Display panel driving method and display panel

Abstract

An embodiment of the present invention discloses a method for driving a display panel and a display panel. The method includes: in a display phase, based on the display grayscale, generating a compensated data voltage according to a first compensation data lookup table or a second compensation data lookup table. The first compensation data lookup table is used at high grayscales, and the second compensation data lookup table is used at low grayscales, and the first compensation data lookup table and the second compensation data lookup table are different. This solution uses different detection compensation algorithms for high and low grayscales, which can avoid the problem of poor detection effect caused by excessive current difference during low grayscale detection, facilitates accurate detection and compensation of threshold voltage at low grayscales, and improves display effect.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a driving method of a display panel and a display panel. Background Art

[0002] With the development of display technology, display panels are used more and more widely, and accordingly, the requirements for the display effects of display panels are becoming higher and higher.

[0003] In the prior art, the display panel has the problem of poor display. Summary of the Invention

[0004] Embodiments of the present invention provide a display panel driving method and a display panel to improve the display effect of the display panel.

[0005] According to one aspect of the present invention, a method for driving a display panel is provided, wherein the display panel includes a plurality of pixel circuits, the pixel circuits include a driving transistor, and the driving transistor is used to drive a light-emitting element to emit light;

[0006] The display panel driving method includes:

[0007] In a display phase, based on a display grayscale, a compensated data voltage is generated according to the first compensation data lookup table or the second compensation data lookup table;

[0008] The first compensation data lookup table is used at high grayscale, and the second compensation data lookup table is used at low grayscale. The first compensation data lookup table is different from the second compensation data lookup table.

[0009] Optionally, before the display stage, the method for driving the display panel further includes:

[0010] In the first threshold voltage detection phase, a first detection compensation algorithm is used to obtain a first compensation data lookup table of each driving transistor at a high gray scale;

[0011] In the second threshold voltage detection phase, based on the first compensation data lookup table, a second detection compensation algorithm is adopted to obtain a second compensation data lookup table of each driving transistor at a low gray scale.

[0012] Optionally, in the first threshold voltage detection stage, using a first detection compensation algorithm to obtain a first compensation data lookup table for each driving transistor at a high grayscale includes:

[0013] In the first threshold voltage detection phase, a first type of detection voltage is transmitted to the driving transistor, a driving current of any driving transistor is used as a reference current, and a current change between the remaining driving transistors and the reference current is detected;

[0014] Calculating a first compensation voltage of each of the driving transistors according to the current variation and a first compensation coefficient to form a first compensation data lookup table;

[0015] Optionally, the first type of detection voltage includes a tie-point grayscale voltage;

[0016] Optionally, a grayscale greater than a preset grayscale among the multiple grayscales is the high grayscale.

[0017] Optionally, in the first threshold voltage detection stage, using the first detection compensation algorithm to obtain the first compensation data lookup table of each driving transistor at a high grayscale further includes:

[0018] After forming the first compensation data lookup table, the current variation of each driving transistor is detected again, and the first compensation data lookup table is iteratively updated in combination with the first compensation coefficient.

[0019] Optionally, when it is detected that the maximum value of the current variation of each driving transistor is smaller than a first preset value, updating of the first compensation data lookup table is stopped.

[0020] Optionally, a method for obtaining the first compensation coefficient includes:

[0021] detecting the driving current of the driving transistor under different first-type detection voltages, and calculating the first compensation coefficient according to a current formula in a saturation region;

[0022] Preferably, the first compensation coefficient acquisition stage is located before the first threshold voltage detection stage, or is located within the first threshold voltage detection stage.

[0023] Optionally, in the second threshold voltage detection stage, based on the first compensation data lookup table, using a second detection compensation algorithm to obtain a second compensation data lookup table for each driving transistor at a low grayscale includes:

[0024] In the second threshold voltage detection stage, a second type of detection voltage is transmitted to the driving transistor, and the driving current of any one of the driving transistors is used as a reference current to detect the current change between the remaining driving transistors and the reference current; wherein the second type of detection voltage is a voltage compensated by the compensation voltage in the first compensation data lookup table at a low grayscale;

[0025] Calculating a second compensation voltage of each of the driving transistors according to the current variation and the second compensation coefficient to form a second compensation data lookup table;

[0026] Preferably, a grayscale that is less than or equal to a preset grayscale among the multiple grayscales is the low grayscale.

[0027] Optionally, in the second threshold voltage detection stage, based on the first compensation data lookup table, using a second detection compensation algorithm to obtain a second compensation data lookup table for each driving transistor at a low grayscale further includes:

[0028] After the second compensation data lookup table is formed, the current variation of each driving transistor is detected again, and the second compensation data lookup table is iteratively updated in combination with the second compensation coefficient.

[0029] Optionally, when it is detected that the maximum value of the current variation of each driving transistor is smaller than a second preset value, updating of the first compensation data lookup table is stopped.

[0030] Optionally, a method for obtaining the second compensation coefficient includes:

[0031] detecting the driving current of the driving transistor under different second-type detection voltages, and calculating the second compensation coefficient according to a current formula in a subthreshold region;

[0032] Preferably, the second compensation coefficient acquisition stage is located before the second threshold voltage detection stage, or is located within the second threshold voltage detection stage.

[0033] Optionally, in the display stage, generating the compensated data voltage according to the first compensation data lookup table or the second compensation data lookup table based on the display grayscale includes:

[0034] In the display stage, determining to select the first compensation data lookup table or the second compensation data lookup table according to the display grayscale;

[0035] generating the compensated data voltage of each driving transistor according to the first compensation data lookup table or the second compensation data lookup table;

[0036] Preferably, in the display stage, the method for driving the display panel further includes:

[0037] The compensated data voltage is written into the driving transistor, and the driving transistor is controlled to drive the light emitting element to emit light.

[0038] According to another aspect of the present invention, there is provided a display panel, comprising:

[0039] a plurality of pixel circuits, each pixel circuit including a driving transistor configured to drive a light-emitting element to emit light;

[0040] a threshold voltage detection module, configured to, in a first threshold voltage detection phase, use a first detection and compensation algorithm to obtain a first compensation data lookup table for each of the driving transistors at a high grayscale; and, in a second threshold voltage detection phase, use a second detection and compensation algorithm based on the first compensation data lookup table to obtain a second compensation data lookup table for each of the driving transistors at a low grayscale;

[0041] A compensation data generation module, configured to generate a compensated data voltage according to a first compensation data lookup table or a second compensation data lookup table based on a display grayscale during a display phase;

[0042] The first compensation data lookup table is used at high grayscale, and the second compensation data lookup table is used at low grayscale. The first compensation data lookup table is different from the second compensation data lookup table.

[0043] Optionally, the compensation data generating module includes:

[0044] The compensation data generating module includes:

[0045] a compensation data lookup unit, configured to look up the first compensation data lookup table or the second compensation data lookup table according to the display grayscale;

[0046] The data generating unit is configured to generate the compensated data voltage.

[0047] The technical solution provided by an embodiment of the present invention distinguishes between high and low grayscales and uses different detection and compensation algorithms in stages to obtain corresponding compensation voltages to form different compensation data lookup tables. Specifically, in the first threshold voltage detection stage, a first detection and compensation algorithm is used to obtain a first compensation data lookup table for each driver transistor at high grayscale; in the second threshold voltage detection stage, a second detection and compensation algorithm is used based on the first compensation data lookup table to obtain a second compensation data lookup table for each driver transistor at low grayscale. This solution uses different detection and compensation algorithms for high and low grayscales, and uses the compensated detection compensation data for high grayscale as the initial value for low grayscale detection. This can avoid the problem of poor detection results caused by excessive current differences during low grayscale detection, facilitate accurate detection and compensation of threshold voltages at low grayscales, and improve display effects.

[0048] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0050] Figure 1 A schematic structural diagram of a display device provided by an embodiment of the present invention;

[0051] Figure 2 A schematic structural diagram of another display device provided by an embodiment of the present invention;

[0052] Figure 3 A schematic flow chart of a method for driving a display panel provided by an embodiment of the present invention;

[0053] Figure 4 A schematic flow chart of another display panel driving method provided by an embodiment of the present invention;

[0054] Figure 5 A schematic flow chart of another display panel driving method provided by an embodiment of the present invention;

[0055] Figure 6 A schematic flow chart of another display panel driving method provided by an embodiment of the present invention;

[0056] Figure 7 A schematic flow chart of another display panel driving method provided by an embodiment of the present invention;

[0057] Figure 8 A schematic flow chart of another display panel driving method provided by an embodiment of the present invention;

[0058] Figure 9 A schematic structural diagram of another display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0059] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0060] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0061] As described in the background art, display panels in the prior art suffer from poor compensation and uneven display. After careful research, the inventors discovered that the cause of these problems is that organic light-emitting diode (OLED) display panels use organic materials to make light-emitting elements and thin-film transistors to construct pixel circuits. The pixel circuits are arranged in an array, and display is performed using a row-by-row scanning and refreshing method. Some thin-film transistors in the pixel circuits operate in the linear region, acting as switches. These transistors are also called switching transistors; some thin-film transistors operate in the saturation region, acting as valves that control current through voltage. These transistors are also called driving transistors. To achieve high-quality image display, the pixel circuits need to accurately perform grayscale compensation to avoid current differences between pixel circuits. However, the inventors found that in actual display processes, the driving transistors do not always operate in the saturation region for different grayscales. For example, at low grayscales, the driving transistors operate in the subthreshold region, resulting in inaccurate threshold voltage detection, thereby reducing the compensation effect and affecting the display effect.

[0062] In view of the above problems, an embodiment of the present invention provides a method for driving a display panel to improve the compensation effect, thereby enhancing the display effect of the display panel. Figure 1 A schematic structural diagram of a display device provided by an embodiment of the present invention is shown in FIG. Figure 2 A schematic structural diagram of another display device provided by an embodiment of the present invention, wherein: Figure 2 Specifically Figure 1 The partially enlarged schematic diagram of the display device shown is shown in FIG. Figure 1 and Figure 2The display device includes a display panel 100, a display driver 200 and a gate driver 300. The display panel 100 includes a pixel circuit PX and a plurality of scan lines (GL1 to GLk) extending in the row direction, and a plurality of data lines Data (DL1 to DLj) extending in the column direction and crossing the scan signal lines. The gate driver 300 is used to output a scan signal to the pixel circuit PX through the scan line to turn on the pixel circuit PX. At this time, the pixel circuit PX can receive the data voltage output by the display driver 200 through the data line Data, so that the display panel 100 can display the corresponding grayscale. The pixel circuit PX can be Figure 2 The 3T1C structure shown includes a driving transistor Q1, a data writing transistor Q2, and an initialization transistor Q3. Initialization transistor Q3 is configured to conduct in response to a second scanning signal S2 and transmit an initialization voltage Vref to the first electrode of light-emitting element D1, thereby initializing the first electrode of light-emitting element D1. Data writing transistor Q2 is configured to conduct in response to a first scanning signal S1 and transmit a data voltage to the gate of driving transistor Q1, storing the data voltage on storage capacitor C. Driving transistor Q1 is configured to drive light-emitting element D1 to emit light.

[0063] The driving method of the display panel provided in this embodiment includes:

[0064] During the display phase, based on the display grayscale, a compensated data voltage is generated according to a first compensation data lookup table or a second compensation data lookup table. The first compensation data lookup table is used at high grayscales, while the second compensation data lookup table is used at low grayscales. The first compensation data lookup table and the second compensation data lookup table are different.

[0065] This solution uses different detection compensation algorithms for high and low grayscales, which can avoid the problem of poor detection effect caused by excessive current difference during low grayscale detection. It is conducive to achieving accurate detection and compensation of threshold voltage at low grayscale, thereby improving display effect.

[0066] Figure 3 A schematic diagram of a driving method for a display panel according to an embodiment of the present invention is provided. Figure 3 , the driving method of the display panel provided in this embodiment includes:

[0067] S110 , in a first threshold voltage detection phase, using a first detection compensation algorithm to obtain a first compensation data lookup table of each driving transistor at a high grayscale.

[0068] S120 , in the second threshold voltage detection phase, based on the first compensation data lookup table, a second detection compensation algorithm is used to obtain a second compensation data lookup table for each driving transistor at a low gray scale.

[0069] Specifically, during the external compensation process of the pixel circuit PX, the threshold voltage of the driving transistor Q1 in the pixel circuit PX is first detected, the detected threshold voltage is then compensated for in the data voltage, and the compensated data voltage is written into the driving transistor Q1. However, because the driving transistor Q1 operates in different regions at high and low grayscales, the driving transistor Q1 is in a saturation region at high grayscales and in a subthreshold region at low grayscales. Therefore, at low grayscales, the different threshold voltages result in excessively large differences in the detected current, which in turn leads to inaccurate detected threshold voltages.

[0070] In this embodiment, the display grayscale is divided into high grayscale and low grayscale, and the threshold voltage of the driving transistor Q1 at high grayscale and low grayscale is detected in two stages, respectively. In the first threshold voltage detection stage, a first detection and compensation algorithm is used to obtain a first compensation data lookup table for the driving transistor Q1 in each pixel circuit PX at high grayscale. The first compensation data lookup table stores compensation voltages corresponding to the driving transistor Q1 at high grayscale, and the compensation voltages are associated with the threshold voltage of the driving transistor Q1. In the second threshold voltage detection stage, based on compensation performed using the first compensation data lookup table, a second detection and compensation algorithm is used to obtain a second compensation data lookup table for the driving transistor Q1 in each pixel circuit PX at low grayscale. The second compensation data lookup table stores compensation voltages corresponding to the driving transistor Q1 at low grayscale, and the compensation voltages are associated with the threshold voltage of the driving transistor Q1.

[0071] Optionally, the compensation voltage in the first compensation data lookup table and the compensation voltage in the second compensation data lookup table may be the same, or may be identical, or partially identical.

[0072] S130 , in a display stage, generating a compensated data voltage according to a first compensation data lookup table or a second compensation data lookup table based on a display grayscale.

[0073] The technical solution provided by an embodiment of the present invention distinguishes between high and low grayscales and uses different detection and compensation algorithms in stages to obtain corresponding compensation voltages, thereby forming different compensation data lookup tables. Specifically, in the first threshold voltage detection stage, a first detection and compensation algorithm is used to obtain a first compensation data lookup table for each driver transistor Q1 at high grayscale; in the second threshold voltage detection stage, a second detection and compensation algorithm is used based on the first compensation data lookup table to obtain a second compensation data lookup table for each driver transistor Q1 at low grayscale. This solution uses different detection and compensation algorithms for high and low grayscales, and uses the compensated detection compensation data for high grayscale as the initial value for low grayscale detection. This can avoid the problem of poor detection results caused by excessive current differences during low grayscale detection, facilitate accurate detection and compensation of threshold voltages at low grayscales, and improve display effects.

[0074] Optionally, it is not necessary to perform threshold voltage detection before displaying each frame, which is beneficial to saving power consumption.

[0075] Figure 4 A flow chart of another method for driving a display panel according to an embodiment of the present invention is provided. Figure 4 Based on the above embodiment, optionally, the driving method of the display panel provided in this embodiment includes:

[0076] S1101 , in a first threshold voltage detection phase, transmitting a first type of detection voltage to the driving transistor, taking the driving current of any driving transistor as a reference current, and detecting the current variation between the remaining driving transistors and the reference current.

[0077] Specifically, grayscales greater than a preset grayscale are classified as high grayscales. For example, grayscales greater than 32 are all high grayscales. The first-type detection voltage is the data voltage corresponding to the high grayscale display. During the first threshold voltage detection phase, the first-type detection voltage is transmitted to the driving transistor Q1, causing the driving transistor Q1 to generate a corresponding driving current. The driving current of any pixel is selected as a reference current, and the driving current of each of the remaining pixels is subtracted from the reference current to obtain the current change of the driving transistor Q1 of each pixel.

[0078] Optionally, the first type of detection voltage may include a tie-point grayscale voltage. The tie-point grayscale is a specific grayscale value selected during the grayscale compensation process of the display panel and used as a reference point or control point for related calculations and adjustments. The tie-point grayscale voltage is the voltage value corresponding to the tie-point grayscale.

[0079] S1102 , calculating a first compensation voltage of each driving transistor according to the current variation and a first compensation coefficient to form a first compensation data lookup table.

[0080] Specifically, at high grayscale, the driving transistor Q1 is in the saturation region, and the driving current generated by the driving transistor Q1 is expressed as follows:

[0081]

[0082] Where, I is the driving current, μ is the electron mobility of the driving transistor Q1, Cox is the channel capacitance per unit area of ​​the driving transistor Q1, W / L is the width-to-length ratio of the driving transistor Q1, Vth is the threshold voltage of the driving transistor Q1, V GS is the gate-source voltage difference of the driving transistor Q1.

[0083] Taking the square root of the above formula, we get:

[0084]

[0085] Then, the current change of the driving current is:

[0086]

[0087] Where a is the first compensation coefficient. By substituting the current change obtained in step S1101 into the formula for the current change of the driving current in the saturation region, the change value of the threshold voltage of each driving transistor Q1 can be obtained in sequence, that is, the first compensation voltage, thereby forming a first compensation data lookup table.

[0088] S120 , in the second threshold voltage detection phase, based on the first compensation data lookup table, a second detection compensation algorithm is used to obtain a second compensation data lookup table for each driving transistor at a low gray scale.

[0089] S130 , in a display stage, generating a compensated data voltage according to a first compensation data lookup table or a second compensation data lookup table based on a display grayscale.

[0090] The technical solution provided by the embodiment of the present invention, at high grayscale, detects the change between the driving current and the reference current of different driving transistors Q1, and calculates the first compensation voltage of each driving transistor Q1 in combination with the current formula of the driving transistor Q1 in the saturation region, so as to compensate for the characteristic difference of the convergent driving transistor Q1 at high grayscale and improve the uniformity of the driving current of the driving transistor Q1 at high grayscale.

[0091] Figure 5 A flow chart of another method for driving a display panel according to an embodiment of the present invention is provided. Figure 5 Based on the above embodiment, optionally, the driving method of the display panel provided in this embodiment includes:

[0092] S1101 , in a first threshold voltage detection phase, transmitting a first type of detection voltage to the driving transistor, taking the driving current of any driving transistor as a reference current, and detecting the current variation between the remaining driving transistors and the reference current.

[0093] S1102 , calculating a first compensation voltage of each driving transistor according to the current variation and a first compensation coefficient to form a first compensation data lookup table.

[0094] S1103 , after forming the first compensation data lookup table, detecting the current variation of each driving transistor again, combining the first compensation coefficient, and iteratively updating the first compensation data lookup table.

[0095] Specifically, because each driving transistor Q1 uses the same first compensation coefficient a, the compensation effect varies for different driving transistors Q1. By repeatedly detecting the current change of each driving transistor Q1 and optimizing the first compensation data lookup table in combination with the first compensation coefficient a (i.e., repeating steps S1101 and S1102, where the same first-type detection voltage as used in the first detection can be used, or a different first-type detection voltage can be used), compensation differences can be reduced and compensation accuracy can be improved.

[0096] Optionally, when it is detected that the maximum value of the current variation of each driving transistor Q1 is smaller than a first preset value, the updating of the first compensation data lookup table is stopped.

[0097] S120 , in the second threshold voltage detection phase, based on the first compensation data lookup table, a second detection compensation algorithm is used to obtain a second compensation data lookup table for each driving transistor at a low gray scale.

[0098] S130 , in a display stage, generating a compensated data voltage according to a first compensation data lookup table or a second compensation data lookup table based on a display grayscale.

[0099] Optionally, in this embodiment, the first compensation coefficient a can be obtained by detecting the driving current of the driving transistor Q1 and calculating based on multiple points or a single point (in the case of multiple points, the average value can be used for equivalence), or it can be obtained by experimental means. Exemplarily, the first compensation coefficient a is obtained as follows: the driving current of the driving transistor Q1 is detected under different first-type detection voltages, and the first compensation coefficient a is calculated according to the current formula in the saturation region. For example, multiple binding point grayscale voltages are selected. For the same pixel point, according to the saturation region current formula, each binding point voltage corresponds to a driving current. By detecting the driving current of the driving transistor Q1 under different binding point grayscale voltages and combining it with the above-mentioned current change formula, the first compensation coefficient a can be obtained.

[0100] Optionally, the acquisition stage of the first compensation coefficient a can be located before the first threshold voltage detection stage, for example, the first compensation coefficient is stored at the factory and can be directly called in the first threshold detection stage; it can also be located in the first threshold voltage detection stage, and the first compensation coefficient a is obtained during the detection process.

[0101] Figure 6 A flow chart of another method for driving a display panel according to an embodiment of the present invention is provided. Figure 6 Based on the above embodiments, optionally, the driving method of the display panel provided in this embodiment includes:

[0102] S110 , in a first threshold voltage detection phase, using a first detection compensation algorithm to obtain a first compensation data lookup table of each driving transistor at a high grayscale.

[0103] S1201. In the second threshold voltage detection stage, a second type of detection voltage is transmitted to the driving transistor, and the driving current of any driving transistor is used as the reference current to detect the current change between the remaining driving transistors and the reference current; wherein the second type of detection voltage is a voltage compensated by the compensation voltage in the first compensation data lookup table at a low grayscale.

[0104] Specifically, grayscales less than or equal to a preset grayscale in the displayed grayscale are classified as low grayscales. For example, grayscales less than or equal to 32 are all low grayscales, and the data voltage corresponding to the low grayscale display is a second-type detection voltage. The second-type detection voltage is a compensated voltage, specifically a voltage compensated by the compensation voltage in the first compensation data lookup table. During the second threshold voltage detection phase, the second-type detection voltage is transmitted to the drive transistor Q1, causing the drive transistor Q1 to generate a corresponding drive current. The drive current of any pixel is selected as a reference current, and the difference between the drive current of each pixel and the reference current is calculated to obtain the current change of the drive transistor Q1 of each pixel.

[0105] S1202 , calculating a second compensation voltage of each driving transistor according to the current variation and the second compensation coefficient to form a second compensation data lookup table.

[0106] Specifically, at low grayscale, the driving transistor Q1 is in the subthreshold region, and the driving current generated by the driving transistor Q1 is expressed as follows:

[0107]

[0108] Where I is the driving current, I0 is the cut-off current, n is the modulation coefficient, kT is the thermal pressure equivalent, Vth is the threshold voltage of the driving transistor Q1, V GS is the gate-source voltage difference of the driving transistor Q1.

[0109] Taking the logarithm of the above formula, we get:

[0110]

[0111] Then, the current change of the driving current is:

[0112]

[0113] Wherein, b is the second compensation coefficient. By substituting the current change obtained in step S1201 into the above formula for the current change of the driving current in the subthreshold region, the change value of the threshold voltage of each driving transistor Q1 can be obtained in turn, i.e., the second compensation voltage, thereby forming a second compensation data lookup table.

[0114] S130 . In a display stage, based on a display grayscale, generate a compensated data voltage according to the first compensation data lookup table or the second compensation data lookup table.

[0115] The technical solution provided by the embodiment of the present invention uses the voltage compensated by the first compensation data lookup table at high grayscale as the initial value for low grayscale detection at low grayscale, detects the change between the driving current of different driving transistors Q1 and the reference current, and calculates the second compensation voltage of each driving transistor Q1 in combination with the current formula of the driving transistor Q1 in the subthreshold region to converge the driving current detected at low grayscale and improve the uniformity of the driving current of the driving transistor Q1 at low grayscale.

[0116] Figure 7 A flow chart of another method for driving a display panel according to an embodiment of the present invention is provided. Figure 7 Based on the above embodiment, optionally, the driving method of the display panel provided in this embodiment includes:

[0117] S110 , in a first threshold voltage detection phase, using a first detection compensation algorithm to obtain a first compensation data lookup table of each driving transistor at a high grayscale.

[0118] S1201. In the second threshold voltage detection stage, a second type of detection voltage is transmitted to the driving transistor, and the driving current of any driving transistor is used as the reference current to detect the current change between the remaining driving transistors and the reference current; wherein the second type of detection voltage is a voltage compensated by the compensation voltage in the first compensation data lookup table at a low grayscale.

[0119] S1202 , calculating a second compensation voltage of each driving transistor according to the current variation and the second compensation coefficient to form a second compensation data lookup table.

[0120] S1203 , after forming the second compensation data lookup table, detecting the current variation of each driving transistor again, combining the second compensation coefficient, and iteratively updating the second compensation data lookup table.

[0121] The second compensation data lookup table is optimized by repeatedly detecting the current variation of each driving transistor Q1 at low grayscales and combining the second compensation coefficient b, thereby reducing compensation differences and improving compensation accuracy.

[0122] Optionally, when it is detected that the maximum value of the current variation of each driving transistor Q1 is smaller than a second preset value, the updating of the second compensation data lookup table is stopped.

[0123] S130 . In a display stage, based on a display grayscale, generate a compensated data voltage according to the first compensation data lookup table or the second compensation data lookup table.

[0124] Optionally, in this embodiment, the second compensation coefficient b can be obtained by detecting multiple low grayscale driving currents and calculating based on multiple points or a single point (in the case of multiple points, the average value can be used for equivalence), or can be obtained by experiment. Exemplarily, the second compensation coefficient is obtained by:

[0125] The driving current of the driving transistor Q1 under different second-type detection voltages is detected, and a second compensation coefficient b is calculated according to a current formula in the subthreshold region.

[0126] Among them, for the same pixel point, according to the subthreshold current formula, each binding point grayscale voltage corresponds to a driving current. By detecting the driving current of the driving transistor Q1 under different second-type detection voltages (the second-type detection voltage can be the corresponding compensated binding point grayscale voltage), combined with the above-mentioned formula for the current change in the subthreshold region, the second compensation coefficient b can be obtained.

[0127] Optionally, the acquisition stage of the second compensation coefficient b can be located before the second threshold voltage detection stage, for example, the second compensation coefficient b is stored at the factory and can be directly called in the second threshold detection stage; it can also be located in the second threshold voltage detection stage, and the second compensation coefficient b is obtained during the detection process.

[0128] Figure 8 A flow chart of another method for driving a display panel according to an embodiment of the present invention is provided. Figure 8 Based on the above embodiments, optionally, the driving method of the display panel provided in this embodiment includes:

[0129] S110 , in a first threshold voltage detection phase, using a first detection compensation algorithm to obtain a first compensation data lookup table of each driving transistor at a high grayscale.

[0130] S120 , in the second threshold voltage detection phase, based on the first compensation data lookup table, a second detection compensation algorithm is used to obtain a second compensation data lookup table for each driving transistor at a low gray scale.

[0131] S1301 : In a display stage, determining whether to select a first compensation data lookup table or a second compensation data lookup table according to a display grayscale.

[0132] Specifically, during the display phase, the system determines whether the current grayscale displayed by the display panel is high or low based on the original image data transmitted. If the current grayscale is high, the first compensation data lookup table is selected as the compensation basis; if the current grayscale is low, the second compensation data lookup table is selected as the compensation basis.

[0133] S1302 : Generate compensated data voltages for each driving transistor according to the first compensation data lookup table or the second compensation data lookup table.

[0134] The compensated data voltage is generated according to the selected first compensation data lookup table or the second compensation data lookup table, that is, the generated data voltage includes the threshold voltage of the driving transistor Q1, thereby achieving external compensation to optimize the display effect.

[0135] S1303 , writing the compensated data voltage into the driving transistor, and controlling the driving transistor to drive the light-emitting element to emit light.

[0136] Optionally, in other embodiments, the high grayscale and the low grayscale may also use the same compensation data lookup table, for example, both use the first compensation data lookup table or both use the second compensation data lookup table, which can be selected according to actual conditions.

[0137] Optionally, an embodiment of the present invention further provides a display panel, which can be driven by the display panel driving method provided by any embodiment of the present invention. Figure 9 A schematic diagram of another display device according to an embodiment of the present invention is provided. Figure 1 and Figure 9 , the display panel provided in this embodiment includes:

[0138] A plurality of pixel circuits PX, each pixel circuit PX including a driving transistor Q1, wherein the driving transistor Q1 is used to drive the light-emitting element D1 to emit light;

[0139] The threshold voltage detection module 210 is configured to, during a first threshold voltage detection phase, use a first detection and compensation algorithm to obtain a first compensation data lookup table for each driving transistor Q1 at a high grayscale, and, during a second threshold voltage detection phase, use a second detection and compensation algorithm based on the first compensation data lookup table to obtain a second compensation data lookup table for each driving transistor Q1 at a low grayscale;

[0140] The compensation data generation module 220 is configured to generate compensated data voltages based on the display grayscale during the display phase using a first compensation data lookup table or a second compensation data lookup table. The first compensation data lookup table is used at high grayscales, while the second compensation data lookup table is used at low grayscales. The first compensation data lookup table and the second compensation data lookup table are different.

[0141] The technical solution provided by an embodiment of the present invention distinguishes between high and low grayscales and uses different detection and compensation algorithms in stages to obtain corresponding compensation voltages, thereby forming different compensation data lookup tables. Specifically, in the first threshold voltage detection stage, a first detection and compensation algorithm is used to obtain a first compensation data lookup table for each driver transistor Q1 at high grayscale; in the second threshold voltage detection stage, a second detection and compensation algorithm is used based on the first compensation data lookup table to obtain a second compensation data lookup table for each driver transistor Q1 at low grayscale. This solution uses different detection and compensation algorithms for high and low grayscales, and uses the compensated detection compensation data for high grayscale as the initial value for low grayscale detection. This can avoid the problem of poor detection results caused by excessive current differences during low grayscale detection, facilitate accurate detection and compensation of threshold voltages at low grayscales, and improve display effects.

[0142] Optionally, the compensation data generating module 220 and the threshold voltage detecting module 210 may be integrated into the display driver 200 .

[0143] Continue to refer Figure 9 Optionally, the compensation data generating module 220 includes:

[0144] Grayscale determination unit 2201, used to determine the display grayscale of the display panel;

[0145] The compensation data search unit 2202 is configured to search the first compensation data lookup table or the second compensation data lookup table according to the display grayscale;

[0146] The data generating unit 2203 is configured to generate a compensated data voltage.

[0147] The specific working process of the compensation data generating module 220 can refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0148] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0149] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for driving a display panel, characterized in that: The display panel includes a plurality of pixel circuits, each pixel circuit includes a driving transistor, and the driving transistor is used to drive a light-emitting element to emit light; The display panel driving method includes: In the display stage, based on the display grayscale, a compensated data voltage is generated according to the first compensation data lookup table or the second compensation data lookup table; Wherein, the first compensation data lookup table is used at high grayscale, and the second compensation data lookup table is used at low grayscale, and the first compensation data lookup table is different from the second compensation data lookup table; Before the display stage, the display panel driving method further includes: In the first threshold voltage detection phase, a first detection compensation algorithm is used to obtain the first compensation data lookup table of each driving transistor at a high gray scale; In the second threshold voltage detection phase, based on the first compensation data lookup table, a second detection compensation algorithm is used to obtain the second compensation data lookup table of each driving transistor at a low gray scale; In the first threshold voltage detection phase, using the first detection compensation algorithm to obtain the first compensation data lookup table of each driving transistor at a high grayscale includes: In the first threshold voltage detection phase, a first type of detection voltage is transmitted to the driving transistor, a driving current of any driving transistor is used as a reference current, and a current change between the remaining driving transistors and the reference current is detected; Calculating a first compensation voltage of each of the driving transistors according to the current variation and a first compensation coefficient to form a first compensation data lookup table; The current variation of the driving current is: Wherein, a is the first compensation coefficient; The method for obtaining the first compensation coefficient includes: detecting the driving current of the driving transistor under different first-type detection voltages, and calculating the first compensation coefficient according to a current formula in a saturation region; In the second threshold voltage detection phase, based on the first compensation data lookup table, a second detection compensation algorithm is used to obtain the second compensation data lookup table of each driving transistor at a low grayscale, including: In the second threshold voltage detection stage, a second type of detection voltage is transmitted to the driving transistor, and the driving current of any one of the driving transistors is used as a reference current to detect the current change between the remaining driving transistors and the reference current; wherein the second type of detection voltage is a voltage compensated by the compensation voltage in the first compensation data lookup table at a low grayscale; Calculating a second compensation voltage of each of the driving transistors according to the current variation and the second compensation coefficient to form a second compensation data lookup table; The current variation of the driving current is: Wherein, b is the second compensation coefficient; The second compensation coefficient is obtained by: The driving current of the driving transistor under different second-type detection voltages is detected, and the second compensation coefficient is calculated according to a current formula in a subthreshold region.

2. The method for driving a display panel according to claim 1, wherein: The first type of detection voltage includes a tie-dot grayscale voltage.

3. The method for driving a display panel according to claim 1, wherein: A grayscale greater than a preset grayscale among the multiple grayscales is the high grayscale.

4. The method for driving a display panel according to claim 3, wherein: In the first threshold voltage detection stage, the first detection compensation algorithm is used to obtain the first compensation data lookup table of each driving transistor at a high grayscale, further comprising: After forming the first compensation data lookup table, the current variation of each driving transistor is detected again, and the first compensation data lookup table is iteratively updated in combination with the first compensation coefficient.

5. The method for driving a display panel according to claim 4, wherein: When it is detected that the maximum value of the current variation of each driving transistor is smaller than a first preset value, updating the first compensation data lookup table is stopped.

6. The method for driving a display panel according to claim 3, wherein: The first compensation coefficient acquisition phase is located before the first threshold voltage detection phase, or is located within the first threshold voltage detection phase.

7. The method for driving a display panel according to claim 1, wherein: A grayscale that is less than or equal to a preset grayscale among the multiple grayscales is the low grayscale.

8. The method for driving a display panel according to claim 7, wherein: In the second threshold voltage detection stage, based on the first compensation data lookup table, a second detection compensation algorithm is used to obtain the second compensation data lookup table of each driving transistor at a low grayscale, further comprising: After the second compensation data lookup table is formed, the current variation of each driving transistor is detected again, and the second compensation data lookup table is iteratively updated in combination with the second compensation coefficient.

9. The method for driving a display panel according to claim 8, wherein: When it is detected that the maximum value of the current variation of each driving transistor is smaller than a second preset value, updating the second compensation data lookup table is stopped.

10. The method for driving a display panel according to claim 9, wherein: The second compensation coefficient acquisition phase is located before the second threshold voltage detection phase, or is located within the second threshold voltage detection phase.

11. The method for driving a display panel according to claim 1, wherein: The step of generating the compensated data voltage according to the first compensation data lookup table or the second compensation data lookup table based on the display grayscale during the display phase includes: In the display stage, determining to select the first compensation data lookup table or the second compensation data lookup table according to the display grayscale; The compensated data voltage of each driving transistor is generated according to the first compensation data lookup table or the second compensation data lookup table.

12. The method for driving a display panel according to claim 11, wherein: In the display stage, the driving method of the display panel further includes: The compensated data voltage is written into the driving transistor, and the driving transistor is controlled to drive the light emitting element to emit light.

13. A display panel controlled by the display panel driving method according to any one of claims 1 to 12, characterized in that: include: a plurality of pixel circuits, each pixel circuit including a driving transistor configured to drive a light-emitting element to emit light; A compensation data generation module, configured to generate a compensated data voltage according to a first compensation data lookup table or a second compensation data lookup table based on a display grayscale during a display phase; The first compensation data lookup table is used at high grayscale, and the second compensation data lookup table is used at low grayscale. The first compensation data lookup table is different from the second compensation data lookup table.

14. The display panel according to claim 13, wherein: It also includes a threshold voltage detection module, which is used to use a first detection compensation algorithm to obtain a first compensation data lookup table for each driving transistor at a high grayscale in a first threshold voltage detection stage, and to use a second detection compensation algorithm to obtain a second compensation data lookup table for each driving transistor at a low grayscale based on the first compensation data lookup table in a second threshold voltage detection stage.

15. The display panel according to claim 14, wherein: The compensation data generating module includes: a grayscale determination unit, configured to determine a display grayscale of the display panel; a compensation data lookup unit, configured to look up the first compensation data lookup table or the second compensation data lookup table according to the display grayscale; The data generating unit is configured to generate the compensated data voltage.

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