Display panel and display device

Abstract

This application provides a display panel and display device, including multiple pixel circuits and multiple light-emitting devices. The output terminals of the pixel circuits are electrically connected to the light-emitting devices and are used to transmit driving current to the light-emitting devices. The pixel circuits include: a driving module, a writing module electrically connected to the driving module and used to write data voltage to a first terminal of the driving module, and a light-emitting control module electrically connected between the driving module and the light-emitting devices and used to control the conduction state between the driving module and the light-emitting devices. At least a portion of the pixel circuits also include MOS capacitors, which are used to suppress brightness changes of the light-emitting devices when the temperature of the display panel changes. By using MOS capacitors to adjust the brightness of the light-emitting devices, the display brightness and display effect of the display panel have better stability. Furthermore, by compensating for the brightness of the light-emitting devices at low or high temperatures based on the temperature dependence of the MOS capacitors, the compensation effect is more accurate and timely.

Description

Technical Field

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

[0002] Brightness stability is a crucial indicator for evaluating display panel performance, and temperature significantly affects its luminous intensity. When the brightness of a display panel changes noticeably with temperature variations, it negatively impacts the user experience. Furthermore, if different color pixels within the display panel exhibit varying degrees of temperature-dependent brightness changes, it can lead to color shift issues.

[0003] To address the aforementioned issues, the array layer of display panels typically employs low-temperature processes to fabricate semiconductor switches. This reduces the degree to which the threshold and subthreshold swings of the semiconductor switches drift with temperature, effectively mitigating the impact of temperature on the display panel's brightness by improving the temperature sensitivity of the semiconductor switches. Furthermore, existing technologies also adjust the structure of the light-emitting devices within the display panel to alter their temperature-sensitive characteristics, further reducing the influence of temperature on the display panel's brightness.

[0004] However, the improvement effect of low-temperature semiconductor processes on the above problems is limited. Adjusting the structure of light-emitting devices requires prioritizing performance such as lifespan and efficiency, which limits the improvement effect of this method on the above problems; and once the material selection of light-emitting devices (such as organic light-emitting diodes) is finalized, the space for optimizing the structure of light-emitting devices is limited. Summary of the Invention

[0005] In view of this, embodiments of this application provide a display panel and a display device to solve the above problems.

[0006] In a first aspect, an embodiment of this application provides a display panel, including multiple pixel circuits and multiple light-emitting devices. The output terminal of the pixel circuit is electrically connected to the light-emitting devices and is used to transmit driving current to the light-emitting devices. The pixel circuit includes: Driver module; The write module is electrically connected to the drive module and is used to write data voltage to the first terminal of the drive module. The light-emitting control module is electrically connected between the driving module and the light-emitting device and is used to control the conduction state between the driving module and the light-emitting device. At least some of the pixel circuits also include MOS capacitors, which are used to suppress brightness changes of the light-emitting devices when the temperature of the display panel changes.

[0007] In one implementation of the first aspect, the driving module, the writing module, and the light-emitting control module all include transistors; A MOS capacitor includes a first plate and a second plate. The first plate is located on the same layer as the semiconductor film of the transistor, and the second plate is located on the same layer as the gate of the transistor.

[0008] In one implementation of the first aspect, the MOS capacitor is used to reduce the brightness of the light-emitting device when the temperature of the display panel increases and to increase the brightness of the light-emitting device when the temperature of the display panel decreases.

[0009] In one implementation of the first aspect, the first plate of the MOS capacitor is electrically connected to the first electrode of the light-emitting device; MOS capacitors are used to reduce the absolute value of the voltage between the first and second electrodes of a light-emitting device when the temperature rises.

[0010] In one implementation of the first aspect, the light-emitting control module includes a light-emitting control transistor, which is a P-channel transistor; The first plate of the MOS capacitor is electrically connected to the anode of the light-emitting device, and the second plate of the MOS capacitor is electrically connected to the gate of the light-emitting control transistor.

[0011] In one implementation of the first aspect, the light-emitting control module includes a light-emitting control transistor, which is an N-channel transistor; The first plate of the MOS capacitor is electrically connected to the cathode of the light-emitting device, and the second plate of the MOS capacitor is electrically connected to the gate of the light-emitting control transistor.

[0012] In one implementation of the first aspect, the driving module includes a driving transistor, and the writing module includes a writing transistor, wherein the writing transistor is electrically connected to the gate of the driving transistor and is used to write a data voltage to the gate of the driving transistor. In this configuration, the driving transistor and the writing transistor have the same channel type, the first plate of the MOS capacitor is electrically connected to the gate of the driving transistor, and the second plate of the MOS capacitor is electrically connected to the gate of the writing transistor.

[0013] In one implementation of the first aspect, the plurality of pixel circuits includes a first pixel circuit and a second pixel circuit, and both the first pixel circuit and the second pixel circuit include MOS capacitors. The capacitance value of the MOS capacitor in the first pixel circuit is different from that in the second pixel circuit.

[0014] In one implementation of the first aspect, the plurality of pixel circuits includes a first pixel circuit and a third pixel circuit; The first pixel circuit includes a MOS capacitor, while the third pixel circuit does not include a MOS capacitor.

[0015] Secondly, embodiments of this application provide a display device, including a display panel as provided in the first aspect.

[0016] The technical solution provided in this application utilizes the fact that the capacitance of a MOS capacitor changes with temperature to adjust the brightness of the light-emitting device. This allows the display panel to have better stability in terms of brightness and display effect, adapting to a wider temperature range. Furthermore, a greater degree of temperature change leads to a greater degree of brightness change in the light-emitting device, and a greater degree of temperature change also leads to a greater change in the capacitance of the MOS capacitor. Therefore, compensating for the brightness of the light-emitting device at low or high temperatures based on the temperature dependence of the MOS capacitor results in a more accurate and timely compensation effect. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a display panel provided in an embodiment of this application; Figure 2 A schematic diagram of a pixel circuit provided in an embodiment of this application; Figure 3 This is a schematic diagram of the CV curve of the MOS capacitor C0 related to the embodiments of this application; Figure 4 This is a partial cross-sectional schematic diagram of a display panel provided in an embodiment of this application; Figure 5 A schematic diagram of a pixel circuit provided in an embodiment of this application; Figure 6 A schematic diagram of a pixel circuit provided in an embodiment of this application; Figure 7 A schematic diagram of a pixel circuit provided in an embodiment of this application; Figure 8 A schematic diagram of a pixel circuit provided in an embodiment of this application; Figure 9 A schematic diagram of a display panel provided in an embodiment of this application; Figure 10 A schematic diagram of a display panel provided in an embodiment of this application; Figure 11 A schematic diagram of a display panel provided in an embodiment of this application; Figure 12 This is a schematic diagram of a display device provided in an embodiment of this application. Detailed Implementation

[0019] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0020] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0021] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms "a" and "the" as used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0022] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0023] In the description of this specification, it should be understood that the terms "substantially", "approximately", "about", "about", "roughly", "generally" and "generally" used in the claims and embodiments of this application refer to values ​​that can be generally agreed upon within a reasonable range of process operations or tolerances, rather than a precise value.

[0024] It should be understood that although the terms "first," "second," etc., may be used to describe pixel circuits and light-emitting devices in the embodiments of this application, these should not be limited to these terms. These terms are only used to distinguish pixel circuits from each other. For example, without departing from the scope of the embodiments of this application, a first pixel circuit may also be referred to as a second pixel circuit, and similarly, a second pixel circuit may also be referred to as a first pixel circuit. Through meticulous and in-depth research, the applicant of this application has provided a solution to the problems existing in the prior art.

[0025] Figure 1 This is a schematic diagram of a display panel provided in an embodiment of this application. Figure 1As shown, the display panel 01 includes multiple pixel circuits 10 and multiple light-emitting devices 20. The output terminals of the pixel circuits 10 are electrically connected to the light-emitting devices 20. In some implementations, the light-emitting device 20 can be an organic light-emitting diode (OLED), a micro-LED, a miniature light-emitting diode (Mini-LED), etc. The light-emitting device 20 includes a first electrode 21 and a second electrode 22. One of the first electrode 21 and the second electrode 22 can be a cathode, and the other can be an anode. The output terminals of the pixel circuits 10 are electrically connected to the light-emitting device 20 through electrical connection with the first electrode 21.

[0026] It should be noted that, Figure 1 The connection configuration between the pixel circuit 10 and the light-emitting device 20 is not limited, nor is the structure of the pixel circuit 10 and the light-emitting device 20 limited.

[0027] Figure 2 This is a schematic diagram of a pixel circuit module provided in an embodiment of this application. Figure 2 As shown, the pixel circuit 10 includes a driving module 11, a writing module 12, and a light-emitting control module 13. The writing module 12 is electrically connected to the driving module 11 and is used to write data voltage to the first terminal 110 of the driving module 11. The light-emitting control module 13 is electrically connected between the driving module 11 and the light-emitting device 20 and is used to control the conduction state between the driving module 11 and the light-emitting device 20. Therefore, the driving module 11 is configured to achieve electrical connection with the light-emitting device 20 based on the activation of the light-emitting control module 13, and the driving module 11 is configured to drive the light-emitting device 20 to emit different brightness levels based at least on receiving different data voltages at its first terminal 110.

[0028] It should be noted that, Figure 2 The following figures illustrate the use of a light-emitting diode (LED) as the light-emitting device 20. However, the light-emitting device 20 can also be of other types besides LEDs.

[0029] Among them, such as Figure 2 As shown, at least part of the pixel circuit 10 also includes a MOS capacitor C0. The voltage correlation coefficient of the MOS capacitor C0 is relatively large, and its capacitance value will change significantly with the change of the voltage received by the electrode plate. This change can be illustrated by a CV curve. Figure 3 As shown, Figure 3 This is a schematic diagram of the CV curve of the MOS capacitor C0 related to an embodiment of this application. The relationship between the capacitance C of the MOS capacitor C0 and the plate voltage V changes with temperature. Figure 3The CV curves of the MOS capacitor C0 at 25°C and 50°C are illustrated. It can be seen that, with the plate voltage V of the MOS capacitor C0 remaining constant, the capacitance C of the MOS capacitor C0 increases at higher temperatures. This embodiment utilizes the above-mentioned characteristics of the MOS capacitor C0 to improve the problem of the brightness of the light-emitting device 20 in the display panel 01 changing with temperature.

[0030] In this embodiment, the MOS capacitor C0 is used to suppress the brightness change of the light-emitting device 20 when the temperature of the display panel 01 changes. That is, the MOS capacitor C0 can suppress the increase in brightness of the light-emitting device 20 when the brightness of the light-emitting device 20 increases with the temperature change of the display panel 01; and / or, the MOS capacitor C0 can also suppress the decrease in brightness of the light-emitting device 20 when the brightness of the light-emitting device 20 decreases with the temperature change of the display panel 01.

[0031] The technical solution provided in this application utilizes the fact that the capacitance of the MOS capacitor C0 changes with temperature to adjust the brightness of the light-emitting device 20, thereby minimizing the increase or decrease in brightness of the light-emitting device 20 due to temperature variations, and suppressing the change in brightness of the light-emitting device 20 with temperature. Therefore, the technical solution of this application can enable the display panel 01 to have better stability in display brightness and display effect, adapting to a wider temperature range. Furthermore, a greater degree of temperature change will result in a greater degree of brightness change in the light-emitting device 20, and a greater degree of temperature change will also result in a greater change in the capacitance of the MOS capacitor C0. Therefore, compensating for the brightness of the light-emitting device 20 at low or high temperatures based on the temperature dependence of the MOS capacitor C0 provides a more accurate and timely compensation effect.

[0032] Figure 4 This is a partial cross-sectional schematic diagram of a display panel provided in an embodiment of this application. For example... Figure 4 As shown, the pixel circuit 10 may include multiple transistors T0. For example, the driving module 11, the writing module 12, and the light emission control module 13 may all include transistors T0.

[0033] The MOS capacitor C0 includes a first plate 31 and a second plate 32. The first plate 31 is located on the same layer as the semiconductor film S0 of the transistor T0, and the second plate 32 is located on the same layer as the gate G0 of the transistor T0. Therefore, the dielectric layer between the first plate 31 and the second plate 32 of the MOS capacitor C0 can also be located on the same layer as the gate insulating layer between the gate G0 of the transistor T0 and the semiconductor film S0.

[0034] In this embodiment, the MOS capacitor C0 can be fabricated in the same process as a portion of the transistor T0. Specifically, the first electrode 31 of the MOS capacitor C0 can be fabricated simultaneously with the semiconductor film S0 of the transistor T0, the second electrode 32 can be fabricated simultaneously with the gate G0 of the transistor T0, and the dielectric layer can be fabricated simultaneously with the gate insulating layer. Furthermore, to achieve sensitive control of the channel in the semiconductor film S0 by the gate G0 of the transistor T0, the thickness of the gate insulating layer between the gate G0 and the semiconductor film S0 is relatively thin. Therefore, with the first electrode 31 of the MOS capacitor C0 and the semiconductor film S0 of the transistor T0 located in the same layer, and the second electrode 32 and the gate G0 of the transistor T0 located in the same layer, it is easier to obtain a MOS capacitor C0 with a larger capacitance value.

[0035] It should be noted that the MOS capacitor C0 in this embodiment is significantly different from the parasitic capacitance of transistor T0. For example... Figure 4 As shown, the first electrode 31 of the MOS capacitor C0 does not overlap with the gate G0 of the transistor T0 in a direction perpendicular to the plane of the display panel O1, and the second electrode 32 of the MOS capacitor C0 does not overlap with the channel of the transistor T0 in a direction perpendicular to the plane of the display panel O1. Furthermore, no other conductive film layers are present between the first electrode 31, which is co-layered with the semiconductor film S0, and the second electrode 32, which is co-layered with the gate G0, in the MOS capacitor C0.

[0036] The light-emitting characteristics of the light-emitting device 20 generally exhibit that its brightness increases with increasing temperature. Taking an organic light-emitting diode (OLED) as an example, the temperature-sensitive characteristic of an OLED is that when the temperature rises, the mobility of charge carriers such as holes and electrons in the organic light-emitting layer increases, resulting in an increase in the brightness of the OLED; when the temperature decreases, the mobility of charge carriers such as holes and electrons in the organic light-emitting layer decreases, resulting in a decrease in the brightness of the OLED. In one embodiment of this application, the MOS capacitor C0 is used to reduce the brightness of the light-emitting device 20 when the temperature rises and to increase the brightness of the light-emitting device 20 when the temperature falls. That is, in the display panel 01 provided in this embodiment, the MOS capacitor C0 included in the pixel circuit 10 is configured to suppress the increase in brightness of the light-emitting device 20 due to high temperature when the temperature of the display panel 01 rises and to suppress the decrease in brightness of the light-emitting device 20 due to low temperature when the temperature of the display panel 01 falls.

[0037] Figure 5 This is a schematic diagram of a pixel circuit provided in an embodiment of this application.

[0038] like Figure 5As shown, in one embodiment of this application, the driving module 11 includes a driving transistor M1, the writing module 12 includes writing transistors M2 and M3, and the light-emitting control module 13 includes a light-emitting control transistor M4. The first terminal of the writing transistor M2 is electrically connected to the data line L1 that transmits the data voltage, and the second terminal of the writing transistor M2 is electrically connected to the first terminal of the driving transistor M1. The first terminal of the writing transistor M3 is electrically connected to the second terminal of the driving transistor M1, and the second terminal of the writing transistor M3 is electrically connected to the gate of the driving transistor M1. Therefore, during at least a portion of the time when both writing transistors M2 and M3 are turned on, the data voltage can be transmitted to the gate of the driving transistor M1, wherein the gate of the driving transistor M1 is electrically connected to the first terminal 110 of the driving module 11. The light-emitting control transistor M4 is electrically connected between the driving transistor M1 and the light-emitting device 20. When the light-emitting control transistor M4 is turned on, it can electrically connect the second terminal of the driving transistor M1 to the light-emitting device 20.

[0039] In addition, the pixel circuit 10 may also include a power supply voltage writing transistor M5, a first reset transistor M6, a second reset transistor M7, and a storage capacitor C1. The power supply voltage writing transistor M5 is electrically connected between the first power supply voltage line L2 and the driving transistor M1. When the power supply voltage writing transistor M5 is turned on, it can transmit the power supply voltage transmitted on the first power supply voltage line L2 to the first electrode of the driving transistor M1. The first electrodes of the first reset transistor M6 and the second reset transistor M7 are both electrically connected to the reset signal line L3, and the second electrodes of the first reset transistor M6 and the second reset transistor M7 are respectively electrically connected to the gate of the driving transistor M1 and the first electrode 21 of the light-emitting device 20. Thus, when the first reset transistor M6 is turned on, it can reset the gate of the driving transistor M1, and when the second reset transistor M7 is turned on, it can reset the first electrode 21 of the light-emitting device 20. Furthermore, one plate of the storage capacitor C1 can be electrically connected to the first power supply voltage line L2, and the other plate can be electrically connected to the gate of the driving transistor M1.

[0040] In one embodiment of this application, the first plate 31 of the MOS capacitor C0 is electrically connected to the first electrode 21 of the light-emitting device 20. The MOS capacitor C0 then affects the potential of the first electrode 21 when the light-emitting device 20 emits light, thereby compensating for the brightness change of the light-emitting device 20 due to temperature variations caused by its temperature-sensitive characteristics. Specifically, the MOS capacitor C0 is used to reduce the absolute value of the voltage between the first electrode 21 and the second electrode 22 of the light-emitting device 20 when the temperature of the display panel 01 increases.

[0041] When the temperature of the display panel 01 increases, the brightness of the light-emitting device 20 tends to increase due to the increase in carrier mobility. The MOS capacitor C0 reduces the current through the light-emitting device 20 by controlling the voltage between the first electrode 21 and the second electrode 22 of the light-emitting device 20, thereby preventing the brightness of the light-emitting device 20 from increasing due to the temperature of the display panel 01 or reducing the degree to which the brightness of the light-emitting device 20 increases due to the temperature of the display panel 01.

[0042] In one embodiment of this application, such as Figure 5 As shown, the light-emitting control module 13 includes a light-emitting control transistor M4, which is a P-channel transistor. The light-emitting control transistor M4 is turned on when the control voltage received at its gate is low and turned off when the control voltage received at its gate is high.

[0043] In this embodiment, the first electrode 21 of the light-emitting device 20 is the anode, the first plate 31 of the MOS capacitor C0 is electrically connected to the anode of the light-emitting device 20, and the second plate 32 of the MOS capacitor C0 is electrically connected to the gate of the light-emitting control transistor M4. When the light-emitting control transistor M4 switches from an off state to an on state to control the driving transistor M1 to drive the light-emitting device 20 to emit light, the gate potential of the light-emitting control transistor M4 changes from high to low. The coupling effect of the MOS capacitor C0 pulls down the anode potential of the light-emitting device 20. Furthermore, the capacitance of the MOS capacitor C0 increases with the increase of the temperature of the display panel O1, meaning that the pulling effect on the anode potential of the light-emitting device 20 becomes stronger, further causing the anode potential to be pulled down even more with the increase of the temperature of the display panel O1.

[0044] In this embodiment, the MOS capacitor C0 is configured such that when the temperature of the display panel 01 rises, the absolute value of the voltage between the anode and cathode of the light-emitting device 20 decreases.

[0045] Figure 6 This is a schematic diagram of a pixel circuit provided in an embodiment of this application. Figure 6 and Figure 5 The differences include: Figure 6 The first electrode of the light-emitting device 20 is electrically connected to the first electrode of the driving transistor M4, and Figure 5 The first electrode of the light-emitting device 20 is electrically connected to the second electrode of the driving transistor M4.

[0046] In one embodiment of this application, such as Figure 6 As shown, the light-emitting control module 13 includes a light-emitting control transistor M4, which is an N-channel transistor. The light-emitting control transistor M4 is turned on when the control voltage received at its gate is high and turned off when the control voltage received at its gate is low.

[0047] In this embodiment, the first electrode 21 of the light-emitting device 20 is the cathode, the first plate 31 of the MOS capacitor C0 is electrically connected to the cathode of the light-emitting device 20, and the second plate 32 of the MOS capacitor C0 is electrically connected to the gate of the light-emitting control transistor M4. When the light-emitting control transistor M4 switches from an off state to an on state to control the driving transistor M1 to drive the light-emitting device 20 to emit light, the gate potential of the light-emitting control transistor M4 changes from low to high. The coupling effect of the MOS capacitor C0 pulls up the cathode potential of the light-emitting device 20. Furthermore, the capacitance of the MOS capacitor C0 increases with the increase of the temperature of the display panel 01, thereby causing the anode potential to be pulled up even more with the increase of the temperature of the display panel 01.

[0048] In this embodiment, the MOS capacitor C0 is configured such that when the temperature of the display panel 01 rises, the absolute value of the voltage between the anode and cathode of the light-emitting device 20 decreases.

[0049] Figure 7 This is a schematic diagram of a pixel circuit provided in an embodiment of this application. Figure 8 This is a schematic diagram of a pixel circuit provided in an embodiment of this application.

[0050] In one embodiment of this application, the driving module 11 includes a driving transistor M1, and the writing module 12 includes writing transistors M2 and M3. At least one writing transistor is electrically connected to the gate of the driving transistor M1 and is used to write a data voltage to the gate of the driving transistor M1. In this embodiment, the first plate 31 of the MOS capacitor C0 is electrically connected to the gate of the driving transistor M1, and the second plate 32 of the MOS capacitor C0 is electrically connected to the gate of the writing transistor electrically connected to the gate of the driving transistor M1. Therefore, the MOS capacitor can regulate the driving current generated by the driving transistor M1 by adjusting the potential of the gate of the driving transistor M1. For example, as... Figure 7 and Figure 8 As shown, in pixel circuit 10, the write transistor M3 is electrically connected to the gate of the drive transistor M1, and the write transistor M3 is used to write data voltage to the gate of the drive transistor. The first plate of the MOS capacitor C0 is electrically connected to the gate of the drive transistor M1, and the second plate of the MOS capacitor is electrically connected to the gate of the write transistor M3. Therefore, the MOS capacitor can couple and regulate the potential of the gate of the drive transistor M1 in response to the potential change of the gate of the write transistor M3. Furthermore, the degree of regulation of the drive current generated by the drive transistor M1 by the MOS capacitor changes with the temperature of the display panel, thereby improving the problem of the brightness of the light-emitting device 20 changing with temperature.

[0051] It should be noted that when the gate of the driving transistor M1 is electrically connected to the write transistor, and the semiconductor film of the write transistor is electrically connected to the gate of the driving transistor M1, the first plate 31 of the MOS capacitor is also electrically connected to the gate of the driving transistor M1 through the semiconductor film. For example, if the first plate 31 of the MOS capacitor is on the same layer as and connected to the semiconductor film of the write transistor M3, when the semiconductor film of the write transistor M3 is electrically connected to the gate of the driving transistor M1, the first plate 31 of the MOS capacitor is also electrically connected to the gate of the driving transistor M1.

[0052] Among them, the channel type of the drive transistor M1 is the same as that of the write transistor that is electrically connected to the gate of the drive transistor M1.

[0053] In one implementation, such as Figure 7 As shown, when the driving transistor M1 is a P-channel transistor, the write transistor M3, which is electrically connected to the gate of the driving transistor M1, is also a P-channel transistor. At the end of the data writing phase, the gate potential of the write transistor M3 changes from low to high, and through the coupling effect of the MOS capacitor, the gate potential of the driving transistor M1 changes from low to high. Since the data voltage is written to the gate of the driving transistor, the data voltage is negatively correlated with the driving current; therefore, the MOS capacitor can regulate the driving current. Furthermore, the degree to which the MOS capacitor regulates the driving current varies with the temperature of the display panel. For example, the brightness of the light-emitting device 20 increases with increasing temperature; in this case, the MOS capacitor can reduce the driving current more significantly when the temperature increases. Conversely, the brightness of the light-emitting device 20 decreases with decreasing temperature; in this case, the MOS capacitor can reduce the driving current less significantly when the temperature decreases. This ensures that the display panel 01 does not exhibit significant brightness changes at different temperatures.

[0054] In one implementation, such as Figure 8As shown, when the driving transistor M1 is an N-channel transistor, the write transistor M3, which is electrically connected to the gate of the driving transistor M1, is also an N-channel transistor. At the end of the data writing phase, the gate potential of the write transistor M3 decreases from high to low, and through the coupling effect of the MOS capacitor, the gate potential of the driving transistor M1 decreases from high to low. Since the data voltage is written to the gate of the driving transistor, the data voltage is negatively correlated with the driving current; therefore, the MOS capacitor can regulate the driving current. Furthermore, the degree to which the MOS capacitor regulates the driving current varies with the temperature of the display panel. For example, the brightness of the light-emitting device 20 increases with increasing temperature; in this case, the MOS capacitor can reduce the driving current more significantly when the temperature increases. Conversely, the brightness of the light-emitting device 20 decreases with decreasing temperature; in this case, the MOS capacitor can reduce the driving current less significantly when the temperature decreases. This ensures that the display panel 01 does not exhibit significant brightness changes at different temperatures.

[0055] Figure 9 This is a schematic diagram of a display panel provided in an embodiment of this application.

[0056] In one embodiment of this application, such as Figure 9 As shown, the multiple pixel circuits 10 include a first pixel circuit 10a and a second pixel circuit 10b, both of which include a MOS capacitor C0. The capacitance value of the MOS capacitor C0 in the first pixel circuit 10a is different from that in the second pixel circuit 10b. This difference in capacitance can be achieved by differentiating the first electrode 31 of the MOS capacitor C0 in the first pixel circuit 10a and the first electrode 31 of the MOS capacitor C0 in the second pixel circuit 10b, and / or by differentiating the second electrode 32 of the MOS capacitor C0 in the first pixel circuit 10a and the second electrode 32 of the MOS capacitor C0 in the second pixel circuit 10b. For example, as... Figure 9 As shown, the MOS capacitor C0 in the first pixel circuit is the first MOS capacitor C1, and the MOS capacitor C0 in the second pixel circuit 10b is the second MOS capacitor C2. The capacitance values ​​of the first MOS capacitor C1 and the second MOS capacitor C2 are different.

[0057] By differentiating the design of the MOS capacitors C0 in different pixel circuits 10, these pixel circuits 10 can provide different brightness compensations for the light-emitting devices 20, adapting to the varying degrees of brightness changes in different light-emitting devices 20 due to temperature variations. For example, if the temperature of some fixed locations on the display panel 01 is different, the capacitance values ​​of the MOS capacitors C0 at these locations with different temperatures can be different, thereby achieving different degrees of compensation for the light-emitting devices 20 at these locations with different temperatures, and thus achieving uniform brightness across the entire display panel 01.

[0058] In one implementation, the plurality of light-emitting devices 20 includes a first light-emitting device 20a and a second light-emitting device 20b. The light-emitting color of the first light-emitting device 20a is different from the light-emitting color of the second light-emitting device 20b. For example, the first light-emitting device 20a is one of a red light-emitting device 20, a green light-emitting device 20, and a blue light-emitting device 20, and the second light-emitting device 20b is another of a red light-emitting device 20, a green light-emitting device 20, and a blue light-emitting device 20.

[0059] In this circuit, the first light-emitting device 20a is electrically connected to the first pixel circuit 10a, and the second light-emitting device 20b is electrically connected to the second pixel circuit 10b. Specifically, the capacitance value of the MOS capacitor C0 in the pixel circuit 10 to which the first light-emitting device 20a is electrically connected is different from the capacitance value of the MOS capacitor C0 in the pixel circuit 10 to which the second light-emitting device 20b is electrically connected. Since the brightness of different colored light-emitting devices 20 changes to different degrees with temperature variations, different levels of brightness compensation for these different colored light-emitting devices 20 are achieved by matching different MOS capacitors C0 to each pixel circuit 10.

[0060] For example, the brightness change of the red organic light-emitting diode when the temperature of the display panel 01 changes is significantly greater than that of the blue and green organic light-emitting diodes. Therefore, the capacitance value of the MOS capacitor C0 in the pixel circuit 10 to which the red organic light-emitting diode is electrically connected can be different from the capacitance value of the MOS capacitor C0 in the pixel circuit 10 to which the blue organic light-emitting diode is electrically connected, and / or different from the capacitance value of the MOS capacitor C0 in the pixel circuit 10 to which the green organic light-emitting diode is electrically connected.

[0061] Furthermore, the brightness of different colored light-emitting devices 20 varies with temperature depending on the manufacturing process and technology of the display panel 01. Therefore, based on the concept of this invention and the brightness of the light-emitting devices 20 in the display panel 01 with different manufacturing processes and technologies, the capacitance value of the MOS capacitor C0 in the pixel circuit 10 is set.

[0062] Figure 10This is a schematic diagram of a display panel provided in an embodiment of this application.

[0063] In one embodiment of this application, such as Figure 10 As shown, the multiple pixel circuits 10 include a first pixel circuit 10a and a third pixel circuit 10c. The first pixel circuit 10a includes a MOS capacitor C0 and the third pixel circuit 10c does not include a MOS capacitor C0. That is, some pixel circuits 10 in the display panel 01 include a MOS capacitor C0 and other pixel circuits 10 do not include a MOS capacitor C0.

[0064] By incorporating MOS capacitors C0 in some pixel circuits 10 and omitting them in others, a differentiated design of the pixel circuits 10 is achieved. This allows the differentiated pixel circuits 10 to provide varying degrees of brightness compensation to the light-emitting devices 20, adapting to differences in brightness caused by temperature variations. For example, some fixed locations on the display panel 01 may have different temperatures, and the pixel circuits 10 at these locations can differ. Specifically, some pixel circuits 10 may include MOS capacitors C0 while others may not, thus enabling brightness compensation for the light-emitting devices 20 at certain locations to reduce the brightness difference between these devices and those at other locations. Furthermore, this embodiment also reduces the design complexity of the pixel circuits 10 and avoids excessively increasing wiring complexity.

[0065] In one implementation, the plurality of light-emitting devices 20 include a first light-emitting device 20a and a third light-emitting device 20c. The light-emitting color of the first light-emitting device 20a is different from the light-emitting color of the third light-emitting device 20c. For example, the first light-emitting device 20a is one of a red light-emitting device 20, a green light-emitting device 20, and a blue light-emitting device 20, and the third light-emitting device 20c is another of a red light-emitting device 20, a green light-emitting device 20, and a blue light-emitting device 20.

[0066] In this circuit, the first light-emitting device 20a is electrically connected to the first pixel circuit 10a, and the third light-emitting device 20c is electrically connected to the third pixel circuit 10c. Specifically, the pixel circuit 10 to which the first light-emitting device 20a is electrically connected includes a MOS capacitor C0, while the pixel circuit 10 to which the third light-emitting device 20c is electrically connected does not include a MOS capacitor. Since the brightness of light-emitting devices 20 of different colors changes to different degrees with temperature variations, different pixel circuits 10 are matched to each color to achieve different levels of brightness compensation for these different colored light-emitting devices 20.

[0067] Furthermore, the brightness variation of different colored light-emitting devices 20 with temperature can vary depending on the manufacturing process and technology of the display panel 01. Therefore, based on the concept of this invention and the brightness variation of the light-emitting devices 20 with temperature in the display panel 01 with different manufacturing processes and technologies, it can be determined which pixel circuits 10 connected to the light-emitting devices 20 are equipped with MOS capacitors C0 and which pixel circuits 10 connected to the light-emitting devices 20 are not equipped with MOS capacitors C0.

[0068] Figure 11 This is a schematic diagram of a display panel provided in an embodiment of this application.

[0069] In one embodiment of this application, such as Figure 11 As shown, the multiple pixel circuits 10 include a first pixel circuit 10a, a second pixel circuit 10b, and a third pixel circuit 10c. The first pixel circuit 10a includes a first MOS capacitor C01, the second pixel circuit 10b includes a second MOS capacitor C02, and the third pixel circuit 10c does not include a MOS capacitor C0. That is, some pixel circuits 10 in the display panel 01 include a MOS capacitor C0, while other pixel circuits 10 do not include a MOS capacitor C0. The capacitance values ​​of the first MOS capacitor C01 and the second MOS capacitor C02 are different.

[0070] It should be noted that this application not only provides embodiments related to the basic inventive concept, but also provides embodiments related to multiple technical solutions extended from this basic inventive concept. Provided that these technical solutions do not conflict, the technical solutions obtained by combining them do not exceed the protection scope of this application. For example, Figure 9 , Figure 10 , Figure 11 The corresponding examples and examples are respectively Figure 5 , Figure 6 , Figure 7 , Figure 8 The corresponding embodiments are combined.

[0071] Figure 12 This is a schematic diagram of a display device provided in an embodiment of this application.

[0072] like Figure 12 As shown, this application embodiment also provides a display device 001, including the display panel 01 provided in any of the above embodiments. Of course, Figure 12 The display device 001 shown is merely illustrative. This display device 001 can be any electronic device with display functionality, such as a mobile phone, tablet computer, laptop computer, e-reader, television set, or video wall display device. The display device 001 provided in this application embodiment can maintain relatively stable display brightness when the temperature changes and can also adapt to environments with a large temperature range.

[0073] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A display panel, characterized by, The pixel circuit includes multiple pixel circuits and multiple light-emitting devices. The output terminal of each pixel circuit is electrically connected to the light-emitting device and is used to transmit driving current to the light-emitting device. The pixel circuit includes: Driver module; A writing module, which is electrically connected to the driving module and is used to write data voltage to a first terminal of the driving module; A light-emitting control module is electrically connected between the driving module and the light-emitting device and is used to control the conduction state between the driving module and the light-emitting device; The pixel circuitry further includes at least a portion of a MOS capacitor, which is used to suppress brightness changes of the light-emitting device when the temperature of the display panel changes. The driving module, the writing module, and the light-emitting control module all include transistors; The MOS capacitor includes a first plate and a second plate. The first plate is located on the same layer as the semiconductor film of the transistor, and the second plate is located on the same layer as the gate of the transistor.

2. The display panel of claim 1, wherein, The MOS capacitor is used to reduce the brightness of the light-emitting device when the temperature of the display panel increases and to increase the brightness of the light-emitting device when the temperature of the display panel decreases.

3. The display panel of claim 2, wherein, The first plate of the MOS capacitor is electrically connected to the first electrode of the light-emitting device. The MOS capacitor is used to reduce the absolute value of the voltage between the first electrode and the second electrode of the light-emitting device when the temperature rises.

4. The display panel of claim 1 or 3, wherein, The light-emitting control module includes a light-emitting control transistor, which is a P-channel transistor. The first plate of the MOS capacitor is electrically connected to the anode of the light-emitting device, and the second plate of the MOS capacitor is electrically connected to the gate of the light-emitting control transistor.

5. The display panel of claim 1 or 3, wherein, The light-emitting control module includes a light-emitting control transistor, which is an N-channel transistor. The first plate of the MOS capacitor is electrically connected to the cathode of the light-emitting device, and the second plate of the MOS capacitor is electrically connected to the gate of the light-emitting control transistor.

6. The display panel of claim 2, wherein, The driving module includes a driving transistor, the writing module includes a writing transistor, and at least one of the writing transistors is electrically connected to the gate of the driving transistor and is used to write the data voltage to the gate of the driving transistor. The driving transistor and the write transistor electrically connected to the gate of the driving transistor have the same channel type. The first plate of the MOS capacitor is electrically connected to the gate of the driving transistor, and the second plate of the MOS capacitor is electrically connected to the gate of the write transistor electrically connected to the gate of the driving transistor.

7. The display panel of claim 1, wherein, The plurality of pixel circuits includes a first pixel circuit and a second pixel circuit, and both the first pixel circuit and the second pixel circuit include MOS capacitors; The capacitance value of the MOS capacitor in the first pixel circuit is different from the capacitance value of the MOS capacitor in the second pixel circuit.

8. The display panel of claim 1, wherein, The plurality of pixel circuits includes a first pixel circuit and a third pixel circuit; The first pixel circuit includes the MOS capacitor, while the third pixel circuit does not include the MOS capacitor.

9. A display device, characterized by comprising: A display panel comprising any one of claims 1-8.

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