Display panel and display device

Abstract

The embodiment of the present application provides a display panel and a display device. The display panel comprises a light emitting device and a pixel circuit; the pixel circuit comprises a comparison module and a first transistor, the first transistor and the light emitting device are electrically connected in series between a first power supply end and a second power supply end, and an output end of the comparison module is coupled with a control end of the first transistor; a first input end of the comparison module receives a data signal, a second input end of the comparison module receives a step signal, and the comparison module is used for comparing the voltage of the data signal with the voltage of the step signal and providing a comparison result to the control end of the first transistor; a working period of the pixel circuit comprises a light emitting stage, and in the light emitting stage: the step signal comprises at least one platform signal and at least one slope signal, the platform signal is a constant voltage signal, and the voltage of the slope signal gradually changes with time. The present application can realize simple and flexible control of the light emitting time length of the light emitting device by cooperation of the platform signal and the slope signal.

Description

Technical Field

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

[0002] Micro-LEDs are widely used in the display field due to their advantages such as high brightness, low power consumption, fast response time, small size, and long lifespan. Micro-LEDs exhibit good performance in terms of brightness, response speed, contrast ratio, color saturation, power consumption, and lifespan. However, existing pixel circuits cannot control the emission duration of Micro-LEDs. Summary of the Invention

[0003] In view of this, the present invention provides a display panel and a display device to solve the technical problem of how to flexibly control the light emission duration of light-emitting devices.

[0004] In a first aspect, embodiments of the present invention provide a display panel, the display panel including light-emitting devices and pixel circuits;

[0005] The pixel circuit includes a comparison module and a first transistor. The first transistor and the light-emitting device are electrically connected between a first power supply terminal and a second power supply terminal. The output terminal of the comparison module is coupled to the control terminal of the first transistor.

[0006] The first input terminal of the comparison module receives a data signal, and the second input terminal of the comparison module receives a step signal. The comparison module is used to compare the voltage of the data signal with the voltage of the step signal and provide the comparison result to the control terminal of the first transistor.

[0007] The working cycle of the pixel circuit includes a light-emitting stage. In the light-emitting stage, the step signal includes at least one plateau signal and at least one ramp signal. The plateau signal is a constant voltage signal, and the voltage of the ramp signal changes gradually over time.

[0008] Secondly, based on the same inventive concept, embodiments of the present invention also provide a display device, including the display panel provided in any embodiment of the present application.

[0009] The display panel and display device provided in this embodiment of the invention have the following beneficial effects: A comparison module is provided in the pixel circuit. The comparison module is used to compare the voltage of the data signal and the voltage of the step signal, and to control the switching state of the first transistor using the comparison result. The light emission duration of the light-emitting device is controlled by controlling the on-time of the first transistor. The step signal includes at least one plateau signal and at least one ramp signal. The plateau signal is a constant voltage signal, which is easier to generate and its duration is easier to control. The light emission duration of the light-emitting device can be adjusted by adjusting the duration of the plateau signal. By setting the law of voltage change with time in the ramp signal, not only can the light emission duration be adjusted using the ramp signal, but the light emission period and non-light emission period can also be switched using the ramp signal. In this embodiment of the invention, the plateau signal and the ramp signal work together to achieve simple and flexible control of the light emission duration of the light-emitting device. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of the present invention, 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.

[0011] Figure 1 A schematic diagram of a pixel circuit provided in an embodiment of the present invention;

[0012] Figure 2 A timing diagram of the light emission stage provided in an embodiment of the present invention;

[0013] Figure 3 A schematic diagram of a step signal provided in an embodiment of the present invention;

[0014] Figure 4 This is a timing diagram of a luminescence stage in a related technology;

[0015] Figure 5 This is another schematic diagram of a step signal provided in an embodiment of the present invention;

[0016] Figure 6 This is another schematic diagram of a step signal provided in an embodiment of the present invention;

[0017] Figure 7 This is another schematic diagram of a step signal provided in an embodiment of the present invention;

[0018] Figure 8 This is another schematic diagram of a step signal provided in an embodiment of the present invention;

[0019] Figure 9This is another schematic diagram of a step signal provided in an embodiment of the present invention;

[0020] Figure 10 This is another schematic diagram of a step signal provided in an embodiment of the present invention;

[0021] Figure 11 This is another schematic diagram of a step signal provided in an embodiment of the present invention;

[0022] Figure 12 This is another schematic diagram of a step signal provided in an embodiment of the present invention;

[0023] Figure 13 This is another schematic diagram of a step signal provided in an embodiment of the present invention;

[0024] Figure 14 This is another schematic diagram of a step signal provided in an embodiment of the present invention;

[0025] Figure 15 This is another schematic diagram of a step signal provided in an embodiment of the present invention;

[0026] Figure 16 Another pixel circuit schematic diagram provided in an embodiment of the present invention;

[0027] Figure 17 A circuit diagram of another display panel provided in an embodiment of the present invention;

[0028] Figure 18 A circuit diagram of another display panel provided in an embodiment of the present invention;

[0029] Figure 19 Another pixel circuit schematic diagram provided in an embodiment of the present invention;

[0030] Figure 20 Another pixel circuit schematic diagram provided in an embodiment of the present invention;

[0031] Figure 21 Another pixel circuit schematic diagram provided in an embodiment of the present invention;

[0032] Figure 22 Another pixel circuit schematic diagram provided in an embodiment of the present invention;

[0033] Figure 23 Another pixel circuit schematic diagram provided in an embodiment of the present invention;

[0034] Figure 24 This is a schematic diagram of a display device provided in an embodiment of this application. Detailed Implementation

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0039] It should be understood that although the terms "first" and "second" may be used to describe XX in the embodiments of the present invention, these XX should not be limited to these terms. These terms are only used to distinguish XX from each other. For example, without departing from the scope of the embodiments of the present invention, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX.

[0040] To address the problems existing in related technologies, embodiments of the present invention provide a display panel in which a comparison module is provided in the pixel circuit, and a step signal is provided. The step signal includes at least one plateau signal and at least one ramp signal. The comparison module is used to compare the voltage of the data signal with the voltage of the step signal, and the comparison result of the comparison module is used to control the switching state of the first transistor, thereby controlling the on-time of the first transistor, and further controlling the light-emitting time of the light-emitting device, thus achieving flexible control of the light-emitting time of the light-emitting device.

[0041] This invention provides a display panel including multiple light-emitting devices and multiple pixel circuits. The pixel circuits are coupled to the light-emitting devices and are used to drive the light-emitting devices to emit light. The light-emitting devices are inorganic light-emitting diodes, such as Micro-LEDs and Mini-LEDs.

[0042] Figure 1 A pixel circuit schematic diagram provided for an embodiment of the present invention, such as... Figure 1As shown, the pixel circuit includes a comparison module 10 and a first transistor M1. The first transistor M1 and the light-emitting device 20 are electrically connected between a first power supply terminal V1 and a second power supply terminal V2. A first terminal of the first transistor M1 is coupled to the first power supply terminal V1, and a second terminal is coupled to the first electrode of the light-emitting device 20. The second electrode of the light-emitting device 20 is coupled to the second power supply terminal V2. The first power supply terminal V1 provides a positive power supply voltage, and the second power supply terminal V2 provides a negative power supply voltage. The output terminal of the comparison module 10 is coupled to the control terminal of the first transistor M1, meaning that the signal output from the comparison module 10 controls the switching state of the first transistor M1. Optionally, the first transistor M1 is a p-type transistor, and the active layer of the first transistor M1 contains silicon.

[0043] The first input terminal of the comparison module 10 receives the data signal Data, and the second input terminal of the comparison module 10 receives the step signal T. The comparison module 10 is used to compare the voltage of the data signal Data with the voltage of the step signal T and provide the comparison result to the control terminal of the first transistor M1.

[0044] The working cycle of a pixel circuit includes a light-emitting phase. Under normal circumstances, the working cycle of the pixel circuit is fixed when the display panel is displaying, and the duration of the light-emitting phase is also fixed. Figure 2 A timing diagram of the light emission stage provided in an embodiment of the present invention, such as Figure 2 As shown, in the light-emitting stage t1: the step signal T includes at least one platform signal P and at least one ramp signal S. The platform signal P is a constant voltage signal, and the voltage of the ramp signal S changes gradually with time. Figure 2 The diagram only uses the step signal T, which includes three platform signals P and three ramp signals S.

[0045] When the voltage of the data signal Data is greater than the voltage of the step signal T, the output signal of the comparison module 10 controls the first transistor M1 to turn on; when the voltage of the data signal Data is less than the voltage of the step signal T, the output signal of the comparison module 10 controls the first transistor M1 to turn off. When the first transistor M1 is on, the voltage of the first power supply terminal V1 is applied to the first electrode of the light-emitting device 20, controlling the light-emitting device 20 to emit light. The light-emitting duration of the light-emitting device 20 is related to the on-time of the first transistor M1; the longer the on-time of the first transistor M1, the longer the light-emitting duration of the light-emitting device 20. The light-emitting duration of the light-emitting device 20 is controlled by controlling the on-time of the first transistor M1. The longer the light-emitting duration of the light-emitting device 20, the greater its brightness. The grayscale displayed by the light-emitting device 20 is related to the light-emitting duration of the light-emitting device 20. Therefore, by adjusting the light-emitting duration of the light-emitting device 20, different grayscale levels can be displayed by the light-emitting device 20.

[0046] like Figure 2The diagram illustrates the emission period t in emission stage t1. 1-1 Non-luminous period t 1-2 During the luminescence period t 1-1 When the voltage of the internal data signal Data is greater than the voltage of the step signal T, the first transistor M1 turns on, and the light-emitting device 20 emits light. During the non-light-emitting period t... 1-2 When the voltage of the internal data signal Data is less than the voltage of the step signal T, the first transistor M1 is turned off, and the light-emitting device 20 does not emit light.

[0047] Figure 2 The diagram illustrates the luminescence stage t1, which includes the luminescence time period t. 1-1 Non-luminous period t 1-2 In some implementations, when the voltage of the data signal Data is sufficiently large, the data signal Data is greater than the voltage of the step signal T throughout the entire light-emitting stage t1, then the entire light-emitting stage t1 is a light-emitting period.

[0048] Taking a specific step signal T as an example, the principle of adjusting the light emission duration using the step signal T in the embodiments of the present invention will be briefly explained. Figure 3 This is a schematic diagram of a step signal provided in an embodiment of the present invention. Assuming the light-emitting phase in the pixel circuit's operating cycle is 0.8 μs, the step signal T rises from 0V to 5V within this 0.8 μs time period. When the data signal Data is 2.5V, within 0 to 0.32 μs, the data signal Data is greater than the voltage of the step signal T, so the comparison module 10 controls the first transistor M1 to turn on. During the period from 0.33 μs to 0.8 μs, the data signal Data is less than the voltage of the step signal T, so the comparison module 10 controls the first transistor M1 to turn off. That is, within the 0.8 μs light-emitting phase, the light-emitting device 20 emits light for 0.32 μs.

[0049] Figure 3 The diagram illustrates that the step signal T includes three platform signals P and three ramp signals S. The voltage of the first platform signal P is 1V, the voltage of the second platform signal P is 2V, and the voltage of the third platform signal P is 5V. When the data signal Data is still 2.5V, increasing the duration of the first or second platform signal P, while maintaining the same variation pattern of the ramp signal S, can lengthen the duration of the step signal T (which is less than 2.5V). Consequently, this lengthens the light-emitting duration of the light-emitting device 20, thus achieving control of the light-emitting duration by adjusting the step signal T.

[0050] The duration of light emission of the light-emitting device 20 can also be adjusted by adjusting the ramp signal S. Figure 3 Taking the ramp signal S as an example, where voltage and time have a linear relationship, for instance, adjusting... Figure 3The slope of the third ramp signal S can also increase the duration of the step signal T, which is less than 2.5V. Therefore, when the data signal Data is still 2.5V, the light-emitting duration of the light-emitting device 20 can be increased.

[0051] The display panel provided in this embodiment of the invention includes a comparison module 10 in the pixel circuit. The comparison module 10 compares the voltage of the data signal Data with the voltage of the step signal T, and uses the comparison result to control the switching state of the first transistor M1. The light-emitting duration of the light-emitting device 20 is controlled by controlling the on-time of the first transistor M1. The step signal T includes at least one plateau signal P and at least one ramp signal S. The plateau signal P is a constant voltage signal, which is easier to generate and its duration is easier to control. Adjusting the duration of the plateau signal P allows for adjustment of the light-emitting duration of the light-emitting device 20. By setting the voltage variation pattern of the ramp signal S over time, not only can the light-emitting duration be adjusted using the ramp signal S, but the light-emitting period and non-light-emitting period can also be switched using the ramp signal S. In this embodiment of the invention, the plateau signal P and the ramp signal S work together to achieve simple and flexible control of the light-emitting duration of the light-emitting device 20.

[0052] Furthermore, in this embodiment of the invention, the light-emitting duration of the light-emitting device 20 can be controlled by adjusting the duration of the platform signal P. A longer platform signal P duration results in a longer light-emitting duration, greater brightness, and higher grayscale levels for the light-emitting device 20. In other words, the light-emitting duration is adjusted by regulating the platform signal P, thereby controlling the grayscale levels. This invention utilizes the platform signal P to control the light-emitting duration, making it easier to control. Multiple platform signals P can be set within the step signal T, thus dividing the light-emitting duration gradient into more segments, resulting in more grayscale levels and richer colors on the display panel.

[0053] In one related technology, a linearly varying ramp signal is used to control the emission duration of a light-emitting device. Figure 4 This is a timing diagram of a luminescence stage in a related technology, such as... Figure 4 As shown, a ramp signal X′ is provided. The period during which the voltage of the data signal Data is greater than the voltage of the ramp signal X′ is the emission period t. 1-1 The light-emitting device is controlled to emit light during this period; the period when the voltage of the data signal Data is less than the voltage of the ramp signal X′ is the non-light-emitting period t. 1-2 During this period, the light-emitting device does not emit light. In related technologies, during the light-emitting stage t1, the ramp signal X′ is a signal in which the voltage changes linearly with time. The light-emitting duration needs to be controlled by adjusting the slope of the ramp signal X′. At the same time, the ramp signal X′ also needs to meet the light-emitting duration requirements under different gray levels. The generation method of this linearly changing signal is relatively complex.

[0054] In this embodiment of the invention, the step signal T includes at least one platform signal P and at least one ramp signal S. Compared to the ramp signal X′, the platform signal P is easier to generate and its duration is easier to control. By adjusting the duration of the platform signal P, the light emission duration of the light-emitting device 20 can be adjusted, making it more flexible and easier to implement in controlling the light emission duration.

[0055] In some embodiments, the display panel includes a driver chip, which contains a signal generation module for generating a step signal T. The signal generation module converts a digital signal into an analog signal to generate the step signal T. Optionally, in the display device, the signal generation module generates the step signal T using Fourier transform or other computational processing methods based on the data signal transmitted from the main control module.

[0056] In some implementations, during the light-emitting stage t1, the step signal T includes n segments of platform signals P and m segments of ramp signals S; n and m are both positive integers, n≥2, m≥2. n and m can be the same or different. The platform signals P and at least one segment of the ramp signal S are continuous. Adjusting the duration of the platform signal P allows for regulation of the light-emitting duration of the light-emitting device 20. By setting the voltage variation over time in the ramp signal S, the light-emitting duration can also be adjusted, and the ramp signal S can be used to switch between light-emitting and non-light-emitting periods. The platform signals P and ramp signals S work together to achieve simple and flexible control of the light-emitting duration of the light-emitting device 20. Furthermore, the more segments of the platform signal P, the more gradients the light-emitting duration can be divided, resulting in more grayscale levels for the light-emitting device and thus richer colors on the display panel.

[0057] In this embodiment of the invention, the waveform of the step signal T during the light emission stage can have a variety of selectable shapes. Examples of selectable waveforms of the step signal T are given below.

[0058] In some implementations, the voltage value of the n-segment platform signal gradually increases over time. Figure 5 This is another schematic diagram of a step signal provided in an embodiment of the present invention. Figure 5 The waveform of the step signal T during the light-emitting stage is illustrated, along with three plateau signals P and three ramp signals S, i.e., n = m = 3. For example... Figure 5 As shown, during the 0.8μs time period of the light-emitting phase, the step signal T rises from 0V to 5V. As time changes, the voltage values ​​of the three plateau signals P gradually increase. The voltage value of the data signal Data is greater than 0V. This is used in the pixel circuit. Figure 5When the step signal T is provided in the embodiment, the initial stage of the light-emitting phase is the light-emitting period, followed by a non-light-emitting period, meaning that the light-emitting device 20 first emits light and then stops emitting light. The larger the voltage value of the data signal Data, the larger the proportion of the light-emitting period in the light-emitting phase, and the longer the light-emitting duration of the light-emitting device 20.

[0059] In some implementations, the voltage value of the n-segment platform signal gradually decreases over time. Figure 6 This is another schematic diagram of a step signal provided in an embodiment of the present invention. Figure 6 This illustrates that the step signal T in the luminescence stage includes three plateau signals P and three ramp signals S, i.e., n = m = 3. For example... Figure 6 As shown, during the 0.8μs time period of the light-emitting phase, the step signal T drops from 5V to 0V. As time changes, the voltage values ​​of the three plateau signals P gradually decrease. The voltage value of the data signal Data is greater than 0V, which is used in the pixel circuit. Figure 6 When the step signal T is provided in the embodiment, the initial stage of the light-emitting phase is a non-light-emitting period, followed by a light-emitting period, meaning that the light-emitting device 20 first does not emit light and then emits light. The larger the voltage value of the data signal Data, the shorter the initial non-light-emitting period and the longer the later light-emitting period, thus the longer the light-emitting duration of the light-emitting device 20.

[0060] In some implementations, the voltage value of the n-segment platform signal first gradually increases and then gradually decreases over time. Figure 7 This is another schematic diagram of a step signal provided in an embodiment of the present invention. Figure 7 The illustration shows that the step signal T in the luminescence stage includes 5 plateau signals P and 6 ramp signals S. For example... Figure 7 As shown, during the 1.1μs time period of the light-emitting phase, the step signal T first rises from 0V to 5V, and then falls from 5V back to 0V. As time changes, the voltage values ​​of the five plateau signals P first increase and then decrease. The pixel circuit uses... Figure 7 The step signal T provided in the embodiment, taking a data signal Data voltage value of 3V as an example, has an initial light-emitting period, followed by a non-light-emitting period, and then another light-emitting period. That is, the light-emitting device 20 first emits light, then does not emit light, and then emits light again. The sum of the durations of the two light-emitting periods is the light-emitting duration of the light-emitting device 20.

[0061] Figure 7 The waveform of the step signal T provided in the embodiment can be a symmetrical waveform, that is, the voltages and durations of the second and fourth platform signals P are equal, and the voltages and durations of the first and fifth platform signals P are equal. In this embodiment, when the durations of the two consecutive light emission periods in the light emission stage are equal and the waveform of the step signal T is a symmetrical waveform, the step signal T has strong regularity and the generation method is relatively simpler.

[0062] Optional, Figure 7 The waveform of the step signal T, which varies with time and whose voltage value of n platform signals gradually increases and then gradually decreases, as illustrated in the embodiment, can also be an asymmetric waveform.

[0063] In some implementations, the voltage value of the n-segment platform signal first gradually decreases and then gradually increases over time. Figure 8 This is another schematic diagram of a step signal provided in an embodiment of the present invention. Figure 8 The illustration shows that the step signal T in the luminescence stage includes 5 plateau signals P and 6 ramp signals S. For example... Figure 8 As shown, during the 1.1μs time period of the light-emitting phase, the step signal T first decreases from 5V to 0V, and then rises from 0V to 5V. As time changes, the voltage values ​​of the five plateau signals P first decrease and then increase. The pixel circuit uses... Figure 8 When the step signal T provided in the embodiment is active, the initial stage of the light-emitting phase is a non-light-emitting period, followed by a light-emitting period, and then another non-light-emitting period. That is, the light-emitting device 20 first does not emit light, then emits light, and then does not emit light again.

[0064] Figure 8 The step signal waveform provided in the embodiment can be a symmetrical waveform or an asymmetrical waveform.

[0065] In some implementations... Figure 9 This is another schematic diagram of a step signal provided in an embodiment of the present invention. For example... Figure 9 As shown, taking n=3 as an example, the voltage values ​​of the three platform signals P gradually increase over time. The ramp signal S corresponds one-to-one with the platform signal P, rising from 0V to the voltage value of its corresponding platform signal P. The pixel circuit uses... Figure 9 The step signal T provided in the embodiment, for example, when the voltage value of the data signal Data is 2.5V, during the duration of the first two platform signals P and the first two ramp signals S, and during a portion of the duration of the third ramp signal S, the voltage of the step signal P is less than 2.5V. During this period, the light-emitting device 20 emits light, which is the light-emitting period. The remaining portion of the duration of the third ramp signal S and the duration of the third platform signal P are the non-light-emitting periods.

[0066] In some implementations... Figure 10 This is another schematic diagram of a step signal provided in an embodiment of the present invention. For example... Figure 10 As shown, taking n=3 as an example, as time changes, the voltage values ​​of the three platform signals P gradually decrease. The ramp signal S corresponds one-to-one with the platform signal P, and the voltage value of the ramp signal S drops from its corresponding platform signal P to 0V. The pixel circuit uses... Figure 10When the step signal T is provided in the embodiment, the light emission stage is generally first a non-light emission period and then a light emission period.

[0067] In some implementations, the voltage-time function relationship of the q-segment ramp signals S in the step signal T is the same, where q is a positive integer and q≤m. If the pattern of the q-segment ramp signals S is the same, then the generation method of the q-segment ramp signals S can be the same, making the step signal T easier to generate. Preferably, the voltage-time function relationship of all ramp signals S in the step signal T is the same, so all ramp signals S are generated using the same generation method. Figure 5 In the example embodiment, the voltage and time in the three ramp signals S are linearly related, and the linear correlation coefficient between the voltage and time in the three ramp signals S is the same, while the duration of the three ramp signals S can be different.

[0068] In this embodiment of the invention, the voltage-time function relationship of the ramp signal S can be a nonlinear relationship. Figure 11 This is another schematic diagram of a step signal provided in an embodiment of the present invention. For example... Figure 11 As shown, the voltage-time function relationship in the ramp signal S is nonlinear, and the voltage-time variation relationship of the three ramp signal S segments is the same.

[0069] In some implementations, such as Figure 5 As shown, the ramp signal S includes a first ramp signal S1 and a second ramp signal S2. The duration of the first ramp signal S1 is Δ1, and the duration of the second ramp signal S2 is Δ2. It can be seen that Δ1 is greater than Δ2. This embodiment of the invention can not only adjust the emission duration using the ramp signal S, but also switch between emission and non-emission periods using the ramp signal S. Figure 5 The voltage value of the data signal Data1, as illustrated in the diagram, is within the voltage variation range of the first ramp signal S1. The time point t1′ is the node where the light-emitting period and the non-light-emitting period switch. Providing the data signal Data1 to the pixel circuit can control the light-emitting device 20 to have a certain light-emitting duration, so that the light-emitting device 20 displays a specific gray level. It can be understood that the second ramp signal S2 can also be used to adjust the light-emitting duration, so that the light-emitting device 20 displays certain specific gray levels. In this embodiment of the invention, the step signal T is configured to contain ramp signals S with different durations to meet the requirements of different gray levels for light-emitting duration.

[0070] In some implementations... Figure 12 This is another schematic diagram of a step signal provided in an embodiment of the present invention. For example... Figure 12As shown, the n-segment platform signal P includes a first platform signal P1 and a second platform signal P2. The voltage values ​​and durations of the first platform signal P1 and the second platform signal P2 are different. The platform signal P is a constant voltage signal and can be used to adjust the light emission duration. Since the voltage values ​​of the first platform signal P1 and the second platform signal P2 are different, they can be used to adjust the light emission duration under different data signals (Data). For example, if the first platform signal P1 is greater than the second platform signal P2, when the voltage value of the first data signal is between the voltage of the second platform signal P2 and the voltage of the first platform signal P1, adjusting the duration of the second platform signal P2 can adjust the light emission duration of the light-emitting device 20 under the first data signal. When the voltage value of the second data signal is greater than the voltage of the first platform signal P1, and the duration of the second platform signal P2 remains unchanged, adjusting the duration of the first platform signal P1 can adjust the light emission duration of the light-emitting device 20 under the second data signal. The first data signal and the second data signal correspond to different gray levels, thus satisfying the requirements of different gray levels for the light emission duration of the light-emitting device 20.

[0071] Figure 12 The diagram illustrates that the voltage value of the first platform signal P1 is greater than the voltage value of the second platform signal P2, and the duration of the first platform signal P1 is Δ3, while the duration of the second platform signal P2 is Δ4, where Δ3 is less than Δ4. In the step signal T, the voltage value of the platform signal P can be set to be larger, and its duration shorter. When the voltage of the data signal Data is greater than the voltage of the step signal T, the first transistor M1 is turned on, controlling the light-emitting device 20 to emit light; when the voltage of the data signal Data is less than the voltage of the step signal T, the first transistor M1 is turned off, and the light-emitting device 20 does not emit light. The data signal Data corresponds to the grayscale level; the larger the voltage value of the data signal Data, the longer the required light-emitting duration of the light-emitting device 20, resulting in a higher grayscale level displayed by the light-emitting device 20. For example, when the voltage value of the second data signal is greater than the voltage of the first platform signal P1, the duration of the second platform signal P2 and the duration of the ramp signal S (where the voltage is less than the voltage of the first platform signal P1) are both considered light-emitting periods. Setting the duration of the first platform signal P1 to be less than the duration of the second platform signal P2 can also meet the requirement for the light-emitting duration under the second data signal. This also allows for setting a relatively large number of platform signals P while keeping the duration of the light-emitting phase fixed, enabling the light-emitting device 20 to display a relatively large number of gray levels, thereby making the display panel more colorful.

[0072] In this embodiment of the invention, the light-emitting device 20 includes a first light-emitting device and a second light-emitting device with different colors; the step signal T includes a first step signal and a second step signal, the waveforms of which are different; a pixel circuit coupled to the first light-emitting device receives the first step signal, and a pixel circuit coupled to the second light-emitting device receives the second step signal. The luminous efficiency of light-emitting devices 20 of different colors varies. Step signals T can be set separately for light-emitting devices 20 of different colors, and the luminous duration can be adjusted using their respective corresponding step signals T to meet the luminous duration requirements of each color light-emitting device 20 at different gray levels.

[0073] The display panel includes light-emitting devices of three colors: red, green, and blue. In some embodiments, step signals T are set for each of the three colors of light-emitting devices.

[0074] In some implementations... Figure 13 This is another schematic diagram of a step signal provided in an embodiment of the present invention. Figure 13 This illustrates the first step signal T1 and the second step signal T2. For example... Figure 13 As shown, the platform signal in the first step signal T1 includes the third platform signal P3, and the platform signal in the second step signal T2 includes the fourth platform signal P4; the third platform signal P3 and the fourth platform signal P4 have the same voltage value but different durations. Taking the voltage value of the data signal Data as 2.3V as an example, from... Figure 13 It can be seen that when the first step signal T1 is provided to the pixel circuit, the switching node between the light-emitting period and the non-light-emitting period is at time t2′; when the second step signal T2 is provided to the pixel circuit, the switching node between the light-emitting period and the non-light-emitting period is at time t3′, and time point t2′ is earlier than time point t3′. By setting the durations of the third platform signal P3 and the fourth platform signal P4 to be different, the light-emitting durations of the first light-emitting device and the second light-emitting device under the same data voltage Data can be made different. When there is a difference in the luminous efficiency of the first light-emitting device and the second light-emitting device, the design of this embodiment can achieve the same grayscale level control for different color light-emitting devices under the same data voltage Data, and can drive different color light-emitting devices using the same data voltage-grayscale correspondence, simplifying the driving method of the display panel.

[0075] In one embodiment, the luminous efficiency of the first light-emitting device is greater than that of the second light-emitting device. For example... Figure 13As shown, the duration of the third platform signal P3 is shorter than the duration of the fourth platform signal P4. Taking a data signal Data voltage of 2.3V as an example, a first step signal T1 is provided to the pixel circuit corresponding to the first light-emitting device, and the light-emitting duration of the first light-emitting device is t2′. A second step signal T2 is provided to the pixel circuit corresponding to the second light-emitting device, and the light-emitting duration of the second light-emitting device is t3′, where t2′ is shorter than t3′. By increasing the duration of the platform signal to compensate for the difference in luminous efficiency of the light-emitting devices, it is possible to control the same grayscale level of different color light-emitting devices with the same data voltage Data. This allows for the use of the same data voltage-grayscale correspondence to drive different color light-emitting devices, simplifying the driving method of the display panel.

[0076] In some implementations... Figure 14 This is another schematic diagram of a step signal provided in an embodiment of the present invention. Figure 14 The diagram illustrates the first step signal T1 and the second step signal T2. Both the first step signal T1 and the second step signal T2 have the same number of platform signal segments; for example, n=3. The voltage value of the i-th platform signal P in the first step signal T1 is different from the voltage value of the i-th platform signal P in the second step signal T2, where i is a positive integer, i≥1. Figure 14 The illustration only shows that the voltage value of the i-th platform signal P in the first step signal T1 is less than the voltage value of the i-th platform signal P in the second step signal T2. This embodiment can achieve different light emission durations for the first and second light-emitting devices under the same data voltage Data, thereby compensating for the difference in luminous efficiency of the light-emitting devices. It can also achieve the same grayscale level for different color light-emitting devices under the same data voltage Data. This embodiment can drive different color light-emitting devices using the same data voltage-grayscale correspondence, simplifying the driving method of the display panel.

[0077] In some implementations... Figure 15 This is another schematic diagram of a step signal provided in an embodiment of the present invention. Figure 15 This illustrates the first step signal T1 and the second step signal T2. For example... Figure 15As shown, the ramp signal S includes a third ramp signal S3 and a fourth ramp signal S4, the first step signal T1 includes the third ramp signal S3, and the second step signal T2 includes the fourth ramp signal S4. The rate of change of voltage over time in the third ramp signal S3 is greater than the rate of change of voltage over time in the fourth ramp signal S4. When the voltage value of the data voltage Data is within the voltage variation range of the third ramp signal S3 and the fourth ramp signal S4, the first step signal T1 is provided to the pixel circuit, and the switching phase between the light-emitting and non-light-emitting periods is time point t4′. The second step signal T2 is provided to the pixel circuit, and the switching phase between the light-emitting and non-light-emitting periods is time point t5′. It can be seen that t4′ is earlier than t5′, that is, the light-emitting duration of the first light-emitting device is less than the light-emitting duration of the second light-emitting device. That is, by setting the difference in the rate of change of voltage over time of the ramp signals in the first step signal T1 and the second step signal T2, the difference in the light-emitting duration of the first and second light-emitting devices can be controlled to meet the light-emitting duration requirements of different color light-emitting devices.

[0078] In some implementations, when the voltage variation range of the ramp signal S is determined, the longer the duration of the ramp signal S, the greater the amplitude of the adjustment of the emission duration by the ramp signal S. For example... Figure 15 As shown, the duration of the third ramp signal S3 is shorter than the duration of the fourth ramp signal S4. Therefore, when the data voltage Data is within the voltage variation range of the third ramp signal S3 and the fourth ramp signal S4, a first step signal T1 is provided to the pixel circuit corresponding to the first light-emitting device, and a second step signal T2 is provided to the pixel circuit corresponding to the second light-emitting device. This ensures that the light-emitting duration of the first light-emitting device is shorter than that of the second light-emitting device. In other words, by setting the difference in the duration of the ramp signals in the first step signal T1 and the second step signal T2, the difference in the light-emitting duration of the first and second light-emitting devices can be controlled, meeting the light-emitting duration requirements of different color light-emitting devices.

[0079] In some embodiments, the light-emitting device 20 includes a first light-emitting device and a second light-emitting device of different colors; the pixel circuits coupled to the first and second light-emitting devices receive the same waveform of the step signal T. Using the same step signal T to drive the first and second light-emitting devices to emit light reduces the number of step signals T set in the display panel, simplifies the generation of the step signals T, and simplifies the driving method of the display panel.

[0080] The display panel provided in this embodiment of the invention includes three light-emitting devices 20 of red, green, and blue colors. In one embodiment, the pixel circuits coupled to the three light-emitting devices 20 of different colors receive the same waveform of the step signal T. That is, only one step signal T is provided in the display panel, which not only simplifies the driving method of the display panel, but also simplifies the wiring method of the step signal lines in the display panel.

[0081] In some implementations... Figure 16 This is another pixel circuit schematic diagram provided for an embodiment of the present invention. (See diagram below.) Figure 16 As shown, the first voltage terminal of the comparison module 10 receives a high-level signal VGH, and the second voltage terminal of the comparison module 10 receives a low-level signal VGL. The voltage value of the high-level signal VGH is greater than the voltage value of the low-level signal VGL. When the voltage of the data signal Data is greater than the voltage of the step signal T, the comparison module 10 provides the low-level signal VGL to the control terminal of the first transistor M1. The first transistor M1 is turned on under the control of the low-level signal VGL. Turning on the first transistor M1 controls the application of the voltage of the first power supply terminal V1 to the first electrode of the light-emitting device 20, thereby controlling the light-emitting device 20 to emit light. When the voltage of the data signal Data is less than the voltage of the step signal T, the comparison module 10 provides the high-level signal VGH to the control terminal of the first transistor M1. The first transistor M1 is turned off under the control of the high-level signal VGH. When the first transistor M1 is turned off, the light-emitting device 20 does not emit light.

[0082] Optionally, the comparison module 10 includes a comparator. The comparator can be any structure found in the prior art. In one embodiment, such as... Figure 16 As shown, the comparison module 10 includes a sixth transistor M6, a seventh transistor M7, an eighth transistor M8, a ninth transistor M9, a tenth transistor M10, and an inverter 30. Figure 16 The control signal Vb can be a constant voltage signal, controlling the sixth transistor M6 to be in the on state. The function of the inverter 30 is to increase the gain, so that the voltage output of the comparator module 10 reaches the saturation state, and can stably output a high-level signal VGH or a low-level signal VGL, thereby stabilizing the working state of the first transistor M1.

[0083] In comparison module 10, each transistor is illustrated as a p-type transistor. In other embodiments, each transistor in comparison module 10 is an n-type transistor.

[0084] In another embodiment, the comparison module 10 includes a switching transistor. The gate and source of the switching transistor each receive a data voltage Data and a step signal T, respectively. The output of the drain of the switching transistor is controlled by comparing the voltages at the gate and source. The drain of the switching transistor is the output terminal of the comparison module 10, and the drain of the switching transistor is connected to the control terminal of the first transistor M1.

[0085] In some implementations... Figure 17 This is a circuit diagram of another display panel provided in an embodiment of the present invention. Figure 17 The comparison module 10 in the mid-pixel circuit is only shown in a simplified diagram. For example... Figure 17 As shown, the light-emitting device 20 includes a first light-emitting device 21 and a second light-emitting device 22 of different colors. The luminous efficiency of the first light-emitting device 21 is lower than that of the second light-emitting device 22. The low-level signal VGL includes a first low-level signal VGL1 and a second low-level signal VGL2. The voltage value of the first low-level signal VGL1 is lower than that of the second low-level signal VGL2. The comparison module 10 in the pixel circuit coupled to the first light-emitting device 21 receives the first low-level signal VGL1, and the comparison module 20 in the pixel circuit coupled to the second light-emitting device 22 receives the second low-level signal VGL2. In this embodiment, the voltage values ​​of the low-level signals VGL received by the comparison modules 10 in the pixel circuits driving the light-emitting devices 20 of different colors are set to be different. This allows the first transistor M1 in the pixel circuits of the light-emitting devices 20 of different colors to be turned on at different degrees, thereby causing the light-emitting current of the light-emitting devices 20 to be different. This embodiment can adjust the light-emitting current of the light-emitting devices 20 of different colors separately.

[0086] Wherein, the voltage value of the first low-level signal VGL1 is less than the voltage value of the second low-level signal VGL2, then the luminous current of the first light-emitting device 21 is greater than the luminous current of the second light-emitting device 22 during the light-emitting stage, thereby compensating for the difference in luminous efficiency between the first light-emitting device 21 and the second light-emitting device 22.

[0087] In some implementations... Figure 18 This is a circuit diagram of another display panel provided in an embodiment of the present invention. Figure 18As shown, the display panel includes a step signal line 40 and a data signal line 50. The step signal line 40 provides a step signal T, and the data signal line 50 provides a data signal Data. The step signal line 40 extends along a first direction a, and the data signal line 50 extends along a second direction b, with the first direction a and the second direction b intersecting. Multiple pixel circuits 01 arranged in the first direction a are coupled to the same step signal line 40, and multiple pixel circuits 01 arranged in the second direction b are coupled to the same data signal line 50. In this embodiment, the multiple pixel circuits 01 arranged in the first direction a share the step signal line 40, which reduces the number of lines in the step signal line 40 and simplifies the wiring of the display panel.

[0088] Optionally, if multiple pixel circuits 01 arranged in the first direction a are coupled to at least two kinds of light-emitting devices 20, then the pixel circuits 01 coupled to at least two kinds of light-emitting devices 20 in the display panel share a step signal T, which reduces the number of step signals T set in the display panel, makes the generation of step signals T simpler, and simplifies the driving method of the display panel.

[0089] In some implementations... Figure 19 Another pixel circuit schematic diagram provided in an embodiment of the present invention, such as... Figure 19 As shown, the pixel circuit also includes a second transistor M2. The control terminal of the second transistor M2 receives the first scan signal Scan1, the first terminal of the second transistor M2 receives the data signal Data, and the second terminal of the second transistor M2 is coupled to the first input terminal of the comparison module 10. The transistor type of the second transistor M2 is the same as that of the first transistor M1. The first scan signal Scan1 provides an enable signal to control the second transistor M2 to turn on and provide the data signal Data to the first input terminal of the comparison module 10. When the second transistor M2 is turned off, it stops writing signals to the first input terminal of the comparison module 10. When displaying an image, the data voltage Data corresponding to different light-emitting devices 20 is different, and the data voltage Data is provided to the pixel circuit by the data signal line. By setting the second transistor M2 in the pixel circuit, multiple pixel circuits can share a single data signal line.

[0090] In some implementations... Figure 20 Another pixel circuit schematic diagram provided in an embodiment of the present invention, such as... Figure 20 As shown, the pixel circuit includes a first capacitor C1. One plate of the first capacitor C1 is coupled to the first power supply terminal V1, and the other plate is coupled to the control terminal of the first transistor M1. The first capacitor C1 can stabilize the potential of the control terminal of the first transistor M1, ensuring the stable operation of the first transistor M1.

[0091] In some implementations... Figure 21Another pixel circuit schematic diagram provided in an embodiment of the present invention, such as... Figure 21 As shown, the pixel circuit includes a second capacitor C2. One plate of the second capacitor C2 is coupled to the first power supply terminal V1, and the other plate is coupled to the first input terminal of the comparison module 10. The second capacitor C2 can stabilize the potential of the first input terminal of the comparison module 10, that is, ensure that the data voltage Data input to the first input terminal of the comparison module 10 is stable when the comparison module 10 is working, thereby ensuring the stability of the signal output from the output terminal of the comparison module 10.

[0092] In some implementations, the pixel circuit includes both a first capacitor C1 and a second capacitor C2.

[0093] In some implementations... Figure 22 Another pixel circuit schematic diagram provided in an embodiment of the present invention, such as... Figure 22 As shown, the pixel circuit also includes a third transistor M3, which is connected between the first transistor M1 and the light-emitting device 20. The control terminal of the third transistor M3 receives a second scan signal Scan2; wherein the pulse width of the enable signal in the second scan signal Scan2 is greater than the pulse width of the enable signal in the first scan signal Scan1. In this embodiment, when the first transistor M1 and the third transistor M3 are turned on simultaneously, the voltage of the first power supply terminal V1 is provided to the light-emitting device 20 to control the light-emitting device 20 to emit light. Since the control terminal of the first transistor M1 is connected to the output terminal of the comparison module 10, the on-time of the first transistor M1 mainly affects the light-emitting duration of the light-emitting device 20. The pulse width of the enable signal in the second scan signal Scan2 can be set to be equal to the total duration of the light-emitting phase of the pixel circuit, thereby ensuring that the on-time of the third transistor M3 covers the on-time of the first transistor M1, thus enabling the light-emitting duration of the light-emitting device 20 to be controlled by adjusting the on-time of the first transistor M1.

[0094] In some implementations... Figure 23 Another pixel circuit schematic diagram provided in an embodiment of the present invention, such as... Figure 23As shown, the pixel circuit also includes a fourth transistor M4 and a fifth transistor M5. The control terminal of the fourth transistor M4 receives the third scan signal Scan3, the first terminal of the fourth transistor M4 receives the data signal Data, and the second terminal of the fourth transistor M4 is coupled to the control terminal of the fifth transistor M5. The fifth transistor M5 is electrically connected between the first power supply terminal V1 and the first transistor M1. The pulse width of the enable signal in the first scan signal Scan1 is greater than the pulse width of the enable signal in the third scan signal Scan3. In this embodiment, the fifth transistor M5 is equivalent to a driving transistor, and it is used to generate a driving current. The third scan signal Scan3 provides an enable signal to control the fourth transistor M4 to turn on, and provides the data signal Data to the control terminal of the fifth transistor M5. The fifth transistor M5 generates a driving current under the control of the data signal Data. When the first transistor M1 is turned on, the driving current is provided to the light-emitting device 20, so the on-time of the first transistor M1 affects the light-emitting time of the light-emitting device 20. In this embodiment, the enable signal in the first scan signal Scan1 is used to control the supply of data voltage Data to the first input terminal of the comparison module 10. The enable signal in the first scan signal Scan1 has a relatively large pulse width. For example, the pulse width of the enable signal in the first scan signal Scan1 can be set to be equal to the total duration of the pixel circuit's light-emitting phase. This allows for a continuous supply of data voltage Data to the first input terminal of the comparison module 10 during the light-emitting phase, ensuring that the comparison module 10 is operational throughout the entire light-emitting phase. This also enables the comparison module 10 to control the on-time of the first transistor M1, thereby adjusting the light-emitting duration of the light-emitting device 20.

[0095] In the above embodiments, the transistors are all illustrated as p-type. The embodiments of the present invention do not limit the type of transistor.

[0096] Based on the same inventive concept, embodiments of the present invention also provide a display device. Figure 24 A schematic diagram of a display device provided in an embodiment of this application is shown below. Figure 24 As shown, the display device includes a display panel 100 provided in any embodiment of the present invention. The structure of the display panel 100 has been described in the above embodiments and will not be repeated here. The display device provided in the embodiments of the present invention can be, for example, a computer, television, tablet computer, e-reader, in-vehicle display, or other electronic devices with display functions.

[0097] Those skilled in the art will clearly understand that the techniques in the embodiments of the present invention can be implemented using software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solutions in the embodiments of the present invention, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or certain parts of the embodiments of the present invention.

[0098] The same or similar parts between the various embodiments in this specification can be referred to mutually. In particular, the device embodiments and terminal embodiments are basically similar to the method embodiments, so the description is relatively simple, and the relevant parts can be referred to the description in the method embodiments.

Claims

1. A display panel, characterized in that, The display panel includes light-emitting devices and pixel circuits; The pixel circuit includes a comparison module and a first transistor. The first transistor and the light-emitting device are electrically connected between a first power supply terminal and a second power supply terminal. The output terminal of the comparison module is coupled to the control terminal of the first transistor. The first input terminal of the comparison module receives a data signal, and the second input terminal of the comparison module receives a step signal. The comparison module is used to compare the voltage of the data signal with the voltage of the step signal and provide the comparison result to the control terminal of the first transistor. The working cycle of the pixel circuit includes a light-emitting stage. In the light-emitting stage, the step signal includes at least one plateau signal and at least one ramp signal. The plateau signal is a constant voltage signal, and the voltage of the ramp signal changes gradually over time. The light-emitting device includes a first light-emitting device and a second light-emitting device with different colors; The step signal includes a first step signal and a second step signal, and the waveforms of the first step signal and the second step signal are different; The pixel circuit coupled to the first light-emitting device receives the first step signal, and the pixel circuit coupled to the second light-emitting device receives the second step signal.

2. The display panel according to claim 1, characterized in that, During the light-emitting stage: the step signal includes n segments of the platform signal and m segments of the ramp signal; n and m are both positive integers, n≥2, m≥2.

3. The display panel according to claim 2, characterized in that, The step signal during the light emission phase satisfies at least one of the following: As time changes, the voltage value of the platform signal in segment n gradually increases; As time changes, the voltage value of the platform signal in segment n gradually decreases; As time changes, the voltage value of the platform signal in segment n first gradually increases and then gradually decreases; As time changes, the voltage value of the platform signal in segment n first gradually decreases and then gradually increases; As time changes, the voltage value of the n-segment platform signal gradually increases, and the ramp signal corresponds one-to-one with the platform signal. The ramp signal rises from 0V to the voltage value of the platform signal corresponding to it. As time changes, the voltage value of the n-segment platform signal gradually decreases. The ramp signal corresponds one-to-one with the platform signal, and the voltage value of the ramp signal drops from the corresponding platform signal to 0V.

4. The display panel according to claim 2, characterized in that, The voltage-time function relationship of the ramp signal in segment q is the same, where q is a positive integer and q≤m.

5. The display panel according to claim 4, characterized in that, The ramp signal in segment q includes a first ramp signal and a second ramp signal, wherein the duration of the first ramp signal is greater than the duration of the second ramp signal.

6. The display panel according to claim 2, characterized in that, The n-segment platform signal includes a first platform signal and a second platform signal, wherein the voltage values ​​of the first platform signal and the second platform signal are different and the durations are different.

7. The display panel according to claim 6, characterized in that, The voltage value of the first platform signal is greater than the voltage value of the second platform signal, and the duration of the first platform signal is less than the duration of the second platform signal.

8. The display panel according to claim 1, characterized in that, The platform signal in the first step signal includes a third platform signal, and the platform signal in the second step signal includes a fourth platform signal; The third platform signal and the fourth platform signal have the same voltage value but different durations.

9. The display panel according to claim 8, characterized in that, The luminous efficiency of the first light-emitting device is greater than that of the second light-emitting device; The duration of the third platform signal is shorter than the duration of the fourth platform signal.

10. The display panel according to claim 1, characterized in that, The number of segments in the platform signal in the first step signal and the second step signal is the same. The voltage value of the platform signal in the i-th segment of the first step signal is different from the voltage value of the platform signal in the i-th segment of the second step signal, where i is a positive integer and i≥1.

11. The display panel according to claim 1, characterized in that, The ramp signal includes a third ramp signal and a fourth ramp signal. The first step signal includes the third ramp signal, and the second step signal includes the fourth ramp signal; the rate of change of voltage over time in the third ramp signal is greater than the rate of change of voltage over time in the fourth ramp signal, and / or the duration of the third ramp signal is less than the duration of the fourth ramp signal.

12. The display panel according to claim 1, characterized in that, The first voltage terminal of the comparison module receives a high-level signal, and the second voltage terminal of the comparison module receives a low-level signal, wherein the voltage value of the high-level signal is greater than the voltage value of the low-level signal; When the voltage of the data signal is greater than the voltage of the step signal, the comparison module provides the low-level signal to the control terminal of the first transistor, and the first transistor turns on under the control of the low-level signal.

13. The display panel according to claim 12, characterized in that, The light-emitting device includes a first light-emitting device and a second light-emitting device with different colors, wherein the luminous efficiency of the first light-emitting device is less than that of the second light-emitting device. The low-level signal includes a first low-level signal and a second low-level signal, wherein the voltage value of the first low-level signal is less than the voltage value of the second low-level signal. The comparison module in the pixel circuit coupled to the first light-emitting device receives the first low-level signal, and the comparison module in the pixel circuit coupled to the second light-emitting device receives the second low-level signal.

14. The display panel according to claim 1, characterized in that, The display panel includes a step signal line and a data signal line. The step signal line provides the step signal, and the data signal line provides the data signal. The step signal line extends along a first direction, and the data signal line extends along a second direction. The first direction and the second direction intersect. The plurality of pixel circuits arranged in the first direction are coupled to the same step signal line, and the plurality of pixel circuits arranged in the second direction are coupled to the same data signal line.

15. The display panel according to claim 1, characterized in that, The pixel circuit further includes a second transistor, the control terminal of which receives a first scan signal, the first electrode of which receives the data signal, and the second electrode of which is coupled to the first input terminal of the comparison module.

16. The display panel according to claim 15, characterized in that, The pixel circuit includes a first capacitor, one plate of which is coupled to the first power supply terminal, and the other plate is coupled to the control terminal of the first transistor. And / or, the pixel circuit includes a second capacitor, one plate of which is coupled to the first power supply terminal and the other plate is coupled to the first input terminal of the comparison module.

17. The display panel according to claim 15, characterized in that, The pixel circuit further includes a third transistor connected between the first transistor and the light-emitting device. The control terminal of the third transistor receives a second scan signal. The pulse width of the enable signal in the second scan signal is greater than the pulse width of the enable signal in the first scan signal.

18. The display panel according to claim 15, characterized in that, The pixel circuit also includes a fourth transistor and a fifth transistor; The control terminal of the fourth transistor receives the third scan signal, the first terminal of the fourth transistor receives the data signal, and the second terminal of the fourth transistor is coupled to the control terminal of the fifth transistor; the fifth transistor is electrically connected between the first power supply terminal and the first transistor; the pulse width of the enable signal in the first scan signal is greater than the pulse width of the enable signal in the third scan signal.

19. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 18.

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