A micro-projection display device and an AR display system having the same

Abstract

The present invention relates to a micro projection display device, which is characterized by comprising a projection light source, a PBS prism, a projection lens module, and an LCOS imaging chip; the projection light source is used for emitting a first polarized light; the PBS prism is used for transmitting the first polarized light emitted by the projection light source to the projection lens module; the projection lens module is used for focusing the first polarized light transmitted by the PBS prism onto the LCOS imaging chip; the LCOS imaging chip is used for modulating the first polarized light focused by the projection lens module into a second polarized light and emitting the modulated second polarized light to the PBS prism; the PBS prism is further used for reflecting the second polarized light emitted by the LCOS imaging chip; the projection light source, the PBS prism, the projection lens module, and the LCOS imaging chip are sequentially arranged along an axis.

Description

Technical Field

[0001] The present invention relates to the technical field of micro projectors, and particularly to a micro projection display device and an AR display system having the same. Background Art

[0002] The core design of a micro projection device lies in using as few lenses as possible to meet the image quality requirements while ensuring a small volume. Currently, an LCOS micro projector generally includes a projection illumination system, a PBS polarization beam splitter prism, an LCOS imaging chip, and a projection lens. Usually, the projection illumination system and the PBS polarization beam splitter prism are in a first direction, while the LCOS imaging chip, the PBS polarization beam splitter prism, and the projection lens are in a second direction, and the first direction and the second direction are perpendicular. Since the volumes of both the projection illumination system and the projection lens are relatively large, when the projection illumination system and the projection lens are vertically arranged, there is unused space between the projection illumination system and the projection lens, resulting in a large amount of space waste. At the same time, it causes the micro projector to have a large volume, making it difficult to be miniaturized, inconvenient to carry, and even more inconvenient to be incorporated into an AR display system. Moreover, when incorporated into an AR display system, a right-angle prism needs to be additionally provided in the optical path design to reflect the polarized light passing through the LCOS imaging chip and the projection lens to the waveguide, making the structure extremely complex. Summary of the Invention

[0003] The purpose of the present invention is to provide a micro projection display device and an AR display system having the same, so as to reduce the space waste in the projection system and at the same time make the spatial volume of the projection display device itself more flattened.

[0004] The purpose of the present invention is achieved by adopting the following technical solutions. A micro projection display device according to the present invention includes a projection light source, a PBS prism, a projection lens module, and an LCOS imaging chip; the projection light source is used for emitting a first polarized light; the PBS prism is used for transmitting the first polarized light emitted by the projection light source to the projection lens module; the projection lens module is used for focusing the first polarized light transmitted by the PBS prism onto the LCOS imaging chip; the LCOS imaging chip is used for modulating the first polarized light focused by the projection lens module into a second polarized light and emitting the modulated second polarized light to the PBS prism; the PBS prism is further used for reflecting the second polarized light emitted by the LCOS imaging chip; the projection light source, the PBS prism, the projection lens module, and the LCOS imaging chip are sequentially arranged along an axis.

[0005] The purpose of the present invention can also be further realized by adopting the following technical measures.

[0006] The aforementioned micro-projection display device, wherein the projection light source includes an LED light source group, an LED collimating lens group, an aperture stop, and a polarizer; the LED light source group is used to generate a light source; the LED collimating lens group is used to collimate the light source generated by the LED light source group; the aperture stop is used to intercept invalid light or stray light in the light source collimated by the LED collimating lens group; the polarizer is used to polarize the light source intercepted by the aperture stop into the first polarized light.

[0007] The aforementioned micro-projection display device, wherein the projection light source is a laser light source capable of emitting the first polarized light.

[0008] The aforementioned micro-projection display device, wherein the micro-projection display device further includes a quarter-wave plate and an analyzer; the quarter-wave plate is used to filter out stray light in the first polarized light transmitted by the PBS prism; the analyzer is used to detect the first polarized light from which stray light has been filtered by the quarter-wave plate, and the quarter-wave plate and the analyzer are sequentially arranged between the PBS prism and the projection lens module.

[0009] The aforementioned micro-projection display device, wherein the LED light source group is an LED white light source group, and the LCOS imaging chip is an LCOS imaging chip with a color filter.

[0010] The aforementioned micro-projection display device, wherein the projection lens module is further used to project the second polarized light emitted by the LCOS imaging chip onto the PBS prism and reflect it to a target screen or the human eye through the PBS prism.

[0011] The aforementioned micro-projection display device, wherein the LED light source group is a first-color LED light source, a second-color LED light source, and a third-color LED light source, the LCOS imaging chip is an LCOS imaging chip without a color filter, the LED collimating lens group includes a first collimator, a second collimator, a first beam splitter for transmitting the first-color LED light source and the second-color LED light source and reflecting the third-color LED light source, and a second beam splitter for transmitting the first-color LED light source and the third-color LED light source and reflecting the second-color LED light source, the first-color LED light source, the first collimator, the first beam splitter, and the second beam splitter are arranged along the direction of the axis, the first beam splitter and the second beam splitter are respectively inclined, and the second-color LED light source and the third-color LED light source are arranged in a direction perpendicular to the axis of the first beam splitter and the second beam splitter.

[0012] The foregoing micro-projection display device, wherein the LED light source group is a first-color LED light source, a second-color LED light source, and a third-color LED light source, the LCOS imaging chip is an LCOS imaging chip without a color filter, and the LED collimating lens group includes a first collimator, a first beam splitter for transmitting the first-color LED light source and the second-color LED light source and reflecting the third-color LED light source, a second beam splitter for transmitting the first-color LED light source and the third-color LED light source and reflecting the second-color LED light source, and a third beam splitter for transmitting the third-color LED light source and reflecting the first-color LED light source and the second-color LED light source. The first-color LED light source, the second-color LED light source, and the third-color LED light source and the first collimator are arranged in a direction perpendicular to the axis of the first beam splitter, the second beam splitter, and the third beam splitter, and the first beam splitter, the second beam splitter, and the third beam splitter are inclined in the direction of the axis.

[0013] The foregoing micro-projection display device, wherein the first polarized light is P-polarized light and the second polarized light is S-polarized light.

[0014] The present invention further provides a micro-projection display device and an optical waveguide as described above, and the micro-projection display device is optically coupled to the optical waveguide.

[0015] The beneficial effects of the present invention at least include: the projection light source, the PBS prism, the projection lens module, and the LCOS imaging chip are sequentially arranged along an axis, reducing the space waste in the micro-projection device, and at the same time making the space volume of the micro-projection device itself more flattened, facilitating subsequent miniaturization design. In addition, when applied to an AR display system, the LCOS imaging chip modulates the first polarized light into the second polarized light and emits the modulated second polarized light to the PBS prism. The PBS prism can directly reflect the second polarized light to the optical waveguide, eliminating the need for an additional right-angle prism to reflect the second polarized light to the optical waveguide, and at the same time applying the transmission and reflection functions of the PBS prism, so that on the basis of realizing the same functions of the AR display system, fewer lenses are used.

[0016] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the details are described as follows. Description of the Drawings

[0017] Figure 1 A schematic structural diagram of a micro-projection display device according to a first embodiment of the present invention;

[0018] Figure 2 It is a schematic structural diagram of an AR display system according to the first embodiment of the present invention;

[0019] Figure 3 It is a schematic structural diagram of a micro-projection display device and an AR display system according to the second embodiment of the present invention;

[0020] Figure 4 It is a schematic structural diagram of a micro-projection display device and an AR display system according to the fourth embodiment of the present invention. Detailed implementation manners

[0021] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following combines the accompanying drawings and preferred embodiments to detail the specific implementation manners, structures, features and effects of the micro-projection display device proposed according to the present invention as follows.

[0022] Figure 1 It is a schematic structural diagram of a micro-projection display device according to the first embodiment of the present invention;

[0023] Figure 2 It is a schematic structural diagram of an AR display system according to the first embodiment of the present invention; Figure 3 It is a schematic structural diagram of a micro-projection display device and an AR display system according to the second embodiment of the present invention; Figure 4 It is a schematic structural diagram of a micro-projection display device and an AR display system according to the fourth embodiment of the present invention. For ease of description, the axial directions of each component are shown in each figure.

[0024] Figure 1A micro-projection display device according to a first embodiment of the present invention is shown, including a projection light source 1 for emitting first polarized light, a PBS prism 2, a projection lens module 3, and an LCOS imaging chip 4. Among them, the projection light source 1 is used to emit first polarized light, the PBS prism 2 is used to transmit the first polarized light emitted by the projection light source 1 to the projection lens module 3, the projection lens module 3 is used to focus the first polarized light transmitted by the PBS prism 2 onto the LCOS imaging chip 4, the LCOS imaging chip 4 is used to modulate the first polarized light focused by the projection lens module into second polarized light (including image information), and emit the modulated second polarized light to the projection lens module 3. The projection lens module 3 is also used to project the second polarized light emitted by the LCOS imaging chip 4 onto the PBS prism 2. The PBS prism 2 is also used to reflect the second polarized light emitted by the LCOS imaging chip 4 and projected by the projection lens module 3 onto the target screen or the human eye. The projection light source 1, the PBS prism 2, the projection lens module 3, and the LCOS imaging chip 4 are arranged in sequence along an axis. The projection light source 1, the PBS prism 2, the projection lens module 3, and the LCOS imaging chip 4 are arranged in sequence along an axis, reducing the space waste in the micro-projection device and making the spatial volume of the micro-projection device itself more flattened, facilitating subsequent miniaturization design. In addition, when applied to an AR display system, after the LCOS imaging chip 4 modulates the first polarized light into second polarized light and emits the modulated second polarized light to the PBS prism 2, the PBS prism 2 can directly reflect the second polarized light to the optical waveguide 7, thus eliminating the need for an additional right-angle prism to reflect the second polarized light to the optical waveguide 7. Therefore, the AR display system of the present invention simultaneously applies the transmission and reflection functions of the PBS prism 2, and uses fewer lenses on the basis of realizing the functions of the same AR display system.

[0025] Exemplarily, the first polarized light can be P-polarized light or S-polarized light. Correspondingly, when the first polarized light is P-polarized light, the second polarized light is S-polarized light, and when the first polarized light is S-polarized light, the second polarized light is P-polarized light. According to different coating processes, the beam-splitting surface of the PBS prism can exhibit different transmission and reflection functions. For example, the PBS prism can transmit P-polarized light and reflect S-polarized light, or transmit S-polarized light and reflect P-polarized light. In this embodiment, a PBS prism that can transmit P-polarized light and reflect S-polarized light is used, and the PBS prism can be inclined along the axis direction and form a 45° angle with the axis to achieve the transmission of P-polarized light and the reflection of S-polarized light. Correspondingly, when the first polarized light in this embodiment is P-polarized light, the second polarized light is S-polarized light. The LCOS imaging chip 4 can modulate P-polarized light into S-polarized light and emit it, or modulate S-polarized light into P-polarized light and emit it, which can be achieved by setting according to needs.

[0026] Furthermore, as Figure 1As shown in the figure, the projection light source 1 includes an LED light source group 11, an LED collimating lens group 12, an aperture stop 13, and a polarizer 14. Among them, the LED light source group 1 is used to generate a light source, the LED collimating lens group 2 is used to collimate the light source generated by the LED light source group 1, the aperture stop 13 is used to intercept invalid light or stray light in the light source collimated by the LED collimating lens group 12, and the polarizer 14 is used to polarize the light source that has intercepted invalid light or stray light by the aperture stop 13 into a first polarized light. Alternatively, the projection light source 1 can also be a light source that can directly emit the first polarized light, such as a laser light source.

[0027] Exemplarily, the size of the aperture stop 13 can be adjusted as needed. Optionally, a light homogenizing device (not shown in the figure) can also be provided between the collimating lens group 12 and the aperture stop 13. The light homogenizing device is a solid cuboid or conical light bar, or a hollow cuboid or cone surrounded by four reflecting mirrors. The LED collimating lens group 12 is composed of collimators for collimating the light source. The collimator can optionally be composed of three spherical glass lenses, or one spherical glass lens and one plastic aspherical lens, or two plastic aspherical lenses. The polarizer 14 can polarize the light source that has intercepted invalid light or stray light by the aperture stop 13 into P-polarized light or S-polarized light as needed. In this embodiment, the polarizer 14 polarizes the light source that has intercepted invalid light or stray light by the aperture stop 14 into P-polarized light, but the present invention is not limited thereto.

[0028] Furthermore, the LED light source group 11 can generate natural light, which is characterized by low power, no infrared and ultraviolet rays in the emitted light, long service life, energy conservation and environmental protection, and slow attenuation of the light source. The present invention describes different embodiments with the LED light source group 11 being an LED white light source group and an RGB multi-chip integrated LED light source group.

[0029] Furthermore, the projection lens module 3 includes a plurality of lenses, and each lens group can be a plastic lens or a glass lens.

[0030] Furthermore, as Figure 1 shown, the micro-projection display device further includes a quarter-wave plate 5 and an analyzer 6. The quarter-wave plate 5 is used to filter out the stray light in the first polarized light transmitted through the PBS prism 2, and the analyzer 6 is used to detect the first polarized light from which the stray light has been filtered out by the quarter-wave plate. Preferably, the quarter-wave plate 5 and the analyzer 6 are coaxially arranged in sequence between the PBS prism 2 and the projection lens module 3.

[0031] Furthermore, in Figure 1In the first embodiment of the present invention as shown, the LED light source group 11 is an LED white light source group. After the white light emitted by it is collimated by the collimating lens group 12, part of the invalid light and stray light are intercepted by the aperture stop 13, and then polarized P light is obtained through polarization by the polarizer 14. Subsequently, the polarized P light sequentially passes through the PBS prism 2 (transmitting polarized P light and reflecting polarized S light), the quarter-wave plate 5, the analyzer 6, and the projection lens module 3 and is incident on the LCOS imaging chip 4. Then, the LCOS imaging chip modulates the polarized P light into polarized S light and emits it. Subsequently, the polarized S light sequentially passes through the projection lens module 3, the analyzer 6, the quarter-wave plate 5, and the PBS prism 2, and the PBS prism 2 reflects the polarized S light to the human eye or the screen. Optionally, as Figure 2 shown, when the above micro-projection display device is applied to the AR display system, the PBS prism 2 can reflect the polarized S light to the optical waveguide 7. The optical waveguide 7 can use one of a diffractive optical waveguide, an array optical waveguide, and a geometric optical waveguide, preferably a diffractive optical waveguide. The polarized S light is transmitted in the optical waveguide 7 and finally enters the human eye from the other side of the optical waveguide 7. In one or more embodiments, the light guiding direction of the optical waveguide can be made parallel to the axis where the projection light source, the PBS prism, the projection lens module, and the LCOS imaging chip are located in the micro-projection display device, so as to reduce the volume of the entire AR display system.

[0032] Optionally, an aperture stop can be provided on the optical waveguide 7 to further intercept part of the invalid light and stray light. In this embodiment, the LCOS imaging chip 4 is an LCOS imaging chip with a color filter.

[0033] Furthermore, Figure 3Shows a second embodiment of a micro-projection display device and an AR display system according to the present invention. Among them, the LED light source group 11 is an RGB multi-chip integrated LED light source group. In this embodiment, the LCOS imaging chip 4 is an LCOS imaging chip without a color filter. The LED light source group 11 includes an LED green light source group 111, an LED red light source group 112, and an LED blue light source group 113. In this embodiment, the LED collimating lens group 12 includes a first collimator 121, a second collimator 122, a red-green transmitting and blue-reflecting beam splitter 123, and a blue-green transmitting and red-reflecting beam splitter 124. As shown in the figure, the LED green light source group 111, the first collimator 121, the red-green transmitting and blue-reflecting beam splitter 123, and the blue-green transmitting and red-reflecting beam splitter 124 are arranged in sequence along the axis direction. Among them, the red-green transmitting and blue-reflecting beam splitter 123 and the blue-green transmitting and red-reflecting beam splitter 124 are respectively inclined (for example, the red-green transmitting and blue-reflecting beam splitter 123 and the blue-green transmitting and red-reflecting beam splitter 124 are respectively at 45° and 60° with the axis direction). The LED red light source group 112 and the LED blue light source group 113 are arranged side by side and are arranged above the red-green transmitting and blue-reflecting beam splitter 123 and the blue-green transmitting and red-reflecting beam splitter 124 in a direction perpendicular to the axis together with the second collimator 122. The light emitted by the LED green light source group 111 is collimated by the first collimator 121, and then transmitted through the red-green transmitting and blue-reflecting beam splitter 123 and the blue-green transmitting and red-reflecting beam splitter 124 to the polarizer 14; the light emitted by the LED red light source group 112 is collimated by the second collimator 122, transmitted through the red-green transmitting and blue-reflecting beam splitter 123 to the blue-green transmitting and red-reflecting beam splitter 124, and reflected by the blue-green transmitting and red-reflecting beam splitter 124 to the polarizer 14; the light emitted by the LED blue light source group 113 is collimated by the second collimator 122, transmitted through the blue-green transmitting and red-reflecting beam splitter 124 to the red-green transmitting and blue-reflecting beam splitter 123, and then reflected by the red-green transmitting and blue-reflecting beam splitter 123 to the polarizer 14. The light propagation paths of the LED green light source group 111, the LED red light source group 112, and the LED blue light source group 113 after passing through the polarizer 14 are the same as the corresponding light propagation paths in the first embodiment of the present invention, and will not be elaborated here.

[0034] It can be understood that in this second embodiment, the LED red light source group 112 and the LED blue light source group 113 can also be arranged in a staggered manner instead of side by side, and can also be arranged below the blue-green transmitting and red-reflecting beam splitter 124 and the red-green transmitting and blue-reflecting beam splitter 123 together with the second collimator 122 in a direction perpendicular to the axis. In this case, adjusting the relative positions of the blue-green transmitting and red-reflecting beam splitter 124 and the red-green transmitting and blue-reflecting beam splitter 123 accordingly can also achieve equivalent light path propagation.

[0035] In the third embodiment of the present invention (not shown in the drawings), the LED blue light source group, the first collimator, the blue-green transmitting and red-reflecting beam splitter, and the blue-red transmitting and green-reflecting beam splitter are sequentially arranged along the axial direction. The blue-green transmitting and red-reflecting beam splitter and the blue-red transmitting and green-reflecting beam splitter are respectively arranged obliquely. The LED red light source group and the LED green light source group are arranged side by side and are arranged above the blue-green transmitting and red-reflecting beam splitter and the blue-red transmitting and green-reflecting beam splitter in a direction perpendicular to the axial direction together with the second collimator. The light emitted by the LED blue light source group is collimated by the first collimator and then transmitted through the blue-green transmitting and red-reflecting beam splitter and the blue-red transmitting and green-reflecting beam splitter to the polarizer. The light emitted by the LED red light source group is collimated by the second collimator, transmitted through the blue-red transmitting and green-reflecting beam splitter to the blue-green transmitting and red-reflecting beam splitter, and reflected by the blue-green transmitting and red-reflecting beam splitter to the polarizer; the light emitted by the LED green light source group is collimated by the second collimator, transmitted through the blue-green transmitting and red-reflecting beam splitter to the blue-red transmitting and green-reflecting beam splitter, and then reflected by the blue-red transmitting and green-reflecting beam splitter to the polarizer. The light propagation paths of the LED green light source group, the LED red light source group, and the LED blue light source group after passing through the polarizer are the same as the corresponding light propagation paths in the first embodiment of the present invention, and will not be described in detail.

[0036] It can be understood that in the third embodiment of the present invention, the LED red light source group and the LED green light source group can also be arranged in a staggered manner instead of side by side, and can also be arranged below the blue-green transmitting and red-reflecting beam splitter and the blue-red transmitting and green-reflecting beam splitter in a direction perpendicular to the axis together with the second collimator. In this case, adjusting the relative positions of the blue-green transmitting and red-reflecting beam splitter and the blue-red transmitting and green-reflecting beam splitter accordingly can also achieve equivalent light path propagation. In this embodiment, the LCOS imaging chip is an LCOS imaging chip without a color filter.

[0037] Furthermore, Figure 4The fourth embodiment of the micro-projection display device and the AR display system according to the present invention is shown. In this embodiment, the LED light source group 11 is an RGB multi-chip integrated LED light source, including an LED green light source group 111, an LED red light source group 112, and an LED blue light source group 113. In this embodiment, the LED collimating lens group 12 includes a first collimator 121, a green and red transmitting and blue reflecting beam splitter 123, a blue and green transmitting and red reflecting beam splitter 124, and a blue transmitting and green and red reflecting beam splitter 125. As shown in the figure, the LED green light source group 111, the LED red light source group 112, and the LED blue light source group 113 are arranged side by side and are disposed above the green and red transmitting and blue reflecting beam splitter 123, the blue and green transmitting and red reflecting beam splitter 124, and the blue transmitting and green and red reflecting beam splitter 125 together with the first collimator 121 in a direction perpendicular to the axis. The green and red transmitting and blue reflecting beam splitter 123, the blue transmitting and green and red reflecting beam splitter 125, and the blue and green transmitting and red reflecting beam splitter 124 are sequentially inclined in the axial direction. In this embodiment, the light emitted by the LED green light source group 111 is collimated by the first collimator 121, then transmitted through the blue and green transmitting and red reflecting beam splitter 124 to the blue transmitting and green and red reflecting beam splitter 125, and then reflected by the blue transmitting and green and red reflecting beam splitter 125 to the polarizer 14; the light emitted by the LED red light source group 112 is collimated by the first collimator 121 and reflected by the blue and green transmitting and red reflecting beam splitter 124 to the polarizer 14; the light emitted by the LED blue light source group 113 is collimated by the first collimator 121, transmitted through the blue and green transmitting and red reflecting beam splitter 124 and the blue transmitting and green and red reflecting beam splitter 125 to the green and red transmitting and blue reflecting beam splitter 123, and then reflected by the green and red transmitting and blue reflecting beam splitter 123 to the polarizer 14. After passing through the polarizer 14, the light propagation paths of the LED green light source group 111, the LED red light source group 112, and the LED blue light source group 113 are the same as the corresponding light propagation paths in the first embodiment of the present invention, and will not be elaborated here.

[0038] It can be understood that in the fourth embodiment of the present invention, the LED green light source group 111, the LED red light source group 112, and the LED blue light source group 113 can also be arranged in a staggered manner instead of side by side, and can also be disposed below the blue and green transmitting and red reflecting beam splitter 124, the blue transmitting and green and red reflecting beam splitter 125, and the green and red transmitting and blue reflecting beam splitter 123 together with the first collimator 121 in a direction perpendicular to the axis. In this case, by correspondingly adjusting the relative positions of the blue and green transmitting and red reflecting beam splitter 124, the blue transmitting and green and red reflecting beam splitter 125, and the green and red transmitting and blue reflecting beam splitter 123, an equivalent light path propagation can also be achieved. In this embodiment, the LCOS imaging chip is an LCOS imaging chip without a color filter.

[0039] The above embodiments are only introductions to the micro - projection device. It can be understood that the technical solution of the present invention is not only used for the micro - projection device, but can also be applied to various optical systems to reduce space waste, and at the same time make the space volume of the optical system itself more flattened, which is convenient for subsequent miniaturization design. For example, it can be applied to a light - curing printer.

[0040] As mentioned above, the beneficial effects of the present invention at least include: the projection light source, the PBS prism, the projection lens module, and the LCOS imaging chip are arranged in sequence along an axis, which reduces the space waste in the micro - projection device, and at the same time makes the space volume of the micro - projection device itself more flattened, which is convenient for subsequent miniaturization design. In addition, when applied to an AR display system, the LCOS imaging chip modulates the first polarized light into the second polarized light and emits the modulated second polarized light to the PBS prism. The PBS prism can directly reflect the second polarized light to the optical waveguide, eliminating the need for an additional right - angle prism to reflect the second polarized light to the optical waveguide. At the same time, the transmission and reflection functions of the PBS prism are applied, so that on the basis of realizing the same functions of the AR display system, fewer lenses are used.

[0041] The basic principles of the present invention have been described above in combination with specific embodiments. However, it should be noted that the advantages, advantages, effects, etc. mentioned in the present invention are only examples and not limitations. It cannot be considered that these advantages, advantages, effects, etc. are essential for each embodiment of the present invention. In addition, the above - disclosed specific details are only for illustrative and easy - to - understand purposes, rather than limitations. The above details do not limit the present invention to necessarily adopt the above - specific details to implement.

[0042] The block diagrams of the devices and apparatuses involved in the present invention are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any way. Words such as "including", "comprising", "having", etc. are open - ended words, meaning "including but not limited to", and can be used interchangeably with each other. The words "or" and "and" used here refer to the word "and / or" and can be used interchangeably with it, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to" and can be used interchangeably with it.

[0043] The above description of the disclosed aspects enables any person skilled in the art to make or use the present invention. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present invention. Therefore, the present invention is not intended to be limited to the aspects shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A micro projection display device, characterized in that, It includes a projection light source, a PBS prism, a projection lens module, and an imaging chip; The projection light source is used to emit first polarized light; The PBS prism is used to transmit the first polarized light emitted by the projection light source to the projection lens module; The projection lens module is used to focus the first polarized light transmitted by the PBS prism onto the imaging chip; The imaging chip is used to modulate the first polarized light focused by the projection lens module into second polarized light and emit the modulated second polarized light to the PBS prism; the PBS prism is also used to reflect the second polarized light emitted by the imaging chip; the projection light source, the PBS prism, the projection lens module, and the imaging chip are sequentially arranged along an axis.

2. The micro-projection display device according to claim 1, wherein The projection light source includes an LED light source group, an LED collimating lens group, an aperture stop, and a polarizer; The LED light source group is used to generate a light source; The LED collimating lens group is used to collimate the light source emitted by the LED light source group; The aperture stop is used to intercept invalid light or stray light in the light source collimated by the LED collimating lens group; The polarizer is used to polarize the light source that has passed through the aperture stop to intercept invalid light or stray light into the first polarized light.

3. The micro-projection display device according to claim 1, wherein The projection light source is a laser light source capable of emitting the first polarized light.

4. The micro-projection display device according to claim 2, characterized in that, The micro-projection display device further includes a quarter-wave plate and an analyzer, The quarter-wave plate is used to filter out stray light in the first polarized light transmitted by the PBS prism; the analyzer is used to detect the first polarized light from which stray light has been filtered out by the quarter-wave plate; the quarter-wave plate and the analyzer are sequentially arranged between the PBS prism and the projection lens module.

5. The micro-projection display device according to claim 4, wherein The projection lens module is also used to project the second polarized light emitted by the imaging chip onto the PBS prism and reflect it to a target screen or the human eye through the PBS prism.

6. The micro-projection display device according to claim 5, wherein, The LED light source group is an LED white light source group, and the imaging chip is an LCOS imaging chip with a color filter.

7. The micro-projection display device according to claim 5, wherein, The LED light source group is a first-color LED light source, a second-color LED light source, and a third-color LED light source, the imaging chip is an LCOS imaging chip without a color filter, the LED collimating lens group includes a first collimator, a second collimator, a first beam splitter for transmitting the first-color LED light source and the second-color LED light source and reflecting the third-color LED light source, and a second beam splitter for transmitting the first-color LED light source and the third-color LED light source and reflecting the second-color LED light source. The first-color LED light source, the first collimator, the first beam splitter, and the second beam splitter are arranged along the direction of the axis. The first beam splitter and the second beam splitter are respectively inclined. The second-color LED light source and the third-color LED light source are arranged in a direction perpendicular to the axis of the first beam splitter and the second beam splitter.

8. The micro-projection display device according to claim 5, wherein The LED light source group is a first-color LED light source, a second-color LED light source, and a third-color LED light source. The imaging chip is an LCOS imaging chip without a color filter. The LED collimating lens group includes a first collimator, a first beam splitter for transmitting the first-color LED light source and the second-color LED light source and reflecting the third-color LED light source, a second beam splitter for transmitting the first-color LED light source and the third-color LED light source and reflecting the second-color LED light source, and a third beam splitter for transmitting the third-color LED light source and reflecting the first-color LED light source and the second-color LED light source. The first-color LED light source, the second-color LED light source, and the third-color LED light source and the first collimator are arranged in a direction perpendicular to the axis of the first beam splitter, the second beam splitter, and the third beam splitter. The first beam splitter, the second beam splitter, and the third beam splitter are arranged along the axis direction.

9. The micro-projection display device according to any one of claims 1-8, characterized in that, The first polarized light is P-polarized light, and the second polarized light is S-polarized light.

10. An AR display system, characterized in that It includes the micro-projection display device according to any one of claims 1-9 and an optical waveguide, and the micro-projection display device is optically coupled to the optical waveguide.

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