Patent Publication Number: US-2023165120-A1

Title: Display substrate and display apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a national phase entry under 35 U.S.C § 371 of International Application No. PCT/CN2021/077249, filed Feb. 22, 2021. 
    
    
     FIELD 
     The present disclosure relates to the field of display, in particular to a display substrate and a display apparatus. 
     BACKGROUND 
     With constant development of a terminal technology, an electronic device is applied wider and wider. In order to protect information security of a user, a fingerprint recognition function is used on the electronic device more and more popular, for example, used for mobile phone unlocking, mobile payment (such as payment and transfer of account), etc. 
     SUMMARY 
     Embodiments of the present disclosure provide a display substrate and a display apparatus. The solutions are as follows. 
     On the one hand, the embodiments of the present disclosure provide a display substrate, including: 
     a base substrate; 
     a plurality of light-emitting devices, arranged on the base substrate; 
     a plurality of photosensitive devices, arranged between a layer where the plurality of light-emitting devices are located and the base substrate, wherein orthographic projections, on the base substrate, of the plurality of photosensitive devices are at gaps of adjacent orthographic projections, on the base substrate, of the plurality of light-emitting devices; and 
     a plurality of color filters and a black matrix, arranged on a side, facing away from the base substrate, of the layer where the plurality of light-emitting devices are located, wherein the black matrix has a plurality of first openings and a plurality of second openings, the plurality of color filters are correspondingly arranged in the plurality of first openings and cover the plurality of light-emitting devices, and orthographic projections, on the base substrate, of the plurality of second openings are overlapped with the orthographic projections, on the base substrate, of the plurality of photosensitive devices. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, at least one second opening is arranged corresponding to a respective one of the photosensitive devices. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, an orthographic projection, on the base substrate, of the second opening is covered by an orthographic projection, on the base substrate, of the respective one photosensitive device. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, a shape of the second opening is roughly a circle or a regular polygon. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, a pore diameter, when the second opening is the circle, of the second opening is 2 μm-20 μm; or a length of a diagonal line, when the second opening is the regular polygon, of the second opening is 2μm-20 μm. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, in a direction perpendicular to the base substrate, a thickness of the black matrix is 1 μm-5 μm. 
     Optionally, the above display substrate provided by the embodiments of the present disclosure further includes: a plurality of convex lenses arranged on a side, away from the base substrate, of the black matrix; and 
     the convex lenses and the second openings are arranged in a one-to-one correspondence mode, convex faces of the convex lenses face away from the photosensitive devices, and the convex lenses are configured to converge light rays, within a preset angle range, reflected by fingers to the photosensitive devices via the second openings. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, orthographic projections, on the base substrate, of the convex lenses completely cover the orthographic projections, on the base substrate, of the second openings. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, centers of the orthographic projections, on the base substrate, of the convex lenses are coincided with centers of the orthographic projections, on the base substrate, of the second openings. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, each of the convex lenses is configured to converge light rays with different angles within the preset angle range to at least two intersection points, an orthographic projection, on the base substrate, of one of the intersection points is coincided with a centers of an orthographic projection, on the base substrate, of the each convex lenses, and orthographic projections, on the base substrate, of the rest of intersection points shift a distance relative to the centers of the orthographic projections, on the base substrate, of the each convex lenses. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, a refractive index of the convex lenses is 1.6-1.8, and a curvature radius of the convex lenses is 5 μm-20 μm. 
     Optionally, the above display substrate provided by the embodiments of the present disclosure further includes: a transparent bonding layer arranged on a side, facing away from the base substrate, of a layer where the plurality of convex lenses are located, and a refractive index of the transparent bonding layer is smaller than the refractive index of the convex lenses. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, the refractive index of the transparent bonding layer is 1.35-1.45. 
     Optionally, the above display substrate provided by the embodiments of the present disclosure further includes: a plurality of light-filtering structures, one light-filtering structure is arranged in each second opening, and the plurality of light-filtering structures are configured to filter infrared light rays. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, a material of the light-filtering structures is green resin. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, a surface, away from the base substrate, of the light-filtering structures is flush with a surface, away from the base substrate, of the black matrix. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, a distance from a surface, away from the base substrate, of the light-filtering structures to the base substrate is smaller than or greater than a distance from a surface, away from the base substrate, of the black matrix to the base substrate. 
     Optionally, the above display substrate provided by the embodiments of the present disclosure further includes: a light-shading layer arranged on a side, facing the base substrate, of the black matrix, and the light-shading layer has a plurality of third openings; and 
     the plurality of third openings and the plurality of second openings are in one-to-one correspondence, and orthographic projections, on the base substrate, of the third openings and the orthographic projections, on the base substrate, of the second openings are at least partially coincided. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, the orthographic projections, on the base substrate, of the third openings are in orthographic projections, on the base substrate, of the second openings corresponding to the third openings, and centers of the orthographic projections, on the base substrate, of the third openings are coincided with centers of the orthographic projections, on the base substrate, of the corresponding second openings corresponding to the third openings. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, a shape of the third openings is roughly a circle or a regular polygon. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, pore diameters, when the third openings are the circle, of the third openings are 2 μm-10 μm; or lengths of diagonal lines, when the third openings are the regular polygon, of the third openings are 2 μm-10 μm. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, in the direction perpendicular to the base substrate, a thickness of the light-shading layer is 3000 Å-2 μm. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, a material of the light-shading layer is metal, and the thickness of the light-shading layer is 3000 Å-5000 Å. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, a material of the light-shading layer is same as a material of the black matrix, and the thickness of the light-shading layer is 0.5 μm-2 μm. 
     Optionally, the above display substrate provided by the embodiments of the present disclosure further includes: an encapsulation layer arranged between the layer where the plurality of light-emitting devices are located and a layer where the plurality of color filters are located; and 
     the light-shading layer is between a layer where first electrodes of the light-emitting devices are located and the encapsulation layer. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, the light-shading layer and second electrodes of the light-emitting devices are arranged on the same layer. 
     On the other hand, the embodiments of the present disclosure further provide a display apparatus, including the above display substrate. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic structural diagram of a display substrate provided by an embodiment of the present disclosure. 
         FIG.  2    is a schematic diagram of a sectional structure along a line I-II in  FIG.  1   . 
         FIG.  3    is a schematic structural diagram of a Z 1  region in  FIG.  2   . 
         FIG.  4    is a schematic diagram of light ray converging provided by an embodiment of the present disclosure. 
         FIG.  5    is a schematic diagram of another sectional structure along a line I-II in  FIG.  1   . 
         FIG.  6    is a schematic structural diagram of a Z 2  region in  FIG.  5   . 
         FIG.  7    is a schematic diagram of another sectional structure along a line I-II in  FIG.  1   . 
         FIG.  8    is a schematic structural diagram of a Z 3  region in  FIG.  7   . 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     In order to make the objective, solutions and advantages of the embodiments of the present disclosure more clear, the solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It should be noted that the sizes and shapes of all graphs in the drawings do not reflect the true scale, and only intend to illustrate the content of the present disclosure. The same or similar reference numbers represent the same or similar elements or elements with the same or similar functions from beginning to end. Obviously, the described embodiments are part of the embodiments of the present disclosure, but not all the embodiments. On the basis of the described embodiments of the present disclosure, all other embodiments obtained by those ordinarily skilled in the art without inventive efforts fall within the protection scope of the present disclosure. 
     Unless otherwise defined, the technical or scientific terms used here shall have usual meanings understood by a person of ordinary skill in the art to which the present disclosure belongs. The words “first”, “second” and the like used in the specification and claim of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. The word “including” or “comprising” and the like, means that an element or item preceding the word comprises an element or item listed after the word and the equivalent thereof, without excluding other elements or items. The words “inner”, “outer”, “upper”, “lower” and the like are only configured to indicate the relative positional relationship. When the absolute position of a described object changes, the relative positional relationship may also change accordingly. 
     In an Organic Light-Emitting Diode (OLED) display screen, a solution of Color Filter On Encapsulation (COE) may utilizes a color film to replace a polarizer, so that the OLED display screen has the characteristics of being higher in integration and thinner, and a large amount of production cost is saved. 
     An under-screen fingerprint recognition technology may integrate a fingerprint collecting module on a back face (namely, an opposite side of a display face) of the display screen without occupy a display region of the display screen, therefore, the under-screen fingerprint recognition technology has become an important implementation mode of fingerprint recognition. However, when the under-screen fingerprint recognition technology is applied to the OLED display screen based on a COE technology, because the color film includes a color filter and a black matrix (BM), existence of the black matrix causes significant reducing of light transmittance of the OLED display screen, and the under-screen fingerprint collecting module cannot sense a clear fingerprint signal. 
     In order to at least solve the above technical problem existing in the related technology, the embodiments of the present disclosure provide a display substrate, as shown in  FIG.  1    to  FIG.  3   , which may include: 
     a base substrate  101 ; 
     a plurality of light-emitting devices  102 , arranged on the base substrate  101 ; 
     a plurality of photosensitive devices  103 , arranged between a layer where the plurality of light-emitting devices  102  are located and the base substrate  101 , wherein orthographic projections, on the base substrate  101 , of the plurality of photosensitive devices  103  are at gaps of adjacent orthographic projections, on the base substrate  101 , of the plurality of light-emitting devices  102 ; and 
     a plurality of color filters  104  and a black matrix  105 , arranged on a side, facing away from the base substrate  101 , of the layer where the plurality of light-emitting devices  102  are located, and the black matrix  105  has a plurality of first openings O 1  and a plurality of second openings O 2 , the plurality of color filters  104  are correspondingly arranged in the plurality of first openings O 1  and cover the plurality of light-emitting devices  102 , and orthographic projections, on the base substrate  101 , of the plurality of second openings O 2  are overlapped with the orthographic projections, on the base substrate  101 , of the plurality of photosensitive devices  103 . 
     In the above display substrate provided by the embodiments of the present disclosure, by arranging the plurality of second openings O 2  mutually overlapped with the plurality of photosensitive devices  103  in the black matrix  105 , transmittance of light rays reflected by fingerprints is effectively improved. Moreover, by integrating the photosensitive devices  103  in the display substrate, compared with a relevant solution that a photosensitive device  103  is located below the display substrate, a propagation path of the light rays reflected by the fingerprints is greatly shortened, and light energy loss is reduced. Therefore, by adopting the above technical solution provided by the present disclosure, clarity of fingerprint recognition can be effectively improved. In addition, because the photosensitive devices  103  are arranged at the gap of the adjacent light-emitting devices  102 , the existence of the photosensitive device  103  does not affect light emitting of the light-emitting devices  102 , so as to ensure a display effect. 
     In some embodiments, as shown in  FIG.  2    and  FIG.  3   , the light-emitting devices  102  may include first electrodes  1021 , light-emitting functional layers  1022  and second electrodes  1023 ; the light-emitting functional layers  1022  include but are not limited to a hole injection layer, a hole transmission layer, an electron blocking layer, a light-emitting material layer, a hole blocking layer, an electron transmission layer and an electron injection layer. Specifically, the light-emitting functional layers  1022  may be a red light-emitting functional layer EL R , a green light-emitting functional layer EL G  and a blue light-emitting functional layer EL B . Accordingly, the color filters  104  may include a red color filter CF R , a green color filter CF G  and a blue color filter CF B . In addition, the photosensitive devices  103  may include bottom electrodes  1031 , top electrodes  1032  and PIN structures arranged between the bottom electrodes  1031  and the top electrodes  1032 . The PIN structures may include P-type semiconductor layers, intrinsic semiconductor layers I and N-type semiconductor layers. The P-type semiconductor layers are located between the bottom electrodes  1031  and the intrinsic semiconductor layers I, and the N-type semiconductor layers are located between the intrinsic semiconductor layers I and the top electrodes  1032 ; or the N-type semiconductor layers are located between the bottom electrodes  1031  and the intrinsic semiconductor layers I, and the p-type semiconductor layers are located between the intrinsic semiconductor layers I and the top electrodes  1032 . 
     It should be noted that in the present disclosure, the color filters  104  are arranged over the light-emitting devices  102 , the black matrix  105  is arranged over the gap between the adjacent light-emitting devices  102 ,  FIG.  1    schematically gives an arrangement mode (equivalent to an arrangement mode of the light-emitting devices  102 ) of the color filters  104 , during implementation, it may be other arrangement modes known by those skilled in the art, which is not limited here. In addition,  FIG.  1    only shows that column gaps of the light-emitting devices  102  have the photosensitive devices  103  (a position corresponding to the second openings O 2 ). In some embodiments, the photosensitive devices  103  may further be arranged at the row gaps of the light-emitting devices  102 . 
     optionally, in the above display substrate provided by the embodiments of the present disclosure, as shown in  FIG.  3   , the at least one second openings O 2  may be arranged to be corresponding to a respective one of the photosensitive devices  103 , that is, one or more second openings O 2  may be arranged above one photosensitive device  103 , so that the light transmittance of a position where each photosensitive device  103  is located is improved due to the second openings O 2 , thereby improving a fingerprint recognition effect. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, as shown in  FIG.  3   , an orthographic projection, on the base substrate  101 , of the at least one second opening O 2  is in an orthographic projection, on the base substrate  101 , of the respective one photosensitive device  103 . The photosensitive devices  103  can convert received light rays into electric signals to achieve a fingerprint recognition function. By setting the orthographic projection, on the base substrate  101 , of the second opening O 2  be located in the orthographic projections, on the base substrate  101 , of the respective one photosensitive device  103 , light rays transmitted through the second openings O 2  may all be irradiated onto the photosensitive devices  103 , so that intensity of the light rays received by the photosensitive devices  103  may be improved, thereby providing an obvious electric signal, and ensuring fingerprint clarity. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, because large-angle light rays will interfere fingerprint recognition, in order to ensure that approximately collimated small-angle light rays (for example, light rays L 1 -L 2  in a θ range as shown in  FIG.  2   ) penetrate through the second openings O 2  to be irradiated to the photosensitive devices  103 , as shown in  FIG.  1    and  FIG.  3   , with reference to display screens with different resolutions, a shape of the second openings O 2  may be set roughly be a circle or a regular polygon (such as a regular hexagon and the like), and a pore diameter d 1 , when the second opening O 2  is the circle, of the second opening is 2 μm-20; or a length of a diagonal line, when the second opening O 2  is the regular polygon, of the second opening is 2 μm-20 μm. 
     It should be noted that the greater the resolution of the display screen is, the smaller a line width of the black matrix  105  is, and accordingly, the smaller a size of the second openings O 2  is. In addition, in some embodiments, the shape of the second openings O 2  may also be a square or other shapes, as long as a function of transmitting the small-angle light rays can be achieved. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, as shown in  FIG.  3   , in a direction perpendicular to the base substrate  101 , a thickness h 1  of the black matrix  105  is 1 μm-5 μm. Under this thickness, the black matrix  105  can make the light transmittance of the light rays within a range of 400 nm-850 nm to be 0.1% or below, that is, can effectively intercept the light rays within the range of 400 nm-850 nm, so as to avoid crosstalk of emergent light rays of the adjacent color filters  104 . 
     Optionally, the above display substrate provided by the embodiments of the present disclosure, as shown in  FIG.  2    and  FIG.  3   , may further include: a plurality of convex lenses  106  arranged on a side, away from the base substrate  101 , of the black matrix  105 . The convex lenses  106  and the second openings O 2  are arranged in a one-to-one correspondence mode, convex faces of the convex lenses  106  face away from the photosensitive devices  103 , and the convex lenses  106  are configured to converge light rays L 1 -L 2 , within a preset angle θ (such as 10°) range, reflected by fingers to the photosensitive devices  103  via the second openings O 2 , thereby further ensuring that the approximately-collimated small-angle light rays are irradiated to the photosensitive devices  103 , and thus improving accuracy of fingerprint recognition. 
     Optionally, the above display substrate provided by the embodiments of the present disclosure, as shown in  FIG.  2    and  FIG.  3   , orthographic projections, on the base substrate  101 , of the convex lenses  106  completely cover the orthographic projections, on the base substrate  101 , of the corresponding second openings O 2 , so as to ensure that all the light rays L 1 -L 2  within the preset angle θ (such as 10°) range can be converged by the convex lenses  106  and irradiated to the photosensitive devices  103  through the second openings O 2 . 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, centers of the orthographic projections, on the base substrate  101 , of the convex lenses  106  are coincided with centers of the orthographic projections, on the base substrate  101 , of the corresponding second openings O 2 . By setting the centers of the orthographic projections, on the base substrate  101 , of the convex lenses  106  be coincided with the centers of the orthographic projections of the second openings O 2  completely covered with the convex lenses  106 , the second openings O 2  with the small size may also completely transmit the converged light rays of the convex lenses  106  to the photosensitive devices  103 , so as to effectively ensure a collimation effect of fingerprint reflected light on the basis of improving a fingerprint reflected light intensity received by the photosensitive devices  103 . 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, as shown in  FIG.  4   , each of the convex lenses  106  may converge light rays L 1  (such as an included angle with a vertical direction being 0°), L 3  (such as the included angle with the vertical direction being 3°), L 4  (such as the included angle with the vertical direction being 5°) and L 2  (such as the included angle with the vertical direction being 10°) with different angles within the preset angle θ (such as 10°) range to at least two intersection points (such as four intersection points a, b, c and d), an orthographic projection, on the base substrate  101 , of one of the intersection points (such as the intersection point a) is coincided with a center e of an orthographic projection, on the base substrate  101 , of the each convex lenses  106 , and orthographic projections, on the base substrate  101 , of the rest of intersection points (such as the three intersection points b, c and d) shift a distance relative to the center e of the orthographic projection, on the base substrate  101 , of the each convex lenses  106 . The distance is related to the angles of the light rays and a refractive index of the convex lenses  106 , the larger the angle of the light rays is, the large a distance from the intersection point converged by the convex lenses  106  to the centers e of the orthographic projections of the convex lenses  106  is. 
     It can be seen from  FIG.  4    that on the basis that the convex lenses  106  converge the light rays L 1  (such as the included angle with the vertical direction being 0°), L 3  (such as the included angle with the vertical direction being 3°), L 4  (such as the included angle with the vertical direction being 5°) and L 2  (such as the included angle with the vertical direction being 10°) with the different angles within the preset angle θ (such as 10°) range to the at least two intersection points (such as the four intersection points a, b, c and d), a light-shading layer  110  may be additionally arranged to selectively transmit the light rays with the different angles. For example, the light-shading layer  110  in  FIG.  4    may selectively shade the intersection point (such as the intersection point d) of the large-angle light ray (such as L 2 ), and selectively transmit the small-angle light rays (such as L 1 , L 3  and L 4 ), so as to further improve a collimation effect. 
     Optionally, in the above display substrate provided by embodiments of the present disclosure, the refractive index of the convex lenses  106  may be 1.6-1.8, and a curvature radius r of the convex lenses  106  may be 5 μm-20 μm, as shown in  FIG.  2   . The convex lenses  106  with the large refractive index have a good converging effect on the light rays, and the curvature radius within the above range can meet different product demands. Accordingly, the curvature radius r within the above range can ensure that an upper surface of the photosensitive devices  103  is in the neighborhood of a focal point of the convex lenses  106 . 
     Optionally, the above display substrate provided by the embodiments of the present disclosure, as shown in  FIG.  2    and  FIG.  3   , may further include: a transparent bonding layer  107  arranged on a side, facing away from the base substrate  101 , of a layer where the plurality of convex lenses  106  are located, and a refractive index of the transparent bonding layer  107  is smaller than the refractive index of the convex lenses  106 , so as to match the refractive index of the convex lenses  106 . Meanwhile, the transparent bonding layers  107  are further configured to bond and fix a protective cover plate  104  with the color filters  104 , the black matrix  105  and the convex lenses  106 . 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, in order to match the refractive index of the convex lenses  106  better, the refractive index of the transparent bonding layers  107  may be 1.35-1.45. In some embodiments, the transparent bonding layers  107  may be optically clear adhesive (OCA). 
     Optionally, the above display substrate provided by the embodiments of the present disclosure, as shown in  FIG.  2    and  FIG.  3   , may further include: a plurality of light-filtering structures  109 , one light-filtering structure  109  is arranged in each second opening O 2 , and the plurality of light-filtering structures  109  are configured to filter infrared light rays. 
     Because in a fingerprint recognition process, light emitted by the light-emitting devices  102  may be sensed by the photosensitive devices  103  after being reflected by the fingerprints, in addition, the photosensitive devices  103  may further sense ambient light incident through the fingers. The ambient light may generate interference on the fingerprint recognition of the photosensitive devices  103 . For example, when the ambient light is irradiated over the fingers, the ambient light penetrate through the fingers and stimulate biological tissues in the fingers to emit pigment light, and the pigment light may generate the interference on the fingerprint recognition. Through detection, the pigment light mainly includes light with a wavelength being 600 nm or above. Therefore, the light-filtering structures  109  arranged at the second openings O 2  may effectively avoid influence of the ambient light by intercept the infrared light rays, thereby achieving an effect of accurate fingerprint recognition under an outdoor sunlight environment. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, a material of the light-filtering structures  109  may be green resin. The green resin is a material of green color filter CF G , and can effectively intercept the light rays of 580 nm-850 nm. Certainly, during specific implementation, the light-filtering structures  109  may further be manufactured by selecting other materials other than the green resin, as long as a function of cutting-off the infrared light rays can be achieved. 
     It should be noted that when a cutting-off effect of the infrared light rays is achieved, the light-filtering structures with different materials needs different thicknesses, so that reserved spaces in the second openings O 2  are different. Therefore, in some embodiments, a surface, away from the base substrate  101 , of the light-filtering structures  109  is flush with a surface, away from the base substrate  101 , of the black matrix  105 , that is, the light-filtering structures  109  exactly fill the second openings O 2 . At this time, bottoms of the convex lenses  106  and an upper surface of the black matrix  105  are exactly arranged in a co-planar arrangement. In some other embodiments, a distance from the surface, away from the base substrate  101 , of the light-filtering structures  109  to the base substrate  101  may be smaller than or greater than a distance from the surface, away from the base substrate  101 , of the black matrix  105  to the base substrate  101 . That is, the light-filtering structures  109  do not yet fill or overflows the second openings O 2 . Accordingly, the bottoms of the convex lenses  106  are embedded into the second openings O 2  or are higher than the upper surface of the black matrix  105 . 
     It can be known from the above description that the above display substrate provided by the embodiments of the present disclosure can utilize the approximately-collimated small-angle light rays for fingerprint recognition. However, in the fingerprint recognition process, some large-angle crosstalk light rays L 5  occur inevitably. In some embodiments, the crosstalk light rays L 5  can be blocked by the black matrix  105 , as shown in  FIG.  2   . But in some embodiments, the crosstalk light rays L 5  are not effectively intercepted by the black matrix  105 , as shown in  FIG.  5   . 
     Based on this, in order to effectively intercept the crosstalk light rays L 5 , in the above display substrate provided by the embodiments of the present disclosure, as shown in  FIG.  5    and  FIG.  6   , a light-shading layer  110  may further be arranged on a side, facing the base substrate  110 , of the black matrix  105 . The light-shading layer  110  has a plurality of third openings O 3 . The plurality of third openings O 3  and the plurality of second openings O 2  are in one-to-one correspondence, and orthographic projections, on the base substrate  101 , of the third openings O 3  and the orthographic projections, on the base substrate  101 , of the second openings O 2  are at least partially coincided. It can be seen from  FIG.  5   , the light-shading layer  110  can play a role in intercepting the crosstalk light rays L 5 . The third openings O 3  and the second openings O 2  are correspondingly overlapped, a collimating effect can be achieved on the small-angle light rays L 1 , L 3  and L 4 , thereby improving the fingerprint recognition effect advantageously. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, as shown in  FIG.  5    and  FIG.  6   , in order to obtain the good collimating effect, the orthographic projections, on the base substrate  101 , of the third openings O 3  may be arranged to be in the orthographic projections, on the base substrate  101 , of the second openings O 2  corresponding to the third openings, and centers of the orthographic projections, on the base substrate  101 , of the third openings O 3  are coincided with the centers of the orthographic projections, on the base substrate  101 , of the second openings O 2  corresponding to the third openings. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, in order to guarantee the collimation effect, a shape of the third openings O 3  may be roughly a circle or a regular polygon (such as a regular hexagon), and pore diameters, when the third openings O 3  are the circle, of the third openings are 2 μm-10 μm; or lengths of diagonal lines, when the third openings O 3  are the regular polygon, of the third opening are 2 μm-10 μm. In addition, in some embodiments, the shape of the third openings O 3  may also be a square or other shapes, as long as the function of collimating the small-angle light rays can be achieved. 
     Optionally, in the above display substrate provided by the embodiment of the present disclosure, as shown in  FIG.  5   , in the direction perpendicular to the base substrate  101 , a thickness h 2  of the light-shading layer  110  is 3000 Å-2 μm. Under this thickness, the light-shading layer  110  can make the light transmittance of a crosstalk light ray L 3  within a range of 400 nm-850 nm less than 0.1%, that is, can effectively intercept the crosstalk light ray L 3  within the range of 400 nm-850 nm, so as to avoid influence of the crosstalk light ray L 3  on fingerprint recognition. 
     In some embodiments, the light-shading layer  110  may be manufactured by using light absorbing or low-reflectivity material such as the black matrix (BM) and molybdenum metal (Mu), so as to reduce a degree of reflecting of the large-angle crosstalk light ray L 3  on the light-shading layer  110 , thereby improving the accuracy of the fingerprint recognition. 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, when a material of the light-shading layer is metal, the thickness of the light-shading layer  110  may be set to be 3000 Å-5000 Å in order to effectively intercept the crosstalk light ray L 3 . 
     Optionally, in the above display substrate provided by the embodiments of the present disclosure, when the material of the light-shading layer  110  is same as a material of the black matrix  105  are the same, the thickness of the light-shading layer  110  may be set to be 0.5 μm-2 μm in order to effectively intercept the crosstalk light ray L 3 . 
     Optionally, the above display substrate provided by the embodiments of the present disclosure, as shown in  FIG.  6   , may further include: an encapsulation layer  111  located between the layer where the plurality of light-emitting devices  102  are located and a layer where the plurality of color filters  104  are located; and the light-shading layer  110  may be located between the first electrodes  1021  of the light-emitting devices  102  and the encapsulation layer  111 . Or, as shown in  FIG.  7    and  FIG.  8   , the light-shading layer  110  and the second electrodes  1023  of the light-emitting devices  102  may be arranged on the same layer. Optionally, the second electrodes  1023  may be anodes, and the first electrodes  1021  may be cathodes. 
     It should be noted that in the present disclosure, the “same layer” refers to a layer structure formed by utilizing the same mask through a single mask patterning process after a film layer for manufacturing specific graphics is formed by adopting the same film forming process. That is, the single mask patterning process corresponds to one mask (also called a photomask). According to the different specific graphics, the single mask patterning process may include a plurality of exposure, developing or etching processes, while the specific graphics in the formed layer structure may be continuous or discontinuous, and these specific graphics may be arranged at the same height or have the same thickness, or may be at the different heights or have the different thicknesses. It can be seen that in the case that the light-shading layer  110  and the second electrodes  1023  of the light-emitting devices  102  are arranged on the same layer, the light-shading layer  110  may be prevented from being separately arranged, thereby reducing the quantity of the film layers, facilitating achievement of thinning design, and saving a cost. 
     Generally, the above display substrate provided by the embodiment of the present disclosure, as shown in  FIG.  2    to  FIG.  8   , may further include: a heat radiation film  112 , a buffer layer  113 , a gate insulating layer  114 , an interlayer dielectric layer  115 , a flattening layer  116 , a bias line  117 , a transfer electrode  118 , a first transistor TFT 1  and a second transistor TFT 2 , and the like. It should be understood by a person of ordinary skill in the art that the display substrate should have other essential constituent parts, which is not repeated here and should not be regarded as limitation to the present invention. 
     Based on the same inventive concept, the present disclosure further provides a display apparatus, including the above display substrate provided by the embodiments of the present disclosure. The display substrate may be an OLED display substrate. Principles of the display apparatus for solving the problems are similar to that of the above display substrate, therefore, implementation of the display apparatus may refer to the embodiments of the above display substrate, and repetitions are omitted. 
     In some embodiments, the above display apparatus provided by the embodiments of the present disclosure may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a displayer, a notebook computer, a digital photo frame, a navigator, a smart watch, a fitness wristband and a personal digital assistant. The above display apparatus provided by the embodiments of the present disclosure may further include but not limited to: a radio frequency unit, a network module, an audio output unit, an input unit, a sensor, a display unit, a user input unit, an interface unit, a memory, a processor, a power supply and other components. Those skilled in the art may understand that composition of the above display apparatus does not form limitation to the display apparatus, and the display apparatus may include the above more or less components, or combine certain components, or different component arrangements. 
     Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. In this way, if these modifications and variations of the embodiments of the present invention and their equivalent art, the present invention also intends to include these modifications and variations.