CN110727111A - Head-mounted display optical system and head-mounted display equipment - Google Patents

Abstract

The invention discloses a head-mounted display optical system and a head-mounted display device, wherein the head-mounted display optical system includes a projection display device and an eye tracking device. Wherein, an eye tracking device is used to identify the gaze point and gaze depth information of human eyes, and feed back the gaze point and gaze depth information to the projection display device; the projection display device is used for virtual imaging, and The virtual imaging distance is adjusted according to the gaze point and gaze depth information fed back by the eye tracking device, so that the virtual imaging distance matches the gaze depth of the human eye detected by the eye tracking device. The invention adjusts the virtual imaging distance by understanding the gaze point, gaze depth and other information of the human eye, so that the virtual imaging distance matches the gaze depth of the human eye, so as to achieve better immersion experience and human-computer interaction experience. The eye tracking device is integrated with the projection display device to reduce the volume of the display module, which is conducive to the miniaturization and thinning of the augmented reality display device.

Description

A head-mounted display optical system and a head-mounted display device

technical field

The present invention relates to the technical field of display devices, and in particular, to a head-mounted display optical system and a head-mounted display device.

Background technique

With the continuous development of science and technology, more and more display devices are widely used in people's daily life and work, bringing great convenience to people's daily life and work, and becoming an indispensable tool for people today . Among them, head-mounted display technology has also developed by leaps and bounds as a new technology that combines optics, electronics, software interaction and other fields.

Microdisplays and optical systems in head mounted displays (HMDs) project images from the microdisplays to the user's eyes and allow the user to see the real world. Head-mounted displays have many practical and recreational applications, such as aviation and aerospace applications that allow pilots to see important flight control information without taking their eyes off the flight path; public safety applications include tactical maps and thermal imaging display; other applications include video games, transportation, and radio communications.

With the development of HMD technology, the understanding and interaction between people and the environment and virtual content has gradually become a key requirement, and the interaction of human visual senses has also become a research hotspot. Use eye tracking technology to obtain eye movement information, and obtain eye gaze, convergence, rotation and pupil changes by tracking one of the information such as eye and peripheral feature changes, iris angle changes or iris reflection characteristics, so as to realize the understanding of human visual senses , and feedback it to the display content processing unit for corresponding matching to enhance the overall visual immersion. In the application field of head-mounted display devices, eye tracking has become an important interaction method during its use.

Using eye tracking, it can understand the focus of the human eye, viewing distance, and stress response, adjust the HMD display content in real time, and enhance the user's visual immersion. In a known class of applications, eye tracking enables foveated rendering, that is, high-definition rendering of the area where the human eye is fixed, and the peripheral field of view reduces the rendering rate to reduce processing unit costs. In one known non-contact optical eye-tracking technique, a light source emits infrared light, which is reflected from the eye and received by an image sensor, and the information sensed by the image sensor is analyzed to learn from changes in the reflected light Eye movements such as gaze direction or pupil position.

In recent years, with the development of science and technology, virtual reality head-mounted display devices equipped with eye-tracking technology have been launched at home and abroad to capture eye-movement behavior in a virtual environment for data analysis, or through eye-tracking devices and virtual environments. things interact. The eye-tracking function introduced into traditional head-mounted display devices is mainly used to expand the field of view through gaze tracking. There is little research on improving user immersion experience and human-computer interaction experience, and additionally added to the head-mounted display module. Eye tracking optics will also bring great challenges to the miniaturization and aesthetics of the display module.

Therefore, the existing technology has shortcomings and needs to be improved.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a head-mounted display optical system and a head-mounted display device.

The technical solutions of the present invention are as follows: a head-mounted display optical system is provided, which includes a projection display device and an eye tracking device.

The eye tracking device is used for identifying the gaze point and gaze depth information of human eyes, and feeding back the gaze point and gaze depth information to the projection display device.

The projection display device is used for virtual imaging, and is used for adjusting the virtual imaging distance according to the gaze point and gaze depth information fed back by the eye tracking device, so that the virtual imaging distance is the same as that detected by the eye tracking device. Human eye gaze depth matches.

Further, the projection display device includes: an image generating unit, a first optical unit, and a second optical unit.

The image generating unit is used for generating and emitting a light beam carrying image information.

The first optical unit is used for reflecting the light beam emitted by the image generating unit to the second optical unit, and the second optical unit is used for reflecting the light beam reflected by the first optical unit, The light beam reflected by the second optical unit returns to the first optical unit, and enters the user's eyes after being transmitted through the first optical unit.

Further, the eye tracking device includes: an infrared light source, a transmissive mirror unit, a thermal mirror and an image receiving unit.

The infrared light source is used to generate an infrared light beam, the infrared light beam is transmitted to the thermal mirror through the transflective mirror unit, reflected to the first optical unit through the thermal mirror, and passed through the first optical unit. An optical unit is reflected into the second optical unit, then reflected back to the first optical unit through the second optical unit, and finally transmitted through the first optical unit into the user's eyes.

The infrared light beam entering the user's eye is reflected back to the first optical unit by the user's eye, transmitted through the first optical unit and enters the second optical unit, and sequentially passes through the second optical unit and the first optical unit Reflected to the hot mirror, and reflected to the lenticular unit through the thermal mirror, and finally reflected to the image receiving unit through the lenticular unit.

The image receiving unit identifies the gaze point and gaze depth information of the human eye according to the received infrared beam reflected by the user's eyes, and feeds back the gaze point and gaze depth information to the image generating unit.

Further, the image generating unit emits a light beam carrying image information, and enters the first optical unit after being transmitted through the thermal mirror.

The image generating unit is further configured to adjust the virtual imaging distance according to the gaze point and gaze depth information fed back by the image receiving unit, so that the virtual imaging distance is consistent with the gaze depth of the human eye detected by the eye tracking device. match.

Further, the image generating unit includes an image source, a micro-actuating structure and a first lens unit, and the micro-actuating structure is used to adjust the position of the image source or the first lens unit, thereby modulating the projection image surface. Focus depth or adjust the effective focal length of the projection display device. or,

The image generating unit includes an image source and a second lens unit, and the second lens unit is configured to transmit the light beam generated by the image source and adjust the effective focal length of the projection display device.

Further, the second lens unit is an adjustable focus lens unit, which is composed of at least one adjustable focus collimating lens, and the image source is coaxial with the second lens unit.

Further, the surface of the first optical unit is provided with a transflective film, and the ratio of transmittance to reflectivity of the transflective film is 1:1.

The surface of the second optical unit is provided with a transflective film, the ratio of transmittance to reflectivity of the transflective film is 1:1, and the surface type of the second optical unit is spherical, aspherical, or free-form surface. any of the.

The central axis of the first optical unit forms an included angle of 45° with the central axis of the image generating unit of the projection display device.

The central axis of the second optical unit forms an included angle of 90° with the central axis of the image generating unit.

Further, the central axis of the image generating unit and the central axis of the second optical unit are perpendicular to the first optical unit.

Further, the mirror unit is a half mirror, the surface of the mirror unit is coated with a filter film, and only responds to infrared light beams.

The image receiving unit is an infrared image sensor.

The central axis of the thermal mirror and the central axis of the image generating unit of the projection display device form an included angle of 45°.

The central axis of the lens unit and the central axis of the light beam emitted by the infrared light source form an included angle of 45°.

The present invention also provides a head-mounted display device including the above-mentioned head-mounted display optical system.

By adopting the above scheme, the beneficial effect of the present invention is that: by understanding the gaze point, gaze depth and other information of the human eye, the virtual imaging distance is adjusted so that the virtual imaging distance matches the gaze depth of the human eye, so as to achieve a better immersive experience and human computer interaction experience. The eye tracking optical system is optically integrated with the projection display to reduce the volume of the display module, which is conducive to the miniaturization and thinning of the augmented reality display device.

Description of drawings

1 is a schematic structural diagram of a head-mounted display optical system of the present invention;

2 is a schematic structural diagram of an embodiment of a head-mounted display optical system according to the present invention;

FIG. 3 is a schematic structural diagram of another embodiment of the head-mounted display optical system of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or indirectly on the another element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

Referring to FIGS. 1 to 3 , the present invention provides a head-mounted display optical system, including a projection display device and an eye tracking device. The eye tracking device is used for identifying the gaze point and gaze depth information of human eyes, and feeding the gaze point and gaze depth information back to the projection display device. The projection display device is used for virtual imaging, and at the same time, the virtual imaging distance can be adjusted according to the gaze point and gaze depth information fed back by the eye tracking device, so that the virtual imaging distance is consistent with the human eye gaze depth detected by the eye tracking device. match.

Specifically, the projection display device includes: an image generating unit 1, a first optical unit 2 and a second optical unit 3, the image generating unit 1 is used for generating and emitting light beams carrying image information, The gaze point and gaze depth information fed back by the eye tracking device adjusts the virtual imaging distance, so that the virtual imaging distance matches the gaze depth of the human eye detected by the eye tracking device; the first optical unit 2 is used for Reflecting the light beam emitted by the image generating unit 1 to the second optical unit 3, the second optical unit 3 is used for reflecting the light beam reflected by the first optical unit 2, The light beam reflected by the unit 3 returns to the first optical unit 2 and enters the user's eye 4 after being transmitted through the first optical unit 2 . The central axis of the first optical unit 2 forms an included angle of 45° with the central axis of the image generating unit 1 , the surface of the first optical unit 2 is provided with a transflective film, and the transmission of the first optical unit 2 The ratio of ratio to reflectivity is 1:1, or a transflective film set in other special ratios; the central axis of the second optical unit 3 forms an included angle of 90° with the central axis of the image generating unit 1, and the The surface of the second optical unit 3 is provided with a transflective film, and the ratio of the transmittance to the reflectivity of the second optical unit 3 is 1:1, or a transflective film set in other special ratios. The two optical units are any of spherical, aspherical and free-form surface structures. Specifically, in this embodiment, the central axis of the second optical unit 3 is the X axis, the central axis of the image generating unit 1 is the Y axis, and the X axis and the Y axis are perpendicular to each other. Specifically, In this embodiment, the central axis of the image generating unit 1 and the central axis of the second optical unit 3 are perpendicular to the first optical unit 2 .

The eye tracking device includes: an infrared light source L, a transmissive mirror unit M2, a thermal mirror M1, and an image receiving unit C. The infrared light source L is used to generate an infrared light beam, and the infrared light beam is transmitted to the thermal mirror M1 through the transmissive mirror unit M2, and reflected to the first optical unit 2 through the thermal mirror M1, and reflected by the first optical unit 2 into the second optical unit 3 , and then reflected back to the first optical unit 2 by the second optical unit 3 , and finally transmitted through the first optical unit 2 into the user eyes 4. The infrared light beam entering the user's eye 4 is reflected back to the first optical unit 2 by the user's eye 4, transmitted through the first optical unit 2 and enters the second optical unit 3, and passes through the second optical unit 3 and The first optical unit 2 is reflected to the hot mirror M1, reflected to the mirror unit M2 by the hot mirror M1, and finally reflected to the image receiving unit by the mirror unit M2 C. The image receiving unit C identifies the gaze point and gaze depth information of the human eye according to the received infrared beam reflected by the user's glasses 4 , and feeds the gaze point and gaze depth information back to the image generating unit 1 . Specifically, in this embodiment, the lens unit M2 is a half mirror, the surface of the lens unit M2 is coated with a filter film, and only responds to infrared light beams. The central axis forms an angle of 45° with the central axis of the beam emitted by the infrared light source L, and the central axis of the thermal mirror M1 forms an angle of 45° with the central axis of the image generating unit 1 .

Referring to FIG. 1, the working principle of the head-mounted display optical system provided by the present invention is as follows:

Image projection process: the image generating unit 1 generates and emits a light beam a carrying image information, and after reaching the first optical unit 2, the first optical unit 2 reflects the light beam a to the second optical unit 3, and is reflected by the second optical unit 3 The rear light beam a returns to the first optical unit 2 and is transmitted through the first optical unit 2 into the user's field of view, that is, the user's eyes 4 .

Eye tracking process: the infrared light source L generates an infrared beam b, which is transmitted to the thermal mirror M1 through the mirror unit M2, reflected to the first optical unit 2 by the thermal mirror M1, and reflected by the first optical unit 2 into the first optical unit 2. The second optical unit 3 is reflected back to the first optical unit 2 through the second optical unit 3 , and finally transmitted through the first optical unit 2 into the user's eye 4 . The infrared light beam b entering the user's eye 4 is reflected back to the first optical unit 2 by the user's eye 4 , transmitted through the first optical unit 2 into the second optical unit 3 , and passed through the second optical unit 3 and the first optical unit 2 in turn It is reflected to the hot mirror M1, reflected to the lenticular mirror unit M2 through the thermal mirror M1, and finally reflected to the image receiving unit C through the lenticular mirror unit M2. The image receiving unit C identifies the gaze point and gaze depth information of the human eye according to the received infrared beam b reflected by the user's glasses 4, and feeds back the gaze point and gaze depth information to the image generating unit 1, and the image generating unit 1 according to The received gaze point and gaze depth information adjusts the virtual imaging distance of the projection display device, and makes the virtual imaging distance match the gaze depth of the human eye detected by the eye tracking device.

Please refer to FIG. 1 and FIG. 2 , which are an embodiment of the present invention. In this embodiment, the image generating unit 1 includes an image source DS, a micro-actuating structure A1 and a first lens unit 5 . The image source DS can generate and emit light beams carrying image information, and the image source DS is a microdisplay. Specifically, in this embodiment, the image source DS is an OLED display, an LCD display, or an LCOS display. The micro-actuating structure A1 is used to adjust the position of the image source DS, so as to modulate the focal depth of the projected image surface, or to adjust the position of the first lens unit 5, thereby adjusting the effectiveness of the projection display device. focal length, and then adjust the virtual imaging distance. Specifically, in this embodiment, the micro-actuating structure A1 is any one of electromagnetic, MEMS, piezoelectric material, and memory metal actuable micro-structures, and the image source DS includes a processing chip. The chip is signal-connected to the micro-actuating structure A1 to control the micro-actuating structure A1 to adjust the position of the image source DS or the first lens unit 5 . At the same time, the first lens unit 5 can transmit the light beam generated by the image source DS, and the first lens unit 5 includes at least one lens, and the lens is a collimating lens. In this embodiment, the image source DS and the first lens unit 5 are coaxial. In this embodiment, the central axis of the first optical unit 2 and the central axis of the image generating unit 1 form an included angle of 45°, and the central axis of the second optical unit 3 and the center of the image generating unit 1 The axes form an included angle of 90°, the central axis of the image generating unit 1 and the central axis of the second optical unit 3 perpendicularly intersect with the first optical unit 2, and the central axis of the thermal mirror M1 and the The central axis of the image generating unit 1 forms an included angle of 45°, and the central axis of the lens unit M2 forms an included angle of 45° with the central axis of the light beam emitted by the infrared light source L.

The working principle of the head-mounted display optical system provided in this embodiment is as follows:

Image projection process: the image source DS generates and emits a light beam a carrying image information, which is collimated by the first lens unit 5 and then reaches the thermal mirror M1 , and is transmitted by the thermal mirror M1 to reach the first optical unit 2 . The light beam a is reflected by the first optical unit 2 and reaches the second optical unit 3. The light beam a reflected by the second optical unit 3 returns to the first optical unit 2, and is transmitted through the first optical unit 2 into the user's camera. The field of view, ie the user's eyes 4 .

Eye tracking process: the infrared light source L generates an infrared beam b, which is transmitted to the thermal mirror M1 through the mirror unit M2, reflected to the first optical unit 2 by the thermal mirror M1, and reflected by the first optical unit 2 into the first optical unit 2. The second optical unit 3 is reflected back to the first optical unit 2 through the second optical unit 3 , and finally transmitted through the first optical unit 2 into the user's eye 4 . The infrared light beam b entering the user's eye 4 is reflected back to the first optical unit 2 by the user's eye 4, transmitted through the first optical unit 2 and enters the second optical unit 3, and is reflected by the second optical unit 3 in turn to reach the first optical unit The unit 2 is then reflected to the thermal mirror M1 by the first optical unit 2, and reflected to the mirror unit M2 by the thermal mirror M1, and finally reflected to the image receiving unit C by the mirror unit M2 (in this embodiment, infrared image sensor), the image receiving unit C identifies the gaze point and gaze depth information of the human eye, and feeds back the gaze point and gaze depth information to the processing chip of the image generation unit 1, and the processing chip is based on the received gaze point and The gaze depth information modulates the micro-actuating structure A1, and then adjusts the position of the image source DS or the first lens unit 5, so as to adjust the virtual imaging distance of the projection display device, and make the virtual imaging distance and the distance detected by the eye tracking device. Human eye gaze depth matches.

Please refer to FIG. 1 and FIG. 3, which are another embodiment of the present invention. In this embodiment, the image generating unit 1 includes an image source DS and a second lens unit 6, and the second lens unit 6 is used to transmit all The beam generated by the image source DS and adjust the effective focal length of the projection display device. Specifically, the second lens unit 6 is an adjustable focus collimating lens, which is composed of at least one lens, and the image source DS includes a processing chip, and the processing chip is signal-connected to the adjustable focus collimating lens and then The focus-adjustable collimating lens is controlled to adjust the focal length, and the adjustable-focus collimating lens can specifically adopt the existing technology that can realize the above-mentioned focusing function, such as moving the position of the lens in the lens group or using an electronically adjustable lens. A type of lens that can change its shape to achieve zooming by means of deformation drive, piezoelectric drive, etc. In this embodiment, the image source and the second lens unit 6 are coaxial. In this embodiment, the central axis of the first optical unit 2 and the central axis of the image generating unit 1 form an included angle of 45°, and the central axis of the second optical unit 3 and the center of the image generating unit 1 The axes form an included angle of 90°, the central axis of the image generating unit 1 and the central axis of the second optical unit 3 perpendicularly intersect with the first optical unit 2, and the central axis of the thermal mirror M1 and the The central axis of the image generating unit 1 forms an included angle of 45°, and the central axis of the lens unit M2 and the central axis of the light beam emitted by the infrared light source L form an included angle of 45°.

The working principle of the head-mounted display optical system provided in this embodiment is as follows:

Image projection process: the image source DS generates and emits a light beam a carrying image information, which is collimated by the second lens unit 6 and then reaches the thermal mirror M1 , and is transmitted through the thermal mirror M1 to reach the first optical unit 2 . The first optical unit 2 reflects the light beam a to the second optical unit 3, and the light beam a reflected by the second optical unit 3 returns to the first optical unit 2, and enters the user's field of vision after being transmitted by the first optical unit 2, that is, the user eyes 4.

Eye tracking process: the infrared light source L generates an infrared beam b, which is transmitted to the thermal mirror M1 through the mirror unit M2, reflected to the first optical unit 2 by the thermal mirror M1, and reflected by the first optical unit 2 into the first optical unit 2. The second optical unit 3 is reflected back to the first optical unit 2 through the second optical unit 3 , and finally transmitted through the first optical unit 2 into the user's eye 4 . The infrared light beam b entering the user's eye 4 is reflected back to the first optical unit 2 by the user's eye 4 , transmitted through the first optical unit 2 into the second optical unit 3 , and passed through the second optical unit 3 and the first optical unit 2 in turn Reflected to the thermal mirror M1, and reflected to the mirror unit M2 through the thermal mirror M1, and finally reflected to the image receiving unit C (the infrared image sensor is used in this embodiment) through the mirror unit M2, and the image receiving unit C recognizes the person. The gaze point and gaze depth information of the eyes are fed back to the processing chip of the image generation unit 1, and the processing chip modulates the focal length of the adjustable focus collimating lens according to the received information, thereby adjusting the projection display The virtual imaging distance of the device, and match the virtual imaging distance with the gaze depth of the human eye detected by the eye tracking device.

The present invention also provides a head-mounted display device including the above-mentioned head-mounted display optical system.

To sum up, the beneficial effects of the present invention are: by understanding the gaze point, gaze depth and other information of the human eye, the virtual imaging distance is adjusted so that the virtual imaging distance matches the gaze depth of the human eye, so as to achieve a better immersive experience and Human-computer interaction experience. The eye tracking optical system is optically integrated with the projection display to reduce the volume of the display module, which is conducive to the miniaturization and thinning of the augmented reality display device.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. Inside.

Claims (10)

1. A head-mounted display optical system comprising a projection display device and an eye tracking device,

the eye movement tracking device is used for identifying the fixation point and the fixation depth information of the human eyes and feeding back the fixation point and the fixation depth information to the projection display device;

the projection display device is used for virtual imaging and adjusting the virtual imaging distance according to the gaze point and gaze depth information fed back by the eye tracking device, so that the virtual imaging distance is matched with the gaze depth of the human eyes detected by the eye tracking device.

2. The head-mounted display optical system according to claim 1, wherein the projection display device comprises: the image generation unit, the first optical unit, the second optical unit;

the image generating unit is used for generating and emitting light beams carrying image information;

the first optical unit is used for reflecting the light beam emitted by the image generating unit to the second optical unit, the second optical unit is used for reflecting the light beam reflected by the first optical unit, and the light beam reflected by the second optical unit returns to the first optical unit and enters the eyes of the user after being transmitted by the first optical unit.

3. The head-mounted display optical system according to claim 2, wherein the eye tracking device comprises: the infrared light source, the transflective mirror unit, the heat reflecting mirror and the image receiving unit;

the infrared light source is used for generating an infrared light beam, the infrared light beam is transmitted to the heat reflecting mirror through the transflective mirror unit, reflected to the first optical unit through the heat reflecting mirror, reflected to the second optical unit through the first optical unit, reflected to the first optical unit through the second optical unit, and transmitted to the eyes of the user through the first optical unit;

infrared light beams entering the eyes of the user are reflected back to the first optical unit by the eyes of the user, transmitted into the second optical unit by the first optical unit, reflected to the heat reflector by the second optical unit and the first optical unit in sequence, reflected to the transflective mirror unit by the heat reflector, and finally reflected to the image receiving unit by the transflective mirror unit;

the image receiving unit identifies the fixation point and the fixation depth information of the human eyes according to the received infrared beams reflected by the eyes of the user, and feeds the fixation point and the fixation depth information back to the image generating unit.

4. The head-mounted display optical system according to claim 3,

the image generation unit emits a light beam carrying image information, and specifically enters the first optical unit after being transmitted by the heat reflecting mirror;

the image generating unit is further configured to adjust a virtual imaging distance according to the gaze point and gaze depth information fed back by the image receiving unit, so that the virtual imaging distance matches with the eye gaze depth detected by the eye tracking device.

5. The head-mounted display optical system according to any one of claims 2 to 4, wherein the image generation unit comprises an image source, a micro-actuation structure and a first lens unit, the micro-actuation structure is used for adjusting the position of the image source or the first lens unit so as to modulate the focal depth of a projection image plane or adjust the effective focal length of the projection display device; or the like, or, alternatively,

the image generating unit comprises an image source and a second lens unit, and the second lens unit is used for transmitting light beams generated by the image source and adjusting the effective focal length of the projection display device.

6. The head-mounted display optical system of claim 5, wherein the second lens unit is a focus-adjustable lens unit consisting of at least one piece of focus-adjustable collimating lens, and the image source is coaxial with the second lens unit.

7. The head-mounted display optical system according to any one of claims 2 to 4, wherein a surface of the first optical unit is provided with a transflective film having a ratio of transmittance to reflectance of 1: 1;

the surface of the second optical unit is provided with a transflective film, the ratio of the transmittance to the reflectance of the transflective film is 1:1, and the surface type of the second optical unit is any one of a spherical surface, an aspheric surface and a free-form surface;

the central axis of the first optical unit and the central axis of the image generating unit of the projection display device form an included angle of 45 degrees;

the central axis of the second optical unit forms an included angle of 90 degrees with the central axis of the image generating unit.

8. The head-mounted display optical system according to claim 7, wherein a central axis of the image generation unit and a central axis of the second optical unit perpendicularly intersect with the first optical unit.

9. The head-mounted display optical system according to any one of claims 3 to 4, wherein the transflective mirror unit is a half-mirror, and the transflective mirror unit is coated with a filter film and responds only to infrared light beams;

the image receiving unit is an infrared image sensor;

the central axis of the heat reflecting mirror and the central axis of the image generating unit of the projection display device form an included angle of 45 degrees;

and the central axis of the transflective mirror unit and the central axis of the infrared light source emission beam form an included angle of 45 degrees.

10. A head-mounted display apparatus comprising the head-mounted display optical system according to any one of claims 1 to 9.

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