Patent Publication Number: US-2023140596-A1

Title: Display panel and display device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to Chinese patent application No. 202211034299.3 filed on Aug. 26, 2022, the disclosure of which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     Embodiments of the present disclosure relate to the field of display technology and, in particular, to a display panel and a display device. 
     BACKGROUND 
     With the development of the display technology, display panels are more and more widely used in products such as mobile phones, computers, tablet computers, and e-books and in meter-type display devices and control panels of smart homes. 
     In recent years, as display panels are equipped with more and more functions, the arrangement modes of different regions of a display panel may be different. As a result, reflectance of external ambient light is different in different regions, and thus different regions of the display panel in a non-display state are clearly demarcated. 
     SUMMARY 
     Embodiments of the present disclosure provide a display panel and a display device. By adding a reflection adjusting unit to adjust the reflectance of the display panels, the reflection differences in different areas of the display panel are thus reduced. 
     Embodiments of the present disclosure provide a display panel including a display region, and the display region includes multiple light-emitting elements. 
     The display panel further includes a light-shielding layer located on a light-emitting side of the multiple light-emitting elements. The light-shielding layer includes multiple light-shielding units, and along the thickness direction of the display panel, the light-shielding unit at least partially overlaps the gap between two adjacent light-emitting elements. 
     The display panel further includes a reflection adjusting unit located on a side of the light-shielding layer facing away from the light-emitting elements, and along the thickness direction of the display panel, the reflection adjusting unit overlaps at least part of the light-shielding unit. 
     Embodiments of the present disclosure provide a display device including the display panel described in the above-mentioned embodiments. 
     According to the display panel provided by embodiments of the present disclosure, a light-shielding layer on the light-emitting side of the light-emitting element helps avoid the optical crosstalk between adjacent light-emitting elements; thus, the display effect of the display panel is ensured. Meanwhile, by adding a reflection adjusting unit, the reflectance of the surface of the display panel surface is adjusted, the reflected light of the external ambient light can be prevented from influencing the normal light-emitting of the display panel, and the reflectance of different regions in the display region can be adjusted so that the display difference caused by different reflectance in different regions is avoided, and the display effect of the display panel is promoted. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       In order to more clearly illustrate embodiments of the present disclosure, a brief introduction to the drawings required in the description of the embodiments is described below. Apparently, the drawings are merely drawings of part, not all, of embodiments of the present disclosure to be described, and those skilled in the art may obtain other drawings based on the drawings described below on the premise that no creative work is done. 
         FIG.  1    is a schematic view of a display panel according to an embodiment of the present disclosure. 
         FIG.  2    is a schematic section view of the display panel provided in  FIG.  1    taken along section line A-A′. 
         FIG.  3    is a schematic section view of the display panel provided in  FIG.  1    taken along section line B-B′. 
         FIG.  4    is another schematic section view of the display panel provided in  FIG.  1    taken along section line B-B′. 
         FIG.  5    is another schematic section view of the display panel provided in  FIG.  1    taken along section line B-B′. 
         FIG.  6    is another schematic section view of the display panel provided in  FIG.  1    taken along section line B-B′. 
         FIG.  7    is another schematic section view of the display panel provided in  FIG.  1    taken along section line B-B′. 
         FIG.  8    is a view of schematic another display panel according to an embodiment of the present disclosure. 
         FIG.  9    is a schematic section view of the display panel provided in  FIG.  8    taken along section line C-C′. 
         FIG.  10    is a schematic section view of the display panel provided in  FIG.  8    taken along section line D-D′. 
         FIG.  11    is another schematic section view of the display panel provided in  FIG.  8    taken along section line E-E′. 
         FIG.  12    is another schematic section view of the display panel provided in  FIG.  8    taken along section line D-D′. 
         FIG.  13    is another schematic section view of the display panel provided in  FIG.  8    taken along section line E-E′. 
         FIG.  14    is another schematic section view of the display panel provided in  FIG.  8    taken along section line D-D′. 
         FIG.  15    is another schematic section view of the display panel provided in  FIG.  8    taken along section line E-E′. 
         FIG.  16    is a schematic view of a second display region according to an embodiment of the present disclosure. 
         FIG.  17    is a schematic view of the second display region provided in  FIG.  16    taken along section line F-F′. 
         FIG.  18    is a schematic view of a third display region according to an embodiment of the present disclosure. 
         FIG.  19    is a schematic section view of a third display region provided in  FIG.  18    taken along section line G-G′. 
         FIG.  20    is a schematic view of a first display region according to an embodiment of the present disclosure. 
         FIG.  21    is a schematic section view of the first display region provided in  FIG.  20    taken along section line H-H′. 
         FIG.  22    is a schematic view of a display device according to an embodiment of the present disclosure. 
         FIG.  23    is a schematic section view of a display device according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure is further described hereinafter in detail in conjunction with drawings and embodiments. It is to be understood that the embodiments described herein are intended to explain the present disclosure and not to limit the present disclosure. Additionally, it is to be noted that for ease of description, only part, not all, of the structures related to the present disclosure are illustrated in the drawings. 
       FIG.  1    is a schematic view of a display panel provided by embodiments of the present disclosure.  FIG.  2    is a schematic section view of the display panel provided by  FIG.  1    taken along section line A-A′. As shown in  FIGS.  1  and  2   , the display panel  10  according to embodiments of the present disclosure includes a display region  11 . The display region  11  includes multiple light-emitting elements  111 . The display panel  10  further includes a light-shielding layer  12  located on a light-emitting side of the light-emitting elements. The light-shielding layer  12  includes multiple light-shielding units  121 . Along the thickness direction of the display panel  10  (the direction X as shown), a light-shielding unit  121  of the multiple light-emitting elements at least partially overlaps the gap between two adjacent light-emitting elements  111 . The display panel  10  further includes a reflection adjusting unit  13  located on a side of the light-shielding layer  12  facing away from the light-emitting elements. Along the thickness direction of the display panel  10  (the direction X as shown), the reflection adjusting unit  13  overlaps at least part of the light-shielding unit  121 . 
     In an exemplary embodiment, the display panel  10  includes the display region  11  including multiple light-emitting elements  111 . The light-emitting elements  111  emit light to perform the display function of the display panel  10 . In an example, the display panel  10  may further include a pixel circuit (not shown) located at the display region. The pixel circuit is electrically connected to the light-emitting elements, for providing display drive signals to the light-emitting elements, to ensure that the light-emitting elements can perform normal light-emitting display. In an example, the pixel circuit may include a thin-film transistor and a storage capacitor. For example, the pixel circuit may be a “2T1C” pixel circuit composed of two thin-film transistors and one storage capacitor or a “7T1C” pixel circuit composed of seven thin-film transistors and one storage capacitor. The pixel circuit may also include other structures, and the specific arrangement of the pixel circuit is not limited by embodiments of the present disclosure. In an example, the light-emitting element  111  may be an organic light-emitting diode, a micro light-emitting diode or a liquid crystal light-emitting element, and embodiments of the present disclosure do not limit the specific type of the light-emitting element  111 . 
     In an exemplary embodiment, the display panel  10  provided by embodiments of the present disclosure further includes a light-shielding layer  12  located on a light-emitting side of the light-emitting elements  111 . The light-shielding layer  12  includes multiple light-shielding units  121 , and along the thickness direction of the display panel, the light-shielding unit  121  covers a gap between two adjacent light-emitting elements  111 , that is, the light-shielding unit  121  limits the light-emitting region of the light-emitting elements  11 . In this manner, the light-shielding unit  121  can avoid the optical crosstalk between adjacent light-emitting elements  111  and enhance the display effect of the display panel. 
     In an exemplary embodiment, the display panel  10  provided by embodiments of the present disclosure further includes a reflection adjusting unit  13  located on a side of the light-shielding layer  12  facing away from the light-emitting elements  111 . Along the thickness direction of the display panel, the reflection adjusting unit  13  overlaps at least part of the light-shielding unit  121 . In this manner, the reflection adjusting unit  13  can adjust the reflectance of the surface of the display panel  10 , and the reflection differences in different regions of the display panel are thus reduced. For example, by reducing the reflection difference between the normal display region and the photosensitive region in the display region  11 , it is ensured that the reflectance of different regions in the display region is the same or similar, that reflection degree of different regions in the display region to external ambient light is the same or similar, that the influence of the external ambient light on the light-emitting from different regions in the display region is the same or similar, and that the display balance of the display panel is good. In an example, the reflection adjusting unit  13  adjusts the reflectance of the surface of the display panel  10  to reduce reflection differences of different regions in the display region  11 , blur the boundary between different regions in the display region  11 , and avoid clear boundary between different display regions in a non-display state due to large reflection differences in different regions, for example, the clear boundary between a normal display region and a photosensor, thereby improving the user experience. 
     It is to be noted that the shape of the light-emitting element and the arrangement of the light-emitting element are not limited by embodiments of the present disclosure.  FIG.  1    illustrates only one possible shape and arrangement of the light-emitting element. Other shapes and arrangements of the light-emitting element also fall within the protection scope of embodiments of the present disclosure. 
     It is also to be noted that in order to clearly show different structures, embodiments of the present disclosure only shows the reflection adjusting unit in the section view provided by  FIG.  2   , and the reflection adjusting unit in the subsequent embodiments also are only shown in the section view. That the reflection adjusting unit is not shown in the top view does not indicate that the reflection adjusting unit is not present in the drawings. 
     In summary, according to the display panel provided by embodiments of the present disclosure, a light-shielding layer on the light-emitting side of the light-emitting element helps avoid the optical crosstalk between adjacent light-emitting elements; thus, the display effect of the display panel is ensured. Meanwhile, by adding a reflection adjusting unit, the reflectance of the surface of the display panel surface is adjusted, the reflected light of the external ambient light can be prevented from influencing the normal light-emitting of the display panel, and the reflectance of different regions in the display region can be adjusted so that the display difference caused by different reflectance in different regions is avoided, and the display effect of the display panel is promoted. 
     On the basis of the above-mentioned embodiments, the reflectance of the reflection adjusting unit  13  is less than the reflectance of the light-shielding unit  121 . 
     Exemplarily, as shown in  FIG.  2   , the reflection adjusting unit  13  is located on the side of the light-shielding unit  121  facing away from the light-emitting element  111 , so that the reflection adjusting unit  13  replaces the light-shielding unit  121  for reflecting light shed from external environment on the display panel. According to the technical solution of embodiments of the present disclosure, the reflectance of the reflection adjusting unit  13  is set to be less than the reflectance of the light-shielding unit  121 , so that the reflection to external ambient light can be reduced and the reflected light from the display panel can be reduced, that is, the interference of external ambient light on the light-emitting element  111  can be reduced, and thus the display effect of the display panel can be improved. For example, setting the reflectance of the reflection adjusting unit  13  to be less than the reflectance of the light-shielding unit  121  helps avoid a case where the content displayed on the display panel cannot be seen clearly when the intensity of external ambient light is large. 
     On the basis of the above-described embodiments, with continued reference to  FIG.  1   , in the display panel  10  provided by embodiments of the present disclosure, the display region  11  may include a first display region  11 - 1  and a second display region  11 - 2 . The first display region  11 - 1  includes a photosensitive region, and the second display region  11 - 2  at least partially surrounds the first display region  11 - 1 . Along the first direction, the reflectance of the display panel  10  gradually increases. The first direction points from the second display region  11 - 2  to the first display region  11 - 1 . 
     In an exemplary embodiment of the present disclosure, the display region  11  includes a first display region  11 - 1  and a second display region  11 - 2 , where the second display region  11 - 2  may be a normal display region, that is, the primary display region of display panel  10 , is primarily responsible for displaying. The first display region  11 - 1  may be a high-transmittance display region or a transparent display region. The first display region  11 - 1  has both a display function and a light-transmission function, that is, the first display region  11 - 1  may include a photosensitive region, and the photosensitive element provided in correspondence with the photosensitive region may realize an optical recognition function through the light transmitted through the first display region  11 - 1 . In an example, the photosensitive region may be, for example, an optical imaging region or an optical fingerprint recognition region. Correspondingly, the display panel can perform imaging function or fingerprint recognition function. In an example, since the pixel circuit for driving the light-emitting element to emit light is a main light-shielding element, in order to ensure that the transmittance of the first display region is greater than the transmittance of the second display region, the distribution density of the pixel circuits in the first display region may be set to be less than the distribution density of the pixel circuits in the second display region. In an example, the distribution density of the light-emitting elements in the first display region may be set to be less than the distribution density of the light-emitting elements in the second display region, or the same pixel circuit in the first display region may be set to drive at least two light-emitting elements, that is, the distribution density of the pixel circuits in the first display region may be reduced by “one driving multiple”. Alternatively, the size of the pixel circuit in the first display region is set to be less than the size of the pixel circuit in the second display region to achieve a higher transmittance of the first display region. Embodiments of the present disclosure do not limit how the high-transparency display or transparent display is realized in the first display region. 
     In an exemplary embodiment, since the first display region  11 - 1  is a high-transmittance display region or a transparent display region, the first display region  11 - 1  may not be provided with a light-shielding layer  12  or the distribution density of the light-shielding units in the first display region  11 - 1  is less than the distribution density of the light-shielding units in the second display region  11 - 2 .  FIG.  1    is only an example in which the first display region  11 - 1  is not provided with a light-shielding layer  12 . In this manner, the first display region  11 - 1  can be ensured to transmit light normally, and the display panel can be ensured to perform the optical recognition function. The inventors have found that when the first display region  11 - 1  is not provided with a light-shielding layer  12  or the distribution density of the light-shielding units in the first display region  11 - 1  is less than the distribution density of the light-shielding units in the second display region  11 - 2 , the film structure (for example, a pixel circuit) of the display panel  10  located below the light-shielding layer  12  has a relatively strong reflection action of light shed thereon. Thus, a relatively large display difference between the first display region  11 - 1  and the second display region  11 - 2  is made, resulting in a large display difference between the first display region  11 - 1  and the second display region  11 - 2 . Also, when the display panel  10  is in a non-display state, since the reflectance of the first display region  11 - 1  and the second display region  11 - 2  are different, the user can observe rather clearly the boundary between the first display region  11 - 1  and the second display region  11 - 2 , affecting the user experience. 
     Based on this, embodiments of the present disclosure inventively arrange the reflectance of the display panel  10  gradually increasing along a direction that extends in the second display region  11 - 2  and points towards the first display region  11 - 1 , so that the reflectance difference between the first display region  11 - 1  and the second display region  11 - 2  can be reduced, the boundary between the first display region  11 - 1  and the second display region  11 - 2  can be blurred, the display difference caused by the large reflectance difference between different regions and the problem that the first display region  11 - 1  is clearly visible in a non-display state can be avoided. In this manner, the display effect of the display panel and the user experience can be promoted. 
     How to realize the gradual increase of reflectance of the display panel along the first direction is described below. 
     As an exemplary embodiment,  FIG.  3    is a schematic section view of the display panel provided in  FIG.  1    taken along section line B-B′.  FIG.  4    is another schematic section view of the display panel provided in  FIG.  1    taken along section line B-B′.  FIG.  5    is another schematic section view of the display panel provided in  FIG.  1    taken along section line B-B′. As shown in  FIGS.  1 ,  3 ,  4  and  5   , the reflection adjusting unit  13  includes a first color reflection adjusting unit  131 . Along the first direction, the coverage area of the first color reflection adjusting unit  131  gradually decreases. 
     In an example, as shown in  FIGS.  3  to  5   , the reflection adjusting unit  13  includes a first color reflection adjusting unit  131  disposed on a side of the light-shielding unit  121  facing away from the light-emitting element  111 , and the reflectance of the first color reflection adjusting unit  131  is less than the reflectance of the light-shielding unit  121 . In this manner, the light flux reflected by external ambient light on the surface of the display panel  10  can be reduced, and light interference to the display panel  10  can be reduced. 
     In an example, along the first direction, the coverage area of the first color reflection adjusting unit  131  gradually decreases so that along the first direction, the exposed area of the light-shielding unit  121  gradually increases, and the reflectance of the display panel gradually increases. Thus, by adjusting the coverage area of the first color reflection adjusting unit to gradually decrease, the reflectance of the display panel gradually increases, the reflectance difference between the first display region and the second display region is reduced, the boundary between the first display region and the second display region is blurred, thereby improving the display effect of the display panel and the user experience. 
     It is to be noted that the specific color of the first color reflection adjusting unit is not limited by embodiments of the present disclosure. As a possible arrangement, the first color reflection adjusting unit  131  may be a red reflection adjusting unit. 
     Next, how to achieve the gradual decrease of the coverage area of the first color reflection adjusting unit is described below. 
     As an exemplary embodiment, with continued reference to  FIGS.  1  and  3   , along the first direction, the coverage area of the first color reflection adjusting unit  131  corresponding to the space between two adjacent light-emitting elements  111  gradually decreases. 
     In an example, as shown in  FIG.  3   , along the first direction, the coverage area of the first color reflection adjusting unit  131  corresponding to the space between two adjacent light-emitting elements  111  gradually decreases so that the exposed area of the light-shielding unit  121  corresponding to the space between two adjacent light-emitting elements  111  gradually increases. Since the reflectance of the light-shielding unit  121  is greater than the reflectance of the first color reflection adjusting unit  131 , it is ensured that along the first direction, the coverage area of the first color reflection adjusting unit  131  gradually decreases, and the implementation manner in which the coverage area of the first color reflection adjusting unit  131  gradually decreases is simple and feasible. 
     As another exemplary embodiment, as shown in  FIGS.  1  and  4   , along the first direction, for a light-shielding unit adjacent to the first display region  11 - 1 , the first color reflection adjusting unit  131  is not disposed on a side of the light-shielding unit  121  facing away from the light-emitting element. 
     In an example, as shown in  FIG.  4   , along the first direction, for a light-shielding unit adjacent to the first display region  11 - 1 , the first color reflection adjusting unit  131  is not disposed on a side of the light-shielding unit  121  facing away from the light-emitting element, that is, the setting area of the light-shielding unit  121  adjacent to the first display region  11 - 1  is offset from the setting area of the first color reflection adjusting unit  131  so that the exposed area of the light-shielding unit  121  corresponding to the space between the two adjacent light-emitting elements  111  can be gradually increased. Since the reflectance of the light-shielding unit  121  is greater than the reflectance of the first color reflection adjusting unit  131 , it is ensured that along the first direction, the coverage area of the first color reflection adjusting unit  131  gradually decreases, and the implementation manner in which the coverage area of the first color reflection adjusting unit  131  gradually decreases is simple and feasible. 
     It is to be noted that, along the first direction, the coverage area of the first color reflection adjusting unit  131  gradually decreases, and as shown in  FIG.  3   , among gaps between any two adjacent light-emitting elements  111 , the coverage area of the first color reflection adjusting unit  131  corresponding to one gap which is closer to the first display region  11 - 1  than another gap is less than the coverage area of the first color reflection adjusting unit corresponding to the another gap. As shown in  FIG.  4   , two regions may exist, and the coverage area of the first color reflection adjusting unit in one of the two regions closer to the first display region  11 - 1  is less than the coverage area of the first color reflection adjusting unit in another of the two regions farther away from the first display region  11 - 1 , but each region may include multiple gaps between light-emitting elements  111 . 
     As another exemplary embodiment, with continued reference to  FIGS.  1  and  5   , along the first direction, the coverage area of the first color reflection adjusting unit  131  corresponding to the space between two adjacent light-emitting elements  111  gradually decreases, and along the first direction, for a light-shielding unit adjacent to the first display region  11 - 1 , the first color reflection adjusting unit  131  is not disposed on a side of the light-shielding unit  121  facing away from the light-emitting element  111 . 
     In an example, as shown in  FIG.  3   , along the first direction, the coverage area of the first color reflection adjusting unit  131  corresponding to the space between two adjacent light-emitting elements  111  gradually decreases, and along the first direction, for a light-shielding unit adjacent to the first display region  11 - 1 , the first color reflection adjusting unit  131  is not disposed on a side of the light-shielding unit  121  facing away from the light-emitting element  111 . In this manner, along the first direction, the exposed area of the light-shielding unit  121  corresponding to the space between two adjacent light-emitting elements  111  gradually increases. Since the reflectance of the light-shielding unit  121  is greater than the reflectance of the first color reflection adjusting unit  131 , it is ensured that along the first direction, the coverage area of the first color reflection adjusting unit  131  gradually decreases, and the implementation manner in which the coverage area of the first color reflection adjusting unit  131  gradually decreases is simple and feasible. 
     In view of the above, by gradually decreasing the coverage area of the first color reflection adjusting unit along the first direction, the above-mentioned embodiment achieves a gradual increase in the reflectance of the first display panel along the first direction, the reflectance difference between the first display region and the second display region is reduced, the boundary between the first display region and the second display region is blurred, the display difference caused by the large reflectance difference between different regions and the problem that the first display region is clearly visible in a non-display state is avoided, thereby improving the display effect of the display panel and the user experience. 
     Next, how to realize the gradual increase of the reflectance of the display panel along the first direction from another perspective is described below. 
       FIG.  6    is another schematic section view of the display panel provided in  FIG.  1    taken along section line B-B′.  FIG.  7    is another schematic section view of the display panel provided in  FIG.  1    taken along section line B-B′. As shown in  FIGS.  1 ,  6 , and  7   , the reflection adjusting unit  13  includes a first color reflection adjusting unit  131  and a second color reflection adjusting unit  132 . The reflectance of the first color reflection adjusting unit  131  is less than the reflectance of the second color reflection adjusting unit  132 . Along the thickness direction of the display panel (direction X as shown), the reflection adjusting unit  13  covers the light-shielding unit  121 , and along the first direction, the coverage area of the second color reflection  132  adjusting unit gradually increases. 
     In an example, as shown in  FIGS.  6  and  7   , the reflection adjusting unit  13  covers the light-shielding unit  121  and includes the first color reflection adjusting unit  131  and the second color reflection adjusting unit  132 . The reflectance of the first color reflection adjusting unit  131  and the reflectance of the second color reflection adjusting unit  132  are both less than the reflectance of the light-shielding unit  121  so that the light flux reflected by external ambient light on the surface of the display panel  10  can be reduced, and light interference to the display panel  10  can be reduced. 
     In an example, since the reflectance of the second color reflection adjusting unit  132  is greater than the reflectance of the first color reflection adjusting unit  131 , by setting the coverage area of the second color reflection adjusting unit  132  to gradually increases along the first direction, it is ensured along the first direction, the reflectance of the display panel gradually increases, the reflectance difference between the first display region and the second display region is reduced, the boundary between the first display region and the second display region is blurred, thereby improving the display effect of the display panel and the user experience. 
     It is to be noted that the specific color of the first color reflection adjusting unit and the second color reflection adjusting unit are not limited by embodiments of the present disclosure. As a possible arrangement, the first color reflection adjusting unit may be a red reflection adjusting unit, and the second color reflection adjusting unit may be a green reflection adjusting unit. 
     Next, how to achieve a gradual increase in the coverage area of the second color reflection adjusting unit is described below. 
     As an exemplary embodiment, with continued reference to  FIGS.  1  and  6   , the coverage area of the second color reflection adjusting unit  132  corresponding to the space between two adjacent light-emitting elements  111  gradually increases. 
     In an example, as shown in  FIG.  6   , along the first direction, the coverage area of the second color reflection adjusting unit  132  corresponding to the space between two adjacent light-emitting elements  111  gradually increases, that is, the coverage area of the first color reflection adjusting unit  131  corresponding to the space between two adjacent light-emitting elements  111  gradually decreases. Since the reflectance of the second color reflection adjusting unit  132  is greater than the reflectance of the first color reflection adjusting unit  131 , it is ensured that along the first direction, the coverage area of the second color reflection adjusting unit  132  gradually increases, and the implementation manner in which the coverage area of the second color reflection adjusting unit  132  gradually increases is simple and feasible. 
     As another exemplary embodiment, with continued reference to  FIGS.  1  and  7   , along the first direction, for a light-shielding unit adjacent to the second display region  11 - 2 , the second color reflection adjusting unit  132  is not disposed on a side of the light-shielding unit  121  facing away from the light-emitting element  111 . 
     In an example, as shown in  FIG.  7   , along the first direction, for a light-shielding unit adjacent to the second display region  11 - 2 , the second color reflection adjusting unit  132  is not disposed on a side of the light-shielding unit  121  facing away from the light-emitting element  111 , that is, the setting area of the light-shielding unit  121  adjacent to the second display region  11 - 2  is offset from the setting area of the second color reflection adjusting unit  132 , that is, along the first direction, the light shielding unit  121  which is adjacent to the second display region  11 - 2  is not provided with a second color reflection adjusting unit  132  but only a first color reflection adjusting unit  131 . In this manner, it is ensured that along the first direction, the coverage area of the second color reflection adjusting unit  132  gradually increases, and the implementation manner in which the coverage area of the second color reflection adjusting unit  132  gradually increases is simple and feasible. 
     It is to be noted that, along the first direction, the coverage area of the second color reflection adjusting unit  132  gradually increases, and as shown in  FIG.  6   , among gaps between any two adjacent light-emitting elements  111 , the coverage area of the second color reflection adjusting unit corresponding to one gap which is closer to the first display region  11 - 1  than another gap is greater than the coverage area of the second color reflection adjusting unit corresponding to the another gap. As shown in  FIG.  7   , two regions may exist, and the coverage area of the second color reflection adjusting unit in one of the two regions closer to the first display region  11 - 1  is greater than the coverage area of the first color reflection adjusting unit in another of the two region farther away from the first display region  11 - 1 , but each region may include multiple gaps between light-emitting elements  111 . 
     In view of the above, by gradually increasing the coverage area of the second color reflection adjusting unit along the first direction, the above-mentioned embodiment achieves a gradual increase in the reflectance of the display panel along the first direction, the reflectance difference between the first display region and the second display region is reduced, the boundary between the first display region and the second display region is blurred, the display difference caused by the large reflectance difference between different regions and the problem that the first display region is clearly visible in a non-display state is avoided, thereby improving the display effect of the display panel and the user experience. 
     On the basis of the above-mentioned embodiment, as shown in  FIG.  6   , along the thickness direction of the display panel (direction X as shown), the reflection adjusting unit  13  covers the light-shielding unit  121 . The reflection adjusting unit  13  includes a first color reflection adjusting unit  131  and a second color reflection adjusting unit  132 . The reflectance of the first color reflection adjusting unit  131  is less than the reflectance of the second color reflection adjusting unit  132 . The coverage area of the first color reflection adjusting unit  131  is M, and the coverage area of the second color reflection adjusting unit  132  is N. Along the first direction, M/(M+N) gradually decreases. 
     Exemplarily, as shown in  FIG.  6   , along the first direction, the coverage area of the first color reflection adjusting unit  131  gradually decreases, and the coverage area of the second color reflection adjusting unit  132  gradually increases, that is, M/(M+N) gradually decreases and N/(M+N) gradually increases. In this manner, it is ensured that along the first direction, the reflectance of the display panel gradually increases. Moreover, it is ensured that the reflectance difference between the first display region and the second display region can be reduced, the boundary between the first display region and the second display region can be blurred, the display difference caused by the large reflectance difference between different regions and the problem that the first display region is clearly visible in a non-display state can be avoided. 
     The above-mentioned embodiment describes how to achieve a gradual increase in the reflectance of the display panel along the first direction by using examples of the arrangement of the first color reflection adjusting and the arrangement of the second color reflection adjusting. And how to adjust the reflectance of the display panel to gradually increase along the first direction is described next. 
       FIG.  8    is another schematic view of the display panel according to embodiments of the present disclosure. As shown in  FIG.  8   , the display panel  10  further includes a third display region  11 - 3 . The third display region  11 - 3  at least partially surrounds the first display region  11 - 1 , and the second display region  11 - 2  at least partially surrounds the third display region  11 - 3 . The reflectance of the third display region  11 - 3  is greater than the reflectance of the second display region  11 - 2  and less than the reflectance of the first display region  11 - 2 . 
     Exemplarily, the display region  11  of the display panel  10  may further include a third display region  11 - 3 , which may be located between the first display region  11 - 1  and the second display region  11 - 2 , that is, the third display  11 - 3  region at least partially surrounds the first display region  11 - 1  and the second display region  11 - 2  at least partially surrounds the third display region  11 - 3 . The third display region  11 - 3  may serve as a transition region between the first display region  11 - 1  and the second display region  11 - 2 . In an example, the third display region  11 - 3  may serve as a transition region between the reflectance of the first display region  11 - 1  and the reflectance of the second display region  11 - 2 , that is, the reflectance of the third display region  11 - 3  is greater than the reflectance of the second display region  11 - 2  and less than the reflectance of the first display region  11 - 2 , so that the reflectance of the display panel gradually increases along the first direction. In this manner, the reflectance difference between the first display region  11 - 1  and the second display region  11 - 2  can be reduced, the boundary between the first display region  11 - 1  and the second display region  11 - 2  can be blurred, the display difference caused by the large reflectance difference between different regions and the problem that the first display region  11 - 1  is clearly visible in a non-display state can be avoided, thereby improving the display effect of the display panel and the user experience. 
     In an example, the first display region  11 - 1  serves as a high-transmittance display region or a transparent display region, the second display region  11 - 2  serves as a normal display region, and the third display region  11 - 3  may serve as a transition region between the transmittance of the first display region  11 - 1  and the transmittance of the second display region  11 - 2 . For example, the distribution density of the pixel circuits in the third display region  11 - 3  is set to be greater than the distribution density of the pixel circuits in the first display region  11 - 1 , and less than the distribution density of the pixel circuits in the second display region  11 - 2 . Or the distribution density of the light-emitting elements in the third display region  11 - 3  is set to be greater than the distribution density of the light-emitting elements in the first display region  11 - 1 , and less than the distribution density of the light-emitting elements in the second display region  11 - 2 , so as to ensure a uniform transition of the display effect between the first display region and the second display region, avoid display differences caused by different distribution densities of the pixel circuits or the light-emitting elements, and ensure that the display uniformity of the display panel is good. 
     Next, how to set the reflectance of the third display region to be greater than the reflectance of the second display region and less than the reflectance of the first display region is described below. 
     As an exemplary embodiment,  FIG.  9    is another schematic section view of the display panel provided in  FIG.  8    taken along section line C-C′.  FIG.  10    is another schematic section view of the display panel provided in  FIG.  8    taken along section line D-D′.  FIG.  11    is another schematic section view of the display panel provided in  FIG.  8    taken along section line E-E′. As shown in  FIGS.  8  to  11   , the reflection adjusting unit  13  includes a first color reflection adjusting unit  131 , a second color reflection adjusting unit  132 , and a third color reflection adjusting unit  133 . The reflectance of the first color reflection adjusting unit  131  is less than the reflectance of the third color reflection adjusting unit  133 , and the reflectance of the third color reflection adjusting unit  133  is less than the reflectance of the second color reflection adjusting unit  132 . The first color reflection adjusting unit  131  covers the light-shielding unit located in the second display region  11 - 2 , the third color reflection adjusting unit  133  covers the light-shielding unit located in the third display region  11 - 3 , and the second color reflection adjusting unit  132  covers the light-shielding unit located in the first display region  11 - 1 . 
     In an example, as shown in  FIGS.  8  to  11   , the reflection adjusting unit  13  includes the first color reflection adjusting unit  131 , the second color reflection adjusting unit  132 , and the third color reflection adjusting unit  133 . The reflectance of the first color reflection adjusting unit  131 , the second color reflection adjusting unit  132 , and the third color reflection adjusting unit  133  are all less than the reflectance of the light-shielding unit  121 , so that the light flux reflected by external ambient light on the surface of the display panel  10  can be reduced, and light interference to the display panel  10  can be reduced. 
     In an example, among the first color reflection adjusting unit  131 , the second color reflection adjusting unit  132 , and the third color reflection adjusting unit  133 , the reflectance of the first color reflection adjusting unit  131  is the least, the reflectance of the second color reflection adjusting unit  131  is the largest, and the reflectance of the third color reflection adjusting unit  131  is between the two. Thus, the first color reflection adjusting unit  131  is set to cover the light-shielding unit located in the second display region  11 - 2 , the third color reflection adjusting unit  133  is set to cover the light-shielding unit located in the third display region  11 - 3 , and the second color reflection adjusting unit  132  is set to cover the light-shielding unit located in the first display region  11 - 1 . In this manner, it is ensured that the reflectance of the first color reflection adjusting unit  131 , the reflectance of the second color reflection adjusting unit  132 , and the reflectance of the third color reflection adjusting unit  133  gradually increase, that is, along the first direction, the reflectance of the display panel is gradually increased, so that the reflectance difference between the first display region  11 - 1  and the second display region  11 - 2  can be reduced, the boundary between the first display region  11 - 1  and the second display region  11 - 2  is blurred, the display difference caused by the large reflectance difference between different regions and the problem that the first display region  11 - 1  is clearly visible in a non-display state can be avoided, thereby improving the display effect of the display panel and the user. 
     It is to be noted that the second color reflection adjusting unit  132  covers the light-shielding unit located in the first display region  11 - 1  when the light-shielding unit is provided in the first display region  11 - 1 . In order to ensure that the transmittance of the first display region  11 - 1  is greater than the transmittance of the second display region, the distribution density of the light-shielding units in the first display region is less than the distribution density of the light-shielding units in the second display region, and/or the size of the light-shielding units in the first display region is less than the size of the light-shielding unit in the second display region. 
     It is also to be noted that the specific colors of the first color reflection adjusting unit, the second color reflection adjusting unit, and the third color reflection adjusting unit are not limited by embodiments of the present disclosure. As an exemplary arrangement, the first color reflection adjusting unit may be a red reflection adjusting unit, the second color reflection adjusting unit may be a green reflection adjusting unit, and the third color reflection adjusting unit may be a blue reflection adjusting unit. 
     As another exemplary embodiment,  FIG.  12    is another schematic section view of the display panel provided in  FIG.  8    taken along section line D-D′.  FIG.  13    is another schematic section view of the display panel provided in  FIG.  8    taken along section line E-E′. As shown in  FIGS.  8 ,  9 ,  12 , and  13   , the reflection adjusting unit  13  includes a first color reflection adjusting unit  131 . The reflectance of the first color reflection adjusting unit  131  is less than the reflectance of the light-shielding unit  121 . The first color reflection adjusting unit  131  covers the light-shielding unit  121  located in the second display region  11 - 2 . Along the thickness direction of the display panel (direction X as shown), the light-shielding unit  121  located in the third display panel  11 - 3  at most partially overlaps the reflection adjusting unit  13 . 
     In an example, as shown in  FIGS.  8 ,  9 ,  12 , and  13   , the reflection adjusting unit  13  at least includes a first color reflection adjusting unit  131 . The reflectance of the first color reflection adjusting unit  131  is less than the reflectance of the light-shielding unit  121 , and the first reflection adjusting unit  131  covers the light-shielding unit  121  located in the second display region  11 - 2 . In this manner, the light flux reflected by external ambient light on the surface of the second display region  11 - 2  can be reduced, and light interference to the second display region  11 - 2  can be reduced. 
     In an example, as shown in  FIGS.  8 ,  9 ,  12 , and  13   , the first color reflection adjusting unit  131  covers the light-shielding unit  121  located in the second display region  11 - 2  so that it is ensured that the second display region  11 - 2  has a smaller reflectance. Meanwhile, along the thickness direction (direction X as shown) of the display panel, the light-shielding unit  121  located in the third display region  11 - 3  at most partially overlaps the reflection adjusting unit  13 , that is, the third display region  11 - 3  is partially provided with the reflection adjusting unit or is provided no reflection adjusting unit.  FIG.  12    illustrates an example that the third display region  11 - 3  is provided with no reflection adjusting unit  13 . At this time, the reflectance of the third display region  11 - 3  must be greater than the reflectance of the second display region  11 - 2 . At the same time, the first display region  11 - 1  is provided with no light shielding unit, or the distribution density of the light shielding units in the first display region  11 - 1  is less than the distribution density of the light shielding units in the second display region  11 - 2  and in the third display region  11 - 3 . Therefore, whether or not the first display region  11 - 1  is provided with reflection adjusting units (in  FIG.  13   , the first display region is provided with no reflection adjusting unit), more light is transmitted through the first display region  11 - 1  and is reflected by the reflection structure (for example, a pixel circuit) in the first display region  11 - 1 . Therefore, the reflectance of the first display region  11 - 1  is greater than the reflectance of the third display region  11 - 3 . In this manner, it is ensured that the reflectance of the first color reflection adjusting unit  131 , the reflectance of the second color reflection adjusting unit  132 , and the reflectance of the third color reflection adjusting unit  133  gradually increase, that is, along the first direction, the reflectance of the display panel gradually increases, so that the reflectance difference between the first display region  11 - 1  and the second display region  11 - 2  can be reduced, the boundary between the first display region  11 - 1  and the second display region  11 - 2  is blurred, the display difference caused by the large reflectance difference between different regions and the problem that the first display region  11 - 1  is clearly visible in a non-display state can be avoided, thereby improving the display effect of the display panel and the user experience. 
     As an exemplary embodiment,  FIG.  14    is another schematic section view of the display panel provided in  FIG.  8    taken along section line D-D′. As shown in  FIGS.  8  and  14   , the reflection adjusting unit  13  includes a first color reflection adjusting unit  131 , a second color reflection adjusting unit  132 , and a third color reflection adjusting unit  133 . The reflectance of the first color reflection adjusting unit  131  is less than the reflectance of the third color reflection adjusting unit  133 , and the reflectance of the third color reflection adjusting unit  133  is less than the reflectance of the second color reflection adjusting unit  132 . The first color reflection adjusting unit  131  and the third color reflection adjusting unit  133  cover the light-shielding unit located in the third display region  11 - 3  which is adjacent to the second display region  11 - 2 . The second color reflection adjusting unit  132  and the third color reflection adjusting unit  133  cover the light-shielding unit  121  located in the third display region  11 - 2  which is adjacent to the first display region  11 - 1 . 
     In an example, as shown in  FIGS.  8  and  14   , the reflection adjusting unit  13  includes the first color reflection adjusting unit  131 , the second color reflection adjusting unit  132 , and the third color reflection adjusting unit  133 . Since the reflectance of the first color reflection adjusting unit  131 , the second color reflection adjusting unit  132 , and the third color reflection adjusting unit  133  are all less than the reflectance of the light-shielding unit  121 , and the first reflection adjusting unit  131 , the second color reflection adjusting unit  132 , and the third color reflection adjusting unit  133  all cover the light-shielding unit  121  located in the third display region  11 - 3 , it is ensured that the light flux reflected by external ambient light on the surface of the third display region  11 - 3  can be reduced, thereby reducing light interference to the third display region  11 - 3 . 
     In an example, since the reflectance of the first color reflection adjusting unit  131  is less than the reflectance of the third color reflection adjusting unit  133 , and the reflectance of the third color reflection adjusting unit  133  is less than the reflectance of the second color reflection adjusting unit  132 , the first color reflection adjusting unit  131  and the third color reflection adjusting unit  133  are set to cover the light-shielding unit  121  located in the third display region  11 - 3  which is adjacent to the second display region  11 - 2 , and that the second color reflection adjusting unit  132  and the third color reflection adjusting unit  133  cover the light-shielding unit  121  located in the third display region  11 - 3  which is adjacent to the first display region  11 - 1 . In this manner, it is ensured that the reflectance of the third display region  11 - 3  gradually increase along the first direction, that is, the reflectance of the third display region  11 - 3  adjacent to the second display region  11 - 2  is smaller and is close to the reflectance of the second display region  11 - 2 , and the reflectance of a side of the third display region  11 - 3  adjacent to the first display region  11 - 1  is greater and is close to the reflectance of the first display region  11 - 1 . Thus, it is ensured that the reflectance of the display panel gradually increases along the first direction so that the reflectance difference between the first display region  11 - 1  and the second display region  11 - 2  can be reduced, the boundary between the first display region  11 - 1  and the second display region  11 - 2  can be blurred, the display difference caused by the large reflectance difference between different regions and the problem that the first display region  11 - 1  is clearly visible in a non-display state can be avoided, thereby improving the display effect of the display panel and the user experience. 
     It is to be noted that the above-mentioned embodiment is described in terms of an example that the reflectance of the third display region gradually changes, that is, the reflectance adjacent to the second display region is smaller, and the reflectance adjacent to the first display region is greater. It is to be understood that it is also possible to realize a gradual increase of the third display region along the first direction by setting the coverage area of the first color reflection unit in the third display region to gradually decrease along the first direction (the specific implementation methods can be referred to the above-mentioned embodiments), and/or the coverage area of the second color reflection unit in the third display region gradually increases along the first direction (the specific implementation methods can be referred to the above-mentioned embodiments). In this manner, it is ensured that the reflectance of the second display region, the third display region and the first display region gradually increase, that is, the reflectance of the display panel gradually increases along the first direction, so that the reflectance difference between the first display region and the second display region can be reduced, the boundary between the first display region and the second display region can be blurred, thereby improving the display effect of the display panel and the user experience are promoted. 
     In summary, the above embodiments provide a third display region between the first display region and second display region and set the reflectance of the third display region in a range between the reflectance of the first display region and the reflectance of the second display region, that is, the reflectance of the third display region is less than the reflectance of the first display region and greater than the reflectance of the second display region, it is ensured that along the first direction, the reflectance of the display panel gradually increases, the reflectance difference between the first display region and the second display region is reduced, the boundary between the first display region and the second display region is blurred, and thus the display effect of the display panel and the user experience are improved. In an example, the reflectance of the third display region is set to be less than the reflectance of the first display region and greater than the reflectance of the second display region. The reflectance of the third display region may be set to remain unchanged as described in the above-mentioned embodiments, or the reflectance of the third display region may be set to gradually change as described in the above-mentioned embodiments, that is, the reflectance of the third display region gradually increases along the first direction. The above-mentioned various embodiments can ensure that the reflectance of the display panel gradually increases along the first direction. 
     On the basis of the above-mentioned embodiment,  FIG.  15    is another schematic section view of the display panel provided in  FIG.  8    taken along section line E-E′. As shown in  FIGS.  8  and  15   , the reflection adjusting unit  13  includes a first color reflection adjusting unit  131  (not shown in figures), a second color reflection adjusting unit  132 , and a third color reflection adjusting unit  133  (not shown in figures). The reflectance of the first color reflection adjusting unit  131  is less than the reflectance of the third color reflection adjusting unit  133 , and the reflectance of the third color reflection adjusting unit  133  is less than the reflectance of the second color reflection adjusting unit  132 . The second color reflection adjusting unit  132  covers the first display region. 
     In an example, the second color reflection adjusting unit  132  may be a green reflection adjusting unit. Since the photosensitive element (e.g., a fingerprint recognition element) provided in correspondence to the photosensitive region is sensitive to green light, the second color reflection adjusting unit  132  can be set to cover the first display region, that is, the second color reflection adjusting unit  132  covers the photosensitive area so that it is ensured that when light transmitted through the photosensitive area is shed on the photosensitive element, the photosensitive element has high sensitivity. 
     In an example, since the reflectance of the second color reflection adjusting unit  132  is less than the reflectance of the light-shielding unit, whether or not the light-shielding unit is provided for the first display region, by setting that the second color reflection adjusting unit  132  covers the first display region, the reflectance of the first display region can be reduced, the reflectance difference between the first display region and the other display region can be reduced, the boundary between the first display region and the second display region can be blurred, thereby improving the display effect of the display panel and the user experience. 
     On the basis of the above-mentioned embodiment,  FIG.  16    is a schematic view of a second display panel provided by embodiments of the present disclosure.  FIG.  17    is a schematic section view of the display panel provided by  FIG.  16    taken along section line F-F′.  FIG.  18    is a schematic view of a third display panel provided by embodiments of the present disclosure.  FIG.  19    is a schematic section view of the display panel provided by  FIG.  18    taken along section line G-G′.  FIG.  20    is a schematic view of a first display panel provided by embodiments of the present disclosure.  FIG.  21    is a schematic section view of the display panel provided by  FIG.  20    taken along section line H-H′. As shown in  FIGS.  16  to  21   , the display panel also includes a color filter layer  14  located on the light-emitting side of the light-emitting elements  111 . The color filter layer  14  includes multiple color filter units  141 . Along the thickness direction of the display panel (direction X as shown), the region defined by the color filter unit  141  at least partially overlaps the region defined by the light-shielding unit  121 . The reflection adjusting unit  13  and the color filter units  141  are disposed in the same layer. 
     In an example, the display panel provided by embodiments of the present disclosure may further include a color filter layer  14  located on the light-emitting side of the light-emitting element  111 . The color filter layer  14  includes multiple color filter units  141 , such as red color filter units  141 -R, green color filter units  141 -G, and blue color filter units  141 -B. Along the thickness direction of the display panel, the color filter units  141  at least partially overlap the region defined by the light-shielding unit  121 , that is, the region defined by the color filter unit  141  at least partially overlaps the region defined by the light-emitting unit  121 , so that the color filter units  141  of different colors can perform color filter on light emitted from the light-emitting elements  111  to perform the color display function of the display panel. 
     In an example, the display panel in the related art is generally provided with a polarizer on the light-emitting side of the light-emitting element to absorb external ambient light, so as to increase the proportion of the light emitted from the display panel itself, thereby realizing normal display of the display panel. However, since the polarizer also absorbs the normal light emitted from the display panel, and the polarizer has a large thickness and is not easy to bend, the provision of the polarizer reduces the normal light emission of the display panel, and causes the display panel to have a large thickness and cannot be bent or curved display. According to the technical solution of embodiments of the present disclosure, by providing a color filter layer and a light-shielding layer on the light-emitting side of the light-emitting element  111 , the external ambient light is filtered or absorbed by the color filter layer and the light-shielding layer, the light shed on the display panel inside can be reduced, that is, the reflection of the external ambient light by the reflective layer (for example, a pixel circuit or other metal reflective layers) in the display panel inside can be reduced, the reflection of the display panel to external ambient light is reduced, and the proportion of light emitted from the display panel itself is increased, thereby improving the display effect of the display panel. Therefore, the light-shielding layer and the color filter layer can replace the polarizers, and the light-shielding layer and the color filter layer have a small thickness and are easily bent. Therefore, by providing the color filter layer and the light-shielding layer on the light-emitting side of the light-emitting element in embodiments of the present disclosure, it is ensured that the interference of external ambient light on the normal light-emitting of the display panel can be reduced, and that the overall thickness of the display panel is small, and the bending or curve display panel can be easily realized. 
     In an example, since the color filter unit  141  is provided with a small reflectance, the reflection adjusting unit  13  and the color filter unit  141  can be disposed in the same layer, that is, the reflection adjusting unit  13  and the color filter unit  141  are made by using the same material and the same technique. In this manner, on one hand, it is ensured that the reflection adjusting unit  13  is provided in a simple manner. On the other hand, the reflection adjusting unit  13  and the color filter unit  141  are disposed in the same layer can ensure a simple structure of the film of the display panel, thereby facilitating the thin design of the display panel. 
     In an example, the display panel provided by embodiments of the present disclosure may further include an encapsulation layer (not shown in figures). The encapsulation layer is disposed between the light-emitting element and the color filter layer and used for packaging protection of the light-emitting element to prevent moisture or oxygen from entering the light emitting element and causing erosion to the light emitting element, so as to ensure the normal operation of the light-emitting element. In an example, the encapsulation layer may be a thin film encapsulation layer, such as TFE, such that the color filter layer forms a “CF0T” structure over the thin film encapsulation layer. 
     In an example, as shown in  FIGS.  16  and  17   , in the second display region  11 - 2 , the first color reflection adjusting unit  131  may be disposed in the same layer as the red color filter unit  141 -R. As shown in  FIGS.  18  and  19   , in the third display region  11 - 3 , the third color reflection adjusting unit  133  may be disposed in the same layer as the blue color filter unit  141 -B. As shown in  FIGS.  20  and  21   , in the first display region  11 - 1 , the second color reflection adjusting unit  132  may be disposed in the same layer as the green color filter unit  141 -G. On one hand, it is ensured that the arrangement of the reflection adjusting unit  13  is simple, and on the other hand, it is ensured that the reflectance of the display panel gradually increases along the first direction by combining the reflection characteristics of the color filter units  141  in different colors. 
     It is to be noted that  FIGS.  20  and  21    are described with reference to an example that the first display region  11 - 1  is not provided with a light-shielding unit. Further, in order to show different configurations, in  FIGS.  16 ,  18 , and  20   , the reflection adjusting unit and the light-shielding unit or the substrate are provided in a misalignment manner. But in the existing display panel, the reflection adjusting unit and the light-shielding unit or the substrate are provided in a non-misalignment manner. 
     On the basis of the above-mentioned embodiments, with continued reference to  FIGS.  8 ,  9 ,  10 , and  11   , the reflection adjusting unit  13  includes a first color reflection adjusting unit  131 , a second color reflection adjusting unit  132 , and a third color reflection adjusting unit  133 . The reflectance of the first color reflection adjusting unit  131  is less than the reflectance of the third color reflection adjusting unit  133 , and the reflectance of the third color reflection adjusting unit  133  is less than the reflectance of the second color reflection adjusting unit  132 . The first color reflection adjusting unit  131  includes a first adjusting surface  1311  facing the light-emitting element  111  and a second adjusting surface  1312  facing away from a side of the light-emitting element  111 . The second color reflection adjusting unit  132  includes a third adjusting surface  1321  facing the light-emitting element  111  and a fourth adjusting surface  1322  facing away from a side of the light-emitting element  111 . The third color reflection adjusting unit  133  includes a fifth adjusting surface  1331  facing the light-emitting element  111  and a sixth adjusting surface  1332  facing away from a side of the light-emitting element  111 . Along the thickness direction of the display panel (direction X as shown), the first adjusting surface  1311  covers the second adjusting surface  1312 , the fourth adjusting surface  1322  covers the third adjusting surface  1321 , and the fifth adjusting surface  1331  covers the sixth adjusting surface  1332 . 
     Exemplarily, as shown in  FIG.  9   , the first color reflection adjusting unit  131  includes a first adjusting surface  1311  facing the light-emitting element  111  and a second adjusting surface  1312  facing away from a side of the light-emitting element  111 . Along the thickness direction of display panel (direction X as shown), the first adjusting surface  1311  covers the second adjusting surface  1312 , that is, the first color reflection adjusting unit  131  has a structure of approximate “regular trapezoid”, ensuring that the manufacturing technique of the first color reflection adjusting unit  131  is simple and the structure is highly feasible. As shown in  FIG.  10   , the third color reflection adjusting unit  133  includes a fifth adjusting surface  1331  facing the light-emitting element  111  and a sixth adjusting surface  1332  facing away from a side of the light-emitting element  111 . The fifth adjusting surface  1331  covers the sixth adjusting surface  1332  along the thickness direction of display panel (direction X as shown), that is, the third color reflection adjusting unit  133  has a structure of approximate “regular trapezoid”, so as to ensure that the manufacturing technique of the first color reflection adjusting unit  131  is simple and the structure is highly feasible. As shown in  FIG.  11   , the second color reflection adjusting unit  132  includes a third adjusting surface  1321  facing the light-emitting element  111  and a fourth adjusting surface  1322  facing away from a side of the light-emitting element  111 . Along the thickness direction (direction X as shown), the fourth adjusting surface  1322  covers the third adjusting surface  1321 , that is, the second color reflection adjusting unit  132  has a structure of approximate “inverted trapezoid”. The shape of the second color reflection adjusting unit  132  matches the shape of the color filter units that are in contact therewith. In this manner, the design freedom of the second color reflection adjusting units is large and at the same time the light filtering function can perform normally. 
     On the basis of the above-mentioned embodiments, as shown in  FIGS.  9 ,  10 , and  11   , the first color reflection adjusting unit  131  further includes a first lateral surface  1313  connecting the first adjusting surface  1311  and the second adjusting surface  1312 . The second color reflection adjusting unit  132  further includes a second lateral surface  1323  connecting the third adjusting surface  1321  and the fourth adjusting surface  1322 . The third color reflection adjusting unit  133  further includes a third lateral surface  1333  connecting the fifth adjusting surface  1331  and the sixth adjusting surface  1332 . The included angle a between a tangent plane of any point in the first lateral surface  1313  and the plane in which the substrate  1  is located satisfies 40°≤α≤70°. The included angle β between a tangent plane of any point in the second lateral surface  1323  and the plane in which the substrate  1  is located satisfies 40≤β≤70°. The included angle β between a tangent plane of any point in the third lateral surface  1333  and the plane in which the substrate  1  is located satisfies 40°≤δ≤70°. 
     In an example, as shown in  FIG.  9   , the first color reflection adjusting unit  131  further includes a first lateral surface  1313  connecting the first adjusting surface  1311  and the second adjusting surface  1312 . The included angle a between a tangent plane of any point in the first lateral surface  1313  and the plane in which the substrate  1  is located satisfies 40°≤α≤70°, that is, the taper angle of the first color reflection adjusting unit  131  is provided between 40° to 70° to ensure that the arrangement of the first color reflection adjusting unit  131  is simple and matches the manufacturing technique of the first color reflection adjusting unit  131 , thereby ensuring that the manufacturing technique of the first color reflection adjusting unit  131  is simple. As shown in  FIG.  10   , the third color reflection adjusting unit  133  further includes a third lateral surface  1333  connecting the fifth adjusting surface  1331  and the sixth adjusting surface  1332 . The included angle δ between a tangent plane of any point in the third lateral surface  1333  and the plane in which the substrate  1  is located satisfies 40°≤δ≤70°, that is, the taper angle of the third color reflection adjusting unit  133  is provided between 40° to 70° to ensure that the arrangement of the third color reflection adjusting unit  131  is simple and matches the manufacturing technique of the third color reflection adjusting unit  133 , thereby ensuring that the manufacturing technique of the third color reflection adjusting unit  133  is simple. As shown in  FIG.  11   , the second color reflection adjusting unit  132  further includes a second lateral surface  1323  connecting the third adjusting surface  1321  and the fourth adjusting surface  1322 . The included angle β between a tangent plane of any point in the second lateral surface  1323  and the plane in which the substrate  1  is located satisfies 40°≤β≤70°, that is, the taper angle of the second color reflection adjusting unit  132  is provided between 40° to 70° to ensure that the arrangement of the second color reflection adjusting unit  132  is simple and matches the manufacturing technique of the second color reflection adjusting unit  132 , thereby ensuring that the manufacturing technique of the second color reflection adjusting unit  132  is simple. 
     Based on the same inventive concept, embodiments of the present disclosure further provide a display device, and  FIG.  22    is a schematic view of a display device provided by embodiments of the present disclosure. As shown in  FIG.  22   , the display device  100  includes the display panel  10  described in any one of the above-described embodiments. Therefore, the display device  100  provided by embodiments of the present disclosure has the corresponding advantages in the above-described embodiments, and details are not described herein. For example, the display device  100  may be a mobile phone, a computer, a smart wearable device (for example, a smart watch), an in-vehicle display device, or the like electronic device, which is not limited by embodiments of the present disclosure. 
       FIG.  23    is a schematic section view of a display device provided by embodiments of the present disclosure. As shown in  FIGS.  22  and  23   , in an exemplary embodiment, the display panel provided by embodiments of the present disclosure includes a display region  11 , and the display region includes a first display region  11 - 1 . The display device further includes a photosensitive unit  20  provided corresponding to the first display region  11 - 1 . 
     The photosensitive unit  20  may include any photosensitive elements such as a camera, an infrared sensor, and the like. By setting the photosensitive unit  20  corresponding to the first display region  11 - 1 , and setting the distribution density of the pixel circuit in the first display region  11 - 1  to be less than the distribution density of the pixel circuit in the normal display region, and/or setting the area proportion of the pixel circuit in the first display region  11 - 1  to be less than the area proportion of the pixel circuit in the normal display region, the light transmissive effect of the first display region  11 - 1  is improved to ensure that the photosensitive unit  20  can receive light normally and works normally. 
     It is to be noted that the preceding are only exemplary embodiments of the present disclosure and technical principles used therein. It is to be understood by those skilled in the art that the present disclosure is not limited to the embodiments described herein. Those skilled in the art can make various apparent modifications, adaptations, and substitutions without departing from the scope of the present disclosure. Therefore, while the present disclosure has been described in detail through the preceding embodiments, the present disclosure is not limited to the preceding embodiments and may include more other equivalent embodiments without departing from the concept of the present disclosure. The scope of the present disclosure is determined by the scope of the appended claims.