Display panel and display device

Abstract

A display panel and a display device are provided. The display panel comprises a substrate (101), a plurality of light emitting devices (102) located on the substrate (101), a plurality of light sensitive devices (103) located on the substrate (101), a projection of each light sensitive device (103) on the substrate (101) is located at a gap between projections of adjacent light emitting devices (102) on the substrate (101), a plurality of light shielding portions (104) located on a side of a layer of each light emitting device (102) away from the substrate (101), each light shielding portion (104) is arranged in one-to-one correspondence with each light sensitive device (103), and a projection of the light shielding portion (104) on the substrate (101) at least partially overlaps with a projection of the corresponding light sensitive device (103) on the substrate (101).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, and in particular, to a display panel and a display device. BACKGROUND

[0002] With the continuous development of terminal technology, electronic devices are increasingly widely used. In order to protect the information security of users, the use of fingerprint recognition function on electronic devices is becoming more and more common, such as for mobile phone unlocking, mobile payment (such as payment, transfer), etc.

[0003] As a current light-emitting device, an organic light emitting diode (OLED) has the advantages of self-luminous, fast response, wide viewing angle, and can be made into flexible products, and is widely used in high-performance display field. In the related art, an OLED display screen with an optical fingerprint recognition function uses all areas in an active display area (A-A area) as an optical fingerprint recognition area, and uses light emitted by the OLED display screen itself as a light source for optical fingerprint recognition. Specifically, the self-emitted light is reflected by a finger above the display screen, returns to the display screen, and is transmitted to a photosensitive device. The photosensitive device generates different electrical signals according to the difference in light reflection intensity of the fingerprint ridge and the fingerprint valley, and realizes fingerprint recognition. SUMMARY

[0004] The display panel provided by the embodiments of the present disclosure comprises:

[0005] a substrate substrate;

[0006] a plurality of light-emitting devices located on the substrate substrate;

[0007] a plurality of photosensitive devices located on the substrate substrate, wherein a normal projection of each of the photosensitive devices on the substrate substrate is located at a gap between normal projections of adjacent light-emitting devices on the substrate substrate.

[0008] a plurality of light-shielding portions located on a side of a layer where each of the light-emitting devices is located away from the substrate substrate, wherein each of the light-shielding portions is arranged one-to-one corresponding to each of the photosensitive devices, and a normal projection of each of the light-shielding portions on the substrate substrate at least partially overlaps with a normal projection of the corresponding photosensitive device on the substrate substrate.

[0009] Optionally, in the display panel provided by the embodiments of the present disclosure, the normal projection of the light-shielding portion on the substrate substrate is located within the normal projection of the corresponding photosensitive device on the substrate substrate.

[0010] Optionally, in the display panel provided by the embodiments of the present disclosure, the normal projection of the light-shielding portion on the substrate substrate has a shape similar to that of the normal projection of the corresponding photosensitive device on the substrate substrate, and the shape centers coincide.

[0011] Optionally, in the display panel provided by the embodiment of the present disclosure, the light shielding part has a rectangular shape in the orthographic projection on the substrate, and the length of the orthographic projection of the light shielding part on the substrate is less than or equal to 1 / 2 of the length of the orthographic projection of the photosensitive device on the substrate.

[0012] Optionally, in the display panel provided by the embodiment of the present disclosure, the length of the orthographic projection of the light shielding part on the substrate is equal to 1 / 3 of the length of the orthographic projection of the photosensitive device on the substrate.

[0013] Optionally, in the display panel provided by the embodiment of the present disclosure, the photosensitive device has a square shape in the orthographic projection on the substrate, and the length of the square is greater than or equal to 10 μm and less than or equal to 20 μm.

[0014] Optionally, in the display panel provided by the embodiment of the present disclosure, each of the photosensitive devices is located between the layer where each of the light emitting devices is located and the substrate.

[0015] Optionally, in the display panel provided by the embodiment of the present disclosure, the substrate comprises a plurality of fingerprint recognition areas arranged in an array.

[0016] Each of the fingerprint recognition areas comprises at least two of the photosensitive devices, and each of the photosensitive devices in each of the fingerprint recognition areas is rotationally symmetrically distributed relative to the center of the fingerprint recognition area where the photosensitive device is located.

[0017] Optionally, in the display panel provided by the embodiment of the present disclosure, in the same fingerprint recognition area, the number of the photosensitive devices in each row is different, and the sum of the lengths of all the photosensitive devices is twice the sum of the widths.

[0018] Optionally, in the display panel provided by the embodiment of the present disclosure, in the same fingerprint recognition area, the number of the photosensitive devices in each row is the same, and the shapes of the two photosensitive devices that are symmetric about the center of the fingerprint recognition unit are the same.

[0019] Optionally, in the display panel provided by the embodiment of the present disclosure, further comprising: an encapsulation layer located between the layer where each of the light emitting devices is located and the layer where each of the light shielding parts is located.

[0020] Optionally, in the display panel provided by the embodiment of the present disclosure, further comprising: a touch electrode layer located on the side of the layer where the light shielding parts are located away from the substrate.

[0021] Optionally, in the display panel provided by the embodiment of the present disclosure, the light emitting device comprises an anode, and the display panel further comprises a plurality of bias lines arranged in the same layer as the anode.

[0022] Each of the bias lines is electrically connected to the photosensitive device in a row of the fingerprint recognition area.

[0023] Optionally, in the display panel provided by the embodiment of the present disclosure, a plurality of first transistors and a plurality of second transistors are arranged between the substrate and the layer where the photosensitive device is located.

[0024] Each of the first transistors is electrically connected to the light emitting device one by one, each of the second transistors is electrically connected to the photosensitive device one by one, and the same film layer of the first transistor and the same film layer of the second transistor are arranged in the same layer.

[0025] Based on the same inventive concept, the embodiment of the present disclosure also provides a display device comprising the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A schematic diagram of the planar structure of the display panel provided by the embodiment of the present disclosure;

[0027] Figure 2 A schematic diagram of the cross-sectional structure of the fingerprint recognition area provided by the embodiment of the present disclosure;

[0028] Figure 3 A schematic diagram of the spatial position of the photosensitive device and the light shielding part provided by the embodiment of the present disclosure;

[0029] Figure 4 Another schematic diagram of the spatial position of the photosensitive device and the light shielding part provided by the embodiment of the present disclosure;

[0030] Figure 5 A schematic diagram of the design principle of the size relationship between the photosensitive device and the light shielding part provided by the embodiment of the present disclosure;

[0031] Figure 6 A transmittance curve of the signal light provided by the embodiment of the present disclosure;

[0032] Figure 7 A transmittance curve of the external ambient light provided by the embodiment of the present disclosure;

[0033] Figure 8 A signal-to-noise ratio curve provided by the embodiment of the present disclosure;

[0034] Figure 9 An image of a fingerprint;

[0035] Figure 10 A fingerprint recognition imaging diagram in the related art;

[0036] Figure 11 A schematic diagram of a planar structure of a fingerprint identification area provided by an embodiment of the present disclosure;

[0037] Figure 12 Another schematic diagram of a planar structure of a fingerprint identification area provided by an embodiment of the present disclosure;

[0038] Figure 13 A fingerprint identification imaging diagram of an embodiment of the present disclosure;

[0039] Figure 14 A schematic diagram of a cross-sectional structure of a display panel provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0040] In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings of the embodiments of the present disclosure. The thickness and shape of each film layer in the drawings do not reflect the true proportion, and the purpose is only to schematically illustrate the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure.

[0041] Unless otherwise defined, technical terms or scientific terms used herein should be understood as having the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first", "second", and similar terms used in the specification and claims of the present disclosure do not denote any order, quantity, or importance, but are used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the term encompass the elements or objects listed after the term and their equivalents, without excluding other elements or objects. "In", "out", "up", "down", and the like are used only to represent relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0042] In the process of fingerprint identification, in addition to the signal light emitted by the sub-pixels being sensed by the photosensitive device, the ambient light incident through the finger and the like is also sensed by the photosensitive device. Since the photosensitive device passively receives light and does not actively distinguish the light emitted by the sub-pixels from the ambient light, the ambient light may interfere with the fingerprint identification of the photosensitive device, resulting in blurred or even unimaged fingerprint lines.

[0043] To solve the above problems in the related art, an embodiment of the present disclosure provides a display panel, as shown in Figure 1 and Figure 2 The display panel comprises:

[0044] a substrate substrate 101;

[0045] a plurality of light emitting devices 102 located on the substrate substrate 101;

[0046] a plurality of light sensitive devices 103 located on the substrate substrate 101, and a projection of each light sensitive device 103 on the substrate substrate 101 is located at a gap of a projection of an adjacent light emitting device 102 on the substrate substrate 101;

[0047] a plurality of light shielding portions 104 located on a side of a layer of each light emitting device 102 away from the substrate substrate 101, each light shielding portion 104 is arranged in one-to-one correspondence with each light sensitive device 103, and a projection of the light shielding portion 104 on the substrate substrate 101 at least partially overlaps with a projection of the corresponding light sensitive device 103 on the substrate substrate 101.

[0048] In the display panel provided in the embodiments of the present disclosure, the light shielding portion 104 at least partially overlaps with the light sensitive device 103 to shield ambient light, which to some extent avoids the ambient light from irradiating the light sensitive device 103, so that most of the light received by the light sensitive device 103 is signal light, effectively avoiding the influence of ambient light on signal light, and improving the optical signal-to-noise ratio (SNR).

[0049] It should be understood that, since the light shielding portion 104 is located on the light emitting side of the light emitting device 102, in order to avoid the influence of the light shielding portion 104 on the picture display, the region corresponding to the light emitting device 102 in the layer where the light shielding portion 104 is located can be provided with an opening. In addition, the light shielding portion 104 can be made of black resin such as black matrix (BM) material, black SU8 material, black pixel definition layer (PDL) material, etc., and the opening can be made by using a photolithography process or a nanoimprint process.

[0050] It should be noted that, in the process of fingerprint identification, when the light emitted by the point light source is irradiated onto the fingerprint pressing interface (for example, the outer surface of the display screen) at different angles, due to the total reflection of the fingerprint pressing interface, the part (i.e. 42°-70°) of the light with an incident angle greater than or equal to the critical angle of total reflection (the critical angle of total reflection between the general display device and air is about 42°, and the maximum exit angle of the point light source is 70°) will be totally reflected, resulting in a total reflection area. Correspondingly, the part of the light with an incident angle less than the critical angle of total reflection 42° will exit from the fingerprint pressing interface. Therefore, the light reflected by the total reflection area can be used for ridge image acquisition. Specifically, when the fingerprint of the user's finger presses the total reflection area, the ridges of the fingerprint touch the surface of the total reflection area, so the total reflection condition at the position corresponding to the ridges of the fingerprint is destroyed, and therefore the light will exit at the corresponding position, so that the original reflection path is changed. The valleys of the fingerprint will not touch the surface of the total reflection area, so the total reflection condition at the position corresponding to the valleys of the fingerprint is not destroyed, and therefore the light will still be totally reflected at the corresponding position, so that the original reflection path is not changed. In this way, due to the different influences of the valleys and ridges of the fingerprint on the total reflection condition, the light incident onto the fingerprint imaging interface forms a ridge image with light and shade at different positions.

[0051] Optionally, in the display substrate provided in the embodiments of the present disclosure, Figure 1 as shown, the orthographic projection of the light shielding part 104 on the substrate 101 is located within the orthographic projection of the photosensitive device 103 on the substrate 101.

[0052] As can be seen from the above, the light with an exit angle of 42°-70° in the light emitted by the point light source belongs to the effective imaging range of fingerprint identification, and therefore, in order to avoid the signal light in this range being reflected by the finger and being unable to irradiate the photosensitive device 103 due to the light shielding part 104 being too large, it is necessary to set the orthographic projection of the light shielding part 104 on the substrate 101 to be located within the orthographic projection of the photosensitive device 103 on the substrate 101.

[0053] Specifically, the orthographic projection shape of the light shielding part 104 on the substrate 101 and the orthographic projection shape of the photosensitive device 103 on the substrate 101 are various, for example, can be rectangular (including square), trapezoidal, polygonal, etc. For the convenience of understanding, in the present disclosure, the orthographic projection shape of the light shielding part 104 on the substrate 101 and the orthographic projection shape of the photosensitive device 103 on the substrate 101 are taken as square as an example, and the size relationship between the photosensitive device 103 and the light shielding part 104 is described.

[0054] The light rays emitted by the point light source and corresponding to the return light rays with angles between θ1 and θ2 can eventually be emitted to the photosensitive device 103. The maximum angle of the external ambient light that can enter the interior of the OLED is θ3. h is the distance between the layer where the light shielding portion 104 is located and the layer where the photosensitive device 103 is located. It is assumed that the shape of the photosensitive device 103 is a square with a side length of d, and the shape of the light shielding portion 104 is a square with a side length of D. Figures 3 to 5 As shown. Theoretically, they should satisfy the following relationship: D = d + 2h * tan (θ1 ~ θ2). According to the process thickness design capability value h range of 6μm ~ 14μm, the size range of d is generally designed to be 10μm ≤ d ≤ 20μm; and it is well known to those skilled in the art that the effective range of point light source imaging is 42° ~ 70°, corresponding to θ1 is 40° and θ2 is 35°. Then, from formula (1), it can be calculated that the size range of D is 20μm ≤ D ≤ 40μm.

[0055] According to the performance of the photosensitive device 103 and the fingerprint optical signal-to-noise ratio to be met, the size relationship between the light shielding portion 104 and the photosensitive device 103 will be further optimized. Specifically, considering the transmittance of the signal light during display, the light shielding portion 104 needs to be smaller than the photosensitive device 103 during actual production. Figure 5 The light efficiency of the design is evaluated, the occlusion of light signal and ambient light is studied respectively, and the corresponding relationship between d and D is optimized. Figure 6 The figure shows the transmittance of signal light when d is fixed at 18μm and D is taken at different values. The signal light sequentially passes through the layers above the light-emitting layer to the finger, then reflects off the finger and passes through the layers above the photosensitive device 103 to illuminate the photosensitive device 103. Specifically, S1, S2, S3, S4, and S5 correspond to D values ​​of 6μm, 12μm, 18μm, 24μm, and 30μm, respectively. S6 represents a comparative example when d is 18μm and there is no light shielding portion 104. Figure 7 The figure shows the transmittance of ambient light when it sequentially passes through the layers above photosensor 103 and reaches photosensor 103, when d is fixed at 18 μm and D takes different values. Specifically, N1, N2, N3, N4, and N5 correspond to D values ​​of 6 μm, 12 μm, 18 μm, 24 μm, and 30 μm, respectively. N6 represents a comparative example, where d is 18 μm and there is no light shielding portion 104. Figure 8 The figure shows the signal-to-noise ratio when d is fixed at 18 μm and D takes different values. Specifically, R1, R2, R3, R4, and R5 correspond to D values ​​of 6 μm, 12 μm, 18 μm, 24 μm, and 30 μm, respectively. R6 represents a comparative embodiment when d is 18 μm and there is no light shielding portion 104. Figures 6 to 8Therefore, to ensure that the optical signal-to-noise ratio has a relatively large value in the effective imaging range (42°-70°) of the point light source, the size of the light shielding portion 104 is 12 μm, that is, the side length D of the light shielding portion 104 is preferably about 1 / 3 of the side length d of the photosensitive device 103, and correspondingly, the area (D 2 ) of the light shielding portion 104 is preferably about 1 / 9 of the area (d 2 ) of the photosensitive device 103. That is, to improve the signal-to-noise ratio and obtain a better fingerprint recognition effect, in the case where the orthographic projection shape of the light shielding portion 104 on the substrate 101 is similar to the orthographic projection shape of the corresponding photosensitive device 103 on the substrate 101 and the shape centers coincide, the side length of the orthographic projection of the light shielding portion 104 on the substrate 101 needs to be about 1 / 3 of the side length of the orthographic projection of the corresponding photosensitive device 103 on the substrate 101, for example, greater than 0 and less than or equal to 1 / 2, and preferably 1 / 3.

[0056] It should be noted that, in the present disclosure, the orthographic projection shape of the light shielding portion 104 on the substrate 101 is similar to the orthographic projection shape of the photosensitive device 103 on the substrate 101, which means that the shapes of the two are the same or substantially the same.

[0057] Optionally, in the above display panel provided in the embodiments of the present disclosure, each photosensitive device 103 is located between the layer where each light emitting device 102 is located and the substrate 101. In this way, after the fabrication of the photosensitive device 103 on the substrate 101 is completed, the light emitting device 102 is fabricated by using related technologies, thereby achieving good compatibility with the existing fabrication process and a relatively simple fabrication process.

[0058] In related technologies, the substrate 101 has a plurality of fingerprint recognition areas arranged in an array, but the photosensitive devices in each fingerprint recognition area are unevenly distributed, resulting in uneven final fingerprint imaging. Specifically, Figure 9 for a fingerprint, Figure 10 as shown in the fingerprint recognition imaging diagram of related technologies, it can be seen that the fingerprint recognition effect is poor.

[0059] Based on this, in the above display panel provided in the embodiments of the present disclosure, as shown in Figure 11 and Figure 12 , at least two photosensitive devices 103 are included in each fingerprint recognition area, and each photosensitive device 103 in each fingerprint recognition area is arranged in rotational symmetry about the center O of the fingerprint recognition area, so that the photosensitive devices 103 are evenly distributed in each fingerprint recognition area, thereby achieving accurate recognition of the fingerprint, as shown in Figure 13 . Specifically, Figure 11 in the specific embodiment, five photosensitive devices 103 are included in each fingerprint recognition area, Figure 12Specifically, a fingerprint recognition area includes six photosensitive devices 103. Of course, in a specific implementation, a fingerprint recognition area may also include other numbers of photosensitive devices 103, such as four, eight, etc., which is not specifically limited here.

[0060] Optionally, in the display panel provided in the embodiment of the present disclosure, a uniform design of the photosensitive devices 103 in the same fingerprint recognition area can be achieved by the following two methods:

[0061] One way to implement this is Figure 11 As shown, in the same fingerprint recognition area, the number of photosensitive devices 103 in each row is different ( Figure 11 As an example, two rows of photosensitive devices 103 are given, where one row includes three photosensitive devices 103 and the other row includes two photosensitive devices 103. The sum of the lengths of all photosensitive devices 103 is twice the sum of their widths, i.e., 2*(L AK +L CK +L BK +L A’K +L C’K )=L AL +L CL +L BL +L A’L +L C’L , where L AK , L AL A represents the width and length of the photosensitive device 103, L BK , L BL B represents the width and length of the photosensitive device 103, L CK , L CL C represents the width and length of the photosensitive device 103, L A’K , L A’L A' represents the width and length of the photosensitive device 103, L C’K , L C’L C' represents the width and length of the photosensitive device 103, respectively.

[0062] Another way to implement it is Figure 12 As shown, in the same fingerprint recognition area, the number of photosensitive devices 103 in each row is the same ( Figure 12 Two rows of photosensitive devices 103 are shown as an example, and each row includes three photosensitive devices 103. The two photosensitive devices 103 symmetrical about the center O of the fingerprint recognition area have the same shape. Figure 5In the case that A represents the position of the photosensitive device 103 and A' represents the position of the photosensitive device 103 symmetric about the center O of the fingerprint identification area, A represents the shape of the photosensitive device 103 and A' represents the shape of the photosensitive device 103 which are the same; in the case that B represents the position of the photosensitive device 103 and B' represents the position of the photosensitive device 103 symmetric about the center O of the fingerprint identification area, B represents the shape of the photosensitive device 103 and B' represents the shape of the photosensitive device 103 which are the same; in the case that C represents the position of the photosensitive device 103 and C' represents the position of the photosensitive device 103 symmetric about the center O of the fingerprint identification area, C represents the shape of the photosensitive device 103 and C' represents the shape of the photosensitive device 103 which are the same. It should be noted that in the present disclosure, "the same shape" means the same area and the same size. In addition, Figure 5 In the case that the shape of the photosensitive device 103 is exemplarily given as a rectangle, in specific implementation, it can also be a square or other shapes, which are not limited in specific.

[0063] Optionally, in the display panel provided by the embodiment of the present disclosure, as shown in Figure 2 , the display panel further comprises an encapsulation layer 105 between the layer where each light emitting device 102 is located and the layer where each light shielding part 104 is located.

[0064] By setting the light shielding part 104 above the encapsulation layer 105, it is equivalent to adding a process to manufacture the light shielding part 104 after the related technology completes each film layer of the substrate 101 to the encapsulation layer 105, so as to realize good compatibility with the existing manufacturing process.

[0065] Optionally, in the display panel provided by the embodiment of the present disclosure, as shown in Figure 2 , the display panel further comprises a touch electrode layer 106 on the side of the layer where each light shielding part 104 is located away from the substrate 101, so as to realize the integration of the touch function and the display function. Specifically, the touch electrode layer 106 and the layer where the light shielding part 104 is located can be attached through the first optical adhesive 107. In specific implementation, the touch electrode layer 106 can be a self-capacitance electrode layer or a mutual-capacitance electrode layer, which is not limited here.

[0066] Optionally, in the display panel provided by the embodiment of the present disclosure, as shown in Figure 2 and Figure 14 , the light emitting device 102 comprises an anode 1021, and the display panel further comprises a plurality of bias lines 108 arranged in the same layer as the anode 1021.

[0067] Each bias line 108 is electrically connected to the photosensitive device 103 in a row of the fingerprint identification area.

[0068] It should be noted that in the present disclosure, "same layer" refers to layers of the same material, which are obtained by using the same film forming process to form a film layer for a specific pattern, and then formed by using the same mask plate through a one-time patterning process. That is, one-time patterning process corresponds to one mask plate (also known as a photomask). According to different specific patterns, the one-time patterning process can include multiple exposure, development or etching processes, and the specific patterns in the formed layer structure can be continuous or discontinuous, and these specific patterns can also be at different heights or have different thicknesses. Based on this, the bias line 108 is arranged in the same layer as the anode, which simplifies the manufacturing process. Moreover, the bias line 108 is used to load a bias voltage to the photosensitive device 103 during the fingerprint recognition process.

[0069] Optionally, in the display panel provided in the embodiments of the present disclosure, as shown in Figure 14 , the display panel further comprises a plurality of first transistors 109 and a plurality of second transistors 110 between the substrate 101 and the layer where the photosensitive device 103 is located.

[0070] Each first transistor 109 is electrically connected to each light emitting device 102 one by one, so as to realize independent driving of the light emitting device 102; each second transistor 110 is electrically connected to each photosensitive device 103 one by one, so as to realize address reading of the electrical signal of the photosensitive device 103; the film layers of the first transistor 109 and the same film layers of the second transistor 110 are arranged in the same layer, which simplifies the manufacturing process. Specifically, the active layer 1091 of the first transistor 109 and the active layer 1101 of the second transistor 110 are arranged in the same layer, the gate 1092 of the first transistor 109 and the gate 1102 of the second transistor 110 are arranged in the same layer, and the source / drain electrode 1093 of the first transistor 109 and the source / drain electrode 1103 of the second transistor 110 are arranged in the same layer.

[0071] Generally, in the display panel provided in the embodiments of the present disclosure, as shown in Figure 2 and Figure 14As shown, the display panel can further include a protective cover plate 111, a second optical clear adhesive 112, a spacer 113, a pixel defining layer (MCC-PDL) 114 having a function of blocking ambient light, a planarization layer 115, a buffer layer 116, a sidewall protection layer 117, an insulating layer 119, an interlayer dielectric layer 119, a first gate insulating layer 120, and a second gate insulating layer 121. The light emitting device 102 generally includes an anode 1021, a light emitting functional layer 1022 (at least including a hole injection layer, a hole transport layer, an electron blocking layer, an organic electroluminescent layer or a quantum dot light emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer), and a cathode 1023. In the case of the photosensitive device 103 being a PIN type photodiode, the photosensitive device 103 can include a bottom electrode 1031, a P-type semiconductor layer 1032, an intrinsic semiconductor layer 1033, an N-type semiconductor layer 1034, and a top electrode 1035, wherein the bias voltage line 108 is electrically connected to the top electrode 1035 through a via hole of the planarization layer 115. In combination Figure 2 、 Figure 3 With Figure 14 It can be seen that the distance h between the layer where the light shielding part 104 is located and the layer where the photosensitive device 103 is located is the sum of the thicknesses of the sidewall protection layer 117, the planarization layer 115, the pixel defining layer 114, the cathode 1023, and the encapsulation layer 105.

[0072] Based on the same inventive concept, the embodiments of the present disclosure further provide a display device including the display panel provided by the embodiments of the present disclosure. The display device can be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, a smart watch, a fitness wristband, a personal digital assistant, and the like. Other essential components of the display device are understood by those skilled in the art and are not described here in detail, nor should they be considered as limiting the present disclosure. In addition, since the principle of solving the problem of the display device is similar to that of the above-mentioned display panel, the implementation of the display device can refer to the embodiments of the above-mentioned display panel, and the repeated parts are not described here in detail.

[0073] The display panel and display device provided by the embodiments of the present disclosure include a substrate, a plurality of light emitting devices on the substrate, a plurality of light sensitive devices on the substrate, a projection of each light sensitive device on the substrate being located at a gap between projections of adjacent light emitting devices on the substrate, and a plurality of light shielding portions on a side of each light emitting device away from the substrate, each light shielding portion corresponding to each light sensitive device, and a projection of each light shielding portion on the substrate at least partially overlapping with a projection of the corresponding light sensitive device on the substrate. The light shielding portion at least partially overlapping with the light sensitive device blocks ambient light, to some extent avoiding the ambient light from irradiating the light sensitive device, so that most of the light received by the light sensitive device is signal light, effectively avoiding the influence of ambient light on signal light, and improving the optical signal-to-noise ratio.

[0074] Obviously, persons having ordinary skill in the art can make various modifications and variations to the embodiments of the present disclosure without departing from the spirit and scope of the embodiments of the present disclosure. Thus, if these modifications and variations of the embodiments of the present disclosure belong to the scope of the claims of the present disclosure and equivalent technologies thereof, the present disclosure is also intended to include these modifications and variations.

Claims

1. A display panel, wherein, The display panel comprises: a substrate; a plurality of light emitting devices on the substrate; a plurality of light sensitive devices on the substrate, the orthographic projection of the light sensitive devices on the substrate is located at the gap between the orthographic projection of adjacent light emitting devices on the substrate; a plurality of light shielding parts on the side of the layer where the light emitting devices are located away from the substrate, each of the light shielding parts is arranged corresponding to each of the light sensitive devices, the orthographic projection of the light shielding part on the substrate is located within the orthographic projection of the corresponding light sensitive device on the substrate; the shape of the orthographic projection of the light shielding part on the substrate is similar to the shape of the orthographic projection of the corresponding light sensitive device on the substrate and the shape centers coincide; the shape of the orthographic projection of the light shielding part on the substrate is rectangular, the side length of the orthographic projection of the light shielding part on the substrate is less than or equal to 1 / 2 of the side length of the orthographic projection of the corresponding light sensitive device on the substrate.

2. The display panel of claim 1, wherein, the side length of the orthographic projection of the light shielding part on the substrate is equal to 1 / 3 of the side length of the orthographic projection of the corresponding light sensitive device on the substrate.

3. The display panel of claim 2, wherein, the shape of the orthographic projection of the light sensitive device on the substrate is square, the side length of the square is greater than or equal to 10μm and less than or equal to 20μm.

4. The display panel of claim 1, wherein, each of the light sensitive devices is located between the layer where the light emitting devices are located and the substrate.

5. The display panel of claim 1, wherein, the substrate comprises a plurality of fingerprint recognition areas arranged in an array; each of the fingerprint recognition areas comprises at least two light sensitive devices, and each of the light sensitive devices in each of the fingerprint recognition areas is distributed in rotational symmetry relative to the center of the fingerprint recognition area where it is located.

6. The display panel of claim 5, wherein, in the same fingerprint recognition area, the number of light sensitive devices in each row is different, and the sum of the lengths of all the light sensitive devices is twice the sum of the widths.

7. The display panel of claim 5, wherein, in the same fingerprint recognition area, the number of light sensitive devices in each row is the same, and the shapes of the two light sensitive devices which are symmetric about the center of the fingerprint recognition unit are the same.

8. The display panel of claim 1, wherein, Further comprising: a packaging layer between the layer where the light emitting devices are located and the layer where the light shielding parts are located.

9. The display panel of claim 1, wherein, Further comprising: a touch electrode layer on the side of the layer where the light shielding parts are located away from the substrate.

10. The display panel of claim 5, wherein, The light emitting device comprises an anode, and the display panel further comprises a plurality of bias lines arranged in the same layer as the anode; each bias line is electrically connected to the light sensitive devices in a row of the fingerprint recognition areas.

11. The display panel of any one of claims 1 to 10, wherein, Further comprising: a plurality of first transistors and a plurality of second transistors between the substrate and the layer where the light sensitive devices are located; 12. A display device, wherein, each of the first transistors is electrically connected to each of the light emitting devices, and each of the second transistors is electrically connected to each of the light sensitive devices, and the same film layers of the first transistors and the second transistors are arranged in the same layer. The display panel comprises any one of claims 1-11.

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