Laser projection device and mobile terminal equipment

Abstract

The invention relates to the technical field of face recognition, in particular to a laser projection device and mobile terminal equipment, and the laser projection device comprises a laser, a collimating mirror, a reflecting prism and a light guide column; the laser emits a light beam in the direction parallel to a display screen of the mobile terminal device, the light beam penetrates through the collimating mirror and enters the reflecting prism, the light beam is reflected by the reflecting prism by 90 degrees and then penetrates through the light guide column, and the light beam is emitted out of a non-display area of the display screen in the direction perpendicular to the display screen. According to the invention, the reduction of the screen-to-body ratio can be avoided, the interference of the laser on the display effect of the display screen is prevented, and the thinning design of the mobile terminal equipment is facilitated.

Description

Technical Field

[0001] The present application relates to the field of facial recognition technology, and in particular to a laser projection device and a mobile terminal device. Background Art

[0002] Face ID is an efficient way to unlock a mobile phone. It can recognize the depth profile of a face through structured light or TOF, and realize fast and accurate 3D face recognition. At present, most mobile terminal devices realize facial recognition through a "bangs" method similar to the iPhone or a hole in the display screen. This will form a black area on the display screen where no content can be displayed, thereby reducing the screen-to-body ratio. With the development of technology, another way to achieve this is to design a low-pixel area in the OLED of the display screen and arrange a laser projection module under the low-pixel area. Although this method can avoid causing black areas on the display screen, it will affect the display effect of the display screen to a certain extent. In addition, due to the arrangement of the laser projection module under the display screen, the thickness of mobile terminal devices such as mobile phones increases, which is not conducive to reducing the thickness of the device. Summary of the invention

[0003] The purpose of the present application is to provide a laser projection device and a mobile terminal device, which can not only avoid reducing the screen-to-body ratio and prevent the laser from interfering with the display effect of the display screen, but also facilitate the thinning design of the mobile terminal device.

[0004] The embodiment of the present application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a laser projection device, which is configured on a mobile terminal device; the laser projection device includes a laser, a collimating lens, a reflecting prism and a light guide column; the laser emits a light beam in a direction parallel to the display screen of the mobile terminal device, the light beam transmits the collimating lens and enters the reflecting prism, is reflected by the reflecting prism at 90°, transmits the light guide column, and is emitted from the non-display area of ​​the display screen in a direction perpendicular to the display screen.

[0006] As an optional implementation, the laser is close to a backlight side of the display screen; and the projection of the laser on the display screen falls into a display area of ​​the display screen.

[0007] As an optional embodiment, the light guide column and the reflective prism are integrally formed; a diffusion element is attached to one end of the light guide column away from the reflective prism, the surface of the diffusion element has a microstructure, and the diffusion element is used to scatter the light beam and form a preset illumination field.

[0008] As an optional implementation, the mobile terminal device includes a frame structure, which is arranged around the circumference of the display screen; there is a gap between the frame structure and the display screen; and the light beam is emitted from the gap.

[0009] As an optional implementation, one end of the light guide column away from the reflective prism is embedded in the gap, so that the light emitting surface of the light guide column is close to the outer surface of the display screen.

[0010] As an optional implementation, a glass cover plate is embedded in the gap, and a surface of the glass cover plate on a side facing away from the light guide column is flush with an outer surface of the display screen.

[0011] As an optional implementation, the width of the slit is less than 1.5 mm.

[0012] As an optional embodiment, the collimating mirror has a first cylindrical surface and a second cylindrical surface; the first cylindrical surface is close to the laser and is used for collimation in a first direction; the second cylindrical surface is close to the light guide column and is used for collimation in a second direction; the first direction intersects the second direction perpendicularly.

[0013] As an optional implementation, the laser projection device further comprises a PCB board, the PCB board is provided with a ceramic heat dissipation structure, and the laser is mounted on the surface of the ceramic heat dissipation structure.

[0014] In a second aspect, an embodiment of the present application provides a mobile terminal device, including a frame structure, a display screen, and the above-mentioned laser projection device; the light beam emitted by the laser projection device is emitted from the non-display area of ​​the display screen in a direction perpendicular to the display screen.

[0015] The beneficial effects of the embodiments of the present application include:

[0016] The embodiment of the present application provides a laser projection device, which is configured in a mobile terminal device; the laser projection device includes a laser, a collimator, a reflective prism, and a light guide column; the laser of the embodiment of the present application emits a light beam in a direction parallel to the display screen of the mobile terminal device, the light beam transmits the collimator and enters the reflective prism, after being reflected by the reflective prism at 90°, it transmits the light guide column, and exits the non-display area of ​​the display screen in a direction perpendicular to the display screen. The embodiment of the present application reduces the vertical space occupied by the laser projection device, so that the entire laser projection device can be integrated in a smaller space, saving the internal space of the device, and helping to achieve a thin design of the mobile terminal device. In addition, the embodiment of the present application can also avoid reducing the screen-to-body ratio and prevent the laser from interfering with the display effect of the display screen.

[0017] The embodiment of the present application provides a mobile terminal device, including a frame structure, a display screen, and the above-mentioned laser projection device; the light beam emitted by the laser projection device is emitted from the non-display area of ​​the display screen in a direction perpendicular to the display screen. Compared with the prior art, the light beam in the embodiment of the present application is emitted from the non-display area of ​​the display screen, so there is no need to dig a hole in the screen, and the screen-to-body ratio will not be reduced. The embodiment of the present application also does not need to reserve a specific area on the display screen to achieve laser projection, which can prevent the light beam from interfering with the display effect of the display screen. In addition, the embodiment of the present application reduces the vertical space occupied by the laser projection device, so that the entire laser projection device can be integrated in a smaller space, saving the internal space of the device and helping to achieve a thin design of the mobile terminal device. 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 This is one of the structural schematic diagrams of the laser projection device according to an embodiment of the present application;

[0020] Figure 2 This is one of the structural schematic diagrams of the laser projection device according to an embodiment of the present application;

[0021] Figure 3 Schematic diagram of the structure of the collimating mirror of the laser projection device according to the embodiment of the present application.

[0022] icon:

[0023] 101-laser; 102-collimator; 103-light guide column; 104-reflection prism; 105-display screen; 106-frame structure; 107-gap; 108-glass cover plate; 109-first cylindrical surface; 110-second cylindrical surface; 111-diffusion element; 112-PCB board; 113-ceramic heat dissipation structure. DETAILED DESCRIPTION

[0024] 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.

[0025] 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 which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0026] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. 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.

[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] Face ID is an efficient way to unlock a mobile phone. It can recognize the depth profile of a face through structured light or TOF, and realize fast and accurate 3D face recognition. At present, most mobile terminal devices realize facial recognition through a "bangs" method similar to the iPhone or a hole in the display screen. This will form a black area on the display screen where no content can be displayed, thereby reducing the screen-to-body ratio. With the development of technology, another way to achieve this is to design a low-pixel area in the OLED of the display screen and arrange a laser projection module under the low-pixel area. Although this method can avoid causing black areas on the display screen, it will affect the display effect of the display screen to a certain extent. In addition, due to the arrangement of the laser projection module under the display screen, the thickness of mobile terminal devices such as mobile phones increases, which is not conducive to reducing the thickness of the device.

[0029] In order to solve the above technical problems, an embodiment of the present application provides a laser projection device and a mobile terminal device.

[0030] Reference Figure 1As shown, an embodiment of the present application provides a laser projection device, which is configured in a mobile terminal device; the laser projection device includes a laser 101, a collimator 102, a reflective prism 104 and a light guide column 103; the laser 101 emits a light beam in a direction parallel to a display screen 105 of the mobile terminal device, the light beam transmits the collimator 102 and enters the reflective prism 104, is reflected by the reflective prism 104°, transmits the light guide column 103, and is emitted from a non-display area of ​​the display screen 105 in a direction perpendicular to the display screen 105.

[0031] It should be noted that the laser 101 of the embodiment of the present application emits a light beam in a direction parallel to the display screen 105, rather than directly emitting it vertically. The embodiment of the present application reduces the vertical space occupied by the laser projection device, which helps to achieve a thinner design of the device.

[0032] The collimating mirror 102 in the embodiment of the present application is used to collimate the light beam emitted by the laser 101 to ensure that the light beam remains parallel during the transmission process.

[0033] The reflecting prism 104 of the embodiment of the present application is used to reflect the light beam processed by the collimating lens 102 by 90°, so that its direction changes from being parallel to the display screen 105 to being perpendicular to the display screen 105. This design allows the light beam to change direction within a limited space, avoids a complex optical path, and simplifies the overall structure. The compact design of the embodiment of the present application allows the laser projection device to be more easily integrated into a mobile terminal device, improving the overall compactness and aesthetics of the device.

[0034] It should be noted that the light beam in the embodiment of the present application is emitted from the non-display area of ​​the display screen 105 .

[0035] Different from the conventional method of emitting laser light through the opening or low pixel area of ​​the display screen 105, the light beam in the embodiment of the present application is emitted from the non-display area of ​​the display screen 105. The non-display area in the embodiment of the present application is defined as the peripheral area surrounding the display screen 105. For a specific understanding of the peripheral area of ​​the display screen 105, for example, the frame structure 106 of the mobile phone is arranged around the peripheral area of ​​the display screen 105. The light beam in the embodiment of the present application is emitted from the non-display area on the periphery of the display screen 105 to avoid directly penetrating the display screen 105.

[0036] Specifically, the mobile terminal device includes a frame structure 106 , which is arranged around the circumference of the display screen 105 ; a gap 107 is provided between the frame structure 106 and the display screen 105 ; and the light beam is emitted from the gap 107 .

[0037] It should be noted that the gap 107 of the embodiment of the present application not only provides an exit channel for the laser beam, but also prevents the laser from directly irradiating the display screen 105, thereby reducing the energy loss of the beam and solving the problem of thermal aging of the display screen 105.

[0038] The embodiments of the present application have the following advantages:

[0039] Traditional facial recognition technology usually requires setting a "bangs" or opening on the display screen 105, which will form a black area on the display screen 105 where no content can be displayed, reducing the screen-to-body ratio. However, the embodiment of the present application completely avoids the formation of a black area on the display screen 105 by emitting the laser beam from the non-display area of ​​the display screen 105, that is, the gap 107 between the frame structure 106 and the display screen 105, thereby significantly improving the screen-to-body ratio and enhancing the user's visual experience.

[0040] Although the traditional low-pixel area design can avoid black areas, it will affect the overall display effect of the display screen 105, especially near the low-pixel area, where uneven display or reduced resolution may occur. The embodiment of the present application completely avoids interference with the display area of ​​the display screen 105 by emitting the laser beam from the gap 107 between the frame structure 106 and the display screen 105, ensuring that the display effect of the display screen 105 is not affected, and providing a higher quality visual experience.

[0041] The traditional method of laser penetrating the display screen 105 will result in a large energy absorption loss, because the OLED screen material has a certain absorption effect on the laser. The embodiment of the present application avoids the laser from directly penetrating the display screen 105 by emitting the laser beam from the gap 107 between the frame and the display screen 105, thereby greatly reducing the energy absorption loss and improving the utilization efficiency of the laser. In addition, when the laser penetrates the display screen 105, the pixel structure of the display screen 105 will cause the laser to diffract, thereby affecting the imaging quality of the laser. The embodiment of the present application avoids direct contact between the laser and the display screen 105 by emitting the laser beam from the non-display area, reduces diffraction interference, and ensures the stability of the laser beam and imaging accuracy.

[0042] Long-term exposure of the display screen 105 to a high peak power laser will accelerate the aging of the display screen 105, especially on an OLED screen, where the high energy of the laser may cause degradation of the screen material and shorten the service life of the display screen 105. In the embodiment of the present application, the laser beam is emitted from the gap 107 between the frame structure 106 and the display screen 105, thereby preventing the laser from directly irradiating the display screen 105, thereby effectively preventing the aging of the display screen 105 and extending the service life of the display screen 105.

[0043] In the embodiment of the present application, the laser beam can be accurately guided to the user's face through the combined design of the collimator 102 and the light guide 103, ensuring the stability and parallelism of the beam. This precise beam control helps to improve the accuracy and reliability of facial recognition, especially in complex lighting environments, and can better capture the user's facial features.

[0044] Reference Figure 1 As shown, as an optional implementation, the laser 101 is close to the backlight side of the display screen 105; and the projection of the laser 101 on the display screen 105 falls into the display area of ​​the display screen 105.

[0045] The embodiment of the present application makes the laser 101 close to the display screen 105, reduces the distance between the laser 101 and the display screen 105, reduces the vertical space occupied by the laser, and enables the mobile terminal device to achieve a thin and light design. For mobile terminal devices such as mobile phones, the thinning design is conducive to improving the compactness and aesthetics of the product, thereby enhancing the competitiveness of the product.

[0046] Reference Figure 1 As shown, as an optional embodiment, the light guide column 103 and the reflective prism 104 are integrally formed; a diffusion element 111 is attached to one end of the light guide column 103 away from the reflective prism 104, and the surface of the diffusion element 111 has a microstructure, and the diffusion element 111 is used to scatter the light beam and form a preset illumination field. The microstructure refers to a microlens structure, which can cause the light to refract on the surface of the microlens and change the direction, thereby achieving a preset illumination angle and shape. The diffusion element 111 can be attached to the surface of the light guide column 103 in a variety of ways, such as nanoimprinting or other methods.

[0047] It should be noted that the light guide column 103 and the reflective prism 104 of the embodiment of the present application are integrally formed, which reduces the connection distance between the two, reduces thermal resistance and light loss. The integrated design of the embodiment of the present application not only simplifies the manufacturing process, but also improves the compactness and reliability of the system.

[0048] Reference Figure 2 As shown, as an optional implementation, one end of the light guide column 103 away from the reflective prism 104 is embedded in the gap 107 so that the light emitting surface of the light guide column 103 is close to the outer surface of the display screen 105 .

[0049] One end of the light guide column 103 of the embodiment of the present application is embedded in the gap 107 between the frame and the display screen 105, ensuring that its light emitting surface is close to the outer surface of the display screen 105. The embodiment of the present application not only prevents the light beam from being blocked by the structural member, ensuring the integrity and imaging quality of the laser beam, but also enables the laser beam to be efficiently emitted from the slit of the gap 107, reducing the propagation distance of the light beam in the air, and reducing the risk of energy loss and diffraction interference.

[0050] In the embodiment of the present application, by placing the light-emitting surface of the light-guiding column 103 close to the outer surface of the display screen 105, the light beam can be emitted from the gap 107 with a larger field of view, thereby realizing laser projection with a large field of view. This helps to improve the coverage of facial recognition, ensuring that the laser beam can illuminate more details of the user's face, thereby improving the accuracy and reliability of facial recognition.

[0051] In the embodiment of the present application, the light guide column 103 is embedded in the gap 107 between the frame and the display screen 105, so that the frame structure 106 can be designed to be more compact without leaving extra space for the light guide column 103. This not only saves internal space, but also makes the appearance of the entire device more concise and beautiful. In addition, the need for additional structural parts is reduced, the overall structural design is simplified, and the manufacturing cost is reduced.

[0052] Reference Figure 2 As shown, as an optional implementation, a glass cover plate 108 is embedded in the gap 107 , and the surface of the glass cover plate 108 facing away from the light guide column 103 is flush with the outer surface of the display screen 105 .

[0053] The glass cover plate 108 of the embodiment of the present application is embedded in the gap 107 between the frame structure 106 and the display screen 105, covering the light-emitting surface of the light guide column 103. The design of the glass cover plate 108 effectively protects the light guide column 103 and the laser projection device, avoids the pollution and damage of the laser system by foreign objects such as external dust and moisture, and prolongs the service life of the laser projection device. In addition, the presence of the glass cover plate 108 can also prevent the light guide column 103 and other laser components from being hit and scratched by external objects, reducing the risk of mechanical damage.

[0054] The surface of the glass cover plate 108 on the side away from the light guide column 103 in the embodiment of the present application is flush with the outer surface of the display screen 105, and the user will not feel any protrusions or depressions during use, ensuring the consistency and aesthetics of the device appearance. The overall appearance of the device is more concise and smooth, and the user will not feel any obstruction or discomfort when sliding the screen, which improves the user's operating experience.

[0055] Reference Figure 3 As shown, as an optional embodiment, the collimating mirror 102 has a first cylindrical surface 109 and a second cylindrical surface 110; the first cylindrical surface 109 is close to the laser 101 and is used for collimation in the first direction; the second cylindrical surface 110 is close to the light guide column 103 and is used for collimation in the second direction; the first direction intersects the second direction perpendicularly.

[0056] It should be noted that the first direction is the fast axis direction of the laser 101 , and the second direction is the slow axis direction of the laser 101 .

[0057] The embodiment of the present application performs collimation processing on the fast axis and the slow axis respectively, and the double cylindrical collimator 102 can effectively reduce the divergence angle of the light beam, ensuring that the light beam remains parallel during the transmission process. This not only improves the collimation of the light beam, but also reduces the propagation loss of the light beam in the air, and improves the energy utilization rate of the light beam. The embodiment of the present application ensures that the light beam remains parallel in both directions, avoids the divergence and diffraction of the light beam, and improves the quality and stability of the light beam.

[0058] Reference Figure 1 As shown, as an optional implementation, the laser projection device further includes a PCB board 112 , a ceramic heat dissipation structure 113 is provided on the PCB board 112 , and the laser 101 is mounted on the surface of the ceramic heat dissipation structure 113 .

[0059] The embodiment of the present application can dissipate heat from the laser 101 through the provision of a ceramic heat dissipation structure 113. The ceramic heat dissipation structure 113 has higher thermal conductivity and better insulation performance, and can maintain stable electrical characteristics in a high temperature environment, avoiding the risk of electrical breakdown or short circuit. Since the ceramic heat dissipation structure 113 can effectively conduct the heat generated by the laser 101, the laser 101 can be maintained at a lower operating temperature, avoiding power drop or shortened life due to overheating. This not only improves the stability of the laser 101, but also extends its service life, ensuring the long-term reliable operation of the laser projection device.

[0060] An embodiment of the present application provides a mobile terminal device, including a frame structure 106, a display screen 105 and the above-mentioned laser projection device; the light beam emitted by the laser projection device is emitted from the non-display area of ​​the display screen 105 in a direction perpendicular to the display screen 105.

[0061] The position of the gap 107 on the display screen 105 in the embodiment of the present application can be set by those skilled in the art as needed, and is not particularly limited thereto. For example, the gap 107 is set above the display screen 105. For example, the gap 107 is set on the left or right side of the display screen 105.

[0062] The width of the gap 107 in the embodiment of the present application is less than 1.5 mm. For example, the slit is in the shape of a long strip, the length of the slit is 6 mm, and the width of the slit is 1 mm. The specific shape of the slit can be a long strip, an arc, or any other shape, which can be set by those skilled in the art as needed.

[0063] The mobile terminal device provided in the embodiment of the present application does not need to perform special processing on the display screen 105, ensuring that the display screen 105 has a high screen-to-body ratio and laser transmittance. In addition, since the laser beam does not penetrate the display screen 105, the beam will not have a large energy loss, which is conducive to improving the service life of the display screen 105.

[0064] 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 laser projection device, configured in a mobile terminal device; characterized in that: The laser projection device includes a laser, a collimator, a reflective prism and a light guide column; the laser emits a light beam in a direction parallel to the display screen of the mobile terminal device, the light beam transmits the collimator and enters the reflective prism, is reflected by the reflective prism at 90°, transmits the light guide column, and is emitted from the non-display area of ​​the display screen in a direction perpendicular to the display screen.

2. The laser projection device according to claim 1, characterized in that: The laser is close to a backlight side of the display screen; and the projection of the laser on the display screen falls into a display area of ​​the display screen.

3. The laser projection device according to claim 1, characterized in that: The light guide column and the reflective prism are integrally formed; a diffusion element is attached to one end of the light guide column away from the reflective prism, and a surface of the diffusion element has a microstructure. The diffusion element is used to scatter the light beam and form a preset illumination field.

4. The laser projection device according to claim 1, characterized in that: The mobile terminal device comprises a frame structure, wherein the frame structure is arranged around the circumference of the display screen; a gap is provided between the frame structure and the display screen; and the light beam is emitted from the gap.

5. The laser projection device according to claim 4, characterized in that: One end of the light guide column away from the reflective prism is embedded in the gap, so that the light emitting surface of the light guide column is close to the outer surface of the display screen.

6. The laser projection device according to claim 4, characterized in that: A glass cover plate is embedded in the gap, and a surface of the glass cover plate on a side facing away from the light guide column is flush with an outer surface of the display screen.

7. The laser projection device according to any one of claims 4 to 6, characterized in that: The width of the gap is less than 1.5 mm.

8. The laser projection device according to any one of claims 1 to 6, characterized in that: The collimating mirror has a first cylindrical surface and a second cylindrical surface; the first cylindrical surface is close to the laser and is used for collimation in a first direction; the second cylindrical surface is close to the light guide column and is used for collimation in a second direction; the first direction and the second direction intersect vertically.

9. The laser projection device according to any one of claims 1 to 6, characterized in that: The laser projection device also includes a PCB board, on which a ceramic heat dissipation structure is provided, and the laser is mounted on the surface of the ceramic heat dissipation structure.

10. A mobile terminal device, characterized in that: It comprises a frame structure, a display screen and the laser projection device as described in any one of claims 1 to 9; the light beam emitted by the laser projection device is emitted from the non-display area of ​​the display screen in a direction perpendicular to the display screen.

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