Patent Publication Number: US-2023152426-A1

Title: Display Assembly and Display Device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a Bypass Continuation application of PCT/CN2021/107765 filed Jul. 22, 2021, and claims priority to Chinese Patent Application No. 202010718348.X filed Jul. 23, 2020, the disclosures of which are hereby incorporated by reference in their entireties. 
    
    
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     This application relates to the field of communication technologies, and in particular, to a display assembly and a display device. 
     Description of Related Art 
     With the development of mobile intelligent terminals, the three-dimensional (3D) sensing technology gradually becomes a standard hardware configuration of smartphones. Time of flight (TOF) is widely applied. In smartphones, the TOF is applied to physical ranging, 3D modeling, photographing performance improvement, and the like. 
     SUMMARY OF THE INVENTION 
     According to a first aspect, an embodiment of this application provides a display assembly, including: 
     a display panel; 
     a cover plate, disposed on a display side of the display panel; 
     a diverging element, located on a side of the cover plate close to the display panel, where the diverging element is disposed in a non-display region of the cover plate and is configured to diverge received light and emit diverged light; 
     an emission module, configured to emit light, where the emission module is disposed on a non-display side of the display panel and faces the diverging element; and 
     a receiving module, disposed on the non-display side of the display panel and configured to receive reflected light that is formed by a detection target through reflecting light diverged by the diverging element. 
     According to a second aspect, an embodiment of this application provides a display device, including the display assembly in the foregoing embodiment. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a transmission path of a laser signal. 
         FIG.  2    is a schematic diagram of a region of light emission according to an embodiment of this application. 
         FIG.  3    is a schematic structural diagram of a display assembly according to an embodiment of this application. 
         FIG.  4    is another schematic structural diagram of a display assembly according to an embodiment of this application. 
         FIG.  5    is a schematic diagram of a working process according to an embodiment of this application. 
         FIG.  6    is a schematic diagram of a VCSEL chip according to an embodiment of this application. 
     
    
    
     REFERENCE NUMERALS IN THE DRAWINGS 
     
         
         
           
             Display panel  10 ; 
             Cover plate  20 ; 
             Diverging element  30 ; 
             Receiving module  40 ; 
             Light source  50 ; Light collimator  51 ; First prism  52 ; Second prism  53 ; 
             Housing structure  54 ; Rhombic prism  55 ; 
             Frame body  60 ; 
             Base plate  70 ; Chip  71 ; Glass substrate  72 ; Optical structure  73 ; 
             Detection target  80 . 
           
         
       
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The following clearly describes the technical solutions in the embodiments in this application with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are merely some but not all of the embodiments of this application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of this application shall fall within the protection scope of this application. 
     Terms “first”, “second”, and the like in the specification and claims of this application are used to distinguish similar objects, but are not used to describe a specific sequence or order. It should be understood that the data so used may be interchanged in an appropriate condition, so that the embodiments of this application can be implemented in an order other than those illustrated or described herein. In addition, in this specification and the claims, “and/or” represents at least one of the connected objects, and the character “I” generally indicates an “or” relationship between the associated objects. 
     A display assembly provided in the embodiments of this application is described below with reference to the accompanying drawings by using embodiments and application scenarios thereof. 
     Currently, as shown in  FIG.  1   , when under-screen TOF design is adopted, a laser signal emitted by a signal emitter passes through a display  1  twice before being received by a signal receiver. The transmittance of the display  1  has great impact on TOF imaging. A laser signal of a TOF detection target passes through a display twice, and experiences two significant attenuations, which leads to extremely low utilization of laser energy. Due to the high energy of the TOF laser, when an infrared laser illuminates a display region of the display from the rear side, an organic light-emitting material of display pixels in the illuminated region ages severely. As a result, the display effect of the illuminated region has an obvious color difference, which leads to serious quality problems. 
     As shown in  FIG.  3    and  FIG.  4   , according to an embodiment of this application, the display assembly includes a display panel  10 , a cover plate  20 , a diverging element  30 , an emission module, and a receiving module  40 . The cover plate  20  is disposed on a display side of the display panel  10 . The diverging element  30  is located on a side of the cover plate  20  close to the display panel  10 . The diverging element  30  is disposed in a non-display region of the cover plate  20  and is configured to diverge received light and emit diverged light. The emission module is configured to emit the light. The emission module is disposed on a non-display side of the display panel  10  and faces the diverging element  30 . The receiving module  40  is disposed on the non-display side of the display panel  10  and is configured to receive reflected light that is formed by a detection target through reflecting light diverged by the diverging element  30 . 
     In other words, the display assembly mainly includes the display panel  10 , the cover plate  20 , the diverging element  30 , the emission module, and the receiving module  40 . The cover plate  20  may be a member made of a transparent material, such as a glass plate, and may be disposed on the display side of the display panel  10 . The display panel  10  may be protected by the cover plate  20 . The diverging element  30  may diverge light incident on the diverging element  30 , so that light transmitted from the diverging element  30  has a large angle and can illuminate a large region. The diverging element  30  may be located on the side of the cover plate  20  close to the display panel  10 . The diverging element  30  and the display panel  10  are located on the same side of the cover plate  20 . The diverging element  30  is disposed on the non-display region of the cover plate  20  and is configured to diverge received light and emit diverged light. The non-display region is a region of the cover plate  20  that is not covered by the display panel  10 , that is, the diverging element  30  is disposed on the region of the cover plate  20  that is not covered by the display panel  10 . For example, as shown in  FIG.  2   , the diverging element  30  may be disposed on a non-display region on the top or a side of the cover plate  20 , so that the light can exit from the non-display region on the top or the side of the cover plate  20 . 
     The emission module may be configured to emit light, and the light emitted by the transmission module may be transmitted to the diverging element  30 . The emission module is disposed on the non-display side of the display panel  10  and faces the diverging element  30 . The emission module emits light to the diverging element  30 . The diverging element  30  may diverge the light after receiving the light emitted by the emission module. The receiving module  40  is disposed on the non-display side of the display panel  10 , and may be configured to receive reflected light that is formed by a detection target through reflecting light diverged by the diverging element  30 . The receiving module  40  may include a module lens and a module image sensor, and may receive a light signal through the module lens and the module image sensor. The display assembly may further include a processing module, and the light signal is processed by the processing module. When the detection target is close to a side of the cover plate away from the display panel  10 , the detection target starts to reflect light after entering a region of light diverged by the diverging element  30 . The receiving module  40  may receive light reflected by the detection target, to perform identification and analysis and make decisions according to the received reflected light. In the display assembly of this application, the light emitted by the emission module to the diverging element is diverged by the diverging element to form a light region with a large angle. Light is diverged from the non-display region of cover plate  20  and does not pass through the display panel  10  during emission. In this way, a light signal loss is reduced and light utilization is increased. The damage to the organic light-emitting material when the light illuminates the display region is reduced, and the color difference in the display effect of the illuminated region is reduced, thereby avoiding serious quality problems and punching on the display panel. 
     In an application process, as shown in  FIG.  5   , the emission module emits modulated light, such as near-infrared light. The light is reflected after encountering the detection target  80 , and the receiving module  40  may receive light reflected by the detection target. The processing module calculates a time difference or phase difference between emission and reflection of the light to infer a distance of a photographed object, so as to generate depth information. Moreover, the object may be photographed by using a camera, to present three-dimensional contours of the object in a form of a topographic map with different colors representing different distances. 
     In some embodiments of this application, the cover plate  20  may be provided with an optical adhesive layer in a region corresponding to the diverging element  30 , where the optical adhesive layer may be a transparent optical adhesive layer. The diverging element  30  may be glued on the cover plate  20  by the optical adhesive layer for ease of installing the diverging element  30 . The diverging element  30  may also be glued on the cover plate  20  by other highly-transparent glue with high transmittance for the light emitted by the emission module. The light emitted by the emission module can pass through the optical adhesive layer, thereby avoiding a light loss caused by the optical adhesive layer. Alternatively, the diverging element  30  may be integrated with the cover plate  20  to reduce fitting processes and a quantity of devices. 
     In some embodiments, the emission module may include a light source  50  and an optical component. The light source  50  may be configured to emit light. The optical component may be configured to receive the light emitted by the light source  50 , and may transmit the received light to the diverging element  30 . After the light is diverged by the diverging element  30 , the light transmitted from the diverging element  30  has a large angle and can illuminate a large region. 
     The emission module further includes a light collimator  51 . Collimated light is transmitted from the light collimator  51  after the light emitted by the light source  50  is collimated by the light collimator  51 . The light is collimated by the light collimator  51 , thereby ensuring that a transmission path of the light is in a fixed region. The optical component adjusts the collimated light. For example, the optical component may adjust a transmission direction of the collimated light, or may cause the collimated light to be displaced/shifted. The optical component may transmit the adjusted light to the diverging element  30 . 
     In some other embodiments of this application, the emission module may include a light source  50 , a light collimator  51 , and an optical component. The light source  50  may emit light, for example, a laser or an infrared ray. The light source  50  may be a vertical-cavity surface-emitting laser (VCSEL) chip, or an edge emitting laser (EEL) chip. The light emitted by the light source  50  may be transmitted to the light collimator  51 . Collimated light may be transmitted after the light emitted by the light source  50  is adjusted by the light collimator  51 . The light is collimated by the light collimator  51 , thereby ensuring that the transmission path of the light is in the fixed region. The optical component may receive the collimated light from the light collimator  51  and adjust the collimated light. For example, the optical component may adjust the transmission direction of the collimated light, or may cause the collimated light to be displaced/shifted. The optical component transmits the adjusted light to the diverging element  30 . The light source  50 , the light collimator  51 , and the optical component jointly cause the light to be transmitted to the diverging element  30 . After being diverged by the diverging element  30 , the light is transmitted from the non-display region of the cover plate  20  to form a light region with a large angle for ease of detecting a detection target. 
     As shown in  FIG.  6   , the VCSEL chip may include a base plate  70 , and a side wall disposed on the base plate  70 . The base plate  70  and the side wall may define a cavity in which a chip  71  connected to a gold wire may be disposed. A glass substrate  72  is disposed at an opening of the cavity to close the cavity. The glass substrate  72  may be provided with an optical structure  73  (such as a diffuser) on a side facing the chip  71 , so that the light is diffused evenly with a large angle and the light emitted by the chip can be transmitted through the optical structure. 
     In some embodiments, as shown in  FIG.  3   , the optical component may include a first prism  52  and a second prism  53 . The collimated light transmitted from the light collimator  51  is transmitted to the first prism  52 , and the first prism  52  may adjust the transmission direction of the collimated light. The collimated light adjusted by the first prism  52  may be transmitted to the second prism  53 , and the second prism  53  may adjust the transmission direction of the light transmitted from the first prism  52 , so that the adjusted light is transmitted to the diverging element  30 . The first prism  52  and the second prism  53  are used for adjusting the transmission direction of the collimated light transmitted from the light collimator  51 . The light is then transmitted to the diverging element  30  and diverged by the diverging element  30 , and is transmitted from the non-display region of the cover plate  20 . In this way, an even light region with a large angle required for object detection is generated. Installation positions of the first prism  52 , the second prism  53 , the light source  50 , and the light collimator  51  may be set as required. Besides, different optical structures may be added to adjust the transmission direction of the light. 
     Optionally, as shown in  FIG.  3   , the emission module may further include a housing structure  54 . The light source  50 , the light collimator  51 , and the first prism  52  may be encapsulated in the housing structure  54 . The housing structure  54  encapsulates the light source  50 , the light collimator  51 , and the first prism  52  together, which can achieve a good integration effect and avoid relative position movement among the light source  50 , the light collimator  51 , and the first prism  52 . In this way, deviation of the light transmission direction is reduced, thereby ensuring the accuracy of the light transmitted from the first prism  52 . 
     In this embodiment of this application, the emission module may further include a housing structure  54 . The light source  50  and the light collimator  51  may be encapsulated in the housing structure  54 . The housing structure  54  encapsulates the light source  50  and the light collimator  51  together, which can achieve a good integration effect and help ensure the accuracy of the light transmitted from the light collimator  51 . The first prism  52  may be disposed on the non-display side of the display panel  10 , glued to the non-display side of the display panel  10  by an optical clear adhesive, and disposed on the display panel  10 . 
     Optionally, the display assembly may further include a frame body  60 . The second prism  53  may be disposed on the frame body  60 , and the cover plate  20  may be connected to the frame body  60 . Alternatively, the receiving module  40  may be disposed on the frame body  60 . The light source  50  and the light collimator  51  may be disposed on the frame body  60 . The frame body  60  may support and fix other components in the assembly. 
     In some embodiments of this application, as shown in  FIG.  4   , the optical component may include a rhombic prism  55 . The collimated light transmitted from the light collimator  51  may be transmitted to the rhombic prism  55 . The rhombic prism  55  may cause the collimated light transmitted from the light collimator  51  to be displaced/shifted, so that the displaced/shifted light is transmitted to the diverging element  30 . The rhombic prism  55  may adjust the displacement of the collimated light transmitted from the light collimator  51 , without adjusting the transmission direction of the collimated light. In other words, the collimated light incident on the rhombic prism  55  is adjusted by the rhombic prism  55 , and the light transmitted from the rhombic prism  55  is transmitted to the diverging element  30 . A position relationship between the rhombic prism  55  and the light collimator  51  may be adjusted as required, so as to meet space installation requirements. The emission module may further include a housing structure  54 . The light source  50  and the light collimator  51  may be encapsulated in the housing structure  54 , and the rhombic prism  55  may be connected to the housing structure  54 . A side of the rhombic prism  55  may be connected to the housing structure  54 , and another side of the rhombic prism  55  may be connected to the frame body  60  by gluing. In this way, the rhombic prism  55  is stable and firm and does not become loose easily, thereby effectively reducing a tolerance of system assembly and ensuring the accuracy of the light. 
     In this embodiment of this application, the non-display region of the cover plate  20  may be coated with an ink layer, and the light emitted by the emission module may pass through the ink layer. For example, the light emitted by the emission module is an infrared ray. The infrared ray can pass through the ink layer, thereby avoiding a loss of light caused by the ink layer. 
     An embodiment of this application further provides a display device, including the display assembly in the foregoing embodiment. In the display device of this application, light emitted by an emission module does not pass through a display panel. In this way, a light signal loss is reduced and light utilization is increased. Damage to an organic light-emitting material when the light illuminates a display region is reduced, thereby improving a display effect and avoiding punching on the display panel. 
     The embodiments of this application have been described above with reference to the accompanying drawings. This application is not limited to the embodiments described above, and the embodiments described above are merely exemplary and not limitative. Those of ordinary skill in the art may make various variations under the teaching of this application without departing from the spirit of this application and the protection scope of the claims, and such variations shall all fall within the protection scope of this application.