Display panel and display device

Abstract

Embodiments of the present application provide a display panel and a display device. The display panel comprises a light emitting device, a pixel circuit and a comparison module; the pixel circuit comprises a driving transistor and a first transistor, and the first transistor and the driving transistor are connected in series; the comparison module is coupled with the gate of the first transistor, and the comparison module is configured to compare the voltage values of a comparison signal and a reference signal to generate a control signal, and provide the control signal to the gate of the first transistor; the working period of the pixel circuit comprises a light emitting stage; in the light emitting stage, the comparison signal is a constant voltage signal, and the voltage of the reference signal changes with time at least in part time period. The present application can adjust the light emitting time length of the light emitting device by using the comparison module, realize flexible adjustment of the light emitting time length of each different color light emitting device, and meet the application requirements of multiple scenes.

Description

Technical Field

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

[0002] Micro-LEDs (micro light-emitting diodes) are widely used in the display field due to their numerous advantages, including high brightness, low power consumption, fast response time, small size, and long lifespan. Furthermore, Micro-LEDs are typically only tens to hundreds of micrometers in size, allowing for very high pixel densities by using each Micro-LED as an individual light-emitting unit. However, existing pixel circuits cannot control the duration of emission of Micro-LEDs. Summary of the Invention

[0003] This invention provides a display panel and a display device to solve the problem in the prior art that the duration of light emission of light-emitting devices cannot be controlled.

[0004] In a first aspect, embodiments of the present invention provide a display panel, including a light-emitting device, a pixel circuit, and a comparison module;

[0005] The pixel circuit and the light-emitting device are coupled together. The pixel circuit includes a driving transistor and a first transistor, which are connected in series.

[0006] The comparison module is coupled to the gate of the first transistor. The comparison module is used to compare the voltage values ​​of the comparison signal and the reference signal to generate a control signal and provide the control signal to the gate of the first transistor.

[0007] The operating cycle of a pixel circuit includes an emission phase; during the emission phase, the comparison signal is a constant voltage signal, and the voltage of the reference signal changes with time for at least a portion of the time.

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

[0009] The display panel and display device provided in this invention have the following beneficial effects: The comparison module controls the on-time of the first transistor by comparing the voltage magnitudes of the comparison signal and the reference signal, thereby controlling the light-emitting duration of the light-emitting device. By adjusting the light-emitting duration of the light-emitting device using the comparison module, and by designing the comparison signal and / or reference signal corresponding to different color light-emitting devices, different color light-emitting devices can have different light-emitting durations, achieving flexible adjustment of the light-emitting duration of each different color light-emitting device to meet the application needs of multiple scenarios. In some application scenarios, such as high-temperature environments or long-term use, the brightness of the light-emitting device can be compensated by adjusting the light-emitting duration, thereby improving the color shift problem. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0011] Figure 1 A schematic diagram of a display panel circuit is provided for 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 circuit diagram of another display panel provided in an embodiment of the present invention;

[0014] Figure 4 A circuit diagram of another display panel provided in an embodiment of the present invention;

[0015] Figure 5 A circuit diagram of another display panel provided in an embodiment of the present invention;

[0016] Figure 6 A circuit diagram of another display panel provided in an embodiment of the present invention;

[0017] Figure 7 A circuit diagram of another display panel provided in an embodiment of the present invention;

[0018] Figure 8 A schematic diagram of a reference signal provided for an embodiment of the present invention;

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

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

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

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

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

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

[0025] Figure 15 A circuit diagram of another display panel provided in an embodiment of the present invention;

[0026] Figure 16 A circuit diagram of another display panel provided in an embodiment of the present invention;

[0027] Figure 17 This is a schematic diagram of another display panel provided in an embodiment of the present invention;

[0028] Figure 18 This is a schematic diagram of another display panel provided in an embodiment of the present invention;

[0029] Figure 19 This is a schematic diagram of another display panel provided in an embodiment of the present invention;

[0030] Figure 20 A circuit diagram of another display panel provided in an embodiment of the present invention;

[0031] Figure 21 A circuit diagram of another display panel provided in an embodiment of the present invention;

[0032] Figure 22 This is a schematic diagram of a display device provided in an embodiment of the present invention. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0035] 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.

[0036] Different colored LEDs use different luminescent materials and have different luminous efficiencies, and the degree to which their luminous efficiency is affected by temperature also varies. For example, when a display product is used for a long time, causing the temperature to rise, or when it is used at relatively high temperatures, the luminous efficiency will decrease, resulting in insufficient brightness and thus color deviation. In related technologies, different colored LEDs are driven by the same pixel circuit, making it impossible to adjust the emission duration of the LEDs individually. Since the emission duration affects the brightness of the LEDs, the current technology cannot compensate for the brightness of the LEDs by adjusting the emission duration.

[0037] To address the problems existing in related technologies, embodiments of the present invention provide a display panel in which a comparison module is connected to the gate of a first transistor. The turn-on duration of the first transistor is controlled by comparing the voltages of a comparison signal and a reference signal, thereby controlling the light-emitting duration of the light-emitting device. This achieves adjustment of the light-emitting duration of the light-emitting device, meeting the requirements for light-emitting duration in different application scenarios.

[0038] Figure 1 A schematic diagram of a display panel circuit is provided for an embodiment of the present invention, such as... Figure 1 As shown, the display panel includes a light-emitting device 10 and a pixel circuit 20. The pixel circuit 20 includes a driving transistor T1 and a first transistor T2, which are connected in series. Figure 1 The diagram illustrates the connection of the first transistor T2 between the driving transistor T1 and the light-emitting device 10. Figure 1The source of the driving transistor T1 receives a first power supply voltage V1, and its drain is connected to the first transistor T2. The first electrode of the light-emitting device 10 is coupled to the first transistor T2, and its second electrode receives a second power supply voltage V2. Optionally, the first power supply voltage V1 is a positive power supply voltage, and the second power supply voltage V2 is a negative power supply voltage. The light-emitting device 10 is an inorganic light-emitting diode, such as a Micro-LED or Mini-LED. Since the first transistor T2 and the driving transistor T1 are connected in series, the turn-on duration of the first transistor T2 affects the conduction duration of the pixel circuit 20 and the light-emitting device 10, and thus affects the light-emitting duration of the light-emitting device 10.

[0039] Figure 1 The pixel circuit 20 is only shown in a simplified diagram. The pixel circuit 20 also includes a data writing transistor T3. The gate of the data writing transistor T3 receives the scan signal Scan, and the source receives the data signal Vdata. The drain of the data writing transistor T3 is coupled to the gate of the driving transistor T1. Each transistor in the pixel circuit 20 is illustrated as a p-type transistor. In another embodiment, each transistor in the pixel circuit 20 is an n-type transistor.

[0040] like Figure 1 As shown, the display panel also includes a comparison module 30. The comparison module 30 is coupled to the gate of the first transistor T2. The comparison module 30 compares the voltage values ​​of the comparison signal Vp and the reference signal Vc to generate a control signal and provides the control signal to the gate of the first transistor T2. That is, the control signal controls the on / off state of the first transistor T2. For example, when Vp-Vc is less than a threshold, the comparison module 30 can provide a valid level signal to the gate of the first transistor T2, which controls the first transistor T2 to turn on. When Vp-Vc is greater than the threshold, the comparison module 30 can provide an invalid level signal to the gate of the first transistor T2, which controls the first transistor T2 to turn off. Alternatively, it can provide a valid level signal when Vp-Vc is greater than the threshold and an invalid level signal when Vp-Vc is less than the threshold. The threshold can be 0V, or a positive or negative value; the specific threshold value can be set according to the structure of the comparison module 30.

[0041] In the display panel, pixel circuits 20 are arranged in multiple rows, and each row is driven sequentially to achieve display. Each pixel circuit 20 operates once during the display of one frame, so the working cycle of the pixel circuit 20 is the refresh time of one frame. During the refresh time of one frame, all pixel circuit rows are driven sequentially once. The working cycle of the pixel circuit 20 includes a light-emitting phase, during which the driving transistor T1 can be turned on. When the first transistor T2 is also turned on, a voltage difference is formed between the first electrode and the second electrode of the light-emitting device 10, controlling the light-emitting device 10 to emit light.

[0042] Figure 2 This is a timing diagram of the light emission stage provided in an embodiment of the present invention. For example... Figure 2 As shown, during the light-emitting stage t1, the comparison signal Vp is a constant voltage signal, while the voltage of the reference signal Vc varies with time, at least for a portion of the time. During the light-emitting stage t1, t... 1-1 During the time period, the voltage value of the comparison signal Vp is less than the voltage value of the reference signal Vc, and the other t 1-2 During the time period, the voltage value of the comparison signal Vp is greater than the voltage value of the reference signal Vc.

[0043] Taking the example of the control signal output by the comparison module 30 controlling the first transistor T2 to turn on when Vp-Vc is less than the threshold, and the control signal output by the comparison module 30 controlling the first transistor T2 to turn off when Vp-Vc is greater than the threshold.

[0044] During time period t 1-1 When Vp-Vc is less than the threshold, the comparison module 30 provides a valid level signal to the gate of the first transistor T2, turning on the first transistor T2 and causing the driving transistor T1 to conduct with the light-emitting device 10, which then emits light. During time period t... 1-2 When Vp-Vc exceeds the threshold, the comparator module 30 provides an inactive level signal to the gate of the first transistor T2, turning off the first transistor T2. At this time, the light-emitting device 10 does not emit light. (Time period t) 1-1 The time period t is the period during which the light-emitting device 10 emits light. 1-2 The time period t is when the light-emitting device 10 does not emit light. 1-1 This determines the light-emitting duration of the light-emitting device 10. For example, when the waveform of the reference signal Vc remains unchanged, changing the voltage of the comparison signal Vp can adjust the light-emitting duration of the light-emitting device 10.

[0045] To explain the principles behind this case, Figure 2 The timing diagram illustrates that the emission and non-emission periods in the emission phase t1 are defined by the moment when Vp = Vc, i.e., the threshold is equivalent to 0V. In some implementations, the threshold can be greater than 0V or less than 0V.

[0046] In the display panel provided in this embodiment of the invention, a comparison module 30 is connected to the gate of a first transistor T2. The comparison module 30 controls the on-time of the first transistor T2 by comparing the voltage magnitudes of the comparison signal Vp and the reference signal Vc, thereby controlling the light-emitting duration of the light-emitting device 10. By adjusting the light-emitting duration of the light-emitting device 10 using the comparison module 30, and by designing the comparison signal Vp and / or the reference signal Vc corresponding to different colored light-emitting devices 10, different colored light-emitting devices 10 can have different light-emitting durations, achieving flexible adjustment of the light-emitting duration of each different colored light-emitting device 10 to meet the application needs of multiple scenarios. In some application scenarios, such as high-temperature environments or long-term use, the brightness of the light-emitting device 10 can be compensated by adjusting the light-emitting duration, thereby improving the color shift problem.

[0047] In some embodiments, the comparison module 30 is a voltage comparator. The voltage comparator can be any structure in the prior art capable of implementing voltage comparison; the structure of the voltage comparator is not illustrated in the accompanying drawings. In other embodiments, Figure 3 A circuit diagram of another display panel provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the comparison module 30 includes a comparison transistor T4, whose gate and source each receive a comparison signal Vp and a reference signal Vc, respectively. The comparison transistor T4 determines its operating state by comparing the voltage difference between its gate and source. When the comparison transistor T4 is turned on, its drain outputs a control signal to the gate of the first transistor T2, thereby controlling the on-time of the first transistor T2. The simple structure of the comparison transistor T4 allows the comparison module 30 to occupy less space in the display panel and has less impact on other circuit wiring in the display panel. Furthermore, the comparison transistor T4 can be fabricated using the same process as the transistors in the pixel circuit 20, without requiring additional process steps. In some embodiments, such as... Figure 3As shown in the figure, the comparison transistor T4 is a p-type transistor, the gate of the comparison transistor T4 receives a comparison signal Vp, and the source thereof receives a reference signal Vc. The threshold voltage of the comparison transistor T4 is Vth. When Vp-Vc<Vth, the comparison transistor T4 is turned on, and the drain of the comparison transistor T4 provides a voltage to the gate of the first transistor T2. When the turn-on condition of the first transistor T2 is satisfied, the first transistor T2 is turned on, so that the driving transistor T1 and the light-emitting device 10 are conductive. It can be understood that in order to satisfy the turn-on condition of the first transistor T2, Vp-Vc<the threshold is required. In practice, the threshold may not be equal to Vth, and the specific threshold is related to the characteristics of the first transistor T2. However, the turn-on of the first transistor T2 is at least premised on the turn-on of the comparison transistor T4, that is, the turn-on duration of the first transistor T2 can be controlled by controlling the turn-on duration of the comparison transistor T4, thereby controlling the light-emitting duration of the light-emitting device 10.

[0048] In some other embodiments, the comparison transistor T4 is an n-type transistor, which will not be illustrated with drawings herein. For example, the gate of the comparison transistor T4 receives a comparison signal Vp, and the source thereof receives a reference signal Vc. The threshold voltage of the comparison transistor T4 is Vth, when Vp-Vc>Vth, the comparison transistor T4 is turned on to provide a voltage to the gate of the first transistor T2. When the turn-on condition of the first transistor T2 is satisfied, the first transistor T2 is turned on, so that the driving transistor T1 and the light-emitting device 10 are conductive. Thereby, the turn-on duration of the first transistor T2 can be controlled, and the light-emitting duration of the light-emitting device 10 can be further controlled.

[0049] In some embodiments, Figure 4 is a circuit schematic diagram of another display panel provided by an embodiment of the present invention, as Figure 4As shown, driving transistor T1 is connected in series between first transistor T2 and first control transistor T6. One electrode of first control transistor T6 receives a first power supply voltage V1, and its gate receives a first control signal Em1. Gate reset transistor T5 receives a reset signal Vref at its first electrode and is connected to first node N1 at its second electrode. Its gate receives a first scan signal Scan1. Data writing transistor T3 is connected to second node N2. Threshold compensation transistor T4 is connected in series between first node N1 and third node N3. The gates of data writing transistor T3 and threshold compensation transistor T4 receive a second scan signal Scan2. Pixel circuit 20 also includes storage capacitor Cst. One plate of storage capacitor Cst receives the first power supply voltage V1, and its other plate is connected to first node N1. During the light-emitting phase, when first control transistor T6, driving transistor T1, and first transistor T2 are all turned on, pixel circuit 20 provides voltage to the first electrode of light-emitting device 10, and light-emitting device 10 emits light. The on-time of first control transistor T6 is controlled by the first control signal Em1. In this embodiment, the on-time of the first control transistor T6 during the operating cycle of the pixel circuit 20 is greater than or equal to the on-time of the first transistor T2. In other words, the effective level pulse width of the first control signal Em1 during the operating cycle of the pixel circuit 20 is greater than or equal to the effective level pulse width provided by the comparison module 30. In some embodiments, the initial on-time of the first control transistor T6 during the operating cycle of the pixel circuit 20 is earlier than the initial on-time of the first transistor T2.

[0050] In other implementations, Figure 5 A circuit diagram of another display panel provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the gate of the first control transistor T6 is connected to the comparison module 30, that is, the comparison module 30 controls the first transistor T2 and the first control transistor T6 simultaneously.

[0051] In other implementations, Figure 6 A circuit diagram of another display panel provided in an embodiment of the present invention, as shown below. Figure 6 As shown, the first transistor T2 is connected to the first power supply terminal. Figure 6Between the first terminal of the driving transistor T1 (not shown) and the first terminal of the pixel circuit 20, a first power supply voltage V1 is provided at the first power supply terminal. The second terminal of the driving transistor T1 is coupled to the light-emitting device 10 through the second control transistor T7. The gate of the second control transistor T7 receives the second control signal Em2. During the light-emitting phase, when the first transistor T2, the driving transistor T1, and the second control transistor T7 are all turned on, the pixel circuit 20 provides a voltage to the first electrode of the light-emitting device 10, and the light-emitting device 10 emits light. In this embodiment, the on-time of the second control transistor T7 during the operating cycle of the pixel circuit 20 is greater than or equal to the on-time of the first transistor T2. In other words, the effective level pulse width of the second control signal Em2 during the operating cycle of the pixel circuit 20 is greater than or equal to the effective level pulse width provided by the comparison module 30. In some embodiments, the initial on-time of the second control transistor T7 during the operating cycle of the pixel circuit 20 is earlier than the initial on-time of the first transistor T2.

[0052] In some embodiments of the present invention, the first transistor T2 is connected between the driving transistor T1 and the light-emitting device 10. In other embodiments, the first transistor T2 is connected between the driving transistor T1 and the first power supply terminal. The accompanying drawings of the following related embodiments are only illustrated with the first transistor T2 connected between the driving transistor T1 and the light-emitting device 10.

[0053] In some implementations... Figure 7 Another schematic diagram of a display panel circuit provided in an embodiment of the present invention is shown below. Figure 7 As shown, the light-emitting device 10 includes a first light-emitting device 11 and a second light-emitting device 12 with different colors. The pixel circuit 20 includes a first pixel circuit 21 coupled to the first light-emitting device 11 and a second pixel circuit 22 coupled to the second light-emitting device 12. The comparison module 30 includes a first comparison module 31 and a second comparison module 32. The first comparison module 31 is coupled to a first transistor T2 in the first pixel circuit 21, and the second comparison module 32 is coupled to a first transistor T2 in the second pixel circuit 22.

[0054] In this configuration, the first comparison module 31 receives a first comparison signal Vp-1, and the second comparison module 32 receives a second comparison signal Vp-2. The voltage values ​​of the first comparison signal Vp-1 and the second comparison signal Vp-2 are different. Both the first comparison module 31 and the second comparison module 32 receive the same reference signal Vc. This arrangement allows the first light-emitting device 11 and the second light-emitting device 12 to have different light-emitting durations, meeting the different light-emitting duration requirements of different color light-emitting devices 10. Furthermore, the fact that the first comparison module 31 and the second comparison module 32 receive the same reference signal Vc simplifies the signal supply method of the display driver chip, reduces the number of pins in the display driver chip, saves costs, and also simplifies the wiring in the display panel.

[0055] Figure 8 This is a schematic diagram of a reference signal provided in an embodiment of the present invention, where the horizontal axis represents time t and the vertical axis represents voltage V. Figure 8 The diagram illustrates that during the initial period of the light-emitting phase, the reference signal Vc is a constant voltage, which then gradually decreases over time. Taking the example that the first transistor T2 can be turned on when Vp-Vc is less than a threshold, the early stage of the light-emitting phase is the light-emitting period, and the later stage is the non-light-emitting period. Figure 8 It can be seen that the voltage value of the first comparison signal Vp-1 is less than the voltage value of the second comparison signal Vp-2. The time when Vp-1 = Vc is q1, and the time when Vp-2 = Vc is q2, and the time q2 is earlier than the time q1. That is, under the same conditions, the second comparison module 32 using the second comparison signal Vp-2 will control the first transistor T2 to turn off earlier, so the light emission duration of the first light-emitting device 11 will be greater than the light emission duration of the second light-emitting device 12.

[0056] In the display panel provided in this embodiment of the invention, a first comparison module 31 and a second comparison module 32 are respectively configured to receive comparison signals Vp with different voltage values ​​and a reference signal Vc with the same voltage. This enables the first light-emitting device 11 and the second light-emitting device 12 to have different light-emitting durations, satisfying the different light-emitting duration requirements of different color light-emitting devices 10. For example, if the luminous efficiency of the first light-emitting device 11 and the second light-emitting device 12 is different, the difference in luminous efficiency can be compensated by adjusting the light-emitting duration. Furthermore, the luminous efficiency of the first light-emitting device 11 and the second light-emitting device 12 decreases with increasing temperature, but the degree of decrease differs. By setting the voltage values ​​of the first comparison signal Vp-1 and the second comparison signal Vp-2 respectively, the light-emitting duration of the first light-emitting device 11 and the second light-emitting device 12 can be adjusted separately, allowing each to compensate for brightness and improve the color shift problem caused by reduced luminous efficiency.

[0057] Figure 8 The diagram illustrates one possible waveform for the reference signal Vc, which is equivalent to the reference signal Vc including a plateau signal and a ramp signal. The plateau signal is a constant voltage signal, and the voltage value of the ramp signal gradually decreases over time.

[0058] In some implementations... Figure 9 Another reference signal schematic diagram provided for an embodiment of the present invention, such as... Figure 9 As shown, the voltage value of the reference signal Vc gradually decreases over time. Taking the case where a valid level signal can be output to control the first transistor T2 to turn on when Vp-Vc is less than the threshold as an example, then... Figure 9When the reference signal Vc is provided in the embodiment, the early stage of the light emission phase is the light emission period, and the later stage is the non-light emission period. The smaller the comparison signal Vp, the longer the light emission duration.

[0059] In other implementations, Figure 10 Another reference signal schematic diagram provided for an embodiment of the present invention, such as... Figure 10 As shown, the voltage value of the reference signal Vc gradually increases over time. Taking the example of outputting an effective level signal to control the first transistor T2 to turn on when Vp-Vc is less than the threshold, the following method is used: Figure 10 When the reference signal Vc is provided in the embodiment, the early stage of the light emission phase is a non-light emission period, and the later stage is a light emission period. The smaller the comparison signal Vp, the shorter the non-light emission period, and the longer the corresponding light emission duration.

[0060] In some implementations... Figure 11 Another reference signal schematic diagram provided for an embodiment of the present invention, such as... Figure 11 As shown, the reference signal Vc includes at least one plateau signal H1 and at least one ramp signal H2. The plateau signal H1 is a constant voltage signal, and the voltage value of the ramp signal H2 gradually increases with time. Taking the example of outputting an effective level signal to control the first transistor T2 to turn on when Vp-Vc is less than a threshold, the following method is used... Figure 11 When the reference signal Vc is provided in the embodiment, the early stage of the light emission phase is the light emission period, and the later stage is the non-light emission period. Therefore, the smaller the comparison signal Vp, the longer the light emission duration.

[0061] In some embodiments, the reference signal Vc includes at least one plateau signal H1 and at least one ramp signal H2. The plateau signal H1 is a constant voltage signal, and the voltage value of the ramp signal H2 gradually decreases over time. These are not illustrated in the accompanying drawings.

[0062] In some implementations... Figure 12 Another reference signal schematic diagram provided for an embodiment of the present invention, such as... Figure 12 As shown, the reference signal Vc includes at least one plateau signal H1 and at least two ramp signals H2. The plateau signal H1 is a constant voltage signal, and the voltage value of at least one ramp signal H2 gradually decreases over time, while the voltage value of at least one ramp signal H2 gradually increases over time. Figure 12 The diagram illustrates that the voltage value of the first ramp signal H2 gradually increases over time, while the voltage value of the second ramp signal H2 gradually decreases over time. Taking the example of outputting a valid level signal to control the first transistor T2 to turn on when Vp-Vc is less than a threshold, the diagram uses... Figure 12 When the reference signal Vc is provided in the embodiment, the early stage of the light emission phase is a non-light emission period, the middle stage is a light emission period, and the later stage is a non-light emission period. The smaller the comparison signal Vp, the shorter the non-light emission period, and the longer the corresponding light emission duration.

[0063] In other implementations, Figure 13 Another reference signal schematic diagram provided for an embodiment of the present invention, such as... Figure 13 As shown, the reference signal Vc includes a plateau signal H1 and two ramp signals H2. The plateau signal H1 is a constant voltage signal. The voltage value of the first ramp signal H2 gradually decreases over time, while the voltage value of the second ramp signal H2 gradually increases over time. Taking the example of outputting an effective level signal to control the first transistor T2 to turn on when Vp-Vc is less than a threshold, the following method is used... Figure 13 When the reference signal Vc is provided in the embodiment, the early stage of the light emission phase is the light emission period, the middle stage is the non-light emission period, and the later stage is the light emission period. The smaller the comparison signal Vp, the longer the light emission period, and the longer the light emission duration.

[0064] Figures 9 to 13 The diagram illustrates several possible waveforms for the reference signal Vc during the light emission stage t1. Figure 9 and Figure 10 The voltage of the reference signal Vc varies linearly with time. In other embodiments, the voltage of the reference signal Vc varies non-linearly with time. Figure 14 Another reference signal schematic diagram provided for an embodiment of the present invention, such as... Figure 14 As shown in Figures A and B, the voltage of the reference signal Vc changes nonlinearly with time.

[0065] In some implementations, such as Figure 7 As shown, the emission wavelength of the first light-emitting device 11 is greater than that of the second light-emitting device 12. The first comparison module 31 and the second comparison module 32 receive the same reference signal Vc, and the voltage value of the first comparison signal Vp-1 is less than the voltage value of the second comparison signal Vp-2. For example, both the first comparison module 31 and the second comparison module 32 include p-type comparator transistors, combined with... Figure 8 As shown in the schematic timing diagram, when the variation law of the reference signal Vc over time is determined, the smaller the voltage value of the comparison signal Vp, the longer the light emission period in the light emission stage, and thus the longer the light emission duration of the light-emitting device. This embodiment of the invention enables the light emission duration of the first light-emitting device 11 to be greater than that of the second light-emitting device 12, thereby compensating for the difference in luminous efficiency between the two by adjusting the light emission duration.

[0066] In this application, the first light-emitting device 11 emits red light, and the second light-emitting device 12 emits green or blue light. For example, if the first light-emitting device 11 is red and the second light-emitting device 12 is green, the voltage value of the first comparison signal Vp-1 is set to be less than the voltage value of the second comparison signal Vp-2. This allows the light-emitting duration of the red light-emitting device to be longer than that of the green light-emitting device, thus compensating for the difference in luminous efficiency between the two by increasing the light-emitting duration of the red device. Furthermore, this approach can meet the different light-emitting duration requirements of different colored light-emitting devices.

[0067] In some implementations... Figure 15 A circuit diagram of another display panel provided in an embodiment of the present invention, as shown below. Figure 15 As shown, the light-emitting device 10 includes a first light-emitting device 11, a second light-emitting device 12, and a third light-emitting device 13, each with a different color. The emission wavelength of the first light-emitting device 11 is greater than that of the second light-emitting device 12, and the emission wavelength of the third light-emitting device 13 is less than that of the second light-emitting device 12. The third light-emitting device 13 is coupled to a third pixel circuit 23, and a third comparison module 33 is coupled to a first transistor T2 in the third pixel circuit 23. All three comparison modules 30 receive the same reference signal Vc. The first comparison module 31 receives a first comparison signal Vp-1, the second comparison module 32 receives a second comparison signal Vp-2, and the third comparison module 33 receives a third comparison signal Vp-3. The voltage value of the first comparison signal Vp-1 is less than the voltage value of the second comparison signal Vp-2, and the voltage value of the third comparison signal Vp-3 is greater than the voltage value of the second comparison signal Vp-2. Figure 8 As shown in the schematic timing diagram, the design of this embodiment of the invention enables the first light-emitting device 11 to have a longer light-emitting duration than the second light-emitting device 12, and the second light-emitting device 12 to have a longer light-emitting duration than the third light-emitting device 13. The light-emitting durations of the three colors of light-emitting devices are individually set based on their luminous efficiency differences.

[0068] In one embodiment, the first light-emitting device 11 is a red light-emitting device, the second light-emitting device 12 is a green light-emitting device, and the third light-emitting device 13 is a blue light-emitting device.

[0069] In other embodiments, the comparator transistor T4 is an n-type transistor, the emission wavelength of the first light-emitting device 11 is greater than the emission wavelength of the second light-emitting device 12, and the emission wavelength of the third light-emitting device 13 is less than the emission wavelength of the second light-emitting device 12. Specifically, the voltage value of the first comparison signal Vp-1 is greater than the voltage value of the second comparison signal Vp-2, and the voltage value of the third comparison signal Vp-3 is less than the voltage value of the second comparison signal Vp-2.

[0070] In some implementations... Figure 16 A circuit diagram of another display panel provided in an embodiment of the present invention, as shown below. Figure 16 As shown, the light-emitting device 10 includes a first light-emitting device 11, a second light-emitting device 12, and a third light-emitting device 13, each with a different color. The emission wavelength of the first light-emitting device 11 is greater than that of the second light-emitting device 12, and the emission wavelength of the third light-emitting device 13 is less than that of the second light-emitting device 12. The display panel is equipped with a first comparison module 31, a second comparison module 32, and a third comparison module 33, all of which receive the same reference signal Vc. Specifically, the first comparison module 31 receives a first comparison signal Vp-1, while the second and third comparison modules 32 and 33 receive a second comparison signal Vp-2. When the difference in luminous efficiency between the second light-emitting device 12 and the third light-emitting device 13 is relatively small, the second and third comparison modules 32 and 33 can share a single comparison signal, thus making the emission duration of the second light-emitting device 12 equal to that of the third light-emitting device 13. This embodiment enables synchronous adjustment of the emission duration of the second light-emitting device 12 and the third light-emitting device 13, and also reduces the number of wiring lines providing the comparison signal, saving wiring space on the display panel.

[0071] In some embodiments, the display panel operates in two modes: a first mode and a second mode. The light-emitting device 10 includes a first light-emitting device 11, which is coupled to a first pixel circuit 21. A first comparison module 31 is coupled to a first transistor T2 in the first pixel circuit 21. The first comparison module 31 receives a first comparison signal Vp-1; the voltage value of the first comparison signal Vp-1 in the first mode is greater than its voltage value in the second mode. As temperature increases, the luminous efficiency of the light-emitting device 10 decreases, leading to a decrease in brightness and consequently, color shift. This embodiment of the invention sets the magnitude of the first comparison signal Vp-1 for the first mode and the second mode at different operating temperatures, enabling the first light-emitting device 11 to have different emission durations in different operating modes to meet the brightness requirements of different modes. Figure 8 As can be understood from the timing diagram and related descriptions, the embodiments of the present invention can achieve a longer light-emitting duration for the first light-emitting device 11 in the second mode than in the first mode. Optionally, the operating temperature of the display panel in the first mode is lower than that in the second mode, that is, the light-emitting duration of the first light-emitting device 11 is increased in the high-temperature mode, thereby improving the brightness of the first light-emitting device 11 in the high-temperature mode to compensate for the decrease in brightness caused by the reduction in luminous efficiency, thereby improving the problem of color deviation in the high-temperature mode.

[0072] In applications, the second mode can be the operating mode switched after the display panel has been working for a long time. After the display panel has been working for a long time, its operating temperature rises, and the corresponding first mode can be considered the mode when the display panel is working for a shorter period of time. For example, if the display panel is equipped with a temperature monitoring module, when it detects that the operating temperature of the display panel is higher than a set temperature threshold, it controls the display panel to switch to the second mode.

[0073] Optionally, the second mode can be considered as the high-temperature operating mode of the display panel, while the first mode is the low-temperature operating mode of the display panel. For example, when the ambient temperature is higher than the temperature threshold, the display panel switches to the second mode; when the ambient temperature is lower than the temperature threshold, the display panel switches to the first mode.

[0074] In other implementations, the brightness requirements for the display panel differ between the first mode and the second mode.

[0075] In some implementations, the driving frequencies of the display panel differ between the first mode and the second mode, resulting in different frame refresh times for the display panel in the first and second modes, and consequently, different scan times allocated to each pixel row. The design of this invention enables the light-emitting device to emit light for different durations in the two modes, thus meeting the requirements for pixel row scan times in different modes.

[0076] In some embodiments, the light-emitting device 10 includes a first light-emitting device 11 and a second light-emitting device 12. For example... Figure 7 As shown, a first light-emitting device 11 is correspondingly provided with a first comparison module 31, and a second light-emitting device 12 is correspondingly provided with a second comparison module 32. The first comparison module 31 receives a first comparison signal Vp-1, and the second comparison module 32 receives a second comparison signal Vp-2. The voltage value of the first comparison signal Vp-1 in the first mode is greater than its voltage value in the second mode, and the voltage value of the second comparison signal Vp-2 in the first mode is greater than its voltage value in the second mode. The absolute value of the difference between the voltage values ​​of the first comparison signal Vp-1 in the first mode and the second mode is Δ1, and the absolute value of the difference between the voltage values ​​of the second comparison signal Vp-2 in the first mode and the second mode is Δ2, where Δ1 > Δ2. Combined with... Figure 8 As can be seen from the timing diagram and related explanations, when the variation law of the reference signal Vc is determined, the smaller the voltage value of the comparison signal Vp and the longer the emission duration, the greater the degree of change in the voltage value of the comparison signal Vp and the greater the degree of increase in the emission duration.

[0077] In this embodiment, the first light-emitting device 11 and the second light-emitting device 12 emit different colors, have different luminous efficiencies, and exhibit different degrees of luminous efficiency reduction in the second mode. By setting △1 > △2, compared to the first mode, the increase in the light-emitting duration of the first light-emitting device 11 in the second mode is greater than the increase in the light-emitting duration of the second light-emitting device 12. Therefore, by increasing the light-emitting duration, different degrees of brightness compensation can be applied to the first light-emitting device 11 and the second light-emitting device 12 in the second mode, compensating for the brightness reduction caused by the decrease in luminous efficiency at high temperatures, thereby improving the color shift problem in high-temperature modes.

[0078] In other embodiments, the voltage value of the second comparison signal Vp-2 in the first mode is equal to its voltage value in the second mode. That is, when the difference in luminous efficiency between the second light-emitting device 12 in the first and second modes is small, only one second comparison signal Vp-2 can be set for both modes. The light-emitting duration of the second light-emitting device 12 is set to be the same in both modes, while the light-emitting duration of the first light-emitting device 11 in the second mode is longer than its light-emitting duration in the first mode. When switching between the first and second modes, the magnitude of the first comparison signal Vp-1 needs to be switched, but the magnitude of the second comparison signal Vp-2 does not need to be changed, thus simplifying the driving method of the display panel. Optionally, the first light-emitting device 11 is a red light-emitting device, and the second light-emitting device 12 is a green or blue light-emitting device.

[0079] In some implementations... Figure 17 This is another schematic diagram of a display panel provided in an embodiment of the present invention, such as... Figure 17 As shown, the comparison module 30 is configured in a one-to-one correspondence with the pixel circuit 20. The pixel circuit 20 includes at least a driving transistor T1 and a first transistor T2. In this embodiment, the comparison module 30 corresponds one-to-one with the light-emitting device 10, that is, each light-emitting device 10 is provided with a comparison module 30 for adjusting the light-emitting duration, which can independently adjust the light-emitting duration of each light-emitting device 10, so that the light emission of each light-emitting device 10 is independent and unrelated to each other.

[0080] Optionally, the comparison module 30 is located within the display area. The comparison module 30 includes a comparison transistor T4, which is fabricated in the same process as the transistors in the pixel circuit 20.

[0081] like Figure 17 As shown, the display panel includes a reference signal line Vc extending along a first direction x. The reference signal line Vc provides a reference signal Vc. To simplify the marking method, Figure 17The reference signal line and the reference signal use the same marking. Multiple pixel circuits 20 are arranged in a pixel circuit row 20H along a first direction x. Multiple comparison modules 30 coupled to a pixel circuit row 20H share a single reference signal line Vc. In this embodiment of the invention, multiple comparison modules can share the reference signal Vc, which not only reduces wiring in the display panel but also reduces the number of pins on the display driver chip, thus reducing manufacturing costs.

[0082] like Figure 17 As shown, the display panel includes a comparison signal line Vp extending along a first direction x, the comparison signal Vp line providing the comparison signal Vp; to simplify the marking method, Figure 17 The comparison signal lines and comparison signals use the same markings; for example, the first comparison signal line Vp-1 provides the first comparison signal Vp-1. The display panel also includes scan lines (…). Figure 17 (Not shown), the scan line drives the pixel circuit row 20H, extending along a first direction x. The pixel circuit row 20H arranged along the first direction x includes multiple pixel circuits 20 coupled to a light-emitting device 10 of the same color, and multiple comparison modules 30 coupled to these multiple pixel circuits 20 share a single comparison signal line Vp. For example... Figure 17 As illustrated, the first pixel circuit 21 is coupled to the first light-emitting device 11, and multiple comparison modules 30, which are coupled to multiple first pixel circuits 21 in pixel circuit row 20H, are coupled to a first comparison signal line Vp-1. In this embodiment, a comparison signal line Vp simultaneously controls the light-emitting duration of multiple light-emitting devices 10 of the same color driven by a pixel circuit row, and the turn-on duration of multiple first transistors T2 driving the light-emitting devices 10 of the same color is equal. To facilitate wiring, corresponding comparison signal lines Vp can be set row by row according to pixel circuit row 20H. The comparison signal line Vp can be directly provided by the display driver chip, that is, the display driver chip sets an output pin, and the comparison signal line Vp is electrically connected to the output pin. Alternatively, a shift driving circuit can be set on the display panel, and the comparison signal line Vp is electrically connected to the shift register in the shift driving circuit.

[0083] like Figure 17As shown, the comparison signal line Vp includes a first comparison signal line Vp-1 and a second comparison signal line Vp-2. The first comparison signal line Vp-1 provides the first comparison signal Vp-1, and the second comparison signal line Vp-2 provides the second comparison signal Vp-2. The first light-emitting device 11 is coupled to the first pixel circuit 21, the second light-emitting device 12 is coupled to the second pixel circuit 22, and the third light-emitting device 13 is coupled to the third pixel circuit 23. The first comparison module 31 is coupled to the first transistor T2 in the first pixel circuit 21, the second comparison module 32 is coupled to the first transistor T2 in the second pixel circuit 22, and the third comparison module 33 is coupled to the first transistor T2 in the third pixel circuit 23. In this configuration, a pixel circuit row 20H includes multiple first pixel circuits 21, and multiple first comparison modules 31 coupled to the multiple first pixel circuits 21 share a first comparison signal line Vp-1. A pixel circuit row 20H also includes multiple second pixel circuits 22 and multiple third pixel circuits 23, and multiple second comparison modules 32 coupled to the multiple second pixel circuits 22 and multiple third comparison modules 33 coupled to the multiple third pixel circuits 23 share a second comparison signal line Vp-2. When a pixel circuit row 20H simultaneously includes first pixel circuits 21, second pixel circuits 22, and third pixel circuits 23, only two comparison signal lines Vp are needed for each pixel circuit row 20H, reducing the number of wires in the display panel and saving wiring space.

[0084] In other embodiments, the comparison signal line Vp includes a first comparison signal line, a second comparison signal line, and a third comparison signal line, each providing a different voltage value for the comparison signal. Multiple first comparison modules coupled to the same pixel circuit row share a single first comparison signal line, multiple second comparison modules coupled to the same pixel circuit row share a single second comparison signal line, and multiple third comparison modules coupled to the same pixel circuit row share a single third comparison signal line. Further details are not illustrated in the accompanying drawings.

[0085] In some implementations... Figure 18 This is another schematic diagram of a display panel provided in an embodiment of the present invention, such as... Figure 18 As shown, multiple pixel circuits 20 are arranged in a pixel circuit row 20H along a first direction x. The pixel circuit row 20H includes multiple pixel circuits 20 coupled to the same color light-emitting device 10, and these multiple pixel circuits 20 are coupled to the same comparison module 30. This arrangement ensures that the turn-on duration of the first transistor T2 connected to the same color light-emitting device 10 is equal, thus ensuring that the light-emitting duration of the same color light-emitting device 10 is the same. Furthermore, it reduces the number of comparison modules 30, saving wiring space on the display panel.

[0086] like Figure 18As shown, the light-emitting device 10 includes a first light-emitting device 11, a second light-emitting device 12, and a third light-emitting device 13, each with a different color. The pixel circuit 20 includes a first pixel circuit 21 coupled to the first light-emitting device 11, a second pixel circuit 22 coupled to the second light-emitting device 12, and a third pixel circuit 23 coupled to the third light-emitting device 13. In pixel circuit row 20H, multiple first pixel circuits 21 are coupled to a first comparison module 31, and multiple second pixel circuits 22 and multiple third pixel circuits 23 are coupled to a second comparison module 32. When pixel circuit row 20H simultaneously includes first pixel circuit 21, second pixel circuit 22, and third pixel circuit 23, only two comparison modules 30 need to be set for each pixel circuit row 20H. This arrangement further reduces the number of comparison modules 30 and the number of comparison signal lines, thereby further saving wiring space on the display panel.

[0087] In some embodiments, the second pixel circuit 22 and the third pixel circuit 23 do not share the comparison module 30. That is, the second pixel circuit 22 is coupled to the second comparison module, and the third pixel circuit 23 is coupled to the third comparison module. The second comparison module is coupled to the second comparison signal line, and the third comparison module is coupled to the third comparison signal line. The voltage values ​​provided by the second comparison signal line and the third comparison signal line are different. (This is not illustrated in the accompanying drawings.)

[0088] In some implementations... Figure 19 This is another schematic diagram of a display panel provided in an embodiment of the present invention, such as... Figure 19 As shown, pixel circuit row 20H includes multiple pixel circuits 20 coupled to light-emitting devices 10 of the same color, and these multiple pixel circuits 20 are coupled to the same comparison module 30. The display panel includes a display area AA and a non-display area NA, and the comparison module 30 is located in the non-display area NA. In this embodiment, placing the comparison module 30 in the non-display area NA does not affect the arrangement of the pixel circuits 20 in the display area AA, and can ensure the uniformity of the transistor etching process. Moreover, setting two or three comparison modules 30 corresponding to one pixel circuit row 20H results in a relatively small number of comparison modules 30, and placing them in the non-display area NA has a relatively small impact on the wiring space of the non-display area NA.

[0089] like Figure 19As shown, the non-display area NA includes a first non-display area NA1 and a second non-display area NA2; in the first direction x, the first non-display area NA1 and the second non-display area NA2 are located on both sides of the display area AA; part of the comparison module 30 is located in the first non-display area NA1, and part of the comparison module 30 is located in the second non-display area NA2. That is, the comparison modules 30 are distributed in the non-display areas NA on both sides of the display area AA, which can balance the difference in the border width of the two non-display areas NA and improve the user experience.

[0090] In some implementations... Figure 20 A circuit diagram of another display panel provided in an embodiment of the present invention, as shown below. Figure 20 As shown, the comparison module 30 is coupled to the gate of the first transistor T2 via the first capacitor C1. In this embodiment, the switching state of the first transistor T2 is controlled by the voltage coupling effect of the first capacitor C1.

[0091] In other implementations, Figure 21 A circuit diagram of another display panel provided in an embodiment of the present invention, as shown below. Figure 21 As shown, the output terminal of the comparison module 30 and the gate of the first transistor T2 are both connected to one plate of the second capacitor C2, and the other plate of the second capacitor C2 is connected to the third voltage signal V3, which is a constant voltage signal. In this embodiment, the second capacitor C2 is used to stabilize the gate voltage of the first transistor T2.

[0092] Based on the same inventive concept, embodiments of the present invention also provide a display device. Figure 22 This is a schematic diagram of a display device provided in an embodiment of the present invention, such as... Figure 22 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, an electronic device such as a mobile phone, tablet, billboard, or vehicle display.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such 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 the present invention.

Claims

1. A display panel, characterized in that, Includes light-emitting devices, pixel circuits, and a comparison module; The pixel circuit is coupled to the light-emitting device, and the pixel circuit includes a driving transistor and a first transistor, wherein the first transistor and the driving transistor are connected in series. The comparison module is coupled to the gate of the first transistor. The comparison module is used to compare the voltage values ​​of the comparison signal and the reference signal to generate a control signal and provide the control signal to the gate of the first transistor. The working cycle of the pixel circuit includes a light-emitting phase; during the light-emitting phase, the comparison signal is a constant voltage signal, and the voltage of the reference signal changes with time for at least a portion of the time. The light-emitting device includes a first light-emitting device and a second light-emitting device with different colors, and the pixel circuit includes a first pixel circuit coupled to the first light-emitting device and a second pixel circuit coupled to the second light-emitting device. The comparison module includes a first comparison module and a second comparison module. The first comparison module is coupled to the first transistor in the first pixel circuit, and the second comparison module is coupled to the first transistor in the second pixel circuit. The comparison signal includes a first comparison signal and a second comparison signal with different voltage values. The first comparison module and the second comparison module receive the first comparison signal and the second comparison signal respectively. The first comparison module and the second comparison module receive the same reference signal.

2. The display panel according to claim 1, characterized in that, The emission wavelength of the first light-emitting device is greater than that of the second light-emitting device, and the voltage value of the first comparison signal is less than that of the second comparison signal.

3. The display panel according to claim 2, characterized in that, The light-emitting device further includes a third light-emitting device, the emission wavelength of which is less than that of the second light-emitting device; the pixel circuit includes a third pixel circuit coupled to the third light-emitting device. The comparison module includes a third comparison module, which is coupled to the first transistor in the third pixel circuit, and the third comparison module and the first comparison module receive the same reference signal. The comparison signal includes a third comparison signal, the third comparison module receives the third comparison signal, and the voltage value of the third comparison signal is greater than the voltage value of the second comparison signal.

4. The display panel according to claim 2, characterized in that, The first light-emitting device emits red light, and the second light-emitting device emits green or blue light.

5. The display panel according to claim 1, characterized in that, The light-emitting device further includes a third light-emitting device, the emission wavelength of which is less than that of the second light-emitting device; the pixel circuit includes a third pixel circuit coupled to the third light-emitting device. The comparison module includes a third comparison module, which is coupled to the first transistor in the third pixel circuit, and the third comparison module and the first comparison module receive the same reference signal. The third comparison module receives the second comparison signal.

6. The display panel according to claim 1, characterized in that, The display panel has two operating modes: a first mode and a second mode. The pixel circuit includes a first pixel circuit coupled to the first light-emitting device; the comparison module includes a first comparison module, which is coupled to the first transistor in the first pixel circuit. The comparison signal includes a first comparison signal, which is received by the first comparison module; the voltage value of the first comparison signal in the first mode is greater than its voltage value in the second mode.

7. The display panel according to claim 6, characterized in that, The pixel circuit includes a second pixel circuit coupled to the second light-emitting device; the comparison module includes a second comparison module, which is coupled to the first transistor in the second pixel circuit. The comparison signal includes a second comparison signal, and the second comparison module receives the second comparison signal; the voltage value of the second comparison signal in the first mode is greater than or equal to its voltage value in the second mode; The absolute value of the difference between the voltage values ​​of the first comparison signal in the first mode and the second mode is △1, and the absolute value of the difference between the voltage values ​​of the second comparison signal in the first mode and the second mode is △2, wherein △1>△2.

8. The display panel according to claim 1, characterized in that, The comparison module is configured in a one-to-one correspondence with the pixel circuit.

9. The display panel according to claim 8, characterized in that, The display panel includes a reference signal line extending along a first direction, the reference signal line providing the reference signal; The plurality of pixel circuits are arranged in a pixel circuit row along the first direction, and the plurality of comparison modules coupled to one of the pixel circuit rows share a reference signal line.

10. The display panel according to claim 8, characterized in that, The display panel includes a comparison signal line extending along a first direction, the comparison signal line providing the comparison signal; The pixel circuit row includes multiple pixel circuits coupled to the light-emitting devices of the same color, and multiple comparison modules coupled to the multiple pixel circuits share a single comparison signal line.

11. The display panel according to claim 10, characterized in that, The comparison signal line includes a first comparison signal line and a second comparison signal line; The light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device with different colors; the pixel circuit includes a first pixel circuit coupled to the first light-emitting device, a second pixel circuit coupled to the second light-emitting device, and a third pixel circuit coupled to the third light-emitting device. The comparison module includes a first comparison module, a second comparison module, and a third comparison module. The first comparison module is coupled to the first transistor in the first pixel circuit, the second comparison module is coupled to the first transistor in the second pixel circuit, and the third comparison module is coupled to the first transistor in the third pixel circuit. A pixel circuit row includes a plurality of first pixel circuits, and a plurality of first comparison modules coupled to the plurality of first pixel circuits share a first comparison signal line; A pixel circuit row includes a plurality of second pixel circuits and a plurality of third pixel circuits, wherein a plurality of second comparison modules coupled to the plurality of second pixel circuits and a plurality of third comparison modules coupled to the plurality of third pixel circuits share a second comparison signal line.

12. The display panel according to claim 1, characterized in that, The plurality of said pixel circuits are arranged in a pixel circuit row along a first direction; The pixel circuit row includes a plurality of pixel circuits coupled to the light-emitting devices of the same color, and the plurality of pixel circuits are coupled to the same comparison module.

13. The display panel according to claim 12, characterized in that, The light-emitting device includes a first light-emitting device, a second light-emitting device, and a third light-emitting device with different colors; the pixel circuit includes a first pixel circuit coupled to the first light-emitting device, a second pixel circuit coupled to the second light-emitting device, and a third pixel circuit coupled to the third light-emitting device. The comparison module includes a first comparison module and a second comparison module. In the pixel circuit row, a plurality of first pixel circuits are coupled to a first comparison module, and in the pixel circuit row, a plurality of second pixel circuits and a plurality of third pixel circuits are coupled to a second comparison module.

14. The display panel according to claim 12, characterized in that, The display panel includes a display area and a non-display area, and the comparison module is located in the non-display area.

15. The display panel according to claim 1, characterized in that, The first transistor is connected between the driving transistor and the light-emitting device; or, the first transistor is connected between the first power supply terminal and the first terminal of the driving transistor, and the second terminal of the driving transistor is coupled to the light-emitting device.

16. The display panel according to claim 1, characterized in that, The comparison module includes a comparison transistor, wherein the gate and source of the comparison transistor receive the comparison signal and the reference signal, respectively.

17. The display panel according to claim 16, characterized in that, The comparator transistor is a p-type transistor, and its gate receives the comparison signal and its source receives the reference signal.

18. The display panel according to claim 1, characterized in that, During the emission phase, the voltage value of the reference signal changes over time in a manner that satisfies at least one of the following: The voltage value of the reference signal gradually decreases or gradually increases over time; The reference signal includes at least one plateau signal and at least one ramp signal. The plateau signal is a constant voltage signal, and the voltage value of the ramp signal gradually decreases or gradually increases over time. The reference signal includes at least one platform signal and at least two ramp signals. The platform signal is a constant voltage signal. The voltage value of at least one ramp signal gradually decreases over time, and the voltage value of at least one ramp signal gradually increases over time.

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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