Display substrate and display device

Abstract

The display substrate and the display device provided by the present disclosure comprise a substrate substrate; a plurality of light-sensitive devices located on one side of the substrate substrate; a first light shielding layer located on the side of the substrate substrate away from the layer where the plurality of light-sensitive devices are located, the first light shielding layer comprising a plurality of first openings, the orthogonal projection of the plurality of first openings on the substrate substrate and the orthogonal projection of the plurality of light-sensitive devices on the substrate substrate mutually overlap; a plurality of first insulating layers are stacked on the side of the first light shielding layer away from the substrate substrate, the plurality of first insulating layers comprise a plurality of second openings arranged through, the orthogonal projection of the plurality of second openings on the substrate substrate and the orthogonal projection of the plurality of first openings on the substrate substrate mutually overlap, and the orthogonal projection of the plurality of second openings on the substrate substrate and the orthogonal projection of the plurality of light-sensitive devices on the substrate substrate mutually overlap; a first planar layer is located on the side of the plurality of first insulating layers away from the substrate substrate, and the first planar layer fills the plurality of second openings.

Description

TECHNICAL FIELD

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

[0002] With the rapid development of information industry, biometric technology has been more and more widely applied. In particular, a fingerprint is a feature that is innate and unique to a human body and distinguishable from others. It is composed of a series of valleys and ridges on the surface of the skin of a fingertip, and usually includes details such as bifurcation of ridges, end of ridges, tent-shaped arch, left-handed, right-handed, spiral or double spiral. These details determine the unique characteristics of the fingerprint, and thus can be used for user identity confirmation. Based on this, the fingerprint recognition technology has been widely applied in mobile terminals, smart homes and other fields to provide security protection for user information. SUMMARY

[0003] The display substrate and display device provided by the embodiments of the present disclosure can improve the transmittance of the display product and enhance the fingerprint recognition effect.

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

[0005] a substrate substrate;

[0006] a plurality of photosensitive devices located on one side of the substrate substrate;

[0007] a first light shielding layer located on a side of the substrate substrate away from the layer where the plurality of photosensitive devices are located, the first light shielding layer comprising a plurality of first openings, a projection of the plurality of first openings on the substrate substrate and a projection of the plurality of photosensitive devices on the substrate substrate being mutually overlapped;

[0008] a plurality of first insulating layers stacked on a side of the first light shielding layer away from the substrate substrate, the plurality of first insulating layers comprising a plurality of second openings provided through, a projection of the plurality of second openings on the substrate substrate and a projection of the plurality of first openings on the substrate substrate being mutually overlapped, and a projection of the plurality of second openings on the substrate substrate and a projection of the plurality of photosensitive devices on the substrate substrate being mutually overlapped;

[0009] a first planar layer located on a side of the plurality of first insulating layers away from the substrate substrate, the first planar layer filling the plurality of second openings.

[0010] In some embodiments, in the display substrate provided by the embodiments of the present disclosure, the projection of the plurality of second openings on the substrate substrate and the projection of the plurality of first openings on the substrate substrate coincide.

[0011] In some embodiments, the above-mentioned display substrate provided in the embodiments of the present disclosure further includes a black matrix located on the side of the first flat layer away from the base substrate, the black matrix includes a plurality of third openings, and the orthographic projections of the plurality of third openings on the base substrate overlap with the orthographic projections of the plurality of first openings on the base substrate.

[0012] In some embodiments, the above-mentioned display substrate provided in the embodiments of the present disclosure further includes a second light-shielding layer located between the first flat layer and the layer where the black matrix is ​​located, and the second light-shielding layer includes a plurality of fourth openings, and the orthographic projections of the plurality of fourth openings on the base substrate are located within the orthographic projections of the plurality of third openings on the base substrate.

[0013] In some embodiments, in the display substrate provided by the embodiments of the present disclosure, the diameter a of the third opening and the diameter b of the fourth opening satisfy the following relationship:

[0014] 1≤ab≤a (1)

[0015] a=2*[(H+T)*tanθ] (2)

[0016] Wherein, H is the distance between the first light-shielding layer and the second light-shielding layer in a direction perpendicular to the base substrate, T is the distance between the second light-shielding layer and the black matrix in a direction perpendicular to the base substrate, and θ is the maximum angle between the incident light constrained by the fourth opening and the direction perpendicular to the base substrate.

[0017] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the orthographic projections of the plurality of fourth openings on the base substrate are located within the orthographic projections of the plurality of first openings on the base substrate.

[0018] In some embodiments, the above-mentioned display substrate provided in the embodiments of the present disclosure further includes a pixel defining layer located between the first flat layer and the layer where the black matrix is ​​located, and a second flat layer located between the pixel defining layer and the first flat layer. The pixel defining layer and / or the second flat layer are reused as the second light-shielding layer.

[0019] In some embodiments, the display substrate provided in the embodiments of the present disclosure further includes a pixel defining layer located between the first planar layer and the layer where the black matrix is ​​located, and a plurality of anodes located between the pixel defining layer and the first planar layer;

[0020] The second light shielding layer is located between the layer where the multiple anodes are located and the pixel definition layer, and the orthographic projection of the second light shielding layer on the base substrate does not overlap with the orthographic projection of the multiple anodes on the base substrate.

[0021] In some embodiments, the above-mentioned display substrate provided in the embodiments of the present disclosure further includes an encapsulation layer located between the first flat layer and the layer where the black matrix is ​​located, and at least one second insulating layer located between the encapsulation layer and the layer where the black matrix is ​​located, the at least one second insulating layer includes a plurality of fifth openings arranged through, and the orthographic projections of the plurality of fifth openings on the base substrate cover the orthographic projections of the plurality of third openings on the base substrate.

[0022] In some embodiments, the above-mentioned display substrate provided in the embodiment of the present disclosure further includes a plurality of coating patterns, wherein the plurality of coating patterns are located between the inner walls of the plurality of second openings and the first flat layer filled in the plurality of second openings, and the refractive index of the coating patterns is less than the refractive index of the first flat layer.

[0023] In some embodiments, the display substrate provided in the embodiments of the present disclosure further includes a pixel driving circuit located between the first light shielding layer and the first planar layer, wherein the pixel driving circuit includes a low-temperature polysilicon transistor, an oxide transistor, and a capacitor; wherein:

[0024] The layer where the first gate of the low-temperature polysilicon transistor is located is located between the first active layer of the low-temperature polysilicon transistor and the layer where the first source and drain of the low-temperature polysilicon transistor are located; the layer where the second gate of the oxide transistor is located is located between the second active layer of the oxide transistor and the layer where the second source and drain of the oxide transistor are located; the first source and drain and the second source and drain are arranged in the same layer, and the second active layer is located on a side of the layer where the first gate is located away from the substrate; the first electrode of the capacitor is arranged in the same layer as the first gate, and the second electrode of the capacitor is located between the layer where the first gate is located and the second active layer;

[0025] The multiple first insulating layers include a first buffer layer located between the first light-shielding layer and the first active layer, a first gate insulating layer located between the first active layer and the layer where the first gate is located, a second buffer layer located between the layer where the first gate is located and the layer where the second electrode is located, a third buffer layer located between the layer where the second electrode is located and the second active layer, a second gate insulating layer located between the second active layer and the layer where the second gate is located, an interlayer dielectric layer located between the layer where the second gate is located and the layer where the second source and drain are located, and a passivation layer located between the layer where the second source and drain are located and the first flat layer.

[0026] Based on the same inventive concept, an embodiment of the present disclosure provides a display device, including the above-mentioned display substrate provided by an embodiment of the present disclosure.

[0027] The beneficial effects of the present disclosure are as follows:

[0028] The display substrate and display device provided by the embodiments of the present disclosure include a base substrate; a plurality of photosensitive devices located on one side of the base substrate; a first light-shielding layer located on a side of the base substrate away from the layer where the plurality of photosensitive devices are located, the first light-shielding layer including a plurality of first openings, the orthographic projections of the plurality of first openings on the base substrate overlapping with the orthographic projections of the plurality of photosensitive devices on the base substrate; a plurality of first insulating layers stacked on a side of the first light-shielding layer away from the base substrate, the plurality of first insulating layers including a plurality of second openings arranged through, the orthographic projections of the plurality of second openings on the base substrate overlapping with the orthographic projections of the plurality of first openings on the base substrate, and the orthographic projections of the plurality of second openings on the base substrate overlapping with the orthographic projections of the plurality of photosensitive devices on the base substrate; a first flat layer located on a side of the plurality of first insulating layers away from the base substrate, the first flat layer filling the plurality of second openings. By setting multiple second openings in multiple inorganic layers and filling the first flat layer in the second openings, the light reflected from the finger incident on the second opening can directly pass through the first flat layer and then converge onto the photosensitive device through the first opening overlapping with the second opening, thereby avoiding the reflection of the light reflected from the finger on the interface of the adjacent inorganic layers, thereby improving the intensity of the light reflected from the finger received by the photosensitive device and enhancing the fingerprint recognition effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a display substrate provided in an embodiment of the present disclosure;

[0030] Figure 2 A schematic diagram of a comparative structure of a display substrate provided in an embodiment of the present disclosure;

[0031] Figure 3 A schematic diagram of another comparative structure of a display substrate provided in an embodiment of the present disclosure;

[0032] Figure 4 A schematic diagram of another structure of a display substrate provided in the disclosed embodiment;

[0033] Figure 5 A schematic diagram of another structure of a display substrate provided in the disclosed embodiment;

[0034] Figure 6 A schematic diagram of another structure of a display substrate provided in the disclosed embodiment;

[0035] Figure 7 A schematic diagram of another structure of a display substrate provided in the disclosed embodiment. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. It should be noted that the sizes and shapes of the figures in the drawings do not reflect the actual proportions, and the purpose is only to illustrate the contents of the present disclosure. And the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed descriptions of known functions and known components.

[0037] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the present disclosure belongs. The words "first", "second" and similar terms used in this disclosure and the claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Inside", "outside", "upper", "lower" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0038] In recent years, organic electroluminescent displays (OLEDs) have gradually attracted increasing attention as a new type of flat panel display product. Due to their excellent characteristics, such as active light emission, high brightness, high resolution, wide viewing angle, fast response, small thickness, low energy consumption, flexibility, wide operating temperature range, and simple structure and manufacturing process, they have broad application prospects.

[0039] In the related art, multiple photosensitive devices are arranged under the organic electroluminescent display to achieve under-screen fingerprint recognition. The principle is as follows: when a finger is placed above the organic electroluminescent display, the light emitted by the light-emitting devices contained in the organic electroluminescent display hits the valleys and ridges of the finger, and is reflected by the valleys and ridges of the finger before entering the photosensitive devices; due to the different light intensities reflected at the valleys and ridges, the photosensitive devices generate different electrical signals based on the differences in the reflected light intensities, thereby achieving fingerprint recognition. However, since the organic light-emitting display contains multiple stacked inorganic layers (such as a buffer layer, a gate insulating layer, and an interlayer dielectric layer), the reflected light from the finger is reflected at the interface of adjacent inorganic layers, reducing the intensity of the light reflected from the finger received by the photosensitive devices, affecting fingerprint recognition.

[0040] In order to improve the above technical problems existing in the related art, the present disclosure provides a display substrate, such as Figure 1 Shown, including:

[0041] The substrate 101 may be a flexible substrate, such as a polyimide (PI) substrate; or the substrate 101 may be a rigid substrate, such as a glass substrate.

[0042] A plurality of photosensitive devices 102 are located on one side of the substrate 101. Optionally, the photosensitive devices 102 may include a first electrode, a photoelectric conversion layer, and a second electrode that are stacked. The photoelectric conversion layer may have a PIN structure, which may specifically include a P-type semiconductor layer, an I-type semiconductor layer (also called an intrinsic semiconductor layer), and an N-type semiconductor layer. The P-type semiconductor layer is located between the first electrode and the I-type semiconductor layer, and the N-type semiconductor layer is located between the I-type semiconductor layer and the second electrode. Alternatively, the N-type semiconductor layer is located between the first electrode and the I-type semiconductor layer, and the P-type semiconductor layer is located between the I-type semiconductor layer and the second electrode.

[0043] A first light-shielding layer 103 is located on a side of the base substrate 101 away from the layer where the multiple photosensitive devices 102 are located. The first light-shielding layer 103 includes a plurality of first openings K1. The orthographic projections of the multiple first openings K1 on the base substrate 101 overlap with the orthographic projections of the multiple photosensitive devices 102 on the base substrate 101. Optionally, the material of the first light-shielding layer 103 is a light-shielding metal (LS).

[0044] A plurality of first insulating layers 104 are stacked on a side of the first light-shielding layer 103 away from the base substrate 101. The plurality of first insulating layers 104 include a plurality of second openings K2 provided therethrough. The orthographic projections of the plurality of second openings K2 on the base substrate 101 overlap with the orthographic projections of the plurality of first openings K1 on the base substrate 101, and the orthographic projections of the plurality of second openings K2 on the base substrate 101 overlap with the orthographic projections of the plurality of photosensitive devices 102 on the base substrate 101. Optionally, the plurality of first insulating layers 104 are all inorganic layers, or the plurality of first insulating layers 104 include organic layers and inorganic layers. The present disclosure is exemplified by assuming that the plurality of first insulating layers 104 are all inorganic layers.

[0045] The first planar layer 105 is located on a side of the plurality of first insulating layers 104 away from the base substrate 101 , and the first planar layer 105 fills the plurality of second openings K2 .

[0046] In the above-mentioned display substrate provided in the embodiment of the present disclosure, by providing multiple second openings K2 in the multiple first insulating layers 104 and filling the second openings K2 with the first flat layer 105, the light reflected from the finger incident on the second openings K2 can directly pass through the first flat layer 105 and then converge onto the photosensitive device 102 through the first opening K1 overlapping with the second openings K2, thereby reducing or even avoiding the reflection of the light reflected from the finger on the interface of the adjacent inorganic layer 102, thereby increasing the intensity of the light reflected from the finger received by the photosensitive device 102 and enhancing the fingerprint recognition effect.

[0047] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, in order to effectively enhance the intensity of the light reflected by the finger received by the photosensitive device 102, each photosensitive device 102 can be arranged to correspond to at least one first opening K1, and the orthographic projection of the first opening K1 on the base substrate 101 is located within the orthographic projection of the corresponding photosensitive device 102 on the base substrate 101.

[0048] In some embodiments, in order to prevent the light reflected by the finger from being reflected on the interface of the adjacent first insulating layer 104, the orthographic projections of the plurality of second openings K2 on the base substrate 101 can be arranged to coincide with the orthographic projections of the plurality of first openings K1 on the base substrate 101, that is, the orthographic projections of the two coincide exactly or are within the error range caused by factors such as manufacturing and measurement. It should be understood that the first opening K1 can be an opening with a uniform diameter in the thickness direction of the first light-shielding layer 103, or the first opening K1 can also be an opening with a gradually increasing diameter in the direction from the first light-shielding layer 103 to the base substrate 101 (e.g., Figure 1 shown). Figure 1 In the illustrated case, the first opening K1 actually constrains the angle of incident light at its smallest bottom port on the side closest to the base substrate 101. The orthographic projection of the second opening K2 on the base substrate 101 coincides with the orthographic projection of the first opening K1 on the base substrate 101. This can be understood as the orthographic projection of the second opening K2 on the base substrate 101 coincides with the orthographic projection of the bottom port of the first opening K1 on the base substrate 101. In some embodiments, the second openings K2 are provided in a one-to-one correspondence with the first openings K1.

[0049] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, as Figure 1As shown, a black matrix 106 may also be included on the side of the first flat layer 105 away from the base substrate 101. The black matrix 106 includes a plurality of third openings K3. The orthographic projections of the plurality of third openings K3 on the base substrate 101 overlap with the orthographic projections of the plurality of first openings K1 on the base substrate 101. The third openings K3 and the first openings K1 can collimate the reflected light of the fingerprint together, thereby avoiding interference from large-angle stray light and improving the fingerprint recognition effect. Optionally, the black matrix 106 may also include a plurality of first pixel openings K. Red light color resist R, green light color resist G, and blue light color resist B may be set in the first pixel openings K. A color filter (CF) composed of the black matrix 106, red light color resist R, green light color resist G, and blue light color resist B can replace a polarizer to reduce reflected light, enhance display contrast, and save power consumption.

[0050] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, as Figure 1 As shown, a second light-shielding layer 107 may be further included between the first flat layer 105 and the layer where the black matrix 106 is located. The second light-shielding layer 107 includes a plurality of fourth openings K4. The orthographic projections of the plurality of fourth openings K4 on the base substrate 101 are located within the orthographic projections of the plurality of third openings K3 on the base substrate 101, which is equivalent to the first opening K1, the third opening K3 and the fourth opening K4 being used together as a collimating hole combination, and the fourth opening K4 being the main control hole for transmittance, constraining the incident angle of the incident light. In addition, when the third opening K3 is larger than the fourth opening K4, more finger reflected light can be provided through the fourth opening K4 to be incident on the third opening K3, thereby greatly improving the incident light angle.

[0051] In some embodiments, Figure 2 The third opening K3 is equal to the fourth opening K4, and Figure 3 The third opening K3 is smaller than the fourth opening K4 in the two solutions shown in FIG. Figure 2 In the solution where the third opening K3 and the fourth opening K4 are equal in size, the third opening K3 serves as the main control hole for the incident light, so that the angle of the lateral incident light is worse than that of the present solution. Alternatively, in the solution disclosed herein where the fourth opening K4 is 2 μm wider than the third opening K3, the angle of the lateral incident light is 35°. Figure 2 The angle of the lateral incident light of the fourth opening K4 and the third opening K3 is 21°; Figure 3 In the solution where the third opening K3 is smaller than the fourth opening K4, not only is the angle of the side incident light worse than that of this solution, but the fourth opening K4 cannot form an effective light path due to the enlarged aperture compared to the third opening K3, resulting in a large waste of space.

[0052] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, as Figure 1 As shown, the diameter a of the third opening and the diameter b of the fourth opening K4 can satisfy the following relationship:

[0053] 1≤ab≤a (1)

[0054] a=2*[(H+T)*tanθ] (2)

[0055] Wherein, H is the distance between the first light-shielding layer 103 and the second light-shielding layer 107 in the direction Z perpendicular to the base substrate 101, T is the distance between the second light-shielding layer 107 and the black matrix 106 in the direction Z perpendicular to the base substrate 101, and θ is the maximum angle between the incident light constrained by the fourth opening K4 and the direction Z perpendicular to the base substrate 101.

[0056] In some embodiments, in the display substrate provided in the embodiments of the present disclosure, the orthographic projections of the plurality of fourth openings K4 of the second light-shielding layer 107 on the base substrate 101 may be located within the orthographic projections of the plurality of first openings K1 of the first light-shielding layer 103 on the base substrate 101, so as to avoid the presence of the light-shielding metal pattern of the first light-shielding layer 103 in the region of the fourth openings K4, thereby reducing reflectivity. Optionally, the first openings K1 of the first light-shielding layer 103, the third openings K3 of the black matrix 106, and the fourth openings of the second light-shielding layer 107 may be provided in a one-to-one correspondence, and the fourth openings K4 may be smaller than the corresponding first openings K1 and third openings K3, and the size relationship between the first openings K1 and third openings K3 is not limited. Of course, in some embodiments, if the second light-shielding layer 107 does not exist, the first openings K1 may be limited to be larger than the third openings K3, so as to avoid the presence of the light-shielding metal pattern of the first light-shielding layer 103 in the region of the third openings K3, thereby reducing reflectivity.

[0057] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, as Figure 1 and Figure 4As shown, the display substrate can further include a pixel definition layer 108 located between the first planar layer 105 and the layer where the black matrix 106 is located, and a second planar layer 109 located between the pixel definition layer 108 and the first planar layer 105, the pixel definition layer 108 and / or the second planar layer 109 are multiplexed as the second light shielding layer 107, the pixel definition layer 108 and / or the second planar layer 109 multiplexed as the second light shielding layer 107 have a low transmittance, and in some embodiments, the pixel definition layer 108 and / or the second planar layer 109 multiplexed as the second light shielding layer 107 can be black. By multiplexing the pixel definition layer 108 and / or the second planar layer 109 as the second light shielding layer 107, the second light shielding layer 107 does not need to be additionally provided, the number of film layers can be reduced, and the design of lightness and thinness is facilitated; at the same time, the pixel definition layer 108 or the second planar layer 109 can also effectively shield other metal layers such as the first light shielding layer 103 below, and reduce the reflectivity.

[0058] In some embodiments, as shown in Figure 1 and Figure 4 The pixel definition layer 108 includes a plurality of second pixel openings K', and the red light emitting device, the green light emitting device, and the blue light emitting device can be arranged in the second pixel openings K'. Optionally, the red light emitting device, the green light emitting device, and the blue light emitting device each include an anode 110, a light emitting functional layer (not shown in the figure), and a cathode (not shown in the figure) arranged in layers, and the light emitting functional layer includes but is not limited to a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting material layer, a hole blocking layer, an electron transport layer, and an electron injection layer.

[0059] In some embodiments, in the display substrate provided in the embodiments of the present disclosure, as shown in Figure 5 The anode 110 can be located between the pixel definition layer 108 and the second planar layer 109; optionally, the second light shielding layer 107 is located between the layer where the anode 110 is located and the pixel definition layer 108, and the orthographic projection of the second light shielding layer 107 on the substrate 101 and the orthographic projection of the anode 110 on the substrate 101 do not overlap each other. In some embodiments, the second light shielding layer 107 between two adjacent anodes 110 can be a circular pattern with a hollow center (equivalent to a third opening K3), and the solid width of the circular pattern can be 2 μm.

[0060] In some embodiments, in the display substrate provided in the embodiments of the present disclosure, as shown in Figure 6As shown, it may also include an encapsulation layer 111 located between the first flat layer 105 and the layer where the black matrix 106 is located, and at least one second insulating layer 112 located between the encapsulation layer 111 and the layer where the black matrix 106 is located, and all the second insulating layers 112 include a plurality of fifth openings K5 arranged therethrough, and the orthographic projections of the plurality of fifth openings K5 on the base substrate 101 cover the orthographic projections of the plurality of third openings K3 of the black matrix 106 on the base substrate 101, which is equivalent to the orthographic projections of the plurality of fifth openings K5 on the base substrate 101 being greater than or equal to the orthographic projections of the plurality of third openings K3 on the base substrate 101. In other words, the aperture of the fifth opening K5 is greater than or equal to the aperture of the third opening K3, thereby ensuring that the transmitted light of the third opening K3 is not consumed at the second insulating layer 112.

[0061] In some embodiments, at least one second insulating layer 112 may be an inorganic layer, or, when there are multiple second insulating layers 112, they may include both organic layers and inorganic layers. This disclosure uses the example of at least one second insulating layer 112 being an inorganic layer as an example. Figure 6 As shown, at least one second insulating layer 112 may include a first sub-inorganic layer 1121 and a second sub-inorganic layer 1122. Optionally, a bridging layer (TMA) may be provided between the first sub-inorganic layer 1121 and the second sub-inorganic layer 1122, and a touch layer (TMB) may be provided between the second sub-inorganic layer 1122 and the layer where the black matrix 106 is located. The touch layer includes a metal grid arranged in a horizontal and vertical cross pattern, and the horizontal metal grid or the vertical metal grid is electrically connected to the bridging layer.

[0062] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, as Figure 7 As shown, the device may further include multiple coating patterns 113 located between the inner walls of the multiple second openings K2 and the first flat layer 105 filling the multiple second openings K2. The refractive index of the coating patterns 113 is lower than that of the first flat layer 105. This allows lateral stray light incident into the second openings K2 to be totally reflected at the interface between the coating patterns 113 and the first flat layer 105 and then converged onto the photosensitive device 102 for reuse, further increasing the light intensity received by the photosensitive device 102 and improving the fingerprint recognition effect. Optionally, the difference between the refractive index of the first flat layer 105 and the refractive index of the coating patterns 113 is greater than or equal to 0.1.

[0063] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, as Figure 1 、 Figures 4 to 7As shown, it can also include a pixel driving circuit 114 located between the first light-shielding layer 103 and the first flat layer 105. The pixel driving circuit 114 includes a low-temperature polysilicon transistor T1, an oxide transistor T2 and a capacitor C, so that the pixel driving circuit 114 can simultaneously take advantage of the strong driving force of the low-temperature polysilicon transistor T1 and the low power consumption of the oxide transistor T2.

[0064] Optionally, the layer where the first gate G1 of the low-temperature polysilicon transistor T1 is located is located between the first active layer A1 of the low-temperature polysilicon transistor T1 and the layer where the first source and drain SD1 of the low-temperature polysilicon transistor T1 is located; the layer where the second gate G1 of the oxide transistor T2 is located is located between the second active layer A2 of the oxide transistor T2 and the layer where the second source and drain SD2 of the oxide transistor T2 are located; the first source and drain SD1 and the second source and drain SD2 are arranged in the same layer, and the second active layer A2 is located on the side of the layer where the first gate G1 is located away from the base substrate 101; the first electrode C1 of the capacitor C is arranged in the same layer as the first gate G1, and the second electrode C2 of the capacitor C is located between the layer where the first gate G1 is located and the second active layer A2; multiple first The insulating layer 104 includes a first buffer layer 1041 located between the first light-shielding layer 103 and the first active layer A1, a first gate insulating layer 1042 located between the first active layer A1 and the layer where the first gate electrode G1 is located, a second buffer layer 1043 located between the layer where the first gate electrode G1 is located and the layer where the second electrode C2 is located, a third buffer layer 1044 located between the layer where the second electrode C2 is located and the second active layer A2, a second gate insulating layer 1045 located between the second active layer A2 and the layer where the second gate electrode G2 is located, an interlayer dielectric layer 1046 located between the layer where the second gate electrode G2 is located and the layer where the second source and drain electrode SD2 is located, and a passivation layer 1047 located between the layer where the second source and drain electrode SD2 is located and the first flat layer 105.

[0065] It can be seen that the number of the plurality of first insulating layers 104 can be as high as 7. Since the transmittance of a single inorganic layer is about 92%, the total transmittance of the seven first insulating layers 104 after overlapping is 0.92. 7 , i.e., 55.6%. In the present disclosure, by providing a second opening K2 throughout the entire thickness of the first insulating layer 104 and filling the second opening K2 with the first flat layer 105, the equivalent transmittance at the second opening K2 can be equal to the transmittance of the first flat layer 105. In the related art, the transmittance of the first flat layer 105 is greater than or equal to 80%. Therefore, the equivalent transmittance at the second opening K2 is greater than or equal to 80%, an improvement of 24.4%, which is conducive to improving the fingerprint recognition effect.

[0066] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, as Figure 1 、 Figures 4 to 7As shown, it may also include a support structure 115, an etching stopper layer 116, and a transfer electrode 117. Other essential components of the display substrate are well understood by those skilled in the art and are not described here in detail and should not be construed as limiting the present disclosure.

[0067] Based on the same inventive concept, an embodiment of the present disclosure provides a display device, including the above-mentioned display substrate provided by the embodiment of the present disclosure. Since the principle of solving the problem by the display device is similar to the principle of solving the problem by the above-mentioned display substrate, the implementation of the display device provided by the embodiment of the present disclosure can refer to the implementation of the above-mentioned display substrate provided by the embodiment of the present disclosure, and the repeated parts will not be repeated.

[0068] In some embodiments, the above-mentioned display device provided by the embodiments of the present disclosure may be: a projector, a 3D printer, a virtual reality device, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, a smart watch, a fitness wristband, a personal digital assistant, or any other product or component with a display function. The display device includes but is not limited to components such as a radio frequency unit, a network module, an audio output & input unit, a sensor, a display unit, a user input unit, an interface unit, and a control chip. Optionally, the control chip is a central processing unit, a digital signal processor, a system-on-chip (SoC), etc. For example, the control chip may also include a memory, a power module, etc., and realize power supply and signal input and output functions through additionally provided wires, signal lines, etc. For example, the control chip may also include hardware circuits and computer executable codes, etc. The hardware circuit may include conventional very large scale integration (VLSI) circuits or gate arrays and existing semiconductors or other discrete components such as logic chips and transistors; the hardware circuit may also include field programmable gate arrays, programmable array logic, programmable logic devices, etc. In addition, those skilled in the art will understand that the above structure does not constitute a limitation on the above display device provided in the embodiment of the present disclosure. In other words, the above display device provided in the embodiment of the present disclosure may include more or fewer of the above components, or a combination of certain components, or different component arrangements.

[0069] Although the present disclosure has described preferred embodiments, it should be understood that those skilled in the art may make various changes and modifications to the embodiments without departing from the spirit and scope of the embodiments of the present disclosure. Thus, if such modifications and variations of the embodiments of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include such modifications and variations.

Claims

1. A display substrate, characterized in that: include: substrate; A plurality of photosensitive devices are located on one side of the substrate, the photosensitive devices comprising a first electrode, a photoelectric conversion layer, and a second electrode arranged in a stacked manner, wherein the photoelectric conversion layer has a PIN structure, and the PIN structure comprises a P-type semiconductor layer, an I-type semiconductor layer, and an N-type semiconductor layer; wherein the P-type semiconductor layer is located between the first electrode and the I-type semiconductor layer, and the N-type semiconductor layer is located between the I-type semiconductor layer and the second electrode; or, the N-type semiconductor layer is located between the first electrode and the I-type semiconductor layer, and the P-type semiconductor layer is located between the I-type semiconductor layer and the second electrode; a first light-shielding layer located on a side of the base substrate away from the layer where the plurality of photosensitive devices are located, the first light-shielding layer comprising a plurality of first openings, wherein orthographic projections of the plurality of first openings on the base substrate overlap with orthographic projections of the plurality of photosensitive devices on the base substrate; a plurality of first insulating layers stacked on a side of the first light-shielding layer away from the base substrate, the plurality of first insulating layers including a plurality of second openings extending therethrough, the orthographic projections of the plurality of second openings on the base substrate overlapping with the orthographic projections of the plurality of first openings on the base substrate, and the orthographic projections of the plurality of second openings on the base substrate overlapping with the orthographic projections of the plurality of photosensitive devices on the base substrate; A first planar layer is located on a side of the plurality of first insulating layers away from the base substrate, and the first planar layer fills the plurality of second openings; The invention also includes a black matrix located on a side of the first planar layer away from the base substrate, the black matrix including a plurality of third openings, wherein the orthographic projections of the plurality of third openings on the base substrate overlap with the orthographic projections of the plurality of first openings on the base substrate; The invention also includes a second light-shielding layer located between the first planar layer and the layer where the black matrix is ​​located, wherein the second light-shielding layer includes a plurality of fourth openings, and the orthographic projections of the plurality of fourth openings on the base substrate are located within the orthographic projections of the plurality of third openings on the base substrate; The diameter a of the third opening and the diameter b of the fourth opening satisfy the following relationship: 1≤ab≤a (1) a=2*[(H+T)*tanθ] (2) Wherein, H is the distance between the first light-shielding layer and the second light-shielding layer in a direction perpendicular to the base substrate, T is the distance between the second light-shielding layer and the black matrix in a direction perpendicular to the base substrate, and θ is the maximum angle between the incident light constrained by the fourth opening and the direction perpendicular to the base substrate.

2. The display substrate according to claim 1, wherein The orthographic projections of the plurality of second openings on the base substrate coincide with the orthographic projections of the plurality of first openings on the base substrate.

3. The display substrate according to claim 1, wherein The orthographic projections of the plurality of fourth openings on the base substrate are located within the orthographic projections of the plurality of first openings on the base substrate.

4. The display substrate according to claim 1, wherein It also includes a pixel defining layer located between the first flat layer and the layer where the black matrix is ​​located, and a second flat layer located between the pixel defining layer and the first flat layer. The pixel defining layer and / or the second flat layer are reused as the second light-shielding layer.

5. The display substrate according to claim 1, wherein It also includes a pixel defining layer located between the first planar layer and the layer where the black matrix is ​​located, and a plurality of anodes located between the pixel defining layer and the first planar layer; The second light shielding layer is located between the layer where the multiple anodes are located and the pixel definition layer, and the orthographic projection of the second light shielding layer on the base substrate does not overlap with the orthographic projection of the multiple anodes on the base substrate.

6. The display substrate according to claim 1, wherein It also includes an encapsulation layer located between the first flat layer and the layer where the black matrix is ​​located, and at least one second insulating layer located between the encapsulation layer and the layer where the black matrix is ​​located, the at least one second insulating layer includes a plurality of fifth openings arranged therethrough, and the orthographic projections of the plurality of fifth openings on the base substrate cover the orthographic projections of the plurality of third openings on the base substrate.

7. The display substrate according to any one of claims 1 to 6, wherein: The system further includes a plurality of plating patterns located between inner walls of the plurality of second openings and the first flat layer filled in the plurality of second openings, wherein a refractive index of the plating patterns is lower than a refractive index of the first flat layer.

8. The display substrate according to any one of claims 1 to 6, wherein: It also includes a pixel driving circuit located between the first light shielding layer and the first planar layer, the pixel driving circuit including a low-temperature polysilicon transistor, an oxide transistor and a capacitor; wherein, The layer where the first gate of the low-temperature polysilicon transistor is located is located between the first active layer of the low-temperature polysilicon transistor and the layer where the first source and drain of the low-temperature polysilicon transistor are located; the layer where the second gate of the oxide transistor is located is located between the second active layer of the oxide transistor and the layer where the second source and drain of the oxide transistor are located; the first source and drain and the second source and drain are arranged in the same layer, and the second active layer is located on a side of the layer where the first gate is located away from the substrate; the first electrode of the capacitor is arranged in the same layer as the first gate, and the second electrode of the capacitor is located between the layer where the first gate is located and the second active layer; The multiple first insulating layers include a first buffer layer located between the first light-shielding layer and the first active layer, a first gate insulating layer located between the first active layer and the layer where the first gate is located, a second buffer layer located between the layer where the first gate is located and the layer where the second electrode is located, a third buffer layer located between the layer where the second electrode is located and the second active layer, a second gate insulating layer located between the second active layer and the layer where the second gate is located, an interlayer dielectric layer located between the layer where the second gate is located and the layer where the second source and drain are located, and a passivation layer located between the layer where the second source and drain are located and the first flat layer.

9. A display device, characterized in that: The display substrate comprises the display substrate according to any one of claims 1 to 8.

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