Pixel circuit, display panel and display method of display panel

Abstract

The application discloses a pixel circuit, a display panel and a display method of the display panel. The pixel circuit comprises a driving sub-circuit, a light-emitting module and a temperature compensation sub-circuit; the driving sub-circuit and the light-emitting module are connected in series between a first power supply end and a second power supply end; the driving sub-circuit is used for generating a driving current in a light-emitting stage, and the light-emitting module is used for emitting light in response to the driving current; the temperature compensation sub-circuit is electrically connected with the first power supply end and the second power supply end, a data input end of the temperature compensation sub-circuit is connected with a temperature control voltage, and the temperature compensation sub-circuit is used for controlling the temperature of the light-emitting module according to the temperature control voltage before the light-emitting stage in a frame. The application can improve the use performance of the pixel circuit.

Description

Technical Field

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

[0002] With the development of display technology, the application of display panels is becoming more and more widespread, and the requirements for display panels are also getting higher and higher.

[0003] Pixel circuits, as an important component of display panels, have a significant impact on the display performance. However, the performance of pixel circuits in related technologies needs improvement. Summary of the Invention

[0004] This invention provides a pixel circuit, a display panel, and a display method for the display panel to improve the performance of the pixel circuit.

[0005] According to one aspect of the present invention, a pixel circuit is provided, the pixel circuit including a driving sub-circuit, a light-emitting module and a temperature compensation sub-circuit;

[0006] The driving sub-circuit and the light-emitting module are connected in series between the first power supply terminal and the second power supply terminal; the driving sub-circuit is used to generate a driving current during the light-emitting stage, and the light-emitting module is used to emit light in response to the driving current;

[0007] The temperature compensation sub-circuit is electrically connected to the first power supply terminal and the second power supply terminal. The data input terminal of the temperature compensation sub-circuit is connected to a temperature control voltage. The temperature compensation sub-circuit is used to control the temperature of the light-emitting module according to the temperature control voltage before the light-emitting stage within one frame.

[0008] Optionally, the pixel circuit further includes a temperature detection sub-circuit, which is used to detect the temperature of the light-emitting module;

[0009] The temperature control voltage corresponds to the temperature of the light-emitting module; wherein, if the temperature of the light-emitting module is less than a first temperature threshold, the temperature control voltage is a first preset value; if the temperature of the light-emitting module is greater than or equal to the first temperature threshold and less than a second temperature threshold, the temperature control voltage is a second preset value; if the temperature of the light-emitting module is greater than or equal to the second temperature threshold, the temperature control voltage is a third preset value; the first preset value is greater than the second preset value, and the second preset value is greater than the third preset value;

[0010] Preferably, the first temperature threshold and the second temperature threshold are determined by the correspondence between the temperature and brightness of the light-emitting module;

[0011] Preferably, the temperature detection sub-circuit includes a detection switch unit, a thermistor unit, a voltage divider unit, and a detection output terminal; the detection switch unit, the thermistor unit, and the voltage divider unit are connected in series between the first power supply terminal and the second power supply terminal; the detection output terminal is connected to the connection line between the thermistor unit and the voltage divider unit; and the control terminal of the detection switch unit receives a detection control signal.

[0012] Optionally, the temperature compensation sub-circuit includes a temperature data writing module, a temperature switch module, a heating module, and a temperature storage module;

[0013] The first terminal of the temperature data writing module is connected to the temperature control voltage, the second terminal of the temperature data writing module is electrically connected to the control terminal of the temperature switch module, and the control terminal of the temperature data writing module is connected to the compensation control signal.

[0014] The first terminal of the temperature switch module is electrically connected to the first power supply terminal, the second terminal of the temperature switch module is electrically connected to the first terminal of the heating module, and the second terminal of the heating module is electrically connected to the second power supply terminal; the temperature switch module is used to generate a heating current according to the temperature control voltage, and the heating module is used to generate heat according to the heating current;

[0015] The first end of the temperature storage module is electrically connected to the first end of the temperature switch module, and the second end of the storage module is electrically connected to the first power supply terminal or the second power supply terminal.

[0016] Preferably, the heating module includes a heating resistor;

[0017] Preferably, the heating module is positioned in contact with the light-emitting module.

[0018] Optionally, the driving sub-circuit is used to write a data voltage that controls the amplitude and / or pulse width of the driving current during the data writing phase; the temperature compensation sub-circuit is used to write the temperature control voltage before the data writing phase within one frame; the driving sub-circuit includes a pulse width modulation module and a pulse amplitude modulation module;

[0019] Preferably, the data writing stage includes a first data writing stage and a second data writing stage; the pulse width modulation module is electrically connected to the pulse amplitude modulation module and the first power supply terminal; the pulse amplitude modulation module is used to write a first data voltage in the first data writing stage, and the first data voltage is used to control the amplitude of the driving current; the pulse width modulation module is used to write a second data voltage in the second data voltage writing stage, and the second data voltage is used to control the pulse width of the driving current.

[0020] Optionally, the pulse width modulation module includes: a first initialization unit, a first driving unit, a coupling unit, a first threshold compensation unit, a second threshold compensation unit, and a turn-off signal writing unit;

[0021] The first end of the coupling unit is connected to the second data voltage or a frequency sweep signal, and the second end of the coupling unit is electrically connected to the control terminal of the first driving unit; the first end of the first initialization unit is connected to a first initialization signal, and the second end of the first initialization unit is electrically connected to the control terminal of the first driving unit, and the control terminal of the first initialization unit is connected to a second scan signal; the first end of the first threshold compensation unit is electrically connected to the first power supply terminal, and the second end of the first threshold compensation unit is electrically connected to the first end of the first driving unit, and the control terminal of the first threshold compensation unit is connected to the first scan signal; the first end of the second threshold compensation unit is electrically connected to the first end of the first driving unit, and the second end of the second threshold compensation unit is electrically connected to the control terminal of the first driving unit, and the control terminal of the second threshold compensation unit is connected to the first scan signal; the first end of the turn-off signal writing unit is electrically connected to the first power supply terminal, and the second end of the turn-off signal writing unit is electrically connected to the first end of the first driving unit, and the control terminal of the turn-off signal writing unit is connected to a first light emission control signal.

[0022] Optionally, the pulse amplitude modulation module includes a first light-emitting control unit, a second driving unit, a second light-emitting control unit, a pulse amplitude data writing unit, a third threshold compensation unit, a second initialization unit, a third initialization unit, a first storage unit, and a second storage unit;

[0023] The first terminal of the first light-emitting control unit is electrically connected to the first power supply terminal, the second terminal of the first light-emitting control unit is electrically connected to the first terminal of the second driving unit, and the control terminal of the first light-emitting control unit is electrically connected to the second terminal of the first driving unit; the first terminal of the second light-emitting control unit is electrically connected to the second terminal of the second driving unit, the second terminal of the second light-emitting control unit is electrically connected to the first terminal of the light-emitting module, and the control terminal of the second light-emitting control unit is connected to a second light-emitting control signal; the first terminal of the pulse amplitude data writing unit is connected to the first data voltage, the second terminal of the pulse amplitude data writing unit is electrically connected to the first terminal of the second driving unit, and the control terminal of the pulse amplitude data writing unit is connected to the second scanning signal; the first terminal of the third threshold compensation unit is electrically connected to the second terminal of the second driving unit, and the second terminal of the third threshold compensation unit is connected to the second driving unit. The control terminal of the first initialization unit is electrically connected to the second initialization signal, and the control terminal of the second initialization unit is electrically connected to the control terminal of the first light-emitting control unit. The control terminal of the second initialization unit is also connected to a global control signal. The first terminal of the third initialization unit is connected to a third initialization signal, and the second terminal of the third initialization unit is electrically connected to the control terminal of the second driving unit. The control terminal of the third initialization unit is also connected to a third scan signal. The first terminal of the first storage unit is electrically connected to the first power supply terminal, and the second terminal of the first storage unit is electrically connected to the control terminal of the second driving unit. The first terminal of the second storage unit is electrically connected to the first power supply terminal, and the second terminal of the second storage unit is electrically connected to the control terminal of the first light-emitting control unit. The second terminal of the light-emitting module is electrically connected to the second power supply terminal.

[0024] According to another aspect of the present invention, a display panel is provided, the display panel including a plurality of pixel circuits as described above.

[0025] According to another aspect of the present invention, a display method for a display panel is provided, the display panel including a plurality of pixel circuits as described above; the display method for the display panel includes:

[0026] Before the light emission phase within a frame, the temperature control voltage is transmitted to the temperature compensation sub-circuit of each pixel circuit to control the temperature of the light emission module.

[0027] Optionally, before transmitting the temperature control voltage to the temperature compensation sub-circuit of each pixel circuit during the light emission phase within a frame, the method further includes:

[0028] Detect the temperature of the light-emitting module;

[0029] The temperature control voltage is determined based on the temperature of the light-emitting module and the relationship between the temperature and brightness of the light-emitting module;

[0030] Preferably, determining the temperature control voltage based on the temperature of the light-emitting module and the correspondence between the temperature and brightness of the light-emitting module includes:

[0031] The first temperature threshold and the second temperature threshold are determined based on the correspondence between temperature and brightness.

[0032] If the temperature of the light-emitting module is less than a first temperature threshold, the temperature control voltage is a first preset value; if the temperature of the light-emitting module is greater than or equal to the first temperature threshold and less than a second temperature threshold, the temperature control voltage is a second preset value; if the temperature of the light-emitting module is greater than or equal to the second temperature threshold, the temperature control voltage is a third preset value; the first preset value is greater than the second preset value, and the second preset value is greater than the third preset value.

[0033] Preferably, the first preset value is negatively correlated with the rate at which the brightness of the light-emitting module decays with temperature;

[0034] Preferably, the second preset value is negatively correlated with the rate at which the brightness of the light-emitting module decays with temperature;

[0035] Preferably, the third preset value is zero.

[0036] Optionally, the display panel includes multiple rows of the pixel circuitry;

[0037] The transmission of the temperature control voltage to the temperature compensation sub-circuit of each pixel circuit includes:

[0038] The temperature control voltage is transmitted line by line to the temperature compensation sub-circuit of the pixel circuit;

[0039] The process further includes, after transmitting the temperature control voltage to the temperature compensation sub-circuit of the pixel circuit in one row:

[0040] A data voltage is transmitted to the driving sub-circuit of the pixel circuit described in a row, the data voltage being used to control the amplitude and / or pulse width of the driving current.

[0041] The technical solution of this invention employs a pixel circuit including a driving sub-circuit, a light-emitting module, and a temperature compensation sub-circuit. The driving sub-circuit and the light-emitting module are connected in series between a first power supply terminal and a second power supply terminal. The driving sub-circuit generates a driving current during the light-emitting phase, and the light-emitting module emits light in response to the driving current. The temperature compensation sub-circuit is electrically connected to both the first and second power supply terminals. A temperature control voltage is connected to the data input terminal of the temperature compensation sub-circuit. The temperature compensation sub-circuit controls the temperature of the light-emitting module according to the temperature control voltage before the light-emitting phase within a frame. The temperature compensation sub-circuit generates heat according to the temperature control voltage, thereby controlling the temperature rise of the light-emitting module. This allows the temperature of the light-emitting module to rise rapidly to a stable threshold, or to a level above the stable threshold, thus shortening the time required for the light-emitting module to decay from its initial brightness to a stable brightness. This improves the display effect and performance of the pixel circuit.

[0042] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 A schematic diagram of a pixel circuit structure provided in an embodiment of the present invention;

[0045] Figure 2 A schematic diagram illustrating the relationship between brightness decay and temperature and time in a light-emitting module, provided as an embodiment of the present invention;

[0046] Figure 3 A schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention;

[0047] Figure 4 A timing diagram of a pixel circuit provided in an embodiment of the present invention;

[0048] Figure 5 A schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention;

[0049] Figure 6 A schematic diagram of the circuit structure of a temperature detection sub-circuit provided in an embodiment of the present invention;

[0050] Figure 7A schematic diagram of the circuit structure of a temperature compensation sub-circuit provided in an embodiment of the present invention;

[0051] Figure 8 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention;

[0052] Figure 9 This is a flowchart illustrating a display panel display method provided in an embodiment of the present invention. Detailed Implementation

[0053] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0054] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0055] In the process of developing this invention, the inventors discovered the following problem with pixel circuits in related technologies: During display, the brightness of the light-emitting module in the pixel circuit decreases until it stabilizes along with the thermal efficiency curve of the light-emitting module. That is, the light-emitting module is initially bright, but as the illumination time increases, the brightness gradually decreases until it stabilizes, and the time required for the brightness to decrease from the initial brightness to the stable brightness is relatively long, resulting in poor performance of the pixel circuit. Furthermore, the inventors discovered that the brightness of the light-emitting module is related to its temperature. Initially, the light-emitting module is brighter due to its lower temperature; as the illumination time increases, the temperature of the light-emitting module gradually increases until it stabilizes, and the brightness of the light-emitting module also gradually decreases until it stabilizes.

[0056] To address the aforementioned technical problems, the present invention proposes the following solutions:

[0057] Figure 1This is a schematic diagram of a pixel circuit structure provided in an embodiment of the present invention, with reference to... Figure 1 The pixel circuit includes a driving sub-circuit 1, an emissive module 3, and a temperature compensation sub-circuit 2. The driving sub-circuit 1 and the emissive module 3 are connected in series between the first power supply terminal VDD and the second power supply terminal VSS. The driving sub-circuit 1 is used to generate a driving current during the emissive phase, and the emissive module 3 is used to emit light in response to the driving current. The temperature compensation sub-circuit 2 is electrically connected to the first power supply terminal VDD and the second power supply terminal VSS. The data input terminal of the temperature compensation sub-circuit 2 is connected to the temperature control voltage DataTe. The temperature compensation sub-circuit 2 is used to control the temperature of the emissive module 3 according to the temperature control voltage DataTe before the emissive phase within a frame.

[0058] Specifically, the pixel circuit can be applied in a display panel. The driving sub-circuit 1 in the pixel circuit can generate a driving current based on the data voltage, and the light-emitting module 3 can emit light of different brightness in response to different driving currents. That is, different grayscale levels of light can be emitted by the light-emitting module 3 by different data voltages. The light-emitting module 3 is a current-type device, such as an OLED (Organic Light Emitting Diode), Micro LED (Micro Light Emitting Diode), or Mini LED (Mini Light Emitting Diode). Among these, Micro LED has ultra-high resolution, high color gamut, wide viewing angle, ultra-high refresh rate, and nanosecond-level response speed; therefore, the light-emitting module 3 is preferably a Micro LED. However, as... Figure 2 As shown, Figure 2 This diagram illustrates the relationship between brightness decay and temperature versus time in a light-emitting module according to an embodiment of the present invention. During the light-emitting process, the thermal efficiency curve (i.e., the brightness decay-time curve) of a Micro LED exhibits decay, meaning that the brightness gradually decreases as the temperature increases. Furthermore, the temperature-time curve shows that the brightness no longer decays after the temperature exceeds a stable threshold. Moreover, the time required for the temperature of a Micro LED to rise to a stable threshold due to light emission is relatively long, resulting in poor performance of the pixel circuitry.

[0059] In this embodiment, a temperature compensation sub-circuit 2 is provided, connected between the first power supply terminal VDD and the second power supply terminal VSS. The first power supply terminal VDD and the second power supply terminal VSS provide a current loop for the temperature compensation sub-circuit 2. The temperature compensation sub-circuit 2 can control the temperature rise of the light-emitting module 3 according to the temperature control voltage DataTe, thereby enabling the temperature of the light-emitting module 3 to rise rapidly to a stable threshold, or rise above the stable threshold. This shortens the time required for the light-emitting module 3 to decrease from its initial brightness to a stable brightness, allowing the light-emitting module 3 to reach thermal equilibrium (i.e., its brightness is basically unaffected by temperature changes) earlier. This improves the display effect of the pixel circuit and enhances its performance.

[0060] In this embodiment, the thermal efficiency curves and stability thresholds of the light-emitting modules 3 in different pixel circuits may differ. Therefore, the heat generation of the temperature compensation sub-circuit 2 can be controlled by different temperature control voltages DataTe, thereby making the time required for the temperature of the light-emitting modules 3 in different pixel circuits in the display panel to reach the corresponding stability threshold from the initial light-emitting temperature approximately the same, which can improve the display effect of the display panel. In addition, for the same pixel circuit, different temperature control voltages DataTe can also be input at different light-emitting stages. Specific implementation methods will be described in detail later.

[0061] The technical solution of this embodiment employs a pixel circuit including a driving sub-circuit, a light-emitting module, and a temperature compensation sub-circuit. The driving sub-circuit and the light-emitting module are connected in series between a first power supply terminal and a second power supply terminal. The driving sub-circuit generates a driving current during the light-emitting phase, and the light-emitting module emits light in response to the driving current. The temperature compensation sub-circuit is electrically connected to both the first and second power supply terminals. A temperature control voltage is connected to the data input terminal of the temperature compensation sub-circuit. The temperature compensation sub-circuit controls the temperature of the light-emitting module according to the temperature control voltage before the light-emitting phase within a frame. The temperature compensation sub-circuit generates heat according to the temperature control voltage, thereby controlling the temperature rise of the light-emitting module. This allows the temperature of the light-emitting module to rise rapidly to a stable threshold, or to a level above the stable threshold, thus shortening the time required for the light-emitting module to decay from its initial brightness to a stable brightness. This improves the display effect and performance of the pixel circuit.

[0062] Optionally, the driving sub-circuit 1 in the pixel circuit can be a driving sub-circuit including two transistors and one capacitor, which is often referred to in the art as a "2T1C" pixel driving circuit. Alternatively, the driving sub-circuit 1 can also be a driving sub-circuit including seven transistors and one capacitor, which is often referred to in the art as a "7T1C" pixel driving circuit. Of course, the driving sub-circuit 1 can also be in other forms. This embodiment only describes one of them.

[0063] like Figure 3 As shown, Figure 3 This is a schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention, with reference to... Figure 3 The driving sub-circuit 1 includes a pulse width modulation module 11 and a pulse amplitude modulation module 12; the pulse width modulation module 11 is electrically connected to the pulse amplitude modulation module 12 and the first power supply terminal VDD; the pulse amplitude modulation module 11 is used to write a first data voltage DataI during the first data writing stage, and the first data voltage DataI is used to control the amplitude of the driving current; the pulse width modulation module 12 is used to write a second data voltage Datat during the second data voltage writing stage, and the second data voltage Datat is used to control the pulse width of the driving current.

[0064] Specifically, the pixel circuit in this embodiment is a hybrid digital and analog driving circuit. The analog driving part, namely the pulse amplitude modulation module 12, can control the amplitude of the driving current according to the first data voltage DataI, thereby controlling the brightness of the light-emitting module 3. The digital driving part, namely the pulse width modulation module 11, can control the pulse width of the driving current according to the second data voltage Datat, thereby controlling the light-emitting duration of the light-emitting module 3 within a frame to control the display brightness. This hybrid digital and analog driving method is more conducive to the grayscale expansion of the light-emitting module 3, thus achieving finer grayscale adjustment.

[0065] Optionally, continue to refer to Figure 3 The pulse width modulation module 11 includes: a first initialization unit 112, a first driving unit 111, a coupling unit 116, a first threshold compensation unit 113, a second threshold compensation unit 114, and a turn-off signal writing unit 115.

[0066] The first terminal of coupling unit 116 is connected to the second data voltage Datat or the sweep frequency signal Sweep, and the second terminal of coupling unit 116 is electrically connected to the control terminal of the first driving unit 111; the first terminal of the first initialization unit 112 is connected to the first initialization signal Vint1, and the second terminal of the first initialization unit 112 is electrically connected to the control terminal of the first driving unit 111, and the control terminal of the first initialization unit 112 is connected to the second scan signal Gn-1; the first terminal of the first threshold compensation unit 113 is electrically connected to the first power supply terminal VDD, and the second terminal of the first threshold compensation unit 113 is electrically connected to the first terminal of the first driving unit 111. The control terminal of the first threshold compensation unit 113 is connected to the first scan signal Gn; the first terminal of the second threshold compensation unit 114 is electrically connected to the first terminal of the first driving unit 111, and the second terminal of the second threshold compensation unit 114 is electrically connected to the control terminal of the first driving unit 111, and the control terminal of the second threshold compensation unit 114 is connected to the first scan signal Gn; the first terminal of the turn-off signal writing unit 115 is electrically connected to the first power supply terminal VDD, and the second terminal of the turn-off signal writing unit 115 is electrically connected to the first terminal of the first driving unit 111, and the control terminal of the turn-off signal writing unit 115 is connected to the first light emission control signal EM2.

[0067] The pulse amplitude modulation module 12 includes a first light-emitting control unit 122, a second driving unit 121, a second light-emitting control unit 123, a pulse amplitude data writing unit 124, a third threshold compensation unit 125, a second initialization unit 129, a third initialization unit 126, a first storage unit 127, and a second storage unit 128. The first terminal of the first light-emitting control unit 122 is electrically connected to the first power supply terminal VDD, the second terminal of the first light-emitting control unit 122 is electrically connected to the first terminal of the second driving unit 121, and the control terminal of the first light-emitting control unit 122 is electrically connected to the second terminal of the first driving unit 121. The first terminal of the second light-emitting control unit 123 is electrically connected to the second terminal of the second driving unit 121, and the second terminal of the second light-emitting control unit 123 is electrically connected to the first terminal of the light-emitting module 3. The control terminal of the second light-emitting control unit 123 is connected to the second light-emitting control signal EM1. The first terminal of the pulse amplitude data writing unit 124 is connected to the first data voltage DataI, the second terminal of the pulse amplitude data writing unit 124 is electrically connected to the first terminal of the second driving unit 121, and the control terminal of the pulse amplitude data writing unit 124 is connected to the second scan signal Gn-1. The third threshold compensation unit 125... The first terminal of element 125 is electrically connected to the second terminal of the second driving unit 121; the second terminal of the third threshold compensation unit 125 is electrically connected to the control terminal of the second driving unit 121; and the control terminal of the third threshold compensation unit 125 is connected to the second scanning signal Gn-1. The first terminal of the second initialization unit 129 is connected to the second initialization signal Vint2; the second terminal of the second initialization unit 129 is electrically connected to the control terminal of the first light-emitting control unit 122; and the control terminal of the second initialization unit 129 is connected to the global control signal Set. The first terminal of the third initialization unit 126 is connected to the third initialization signal Vi. nt3, the second end of the third initialization unit 126 is electrically connected to the control end of the second driving unit 121, and the control end of the third initialization unit 126 is connected to the third scan signal Gn-2; the first end of the first storage unit 127 is electrically connected to the first power supply terminal VDD, and the second end of the first storage unit 127 is electrically connected to the control end of the second driving unit 121; the first end of the second storage unit 128 is electrically connected to the first power supply terminal VDD, and the second end of the second storage unit 128 is electrically connected to the control end of the first light-emitting control unit 122; the second end of the light-emitting module 3 is electrically connected to the second power supply terminal VSS.

[0068] Specifically, Figure 4 A timing diagram of a pixel circuit provided in an embodiment of the present invention is shown below. Figure 3 and Figure 4 The operation of a pixel circuit within a single TF frame includes stages t2-t8.

[0069] In the first stage t1, which is the stage where the previous frame is displayed, the control terminal of the first light-emitting control unit 122 is written with the voltage of the first power supply terminal VDD, the first light-emitting control unit 122 is turned off, and the light-emitting module 3 does not emit light.

[0070] In the second stage t2, the third scan signal Gn-2 controls the third initialization unit 126 to be turned on, and then the control terminal of the second drive unit 121 is initialized by the third initialization signal Vint3, so that the second drive unit 121 is turned on.

[0071] In the third stage t3, the second scan signal Gn-1 is enabled, controlling the first initialization unit 112 to conduct. This, in turn, initializes the control terminal of the first drive unit 111 using the first initialization signal Vint1, turning on the first drive unit 111. Additionally, the third stage t3 is also the first data voltage writing stage. The pulse amplitude data writing unit 124 and the third threshold compensation unit 125 are turned on. The first data voltage DataI is written to the control terminal of the second drive unit 121 after passing through the pulse amplitude data writing unit 124, the second drive unit 121, and the third threshold compensation unit 125, completing the threshold compensation for the second drive unit 121. The first storage unit 127 maintains the potential of the second drive unit 121.

[0072] In the fourth stage t4, which is the second data voltage writing stage, the second data voltage Datat is written to the coupling unit 116. Simultaneously, the first threshold compensation unit 113 and the second threshold compensation unit 114 are turned on, and the voltage of the first power supply terminal VDD is written to the control terminal of the first driving unit 111, completing the threshold compensation for the first driving unit 111. At this time, the voltages across the coupling unit 116 are Datat and VDDW+Vth, respectively, where Vth is the threshold voltage of the first driving unit 111, and VDDW is the voltage of the first power supply terminal VDD. Therefore, the voltage difference across the coupling unit 116 is VDDW+Vth-Datat.

[0073] In the fifth stage t5, the pixel circuits of other pixel rows sequentially undergo the aforementioned stages. After stage t5, the second data voltage writing for all pixel circuits within one frame of the display panel is completed.

[0074] In the sixth stage t6, all row pixel circuits have completed the fourth and fifth stages. At this time, the first terminal of the coupling unit 116 receives a sweep signal sweepp. The sweep signal sweepp is greater than or equal to the maximum value of all second data voltages Datat. At this time, the control terminal voltage of the first driving unit 111 is sweepp + VDDW + Vth - datat.

[0075] In the seventh stage t7, the global control signal set controls the second initialization unit 129 to be turned on, and the second initialization signal Vint2 initializes the control terminal of the first light-emitting control unit 122, so that the first light-emitting control unit 122 is turned on.

[0076] In the eighth stage t8, i.e., the light-emitting stage, the second light-emitting control signal EM1 controls the second light-emitting control unit 123 to turn on, and the light-emitting module 3 starts to emit light. The first light-emitting control signal EM2 controls the turn-off signal writing unit 115 to turn on. The sweep signal is written to the coupling unit 116, and the coupling unit 116 couples the sweep signal to the control terminal of the first driving unit. The potential of the control terminal of the first driving unit 111 starts to decrease under the control of the sweep voltage. When the voltage difference between the control terminal and the first terminal is the threshold voltage of the first driving unit 111, the first driving unit 111 turns on, so that the control terminal of the first light-emitting control unit 122 writes the voltage of the first power supply terminal VDD, the first light-emitting control unit 122 turns off, and the light emission ends.

[0077] Optionally, continue to refer to Figure 3 The first driving unit 111 includes a first transistor T1, the first end of the first transistor T1 serves as the first end of the first driving unit 111, the second end of the first transistor T1 serves as the second end of the first driving unit 111, and the control end of the first transistor T1 serves as the control end of the first driving unit 111.

[0078] The second driving unit 121 includes a second transistor T2, the first terminal of the second transistor T2 serves as the first terminal of the second driving unit 121, the second terminal of the second transistor T2 serves as the second terminal of the second driving unit 121, and the control terminal of the second transistor T2 serves as the control terminal of the second driving unit 121.

[0079] The first light-emitting control unit 122 includes a third transistor T3. The first terminal of the third transistor T3 serves as the first terminal of the first light-emitting control unit 122, the second terminal of the third transistor T3 serves as the second terminal of the first light-emitting control unit 122, and the control terminal of the third transistor T3 serves as the control terminal of the first light-emitting control unit 122.

[0080] The second light-emitting control unit 123 includes a fourth transistor T4. The first terminal of the fourth transistor T4 serves as the first terminal of the second light-emitting control unit 123, the second terminal of the fourth transistor T4 serves as the second terminal of the second light-emitting control unit 123, and the control terminal of the fourth transistor T4 serves as the control terminal of the second light-emitting control unit 123.

[0081] The pulse amplitude data writing unit 124 includes a fifth transistor T5. The first terminal of the fifth transistor T5 serves as the first terminal of the pulse amplitude data writing unit 124, the second terminal of the fifth transistor T5 serves as the second terminal of the pulse amplitude data writing unit 124, and the control terminal of the fifth transistor T5 serves as the control terminal of the pulse amplitude data writing unit 124.

[0082] The third initialization unit 126 includes a sixth transistor T6. The first terminal of the sixth transistor T6 serves as the first terminal of the third initialization unit 126, the second terminal of the sixth transistor T6 serves as the second terminal of the third initialization unit 126, and the control terminal of the sixth transistor T6 serves as the control terminal of the third initialization unit 126.

[0083] The third threshold compensation unit 125 includes a seventh transistor T7. The first terminal of the seventh transistor T7 serves as the first terminal of the third threshold compensation unit 125, the second terminal of the seventh transistor T7 serves as the second terminal of the third threshold compensation unit 125, and the control terminal of the seventh transistor T7 serves as the control terminal of the third threshold compensation unit 125.

[0084] The second threshold compensation unit 114 includes an eighth transistor T8. The first terminal of the eighth transistor T8 serves as the first terminal of the second threshold compensation unit 114, the second terminal of the eighth transistor T8 serves as the second terminal of the second threshold compensation unit 114, and the control terminal of the eighth transistor T8 serves as the control terminal of the second threshold compensation unit 114.

[0085] The first initialization unit 112 includes a ninth transistor T9. The first terminal of the ninth transistor T9 serves as the first terminal of the first initialization unit 112, the second terminal of the ninth transistor T9 serves as the second terminal of the first initialization unit 112, and the control terminal of the ninth transistor T9 serves as the control terminal of the first initialization unit 112.

[0086] The second initialization unit 129 includes a tenth transistor T10. The first terminal of the tenth transistor T10 serves as the first terminal of the second initialization unit 129, the second terminal of the tenth transistor T10 serves as the second terminal of the second initialization unit 129, and the control terminal of the tenth transistor T10 serves as the control terminal of the second initialization unit 129.

[0087] The first threshold compensation unit 113 includes an eleventh transistor T11. The first terminal of the eleventh transistor T11 serves as the first terminal of the first threshold compensation unit 113, the second terminal of the eleventh transistor T11 serves as the second terminal of the first threshold compensation unit 113, and the control terminal of the eleventh transistor T11 serves as the control terminal of the first threshold compensation unit 113.

[0088] The shutdown signal writing unit 115 includes a twelfth transistor T12. The first terminal of the twelfth transistor T12 serves as the first terminal of the shutdown signal writing unit 115, the second terminal of the twelfth transistor T12 serves as the second terminal of the shutdown signal writing unit 115, and the control terminal of the twelfth transistor T12 serves as the control terminal of the shutdown signal writing unit 115.

[0089] The first storage cell 127 includes a first capacitor C1, with its first terminal serving as the first terminal of the first storage cell 127 and its second terminal serving as the second terminal of the first storage cell 127. The second storage cell 128 includes a second capacitor C2, with its first terminal serving as the first terminal of the second storage cell 128 and its second terminal serving as the second terminal of the second storage cell 128. The coupling unit 116 includes a third capacitor C3, with its first terminal serving as the first terminal of the coupling unit 116 and its second terminal serving as the second terminal of the coupling unit 116.

[0090] The transistors mentioned above can be N-type transistors or P-type transistors, but P-type transistors are preferred.

[0091] Optionally, Figure 5 This is a schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention, with reference to... Figure 5 The pixel circuit also includes a temperature detection sub-circuit 4, which is used to detect the temperature of the light-emitting module 3. The temperature control voltage DataTe corresponds to the temperature of the light-emitting module 3. Specifically, if the temperature of the light-emitting module 3 is less than a first temperature threshold, the temperature control voltage is a first preset value; if the temperature of the light-emitting module 3 is greater than or equal to the first temperature threshold and less than a second temperature threshold, the temperature control voltage is a second preset value; if the temperature of the light-emitting module is greater than or equal to the second temperature threshold, the temperature control voltage is a third preset value; the first preset value is greater than the second preset value, and the second preset value is greater than the third preset value.

[0092] Specifically, the heat generated by the light-emitting module 3 varies at different light-emitting stages. In the initial stage of light emission, the initial temperature of the light-emitting module 3 is low, the heat generated is less, and its brightness is brighter, but the brightness decays rapidly. In the transition stage, the heat generated by the light-emitting module 3 is moderate, and its brightness decay rate is also moderate. In the stable stage, the heat generated by the light-emitting module 3 is relatively large, and the heat generated by the light-emitting module 3 itself is sufficient to bring the light-emitting module 3 to a thermal equilibrium state. In this embodiment, by setting a temperature detection sub-circuit 4, the current light-emitting stage of the light-emitting module 3 can be detected. When the temperature of the light-emitting module 3 is detected to be less than the first temperature threshold, it indicates that the light emission of the light-emitting module 3 is in the initial stage. At this time, the temperature control voltage is the first preset value, and the heat generated by the temperature compensation sub-circuit 2 is relatively large, causing the temperature of the light-emitting module 3 to rise rapidly. When the temperature of the light-emitting module 3 is detected to be greater than or equal to the first temperature threshold and less than the second temperature threshold, it indicates that the light emission of the light-emitting module 3 is in the transition stage. The heat generated by the light-emitting module 3 itself is relatively large. At this time, the temperature control voltage is the second preset value, and the heat generated by the temperature compensation sub-circuit 2 is relatively small (its temperature is still greater than the temperature of the light-emitting module), causing the temperature of the light-emitting module 3 to continue to rise. When the temperature of the light-emitting module 3 is detected to be greater than or equal to the second temperature threshold, it indicates that the light emission of the light-emitting module 3 is in a stable stage, and the heat generated by the light-emitting module 3 itself can reach a thermal equilibrium state. At this time, the temperature control voltage is the third preset value. The third preset value is relatively small, which can reduce the power consumption of the pixel circuit. That is to say, by setting the first preset value to be greater than the second preset value, and the second preset value to be greater than the third preset value, this embodiment can not only make the light-emitting module 3 quickly reach a stable state, but also reduce the power consumption of the pixel circuit.

[0093] Optionally, the first temperature threshold and the second temperature threshold are determined by the correspondence between the temperature and brightness of the light-emitting module.

[0094] Specifically, such as Figure 2 As shown, the relationship between the temperature and brightness of the light-emitting module can be obtained by combining the temperature-time curve and the brightness decay-time curve. Before the temperature of the light-emitting module reaches the thermal equilibrium temperature, the relationship between the brightness and temperature of the light-emitting module approaches a linear relationship. The second temperature threshold is the temperature threshold at which the light-emitting module reaches the thermal equilibrium state; the second temperature threshold may differ for different light-emitting modules. The first temperature threshold can be the temperature at which the rate of change of temperature over time (i.e., the slope of the temperature-time curve) is less than a preset rate of change.

[0095] Optionally, the relationship between the brightness and temperature of the light-emitting module 3 can be obtained by testing a display panel sample. Specifically, the brightness can be pixel-level brightness data captured by a camera, and the temperature of the light-emitting module 3 can be obtained by a thermocouple.

[0096] Optionally, Figure 6This is a schematic diagram of the circuit structure of a temperature detection sub-circuit provided in an embodiment of the present invention, with reference to... Figure 6 The temperature detection sub-circuit 4 includes a detection switch unit 41, a thermistor unit 42, a voltage divider unit 43, and a detection output terminal TeOUT. The detection switch unit 41, the thermistor unit 42, and the voltage divider unit 43 are connected in series between the first power supply terminal VDD and the second power supply terminal VSS. The detection output terminal TeOUT is connected to the connection line between the thermistor unit 42 and the voltage divider unit 43. The control terminal of the detection switch unit 41 is connected to the detection control signal CS2.

[0097] Specifically, when the temperature of the light-emitting module 3 is different, the resistance of the thermistor unit 42 is different. When the detection switch unit 41 is turned on, the thermistor unit 42 and the voltage divider unit 43 divide the voltage, causing a change in the voltage on the connection line between the thermistor unit 42 and the voltage divider unit 43, which is also a change in the voltage at the detection output terminal TeOUT. By analyzing the voltage at the detection output terminal TeOUT, the temperature of the light-emitting module 3 can be obtained. The detection output terminal TeOUT can be electrically connected to the driver chip to transmit the temperature data of the light-emitting module 3 to the driver chip.

[0098] Optionally, the detection control signal CS2 can be one of the first scan signal Gn, the second scan signal Gn-1, and the third scan signal Gn-2. The temperature detection sub-circuit only starts detection during the period when the detection switch unit 41 is turned on, and does not detect at other stages within a frame, thus the pixel circuit has low power consumption.

[0099] Optionally, continue to refer to Figure 6 The detection switch unit 41 includes a thirteenth transistor T13, the thermistor unit 42 includes a thermistor R1, and the voltage divider unit 42 includes a voltage divider resistor R2. The first terminal of the thirteenth transistor T13 is electrically connected to the first power supply terminal VDD, and the second terminal of the thirteenth transistor T13 is electrically connected to the first terminal of the thermistor R1. The control terminal of the thirteenth transistor T13 serves as the control terminal of the detection switch unit 41. The first terminal of the thermistor R1 serves as the second terminal of the thermistor unit and is electrically connected to the first terminal of the voltage divider resistor R2. The second terminal of the voltage divider resistor R2 is electrically connected to the second power supply terminal VSS.

[0100] It should be noted that the temperature detection sub-circuit can also take other forms.

[0101] Optionally, Figure 7 This is a schematic diagram of the circuit structure of a temperature compensation sub-circuit provided in an embodiment of the present invention, with reference to... Figure 7The temperature compensation sub-circuit includes a temperature data writing module 21, a temperature switch module 22, a heating module 23, and a temperature storage module 24. The first terminal of the temperature data writing module 21 is connected to the temperature control voltage DataTe, and the second terminal of the temperature data writing module 21 is electrically connected to the control terminal of the temperature switch module 22. The control terminal of the temperature data writing module 21 is connected to the compensation control signal CS1. The first terminal of the temperature switch module 22 is electrically connected to the first power supply terminal VDD, and the second terminal of the temperature switch module 22 is electrically connected to the first terminal of the heating module 23. The second terminal of the heating module 23 is electrically connected to the second power supply terminal VSS. The temperature switch module 22 generates current based on the temperature control voltage DataTe, and the heating module 23 generates heat based on the heating current. The first terminal of the temperature storage module 24 is electrically connected to the first terminal of the temperature switch module 22, and the second terminal of the temperature storage module 24 is electrically connected to either the first power supply terminal VDD or the second power supply terminal VSS.

[0102] Specifically, the temperature data writing module 21 is turned on before the light-emitting phase within a frame, causing the heating module 23 to heat up earlier, thus allowing the light-emitting module 3 to enter the thermal equilibrium phase earlier. When the temperature control voltage DataTe is different, the heating current generated by the temperature switch module 22 is also different, resulting in different heat generation of the heating module 23 and different rates of temperature rise of the light-emitting module 3. The temperature storage module 24 can maintain the potential of the control terminal of the temperature switch module 22, allowing the temperature switch module 22 to continuously output heating current. Therefore, by setting the temperature storage module 24, the temperature compensation sub-circuit can not only increase the temperature of the light-emitting module before the light-emitting phase within a frame, but also increase the temperature of the light-emitting module during the light-emitting phase.

[0103] Optionally, continue to refer to Figure 7The temperature data writing module 21 includes a fourteenth transistor T14, with its first and second terminals serving as the first and second terminals, and its control terminal serving as the control terminal. The temperature switching module 22 includes a fifteenth transistor T15, with its first and second terminals serving as the first and second terminals, and its control terminal serving as the control terminal. The heating module 23 includes a heating resistor R3, with its first and second terminals serving as the first and second terminals. The temperature storage module 24 includes a fourth capacitor C4, with its first and second terminals serving as the first and second terminals. Optionally, the heating module 23 is in contact with the light-emitting module, allowing the light-emitting module's temperature to rise more quickly.

[0104] Optionally, refer to Figure 3 and Figure 4 The driving sub-circuit is used to write a data voltage that controls the amplitude and / or pulse width of the driving current during the data writing phase; the temperature compensation sub-circuit is used to write a temperature control voltage before the data writing phase within a frame.

[0105] Specifically, in some implementations, such as the "7T1C" pixel driving circuit, only one data writing phase is included per frame. In a pixel driving circuit with hybrid digital and analog driving, the data writing phase includes a first data writing phase driven by analog and a second data writing phase driven by digital. In this embodiment, the temperature compensation sub-circuit writes a temperature control voltage before the data writing phase. When the first data writing phase precedes the second data writing phase, the temperature control voltage is written before the first data writing phase; when the second data writing phase precedes the first data writing phase, the temperature control voltage is written before the second data writing phase. Writing the temperature control voltage DataTe before the data voltage writing phase avoids interference with the data voltage when writing the temperature data voltage.

[0106] Optionally, the writing phase of the temperature control voltage coincides with the second phase. The compensation control signal CS1 can be obtained by multiplexing the third scan signal Gn-2.

[0107] The present invention also provides a display panel, such as Figure 8 As shown, Figure 8This is a schematic diagram of a display panel provided in an embodiment of the present invention. The display panel includes a plurality of pixel circuits PX as described in any embodiment of the present invention. Since the display panel provided in this embodiment of the present invention includes the pixel circuits provided in any embodiment of the present invention, it also has the same beneficial effects, which will not be described again here.

[0108] The present invention also provides a display method for a display panel, such as... Figure 9 As shown, Figure 9 A flowchart illustrating a display method for a display panel according to an embodiment of the present invention. The display method for the display panel includes:

[0109] In step S110, before the light emission stage within a frame, a temperature control voltage is transmitted to the temperature compensation sub-circuit of the individual pixel circuit to control the temperature of the light emission module.

[0110] Specifically, before the light-emitting module emits light, the temperature compensation sub-circuit writes a temperature control voltage and begins to heat up. The temperature compensation sub-circuit heats up according to the temperature control voltage, thereby controlling the temperature rise of the light-emitting module. This allows the temperature of the light-emitting module to rise quickly to a stable threshold, or above the stable threshold, thus shortening the time required for the light-emitting module to decay from its initial brightness to a stable brightness. This improves the display effect of the display panel and enhances its performance.

[0111] The technical solution of this embodiment employs a display method that allows the temperature of the light-emitting module to rise rapidly to a stable threshold, thereby shortening the time required for the light-emitting module to decay from its initial brightness to a stable brightness. This improves the display effect of the display panel and enhances its performance.

[0112] Optionally, before transmitting the temperature control voltage to the temperature compensation sub-circuit of each pixel circuit during the light emission phase within a frame, the method further includes:

[0113] Detect the temperature of the light-emitting module;

[0114] The temperature control voltage is determined based on the temperature of the light-emitting module and the relationship between the temperature and brightness of the light-emitting module.

[0115] Specifically, the temperature detection of the light-emitting module can be performed, for example, by a temperature detection sub-circuit. The correspondence between temperature and brightness can be obtained by testing a display panel sample. Specifically, the brightness can be pixel-level brightness data captured by a camera, and the temperature of the light-emitting module 3 can be obtained by a thermocouple. Determining the temperature control voltage based on the temperature of the light-emitting module and the correspondence between temperature and brightness includes: determining a first temperature threshold and a second temperature threshold based on the temperature-brightness correspondence; if the temperature of the light-emitting module is less than the first temperature threshold, the temperature control voltage is a first preset value; if the temperature of the light-emitting module is greater than or equal to the first temperature threshold and less than the second temperature threshold, the temperature control voltage is a second preset value; if the temperature of the light-emitting module is greater than or equal to the second temperature threshold, the temperature control voltage is a third preset value; the first preset value is greater than the second preset value, and the second preset value is greater than the third preset value.

[0116] refer to Figure 3 The heat generated by the light-emitting module 3 varies at different light-emitting stages. In the initial stage of light emission, the initial temperature of the light-emitting module 3 is low, the heat generated is less, and its brightness is bright, but the brightness decays rapidly. In the transition stage, the heat generated by the light-emitting module 3 is moderate, and its brightness decay rate is also moderate. In the stable stage, the heat generated by the light-emitting module 3 is relatively large, and the heat generated by the light-emitting module 3 itself is sufficient to bring the light-emitting module 3 to a thermal equilibrium state. In this embodiment, by setting a temperature detection sub-circuit 4, the current light-emitting stage of the light-emitting module 3 can be detected. When the temperature of the light-emitting module 3 is detected to be less than the first temperature threshold, it indicates that the light emission of the light-emitting module 3 is in the initial stage. At this time, the temperature control voltage is the first preset value, and the heat generated by the temperature compensation sub-circuit 2 is relatively large, causing the temperature of the light-emitting module 3 to rise rapidly. When the temperature of the light-emitting module 3 is detected to be greater than or equal to the first temperature threshold and less than the second temperature threshold, it indicates that the light emission of the light-emitting module 3 is in the transition stage. The heat generated by the light-emitting module 3 itself is relatively large. At this time, the temperature control voltage is the second preset value, and the heat generated by the temperature compensation sub-circuit 2 is relatively small (its temperature is still greater than the temperature of the light-emitting module), causing the temperature of the light-emitting module 3 to continue to rise. When the temperature of the light-emitting module 3 is detected to be greater than or equal to the second temperature threshold, it indicates that the light emission of the light-emitting module 3 is in a stable stage, and the heat generated by the light-emitting module 3 itself can reach a thermal equilibrium state. At this time, the temperature control voltage is the third preset value. The third preset value is relatively small, which can reduce the power consumption of the pixel circuit. That is to say, by setting the first preset value to be greater than the second preset value, and the second preset value to be greater than the third preset value, this embodiment can not only make the light-emitting module 3 quickly reach a stable state, but also reduce the power consumption of the pixel circuit.

[0117] Optionally, the first preset value is negatively correlated with the rate at which the brightness of the light-emitting module decays with temperature.

[0118] Specifically, the display panel includes various types of pixel circuits, each with a different color of light emitted by its light-emitting modules. For example, the display panel includes red pixel circuits (emitting red), green pixel circuits (emitting green), and blue pixel circuits (emitting blue). The light-emitting modules in the red pixel circuits are red, those in the green pixel circuits are green, and those in the blue pixel circuits are blue. The brightness of different colored light-emitting modules decays at different rates with temperature. Since the brightness of the red light-emitting module decays the fastest with temperature, a first preset value corresponding to the red light-emitting module can be controlled to be lower than the first preset values ​​corresponding to both the blue and green light-emitting modules. This allows the different types of light-emitting modules in the display panel to reach thermal equilibrium in approximately the same time, thereby further improving the display effect.

[0119] Optionally, the second preset value is negatively correlated with the rate at which the brightness of the light-emitting module decays with temperature. That is, the second preset value corresponding to the red light-emitting module is less than the second preset value corresponding to the blue light-emitting module and the second preset value corresponding to the green light-emitting module. This allows different types of light-emitting modules in the display panel to reach thermal equilibrium in roughly the same amount of time, thereby further improving the display effect.

[0120] Optionally, the third preset value is zero. After the light-emitting module 3 enters the thermal equilibrium state, the temperature control voltage is configured to zero. The light-emitting module 3 can reach thermal equilibrium solely by relying on its own heat generation, which can both stabilize the light emission of the light-emitting module 3 and reduce power consumption.

[0121] Optionally, the display panel includes multiple rows of pixel circuits; transmitting temperature control voltage to the temperature compensation sub-circuit of each pixel circuit includes:

[0122] Temperature control voltage is transmitted row by row to the temperature compensation sub-circuit of the pixel circuit;

[0123] The process of transmitting temperature control voltage to the temperature compensation sub-circuit of a row pixel circuit also includes:

[0124] Data voltage is transmitted to the driving sub-circuit of a row of pixel circuits. The data voltage is used to control the amplitude of the driving current and / or the pulse width.

[0125] Specifically, in this embodiment, the temperature control voltages of pixel circuits in the same row are written simultaneously. The temperature control voltages of pixel circuits in different rows are not written simultaneously. The temperature compensation sub-circuit writes the temperature control voltage before the data writing stage. For example... Figure 3 and Figure 4As shown, when the first data writing stage precedes the second data writing stage, the temperature control voltage is written before the first data writing stage; conversely, when the second data writing stage precedes the first data writing stage, the temperature control voltage is written before the second data writing stage. Writing the temperature control voltage (DataTe) before the data voltage writing stage avoids interference with the data voltage during the temperature data voltage writing process.

[0126] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0127] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A pixel circuit, characterized in that, The pixel circuit includes a driving sub-circuit, a light-emitting module, and a temperature compensation sub-circuit; The driving sub-circuit and the light-emitting module are connected in series between the first power supply terminal and the second power supply terminal; the driving sub-circuit is used to generate a driving current during the light-emitting stage, and the light-emitting module is used to emit light in response to the driving current; The temperature compensation sub-circuit is electrically connected to the first power supply terminal and the second power supply terminal. The data input terminal of the temperature compensation sub-circuit is connected to a temperature control voltage. The temperature compensation sub-circuit is used to control the temperature of the light-emitting module according to the temperature control voltage before the light-emitting stage within one frame.

2. The pixel circuit according to claim 1, characterized in that, The pixel circuit also includes a temperature detection sub-circuit, which is used to detect the temperature of the light-emitting module; The temperature control voltage corresponds to the temperature of the light-emitting module; wherein, if the temperature of the light-emitting module is less than a first temperature threshold, the temperature control voltage is a first preset value; if the temperature of the light-emitting module is greater than or equal to the first temperature threshold and less than a second temperature threshold, the temperature control voltage is a second preset value; if the temperature of the light-emitting module is greater than or equal to the second temperature threshold, the temperature control voltage is a third preset value; the first preset value is greater than the second preset value, and the second preset value is greater than the third preset value; Preferably, the first temperature threshold and the second temperature threshold are determined by the correspondence between the temperature and brightness of the light-emitting module; Preferably, the temperature detection sub-circuit includes a detection switch unit, a thermistor unit, a voltage divider unit, and a detection output terminal; the detection switch unit, the thermistor unit, and the voltage divider unit are connected in series between the first power supply terminal and the second power supply terminal; the detection output terminal is connected to the connection line between the thermistor unit and the voltage divider unit; and the control terminal of the detection switch unit receives a detection control signal.

3. The pixel circuit according to claim 1, characterized in that, The temperature compensation sub-circuit includes a temperature data writing module, a temperature switch module, a heating module, and a temperature storage module; The first terminal of the temperature data writing module is connected to the temperature control voltage, the second terminal of the temperature data writing module is electrically connected to the control terminal of the temperature switch module, and the control terminal of the temperature data writing module is connected to the compensation control signal. The first terminal of the temperature switch module is electrically connected to the first power supply terminal, the second terminal of the temperature switch module is electrically connected to the first terminal of the heating module, and the second terminal of the heating module is electrically connected to the second power supply terminal; the temperature switch module is used to generate a heating current according to the temperature control voltage, and the heating module is used to generate heat according to the heating current; The first end of the temperature storage module is electrically connected to the first end of the temperature switch module, and the second end of the storage module is electrically connected to the first power supply terminal or the second power supply terminal. Preferably, the heating module includes a heating resistor; Preferably, the heating module is positioned in contact with the light-emitting module.

4. The pixel circuit according to claim 1, characterized in that, The driving sub-circuit is used to write a data voltage that controls the amplitude and / or pulse width of the driving current during the data writing phase; the temperature compensation sub-circuit is used to write the temperature control voltage before the data writing phase within one frame; the driving sub-circuit includes a pulse width modulation module and a pulse amplitude modulation module; Preferably, the data writing stage includes a first data writing stage and a second data writing stage; the pulse width modulation module is electrically connected to the pulse amplitude modulation module and the first power supply terminal; the pulse amplitude modulation module is used to write a first data voltage in the first data writing stage, and the first data voltage is used to control the amplitude of the driving current; the pulse width modulation module is used to write a second data voltage in the second data voltage writing stage, and the second data voltage is used to control the pulse width of the driving current.

5. The pixel circuit according to claim 4, characterized in that, The pulse width modulation module includes: a first initialization unit, a first driving unit, a coupling unit, a first threshold compensation unit, a second threshold compensation unit, and a turn-off signal writing unit; The first end of the coupling unit is connected to the second data voltage or a frequency sweep signal, and the second end of the coupling unit is electrically connected to the control terminal of the first driving unit; the first end of the first initialization unit is connected to a first initialization signal, and the second end of the first initialization unit is electrically connected to the control terminal of the first driving unit, and the control terminal of the first initialization unit is connected to a second scan signal; the first end of the first threshold compensation unit is electrically connected to the first power supply terminal, and the second end of the first threshold compensation unit is electrically connected to the first end of the first driving unit, and the control terminal of the first threshold compensation unit is connected to the first scan signal; the first end of the second threshold compensation unit is electrically connected to the first end of the first driving unit, and the second end of the second threshold compensation unit is electrically connected to the control terminal of the first driving unit, and the control terminal of the second threshold compensation unit is connected to the first scan signal; the first end of the turn-off signal writing unit is electrically connected to the first power supply terminal, and the second end of the turn-off signal writing unit is electrically connected to the first end of the first driving unit, and the control terminal of the turn-off signal writing unit is connected to a first light emission control signal.

6. The pixel circuit according to claim 5, characterized in that, The pulse amplitude modulation module includes a first light-emitting control unit, a second driving unit, a second light-emitting control unit, a pulse amplitude data writing unit, a third threshold compensation unit, a second initialization unit, a third initialization unit, a first storage unit, and a second storage unit; The first terminal of the first light-emitting control unit is electrically connected to the first power supply terminal, the second terminal of the first light-emitting control unit is electrically connected to the first terminal of the second driving unit, and the control terminal of the first light-emitting control unit is electrically connected to the second terminal of the first driving unit; the first terminal of the second light-emitting control unit is electrically connected to the second terminal of the second driving unit, the second terminal of the second light-emitting control unit is electrically connected to the first terminal of the light-emitting module, and the control terminal of the second light-emitting control unit is connected to a second light-emitting control signal; the first terminal of the pulse amplitude data writing unit is connected to the first data voltage, the second terminal of the pulse amplitude data writing unit is electrically connected to the first terminal of the second driving unit, and the control terminal of the pulse amplitude data writing unit is connected to the second scanning signal; the first terminal of the third threshold compensation unit is electrically connected to the second terminal of the second driving unit, and the second terminal of the third threshold compensation unit is connected to the second driving unit. The control terminal of the first initialization unit is electrically connected to the second initialization signal, and the control terminal of the second initialization unit is electrically connected to the control terminal of the first light-emitting control unit. The control terminal of the second initialization unit is also connected to a global control signal. The first terminal of the third initialization unit is connected to a third initialization signal, and the second terminal of the third initialization unit is electrically connected to the control terminal of the second driving unit. The control terminal of the third initialization unit is also connected to a third scan signal. The first terminal of the first storage unit is electrically connected to the first power supply terminal, and the second terminal of the first storage unit is electrically connected to the control terminal of the second driving unit. The first terminal of the second storage unit is electrically connected to the first power supply terminal, and the second terminal of the second storage unit is electrically connected to the control terminal of the first light-emitting control unit. The second terminal of the light-emitting module is electrically connected to the second power supply terminal.

7. A display panel, characterized in that, The display panel includes a plurality of pixel circuits as described in any one of claims 1-6.

8. A display method for a display panel, characterized in that, The display panel includes a plurality of pixel circuits as described in any one of claims 1-6; The display method of the display panel includes: Before the light emission phase within a frame, the temperature control voltage is transmitted to the temperature compensation sub-circuit of each pixel circuit to control the temperature of the light emission module.

9. The display method of the display panel according to claim 8, characterized in that, Before the light emission phase within a frame, and before transmitting the temperature control voltage to the temperature compensation sub-circuit of each pixel circuit, the process further includes: Detect the temperature of the light-emitting module; The temperature control voltage is determined based on the temperature of the light-emitting module and the relationship between the temperature and brightness of the light-emitting module; Preferably, determining the temperature control voltage based on the temperature of the light-emitting module and the correspondence between the temperature and brightness of the light-emitting module includes: The first temperature threshold and the second temperature threshold are determined based on the correspondence between temperature and brightness. If the temperature of the light-emitting module is less than a first temperature threshold, the temperature control voltage is a first preset value; if the temperature of the light-emitting module is greater than or equal to the first temperature threshold and less than a second temperature threshold, the temperature control voltage is a second preset value; if the temperature of the light-emitting module is greater than or equal to the second temperature threshold, the temperature control voltage is a third preset value; the first preset value is greater than the second preset value, and the second preset value is greater than the third preset value. Preferably, the first preset value is negatively correlated with the rate at which the brightness of the light-emitting module decays with temperature; Preferably, the second preset value is negatively correlated with the rate at which the brightness of the light-emitting module decays with temperature; Preferably, the third preset value is zero.

10. The display method of the display panel according to claim 8, characterized in that, The display panel includes multiple rows of the pixel circuits; The transmission of the temperature control voltage to the temperature compensation sub-circuit of each pixel circuit includes: The temperature control voltage is transmitted line by line to the temperature compensation sub-circuit of the pixel circuit; The process further includes, after transmitting the temperature control voltage to the temperature compensation sub-circuit of the pixel circuit in one row: A data voltage is transmitted to the driving sub-circuit of the pixel circuit described in a row, the data voltage being used to control the amplitude and / or pulse width of the driving current.

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