Display panel and display apparatus

Abstract

Provided in the present application are a display panel and a display apparatus. A plurality of pixel circuits comprise first-type pixel circuits and second-type pixel circuits that are both connected to a plurality of light-emitting devices. The first-type pixel circuits and the second-type pixel circuits each comprise a driving transistor. A sensing line is connected to the driving transistors of the second-type pixel circuits to receive an electrical signal that is output by a turned-on driving transistor in the second-type pixel circuits. An external circuit is connected to the sensing line and is configured to acquire the electrical signal.

Description

Display panel and display device Technical Field

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

[0002] Currently, Virtual Reality (VR) products are one of the hottest research topics in the display field. To meet diverse user needs, VR products require high resolution and good brightness uniformity. However, for display devices used in manufacturing VR products, the pixel driving circuits occupy a significant amount of space, making it difficult to simultaneously achieve high resolution and good brightness uniformity. Invention Overview

[0003] In view of this, this application provides a display panel and a display device to achieve both high resolution and brightness uniformity in the display panel and the display device.

[0004] In a first aspect, this application provides a display panel. The display panel has a display area. The display panel includes a plurality of light-emitting devices located in the display area, a plurality of pixel circuits, a sensing line, and an external circuit. The plurality of pixel circuits include a first type of pixel circuit and a second type of pixel circuit, respectively connected to the plurality of light-emitting devices. Both the first type of pixel circuit and the second type of pixel circuit include a driving transistor. The sensing line is connected to the driving transistor of the second type of pixel circuit to receive an electrical signal output by the driving transistor when it is turned on in the second type of pixel circuit. The external circuit is connected to the sensing line and is configured to acquire the electrical signal.

[0005] Secondly, this application also provides a display device, which includes the aforementioned display panel. Beneficial effects

[0006] In some embodiments of the display panel and display device of this application, multiple pixel circuits include a first type of pixel circuit and a second type of pixel circuit. A sensing line is connected to the driving transistor of the second type of pixel circuit to receive the electrical signal output by the driving transistor in the second type of pixel circuit. An external circuit is connected to the sensing line and configured to acquire the electrical signal. Thus, the second type of pixel circuit, the sensing line, and the external circuit work together to detect the electrical signal corresponding to the threshold voltage of the driving transistor of the second type of pixel circuit, while the first type of pixel circuit does not have the function of supporting the detection of electrical signals. The external circuit can obtain the compensation value of the threshold voltage of the driving transistor in the second type of pixel circuit based on the electrical signal, and use the compensation value to compensate the threshold voltage of the driving transistors of the first type of pixel circuit and the second type of pixel circuit, thereby improving the brightness uniformity of the display panel. At the same time, since the first type of pixel circuit does not have the function of supporting the detection of electrical signals, the number of transistors in the first type of pixel circuit is smaller, and the layout area occupied by the first type of pixel circuit is smaller, which is conducive to increasing the number of pixel circuits, enabling the display panel and display device to achieve high-resolution display. In other words, the hybrid design of the first type of pixel circuit and the second type of pixel circuit can take into account both the high resolution and brightness uniformity of the display panel and the display device. Attached Figure Description

[0007] Figure 1 is a schematic diagram of the planar structure of the display panel of some embodiments of this application;

[0008] Figure 2 is a schematic diagram of the cross-sectional structure taken along the A-A' tangent line in the display panel shown in Figure 1;

[0009] Figure 3 is a schematic diagram of a planar structure of multiple pixel circuits disposed in the display area according to some embodiments of this application;

[0010] Figure 4 is a schematic diagram of a planar structure of multiple pixel circuits disposed in the display area according to some other embodiments of this application;

[0011] Figure 5 is a circuit diagram of a first type of pixel circuit according to some embodiments of this application;

[0012] Figure 6 is a circuit diagram of a second type of pixel circuit according to some embodiments of this application;

[0013] Figure 7 is a circuit diagram of a first type of pixel circuit according to some other embodiments of this application;

[0014] Figure 8 is a circuit diagram of a second type of pixel circuit according to some other embodiments of this application;

[0015] Figure 9 is the driving timing diagram of the second type of pixel circuit shown in Figure 8.

[0016] The attached figures are labeled as follows:

[0017] 100, Display panel; 100a, Display area; SA, Display zone; 100b, Non-display area; CP, Connection point;

[0018] 31, base;

[0019] 32, Driving circuit layer; 321, Pixel circuit; 322, First type pixel circuit; 323, 323a, 323b, 323c, 323d, Second type pixel circuit; 324, Pixel circuit group; T1, Driving transistor; T2, Switching transistor; T3, Light emission control transistor; T4, Sensing transistor; C, Capacitor; 325, Scan line; 326, Light emission control signal line; 327, 327a, 327b, 327c, 327d, Sensing line; 328, Data line;

[0020] 33, Light-emitting device layer; 331, Light-emitting device;

[0021] 34. Thin-film encapsulation layer;

[0022] 40, drive unit; 50, external circuit; 51, external processing circuit;

[0023] Data, data signal; Pscan, scan signal; EM, light emission control signal; VSS, first power supply voltage; VDD, second power supply voltage;

[0024] x, the first direction; y, the second direction. Embodiments of the present invention

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] Figure 1 is a schematic diagram of the planar structure of the display panel of some embodiments of this application.

[0027] As shown in Figure 1, the display panel 100 has a display area 100a and a non-display area 100b surrounding the display area 100a. The display panel 100 includes multiple data lines 328, multiple scan lines 325, multiple light emission control signal lines 326, and external circuitry 50. The external circuitry 50 includes a driving unit 40.

[0028] Multiple scan lines 325 are disposed in the display area 100a, extending along the first direction x and spaced apart along the second direction y.

[0029] Multiple light-emitting control signal lines 326 are disposed in the display area 100a, extending along the first direction x and spaced apart along the second direction y. One light-emitting control signal line 326 may be disposed adjacent to one scan line 325.

[0030] Multiple data lines 328 extend from the display area 100a to the non-display area 100b along the second direction y, and are connected to the driving unit 40 bonded to the non-display area 100b. The multiple data lines 328 are also spaced apart along the first direction x. The multiple data lines 328 intersect insulatedly with multiple scan lines 325 and multiple light-emitting control signal lines 326.

[0031] The drive unit 40 may include a source driver.

[0032] The first direction x intersects the second direction y. In some embodiments, the first direction x and the second direction y may be perpendicular. In other embodiments, the angle between the first direction x and the second direction y may be an acute angle or an obtuse angle.

[0033] Figure 2 is a schematic diagram of the cross-sectional structure taken along the A-A' tangent line in the display panel shown in Figure 1.

[0034] As shown in Figure 2, the display panel 100 includes a substrate 31, a driving circuit layer 32, and a light-emitting device layer 33. The driving circuit layer 32 is disposed on the substrate 31, and the light-emitting device layer 33 is disposed on the side of the driving circuit layer 32 opposite to the substrate 31.

[0035] In some embodiments, substrate 31 may include a glass substrate, which can reduce the manufacturing cost of the display panel. In other embodiments, substrate 31 may also include a flexible substrate, enabling the display panel 100 to be bent. In still other embodiments, substrate 31 may also include a semiconductor substrate such as silicon.

[0036] The light-emitting device layer 33 includes a plurality of light-emitting devices 331. The plurality of light-emitting devices 331 are located in the display area 100a. Each light-emitting device 331 may include an anode, a cathode, and a light-emitting layer located between the anode and the cathode. The plurality of light-emitting devices 331 may share a single cathode. In some embodiments, the light-emitting layer may include an organic light-emitting layer, such that the light-emitting device 331 is an organic light-emitting diode (OLED). The organic light-emitting layer includes organic materials. In other embodiments, the light-emitting layer may also include an inorganic light-emitting layer.

[0037] The display panel 100 may further include a thin-film encapsulation layer 34, which protects the light-emitting device layer 33 and reduces the risk of corrosion of the light-emitting device 331 by oxygen and moisture. The thin-film encapsulation layer 34 is located on the side of the light-emitting device layer 33 facing away from the substrate 31. The thin-film encapsulation layer 34 may include two inorganic thin-film encapsulation layers and an organic thin-film encapsulation layer located between the two inorganic thin-film encapsulation layers.

[0038] In some embodiments, the display panel 100 may further include a functional layer (not shown), which includes at least one of a circular polarizer, a light filter layer, and a touch layer. Some functional layers may be disposed on the side of the thin-film encapsulation layer 34 opposite to the display panel 100. Some functional layers may also be integrated inside the display panel 100 to reduce the thickness of the display panel 100. For example, the touch layer may be integrated inside the display panel 100.

[0039] The driving circuit layer 32 includes multiple data lines 328, multiple scan lines 325, and multiple light emission control signal lines 326.

[0040] Figure 3 is a planar structural diagram of multiple pixel circuits disposed in the display area according to some embodiments of this application, and Figure 4 is a planar structural diagram of multiple pixel circuits disposed in the display area according to other embodiments of this application.

[0041] As shown in Figures 3 and 4, the driving circuit layer 32 also includes multiple pixel circuits 321, which are respectively connected to multiple light-emitting devices 331 to drive the multiple light-emitting devices 331 to emit light, so that the display panel 100 can display images.

[0042] Multiple pixel circuits 321 are located in the display area 100a. The multiple pixel circuits 321 include first type pixel circuits 322 and second type pixel circuits 323 that are different from each other, so as to achieve both high resolution and brightness uniformity of the display panel 100.

[0043] The first type of pixel circuit 322 does not include functional devices for detecting the threshold voltage of its internal transistors, thus reducing the number of functional devices and the area it occupies. With a fixed area of ​​the display area 100a of the display panel 100, the smaller area occupied by the first type of pixel circuit 322 allows for more pixel circuits 321 to be installed in the display area 100a, meeting the high resolution requirements of the display panel 100. The second type of pixel circuit 323 includes functional devices for detecting the threshold voltage of its internal transistors. A compensation value for the threshold voltage is calculated using the detected threshold voltage, and coarse compensation is applied to the threshold voltages of the transistors in both the first and second type of pixel circuits based on this compensation value, thereby meeting the display panel 100's requirement for good brightness uniformity.

[0044] It should be noted that although Figures 3 and 4 show the first type of pixel circuit 322 and the second type of pixel circuit 323 spaced apart, this is only to illustrate the arrangement design of the first type of pixel circuit 322 and the second type of pixel circuit 323. The second type of pixel circuit 323 can be arranged adjacent to and continuously with the second type of pixel circuit 323.

[0045] Figure 5 is a circuit diagram of a first type of pixel circuit according to some embodiments of this application, and Figure 6 is a circuit diagram of a second type of pixel circuit according to some embodiments of this application.

[0046] As shown in Figures 5 and 6, each of the first type of pixel circuit 322 and the second type of pixel circuit 323 includes a driving transistor T1.

[0047] As shown in Figures 3, 4, and 6, the display panel 100 also includes a sensing line 327. The sensing line 327 is connected to the driving transistor T1 of the second type pixel circuit 323 to receive the electrical signal output by the driving transistor T1 when it is turned on in the second type pixel circuit 323. The external circuit 50 is connected to the sensing line 327 and is configured to acquire the electrical signal.

[0048] The second-type pixel circuit 323, sensing line 327, and external circuit 50 work together to detect the electrical signal corresponding to the threshold voltage of the driving transistor T1 of the second-type pixel circuit 323, while the first-type pixel circuit 322 does not have the function of detecting electrical signals. The external circuit 50 can obtain the compensation value of the threshold voltage of the driving transistor T1 in the second-type pixel circuit 323 based on the electrical signal, and use the compensation value to compensate the threshold voltage of the driving transistor T1 of both the first-type pixel circuit 322 and the second-type pixel circuit 323, thereby improving the brightness uniformity of the display panel 100. Simultaneously, the first-type pixel circuit 322 does not have the function of detecting electrical signals, resulting in a smaller number of transistors in the first-type pixel circuit 322 and a smaller layout area occupied by the first-type pixel circuit 322. This facilitates increasing the number of pixel circuits, enabling the display panel and display device to achieve high-resolution display. In other words, the hybrid design of the first-type pixel circuit 322 and the second-type pixel circuit 323 can balance the high resolution and brightness uniformity of the display panel.

[0049] As shown in Figures 5 and 6, in some embodiments, each of the first type pixel circuit 322 and the second type pixel circuit 323 further includes a switching transistor T2. The second type pixel circuit 323 also includes a sensing transistor T4, while the first type pixel circuit 322 does not include a sensing transistor T4. Thus, the first type pixel circuit 322 does not include a transistor for detecting the threshold voltage of the driving transistor T1 in the first type pixel circuit 322, while the second type pixel circuit 323 includes a transistor for detecting the threshold voltage of the driving transistor T1 in the second type pixel circuit 323, and the number of transistors in the first type pixel circuit 322 is less than the number of transistors in the second type pixel circuit 323.

[0050] The cathode of each light-emitting device 331 receives a first power supply voltage VSS. The first power supply voltage VSS can be a low-level voltage.

[0051] In the first type of pixel circuit 322 and the second type of pixel circuit 323, when the driving transistor T1 is turned on, it generates a driving current to drive the light-emitting device 331 to emit light. The driving transistor T1 includes a gate, a first electrode, and a second electrode. The first electrode of the driving transistor T1 is connected to the anode of the light-emitting device 331. The second electrode of the driving transistor T1 receives a second power supply voltage VDD. The second power supply voltage VDD is different from the first power supply voltage VSS. For example, the second power supply voltage VDD can be greater than the first power supply voltage VSS, and the second power supply voltage VDD can be a high-level voltage.

[0052] In this application, the first electrode is one of the source and the drain, and the second electrode is the other of the source and the drain.

[0053] In the first type pixel circuit 322 and the second type pixel circuit 323, the switching transistor T2 controls the data signal Data transmitted via the data line 328 to be transmitted to the gate of the driving transistor T1. The switching transistor T2 includes a first terminal, a second terminal, and a gate. The first terminal of the switching transistor T2 receives the data signal Data. The second terminal of the switching transistor T2 is connected to the gate of the driving transistor T1. The gate of the switching transistor T2 receives the scan signal Pscan transmitted via the scan line 325.

[0054] In the second type of pixel circuit 323, sensing transistor T4 senses the current or voltage output from its first terminal when driving transistor T1 is turned on. Sensing transistor T4 includes a first terminal and a second terminal. The first terminal of sensing transistor T4 is connected to the first terminal of driving transistor T1. The second terminal of sensing transistor T4 is connected to sensing line 327. Sensing line 327 is connected to external circuit 50. Thus, the second type of pixel circuit 323 is a pixel circuit capable of externally compensating for the threshold voltage. Compared to pixel circuits that achieve internal compensation for the threshold voltage, such as the 7T1C pixel circuit (which includes 7 transistors and a capacitor), the second type of pixel circuit 323 has fewer transistors, which is more advantageous for achieving high resolution.

[0055] In some embodiments, as shown in Figures 5 and 6, each of the first type pixel circuit 322 and the second type pixel circuit 323 further includes a capacitor C. The capacitor C is connected between the first terminal of the driving transistor T1 and the gate of the driving transistor T1. Thus, when the driving transistor T1 is turned on, the capacitor C ensures that the driving transistor T1 can stably drive the light-emitting device 331 to emit light.

[0056] As shown in Figures 1, 3, and 4, the external circuit 50 may further include an external processing circuit 51 connected to the driving unit 40. The external processing circuit 51 receives the electrical signal (sensing current or sensing voltage) when the driving transistor T1 in the second type pixel circuit 323 is turned on via the sensing line 327. After converting the electrical signal from an analog signal to a digital signal, it performs calculations to obtain the threshold voltage of the driving transistor T1 or a compensation value for the threshold voltage of the driving transistor T1. Next, the storage unit (not shown) in the external processing circuit 51 stores the threshold voltage or compensation value. Then, the threshold voltage or compensation value is converted from a digital signal to an analog signal and transmitted to the driving unit 40. The driving unit 40 performs refined compensation on the threshold voltage of the driving transistor T1 in the first type pixel circuit 322 and the second type pixel circuit 323 based on one of the corresponding analog signals and the brightness curve, thereby improving the brightness uniformity of the display panel 100. The brightness curve is obtained by acquiring the display screen during display and calculating the brightness difference of the display panel. The acquisition of the brightness curve is a conventional technique and will not be described in detail here.

[0057] In some embodiments, the external processing circuit 51 may include an analog-to-digital conversion circuit (not shown), a computing unit (not shown), a storage unit (not shown), and a digital-to-analog conversion circuit (not shown).

[0058] The analog-to-digital conversion circuit receives the electrical signal (sensing current or sensing voltage) when the driving transistor T1 in the second type of pixel circuit 323 is turned on through the sensing line 327, and converts the electrical signal into a digital signal.

[0059] The computing unit receives the digital signal output from the analog-to-digital converter circuit and calculates the threshold voltage of the driving transistor T1 or the compensation value of the threshold voltage of the driving transistor T1 based on a preset dataset and the digital signal. The preset dataset may include data corresponding to the mapping relationship between a preset electrical signal and a preset threshold voltage, or the preset dataset may include data corresponding to the mapping relationship between a preset electrical signal and a preset compensation value.

[0060] The storage unit receives the threshold voltage or compensation value calculated by the computing unit.

[0061] The digital-to-analog converter circuit receives the threshold voltage or compensation value and converts it into an analog signal, which is then output to the drive unit 40.

[0062] The first type of pixel circuit 322 shown in Figure 5 includes two transistors and one capacitor. This first type of pixel circuit 322 has a smaller number of transistors, which meets the requirements for high resolution. The second type of pixel circuit 323 shown in Figure 6 includes three transistors and one capacitor. This smaller number of transistors also meets the requirements for high resolution, while simultaneously enabling external compensation of the threshold voltage. The hybrid design of the first type of pixel circuit 322 shown in Figure 5 and the second type of pixel circuit 323 shown in Figure 6, while accommodating external compensation of the threshold voltage of the driving transistor T1, allows for more space in the display panel 100 to accommodate the pixel circuit 321, thereby achieving high resolution.

[0063] In related technologies, display panels typically use a single type of pixel circuit, making it difficult to simultaneously achieve high resolution and threshold voltage compensation. For example, glass-based organic light-emitting diode (OLED) display panels often employ 7T1C pixel circuits with internal compensation capabilities, which can achieve threshold voltage compensation and thus improve brightness uniformity. However, the large number of transistors in this pixel circuit makes it difficult to achieve a pixel density of 1500 pixels per inch or higher.

[0064] In some embodiments, for the first type pixel circuit 322 and the second type pixel circuit 323 shown in FIG5 and FIG6, the second power supply voltage VDD and the first power supply voltage VSS can both be fixed power supply voltage signals, that is, the second power supply voltage VDD and the first power supply voltage VSS are both constant.

[0065] In other embodiments, for the first type pixel circuit 322 and the second type pixel circuit 323 shown in Figures 5 and 6, at least one of the second power supply voltage VDD and the first power supply voltage VSS can be varied, so that the difference between the second power supply voltage VDD and the first power supply voltage VSS can vary. Different differences can control whether the driving transistor T1 is turned on. When the driving transistor T1 is turned on, the light-emitting device 331 emits light, and the display panel displays an image of a certain brightness. When the driving transistor T1 is turned off, the display panel displays a black image, that is, the display panel has a black pixel insertion function. Therefore, through the hybrid design of the first type pixel circuit 322 shown in Figure 5 and the second type pixel circuit 323 shown in Figure 6, the high resolution of the display panel, external compensation of the threshold voltage, and the black pixel insertion function can be simultaneously achieved.

[0066] In other embodiments, when the driving transistor T1 is turned on, the difference between the second power supply voltage VDD and the first power supply voltage VSS is a first difference. When the driving transistor T1 is turned off, the difference between the second power supply voltage VDD and the first power supply voltage VSS is a second difference, which is different from the first difference.

[0067] In some embodiments, the sensing transistor T4 further includes a gate, which receives the scan signal Pscan transmitted by the scan line 325. Thus, in each second-type pixel circuit 323, the gate of the sensing transistor T4 and the gate of the switching transistor T2 can be connected to a scan line 325 that transmits the scan signal Pscan, reducing the number of scan lines and providing more space to arrange the pixel circuits 321, further improving the resolution of the display panel 100. Furthermore, in the extension direction of the scan line 325, the gates of the switching transistors T2 of the first-type pixel circuit 322 and the second-type pixel circuit 323 can also be connected to a scan line 325 that transmits the scan signal Pscan, further reducing the number of scan lines, providing more space to arrange the pixel circuits 321, and further improving the resolution of the display panel 100.

[0068] In other embodiments, in the second type of pixel circuit 323, the gate of sensing transistor T4 and the gate of switching transistor T2 can also receive two different scan signals respectively. Thus, sensing transistor T4 and switching transistor T2 are controlled by different scan signals, and can be controlled independently, thereby better realizing the writing of data signal Data and the detection of threshold voltage.

[0069] Figure 7 is a circuit diagram of a first type of pixel circuit according to some other embodiments of this application, and Figure 8 is a circuit diagram of a second type of pixel circuit according to some other embodiments of this application.

[0070] In some other embodiments, the first type of pixel circuit shown in FIG7 is basically similar to the first type of pixel circuit shown in FIG5, and the second type of pixel circuit shown in FIG8 is basically similar to the second type of pixel circuit shown in FIG6. The similarities will not be repeated. The differences include that each of the first type of pixel circuit 322 shown in FIG7 and the second type of pixel circuit 323 shown in FIG8 further includes a light-emitting control transistor T3. The light-emitting control transistor T3 is used to control the light-emitting time of the light-emitting device 331. When the light-emitting control transistor T3 is turned on, the light-emitting device 331 emits light, and the display panel 100 displays an image of a certain brightness. When the light-emitting control transistor T3 is turned off, the light-emitting device 331 does not emit light, and the display panel 100 displays a black image; that is, the display panel 100 has a black screen insertion function.

[0071] In the first type of pixel circuit 322 shown in Figure 7 and the second type of pixel circuit 323 shown in Figure 8, the second power supply voltage VDD and the first power supply voltage VSS can both be fixed power supply voltage signals.

[0072] In some embodiments, the light-emitting control transistor T3 may include a gate, a first electrode, and a second electrode. The gate of the light-emitting control transistor T3 receives the light-emitting control signal EM transmitted by the light-emitting control signal line 326. The first electrode of the light-emitting control transistor T3 receives the second power supply voltage VDD. The second electrode of the light-emitting control transistor T3 is connected to the second electrode of the driving transistor T1. Thus, the first and second electrodes of the light-emitting control transistor T3 are connected between the second electrode of the driving transistor T1 and the power supply signal line transmitting the second power supply voltage VDD, reducing the power consumption of the first pixel circuit 322 and the second pixel circuit 321 during operation.

[0073] Figure 7 shows a first-type pixel circuit 322, which includes three transistors and a capacitor C. This first-type pixel circuit 322 has a smaller number of transistors, meeting the requirements for high resolution and also satisfying the black pixel insertion function of the display panel. Figure 8 shows a second-type pixel circuit 323, which includes four transistors and a capacitor C. This second-type pixel circuit 323 can simultaneously detect the threshold voltage of the driving transistor T1, satisfying the black pixel insertion function of the display panel. Thus, the hybrid design of the first-type pixel circuit 322 and the second-type pixel circuit 323 balances external compensation for the threshold voltage of the driving transistor T1 and the black pixel insertion function of the display panel 100, while providing more space in the display panel 100 to accommodate the pixel circuit 321, thereby achieving high resolution.

[0074] For the first type pixel circuit 322 and the second type pixel circuit 323 shown in Figures 7 and 8, a sensing transistor T4 is added to the second type pixel circuit 323, and a light-emitting control transistor T3 is added to both the first type pixel circuit 322 and the second type pixel circuit, so as to improve the resolution of the display panel 100 while realizing the external compensation of the threshold voltage and the black insertion function.

[0075] Furthermore, as can be seen from Figures 5 to 8, the second type of pixel circuit 323 has the function of supporting the detection of electrical signals corresponding to the threshold voltage, while the first type of pixel circuit 322 does not have the function of supporting the detection of electrical signals corresponding to the threshold voltage. The number of transistors in the first type of pixel circuit 322 is less than the number of transistors in the second type of pixel circuit 323, and the number of transistors in the second type of pixel circuit 323 is less than or equal to 4. This ensures that the display panel 100 can achieve external compensation of the threshold voltage of the pixel circuit to improve the brightness uniformity of the display panel, while also improving the resolution of the display panel.

[0076] It is understandable that, based on other functional requirements of the display panel 100, additional transistors can be added to the first type of pixel circuit 322 and the second type of pixel circuit 323. For example, an initialization transistor can be added to initialize the gate of the driving transistor T1, or a reset transistor can be added to initialize the anode of the light-emitting device 331. Of course, adding transistors will affect the resolution of the display panel 100 to some extent. In some embodiments, the layout area occupied by one first type of pixel circuit 322 is smaller than the layout area occupied by one second type of pixel circuit 323. Thus, the layout area occupied by the first type of pixel circuit 322 is smaller, providing more space to arrange more pixel circuits 321, thereby improving the resolution of the display panel 100.

[0077] It should be noted that the area occupied by the first type of pixel circuit 322 is equal to the orthographic projection area of ​​the first type of pixel circuit 322 on the substrate 31, and the area occupied by the second type of pixel circuit 323 is equal to the orthographic projection area of ​​the second type of pixel circuit 323 on the substrate 31. The orthographic projection area of ​​the first type of pixel circuit 322 on the substrate 31 can be equal to the sum of the orthographic projection areas of the multiple transistors, capacitors C, and the traces connecting the multiple transistors and capacitors C in the first type of pixel circuit 322 on the substrate 31. The orthographic projection area of ​​the second type of pixel circuit 323 on the substrate 31 is similar and will not be elaborated here.

[0078] As mentioned above, the first type of pixel circuit 322 does not include the sensing transistor T4, while the second type of pixel circuit 323 includes the sensing transistor T4. This makes the number of transistors in the first type of pixel circuit 322 less than the number of transistors in the second type of pixel circuit 323, which is beneficial because the layout area occupied by a first type of pixel circuit 322 is less than the layout area occupied by a second type of pixel circuit 323.

[0079] In some embodiments, the number of first-type pixel circuits 322 in the display area 100a is greater than the number of second-type pixel circuits 323. Thus, the smaller number of second-type pixel circuits 323 with a larger area is used to detect the threshold voltage of the driving transistor T1 to achieve external compensation of the threshold voltage, giving the display panel 100 good brightness uniformity. Simultaneously, the larger number of first-type pixel circuits 322 with a smaller area can increase the number of pixel circuits 321, giving the display panel 100 high resolution.

[0080] For the pixel circuits shown in Figures 5 to 8, in some embodiments, the driving transistor T1 in the first type of pixel circuit 322 is the same as the driving transistor T1 in the second type of pixel circuit 323; and / or, the switching transistor T2 in the first type of pixel circuit 322 is the same as the switching transistor T2 in the second type of pixel circuit 323; and / or, the light-emitting control transistor T3 in the first type of pixel circuit 322 is the same as the light-emitting control transistor T3 in the second type of pixel circuit 323. Thus, at least one transistor in the first type of pixel circuit 322 is the same as the corresponding transistor in the second type of pixel circuit 323, and the transistors in the first type of pixel circuit 322 and the second type of pixel circuit 323 are fabricated using the same process technology, simplifying the manufacturing process of the display panel 100.

[0081] In one specific embodiment, the driving transistor T1 in the first type of pixel circuit 322 is the same as the driving transistor T1 in the second type of pixel circuit 323, the switching transistor T2 in the first type of pixel circuit 322 is the same as the switching transistor T2 in the second type of pixel circuit 323, and the light-emitting control transistor T3 in the first type of pixel circuit 322 is the same as the light-emitting control transistor T3 in the second type of pixel circuit 323. This further simplifies the manufacturing process of the display panel 100. Furthermore, since the driving transistor T1 in the first type of pixel circuit 322 is the same as the driving transistor T1 in the second type of pixel circuit 323, using the detected threshold voltage or compensation value of the driving transistor T1 in the second type of pixel circuit 323 can better compensate for the threshold voltage of the driving transistor T1 in the first type of pixel circuit 322, thereby improving the uniformity of display brightness.

[0082] It should be noted that the fact that the driving transistor T1 in the first type of pixel circuit 322 is the same as the driving transistor T1 in the second type of pixel circuit 323 means that the driving transistor T1 in the first type of pixel circuit 322 and the driving transistor T1 in the second type of pixel circuit 323 are the same in type and size. For example, the driving transistor T1 in the first type of pixel circuit 322 and the driving transistor T1 in the second type of pixel circuit 323 can both be N-type low-temperature polysilicon transistors, and their dimensions are basically the same. The fact that their dimensions are basically the same takes into account the differences caused by manufacturing processes. The switching transistor T2 in the first type of pixel circuit 322 is the same as the switching transistor T2 in the second type of pixel circuit 323, the light-emitting control transistor T3 in the first type of pixel circuit 322 is the same as the light-emitting control transistor T3 in the second type of pixel circuit 323, and so on, will not be elaborated further here.

[0083] In another specific embodiment, the two transistors in the first type of pixel circuit 322 may be the same as the corresponding two transistors in the second type of pixel circuit 323, or one transistor in the first type of pixel circuit 322 may be the same as the corresponding one transistor in the second type of pixel circuit 323.

[0084] For the pixel circuits shown in Figures 5 to 8, in some embodiments, the driving transistor T1 in the first type of pixel circuit 322 and the driving transistor T1 in the second type of pixel circuit 323 both include low-temperature polysilicon transistors (LTPS); and / or, the switching transistor T2 in the first type of pixel circuit 322 and the switching transistor T2 in the second type of pixel circuit 323 both include LPS; and / or, the light-emitting control transistor T3 in the first type of pixel circuit 322 and the light-emitting control transistor T3 in the second type of pixel circuit 323 both include LPS; and / or, the sensing transistor T4 includes a LPS. Thus, at least one transistor in the first type of pixel circuit 322 and at least one transistor in the second type of pixel circuit 323 are LPS with a smaller footprint, further reducing the footprint of a single pixel circuit 321, which is beneficial for increasing the number of pixel circuits 321, enabling the display panel 100 to achieve high resolution.

[0085] In one specific embodiment, the driving transistor T1 in the first type of pixel circuit 322 and the driving transistor T1 in the second type of pixel circuit 323 both include low-temperature polysilicon transistors (LTPS). Similarly, the switching transistor T2 in the first type of pixel circuit 322 and the switching transistor T2 in the second type of pixel circuit 323 both include LPS. The light-emitting control transistor T3 in the first type of pixel circuit 322 and the light-emitting control transistor T3 in the second type of pixel circuit 323 both include LPS. The sensing transistor T4 also includes a LPS. This further reduces the area occupied by a single pixel circuit 321, which is beneficial for increasing the number of pixel circuits 321, enabling the display panel 100 to achieve high resolution.

[0086] In some embodiments, at least one of the driving transistor T1 in the first type of pixel circuit 322 and the driving transistor T1 in the second type of pixel circuit 323 may also include a metal-oxide-semiconductor (MOD) transistor. In some embodiments, at least one of the switching transistor T2 in the first type of pixel circuit 322 and the switching transistor T2 in the second type of pixel circuit 323 may also include a MOD transistor. In some embodiments, at least one of the light-emitting control transistor T3 in the first type of pixel circuit 322 and the light-emitting control transistor T3 in the second type of pixel circuit 323 may also include a MOD transistor. In some embodiments, the sensing transistor T4 may also include a MOD transistor.

[0087] For the pixel circuits shown in Figures 5 to 8, in some embodiments, the driving transistor T1 in the first type pixel circuit 322 and the driving transistor T1 in the second type pixel circuit 323 are N-type transistors; and / or, the switching transistor T2 in the first type pixel circuit 322 and the switching transistor T2 in the second type pixel circuit 323 are P-type transistors; and / or, the light-emitting control transistor T3 in the first type pixel circuit 322 and the light-emitting control transistor T3 in the second type pixel circuit 323 are P-type transistors; and / or, the sensing transistor T4 in the second type pixel circuit 323 is a P-type transistor.

[0088] In one specific embodiment, the driving transistor T1 in the first type of pixel circuit 322 and the driving transistor T1 in the second type of pixel circuit 323 are both N-type transistors. This facilitates the detection and compensation of the threshold voltage of the driving transistor T1.

[0089] In one specific embodiment, the switching transistor T2 in the first type pixel circuit 322 and the switching transistor T2 in the second type pixel circuit 323 are P-type transistors. The light-emitting control transistor T3 in the first type pixel circuit 322 and the light-emitting control transistor T3 in the second type pixel circuit 323 are also P-type transistors. The sensing transistor T4 in the second type pixel circuit 323 is a P-type transistor. This reduces the driving power consumption of the switching transistor T2, the light-emitting control transistor T3, and the sensing transistor T4.

[0090] In some embodiments, as shown in Figures 3 and 4, the plurality of pixel circuits 321 are divided into a plurality of pixel circuit groups 324 arranged in an array. Each pixel circuit group 324 includes at least one second-type pixel circuit 323 and a plurality of first-type pixel circuits 322. The display area 100a of the display panel 100 is divided into a plurality of display partitions SA arranged in an array, and each display partition SA is provided with one pixel circuit group 324. Thus, based on the combination of first-type pixel circuits 322 and second-type pixel circuits 323, a pixel circuit group 324 can serve as a minimum threshold voltage compensation unit to achieve coarse compensation of the threshold voltage and improve the brightness uniformity of the display partition SA.

[0091] A pixel circuit group 324 as the smallest threshold voltage compensation unit means that, based on the electrical signal corresponding to the threshold voltage of the driving transistor T1 detected by at least one second-type pixel circuit 323 in a pixel circuit group 324, threshold voltage compensation is performed on the driving transistor T1 of multiple first-type pixel circuits 322 and at least one second-type pixel circuit 323 in a pixel circuit group 324.

[0092] It should be noted that the pixel circuit group 324 is arranged in the display area 100a as the smallest repeating unit of the pixel driving circuit. Furthermore, in the display area 100a, the more pixel circuit groups 324 there are, the fewer pixel circuits 321 are in each pixel circuit group 324, the more refined the threshold voltage compensation can be achieved in each pixel circuit group 324, and the better the brightness uniformity of the display zone SA corresponding to the pixel circuit group 324 will be.

[0093] In some embodiments, in a pixel circuit group 324, the number of second-type pixel circuits 323 is less than the number of first-type pixel circuits 322. Thus, based on the smaller number of second-type pixel circuits 323, electrical signals can be detected, and threshold voltage compensation of the driving transistors T1 of the multiple pixel circuits in the pixel circuit group 324 can be achieved based on the electrical signals. Simultaneously, the resolution of the display panel 100 is improved based on the larger number of first-type pixel circuits 322.

[0094] In some embodiments, the plurality of pixel circuit groups 324 may be arranged in a two-dimensional array in the display area 100a, for example, extending along the extension direction of the data line 328 (second direction y) and the extension direction of the scan line 325 (first direction x), to simplify the design of the wiring connected to the pixel circuit 321. When the plurality of pixel circuit groups 324 are arranged in a two-dimensional array, the plurality of display partitions SA corresponding to the plurality of pixel circuit groups 324 may also be arranged in a two-dimensional array.

[0095] In other embodiments, the plurality of pixel circuits 321 may also be arranged in a one-dimensional array, for example, extending along the extension direction of the data line 328 or the extension direction of the scan line 325. When the plurality of pixel circuit groups 324 are arranged in a one-dimensional array, the plurality of display partitions SA corresponding to the plurality of pixel circuit groups 324 may also be arranged in a one-dimensional array.

[0096] In a pixel circuit group 324, the number of second-type pixel circuits 323 affects the resolution and threshold voltage compensation effect of the display panel 100. Specifically, the more second-type pixel circuits 323 in a pixel circuit group 324, the more electrical signals corresponding to the sensed threshold voltage can be detected, and more accurate compensation can be achieved based on the electrical signals corresponding to multiple threshold voltages. However, a large number of second-type pixel circuits 323 is not conducive to reducing the layout area occupied by a pixel circuit group 324, which is detrimental to improving the resolution of the display panel 100. Furthermore, the position of the second-type pixel circuits 323 in a pixel circuit group 324 also affects the threshold voltage compensation effect. Specifically, the process technology at different positions is different, resulting in differences in the threshold voltage of the driving transistor T1 of the second-type pixel circuits 323 at different positions. Based on this, some embodiments of this application optimize the number and position of the second-type pixel circuits 323 in a pixel circuit group 324.

[0097] In some embodiments, within a pixel circuit group 324, a second type pixel circuit 323 is disposed between two adjacent first type pixel circuits 322. Thus, the effect of process differences on the threshold voltage of the driving transistor T1 of the second type pixel circuit 323 is the same as or nearly the same as the effect of process differences on the threshold voltage of the driving transistor T1 of the two adjacent first type pixel circuits 322. When the threshold voltage of the driving transistor T1 of the two adjacent first type pixel circuits 322 is compensated using the electrical signal corresponding to the threshold voltage sensed by the second type pixel circuit 323, a better threshold voltage compensation effect can be obtained, resulting in better brightness uniformity of the display partition SA corresponding to the pixel circuit group 324.

[0098] In a specific embodiment, as shown in Figures 3 and 4, in a pixel circuit group 324, multiple first-type pixel circuits 322 are arranged around a second-type pixel circuit 323. Thus, the threshold voltage of the driving transistor T1 in the second-type pixel circuit 323 tends to be the same as the threshold voltage of the driving transistors T1 of the multiple first-type pixel circuits 322 surrounding the second-type pixel circuit 323. Based on the electrical signal corresponding to the threshold voltage detected by the second-type pixel circuit 323, compensation of the threshold voltages of the driving transistors T1 of the multiple first-type pixel circuits 322 can be achieved, reducing the area occupied by the pixel circuit group 324 and simultaneously reducing the number of electrical signals corresponding to the threshold voltages that need to be sensed. This simplifies the structure of the external processing circuit 51 connected to the sensing line 327, thereby simplifying the manufacturing process of the display panel 100.

[0099] In some embodiments, as shown in Figures 3 and 4, only one type of second-class pixel circuit 323 may be provided in a pixel circuit group 324. Thus, the number of second-class pixel circuits 323 in a pixel circuit group 324 is minimized, while the number of first-class pixel circuits 322 is maximized. This reduces the layout area occupied by a pixel circuit group 324, allowing for the provision of more pixel circuit groups 324 to improve resolution while simplifying the threshold voltage compensation method for pixel circuits 321 within the pixel circuit group 324.

[0100] In other embodiments, two or more second-type pixel circuits 323 may be provided in a pixel circuit group 324. Based on the electrical signals corresponding to the threshold voltages of the driving transistors T1 of the two or more second-type pixel circuits 323, more accurate compensation values ​​can be obtained, external compensation of the threshold voltage can be better achieved, and the brightness uniformity of the display zone SA in which the pixel circuit group 324 is located can be better improved.

[0101] In some embodiments, the second type of pixel circuits 323 in at least two pixel circuit groups 324 are arranged in the same position to simplify the manufacturing process of multiple pixel circuit groups 324 and simplify the arrangement of sensing lines 327.

[0102] Optionally, in the extension direction of the data line 328, the second type of pixel circuits 323 in at least two pixel circuit groups 324 are arranged in the same position. This simplifies the manufacturing process of multiple pixel circuit groups 324 and also facilitates the connection of the second type of pixel circuits 323 in at least two pixel circuit groups 324 with a sensing line 327 in the extension direction of the data line 328, thereby reducing the number of sensing lines 327, providing more space for pixel circuits, and thus improving the resolution of the display panel 100.

[0103] Optionally, in the extension direction of the scan line 325, the second type of pixel circuit 323 in at least two pixel circuit groups 324 are arranged in the same position to simplify the manufacturing process of multiple pixel circuit groups 324.

[0104] For example, as shown in Figures 3 and 4, in the extension direction of the data line 328 and the extension direction of the scan line 325, the second type of pixel circuit 323 in the plurality of pixel circuit groups 324 is located in the middle position of each pixel circuit group 324.

[0105] It is understandable that the second type of pixel circuit 323 in the pixel circuit group 324 can also be located in other positions in each pixel circuit group 324 besides the middle position, such as the edge position of the display partition SA.

[0106] In addition, when there are two or more second-type pixel circuits 323 in each pixel circuit group 324, the positions of the second-type pixel circuits 323 in multiple pixel circuit groups 324 can also be the same.

[0107] In other embodiments, the arrangement positions of the second type of pixel circuits 323 in at least two pixel circuit groups 324 may be different, so that the arrangement positions of the multiple second type of pixel circuits 323 in the display area 100a are disordered. Based on the multiple electrical signals detected by the second type of pixel circuits 323 at different positions in at least two pixel circuit groups 324, the threshold voltage of the driving transistor T1 of the pixel circuit in at least two pixel circuit groups 324 is compensated, which can make the brightness uniformity of the display area 100a better.

[0108] Optionally, in the extension direction of the data line 328 and / or in the extension direction of the scan line 325, the second type of pixel circuits 323 in at least two pixel circuit groups 324 are misaligned.

[0109] For example, in the extension direction of the scan line 325, the second type of pixel circuits 323 in at least two pixel circuit groups 324 are misaligned.

[0110] In some embodiments, as shown in FIG3, in the extension direction of the data line 328, i.e., in the second direction y, the sensing transistors T4 of at least two second-type pixel circuits 323 in adjacent pixel circuit groups 324 are aligned and connected to a sensing line 327. Thus, in the extension direction of the data line 328, the sensing transistors T4 aligned in adjacent pixel circuit groups 324 can share a single sensing line 327, reducing the number of sensing lines 327, decreasing the area occupied by the sensing lines 327, and allowing more space to be used for more pixel circuits 321, further improving the resolution of the display panel 100. For example, in the extension direction of the data line 328, the sensing transistors T4 of four second-type pixel circuits 323 in four adjacent pixel circuit groups 324 are aligned and connected to a single sensing line 327. In other embodiments, as shown in FIG4, in the extension direction of the data line 328, the sensing transistors T4 of at least two second-type pixel circuits 323 in adjacent pixel circuit groups 324 are aligned and connected to at least two different sensing lines 327. Thus, in the extension direction of the data line 328, for the sensing transistors T4 respectively located in adjacent pixel circuit groups 324 and aligned, different sensing lines 327 can be used to independently acquire the electrical signal when the driving transistor T1 is turned on. For example, in the extension direction of the data line 328, the sensing transistors T4 of the four second-type pixel circuits 323 of the four adjacent pixel circuit groups 324 (second-type pixel circuits 323a, 323b, 323c, and 323d) are respectively connected to four different sensing lines 327 (sensing lines 327a, 327b, 327c, and 327d).

[0111] In some embodiments, as shown in Figures 3 and 4, the sensing transistors T4 of at least two second-type pixel circuits 323 located in adjacent pixel circuit groups 324 are aligned in the extension direction of the scan line 325, i.e., in the first direction x.

[0112] In some embodiments, as shown in Figures 3 and 4, a first type pixel circuit 322 is disposed between two second type pixel circuits 323 in adjacent pixel circuit groups 324. Exemplarily, a first type pixel circuit 322 is disposed between two second type pixel circuits 323 in adjacent pixel circuit groups 324 in both the extension direction of the data line 328 and the extension direction of the scan line 325.

[0113] In other embodiments, two second-type pixel circuits 323 located in adjacent pixel circuit groups 324 may be arranged adjacently. Exemplarily, two second-type pixel circuits 323 located in adjacent pixel circuit groups 324 are arranged adjacently along the edges of adjacent display partitions SA. It should be noted that the connection point CP in Figures 3 and 4 indicates that the sensing line 327 is connected to the sensing transistor T4.

[0114] The following describes the operation of the second type of pixel circuit 323 in conjunction with the driving timing of the second type of pixel circuit 323.

[0115] Figure 9 is a timing diagram of the driving of the second type of pixel circuit shown in Figure 8. The operation of the second type of pixel circuit 323 includes the external detection period t1 of the threshold voltage, the data voltage writing period t2, and the light emission period t3.

[0116] During the external detection period t1 of the threshold voltage, the light emission control signal EM is at a low level, the scan signal Pscan is at a low level, the data signal Data is a reference voltage, and the first power supply voltage VSS and the second power supply voltage VSS are different constant voltages. The driving transistor T1, the switching transistor T2, the light emission control transistor T3, and the sensing transistor T4 are all turned on. The sensing line 327 outputs the sensing current from the first terminal of the driving transistor T1 to the external processing circuit 51. The external processing circuit 51 calculates the threshold voltage of the driving transistor T1 based on this sensing current. Then, the driving unit 40 obtains the compensation value of the threshold voltage based on the threshold voltage of the driving transistor T1 and the brightness curve.

[0117] During the data voltage writing period t2, the light emission control signal EM is at a high level, the scan signal Pscan is at a low level, and the data signal Data is the compensation data voltage, which is obtained based on the compensation value and the original data voltage. Switching transistor T2 is turned on, light emission control transistor T3 is turned off, driving transistor T1 is turned off, and the compensation data voltage is written to the gate of driving transistor T1.

[0118] During the light-emitting period t3, the light-emitting control signal EM is at a low level, the scan signal Pscan is at a high level, and the data signal Data is at a low level. Switching transistor T2 and sensing transistor T4 are off, while light-emitting control transistor T3 and driving transistor T1 are on, and the light-emitting device 331 emits light.

[0119] In some embodiments, the external detection period t1 of the threshold voltage can be before the frame display period (including the data voltage writing period t2 and the emission period t3). Based on a single detected threshold voltage, the compensation value corresponding to the threshold voltage can be compensated during the data voltage writing period t2 of multiple frames.

[0120] It should be noted that the operation of the first type of pixel circuit 322 is basically similar to that of the second type of pixel circuit 323. The similarities include that the operation of the first type of pixel circuit 322 also includes a data voltage writing period t2 and a light emission period t3. The data voltage writing period t2 and the light emission period t3 of the first type of pixel circuit 322 can be found in the description of the corresponding periods in the second type of pixel circuit 323, and will not be repeated here. The differences include that the operation of the first type of pixel circuit 322 does not include the aforementioned external detection period t1 of the threshold voltage. Based on the same inventive concept, this application also provides a display device, which includes the aforementioned display panel 100. The display device can be applied to virtual reality products, televisions, watches, mobile phones, tablet computers, and other electronic devices.

[0121] In summary, in some embodiments of the display panel and display device of this application, the plurality of pixel circuits include a first type of pixel circuit and a second type of pixel circuit. The second type of pixel circuit includes a sensing transistor capable of detecting the threshold voltage of a transistor, while the first type of pixel circuit does not include the sensing transistor. Using the detected threshold voltage, threshold voltage compensation can be performed on the first type of pixel circuit and the second type of pixel circuit, thereby improving the brightness uniformity of the display panel. Simultaneously, the first type of pixel circuit does not include the sensing transistor, resulting in a smaller number of transistors in the first type of pixel circuit and a smaller layout area occupied by the first type of pixel circuit. Increasing the number of pixel circuits allows the display panel and display device to achieve high-resolution display. In other words, the hybrid design of the first type of pixel circuit and the second type of pixel circuit can balance the high resolution and brightness uniformity of the display panel and display device.

[0122] The above description of the embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application; those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A display panel, wherein, The display panel has a display area, and comprises: a plurality of light emitting devices located in the display area; and a plurality of pixel circuits located in the display area and comprising a first type of pixel circuit and a second type of pixel circuit to which the plurality of light emitting devices are connected, each of the first type of pixel circuit and the second type of pixel circuit comprising a driving transistor; a sensing line connected to the driving transistor of the second type of pixel circuit to receive an electrical signal output by the driving transistor turned on in the second type of pixel circuit; and an external circuit connected to the sensing line and configured to acquire the electrical signal.

2. The display panel of claim 1, wherein, The number of transistors in the first type of pixel circuit is less than the number of transistors in the second type of pixel circuit, and the number of transistors in the second type of pixel circuit is less than or equal to 4.

3. The display panel of claim 1, wherein, The layout area occupied by one of the first type of pixel circuit is less than the layout area occupied by one of the second type of pixel circuit.

4. The display panel of claim 1, wherein, In the display area, the number of the first type of pixel circuit is greater than the number of the second type of pixel circuit.

5. The display panel of claim 1, wherein, The plurality of pixel circuits are divided into a plurality of pixel circuit groups arranged in an array, and one pixel circuit group comprises at least one second type of pixel circuit and a plurality of first type of pixel circuits.

6. The display panel of claim 5, wherein, In one pixel circuit group, one second type of pixel circuit is arranged between two adjacent first type of pixel circuits.

7. The display panel of claim 5, wherein, In one pixel circuit group, a plurality of first type of pixel circuits are arranged around one second type of pixel circuit.

8. The display panel of claim 5, wherein, The layout positions of the second type of pixel circuits in at least two pixel circuit groups are the same.

9. The display panel of claim 1, wherein, Each light emitting device comprises an anode and a cathode receiving a first power supply voltage; The driving transistor comprises a gate, a first electrode and a second electrode, the first electrode of the driving transistor is connected to the anode of the light emitting device, the second electrode of the driving transistor receives a second power supply voltage, and the second power supply voltage is different from the first power supply voltage; Each of the first type of pixel circuit and the second type of pixel circuit further comprises: a switching transistor comprising a first electrode and a second electrode, the first electrode of the switching transistor receives a data signal, and the second electrode of the switching transistor is connected to the gate of the driving transistor; The second type of pixel circuit further comprises a sensing transistor comprising a first electrode and a second electrode, the first electrode and the second electrode of the sensing transistor are connected between the first electrode of the driving transistor of the second type of pixel circuit and the sensing line.

10. The display panel of claim 9, wherein, Each of the first type of pixel circuit and the second type of pixel circuit further comprises: a light emitting control transistor comprising a first electrode, a second electrode and a gate, the gate of the light emitting control transistor receives a light emitting control signal, the first electrode of the light emitting control transistor receives the second power supply voltage, and the second electrode of the light emitting control transistor is connected to the second electrode of the driving transistor; and a capacitor connected between the first electrode of the driving transistor and the gate of the driving transistor.

11. The display panel of claim 9, wherein, The plurality of pixel circuits are divided into a plurality of pixel circuit groups arranged in an array, and one pixel circuit group includes at least one second-type pixel circuit and a plurality of first-type pixel circuits. The display panel further includes: a plurality of data lines for transmitting the data signals and connected to the first electrodes of the switching transistors of the first-type pixel circuits and the second-type pixel circuits respectively; in the extension direction of the data lines, the sensing transistors of at least two second-type pixel circuits respectively located in adjacent pixel circuit groups are arranged in alignment and connected to one sensing line.

12. The display panel of claim 9, wherein, The plurality of pixel circuits are divided into a plurality of pixel circuit groups arranged in an array, and one pixel circuit group includes at least one second-type pixel circuit and a plurality of first-type pixel circuits. The display panel further includes: a plurality of data lines for transmitting the data signals and connected to the first electrodes of the switching transistors of the first-type pixel circuits and the second-type pixel circuits respectively; in the extension direction of the data lines, the sensing transistors of at least two second-type pixel circuits respectively located in adjacent pixel circuit groups are arranged in alignment and connected to at least two different sensing lines respectively.

13. The display panel of claim 9, wherein, The first power supply voltage and the second power supply voltage are different constant voltages respectively.

14. The display panel of claim 9, wherein, In the case where the driving transistor is turned on, the difference between the second power supply voltage and the first power supply voltage is a first difference value; In the case where the driving transistor is turned off, the difference between the second power supply voltage and the first power supply voltage is a second difference value, and the second difference value is different from the first difference value.

15. The display panel of claim 9, wherein, The sensing transistor further includes a gate electrode receiving a scanning signal, and the switching transistors of the first-type pixel circuits and the second-type pixel circuits further include gate electrodes receiving the scanning signal.

16. The display panel of claim 9, wherein, The driving transistor in the first-type pixel circuit is the same as the driving transistor in the second-type pixel circuit; and / or, The switching transistor in the first-type pixel circuit is the same as the switching transistor in the second-type pixel circuit.

17. The display panel of claim 9, wherein, The driving transistor in the first-type pixel circuit and the driving transistor in the second-type pixel circuit both include low-temperature polysilicon transistors; and / or, The switching transistor in the first-type pixel circuit and the switching transistor in the second-type pixel circuit both include low-temperature polysilicon transistors; and / or, The sensing transistor in the second-type pixel circuit includes a low-temperature polysilicon transistor.

18. The display panel of claim 9, wherein, The driving transistor in the first-type pixel circuit and the driving transistor in the second-type pixel circuit are N-type transistors; and / or, The switching transistor in the first-type pixel circuit and the switching transistor in the second-type pixel circuit are P-type transistors; and / or, The sensing transistor in the second-type pixel circuit is a P-type transistor.

19. A display device, wherein, The display device includes a display panel, and the display panel includes: a plurality of light emitting devices located in the display area; and a plurality of pixel circuits, each of which includes a driving transistor, a switching transistor, and a sensing transistor. A plurality of pixel circuits are located in the display area and include a first type of pixel circuit and a second type of pixel circuit connected to the plurality of light emitting devices, the first type of pixel circuit and the second type of pixel circuit each including a drive transistor; a sensing line connected to the drive transistor of the second type of pixel circuit to receive an electrical signal output by the drive transistor turned on in the second type of pixel circuit; and an external circuit connected to the sensing line and configured to acquire the electrical signal.

20. The display device of claim 19, wherein, Each of the light emitting devices includes an anode and a cathode receiving a first power supply voltage; The drive transistor includes a gate, a first electrode, and a second electrode, the first electrode of the drive transistor being connected to the anode of the light emitting device, the second electrode of the drive transistor receiving a second power supply voltage, the second power supply voltage being different from the first power supply voltage; Each of the first type of pixel circuit and the second type of pixel circuit further includes: a switch transistor including a first electrode and a second electrode, the first electrode of the switch transistor receiving a data signal, the second electrode of the switch transistor being connected to the gate of the drive transistor; wherein the second type of pixel circuit further includes a sensing transistor including a first electrode and a second electrode, the first electrode and the second electrode of the sensing transistor being connected between the first electrode of the drive transistor of the second type of pixel circuit and the sensing line.

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