Patent Publication Number: US-2022223673-A1

Title: Display panel and display apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of International Application No. PCT/CN2020/124490, filed on Oct. 28, 2020, which claims priority to Chinese Patent Application No. 202010346189.5, filed on Apr. 27, 2020, both of which are hereby incorporated by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     The present application relates to the field of display technologies, and in particular to a display panel and a display apparatus. 
     BACKGROUND 
     With the rapid development of electronic devices, the requirements of users on screen-to-body proportions become higher and higher. Thus, full-screen displays for electronic devices are interested more and more by the industry. 
     Conventional electronic devices such as cell phones and tablets need integrated photosensitive components such as cameras and infrared sensing elements. Therefore, in order to increase the light transmittance of areas corresponding to the photosensitive components of the electronic devices, it is necessary to improve the structures of the areas corresponding to the photosensitive devices. Although light sensitivity requirements are met though the modification of the structures, the modification makes the display brightness of the areas different from other areas, which is not bad for the display by the display panel. 
     Therefore, there is a need for a new type of display panel and display apparatus. 
     SUMMARY 
     The present application provides a display panel and a display apparatus. The display panel facilitates the under-screen integration of a photosensitive component, and the display panel makes the display brightness of a first display area and a second display area uniform, which improves the display effect of the display panel. 
     In an aspect, the embodiments of the present application provide a display panel including: a second display area; a first display area including a transparent display area and a transition display area located between the transparent display area and the second display area, light transmittance of the transparent display area being greater than light transmittance of the second display area; a light-emitting element layer including a first pixel structure arranged in the first display area, the first pixel structure including a plurality of first sub-pixels, and each of first sub-pixels including a first electrode; a device layer stacked with the light-emitting element layer and including a plurality of first driving transistors located in the transition display area, each of the first driving transistors configured to drive one or more first sub-pixels emitting a same color in the transition display area and the transparent display area, and each of the first driving transistors including a first gate electrode; where, in a stacking direction the light-emitting element layer stacked with the device layer, an orthographic projection of a first gate electrode of one of the first driving transistors does not overlap an orthographic projection of a first electrode of a first sub-pixel emitting a color different from another first sub-pixel driven by the first driving transistor. 
     In another aspect, the embodiments of the present application provide a display apparatus including the above display panel. 
     According to the display panel and the display apparatus provided by the embodiments of the present application, the light transmittance of the light-transmitting display area of the display panel is greater than the light transmittance of the second display area, and therefore the requirements for under-screen integration of the photosensitive component such as a camera can be met. Since the display panel includes the device layer and the light-emitting element layer, the device layer includes the first driving transistors located in the transition display area, and one or more first sub-pixels emitting the same color in the transition display area and the transparent display area can be driven by each of the first driving transistors, so that the transition display area and the transparent display area can display images, thereby improving the screen-to-body ratio of the display panel. Furthermore, in the stacking direction the light-emitting element layer stacked with the device layer, the orthographic projection of the first gate electrode of one of the first driving transistors does not overlap the orthographic projection of the first electrode of the first sub-pixel emitting the color different from another first sub-pixel driven by the first driving transistor, so that in the first display area, the first gate electrode of the first driving transistor configured to drive the first sub-pixels emitting the same color is not affected by the first electrodes of the first sub-pixels emitting other colors, which reduces or avoids the display brightness difference between the first display area and the second display area, ensuring good display effect. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic structural diagram of a top view of a display panel according to an embodiment of the present application. 
         FIG. 2  is a schematic partial enlarged view of the region Q in  FIG. 1 . 
         FIG. 3  is a schematic structural diagram of a partial view including a transparent display area and a transition display area in  FIG. 2 . 
         FIG. 4  is a schematic structural diagram of a partial cross-sectional view taken along the direction m-m in  FIG. 3 . 
         FIG. 5  is a schematic structural diagram of a partial cross-sectional view taken along the direction n-n in  FIG. 3 . 
         FIG. 6  is a schematic structural diagram of a partial cross-sectional view taken along the direction p-p in  FIG. 2 . 
         FIG. 7  is a schematic partial enlarged diagram of a corresponding transparent display area of a display panel according to another embodiment of the present application. 
         FIG. 8  is a schematic partial enlarged diagram of a corresponding transition display area of a display panel according to yet another embodiment of the present application. 
         FIG. 9  is a schematic partial enlarged diagram of a corresponding transition display area of a display panel according to yet another embodiment of the present application. 
         FIG. 10  is a schematic structural diagram of a top view of a display apparatus according to an embodiment of the present application. 
         FIG. 11  is a schematic structural diagram of a partial cross-sectional view taken along the direction w-w in  FIG. 10 . 
     
    
    
     DETAILED DESCRIPTION 
     Features of various aspects and exemplary embodiments of the present application will be described in detail below. In order to make the objectives, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and specific embodiments. It should be understood that, the specific embodiments described herein are only configured for explaining the present application, and not configured for limiting the present application. For those skilled in the art, the present application can be implemented without some of those specific details. The following description of the embodiment is only for providing a better understanding of the present application by showing examples of the present application. 
     It will be understood that, in describing the structure of a component, when one layer or one region is referred to as being “on” or “above” another layer or another region, it means that the one layer or the one region is directly on the another layer or another region, or there are other layers or regions between the one layer or the one region and the another layer or the another region. In addition, if the component is turned upside-down, the one layer or the one region will be “under” or “below” the another layer or the another region. 
     Features and exemplary embodiments of various aspects of the present application are described in detail below. Furthermore, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments. 
     In electronic devices such as mobile phones and tablets, photosensitive components (e.g., front cameras, infrared light sensors, and proximity light sensors) are required to be integrated on the side where display panels are provided. In some embodiments, light-transmitting display areas may be provided on the above-mentioned electronic devices, and the photosensitive components may be arranged on the back of the light-transmitting display areas, so that full-screen display by the electronic devices can be realized with the normal operation of the photosensitive components being ensured. 
     In order to increase the light transmittance of the transparent display area, the pixel density of the transparent display area is generally set to be small. In order to reduce the wiring in the transparent display area, the pixel driving circuits of the transparent display area are usually arranged in the transition display area at the periphery of the transparent display area. However, as the pixel structure or the wiring position of the transparent display area changes, an anode of a sub-pixel emitting one color may be coupled with a pixel driving circuit of a sub-pixel emitting another color (for example, a gate electrode of a driving transistor), which results in parasitic capacitance, and thus crosstalk occurs in the light emission brightness between the sub-pixels emitting different colors, resulting in a difference in the display brightness between the transparent display area corresponding to the photosensitive component and other areas. 
     Therefore, in order to solve the above-mentioned technical problems, the embodiments of the present application provide a display panel and a display apparatus. The display panel and the display apparatus in the embodiments of the present application are described in detail below with reference to  FIG. 1  to  FIG. 11 . 
     With reference to  FIG. 1  and  FIG. 2 , the embodiments of the present application provide a display panel  100  including a first display area AA 1  and a second display area AA 2 . The first display area AA 1  includes a transparent display area AA 1   a  and a transition display area AA 1   b  between the transparent display area AA 1   a  and the second display area AA 2 . Light transmittance of the transparent display area AA 1   a  is greater than light transmittance of the second display area AA 2 . 
     Optionally, the transparent display area AA 1   a  has a light transmittance of 15% or more, or even 40% or even higher. In order to ensure that the transparent display area AA 1   a  has the light transmittance mentioned above, the light transmittance of each functional film layer of the display panel  100  in the embodiments is greater than 80%, and the light transmittance of a part of the functional film layers is even greater than 90%. 
     In the display panel  100  provided by the embodiments of the present application, the light transmittance of the transparent display area AA 1   a  of the first display area AA 1  is greater than the light transmittance of the second display area AA 2 , so that in the display panel  100 , an image acquiring component can be integrated on the back side of the transparent display area AA 1   a , so as to realize the under-screen integration of components such as a camera. At the same time, the first display area AA 1  can display images, so that the display area of the display panel  100  is improved, and the full-screen display by the display apparatus is realized. 
     With reference to  FIG. 1  to  FIG. 6 , the display panel  100  includes a device layer  10  and a light-emitting element layer  20  that are stacked. The light-emitting element layer  20  includes a first pixel structure arranged in the first display area AA 1  and a second pixel structure arranged in the second display area AA 2 . The first pixel structure includes a plurality of first sub-pixels  21  arranged in a predetermined manner. The second pixel structure includes a plurality of second sub-pixels arranged in a predetermined manner. The first sub-pixel  21  includes a first electrode  211 . 
     Optionally, the device layer  10  includes first driving transistors  11  located in the transition display area AA 1   b . The device layer  10  further includes second driving transistors  12  located in the second display area AA 2 . Each first driving transistor  11  is configured to drive one or more first sub-pixels  21  emitting a same color in the transition display area AA 1   b  and the transparent display area AA 1   a . Each second driving transistor  12  is configured to drive one of the second sub-pixels  22 . The first driving transistor  11  includes a first gate electrode  111 . In a stacking direction X the light-emitting element layer  20  stacked with the device layer  10 , an orthographic projection of a first gate electrode  111  of one of the first driving transistors  11  does not overlap an orthographic projection of a first electrode  211  of a first sub-pixel  21  emitting a color different from another first sub-pixel  21  driven by the first driving transistor  11 . That is, the orthographic projection of the first gate electrode  111  of each of the first driving transistors  11  does not overlap (or to say, is offset to) the orthographic projection of the first electrode  211  of a first sub-pixel  21  emitting a color other than the color emitted by the first sub-pixel  21  driven by the first driving transistor  11 . 
     In the display panel  100  provided in the embodiments of the present application, in the stacking direction X the light-emitting element layer  20  stacked with the device layer  10 , the orthographic projection of the first gate electrode  111  of one of the first driving transistors  11  does not overlap the orthographic projection of the first electrode  211  of the first sub-pixel  21  emitting a color different from another first sub-pixel  21  driven by the first driving transistor  11 , so that in the first display area AA 1 , the first gate electrode  111  of the first driving transistor  11  configured to drive the first sub-pixels  21  emitting a same color is not affected by the first electrodes  211  of the first sub-pixels  21  emitting different colors. Thus, cross-talk of light brightness does not occur between the first sub-pixels  21  emitting different colors, so that the difference in display brightness between the first display area AA 1  and the second display area AA 2  is reduced or avoided, ensuring good display effect. 
     Optionally, the first sub-pixels  21  in the transparent display area AA 1   a  may be driven by the first driving transistors  11  located in the transition display area AA 1   b . For the sake of clarity, it is shown in  FIG. 2  and  FIG. 3  that the first electrode  211  of only one of the first sub-pixels  21  is connected to the first driving transistor  11  in the transition display area AA 1   b  via a connection structure for illustration. In a specific implementation, a corresponding driving transistor may not be provided under each first sub-pixel  21  in the transparent display area AA 1   a , so as to better ensure good light transmittance. 
     In an optional implementation, in the display panel  100  provided by the above embodiments, an orthographic projection of at least one of the first gate electrodes  111  does not overlap orthographic projections of the first electrodes  211  of the first sub-pixels  21  in the stacking direction X. With the above arrangement, the driving requirements of the first driving transistors  11  located in the transition display area AA 1   b  for the first sub-pixels  21  in the transparent display area AA 1   a  and the transition display area AA 1   b  can be satisfied, and at the same time, the influence on the first gate electrodes  111  of the first driving transistors  11  located in the transition display area AA 1   b  configured to drive the first sub-pixels  21  emitting a same color by the first electrodes  211  of the first sub-pixels  21  emitting different colors can be better avoided, so as to reduce the crosstalk of light emission brightness and optimize the display effect. 
     In some optional embodiments, in the display panel  100  provided by the above embodiments. Each second driving transistor  12  includes a second gate electrode  121 . Each second sub-pixel  22  includes a second electrode  221 . In the stacking direction X, an orthographic projection of a second gate electrode  121  of one of the second driving transistors  12  does not overlap an orthographic projection of a second electrode  221  of a second sub-pixel  22  emitting a color different from another second sub-pixel  22  driven by the second driving transistor  12 . That is, the orthographic projection of the second gate electrode  121  of each of the second driving transistors  12  does not overlap (or to say, is offset to) the orthographic projection of the second electrode  221  of a second sub-pixel  22  emitting a color other than the color emitted by the second sub-pixel  22  driven by the first driving transistor  11 . 
     With the above arrangement, it is ensured that the second gate electrode  121  of the second driving transistor  12  configured to drive the second sub-pixels  22  emitting a same color in the second display area AA 2  is not affected by the second electrodes  221  of the second sub-pixels  22  emitting different colors. Thus, crosstalk of light emission brightness does not occur between the second sub-pixels  22  emitting different colors, which further reduces or avoids the difference in display brightness between the first display area AA 1  and the second display area AA 2 , so that the display apparatus  100  has a better display effect. 
     In addition, with the above arrangement, when the optimal gamma parameter is lowered in a white image of the display panel to make the brightness of the first display area AA 1  and the second display area AA 2  consistent, it can also be ensured that there is no difference in the brightness between the first display area AA 1  and the second display area AA 2  when the display panel  100  switches from a white image to a monochrome image. 
     In an optional implementation, an orthographic projection of at least one of the second gate electrodes  121  does not overlap orthographic projections of the second electrodes  221 . The above arrangement can better satisfy the driving requirements of the second sub-pixels  22 . 
     In some optional embodiments, in the display panel  100  provided by the above embodiments, the first pixel structure and the second pixel structure have a same arrangement structure. 
     Optionally, an arrangement manner of the second sub-pixels  22  of the second pixel structure includes RGBG, where R represents a red sub-pixel, G represents a green sub-pixel, and B represents a blue sub-pixel. In the second pixel structure, at least a part of the second sub-pixels  22  may be repeatedly arranged in a combination order of RGBG. In some optional embodiments, all of the second sub-pixels  22  of the second pixel structure may be repeatedly arranged in the combination order of RGBG. That is, the second sub-pixels  22  of the second pixel structure may be arranged in a Bayer array. 
     Optionally, the arrangement manner of the first sub-pixels  21  of the first pixel structure includes RGBD, where R represents a red sub-pixel, G represents a green sub-pixel, B represents a blue sub-pixel, and D may refer to an abbreviation of “Dummy”. “Dummy” may refer to that the region is provided with a first sub-pixel  21  which makes the arrangement structure in the first pixel structure consistent with the arrangement structure in the second pixel structure. The first sub-pixel  21  may not be provided with a corresponding first driving transistor  11  and is a non-light-emitting first sub-pixel, as long as the light transmittance requirement can be satisfied and/or the periodicity of the pixel arrangement can be ensured. For example, as shown in  FIG. 2 , D may correspond to the G (i.e., the second green sub-pixel  22   c ) in the second pixel arrangement of the second display area AA 2 , in order to ensure the periodicity of the pixel arrangement. 
     At least part of the first sub-pixels  21  in the first pixel structure may be arranged repetitively in a combination order of RGBD, and in some alternative embodiments all first sub-pixels in the first pixel structure may be arranged repetitively in a combination order of RGBD. 
     With the above arrangement, the periodicity of the plurality of first sub-pixels  21  in the first display area AA 1  and the periodicity of the plurality of second sub-pixels  22  in the second display area AA 2  in the display panel  100  are ensured. At the same time, the coupling condition of the first gate electrode  111  of the first driving transistor  11  to the corresponding first electrodes  211  in the transitional display area AA 1   b  can be better made consistent with or tend to be consistent with the coupling condition of the second gate electrode  121  of the second driving transistor  12  to the corresponding second electrodes  221  in the second display area AA 2 , so as to better ensure that there is no difference in brightness between the first display area AA 1  and the second display area AA 2  when the display panel  100  switches from a white image to a monochrome image. 
     In an optional implementation, in the display panel  100  provided by the above embodiments, the first driving transistors  11  are arranged in rows and columns. Optionally, the second driving transistors  12  are arranged in rows and columns. The above arrangement facilitates connection with corresponding lines such as a data line and a signal line. 
     In some optional embodiments, in the display panel provided by the above embodiments, the plurality of first sub-pixels  21  in the first pixel structure include first green sub-pixels  21   c , first red sub-pixels  21   a  and first blue sub-pixels  21   b . In the stacking direction X, an orthographic projection of a first gate electrode  111  of a first driving transistor  11  configured to drive the first green sub-pixels  21   c  does not overlap orthographic projections of the first electrodes  211 . With the above arrangement, the arrangement of RGBG of the second pixel structure of the display panel  100  and the arrangement of RGBD of the first pixel structure can be facilitated, and at the same time, the row and column arrangement of the first driving transistors  11  and the second driving transistors  12  can be further facilitated. 
     Optionally, in the first pixel structure, in the stacking direction X, an orthographic projection of a first gate electrode  111  of a first driving transistor  11  configured to drive the first blue sub-pixels  21   b  overlaps orthographic projections of the first electrodes  211  of the first blue sub-pixels  21   b . Additionally or alternatively, in the first pixel structure, in the stacking direction X, an orthographic projection of a first gate electrode  111  of a first driving transistor  11  configured to drive the first red sub-pixels  21   a  overlaps orthographic projections of the first electrodes  211  of the first red sub-pixels  21   a . With the above arrangement, the area of the spacing region occupied by the first driving transistors  11  is reduced, and it can also be ensured that in the first display area AA 1 , the first gate electrode  111  of the first driving transistor  11  configured to drive the first sub-pixels  21  emitting a same color is not affected by the first electrodes  211  of the first sub-pixels  21  emitting different colors. Thus, cross-talk of light brightness does not occur between the first sub-pixels  21  emitting different colors. 
     In an optional implementation, in the first pixel structure, the first red sub-pixels  21   a  and the first blue sub-pixels  21   b  constitute a plurality of first rows of sub-pixels which all extend along a first direction Y. The plurality of first green sub-pixels  21   c  constitute a plurality of second rows of sub-pixels which extend along the first direction Y. The plurality of first rows of sub-pixels and the plurality of second rows of sub-pixels are arranged alternately in a second direction Z. The first red sub-pixels  21   a  and the first blue sub-pixels  21   b  included in each first row of sub-pixels are arranged alternately. A spacing region is formed between the first red sub-pixels  21   a  and the first blue sub-pixels  21   b . In the stacking direction X, the orthographic projection of the first gate electrode  111  of the first driving transistor  11  configured to drive the first green sub-pixels  21   c  is within the spacing region. 
     With the above arrangement, it can be better ensured that in the first display area AA 1 , the first gate electrode  111  of the first driving transistor  11  configured to drive the first sub-pixels  21  emitting a same color is not affected by the first electrodes  211  of the first sub-pixels  21  emitting different colors, and the row and column arrangement of the first driving transistors  11  is better facilitated. 
     In an optional implementation, in the display panel  100  provided by the above embodiments, the plurality of first sub-pixels  22  in the first pixel structure include first green sub-pixels  22   c , first red sub-pixels  22   a  and first blue sub-pixels  22   b . In the stacking direction X, an orthographic projection of a first gate electrode  121  of a first driving transistor  12  configured to drive the first green sub-pixels  22   c  does not overlap orthographic projections of the first electrodes  221 . 
     Optionally, in the second pixel structure, in the stacking direction X, an orthographic projection of a second gate electrode  121  of a second driving transistor  12  configured to drive the second blue sub-pixels  22   b  overlaps orthographic projections of the second electrode  221  of the second blue sub-pixels  22   b . Additionally/alternatively, in the second pixel structure, in the stacking direction X, an orthographic projection of a second gate electrode  121  of a second driving transistor  12  configured to drive the second red sub-pixels  22   a  overlaps orthographic projections of the second electrodes  221  of the second red sub-pixels  22   a . With the above arrangement, the space of the spacing region occupied by the second driving transistors  12  is reduced, and it can also be ensured that in the second display area AA 2 , the second gate electrode  121  of the second driving transistor  12  configured to drive the second sub-pixels  22  emitting a same color is not affected by the second electrodes  221  of the second sub-pixels  22  emitting different colors. Thus, cross-talk of light brightness does not occur between the second sub-pixels  22  emitting different colors. 
     In an optional implementation, in the second pixel structure, the second red sub-pixels  22   a  and the second blue sub-pixels  22   b  constitute a plurality of third rows of sub-pixels which all extend along the first direction Y. The plurality of second green sub-pixels  22   c  constitute a plurality of fourth rows of sub-pixels which extend along the first direction Y. The plurality of third rows of sub-pixels and the plurality of fourth rows of sub-pixels are arranged alternately in a second direction Z. The second red sub-pixels  22   a  and the second blue sub-pixels  22   b  included in each third row of sub-pixels are arranged alternately. A spacing region is formed between the second red sub-pixels  22   a  and the second blue sub-pixels  22   b . In the stacking direction X, the orthographic projection of the second gate electrode  121  of the second driving transistor  12  configured to drive the second green sub-pixels  22   c  is within the spacing region. 
     With the above arrangement, it can better ensured that in the second display area AA 2 , the second gate electrode  121  of the second driving transistor  12  configured to drive the second sub-pixels  22  emitting a same color is not affected by the second electrodes  221  of the second sub-pixels  22  emitting different colors. Further, it can also be ensured that the coupling condition of the first gate electrode  111  of the first driving transistor  11  to the corresponding first electrodes  211  in the transitional display area AA 1   b  is consistent or tends to be consistent with the coupling condition of the second gate electrode  121  of the second driving transistor  12  to the corresponding second electrodes  221  in the second display area AA 2 . It is further ensured that the brightness of the main and auxiliary screens is consistent, and the brightness of the main and auxiliary screens is not different when the display panel  100  performs switching from a white image to a monochrome image. 
     As shown in  FIG. 7 , the display panel  100  provided by the above embodiments further includes an interconnection structure  30 . In the transparent display area AA 1   a , first electrodes  211  of two or more first sub-pixels  21  emitting a same color are electrically connected via the interconnection structure  30  and are driven by a same first driving transistor  11 . With the above arrangement, first sub-pixels  21  emitting a same color in the transparent display area AA 1   a  are driven by a same first driving transistor  11 , reducing the number of first driving transistors  11  and the wiring in the transparent display area AA 1   a , thereby better satisfying the light transmittance requirement of the transparent display area AA 1   a.    
     Optionally, the interconnect structure  30  is a wire-shaped structure. Optionally, the interconnect structure  30  may be made of a transparent material. 
     It will be appreciated that, although in each of the above embodiments, the arrangement of the second sub-pixels  22  of the second pixel structure includes RGBG and the arrangement of the first sub-pixels  21  of the first pixel structure includes RGBD, those arrangements are optional. In some other examples, the arrangement of the first sub-pixels  21  of the first pixel structure and the arrangement of the second sub-pixels  22  of the second pixel structure may both include repeating arrangement of the combination order of RGBG. 
     In actual practice, the first driving transistor configured to drive the first sub-pixels  21  in the transparent display area AA 1   a  may be placed in the transition display area AA 1 . When the transparent display area includes the interconnection structure  30 , the number of interconnected first electrodes  211  of first sub-pixels  21  emitting a same color in the transparent display area AA 1   a  may be set as required. In some examples, first electrodes  211  of every four first red sub-pixels  21   a  may be electrically connected via the interconnection structure  30  and driven by a same first driving transistor  11 . First electrodes  211  of every four first blue sub-pixels  21   b  are electrically connected via the interconnection structure  30  and driven by a same first driving transistor  11 . First electrodes  211  of every eight first green sub-pixels  21   c  are electrically connected via the interconnection structure  30  and are driven by a same first driving transistor  11 . At this time, the interconnection structure  30  for connecting the first green sub-pixels  21   c  may have an S-typed/arch-shaped wiring. With the above arrangement, not only the interconnection requirements of the first sub-pixels emitting a same color can be satisfied, but also the influence of the interconnection structure  30  on the first gate electrode  111  can be reduced. 
     Of course, the numbers of interconnected first electrodes  211  of the first sub-pixels  21  emitting same colors as described above are only an optional implementation, and the numbers of interconnected first electrodes  211  of the first sub-pixels  21  emitting same colors are not limited thereto, as long as the light transmittance requirement of the transparent display area AA 1   a  and the display requirement can be satisfied and the influence on the first gate electrode  111  can be reduced. 
     In some optional embodiments of the display panel  100 , as shown in  FIG. 8  and  FIG. 9 , in the transition display area AA 1   b , first electrodes  211  of two or more first sub-pixels  21  emitting a same color are electrically connected via the interconnect structure  30  and driven by a same first driving transistor  11 . The interconnection manners of the first electrodes  211  of the first sub-pixels  21  emitting the same color in the transition display area AA 1   b  can be referred to the interconnection manners of the first electrodes  211  of the corresponding the first sub-pixels  21  in the above transparent display area AA 1   a , which will not be repeated here. 
     By interconnecting the first electrodes  211  of the first sub-pixels  21  in the transition display area AA 1   b , the number of the first driving transistors  11  can be further reduced, and it is better ensured that the light transmittance of the transition display area AA 1   b  can be between those of the transparent display area AA 1   a  and the second display area AA 2 , optimizing the display effect of the display panel  100 . 
     It will be appreciated that, in the embodiments described above, first gate electrodes  111  of a part of the first driving transistors  11  overlap a first electrode  211  of any first sub-pixel  21  emitting the same color as the first sub-pixels  21  driven by the part of the first driving transistors  11 . Of course, this is merely an optional implementation and is not for limitation. In some other examples, in the stacking direction X, the orthographic projections of the first gate electrodes  111  of the first driving transistors  11  does not overlap the orthographic projections of the first electrodes  211  of the first sub-pixels  21 . 
     With the above-mentioned arrangement, it can also be satisfied that in the first display area AA 1 , the first gate electrode  111  of the first driving transistor  11  configured to drive the first sub-pixels  21  emitting the same color is not affected by the first electrodes  211  of the first sub-pixels  21  emitting different colors, so as to reduce or avoid the difference in display brightness between the first display area AA 1  and the second display area AA 2  and ensure good display effect. Especially when the first electrodes  211  of the first sub-pixels  21  emitting the same color in the transparent display area AA 1   a  and/or the transition display area AA 1   b  are interconnected via the interconnection structure  30 , an implementation structure in which the orthographic projection of the first gate electrode  111  of each first driving transistor  11  in the stacking direction X does not overlap the orthographic projection of the first electrodes  211  of first sub-pixels  21  may be used. 
     With continuing reference to  FIG. 1  to  FIG. 9 , in some optional embodiments, the display panel  100  may further include a pixel definition layer  23  including first pixel openings  231  arranged in the first display area AA 1  and second pixel openings  232  arranged in the second display area AA 2 . Each first sub-pixel  21  is located at one of the first pixel openings  231 . The first sub-pixel  21  further includes a first light-emitting structure  212  and a third electrode  213 . The first light-emitting structure  212  is located between the first electrode  211  and the third electrode  213 , and the first electrode  211  is arranged close to the side of the device layer  10 . In the stacking direction X, the orthographic projection of one first gate electrode  111  is at least partly within the orthographic projection of the first pixel opening  231 . This arrangement facilitates the control of the corresponding first sub-pixel, and can better ensure good light transmission effect of the transitional display area AA 1   b , so that the light transmittance of the transitional display area AA 1   b  can be between the first display area AA 1  and the second display area AA 2 . 
     Optionally, each second sub-pixel  22  is located at one of the second pixel openings  232 . Each second sub-pixel  22  further includes a second light emitting structure  222  and a fourth electrode  223 . The second light emitting structure  222  is located between the second electrode  221  and the fourth electrode  223 , and the second electrode  221  is located close to the device layer  10 . 
     Optionally, in the display panel  100 , the first electrode  211  and the second electrode  221  are both anodes and may be provided in a same layer. The third electrode  213  and the fourth electrode  223  are both cathodes and may be provided in a same layer. Optionally, the first gate electrode  111  and the second gate electrode  121  are provided in a same layer. 
     In an optional embodiment, the first electrode  211  may be a light-transmitting electrode. In some embodiments, the first electrode  211  includes an Indium Tin Oxide (ITO) layer or an indium zinc oxide layer. 
     In the display panel  100  provided by the embodiments of the present application, the light transmittance of the light-transmitting display area of the display panel  100  is greater than the light transmittance of the second display area AA 2  of the display panel  100 , and thus the under-screen integration of photosensitive elements such as image acquiring elements can be met can be met. 
     Since the display panel  100  includes the device layer  10  and the light-emitting element layer  20 , and the device layer  10  includes the first driving transistors  11  located in the transition display area AA 1   b  and the second driving transistors  12  located in the second display area AA 2 , one or more first sub-pixels  21  emitting the same color in the transition display area AA 1   b  and the transparent display area AA 1   a  can be driven by the first driving transistor  11  to perform image displaying and the second sub-pixels  22  located in the second display area AA 2  can be driven by the second driving transistor  12  to perform image displaying. Thus, the screen-to-body ratio of the display panel  100  is improved to better meet the full-screen display requirements. 
     Furthermore, in the stacking direction X the light-emitting layer  20  stacked with the device layer  10 , the orthographic projection of the first gate electrode  111  of one first driving transistor  11  does not overlap the orthographic projection of the first electrode  211  of the first sub-pixel  21  emitting a color different from another first sub-pixel  21  driven by the first driving transistor  11 , so that in the first display area AA 1 , the first gate electrode  111  of the first driving transistor  11  configured to drive the first sub-pixels  21  emitting a same color is not affected by the first electrodes  211  of the first sub-pixels  21  emitting other colors, which reduces or avoids the display brightness difference between the first display area AA 1  and the second display area AA 2 , ensuring good display effect. 
     Another aspect of the present application further provides a display apparatus including the display panel  100  according to any one of the above embodiments. The display panel  100  includes the first display area AA 1  and the second display area AA 2 . The first display area AA 1  includes the transparent display area AA 1   a  and the transition display area AA 1   b . The light transmittance of the transparent display area AA 1   a  is greater than the light transmittance of the transition display area AA 1   b . The display panel  100  includes opposing first and second surfaces S 1  and S 2 , where the first surface S 1  is a display surface. The display apparatus further includes a photosensitive component  200  located on the second surface S 2  side of the display panel  100 . The photosensitive component  200  corresponds to the position of the transparent display area AA 1   a  in the first display area AA 1 . 
     The photosensitive component  200  may be an image capturing device for capturing external image information. In the embodiments, the photosensitive component  200  may be a complementary metal oxide semiconductor (CMOS) image capture device. In some other embodiments, the photosensitive component  200  may be a charge-coupled device (CCD) image capturing device or other form of image capturing device. It can be understood that the photosensitive component  2  may not be limited to an image capturing device. For example, in some embodiments, the photosensitive component  200  may be a light sensor such as an infrared sensor, a proximity sensor, an infrared lens, a flood sensing element, an ambient light sensor, and a dot matrix projector. In addition, in the display apparatus  100 , other components may further be integrated on the second surface of the display panel, such as an earpiece, a speaker, etc. 
     In the display apparatus according to the embodiments of the present application, the light transmittance of the transparent display area AA 1   a  is greater than the light transmittance of the second display area AA 2 , so that the display panel  100  can be integrated with the photosensitive component  200  on the back side of the transparent display area AA 1   a , to realize under-screen integration of the photosensitive component  200  such as the image acquiring device. At the same time, the first display area AA 1  can display images, which increases the display area of the display panel  100  and realizes a full-screen design of the display apparatus. 
     In addition, since the orthographic projection of the first gate electrode  111  of each first driving transistor  11  does not overlap the orthographic projection of the first electrode  211  of the first sub-pixel  21  emitting a different color than the first sub-pixel  21  driven by the first driving transistor  11  in the stacking direction X the light-emitting element layer  20  stacked with the device layer  10 , so that in the first display area AA 1 , the first gate electrode  211  of the first driving transistor  11  configured to drive the first sub-pixels  21  emitting the same color is not affected by the first electrodes  211  of the first sub-pixels  21  emitting other colors, this reduces or avoids the display brightness difference between the first display area AA 1  and the second display area AA 2 , ensuring good display effect. 
     Furthermore, in the stacking direction X, the orthographic projection of the second gate electrode  121  of each second driving transistor  12  does not overlap with the orthographic projection of the first electrode  211  of a second sub-pixel  22  emitting a different color to the second sub-pixel  22  driven by the second driving transistor  12 , so that when the optimal gamma parameter is lowered in white images of the display panel to make the brightness of the first display area AA 1  and the second display area AA 2  consistent, it can be ensured that there is no difference in the brightness between the first display area AA 1  and the second display area AA 2  when the display panel  100  switches from a white image to a monochrome image, which makes the display apparatus easily to be widely used. 
     Although the present application has been described with reference to the preferred embodiments, various modifications may be made thereto and components thereof may be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in the embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, instead, it includes all technical solutions that fall within the scope of the claims.