Patent Publication Number: US-2023146599-A1

Title: Light-guiding plate assembly, backlight module and display device

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application claims priority to Chinese Patent Application No. 202211056637.3 filed Aug. 31, 2022, the disclosure of which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     The present disclosure relates to the field of display technologies and, in particular, a light-guiding plate assembly, a backlight module, and a display device. 
     BACKGROUND 
     With development in the display technologies, a plane display device such as a liquid crystal display (LCD) panel is widely applied to various electronic products such as a mobile phone, a television, a digital camera, and a laptop, and becomes the mainstream of display devices due to the advantages of high quality, power saving, and wide application range. 
     Since the LCD panel itself does not emit light, the LCD panel needs to be used in cooperation with a backlight module. The existing backlight module has problems of uneven light brightness and optical crosstalk. 
     SUMMARY 
     In view of this, embodiments of the present disclosure provide a light-guiding plate assembly, a backlight module, and a display device to improve the light-emitting uniformity of the backlight module, and to alleviate the optical crosstalk of the backlight module. 
     Embodiments of the present disclosure provide a light-guiding plate assembly. The light-guiding plate assembly includes a reflective portion and a transmissive portion. The transmissive portion includes a first sub-transmissive-portion and a second sub-transmissive-portion. In a direction perpendicular to a plane where the light-guiding plate assembly is located, the first sub-transmissive-portion does not overlap the reflective portion. The second sub-transmissive-portion is located on a side of the reflective portion facing a light-exiting side of the light-guiding plate assembly. 
     Embodiments of the present disclosure provide a backlight module. The backlight module includes a backlight and the preceding light-guiding plate assembly. The light-guiding plate assembly is located on a light-exiting side of the backlight. 
     Embodiments of the present disclosure provide a display device. The display device includes an imaging component and the preceding backlight module. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       To illustrate solutions in embodiments of the present disclosure more clearly, the drawings used in description of the embodiments will be briefly described below. 
         FIG.  1    is a perspective view of a light-guiding plate assembly according to embodiments of the present disclosure. 
         FIG.  2    is a sectional view of the light-guiding plate assembly of  FIG.  1    taken along AA′. 
         FIG.  3    is a sectional view of a backlight module according to embodiments of the present disclosure. 
         FIG.  4    is a perspective view of a reflective portion in a light-guiding plate assembly according to embodiments of the present disclosure. 
         FIG.  5    is a top view of a reflective portion in a light-guiding plate assembly according to embodiments of the present disclosure. 
         FIG.  6    is another perspective view of a light-guiding plate assembly according to embodiments of the present disclosure. 
         FIG.  7    is a perspective view of a transmissive portion corresponding to multiple light-guiding plate units according to embodiments of the present disclosure. 
         FIG.  8    is a perspective view of a transmissive portion corresponding to a single light-guiding plate unit according to embodiments of the present disclosure. 
         FIG.  9    is a top view of a transmissive portion in a light-guiding plate assembly according to embodiments of the present disclosure. 
         FIG.  10    is another perspective view of a transmissive portion according to embodiments of the present disclosure. 
         FIG.  11    is sectional view of another light-guiding plate assembly according to embodiments of the present disclosure. 
         FIG.  12    is a view of paths of light passing through a recessed structure provided with a microstructure. 
         FIG.  13    is another sectional view of a light-guiding plate assembly according to embodiments of the present disclosure. 
         FIG.  14    is another sectional view of a light-guiding plate assembly according to embodiments of the present disclosure. 
         FIG.  15    is a laminating view of a backlight module according to embodiments of the present disclosure. 
         FIG.  16    is a sectional diagram of a display device according to embodiments of the present disclosure. 
         FIG.  17    is a top view of a display device according to embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     In order to better understand the solutions of the present disclosure, embodiments of the present disclosure will be detailed below in conjunction with the drawings. 
     Terms used in the embodiments of the present disclosure are merely used to describe the specific embodiments and not intended to limit the present disclosure. As used in the embodiments of the present disclosure and the appended claims, the singular forms, including “a”, “the” and “this”, are intended to include the plural forms as well, unless the context clearly indicates otherwise. 
     It should be understood that the term “and/or” in the embodiments of the present disclosure describes the association relationships of associated objects and indicates that three relationships may exist. For example, A and/or B may indicate three conditions of A alone, both A and B, and B alone. In addition, the character “I” of the embodiments of the present disclosure generally indicates that the front and rear associated objects are in an “or” relationship. 
     It should be understood that although the terms first and second may be used in the embodiments of the present disclosure to describe sub-transmissive-portions, these sub-transmissive-portions should not be limited to these terms. These terms are only used for distinguishing the sub-transmissive-portions. For example, without departing from the scope of the present disclosure, a first sub-transmissive-portion may be referred to as a second sub-transmissive-portion. Similarly, the second sub-transmissive-portion may be referred to as the first sub-transmissive-portion. 
     Embodiments of the present disclosure provide a light-guiding plate assembly. As shown in  FIG.  1   ,  FIG.  1    is a perspective view of a light-guiding plate assembly  1  according to embodiments of the present disclosure. A light-incidence side  101  of the light-guiding plate assembly  1  and a light-exiting side  102  of the light-guiding plate assembly  1  are disposed in the thickness direction h 1  of the light-guiding plate assembly  1 . Arrows passing through the light-guiding plate assembly  1  in  FIG.  1    illustrate the propagation direction of light passing through the light-guiding plate assembly  1 . 
     When the light-guiding plate assembly  1  and a backlight are fitted to form a backlight module, the backlight may be disposed facing the light-incidence side  101  of the light-guiding plate assembly  1 . The light-guiding plate assembly  1  can guide the light emitted from the backlight to make the light emitted from the backlight enter from the light-incidence side  101  of the light-guiding plate assembly  1  and exit from the light-exiting side  102  of the light-guiding plate assembly  1 . 
     Referring to  FIGS.  1  and  2   ,  FIG.  2    is a sectional view of the light-guiding plate assembly of  FIG.  1    taken along AA′. The light-guiding plate assembly  1  includes multiple light-guiding plate units  10  arranged in an array in a direction parallel to the plane where the light-guiding plate assembly  1  is located. As shown in  FIG.  1   , a plane where intersection of the first direction h 21  and the second direction h 22  is located defines the plane where the light-guiding plate assembly  1  is located. 
     As shown in  FIGS.  1  and  2   , a light-guiding plate unit  10  includes a light-emitting element disposing region A 1 . The light-emitting element disposing region A 1  is used to dispose a light-emitting element. 
     As shown in  FIG.  2   , the light-guiding plate unit  10  also includes a reflective portion  11  and a transmissive portion  12 . The reflective portion  11  is used to reflect the light emitted from the light-emitting element. The transmissive portion  12  is used to transmit the light emitted from the light-emitting element. The reflectance of the reflective portion  11  is higher than the reflectance of the transmissive portion  12 . The transmittance of the transmissive portion  12  is higher than the transmittance of the reflective portion  11 . The reflective portion  11  is used to reflect the light. The transmissive portion  12  is used to transmit the light. 
     In the embodiments of the present disclosure, as shown in  FIG.  2   , the transmissive portion  12  includes a first sub-transmissive-portion  121  and a second sub-transmissive-portion  122 . In the direction perpendicular to the plane where the light-guiding plate assembly  1  is located, the first sub-transmissive-portion  121  does not overlap the reflective portion  11 , and the second sub-transmissive-portion  122  is located on a side of the reflective portion  11  facing the light-exiting side  102  of the light-guiding plate assembly  1 . In an example, the first sub-transmissive-portion  121  is disposed corresponding to the preceding light-emitting element disposing region A 1 . That is, when the light-guiding plate assembly  1  and the backlight are fitted to form the backlight module, as shown in  FIG.  3   , which is a sectional view of a backlight module  100  according to embodiments of the present disclosure, the light-emitting element  30  in the backlight may be disposed corresponding to the light-guiding plate unit  10  in the embodiments of the present disclosure. In some embodiments, the light-emitting element  30  may be disposed corresponding to the first sub-transmissive-portion  121  in the light-guiding plate unit  10 . 
     After the light-guiding plate assembly  1  and light-emitting elements  30  are assembled to form the backlight module  100 , when the backlight module  100  works, for small-angle light emitted from the light-emitting element  30 , such as the small-angle light R 1  and the small-angle light R 2  shown in  FIG.  3   , can exit from the light-guiding plate assembly  1  after the small-angle light R 1  and the small-angle light R 2  are emitted into the light-guiding plate assembly  1  through the first sub-transmissive-portion  121 . Herein, the small-angle light refers to light emitted from the light-emitting element  30  and having small included angles with respect to the thickness direction of the light-guiding plate assembly  1 . For large-angle light emitted from the light-emitting element  30 , such as the large-angle light R 3  shown in  FIG.  3   , can be reflected by the reflective portion  11  to propagate in a direction facing the light-exiting side of the light-guiding plate assembly  1 . Herein, the large-angle light refers to light emitted from the light-emitting element  30  and having large included angles with respect to the thickness direction of the light-guiding plate assembly  1 . With this arrangement, the large-angle light R 3  is prevented from irradiating to the region where other light-emitting elements  30  are located, avoiding mutual crosstalk of the light emitted from different light-emitting elements  30 . Moreover, such an arrangement can improve the intensity of light emitted from the region where the reflective portion  11  is located in the light-guiding plate assembly  1 , balance the intensity of light emitted from the region where the first sub-transmissive-portion  121  is located and the intensity of light emitted from the region where the second sub-transmissive-portion  122  is located, facilitating improving the uniformity of the intensity of light emitted from different regions in the light-guiding plate assembly  1 . In addition, such an arrangement can also improve the utilization rate of the large-angle light emitted from the light-emitting element  30 , facilitating improving the brightness of the backlight module  100  including the light-guiding plate assembly  1  and reducing the power consumption of the backlight module  100 . 
     In an example, as shown in  FIGS.  2 ,  3  and  4   ,  FIG.  4    is a perspective view of a reflective portion  11  in a light-guiding plate assembly  1  according to embodiments of the present disclosure. The reflective portion  11  includes a bottom surface  111  facing the light-incidence side  101  of the light-guiding plate assembly  1  and a side surface  112  facing the second sub-transmissive-portion (not shown in  FIG.  4   ). The included angle α (not shown in  FIG.  4   ) is provided between the side surface  112  and the bottom surface  111 . In the embodiments of the present disclosure, 0°&lt;α&lt;90°. The side surface  112  of the reflective portion  11  may be served as a reflective surface. In the embodiments of the present disclosure, by setting 0°&lt;α&lt;90°, when the light-guiding plate assembly  1  and the light-emitting element  30  are fitted, as shown in  FIG.  3   , in the direction parallel to the plane where the light-guiding plate assembly  1  is located, the light-emitting element  30  may be disposed on a side of the side surface  112  facing away from the bottom surface  111 . As shown in  FIG.  4   , the light-emitting element disposing region A 1  is disposed to be located on a side of the side surface  112  of the reflective portion  11  facing away from the bottom surface  111 . In this way, when the light-emitting element  30  emits the light, more large-angle light emitted from the light-emitting element  30  can be received by the side surface  112  of the reflective portion  11 , and the reflected light can be emitted from the light-guiding plate assembly  1  through the first sub-transmissive-portion (not shown in  FIG.  4   ), avoiding the mutual crosstalk between the large-angle light and the light emitted from other light emitting elements  30 , as well as fully utilizing the large-angle light emitted from the light-emitting element  30 , improving the brightness of the backlight module  100  including the light-guiding plate assembly  1 , and reducing the power consumption of the backlight module  100 . 
     As shown in  FIG.  3   , in the embodiments of the present disclosure, the reflective portion  11  in a single light-guiding plate unit  10  may be disposed around the light-emitting element  30  so that the reflective portion  11  reflects more large-angle light emitted from the light-emitting element  30  in various directions to improve the brightness of the backlight module  100  including the light-guiding plate unit  1 . 
     As shown in  FIGS.  2 ,  3 ,  4  and  5   ,  FIG.  5    is a top view of a reflective portion  11  in a light-guiding plate assembly according to embodiments of the present disclosure. In the embodiments of the present disclosure, the reflective portion  11  may be provided with a structure similar to a reflective bowl. In the embodiments of the present disclosure, at least part of the bottom portion of the reflective bowl is removed to make room for disposing the light-emitting element  30 . That is, as shown in  FIG.  3   , when the light-guiding plate assembly  1  and the light-emitting element  30  are assembled, the light-emitting element  30  is disposed in a way that the light-emitting element  30  does not overlap the reflective portion  11 . 
     In an example, as shown in  FIG.  6   ,  FIG.  6    is another perspective view of a light-guiding plate assembly according to embodiments of the present disclosure. A light-incidence side  101  of a light-guiding plate assembly  1  is provided with an opening H disposed corresponding to a first sub-transmissive-portion (not shown in  FIG.  6   ). A light-emitting element (not shown in  FIG.  6   ) may be disposed in the opening H. 
     As shown in  FIG.  3   , when the light-guiding plate assembly  1  and the light-emitting element  30  are fitted, in the embodiments of the present disclosure, the bottom surface of the light-emitting element  30  and the bottom surface  111  of the reflective portion  11  may be disposed on the same plane. In the direction parallel to the plane where the light-guiding plate assembly  1  is located, the reflective portion  11  at least partially overlaps the light-emitting element  30 . Such an arrangement is equivalent to at least partially embedding the light-emitting element  30  in the light-guiding plate assembly  1 , facilitating reducing the thickness of the backlight module  100  including the light-emitting element  30  and the light-guiding plate assembly  1 . 
     In an example, in the light-guiding plate assembly  1 , as shown in  FIGS.  2  and  3   , the second sub-transmissive-portion  122  and the reflective portion  11  are attached to each other at the position where the side surface  112  of the reflective portion  11  is located. 
     In the embodiments of the present disclosure, the transmissive portion  12  located in a light-guiding plate unit  10  may be provided as a frustum structure similar to a cone frustum or a pyramid frustum. For example, when the side surface  112  of the reflective portion  11  is a plane, the side surface of the transmissive portion  12  is also provided as a plane. That is, the transmissive portion  12  is designed as a pyramid frustum structure. When the side surface  112  of the reflective portion  11  is an arc surface, the side surface of the transmissive portion  12  is also provided as an arc surface. That is, the transmissive portion  12  is designed as a cone frustum. In an example, as shown in  FIGS.  7 ,  8  and  9   ,  FIG.  7    is a perspective view of a transmissive portion corresponding to multiple light-guiding plate units  10  according to embodiments of the present disclosure,  FIG.  8    is a perspective view of a transmissive portion corresponding to a single light-guiding plate unit  10  according to embodiments of the present disclosure, and  FIG.  9    is a top view of an orthographic projection of a transmissive portion on a plane where a light-guiding plate assembly is located. The second sub-transmissive-portion  122  surrounds the first sub-transmissive-portion  121 . In an example, the first sub-transmissive-portion  121  and the second sub-transmissive-portion  122  may be integrally molded. The first sub-transmissive-portion  121  and the second sub-transmissive-portion  122  do not include any boundary therebetween. 
     As shown in  FIG.  2   ,  FIG.  3    and  FIG.  10   ,  FIG.  10    is another perspective view of a transmissive portion according to embodiments of the present disclosure. The transmissive portion  12  is provided with a recessed structure  120  that recesses toward the light-exiting side  102  of the light-guiding plate assembly  1 . 
     As shown in  FIG.  3   , the light-emitting element  30  is disposed corresponding to the recessed structure  120 . The recessed structure  120  is provided to make the surface of the transmissive portion  12  facing the light-emitting element  30  form a lens structure. In this manner, the light emitted from the light-emitting element  30  can be diffused by the recessed structure  120  when passing through the recessed structure  120 , facilitating improving the uniformity of the light emitted from the light-guiding plate assembly  1  at each position. 
     In some embodiments, as shown in  FIG.  3   , a clearance is provided between the surface of the recessed structure  120  and the light-emitting element  30 . Such an arrangement facilitates the heat dissipation of the light-emitting element  30 . 
     As shown in  FIG.  3   , in the embodiments of the present disclosure, the surface of the recessed structure  120  facing the light-incidence side  101  of the light-guiding plate assembly  1  and the bottom surface of the reflective portion  11  may be provided on the same plane. In this manner, when the light-guiding plate assembly  1  and the light-emitting element  30  are fitted, the surface of the recessed structure  120  facing the light-guiding plate assembly  1  and the bottom surface of the light-emitting element  30  can be provided the same plane, the large-angle light emitted from the light-emitting element  30  can first pass through the recessed structure  120  to be diffused and then irradiate the side surface  112  of the reflective portion  11 , facilitating improving the uniformity of the large-angle light incident on the side surface  112  of the reflective portion  11 . 
     In an example, as shown in  FIG.  11   ,  FIG.  11    is schematic view of another light-guiding plate assembly  1  according to embodiments of the present disclosure. The surface of a recessed structure  120  is provided with a microstructure  130 . Referring to  FIG.  12   ,  FIG.  12    is a view of paths of light passing through the recessed structure  120  provided with the microstructure  130 . The microstructure  130  is provided to further diffuse light emitted from a light-emitting element  30 , so as to make the light emitted from the light-guiding plate assembly  1  be more uniform. In an example, as shown in  FIGS.  10  and  11   , the microstructure  130  may be in a shape of sawtooth. The shape of sawtooth may be V-shaped. 
     In an example, as shown in  FIG.  2   , the reflective portion  11  includes an end portion  110  facing the light-exiting side  102  of the light-guiding plate assembly  1 . The transmissive portion  12  includes a first surface  13  facing the light-exiting side of the light-guiding plate assembly  1 . The distance B 1  between the first surface  13  and the end portion  110  is greater than or equal to 0.3 mm. Such an arrangement can reduce the light condensing effect at the end portion  110  of the reflective portion  11  and improve the uniformity of the light emitted from the light-guiding plate assembly  1 . In addition, such an arrangement can make the transmissive portions  12  disposed corresponding to different light-guiding plate units  10  be connected to each other, that is, make multiple transmissive portions  12  disposed corresponding to the different light-emitting elements  30  together form a plate-like structure as shown in  FIG.  7   , facilitating an integral formation of the transmissive portions  12  disposed corresponding to the different light-emitting elements  30 , and facilitating the production and assembly of the backlight module including the light-guiding plate assembly  1 . 
     In an example, as shown in  FIG.  13   ,  FIG.  13    is another sectional view of a light-guiding plate assembly according to embodiments of the present disclosure. A light-guiding plate assembly  1  also includes a diffusion portion  4  located on a side of a transmissive portion  12  facing a light-exiting side  102  of the light-guiding plate assembly  1 . The diffusion portion  4  is provided to diffuse light emitted from a light-emitting element  30 , so as to make the light emitted from the light-guiding plate assembly  1  more uniform. 
     In an example, as shown in  FIG.  13   , at least part of the diffusion portion  4  is located on a side of a reflective portion  11  facing the light-exiting side  102  of the light-guiding plate assembly  1 . Such an arrangement can make the light reflected by the reflective portion  11  emit after being diffused by the diffusion portion  4 , improving the uniformity of the light emitted from the light-guiding plate assembly  1 . 
     As shown in  FIG.  14   ,  FIG.  14    is another sectional view of a light-guiding plate assembly according to embodiments of the present disclosure. A diffusion portion  4  includes a protruding structure  40  that protrudes from the transmissive portion  12  toward the light-exiting side  102  of the light-guiding plate assembly  1 . The protruding structure  40  is provided to diffuse light propagating therethrough, so as to make light emitted from different positions of the light-guiding plate assembly  1  more uniform. In an example, the protruding structure  40  includes dot-shaped protrusions and/or V-shaped protrusions. In the embodiments of the present disclosure, the diffusion portion  4  may be directly molded by preparing the V-shaped protrusions or the dot-shaped protrusions on the surface of the transmissive portion  12  through a molding die. 
     In an example, as shown in  FIGS.  13  and  14   , the diffusion portion  4  includes diffusion particles  41 . The diffusion particles  41  are disposed on a side of the transmissive portion  12  facing the light-exiting side  102  of the light-guiding plate assembly  1 . Such an arrangement saves the need for additionally disposing a diffusion sheet in the light-guiding plate assembly  1 , facilitating reducing the number of films in the light-guiding plate assembly  1 , reducing the costs, and reducing the thickness of the light-guiding plate assembly  1 . Moreover, due to that the number of films in the light-guiding plate assembly  1  is reduced, the relative friction among the films during the verification process of reliability can be correspondingly avoided, facilitating improving the reliability of the light-guiding plate assembly  1 . When the light-guiding plate assembly  1  is applied in the display device, during the verification process of the reliability of the display device, the problem of abnormal display of the display device caused by the relative movement between different film structures can be avoided. 
     In the embodiments of the present disclosure, the diffusion portion  4  and the transmissive portion  12  may be integrally molded to simplify the molding process of the light-guiding plate assembly  1 . In an example, the diffusion portion  4  may be prepared by a module insert injection molding process. In the preparation of the transmissive portion  12  of the light-guiding plate assembly  1 , the diffusion sheet, the diffusion plate or the diffusion particles, each of which have a diffusion function, may be first placed in the transmissive portion  12 , and then be molded through an in-mold injection process, so that the diffusion portion  4  is uniformly distributed in the transmission portion  12 . 
     In an example, the reflective portion  11  and the transmissive portion  12  may be separately prepared and then bonded by a colloid to improve the bonding firmness. 
     In other embodiments, the reflective portion  11  and the transmissive portion  12  in the embodiments of the present disclosure may be integrally molded to simplify the molding process of the light-guiding plate assembly  1  and improve the bonding firmness of the reflective portion  11  and the transmissive portion  12 . Moreover, in such an arrangement, a sealant for securing the reflective portion  11  and the transmissive portion  12  does not need to be provided, so that the bezel of the backlight module may be narrower when the light-guiding plate assembly  1  is applied to the backlight module. In an example, the reflective portion  11  and the transmissive portion  12  may be integrally molded through the injection molding process. 
     In an example, the reflective portion  11  includes a white material to improve the reflectance of the reflective portion  11 . In an example, the reflective portion  11  includes polymethyl methacrylate (PMMA) or polycarbonate (PC). 
     In an example, the transmissive portion  12  includes a transparent material, to ensure that the transmissive portion  12  has a higher transmissivity, and to ensure the light transmission effect of the transmissive portion  12 . 
     The embodiments of the present disclosure also provide a backlight module  100 . Referring to  FIGS.  3  and  15   ,  FIG.  15    is a laminating view of a backlight module  100  according to embodiments of the present disclosure. The backlight module  100  includes backlights  3  and the preceding light-guiding plate assembly  1 . The light-guiding plate assembly  1  is located on a light-exiting side of a backlight  3 . 
     When the backlight module  100  works, the backlight  3  emits light. The light emitted from the backlight  3  is guided by the light-guiding plate assembly  1  and emitted to a display panel (not shown) located on the light-exiting side of the light-guiding assembly  1 . 
     In the backlight module  100  provided by the embodiments of the present disclosure, the light-guiding plate assembly  1  is provided with the transmissive portion  12  and the reflective portion  11 , and the transmissive portion  12  is provided with the first sub-transmissive-portion  121  and the second sub-transmissive-portion  122 . In the direction h 1  perpendicular to the plane where the light-guiding plate assembly  1  is located, the first sub-transmissive-portion  121  does not overlap the reflective portion  11 . The second sub-transmissive-portion  122  is located on a side of the reflective portion  11  facing the light-exiting side of the light-guiding plate assembly  1 . In such arrangement, small-angle light emitted from the backlight  3  can be emitted through the first sub-transmissive-portion  121 , and large-angle light emitted from the backlight  3  can be reflected by the reflective portion  11 , so that the reflected light can be emitted through the second sub-transmissive-portion  122 , avoiding the large-angle light from irradiating other positions, avoiding mutual crosstalk of the light emitted from the backlights  3  located in different areas. Moreover, such an arrangement can improve the intensity of light emitted from the region where the reflective portion  11  is located in the light-guiding plate assembly  1 , balance the intensity of light emitted from the region where the first sub-transmissive-portion  121  is located and the intensity of light emitted from the region where the second sub-transmissive-portion  122  is located, facilitating improving the uniformity of the intensity of light emitted from different regions in the light-guiding plate assembly  1 . In addition, such an arrangement can improve the utilization rate of the large-angle light emitted from the backlight  3 , facilitating improving the brightness of the backlight module  100  and reducing the power consumption of the backlight module  100 . 
     In an example, as shown in  FIGS.  3  and  15   , the backlights  3  include multiple light-emitting elements  30 . The multiple light-emitting elements  30  are arranged in an array on the plane where the backlight module  100  is located. In an example, a light-emitting element  30  includes a mini-LED chip. 
     In an example, as shown in  FIGS.  3  and  15   , in the backlight module  100 , the reflective portion  11  in the light-guiding plate assembly  1  is disposed around a light-emitting element  30 . Such an arrangement can make the reflective portion  11  reflect more large-angle light emitted from the light-emitting element  11 , facilitating increasing the utilization rate of the light emitted from the light-emitting element  30  by the light-guiding plate assembly  1 . 
     In some embodiments, as shown in  FIG.  3   , in the direction parallel to the plane where the light-guiding plate assembly  1  is located, the reflective portion  11  at least partially overlaps the light-emitting element  30 . That is, the light-emitting element  30  may be at least partially embedded in the light-guiding plate assembly  1 . Such an arrangement facilitates the thin design of the backlight module  100 . 
     In an example, as shown in  FIG.  3   , the light-emitting element  30  is located on a side of the first sub-transmissive-portion  121  facing the light-exiting side  101  of the light-guiding plate assembly  1 . When the backlight module  100  works, the small-angle light emitted from the light-emitting element  30  may exit from the light-guiding plate assembly  1  through the first sub-transmissive-portion  121 . 
     In an example, as shown in  FIG.  3   , the transmissive portion  12  is provided with a recessed structure  120  that recesses toward the light-exiting side of the light-guiding plate assembly  1 . In the direction parallel to the plane where the light-guiding plate assembly  1  is located, the light-emitting element  30  at least partially overlaps the recessed structure  120 . Part of the large-angle light propagating in the direction parallel to the plane where the light-guiding plate assembly  1  is located passes through the surface of the recessed structure  120  in the process of propagation, and the surface of the recessed structure  120  can diffuse the light emitted from the light-emitting element  30 . In this manner, the intensity of light emitted from the single light-emitting element  30  can be balanced at different positions, and the local over-brightness problem of the backlight module  100  can be alleviated. Moreover, in such an arrangement, the light-emitting element  30  is at least partially embedded in the light-guiding plate assembly  1 , making the thickness of the backlight module  100  thinner, and facilitating the thin design of the backlight module  100 . 
     In an example, as shown in  FIG.  3   , an included angle β is provided between a reflective surface  112  of the reflective portion  11  and a light-emitting surface of the light-emitting element  30 . In the embodiments of the present disclosure, 90°&lt;β&lt;180°. In an example, β is complementary to a which is an included angle between the reflective surface  112  and the bottom surface  111  of the reflective portion  11 . In, such an arrangement, the large-angle light emitted from the light-emitting element  30  exits after being reflected by the reflective portion  11 , avoiding the mutual crosstalk between the light emitted from the different light-emitting elements  30 . Moreover, in such an arrangement, for the small-angle light emitted from the light-emitting element  30 , the amount of small-angle light reflected by the reflective portion  11  can be reduced, enabling more small-angle light to directly exit from the light-guiding plate assembly  1  through the transmissive portion  12 . 
     In an example, as shown in  FIG.  3   , in the direction parallel to the plane where the light-guiding plate assembly  1  is located, the shortest distance B 2  between the reflective portion  11  and the light-emitting element  30  is equal to or greater than 0.7 mm. That is, the light-emitting element  30  is provided to not overlap the reflective portion  11 , to ensure that the light-guiding plate assembly  1  and the light-emitting element  30  can be smooth assembled. 
     In an example, as shown in  FIG.  15   , the backlight module  100  also includes a printed circuit board (PCB)  31  including a circuit (not shown) electrically connected to the light-emitting element  30 . The PCB  31  is provided to control the lighting of the light-emitting element  30 . 
     Embodiments of the present disclosure also provide a display device, as shown in  FIG.  16   ,  FIG.  16    is a sectional diagram of a display device  1000  according to embodiments of the present disclosure. The display device  1000  includes an imaging component  5  and the preceding backlight module  100 . In an example, the imaging component  5  includes a liquid crystal display panel. When the display device works, the backlight module  100  emits light, so as to make the display device display images. The structure of the backlight module  100  has been described in detail in the preceding embodiments and is not repeated herein. In an example, the display device may be any electronic device having a display function, such as a mobile phone, a tablet, a laptop, an E-ink book or a television. 
     In an example, as shown in  FIG.  16   , the display device  1000  also includes an optical component  7  located between the imaging component  5  and the light-guiding plate assembly  1 . The optical component  7  is provided to adjust light emitted from the light-guiding plate assembly  1  toward the display panel. In an example, the optical component  7  includes a brightness enhancing film. 
     In the embodiments of the present disclosure, the light-guiding plate assembly  1  may be used as a bearing structure for the optical component  7 . In such an arrangement, the deformation such as concaving downward of the optical component  7  during the reliability test can be avoided, facilitating the reliability of the optical component  7  and the light-emitting effect of the backlight module  100 . 
     In some embodiments, as shown in  FIG.  17   ,  FIG.  17    is a top view of a display device facing away from a light-exiting side according to embodiments of the present disclosure. The display device  1000  also includes stoppers  6 . The light-guiding plate assembly  1  is detachably connected to the optical component  7  through the stoppers  6 . 
     In an example, as shown in  FIG.  17   , the imaging component  5  includes a first edge  51  and a second edge  52 . The length of the first edge  51  is greater than the length of the second edge  52 . The extension direction of the first edge  51  is parallel to a first direction h 21 . The stoppers  6  include a first stopper  61 , a second stopper  62  and a third stopper  63 . The first stopper  61 , the second stopper  62  and the third stopper  63  are arranged in a first direction h 21 . The second stopper  62  is located between the first stopper  61  and the third stopper  63 . When the imaging component  5  expands and deforms in a high temperature environment or other environments, the length of the first edge  51 , which having a longer length in the imaging component  5 , varies more. In the embodiments of the present disclosure, the first stopper  61 , the second stopper  62  and the third stopper  63  are arranged in the first direction h 21 . That is, the first stopper  61 , the second stopper  62  and the third stopper  63  are arranged in a direction of a longer side of the imaging component  5 . In this manner, when the optical component  7  expands and deforms, the first stopper  61 , the second stopper  62  and the third stopper  63  are provided to ensure that the position of the light-guiding plate assembly  1  with respect to the optical component  7  does not change, facilitating the structural stability of the display device  1000 . 
     As shown in  FIG.  17   , in the embodiments of the present disclosure, a first clearance D 1  is provided between the first stopper  61  and the optical component  7 , and D 1 ≥0.1 mm, to achieve a better detachable connection between the first stopper  61  and the optical component  7 . 
     In an example, as shown in  FIG.  17   , the length L 1  of the optical component  7  in the first direction h 21  is L 1 . The expansion rate of the optical component is C. In the first direction h 21 , a second clearance D 2  is provided between the second stopper  62  and the optical component  7 . D 2 ≥L 1 ×C/2. In the embodiments of the present disclosure, the second clearance D 2  is provided between the second stopper  62  and the optical component  7  in the first direction h 21 , ensuring that when the optical component  7  is deformed in the high temperature environment or other environments, squeezing or the like would not occur between the first stopper  61  and the optical component  7  in the first direction h 21 , which achieves a better detachable connection between the second stopper  62  and the optical component  7  in the first direction h 21 . 
     In an example, as shown in  FIG.  17   , in a second direction h 22 , a third clearance D 3  is provided between the second stopper  62  and the optical component  62 . In the embodiments of the present disclosure, D 3 ≥0.1 mm. The second direction h 22  is parallel to the extension direction of the second edge  52 . In such an arrangement, a better detachable connection between the first stopper  61  and the optical component  7  in the second direction h 22  can be achieved. 
     In an example, as shown in  FIG.  17   , in the first direction h 21 , a fourth clearance D 4  is provided between the third stopper  63  and the optical component  7 . In the embodiments of the present disclosure, D 4 ≥L 1 ×C/2. In the embodiments of the present disclosure, the fourth clearance D 4  is provided between the third stopper  63  and the optical component  7  in the first direction h 21 , ensuring that when the optical component  7  is deformed in the high temperature environment or other environments, squeezing or the like would not occur between the third stopper  63  and the optical component  7  in the first direction h 21 , which achieves a better detachable connection between the third stopper  63  and the optical component  7  in the first direction h 21 . 
     In an example, as shown in  FIG.  17   , in the second direction h 22 , a fifth clearance D 5  is provided between the third stopper  63  and the optical component  7 . In the embodiments of the present disclosure, D 5 ≥0.1 mm. In such an arrangement, a better detachable connection between the first stopper  61  and the optical component  7  in the second direction h 22  is achieved. 
     As shown in  FIG.  16   , the display device  1000  also includes a sheet metal  91  and a sealant  92 . The backlight module  100  is fitted with the imaging component  5  through the sealant  92 . The sheet metal  91  is used to bear the imaging component  5 .