Display panel, display panel brightness compensation method and device

Abstract

The application discloses a display panel, a brightness compensation method and device of the display panel. The display panel comprises a first display area and a second display area, the first display area is provided with a first pixel circuit, the first pixel circuit comprises a first driving transistor, a first electrode of the first driving transistor is connected with a power supply signal line, a second electrode of the first driving transistor is connected with a first light emitting device; a first gate electrode is used for writing a data voltage; the first driving transistor further comprises a second gate electrode; the second gate electrode is used for connecting an adjusting voltage; and / or, the first pixel circuit further comprises a first transistor, the first transistor is connected between the first gate electrode and the second electrode of the first driving transistor; the first transistor comprises a third gate electrode and a fourth gate electrode, the third gate electrode is used for writing a scanning signal, and the fourth gate electrode is used for connecting the adjusting voltage. The display uniformity of the first display area and the second display area can be improved, and the display effect of the display panel is improved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and more particularly to a display panel, a brightness compensation method and apparatus for the display panel. Background Technology

[0002] Current display panels are evolving towards full-screen designs to increase screen-to-body ratio and improve user experience. In full-screen displays, a transparent area with high light transmittance is needed to house structures such as cameras. To ensure the transmittance of this transparent area, the aperture ratio of its pixels can be reduced. When the aperture ratio is reduced, the driving current of pixels in the transparent area can be set higher than that of pixels in the regular display area at the same grayscale, ensuring that both areas have similar brightness and color, thus improving display uniformity. However, because the driving current of pixels in the transparent area is higher than that in the regular area, the current density of the light-emitting devices in the transparent area is also higher, leading to faster aging of these devices. As the display panel ages, the luminous efficiency of the light-emitting devices in the transparent area decreases faster than that in the regular area, resulting in differences in brightness and color between the two areas and ultimately reducing the overall display quality. Summary of the Invention

[0003] This invention provides a display panel, a brightness compensation method for the display panel, and an apparatus for the display panel, so as to improve the display uniformity and display effect of the display panel.

[0004] In a first aspect, embodiments of the present invention provide a display panel, including a first display area and a second display area, wherein the second display area at least partially surrounds the first display area, and the light transmittance of the first display area is greater than the light transmittance of the second display area;

[0005] The first display area is provided with a first pixel circuit, the first pixel circuit includes a first driving transistor, the first driving transistor includes a first electrode, a second electrode and a first gate; the first electrode of the first driving transistor is connected to a power signal line, the second electrode of the first driving transistor is connected to a first light-emitting device; the first gate is used to write data voltage.

[0006] The first driving transistor further includes a second gate; the second gate is used to receive an adjustment voltage; and / or, the first pixel circuit further includes a first transistor, the first transistor being connected between the first gate and the second terminal of the first driving transistor; the first transistor includes a third gate and a fourth gate, the third gate being used to write a scan signal, and the fourth gate being used to receive the adjustment voltage.

[0007] Optionally, the display panel further includes a non-display area, which is provided with a driving chip. The driving chip is used to determine the adjustment voltage based on the first light emission data of the first display area and the second light emission data of the second display area. The first display area is provided with a plurality of first pixel circuits, and each of the second gate and / or the fourth gate is respectively connected to the driving chip through a conductive line.

[0008] Optionally, the display panel further includes a first voltage signal line; the second display area is provided with a second pixel circuit, the second pixel circuit includes a second driving transistor, the second driving transistor includes a first electrode, a second electrode and a fifth gate; the first electrode of the second driving transistor is connected to the power signal line, the second electrode of the second driving transistor is connected to the second light-emitting device, and the fifth gate is used to write the data voltage;

[0009] The second driving transistor further includes a sixth gate, which is connected to the first voltage signal line; and / or, the display panel further includes a second voltage signal line; the second pixel circuit further includes a second transistor, which is connected between the first gate and the second electrode of the second driving transistor; the second transistor includes a seventh gate and an eighth gate, the seventh gate being used to write the scan signal, and the eighth gate being connected to the second voltage signal line.

[0010] Optionally, the power signal line is multiplexed as the first voltage signal line.

[0011] Secondly, embodiments of the present invention also provide a brightness compensation method for a display panel, used to compensate for the brightness of the display panel described in the first aspect; comprising:

[0012] Acquire the first light emission data of the first display area and the second light emission data of the second display area;

[0013] The adjustment voltage of the first display area is determined based on the first light emission data and the second light emission data;

[0014] Adjust the second gate voltage of the first driving transistor within the first display area according to the adjustment voltage to compensate for the brightness of the first display area; and / or,

[0015] The fourth gate voltage of the first transistor in the first display area is adjusted according to the adjustment voltage to compensate for the brightness of the first display area.

[0016] Optionally, the first light emission data includes first brightness data, and the second light emission data includes second brightness data; determining the adjustment voltage of the first display area based on the first light emission data and the second light emission data includes:

[0017] The current of the first driving transistor in the first display area is determined based on the first brightness data and the first efficiency decay curve; wherein, the first efficiency decay curve is the efficiency decay curve of the first light-emitting unit in the first display area.

[0018] The current of the second driving transistor in the second display area is determined based on the second brightness data and the second efficiency decay curve; wherein, the second efficiency decay curve is the efficiency decay curve of the second light-emitting unit in the second display area;

[0019] The adjustment voltage of the first display area is determined based on the difference between the current current of the first driving transistor in the first display area and the current current of the second driving transistor in the second display area.

[0020] Optionally, before determining the adjustment voltage of the first display area based on the first emission data and the second emission data, the method further includes:

[0021] Obtain the first cumulative light emission time of the first light-emitting unit in the first display area and the second cumulative light emission time of the second light-emitting unit in the second display area;

[0022] The first efficiency decay curve is determined based on the first cumulative emission time;

[0023] The second efficiency decay curve is determined based on the second cumulative emission time.

[0024] Optionally, the display panel includes pixel units, each pixel unit including at least two light-emitting units of two different colors; the first light-emitting data includes first chromaticity data, and the second light-emitting data includes second chromaticity data; determining the adjustment voltage of the first display area based on the first light-emitting data and the second light-emitting data includes:

[0025] The luminous brightness of the light-emitting units of different luminous colors in the first display area and the second display area is determined based on the first chromaticity data and the second chromaticity data.

[0026] The current difference of the driving transistors in the first display area and the second display area is determined based on the luminous brightness and the efficiency decay curves of the luminous units with different luminous colors.

[0027] The adjustment voltage of the first display area is determined based on the current difference.

[0028] Optionally, the first display area includes at least two sub-regions, each of which includes at least one pixel circuit; the adjustment voltages corresponding to the different sub-regions are different.

[0029] Thirdly, embodiments of the present invention also provide a brightness compensation device for a display panel, used to compensate the brightness of the display panel described in the first aspect; comprising:

[0030] The acquisition module is used to acquire the first light emission data of the first display area and the second light emission data of the second display area;

[0031] The determining module is used to determine the adjustment voltage of the first display area based on the first light emission data and the second light emission data;

[0032] The compensation module is configured to adjust the second gate voltage of the first driving transistor within the first display area according to the adjustment voltage, in order to compensate for the brightness of the first display area; and / or,

[0033] The fourth gate voltage of the first transistor in the first display area is adjusted according to the adjustment voltage to compensate for the brightness of the first display area.

[0034] The technical solution of this invention, by setting a first driving transistor including a second gate and connecting the second gate to an adjustable voltage, can adjust the threshold voltage of the first driving transistor to adjust the driving current of the first driving transistor; and / or, by setting a fourth gate of the first transistor to an adjustable voltage, the threshold voltage of the first transistor can be adjusted, thereby adjusting the amount of charge written by the first transistor to the first gate, i.e., adjusting the potential of the first gate, and thus adjusting the driving current of the first driving transistor; when the first light-emitting device in the first display area emits light according to the driving current of the first driving transistor, it can compensate for the difference in the light emission state with the second light-emitting device in the second display area, thereby compensating for the brightness of the first display area, improving the display uniformity of the first display area and the second display area, and thus improving the display effect of the display panel. Attached Figure Description

[0035] Figure 1 A schematic diagram of the structure of a display panel provided in the prior art;

[0036] Figure 2 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of a first pixel circuit provided in an embodiment of the present invention;

[0038] Figure 4 A characteristic curve of a driving transistor provided in an embodiment of the present invention;

[0039] Figure 5 A curve showing the relationship between the change in driving current and the change in the threshold voltage of the driving transistor is provided for an embodiment of the present invention.

[0040] Figure 6 This is a schematic diagram of another first pixel circuit provided in an embodiment of the present invention;

[0041] Figure 7 This is a schematic diagram of another first pixel circuit provided in an embodiment of the present invention;

[0042] Figure 8 This is a schematic diagram of another display panel structure provided in an embodiment of the present invention;

[0043] Figure 9 This is a partial structural diagram of a display panel provided in an embodiment of the present invention;

[0044] Figure 10 This is a partial structural schematic diagram of another display panel provided in an embodiment of the present invention;

[0045] Figure 11 A flowchart illustrating a brightness compensation method for a display panel provided in an embodiment of the present invention;

[0046] Figure 12 A flowchart of another brightness compensation method for a display panel provided in an embodiment of the present invention;

[0047] Figure 13 A flowchart of another brightness compensation method for a display panel provided in an embodiment of the present invention;

[0048] Figure 14 A flowchart of another brightness compensation method for a display panel provided in an embodiment of the present invention;

[0049] Figure 15 A flowchart of another brightness compensation method for a display panel provided in an embodiment of the present invention;

[0050] Figure 16 A brightness compensation device for a display panel is provided in an embodiment of the present invention. Detailed Implementation

[0051] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0052] Figure 1 A schematic diagram of the structure of a display panel provided by the prior art. For example... Figure 1 As shown, the display panel includes a conventional display area 101 and a transparent display area 102, with the conventional display area 101 surrounding the transparent display area 102. Because the conventional display area 101 surrounds the transparent display area 102, the display panel can form an offshore full-screen display panel. Within the full-screen display panel, pixel units are provided in both the conventional display area 101 and the transparent display area 102. Each pixel unit includes a pixel driving circuit and a light-emitting device. The light-emitting device includes an anode, a light-emitting layer, and a cathode. The pixel driving circuit provides a driving signal to the anode of the light-emitting device, causing the light-emitting device to emit light according to the driving signal, thereby realizing the display in the conventional display area 101 and the transparent display area 102. In the prior art, the anode material of the light-emitting device is a non-transparent material. For example, the light-emitting device is an organic electroluminescence display (OLED), and its anode material can be indium tin oxide (ITO) / silver (Ag) / ITO. By reducing the anode area occupied by the light-emitting device within the transparent display area 102, the light transmittance of the transparent display area 102 can be increased to ensure the light requirements of the light-sensing element (e.g., a camera) positioned relative to the transparent display area 102. When the anode area occupied by the light-emitting device within the transparent display area 102 decreases, the pixel aperture ratio of the transparent display area 102 also decreases, making the pixel aperture ratio of the transparent display area 102 smaller than that of the conventional display area 101.

[0053] When the display panel is in operation, the driving current provided by the pixel driving circuit in the transparent display area 102 can be set to be greater than that provided by the pixel driving circuit in the conventional display area 101. This compensates for the difference in brightness and color between the two areas caused by the lower pixel aperture ratio of the transparent display area 102 compared to the conventional display area 101, thus improving the display uniformity of the display panel. However, when the driving current provided by the pixel driving circuit in the transparent display area 102 is greater than that in the conventional display area 101, the current density of the light-emitting devices in the transparent display area 102 is relatively high, leading to faster aging of these devices. As the display panel is used for longer periods, the luminous efficiency of the light-emitting devices in the transparent display area 102 decreases faster than that in the conventional display area 101, resulting in differences in brightness and color between the transparent display area 102 and the conventional display area 101, thus reducing the display effect of the display panel.

[0054] To address the aforementioned technical problems, embodiments of the present invention provide a display panel. Figure 2 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of a first pixel circuit provided in an embodiment of the present invention. Figure 2 and Figure 3 As shown, the display panel includes a first display area 11 and a second display area 12. The second display area 12 at least partially surrounds the first display area 11. The light transmittance of the first display area 11 is greater than that of the second display area 12. The first display area 11 is provided with a first pixel circuit C1. The first pixel circuit C1 includes a first driving transistor DT1. The first driving transistor DT1 includes a first electrode, a second electrode, and a first gate G1. The first electrode of the first driving transistor DT1 is connected to the power signal line VDD, and the second electrode of the first driving transistor DT1 is connected to the light-emitting device D1. The first gate G1 is used to write the data voltage VDATA. The first driving transistor DT1 also includes a second gate G2. The second gate G2 is used to connect the adjustment voltage Vs.

[0055] Specifically, the display panel can be a full-screen display panel. The second display area 12 can be the regular display area of ​​the display panel, or the main screen of the display panel. The first display area 11 can be a transparent display area of ​​the display panel, or the secondary screen of the display panel. For example, the first display area 11 can be circular, teardrop-shaped, or U-shaped, etc. Figure 2 The first display area 11 is exemplarily shown to be rectangular. The display panel also includes pixel units P. Within the first display area 11, pixel unit P includes a first pixel circuit C1 and a first light-emitting device D1. The first pixel circuit C1 and the first light-emitting device D1 can be stacked in the thickness direction of the display panel. The anode of the first pixel circuit C1 and the first light-emitting device D1 are connected, so that the first pixel circuit C1 provides a driving current to the first light-emitting device D1, driving the first light-emitting device D1 to emit light. Similarly, within the second display area 12, pixel unit P may include a second pixel circuit C2 and a second light-emitting device D2. The second pixel circuit C2 and the second light-emitting device D2 can be stacked in the thickness direction of the display panel. The anode of the second pixel circuit C2 and the second light-emitting device D2 are connected, so that the second pixel circuit C2 provides a driving current to the second light-emitting device D2, driving the second light-emitting device D2 to emit light.

[0056] For example, such as Figure 3As shown, the first pixel circuit C1 also includes a first switching transistor T1. The gate of the first switching transistor T1 is connected to the scan signal S1, the first terminal of the first switching transistor T1 is connected to the data voltage VDATA, and the second terminal of the first switching transistor T1 is connected to the first gate G1 of the first driving transistor DT1. During the operation of the first pixel circuit C1, when the scan signal S1 controls the first switching transistor T1 to turn on, the first driving transistor DT1 in the first pixel circuit C1 generates a driving current according to the data voltage VDATA provided by the first switching transistor T1, and transmits it to the anode of the first light-emitting device D1, driving the first light-emitting device D1 to emit light. The storage capacitor Cst is used to store the potential of the first gate G1 of the first driving transistor DT1, and the cathode of the first light-emitting device D1 is connected to the voltage signal line VSS to provide a stable voltage for the first light-emitting device D1. In the display panel, the anode area of ​​the first light-emitting device D1 can be set smaller than the anode area of ​​the second light-emitting device D2, making the pixel aperture ratio of the first display area 11 smaller than that of the second display area 12, and making the light transmittance of the first display area 11 greater than that of the second display area 12. This allows a photosensitive element to be placed at a relative position in the first display area 11, achieving under-screen light sensing of the display panel and thus enabling full-screen display. For example, the photosensitive element can be a camera, enabling under-screen imaging of the display panel.

[0057] During the display process of the display panel, the first luminous brightness in the first display area 11 is different from the second luminous brightness in the second display area 12. For example, the driving current provided by the first pixel circuit C1 to the first light-emitting device D1 in the first display area 11 is greater than the driving current provided by the second pixel circuit C2 to the second light-emitting device D2 in the second display area 12, causing the efficiency decay rate of the first light-emitting device D1 in the first display area 11 to be greater than the efficiency decay rate of the second light-emitting device D2 in the second display area 12. When the cumulative light emission time of the first light-emitting device D1 in the first display area 11 is the same as the cumulative light emission time of the second light-emitting device D2 in the second display area 12, the luminous brightness of the first light-emitting device D1 in the first display area 11 is different from that of the second light-emitting device D2 in the second display area 12 at the same grayscale. After acquiring the first light-emitting data of the first display area 11 and the second light-emitting data of the second display area 12, the current driving current of the first light-emitting device D1 can be determined based on the first light-emitting data and the efficiency decay curve of the first light-emitting device D1. Then, the current driving current of the second light-emitting device D2 can be determined based on the second light-emitting data and the efficiency decay curve of the second light-emitting device D2. The current difference between the two devices is then determined based on their current currents. The voltage of the second gate G2 is adjusted according to this current difference, thereby adjusting the threshold voltage of the first driving transistor DT1 to regulate its driving current. This allows the first light-emitting device D1 to emit light according to the driving current of the first driving transistor DT1, compensating for the difference in light emission state between it and the second light-emitting device D2. This compensates for the brightness difference in the first display area 11, improves the display uniformity between the first and second display areas 11, and ultimately enhances the display effect of the display panel. The first light-emitting data characterizes the light emission state of the first display area 11, and the second light-emitting data characterizes the light emission state of the second display area 12. Additionally, the second pixel circuit C2 may include a second driving transistor. This second driving transistor generates a driving current based on the data voltage and transmits it to the second light-emitting device D2, driving D2 to emit light. In this case, the second driving transistor can be a conventional driving transistor, i.e., it only includes one gate, simplifying the design of the second pixel circuit C2.

[0058] For example, Figure 4 This invention provides a characteristic curve of a driving transistor, wherein the horizontal axis represents the gate-source voltage difference Vgs of the driving transistor, and the vertical axis represents the source-drain current I of the driving transistor. ds Curve 1 shows the characteristic curve of the driving transistor when the back gate is 0V, and curve 2 shows the characteristic curve of the driving transistor when the back gate is 4V. Figure 4It can be seen that when the back gate voltage increases, the driving transistor becomes forward biased, which increases the threshold voltage of the driving transistor. That is, the back gate voltage of the driving transistor affects the threshold voltage of the driving transistor. Figure 5 This invention provides a curve showing the relationship between the change in driving current and the change in the threshold voltage of the driving transistor. The horizontal axis represents the change in threshold voltage, and the vertical axis represents the change in driving current. Curve 3 shows the change in driving current when the threshold voltage is -2.5V, and curve 4 shows the change in driving current when the threshold voltage is -3.5V. Figure 5 It is known that changes in the threshold voltage of the driving transistor affect the driving current generated by the driving transistor. When the threshold voltage of the driving transistor increases, the driving current generated by the driving transistor decreases. When determining the difference in driving current between the first driving transistor DT1 and the second driving transistor, the difference in threshold voltage of the driving transistor can be determined based on the difference in driving current, and the difference in back gate voltage can be determined based on the difference in threshold voltage, which serves as the adjustment voltage Vs. Therefore, the back gate voltage of the first driving transistor DT1 can be adjusted based on the adjustment voltage Vs, thereby adjusting the threshold voltage of the first driving transistor DT1, further adjusting the driving current of the first driving transistor DT1. When the first light-emitting device D1 emits light according to the driving current of the first driving transistor DT1, it can compensate for the difference in the light emission state with the second light-emitting device D2, thereby compensating for the brightness of the first display area 11, improving the display uniformity of the first display area 11 and the second display area 12, and thus improving the display effect of the display panel.

[0059] in, Figure 3 The example illustrates that the first gate G1 and the second gate G2 of the first driving transistor DT1 are the top gate and the back gate, respectively. In other embodiments, the first gate G1 and the second gate G2 of the first driving transistor DT1 can be the gates of two sub-transistors connected in series. In this case, the first driving transistor DT1 can still perform the above process, and there is no limitation here.

[0060] It should be noted that, Figure 3 The structure of pixel circuit C1 is shown only as an example. In other embodiments, pixel circuit C1 may have other structures. Figure 6 This is a schematic diagram of another first pixel circuit provided in an embodiment of the present invention. Figure 2 and Figure 6 As shown, the first pixel circuit also includes a first transistor T2, which is connected between the first gate G1 and the second terminal of the first driving transistor DT1; the first transistor T2 includes a third gate G3 and a fourth gate G4, the third gate G3 is used to receive the scan signal S1, and the fourth gate G4 is used to receive the adjustment voltage Vs.

[0061] Specifically, Figure 6 An exemplary embodiment shows that the first transistor T2 is a P-type transistor. The first transistor T2 is connected between the first gate G1 and the second terminal of the first driving transistor DT1. When the first transistor T2 is turned on, the first driving transistor DT1 can be configured as a diode, allowing the threshold voltage of the first driving transistor DT1 to be written into its first gate G1, thus achieving threshold compensation. The first pixel circuit C1 also includes a first switching transistor T1. The first terminal of the first switching transistor T1 is connected to the data voltage VDATA, the second terminal of the first switching transistor T1 is connected to the first driving transistor DT1, and the gate of the first switching transistor T1 is connected to the scan signal S1. During the operation of the first pixel circuit C1, when the first pixel circuit is in the data writing stage, the scan signal S1 is low, controlling the first transistor T2 to turn on. Simultaneously, the scan signal S1 controls the first switching transistor T1 to turn on, allowing the data voltage VDATA to be written into the first gate G1 through the first switching transistor T1, the first driving transistor DT1, and the first transistor T2. The first transistor T2 has a threshold voltage; when the first transistor T2 is turned on, it can act as a capacitor to store charge. At the end of the data writing phase, the scan signal S1 transitions from low to high. The first transistor T2, acting as a capacitor with zero capacitance, receives charge that is written to the first gate G1 of the first driving transistor DT1, affecting its potential and consequently the driving current. The capacitance of the first transistor T2 in its on-state is related to its threshold voltage, which in turn is related to the voltage of the fourth gate G4. By adjusting the voltage Vs input to the fourth gate G4, the threshold voltage of the first transistor T2 can be adjusted, thereby regulating the amount of charge written to the first gate G1, i.e., adjusting the potential of the first gate G1. This, in turn, regulates the driving current of the first driving transistor DT1. When the first light-emitting device D1 emits light according to the driving current of the first driving transistor DT1, it compensates for the difference in light emission state between the first and second light-emitting devices D2, thus compensating for the brightness of the first display area 11. This improves the display uniformity between the first and second display areas 11, ultimately enhancing the display panel's overall performance.

[0062] Similarly, Figure 6 The example shows that the third gate G3 and the fourth gate G4 of the first transistor T2 are the top gate and the back gate, respectively. In other embodiments, the third gate G3 and the fourth gate G4 of the first transistor T2 can be the gates of two sub-transistors connected in series. In this case, the first transistor T2 can still perform the above process, and there is no limitation here.

[0063] Continue to refer to Figure 6 The first pixel circuit C1 also includes a second switching transistor T3, a third switching transistor T4, a fourth switching transistor T5, a fifth switching transistor T6, and a storage capacitor Cst. Figure 6The example shows that the second switching transistor T3 is a dual-gate P-type transistor, and the third switching transistor T4, the fourth switching transistor T5 and the fifth switching transistor T6 are all P-type transistors. The first terminal of the second switching transistor T3 is connected to the first initialization voltage signal line VREF1. The second terminal of the second switching transistor T3 is connected to the first gate G1 of the first driving transistor DT1. The gate of the second switching transistor T3 is connected to the first control signal line ctrl1. The first terminal of the third switching transistor T4 is connected to the second initialization voltage signal line VREF2. The second terminal of the third switching transistor T4 is connected to the anode of the first light-emitting device D1. The gate of the third switching transistor T4 is connected to the second control signal line ctrl2. The first terminal of the fourth switching transistor T5 is connected to the power supply signal line VDD. The second terminal of the fourth switching transistor T5 is connected to the first terminal of the first driving transistor DT1. The first terminal of the fifth switching transistor T6 is connected to the second terminal of the first driving transistor DT1. The second terminal of the fifth switching transistor T6 is connected to the anode of the first light-emitting device D1. The gates of the fourth switching transistor T5 and the fifth switching transistor T6 are connected to the light-emitting control signal line EM. The cathode of the first light-emitting device D1 is connected to the voltage signal line VSS. During the operation of the first pixel circuit C1, in the first initialization phase, the first control signal provided by the first control signal line ctrl1 is at a low level, controlling the second switching transistor T3 to conduct. The first initialization voltage signal provided by the first initialization voltage signal line VREF1 is transmitted to the first gate G1 of the first driving transistor DT1 through the second switching transistor T3, initializing the first driving transistor DT1. In the data writing phase, the scan signal S1 provides a low level, controlling the first switching transistor T1 and the first transistor T2 to conduct. The data voltage is written to the first gate G1 of the first driving transistor DT1 through the first switching transistor T1, the first driving transistor DT1, and the first transistor T2, realizing data writing and threshold compensation. In the second initialization phase, the second control signal provided by the second control signal line ctrl2 is at a low level, controlling the third switching transistor T4 to conduct. The second initialization voltage signal provided by the second initialization voltage signal line VREF2 is transmitted to the anode of the first light-emitting device D1 through the third switching transistor T4, initializing the first light-emitting device D1. During the light-emitting stage, the light-emitting control signal provided by the light-emitting control signal line EM is at a low level, which controls the fourth switching transistor T5 and the fifth switching transistor T6 to turn on. The power signal provided by the power signal line VDD is transmitted to the first terminal of the first driving transistor DT1 through the fourth switching transistor T5, so that the first driving transistor DT1 turns on. At the same time, a driving current is formed according to the first terminal potential and the first gate G1 potential, and is transmitted to the first light-emitting device D1 through the fifth switching transistor T5, driving the first light-emitting device D1 to emit light.

[0064] in addition, Figure 3and Figure 6 The second gate G2 of the first driving transistor DT1 or the fourth gate G4 of the first transistor T2 is shown as an example only for input regulating voltage Vs. Figure 7 This is a schematic diagram of another first pixel circuit provided in an embodiment of the present invention. Figure 7 As shown, in other embodiments, when the first pixel circuit C1 includes the first transistor T2, the second gate G2 and the fourth gate G4 can also be simultaneously set to input adjustment voltage Vs. At this time, the threshold voltage of the first driving transistor DT1 and the threshold voltage of the first transistor T2 can be adjusted simultaneously to adjust the driving current formed by the first driving transistor DT1. When the first light-emitting device D1 emits light according to the driving current of the first driving transistor DT1, it can compensate for the difference in the light emission state with the second light-emitting device D2, thereby compensating for the brightness of the first display area 11, improving the display uniformity of the first display area 11 and the second display area 12, and thus improving the display effect of the display panel.

[0065] It should be noted that, in this embodiment, the first pixel circuit C1 and the second pixel circuit C2 are shown to have the same structure, that is, the first pixel circuit C1 and the second pixel circuit C2 have the same number of transistors and capacitors, and the connection method between the transistors and capacitors can be the same. In other embodiments, the structures of the first pixel circuit C1 and the second pixel circuit C2 may be different, which is not limited here.

[0066] The technical solution of this embodiment, by setting the first driving transistor to include a second gate, and connecting the second gate to an adjustment voltage Vs, can adjust the threshold voltage of the first driving transistor to adjust the driving current of the first driving transistor; and / or, by setting the second gate of the first transistor to be connected to the adjustment voltage Vs, the threshold voltage of the first transistor can be adjusted, thereby adjusting the amount of charge written by the first transistor to the first gate, that is, adjusting the potential of the first gate, and thus adjusting the driving current of the first driving transistor; so that when the first light-emitting device in the first display area emits light according to the driving current of the first driving transistor, it can compensate for the difference in the light emission state with the second light-emitting device in the second display area, thereby compensating for the brightness of the first display area, improving the display uniformity of the first display area and the second display area, and thus improving the display effect of the display panel.

[0067] Figure 8 This is a schematic diagram of another display panel structure provided in an embodiment of the present invention. Figure 9 This is a partial structural diagram of a display panel provided in an embodiment of the present invention, such as... Figure 8 and Figure 9As shown, the display panel also includes a non-display area 13, which is provided with a driver chip 131. The driver chip 131 is used to determine the adjustment voltage Vs based on the first light emission data of the first display area 11 and the second light emission data of the second display area 12. The first display area 11 is provided with a plurality of first pixel circuits C1, and each second gate G2 and / or fourth gate G4 is connected to the driver chip 131 through a conductive line L1.

[0068] Specifically, the driver chip 131 can acquire first light-emitting data of the first display area 11 and second light-emitting data of the second display area 12. Then, the driver chip 131 determines the current driving current of the first light-emitting device D1 based on the first light-emitting data and the efficiency decay curve of the first light-emitting device D1. It then determines the current driving current of the second light-emitting device D2 based on the second light-emitting data and the efficiency decay curve of the second light-emitting device D2. Finally, it determines the current difference between the two based on the current difference. Finally, it determines the threshold voltage difference between the first driving transistor and the second driving transistor based on the current difference, and determines the gate voltage difference between the second gate of the first driving transistor and the gate of the second driving transistor based on the threshold voltage difference, which serves as the adjustment voltage Vs. When the first display area 11 has multiple first pixel circuits C1, and each first pixel circuit C1 includes a first driving transistor DT1, the second gate G2 in each first pixel circuit C1 can be connected to different output ports of the driving chip 131 through a conductive line L1. This allows the driving chip 131 to control the voltage of each second gate G2 individually, thereby adjusting the light emission state of each first light-emitting device D1. This helps to compensate for the difference in light emission states between each first light-emitting device D1 and the second light-emitting device D2, thereby further improving the brightness compensation accuracy of the first display area 11, improving the display uniformity between the first display area 11 and the second display area 12, and thus improving the display effect of the display panel. Alternatively, when the first display area 11 has multiple first pixel circuits C1, and each first pixel circuit C1 includes a first driving transistor DT1 and a first transistor T2, the fourth gate G4 in each first pixel circuit C1 can be connected to different output ports of the driving chip 131 through a conductive line L1. This allows the driving chip 131 to control the voltage of each fourth gate G4 individually, thereby adjusting the light emission state of each first light-emitting device D1. This helps to compensate for the difference in light emission state between each first light-emitting device D1 and the second light-emitting device D2, thereby further improving the brightness compensation accuracy of the first display area 11, improving the display uniformity between the first display area 11 and the second display area 12, and thus improving the display effect of the display panel.Alternatively, when the first display area 11 has multiple first pixel circuits C1, and each first pixel circuit C1 includes a first driving transistor DT1 and a first transistor T2, the second gate G2 and the fourth gate G4 in each first pixel circuit C1 can be connected to different output ports of the driving chip 131 through a conductive line L1, so that the driving chip 131 can control the voltage of each second gate G2 and the fourth gate G4 individually, thereby adjusting the light emission state of each first light-emitting device D1. This is beneficial for compensating the difference in light emission state between each first light-emitting device D1 and the second light-emitting device D2, thereby further improving the brightness compensation accuracy of the first display area 11, improving the display uniformity between the first display area 11 and the second display area 12, and thus improving the display effect of the display panel.

[0069] Figure 10 This is a partial structural diagram of another display panel provided in an embodiment of the present invention, as shown below. Figure 10 As shown, the display panel also includes a first voltage signal line V1; the second display area 12 is provided with a second pixel circuit C2, the second pixel circuit C2 includes a second driving transistor, the second driving transistor includes a first terminal, a second terminal and a fifth gate; the first terminal of the second driving transistor is connected to the power signal line, the second terminal of the second driving transistor is connected to the second light-emitting device; the fifth gate is used to write the data voltage;

[0070] The second driving transistor also includes a sixth gate, which is connected to the first voltage signal line V1.

[0071] Specifically, the first voltage signal line V1 can provide a constant voltage. For example, the power signal line is multiplexed as the first voltage signal line. That is, the first voltage signal line V1 can be a power signal line used to provide power within the display panel. Similarly, within the second display area 12, a second driving transistor including a fifth gate and a sixth gate can be configured, such that the structure of the second driving transistor is the same as that of the first driving transistor. This allows the first and second driving transistors to be formed simultaneously in the same process, simplifying the display panel manufacturing process. Furthermore, by connecting the sixth gate to the first voltage signal line V1, the voltage of the sixth gate can be kept constant, thereby maintaining a constant threshold voltage for the second driving transistor. When the second driving transistor generates a driving current based on the data voltage, the influence of the threshold voltage on the driving current can be reduced, ensuring the stability of the driving current.

[0072] Furthermore, the second pixel circuit C2 may also include a switching transistor and a storage capacitor. Their specific number and connection relationship can be consistent with the first pixel circuit C1, thereby further ensuring the structural consistency of the first pixel circuit C1 and the second pixel circuit C2. This allows the first pixel circuit C1 and the second pixel circuit C2 to be formed synchronously using the same process, which helps simplify the manufacturing process of the display panel. For example, when the second pixel circuit C2 includes a second driving transistor, a first switching transistor, and a storage capacitor, its specific connection structure can be referenced... Figure 3 This will not be elaborated upon here.

[0073] It should be noted that in other embodiments, the first voltage signal line V1 can also be a reference voltage signal line in the display panel used to provide a reference voltage, which can also provide a stable voltage signal for the sixth gate, keeping the threshold voltage of the second driving transistor unchanged.

[0074] Alternatively, in other embodiments, the display panel further includes a second voltage signal line; the second pixel circuit further includes a second transistor connected between the fifth gate and the second electrode of the second driving transistor; the second transistor includes a seventh gate and an eighth gate, the seventh gate being used to write a scan signal, and the eighth gate being connected to the second voltage signal line.

[0075] Specifically, when the first pixel circuit includes a first transistor, the second pixel circuit may include a second transistor connected between the fifth gate and the second terminal of the second driving transistor. When the second transistor is turned on, the second driving transistor can be configured as a diode, allowing the threshold voltage of the second driving transistor to be written into the fifth gate, thus achieving threshold compensation. By configuring the second pixel circuit to include a second transistor, and the second transistor simultaneously including a seventh gate and an eighth gate, the transistor structure in the second pixel circuit can be identical to that in the first pixel circuit. This allows the first and second transistors to be formed simultaneously in the same process, simplifying the display panel manufacturing process. Furthermore, by connecting the eighth gate to the second voltage signal line, the voltage of the eighth gate can be kept constant, thereby maintaining the threshold voltage of the second transistor. When the second driving transistor generates a driving current based on the data voltage, the influence of the threshold voltage of the second transistor on the driving current can be reduced, ensuring the stability of the driving current.

[0076] Similarly, when the first pixel circuit includes a first transistor, it may also include a second switching transistor, a third switching transistor, a fourth switching transistor, a fifth switching transistor, and a storage capacitor. For specific connection details, please refer to [reference needed]. Figure 6 and Figure 7In this case, the second pixel circuit, in addition to including the second transistor, can also include a second switching transistor, a third switching transistor, a fourth switching transistor, a fifth switching transistor, and a storage capacitor. Its specific connection relationship can be consistent with that of the first pixel circuit, thereby further ensuring the structural consistency of the first and second pixel circuits. This allows the first and second pixel circuits to be formed synchronously using the same process, which helps simplify the manufacturing process of the display panel.

[0077] It should be noted that the second voltage signal line can be a separate constant voltage signal line in the display panel, or it can reuse the power signal line and reference voltage signal line in the display panel; there are no limitations here.

[0078] This invention also provides a brightness compensation method for a display panel, used to compensate for the brightness of the display panel provided in any embodiment of this invention. This method can be executed by a brightness compensation device for the display panel, which can be integrated into a display device or electronic device. Figure 11 A flowchart of a brightness compensation method for a display panel provided in an embodiment of the present invention is shown below. Figure 2 , Figure 3 and Figure 11 As shown, the method specifically includes the following steps:

[0079] S110: Obtain first light emission data of the first display area and second light emission data of the second display area;

[0080] The display panel can be a full-screen display panel. The second display area 12 can be the regular display area of ​​the display panel, or the main screen of the display panel. The first display area 11 can be a transparent display area of ​​the display panel, or the secondary screen of the display panel. For example, the first display area 11 can be circular, teardrop-shaped, or U-shaped, etc. Figure 2The diagram exemplarily illustrates a first display area 11 that is rectangular. A first pixel circuit C1 and a first light-emitting device D1 are disposed within the first display area 11, and a second pixel circuit C2 and a second light-emitting device D2 are disposed within the second display area 12. The first pixel circuit C1 includes a first driving transistor DT1, which includes a first gate G1 and a second gate G2. The second pixel circuit C2 includes a second driving transistor, which includes a third gate and a fourth gate. Within the display panel, the anode area of ​​the first light-emitting device D1 can be set smaller than the anode area of ​​the second light-emitting device D2, making the pixel aperture ratio of the first display area 11 smaller than that of the second display area 12. This results in the light transmittance of the first display area 11 being greater than that of the second display area 12. This allows a photosensitive element to be disposed at a relative position within the first display area 11, enabling under-display photosensitive technology and thus achieving full-screen display. For example, the photosensitive element can be a camera, enabling under-display imaging of the display panel.

[0081] During the display process of the display panel, the first luminous brightness in the first display area 11 is different from the second luminous brightness in the second display area 12. For example, the driving current provided by the first pixel circuit C1 to the first light-emitting device D1 is greater than the driving current provided by the second pixel circuit C2 to the second light-emitting device D2, resulting in a greater efficiency decay rate for the first light-emitting device D1 than for the second light-emitting device D2. When the cumulative luminous time of the first light-emitting device D1 is the same as the cumulative luminous time of the second light-emitting device D2, the luminous brightness of the first light-emitting device D1 is different from that of the second light-emitting device D2 at the same grayscale. At this time, the first luminous data of the first display area 11 and the second luminous data of the second display area 12 can be obtained respectively. The first luminous data is used to characterize the luminous state of the first display area 11, and the second luminous data is used to characterize the luminous state of the second display area 12.

[0082] S120. Determine the adjustment voltage of the first display area based on the first light emission data and the second light emission data;

[0083] In the pixel circuit, the driving transistor is used to generate a driving current based on the data voltage. When the driving transistor generates the driving current, the driving current is related to the threshold voltage of the driving transistor. When the back gate voltage of the driving transistor changes, it can cause a change in the threshold voltage of the driving transistor, thereby affecting the driving current generated by the driving transistor.

[0084] After acquiring the first and second emission data, the emission states of the first emission device D1 and the second emission device D2 can be determined based on the first and second emission data, respectively. Then, based on the efficiency decay curves of the first and second emission devices D1 and D2, and the difference in emission states between the emission devices in the first and second display areas 11 and 12, the difference in driving current between the first and second emission devices D1 and D2 is determined. The driving current is related to the threshold voltage of the driving transistor, and the threshold voltage of the driving transistor is related to the back gate voltage of the driving transistor. Therefore, the voltage difference between the second gate G2 of the first driving transistor DT1 and the fourth gate of the second driving transistor can be determined based on the driving current difference, and used as the adjustment voltage Vs of the first display area 11.

[0085] S130. Adjust the second gate voltage of the first driving transistor in the first display area according to the adjustment voltage to compensate for the brightness of the first display area.

[0086] Specifically, after determining the adjustment voltage Vs of the first display area 11, the voltage of the second gate G2 is adjusted according to the adjustment voltage Vs, thereby adjusting the threshold voltage of the first driving transistor DT1, and thus adjusting the driving current generated by the first driving transistor DT1. When the driving current provided by the first driving transistor DT1 drives the first light-emitting device D1 to emit light, it can compensate for the difference in the light emission state between the first light-emitting device D1 and the second light-emitting device D2, thereby compensating for the brightness of the first display area 11, improving the display uniformity between the first display area 11 and the second display area 12, and thus improving the display effect of the display panel.

[0087] The technical solution of this embodiment obtains first light-emitting data of the first display area and second light-emitting data of the second display area, and then determines the adjustment voltage of the first display area based on the first light-emitting data and the second light-emitting data. This voltage is used to adjust the voltage of the second gate, thereby adjusting the threshold voltage of the first driving transistor and thus adjusting the driving current of the first driving transistor. When the driving current provided by the first driving transistor drives the first light-emitting device to emit light, it can compensate for the difference in the light-emitting state between the first light-emitting device and the second light-emitting device, thereby compensating for the brightness of the first display area, improving the display uniformity between the first display area and the second display area, and thus improving the display effect of the display panel.

[0088] When the first pixel circuit further includes a first transistor, the first transistor being connected between the first gate and the second terminal of the first driving transistor; the first transistor includes a third gate and a fourth gate, the third gate being used to write a scan signal, and the fourth gate being used to connect an adjustment voltage. Figure 12A flowchart of another brightness compensation method for a display panel provided in an embodiment of the present invention is shown below. Figure 2 , Figure 6 and Figure 12 As shown, the method specifically includes the following steps:

[0089] S210: Obtain first light emission data of the first display area and second light emission data of the second display area;

[0090] S220. Determine the adjustment voltage of the first display area based on the first light emission data and the second light emission data;

[0091] When the first pixel circuit includes a first transistor, when the first driving transistor generates a driving current, the threshold voltage of the first driving transistor can be compensated by the first transistor T2. The threshold voltage of the first driving transistor can generally be 70%-80%, so that the driving current is still related to the threshold voltage of the first driving transistor.

[0092] S230. Adjust the fourth gate voltage of the first transistor in the first display area according to the adjustment voltage to compensate for the brightness of the first display area.

[0093] In this configuration, the capacitance of the first transistor T2 in its on-state is related to its threshold voltage, which in turn is related to the voltage of the fourth gate G4. By adjusting the voltage Vs input to the fourth gate G4, the threshold voltage of the first transistor T2 can be adjusted, thereby adjusting the amount of charge written by the first transistor T2 to the first gate G1, i.e., adjusting the potential of the first gate G1. This, in turn, adjusts the driving current of the first driving transistor DT1, so that when the first light-emitting device D1 emits light according to the driving current of the first driving transistor DT1, it can compensate for the difference in the light-emitting state between it and the second light-emitting device D2. This can compensate for the brightness of the first display area 11, improve the display uniformity between the first display area 11 and the second display area 12, and thus improve the display effect of the display panel. The technical solution of this embodiment obtains first light-emitting data of the first display area and second light-emitting data of the second display area, and then determines the adjustment voltage of the first display area based on the first light-emitting data and the second light-emitting data. This voltage is used to adjust the voltage of the fourth gate, which can adjust the threshold voltage of the first transistor, thereby adjusting the amount of charge written by the first transistor to the first gate, i.e., adjusting the potential of the first gate, and further adjusting the driving current of the first driving transistor. When the driving current provided by the first driving transistor drives the first light-emitting device to emit light, it can compensate for the difference in the light-emitting state between the first light-emitting device and the second light-emitting device, thereby compensating for the brightness of the first display area, improving the display uniformity between the first display area and the second display area, and thus improving the display effect of the display panel.

[0094] When the first pixel circuit further includes a first transistor, the first transistor being connected between the first gate and the second terminal of the first driving transistor; the first transistor includes a third gate and a fourth gate, the third gate being used to write a scan signal, and the fourth gate being used to connect an adjustment voltage. Figure 13 A flowchart of another brightness compensation method for a display panel provided in an embodiment of the present invention is shown below. Figure 2 , Figure 7 and Figure 13 As shown, the method specifically includes the following steps:

[0095] S310: Obtain first light emission data of the first display area and second light emission data of the second display area;

[0096] S320. Determine the adjustment voltage of the first display area based on the first light emission data and the second light emission data;

[0097] S330. Adjust the second gate voltage of the first driving transistor in the first display area according to the adjustment voltage, and adjust the fourth gate voltage of the first transistor in the first display area to compensate for the brightness of the first display area.

[0098] The technical solution of this embodiment acquires first light-emitting data of the first display area and second light-emitting data of the second display area, and then determines an adjustment voltage of the first display area based on the first and second light-emitting data. This voltage is used to adjust the voltage of the second gate, thereby adjusting the threshold voltage of the first driving transistor and thus the driving current of the first driving transistor. Furthermore, adjusting the voltage of the fourth gate based on the adjustment voltage adjusts the threshold voltage of the first transistor, thereby adjusting the amount of charge written by the first transistor to the first gate, i.e., adjusting the potential of the first gate, and thus adjusting the driving current of the first driving transistor. This allows the driving current provided by the first driving transistor to drive the first light-emitting device to emit light, compensating for the difference in the light-emitting state between the first and second light-emitting devices, thereby compensating for the brightness of the first display area, improving the display uniformity between the first and second display areas, and ultimately improving the display effect of the display panel.

[0099] Based on the above technical solution, the brightness compensation method for the display panel can be further optimized. The first emission data includes first brightness data, and the second emission data includes second brightness data. Figure 14 A flowchart of another brightness compensation method for a display panel provided in an embodiment of the present invention is shown below. Figure 14 As shown, the method includes:

[0100] S410: Obtain first light emission data of the first display area and second light emission data of the second display area;

[0101] The first light emission data may include brightness data of the first display area, and is used as the first brightness data. The second light emission data may include brightness data of the second display area, and is used as the second brightness data. The first brightness data can characterize the luminous brightness of the light-emitting device in the first display area, i.e., the luminous brightness of the first light-emitting device; the second brightness data can characterize the luminous brightness of the light-emitting device in the second display area, i.e., the luminous brightness of the second light-emitting device.

[0102] When acquiring first and second brightness data, the test element group (TEG) can be used. For example, when acquiring the first brightness data, the TEG can be configured to have the same structure as the first display area of ​​the display panel, such as the same pixel unit arrangement and pixel aperture ratio. Then, the TEG is driven using the driving current corresponding to the first display area to acquire the first brightness data. Similarly, when acquiring the second brightness data, the TEG can be configured to have the same structure as the second display area of ​​the display panel. Then, the TEG is driven using the driving current corresponding to the second display area to acquire the second brightness data.

[0103] S420. Determine the current of the first driving transistor in the first display area based on the first brightness data and the first efficiency decay curve; wherein, the first efficiency decay curve is the efficiency decay curve of the first light-emitting unit in the first display area.

[0104] The light-emitting unit can be a light-emitting device, such as an OLED. The first efficiency decay curve characterizes the relationship between the driving current and brightness of the first light-emitting unit in the first display area under a certain cumulative light-emitting time. When different first light-emitting units in the first display area have the same brightness at the initial light-emitting time, and the cumulative light-emitting time is constant, the larger the driving current, the greater the efficiency decay of the first light-emitting unit in the first display area, and the lower the brightness of the first light-emitting unit. Conversely, when different first light-emitting units in the first display area have the same brightness at the initial light-emitting time, and the driving current is constant, the longer the cumulative light-emitting time, the greater the efficiency decay of the first light-emitting unit in the first display area, and the lower the brightness of the first light-emitting unit.

[0105] The first efficiency decay curve can be pre-stored in the driving unit of the display panel. Multiple first efficiency decay curves may be included, each with a different cumulative emission time. After determining the first brightness data, the current of the first driving transistor within the first display area can be determined based on the first brightness data and the first efficiency decay curves.

[0106] S430. Determine the current of the second driving transistor in the second display area based on the second brightness data and the second efficiency decay curve; wherein, the second efficiency decay curve is the efficiency decay curve of the second light-emitting unit in the second display area;

[0107] The second efficiency decay curve characterizes the relationship between the driving current and brightness of the second light-emitting unit within the second display area under a certain cumulative emission time. When different second light-emitting units within the second display area have the same brightness at the initial emission time, and the cumulative emission time is constant, a larger driving current results in a greater degree of efficiency decay of the second light-emitting unit within the second display area, and a lower brightness of the second light-emitting unit. Conversely, when different second light-emitting units within the second display area have the same brightness at the initial emission time, and the driving current is constant, a longer cumulative emission time results in a greater degree of efficiency decay of the second light-emitting unit within the second display area, and a lower brightness of the second light-emitting unit.

[0108] The second efficiency decay curve can be pre-stored in the driving unit of the display panel. Multiple second efficiency decay curves may be included, each with a different cumulative emission time. After determining the second brightness data, the current of the second driving transistor within the second display area can be determined based on the second brightness data and the second efficiency decay curves.

[0109] S440. Determine the adjustment voltage of the first display area based on the difference between the current current of the first driving transistor in the first display area and the current current of the second driving transistor in the second display area;

[0110] Specifically, after determining the current current of the first driving transistor in the first display area and the current current of the second driving transistor in the second display area, the difference between the current currents of the first and second driving transistors in the first and second display areas can be calculated to determine the current difference. Then, based on the current difference, the difference between the threshold voltage of the first driving transistor in the first display area and the threshold voltage of the second driving transistor in the second display area is determined. Finally, the adjustment voltage of the first display area is determined based on the difference between the threshold voltages of the first and second driving transistors in the first and second display areas.

[0111] S450. Adjust the second gate voltage of the first driving transistor in the first display area according to the adjustment voltage to compensate for the brightness of the first display area; and / or,

[0112] Adjusting the fourth gate voltage of the first transistor within the first display area according to the adjustment voltage to compensate for the brightness of the first display area.

[0113] Based on the above technical solution, before determining the adjustment voltage of the first display area according to the first light emission data and the second light emission data, the method further includes:

[0114] Obtain the first cumulative light-emitting time of the first light-emitting unit in the first display area and the second cumulative light-emitting time of the second light-emitting unit in the second display area;

[0115] During the operation of the display panel, the cumulative light-emitting time of the light-emitting devices in the first display area and the cumulative light-emitting time of the light-emitting devices in the second display area can be recorded. For example, a driver chip can be used to record the cumulative light-emitting time of the light-emitting devices. The driver chip can be a driver chip for the display panel or a driver chip for a display device, which includes the display panel. For example, the display device can be a mobile phone or a computer, etc.

[0116] The first efficiency decay curve is determined based on the first cumulative luminescence time.

[0117] The first efficiency decay curve differs under different cumulative emission times. After determining the first cumulative emission time, the first efficiency decay curve can be determined based on the first cumulative emission time, so that the cumulative emission time of the first efficiency decay curve matches the first cumulative emission time.

[0118] The second efficiency decay curve is determined based on the second cumulative luminescence time.

[0119] The second efficiency decay curve differs under different cumulative emission times. After determining the second cumulative emission time, the second efficiency decay curve can be determined based on the second cumulative emission time, so that the cumulative emission time of the second efficiency decay curve matches the second cumulative emission time.

[0120] Based on the above technical solutions, before acquiring the first brightness data of the first display area and the second brightness data of the second display area respectively, the method further includes:

[0121] Obtain the brightness compensation trigger command from the display panel.

[0122] The display panel can be integrated into the display device. During the operation of the display device, a brightness compensation trigger command can be used to trigger the brightness compensation process of the display panel, thereby improving the user experience of the display device. For example, the brightness compensation trigger command can be a charging state activation command for the display device, enabling brightness compensation of the display panel while the display device is charging. Alternatively, the brightness compensation trigger command can also be a standby state trigger command for the display device, enabling brightness compensation of the display panel while the display device is in standby mode. This reduces the impact of the brightness compensation process on the use of the display device, thus improving its overall performance.

[0123] Based on the above technical solution, the brightness compensation method for the display panel can be further optimized. The display panel includes pixel units, and each pixel unit includes light-emitting units with at least two light-emitting colors; the first light-emitting data includes first chromaticity data, and the second light-emitting data includes second chromaticity data; Figure 15 A flowchart of another brightness compensation method for a display panel provided in an embodiment of the present invention is shown below. Figure 15 As shown, the method includes:

[0124] S510: Obtain first light emission data of the first display area and second light emission data of the second display area;

[0125] When a pixel unit includes light-emitting units of at least two colors, the efficiency of the light-emitting units of different colors decreases at different rates during the light-emitting process, resulting in color deviation in the display panel during the light-emitting process. For example, a pixel unit may include a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit; during the light-emitting process of the display panel, the efficiency of the red light-emitting unit, the green light-emitting unit, and the blue light-emitting unit decreases at different rates, resulting in color deviation in the display panel during the light-emitting process.

[0126] The first emission data may include chromaticity data of the first display area and is used as the first chromaticity data to characterize the current chromaticity of the first display area. The second emission data may include chromaticity data of the second display area and is used as the second chromaticity data to characterize the current chromaticity of the second display area. During the display process of the display panel, the driving current of the first display area is greater than that of the second display area, causing the efficiency decay rate of different color emission units in the first display area to differ from the efficiency decay rate of the corresponding color emission units in the second display area, resulting in a difference between the first chromaticity data and the second chromaticity data.

[0127] S520. Determine the luminous brightness of the light-emitting units of different luminous colors in the first display area and the second display area based on the first chromaticity data and the second chromaticity data;

[0128] In this context, the maximum grayscale brightness of the display panel is a known condition during its operation. After acquiring the first chromaticity data and the second chromaticity data, the luminance of the light-emitting devices of different luminous colors corresponding to the first chromaticity data can be calculated based on the first chromaticity data and the maximum grayscale brightness. For example, when the light-emitting units in the first display area include a first red light-emitting unit, a first green light-emitting unit, and a first blue light-emitting unit, the luminance of the first red light-emitting unit, the luminance of the first green light-emitting unit, and the luminance of the first blue light-emitting unit can be calculated based on the first chromaticity data and the maximum grayscale brightness. Simultaneously, the luminance of the light-emitting devices of different luminous colors corresponding to the second chromaticity data can be calculated based on the second chromaticity data and the maximum grayscale brightness. For example, when the light-emitting units in the second display area include a second red light-emitting unit, a second green light-emitting unit, and a second blue light-emitting unit, the luminance of the second red light-emitting unit, the luminance of the second green light-emitting unit, and the luminance of the second blue light-emitting unit can be calculated based on the second chromaticity data and the maximum grayscale brightness.

[0129] S530. Determine the current difference of the driving transistors in the first display area and the second display area based on the luminous brightness and the efficiency decay curve of the luminous units with different luminous colors.

[0130] The efficiency decay curves of the light-emitting units of different colors can include the efficiency decay curves of the light-emitting units of different colors corresponding to the first display area and the efficiency decay curves of the light-emitting units of different colors corresponding to the second display area. For example, when the light-emitting units in the first display area include a first red light-emitting unit, a first green light-emitting unit, and a first blue light-emitting unit, the efficiency decay curves of the light-emitting units of different colors corresponding to the first display area include the efficiency decay curves of the first red light-emitting unit, the first green light-emitting unit, and the first blue light-emitting unit; when the light-emitting units in the second display area include a second red light-emitting unit, a second green light-emitting unit, and a second blue light-emitting unit, the efficiency decay curves of the light-emitting units of different colors corresponding to the second display area include the efficiency decay curves of the second red light-emitting unit, the second green light-emitting unit, and the second blue light-emitting unit.

[0131] The efficiency decay curves of the light-emitting units of different colors corresponding to the first display area are used to characterize the relationship between the driving current and brightness of the light-emitting units of different colors in the first display area under a certain cumulative light-emitting time. The efficiency decay curves of the light-emitting units of different colors corresponding to the second display area are used to characterize the relationship between the driving current and brightness of the light-emitting units of different colors in the second display area under a certain cumulative light-emitting time. When the brightness of the light-emitting units of different colors is the same at the initial light-emitting time, and the cumulative light-emitting time is constant, the larger the driving current, the greater the efficiency decay of the light-emitting units of different colors, and the lower the brightness of the light-emitting units. When the brightness of the light-emitting units of different colors is the same at the initial light-emitting time, and the driving current is constant, the longer the cumulative light-emitting time, the greater the efficiency decay of the light-emitting units of different colors, and the lower the brightness of the light-emitting units. The efficiency decay curves of the light-emitting units of different colors can be different. The efficiency decay curves of the light-emitting units of different colors corresponding to the first display area and the second display area can be pre-stored in the driving unit of the display panel.

[0132] After obtaining the luminance of light-emitting units of different luminous colors, the current current of the driving transistor corresponding to each light-emitting unit of different luminous colors can be calculated based on the luminance of the light-emitting units of different luminous colors and the efficiency decay curves of the corresponding light-emitting devices. For example, when the light-emitting units in the first display area include a first red light-emitting unit, a first green light-emitting unit, and a first blue light-emitting unit, the luminance of the first display area includes the luminance of the first red light-emitting unit, the luminance of the first green light-emitting unit, and the luminance of the first blue light-emitting unit. Then, efficiency decay curves for the first red light-emitting unit, the first green light-emitting unit, and the first blue light-emitting unit are correspondingly set in the first display area. At this time, the driving current of the driving transistor corresponding to the first red light-emitting unit in the first display area can be calculated based on the luminance of the first red light-emitting unit and its efficiency decay curve; the driving current of the driving transistor corresponding to the first green light-emitting unit in the first display area can be calculated based on the luminance of the first green light-emitting unit and its efficiency decay curve; and the driving current of the driving transistor corresponding to the first blue light-emitting unit in the first display area can be calculated based on the luminance of the first blue light-emitting unit and its efficiency decay curve. Similarly, when the light-emitting units in the second display area include a second red light-emitting unit, a second green light-emitting unit, and a second blue light-emitting unit, then the second display area is correspondingly provided with efficiency decay curves for the second red light-emitting unit, the second green light-emitting unit, and the second blue light-emitting unit. At this time, the driving current of the driving transistor corresponding to the second red light-emitting unit in the second display area can be calculated based on the luminance of the second red light-emitting unit and its efficiency decay curve; the driving current of the driving transistor corresponding to the second green light-emitting unit in the second display area can be calculated based on the luminance of the second green light-emitting unit and its efficiency decay curve; and the driving current of the driving transistor corresponding to the second blue light-emitting unit in the second display area can be calculated based on the luminance of the second blue light-emitting unit and its efficiency decay curve. Then, the current difference is calculated based on the driving currents of the driving transistors corresponding to the light-emitting units of the same luminous color in the first and second display areas. For example, according to the above example, the current difference of the driving transistors corresponding to the red light-emitting units in the first and second display areas, the current difference of the driving transistors corresponding to the green light-emitting units in the first and second display areas, and the current difference of the driving transistors corresponding to the blue light-emitting units in the first and second display areas can be calculated respectively.

[0133] S540. Determine the adjustment voltage of the first display area based on the current difference.

[0134] Specifically, after determining the current difference of the driving transistors corresponding to different emitting colors in the first and second display areas, the difference in threshold voltage of the driving transistors corresponding to different emitting colors in the first and second display areas can be determined based on the current difference. Finally, the adjustment voltage corresponding to different emitting colors in the first display area can be determined based on the difference in threshold voltage of the driving transistors corresponding to different emitting colors in the first and second display areas. For example, when the current difference of the driving transistors corresponding to different emitting colors in the first and second display areas includes the current difference of the driving transistors corresponding to red emitting units, green emitting units, and blue emitting units, the difference in threshold voltage of the driving transistors corresponding to red emitting units in the first and second display areas can be determined based on the current difference of the driving transistors corresponding to red emitting units in the first and second display areas. Then, the adjustment voltage corresponding to the red emitting unit in the first display area can be determined based on the difference in threshold voltage of the driving transistors corresponding to red emitting units in the first and second display areas. Similarly, the difference in threshold voltage between the driving transistors corresponding to the green light-emitting units in the first and second display areas can be determined based on the current difference between the driving transistors corresponding to the green light-emitting units in the first and second display areas. Then, the adjustment voltage corresponding to the green light-emitting unit in the first display area can be determined based on the difference in threshold voltage between the driving transistors corresponding to the green light-emitting units in the first and second display areas. Likewise, the difference in threshold voltage between the driving transistors corresponding to the blue light-emitting units in the first and second display areas can be determined based on the current difference between the driving transistors corresponding to the blue light-emitting units in the first and second display areas. Then, the adjustment voltage corresponding to the blue light-emitting unit in the first display area can be determined based on the difference in threshold voltage between the driving transistors corresponding to the blue light-emitting units in the first and second display areas.

[0135] S550, Adjust the second gate voltage of the first driving transistor in the first display area according to the adjustment voltage to compensate for the brightness of the first display area; and / or,

[0136] Adjusting the fourth gate voltage of the first transistor within the first display area according to the adjustment voltage to compensate for the brightness of the first display area.

[0137] Specifically, by adjusting the second gate voltage of the driving transistor corresponding to the light-emitting unit of different colors according to the adjustment voltage corresponding to the light-emitting unit of different colors, the threshold voltage of the driving transistor corresponding to the light-emitting unit of different colors can be adjusted, thereby adjusting the driving current formed by the driving transistor corresponding to the light-emitting unit of different colors. And / or, by adjusting the fourth gate voltage of the first transistor corresponding to the light-emitting unit of different colors according to the adjustment voltage, the first gate voltage of the driving transistor corresponding to the light-emitting unit of different colors can be adjusted, thereby adjusting the driving current of the driving transistor corresponding to the light-emitting unit of different colors. When the light-emitting units of different colors in the first display area are emitting light, the difference in the emitting state of the light-emitting units of different colors in the first display area and the second display area can be compensated. This allows the brightness compensation of the display panel to be accurate down to the pixel unit emitting state compensation, improving the accuracy of brightness compensation. Furthermore, it improves the display uniformity between the first and second display areas, thereby improving the display effect of the display panel.

[0138] Based on the above technical solutions, the first display area includes at least two sub-regions, each sub-region including at least one pixel circuit; the adjustment voltages corresponding to different sub-regions are different.

[0139] Specifically, in the brightness compensation process of the display panel, the first display area can be divided into at least two sub-regions. Each sub-region includes at least one pixel circuit, and each pixel circuit can be correspondingly configured with a light-emitting unit, so that each light-emitting unit emits light according to the driving current provided by the pixel circuit. Then, the first light emission data of each sub-region is acquired, and an adjustment voltage for each sub-region is formed based on each first light emission data and second light emission data. The second gate voltage of the driving transistor in the pixel circuit of each sub-region is adjusted according to the adjustment voltage of each sub-region, and / or the fourth gate voltage of the first transistor is adjusted, thereby compensating for the brightness of each sub-region separately, improving the brightness compensation accuracy of the first display area. For example, each sub-region includes at least one pixel unit, and each pixel unit includes at least two pixel circuits, which are used to provide driving current for light-emitting units of different emission colors.

[0140] This invention also provides a brightness compensation device for a display panel, used to compensate for the brightness of the display panel provided in any embodiment of this invention. Figure 16 This invention provides a brightness compensation device for a display panel. For example... Figure 16 As shown, the brightness compensation device for the display panel includes:

[0141] The acquisition module 100 is used to acquire first light emission data of the first display area and second light emission data of the second display area;

[0142] The determining module 200 is used to determine the adjustment voltage of the first display area based on the first light emission data and the second light emission data;

[0143] The compensation module 300 is used to adjust the second gate voltage of the first driving transistor in the first display area according to the adjustment voltage, so as to compensate for the brightness of the first display area; and / or,

[0144] Adjusting the fourth gate voltage of the first transistor within the first display area according to the adjustment voltage to compensate for the brightness of the first display area.

[0145] The technical solution of this invention involves an acquisition module acquiring first light-emitting data of a first display area and second light-emitting data of a second display area. A determination module then determines an adjustment voltage for the first display area based on the first and second light-emitting data. A compensation module adjusts the voltage of the second gate based on the adjustment voltage, thereby adjusting the threshold voltage of the first driving transistor and consequently, the driving current of the first driving transistor. Alternatively, the compensation module adjusts the voltage of the fourth gate based on the adjustment voltage, thereby adjusting the threshold voltage of the first transistor and consequently, the amount of charge written by the first transistor to the first gate, i.e., adjusting the potential of the first gate, and consequently, adjusting the driving current of the first driving transistor. This ensures that when the driving current provided by the first driving transistor drives the first light-emitting device to emit light, it can compensate for the difference in the light-emitting state between the first and second light-emitting devices, thereby compensating for the brightness of the first display area, improving the display uniformity between the first and second display areas, and ultimately improving the display effect of the display panel.

[0146] Optionally, when the first emission data includes first brightness data and the second emission data includes second brightness data, the determining module may include:

[0147] The first determining unit is used to determine the current of the first driving transistor in the first display area based on the first brightness data and the first efficiency decay curve; wherein, the first efficiency decay curve is the efficiency decay curve of the first light-emitting unit in the first display area.

[0148] The second determining unit is used to determine the current of the second driving transistor in the second display area based on the second brightness data and the second efficiency decay curve; wherein, the second efficiency decay curve is the efficiency decay curve of the second light-emitting unit in the second display area;

[0149] The third determining unit is used to determine the adjustment voltage of the first display area based on the difference between the current current of the first driving transistor in the first display area and the current current of the second driving transistor in the second display area.

[0150] Optionally, the brightness compensation device for the display panel also includes:

[0151] The acquisition unit is used to acquire the first cumulative light emission time of the first light-emitting unit in the first display area and the second cumulative light emission time of the second light-emitting unit in the second display area;

[0152] The fourth determining unit is used to determine the first efficiency decay curve based on the first cumulative emission time;

[0153] The fifth determining unit is used to determine the second efficiency decay curve based on the second cumulative emission time.

[0154] Optionally, the display panel includes pixel units, and the pixel units include light-emitting units of at least two light-emitting colors; when the first light-emitting data includes first chromaticity data and the second light-emitting data includes second chromaticity data, the determining module further includes:

[0155] The sixth determining unit is used to determine the brightness difference data of light-emitting units with the same emitting color in the first display area and the second display area based on the first chromaticity data and the second chromaticity data;

[0156] The seventh determining unit is used to determine the current difference of the driving transistors in the first display area and the second display area based on the brightness difference data and the efficiency decay curves of the light-emitting units with different light-emitting colors.

[0157] The eighth determining unit is used to determine the adjustment voltage of the first display area based on the current difference.

[0158] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that, It includes a non-display area, a first display area, and a second display area, wherein the second display area at least partially surrounds the first display area, and the light transmittance of the first display area is greater than that of the second display area; The first display area is provided with a first pixel circuit, the first pixel circuit includes a first driving transistor, the first driving transistor includes a first electrode, a second electrode and a first gate; the first electrode of the first driving transistor is connected to a power signal line, the second electrode of the first driving transistor is connected to a first light-emitting device; the first gate is used to write data voltage. The first driving transistor further includes a second gate; the second gate is used to receive an adjustment voltage; and / or, the first pixel circuit further includes a first transistor, the first transistor being connected between the first gate and the second terminal of the first driving transistor; the first transistor includes a third gate and a fourth gate, the third gate being used to receive a scan signal, and the fourth gate being used to receive the adjustment voltage; The non-display area is provided with a driving chip. The driving chip is used to acquire first light-emitting data of the first display area and second light-emitting data of the second display area, determine the current of the first driving transistor in the first display area based on the first brightness data and the first efficiency decay curve, determine the current of the second driving transistor in the second display area based on the second brightness data and the second efficiency decay curve, determine the threshold voltage difference between the first driving transistor in the first display area and the second driving transistor in the second display area based on the difference between the current current of the first driving transistor in the first display area and the current current of the second driving transistor in the second display area, and determine the back gate voltage difference between the first driving transistor in the first display area and the second driving transistor in the second display area based on the threshold voltage difference, and use the back gate voltage difference as the adjustment voltage; wherein, the first light-emitting data includes the first brightness data, the second light-emitting data includes the second brightness data; the first efficiency decay curve is the efficiency decay curve of the first light-emitting unit in the first display area; the second efficiency decay curve is the efficiency decay curve of the second light-emitting unit in the second display area; The first display area is provided with a plurality of first pixel circuits, and each of the second gate and / or the fourth gate is respectively connected to the driving chip through a conductive line; The display panel further includes a first voltage signal line; the second display area is provided with a second pixel circuit, the second pixel circuit includes a second driving transistor, the second driving transistor includes a first electrode, a second electrode and a fifth gate; the second driving transistor further includes a sixth gate, the sixth gate is connected to the first voltage signal line.

2. The display panel according to claim 1, characterized in that, The first terminal of the second driving transistor is connected to the power signal line, the second terminal of the second driving transistor is connected to the second light-emitting device, and the fifth gate is used to write the data voltage; The display panel further includes a second voltage signal line; the second pixel circuit further includes a second transistor, which is connected between the fifth gate and the second electrode of the second driving transistor; the second transistor includes a seventh gate and an eighth gate, the seventh gate being used to receive the scan signal, and the eighth gate being connected to the second voltage signal line.

3. The display panel according to claim 2, characterized in that, The power signal line is multiplexed as the first voltage signal line.

4. A brightness compensation method for a display panel, used to compensate the brightness of the display panel according to any one of claims 1-3; characterized in that, include: Acquire the first light emission data of the first display area and the second light emission data of the second display area; The adjustment voltage of the first display area is determined based on the first light emission data and the second light emission data; The second gate voltage of the first driving transistor in the first display area is adjusted according to the adjustment voltage to compensate for the brightness of the first display area; And / or, The fourth gate voltage of the first transistor in the first display area is adjusted according to the adjustment voltage to compensate for the brightness of the first display area.

5. The method according to claim 4, characterized in that, The first light emission data includes first brightness data, and the second light emission data includes second brightness data; determining the adjustment voltage of the first display area based on the first light emission data and the second light emission data includes: The current of the first driving transistor in the first display area is determined based on the first brightness data and the first efficiency decay curve; wherein, the first efficiency decay curve is the efficiency decay curve of the first light-emitting unit in the first display area. The current of the second driving transistor in the second display area is determined based on the second brightness data and the second efficiency decay curve; wherein, the second efficiency decay curve is the efficiency decay curve of the second light-emitting unit in the second display area; The adjustment voltage of the first display area is determined based on the difference between the current current of the first driving transistor in the first display area and the current current of the second driving transistor in the second display area.

6. The method according to claim 5, characterized in that, Before determining the adjustment voltage of the first display area based on the first emission data and the second emission data, the method further includes: Obtain the first cumulative light emission time of the first light-emitting unit in the first display area and the second cumulative light emission time of the second light-emitting unit in the second display area; The first efficiency decay curve is determined based on the first cumulative emission time; The second efficiency decay curve is determined based on the second cumulative emission time.

7. The method according to claim 4, characterized in that, The display panel includes pixel units, and the pixel units include light-emitting units of at least two light-emitting colors; the first light-emitting data includes first chromaticity data, and the second light-emitting data includes second chromaticity data; Determining the adjustment voltage of the first display area based on the first emission data and the second emission data includes: The luminous brightness of the light-emitting units of different luminous colors in the first display area and the second display area is determined based on the first chromaticity data and the second chromaticity data. The current difference of the driving transistors in the first display area and the second display area is determined based on the luminous brightness and the efficiency decay curves of the luminous units with different luminous colors. The adjustment voltage of the first display area is determined based on the current difference.

8. The method according to claim 4, characterized in that, The first display area includes at least two sub-regions, and each sub-region includes at least one pixel circuit; the adjustment voltages corresponding to different sub-regions are different.

9. A brightness compensation device for a display panel, used to compensate the brightness of the display panel according to any one of claims 1-3; characterized in that, include: The acquisition module is used to acquire the first light emission data of the first display area and the second light emission data of the second display area; The determining module is used to determine the adjustment voltage of the first display area based on the first light emission data and the second light emission data; The compensation module is used to adjust the second gate voltage of the first driving transistor in the first display area according to the adjustment voltage, so as to compensate for the brightness of the first display area; And / or, The fourth gate voltage of the first transistor in the first display area is adjusted according to the adjustment voltage to compensate for the brightness of the first display area.

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