein the projection lens comprises two convex lenses disposed one above the other for collimating light emitted from the display-based element.