Display device and glasses

Abstract

Display equipment and glasses are disclosed, the display equipment comprises a screen, a polaroid and an electrically tunable half-wave plate, the screen and the polaroid are stacked, the electrically tunable half-wave plate is arranged on one side, away from the screen, of the polaroid, and the polaroid is used for converting light of the screen into light in a first polarization state or light in a second polarization state; the electrically tunable half-wave plate has a closed state and an open state and is used for mutually switching the closed state and the open state according to a time sequence period; the electrically tunable half-wave plate is used for converting the light in the first polarization state into the light in the second polarization state when in the open state, or the electrically tunable half-wave plate is used for converting the light in the second polarization state into the light in the first polarization state when in the open state; the electrically tunable half-wave plate is used for allowing the light in the first polarization state or the light in the second polarization state to pass through in the closed state, and the polarization directions of the light in the first polarization state and the light in the second polarization state are different.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display device and glasses. Background Technology

[0002] Extended reality (XR) display technology uses display devices to overlay virtual information onto the real world, enabling real environments and virtual objects to be superimposed in real time, thus complementing each other. Display devices can also present parallax-effect virtual scenes to create a 3D effect.

[0003] Current display devices require two screens to display parallax images to achieve a 3D effect, resulting in high manufacturing costs; alternatively, existing display devices have fewer light reflections during transmission, making them thicker. Summary of the Invention

[0004] This application provides a display device and glasses that can present a 3D effect through a single screen, or increase the number of reflections when transmitting light in the display device to reduce the thickness of the display device.

[0005] This application provides a display device comprising a screen, a polarizer, and an electrically tunable half-wave plate. The screen and the polarizer are stacked together. The electrically tunable half-wave plate is disposed on the side of the polarizer away from the screen. The polarizer is used to convert light from the screen into light of a first polarization state or light of a second polarization state. The electrically tunable half-wave plate has an off state and an on state, and is used to switch between the off state and the on state according to a timing period. When the electrically tunable half-wave plate is on, it is used to convert light of the first polarization state into light of the second polarization state, or when the electrically tunable half-wave plate is on, it is used to convert light of the second polarization state into light of the first polarization state. When the electrically tunable half-wave plate is off, it allows light of the first polarization state or light of the second polarization state to pass through, wherein the polarization directions of the first polarization state light and the second polarization state light are different.

[0006] In this solution, the electrically tunable half-wave plate can switch between an off state and an on state according to a timing cycle. When the half-wave plate is off, light of the first polarization state passes through; when it is on, it converts the light of the first polarization state to light of the second polarization state. The electrically tunable half-wave plate can distinguish the polarization direction of light producing different images according to the timing cycle, facilitating the splitting of light rays producing different images along the optical transmission path, thus allowing the user's eyes to see different images through the display device. These different images can be images with parallax.

[0007] In conjunction with the first aspect, in one possible implementation, the display device further includes a polarizing beam splitter, the electrically tunable half-wave plate includes a first electrically tunable half-wave plate, the first electrically tunable half-wave plate and the polarizer are stacked together, the first electrically tunable half-wave plate is located on the side of the polarizer away from the screen, and the polarizing beam splitter is located on the side of the first electrically tunable half-wave plate away from the polarizer; the timing period includes a first timing period, the screen is used to generate a first virtual image and a second virtual image according to the first timing period; the polarizer is used to convert the light generated by the screen to the first virtual image or the second virtual image into the first... The first electrically tunable half-wave plate has a closed state and an open state, and is used to switch between the closed state and the open state according to a first timing period; when the first electrically tunable half-wave plate is in the closed state, it is used to allow the first polarized light that generates the first virtual image to pass through, and when the first electrically tunable half-wave plate is in the open state, it is used to convert the first polarized light that generates the second virtual image into the second polarized light; the polarizing beam splitter is used to split the first polarized light that generates the first virtual image and the second polarized light that generates the second virtual image into different optical transmission paths.

[0008] In this solution, the display device uses a screen to emit light that generates a first and a second virtual image in a time-division manner. The screen emits light that generates the first and second virtual images according to a first timing cycle. A polarizer converts the light that generates the first and second virtual images into light with a first polarization state. A first electrically tunable beam splitter switches between an off state and an on state according to the first timing cycle. This allows the light with the first polarization state entering the polarizing beam splitter to generate the first virtual image, and the light with the second polarization state entering the polarizing beam splitter to generate the second virtual image. The polarizing beam splitter allows the light that generates the first and second virtual images to enter the user's eyes separately, providing the user with a three-dimensional dynamic simulation experience. Since the display device only needs to use a single screen, the cost of the display device can be reduced.

[0009] In conjunction with the first aspect, in one possible implementation, the polarizing beam splitter includes a first polarizing beam splitter; the first polarizing beam splitter is used to allow light of the first polarization state that generates the first virtual image to pass through, and the first polarizing beam splitter is also used to reflect light of the second polarization state that generates the second virtual image; or, the first polarizing beam splitter is used to reflect light of the first polarization state that generates the first virtual image, and the first polarizing beam splitter is also used to allow light of the second polarization state that generates the second virtual image to pass through. By using the first polarizing beam splitter to allow either the first polarization state light or the second polarization state light to pass through and to reflect the other of the first polarization state light or the second polarization state light, the light of the first polarization state that generates the first virtual image and the light of the second polarization state that generates the second virtual image can be split, so that the user's two eyes can see the first virtual image and the second virtual image respectively.

[0010] In conjunction with the first aspect, in one possible implementation, the display device further includes a first quarter-wave plate disposed on the side of the polarizing beam splitter away from the first electrically tunable half-wave plate; the first quarter-wave plate is used to convert reflected light of a first polarization state into light of a second polarization state; or, the first quarter-wave plate is used to convert reflected light of a second polarization state into light of a first polarization state. If the first polarizing beam splitter allows light of a first polarization state to pass through, and reflects light of a second polarization state, the first quarter-wave plate can convert the reflected light of the first polarization state into light of the second polarization state, so that the light split by the polarizing beam splitter to two different light transmission paths maintains the same polarization direction, thereby enabling the two light transmission paths of the display device to adopt the same structure. If the first polarizing beam splitter allows light of a second polarization state to pass through, and reflects light of a first polarization state, the first quarter-wave plate can convert the reflected light of the second polarization state into light of the first polarization state, so that the light split by the polarizing beam splitter to two different light transmission paths maintains the same polarization direction, thereby enabling the two light transmission paths of the display device to adopt the same structure.

[0011] In conjunction with the first aspect, in one possible implementation, the first quarter-wave plate and the first polarizing beam splitter are at an angle, and the first polarizing beam splitter is used to reflect light of the second polarization state obtained by the first quarter-wave plate, or the first polarizing beam splitter is also used to reflect light of the first polarization state obtained by the first quarter-wave plate.

[0012] Because there is an angle between the first quarter-wave plate and the first polarizing beam splitter, the first polarizing beam splitter can split the light obtained from the first quarter-wave plate (light in the first polarization state or light in the second polarization state) and the light emitted from the first electrically tunable half-wave plate (light in the first polarization state or light in the second polarization state) into different optical transmission channels.

[0013] In conjunction with the first aspect, in one possible implementation, the polarizing beam splitter includes a first polarizing beam splitter and a second polarizing beam splitter. The first polarizing beam splitter and the second polarizing beam splitter are connected and cross-arranged. The first polarizing beam splitter and the electrically tunable half-wave plate are at an angle to each other, and the second polarizing beam splitter and the electrically tunable half-wave plate are at an angle to each other. The first polarizing beam splitter is used to allow light of a first polarization state from a first virtual scene to pass through, and the second polarizing beam splitter is used to reflect light of the first polarization state from the first virtual scene. The second polarizing beam splitter is used to allow light of a second polarization state from a second virtual scene to pass through, and the first polarizing beam splitter is used to reflect light of the second polarization state from the second virtual scene.

[0014] In this scheme, since there is an angle between the first polarizing beam splitter and the electrically tunable half-wave plate, and there is an angle between the second polarizing beam splitter and the electrically tunable half-wave plate, the polarizing beam splitter can split the light rays (light rays in the first polarization state or light rays in the second polarization state) emitted from the first electrically tunable half-wave plate into different optical transmission channels.

[0015] In conjunction with the first aspect, in one possible implementation, the display device further includes a first reflector and a second reflector spaced apart, with the polarizing beam splitter disposed between the first reflector and the second reflector. The first reflector is used to reflect light of a first polarization state or light of a second polarization state obtained by the first quarter-wave plate; the second reflector is used to reflect light of the first polarization state or light of the second polarization state reflected by the polarizing beam splitter.

[0016] In conjunction with the first aspect, in one possible implementation, the display device further includes a first reflector and a second reflector spaced apart, with the polarizing beam splitter disposed between the first reflector and the second reflector. The first reflector is used to reflect light of a first polarization state reflected by the second polarizing beam splitter, and the second reflector is used to reflect light of a second polarization state reflected by the first polarizing beam splitter.

[0017] In conjunction with the first aspect, in one possible implementation, the electrically tunable half-wave plate further includes a second electrically tunable half-wave plate, and the display device further includes a third polarizing beam splitter, a first semi-transparent mirror, and a first mirror group; the third polarizing beam splitter is used to reflect light of the second polarization state passing through the polarizing beam splitter to the first mirror group, the first mirror group is used to convert the light of the second polarization state into light of the first polarization state, the first mirror group is also used to direct the converted light of the first polarization state toward the third polarizing beam splitter, and the third polarizing beam splitter is also used to allow the light of the first polarization state to pass through; the second electrically tunable half-wave plate is used to switch between an off state and an on state according to a first timing period, the second electrically tunable half-wave plate is used to convert light of the first polarization state into light of the second polarization state when in the on state, or the second electrically tunable half-wave plate is used to convert light of the first polarization state into light of the second polarization state when in the on state. In the first state, the first electrically tunable half-wave plate is used to convert light of the second polarization state into light of the first polarization state. In the closed state, the second electrically tunable half-wave plate is used to allow light of the first polarization state or light of the second polarization state to pass through. When the first electrically tunable half-wave plate is in the closed state, the second electrically tunable half-wave plate is also in the closed state. When the first electrically tunable half-wave plate is in the open state, the second electrically tunable half-wave plate is also in the open state. The first semi-transparent and semi-reflective mirror is used to reflect the light of the first polarization state emitted from the second electrically tunable half-wave plate. The light of the first polarization state reflected by the first semi-transparent and semi-reflective mirror passes through the second electrically tunable half-wave plate, the third polarizing beam splitter, and the first mirror group in sequence. The first semi-transparent and semi-reflective mirror is also used to allow the light of the second polarization state that generates the real scene image to pass through. The third polarizing beam splitter is also used to reflect the light of the second polarization state that generates the real scene image emitted from the second electrically tunable half-wave plate.

[0018] In this scheme, the third polarizing beam splitter, the first mirror group, the second electrically tunable half-wave plate, and the first semi-transparent and semi-reflective mirror constitute the first light transmission path. The light that generates the virtual image is transmitted in the first light transmission path. The third polarizing beam splitter can reflect the second polarized light to the first mirror group, and the first mirror group can convert the second polarized light into the first polarized light, and then make the converted first polarized light shine on the third polarizing beam splitter. This increases the number of times the light that generates the virtual image (the first polarized light or the second polarized light) is reflected in the first light transmission path, thereby reducing the thickness of the first light transmission path and further reducing the thickness of the display device.

[0019] In conjunction with the first aspect, in one possible implementation, the electrically tunable half-wave plate further includes a third electrically tunable half-wave plate, and the display device further includes a fourth polarizing beam splitter, a second semi-transparent mirror, and a second mirror group; the fourth polarizing beam splitter is used to reflect light of the second polarization state passing through the polarizing beam splitter to the second mirror group, the second mirror group is used to convert the light of the second polarization state into light of the first polarization state, the second mirror group is also used to direct the converted light of the first polarization state toward the fourth polarizing beam splitter, and the fourth polarizing beam splitter is also used to allow the light of the first polarization state to pass through; the timing period further includes a second timing period, the third electrically tunable half-wave plate is used to switch between an off state and an on state according to the second timing period, and the third electrically tunable half-wave plate is used to convert light of the first polarization state into light of the second polarization state when in the on state, or the third When the electrically tunable half-wave plate is in the open state, it is used to convert light of the second polarization state into light of the first polarization state; when the second electrically tunable half-wave plate is in the closed state, it is used to allow light of the first polarization state or light of the second polarization state to pass through; when the first electrically tunable half-wave plate is in the closed state, the third electrically tunable half-wave plate is in the open state; when the first electrically tunable half-wave plate is in the open state, the third electrically tunable half-wave plate is in the closed state; the second semi-transparent and semi-reflective mirror is used to reflect light of the first polarization state emitted from the third electrically tunable half-wave plate, and the light of the first polarization state reflected by the second semi-transparent and semi-reflective mirror passes sequentially through the third electrically tunable half-wave plate, the fourth polarizing beam splitter, and the second mirror group; the second semi-transparent and semi-reflective mirror is also used to allow light of the second polarization state that generates the real scene image to pass through, and the fourth polarizing beam splitter is also used to reflect the light of the second polarization state that generates the real scene image emitted from the third electrically tunable half-wave plate.

[0020] In this scheme, the fourth polarizing beam splitter, the second mirror group, the third electrically tunable half-wave plate, and the second semi-transparent and semi-reflective mirror constitute the second light transmission path. The light that generates the virtual image is transmitted in the second light transmission path. The fourth polarizing beam splitter can reflect the light of the second polarization state to the second mirror group, and the second mirror group can convert the light of the second polarization state into the light of the first polarization state. The converted light of the first polarization state is then directed towards the fourth polarizing beam splitter, increasing the number of times the light (light of the first polarization state or light of the second polarization state) that generates the virtual image is reflected in the second light transmission path. This reduces the thickness of the second light transmission path and further reduces the thickness of the display device.

[0021] In conjunction with the first aspect, in one possible implementation, the third polarizing beam splitter and the second electrically tunable half-wave plate are stacked, the first mirror group is located on the side of the third polarizing beam splitter away from the second electrically tunable half-wave plate, and the first semi-transparent mirror is located on the side of the second electrically tunable half-wave plate away from the third polarizing beam splitter. The positioning of the third polarizing beam splitter, the second electrically tunable half-wave plate layer, the first mirror group, and the first semi-transparent mirror facilitates control over the transmission path of the light (light in the first polarization state or light in the second polarization state) that generates the virtual image within the first light transmission path, allowing the light generating the virtual image to undergo multiple reflections before finally entering the human eye.

[0022] In conjunction with the first aspect, in one possible implementation, the fourth polarizing beam splitter and the third electrically tunable half-wave plate are stacked, the second mirror group is located on the side of the fourth polarizing beam splitter away from the third electrically tunable half-wave plate, and the second semi-transparent mirror is located on the side of the third electrically tunable half-wave plate away from the fourth polarizing beam splitter. The positioning of the fourth polarizing beam splitter, the third electrically tunable half-wave plate layer, the second mirror group, and the second semi-transparent mirror facilitates control over the transmission path of the light (light in the first polarization state or light in the second polarization state) that generates the virtual image in the second light transmission path, allowing the light generating the virtual image to undergo multiple reflections before finally entering the human eye.

[0023] In conjunction with the first aspect, in one possible implementation, the first mirror group includes a second quarter-wave plate, a first beam splitter, and a third quarter-wave plate stacked sequentially, with the second quarter-wave plate located between the first beam splitter and the third polarizing beam splitter; the second quarter-wave plate is used to convert light of a second polarization state into light of a third polarization state; the first beam splitter is used to convert light of the third polarization state into light of a fourth polarization state and reflect the converted light of the fourth polarization state; the second quarter-wave plate is also used to convert light of the fourth polarization state into light of a first polarization state; the second quarter-wave plate is also used to convert light of the first polarization state into light of the fourth polarization state; the first beam splitter is used to allow incoming light of the fourth polarization state to pass through; and the third quarter-wave plate is used to convert light of the fourth polarization state into light of the first polarization state. The positions of the second quarter-wave plate, the first beam splitter, and the third quarter-wave plate are arranged such that the first mirror group can convert the second polarized light reflected from the third polarizing beam splitter into the first polarized light, and the first mirror group can direct the converted first polarized light toward the third polarizing beam splitter. The first mirror group can also allow the first polarized light from the third polarizing beam splitter to pass through, which is beneficial for controlling the transmission path of the light (first polarized light or second polarized light) that generates the virtual image in the first light transmission path, so that the light that generates the virtual image is reflected multiple times before finally entering the human eye.

[0024] In conjunction with the first aspect, in one possible implementation, the second mirror group includes a fourth quarter-wave plate, a second beam splitter, and a fifth quarter-wave plate stacked sequentially, with the fourth quarter-wave plate located between the second beam splitter and the fourth polarization beam splitter; the fourth quarter-wave plate is used to convert light of a second polarization state into light of a third polarization state; the second beam splitter is used to convert light of a third polarization state into light of a fourth polarization state and reflect the converted light of a fourth polarization state; the fourth quarter-wave plate is also used to convert light of a fourth polarization state into light of a first polarization state; the fourth quarter-wave plate is also used to convert light of a first polarization state into light of a fourth polarization state; the second beam splitter is used to allow light of a fourth polarization state to pass through; and the fifth quarter-wave plate is used to convert light of a fourth polarization state into light of a first polarization state. The positioning of the fourth quarter-wave plate, the second beam splitter, and the fifth quarter-wave plate allows the second mirror group to convert the second polarized light reflected from the fourth polarizing beam splitter into the first polarized light. The second mirror group also allows the converted first polarized light to be directed towards the fourth polarizing beam splitter, and allows the first polarized light from the fourth polarizing beam splitter to pass through. This facilitates control over the transmission path of the light (either the first or second polarized light) that generates the virtual image in the second light transmission path, ensuring that the light generating the virtual image undergoes multiple reflections before finally entering the human eye.

[0025] In conjunction with the first aspect, in one possible implementation, the electrically tunable half-wave plate further includes a second electrically tunable half-wave plate, and the display device further includes a third polarizing beam splitter, a first semi-transparent mirror, and a first mirror group; the third polarizing beam splitter is used to reflect light of a first polarization state passing through the polarizing beam splitter to the first mirror group, the first mirror group is used to convert light of the first polarization state into light of a second polarization state, the first mirror group is also used to direct the converted light of the second polarization state toward the third polarizing beam splitter, and the third polarizing beam splitter is also used to allow light of the second polarization state to pass through; the timing period further includes a second timing period, the second electrically tunable half-wave plate is used to switch between an off state and an on state according to the second timing period, and the second electrically tunable half-wave plate is used to convert light of the first polarization state into light of the second polarization state when in the on state, or the second... When the electrically tunable half-wave plate is in the open state, it is used to convert light of the second polarization state into light of the first polarization state. When the electrically tunable half-wave plate is in the closed state, it is used to allow light of the first polarization state or light of the second polarization state to pass through. When the first electrically tunable half-wave plate is in the closed state, the second electrically tunable half-wave plate is in the open state. When the first electrically tunable half-wave plate is in the open state, the second electrically tunable half-wave plate is in the closed state. The first semi-transparent and semi-reflective mirror is used to reflect light of the second polarization state emitted from the second electrically tunable half-wave plate. The light of the second polarization state reflected by the first semi-transparent and semi-reflective mirror passes through the second electrically tunable half-wave plate, the third polarizing beam splitter, and the first mirror group in sequence. The first semi-transparent and semi-reflective mirror is also used to allow light of the first polarization state that generates the real scene image to pass through. The third polarizing beam splitter is also used to reflect the light of the first polarization state that generates the real scene image emitted from the first semi-transparent and semi-reflective mirror.

[0026] In this scheme, the third polarizing beam splitter, the first mirror group, the second electrically tunable half-wave plate, and the first semi-transparent and semi-reflective mirror constitute the first light transmission path. The light that generates the virtual image is transmitted in the first light transmission path. The third polarizing beam splitter can reflect the light of the first polarization state to the first mirror group, and the first mirror group can convert the light of the first polarization state into light of the second polarization state. The converted light of the second polarization state is then directed towards the third polarizing beam splitter, increasing the number of times the light (light of the first polarization state or light of the second polarization state) that generates the virtual image is reflected in the first light transmission path. This reduces the thickness of the first light transmission path and further reduces the thickness of the display device.

[0027] In conjunction with the first aspect, in one possible implementation, the electrically tunable half-wave plate further includes a third electrically tunable half-wave plate, and the display device further includes a fourth polarizing beam splitter, a second semi-transparent mirror, and a second mirror group; the fourth polarizing beam splitter is used to reflect light of the first polarization state passing through the polarizing beam splitter to the second mirror group, the second mirror group is used to convert the light of the first polarization state into light of the second polarization state, and to direct the converted light of the second polarization state toward the fourth polarizing beam splitter, the fourth polarizing beam splitter is also used to allow light of the second polarization state to pass through; the third electrically tunable half-wave plate is used to switch between an off state and an on state according to a first timing period, the third electrically tunable half-wave plate is used to convert light of the first polarization state into light of the second polarization state when in the on state, or the third electrically tunable half-wave plate is used to... The second electrically tunable half-wave plate converts light of the second polarization state into light of the first polarization state. When the second electrically tunable half-wave plate is in the closed state, it allows light of either the first or second polarization state to pass through. When the first electrically tunable half-wave plate is in the closed state, the third electrically tunable half-wave plate is in the closed state. When the first electrically tunable half-wave plate is in the open state, the third electrically tunable half-wave plate is in the open state. The second semi-transparent and semi-reflective mirror reflects light of the second polarization state emitted from the third electrically tunable half-wave plate. The light of the second polarization state reflected by the second semi-transparent and semi-reflective mirror passes sequentially through the third electrically tunable half-wave plate, the fourth polarizing beam splitter, and the second mirror group. The second semi-transparent and semi-reflective mirror also allows light of the first polarization state that generates the real-world image to pass through. The fourth polarizing beam splitter also reflects light of the first polarization state that generates the real-world image emitted from the third electrically tunable half-wave plate.

[0028] In this scheme, the fourth polarizing beam splitter, the second mirror group, the third electrically tunable half-wave plate, and the second semi-transparent and semi-reflective mirror constitute the second light transmission path. The light that generates the virtual image is transmitted in the second light transmission path. The fourth polarizing beam splitter can reflect the light of the first polarization state to the second mirror group, and the second mirror group can convert the light of the first polarization state into the light of the second polarization state, and then make the converted light of the second polarization state shine on the fourth polarizing beam splitter. This increases the number of times the light that generates the virtual image (light of the first polarization state or light of the second polarization state) is reflected in the second light transmission path, thereby reducing the thickness of the second light transmission path and further reducing the thickness of the display device.

[0029] In conjunction with the first aspect, in one possible implementation, the screen includes a first screen, and the polarizer includes a first polarizer; the first screen and the first polarizer are stacked; the first polarizer is used to convert light from the first screen into light of a second polarization state; the electrically tunable half-wave plate includes a fourth electrically tunable half-wave plate; the display device further includes a fifth polarizing beam splitter, a third semi-transparent mirror, and a third mirror group; the fifth polarizing beam splitter is used to reflect light of the second polarization state emitted from the first polarizer to the third mirror group, the third mirror group is used to convert light of the second polarization state emitted from the fifth polarizing beam splitter into light of the first polarization state, the third mirror group is also used to reflect the converted light of the first polarization state back to the fifth polarizing beam splitter, and the fifth polarizing beam splitter is also used to allow light of the first polarization state to pass through; the time The sequence period includes a third timing period. The fourth electrically adjustable half-wave plate is used to switch between a closed state and an open state according to the third timing period. When the fourth electrically adjustable half-wave plate is in the open state, it is used to switch between light of the first polarization state and light of the second polarization state. When the fourth electrically adjustable half-wave plate is in the closed state, it is used to allow light of the first polarization state or light of the second polarization state to pass through. The third semi-transparent and semi-reflective mirror is used to reflect the light of the first polarization state emitted from the fourth electrically adjustable half-wave plate. The light of the first polarization state reflected by the third semi-transparent and semi-reflective mirror passes through the fourth electrically adjustable half-wave plate, the fifth polarizing beam splitter, and the third mirror group in sequence. The third semi-transparent and semi-reflective mirror is used to allow the light of the second polarization state that generates the real scene to pass through. The fifth polarizing beam splitter is also used to reflect the light of the second polarization state that generates the real scene emitted from the fourth electrically adjustable half-wave plate.

[0030] In this scheme, the fifth polarizing beam splitter, the third mirror group, the fourth electrically tunable half-wave plate, and the third semi-transparent and semi-reflective mirror can form the first light transmission path. The light that generates the virtual image is transmitted in the first light transmission path. The fifth polarizing beam splitter can reflect the second polarized light to the third mirror group, and the third mirror group can convert the second polarized light into the first polarized light. The converted first polarized light is then directed towards the fifth polarizing beam splitter, increasing the number of times the light (either the first or second polarized light) that generates the virtual image is reflected in the first light transmission path. This reduces the thickness of the first light transmission path and further reduces the thickness of the display device.

[0031] In conjunction with the first aspect, in one possible implementation, the fifth polarizing beam splitter and the fourth electrically tunable half-wave plate are stacked, and the third semi-transparent and semi-reflective mirror is disposed on the side of the fourth electrically tunable half-wave plate away from the fifth polarizing beam splitter; the third mirror group is disposed on the side of the fifth polarizing beam splitter away from the fourth electrically tunable half-wave plate. The positioning of the fifth polarizing beam splitter, the fourth electrically tunable half-wave plate layer, the third mirror group, and the third semi-transparent and semi-reflective mirror facilitates control over the transmission path of the light (light in the first polarization state or light in the second polarization state) that generates the virtual image in the first light transmission path, allowing the light generating the virtual image to undergo multiple reflections before finally entering the human eye.

[0032] In conjunction with the first aspect, in one possible implementation, the screen further includes a second screen, the polarizer further includes a second polarizer, and the second screen and the second polarizer are stacked; the electrically tunable half-wave plate further includes a fifth electrically tunable half-wave plate, and the display device further includes a sixth polarizing beam splitter, a fourth semi-transparent mirror, and a fourth mirror group; the sixth polarizing beam splitter is used to reflect light of a second polarization state emitted from the second polarizer to the fourth mirror group, the fourth mirror group is used to convert the light of the second polarization state emitted from the sixth polarizing beam splitter into light of a first polarization state, the fourth mirror group is also used to reflect the converted light of the first polarization state back to the sixth polarizing beam splitter, and the sixth polarizing beam splitter is also used to allow the light of the first polarization state converted by the fourth mirror group to pass through; the timing period includes a fourth timing period, the fifth electrically tunable half-wave plate is used to switch between an off state and an on state according to the fourth timing period, and the fifth electrically tunable half-wave plate in When in the open state, the fifth electrically adjustable half-wave plate is used to convert light of the first polarization state to light of the second polarization state, or when in the open state, the fifth electrically adjustable half-wave plate is used to convert light of the second polarization state to light of the first polarization state; when in the closed state, the fifth electrically adjustable half-wave plate is used to allow light of the first polarization state or light of the second polarization state to pass through; when the fourth electrically adjustable half-wave plate is in the closed state, the fifth electrically adjustable half-wave plate is in the open state; when the fourth electrically adjustable half-wave plate is in the open state, the fifth electrically adjustable half-wave plate is in the closed state; the fourth semi-transparent and semi-reflective mirror is used to reflect light of the first polarization state emitted from the fifth electrically adjustable half-wave plate, and the light of the first polarization state reflected by the fourth semi-transparent and semi-reflective mirror passes sequentially through the fifth electrically adjustable half-wave plate, the sixth polarizing beam splitter, and the fourth mirror group; the fourth semi-transparent and semi-reflective mirror is used to allow light of the second polarization state that generates the real scene image to pass through, and the sixth polarizing beam splitter is used to reflect light of the second polarization state that generates the real scene image emitted from the fifth electrically adjustable half-wave plate.

[0033] In this scheme, the sixth polarizing beam splitter, the fourth mirror group, the fifth electrically tunable half-wave plate, and the fourth semi-transparent and semi-reflective mirror can form a second light transmission path. The light that generates the virtual image is transmitted in the second light transmission path. The sixth polarizing beam splitter can reflect the light of the second polarization state to the fourth mirror group, and the fourth mirror group can convert the light of the second polarization state into the light of the first polarization state. The converted light of the first polarization state is then directed towards the sixth polarizing beam splitter, increasing the number of times the light (light of the first polarization state or light of the second polarization state) that generates the virtual image is reflected in the second light transmission path. This reduces the thickness of the second light transmission path and further reduces the thickness of the display device.

[0034] In conjunction with the first aspect, in one possible implementation, the sixth polarizing beam splitter is stacked with the fifth electrically tunable half-wave plate; the fourth semi-transparent and semi-reflective mirror is disposed on the side of the fifth electrically tunable half-wave plate away from the sixth polarizing beam splitter; and the fourth mirror group is disposed on the side of the sixth polarizing beam splitter away from the fifth electrically tunable half-wave plate. The positioning of the sixth polarizing beam splitter, the fifth electrically tunable half-wave plate layer, the fourth mirror group, and the fourth semi-transparent and semi-reflective mirror facilitates control over the transmission path of the light (light in the first polarization state or light in the second polarization state) that generates the virtual image in the second light transmission path, allowing the light generating the virtual image to undergo multiple reflections before finally entering the human eye.

[0035] In conjunction with the first aspect, in one possible implementation, the third mirror group includes a sixth quarter-wave plate, a third beam splitter, and a seventh quarter-wave plate stacked sequentially, with the sixth quarter-wave plate located between the third beam splitter and the fifth polarizing beam splitter; the sixth quarter-wave plate is used to convert light of a second polarization state into light of a third polarization state; the third beam splitter is used to convert light of a third polarization state into light of a fourth polarization state, and the third beam splitter is also used to reflect the converted fourth polarization light back to the sixth quarter-wave plate; the sixth quarter-wave plate is also used to convert light of a fourth polarization state into light of a first polarization state; the sixth quarter-wave plate is also used to convert light of a first polarization state into light of a fourth polarization state; the third beam splitter is also used to allow light of a fourth polarization state to pass through; and the seventh quarter-wave plate is used to convert light of a fourth polarization state into light of a first polarization state. The positions of the sixth quarter-wave plate, the third beam splitter, and the seventh quarter-wave plate are arranged so that the third mirror group can convert the second polarized light reflected from the fifth polarizing beam splitter into the first polarized light. The third mirror group can also direct the converted first polarized light toward the fifth polarizing beam splitter, and the third mirror group can also allow the first polarized light from the fourth polarizing beam splitter to pass through. This is beneficial for controlling the transmission path of the light (first polarized light or second polarized light) that produces the virtual image in the first light transmission path, so that the light that produces the virtual image is reflected multiple times before finally entering the human eye.

[0036] In conjunction with the first aspect, in one possible implementation, the fourth mirror group includes an eighth quarter-wave plate, a fourth beam splitter, and a ninth quarter-wave plate stacked sequentially, with the eighth quarter-wave plate located between the fourth beam splitter and the fifth polarizing beam splitter; the eighth quarter-wave plate is used to convert light of a second polarization state into light of a third polarization state; the fourth beam splitter is used to convert light of a third polarization state into light of a fourth polarization state, and the fourth beam splitter is also used to reflect the converted fourth polarization light back to the eighth quarter-wave plate; the eighth quarter-wave plate is also used to convert light of a fourth polarization state into light of a first polarization state; the eighth quarter-wave plate is also used to convert light of a first polarization state into light of a fourth polarization state; the fourth beam splitter is also used to allow light of a fourth polarization state to pass through; and the ninth quarter-wave plate is used to convert light of a fourth polarization state into light of a first polarization state. The positioning of the eighth quarter-wave plate, the fourth beam splitter, and the ninth quarter-wave plate allows the fourth mirror group to convert the second polarized light reflected from the sixth polarization beam splitter into the first polarized light. The fourth mirror group also allows the converted first polarized light to be directed toward the sixth polarization beam splitter, and allows the first polarized light from the sixth polarization beam splitter to pass through. This facilitates control over the transmission path of the light (first polarized light or second polarized light) that generates the virtual image in the second light transmission path, allowing the light that generates the virtual image to be reflected multiple times before finally entering the human eye.

[0037] Secondly, this application provides eyeglasses, the eyeglasses including an eyeglass frame and a display device as described in the first aspect, the eyeglass frame being connected to the display device. Attached Figure Description

[0038] Figure 1 A schematic diagram of the structure of a display device provided in this application;

[0039] Figure 2 A schematic diagram of another display device provided in this application;

[0040] Figure 3 A schematic diagram of the structure of yet another display device provided in this application;

[0041] Figure 4 A schematic diagram of the structure of yet another display device provided in this application;

[0042] Figure 5 A schematic diagram of the structure of yet another display device provided in this application;

[0043] Figure 6 A schematic diagram of the structure of yet another display device provided in this application;

[0044] Figure 7 A schematic diagram of the structure of yet another display device provided in this application;

[0045] Figure 8 A schematic diagram of the structure of yet another display device provided in this application;

[0046] Figure 9 A schematic diagram of the structure of yet another display device provided in this application;

[0047] Figure 10 A schematic diagram of the structure of yet another display device provided in this application;

[0048] Figure 11 A schematic diagram of the structure of yet another display device provided in this application;

[0049] Figure 12 A schematic diagram of the structure of yet another display device provided in this application;

[0050] Figure 13 A schematic diagram of the structure of yet another display device provided in this application;

[0051] Figure 14 A schematic diagram of the structure of yet another display device provided in this application;

[0052] Figure 15 A schematic diagram of the structure of yet another display device provided in this application;

[0053] Figure 16 A schematic diagram of the structure of yet another display device provided in this application;

[0054] Figure 17 Timing diagram for illuminating pixels in the screen using the Global mode provided in this application;

[0055] Figure 18 Timing diagram for illuminating pixels using rolling mode on the screen provided in this application.

[0056] Explanation of reference numerals in the attached figures:

[0057] 1. Screen; 11. First screen; 12. Second screen;

[0058] 2. Polarizing filter; 21. First polarizing filter; 22. Second polarizing filter;

[0059] 3. Electrically adjustable half-wave plate; 31. First electrically adjustable half-wave plate; 32. Second electrically adjustable half-wave plate; 33. Third electrically adjustable half-wave plate; 34. Fourth electrically adjustable half-wave plate; 35. Fifth electrically adjustable half-wave plate;

[0060] 4. Polarizing beam splitter; 41. First polarizing beam splitter; 42. Second polarizing beam splitter; 51. First quarter-wave plate; 52. First optical mechanism; 53. Second optical mechanism; 54. First optical transmission path; 55. Second optical transmission path;

[0061] 61. First reflecting mirror; 62. Second reflecting mirror;

[0062] 71. Third polarizing beam splitter; 72. Fourth polarizing beam splitter; 73. Fifth polarizing beam splitter; 74. Sixth polarizing beam splitter;

[0063] 81. The first half-mirror; 82. The second half-mirror; 83. The third half-mirror; 84. The fourth half-mirror;

[0064] 91. First mirror group; 91a. Second quarter-wave plate; 91b. First beam splitter; 91c. Third quarter-wave plate;

[0065] 92. Second mirror group; 92a. Fourth quarter-wave plate; 92b. Second beam splitter; 92c. Fifth quarter-wave plate;

[0066] 93. Third mirror group; 93a. Sixth quarter-wave plate; 93b. Third beam splitter; 93c. Seventh quarter-wave plate;

[0067] 94. Fourth mirror group; 94a. Eighth quarter-wave plate; 94b. Fourth beam splitter; 94c. Ninth quarter-wave plate. Detailed Implementation

[0068] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0069] This application discloses a pair of eyeglasses, which includes an eyeglass frame and a display device, wherein the eyeglass frame is connected to the display device.

[0070] Please see Figure 1 The display device includes a screen 1, a polarizer 2 (POL), and an electrically tunable half-wave plate 3 (eHWP). The screen 1 generates an image, which is produced by the light emitted from the screen 1. Light reflected from the real scene also generates an image after entering the display device.

[0071] Screen 1 and polarizer 2 are stacked together. Polarizer 2 is used to convert the light emitted from screen 1 into light with a first polarization state or a second polarization state. Electrically tunable half-wave plate 3 is located on the side of polarizer 2 away from screen 1. Electrically tunable half-wave plate 3 has an off state and an on state. Electrically tunable half-wave plate 3 is used to switch between the off state and the on state according to a timing period.

[0072] When the electrically slew-wave plate 3 is in the on state, it is used to convert light rays of the first polarization state to light rays of the second polarization state, or vice versa. When the electrically slew-wave plate 3 is in the off state, it allows light rays of either the first or second polarization state to pass through. The first polarization state light ray can be P-ray (horizontally polarized light) or S-ray (vertically polarized light). The second polarization state light ray can also be P-ray (horizontally polarized light) or S-ray (vertically polarized light). The polarization directions of the first and second polarization states of light are different. For example, when the first polarization state light ray is P-ray, the second polarization state light ray can be S-ray; conversely, when the first polarization state light ray is S-ray, the second polarization state light ray can be P-ray. It should be noted that the first polarization state light ray is not limited to P-ray or S-ray, but can also be other polarization states. The second polarization state light ray is not limited to P-ray or S-ray, but can also be other polarization states. To facilitate the distinction between the first polarization state and the second polarization state of light when referring to the accompanying drawings, the following drawings will use P-light to represent the first polarization state of light and S-light to represent the second polarization state of light.

[0073] In XR display technology, the display device typically has two different light transmission paths, corresponding to the user's two eyes respectively. For ease of understanding, the two different light transmission paths are labeled as the first light transmission path 54 and the second light transmission path 55.

[0074] The electrically slewing half-wave plate 3 can switch between an off state and an on state according to a timing cycle. This allows the image produced by light of a first polarization state to switch between the image produced by light of a second polarization state according to the timing cycle. In the off state, the electrically slewing half-wave plate 3 allows light of the first polarization state to pass through; in the on state, it converts the light of the first polarization state to light of the second polarization state. The electrically slewing half-wave plate 3 can distinguish the polarization direction of the light producing different images according to the timing cycle, facilitating the splitting of the light along the light transmission path, thus allowing the user's eyes to see different images through the display device. These different images can be images with parallax, including real-scene images and virtual-scene images.

[0075] For example, the electrically tunable half-wave plate 3 switches between a closed state and an open state according to a timing cycle. In the first stage of the timing cycle, if the light of the first polarization state that generates the first image is directed toward the electrically tunable half-wave plate 3, and the electrically tunable half-wave plate 3 is in the closed state, the light of the first polarization state directed toward the electrically tunable half-wave plate 3 will pass through the electrically tunable half-wave plate 3. The light of the first polarization state can enter one of the user's eyes through the first light transmission path 54, and the display device can present the first image through the first light transmission path 54.

[0076] In the second stage of the timing cycle, if the light of the first polarization state that generates the second image is directed toward the electrically tunable half-wave plate 3, and the electrically tunable half-wave plate 3 is in the on state, the electrically tunable half-wave plate 3 will convert the light of the first polarization state that generates the second image into light of the second polarization state. The light of the second polarization state can enter the user's other eye through the second light transmission path 55, and the display device can present the second image through the second light transmission path 55.

[0077] Both the first and second images can be generated by screen 1. The first and second images are images with parallax. The display device presents the first and second images to the user's eyes respectively to realize the 3D effect. The first image can be generated by the light emitted from screen 1, and the second image can be generated by the light reflected from the real scene. The display device presents the first and second images to the user's eyes respectively to achieve the superposition of virtual and real scenes.

[0078] Example 1

[0079] Please see Figure 2 and Figure 3 The display device also includes a polarizing beam splitter 4, and an electrically tunable half-wave plate 3, including a first electrically tunable half-wave plate 31. The first electrically tunable half-wave plate 31 and the polarizer 2 are stacked together, with the first electrically tunable half-wave plate 31 located on the side of the polarizer 2 away from the screen 1, and the polarizing beam splitter 4 located on the side of the first electrically tunable half-wave plate 31 away from the polarizer 2. Specifically, the screen 1, the polarizer 2, the first electrically tunable half-wave plate 31, and the polarizing beam splitter 4 are stacked sequentially.

[0080] The timing cycle includes a first timing cycle, and screen 1 generates a first virtual scene and a second virtual scene according to the first timing cycle.

[0081] Specifically, screen 1 alternately generates the first virtual scene and the second virtual scene according to the first time sequence cycle. It can be understood that within one first time sequence cycle, screen 1 can generate the first virtual scene and the second virtual scene sequentially, or screen 1 can generate the second virtual scene and the first virtual scene sequentially.

[0082] Polarizer 2 is used to convert the light used by screen 1 to generate a first or second virtual image into light with a first polarization state. When screen 1 generates a first virtual image, the light used to generate the first virtual image passes through polarizer 2, which converts the light used to generate the first virtual image into light with the first polarization state. When screen 1 generates a second virtual image, the light used to generate the second virtual image passes through polarizer 2, which converts the light used to generate the second virtual image into light with the first polarization state.

[0083] The first electrically tunable half-wave plate 31 has a closed state and an open state, and is used to switch between the closed state and the open state according to a first timing period. When the first electrically tunable half-wave plate 31 is in the closed state, it is used to allow light of a first polarization state to pass through in order to generate the first virtual image. When the first electrically tunable half-wave plate 31 is in the open state, it is used to convert light of a first polarization state in order to generate light of a second polarization state.

[0084] The first electrically tunable half-wave plate 31 switches between an off state and an on state according to a first timing cycle, and the screen 1 generates a first virtual scene and a second virtual scene according to the first timing cycle. When the screen 1 generates the first virtual scene, the first electrically tunable half-wave plate 31 is in the off state, allowing light of the first polarization state to pass through it. When the screen 1 generates the second virtual scene, the first electrically tunable half-wave plate 31 is in the on state, converting the light of the first polarization state to light of the second polarization state. In this way, the light of the first polarization state emitted from the first electrically tunable half-wave plate 31 can generate the first virtual scene, and the light of the second polarization state emitted from the second electrically tunable half-wave plate 32 can generate the second virtual scene.

[0085] In the embodiments provided in this application, screen 1 alternately generates a first virtual scene and a second virtual scene according to a first timing cycle, and the first electrically tunable half-wave plate 31 switches between an off state and an on state according to the first timing cycle. The switching of the off state and the on state of the first electrically tunable half-wave plate 31 is synchronized with the alternating generation of the first virtual scene and the second virtual scene by screen 1. While the first electrically tunable half-wave plate 31 switches between the off state and the on state, the first virtual scene and the second virtual scene generated by screen 1 switch synchronously. When the first electrically tunable half-wave plate 31 switches from the off state to the on state, screen 1 switches from generating the first virtual scene to generating the second virtual scene. Alternatively, when the first electrically tunable half-wave plate 31 switches from the on state to the off state, screen 1 switches from generating the first virtual scene to generating the second virtual scene. In the first embodiment, when the first electrically tunable half-wave plate 31 is in the off state, screen 1 generates the first virtual scene, and when the first electrically tunable half-wave plate 31 is in the on state, screen 1 generates the second virtual scene. In the second embodiment, when the first electrically tunable half-wave plate 31 is in the on state, the screen 1 generates a first virtual image, and when the first electrically tunable half-wave plate 31 is in the off state, the screen 1 generates a second virtual image.

[0086] In the display device provided in this application, the polarizing beam splitter 4 is used to split the light of the first polarization state that generates the first virtual image and the light of the second polarization state that generates the second virtual image into different light transmission paths.

[0087] In this application, screen 1 generates a first virtual scene and a second virtual scene according to a first timing cycle. The first electrically tunable half-wave plate 31 switches between a closed state and an open state according to the first timing cycle. The polarizing beam splitter 4 splits the light of the first polarization state that generates the first virtual scene and the light of the second polarization state that generates the second virtual scene into different light transmission paths. The user's two eyes can see the first virtual scene and the second virtual scene respectively, so the display device can present a better 3D effect.

[0088] In the embodiments provided in this application, the polarizing beam splitter 4 includes a first polarizing beam splitter 41. The first polarizing beam splitter 41 is used to allow light of a first polarization state to pass through in order to generate a first virtual image, and the first polarizing beam splitter 41 is also used to reflect light of a second polarization state in order to generate a second virtual image; or, the first polarizing beam splitter 41 is used to reflect light of the first polarization state in order to generate a first virtual image, and the first polarizing beam splitter 41 is also used to allow light of the second polarization state in order to pass through in order to generate a second virtual image. The first polarizing beam splitter 41 can be a reflective polarizer (RP).

[0089] The first polarizing beam splitter 41 allows one of the first polarized light and the second polarized light to pass through and reflects the other of the first polarized light and the second polarized light, thus splitting the first polarized light that generates the first virtual image and the second polarized light that generates the second virtual image into different light transmission paths. In this way, the display device can present the first virtual image and the second virtual image to the user's eyes respectively. For example, the display device presents the first virtual image to the user's left eye and the second virtual image to the user's right eye. Alternatively, the display device presents the second virtual image to the user's left eye and the first virtual image to the user's right eye.

[0090] In the first implementation of this embodiment, if the first electrically tunable half-wave plate 31 is in the off state, the light of the first polarized state that generates the first virtual image passes through the first electrically tunable half-wave plate 31 and is directed towards the polarizing beam splitter 41. The first polarizing beam splitter 41 allows the light of the first polarized state that generates the first virtual image to pass through. After the first electrically tunable half-wave plate 31 switches from the off state to the on state, it converts the light of the first polarized state that generates the second virtual image into light of the second polarized state. The first electrically tunable half-wave plate 31 directs the converted light of the second polarized state towards the polarizing beam splitter 41, and the first polarizing beam splitter 41 reflects the light of the second polarized state that generates the second virtual image.

[0091] In the second embodiment of this invention, if the first electrically tunable half-wave plate 31 is in the on state, it converts the light of the first polarized state that generates the first virtual image into light of the second polarized state. The first electrically tunable half-wave plate 31 then directs the converted light of the second polarized state toward the polarizing beam splitter 41, through which the second polarized light passes. After the first electrically tunable half-wave plate 31 switches from the on state to the off state, the light of the first polarized state that generates the second virtual image passes through the first electrically tunable half-wave plate 31 and is directed toward the first polarizing beam splitter 41. The first polarizing beam splitter 41 reflects the light of the first polarized state that generates the second virtual image.

[0092] The display device also includes a first quarter-wave plate 51 (QWP), which is disposed on the side of the polarizing beam splitter 4 away from the first electrically tunable half-wave plate 31.

[0093] The first quarter-wave plate 51 is used to convert light rays of the first polarization state that have passed through the first polarization beam splitter 41 into light rays of the second polarization state; or, the first quarter-wave plate 51 is used to convert light rays of the second polarization state that have passed through the first polarization beam splitter 41 into light rays of the first polarization state.

[0094] In the embodiments provided in this application, if the first polarizing beam splitter 41 allows light of a first polarized state to pass through in order to generate the first virtual image, and the first polarizing beam splitter 41 reflects light of a second polarized state to generate the second virtual image, the first quarter-wave plate 51 converts the light of the first polarized state passing through the first polarizing beam splitter 41 into light of the second polarized state. It should be noted that in this case, the first quarter-wave plate 51 can reflect the light of the second polarized state that generates the first virtual image, and the first polarizing beam splitter 41 reflects the light of the second polarized state that generates the second virtual image.

[0095] If the first polarizing beam splitter 41 allows light of the second polarization state to pass through, and the first polarizing beam splitter reflects light of the first polarization state to produce the first virtual image, the first quarter-wave plate 51 will convert the light of the second polarization state passing through the first polarizing beam splitter 41 into light of the first polarization state. It should be noted that the first quarter-wave plate 51 can reflect the light of the second polarization state to produce the second virtual image, while the first polarizing beam splitter 41 reflects the light of the first polarization state to produce the first virtual image.

[0096] In the embodiments provided in this application, the first quarter-wave plate 51 and the first polarizing beam splitter 41 are at an angle. The first polarizing beam splitter 41 is used to reflect the light of the second polarization state obtained by the first quarter-wave plate 51, or the first polarizing beam splitter 41 is also used to reflect the light of the first polarization state obtained by the first quarter-wave plate 51.

[0097] Since there is an angle between the first quarter-wave plate 51 and the first polarizing beam splitter 41, it can be concluded that the first quarter-wave plate 51 and the first polarizing beam splitter 41 are not parallel. After the light of the first polarization state or the light of the second polarization state passes through the first polarizer 21, the first quarter-wave plate 51 changes the polarization direction of the light of the first polarization state or the light of the second polarization state. For example, the first quarter-wave plate 51 converts the light of the first polarization state into the light of the second polarization state, or the first quarter-wave plate 51 converts the light of the second polarization state into the light of the first polarization state.

[0098] If the first quarter-wave plate 51 converts the light rays of the first polarization state passing through the first polarizing beam splitter 41 into light rays of the second polarization state, the first quarter-wave plate 51 reflects the converted second polarization light rays back to the first polarizing beam splitter 41, and the first polarizing beam splitter 41 then reflects the light rays converted to the second polarization state by the first quarter-wave plate 51. It should be noted that in this case, the first polarizing plate 21 allows the light rays of the first polarization state to pass through, and the first polarizing plate 21 reflects the light rays of the second polarization state. The propagation directions of the light rays converted to the second polarization state by the first quarter-wave plate 51 and the light rays of the second polarization state from the first polarizing plate 21 reflected by the first polarizing beam splitter 41 are different. The light rays converted to the second polarization state by the first quarter-wave plate 51 reflected by the first polarizing beam splitter 41 are directed to the left, while the second polarization light rays from the first polarizing plate 21 are directed to the right.

[0099] If the first quarter-wave plate 51 converts the light rays in the second polarization state from the first polarizing beam splitter 41 into light rays in the first polarization state, the first quarter-wave plate 51 reflects the converted first polarization state light rays back to the first polarizing beam splitter 41, and the first polarizing beam splitter 41 then reflects the light rays converted into the first polarization state by the first quarter-wave plate 51. It should be noted that in this case, the first polarizer 21 allows the second polarization state light rays to pass through, and the first polarizer 21 reflects the first polarization state light rays. The propagation directions of the light rays converted into the first polarization state by the first quarter-wave plate 51 and the first polarization state light rays emitted from the first electrically tunable half-wave plate 31 reflected by the first polarizing beam splitter 41 are different. The first polarizing beam splitter 41 directs the light rays converted into the first polarization state by the first quarter-wave plate 51 to the left, and directs the first polarization state light rays emitted from the first electrically tunable half-wave plate 31 to the right.

[0100] The display device also includes a first reflector 61 and a second reflector 62 spaced apart, and a polarizing beam splitter 4 is disposed between the first reflector 61 and the second reflector 62. The first reflector 61 is used to reflect light of the first polarization state or the second polarization state obtained by the first quarter-wave plate 51; the second reflector 62 is used to reflect light of the first polarization state or the second polarization state reflected by the polarizing beam splitter 4.

[0101] In the embodiments provided in this application, the display device may further include a first relay lens group and a second relay lens group. The first relay lens group may be disposed between the first reflecting mirror 61 and the polarizing beam splitter 4, and the second relay lens group may be disposed between the second reflecting mirror 62 and the polarizing beam splitter 4. The first relay lens group is beneficial for imaging of light (light with a first polarization state or light with a second polarization state).

[0102] In some implementations, the display device further includes a first optical engine 52 and a second optical engine 53, which are spaced apart. The polarizing beam splitter 4 can split the light (light in a first polarization state or light in a second polarization state) that generates the first virtual image and the light (light in a first polarization state or light in a second polarization state) that generates the second virtual image to the first optical engine 52 and the second optical engine 53. The first optical engine 52 and the second optical engine 53 are beneficial for light imaging.

[0103] In some implementations, please refer to Figure 4 and Figure 5 The first optical mechanism 52 can be a pancake lens assembly, and the second optical mechanism 53 can be a pancake lens assembly. Figure 4 In the process, the light of the first polarized state that produces the first virtual image enters the first optical engine 52. Figure 5 The light of the second polarized state that produces the second virtual image enters the second optical engine 53.

[0104] In some implementations, the first optomechanism can be a bird bath (BB) reflection imaging optical path, and the second optomechanism can be a bird bath reflection imaging optical path.

[0105] In this embodiment, the display device can be applied to Virtual Reality (VR), Augmented Reality (AR), or Mixed Reality (MR). The first virtual scene and the second virtual scene can be scenes with parallax. The polarizing beam splitter 4 will present the light from the first virtual scene (light in the first polarization state or light in the second polarization state) and the light from the second virtual scene (light in the first polarization state or light in the second polarization state) to the user's eyes respectively, providing the user with a three-dimensional dynamic simulation experience.

[0106] In the embodiments provided in this application, the first timing cycle used for time-division display on screen 1 can be either GLOBAL mode or Rolling mode. For example, screen 1 can be a liquid crystal on silicon (LCOS), and LCOS can use GLOBAL mode for time-division display. Screen 1 can be a Micro OLED, and MicroOLED can use GLOBAL mode or Rolling mode for time-division display; screen 1 can be a Micro LED, and MicroLED can use GLOBAL mode or Rolling mode for time-division display; screen 1 can be a Digital Micromirror Device (DMD), and DMD can use GLOBAL mode for time-division display.

[0107] In this application, when the screen displays in 1 minute time using GLOBAL mode, the first electrically tunable half-wave plate 31 also needs to use the same timing switching between on and off states as in GLOBAL mode. When the screen displays in 1 minute time using Rolling mode, the first electrically tunable half-wave plate 31 also needs to use the same timing switching between on and off states as in Rolling mode.

[0108] In this embodiment, the display device uses a screen 1 to emit light that generates a first virtual image and a second virtual image in a time-division manner. The screen 1 emits light that generates the first virtual image and the second virtual image according to a first timing cycle. The polarizer 2 converts the light that generates the first virtual image and the second virtual image into light with a first polarization state. The first electrically tunable half-wave plate switches between a closed state and an open state according to the first timing cycle, so that the light with the first polarization state entering the polarizing beam splitter 4 generates the first virtual image and the light with the second polarization state entering the polarizing beam splitter 4 generates the second virtual image. The polarizing beam splitter 4 allows the light that generates the first virtual image and the light that generates the second virtual image to enter the user's eyes respectively, so that the user can have a three-dimensional dynamic simulation experience. Since the display device only needs to use a screen 1, the cost of the display device can be reduced.

[0109] Example 2

[0110] The difference between this embodiment and Embodiment 1 is that please refer to [link / reference]. Figure 6 and Figure 7The polarizing beam splitter 4 can be a beam combining prism (XCube). The polarizing beam splitter 4 includes a first polarizing beam splitter 41 and a second polarizing beam splitter 42. The first polarizing beam splitter 41 and the second polarizing beam splitter 42 are connected and cross-arranged. The first polarizing beam splitter 41 has an angle with the first electrically tunable half-wave plate 31, and the second polarizing beam splitter 42 has an angle with the electrically tunable half-wave plate 31. The first polarizing beam splitter 41 is used to allow light of the first polarization state from the first virtual scene to pass through, and the second polarizing beam splitter 42 is used to reflect the light of the first polarization state from the first virtual scene.

[0111] The second polarizing beam splitter 42 is used to allow light of the second polarization state from the second virtual image to pass through, and the first polarizing beam splitter 41 is used to reflect light of the second polarization state from the second virtual image.

[0112] Please refer to the embodiments provided in this application. Figure 6 The first polarizing beam splitter 41 first allows the light of the first polarized state that generates the first virtual image to pass through, and the light of the first polarized state that passes through the first polarizing beam splitter 41 is then reflected by the second polarizing beam splitter 42. Alternatively, the second polarizing beam splitter 42 first reflects the light of the first polarized state that generates the first virtual image, and the first polarizing beam splitter 41 then allows the light of the first polarized state to pass through. For example, the polarizing beam splitter 4 directs the light of the first polarized state that generates the first virtual image toward the first optical mechanism 52.

[0113] Please see Figure 7 The second polarizing beam splitter 42 first allows the light of the second polarized state that generates the second virtual image to pass through, and the first polarizing beam splitter 41 then reflects the light of the second polarized state that has passed through the second polarizing beam splitter 42. Alternatively, the first polarizing beam splitter 41 first reflects the light of the second polarized state that generates the second virtual image, and the second polarizing beam splitter 42 then allows the light of the second polarized state reflected from the first polarizing beam splitter 41 to pass through. For example, the polarizing beam splitter 4 directs the light of the second polarized state that generates the second virtual image toward the second optical mechanism 53.

[0114] In this application, by connecting and cross-arranging the first polarizing beam splitter 41 and the second polarizing beam splitter 42, the first polarized light and the second polarized light emitted from the first electrically tunable half-wave plate 31 can be directed in different directions, thereby allowing the first virtual image and the second virtual image to be presented to the user's eyes respectively.

[0115] The display device also includes a first reflector 61 and a second reflector 62 spaced apart, and a polarizing beam splitter 4 is disposed between the first reflector 61 and the second reflector 62. The first reflector 61 is used to reflect light of the first polarization state reflected by the second polarizing beam splitter 42; the second reflector 62 is used to reflect light of the second polarization state reflected by the first polarizing beam splitter 41.

[0116] Example 3

[0117] The difference between this embodiment and Embodiment 1 is that please refer to [link / reference]. Figure 8 and Figure 9 The first optical engine 52 is replaced by a component consisting of a second electrically tunable half-wave plate 32, a third polarizing beam splitter 71, a first semi-transparent and semi-reflective mirror 81, and a first mirror group 91. The display device provided in this embodiment can be applied to Augmented Reality (AR) or Mixed Reality (MR). The first and second virtual scenes can be scenes without parallax, or scenes with parallax. Since this embodiment focuses on explaining how the display device presents real and virtual scenes to give users an immersive experience, for ease of description and understanding, both the first and second virtual scenes are referred to as virtual scenes.

[0118] The third polarizing beam splitter 71 is used to reflect the light of the second polarization state passing through the polarizing beam splitter 4 to the first mirror group 91. The first mirror group 91 is used to convert the light of the second polarization state into light of the first polarization state. The light of the first polarization state obtained by the first mirror group 91 is directed towards the third polarizing beam splitter 71. The third polarizing beam splitter 71 is also used to allow the light of the first polarization state to pass through.

[0119] The second electrically tunable half-wave plate 32 is used to switch between a closed state and an open state according to a first timing period. When the second electrically tunable half-wave plate 32 is in the open state, it is used to convert light of the first polarization state to light of the second polarization state, or to convert light of the second polarization state to light of the first polarization state. When the second electrically tunable half-wave plate 32 is in the closed state, it is used to allow light of the first polarization state or light of the second polarization state to pass through. When the first electrically tunable half-wave plate 31 is in the closed state, the second electrically tunable half-wave plate 32 is in the closed state. When the first electrically tunable half-wave plate 31 is in the open state, the second electrically tunable half-wave plate 32 is in the open state.

[0120] The first semi-transparent and semi-reflective mirror 81 is used to reflect the first polarized light emitted from the second electrically tunable half-wave plate 32. The first polarized light reflected by the first semi-transparent and semi-reflective mirror 81 passes sequentially through the second electrically tunable half-wave plate 32, the third polarizing beam splitter 71, and the first mirror group 91. The first semi-transparent and semi-reflective mirror 81 is also used to allow the second polarized light that generates the real scene to pass through. The third polarizing beam splitter 71 is also used to reflect the first polarized light emitted from the first semi-transparent and semi-reflective mirror 81 that generates the real scene.

[0121] The third polarizing beam splitter 71 and the second electrically tunable half-wave plate 32 are stacked together. The first mirror group 91 is located on the side of the third polarizing beam splitter 71 away from the second electrically tunable half-wave plate 32. The first semi-transparent and semi-reflective mirror 81 is located on the side of the second electrically tunable half-wave plate 32 away from the third polarizing beam splitter 71.

[0122] Please see Figure 8 If the first electrically tunable half-wave plate 31 is in the off state, the light of the first polarized state that generates the virtual image passes through the first electrically tunable half-wave plate 31. The light of the first polarized state passes through the first polarizing beam splitter 41 in the polarizing beam splitter 4 and is incident on the first quarter-wave plate 51. The first quarter-wave plate 51 converts the light of the first polarized state incident on the first polarizing beam splitter 41 into light of the second polarized state. The first quarter-wave plate 51 causes the converted second polarized light to be incident on the first reflecting mirror 61. The first reflecting mirror 61 reflects the second polarized light that generates the virtual image to the third polarizing beam splitter 71. The third polarizing beam splitter 71 reflects the second polarized light that generates the virtual image to the first mirror group 91. The first mirror group 91 converts the second polarized light into light of the first polarized state that is incident on the third polarizing beam splitter 71. The first polarized light that generates the virtual image passes through the third polarizing beam splitter 71 and is incident on the second electrically tunable half-wave plate 32. The second electrically tunable half-wave plate 32 is also in the off state. The light of the first polarized state that generates the virtual image passes through the second electrically tunable half-wave plate 32 in the off state and is directed towards the first semi-transparent and semi-reflective mirror 81. The first semi-transparent and semi-reflective mirror 81 reflects the light of the first polarized state that generates the virtual image, so that the light of the first polarized state passes through the second electrically tunable half-wave plate 32 in the off state, the third polarizing beam splitter 71 and the first mirror group 91 in sequence, and finally the light of the first polarized state that generates the virtual image reaches the user's first eye. In this scenario, the real-world image is projected from the side of the first semi-transparent mirror 81 that faces away from the second electrically tunable half-wave plate 32. The first semi-transparent mirror 81 allows the second polarized light that generates the real-world image to pass through. The second polarized light that generates the real-world image passes through the first semi-transparent mirror 81 and then passes through the second electrically tunable half-wave plate 32, which is in a closed state, and is projected onto the third polarizing beam splitter 71. The third polarizing beam splitter 71 reflects the second polarized light that generates the real-world image. The second polarized light that generates the real-world image, reflected by the third polarizing beam splitter 71, passes sequentially through the second electrically tunable half-wave plate 32 and the first semi-transparent mirror 81. At this time, the real-world image does not enter the user's first eye; the user's first eye can only see the virtual image.

[0123] When the first electrically tunable half-wave plate 31 switches from the off state to the on state, and the second electrically tunable half-wave plate 3 switches from the off state to the on state, the second polarized light emitted from the first electrically tunable half-wave plate 31, which generates the virtual image, is directly reflected by the first polarizing beam splitter 41 to the second reflecting mirror 62. At this time, the second polarized light that generates the virtual image no longer shines on the third polarizing beam splitter 71. At this time, the second polarized light that generates the real image passes through the first semi-transparent and semi-reflective mirror 81 and shines on the second electrically tunable half-wave plate 32, which is in the on state. The second electrically tunable half-wave plate 32 converts the second polarized light that generates the real image into the first polarized light. The first polarized light that generates the real image passes through the third polarizing beam splitter 71 and the first mirror group 91 in sequence and shines on the user's first eye. At this time, the user's first eye can see the real image.

[0124] Understandably, when the first electrically tunable half-wave plate 31 switches from the off state to the on state, and the second electrically tunable half-wave plate 32 switches from the off state to the on state, the display device can switch the virtual scene presented to the user's first eye to the real scene. The display device combines the virtual scene and the real scene, so that the virtual scene and the real scene environment are integrated into one, enhancing the user's immersive experience.

[0125] In the embodiments provided in this application, the first mirror group 91 includes a second quarter-wave plate 91a, a first beam splitter 91b and a third quarter-wave plate 91c stacked in sequence, with the second quarter-wave plate 91a located between the first beam splitter 91b and the third polarizing beam splitter 91c.

[0126] The second quarter-wave plate 91a is used to convert light rays of the second polarization state into light rays of the third polarization state; the light rays of the third polarization state are left-handed circularly polarized light (LCP). The first beam splitter 91b is used to convert light rays of the third polarization state into light rays of the fourth polarization state and reflect the converted light rays of the fourth polarization state; the light rays of the fourth polarization state are right-handed circularly polarized light (RCP). The second quarter-wave plate 91a is also used to convert light rays of the fourth polarization state into light rays of the first polarization state; the second quarter-wave plate 91a is also used to convert light rays of the first polarization state into light rays of the fourth polarization state; the first beam splitter 91b is used to allow light rays of the fourth polarization state to pass through; the third quarter-wave plate 91c is used to convert light rays of the fourth polarization state into light rays of the first polarization state.

[0127] In this application, the electrically tunable half-wave plate 3 further includes a third electrically tunable half-wave plate 33, and the display device further includes a fourth polarizing beam splitter 72, a second semi-transparent and semi-reflective mirror 82, and a second mirror group 92. The assembly consisting of the fourth polarizing beam splitter 72, the third electrically tunable half-wave plate 33, the second semi-transparent and semi-reflective mirror 82, and the second mirror group 92 replaces the second optomechanical unit 53.

[0128] The fourth polarizing beam splitter 72 is used to reflect the light of the second polarization state passing through the polarizing beam splitter 4 to the second mirror group 92. The second mirror group 92 is used to convert the light of the second polarization state into light of the first polarization state and to direct the converted light of the first polarization state toward the fourth polarizing beam splitter 72. The fourth polarizing beam splitter 72 is also used to allow the light of the first polarization state to pass through.

[0129] The third electrically tunable half-wave plate 33 is used to switch between a closed state and an open state according to the second timing period. When the third electrically tunable half-wave plate 33 is in the open state, it is used to convert light of the first polarization state to light of the second polarization state, or to convert light of the second polarization state to light of the first polarization state. When the second electrically tunable half-wave plate 32 is in the closed state, it is used to allow light of the first polarization state or light of the second polarization state to pass through. When the first electrically tunable half-wave plate 31 is in the closed state, the third electrically tunable half-wave plate 33 is in the open state. When the first electrically tunable half-wave plate 31 is in the open state, the third electrically tunable half-wave plate 33 is in the closed state.

[0130] The second semi-transparent and semi-reflective mirror 82 is used to reflect the first polarized light emitted from the third electrically tunable half-wave plate 33. The first polarized light reflected by the second semi-transparent and semi-reflective mirror 82 passes sequentially through the third electrically tunable half-wave plate 33, the fourth polarizing beam splitter 72, and the second mirror group 92. The second semi-transparent and semi-reflective mirror 82 is also used to allow the second polarized light that generates the real scene to pass through. The fourth polarizing beam splitter is also used to reflect the second polarized light that generates the real scene emitted from the third electrically tunable half-wave plate 33.

[0131] The fourth polarizing beam splitter 72 and the third electrically tunable half-wave plate 33 are stacked together. The second mirror group 92 is located on the side of the fourth polarizing beam splitter 72 away from the third electrically tunable half-wave plate 33. The second semi-transparent and semi-reflective mirror 82 is located on the side of the third electrically tunable half-wave plate 33 away from the fourth polarizing beam splitter 72.

[0132] Please participate Figure 9The first electrically tunable half-wave plate 31 is in the open state. The first electrically tunable half-wave plate 31 converts the light of the first polarization state that produces the virtual image into light of the second polarization state. The light of the second polarization state is reflected by the first polarizing beam splitter 41 to the second reflecting mirror 62. The light of the second polarization state that produces the virtual image is reflected by the second reflecting mirror 62 to the fourth polarizing beam splitter 72. The fourth polarizing beam splitter 72 reflects the light of the second polarization state that produces the virtual image to the second mirror group 92. The second mirror group 92 reflects the light of the second polarization state that produces the virtual image and converts the light of the second polarization state into light of the first polarization state that is directed towards the fourth polarizing beam splitter 72. When the third electrically tunable half-wave plate 33 is in the off state, the light of the first polarized state that generates the virtual image passes through the third electrically tunable half-wave plate 33 in the off state and is directed towards the second semi-transparent and semi-reflective mirror 82. The second semi-transparent and semi-reflective mirror 82 reflects the light of the first polarized state that generates the virtual image. The light of the first polarized state reflected by the second semi-transparent and semi-reflective mirror 82 passes through the third electrically tunable half-wave plate 33 in the off state, the fourth polarizing beam splitter 72, and the second mirror group 92 in sequence, and finally the light of the first polarized state that generates the virtual image reaches the user's second eye. In this situation, the real scene is projected from the side of the second semi-transparent mirror 82 away from the third electrically tunable half-wave plate 33 onto the second semi-transparent mirror 82. The second semi-transparent mirror 82 allows the second polarized light that generates the real scene image to pass through. The second polarized light that generates the real scene image passes through the second semi-transparent mirror 82 and passes through the second electrically tunable half-wave plate 33, which is in the closed state, and is projected onto the fourth polarization beam splitter 72. The fourth polarization beam splitter 72 reflects the second polarized light that generates the real scene image. The second polarized light that generates the real scene image reflected by the fourth polarization beam splitter 72 passes through the third electrically tunable half-wave plate 33 and the second semi-transparent mirror 82, which are in the closed state, in sequence. At this time, the real scene image will not enter the user's second eye, and the user's second eye can only see the virtual scene image.

[0133] When the first electrically tunable half-wave plate 31 switches from the on state to the off state, and the second electrically tunable half-wave plate 3 switches from the off state to the on state, the light emitted from the first electrically tunable half-wave plate 31 that generates the virtual image is directly reflected by the first polarizing beam splitter 41 to the first reflecting mirror 61. At this time, the light that generates the virtual image no longer shines on the third polarizing beam splitter 71. The second polarized light that generates the real image passes through the first semi-transparent and semi-reflective mirror 81 and shines on the second electrically tunable half-wave plate 3, which is in the on state. The second electrically tunable half-wave plate 3 converts the second polarized light that generates the real image into the first polarized light. The first polarized light that generates the real image passes through the third polarizing beam splitter 71 and the first mirror group 91 in sequence and shines on the user's first eye. At this time, the user's first eye can see the real image.

[0134] Display devices can switch the virtual scene presented to the user's second eye to a real scene. By combining the virtual and real scenes, the display device integrates the virtual scene with the real environment, enhancing the user's immersive experience.

[0135] In this application, when the first electrically tunable half-wave plate 31 is in the off state, the second electrically tunable half-wave plate 3 is in the off state, and the third electrically tunable half-wave plate 33 is in the on state, light of the first polarized state that generates the virtual scene enters the user's first eye, while light of the first polarized state that generates the real scene enters the user's second eye.

[0136] With the first electrically tunable half-wave plate 31 in the on state, the second electrically tunable half-wave plate 3 in the on state, and the third electrically tunable half-wave plate 33 in the off state, the light of the first polarized state that generates the real scene enters the user's first eye. At the same time, the light of the first polarized state that generates the real scene enters the user's second eye. The display device can present the real scene and the virtual scene to the user's eyes at the same time, enhancing the user's immersive experience.

[0137] The second mirror group 92 includes a fourth quarter-wave plate 92a, a second beam splitter 92b, and a fifth quarter-wave plate 92c stacked sequentially. The fourth quarter-wave plate 92a is located between the second beam splitter 92b and the fourth polarizing beam splitter 92. The fourth quarter-wave plate 92a is used to convert light of the second polarization state into light of the third polarization state, which is left-hand circularly polarized light (LCP). The second beam splitter 92b is used to convert light of the third polarization state into light of the fourth polarization state and reflect the converted light of the fourth polarization state, which is right-hand circularly polarized light (RCP). The fourth quarter-wave plate 92a is also used to convert light of the fourth polarization state into light of the first polarization state. The fourth quarter-wave plate 92a is also used to convert light of the first polarization state into light of the fourth polarization state. The second beam splitter 92b is used to allow light of the fourth polarization state to pass through. The fifth quarter-wave plate 92c is used to convert light of the fourth polarization state into light of the first polarization state.

[0138] In the embodiments provided in this application, the third polarizing beam splitter 71, the first mirror group 91, the second electrically tunable half-wave plate 32, and the first semi-transparent and semi-reflective mirror 81 constitute the first light transmission path 54. With the cooperation of the third polarizing beam splitter 71, the first mirror group 91, the second electrically tunable half-wave plate 32, and the first semi-transparent and semi-reflective mirror 81, the light that generates the virtual image can increase the number of reflections in the first light transmission path 54, thereby reducing the thickness of the first light transmission path 54 and further reducing the thickness of the display device. The first light transmission path 54 can be an optical engine.

[0139] The fourth polarizing beam splitter 72, the second mirror group 92, the third electrically tunable half-wave plate 33, and the second semi-transparent and semi-reflective mirror 82 constitute the second light transmission path 55. With the cooperation of the fourth polarizing beam splitter 72, the second mirror group 92, the third electrically tunable half-wave plate 33, and the second semi-transparent and semi-reflective mirror 82, the light that produces the virtual image can increase the number of reflections during transmission, thereby reducing the thickness of the second light transmission path 55 and further reducing the thickness of the display device. The second light transmission path 55 can be an optical engine.

[0140] The first semi-transparent and semi-reflective mirror 81 can be, but is not limited to, a plane mirror, a freeform mirror, a spherical mirror, an aspherical mirror, and a semi-transparent and semi-reflective curved mirror. When the first semi-transparent and semi-reflective mirror 81 is a semi-transparent and semi-reflective curved mirror, the side of the first semi-transparent and semi-reflective mirror 81 facing the second electrically adjustable half-wave plate 32 is concave in a direction away from the second electrically adjustable half-wave plate 32. The second semi-transparent and semi-reflective mirror 82 can be, but is not limited to, a plane mirror, a freeform mirror, a spherical mirror, an aspherical mirror, and a semi-transparent and semi-reflective curved mirror. When the second semi-transparent and semi-reflective mirror 82 is a semi-transparent and semi-reflective curved mirror, the side of the second semi-transparent and semi-reflective mirror 82 facing the third electrically adjustable half-wave plate 33 is concave in a direction away from the third electrically adjustable half-wave plate 33.

[0141] Please see Figure 10 The screen 1 of the display device can be a silicon-based liquid crystal display (LCD), and the silicon-based LCD can use the GLOBAL mode to light up the pixels.

[0142] Example 4

[0143] The difference between this embodiment and embodiment 3 is that please refer to [link / reference]. Figure 11 and Figure 12 The electrically tunable half-wave plate 3 includes a second electrically tunable half-wave plate 32, and the display device also includes a third polarizing beam splitter 71, a first semi-transparent and semi-reflective mirror 81, and a first mirror group 91;

[0144] The third polarizing beam splitter 71 is used to reflect the light of the first polarization state passing through the polarizing beam splitter 4 to the first mirror group 91. The first mirror group 91 is used to convert the light of the first polarization state into light of the second polarization state. The first mirror group 91 is also used to direct the light of the second polarization state obtained by the conversion onto the third polarizing beam splitter 71. The third polarizing beam splitter 71 is also used to allow the light of the second polarization state to pass through.

[0145] The timing cycle also includes a second timing cycle. The second electrically adjustable half-wave plate 32 is used to switch between a closed state and an open state according to the second timing cycle. When the second electrically adjustable half-wave plate 32 is in the open state, it is used to convert light of the first polarization state to light of the second polarization state, or to convert light of the second polarization state to light of the first polarization state. When the second electrically adjustable half-wave plate 32 is in the closed state, it is used to allow light of the first polarization state or light of the second polarization state to pass through. When the first electrically adjustable half-wave plate 31 is in the closed state, the second electrically adjustable half-wave plate 32 is in the closed state. When the first electrically adjustable half-wave plate 31 is in the open state, the second electrically adjustable half-wave plate 32 is in the open state.

[0146] The first semi-transparent and semi-reflective mirror 81 is used to reflect the second polarized light emitted from the second electrically tunable half-wave plate 32. The second polarized light reflected by the first semi-transparent and semi-reflective mirror 81 passes through the second electrically tunable half-wave plate 32, the third polarizing beam splitter 71 and the first mirror group 91 in sequence. The first semi-transparent and semi-reflective mirror 81 is also used to allow the first polarized light that generates the real scene to pass through. The third polarizing beam splitter is also used to reflect the first polarized light that generates the real scene emitted from the first semi-transparent and semi-reflective mirror 81.

[0147] The electrically tunable half-wave plate 3 also includes a third electrically tunable half-wave plate 33, and the display device also includes a fourth polarizing beam splitter 72, a second semi-transparent and semi-reflective mirror 82, and a second mirror group 92;

[0148] The fourth polarizing beam splitter 72 is used to reflect the light of the first polarization state passing through the polarizing beam splitter 4 to the second mirror group 92. The second mirror group 92 is used to convert the light of the first polarization state into light of the second polarization state, and to direct the converted light of the second polarization state toward the third polarizing beam splitter 71. The fourth polarizing beam splitter 72 is also used to allow the light of the second polarization state to pass through.

[0149] The third electrically tunable half-wave plate 33 is used to switch between a closed state and an open state according to a first timing period. When the third electrically tunable half-wave plate 33 is in the open state, it is used to convert light of the first polarization state to light of the second polarization state, or to convert light of the second polarization state to light of the first polarization state. When the second electrically tunable half-wave plate 32 is in the closed state, it is used to allow light of the first polarization state or light of the second polarization state to pass through. When the first electrically tunable half-wave plate 31 is in the closed state, the third electrically tunable half-wave plate 33 is in the open state. When the first electrically tunable half-wave plate 31 is in the open state, the third electrically tunable half-wave plate 33 is in the closed state.

[0150] The second semi-transparent and semi-reflective mirror 82 is used to reflect the second polarized light rays emitted from the third electrically tunable half-wave plate 33. The second polarized light rays reflected by the second semi-transparent and semi-reflective mirror 82 pass through the third electrically tunable half-wave plate 33, the fourth polarizing beam splitter 72, and the second mirror group 92 in sequence.

[0151] The second semi-transparent mirror 82 is also used to allow light of the first polarized state that generates the real scene to pass through, and the fourth polarized beam splitter is also used to reflect the light of the first polarized state that generates the real scene emitted by the third electrically tunable half-wave plate 33.

[0152] Please see Figure 11 The first electrically tunable half-wave plate 31 and the third electrically tunable half-wave plate 33 are both in the off state. The first electrically tunable half-wave plate 31 allows light of the first polarized state, which generates the virtual image, to pass through. This light is reflected by the first polarizing beam splitter 41 to the second reflecting mirror 62. The second reflecting mirror 62 reflects the light of the first polarized state to the fourth polarizing beam splitter 72. The fourth polarizing beam splitter 72 reflects the light of the first polarized state to the second mirror group 92. The second mirror group 92 converts the light of the first polarized state into light of the second polarized state, which then travels towards the fourth polarizing beam splitter 72. The second polarized light that generates the virtual image passes through the fourth polarizing beam splitter 72 and travels towards the third electrically tunable half-wave plate 33. The light of the second polarized state that generates the virtual image passes through the third electrically tunable half-wave plate 33, which is in the off state, and is directed towards the second semi-transparent and semi-reflective mirror 82. The second semi-transparent and semi-reflective mirror 82 reflects the light of the second polarized state that generates the virtual image. The light of the second polarized state that generates the virtual image passes through the third electrically tunable half-wave plate 33, the fourth polarizing beam splitter 72, and the second mirror group 92, which are in the off state, in sequence, and finally reaches the user's second eye. In this situation, the real scene is projected from the side of the second semi-transparent mirror 82 that is away from the third electrically tunable half-wave plate 33. The second semi-transparent mirror 82 allows the light of the first polarized state that generates the real scene image to pass through. The light of the first polarized state that generates the real scene image passes through the second semi-transparent mirror 82 and passes through the third electrically tunable half-wave plate 33, which is in the closed state, and is projected onto the fourth polarization beam splitter 72. The fourth polarization beam splitter 72 reflects the light of the first polarized state that generates the real scene image. The light of the first polarized state that generates the real scene image reflected by the fourth polarization beam splitter 72 passes through the third electrically tunable half-wave plate 33 and the second semi-transparent mirror 82, which are in the closed state, in sequence. At this time, the real scene image will not enter the user's second eye, and the user's second eye can only see the virtual scene image.

[0153] Please see Figure 12The first electrically tunable half-wave plate 31 switches from the off state to the on state, and the third electrically tunable half-wave plate 33 switches from the off state to the on state. The first electrically tunable half-wave plate 31 converts the light of the first polarization state into the light of the second polarization state. The light of the second polarization state that produces the virtual image emitted from the first electrically tunable half-wave plate 31 passes directly through the first polarization beam splitter 41. The light of the second polarization state that passes through the first polarization beam splitter 41 is converted by the first quarter-wave plate 51 into the light of the first polarization state that is reflected back to the first polarization beam splitter 41. The first polarization beam splitter 41 then makes the light of the first polarization state shine on the first reflector 61. At this time, the light that produces the virtual image no longer shines on the fourth polarization beam splitter 72. At this time, the light of the first polarized state that generates the real scene passes through the second semi-transparent and semi-reflective mirror 82 and is directed towards the second electrically tunable half-wave plate 32, which is in the open state. The second electrically tunable half-wave plate 32 converts the light of the first polarized state that generates the real scene into the light of the second polarized state. The light of the second polarized state that generates the real scene passes through the fourth polarizing beam splitter 72 and the second mirror group 92 in sequence and is directed towards the user's second eye. At this time, the user's second eye can see the real scene.

[0154] Understandably, when the first electrically tunable half-wave plate 31 switches from the off state to the on state, and the third electrically tunable half-wave plate 33 switches from the off state to the on state, the display device can switch the virtual scene presented to the user's first eye to the real scene. The display device combines the virtual scene and the real scene, making the virtual scene and the real scene environment blend into one, and enhancing the user's immersive experience.

[0155] The first electrically tunable half-wave plate 31 is in the open state. The first electrically tunable half-wave plate 31 converts the light of the first polarization state that produces the virtual image into light of the second polarization state. The light of the second polarization state passes through the first polarizing beam splitter 41 and is directed towards the first quarter-wave plate 51. The first quarter-wave plate 51 converts the light of the second polarization state back into light of the first polarization state. The first quarter-wave plate 51 causes the light of the first polarization state to be reflected back to the first polarizing beam splitter 41. The first polarizing beam splitter 41 reflects the light of the first polarization state to the first reflecting mirror 61. The first reflecting mirror 61 reflects the light of the first polarization state to the third polarizing beam splitter 71. The third polarizing beam splitter 71 reflects the light of the first polarization state that produces the virtual image to the first mirror group 91. The first mirror group 91 reflects the light of the first polarization state that produces the virtual image and then converts the light of the first polarization state back into light of the second polarization state that is directed towards the third polarizing beam splitter 71. When the second electrically tunable half-wave plate 32 is in the off state, the light of the second polarized state that generates the virtual image passes through the second electrically tunable half-wave plate 32 in the off state and is directed toward the first semi-transparent and semi-reflective mirror 81. The first semi-transparent and semi-reflective mirror 81 reflects the light of the second polarized state that generates the virtual image. The light of the second polarized state reflected by the first semi-transparent and semi-reflective mirror 81 passes in sequence through the second electrically tunable half-wave plate 32 in the off state, the third polarizing beam splitter 71, and the second mirror group 92, and finally the light of the second polarized state that generates the virtual image reaches the user's first eye. In this scenario, the real-world image is projected from the side of the first semi-transparent mirror 81 facing away from the second electrically tunable half-wave plate 32. The first semi-transparent mirror 81 allows light of the first polarized state that generates the real-world image to pass through. This light then passes through the second electrically tunable half-wave plate 32 (which is in a closed state) and is directed towards the third polarization beam splitter 71. The third polarization beam splitter 71 reflects the light of the first polarized state that generates the real-world image. The light of the first polarized state that generates the real-world image, reflected by the third polarization beam splitter 71, passes sequentially through the second electrically tunable half-wave plate 32 (which is in a closed state) and the first semi-transparent mirror. At this time, the real-world image does not enter the user's first eye; the user's first eye can only see the virtual image.

[0156] In this application, when the first electrically tunable half-wave plate 31 is in the off state, the second electrically tunable half-wave plate 32 is in the on state, and the third electrically tunable half-wave plate 33 is in the off state, the light of the second polarized state that generates the virtual image enters the user's second eye, while at the same time, the light of the second polarized state that generates the real image enters the user's first eye.

[0157] With the first electrically tunable half-wave plate 31 in the on state, the second electrically tunable half-wave plate 32 in the off state, and the third electrically tunable half-wave plate 33 in the on state, light of the second polarized state that generates the real scene enters the user's first eye. At the same time, light of the second polarized state that generates the real scene enters the user's second eye. The display device can present both the real scene and the virtual scene to the user's eyes simultaneously, enhancing the user's immersive experience.

[0158] Example 5

[0159] See Figure 13 and Figure 14 The display device includes a screen 1, a polarizer 2, an electrically tunable half-wave plate 3, a fifth polarizing beam splitter 73, a third semi-transparent and semi-reflective mirror 83, a third mirror group 93, a sixth polarizing beam splitter 74, a fourth semi-transparent and semi-reflective mirror 84, and a fourth mirror group 94. The display device can be used in augmented reality (AR).

[0160] Screen 1 includes a first screen 11 and a second screen 12; polarizer 2 includes a first polarizer 21 and a second polarizer 22; the first polarizer is used to convert the light from the first screen 11 into light with a second polarization state; electrically tunable half-wave plate 3 includes a fourth electrically tunable half-wave plate 34 and a fifth electrically tunable half-wave plate 35. The first screen 11 and the first polarizer 21 are stacked together, and the second screen 12 and the second polarizer 22 are stacked together.

[0161] In this application, the first screen 11, the first polarizer 21, the fourth electrically tunable half-wave plate 34, the third semi-transparent and semi-reflective mirror, the third mirror group 93, and the fifth polarizing beam splitter 73 can constitute the first optical transmission path 54, which can be an optomechanical system.

[0162] The second screen 12, the second polarizer 22, the fifth electrically tunable half-wave plate 35, the fourth semi-transparent and semi-reflective mirror 84, the fourth mirror group 94, and the sixth polarizing beam splitter 74 can form a second optical transmission path 55, which can be an optomechanical system.

[0163] In the first optical transmission path 54, the fifth polarizing beam splitter 73 is used to reflect the second polarized light from the first polarizing beam splitter 21 to the third mirror group 93. The third mirror group 93 is used to convert the second polarized light from the fifth polarizing beam splitter 73 into the first polarized light. The third mirror group 93 is also used to reflect the converted first polarized light back to the fifth polarizing beam splitter 73. The fifth polarizing beam splitter 73 is also used to allow the first polarized light to pass through.

[0164] The timing cycle includes a third timing cycle. The fourth electrically tunable half-wave plate 34 is used to switch between a closed state and an open state according to the third timing cycle. When the fourth electrically tunable half-wave plate 34 is in the open state, it is used to switch between light rays of the first polarization state and light rays of the second polarization state. When the fourth electrically tunable half-wave plate 34 is in the closed state, it is used to allow light rays of the first polarization state or light rays of the second polarization state to pass through.

[0165] The third semi-transparent and semi-reflective mirror is used to reflect the first polarized light emitted from the fourth electrically tunable half-wave plate 34. The first polarized light reflected by the third semi-transparent and semi-reflective mirror passes sequentially through the fourth electrically tunable half-wave plate 34, the fifth polarizing beam splitter 73, and the third mirror group 93. The third semi-transparent and semi-reflective mirror is used to allow the second polarized light that generates the real scene to pass through. The fifth polarizing beam splitter 73 is also used to reflect the second polarized light that generates the real scene emitted from the fourth electrically tunable half-wave plate 34.

[0166] The fifth polarizing beam splitter 73 and the fourth electrically tunable half-wave plate 34 are stacked together, and the third semi-transparent and semi-reflective mirror 83 is disposed on the side of the fourth electrically tunable half-wave plate 34 away from the fifth polarizing beam splitter 73; the third mirror group 93 is disposed on the side of the fifth polarizing beam splitter 73 away from the fourth electrically tunable half-wave plate 34.

[0167] Please see Figure 14 The light from the virtual image generated by the first screen 11 passes through the first polarizer 21. The first polarizer 21 allows the second polarized light from the generated virtual image to pass through. The second polarized light from the generated virtual image is reflected by the fifth polarizer 73 to the third mirror group 93. The third mirror group 93 converts the second polarized light into the first polarized light. The first polarized light from the third mirror group 93 is directed to the fifth polarizer 73. The first polarized light passes through the fifth polarizer 73 and is directed to the fourth electrically tunable half-wave plate 34.

[0168] When the fourth electrically tunable half-wave plate 34 is in the open state, it converts light of the first polarization state into light of the second polarization state. This second polarized light is then directed towards the third semi-transparent mirror 83, through which it exits. At this time, the user cannot see the virtual scene. However, the second polarized light reflected from the real scene passes through the third semi-transparent mirror 83, creating a real scene image. This second polarized light then travels to the fourth electrically tunable half-wave plate 34, which is in the open state. The fourth electrically tunable half-wave plate 34 converts this second polarized light into light of the first polarization state, which then travels towards the fifth polarizing beam splitter 73. This first polarized light then passes through the fifth polarizing beam splitter 73 and the third mirror group 93 before entering the user's eye, allowing the user to see the real scene.

[0169] When the fourth electrically tunable half-wave plate 34 is in the off state, the light of the first polarization state passes through the fourth electrically tunable half-wave plate 34 and is directed towards the third semi-transparent and semi-reflective mirror 83. The third semi-transparent and semi-reflective mirror 83 reflects the light of the second polarization state, so that the light of the second polarization state passes sequentially through the fourth electrically tunable half-wave plate 34, the fifth polarizing beam splitter 73, and the third mirror group 93 before entering the human eye. At this time, the user can see a virtual image. The second-polarized light reflected from the real scene passes through the third semi-transparent mirror 83 and is directed towards the fourth electrically adjustable half-wave plate 34, which is in the off state. The fourth electrically adjustable half-wave plate 34 allows the second-polarized light that generates the real scene image to pass through. The fourth electrically adjustable half-wave plate 34 directs the second-polarized light towards the fifth polarizing beam splitter 73. The fifth polarizing beam splitter 73 reflects the second-polarized light, causing the second-polarized light to be reflected back to the fourth electrically adjustable half-wave plate 34. The fourth electrically adjustable half-wave plate 34 allows the second-polarized light to pass through and be directed towards the third semi-transparent mirror 83. The second-polarized light passes through the third semi-transparent mirror 83 and exits the display device. At this time, the user cannot see the real scene image.

[0170] The third mirror group 93 includes a sixth quarter-wave plate 93a, a third beam splitter 93b, and a seventh quarter-wave plate 93c stacked sequentially. The sixth quarter-wave plate 93a is located between the third beam splitter 93b and the fifth polarizing beam splitter 73. The sixth quarter-wave plate 93a is used to convert light of the second polarization state into light of the third polarization state, which is left-handed circularly polarized light (LCP). The third beam splitter 93b is used to convert light of the third polarization state into light of the fourth polarization state, which is right-handed circularly polarized light (RCP). The third beam splitter 93b is also used to reflect the converted fourth polarization light back to the sixth quarter-wave plate 93a. The sixth quarter-wave plate 93a is also used to convert the fourth polarization light into light of the first polarization state. The sixth quarter-wave plate 93a is also used to convert the first polarization light into light of the fourth polarization state. The third beam splitter 93b is also used to allow the fourth polarization light to pass through. The seventh quarter-wave plate 93c is used to convert the fourth polarization light into light of the first polarization state.

[0171] In the first optical transmission path 54, when the pixels of the first screen 11 are lit and the fourth electrically tunable half-wave plate 34 is in the off state, the user can see the virtual image generated by the first screen 11 through the first optical transmission path 54. When the fourth electrically tunable half-wave plate 34 is in the off state, the user can see the real image through the first optical transmission path 54.

[0172] In the second optical transmission path 55, the sixth polarizing beam splitter 74 is used to reflect the second polarized light from the second polarizing beam splitter 22 to the fourth mirror group 94. The fourth mirror group 94 is used to convert the second polarized light from the sixth polarizing beam splitter 74 into the first polarized light. The fourth mirror group 94 is also used to reflect the converted first polarized light back to the sixth polarizing beam splitter 74. The sixth polarizing beam splitter 74 is also used to allow the first polarized light converted by the fourth mirror group 94 to pass through.

[0173] The timing cycle includes a fourth timing cycle. The fifth electrically tunable half-wave plate 35 is used to switch between a closed state and an open state according to the fourth timing cycle. When the fifth electrically tunable half-wave plate 35 is in the open state, it is used to convert light of the first polarization state to light of the second polarization state, or the fifth electrically tunable half-wave plate 35 is used to convert light of the second polarization state to light of the first polarization state. When the fifth electrically tunable half-wave plate 35 is in the closed state, the fifth electrically tunable half-wave plate 35 is in the open state. When the fourth electrically tunable half-wave plate 34 is in the open state, the fifth electrically tunable half-wave plate 35 is in the closed state.

[0174] The fourth semi-transparent and semi-reflective mirror 84 is used to reflect the first polarized light emitted from the fifth electrically tunable half-wave plate 35. The first polarized light reflected by the fourth semi-transparent and semi-reflective mirror 84 passes sequentially through the fifth electrically tunable half-wave plate 35, the sixth polarizing beam splitter 74, and the fourth mirror group 94. The fourth semi-transparent and semi-reflective mirror 84 is used to allow the second polarized light that generates the real scene to pass through. The sixth polarizing beam splitter 74 is used to reflect the second polarized light that generates the real scene emitted from the fifth electrically tunable half-wave plate 35.

[0175] The sixth polarizing beam splitter 74 and the fifth electrically tunable half-wave plate 35 are stacked together; the fourth semi-transparent and semi-reflective mirror 84 is disposed on the side of the fifth electrically tunable half-wave plate 35 away from the sixth polarizing beam splitter 74; the fourth mirror group 94 is disposed on the side of the sixth polarizing beam splitter 74 away from the fifth electrically tunable half-wave plate 35.

[0176] Please see Figure 13 When the pixels of the second screen 12 are lit, the light from the virtual image generated by the second screen 12 passes through the second polarizer 22. The second polarizer 22 allows the light from the virtual image to pass through in a second polarization state. The light from the virtual image in a second polarization state is reflected by the sixth polarizer 74 to the fourth mirror group 94. The fourth mirror group 94 converts the light from the second polarization state into light in a first polarization state. The light from the fourth mirror group 94, which converts it into light in a first polarization state, is directed towards the sixth polarizer 74. The light in a first polarization state passes through the sixth polarizer 74 and is directed towards the fifth electrically tunable half-wave plate 35.

[0177] When the fifth electrically tunable half-wave plate 35 is in the open state, it converts light from the first polarization state to the second polarization state. This second polarization light is then directed towards the fourth semi-transparent mirror 84, through which it exits. At this time, the user cannot see the virtual image. However, the second polarization light reflected from the real scene passes through the fourth semi-transparent mirror 84, creating a real image. This second polarization light then travels to the fifth electrically tunable half-wave plate 35, which converts it back to the first polarization state and directs it towards the sixth polarizing beam splitter 74. This first polarization light then passes through the sixth polarizing beam splitter 74 and the fourth mirror group 94 before entering the user's eye, allowing the user to see the real image.

[0178] When the fifth electrically tunable half-wave plate 35 is in the closed state, the light of the first polarization state passes through the fifth electrically tunable half-wave plate 35 and is directed towards the fourth semi-transparent and semi-reflective mirror 84. The fourth semi-transparent and semi-reflective mirror 84 reflects the light of the second polarization state, so that the light of the second polarization state passes sequentially through the fifth electrically tunable half-wave plate 35, the sixth polarizing beam splitter 74, and the fourth mirror group 94 before entering the human eye. At this time, the user can see a virtual image. The second-polarized light reflected from the real scene passes through the fourth semi-transparent mirror 84 and is directed towards the fifth electrically adjustable half-wave plate 35, which is in the off state. The fifth electrically adjustable half-wave plate 35 allows the second-polarized light that generates the real scene image to pass through. The fifth electrically adjustable half-wave plate 35 directs the second-polarized light towards the sixth polarizing beam splitter 74. The sixth polarizing beam splitter 74 reflects the second-polarized light, causing the second-polarized light to be reflected back to the fifth electrically adjustable half-wave plate 35. The fifth electrically adjustable half-wave plate 35 allows the second-polarized light to pass through and be directed towards the fourth semi-transparent mirror 84. The second-polarized light passes through the fourth semi-transparent mirror 84 and exits the display device. At this time, the user cannot see the real scene image.

[0179] In this application, the first screen 11 and the second screen 12 can alternately illuminate pixels according to a third timing cycle. When the first screen 11 is illuminated, the fourth electrically slewing half-wave plate 34 is in a closed state, and the fifth electrically slewing half-wave plate 35 is in a closed state. The user can see a virtual scene through the first light transmission path 54 and a real scene through the second light transmission path 55. The first light transmission path 54 and the second light transmission path 55 correspond to the user's two eyes, respectively. One of the user's eyes can see the virtual scene through the first light transmission path 54, and the other eye can see the real scene through the second light transmission path 55.

[0180] When the pixels of the second screen 12 are lit, the fourth electrically slewing half-wave plate 34 is in the on state, and the fifth electrically slewing half-wave plate 35 is in the off state. The user can see a virtual scene through the second light transmission path 55, and the user can see a real scene through the first light transmission path 54. The first light transmission path 54 and the second light transmission path 55 correspond to the user's two eyes respectively. The user's one eye can see a real scene through the first light transmission path 54, and the user's other eye can see a virtual scene through the second light transmission path 55.

[0181] The fourth mirror group 94 includes an eighth quarter-wave plate 94a, a fourth beam splitter 94b, and a ninth quarter-wave plate 94c stacked in sequence, with the eighth quarter-wave plate 94a located between the fourth beam splitter 94b and the fifth polarizing beam splitter 73.

[0182] The eighth quarter-wave plate 94a is used to convert light rays in the second polarization state into light rays in the third polarization state; the fourth beam splitter 94b is used to convert light rays in the third polarization state into light rays in the fourth polarization state, and the fourth beam splitter 94b is also used to reflect the light rays in the fourth polarization state obtained therefrom back to the eighth quarter-wave plate 94a; the eighth quarter-wave plate 94a is also used to convert light rays in the fourth polarization state into light rays in the first polarization state.

[0183] The eighth quarter-wave plate 94a is also used to convert light rays of the first polarization state into light rays of the fourth polarization state; the fourth beam splitter 94b is also used to allow light rays of the fourth polarization state to pass through.

[0184] The ninth quarter-wave plate 94c is used to convert light rays in the fourth polarization state into light rays in the first polarization state.

[0185] In the embodiments provided in this application, the fifth polarizing beam splitter 73, the third mirror group 93, the fourth electrically tunable half-wave plate 34, and the third semi-transparent and semi-reflective mirror 83 constitute the first light transmission path 54. With the cooperation of the fifth polarizing beam splitter 73, the third mirror group 93, the fourth electrically tunable half-wave plate 34, and the third semi-transparent and semi-reflective mirror 83, the light that generates the virtual image can increase the number of reflections in the first light transmission path 54, thereby reducing the thickness of the first light transmission path 54 and further reducing the thickness of the display device.

[0186] The sixth polarizing beam splitter 74, the fourth mirror group 94, the fifth electrically tunable half-wave plate 35, and the fourth semi-transparent and semi-reflective mirror 84 constitute the second light transmission path 55. With the cooperation of the sixth polarizing beam splitter 74, the fourth mirror group 94, the fifth electrically tunable half-wave plate 35, and the fourth semi-transparent and semi-reflective mirror 84, the light that produces the virtual image can increase the number of reflections during transmission, thereby reducing the thickness of the second light transmission path 55 and further reducing the thickness of the display device.

[0187] The third semi-transparent and semi-reflective mirror 83 can be a semi-transparent and semi-reflective curved mirror, and the third semi-transparent and semi-reflective mirror 83 is recessed towards the fourth electrically tunable half-wave plate 34 in a direction away from the fourth electrically tunable half-wave plate 34. The fourth semi-transparent and semi-reflective mirror 84 can be a semi-transparent and semi-reflective curved mirror, and the fourth semi-transparent and semi-reflective mirror 84 is recessed towards the fifth electrically tunable half-wave plate 35 in a direction away from the fifth electrically tunable half-wave plate 35.

[0188] Please refer to the embodiments provided in this application. Figure 15 , Figure 16 and Figure 17 The first screen 11 and / or the second screen 12 can be a liquid crystal on silicon (LCOS) or a digital micromirror device (DMD). The LCOS can illuminate the pixels of screen 1 using a GLOBAL mode, which includes a first time period and a second time period. Taking the first screen 11 illuminating pixels using a GLOBAL mode as an example, the first screen 11 prepares the pixels during the first time period. At this time, the fourth electrically tunable half-wave plate 34 is in the on state, and the third mirror group 93 of the display device presents a real scene. During the second time period, the first screen 11 illuminates the pixels, the fourth electrically tunable half-wave plate 34 is in the off state, and the third mirror group 93 of the display device presents a virtual scene. Taking the second screen 12 using Global mode to light up pixels as an example, the second screen 12 prepares pixels in the first time period. At this time, the fifth electrically tunable half-wave plate 35 is in the open state, and the fourth lens group 94 of the display device presents a blurred image. In the first time period, the second screen 12 lights up pixels, the fifth electrically tunable half-wave plate 35 is in the closed state, and the fourth lens group 94 of the display device presents a blurred image.

[0189] Please refer to the embodiments provided in this application. Figure 14 and Figure 18The first screen 11 and / or the second screen 12 can be made of micro light-emitting diodes (Micro LEDs), or the first screen 11 and / or the second screen 12 can be made of micro organic light-emitting diodes (Micro OLEDs). When the first screen 11 uses Micro LED or Micro OLED, the first screen 11 can use a rolling mode to illuminate pixels. In rolling mode, the first screen 11 illuminates pixels row by row. The phase of the fourth electrically tunable half-wave plate 34 corresponding to the illuminated pixel row of the first screen 11 is set to 0 (off state). The position of the fourth electrically tunable half-wave plate 34 corresponding to the illuminated pixel row of the first screen 11 is presented as a virtual scene through the third lens group 93. The phase of other positions in the fourth electrically tunable half-wave plate 34 that do not correspond to the illuminated pixel row of the first screen 11 is set to Π (on state). The other positions in the fourth electrically tunable half-wave plate 34 that do not correspond to the illuminated pixel row of the first screen 11 are presented as a real scene through the third lens group 93. In Rolling mode, the second screen 12 illuminates pixels line by line. The phase of the fifth electrically tunable half-wave plate 35 corresponding to the illuminated pixel row in the second screen 12 is set to 0 (off state). The position of the fifth electrically tunable half-wave plate 35 corresponding to the illuminated pixel row in the second screen 12 is presented as a virtual scene through the fourth lens group 94. The phase of other positions in the fifth electrically tunable half-wave plate 35 that do not correspond to the illuminated pixel row in the second screen 12 is set to Π (on state). The other positions in the fifth electrically tunable half-wave plate 35 that do not correspond to the illuminated pixel row in the second screen 12 are presented as a real scene through the fourth lens group 94.

[0190] It should be understood that expressions such as “comprising” and “may include” used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as “comprising” and / or “having” are to be interpreted as indicating a particular characteristic, number, operation, constituent element, component, or combination thereof, but not to exclude the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0191] Furthermore, in this application, the expression "and / or" includes any and all combinations of the associated listed words. For example, the expression "A and / or B" may include A, may include B, or may include both A and B.

[0192] In this application, expressions including ordinal numbers such as "first" and "second" may modify the elements. However, such elements are not limited by the foregoing expressions. For example, the foregoing expressions do not limit the order and / or importance of the elements. The foregoing expressions are only used to distinguish one element from other elements. For example, "first user equipment" and "second user equipment" refer to different user equipment, although both "first user equipment" and "second user equipment" are user equipment. Similarly, without departing from the scope of this application, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0193] When a component is referred to as "connected" or "accessed" to other components, it should be understood that this component not only connects directly to or accesses other components, but also that another component may exist between this component and other components. On the other hand, when a component is referred to as "directly connected" or "directly accessed" to other components, it should be understood that no component exists between them.

[0194] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A display device, characterized by comprising: The display device comprises a screen, a polarizer and an electrically controlled half-wave plate, the screen is stacked with the polarizer, the electrically controlled half-wave plate is arranged on the side of the polarizer away from the screen, and the polarizer is used for converting the light of the screen into light of a first polarization state or light of a second polarization state. The electrically controlled half-wave plate has a closed state and an open state, and is used for mutual switching between the closed state and the open state according to a time sequence cycle. The electrically controlled half-wave plate is used for converting the light of the first polarization state into the light of the second polarization state in the open state, or is used for converting the light of the second polarization state into the light of the first polarization state in the open state; and the electrically controlled half-wave plate is used for allowing the light of the first polarization state or the light of the second polarization state to pass through in the closed state, and the polarization directions of the light of the first polarization state and the light of the second polarization state are different.

2. The display device of claim 1, wherein, The display device further comprises a polarization beam splitter, the electrically controlled half-wave plate comprises a first electrically controlled half-wave plate, the first electrically controlled half-wave plate is stacked with the polarizer, the first electrically controlled half-wave plate is arranged on the side of the polarizer away from the screen, and the polarization beam splitter is arranged on the side of the first electrically controlled half-wave plate away from the polarizer. The time sequence cycle comprises a first time sequence cycle, and the screen is used for generating a first virtual image picture and a second virtual image picture according to the first time sequence cycle. The polarizer is used for converting the light of the screen for generating the first virtual image picture or the second virtual image picture into the light of the first polarization state. The first electrically controlled half-wave plate has a closed state and an open state, and is used for mutual switching between the closed state and the open state according to the first time sequence cycle. The first electrically controlled half-wave plate is used for allowing the light of the first polarization state for generating the first virtual image picture to pass through in the closed state, and is used for converting the light of the first polarization state for generating the second virtual image picture into the light of the second polarization state in the open state. The polarization beam splitter is used for splitting the light of the first polarization state for generating the first virtual image picture and the light of the second polarization state for generating the second virtual image picture into different light transmission paths.

3. The display device of claim 2, wherein, The polarization beam splitter comprises a first polarization beam splitter. The first polarization beam splitter is used for allowing the light of the first polarization state for generating the first virtual image picture to pass through, and is also used for reflecting the light of the second polarization state for generating the second virtual image picture; or the first polarization beam splitter is used for reflecting the light of the first polarization state for generating the first virtual image picture, and is also used for allowing the light of the second polarization state for generating the second virtual image picture to pass through.

4. The display device of claim 3, wherein, The display device further comprises a first quarter-wave plate arranged on the side of the polarization beam splitter away from the first electrically controlled half-wave plate. The first quarter-wave plate is used for converting the reflected light of the first polarization state into light of a second polarization state. Or, the first quarter-wave plate is used for converting the reflected light of the second polarization state into light of a first polarization state.

5. The display device of claim 4, wherein, The first quarter-wave plate and the first polarization beam splitter form an angle, and the first polarization beam splitter is configured to reflect the light of the second polarization state converted by the first quarter-wave plate or the light of the first polarization state converted by the first quarter-wave plate.

6. The display device of claim 2, wherein, The polarization beam splitter comprises a first polarization beam splitter and a second polarization beam splitter, the first polarization beam splitter and the second polarization beam splitter are connected and arranged in a cross manner, the first polarization beam splitter forms an angle with the first electrically-controlled half-wave plate, and the second polarization beam splitter forms an angle with the electrically-controlled half-wave plate, the first polarization beam splitter is configured to allow the light of the first polarization state from the first virtual image to pass through, and the second polarization beam splitter is configured to reflect the light of the first polarization state from the first virtual image. The second polarization beam splitter is configured to allow the light of the second polarization state from the second virtual image to pass through, and the first polarization beam splitter is configured to reflect the light of the second polarization state from the second virtual image.

7. The display device according to claim 4 or 5, wherein The display device further comprises a first reflector and a second reflector arranged in a spaced manner, the polarization beam splitter is arranged between the first reflector and the second reflector, the first reflector is configured to reflect the light of the first polarization state or the light of the second polarization state converted by the first quarter-wave plate, and the second reflector is configured to reflect the light of the first polarization state or the light of the second polarization state reflected by the polarization beam splitter.

8. The display device of claim 6, wherein, The display device further comprises a first reflector and a second reflector arranged in a spaced manner, the polarization beam splitter is arranged between the first reflector and the second reflector, the first reflector is configured to reflect the light of the first polarization state reflected by the second polarization beam splitter, and the second reflector is configured to reflect the light of the second polarization state reflected by the first polarization beam splitter.

9. The display device of claim 4 or 5, wherein, The electrically-controlled half-wave plate further comprises a second electrically-controlled half-wave plate, the display device further comprises a third polarization beam splitter, a first half-transmission half-reflection mirror, and a first mirror group. The third polarization beam splitter is configured to reflect the light of the second polarization state passing through the polarization beam splitter to the first mirror group, the first mirror group is configured to convert the light of the second polarization state into the light of the first polarization state, the first mirror group is further configured to direct the light of the first polarization state converted thereby to the third polarization beam splitter, and the third polarization beam splitter is further configured to allow the light of the first polarization state to pass through. The second electrically-controlled half-wave plate is configured to switch between a closed state and an open state according to a first time sequence period, the second electrically-controlled half-wave plate is configured to convert the light of the first polarization state into the light of the second polarization state when in the open state, or the second electrically-controlled half-wave plate is configured to convert the light of the second polarization state into the light of the first polarization state when in the open state, and the second electrically-controlled half-wave plate is configured to allow the light of the first polarization state or the light of the second polarization state to pass through when in the closed state; when the first electrically-controlled half-wave plate is in the closed state, the second electrically-controlled half-wave plate is in the closed state; and when the first electrically-controlled half-wave plate is in the open state, the second electrically-controlled half-wave plate is in the open state. The first half-transmissive half-reflective mirror is configured to reflect light of the first polarization state from the second electrically tunable half-wave plate, and the reflected light of the first polarization state passes through the second electrically tunable half-wave plate, the third polarization beam splitter and the first lens group in sequence; the first half-transmissive half-reflective mirror is also configured to allow light of a second polarization state for generating a real scene image to pass through, and the third polarization beam splitter is further configured to reflect light of the second polarization state for generating a real scene image from the second electrically tunable half-wave plate.

10. The display device of claim 9, wherein, The electrically tunable half-wave plate further comprises a third electrically tunable half-wave plate, and the display device further comprises a fourth polarization beam splitter, a second half-transmissive half-reflective mirror and a second lens group. The fourth polarization beam splitter is configured to reflect light of the second polarization state passing through the polarization beam splitter to the second lens group, the second lens group is configured to convert the light of the second polarization state into light of the first polarization state, the second lens group is further configured to emit the converted light of the first polarization state to the fourth polarization beam splitter, and the fourth polarization beam splitter is further configured to allow the light of the first polarization state to pass through. The timing cycle further comprises a second timing cycle, the third electrically tunable half-wave plate is configured to switch between the closed state and the open state according to the second timing cycle, the third electrically tunable half-wave plate is configured to convert the light of the first polarization state into the light of the second polarization state when in the open state, or the third electrically tunable half-wave plate is configured to convert the light of the second polarization state into the light of the first polarization state when in the open state; the second electrically tunable half-wave plate is configured to allow the light of the first polarization state or the light of the second polarization state to pass through when in the closed state; when the first electrically tunable half-wave plate is in the closed state, the third electrically tunable half-wave plate is in the open state; when the first electrically tunable half-wave plate is in the open state, the third electrically tunable half-wave plate is in the closed state. The second half-transmissive half-reflective mirror is configured to reflect light of the first polarization state from the third electrically tunable half-wave plate, and the reflected light of the first polarization state passes through the third electrically tunable half-wave plate, the fourth polarization beam splitter and the second lens group in sequence; the second half-transmissive half-reflective mirror is also configured to allow light of a second polarization state for generating a real scene image to pass through, and the fourth polarization beam splitter is further configured to reflect light of the second polarization state for generating a real scene image from the third electrically tunable half-wave plate.

11. The display device of claim 9, wherein, The third polarization beam splitter and the second electrically tunable half-wave plate are stacked, the first lens group is located on a side of the third polarization beam splitter away from the second electrically tunable half-wave plate, and the first half-transmissive half-reflective mirror is arranged on a side of the second electrically tunable half-wave plate away from the third polarization beam splitter.

12. The display device of claim 10, wherein, The fourth polarization beam splitter and the third electrically tunable half-wave plate are stacked, the second lens group is located on a side of the fourth polarization beam splitter away from the third electrically tunable half-wave plate, and the second half-transmissive half-reflective mirror is arranged on a side of the third electrically tunable half-wave plate away from the fourth polarization beam splitter.

13. The display device according to claim 9 or 11, wherein The first lens group comprises a second quarter-wave plate, a first beam splitter and a third quarter-wave plate stacked in sequence, and the second quarter-wave plate is located between the first beam splitter and the third polarization beam splitter. The second quarter-wave plate is configured to convert the light of the second polarization state into light of a third polarization state; the first light-splitting plate is configured to convert the light of the third polarization state into light of a fourth polarization state and reflect the converted light of the fourth polarization state; the second quarter-wave plate is further configured to convert the light of the fourth polarization state into light of the first polarization state; the second quarter-wave plate is further configured to convert the light of the first polarization state into light of the fourth polarization state; and the first light-splitting plate is configured to allow the outcoming light of the fourth polarization state to pass through. The third quarter-wave plate is configured to convert the light of the fourth polarization state into light of the first polarization state.

14. The display device of claim 10 or 12, wherein, The second mirror group comprises, in sequence, a fourth quarter-wave plate, a second light-splitting plate, and a fifth quarter-wave plate, and the fourth quarter-wave plate is located between the second light-splitting plate and the fourth polarization light-splitting plate. The fourth quarter-wave plate is configured to convert the light of the second polarization state into light of a third polarization state; the second light-splitting plate is configured to convert the light of the third polarization state into light of a fourth polarization state and reflect the converted light of the fourth polarization state; the fourth quarter-wave plate is further configured to convert the light of the fourth polarization state into light of the first polarization state; the fourth quarter-wave plate is further configured to convert the light of the first polarization state into light of the fourth polarization state; and the second light-splitting plate is configured to allow the outcoming light of the fourth polarization state to pass through. The fifth quarter-wave plate is configured to convert the light of the fourth polarization state into light of the first polarization state.

15. The display device of any one of claims 4, 5, and 10, wherein, The electrically-adjustable half-wave plate further comprises a second electrically-adjustable half-wave plate, and the display device further comprises a third polarization light-splitting plate, a first half-transmissive half-reflective mirror, and a first mirror group. The third polarization light-splitting plate is configured to reflect the light of the first polarization state that passes through the polarization light-splitting plate to the first mirror group, the first mirror group is configured to convert the light of the first polarization state into light of a second polarization state, the first mirror group is further configured to direct the converted light of the second polarization state to the third polarization light-splitting plate, and the third polarization light-splitting plate is further configured to allow the light of the second polarization state to pass through. The timing cycle further comprises a second timing cycle, the second electrically-adjustable half-wave plate is configured to switch between a closed state and an open state according to the second timing cycle, the second electrically-adjustable half-wave plate is configured to convert the light of the first polarization state into light of the second polarization state when in the open state, or the second electrically-adjustable half-wave plate is configured to convert the light of the second polarization state into light of the first polarization state when in the open state, the second electrically-adjustable half-wave plate is configured to allow the light of the first polarization state or the light of the second polarization state to pass through when in the closed state; when the first electrically-adjustable half-wave plate is in the closed state, the second electrically-adjustable half-wave plate is in the open state; and when the first electrically-adjustable half-wave plate is in the open state, the second electrically-adjustable half-wave plate is in the closed state. The first half-transmissive half-reflective mirror is configured to reflect light of the second polarization state from the second electrically-controlled half-wave plate, and the reflected light of the second polarization state passes through the second electrically-controlled half-wave plate, the third polarization beam splitter and the first mirror group in sequence; the first half-transmissive half-reflective mirror is also configured to allow light of the first polarization state for generating a real scene image to pass through, and the third polarization beam splitter is further configured to reflect the light of the first polarization state for generating a real scene image from the first half-transmissive half-reflective mirror.

16. The display device of claim 15, wherein, The electrically-controlled half-wave plate further comprises a third electrically-controlled half-wave plate, and the display device further comprises a fourth polarization beam splitter, a second half-transmissive half-reflective mirror and a second mirror group. The fourth polarization beam splitter is configured to reflect light of the first polarization state passing through the polarization beam splitter to the second mirror group, the second mirror group is configured to convert the light of the first polarization state into light of the second polarization state, and the converted light of the second polarization state is directed to the fourth polarization beam splitter, and the fourth polarization beam splitter is further configured to allow the light of the second polarization state to pass through. The third electrically-controlled half-wave plate is configured to switch between a closed state and an open state according to a first time sequence period, the third electrically-controlled half-wave plate is configured to convert the light of the first polarization state into the light of the second polarization state when in the open state, or the third electrically-controlled half-wave plate is configured to convert the light of the second polarization state into the light of the first polarization state when in the open state, and the second electrically-controlled half-wave plate is configured to allow the light of the first polarization state or the light of the second polarization state to pass through when in the closed state; when the first electrically-controlled half-wave plate is in the closed state, the third electrically-controlled half-wave plate is in the closed state; and when the first electrically-controlled half-wave plate is in the open state, the third electrically-controlled half-wave plate is in the open state. The second half-transmissive half-reflective mirror is configured to reflect light of the second polarization state from the third electrically-controlled half-wave plate, and the reflected light of the second polarization state passes through the third electrically-controlled half-wave plate, the fourth polarization beam splitter and the second mirror group in sequence. The second half-transmissive half-reflective mirror is also configured to allow light of the first polarization state for generating a real scene image to pass through, and the fourth polarization beam splitter is further configured to reflect the light of the first polarization state for generating a real scene image from the third electrically-controlled half-wave plate.

17. The display device of claim 1, wherein, The screen comprises a first screen, and the polarizer comprises a first polarizer; the first screen is arranged in a stack with the first polarizer; and the first polarizer is configured to convert light of the first screen into light of the second polarization state. The electrically-controlled half-wave plate comprises a fourth electrically-controlled half-wave plate, and the display device further comprises a fifth polarization beam splitter, a third half-transmissive half-reflective mirror and a third mirror group. The fifth polarization beam splitter is configured to reflect light of the second polarization state from the first polarizer to the third mirror group, the third mirror group is configured to convert the light of the second polarization state from the fifth polarization beam splitter into light of the first polarization state, the third mirror group is further configured to reflect the converted light of the first polarization state to the fifth polarization beam splitter, and the fifth polarization beam splitter is further configured to allow the light of the first polarization state to pass through. The timing cycle includes a third timing cycle, the fourth electrically tunable half-wave plate is used for mutual switching of the closed state and the open state according to the third timing cycle, and the fourth electrically tunable half-wave plate is used for realizing mutual switching of the light of the first polarization state and the light of the second polarization state in the open state; the fourth electrically tunable half-wave plate is used for allowing the light of the first polarization state or the light of the second polarization state to pass through in the closed state; The third semi-transmissive semi-reflective mirror is used for reflecting the light of the first polarization state emitted from the fourth electrically tunable half-wave plate, the light of the first polarization state reflected by the third semi-transmissive semi-reflective mirror passes through the fourth electrically tunable half-wave plate, the fifth polarization beam splitter and the third lens group in turn, the fifth polarization beam splitter is further used for reflecting the light of the second polarization state emitted from the fourth electrically tunable half-wave plate to generate the real scene picture.

18. The display device of claim 17, wherein, The fifth polarization beam splitter and the fourth electrically tunable half-wave plate are arranged in a stack, the third semi-transmissive semi-reflective mirror is arranged on a side of the fourth electrically tunable half-wave plate away from the fifth polarization beam splitter, and the third lens group is arranged on a side of the fifth polarization beam splitter away from the fourth electrically tunable half-wave plate.

19. The display device of claim 17 or 18, wherein, The screen further includes a second screen, and the polarizer further includes a second polarizer, and the second screen and the second polarizer are arranged in a stack. The electrically tunable half-wave plate further includes a fifth electrically tunable half-wave plate, and the display device further includes a sixth polarization beam splitter, a fourth semi-transmissive semi-reflective mirror and a fourth lens group. The sixth polarization beam splitter is used for reflecting the light of the second polarization state emitted from the second polarizer to the fourth lens group, the fourth lens group is used for converting the light of the second polarization state emitted from the sixth polarization beam splitter into the light of the first polarization state, the fourth lens group is further used for reflecting the light of the first polarization state converted by the fourth lens group to the sixth polarization beam splitter, and the sixth polarization beam splitter is further used for allowing the light of the first polarization state converted by the fourth lens group to pass through. The timing cycle includes a fourth timing cycle, the fifth electrically tunable half-wave plate is used for mutual switching of the closed state and the open state according to the fourth timing cycle, the fifth electrically tunable half-wave plate is used for converting the light of the first polarization state into the light of the second polarization state in the open state, or the fifth electrically tunable half-wave plate is used for converting the light of the second polarization state into the light of the first polarization state in the open state, the fifth electrically tunable half-wave plate is used for allowing the light of the first polarization state or the light of the second polarization state to pass through in the closed state, the fifth electrically tunable half-wave plate is in the open state when the fourth electrically tunable half-wave plate is in the closed state, and the fifth electrically tunable half-wave plate is in the closed state when the fourth electrically tunable half-wave plate is in the open state. The fourth transflector is configured to reflect the light of the first polarization state from the fifth electrically tunable half-wave plate, and the light of the first polarization state reflected by the fourth transflector passes through the fifth electrically tunable half-wave plate, the sixth polarizing beam splitter and the fourth lens group in sequence; the fourth transflector is configured to allow the light of the second polarization state for generating the real scene image to pass through, and the sixth polarizing beam splitter is configured to reflect the light of the second polarization state for generating the real scene image from the fifth electrically tunable half-wave plate.

20. The display device of claim 19, wherein, The sixth polarizing beam splitter is stacked with the fifth electrically tunable half-wave plate, the fourth transflector is arranged on the side of the fifth electrically tunable half-wave plate away from the sixth polarizing beam splitter, and the fourth lens group is arranged on the side of the sixth polarizing beam splitter away from the fifth electrically tunable half-wave plate.

21. The display device of claim 17 or 18, wherein, The third lens group comprises a sixth quarter-wave plate, a third beam splitter and a seventh quarter-wave plate which are stacked in sequence, and the sixth quarter-wave plate is located between the third beam splitter and the fifth polarizing beam splitter. The sixth quarter-wave plate is configured to convert the light of the second polarization state into light of a third polarization state, the third beam splitter is configured to convert the light of the third polarization state into light of a fourth polarization state, the third beam splitter is further configured to reflect the light of the fourth polarization state obtained by conversion to the sixth quarter-wave plate, the sixth quarter-wave plate is further configured to convert the light of the fourth polarization state into light of the first polarization state, the sixth quarter-wave plate is further configured to convert the light of the first polarization state into light of the fourth polarization state, and the third beam splitter is further configured to allow the light of the fourth polarization state to pass through. The seventh quarter-wave plate is configured to convert the light of the fourth polarization state into light of the first polarization state.

22. The display device of claim 19 or 20, wherein, The fourth lens group comprises an eighth quarter-wave plate, a fourth beam splitter and a ninth quarter-wave plate which are stacked in sequence, and the eighth quarter-wave plate is located between the fourth beam splitter and the fifth polarizing beam splitter. The eighth quarter-wave plate is configured to convert the light of the second polarization state into light of the third polarization state, the fourth beam splitter is configured to convert the light of the third polarization state into light of the fourth polarization state, the fourth beam splitter is further configured to reflect the light of the fourth polarization state obtained by conversion to the eighth quarter-wave plate, and the eighth quarter-wave plate is further configured to convert the light of the fourth polarization state into light of the first polarization state. The eighth quarter-wave plate is further configured to convert the light of the first polarization state into light of the fourth polarization state, and the fourth beam splitter is further configured to allow the light of the fourth polarization state to pass through. The ninth quarter-wave plate is configured to convert the light of the fourth polarization state into light of the first polarization state.

23. Eyeglasses, characterized in that The eyeglasses comprise an eyeglass frame and the display device according to any one of claims 1-22, and the eyeglass frame is connected with the display device.

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