Patent Publication Number: US-11651724-B2

Title: Electroluminescent display panel and display device

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application is a continuation of U.S. patent application Ser. No. 16/718,225, filed on Dec. 18, 2019, which claims priority to Chinese Patent Application No. 201910817502.6, filed with the Chinese Patent Office on Aug. 30, 2019. The entire disclosure of the above application is incorporated herein by reference. 
    
    
     FIELD 
     The disclosure relates to the field of display technologies and particularly to an electroluminescent display panel and a display device. 
     BACKGROUND 
     Electroluminescent displays are a type of self light-emitting device, which can be operated without a backlight source, and thus can be applied to a variety of scenarios since the display can be made lighter and thinner than the liquid crystal display. 
     The display panel in the electroluminescent display generally has a display region and a frame region surrounding the display region. A camera and other optical devices may be arranged in the frame region. Due to the larger volume of the camera, the area of the frame region occupied by the camera is larger, which is a limit to allow the display panel to have high screen-to-body ratio and narrow frame design. 
     SUMMARY 
     The embodiments of the disclosure provide an electroluminescent display panel and a display device, to increase the screen-to-body ratio of the display panel and implement the narrow frame design. 
     In one embodiment of the disclosure provides an electroluminescent display panel. The electroluminescent display panel includes a display region including a photosensitive device arranging region and a normal display region which at least partly surrounds the photosensitive device arranging region. The display region includes pixels including first pixels located in the photosensitive device arranging region, where a region between adjacent first pixels is a light-transmission region. The electroluminescent display panel further includes: a base substrate, and first signal lines and second signal lines located on the base substrate. The first pixels are electrically connected to the first signal lines and the second signal lines respectively, all the first signal lines are arranged in a column direction and extend in a row direction, and all the second signal lines are arranged in the row direction and extend in the column direction. The orthographic projections of the first signal lines and the second signal lines on the base substrate have overlap areas, and in the photosensitive device arranging region, overlap areas are located in an orthographic projection of one first pixel on the base substrate. 
     In one embodiment of the disclosure provides a display device including: the above-mentioned electroluminescent display panel as provided by the embodiment of the disclosure; and a camera or fingerprint recognition device is arranged in the photosensitive device arranging region of the electroluminescent display panel. 
     For the electroluminescent display panel and the display device provided by the embodiments of the disclosure, firstly the display region includes a photosensitive device arranging region, and a camera or fingerprint recognition device is arranged in the photosensitive device arranging region, rather than in the frame, and thus a relatively larger area occupying in the frame is avoided, to allow the frame be made narrower, and the screen-to-body ratio be increased. 
     Secondly for the photosensitive device arranging region, the first signal lines and the second signal lines are arranged more intensively by arranging overlap areas in the orthographic projection of one first pixel on the base substrate, to allow the display panel have more concentrated space as the light-transmission region, so that the light transmittance of the photosensitive device arranging region can be increased to provide more lights to the camera or fingerprint recognition device so that the camera or fingerprint recognition device can work normally and efficiently. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a structural schematic diagram of an electroluminescent display panel provided in some embodiments of the disclosure; 
         FIG.  2    is a structural schematic diagram of another electroluminescent display panel provided in some embodiments of the disclosure; 
         FIGS.  3 ,  4 ,  5 ,  6  and  7    are different enlarged layout views of a portion inside the solid box  1  in  FIG.  1    respectively; 
         FIG.  8    is a structural schematic diagram of a first pixel provided in some embodiments of the disclosure; 
         FIG.  9    is a structural schematic diagram of the adjacent first pixels provided in some embodiments of the disclosure; 
         FIG.  10    is an enlarged layout view of a portion inside the solid box  2  in  FIG.  1   ; 
         FIG.  11    is a structural schematic diagram of a display device provided in some embodiments of the disclosure. 
     
    
    
     Where:
     A—display region   A 1 —normal display region   G—photosensitive device arranging region   S 1 —first signal line   S 2 , S 21 —second signal line   S 0 —signal line   T—light-transmission region   P 1 , P 11 , P 12 , P 13 , P 14 , P 15 , P 16 , P 17 , P 18 , P 19 , P 20 —first pixel   P 2 —second pixel   D 1 —first segment   D 2 —second segment   D 3 —third segment   F 1 —first subsection   F 2 —second subsection   Z 1 , Z 2 , Z 3 —first signal line group     10 —electroluminescent display panel     20 —photosensitive device     100 —display device   

     DETAILED DESCRIPTION OF EMBODIMENTS 
     Electroluminescent display panel and display device provided by the embodiments of the disclosure will be illustrated below in details with reference to the drawings. 
     Embodiments of the disclosure provide an electroluminescent display panel, as illustrated in  FIGS.  1 - 7   , where  FIG.  1    is a structural schematic diagram of an electroluminescent display panel,  FIG.  2    is a structural schematic diagram of another electroluminescent display panel, and  FIGS.  3 - 7    are the enlarged layout views of different structures inside the solid box  1  in  FIG.  1    respectively. 
     According to one or more embodiments, as illustrated in  FIGS.  1  and  2    according to, the electroluminescent display panel includes a display region A, and the display region A includes a photosensitive device arranging region G and a normal display region A 1  which at least partly surrounds the photosensitive device arranging region G. 
     According to one or more embodiments, as illustrated in  FIGS.  3 - 7   , the display region A includes pixels including the first pixels (such as P 11 , P 12 , P 13 , P 14 , P 15 , P 16 , P 17 , P 18 , P 19 , P 20 ) located in the photosensitive device arranging region G, where the region between the adjacent first pixels is the light-transmission region T; the external light can be incident into the photosensitive device (e.g., camera or fingerprint recognition device or the like) through the light-transmission region T, so that the photosensitive device works after receiving the incident light. 
     The electroluminescent display panel further includes: a base substrate (not shown in  FIGS.  1 - 7   ), and first signal lines S 1  and second signal lines S 2  located on the base substrate, where the first pixels are electrically connected to the first signal lines S 1  and the second signal lines S 2  respectively, all the first signal lines S 1  are arranged in the column direction and extend in the row direction, and all the second signal lines S 2  are arranged in the row direction and extend in the column direction. 
     The orthographic projections of the first signal lines S 1  and the second signal lines S 2  on the base substrate have the overlap areas (which can be understood as the intersecting positions of the first signal lines S 1  and the second signal lines S 2  in  FIGS.  3 - 7   ), and in the photosensitive device arranging region G, overlap areas are located in the orthographic projection of one first pixel on the base substrate. 
     In one or more embodiments of the disclosure, the display region includes the photosensitive device arranging region G, and a camera or fingerprint recognition device is arranged in the photosensitive device arranging region, rather than in the frame, and thus a relatively larger area occupying in the frame is avoided, to allow the frame be made narrower, and the screen-to-body ratio be increased. 
     In the actual situation, for the photosensitive device arranging region G, if the orthographic projection of each first pixel on the base substrate corresponds to one overlap area, the first signal lines S 1  and the second signal lines S 2  are arranged relatively distributed; and if the first signal lines S 1  and the second signal lines S 2  are made of the electrically conductive material with lower light transmittance, the distributed first signal lines S 1  and second signal lines S 2  may block more light which will bring the decreased light transmittance. 
     In one or more embodiment of the disclosure, for the photosensitive device arranging region G, the first signal lines S 1  and the second signal lines S 2  are arranged more intensively by arranging overlap areas in the orthographic projection of one first pixel on the base substrate, to allow the display panel have more concentrated space as the light-transmission region, so that the light transmittance of the photosensitive device arranging region G can be increased to provide more lights to the camera or fingerprint recognition device so that the camera or fingerprint recognition device can work normally and efficiently. 
     In one or more embodiments of the disclosure, as illustrated in  FIG.  10    which is an enlarged view of the solid box  2  in  FIG.  1   , the pixels further include the second pixels P 2  arranged in an array and located in the normal display region A 1 , where the arranging density of the second pixels P 2  is larger than the arranging density of the first pixels P 1 . Further, in the normal display region A 1 , there is an overlap area in the orthographic projection(s) of at least a part of the second pixels P 2  on the base substrate, to ensure the normal display function of the normal display region A 1 . Since there is no particular requirements on the light transmittance for the normal display region A 1 , the second pixels P 2  and the overlap areas in this region can be arranged without specific limitations, to lower the structure complexity of the electroluminescent display panel and thus lower the difficulty of fabricating the electroluminescent display panel. 
     In one or more embodiments of the disclosure, the shape of the photosensitive device arranging region G can be a square (as illustrated in  FIG.  1   ) or can be an oval (as illustrated in  FIG.  2   ). Of course, it can also be another shape, which is not limited here and can be set according to the actual demand to increase the design flexibility. 
     In one or more embodiments of the disclosure, the first signal lines S 1  are the scan lines, reference signal lines or light emission control signal lines, and the second signal lines S 2  are the data lines or power supply signal lines, as illustrated in  FIGS.  3 - 7   . In one embodiment, in some embodiments, the first signal lines are the data lines or power supply signal lines, and the second signal lines are the scan lines, reference signal lines or light emission control signal lines, which is not limited here. The following is illustrated in an example where the first signal lines S 1  are the scan lines, reference signal lines or light emission control signal lines and the second signal lines S 2  are the data lines or power supply signal lines. 
     In one or more embodiments of the disclosure, in the photosensitive device arranging region G, overlap areas being located in the orthographic projection of one first pixel on the base substrate, includes that two overlap areas are located in the orthographic projection of one first pixel on the base substrate, as illustrated in  FIGS.  3 ,  5  and  6   ; or that three overlap areas are located in the orthographic projection of one first pixel on the base substrate, as illustrated in  FIG.  4   ; or that four overlap areas are located in the orthographic projection of one first pixel on the base substrate, as illustrated in  FIG.  7   ; of course, it is also possible that N overlap areas are located in the orthographic projection of one first pixel on the base substrate (not shown in the figure), where N is an integer greater than 4, not limited here, and set according to the actual demand, to increase the design flexibility and further improve the light transmittance of the photosensitive device arranging region G. 
     In one embodiment, in the structure as illustrated in  FIG.  3    according to one or more embodiments, the overlap areas of the orthographic projections of one second signal line S 2  and two first signal lines S 1  on the base substrate are located in the orthographic projection of the same first pixel (e.g., the first pixel marked as P 11  in  FIG.  3   ) on the base substrate. 
     In another embodiment, in the structure as illustrated in  FIG.  5    according to one or more embodiments, the overlap areas of the orthographic projections of one first signal line S 1  and two second signal lines S 2  on the base substrate are located in the orthographic projection of the same first pixel (e.g., the first pixel marked as P 12  in  FIG.  5   ) on the base substrate. 
     In yet another embodiment, in the structure as illustrated in  FIG.  7    according to one or more embodiments, the overlap areas of the orthographic projections of two first signal lines S 1  and two second signal lines S 2  on the base substrate are located in the orthographic projection of the same first pixel (e.g., the first pixel marked as P 13  in  FIG.  7   ) on the base substrate. 
     In one or more embodiments of the disclosure, each pixel includes a light emitting unit, and the region where the light emitting unit is located can be understood as the opening region of the pixel. The pixel emits the light through this opening region, to implement the display function of the electroluminescent display panel. Here, that overlap areas are located in the orthographic projection of one first pixel on the base substrate can be understood as that overlap areas are located in one opening region. 
     In one embodiment, in order to further improve the light transmittance of the photosensitive device arranging region G, in one or more embodiments of the disclosure, there can be several ways as follows: 
     First Way: 
     In one or more embodiments, as illustrated in  FIGS.  6 ,  8  and  9   , the first pixel includes a first subsection F 1  and at least one second subsection F 2 , where the respective second subsections are located at the edge of the first subsection F 1  and connected to the first subsection F 1 , the arranging direction of the second subsections F 2  and the first subsection F 1  is parallel to the extending direction of the first signal lines S 1  or the second signal lines S 2 . 
     In one embodiment, referring to the structural schematic diagram of the first pixel shown in  FIG.  8   , this first pixel includes one first subsection F 1  and two second subsections F 2 , where the two second subsections F 2  are located at two opposite sides of the first subsection F 1  respectively, and the arranging direction of the first subsection F 1  and the second subsections F 2  is parallel to the extending direction of the second signal line S 2  (the Y direction as illustrated in  FIG.  8   ). At the same time, in  FIG.  8   , the orthographic projections of one second signal line S 2  and each of two first signal lines S 1  on the base substrate have an overlap area, and these two overlap areas are arranged along the Y direction. 
     That is, the arranging direction of two overlap areas is the same as the arranging direction of the first subsection F 1  and the second subsections F 2 . The arrangement of the first subsection and the second subsections can facilitate the decrease in the length of the first pixels in the X direction in  FIG.  8   , to leave more space in the X direction for the light-transmission region, increase the area of the light-transmission region, and thus further improve the light transmittance of the photosensitive device arranging region G. 
     It is noted that the above-mentioned first and second subsections are used for illustrating the shape of the orthographic projection of the first pixel on the base substrate, but will not have a limitation on the relative connection relationships among all the structures included in the first pixel. Thus, the shape of the orthographic projection of the first pixel on the base substrate can be adjusted on the basis of remaining the structure of the first pixel unchanged, to improve the light transmittance of the photosensitive device arranging region. 
     In one or more embodiments of the disclosure, as illustrated in  FIGS.  6  and  9   , when the arranging direction of the first and second subsections is parallel to the extending direction of the first or second signal lines, in at least a part of first pixels which are adjacent to each other: 
     the first and second subsections in one first pixel are arranged along the first direction, and the first and second subsections in the other first pixel are arranged in the direction perpendicularly to the first direction; 
     where the first direction is the column or row direction. 
     In one or more embodiments, as illustrated in  FIG.  6   , for each first pixel arranged in the column direction, both the first subsection F 1  and the second subsection F 2  are arranged along the column direction; and for each first pixel arranged in the row direction, both the first subsection F 1  and the second subsection F 2  are arranged along the row direction. 
     In one or more embodiments, by taking the structural schematic diagram of the adjacent first pixels as illustrated in  FIG.  9    as an example, two first pixels marked as P 14  and P 15  are arranged adjacently in the X direction; where the first subsection F 1  and the second subsections F 2  in the first pixel P 14  are arranged along the Y direction, and the first subsection F 1  and the second subsections F 2  in the first pixel P 15  are arranged along the X direction. 
     Similarly, two first pixels marked as P 14  and P 16  are arranged adjacently in the Y direction; where the first subsection F 1  and the second subsections F 2  in the first pixel P 14  are arranged along the Y direction, and the first subsection F 1  and the second subsections F 2  in the first pixel P 16  are arranged along the X direction. 
     Thus, by setting the arranging direction of the first subsection F 1  and the second subsections F 2  in the first pixel, not only the space occupied by the first pixel in the photosensitive device arranging region G can be adjusted to leave more space for the light-transmission region and further improve the light transmittance of the photosensitive device arranging region G, but also the area of the opening region of the first pixel can be adjusted. Since the pixels include the first pixels located in the photosensitive device arranging region G and the second pixels located in the normal display region A 1 , and the arranging density of the first pixels is less than the arranging density of the second pixels, the area of the opening region of the first pixel can be adjusted to reduce the display brightness difference due to the low arranging density of the first pixels and to further improve the display uniformity. 
     Second Way: 
     In one or more embodiments, signal line S 0  is introduced and the relationship between the signal lines S 0  (as illustrated in  FIGS.  3 - 7   ) and the first pixels is described at first. 
     In one or more embodiments of the disclosure, M adjacent first signal lines located in the photosensitive device arranging region form a first signal line group, and the spacing between the adjacent first signal line groups is larger than the spacing between two adjacent first signal lines in one first signal line group; the orthographic projections of all the first signal lines in the first signal line group and the orthographic projection of one second signal line on the base substrate have M overlap areas, and the M overlap areas are located in the orthographic projection of at least one first pixel on the base substrate; 
     and/or, N adjacent second signal lines located in the photosensitive device arranging region form a second signal line group, and the spacing between the adjacent second signal line groups is larger than the spacing between two adjacent second signal lines in one second signal line group; the orthographic projections of all the second signal lines in the second signal line group and the orthographic projection of one first signal line on the base substrate have N overlap areas, and the N overlap areas are located in the orthographic projection of at least one first pixel on the base substrate; 
     where M and N are both integers greater than 1. 
     In one embodiment, referring to  FIG.  3   , Z 1  represents one first signal line group which includes two first signal lines S 1 , the spacing between two adjacent first signal line groups Z 1  is represented by h 1 , and the spacing between two adjacent first signal lines S 1  in the first signal line group Z 1  is represented by h 2 , where h 1  is larger than h 2 . The orthographic projections of each first signal line group Z 1  and one second signal line S 2  on the base substrate have two overlap areas, i.e., M is 2, where these two overlap areas are located in the orthographic projection of one first pixel (e.g., the first pixel marked as P 11  in  FIG.  3   ) on the base substrate. 
     In another embodiment, referring to  FIG.  7   , there are the first signal line group (consisted of two first signal lines arranged closely) and the second signal line group (consisted of two second signal lines arranged closely), each first signal line group includes two first signal lines S 1 , each second signal line group includes two second signal lines S 2 , and the orthographic projections of each first signal line group and each second signal line group on the base substrate have four overlap areas, where the number of the overlap areas can be understood as M*N, that is, M is 2, N is 2, so M*N is 4, and these four overlap areas are located in the orthographic projection of one first pixel (e.g., the first pixel marked as P 13  in  FIG.  7   ) on the base substrate. 
     As can be seen, the setting of signal line group(s) can facilitate the implementation of locating overlap areas in the orthographic projection of one first pixel on the base substrate, to facilitate improving the light transmittance of the photosensitive device arranging region G. 
     Based on this, in order to further improve the light transmittance of the photosensitive device arranging region G, in one or more embodiments, as illustrated in  FIGS.  4 - 7   , the length of the spacing in the first direction between two adjacent first pixels electrically connected to the signal lines in the same signal line group is the first length, and the length of the spacing in the first direction between the first pixels which are electrically connected to the signal lines in two adjacent signal line groups respectively and are adjacent in the first direction is the second length, where the first length is smaller than the second length; 
     where the signal lines are the first signal lines, the signal line groups are the first signal line groups, the first direction is the column direction; and/or the signal lines are the second signal lines, the signal line groups are the second signal line groups, the first direction is the row direction. 
     In one embodiment, referring to  FIG.  4   , for the first signal line group marked as Z 2 , the first pixels electrically connected to the first signal line group Z 2  are marked as P 18 , P 19  and P 20  respectively, and the first pixel marked as P 17  is the first pixel electrically connected to the first signal line group marked as Z 3 . 
     Here, among the respective first pixels (e.g., P 18 , P 19  and P 20 ) electrically connected to the first signal line group Z 2  and the respective first pixels (only P 17  is shown in the figure) electrically connected to the first signal line group Z 3 , two first pixels adjacent in the Y direction are P 17  and P 18  respectively, the spacing between them is the second length and represented by h 4 , and the spacing in the Y direction between two adjacent first pixels electrically connected to the signal lines in the first signal line group Z 2  is the first length and represented by h 3 , where h 3  is smaller than h 4 . 
     Thus, the first pixels electrically connected to the signal lines in the same signal line group are arranged more closely, to reduce the first length between these first pixels, so that more space can be left for the light-transmission region to further improve the light transmittance of the photosensitive device arranging region G. 
     In one or more embodiments of the disclosure, the signal line group includes at least three signal lines, and all the first lengths are the same. As illustrated in  FIG.  4   , the first length of any two first pixels of the first pixels P 18 , P 19  and P 20  in the first direction is h 3 . 
     Thus, the structure complexity of the electroluminescent display panel can be simplified, and the difficulty of fabricating the electroluminescent display panel can be lowered. 
     Third Way: 
     In one or more embodiments of the disclosure, the orthographic projections of at least a part of the first pixels on the base substrate have overlap areas. 
     In one or more embodiments, the orthographic projections of a part of the first pixels on the base substrate have overlap areas. In one embodiment, as illustrated in  FIG.  9   , the orthographic projection of each of the first pixels marked as P 14  and P 15  on the base substrate has two overlap areas, and the orthographic projection of the first pixel marked as P 16  on the base substrate has no overlap area. 
     Thus, a part of the first signal lines S 1  and a part of the second signal lines S 2  are arranged more intensively, to leave the more and more concentrated space as the light-transmission region to some extent, so that the light transmittance of the photosensitive device arranging region G can be increased to some extent. 
     In one or more embodiments, the orthographic projections of all the first pixels on the base substrate have overlap areas. In one embodiment, as illustrated in  FIG.  10   , the region filled with the sparse black spots represents a part of the photosensitive device arranging region G, and as shown, the orthographic projection of each of three first pixels located in this region on the base substrate has two overlap areas. 
     Thus, on the one hand, the first signal lines S 1  and the second signal lines S 2  can be arranged more intensively to the most extent, in order to leave the more and more concentrated space as the light-transmission region, so that the light transmittance of the photosensitive device arranging region G can be increased as much as possible, to provide more lights to the camera or fingerprint recognition device so that the camera or fingerprint recognition device can work normally and efficiently. On the other hand, different settings can be performed according to the actual demand, to increase the design flexibility and also meet the requirements of different application scenarios. 
     Based on this, in one or more embodiments of the disclosure, the orthographic projections of a part of the first pixels on the base substrate have overlap areas, and the orthographic projections of the other first pixels on the base substrate have no overlap area; 
     the area of the orthographic projection of the first pixel corresponding to no overlap area on the base substrate is smaller than the area of the orthographic projection of the first pixel corresponding to overlap areas on the base substrate. 
     In one embodiment, by taking the structure shown in  FIG.  9    as an example, the orthographic projection of each of the first pixels marked as P 14  and P 15  on the base substrate has two overlap areas, and the orthographic projection of the first pixel marked as P 16  on the base substrate has no overlap area, where the area of the orthographic projection of the first pixel P 14  on the base substrate is larger than the area of the orthographic projection of the first pixel P 16  on the base substrate. 
     Thus, the space occupied by the first pixel corresponding to no overlap area can be reduced, to leave more space as the light-transmission region and further improve the light transmittance of the photosensitive device arranging region G. 
     In one or more embodiments of the disclosure, the areas of the orthographic projections of all the first pixels on the base substrate are the same, as illustrated in  FIGS.  3 - 7  and  10   . Thus, the difficulty of fabricating the first pixel may be lowered greatly, and then the difficulty of fabricating the electroluminescent display panel is lowered, to improve the production efficiency and the product yield of the display devices. 
     It is necessary to note that the three ways described above can be used in combination or used separately in the actual situation, which is not limited here, and can be set and selected according to the actual demand, to increase the design flexibility and also meet the requirements of different application scenarios. 
     In one embodiment, for the structure as illustrated in  FIG.  2   , the normal display region A 1  surrounds the photosensitive device arranging region G Even if the arranging density of the first pixels is less than the arranging density of the second pixels, the second signal lines S 2  extends to the photosensitive device arranging region G and passes through the photosensitive device arranging region G to the normal display region A 1 , so there are redundant second signal lines S 2  arranged in the photosensitive device arranging region G at this time. In order to reduce the shielding of the second signal lines S 2  for the light, the second signal lines S 2  can be arranged according to the embodiments of the disclosure. 
     For the structure as illustrated in  FIG.  1   , the photosensitive device arranging region G is located at the edge of one side of the display region A closed to the non-display region B. In one or more embodiments, since the arranging density of the first pixels is less than the arranging density of the second pixels, a part of the second signal lines S 2  are set to extend into the photosensitive device arranging region G, to decrease the number of the second signal lines S 2  arranged in the photosensitive device arranging region G and further improve the light transmittance of the photosensitive device arranging region G. 
     Similarly, in one or more embodiments, for the structure as illustrated in  FIG.  1   , all the second signal lines S 2  is set to extend into the photosensitive device arranging region G, to facilitate reducing the load differences among all the second signal lines S 2 . At this time, in order to reduce the shielding of the second signal lines S 2  for the light, there is also a need to arrange the second signal lines S 2  according to the embodiments of the disclosure. 
     Similarly, there is also a need to arrange the first signal lines S 1  according to the embodiments of the disclosure. 
     Therefore, in an embodiment of the disclosure, the shapes of the orthographic projections of the first signal lines S 1  and/or the second signal lines S 2  passing through the photosensitive device arranging region G on the base substrate can be the folded-line shape, as illustrated in  FIG.  10   . 
     Thus, it is possible to facilitate the closer arrangement of all the signal lines (including the first signal lines S 1  and the second signal lines S 2 ) in the photosensitive device arranging region G to provide the larger light-transmission region, to locate overlap areas in the orthographic projection of one first pixel on the base substrate and improve the light transmittance of the photosensitive device arranging region G. 
     In one or more embodiments, in order to implement the above-mentioned arrangement of the signal lines, each of the first signal lines and/or the second signal lines passing through the photosensitive device arranging region includes: a first segment, a second segment, and a third segment connecting the first and second segments, where the first segment is located in the normal display region and extends along the second direction, the second segment is located in the photosensitive device arranging region and extends along the second direction, and the third segment extends along the third direction; 
     where the third direction intersects with the row direction and the column direction respectively; the first signal line includes: a first segment, a second segment and a third segment, and the second direction is the row direction; the second signal line includes: a first segment, a second segment and a third segment, and the second direction is the column direction. 
     In one embodiment, referring to the structure as illustrated in  FIG.  10   , the second signal line at the rightmost in the figure is marked as S 21 , and this second signal line S 21  includes: a first segment D 1 , a second segment D 2 , and a third segment D 3  connecting the first segment D 1  and the second segment D 2 , where both the first segment D 1  and the second segment D 2  extend along the Y direction, and the third segment D 3  extends along the third direction (i.e., K direction as illustrated in the figure). 
     Thus, the shape of the orthographic projection of the signal line on the base substrate can be set to be the folded-line shape by the segmentation of the signal line, facilitating the closer arrangement of all the signal lines (including the first signal lines S 1  and the second signal lines S 2 ) in the photosensitive device arranging region G to provide the larger light-transmission region, to locate overlap areas in the orthographic projection of one first pixel on the base substrate and improve the light transmittance of the photosensitive device arranging region G. 
     Based upon the same inventive concept, one or more embodiments of the disclosure provides a display device  100 , and as illustrated in  FIG.  11    which is a structural schematic diagram of the display device, the display device  100  includes the electroluminescent display panel  10  described above and provided by the embodiments of the disclosure. 
     Here, as illustrated in  FIG.  11   , an photosensitive device  20  is arranged at the place corresponding to the photosensitive device arranging region G of the electroluminescent display panel  10 , and the photosensitive device  20  may be a camera or fingerprint recognition device. 
     In one or more embodiments, the display device may be a mobile phone, a tablet, a television, a display, a laptop, a digital photo frame, a navigator, or any other product or component with display functions. The implementations of this display device can refer to the embodiments of the electroluminescent display panel described above, and this display device also has the beneficial effects owned by the electroluminescent display panel described above, and the repeated description thereof will be omitted here. 
     For the electroluminescent display panel and the display device provided by the embodiments of the disclosure, firstly the display region includes a photosensitive device arranging region, and a camera or fingerprint recognition device is arranged in the photosensitive device arranging region, rather than in the frame, and thus a relatively larger area occupying in the frame is avoided, to allow the frame be made narrower, and the screen-to-body ratio be increased. 
     Secondly for the photosensitive device arranging region, the first signal lines and the second signal lines are arranged more intensively by arranging overlap areas in the orthographic projection of one first pixel on the base substrate, to allow the display panel have more concentrated space as the light-transmission region, so that the light transmittance of the photosensitive device arranging region can be increased to provide more lights to the camera or fingerprint recognition device so that the camera or fingerprint recognition device can work normally and efficiently.