WO2020057208A1 - Dispositif électronique - Google Patents

Dispositif électronique Download PDF

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Publication number
WO2020057208A1
WO2020057208A1 PCT/CN2019/092167 CN2019092167W WO2020057208A1 WO 2020057208 A1 WO2020057208 A1 WO 2020057208A1 CN 2019092167 W CN2019092167 W CN 2019092167W WO 2020057208 A1 WO2020057208 A1 WO 2020057208A1
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WO
WIPO (PCT)
Prior art keywords
light
display screen
electronic device
module
filter
Prior art date
Application number
PCT/CN2019/092167
Other languages
English (en)
Chinese (zh)
Inventor
许星
杨鹏
朱亮
Original Assignee
深圳奥比中光科技有限公司
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Filing date
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Publication of WO2020057208A1 publication Critical patent/WO2020057208A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0264—Details of the structure or mounting of specific components for a camera module assembly
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0266—Details of the structure or mounting of specific components for a display module assembly
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices

Definitions

  • the invention belongs to the field of electronic technology, and particularly relates to an electronic device.
  • Photographing and display are a must-have function of many electronic devices.
  • a front camera and a display are simultaneously set on the front of the electronic device to meet a variety of needs, such as selfies, content display, and touch interaction.
  • full-screen electronic devices such as full-screen mobile phones
  • full-screen mobile phones have gradually become the new direction of mobile phone innovation, because full-screen mobile phones have a high screen ratio, are easy to manipulate, and have great aesthetics.
  • the current challenge for full-screen electronic devices is the conflict between the front camera and the display. The presence of the front camera makes it difficult for the display to truly fill the entire front of the phone in order to achieve a high screen ratio.
  • a flip or lift hidden camera design solution uses a flip or lift-type mechanical structure to flip or lift the camera located behind or inside the electronic device to the front when needed; the latter opens in the display and hides the camera in the opening.
  • the mechanical structure in the flip or lift hidden camera solution is easy to damage and the user experience is not perfect.
  • the special-shaped screen solution is not a true full-screen solution, and the special-shaped screen will affect the display effect to a certain extent.
  • the present invention provides an electronic device including a transparent display screen, an optical module, and Filter.
  • the transparent display screen includes a plurality of periodically arranged pixel units for display.
  • the optical module includes a light emitting module.
  • a filter is disposed between the transparent display screen and the optical module and is configured to Reducing visible light transmission from one side of the transparent display
  • the light emitting module includes a light source and a diffractive optical element, and is configured to emit a patterned light beam outward through the transparent display, the diffractive optical element being And configured to project a first diffracted beam after receiving an incident beam from the light source, and the first diffracted beam is diffracted again after being incident on the transparent display screen, and the patterned beam is projected outward.
  • the filter includes an optical switch that operates in a transparent or non-transparent state to allow or prevent light from passing through.
  • the filter includes a one-way see-through film, and a side surface of the one-way see-through film facing the display screen has a transmittance of visible light greater than a reflectance, and the one-way see-through film is far away from all The transmittance of visible light on one side of the display screen is less than the reflectance.
  • the filter includes a filter for blocking visible light and allowing only light beams in a non-visible wavelength range to pass, or the filter has low transmittance to visible light Based on the transmittance of invisible light.
  • the diffractive optical element is integrated into the transparent display screen.
  • the diffractive optical element is designed by the following steps:
  • a diffraction pattern of the diffractive optical element is calculated from the complex amplitude spatial distribution and the incident light beam.
  • the light emitting module further includes a lens disposed between the light source and the diffractive optical element, and the lens is used to collimate or focus a light beam emitted by the light source.
  • the optical module further includes a light receiving module, and the light receiving module is configured to collect the patterned light beam reflected by the object.
  • the patterned light beam includes one of a structured light patterned light beam, a flood light beam, a pulsed light beam, and a modulated light beam.
  • the light source includes one of an edge-emitting laser emitter, a vertical cavity surface laser emitter, and a laser diode, and the light source includes a single light source or an array light source composed of multiple sub-light sources.
  • the electronic device provided by the present invention has a beneficial effect relative to the prior art.
  • a filter is provided between the transparent display screen and the optical module, and the diffractive optical element in the light emitting module of the optical module is processed.
  • the design uses a filter to hide and view the optical module, so as to achieve a full screen and improve the display effect.
  • the diffractive optical element is configured to project a first diffracted beam after receiving an incident beam from the light source. A diffracted beam is diffracted again after being incident on the transparent display screen, and the patterned beam is projected outward, thereby improving the quality and effect of imaging or projection.
  • FIG. 1 is a schematic front view of an electronic device according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural composition diagram of an electronic device according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of an under-screen optical system according to a first embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of an under-screen optical system according to a second embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of an under-screen optical system according to a third embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of an under-screen optical system according to a fourth embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of an under-screen optical system according to a fifth embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of an under-screen optical system according to a sixth embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of an under-screen optical system according to a seventh embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of an under-screen optical system according to an eighth embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of an under-screen optical system according to a ninth embodiment of the present invention.
  • FIG. 12 is a schematic diagram of an electronic device including a spliced display screen according to an embodiment of the present invention.
  • FIG. 1 is a schematic front view of an electronic device according to an embodiment of the present invention.
  • the electronic device 10 includes a housing 105, a display screen 106 provided on the front, and a sensor on the top.
  • the sensor on the top includes a light emitting module 101, a camera 102, and a light receiving module 103, and may further include a speaker, ambient light / proximity, etc.
  • the sensor 104 is a sensor.
  • the display screen 106 may be a plasma display screen, a liquid crystal display (Liquid Crystal Display, LCD), a light emitting diode display (Light-Emitting Diode, LED), an organic light emitting diode display (Organic Light-Emitting Diode, OLED), etc.
  • the display screen 106 may also include a touch function.
  • a capacitive touch electrode is provided in the display screen 106 as an input device for human-computer interaction.
  • sensors can be placed on the top, can also be placed in other parts, or can be distributed in different parts of the electronic device. In some embodiments, the sensor may also be disposed on the back of the electronic device.
  • Sensors are used to send or receive external information from electronic devices, such as light and sound.
  • the camera 102 may be a visible light camera (color camera or grayscale camera), which is used to collect images of external objects, a speaker is used to convert electrical signals into sound signals and send them out, and an ambient light sensor is used to obtain external ambient light intensity information
  • the proximity sensor is used to detect whether an external object approaches the electronic device.
  • the transmitting module 101 and the light receiving module 103 can form a depth camera module for collecting depth image information of the external object. It can be understood that the type of the sensor is not limited to this, and different types of sensors can be provided in the electronic device according to actual needs.
  • the sensor further includes a flood light illumination module and the like.
  • FIG. 2 is a schematic structural composition diagram of an electronic device according to an embodiment of the present invention.
  • the electronic device also includes a processor 206 and a microphone 202, a radio frequency and baseband processor 203 connected thereto.
  • Interface 204, memory 205, battery 207, MEMS (Microelectromechanical Systems) sensor 208, audio device 209, etc. different units can realize data transmission and signal communication through circuit connection.
  • MEMS Microelectromechanical Systems
  • the electronic device may include fewer structures or include more other composition structures.
  • the electronic device may be a mobile phone, a computer, a game console, a tablet, a television, a wearable device, a smart watch, or the like.
  • the processor 206 is configured to perform overall control on the entire electronic device.
  • the processor 206 may be a single processor or may include multiple processor units, such as being composed of processor units with different functions.
  • the processor 206 may also be an integrated system on chip (SOC, System On Chip), which includes a central processing unit, an on-chip memory, a controller, a communication interface, and the like.
  • the processor 206 is an application processor, such as a mobile application processor, and is mainly responsible for implementing functions other than communication in the electronic device, such as text processing, image processing, and the like.
  • the display screen 106 is used to display images under the control of the processor 206 to present applications and the like to the user.
  • the display screen 106 may also include a touch function.
  • the display also serves as a human-computer interaction interface for receiving user input.
  • the microphone 202 is used to receive voice information and can be used to implement voice interaction with a user.
  • the radio frequency and baseband processor 203 is responsible for communication functions of the electronic device, such as receiving and translating signals such as voice or text to realize information exchange between remote users.
  • the interface 204 is used to connect the electronic device with the outside to further realize functions such as data transmission and power transmission.
  • the interface 204 is controlled by a communication interface in the processor 206.
  • the interface 204 may include a USB interface, a WIFI interface, and the like.
  • the memory 205 is configured to store data, such as application data, system data, and temporary code and data stored by the processor 206 during execution.
  • the memory 205 may be composed of a single or multiple memories, and may be any form of memory such as RAM (Random Access Memory), FLASH flash memory, and the like, which can be used to save data. It can be understood that the memory can be used as a part of the electronic device or can exist independently of the electronic device, such as cloud storage, and the data stored in it can communicate with the electronic device through the interface 204 and the like.
  • An application program such as a face recognition application is generally stored in a non-volatile readable storage medium. When the application is executed, the processor will call a corresponding program from the storage medium for execution.
  • the ambient light / proximity sensor 201 may be an integrated single sensor or an independent ambient light sensor and a proximity sensor.
  • the ambient light sensor is used to obtain the lighting information of the current environment where the electronic device is located.
  • the screen brightness can be automatically adjusted to provide a more comfortable display brightness for the human eye;
  • the proximity sensor can measure whether Some objects are close to the electronic device. Based on this, some functions can be implemented, such as turning off the touch function of the screen when a human face is close enough to prevent accidental touch when receiving a call.
  • the proximity sensor can also quickly determine the approximate distance between a human face and the electronic device.
  • the battery 207 is used to provide power.
  • the speaker 209 is used for voice output.
  • the MEMS sensor 208 is used to obtain the current state information of the electronic device, such as position, orientation, acceleration, gravity, etc. Therefore, the MEMS sensor 208 may include sensors such as an accelerometer, a gravity meter, and a gyroscope. In one embodiment, the MEMS sensor 208 can be used to activate some face recognition applications. For example, when a user picks up an electronic device, the MEMS sensor 208 can obtain this change and transmit this change to the processor 206. The processor 206 Call the stored face recognition application to perform a face recognition application.
  • the camera 102 is used for capturing images.
  • the processor controls the camera 102 to capture images and transmit the images to a display for display.
  • an unlocking program based on face recognition when the unlocking program is activated, the camera captures an image, and the processor processes the image, including face detection and recognition, and performs an unlocking task according to the recognition result.
  • the camera 102 may be a single camera or multiple cameras; in some embodiments, the camera 102 may include an RGB camera or a grayscale camera for collecting visible light information, or an infrared or ultraviolet camera for collecting invisible light information. In some embodiments, the camera 102 may include a light field camera, a wide-angle camera, a telephoto camera, and the like.
  • the camera 102 can be set at any position of the electronic device, such as the top or bottom of the front surface (same as the surface on which the display is located), the rear surface, etc.
  • the camera is set on the front of the electronic device 102 is used to collect a user's face image; the camera 102 is also disposed on the rear surface for taking pictures of the scene and the like.
  • the camera 102 is disposed on the front and rear surfaces, both of which can acquire images independently or can be controlled by the processor 102 to acquire images synchronously; in some embodiments, the camera 102 can also be a depth camera 210 For example, as a light receiving module or a color camera in the depth camera 210.
  • the depth camera 210 includes a light transmitting module 101 and a light receiving module 103, which are respectively responsible for transmitting and receiving signals of the depth camera.
  • the depth camera may further include a depth calculation processor for processing the received signals to obtain depth image information.
  • the deep computing processor may be a dedicated processor, such as an ASIC chip, or the processor 206 in an electronic device.
  • the light emitting module 101 and the light receiving module 103 may be an infrared laser speckle pattern projector and a corresponding infrared camera, respectively.
  • the infrared laser speckle pattern projector is used to emit to the surface of a space object. A preset speckle pattern of a specific wavelength.
  • the preset speckle pattern is reflected on the surface of an object and imaged in an infrared camera.
  • the infrared camera can obtain an infrared speckle image modulated by the object. Further, the infrared speckle image will be processed by depth calculation.
  • the calculator calculates to generate a corresponding depth image.
  • the light source in the projector can be selected from near-infrared light sources with wavelengths such as 850 nm and 940 nm.
  • the types of light sources can include edge-emitting lasers, vertical cavity surface lasers, or corresponding light source arrays.
  • the distribution of the spots in the preset spot pattern is generally randomly distributed to achieve the irrelevance of the sub-regions in a certain direction or in multiple directions, that is, any sub-region selected in a certain direction satisfies high uniqueness requirements.
  • the light emitting module 101 may also be composed of light sources such as LEDs and lasers that can emit visible light, ultraviolet light and other wavelengths, and is used to emit structures such as stripes, speckles, and two-dimensional coding. Light pattern.
  • the depth camera may also be a time-of-flight (TOF) depth camera, a binocular depth camera, or the like.
  • TOF depth cameras the light emitting module is used to emit a pulsed beam or a modulated (such as amplitude modulated) continuous wave beam.
  • the processor circuit calculates the beam emission and The time interval between receiving to further calculate the depth information of the object.
  • the binocular depth camera one is an active binocular depth camera, which includes a light emitting module and two light receiving modules.
  • the light emitting module projects a structured light image to an object, and the two light receiving modules acquire For two structured light images, the processor will directly use these two structured light images for depth image calculations; the other is binocular. At this time, the light emitting module can be regarded as another light receiving module. Each light receiving module collects two images, and the processor directly uses these two images to calculate a depth image.
  • a structured light depth camera is taken as an example to explain the idea of the present invention. It can be understood that the corresponding invention content can also be applied to other types of depth cameras.
  • the present invention sets the sensor on the back of the display screen.
  • the area corresponding to the sensor in the display screen 106 can still display the content normally as other areas, and the sensor can penetrate the display.
  • the screen sends or receives signals, such as flood light illumination, structured light projection, and image acquisition through the display screen.
  • the present invention not only avoids the disadvantage of poor reliability of the lifting structure, but also avoids the disadvantage of poor experience brought by the special-shaped screen.
  • FIG. 1 only gives a schematic front view of an electronic device.
  • the external shape and screen ratio of the electronic device may also be in other forms, such as a circular shape, an oval shape, a prism shape, and the like.
  • the optical module is used to receive or emit a light beam of a specified wavelength or wavelength region.
  • the optical module is divided into a visible light optical module and a non-visible light optical module.
  • the visible light optical module is used to emit or receive a visible light beam.
  • the visible light optical module is used to emit or receive non-visible light beams.
  • an infrared optical module is used as an example of the non-visible light optical module. It can be understood that, for example, ultraviolet, X-ray and other non-visible light optical modules Visible light is also suitable for the present invention.
  • FIG. 3 is a schematic structural diagram of an under-screen optical system according to a first embodiment of the present invention.
  • the under-screen optical system includes a display screen 31 and a light receiving module 33.
  • a light receiving module 33 is provided on one side of the display screen 31 (for example, the back and the lower part of the display screen).
  • the display screen 31 includes a transparent display screen such as a plasma display screen, an LCD, an LED, and an OLED. Display periodically arranged pixel units, such as pixel units periodically arranged in the horizontal and vertical directions. In order to make the display screen transparent so that the light beam can pass through, it can be achieved by reasonable design of multiple pixel units, such as setting a gap between the pixel units or part of the internal structure of the pixel units made of transparent materials.
  • the display has a certain aperture ratio, such as 50% aperture ratio.
  • the entire structure of each pixel unit of the display screen may also be made of a transparent material, thereby improving transparency.
  • the light receiving module 33 is configured to receive a light beam 34 from the display screen 31.
  • the light receiving module 33 includes an image sensor 331, a filter element 332, and a lens 333.
  • the image sensor 331 may be a CCD (Charge Coupled Device) or a CMOS (Complementary Metal-Oxide-Semiconductor Transistor, complementary metal oxide semiconductor).
  • the filter element 332 may be a Bayer filter, an infrared filter, or the like.
  • the light receiving module may also include other structural forms, such as a light field camera, a photodiode, and the like.
  • the lens 333 may be a single lens, or a lens group or a lens array.
  • FIG. 4 is a schematic structural diagram of an under-screen optical system according to a second embodiment of the present invention.
  • the under-screen optical system includes a display screen 41 and a light emitting module 43.
  • a light emitting module 43 is provided on one side of the display screen 41 (such as the back and the lower part of the display screen).
  • the display screen 41 is a transparent display screen, and the light receiving module 43 provided on one side can emit outward through the transparent display screen.
  • Light beam 44 (the outward emission referred to here is only an exemplary description and is not limited).
  • the light emitting module 43 includes a light source 431, a lens 432, and a diffractive optical element 433.
  • the light source 431 may be a light source such as an edge-emitting laser emitter, a vertical cavity surface laser emitter, or an LED, or may be a plurality of light sources.
  • An array light source composed of light sources, such as a vertical cavity surface laser emitter array chip; a lens 432 is used to collimate or focus the light beam emitted by the light source 431; the diffractive optical element 433 receives the light beam from the lens and diffracts to project a patterned light beam, Such as structured light patterned beams (such as speckle patterns, speckle patterns, etc.).
  • the light emitting module 43 may also be a flood illuminator, such as a flood illuminator composed of a light source and a diffuser; in some embodiments, the light emitting module 43 may also be a flashlight; In some embodiments, the light emitting module may also be a light source in a TOF camera, a proximity sensor, or the like, for emitting a pulse or a modulated light beam.
  • a flood illuminator such as a flood illuminator composed of a light source and a diffuser
  • the light emitting module 43 may also be a flashlight
  • the light emitting module may also be a light source in a TOF camera, a proximity sensor, or the like, for emitting a pulse or a modulated light beam.
  • the display screen and the optical module are further provided between the display screen and the optical module.
  • Filters 32 and 42 can be provided, and the filters 32 and 42 can be configured to reduce the transmission of visible light from one side of the display screen, so that external users cannot directly observe the optical module behind the display screen. It makes the display have the appearance integrity and enhances the visual beauty.
  • the optical filter is an optical switch, such as a liquid crystal shutter (liquid crystal spatial light modulator), which is in a non-transparent state when power is off and cannot pass light; it is in a transparent state when power is on and light can pass. Therefore, this optical switch is arranged between the optical module and the display screen, and the optical module can be hidden by setting the optical switch.
  • the optical switch When the optical module is working, set the optical switch to a transparent state to allow light to pass; while when the optical module is not working, set the optical switch to an opaque state to prevent light from passing through, so that users on the other side of the display cannot see the setting Optical module on the opposite side of the display.
  • the optical switch can also be made of other types of materials, such as electrochromic materials, thermochromic materials, or through a certain optical structure to make it possible to change whether light passes through.
  • the filter is a one-way see-through film.
  • the one-way see-through film allows external light to enter the optical module through the display screen and prevents internal light from passing through the display screen. That is, the one-way perspective film faces the optical module.
  • the transmittance of the side surface to visible light is less than the reflectance (for example, the transmittance is 5% to 30%, the reflectance is 90% to 95%), and the transmittance of visible light to the side of the display surface is greater than the reflectance ( For example, the transmittance is 60% to 95% and the reflectance is 5% to 30%).
  • the optical module on the display side is a visible light receiving module (such as a color camera), the transmission quality will affect the imaging quality to a certain extent; if the optical module on the display side is affected.
  • the invisible light beam is received or transmitted (infrared beam is used as an example), that is, when the optical module includes an infrared receiving module (such as an infrared camera), an infrared transmitting module, etc.
  • the corresponding unidirectional perspective film should be It is configured to have a high light transmittance to infrared light, that is, for the infrared receiving module, the surface of the one-way perspective film facing the display screen has a high transmittance for infrared light, and generally requires a transmittance greater than Reflectivity; for the infrared emitting module, the one-way perspective film facing the infrared emitting module is required to have a high transmittance for infrared light.
  • the transmittance is generally greater than the reflectivity, such as 80%. ⁇ 95% to ensure imaging or projection quality.
  • a better way is to choose a suitable unidirectional fluoroscopy film for different optical modules.
  • the filter is a filter for blocking visible light and allowing only light beams in a certain non-visible wavelength range to pass.
  • the optical module on the side of the display is an infrared receiving module (such as an infrared camera) or an infrared transmitting module
  • the use of an infrared filter can enable the infrared receiving module and the infrared transmitting module to collect infrared images and The infrared light beam is emitted to prevent visible light from passing through, thereby achieving the purpose of hiding the optical module behind the display screen.
  • the filter is a special filter.
  • the special filter has a low transmittance for visible light and a high transmittance for a certain invisible wavelength, such as Near infrared light, in a better example, for example, the transmittance to visible light is 10% to 50%, and the transmittance to near infrared light is 60 to 99%.
  • the transmittance to visible light is 10% to 50%
  • the transmittance to near infrared light is 60 to 99%.
  • the filter can be an independent optical device, or it can be combined with an optical module or a display screen.
  • the filter when it is in the form of a thin film, it can be set on the surface of the display screen or optical device as a coating. Filter.
  • the display screen 106 in addition to the sensor behind the display screen 106, it also includes other devices such as circuits, batteries, etc. In order to hide these devices, the filters described above can be used. In fact, because these devices do not need to collect or project the light beam outside the display screen, they can be opaque in a lower cost way to hide these devices, such as using opaque black or other colored polymer coatings.
  • the under-screen optical system includes a display screen 51, a filter 52, and a depth camera.
  • the depth camera includes a light receiving module 53 and a light emitting module 54, and a filter 52 is provided between the depth camera and the display screen 51.
  • the filter 52 is an optical switch.
  • the light-receiving module 53 and the light-emitting module 54 of the depth camera both work in the non-visible light band, such as the infrared band.
  • the light-receiving module is used to collect a light beam with a wavelength of 850 nm, and the light-emitting module 54 A 850nm wavelength light beam is emitted.
  • the filter can use an 850nm infrared filter to allow the 850nm wavelength light beam to pass through and prevent visible light from passing through to achieve the purpose of depth imaging and hiding the depth camera.
  • the under-screen optical system includes a display screen 61, a filter, and a depth camera.
  • the depth camera includes a light receiving module 65, a camera 66, and a light emitting module 67.
  • a filter is provided between the depth camera and the display screen 61.
  • the light receiving module 65 and the light emitting module 67 work in the non-visible light band to collect depth images (the infrared wavelength will be described as an example below), that is, the light receiving module 65 and the light emitting module 67 become Infrared receiving module and infrared light emitting module
  • the camera 66 is a visible light receiving module, such as a visible light camera for collecting visible light images, such as color images.
  • the filter can also be set as an optical switch, a unidirectional see-through film, a filter, and the like. However, in some embodiments, a single form of the filter is often unable to meet the needs, so it is necessary to set the filter into a combination of multiple different forms. As shown in FIG.
  • the filter includes a first filter 62, a second filter 63, and a third filter 64 (which correspond to the receiving module 65, the camera 66, and the light emitting module 67, respectively).
  • a third filter 64 which correspond to the receiving module 65, the camera 66, and the light emitting module 67, respectively.
  • the first filter 62, the second filter 63, and the third filter 64 are arranged along a direction perpendicular to the optical path of the optical module, that is, the first filter 62, the second filter 63, and the third
  • the filters 64 are individually arranged, and can be arranged at intervals or adjacently in order.
  • the filters 64 are determined according to the positional relationship between the receiving module 65, the camera 66, and the light emitting module 67, and there is no limitation on this.
  • the first filter 62 and the third filter 64 are infrared filters, and the second filter 63 is an optical switch or a unidirectional see-through film.
  • the first filter 62 is a first unidirectional see-through film
  • the third filter 64 is a third unidirectional see-through film
  • the second filter 63 is an optical switch or a second unidirectional see-through film.
  • the transmittance of the surface of the first, second, and third unidirectional see-through films facing the optical module is less than the reflectance, and the transmittance of the surface facing the display screen 61 is greater than the reflectance;
  • the transmittance of the surface of the first unidirectional see-through film facing the display screen 61 is greater than the reflectance
  • the transmittance of the surface of the third unidirectional see-through film facing the light emitting module is greater than the reflectance.
  • the first filter 62 and the third filter 64 are optical switches
  • the second filter 63 is an optical switch or a unidirectional see-through film.
  • FIG. 7 is a schematic structural diagram of an under-screen optical system according to a fifth embodiment of the present invention.
  • the filter between the optical module and the display screen 71 includes at least two layers. It can be understood that, for different optical modules, the number of layers included in the filter may be different, some may be a single layer, and some may be multiple layers. In this embodiment, two layers are used as an example for illustration. Sexual description.
  • the depth camera includes a light receiving module 74, a camera 75, and a light emitting module 76.
  • a filter is provided between the depth camera and the display 71, and the filter includes a direction (or a beam direction) along the optical module to the display.
  • the superimposed first filter 72 and the second filter 73 for example, the first filter 72 is an optical switch, and the second filter 73 is a unidirectional see-through film.
  • the display screen is generally composed of a plurality of pixel units that are periodically arranged horizontally and vertically.
  • the multiple pixel units form a periodic pixel diffraction structure, so the display screen will have a diffraction effect on the incident light beam, which will eventually cause the projection or imaging quality to decline. .
  • FIG. 8 is a schematic structural diagram of an under-screen optical system according to a sixth embodiment of the present invention.
  • the under-screen optical system includes a display screen 81 and a light emitting module.
  • the light emitting module includes a light source 82, a lens 83, and a first diffractive optical element (DOE, Diffractive Optical Elements) 84.
  • DOE diffractive optical element
  • the lens 83 is used to collimate or focus the light beam emitted by the light source 82.
  • the first diffractive optical element 84 receives the light from the lens.
  • the diffracted beam is projected into a first diffracted beam 85 after being diffracted, and the first diffracted beam 85 is projected into the external space through the display screen 81.
  • the lens 83 may be a lens group or a lens array. It can be understood that the composition of the light emitting module is not limited to this.
  • the light emitting module may be composed of only the light source 82 and the first DOE 84, or the light emitting module may include other devices, such as a micro lens array, etc. In short, according to actual needs, the light emitting module can have a corresponding structural composition.
  • a light emitting module composed of a light source, a lens, and a DOE is used to project a patterned light beam, such as a structured light patterned light beam (such as a speckle pattern, a stripe pattern, a two-dimensional pattern, etc.), a flood light beam, and a single beam. Spot beam, modulated TOF beam, etc.
  • a structured light patterned light beam such as a speckle pattern, a stripe pattern, a two-dimensional pattern, etc.
  • a flood light beam such as a single beam.
  • Spot beam modulated TOF beam, etc.
  • the display screen 81 is the second diffractive optical element (second DOE).
  • the beams have been affected, such as reduced contrast, increased noise, etc., and even the beam after the second diffraction is completely divergent from the patterned beam. For this reason, it poses a huge challenge to placing optical modules behind the screen.
  • the first DOE84 will no longer project a preset patterned beam (such as a preset speckle patterned beam), but will comprehensively consider the first DOE84 and the display screen (that is, the second DOE) during the design phase. ) 81 to achieve the following: the first DOE84 receives the incident light beam from the light source and projects a first diffracted beam 85, and the first diffracted beam 85 is diffracted again by the second DOE81 to project a patterned beam 86.
  • a preset patterned beam such as a preset speckle patterned beam
  • the design process of the first DOE84 generally includes the following steps:
  • the diffraction performance of the display screen which is the second DOE.
  • the complex amplitude transmittance function to describe it.
  • One possible detection method is to use a plane wave to enter the display screen from a single angle or multiple angles. The distribution is collected by the receiving screen, and the diffraction performance of the second DOE is measured by the light intensity distribution;
  • the complex amplitude spatial distribution of the first diffracted beam 85 is obtained from the patterned beam 86 through inverse diffraction calculation;
  • the diffraction pattern of the first DOE is calculated from the spatial distribution of the complex amplitude of the first diffracted beam 85 and the beam distribution before it is incident on the first DOE 84 through the lens 83.
  • the first DOE84 is not limited to only a single piece of DOE, but it can also be a multi-piece DOE.
  • the multi-piece DOE is not limited to being formed on different optical devices. For example, two sub-DOEs can be generated on the opposite surface of the same transparent optical device. .
  • the first DOE84 and the second DOE81 may not be limited to discrete devices.
  • the first DOE84 can be generated on the back of the second DOE81 display screen, which can improve the overall integration. Since the display 81 often has multiple Composition of layers with different functions.
  • the first DOE can also be integrated into a certain layer of the display screen 81, or one or more layers of the first DOE 84 can be integrated into the display screen 81. In a certain layer.
  • FIG. 9 is a schematic structural diagram of an under-screen optical system according to a seventh embodiment of the present invention.
  • the under-screen optical system includes a display screen 91 and a light emitting module.
  • the light emitting module includes a light source 92, a lens 93, and a first diffractive optical element (DOE) 94.
  • the lens 93 is used to collimate or focus the light beam emitted by the light source 92.
  • the first diffractive optical element 94 receives the light beam from the lens and diffracts it.
  • the patterned light beam 96 is projected, and the patterned light beam 96 is projected into the external space through the display screen 91.
  • a compensation element 95 is further provided between the first DOE 94 and the display screen 91.
  • the compensation element 95 is used to compensate the diffraction effect of the display screen (second DOE) 91.
  • a new compensation display screen 98 is composed of the compensation element 95 and the second DOE 91.
  • the compensation element 95 in the compensation display screen 98 is designed to be complementary to the diffraction effect of the display screen, thereby cancelling the second
  • the effect of DOE91 on the patterned light beam projected by the light emitting module that is, a plane wave incident on the iso-phase plane of the light emitted from the compensation display screen is still perpendicular to the direction of the incident light wave vector. Therefore, the patterned light beam emitted from the first DOE 94 is incident on the compensation display screen, and then projected into the space with the patterned light beam 97.
  • the compensation element 95 it is difficult for the compensation element 95 to completely eliminate the diffraction effect of the second DOE91, so it is difficult to ensure that the patterned beam 97 is the same as the patterned beam 96. A slight difference between the two is also allowed, such as in the space of intensity The distribution is slightly different.
  • the compensation element 95 can be configured as any optical element capable of changing the beam amplitude and / or phase, such as a DOE, a Spatial Light Modulator (SLM), and the like.
  • a spatial light modulator it may be a liquid crystal spatial light modulator, which is composed of multiple pixels, and each pixel can change the amplitude of the incident light by changing its properties (such as refractive index, gray scale, etc.). And / or phase.
  • the first DOE94 in FIG. 9 is designed in the same way as the DOE design idea in the conventional optical transmission module.
  • the first DOE84 in the embodiment shown in FIG. There is a greater difficulty increase.
  • the focus of the embodiment shown in FIG. 9 is to design the compensation element 95.
  • the design steps are as follows:
  • the design process of the compensation element 95 generally includes the following steps:
  • the second DOE91 For example, use the complex amplitude transmittance function to describe it.
  • One possible detection method is to use a plane wave to enter the display screen from a single angle or multiple angles. The distribution is collected by the receiving screen, and the diffraction performance of the second DOE91 is measured by the light intensity distribution;
  • the complex beam amplitude distribution of the incident beam incident on the second DOE91 is obtained from the outgoing beam 97 through inverse diffraction calculation;
  • the diffraction pattern of the compensation element 95 is calculated from the spatial distribution of the complex amplitude of the incident beam incident on the second DOE91 and the beam distribution of the incident beam 96 incident on the compensation element 95.
  • the spatial distribution of the incident light beam 96 and the outgoing light beam 97 incident on the compensation element 95 is almost the same, which may be a plane wave beam or a patterned beam.
  • the first DOE94 and the third DOE95 are not limited to only a single piece of DOE, but may also be formed by stacking multiple pieces of DOE in a stacked form, and the multiple pieces of DOE are not limited to forming On different optical devices, for example, two sub-DOEs can be generated on the opposite surfaces of the same transparent optical device, respectively.
  • the first DOE94 and the third DOE95 may not be limited to being separate devices, and two DOEs may be generated on the opposite surfaces of the same transparent optical device, respectively, as the first DOE94 and the third DOE95.
  • the third DOE95 and the second DOE91 are not limited to discrete devices.
  • the third DOE95 can be generated on one side of the display screen (second DOE91), thereby improving the overall integration. Composition of layers with different functions. In order to further improve the integration, the third DOE95 can also be integrated into one of them.
  • the relative positions of the first DOE94, the third DOE95, and the second DOE91 are not limited to the embodiment shown in FIG. 9.
  • the three can be designed according to actual needs.
  • the first DOE94 and the third DOE95 can be integrated into the first DOE94 and the third DOE95.
  • the positions of the first DOE94 and the third DOE95 can be interchanged.
  • any structural composition that does not violate the idea of the present invention is applicable to the present invention.
  • FIG. 10 is a schematic structural diagram of an under-screen optical system according to an eighth embodiment of the present invention.
  • the under-screen optical system includes a display screen 101 and a light receiving module.
  • the light receiving module includes an image sensor 102 and a lens 103.
  • the light beam 106 on the other side of the display screen 101 is incident on the lens 103 through the display screen 101 and is imaged on the image sensor 102. Due to the periodic microstructure of the pixels inside the display screen, it will diffract the incident light beam 106 and affect the imaging quality.
  • a compensation element 104 is further provided between the image sensor 102 and the display screen 101.
  • the first DOE 104 is used to compensate the diffraction effect of the display screen (second DOE) 101.
  • a new compensation display 105 is composed of the first DOE104 and the second DOE101.
  • the first DOE104 is designed to be complementary to the diffraction effect of the display, thereby canceling the second DOE101 imaging the light receiving module. The impact of quality.
  • the first DOE 104 is not limited to only a single DOE, and may also be a multi-piece DOE.
  • the multi-piece DOE is not limited to being formed on different optical devices.
  • two sub-DOEs can be generated on the opposite surfaces of the same transparent optical device.
  • the first DOE104 and the second DOE101 may not be limited to discrete devices.
  • the first DOE104 can be generated on one side of the display screen (second DOE101), thereby improving the overall integration degree. Since the display screen 101 often has It is composed of multiple layers with different functions.
  • the first DOE104 can also be integrated into a certain layer of the display 101, or one or more layers of the first DOE104 can be integrated into the display 101. In one of the layers.
  • each component can be fused with each other, such as for As far as the under-screen light emitting module shown in FIG. 8 is concerned, a diffractive optical element can be integrated into the inner layer of the display screen, and a filter is disposed between the lens and the DOE.
  • a diffractive optical element can be integrated into the inner layer of the display screen, and a filter is disposed between the lens and the DOE.
  • the under-screen optical system includes:
  • the depth camera is composed of a light receiving module and a light emitting module.
  • the light receiving module includes an image sensor 113 and a lens 114.
  • the light emitting module includes a light source 116, a lens 117, and a first DOE 118.
  • the compensation display 111 is composed of multiple layers and compensation elements integrated in the layers, and the first DOE 118 is also integrated in the layers.
  • the compensation element in this embodiment includes a first sub DOE115 corresponding to the light receiving module and a second sub DOE119 corresponding to the light transmitting module.
  • the first sub DOE115 and the second sub DOE119 are separately set, and their diffraction effects are different from those of the display
  • the diffraction effect of 111 is complementary.
  • At least one of the first sub DOE 115 and the second sub DOE 119 may be integrated into the display screen 111.
  • An optical filter 112 is provided between the light receiving module, the light emitting module and the display screen 111.
  • the structural form of the light receiving module and the display screen, and the structural form of the light emitting module and the display screen can be based on actual needs. Any combination is not limited to the embodiment shown in FIG. 11.
  • the structure of the light emitting module and the display screen 81 shown in FIG. 8 and the structure of the light receiving module and the display screen 101 shown in FIG. 10 can be combined into a screen. Depth camera.
  • the compensation elements 95 and 104 are liquid crystal spatial light modulators in the compensation display screen, since they have the function of modulating the amplitude and phase of the incident beam, they can be used not only for diffraction compensation, but also for diffraction compensation. Can be used as an optical switch to hide the light emitting module or light receiving module.
  • the liquid crystal spatial light modulator is adjusted to be in a transparent state, and the pixel units therein are phase-modulated to compensate the diffraction effect of the display screen 91 or 101 on the outgoing or incident light beam. This can greatly improve the system's functional and structural integration.
  • the optical module behind the display screen requires that the display screen can transmit light, that is, the transparent display screen, but the transparent display screen has a higher cost than the traditional non-transparent display screen.
  • the present invention provides a splicing display screen solution based on the above embodiments.
  • FIG. 12 is a schematic diagram of an electronic device including a spliced display screen according to an embodiment of the present invention.
  • the electronic device 12 includes a housing 125, a display screen 126 provided on the front, and a sensor, where the sensor includes a light emitting module 121, a camera 122, and a light receiving module 123, and may further include a sensor 124 such as a speaker, an ambient light / proximity sensor, and the like.
  • the display screen 126 is composed of two parts, namely a first display screen unit 126a and a second display screen unit 126b.
  • the sensor is disposed behind the first display screen unit 126a, and the first display screen unit 126a 126a is a transparent display screen, which allows sensors placed behind it to receive external information or transmit information to the outside.
  • the second display screen unit 126b is provided with different attributes from the first display screen unit 126a.
  • the second display screen unit 126b is a non-transparent display screen, such as a common LCD display screen or a common LED display screen.
  • the first display screen unit 126a and the second display screen unit 126b are the same type of display screen, for example, both are OLED display screens, but the aperture ratio of the first display screen unit 126a is greater than that of the second display screen.
  • Unit 126b to make it easier for light to pass through.
  • the entire display screen 126 is not necessarily formed by splicing, but two areas of the same display screen, and the aperture ratio of the two areas is controlled during design and manufacturing. In addition to the aperture ratio, other types of settings can also be used.
  • the resolution of the two areas is different.
  • the resolution of the first display unit 126a is smaller than that of the second display unit 126b.
  • the two areas are different.
  • the overall transparency of the material in the first display unit 126a is higher than the overall transparency of the material in the second display unit 126b, so that the transparency of the first display unit 126a is higher than that of the second display unit 126b .
  • the display screen 126 includes more than two display screen units, for example, a first display screen unit 126a is provided for each sensor.
  • the shapes of the first display screen unit 126a and the second display screen unit 126b are not limited to those shown in FIG. 12, for example, the first display screen unit 126a may be circular, and the second display screen unit 126b has a shape similar to that of the first display screen unit 126b.
  • 126a is a circular through hole adapted to form a whole display screen 126 together.
  • the first display screen 126a and the second display screen 126b are independently controlled.
  • the first display screen 126a is turned off, and the second display screen 126b can still display normally. content.
  • the solutions of the first display screen 126a can be applied to the splicing screen solution.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Projection Apparatus (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Abstract

La présente invention se rapporte au domaine technique de l'électronique. L'invention concerne un dispositif électronique. Le dispositif électronique comprend un écran d'affichage transparent, un module optique et un filtre de lumière. Le module optique comprend un module d'émission de lumière; le filtre de lumière est disposé entre l'écran d'affichage transparent et le module optique, et est configuré pour réduire la transmission de lumière visible d'un côté de l'écran d'affichage transparent; et le module d'émission de lumière comprend une source de lumière et un élément optique de diffraction, l'élément optique de diffraction étant configuré pour projeter un premier faisceau de diffraction après réception d'un faisceau incident provenant de la source de lumière, le premier faisceau de diffraction étant à nouveau diffracté après avoir été incident sur l'écran d'affichage transparent, et un faisceau à motifs étant projeté vers l'extérieur. Dans la présente invention, un filtre de lumière est disposé entre un écran d'affichage et un module optique, et le filtre de lumière est utilisé pour cacher et visualiser le module optique, ce qui permet de réaliser un écran complet et d'améliorer l'effet d'affichage; et un élément optique de diffraction dans un module d'émission de lumière permet d'obtenir un faisceau à motif prédéfini après un faisceau incident une source de lumière est diffractée deux fois par l'intermédiaire de l'élément optique de diffraction et de l'écran d'affichage, ce qui permet d'améliorer la qualité et l'effet d'imagerie ou de projection.
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