Handheld display device

Abstract

The utility model provides handheld display equipment, and relates to the technical field of display, the handheld display equipment comprises a support and a projection light machine and a waveguide unit which are arranged on the support, the waveguide unit is located on the light emitting side of the projection light machine, and the waveguide unit is provided with a coupling-in area and a coupling-out area; a part of light emitted by the projection light machine passes through the coupling-in area of the waveguide unit to form first light, the first light is transmitted through the waveguide unit and then is emitted to the eyeball imaging area from the coupling-out area, a high-quality virtual image is formed, and the design can ensure the definition and fidelity of the virtual image; meanwhile, the other part of light emitted by the projection light machine penetrates through the waveguide unit to form second light, the second light can penetrate through the waveguide unit to form a projection image observable by the eyeball, the design can achieve the projection function, normal imaging of the waveguide unit can be kept, and therefore the overall performance of the handheld display device is improved; and the requirements of various use scenes such as family sharing are met.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a handheld display device. Background Art

[0002] With the development of science and technology, smart terminal devices such as mobile phones and tablets have occupied an increasingly high proportion in people's lives. In the existing technology, the plane of the smart terminal device is the main body of the screen display, and the viewing distance is very limited. Long-term use can easily cause visual fatigue. Based on AR display technology, the screen image can be projected to a farther position, even to infinity. Therefore, applying AR display technology to smart terminal devices such as mobile phones and tablets will be a major solution to protect eyes.

[0003] However, AR display technology is limited by its FOV, and only a small eye-box can see the complete picture. Therefore, only the user can observe the virtual image displayed by the smart terminal device. In actual use, there are some usage scenarios that require multiple people to interact together, or the user wants to share the virtual image displayed by the terminal device with others. Currently, smart terminal devices based on AR display technology can only share by passing it one by one, which is a single and very inconvenient method. Utility Model Content

[0004] The purpose of the present application is to provide a handheld display device to address the deficiencies in the above-mentioned prior art, which has a projection function without affecting the imaging of the waveguide unit, meets the needs of various usage scenarios such as family sharing, and solves the problem in the prior art that users want to share the virtual image displayed by the terminal device with others. The inconvenience of operation.

[0005] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0006] An embodiment of the present application provides a handheld display device, including a bracket and a projection optical machine, a waveguide unit and a focusing unit arranged on the bracket, the waveguide unit and the focusing unit are located on the light output side of the projection optical machine, the waveguide unit has a coupling-in area and a coupling-out area, the light emitted by the projection optical machine passes through the coupling-in area to form a first light coupled into the waveguide unit and a second light transmitted through the waveguide unit, the first light is transmitted through the waveguide unit and then emitted from the coupling-out area to the eyeball for imaging, the second light is transmitted through the waveguide unit and then focused by the focusing unit to form a projection image observable by the eyeball.

[0007] Optionally, the bracket is a shell with a cavity, the projection optical machine and the waveguide unit are arranged in the cavity, and a display opening and a light hole are arranged in the shell. The display opening is opposite to the coupling-out area, and the light hole is opposite to the light outlet of the projection optical machine. The first light is emitted through the display opening to the eyeball for imaging, and the second light is emitted through the light hole to form a projection image.

[0008] Optionally, the shell includes a first shell and a second shell that are matched to each other to form a cavity, the light outlet of the projection light engine is close to the first shell, and the display opening and the light hole are both located in the first shell.

[0009] Optionally, the shell includes a first shell and a second shell that are matched to each other to form a cavity, the light outlet of the projection light engine is close to the second shell, the display opening is located in the first shell, and the light hole is located in the second shell.

[0010] Optionally, the focusing unit is arranged in the cavity along the optical path of the projection light machine, and the focusing unit is located on the side of the waveguide unit away from the projection light machine, and the second light is focused by the focusing unit after transmitting the waveguide unit to form a projection image.

[0011] Optionally, an adjustable aperture is provided in the light hole to control the amount of light passing through the light hole.

[0012] Optionally, a control switch is provided in the light-through hole, and the control switch is used to control the opening area of ​​the light-through hole.

[0013] Optionally, the handheld display device further comprises a photoelectric sensor for detecting the brightness of ambient light, the photoelectric sensor is electrically connected to the control switch, and the control switch controls the opening area of ​​the light hole according to an optical signal acquired by the photoelectric sensor.

[0014] Optionally, the size of the light hole is greater than or equal to the size of the light outlet of the projection light engine.

[0015] Optionally, the projection optical machine includes an image source device and a first lens, and the light emitted by the image source device is incident on the waveguide unit through the first lens.

[0016] The beneficial effects of this application include:

[0017] The present application provides a handheld display device, including a bracket and a projection optical machine, a waveguide unit and a focusing unit arranged on the bracket, wherein the waveguide unit and the focusing unit are located on the light-emitting side of the projection optical machine, and the waveguide unit has an incoupling area and an outcoupling area. The light emitted by the projection optical machine forms a first light coupled into the waveguide unit through the incoupling area and a second light transmitted through the waveguide unit. The first light is transmitted through the waveguide unit and then emitted from the outcoupling area to the eyeball for imaging, and the second light is focused by the focusing unit after transmitting the waveguide unit to form a projection image observable by the eyeball. The present application arranges the projection optical machine and the waveguide unit on the bracket and utilizes the stable structure of the bracket to provide reliable support for the projection optical machine and the waveguide unit, thereby ensuring the stability and safety of the projection optical machine and the waveguide unit during use, and making it suitable for various environments and occasions. The projection optical machine, waveguide unit and focusing unit are key components and are cleverly arranged on the bracket. The waveguide unit and focusing unit are arranged on the light output side of the projection optical machine, so that a part of the light emitted by the projection optical machine passes through the coupling-in area of ​​the waveguide unit to form a first light. After the first light is transmitted by the waveguide unit, it is emitted from the coupling-out area to the eye imaging area to form a high-quality virtual image. This design ensures the clarity and realism of the virtual image. At the same time, another part of the light emitted by the projection optical machine transmits the waveguide unit to form a second light. After the second light can transmit the waveguide unit, it is focused by the focusing unit to form a projection image observable by the eye. This design can not only realize the projection function, but also maintain the normal imaging of the waveguide unit, thereby improving the overall performance of the handheld display device and meeting the needs of various usage scenarios such as family sharing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 One of the structural schematic diagrams of a handheld display device provided in an embodiment of the present application;

[0020] Figure 2 This is a second structural schematic diagram of a handheld display device provided in an embodiment of the present application.

[0021] Icon: 100 - bracket; 110 - first shell; 111 - display opening; 120 - second shell; 121 - light hole; 200 - projection optical machine; 201 - virtual image; 202 - projected image; 310 - outcoupling area; 400 - focusing unit. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. It should be noted that, in the absence of conflict, the various features in the embodiments of the present application can be combined with each other, and the combined embodiments are still within the scope of protection of the present application.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] An embodiment of the present application provides a handheld display device, including a bracket 100 and a projection light machine 200, a waveguide unit and a focusing unit 400 arranged on the bracket 100. The waveguide unit and the focusing unit 400 are located on the light output side of the projection light machine 200. The waveguide unit has a coupling-in area and a coupling-out area 310. The light emitted by the projection light machine 200 forms a first light coupled into the waveguide unit through the coupling-in area and a second light transmitted through the waveguide unit. The first light is transmitted through the waveguide unit and then emitted from the coupling-out area 310 to the eyeball for imaging. The second light is focused by the focusing unit 400 after transmitting the waveguide unit to form a projection image 202 observable by the eyeball.

[0029] like Figure 1 or Figure 2 As shown, by arranging the projection light engine 200 and the waveguide unit on the bracket 100 and utilizing the stable structure of the bracket 100, reliable support is provided for the projection light engine 200 and the waveguide unit, ensuring the stability and safety of the projection light engine 200 and the waveguide unit during use, making them suitable for various environments and occasions. The projection optical machine 200, the waveguide unit and the focusing unit 400 are key components and are cleverly arranged on the bracket 100. The waveguide unit and the focusing unit 400 are arranged on the light-emitting side of the projection optical machine 200, so that a part of the light emitted by the projection optical machine 200 passes through the coupling-in area of ​​the waveguide unit to form a first light. After the first light is transmitted by the waveguide unit, it is emitted from the coupling-out area 310 to the eye imaging area to form a high-quality virtual image 201. This design ensures the clarity and realism of the virtual image 201. At the same time, another part of the light emitted by the projection optical machine 200 transmits the waveguide unit to form a second light. After the second light can transmit the waveguide unit, it is focused by the focusing unit 400 to form a projection image 202 observable by the eye. This design can not only realize the projection function, but also maintain the normal imaging of the waveguide unit, thereby improving the overall performance of the handheld display device and meeting the needs of various usage scenarios such as family sharing.

[0030] It should be noted that the handheld display device in this embodiment can be a tablet computer, a mobile phone, a PDA or other handheld display devices; the focusing unit 400 can be a lens or a lens array, a reflector, a prism, or any combination of the above elements.

[0031] Optionally, the bracket 100 is a shell with a cavity, the projection optical machine 200 and the waveguide unit are arranged in the cavity, and a display opening 111 and a light hole 121 are arranged in the shell. The display opening 111 is opposite to the outcoupling area 310, and the light hole 121 is opposite to the light outlet of the projection optical machine 200. The first light is emitted through the display opening 111 to the eyeball for imaging, and the second light is emitted through the light hole 121 to form a projection image 202.

[0032] Specifically, Figure 1 or Figure 2 As shown, the bracket 100 is constructed as a shell with a cavity, and the projection optical machine 200 and the waveguide unit are cleverly placed inside the cavity, realizing a compact and effective component layout. The shell itself is provided with a display opening 111 and a light hole 121. The display opening 111 and the light hole 121 can be circular or rectangular or other closed shapes. These two key design elements play an important role in the overall structure. First, the display opening 111 is precisely set on the shell, facing the coupling area 310 of the waveguide unit. This design ensures that the first light is emitted through the display opening 111 and directly transmitted to the eyeball imaging area to form a virtual image 201, ensuring the clarity of the virtual image 201 and the high-quality projection effect. The advantage of this structure is that it directly guides the light, reduces the loss of light, and improves the brightness and sharpness of the virtual image 201; secondly, the light hole 121 is located on the shell, directly opposite to the light outlet of the projection optical machine 200. Through this light hole 121, the second light can be smoothly emitted to form a projection image 202 observable by the eye. This design enables the device to realize the projection function without affecting the imaging of the waveguide unit, thereby meeting the needs of multiple people to interact and share images.

[0033] In general, through precise structural layout and the coordinated action of optical elements, efficient interaction between the projection optical machine 200 and the waveguide unit is achieved, ensuring the smooth operation of the handheld display device, so that the operator can enjoy clear and realistic virtual images 201 without worrying about light loss and image blur, and can also meet the needs of multiple people to interact and share images through the projected image 202, thereby improving the convenience of use and user experience.

[0034] Optionally, the housing includes a first housing 110 and a second housing 120 that are matched to form a cavity, the light outlet of the projection light engine 200 is close to the first housing 110 , and the display opening 111 and the light hole 121 are both located in the first housing 110 .

[0035] Specifically, Figure 1As shown, the bracket 100 uses two shells that are matched to form a cavity, namely, a first shell 110 and a second shell 120. The light outlet of the projection optical machine 200 is close to the first shell 110, while the display opening 111 and the light hole 121 are cleverly located on the first shell 110. At this time, the waveguide unit is located between the projection optical machine 200 and the first shell 110. In this way, the projection image 202 formed after the waveguide unit is transmitted and the virtual image 201 formed by the coupling region are projected to the opposite sides of the user, that is, the projection image 202 is located behind the user. In actual use, the user can directly view the virtual image 201 through the display opening 111. When there is a need to share content with more than one family member, the user can conveniently project the display content to the external wall or projection screen through the light hole 121, so that other viewers can clearly see the projection image 202. This layout shows strong applicability in scenarios such as multi-person interaction, family sharing, and educational demonstrations.

[0036] In general, this ingeniously structured handheld display device, through the combination of the shell, the design of the light hole 121, and the reasonable projection layout, allows the projection image 202 and the virtual image 201 to be displayed simultaneously without interfering with each other, thereby achieving independent projection of different images, so that users can more flexibly display and share the virtual image 201 when using it, meeting the needs of users in various usage scenarios, and providing convenience and user-friendliness for the actual operation of the handheld display device.

[0037] Optionally, the shell includes a first shell 110 and a second shell 120 that are matched to form a cavity, the light outlet of the projection light engine 200 is close to the second shell 120 , the display opening 111 is located in the first shell 110 , and the light hole 121 is located in the second shell 120 .

[0038] Specifically, Figure 2As shown, the housing includes a first housing 110 and a second housing 120 that are matched to form a cavity, wherein the light outlet of the projection optical machine 200 is close to the second housing 120, the display opening 111 is located in the first housing 110, and the light hole 121 is cleverly arranged on the second housing 120. At this time, the waveguide unit is located between the projection optical machine 200 and the second housing 120. This structural design enables the virtual image 201 and the projected image 202 to be located on the same side of the user, and the user can watch the virtual image 201 and the projected image 202 at the same time without switching the viewing angle, providing the user with a more convenient observation experience, which is particularly useful in situations where sharing and explanation are required, such as conference scenes. The user can intuitively observe the images seen by other sharees, and achieve a more immediate and interactive communication experience. This design not only facilitates the user to observe the virtual image 201 and the projected image 202, but also provides the user with the possibility of timely feedback and adjustment. The user can quickly adjust the angle or display content of the handheld display device according to the information feedback of the projected image 202 to meet different needs. This instant interactive function provides users with greater flexibility and control during sharing and presentation.

[0039] Overall, the innovation of this structure and layout design lies in creating a more convenient and efficient communication environment for users, which not only meets the needs of multi-person sharing, but also provides a higher level of interactivity and real-time feedback functions, which makes the handheld display device more comprehensive and suitable for a variety of different usage scenarios, bringing users a richer and more convenient experience.

[0040] Optionally, the focusing unit 400 is disposed in the cavity along the optical path of the projection optical engine 200 , and the focusing unit 400 is located on a side of the waveguide unit away from the projection optical engine 200 , and the second light is emitted through the focusing unit 400 after transmitting the waveguide unit to form a projection image 202 .

[0041] Specifically, Figure 1 or Figure 2 As shown, the focusing unit 400 is cleverly arranged in the cavity along the optical path of the projection optical machine 200, and is located on the side of the waveguide unit away from the projection optical machine 200. This design not only reasonably arranges the components, but also provides a richer level for the implementation process of the entire device. The second light is emitted through the focusing unit 400 after transmitting the waveguide unit to form a clear projection image 202. At the same time, the existence of the focusing unit 400 can also flexibly adjust the focal length of the projection image 202 according to actual needs, ensuring that a clear and comfortable visual effect can be obtained at different distances and viewing environments, so as to meet the needs of different audiences and usage scenarios, improve the overall image quality of the handheld display device, and enhance the applicability and user experience of the handheld display device.

[0042] It should be noted that the focus unit 400 is usually movable and its position can be adjusted in the cavity. By moving the focus unit 400, the position of the convergence point when the light passes through the focus unit 400 can be changed, thereby adjusting the clarity of the projected image 202. Some focus units 400 may be equipped with special zoom devices, which can adjust the position of the focus unit 400 manually or electrically to achieve a change in focal length. Users can adjust the focal length as needed to adapt to different viewing distances or environments; in some handheld display devices, the adjustment of the focal length can also be controlled by software. Users can use the interface on the device or control devices such as remote controls to adjust the position of the focus unit 400 through software to achieve a change in focal length; some handheld display devices may be equipped with automatic focus technology. Through devices such as sensors or cameras, the system can monitor the clarity of the projected image 202 in real time and automatically adjust the position of the focus unit 400 to maintain the best focal length state without manual intervention by the user.

[0043] Optionally, a control switch is provided in the light-through hole 121 , and the control switch is used to control the opening area of ​​the light-through hole 121 .

[0044] Specifically, the control switch is cleverly integrated in the light-through hole 121, ensuring its accurate position in the cavity and coordinated connection with other components. This structural design not only provides a compact appearance, but also ensures that the user can easily operate the control switch. The control switch can be controlled in a variety of ways, including mechanical switches, inductive switches, electric controls, remote controls or other control switches, and even any combination of the above switch methods. This diverse control method provides users with more choices to flexibly operate the device according to personal preferences and usage scenarios. The user can adjust the opening area of ​​the light hole 121 by controlling the switch. When the user does not need to share the display screen with others, the opening area can be adjusted to zero by controlling the switch to prevent the external transmission of the projected image 202 and protect the user's privacy. When sharing is needed, the user can choose to fully or partially open the light hole 121 by controlling the switch, that is, the opening area is less than or equal to the area of ​​the light hole 121 and is not zero, so that other people can watch the display screen at the same time, and adjust the light transmission by controlling the switch to adjust the brightness of the projected image 202, thereby ensuring the best viewing effect under various lighting conditions and ensuring that the brightness of the virtual image 201 is not affected.

[0045] Optionally, an adjustable aperture is provided in the light hole 121 to control the amount of light passing through the light hole 121 .

[0046] Specifically, in the structure of the handheld display device, an adjustable iris is integrated in the light hole 121, which works in coordination with other optical elements. This structural design ensures the accurate position of the adjustable iris in the cavity, and is coordinated with the components such as the projection optical machine 200, the waveguide unit and the focusing unit 400. The variable iris controls the amount of light passing through the light hole 121 by adjusting the aperture size, which is specifically achieved by changing the position of the movable wing inside the optical cable. The position of these movable wings can be fine-tuned by knobs, electric mechanical devices or other means, which also include adjusting the position of the movable wings by control buttons, sliding bars or other manual or automatic control mechanisms. The mechanical device should provide high accuracy and controllability. When the movable wings are close together, the effective aperture is reduced, preventing more light from passing through, that is, reducing the amount of light passing through the light hole 121; conversely, when the movable wings are opened, the effective aperture is increased, allowing more light to pass through, that is, increasing the amount of light passing through the light hole 121.

[0047] In actual use, by adjusting the aperture of the adjustable iris, the user can customize the amount of light passing through the light hole 121 according to the current use environment and the needs of the audience, thereby adjusting the brightness level of the projected image 202 to ensure the best viewing experience under different lighting conditions, further improving the performance and adaptability of the handheld display device. For example, in a dark theater environment or a brightly lit living room, through the application of the adjustable iris, the user can flexibly adjust the brightness of the projected image 202 according to the changes in the ambient brightness to ensure the comfort and clarity of viewing, while not affecting the brightness of the virtual image 201, making the entire projection process more intelligent and user-friendly.

[0048] Optionally, the handheld display device further includes a photoelectric sensor for detecting the brightness of ambient light, the photoelectric sensor is electrically connected to the control switch, and the control switch controls the opening area of ​​the light hole 121 according to an optical signal obtained by the photoelectric sensor.

[0049] Specifically, the digital controlled liquid crystal switch can be used as a control switch, and the photoelectric sensor is electrically connected to the digital controlled liquid crystal switch. The photoelectric sensor monitors the brightness change of the external environment in real time, and transmits this information to the digital controlled liquid crystal switch. The digital controlled liquid crystal switch makes real-time adjustments through a negative feedback network according to the optical signal obtained by the photoelectric sensor to control the opening area of ​​the light hole 121. This real-time negative feedback mechanism enables the digital controlled liquid crystal switch to respond quickly to light changes and automatically adjust the opening area of ​​the light hole 121 to maintain the appropriate brightness of the projected image 202.

[0050] During actual use, when the external environment light is bright, the digitally controlled liquid crystal switch automatically adjusts the arrangement of the liquid crystal molecules according to the information of the photoelectric sensor, so that the opening area of ​​the light hole 121 is increased, and the transmittance of light is improved, which further increases the brightness of the projected image 202, ensuring that a clear image can be obtained even in a bright environment; similarly, in a darker environment, through the negative feedback network of the photoelectric sensor, the digitally controlled liquid crystal switch automatically reduces the opening area of ​​the light hole 121 to reduce the transmittance of light, thereby reducing the brightness of the projected image 202, avoiding glare, and improving the overall user experience.

[0051] Optionally, the size of the light hole 121 is greater than or equal to the size of the light outlet of the projection optical engine 200 .

[0052] Specifically, Figure 1 or Figure 2 As shown, the size of the light hole 121 is greater than or equal to the size of the light outlet of the projection optical engine 200. This design has certain rationality and advantages in terms of structure and optics. First, this design choice ensures that the size of the light hole 121 is sufficient to accommodate the light generated by the projection optical engine 200. By ensuring that the light hole 121 is spacious enough, the light can be prevented from being obstructed or cut off during the transmission process, thereby maximizing the transmission efficiency of the light, which is crucial for simplifying the optical structure of the device and ensuring sufficient light entering; secondly, the size of the light hole 121 is greater than or equal to the light outlet size of the projection optical engine 200, which means that the projected image 202 will not be cut off or distorted when passing through the light hole 121, which helps to maintain the integrity and clarity of the projected image 202 and ensure that the audience can obtain a high-quality visual experience. At the same time, a sufficiently large size of the light hole 121 also helps to evenly distribute the light, avoid over-focusing or defocusing, and improve the quality of the projected image 202; in addition, the user experience is also improved. Since the size of the light hole 121 is large enough, the projection light can fully cover a wider projection range and is suitable for screens or projection surfaces of different sizes. This ensures a more flexible usage scenario, and users can choose the appropriate projection distance and screen size according to their needs.

[0053] Optionally, the projection optical engine 200 includes an image source device and a first lens, and the light emitted by the image source device is incident on the waveguide unit through the first lens.

[0054] Specifically, the projection optical machine 200, as the core component of the handheld display device, is composed of an image source device and a first lens, and its design is related to the image quality and perception ultimately presented to the user. First, the image source device acts as the visual engine of the projection optical machine 200, responsible for converting digital image information into visible light. The image source device can use technologies such as LCD (liquid crystal display), LCOS (liquid crystal reflective display), DLP (digital light processing), OLED (organic light emitting diode) or Micro-LED to provide excellent flexibility and performance for handheld display devices; secondly, the first lens, as a key optical element in the projection optical machine 200, plays a role in focusing and guiding light. The light emitted by the image source device is incident on the waveguide unit via the first lens, ensuring the clarity of the projected image 202 and the accuracy of the focal length adjustment.

[0055] The uniqueness of this design lies in that it allows different types of image source devices to be selected according to the needs of different application scenarios, so as to achieve the best balance in color, contrast, brightness, etc. This diversity enables handheld display devices to perform well in various environments and uses, providing an excellent visual experience. The innovative design of the Projection Light Engine 200 combines different image source technologies with precision optical components to provide users with a more flexible and high-performance display solution.

[0056] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A handheld display device, characterized in that: The invention comprises a support (100), a projection light machine (200), a waveguide unit and a focusing unit (400) arranged on the support (100); the waveguide unit and the focusing unit (400) are located on the light output side of the projection light machine (200); the waveguide unit has an incoupling area and an outcoupling area (310); the light emitted by the projection light machine (200) passes through the incoupling area to form a first light coupled into the waveguide unit and a second light transmitted through the waveguide unit; the first light is transmitted through the waveguide unit and then emitted from the outcoupling area (310) to form an eyeball image; the second light is transmitted through the waveguide unit and then focused by the focusing unit (400) to form a projection image (202) observable by the eyeball.

2. The handheld display device according to claim 1, characterized in that: The support (100) is a shell having a cavity, the projection optical machine (200) and the waveguide unit are arranged in the cavity, and a display opening (111) and a light through hole (121) are arranged in the shell, the display opening (111) is directly opposite to the outcoupling region (310), and the light through hole (121) is directly opposite to the light outlet of the projection optical machine (200), the first light is emitted through the display opening (111) to form an eyeball image, and the second light is emitted through the light through hole (121) to form the projected image (202).

3. The handheld display device according to claim 2, characterized in that: The shell comprises a first shell (110) and a second shell (120) which are matched to each other to form the cavity, the light outlet of the projection light engine (200) is close to the first shell (110), and the display opening (111) and the light through hole (121) are both located in the first shell (110).

4. The handheld display device according to claim 2, characterized in that: The shell comprises a first shell (110) and a second shell (120) which are matched with each other to form the cavity, the light outlet of the projection light engine (200) is close to the second shell (120), the display opening (111) is located in the first shell (110), and the light hole (121) is located in the second shell (120).

5. The handheld display device according to any one of claims 2 to 4, characterized in that: The focusing unit (400) is arranged in the cavity along the optical path of the projection light machine (200), and the focusing unit (400) is located on a side of the waveguide unit away from the projection light machine (200), and the second light is focused by the focusing unit (400) after transmitting through the waveguide unit to form the projection image (202).

6. The handheld display device according to any one of claims 2 to 4, characterized in that: An adjustable diaphragm is arranged in the light-through hole (121) to control the amount of light passing through the light-through hole (121).

7. The handheld display device according to any one of claims 2 to 4, characterized in that: A control switch is arranged in the light-through hole (121), and the control switch is used to control the opening area of ​​the light-through hole (121).

8. The handheld display device according to claim 7, characterized in that: The handheld display device also includes a photoelectric sensor for detecting the brightness of ambient light, the photoelectric sensor is electrically connected to the control switch, and the control switch controls the opening area of ​​the light hole (121) according to the optical signal obtained by the photoelectric sensor.

9. The handheld display device according to any one of claims 2 to 4, characterized in that: The size of the light-through hole (121) is greater than or equal to the size of the light outlet of the projection optical machine (200).

10. The handheld display device according to any one of claims 1 to 4, characterized in that: The projection optical machine (200) comprises an image source device and a first lens, and the light emitted by the image source device is incident on the waveguide unit via the first lens.

Images