Display device and compensation method thereof

Abstract

The application relates to a display device and a compensation method thereof; a pixel circuit of the display device comprises a driving transistor and a light-emitting device, the driving transistor and the light-emitting device are connected to a first node, the compensation method firstly obtains an initial data voltage of a target sub-pixel, obtains and determines a voltage offset of the first node according to a correlation curve of the data voltage and the voltage offset of the first node and based on the initial data voltage, and determines a target data voltage of the target sub-pixel according to the initial data voltage and the voltage offset of the first node; the application obtains the voltage offset of the first node through the correlation curve of the data voltage and the voltage offset of the first node and based on the initial data voltage input to the target sub-pixel, corrects the data voltage input to the target sub-pixel according to the voltage offset of the position, eliminates the technical problem that the potential difference between the gate end and the source end of the driving transistor deviates, and corrects the working current flowing into the light-emitting device.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display device and its compensation method. Background Technology

[0002] OLED (Organic Light-Emitting Diode) display technology is a new type of display technology that has gradually attracted attention due to its unique advantages such as low power consumption, high saturation, fast response time and wide viewing angle, and has occupied a certain position in the field of panel display technology.

[0003] In related technologies, OLED display panels typically have pixel circuits including driving transistors within their sub-pixels. However, due to leakage current, the potential at the source terminal of the output transistor deviates, causing a deviation in the potential difference between the gate and source terminals of the driving transistor. This results in a shift in the operating current flowing into the light-emitting device, leading to abnormalities in the display panel's display. Summary of the Invention

[0004] This application proposes a display device and a compensation method thereof to solve the technical problem of the working current deviation of the light-emitting device in existing display devices.

[0005] To solve the above problems, the technical solution provided in this application is as follows:

[0006] This application provides a compensation method for a display device, the display device comprising a plurality of sub-pixels having pixel circuits, each pixel circuit comprising a switching transistor, a driving transistor, and a light-emitting device, wherein a first electrode of the driving transistor is connected to a first potential line, a second electrode of the driving transistor and the anode of the light-emitting device are electrically connected to a first node, a first electrode of the switching transistor is connected to a data signal terminal, and a second electrode of the switching transistor and the gate of the driving transistor are electrically connected to a second node; wherein the compensation method includes:

[0007] Obtain the initial data voltage of the target sub-pixel;

[0008] Obtain the correlation curve between the data voltage and the voltage offset of the first node;

[0009] The voltage offset of the first node is determined based on the correlation curve between the data voltage and the voltage offset of the first node and the initial data voltage.

[0010] The target data voltage of the target sub-pixel is determined based on the initial data voltage and the voltage offset of the first node;

[0011] The target data voltage is input to the data signal terminal of the target sub-pixel.

[0012] In the compensation method of this application, the cathode of the light-emitting device is electrically connected to the second potential line, and the step of obtaining the correlation curve between the data voltage and the voltage offset of the first node includes:

[0013] Obtain the first test voltage of the second potential line for one of the plurality of sub-pixels under the reference data voltage;

[0014] Obtain multiple second test voltages of the second potential line for the test sub-pixel under different test data voltages;

[0015] Based on multiple differences between the first test voltage and the second test voltage, obtain the correlation curve between the data voltage and the voltage offset of the second potential line;

[0016] Based on the correlation curve between the data voltage and the voltage offset of the second potential line, and based on the correlation curve between the voltage offset of the second potential line and the voltage offset of the first node, the correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node is obtained.

[0017] Based on the correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node, the correlation curve between the data voltage of the display device and the voltage offset of the first node is obtained.

[0018] In the compensation method of this application, the cathode of the light-emitting device is electrically connected to the second potential line, and the step of obtaining the correlation curve between the data voltage and the voltage offset of the first node includes:

[0019] Obtain the third test voltage of the first node for one of the plurality of sub-pixels under the reference data voltage;

[0020] Obtain multiple fourth test voltages of the first node under different test data voltages for the test sub-pixel;

[0021] Based on multiple differences between the third test voltage and the fourth test voltage, obtain the correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node;

[0022] Based on the correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node, the correlation curve between the data voltage of the display device and the voltage offset of the first node is obtained.

[0023] In the compensation method of this application, before the step of obtaining the first test voltage of the second potential line of a test sub-pixel among the plurality of sub-pixels under the reference data voltage, the method further includes:

[0024] The input driving voltage of the plurality of sub-pixels at the second node and the input data voltage of the data signal terminal of the plurality of sub-pixels are obtained;

[0025] When the difference between the input driving voltage and the input data voltage is less than a first threshold, the sub-pixel is a test sub-pixel.

[0026] In the compensation method of this application, the step of obtaining the correlation curve between the data voltage of the display device and the voltage offset of the first node based on the correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node includes:

[0027] Obtain the correlation curves between the data voltage of multiple test sub-pixels and the voltage offset of the first node;

[0028] The correlation curves between the data voltage of the multiple test sub-pixels and the voltage offset of the first node are fitted to obtain the correlation curve between the data voltage of the display device and the voltage offset of the first node.

[0029] In the compensation method of this application, the display grayscale of the test sub-pixel is 0 under the reference data voltage, and the display grayscale of the test sub-pixel is greater than 0 under different test data voltages.

[0030] In the compensation method of this application, the step of determining the target data voltage of the target sub-pixel based on the initial data voltage and the voltage offset of the first node includes:

[0031] Obtain the first output voltage of the first node;

[0032] Based on the first output voltage and the voltage offset of the first node, obtain the second output voltage of the first node;

[0033] The target data voltage of the target sub-pixel is determined based on the initial data voltage and the second output voltage.

[0034] In the compensation method of this application, the step of determining the target data voltage of the target sub-pixel based on the initial data voltage and the voltage offset of the first node includes:

[0035] Obtain the initial compensation coefficient of the initial data voltage;

[0036] The compensation offset coefficient is determined based on the initial data voltage and the voltage offset of the first node;

[0037] The target compensation coefficient for the initial data voltage is determined based on the initial compensation coefficient and the compensation offset coefficient.

[0038] The target data voltage of the target sub-pixel is determined based on the target compensation coefficient and the initial data voltage.

[0039] This application also proposes a display device, the display device including a display panel, the display panel including a plurality of sub-pixels having pixel circuits, each pixel circuit including a switching transistor, a driving transistor and a light-emitting device, the first electrode of the driving transistor being connected to a first potential line, the second electrode of the driving transistor being electrically connected to the anode of the light-emitting device being electrically connected to a first node, the first electrode of the switching transistor being connected to a data signal terminal, and the second electrode of the switching transistor being electrically connected to the gate of the driving transistor being electrically connected to a second node; wherein, the display device further includes:

[0040] The data voltage module is used to acquire the initial data voltage of the target sub-pixel;

[0041] The correlation curve module is used to obtain the correlation curve between the data voltage and the voltage offset of the first node;

[0042] The offset voltage module determines the voltage offset of the first node based on the correlation curve between the data voltage and the voltage offset of the first node and the initial data voltage.

[0043] The calculation module is used to determine the target data voltage of the target sub-pixel based on the initial data voltage and the voltage offset of the first node;

[0044] A transmission module is used to input the target data voltage to the data signal terminal of the target sub-pixel.

[0045] In the display device of this application, the pixel circuit further includes:

[0046] A detection device is connected to the cathode of the light-emitting device and the second potential line, and the detection device is used to acquire the potential of the second potential line.

[0047] This application relates to a display device and a compensation method thereof. The pixel circuit of the display device includes a driving transistor and a light-emitting device, which are connected to a first node. The compensation method first obtains the initial data voltage of the target sub-pixel, obtains and determines the voltage offset of the first node based on the correlation curve between the data voltage and the voltage offset of the first node, and determines the target data voltage of the target sub-pixel based on the initial data voltage and the voltage offset of the first node. This application obtains the voltage offset of the first node based on the correlation curve between the data voltage and the voltage offset of the first node, and corrects the data voltage input to the target sub-pixel based on the voltage offset at that position. This eliminates the technical problem of deviation caused by the potential difference between the gate and source terminals of the driving transistor, and corrects the operating current flowing into the light-emitting device. Attached Figure Description

[0048] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0049] Figure 1 A structural diagram of the display device provided in this application.

[0050] Figure 2 This is a first structural diagram of the pixel circuit of the display device provided in this application.

[0051] Figure 3 A flowchart illustrating the compensation method for the display device provided in this application.

[0052] Figure 4 A correlation curve of the initial data voltage and the voltage offset of the second potential line in the display device provided in this application.

[0053] Figure 5 This is a second structural diagram of the pixel circuit of the display device provided in this application.

[0054] Figure 6 A correlation curve between the initial data voltage and the voltage offset of the first node in the display device provided in this application.

[0055] Figure 7 A module distribution diagram of the display device provided in this application. Detailed Implementation

[0056] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0057] Please see Figure 1 and Figure 2 The display device 100 includes a display panel 200 and a driving module 300. The display panel 200 includes multiple data lines and multiple scan lines. One data line is connected to multiple data signal terminals (Data), and one scan line is connected to multiple scan signal terminals (Scan). The multiple data lines and multiple scan lines form multiple sub-pixels 201. Each sub-pixel 201 has a pixel circuit 400.

[0058] exist Figure 1 In the structure, the driving module 300 may include a timing controller 310, a data processor 320, a row scanning circuit 330, and a column scanning circuit 340. The timing controller 310 controls the row scanning circuit 330 to output a scanning signal to the display panel 200, the timing controller 310 outputs an image data signal to the data processor 320, and the data processor 320 transmits a data voltage signal to the column scanning circuit 340 according to the image data signal.

[0059] It should be noted that the row scanning circuit 330 and / or column scanning circuit 340 can also be directly integrated into the display panel 200.

[0060] exist Figure 2 In the structure, the pixel circuit 400 includes a switching transistor T1, a driving transistor T2, and a calibration transistor T3. The gate of the switching transistor T1 is connected to the scan signal terminal Scan. The first electrode of the switching transistor T1 is connected to the data signal terminal Data. The second electrode of the switching transistor T1 and the gate of the driving transistor T2 are connected to the second node G. The first electrode of the driving transistor T2 is connected to the first potential line VDD. The second electrode of the driving transistor T2 and the anode of the light-emitting device 420 are connected to the first node S. The cathode of the light-emitting device 420 and the second potential line VSS are connected to the third node H. The first electrode of the calibration transistor T3 is connected to the calibration module 410. The gate of the calibration transistor T3 is connected to the scan signal terminal Scan. The second electrode of the calibration transistor T3 is connected to the second electrode of the driving transistor T2 and the anode of the light-emitting device 420.

[0061] In this embodiment, the calibration module 410 includes a calibration device 411 and a measuring device 412. A first switch 413 is provided between the calibration device 411 and the first electrode of the calibration transistor T3, and a second switch 414 is provided between the measuring device 412 and the first electrode of the calibration transistor T3. The calibration device 411 is used to calibrate the potential of the first node S to a reference potential, and the measuring device 412 is used to acquire the potential of the first node S.

[0062] It should be noted that the first potential line VDD in this application is a high potential line, and the second potential line VSS is a low potential line.

[0063] It should be noted that the first electrode in this application is either the source or the drain, and the second electrode is either the source or the drain; the following embodiments describe the technical solution of this application with the first electrode as the drain and the second electrode as the source.

[0064] exist Figure 2 During the detection phase of the middle pixel circuit 400, Figure 1 When sub-pixel 201 transitions from a black screen to a white screen, the first node S leaks current to the light-emitting device 420 and transmits it to the second potential line VSS. Therefore, the potential of the first node S is lower than the preset potential. The operating current of the light-emitting device 420 is determined by the potential difference between the second node G and the first node S. If the potential of the second node G remains constant while the potential of the first node S decreases, the actual operating current of the light-emitting device 420 is greater than the target operating current, resulting in abnormal display on the display panel 200. Based on the above technical problems, this application proposes a compensation method for the display device 100.

[0065] In this embodiment, the pixel circuit 400 can be a 2T1C, 3T1C, 4T1C, or other similar circuit structures. The following embodiments will use... Figure 2 The 3T1C pixel circuit 400 in the example will be used for explanation.

[0066] Please see Figures 1 to 3 The compensation method for the display device 100 may include:

[0067] S10, Obtain the initial data voltage of the target sub-pixel;

[0068] S20, obtain the correlation curve between the data voltage and the voltage offset of the first node S;

[0069] S30, and determine the output voltage offset of the first node S based on the initial data voltage;

[0070] S40, determine the target data voltage of the target sub-pixel based on the initial data voltage and the voltage offset of the first node S;

[0071] S50 inputs the target data voltage to the data signal terminal of the target sub-pixel.

[0072] This application obtains the voltage offset of the first node S by using the correlation curve between the data voltage and the voltage offset of the first node S, and based on the initial data voltage input to the target sub-pixel, and corrects the data voltage input to the target sub-pixel according to the voltage offset of the first node S, thereby eliminating the technical problem of deviation caused by the potential difference between the gate and source terminals of the driving transistor T2, and correcting the operating current flowing into the light-emitting device 420.

[0073] It should be noted that the target sub-pixel can be any sub-pixel 201 in the display device 100, and the initial data voltage of the target sub-pixel can be the input data voltage Vdata of the data signal terminal Data connected to the first electrode of the switching transistor T1. Vdata is the data voltage that matches the image data signal output by the timing controller 310. Due to the influence of resistors and capacitors, the image data signal output by the timing controller 310 does not match the required data voltage. Therefore, when the data processor 320 outputs the data voltage, it is necessary to compensate the data voltage that matches the image data signal output by the timing controller 310 so that the display grayscale of the target sub-pixel is the target grayscale. Therefore, the data voltage received by the data signal terminal Data is usually N*Vdata, where N is the compensation coefficient.

[0074] It should be noted that data voltage compensation can also be completed within the timing controller 310, meaning the timing controller 310 can directly output an image data signal that matches the data voltage N*Vdata.

[0075] The technical solution of this application is described below with reference to specific embodiments.

[0076] Since the leakage current transmitted from the second electrode of the driving transistor T2 to the light-emitting device 420 is different when the driving transistor T2 receives different data voltages, this application needs to store the correlation curve between the data voltage and the voltage offset of the first node S in the display device 100 before correcting the data voltage input to the target sub-pixel. For example, the correlation curve can be stored in the driving module 300.

[0077] In this embodiment, the step of obtaining the correlation curve between the data voltage and the voltage offset of the first node S includes:

[0078] The process involves: acquiring a first test voltage of a test sub-pixel from multiple sub-pixels 201 at a reference data voltage for the second potential line VSS; acquiring multiple second test voltages of the test sub-pixel at different test data voltages for the second potential line VSS; obtaining a correlation curve between the data voltage and the voltage offset of the second potential line VSS based on multiple differences between the first and second test voltages; obtaining a correlation curve between the data voltage and the voltage offset of the second potential line VSS, and based on the correlation curve between the voltage offset of the second potential line VSS and the voltage offset of the first node S; and finally, obtaining a correlation curve between the data voltage of the display device 100 and the voltage offset of the first node S based on the correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node S.

[0079] In this embodiment, the correlation curve between the data voltage of the test sub-pixel and the offset of the voltage of the first node S can be the correlation curve between the initial data voltage of the test sub-pixel and the offset of the voltage of the first node S.

[0080] In this embodiment, any one of the multiple sub-pixels 201 in the display device 100 is used as the test sub-pixel. When the input reference data voltage is N0*Vdata0, the first test voltage Vss0 of the second potential line VSS can be directly obtained by an external measuring device. When the second potential line VSS transmits a low-level signal to the inside of the display panel 200, due to the resistance, the potential of the low-level signal transmitted by the second potential line VSS is different from the low-level potential actually input to the inside of the display panel 200. Therefore, the external measuring device of this application can directly measure the potential of the second potential line VSS at the receiving end of the low-level signal in the display panel 200 to reduce the measurement error of the potential of the second potential line VSS.

[0081] For different test data voltages, for example, when the test data voltage is N1*Vdata1, the second test voltage of the second potential line VSS can be Vss1. Then, when the initial data voltage is Vdata1, the voltage offset of the second potential line VSS is the difference between Vss1 and Vss0. When the test data voltage is N2*Vdata2, the second test voltage of the second potential line VSS can be Vss2. Then, when the initial data voltage is Vdata2, the voltage offset of the second potential line VSS is the difference between Vss2 and Vss0. Similarly, when the test data voltage is Nn*Vdatan, the second test voltage of the second potential line VSS can be Vssn. Then, when the initial data voltage is Vdatan, the voltage offset of the second potential line VSS is the difference between Vssn and Vss0. Based on the measured data above... Figure 4The correlation curve Vss' = f(Vdata) between the initial data voltage and the voltage offset of the second potential line VSS can be stored in the drive module 300.

[0082] It should be noted that since all transistors in the display device 100 are fabricated in the same process, the leakage current of each driving transistor T2 can be considered the same in this application. That is, in this embodiment, a sub-pixel 201 is used as the measurement sub-pixel, that is, the correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node S can be applied to all driving transistors T2 in the display device 100 to obtain the correlation curve between the initial data voltage and the voltage offset of the first node S in all driving transistors T2 in the display device 100. In this embodiment, since the voltage offset of the second potential line VSS is caused by leakage from the first node S to the second potential line VSS, the voltage offset of the first node S and the voltage offset of the second potential line VSS are positively correlated. For example, the voltage offset Vs' of the first node S = g * Vss', where g is the offset coefficient. Based on the correlation curve between the voltage offset of the first node S and the voltage offset of the second potential line VSS, the correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node S is obtained.

[0083] It should be noted that, since the output of the driving transistor T2 does not transmit leakage current to the light-emitting device 420 when the sub-pixel 201 is displaying a black screen, and the output of the driving transistor T2 transmits leakage current to the light-emitting device 420 when the sub-pixel 201 is displaying a white screen, this application can use the potential of the second potential line VSS when the display panel 200 displays a black screen as the reference test potential, and the potential of the second potential line VSS when the display panel 200 displays a white screen as the offset test potential; for example, the display grayscale of the test sub-pixel under the reference data voltage is 0, and the display grayscale of the test sub-pixel under different test data voltages is greater than 0.

[0084] Please see Figure 5 In this application, a detection device 430 can be set at the third node H between the light-emitting device 420 and the second potential line VSS. The detection device 430 can acquire the potential of the third node H in real time. The detection device 430 and the measurement device 412 can both be the same type of sampling device; or, the potential of the third node H can be directly measured by the measurement device 412, and the potentials of the third node H and the first node S can be acquired by time division.

[0085] Since the measuring device 412 can acquire the potential of the first node S, this application can also directly obtain the correlation curve between the potential of the first node S and the initial data voltage without measuring the potential of the second potential line VSS; therefore, the step of obtaining the correlation curve between the data voltage and the voltage offset of the first node S includes:

[0086] The process involves: acquiring a third test voltage of a test sub-pixel from multiple sub-pixels 201 under a reference data voltage; acquiring multiple fourth test voltages of the first node S for the test sub-pixel under different test data voltages; obtaining a correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node S based on multiple differences between the third and fourth test voltages; and obtaining a correlation curve between the data voltage of the display device 100 and the voltage offset of the first node S based on the correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node S.

[0087] In this embodiment, any one of the multiple sub-pixels 201 in the display device 100 is used as the test sub-pixel. When the input reference data voltage is N0*Vdata0, the third test voltage Vs0 of the first node S can be obtained using the measuring device 412. For different test data voltages, for example, when the test data voltage is N1*Vdata1, the fourth test voltage of the first node S can be Vs1. Then, at the initial data voltage Vdata1, the voltage offset of the first node S is the difference between Vs1 and Vs0. When the test data voltage is N2*Vdata2, the fourth test voltage of the first node S can be Vs2. Then, at the initial data voltage Vdata2, the voltage offset of the first node S is the difference between Vs2 and Vs0. When the test data voltage is Nn*Vdatan, the fourth test voltage of the first node S can be Vsn. Then, at the initial data voltage Vdatan, the voltage offset of the first node S is the difference between Vsn and Vs0. Based on the above measured data, the following is obtained: Figure 6 The correlation curve between the initial data voltage and the voltage offset of the first node S is Vs' = f(Vdata).

[0088] Similarly, since all transistors in the display device 100 are fabricated in the same process, the leakage current of each driving transistor T2 can be considered the same in this application. That is, in this embodiment, a sub-pixel 201 is used as the measurement sub-pixel 201, that is, the correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node S can be applied to all driving transistors T2 in the display device 100 to obtain the correlation curve between the initial data voltage and the voltage offset of the first node S in all driving transistors T2 in the display device 100.

[0089] Meanwhile, in the same process, the structures of different transistors may still differ, resulting in differences in the threshold voltage of the driving transistor T2 of different sub-pixels 201. That is, the correlation curves between the initial data voltage of the driving transistor T2 of different sub-pixels 201 and the voltage offset of the first node S are different.

[0090] Based on the above embodiments, the compensation method for the display device 100 may further include:

[0091] Obtain the correlation curves between the data voltage of multiple test sub-pixels and the voltage offset of the first node S; fit the correlation curves between the data voltage of multiple test sub-pixels and the voltage offset of the first node S to obtain the correlation curve between the data voltage of the display device 100 and the voltage offset of the first node S.

[0092] This application can ensure the accuracy of the correlation curve between the initial data voltage and the voltage offset of the first node S in the display device 100 by measuring the correlation curve between the initial data voltage and the voltage offset of the first node S of the driving transistor T2 of different sub-pixels 201 and by fitting multiple correlation curves.

[0093] Based on the above embodiments, before the step of obtaining the first test voltage of the second potential line VSS of a test sub-pixel among multiple sub-pixels 201 under the reference data voltage, the method may further include:

[0094] The input driving voltage of multiple sub-pixels 201 at the second node G and the input data voltage of the data signal terminal Data in the multiple sub-pixels 201 are obtained; when the difference between the input driving voltage and the input data voltage is less than the first threshold, the sub-pixel 201 is a test sub-pixel.

[0095] Since there are a large number of sub-pixels 201 in the display device 100, obtaining the correlation curve between the initial data voltage of the driving transistor T2 in each sub-pixel 201 and the voltage offset of the first node S is a large workload. Therefore, this application can select some sub-pixels 201 as test sub-pixels. For example, in the display panel 200, the area near the driving module 300 has a smaller distance from the driving module 300, and the input data voltage is less affected by resistors and capacitors during transmission. However, in the area with a larger distance from the driving module 300, the input data voltage is more affected by resistors and capacitors during transmission. Therefore, the potential of the second node G in the pixel circuit 400 in the area near the driving module 300 is more accurate, the difference between the potential of the second node G and the input data voltage transmitted from the data signal terminal Data is smaller, and the measurement accuracy of the voltage offset of the first node S is higher.

[0096] In this embodiment, the first threshold can be 0.1V to 0.5V.

[0097] This application uses the difference between the potential of the second node G and the input data voltage from the data signal terminal Data as a benchmark, and uses sub-pixels 201 whose difference is less than a first threshold as test sub-pixels. The potential of the second node G is closer to the input data voltage of the data signal terminal Data, making the potential of the second node G more accurate and improving the accuracy of the measurement of the voltage offset of the first node S.

[0098] In this embodiment, the step of determining the target data voltage of the target sub-pixel based on the initial data voltage and the voltage offset of the first node S includes:

[0099] Obtain the first output voltage of the first node S; obtain the second output voltage of the first node S based on the first output voltage and the voltage offset of the first node S; determine the target data voltage of the target sub-pixel based on the initial data voltage and the second output voltage.

[0100] In this embodiment, the first output voltage is the actual potential of the first node S after leakage, and the second output voltage is the potential of the first node S before leakage. Therefore, this application needs to correct the potential of the first node S to Vsb, but the potential of the first node S cannot be accurately corrected. At this time, it can only be corrected by correcting the data voltage input at the data signal terminal Data.

[0101] In this embodiment, since the correlation curve Vs' = f(Vdata) between the initial data voltage and the voltage offset of the first node S is known, and the initial data voltage Vdata of the target sub-pixel is known, the voltage offset Vs' of the target sub-pixel at the first node S can be obtained.

[0102] In this embodiment, the first output voltage Vsa of the first node S is obtained using the measuring device 412, and the second output voltage Vsb of the first node S is obtained as the sum of Vsa and Vs' based on the voltage offset Vs' of the target sub-pixel at the first node S. According to the formula for the operating current of the light-emitting device 420, I = K(Vg - Vs - Vth). 2 When Vs is corrected to Vsb, the corrected operating current can be obtained; however, when the same operating current is guaranteed, Vs cannot be corrected to Vsb. Therefore, Vg is corrected to the target data voltage using the above formula to obtain the target data voltage of the target sub-pixel.

[0103] It should be noted that since the data voltage transmitted by the data signal terminal Data can be N1*Vdata, and since Vdata will not change before and after the correction, this application can correct the data voltage transmitted by the data signal terminal Data to the target data voltage by modifying the compensation coefficient, for example, correcting the original data voltage N1*Vdata transmitted by the data signal terminal Data to N2*Vdata.

[0104] In this embodiment, the step of determining the target data voltage of the target sub-pixel based on the initial data voltage and the voltage offset of the first node S includes:

[0105] Obtain the initial compensation coefficient of the initial data voltage; determine the compensation offset coefficient based on the initial data voltage and the voltage offset of the first node S; determine the target compensation coefficient of the initial data voltage based on the initial compensation coefficient and the compensation offset coefficient; determine the target data voltage of the target sub-pixel based on the target compensation coefficient and the initial data voltage.

[0106] In this embodiment, the data voltage transmitted by the data signal terminal Data before correction can be N1*Vdata, and the target data voltage transmitted by the data signal terminal Data after correction is N2*Vdata. Therefore, the difference between the data voltage before and after correction is equal to the voltage offset Vs' of the first node S. It can be known that the target compensation coefficient of the initial data voltage is N2 = N1 - (Vs' / Vdata). Since Vdata will not change before and after correction, this application can use the target compensation coefficient and the initial data voltage Vdata to correct the original data voltage N1*Vdata transmitted by the data signal terminal Data to N2*Vdata = N1*Vdata - Vs'.

[0107] This application stores the correlation curve between the data voltage and the voltage offset of the first node S in the driving module 300, such as in the timing controller. When the timing controller outputs the initial data voltage to the target sub-pixel, it calls the correlation curve and obtains the voltage offset of the first node S based on the initial data voltage input to the target sub-pixel. The data voltage input to the target sub-pixel is then corrected according to the voltage offset of the first node to output the target data voltage to the data signal terminal Data. This eliminates the technical problem of deviation caused by the potential difference between the gate and source terminals of the driving transistor T2 and corrects the operating current flowing into the light-emitting device 420.

[0108] Please see Figure 1 The display device 100 includes a display panel 200 and a driving module 300. The display panel 200 includes multiple data lines and multiple scan lines. One data line is connected to multiple data signal terminals (Data), and one scan line is connected to multiple scan signal terminals (Scan). The multiple data lines and multiple scan lines form multiple sub-pixels 201. Each sub-pixel 201 has a pixel circuit 400.

[0109] In this embodiment, the pixel circuit 400 can be a 2T1C, 3T1C, 4T1C, or other similar circuit structures. The following embodiments will use... Figure 2 The 3T1C pixel circuit 400 in the example will be used for explanation.

[0110] In this embodiment, please refer to Figure 2 and Figure 5 The pixel circuit 400 includes a switching transistor T1, a driving transistor T2, and a calibration transistor T3. The gate of the switching transistor T1 is connected to the scan signal terminal Scan. The first electrode of the switching transistor T1 is connected to the data signal terminal Data. The second electrode of the switching transistor T1 and the gate of the driving transistor T2 are connected to the second node G. The first electrode of the driving transistor T2 is connected to the first potential line VDD. The second electrode of the driving transistor T2 and the anode of the light-emitting device 420 are connected to the first node S. The cathode of the light-emitting device 420 is connected to the second potential line VSS. The first electrode of the calibration transistor T3 is connected to the calibration module 410. The gate of the calibration transistor T3 is connected to the scan signal terminal Scan. The second electrode of the calibration transistor T3 is connected to the second electrode of the driving transistor T2 and the anode of the light-emitting device 420.

[0111] In this embodiment, please refer to Figure 5 The pixel circuit 400 also includes a detection device 430, a third node H connected between the cathode of the light-emitting device 420 and the second potential line VSS, and the detection device 430 is used to acquire the potential of the second potential line VSS.

[0112] Please see Figure 7 The display device 100 also includes a data voltage module 110, a correlation curve module 120, an offset voltage module 130, a calculation module 140, and a transmission module 150. The data voltage module 110, the correlation curve module, the offset voltage module 130, the calculation module 140, and the transmission module can all be located in the drive module 300, for example, integrated in timing control.

[0113] In this embodiment, the data voltage module 110 is used to acquire the initial data voltage of the target sub-pixel; the correlation curve module 120 is used to acquire the correlation curve between the data voltage and the voltage offset of the first node S; the offset voltage module 130 is used to determine the voltage offset of the first node S based on the correlation curve between the data voltage and the voltage offset of the first node S and the initial data voltage; the calculation module 140 is used to determine the target data voltage of the target sub-pixel based on the initial data voltage and the voltage offset of the first node S; and the transmission module 150 is used to input the target data voltage to the data signal terminal Data of the target sub-pixel.

[0114] In this embodiment, the display device 100 is further configured to: acquire a first test voltage of a test sub-pixel among a plurality of sub-pixels 201 at a reference data voltage for a second potential line VSS; acquire a plurality of second test voltages of the test sub-pixel at different test data voltages for the second potential line VSS; acquire a correlation curve between the data voltage and the voltage offset of the second potential line VSS based on a plurality of differences between the first test voltage and the second test voltage; and acquire a correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node S based on the correlation curve between the data voltage and the voltage offset of the second potential line VSS, and based on the correlation curve between the voltage offset of the second potential line VSS and the voltage offset of the first node S.

[0115] In this embodiment, the display device 100 is further configured to: acquire a third test voltage of a test sub-pixel among a plurality of sub-pixels 201 under a reference data voltage; acquire a plurality of fourth test voltages of the first node S under different test data voltages; and acquire a correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node S based on a plurality of differences between the third test voltage and the fourth test voltage.

[0116] In this embodiment, the display device 100 is further configured to: acquire the input driving voltage of the plurality of sub-pixels 201 at the second node G, and the input data voltage of the data signal terminal Data of the plurality of sub-pixels 201; when the difference between the input driving voltage and the input data voltage is less than a first threshold, the sub-pixel 201 is a test sub-pixel.

[0117] In this embodiment, the display device 100 is further configured to: acquire the correlation curve between the data voltage of a plurality of test sub-pixels and the voltage offset of the first node S; and fit the correlation curve between the data voltage of the plurality of test sub-pixels and the voltage offset of the first node S to acquire the correlation curve between the data voltage of the display device 100 and the voltage offset of the first node S.

[0118] In this embodiment, the display device 100 is further configured to: acquire a first output voltage of the first node S; acquire a second output voltage of the first node S based on the first output voltage and the output voltage offset; and determine a target data voltage of the target sub-pixel based on the initial data voltage and the second output voltage.

[0119] In this embodiment, the display device 100 is further configured to: obtain an initial compensation coefficient of the initial data voltage; determine a compensation offset coefficient based on the initial data voltage and the voltage offset of the first node S; determine a target compensation coefficient of the initial data voltage based on the initial compensation coefficient and the compensation offset coefficient; and determine a target data voltage of the target sub-pixel based on the target compensation coefficient and the initial data voltage.

[0120] This application relates to a display device and a compensation method thereof. The pixel circuit of the display device includes a driving transistor and a light-emitting device, which are connected to a first node. The compensation method first obtains the initial data voltage of the target sub-pixel, obtains and determines the voltage offset of the first node based on the correlation curve between the data voltage and the voltage offset of the first node, and determines the target data voltage of the target sub-pixel based on the initial data voltage and the voltage offset of the first node. This application obtains the voltage offset of the first node based on the correlation curve between the data voltage and the voltage offset of the first node, and corrects the data voltage input to the target sub-pixel based on the voltage offset at that position. This eliminates the technical problem of deviation caused by the potential difference between the gate and source terminals of the driving transistor, and corrects the operating current flowing into the light-emitting device.

[0121] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0122] The display device and its compensation method provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A compensation method for a display device, characterized in that, The display device includes a plurality of sub-pixels having pixel circuits. Each pixel circuit includes a switching transistor, a driving transistor, and a light-emitting device. The first electrode of the driving transistor is connected to a first potential line, and the second electrode of the driving transistor and the anode of the light-emitting device are electrically connected to a first node. The first electrode of the switching transistor is connected to a data signal terminal, and the second electrode of the switching transistor and the gate of the driving transistor are electrically connected to a second node. The compensation method includes: Obtain the initial data voltage of the target sub-pixel; Obtain the correlation curve between the data voltage and the voltage offset of the first node; The voltage offset of the first node is determined based on the correlation curve between the data voltage and the voltage offset of the first node and the initial data voltage. The target data voltage of the target sub-pixel is determined based on the initial data voltage and the voltage offset of the first node; The target data voltage is input to the data signal terminal of the target sub-pixel.

2. The compensation method according to claim 1, characterized in that, The cathode of the light-emitting device is electrically connected to the second potential line, and the step of obtaining the correlation curve between the data voltage and the voltage offset of the first node includes: Obtain the first test voltage of the second potential line for one of the plurality of sub-pixels under the reference data voltage; Obtain multiple second test voltages of the second potential line for the test sub-pixel under different test data voltages; Based on multiple differences between the first test voltage and the second test voltage, obtain the correlation curve between the data voltage and the voltage offset of the second potential line; Based on the correlation curve between the data voltage and the voltage offset of the second potential line, and based on the correlation curve between the voltage offset of the second potential line and the voltage offset of the first node, the correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node is obtained. Based on the correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node, the correlation curve between the data voltage of the display device and the voltage offset of the first node is obtained.

3. The compensation method according to claim 1, characterized in that, The cathode of the light-emitting device is electrically connected to the second potential line, and the step of obtaining the correlation curve between the data voltage and the voltage offset of the first node includes: Obtain the third test voltage of the first node for one of the plurality of sub-pixels under the reference data voltage; Obtain multiple fourth test voltages of the first node under different test data voltages for the test sub-pixel; Based on multiple differences between the third test voltage and the fourth test voltage, obtain the correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node; Based on the correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node, the correlation curve between the data voltage of the display device and the voltage offset of the first node is obtained.

4. The compensation method according to claim 2 or 3, characterized in that, Before the step of obtaining the first test voltage of the second potential line for a test sub-pixel among the plurality of sub-pixels under the reference data voltage, the method further includes: The input driving voltage of the plurality of sub-pixels at the second node and the input data voltage of the data signal terminal of the plurality of sub-pixels are obtained; When the difference between the input driving voltage and the input data voltage is less than a first threshold, the sub-pixel is a test sub-pixel.

5. The compensation method according to claim 2 or 3, characterized in that, The step of obtaining the correlation curve between the data voltage of the display device and the voltage offset of the first node based on the correlation curve between the data voltage of the test sub-pixel and the voltage offset of the first node includes: Obtain the correlation curves between the data voltage of multiple test sub-pixels and the voltage offset of the first node; The correlation curves between the data voltage of the multiple test sub-pixels and the voltage offset of the first node are fitted to obtain the correlation curve between the data voltage of the display device and the voltage offset of the first node.

6. The compensation method according to claim 2 or 3, characterized in that, The test sub-pixel displays a grayscale of 0 under the reference data voltage, and the test sub-pixel displays a grayscale greater than 0 under different test data voltages.

7. The compensation method according to claim 1, characterized in that, The step of determining the target data voltage of the target sub-pixel based on the initial data voltage and the voltage offset of the first node includes: Obtain the first output voltage of the first node; Based on the first output voltage and the voltage offset of the first node, obtain the second output voltage of the first node; The target data voltage of the target sub-pixel is determined based on the initial data voltage and the second output voltage.

8. The compensation method according to claim 1, characterized in that, The step of determining the target data voltage of the target sub-pixel based on the initial data voltage and the voltage offset of the first node includes: Obtain the initial compensation coefficient of the initial data voltage; The compensation offset coefficient is determined based on the initial data voltage and the voltage offset of the first node; The target compensation coefficient for the initial data voltage is determined based on the initial compensation coefficient and the compensation offset coefficient. The target data voltage of the target sub-pixel is determined based on the target compensation coefficient and the initial data voltage.

9. A display device, characterized in that, The display device includes a display panel, which includes a plurality of sub-pixels having pixel circuits. Each pixel circuit includes a switching transistor, a driving transistor, and a light-emitting device. The first electrode of the driving transistor is connected to a first potential line, and the second electrode of the driving transistor and the anode of the light-emitting device are electrically connected to a first node. The first electrode of the switching transistor is connected to a data signal terminal, and the second electrode of the switching transistor and the gate of the driving transistor are electrically connected to a second node. The display device further includes: The data voltage module is used to acquire the initial data voltage of the target sub-pixel; The correlation curve module is used to obtain the correlation curve between the data voltage and the voltage offset of the first node; The offset voltage module determines the voltage offset of the first node based on the correlation curve between the data voltage and the voltage offset of the first node and the initial data voltage. The calculation module is used to determine the target data voltage of the target sub-pixel based on the initial data voltage and the voltage offset of the first node; A transmission module is used to input the target data voltage to the data signal terminal of the target sub-pixel.

10. The display device according to claim 9, characterized in that, The pixel circuit also includes: A detection device is connected to the cathode of the light-emitting device and the second potential line, and the detection device is used to acquire the potential of the second potential line.

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