Display panel and display device

Abstract

Embodiments of the present application provide a display panel and a display device, comprising a plurality of light sensing devices and a plurality of light detection circuits; the light detection circuit comprises a sensing module, a reading module and a reset module; the control end of the sensing module is electrically connected with the light sensing device and the reset module; the input end of the sensing module is electrically connected with a first signal line, and the output end is electrically connected with the reading module; the control end of the sensing module in the first light detection circuit is electrically connected with a first light sensing device; the control end of the sensing module in the second light detection circuit is electrically connected with a second light sensing device; the second light detection circuit further comprises a first capacitor, and the control end of the sensing module in the second light detection circuit is electrically connected with the first capacitor; the detection accuracy of the second light sensing device and the second light detection circuit for a light signal can be improved.

Description

[Technical Field]

[0001] This application relates to the field of display technology, and in particular to a display panel and display device. [Background Technology]

[0002] Embedded fingerprint sensor display panels distribute fingerprint sensors relatively evenly across the display area to increase the number of fingerprint recognition points. However, with numerous fingerprint sensors in the display area, the placement of the ambient light sensor is limited, resulting in less ambient light being received. When the ambient light received by the sensor is insufficient, the light emitted from the display panel has a greater impact on it, causing the sensor to fail to accurately detect changes in ambient light. Therefore, embedded fingerprint sensor display panels suffer from inaccurate ambient light detection.

[0003] [Application Content]

[0004] In view of this, embodiments of this application provide a display panel and a display device.

[0005] In a first aspect, embodiments of this application provide a display panel including multiple photosensitive devices and multiple light detection circuits; each light detection circuit includes a sensing module, a reading module, and a reset module; the control terminal of the sensing module is electrically connected to the photosensitive device and the reset module; the input terminal of the sensing module is electrically connected to a first signal line, and the output terminal is electrically connected to the reading module; wherein, the multiple photosensitive devices include a first photosensitive device and a second photosensitive device, and the multiple light detection circuits include a first light detection circuit and a second light detection circuit; the first photosensitive device is electrically connected to the control terminal of the sensing module in the first light detection circuit, and the second photosensitive device is electrically connected to the control terminal of the sensing module in the second light detection circuit; the second light detection circuit further includes a first capacitor, which is electrically connected to the control terminal of the sensing module in the second light detection circuit.

[0006] Secondly, embodiments of this application also provide a display device, including the display panel as provided in the first aspect.

[0007] By adding a first capacitor to the control terminal of the sensing module in the second light detection circuit, the load capacitance of the control terminal of the sensing module is increased. Therefore, the second type of light detection unit can start working when the light signal it receives and detects is large, reducing the influence of the display light emitted by the display panel on the light signal to be detected by the second type of light detection unit, and improving the detection accuracy of the light signal by the second type of light detection unit. [Attached Image Description]

[0008] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a plan view of a display panel provided in an embodiment of this application;

[0010] Figure 2 for Figure 1 A schematic diagram of a module of the first type of light detection unit in the display panel shown;

[0011] Figure 3 This is a schematic diagram of a module of the second type of light detection unit in a display panel;

[0012] Figure 4 for Figure 1 A schematic cross-sectional view along the L1-L2 direction;

[0013] Figure 5 for Figure 1 A schematic diagram of another module of the second type of light detection unit in the display panel shown;

[0014] Figure 6 for Figure 1 Another cross-sectional view along the L1-L2 direction;

[0015] Figure 7 for Figure 1 A schematic cross-sectional view along the N1-N2 direction;

[0016] Figure 8 for Figure 1 The diagram shows an equivalent circuit diagram of a first type of light detection unit in the display panel.

[0017] Figure 9 for Figure 1 An equivalent circuit diagram of the second type of light detection unit in the display panel shown;

[0018] Figure 10 A timing diagram of the operation of a light detection circuit in a display panel provided in an embodiment of this application;

[0019] Figure 11 A schematic diagram of a display panel provided in an embodiment of this application;

[0020] Figure 12 for Figure 11 The equivalent circuit diagram of the first type of light detection unit and the second type of light detection unit in area A2 of the display panel is shown.

[0021] Figure 13 A schematic diagram of a display panel provided in an embodiment of this application;

[0022] Figure 14 A schematic diagram of a display panel provided in an embodiment of this application;

[0023] Figure 15 for Figure 13 and Figure 14 The equivalent circuit diagram of the first type of light detection unit and the second type of light detection unit in area A3 of the display panel is shown.

[0024] Figure 16 for Figure 15 The timing diagrams of the optical detection circuits in the first type of optical detection unit and the second type of optical detection unit are shown below.

[0025] Figure 17 for Figure 1 A schematic cross-sectional view along the L1-L2 direction;

[0026] Figure 18 for Figure 1 A schematic cross-sectional view along the L1-L2 direction;

[0027] Figure 19 for Figure 18 A schematic diagram showing the projection of the light-shielding layer and the light-sensing device;

[0028] Figure 20 for Figure 1 A schematic cross-sectional view along the L1-L2 direction;

[0029] Figure 21 for Figure 1 A schematic cross-sectional view along the L1-L2 direction;

[0030] Figure 22 for Figure 1 A schematic cross-sectional view along the L1-L2 direction;

[0031] Figure 23 for Figure 1 A schematic cross-sectional view along the L1-L2 direction;

[0032] Figure 24 for Figure 1 A schematic cross-sectional view along the N1-N2 direction;

[0033] Figure 25 for Figure 24 A schematic diagram of the projection of the middle section structure;

[0034] Figure 26 for Figure 1 A schematic cross-sectional view along the N1-N2 direction;

[0035] Figure 27 for Figure 1 A schematic cross-sectional view along the N1-N2 direction;

[0036] Figure 28 for Figure 27 A schematic diagram of the intermediate light-shielding layer;

[0037] Figure 29 for Figure 1 A schematic cross-sectional view along the N1-N2 direction;

[0038] Figure 30 This is a schematic diagram of a display device provided in an embodiment of this application.

Detailed Implementation Methods

[0039] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0040] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0041] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0042] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0043] In the description of this specification, it should be understood that the terms "substantially", "approximately", "about", "about", "generally", "largely" used in the claims and embodiments of this application refer to values ​​that can be generally agreed upon within a reasonable range of process operations or tolerances, rather than a precise value.

[0044] It should be understood that although terms such as first, second, third, etc., may be used to describe sub-scan lines in the embodiments of this application, these sub-scan lines should not be limited to these terms. These terms are only used to distinguish sub-scan lines from one another. For example, without departing from the scope of the embodiments of this application, a first sub-scan line may also be referred to as a second sub-scan line, and similarly, a second sub-scan line may also be referred to as a first sub-scan line.

[0045] Through meticulous and in-depth research, the applicant in this case has provided a solution to the problems existing in the prior art.

[0046] Figure 1 This is a plan view of a display panel provided in an embodiment of this application.

[0047] like Figure 1 As shown, the display panel 001 provided in this embodiment includes a plurality of first-type light detection units 01 and a plurality of second-type light detection units 02. The first-type light detection units 01 and the second-type light detection units 02 are used to detect different types of light signals, respectively. For example, the first-type light detection units 01 are used to detect light signals in the process of biometric recognition, such as light signals in the process of fingerprint recognition, light signals in the process of palm recognition, etc.; the second-type light detection units 02 are used to detect light signals in the process of ambient light detection.

[0048] In addition, the display panel 001 also includes a substrate ST, and the first type of light detection unit 01 and the second type of light detection unit 02 can be disposed on the same side of the substrate ST.

[0049] Figure 2 for Figure 1 The diagram shown is a schematic of one type of light detection unit in the display panel. Figure 3 This is a schematic diagram of a module of the second type of light detection unit in a display panel.

[0050] Combination Figure 2 and Figure 3 Both the first type of light detection unit 01 and the second type of light detection unit 02 include a light sensor 10' and a light detection circuit 10, that is, the display panel 001 includes multiple light sensors 10' and light detection circuits 10.

[0051] Please continue to refer to this. Figure 2 and Figure 3The light detection circuits 10 included in the first type of light detection unit 01 and the second type of light detection unit 02 each include a sensing module 12 / 22, a reading module 11 / 21, and a reset module 13 / 23. The control terminal CTR of the sensing module 12 / 22 is electrically connected to the photosensitive device 10' and the reset module 13 / 23; the input terminal IN of the sensing module 12 / 22 is electrically connected to the first signal line L1, and the output terminal OUT of the sensing module 12 / 22 is electrically connected to the reading module 11 / 21. That is, among the multiple light detection circuits 10 included in the display panel 001, regardless of whether the light detection circuit 10 belongs to the first type of light detection unit 01 or the second type of light detection unit 02, these light detection circuits 10 all include a sensing module 12 / 22, a reading module 11 / 21, and a reset module 13 / 23, but the electrical connection methods of the sensing module 12 / 22, the reading module 11 / 21, and the reset module 13 / 23 in these light detection circuits 10 are different.

[0052] It should be noted that, for clarity, the sensing module included in the light detection circuit 10 of the first type of light detection unit 01 is labeled as sensing module 12, the reading module is labeled as reading module 11, and the reset module is labeled as reset module 13; the sensing module included in the light detection circuit 10 of the second type of light detection unit 02 is labeled as sensing module 22, the reading module is labeled as reading module 21, and the reset module is labeled as reset module 23.

[0053] Among them, the photosensitive device 10' is used to integrate the light signal illuminating it and convert the light signal into an electrical signal; the reset module 13 / 23 is used to reset the control terminal CTR of the sensing module 12 / 22; the sensing module 12 / 22 is used to receive the electrical signal output by the photosensitive device 10' and convert and amplify the received electrical signal; and the reading module 11 / 21 is used to control the output of the signal converted and amplified by the sensing module 12 / 22 for reading.

[0054] The plurality of photosensitive devices 10' include a first photosensitive device 10'a and a second photosensitive device 10'b, and the plurality of light detection circuits 10 include a first light detection circuit 10a and a second light detection circuit 10b. The first photosensitive device 10'a is electrically connected to the control terminal CTR of the sensing module 12 in the first light detection circuit 10a, and the second photosensitive device 10'b is electrically connected to the control terminal CTR of the sensing module 22 in the second light detection circuit 10b. It can be understood that the first type of light detection unit 01 includes the electrically connected first photosensitive device 10'a and first light detection circuit 10a, and the second type of light detection unit 02 includes the electrically connected second photosensitive device 10'b and second light detection circuit 10b.

[0055] Since both the first type of optical detection unit 01 and the second type of optical detection unit 02 are used for collecting and detecting optical signals, the optical detection circuit 10a in the first type of optical detection unit 01 and the optical detection circuit 10b in the second type of optical detection unit 02 can adopt the same structure, which can reduce the design and driving difficulty. However, different types of optical detection units require different detection accuracies. Taking the first type of optical detection unit 01 used to detect the optical signal in the fingerprint recognition process and the second type of optical detection unit 02 used to detect the optical signal in the ambient light detection process as an example, this will be explained. Since fingerprint recognition requires high detection accuracy, the capacitance value of the storage capacitor included in the optical detection circuit 10 in the first type of optical detection unit 01 should be small. The storage capacitor is the capacitor electrically connected to the control terminal of the sensing module 12 in the optical detection circuit 10, and is usually the capacitance between the anode and cathode of the photosensitive device 10' (not shown in the figure). However, when the storage capacitors in the light detection circuits 10 included in the second type light detection unit 02 and the first type light detection unit 01 are the same and have small values, the display light emitted by the display panel 001, superimposed with a small intensity of ambient light, may cause the second type light detection unit 02 to work. At this time, the second type light detection unit 02 cannot accurately detect changes in ambient light.

[0056] In this embodiment, the second light detection circuit 10b further includes a first capacitor C1, which is electrically connected to the control terminal CTR of the sensing module 22 in the second light detection circuit 10b. That is, compared with the first light detection circuit 10a in the first type light detection unit 01, the second light detection circuit 10b in the second type light detection unit 02 adds a first capacitor C1 electrically connected to the control terminal CTR of the sensing module 22.

[0057] By adding a first capacitor C1 to the control terminal CTR of the sensing module 22 in the second light detection circuit 10b, the load capacitance of the control terminal CTR of the sensing module 22 is increased. Therefore, the second type of light detection unit 02 can start working when the light signal it receives and detects is large, reducing the influence of the display light emitted by the display panel 001 on the light signal to be detected by the second type of light detection unit 02, and improving the detection accuracy of the light signal by the second type of light detection unit 02.

[0058] In one embodiment, the capacitive load of the control terminal of the sensing module 12 in the first light detection circuit 10a is less than the capacitive load of the control terminal of the sensing module 22 in the second light detection circuit 10b. Regardless of whether the control terminal of the sensing module 12 in the first light detection circuit 10a is electrically connected to a capacitor, it still has a capacitive load due to the presence of parasitic capacitance. The capacitive load of the control terminal of the sensing module 12 in the second light detection circuit 10b includes not only parasitic capacitance but also the first capacitor C1.

[0059] In one technical solution, the first light detection circuit 10a does not include a capacitor compared to the second light detection circuit 10b. That is, compared to the second light detection circuit 10b, the first light detection circuit 10a does not contain a capacitor with the same electrical connection as the first capacitor C1. The second light detection circuit 10b, compared to the first light detection circuit 10a, mainly adds the first capacitor C1. The other modules in the second light detection circuit 10b are basically the same as those in the first light detection circuit 10a. Therefore, it does not excessively increase the design and driving difficulty of the light detection circuit 10 in the display panel 001.

[0060] In the display panel 001 provided in the embodiments of this application, as Figure 1 As shown, the first type of light detection units 01 can be relatively evenly distributed in the display area AA of the display panel 001, and the number of the second type of light detection units 02 can be less than the number of the first type of light detection units 01. The second type of light detection units 02 can also be located in the display area AA of the display panel 001 within 3.5mm of the edge of the display area AA; that is, the second type of light detection units 02 are mainly located in the display area AA of the display panel 001 near the non-display area NA.

[0061] Correspondingly, the second light detection circuit 10b can also be disposed in the display area AA of the display panel 001 and within 3.5mm of the edge of the display area AA. That is, the second light detection circuit 10b is mainly disposed in the display area AA of the display panel 001 near the non-display area NA. The second light sensing device 10a can also be disposed in the display area AA of the display panel 001 and within 3.5mm of the edge of the display area AA. That is, the second light sensing device 10a is mainly disposed in the display area AA of the display panel 001 near the non-display area NA.

[0062] like Figure 1As shown, the second type of light detection unit 02 can be disposed in the four corner areas of the display area AA of the display panel 001. In addition, the second type of light detection unit 02 can also be disposed in the area near the left and right edges of the display area AA of the display panel 001, and / or, the second type of light detection unit 02 can also be disposed in the area near the top and bottom edges of the display area AA of the display panel 001.

[0063] Figure 4 for Figure 1 A schematic cross-sectional view along the L1-L2 direction.

[0064] In one embodiment of this application, combined with Figure 4 and Figure 2 , Figure 3 Both the first photosensitive device 10'a and the second photosensitive device 10'b are photodiodes. The first terminal of the photodiode is electrically connected to the second signal line L2, and the second terminal of the photodiode is electrically connected to the control terminal CTR of the sensing module 12 / 22. Specifically, in conjunction with Figure 2 and Figure 3 The first electrode of the photodiode is the anode and the second electrode of the photodiode is the cathode. The anode of the photodiode is electrically connected to the second signal line L2 and the cathode of the photodiode is electrically connected to the control terminal CTR of the sensing module 12 / 22.

[0065] In one embodiment of this application, when the first plate E1 of the first capacitor C1 is electrically connected to the control terminal CTR of the sensing module 22 in the second light detection circuit 10b, and the second electrode of the photodiode is also electrically connected to the control terminal CTR of the sensing module 22, the first plate E1 of the first capacitor C1 can be disposed on the same layer as the second electrode of the photodiode, and the first plate E1 of the first capacitor C1 is electrically connected to the second electrode of the photodiode in the second type of light detection unit 02. It can be understood that the portion of the second electrode (cathode) of the photodiode in the second type of light detection unit 02 extending outwards and extending beyond the area where the second photosensitive device 10'b is located forms the first plate E1 of the first capacitor C1.

[0066] In one embodiment of this application, the first plate E1 of the first capacitor C1 is electrically connected to the control terminal CTR of the sensing module 22 in the second optical detection circuit 10b, and the second plate E2 of the first capacitor C1 is electrically connected to the first signal line L1, that is, the potential signal of the second plate E2 of the first capacitor C1 is the potential signal transmitted by the first signal line L1.

[0067] In one technical solution corresponding to this embodiment, the second plate E2 of the first capacitor C1 can be disposed on the same layer as the first signal line L1, and the second plate E2 of the first capacitor C1 can be designed to be widened to extend the first signal line L1 to the area where the first plate E1 of the first capacitor C1 is located, and the widened part can be used as the second plate E2 of the first capacitor C1.

[0068] Figure 5 for Figure 1 This is a schematic diagram of another module of the second type of light detection unit in the display panel shown. Figure 6 for Figure 1 Another cross-sectional view along the M1-M2 direction.

[0069] In one embodiment of this application, combined with Figure 6 and Figure 2 , Figure 5 The first plate E1 of the first capacitor C1 is electrically connected to the control terminal CTR of the sensing module 22 in the second optical detection circuit 10b, and the second plate E2 of the first capacitor C1 is electrically connected to the second signal line L2.

[0070] In one technical solution corresponding to this embodiment, the second plate E2 of the first capacitor C1 can be disposed on the same layer as the second signal line L2, and the second plate E2 of the first capacitor C1 can be designed to widen the area where the second signal line L2 is located towards the first plate E1 of the first capacitor C1, and the widened part can be used as the second plate E2 of the first capacitor C1.

[0071] Regardless of whether the second plate of the first capacitor C1 is electrically connected to the first signal line L1 or the second signal line L2, the first signal line L1 can be set on the same layer as the second signal line L2. That is, the second plate E2 of the first capacitor C1 is set on the same layer as the first signal line L1 and the second signal line L2. In this case, the number of steps in the manufacturing process of the display panel 001 can be reduced, saving time and cost.

[0072] The storage capacitor in the photodetector circuit 10 is typically formed by the capacitance between the anode and cathode of the photosensitive device 10'. Due to the large distance between the anode and cathode, the capacitance value of the storage capacitor is relatively small. Even if the capacitance value of the storage capacitor in the second photodetector circuit 10b is increased by increasing the area between the anode and cathode, the increase in capacitance value is limited due to the large distance between the anode and cathode.

[0073] In this embodiment, by adding a first capacitor C1 to the second light detection circuit 10b, and having the first plate E1 and the second plate E2 of the first capacitor C1 disposed on the same layer as the cathode of the second photosensitive device 10'b and the first signal line L1 and / or the second signal line L2, it is easy to obtain a first capacitor C1 with a large capacitance value.

[0074] Figure 7 for Figure 1 A schematic cross-sectional view along the N1-N2 direction.

[0075] In one embodiment of this application, combined with Figure 1 and Figure 7 The display panel 001 includes multiple second light detection circuits 10b, and at least two of the second light detection circuits 10b each include a first capacitor C1 with a different capacitance value. By using different capacitance values ​​for the first capacitors C1 in the multiple second light detection circuits 10b, the detection accuracy of the second light detection circuits 10b can be increased.

[0076] Figure 7 The capacitance of the first capacitor C1 can be roughly represented by the area of ​​the two plates facing each other. Figure 7 In the three second light detection circuits 10b shown, the capacitance value of the first capacitor C1 in each second light detection circuit 10b is different. It should be noted that... Figure 7 The capacitance values ​​of the first capacitors C11, C12, and C13 in the three second optical detection circuits 10b arranged from left to right decrease sequentially. However, this application does not limit the pattern of capacitance change of the first capacitor C1 in the second optical detection circuits 10b at different positions.

[0077] In one application scenario, at least some of the second light detection circuits 10b within the display panel 001 include first capacitors C1 with different capacitance values. A portion of these second light detection circuits 10b, in conjunction with a second photosensitive device 10'b, can detect light signals within a specific intensity range, and another portion of these second light detection circuits 10b, in conjunction with a second photosensitive device 10'b, can detect light signals within another specific intensity range. Taking the second light detection circuit 10b and its electrically connected second photosensitive device 10'b for detecting ambient light as an example, when the ambient light brightness is high, the second light detection circuit 10a, including the first capacitor C1 with a smaller capacitance value, can operate and is less affected by the display light emitted from the display panel 001, exhibiting higher sensitivity. When the ambient light brightness is low, the first light detection circuit 10a, including the first capacitor C1 with a larger capacitance value, can operate and is less affected by the display light emitted from the display panel 001.

[0078] In this application scenario, the capacitance values ​​of the first capacitors C1 included in the multiple second light detection circuits 10b in the display panel 001 are different, and these second light detection circuits 10b can work in different time periods according to the intensity of the light signal.

[0079] In one application scenario, the capacitance values ​​of the first capacitors C1 included in the multiple second optical detection circuits 10b are different. Then, these second optical detection circuits 10b, together with the second photosensitive device 10'b, can detect light signals of different intensities at the same time period and take the average value as the final detection result, thereby improving the detection accuracy.

[0080] In one technical solution corresponding to this embodiment, such as Figure 1 As shown, the display panel 001 includes at least one first region A1, and the first region A1 can be as follows: Figure 1 The first region A1 is located at a corner of the display area AA in the display panel 001. Alternatively, the first region A1 can also be located at at least one of the left, right, top, or bottom edges of the display area AA in the display panel 001. Since the first region A1 includes multiple second-type light detection units 02, it also includes multiple second light detection circuits 10b. Furthermore, the capacitance values ​​of the first capacitors C1 included in at least two of the second light detection circuits 10b in the first region A1 are different.

[0081] Since the light signal intensity may vary in different areas of the display panel 001, this technical solution is equivalent to setting multiple second light detection circuits 10b, each containing a different first capacitor C1, in a relatively concentrated manner in at least one area of ​​the display panel 001, so that the light signal intensity at the same position of the display panel 001 can be detected more accurately.

[0082] Figure 8 for Figure 1 The diagram shown is an equivalent circuit diagram of a first type of light detection unit in the display panel. Figure 9 for Figure 1 The diagram shows an equivalent circuit diagram of a second type of light detection unit in the display panel.

[0083] In one embodiment of this application, such as Figure 8 and Figure 9 As shown, the reading module 11 / 21 includes a first transistor M1, the sensing module 12 / 22 includes a second transistor M2, and the reset module 13 / 23 includes a third transistor M3. The gate of the second transistor M2 is electrically connected to the output terminal OUT of the photosensitive device 10' and the third transistor M3. The input terminal of the second transistor M2 is electrically connected to the first signal line L1, and the output terminal of the second transistor M2 is electrically connected to the input terminal of the first transistor M1. The gate of the first transistor M1 is electrically connected to the first scan line S1, the input terminal of the first transistor M1 is electrically connected to the output terminal of the second transistor M2, and the output terminal of the first transistor M1 is electrically connected to the reading signal line RL. The gate of the third transistor M3 is electrically connected to the second scan line S2, the input terminal of the third transistor M3 is electrically connected to the reset signal line REF, and the output terminal of the third transistor M3 is electrically connected to the gate of the first transistor M1.

[0084] The reset signal line REF, which is electrically connected to the input terminal of the third transistor M3, and the first signal line L1, which is electrically connected to the input terminal of the second transistor M2, can be multiplexed, that is, the input terminal of the third transistor M3 can be electrically connected to the first signal line L1.

[0085] In one embodiment of this application, the second transistor M2 included in the sensing module 12 / 22 is an N-type transistor.

[0086] In one technical solution corresponding to this embodiment, the second transistor M2 included in the sensing module 12 / 22 includes a metal oxide semiconductor layer.

[0087] In order to prevent the potential of the gate and output terminal of the second transistor M2 from changing due to leakage current, at least one of the third transistor M3 and the first transistor M1, which are electrically connected to the gate and output terminal of the second transistor M2 respectively, can be a dual-gate transistor.

[0088] Similarly, to prevent the potential of the gate and output terminal of the second transistor M2 from changing due to leakage current, at least one of the third transistor M3 and the first transistor M1, which are electrically connected to the gate and output terminal of the second transistor M2 respectively, can be an N-type transistor.

[0089] Furthermore, at least one of the first transistor M1 and the third transistor M3 may include a metal-oxide-semiconductor layer.

[0090] Figure 10 This is a timing diagram of the operation of a light detection circuit in a display panel provided in an embodiment of this application.

[0091] Combination Figure 10 and Figure 8 , Figure 9 The following describes the operation of the photodetector circuit 10 in conjunction with timing. The operating cycle of the photodetector circuit 10 includes a reset phase T1, an integration phase T2, and a readout phase T3. The explanation will be based on the example where the first transistor M1, the second transistor M2, and the third transistor M3 are all N-type transistors.

[0092] During the reset phase T1, the second scan line S2 receives the enable signal (high level signal), the third transistor M3 is turned on, and the reset signal on the reset signal line REF is transmitted to the gate of the second transistor M2 to reset the gate of the second transistor M2.

[0093] During the integration phase T2, both the first scan line S1 and the second scan line S2 transmit non-enable signals (low-level signals), and both the first transistor M1 and the third transistor M3 are turned off. At this time, the photosensitive device 10' integrates the received optical signal and converts it into an electrical signal before transmitting it to the gate of the first transistor M1.

[0094] During the reading phase T3, the first scan line S1 receives an enable signal (high-level signal), the first transistor M1 is turned on, and the reading signal line RL receives the signal from the output terminal of the second transistor M2 through the turned-on first transistor M1.

[0095] It should be noted that the above description only illustrates the operation of one working cycle of the optical detection circuit 10, and the working cycles of both the first optical detection circuit 10a and the second optical detection circuit 10b include the above three stages. However, the working cycle frequencies of the first optical detection circuit 10a and the second optical detection circuit 10b may be the same or different; the stages of the working cycle of the first optical detection circuit 10a may or may not be performed simultaneously with the same stages in the working cycle of the second optical detection circuit 10b.

[0096] Figure 11 This is a schematic diagram of a display panel provided in an embodiment of this application. Figure 12 for Figure 11 The equivalent circuit diagram of the first type of light detection unit and the second type of light detection unit in area A2 of the display panel is shown.

[0097] In one embodiment of this application, such as Figure 11 and Figure 12 As shown, at least one first transistor M1 in the second light detection circuit 10b shares a scan line with at least a portion of the first transistor M1 in the first light detection circuit 10a. For example, the gates of the first transistors M1 in the second light detection circuit 10b and the first light detection circuit 10a, which are located in the same row, can be connected to the same first scan line S1.

[0098] Since the optical detection circuits 10 of different rows output signals to the read signal line RL in sequence, the read modules 11 / 21 in the optical detection circuits 10 of different rows need to be turned on in sequence, that is, the first transistor M1 in the optical detection circuits 10 of different rows needs to be turned on in sequence.

[0099] The display panel 001 may include multiple first scan lines S1, each of which is electrically connected to a different shift register 200 in the same shift register circuit 20. At least one first scan line is simultaneously electrically connected to the gate of the first transistor M1 in both the first light detection circuit 10a and the second light detection circuit 10b.

[0100] By setting the first transistor M1 in the first light detection circuit 10a and the first transistor M1 in the second light detection circuit 10b to share the first scan line S1, the number of first scan lines S1 can be reduced and the driving difficulty can be reduced.

[0101] By setting the switching states of the first transistor M1 in the first light detection circuit 10a and the first transistor M1 in the second light detection circuit 10b to be controlled by the same shift register circuit 20, the number of shift register circuits can be reduced. At the same time, the signal transmitted by the driver chip 30 to the shift register circuit 20 can generate the signal controlling the switching state of the first transistor, reducing the number of leads from the driver chip 30 to the display panel 001 and making it easier to achieve a narrow bezel.

[0102] In one technical solution corresponding to this embodiment, such as Figure 12 As shown, at least one third transistor M3 in the second photodetector circuit 10b shares a scan line with at least a portion of the third transistor M3 in the first photodetector circuit 10a. For example, the gates of the third transistors M2 included in the second photodetector circuit 10b and the first photodetector circuit 10a, which are located in the same row, can be connected to the same second scan line S2.

[0103] It should be noted that the reset phase T1 in the optical detection circuits 10 of different rows can be performed simultaneously or sequentially.

[0104] When the reset phase T1 in the light detection circuit 10 of different rows is performed simultaneously, multiple second scan lines S2 in the display panel 001 can be electrically connected together and electrically connected to the driver chip 30. The driver chip 30 provides enable and disable signals for the second scan lines S2.

[0105] When the reset phase T1 in the light detection circuits 10 of different rows is performed sequentially, the multiple second scan lines S2 in the display panel 001 can be electrically connected to different shift registers in the shift register circuit. The shift register circuit to which the second scan line S2 is electrically connected is different from the shift register circuit to which the first scan line S1 is electrically connected.

[0106] Figure 13 This is a schematic diagram of a display panel provided in an embodiment of this application. Figure 14 This is a schematic diagram of a display panel provided in an embodiment of this application. Figure 15 for Figure 13 and Figure 14 The equivalent circuit diagram of the first type of light detection unit and the second type of light detection unit in area A3 of the display panel is shown.

[0107] In one embodiment of this application, combined with Figure 13 , Figure 14 and Figure 15At least a portion of the first transistor M1 in the second light detection circuit 10b is connected to different scan lines as the first transistor M1 in the first light detection circuit 10a. For example, the display panel 001 includes multiple first scan lines S1, and the multiple first scan lines S1 include a first sub-scan line S11 and a second sub-scan line S12. The gate of the first transistor M1 in the first light detection circuit 10a is electrically connected to the first sub-scan line S11, and the gate of the first transistor M1 in the second light detection circuit 10b is electrically connected to the second sub-scan line S12.

[0108] When the gates of the first transistors M1 included in the first optical detection circuit 10a and the second optical detection circuit 10b are respectively connected to different scan lines, the first optical detection circuit 10a and the second optical detection circuit 10b can be driven more flexibly. For example, the operating cycle frequency of the first optical detection circuit 10a is different from that of the second optical detection circuit 10b; for example, the duration of the reading phase T3 of the first optical detection circuit 10a is different from that of the second optical detection circuit 10b.

[0109] In one implementation of this embodiment, such as Figure 13 As shown, the display panel 001 includes a first shift register circuit 21 and a second shift register circuit 22. The first shift register circuit 21 includes multiple cascaded first shift registers 201, and the second shift register circuit 22 includes multiple cascaded second shift registers 202. The first sub-scan line S11, electrically connected to the first transistor M1 in the first light detection circuit 10a, is electrically connected to the first shift register 201 in the first shift register circuit 21. The second sub-scan line S12, electrically connected to the first transistor M1 in the second light detection circuit 10b, is electrically connected to the second shift register 202 in the second shift register circuit 22.

[0110] Among them, such as Figure 13 As shown, the second shift register circuit 22 can be located on the side of the first shift register circuit 21 away from the display area AA of the display panel 001. Although placing the second shift register circuit 22 on the side of the first shift register circuit 21 away from the display area AA will increase the distance between the second shift register circuit 22 and the electrically connected second light detection circuit 10b, since the second light detection circuit 10b is usually located near the edge of the display area AA, it can still be ensured that the voltage drop of the signal line between the second shift register circuit 22 and the second light detection circuit 10b will not be too large.

[0111] In one implementation of this embodiment, such as Figure 14As shown, the scan line electrically connected to the first transistor M1 in the second light detection circuit 10b is electrically connected to the driver chip 30, that is, the second sub-scan line S12 is electrically connected to the driver chip 30. Then the driver chip 30 can provide the second sub-scan line S12 with a signal to control the switching state of the first transistor M1 in the second light detection circuit 10b.

[0112] At this time, the first transistor M1 in the first optical detection circuit 10a is electrically connected to the scan line and the shift register 200 included in the shift register circuit 20, that is, the first sub-scan line S11 is electrically connected to the shift register 200 included in the shift register circuit 20.

[0113] In one technical solution corresponding to this embodiment, such as Figure 15 As shown, the third transistor M3 in any second light detection circuit 10b is connected to different scan lines as at least some of the third transistors M3 in the first light detection circuit 10a. For example, the display panel 001 includes multiple second scan lines S2, and the multiple second scan lines S2 include a third sub-scan line S21 and a fourth sub-scan line S22. The gate of the third transistor M3 in the first light detection circuit 10a is electrically connected to the third sub-scan line S21, and the gate of the third transistor M3 in the second light detection circuit 10b is electrically connected to the fourth sub-scan line S22.

[0114] It should be noted that the reset phase T1 in the first optical detection circuit 10a of different rows can be performed simultaneously or sequentially; the reset phase T1 in the second optical detection circuit 10b of different rows can be performed simultaneously or sequentially.

[0115] When the reset phase T1 in the first light detection circuit 10a of different rows is performed simultaneously, multiple third sub-scan lines S21 in the display panel 001 can be electrically connected together and electrically connected to the driver chip 30. The driver chip 30 provides enable and disable signals to the third sub-scan lines S21.

[0116] When the reset phase T1 in the first light detection circuit 10a of different rows is performed sequentially, the multiple third sub-scan lines S21 in the display panel 001 can be electrically connected to different shift registers in the shift register circuit. The shift register circuit to which the third sub-scan line S21 is electrically connected is different from the shift register circuit to which the first sub-scan line S11 is electrically connected.

[0117] When the reset phase T1 in the second light detection circuit 10b of different rows is performed simultaneously, multiple fourth sub-scan lines S22 in the display panel 001 can be electrically connected together and electrically connected to the driver chip 30. The driver chip 30 provides enable and disable signals for the fourth sub-scan lines S22.

[0118] When the reset phase T1 in the second light detection circuit 10b of different rows is performed sequentially, the multiple fourth sub-scan lines S22 in the display panel 001 can be electrically connected to different shift registers in the shift register circuit. The shift register circuit to which the fourth sub-scan line S22 is electrically connected is different from the shift register circuit to which the second sub-scan line S12 is electrically connected.

[0119] Figure 16 for Figure 15 The timing diagrams of the optical detection circuits in the first type of optical detection unit and the second type of optical detection unit are shown.

[0120] In one technical solution corresponding to this embodiment, the frequency of the scan line connected to the first transistor M1 in the first optical detection circuit 10a of the first type of optical detection unit 01 receiving the enable signal is f1, and the frequency of the scan line connected to the first transistor M1 in the second optical detection circuit 10b of the second type of optical detection unit 02 receiving the enable signal is f2, where f2 < f1. That is, the frequency of the enable signal received by the second sub-scan line S12 is less than the frequency of the enable signal received by the first sub-scan line S11.

[0121] Correspondingly, the scan line electrically connected to the third transistor M3 in the first optical detection circuit 10a of the first type of optical detection unit 01 receives the enable signal at a frequency of f3, and the scan line electrically connected to the fourth transistor M4 in the second optical detection circuit 10b of the second type of optical detection unit 02 receives the enable signal at a frequency of f4, where f4 < f3. That is, the frequency at which the fourth sub-scan line S22 receives the enable signal is less than the frequency at which the third sub-scan line S21 receives the enable signal.

[0122] In this technical solution, the operating cycle Ta frequency of the second optical detection circuit 10b is less than the operating cycle Tb frequency of the first optical detection circuit 10a. Therefore, the time of the integration phase T2b of the second optical detection circuit 10b is increased relative to the duration of the integration phase T2a of the first optical detection circuit 10a, thereby increasing the optical signal received by the second type of optical detection unit 02, which is beneficial to improving the detection accuracy of the second optical detection circuit 10b.

[0123] In this technical solution, the reset phase T1b in the operating cycle Tb of the second optical detection circuit 10b can be performed simultaneously with the reset phase T1a in the operating cycle Ta of the first optical detection circuit 10a. However, while the reset phase T1a in some operating cycles Ta of the first optical detection circuit 10a is in progress, the second optical detection circuit 10b can be in the integration phase T2b. Similarly, the readout phase T3b in the operating cycle Tb of the second optical detection circuit 10b can be performed simultaneously with the readout phase T3a in the operating cycle Ta of the first optical detection circuit 10a. However, while the readout phase T3a in some operating cycles Ta of the first optical detection circuit 10a is in progress, the second optical detection circuit 10b can be in the integration phase T2b. Therefore, the second optical detection circuit 10b can share the reset signal line REF and the readout signal line RL with a portion of the first optical detection circuit 10a.

[0124] Figure 17 for Figure 1 A schematic cross-sectional view along the L1-L2 direction.

[0125] In one embodiment of this application, such as Figure 17 As shown, the display panel 001 also includes a light-shielding layer SL, which is disposed on the side of the film layer containing the photosensitive device 10' facing the light-emitting surface of the display panel 001. The photosensitive device 10', the light detection circuit 10, and the light-shielding layer SL can be disposed on one side of the substrate, with the photosensitive device 10' disposed on the side of the film layer containing the light detection circuit 10 away from the substrate, and the light-shielding layer SL disposed on the side of the photosensitive device 10' away from the substrate.

[0126] The light-shielding layer SL includes a first opening H1 and a second opening H2. Along a direction perpendicular to the surface of the display panel 001, the first opening H1 at least partially overlaps with the first photosensitive device 10'a, and the second opening H2 at least partially overlaps with the second photosensitive device 10'b. The light-shielding layer SL has a first opening H1 corresponding to the first photosensitive device 10'a, and the first opening H1 is used to expose at least a portion of the first photosensitive device 10'a. The first photosensitive device 10'a can receive the light signal it needs to detect through the first opening H1. The light-shielding layer SL also has a second opening H2 corresponding to the second photosensitive device 10'b, and the second opening H2 is used to expose at least a portion of the second photosensitive device 10'b. The second photosensitive device 10'b can receive the light signal it needs to detect through the second opening H2.

[0127] Figure 18 for Figure 1 A schematic cross-sectional view along the L1-L2 direction. Figure 19 for Figure 18 A schematic diagram showing the projection of the light-shielding layer and the light-sensing device.

[0128] In one technical solution corresponding to this embodiment, such as Figure 18 and Figure 19 As shown, the area of ​​the second opening H2 is larger than the area of ​​the first opening H1. Therefore, the second photosensitive device 10'b can obtain a light signal with a greater signal intensity from the second opening H2, which has a larger opening area. This increases the amount of light signal that the second type of photodetector 02 needs to detect, and can increase the detection accuracy of the second photodetector circuit 10b.

[0129] It should be noted that the first opening H1 and the second opening H2 in the light-shielding layer SL are typically formed by dry etching or wet etching of the light-shielding layer SL, with wet etching being the most common method. During the wet etching process of the light-shielding layer SL to form the first opening H1 and the second opening H2, the bottom and top areas of the first opening H1 and the second opening H2 are usually different. Therefore, the opening area of ​​the first opening H1 refers to the area of ​​the smaller of the bottom and top areas, usually the bottom area; the opening area of ​​the second opening H2 refers to the area of ​​the smaller of the bottom and top areas, usually the bottom area.

[0130] Figure 20 for Figure 1 A schematic cross-sectional view along the L1-L2 direction.

[0131] In one technical solution corresponding to this embodiment, as shown in 19, the display panel 001 includes a plurality of light-emitting devices (LDs) and a black pixel definition layer (BPDL). The black pixel definition layer (BPDL) includes a plurality of pixel openings, and at least a portion of the light-emitting devices (LDs) is disposed within the pixel openings of the black pixel definition layer (BPDL). For example, the light-emitting device (LD) can specifically be an organic light-emitting diode (OLED), and the pixel openings can be filled with the organic light-emitting material of the organic light-emitting diode.

[0132] In this technical solution, the light-shielding layer SL can reuse the black pixel definition layer BPDL. That is, the black pixel definition layer BPDL can have a first opening H1 and a second opening H2 corresponding to the first photosensitive device 10'a and the second photosensitive device 10'b, respectively. Therefore, the black pixel definition layer BPDL can serve as the light-shielding layer SL in this embodiment. Reusing the black pixel definition layer BPDL as the light-shielding layer SL can reduce the thickness of the display panel 001 and reduce the manufacturing process steps and costs of the display panel 001.

[0133] Figure 21 for Figure 1 A schematic cross-sectional view along the L1-L2 direction.

[0134] In one technical solution corresponding to this embodiment, such as Figure 21As shown, the display panel 001 includes multiple light-emitting devices (LDs), a black matrix layer BL, and multiple color resists (CFs). The black matrix layer BL and color resists are both disposed on the side of the film layer containing the light-emitting devices (LDs) away from the substrate. The black matrix layer BL includes multiple color resist openings, which overlap with the light-emitting devices (LDs) along a direction perpendicular to the surface of the display panel 001. The color resist openings are filled with color resists (CFs), and the color of the color resists (CFs) filling the openings is the same as the emission color of the light-emitting device (LD) corresponding to the color resist opening. This ensures that the display light emitted by the light-emitting devices (LDs) is converted into purer light after passing through the color resists (CFs) before being emitted from the light-emitting surface of the display panel 001.

[0135] In this technical solution, the light-shielding layer SL can reuse the black matrix layer BL. That is, the black matrix layer BL can have a first opening H1 and a second opening H2 corresponding to the first photosensitive device 10'a and the second photosensitive device 10'b, respectively. Thus, the black matrix layer BL can be used as the light-shielding layer SL in this embodiment. Reusing the black matrix layer BL as the light-shielding layer SL can reduce the thickness of the display panel 001 and reduce the manufacturing process steps and costs of the display panel 001.

[0136] Figure 22 for Figure 1 A schematic cross-sectional view along the L1-L2 direction.

[0137] In one technical solution corresponding to this embodiment, such as Figure 22 As shown, the light-shielding layer SL includes a first sub-light-shielding layer SL1 and a second sub-light-shielding layer SL2, with the first sub-light-shielding layer SL1 multiplexing the black pixel definition layer BPDL and the second sub-light-shielding layer SL2 multiplexing the black matrix layer BL. Correspondingly, the first opening H1 includes an opening H1a in the black pixel definition layer BPDL and an opening H1b in the black matrix layer BL, with openings H1a and H1b overlapping in a direction perpendicular to the surface of the display panel 001; the second opening H2 includes an opening H2a in the black pixel definition layer BPDL and an opening H2b in the black matrix layer BL, with openings H2a and H2b overlapping in a direction perpendicular to the surface of the display panel 001.

[0138] Wherein, the opening areas of openings H1a and H1b included in the first opening H1 may be the same or different; and / or, the opening areas of openings H2a and H2b included in the second opening H2 may be the same or different.

[0139] When the opening areas of openings H1a and H1b included in the first opening H1 are different, the opening area of ​​opening H1a opened by the first sub-shielding layer SL1 can be smaller than the opening area of ​​opening H1b opened by the second sub-shielding layer SL2. Since the second sub-shielding layer SL2 is closer to the light-emitting surface of the display panel 001 than the first sub-shielding layer SL1, when the opening area of ​​opening H1b opened by the second sub-shielding layer SL2 is larger, more light signal required by the first photosensitive device 10'a can enter the display panel 001; since the first sub-shielding layer SL1 is closer to the film layer where the light-emitting device LD is located than the second sub-shielding layer SL2, when the opening area of ​​opening H1a opened by the first sub-shielding layer SL1 is smaller, the influence of the light emitted by the light-emitting device LD on the light signal detection of the first photosensitive device 10'a can be effectively reduced.

[0140] When the opening areas of openings H2a and H2b included in the second opening H2 are different, the opening area of ​​opening H2a opened by the first sub-shielding layer SL1 can be smaller than the opening area of ​​opening H2b opened by the second sub-shielding layer SL2. Since the second sub-shielding layer SL2 is closer to the light-emitting surface of the display panel 001 than the first sub-shielding layer SL1, when the opening area of ​​opening H2b opened by the second sub-shielding layer SL2 is larger, more light signals required by the second photosensitive device 10'b can enter the display panel 001; since the first sub-shielding layer SL1 is closer to the film layer where the light-emitting device LD is located than the second sub-shielding layer SL2, when the opening area of ​​opening H2a opened by the first sub-shielding layer SL1 is smaller, the influence of the light emitted by the light-emitting device LD on the light signal detection of the second photosensitive device 10'b can be effectively reduced.

[0141] Figure 23 for Figure 1 A schematic cross-sectional view along the L1-L2 direction.

[0142] In one embodiment of this application, such as Figure 23 As shown, the display panel 001 includes multiple color resists CF, but the second opening H2 is not filled with color resists CF, that is, the side of the second light sensor 10'b that receives the light signal is not provided with color resists CF. At this time, the second light sensor 10'b can receive more ambient light, improving the detection accuracy of the second light detection circuit 10b.

[0143] In one technical solution of this embodiment, the first opening H1 is filled with a color resist CF. In the orthographic projection onto the substrate ST, the color of the color resist CF filling the first opening H1 is the same as the emission color of at least one light-emitting device LD. Therefore, the color of the color resist filling the first opening H1 is the same as the emission color of at least one sub-pixel adjacent to the first opening H1.

[0144] In this embodiment, the light-shielding layer SL can at least partially reuse the black matrix layer BL, and the color of the color resist filled in the first opening H1 and at least one adjacent color resist opening can be the same. For example, as Figure 23 As shown, if a first opening H1 is filled with red color resist RCF, then at least one color resist opening adjacent to the first opening H1 is also filled with red color resist RCF; or Figure 23 The first opening H1 shown can also be filled with blue color resist BCF. Since at least one color resist opening adjacent to the first opening H1 is also filled with blue color resist BCF, the display light emitted by the light-emitting device LD below the color resist opening can be reused as the detection light for the light signal detected by the first photosensitive device 10'a. For example, if the first type of light detection unit 01 is used for fingerprint recognition, the detection light required during the fingerprint recognition process can come from the display light emitted by the light-emitting device LD. Therefore, the color of the light signal received by the first photosensitive device 10'a is the same as the color of the detection light emitted by the adjacent at least one light-emitting device LD, which can ensure the detection accuracy of the first type of light detection unit 01.

[0145] Figure 24 for Figure 1 A schematic cross-sectional view along the N1-N2 direction. Figure 25 for Figure 24 A schematic diagram of the projection of the middle part of the structure.

[0146] In one embodiment of this application, such as Figure 24 As shown, the display panel 001 also includes multiple color resists CF, and the second opening H2 is filled with color resist CF. The color resist CF can be filled within the second opening H2 to enable the display panel 001 to detect light signals in specific application scenarios. For example, when at least a portion of the second opening H2 is filled with red color resist CF, the second photosensitive device 10'b and its second light detection circuit 10b corresponding to these second openings H2 can detect red light in the environment, thereby determining whether the environment in which the display panel 001 is located has a high temperature.

[0147] The first opening H1 may be filled with color resist CF or not. When the first opening H1 is filled with color resist CF, the specific filling method can be referred to the previous embodiment, and will not be repeated here.

[0148] In one technical solution corresponding to this embodiment, such as Figure 24 As shown, the display panel 001 also includes multiple light-emitting devices (LDs) with different light-emitting colors. Figure 24 The diagram illustrates a blue light-emitting device (BLD) and a red light-emitting device (RLD). In addition, the display panel 001 may also include a green light-emitting device (GLD).

[0149] Combination Figure 24 and Figure 25 In the orthographic projection onto the substrate ST, adjacent to the second opening H2 and the light-emitting device LD, the color of the color resist CF filling the second opening H2 is different from the color emitted by the light-emitting device LD. Figure 24 and Figure 25 Taking the structure shown as an example, the light-emitting devices (LDs) on both sides of the area where the middle second opening H2 is located are a blue light-emitting device (BLD) and a red light-emitting device (RLD), respectively. The color resist (CF) filling the middle second opening H2 is a green color resist (GCF). Therefore, the blue light emitted by the blue light-emitting device BLD and the red light emitted by the red light-emitting device RLD will be blocked by the green color resist (GCF) and will not enter the second photosensitive device 10'b below the second opening H2. Thus, this technical solution can effectively avoid interference from the light emitted by the light-emitting devices (LDs) when the second type of light detection unit 02 detects light signals. For example, it can avoid interference from the light emitted by the light-emitting devices (LDs) on ambient light detection.

[0150] In one embodiment of this application, such as Figure 24 As shown, at least two of the second openings H2 are filled with color resist CF of different colors. For example, Figure 24 The diagram illustrates three second openings H2, each filled with a red color resist RCF, a green color resist GCF, and a blue color resist BCF, respectively.

[0151] Figure 26 for Figure 1 A schematic cross-sectional view along the N1-N2 direction.

[0152] It should be noted that when the first sub-light-shielding layer SL1 of the light-shielding layer SL reuses the black pixel definition layer BPDL and the second sub-light-shielding layer SL2 reuses the black matrix layer BL, the first opening H1 includes openings H1a and H1b that overlap along the plane perpendicular to the display panel 001 and are respectively opened on the first sub-light-shielding layer SL1 and the second sub-light-shielding layer SL2, and the second opening H2 includes openings H2a and H2b that overlap along the plane perpendicular to the display panel 001 and are respectively opened on the first sub-light-shielding layer SL1 and the second sub-light-shielding layer SL2. Correspondingly, when at least a portion of the first opening H1 and / or at least a portion of the second opening H2 is filled with a color resist CF, such as Figure 26 As shown, the color resist CF can be filled in at least a portion of the openings H1b and / or at least a portion of the openings H2b of the second sub-shielding layer SL2, without needing to be filled in the openings H1a and / or the openings H2a of the first sub-shielding layer SL1.

[0153] Figure 27 for Figure 1 A schematic cross-sectional view along the N1-N2 direction. Figure 28for Figure 27 A schematic diagram of the middle light-shielding layer.

[0154] In one embodiment of this application, such as Figure 27 and Figure 28 As shown, the plurality of second openings H2 include a first sub-opening H21 and a second sub-opening H22. The color resist CF filled in the first sub-opening H21 is different from the color resist CF filled in the second sub-opening H22, and the opening areas of the first sub-opening H21 and the second sub-opening H22 are different.

[0155] In one technical solution, the first sub-opening H21 is filled with red color resist RCF, and the second sub-opening H22 is filled with green color resist GCF or blue color resist BCF, and the opening area of ​​the first sub-opening H21 is larger than the opening area of ​​the second sub-opening H22. That is, the opening area of ​​the second opening H2 filled with red color resist RCF is larger than the area of ​​the second opening H2 filled with green color resist GCF, and / or, the opening area of ​​the second opening H2 filled with red color resist RCF is larger than the area of ​​the second opening H2 filled with blue color resist BCF.

[0156] One implementation method is, for example Figure 27 and Figure 28 As shown, the first sub-opening H21 is filled with red color resist RCF, and at least a portion of the second sub-opening H22 is filled with green color resist GCF. The opening area of ​​the first sub-opening H21 is larger than the opening area of ​​the at least portion of the second sub-opening H22. That is, the opening area of ​​the second opening H2 filled with red color resist RCF is larger than the area of ​​the second opening H2 filled with green color resist GCF.

[0157] When the second photosensitive device 10'b is a photodiode, the sensitivity of the photodiode detecting green light is higher than that of the photodiode detecting red light. By setting a larger opening area of ​​the second opening H2 filled with red color resist RCF, that is, increasing the amount of light signal received by the second photosensitive device 10'b for detecting red light per unit time, the detection sensitivity of the second photosensitive device 10'b for detecting red light and the second photosensitive device 10'b for detecting green light are balanced.

[0158] One implementation method is, for example Figure 27 and Figure 28 As shown, the first sub-opening H21 is filled with red color resist RCF, and at least a portion of the second sub-opening H22 is filled with blue color resist BCF. The opening area of ​​the first sub-opening H21 is larger than the opening area of ​​the at least portion of the second sub-opening H22. That is, the opening area of ​​the second opening H2 filled with red color resist RCF is larger than the area of ​​the second opening H2 filled with blue color resist BCF.

[0159] When the second photosensitive device 10'b is a photodiode, the sensitivity of the photodiode detecting blue light is higher than that of the photodiode detecting red light. By setting a larger opening area of ​​the second opening H2 filled with red color resist RCF, that is, increasing the amount of light signal received by the second photosensitive device 10'b for detecting red light per unit time, the detection sensitivity of the second type of light detection unit 02 for detecting red light and the second type of light detection unit 02 for detecting blue light are balanced.

[0160] One implementation method is, for example Figure 27 and Figure 28 As shown, the first sub-opening H21 is filled with red color resist (RCF), a portion of the second sub-opening H22 is filled with green color resist (GCF), and a portion of the second sub-opening H22 is filled with blue color resist (BCF). The opening area of ​​the first sub-opening H21 is larger than the opening area of ​​the second sub-opening H22 filled with green color resist (GCF) and also larger than the opening area of ​​the second sub-opening H22 filled with blue color resist (BCF). The opening areas of the second sub-opening H22 filled with green color resist (GCF) and the second sub-opening H22 filled with blue color resist (BCF) may be equal or unequal.

[0161] Figure 29 for Figure 1 A schematic cross-sectional view along the N1-N2 direction.

[0162] In one embodiment of this application, such as Figure 29 As shown, the plurality of second openings H2 include a first sub-opening H21 and a second sub-opening H22, the plurality of second photosensitive devices 10'b include a first sub-photosensitive device 10'b1 and a second sub-photosensitive device 10'b2, and the plurality of second light detection circuits 10b include a first sub-light detection circuit 10b1 and a second sub-light detection circuit 10b2. Along a direction perpendicular to the surface of the display panel 001, the first sub-photosensitive device 10'b1 at least partially overlaps with the first sub-opening H21, and the second sub-photosensitive device 10'b2 overlaps with the second sub-opening H22; the first sub-light detection circuit 10b1 is electrically connected to the first sub-photosensitive device 10'b1, and the second sub-light detection circuit 10b2 is electrically connected to the second sub-photosensitive device 10'b2.

[0163] The color resist CF filling the first sub-opening H21 is different in color from the color resist filling the second sub-opening H22, and the capacitance value of the first capacitor C1 in the first sub-light detection circuit 10b1 is not equal to the capacitance value of the first capacitor C1 in the second sub-light detection circuit 10b2.

[0164] In one technical solution, the first sub-opening H21 is filled with a red color resistor RCF, and the second sub-opening H22 is filled with a green color resistor GCF or a blue color resistor BCF. Furthermore, the capacitance value of the first capacitor C1 in the first sub-light detection circuit 10b1 is less than the capacitance value of the first capacitor C1 in the second sub-light detection circuit 10b2. That is, the capacitance value of the first capacitor C1R in the second light detection circuit 10b used for detecting red light is less than the capacitance value of the first capacitor C1G in the second light detection circuit 10b used for detecting green light, and / or, the capacitance value of the first capacitor C1R in the second light detection circuit 10b used for detecting red light is less than the capacitance value of the first capacitor C1B in the second light detection circuit 10b used for detecting blue light.

[0165] One implementation method is, for example Figure 29 As shown, the first sub-opening H21 is filled with a red color resistor RCF, and at least part of the second sub-opening H22 is filled with a green color resistor GCF. The capacitance value of the first capacitor C1 in the first sub-photodetector circuit 10b1 is smaller than the capacitance value of the first capacitor C1 in the second sub-photodetector circuit 10b2 corresponding to these second sub-openings H22. Specifically, as... Figure 28 As shown, the first sub-opening H21 is filled with red color resist RCF and the second sub-opening H22G is filled with green color resist GCF. The second sub-opening H22G exposes the second sub-photosensor 10'b2G. The capacitance value of the first capacitor C1G in the second sub-photosensor circuit 10b2G, which is electrically connected to the second sub-photosensor 10'b2G, is greater than the capacitance value of the first capacitor C1R in the first sub-photosensor circuit 10b1.

[0166] In this implementation, the capacitance value of the first capacitor C1R in the second light detection circuit 10b used for detecting red light is less than the capacitance value of the first capacitor C1G in the second light detection circuit 10b used for detecting green light. Therefore, the sensitivity of the second light detection circuit 10b used for detecting red light is higher than that of the second light detection circuit 10b used for detecting green light, thereby balancing the sensitivity of the second type of light detection unit 02 used for detecting red light and the second type of light detection unit 02 used for detecting green light.

[0167] One implementation method is, for example Figure 29 As shown, the first sub-opening H21 is filled with red color resist RCF and at least part of the second sub-opening H22 is filled with blue color resist BCF. The capacitance value of the first capacitor C1 in the first sub-light detection circuit 10b1 is smaller than the capacitance value of the first capacitor C1 in the third sub-light detection circuit 10b3 corresponding to these second sub-openings H22. Specifically, as Figure 28As shown, the first sub-opening H21 is filled with red color resist RCF and the second sub-opening H22B is filled with blue color resist BCF. The second sub-opening H22B exposes the second sub-photosensor 10'b2B. The capacitance value of the first capacitor C1B in the second sub-photosensor circuit 10b2B, which is electrically connected to the second sub-photosensor 10'b2B, is greater than the capacitance value of the first capacitor C1R in the first sub-photosensor circuit 10b1.

[0168] In this implementation, the capacitance value of the first capacitor C1R in the second light detection circuit 10b used for detecting red light is less than the capacitance value of the first capacitor C1B in the second light detection circuit 10b used for detecting blue light. Therefore, the sensitivity of the second light detection circuit 10b used for detecting red light is higher than that of the second light detection circuit 10b used for detecting blue light, thereby balancing the sensitivity of the second type of light detection unit 02 used for detecting red light and the second type of light detection unit 02 used for detecting green light.

[0169] One implementation method is, for example Figure 29 As shown, the first sub-opening H21 is filled with a red color resistor RCF, a portion of the second sub-opening H22G is filled with a green color resistor GCF, the second sub-opening H22 is filled with a green color resistor GCF, and a portion of the second sub-opening H22 is filled with a blue color resistor BCF. Therefore, the capacitance value of the first capacitor C1R in the first sub-light detection circuit 10b1 is less than the capacitance value of the first capacitor C1G in the second sub-light detection circuit 10b2 used for detecting green light, and the capacitance value of the first capacitor C1R in the first sub-light detection circuit 10b1 is less than the capacitance value of the first capacitor C1B in the second sub-light detection circuit 10b2 used for detecting blue light. Specifically, as... Figure 28 As shown, the first sub-opening H21 is filled with a red color resist RCF, the second sub-opening H22G is filled with a green color resist GCF, and the second sub-opening H22B is filled with a blue color resist BCF. The second sub-opening H22G exposes the second sub-photosensor 10'b2G, and the second sub-opening H22B exposes the second sub-photosensor 10'b2B. The capacitance value of the first capacitor C1G in the second sub-photosensor 10b2G electrically connected to the second sub-photosensor 10'b2G is greater than the capacitance value of the first capacitor C1R in the first sub-photosensor 10b1, and the capacitance value of the first capacitor C1B in the second sub-photosensor 10b2B electrically connected to the second sub-photosensor 10'b2B is greater than the capacitance value of the first capacitor C1R in the first sub-photosensor 10b1.

[0170] Figure 30 This is a schematic diagram of a display device provided in an embodiment of this application.

[0171] like Figure 30The embodiments shown in this application provide a display device, including a display panel 001 as provided in any of the above embodiments. Exemplary examples show that the display device may be an electronic device such as a mobile phone, computer, smart wearable device (e.g., smartwatch), and in-vehicle display device; this embodiment of the invention does not limit the scope of the application to such devices.

[0172] In the display device provided in this application embodiment, by adding a first capacitor C1 to the control terminal CTR of the sensing module 22 in the second light detection circuit 10b, the load capacitance of the control terminal CTR of the sensing module 22 is increased. Therefore, the second type of light detection unit 02 can start working when the light signal it receives and detects is large, reducing the influence of the display light emitted by the display device on the light signal to be detected by the second type of light detection unit 02, and improving the detection accuracy of the light signal by the second type of light detection unit 02.

[0173] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A display panel, characterized by, The display panel comprises a substrate, a light sensing device arranged on one side of the substrate, and a light detection circuit comprising a sensing module, a reading module and a reset module. The control end of the sensing module is electrically connected with the light sensing device and the reset module; the input end of the sensing module is electrically connected with a first signal line, and the output end of the sensing module is electrically connected with the reading module. The first pole of the light sensing device is electrically connected with a second signal line; the light sensing device comprises a first light sensing device and a second light sensing device, and the light detection circuit comprises a first light detection circuit and a second light detection circuit; the control end of the sensing module in the first light detection circuit is electrically connected with the first light sensing device, and the control end of the sensing module in the second light detection circuit is electrically connected with the second light sensing device. The first light detection circuit further comprises a first capacitor, and the first capacitor is electrically connected with the control end of the sensing module in the second light detection circuit. The first pole plate of the first capacitor is electrically connected with the control end of the sensing module in the second light detection circuit, and the second pole plate of the first capacitor is electrically connected with the first signal line and arranged in the same layer, or the second pole plate of the first capacitor is electrically connected with the second signal line and arranged in the same layer. The capacitive load of the control end of the sensing module in the first light detection circuit is smaller than the capacitive load of the control end of the sensing module in the second light detection circuit. The display panel further comprises a light shielding layer arranged on the side of the film layer where the light sensing device is located and facing the light emitting surface of the display panel. The light shielding layer comprises a first opening and a second opening; in the direction perpendicular to the plane where the display panel is located, the first opening at least partially overlaps with the first light sensing device, and the second opening at least partially overlaps with the second light sensing device.

2. The display panel of claim 1, wherein, The area of the opening of the second opening is larger than the area of the opening of the first opening.

3. The display panel of claim 1, wherein, The display panel further comprises a plurality of color resistances; the first opening is filled with the color resistances, and the second opening is not filled with the color resistances. The display panel further comprises a plurality of color resistances; the second opening is filled with the color resistances.

4. The display panel of claim 3, wherein, The display panel further comprises a plurality of light emitting devices with different light emitting colors.

5. The display panel of claim 3, wherein, In the orthographic projection of the second opening and the light emitting device adjacent to each other on the substrate, the color of the color resistance filled in the second opening is different from the light emitting color of the light emitting device.

6. The display panel of claim 3, wherein, The colors of the color resistances filled in at least two second openings are different.

7. The display panel of claim 6, wherein, The second opening comprises a first sub-opening and a second sub-opening; the color of the color resistance filled in the first sub-opening is different from the color of the color resistance filled in the second sub-opening, and the opening area of the first sub-opening is different from the opening area of the second sub-opening. The first sub-opening is filled with red color resistance, the second sub-opening is filled with green color resistance or blue color resistance, and the opening area of the first sub-opening is larger than the opening area of the second sub-opening.

8. The display panel of claim 6, wherein, The second opening comprises a first sub-opening and a second sub-opening; the color of the color resistance filled in the first sub-opening is different from the color of the color resistance filled in the second sub-opening.

9. The display panel of claim 8, wherein, ​ 10. The display panel of claim 9, wherein, ​ 11. The display panel of claim 8, wherein, ​ The second light sensing device comprises a first sub light sensing device and a second sub light sensing device; in a direction perpendicular to a surface on which the display panel is located, the first sub light sensing device at least partially overlaps the first sub opening, and the second sub light sensing device overlaps the second sub opening; The second light detection circuit comprises a first sub light detection circuit and a second sub light detection circuit, the first sub light detection circuit is electrically connected with the first sub light sensing device, and the second sub light detection circuit is electrically connected with the second sub light sensing device; The capacitance of the first capacitor in the first sub light detection circuit is not equal to the capacitance of the first capacitor in the second sub light detection circuit.

12. The display panel of claim 11, wherein, The first sub opening is filled with a red color resistance, and the second sub opening is filled with a green color resistance or a blue color resistance; the capacitance of the first capacitor in the first sub light detection circuit is less than the capacitance of the first capacitor in the second sub light detection circuit.

13. The display panel of claim 1, wherein, The reading module comprises a first transistor; The first transistor in at least one of the second light detection circuits shares a scan line with the first transistor in at least part of the first light detection circuit.

14. The display panel of claim 1, wherein, The reading module comprises a first transistor; The first transistor in at least part of the second light detection circuit is connected with the first transistor in the first light detection circuit and connected with different scan lines respectively.

15. The display panel of claim 14, wherein, The display panel comprises a first shift register circuit and a second shift register circuit, the first shift register circuit comprises a plurality of cascaded first shift registers, and the second shift register circuit comprises a plurality of cascaded second shift registers; The scan line to which the first transistor in the first light detection circuit is electrically connected is electrically connected with the first shift register in the first shift register circuit; and the scan line to which the first transistor in the second light detection circuit is electrically connected is electrically connected with the second shift register in the second shift register circuit.

16. The display panel of claim 14, wherein, The scan line to which the first transistor in the second light detection circuit is electrically connected is electrically connected with a driving chip.

17. The display panel of claim 14, wherein, The frequency of the enable signal received by the scan line to which the first transistor in the first light detection circuit is electrically connected is f1, and the frequency of the enable signal received by the scan line to which the first transistor in the second light detection circuit is electrically connected is f2, f2 < f1.

18. The display panel of claim 1, wherein, The display panel is provided with a plurality of second light detection circuits; the capacitances of the first capacitors respectively included in at least two of the second light detection circuits are different.

19. The display panel of claim 1, wherein, The sensing module comprises a second transistor, and the gate of the second transistor is electrically connected with the light sensing device and the reset module; The second transistor comprises a metal oxide semiconductor layer.

20. The display panel of claim 1, wherein, The first light sensing device and the second light sensing device are both photosensitive diodes, the first pole of the photosensitive diode is electrically connected with a second signal line, and the second pole of the photosensitive diode is electrically connected with a control end of a sensing module; The first pole plate of the first capacitor is arranged in the same layer as the second pole of the photosensitive diode.

21. A display device comprising: The display panel comprises any one of claims 1-20.

Images