Driving method of display panel and display panel

Abstract

The embodiment of the invention discloses a driving method of a display panel and the display panel, and the driving method comprises the steps: in a display stage, generating compensated data voltage according to a first compensation data lookup table or a second compensation data lookup table based on a display gray scale. Wherein the first compensation data lookup table is adopted under the high gray scale, the second compensation data lookup table is adopted under the low gray scale, and the first compensation data lookup table is different from the second compensation data lookup table. According to the scheme, different detection compensation algorithms are adopted at the high gray scale and the low gray scale, the problem that the detection effect is poor due to the fact that the current difference is too large during low-gray-scale detection can be avoided, accurate detection and compensation of the threshold voltage under the low gray scale can be achieved, and the display effect is improved.

Description

Technical Field

[0001] The 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 correspondingly, the requirements for display effects of display panels are getting higher and higher.

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

[0004] The 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 comprises a plurality of pixel circuits, wherein the pixel circuits comprise a driving transistor, and the driving transistor is used to drive a light-emitting element to emit light;

[0006] The driving method of the display panel includes:

[0007] In the display stage, based on the display gray scale, 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 a high gray scale, and the second compensation data lookup table is used at a low gray scale. 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 stage, 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 stage, based on the first compensation data lookup table, a second detection compensation algorithm is used 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 of each driving transistor at a high gray scale 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 the first compensation data lookup table;

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

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

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

[0018] After the first compensation data lookup table is formed, the current variation of each of the driving transistors 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 of the driving transistors is less than a first preset value, the updating of the first compensation data lookup table is stopped.

[0020] Optionally, the first compensation coefficient is obtained in a manner including:

[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 gray scale includes:

[0024] In the second threshold voltage detection stage, a second type of detection voltage is transmitted to the driving transistor, and a driving current of any driving transistor 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 gray scale;

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

[0026] Preferably, a grayscale among the multiple grayscales that is less than or equal to a preset grayscale 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 gray scale further includes:

[0028] After the second compensation data lookup table is formed, the current variation of each of the driving transistors 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 of the driving transistors is less than a second preset value, the updating of the first compensation data lookup table is stopped.

[0030] Optionally, the second compensation coefficient is obtained in a manner including:

[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 phase is located before the second threshold voltage detection phase, or is located within the second threshold voltage detection phase.

[0033] Optionally, in the display stage, based on the display grayscale, generating the compensated data voltage according to the first compensation data lookup table or the second compensation data lookup table 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] Generate 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 comprising a driving transistor, wherein the driving transistor is used to drive the light emitting element to emit light;

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

[0041] A compensation data generation module, used 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 stage;

[0042] The first compensation data lookup table is used at a high gray scale, and the second compensation data lookup table is used at a low gray scale. 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 comprises:

[0045] a compensation data search unit, configured to search the first compensation data lookup table or the second compensation data lookup table according to the display gray scale;

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

[0047] The technical solution provided by the embodiment of the present invention, by distinguishing high and low grayscales, adopts different detection compensation algorithms in stages to obtain corresponding compensation voltages to form different compensation data lookup tables. Among them, in the first threshold voltage detection stage, the first detection compensation algorithm is adopted to obtain the first compensation data lookup table of each driving transistor at high grayscale; in the second threshold voltage detection stage, based on the first compensation data lookup table, the second detection compensation algorithm is adopted to obtain the second compensation data lookup table of each driving transistor at low grayscale. This solution adopts different detection compensation algorithms for high and low grayscales, and uses the detection compensation data of high grayscale as the initial value of low grayscale detection after compensation, which can avoid the problem of poor detection effect caused by excessive current difference during low grayscale detection, and is conducive to realizing accurate detection and compensation of threshold voltage at low grayscale, thereby improving display effect.

[0048] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily 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 diagram of the structure of a display device provided by an embodiment of the present invention;

[0051] Figure 2 A schematic diagram of the structure 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 method for driving a display panel provided by an embodiment of the present invention;

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

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

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

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

[0058] Fig. 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 scheme of the present invention, the technical scheme 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 described embodiments 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 creative work should fall within the scope of protection of the present invention.

[0060] It should be noted that the terms "first", "second", etc. in the specification 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 data 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 that are 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 technology, the display panel in the prior art has poor compensation effect and uneven display. After careful study by the inventor, it is found that the reason for the above problems is that the organic light emitting diode (OLED) display panel uses organic materials to make light-emitting elements, uses thin film transistors to construct pixel circuits, and the pixel circuits are arranged in an array manner, and the display is performed by scanning and refreshing line by line. Some thin film transistors in the pixel circuit work in the linear region and act as switches. These transistors are also called switch transistors; some thin film transistors work in the saturation region and act as valves for voltage-controlled current. These transistors are also called drive transistors. In order to achieve high-quality image display, the pixel circuit needs to accurately perform grayscale compensation to avoid current differences between pixel circuits. However, the inventor found that in the actual display process, for different grayscales, the drive transistor does not always work in the saturation region. For example, at low grayscales, the drive transistor works 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 diagram of the structure of a display device provided by an embodiment of the present invention, Figure 2 A schematic diagram of the structure of another display device provided by an embodiment of the present invention, wherein: Figure 2 Specifically Figure 1 The partial 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 gray scale. 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. The initialization transistor Q3 is used to transmit the initialization voltage Vref to the first electrode of the light-emitting element D1 in response to the second scanning signal S2, so as to initialize the first electrode of the light-emitting element D1. The data writing transistor Q2 is used to transmit the data voltage to the gate of the driving transistor Q1 in response to the first scanning signal S1, and store it on the storage capacitor C. The driving transistor Q1 is used to drive the light-emitting element D1 to emit light.

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

[0064] In the display stage, based on the display grayscale, the 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.

[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, and is conducive to accurate detection and compensation of threshold voltage under low grayscale, thereby improving display effect.

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

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

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

[0069] Specifically, in 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, and then the detected threshold voltage is compensated to the data voltage, and the compensated data voltage is written to the driving transistor Q1. However, since the driving transistor Q1 is located in different working areas at high grayscale and low grayscale, the driving transistor Q1 is in the saturation area at high grayscale and in the subthreshold area at low grayscale, so at low grayscale, different threshold voltages cause the detected current difference to be too large, resulting in inaccurate detected threshold voltage.

[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 the high grayscale and the low grayscale is detected in two stages. In the first threshold voltage detection stage, the first detection compensation algorithm is used to obtain the first compensation data lookup table of the driving transistor Q1 at the high grayscale in each pixel circuit PX, wherein the first compensation data lookup table stores the compensation voltage corresponding to the driving transistor Q1 at the high grayscale, and the compensation voltage is associated with the threshold voltage of the driving transistor Q1. In the second threshold voltage detection stage, on the basis of using the first compensation data lookup table for compensation, the second detection compensation algorithm is used to obtain the second compensation data lookup table of the driving transistor Q1 at the low grayscale in each pixel circuit PX, wherein the second compensation data lookup table stores the compensation voltage corresponding to the driving transistor Q1 at the low grayscale, and the compensation voltage is 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 the same, or may be partially the same.

[0072] S130 . In a display stage, based on a display gray scale, generate a compensated data voltage according to a first compensation data lookup table or a second compensation data lookup table.

[0073] The technical solution provided by the embodiment of the present invention, by distinguishing high and low grayscales, adopts different detection compensation algorithms in stages to obtain corresponding compensation voltages to form different compensation data lookup tables. Among them, in the first threshold voltage detection stage, the first detection compensation algorithm is adopted to obtain the first compensation data lookup table of each driving transistor Q1 at high grayscale; in the second threshold voltage detection stage, based on the first compensation data lookup table, the second detection compensation algorithm is adopted to obtain the second compensation data lookup table of each driving transistor Q1 at low grayscale. This solution adopts different detection compensation algorithms for high and low grayscales, and uses the detection compensation data of high grayscale as the initial value of low grayscale detection after compensation, which can avoid the problem of poor detection effect caused by excessive current difference during low grayscale detection, and is conducive to realizing accurate detection and compensation of threshold voltage at low grayscale, thereby improving display effect.

[0074] Optionally, there is no need to perform threshold voltage detection before displaying each frame, which is beneficial for saving power consumption.

[0075] Figure 4 A schematic diagram of a flow chart of another display panel driving method provided by an embodiment of the present invention, referring to 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 a driving transistor, taking a driving current of any driving transistor as a reference current, and detecting current changes between the remaining driving transistors and the reference current.

[0077] Specifically, the grayscales greater than the preset grayscale in the displayed grayscale are classified as high grayscales. For example, grayscales greater than 32 are all high grayscales, and the first type of detection voltage is the data voltage corresponding to the high grayscale display. In the first threshold voltage detection stage, the first type of detection voltage is transmitted to the driving transistor Q1, so that the driving transistor Q1 can generate a corresponding driving current. The driving current of any pixel point is selected as the reference current, and the driving currents of the remaining pixel points are respectively subtracted from the reference current to obtain the current change of the driving transistor Q1 of each pixel point.

[0078] Optionally, the first type of detection voltage may include a tie point grayscale voltage, wherein the tie point grayscale is a specific grayscale value selected during the grayscale compensation process of the display panel and is 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 the first compensation coefficient to form a first compensation data lookup table.

[0080] Specifically, at a high gray scale, the driving transistor Q1 is in a 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] By substituting the current variation obtained in step S1101 into the current variation formula of the driving current in the saturation region, the threshold voltage variation of each driving transistor Q1, i.e., the first compensation voltage, can be obtained in turn, thereby forming a first compensation data lookup table.

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

[0089] S130 . In a display stage, based on a display gray scale, generate a compensated data voltage according to a first compensation data lookup table or a second compensation data lookup table.

[0090] The technical solution provided by the embodiment of the present invention, at high gray scale, 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 gray scale and improve the uniformity of the driving current of the driving transistor Q1 at high gray scale.

[0091] Figure 5 A schematic diagram of a flow chart of another display panel driving method provided by an embodiment of the present invention, referring to 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 a driving transistor, taking a driving current of any driving transistor as a reference current, and detecting current changes 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 the 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 with the first compensation coefficient, and iteratively updating the first compensation data lookup table.

[0095] Specifically, since each driving transistor Q1 uses the same first compensation coefficient a, the compensation effect is different for different driving transistors Q1. By repeatedly detecting the current change of each driving transistor Q1, combined with the first compensation coefficient a, optimizing the first compensation data lookup table (i.e., repeating steps S1101 and S1102, wherein the same first-class detection voltage as that used in the first detection can be used, or a different first-class detection voltage can be used), the compensation difference can be reduced and the 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 less than a first preset value, the updating of the first compensation data lookup table is stopped.

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

[0098] S130 . In a display stage, based on a display gray scale, generate a compensated data voltage according to a first compensation data lookup table or a second compensation data lookup table.

[0099] Optionally, in the present embodiment, the first compensation coefficient a can be obtained by detecting the driving current of the driving transistor Q1, according to multi-point or single-point calculation (in the case of multiple points, the average value can be used for equivalence), or 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, combined 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 acquired during the detection process.

[0101] Figure 6 A schematic diagram of a flow chart of another display panel driving method provided by an embodiment of the present invention, referring to 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 stage, using a first detection compensation algorithm to obtain a first compensation data lookup table of each of the driving transistors at a high gray scale.

[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 gray scale.

[0104] Specifically, the grayscales less than or equal to the preset grayscale in the display 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 the second type of detection voltage. Among them, the second type of detection voltage is a compensated voltage, specifically a voltage compensated by the compensation voltage in the first compensation data lookup table. In the second threshold voltage detection stage, the second type of detection voltage is transmitted to the driving transistor Q1, so that the driving transistor Q1 can generate a corresponding driving current. The driving current of any pixel point is selected as the reference current, and the driving currents of the remaining pixel points are respectively subtracted from the reference current to obtain the current change of the driving transistor Q1 of each pixel point.

[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] By substituting the current variation obtained in step S1201 into the current variation formula of the driving current in the subthreshold region, the threshold voltage variation of each driving transistor Q1, i.e., the second compensation voltage, can be obtained in turn, thereby forming a second compensation data lookup table.

[0114] S130 . In a display stage, based on a display gray scale, 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 gray scale as the initial value of low gray scale detection at low gray scale, 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 gray scale and improve the uniformity of the driving current of the driving transistor Q1 at low gray scale.

[0116] Figure 7 A schematic diagram of a flow chart of another display panel driving method provided by an embodiment of the present invention, referring to 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 stage, using a first detection compensation algorithm to obtain a first compensation data lookup table of each of the driving transistors at a high gray scale.

[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 gray scale.

[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 with the second compensation coefficient, and iteratively updating the second compensation data lookup table.

[0121] By repeatedly detecting the current variation of each driving transistor Q1 at low gray scales and combining the second compensation coefficient b to optimize the second compensation data lookup table, the compensation difference can be reduced and the compensation accuracy can be improved.

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

[0123] S130 . In a display stage, based on a display gray scale, 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, according to multi-point or single-point calculation (in the case of multiple points, the average value can be used for equivalence), or can be obtained by experimental means. 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 the 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 subthreshold current change formula, 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 acquired during the detection process.

[0128] Figure 8 A schematic diagram of a flow chart of another display panel driving method provided by an embodiment of the present invention, referring to 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 stage, using a first detection compensation algorithm to obtain a first compensation data lookup table of each driving transistor at a high gray scale.

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

[0131] S1301 . In a display stage, a first compensation data lookup table or a second compensation data lookup table is selected according to a display grayscale.

[0132] Specifically, in the display stage, the original image data transmitted by the system is used to determine whether the current grayscale displayed by the display panel is a high grayscale or a low grayscale. If the current grayscale displayed is a high grayscale, the first compensation data lookup table is selected as the compensation basis; if the current grayscale displayed is a low grayscale, the second compensation data lookup table is selected as the compensation basis.

[0133] S1302 , generating a compensated data voltage of 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, so as to realize external compensation and 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 may be selected according to actual conditions.

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

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

[0139] The threshold voltage detection module 210 is used to obtain a first compensation data lookup table of each driving transistor Q1 at a high grayscale by using a first detection compensation algorithm in a first threshold voltage detection stage, and to obtain a second compensation data lookup table of each driving transistor Q1 at a low grayscale by using a second detection compensation algorithm based on the first compensation data lookup table in a second threshold voltage detection stage;

[0140] The compensation data generation module 220 is used to generate a compensated data voltage according to a first compensation data lookup table or a second compensation data lookup table based on the display grayscale during the display stage. The first compensation data lookup table is used at a high grayscale, and the second compensation data lookup table is used at a low grayscale, and the first compensation data lookup table is different from the second compensation data lookup table.

[0141] The technical solution provided by the embodiment of the present invention, by distinguishing high and low grayscales, adopts different detection compensation algorithms in stages to obtain corresponding compensation voltages to form different compensation data lookup tables. Among them, in the first threshold voltage detection stage, the first detection compensation algorithm is adopted to obtain the first compensation data lookup table of each driving transistor Q1 at high grayscale; in the second threshold voltage detection stage, based on the first compensation data lookup table, the second detection compensation algorithm is adopted to obtain the second compensation data lookup table of each driving transistor Q1 at low grayscale. This solution adopts different detection compensation algorithms for high and low grayscales, and uses the detection compensation data of high grayscale as the initial value of low grayscale detection after compensation, which can avoid the problem of poor detection effect caused by excessive current difference during low grayscale detection, and is conducive to realizing accurate detection and compensation of threshold voltage at low grayscale, thereby improving display effect.

[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 Fig. 9 Optionally, the compensation data generating module 220 includes:

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

[0145] A compensation data search unit 2202, configured to search a first compensation data search table or a second compensation data search table according to a display gray scale;

[0146] The data generating unit 2203 is used 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 processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0149] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope 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 of which includes a driving transistor, and the driving transistor is used to drive a light-emitting element to emit light; The driving method of the display panel includes: In the display stage, based on the display gray scale, a compensated data voltage is generated according to the first compensation data lookup table or the second compensation data lookup table; The first compensation data lookup table is used at a high gray scale, and the second compensation data lookup table is used at a low gray scale. The first compensation data lookup table is different from the second compensation data lookup table.

2. The method for driving a display panel according to claim 1, wherein: Before the display stage, the driving method of the display panel further includes: In the first threshold voltage detection stage, 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 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 gray scale.

3. The method for driving a display panel according to claim 2, wherein: 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 gray scale 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 the first compensation data lookup table; Preferably, the first type of detection voltage includes a tie point grayscale voltage; Preferably, 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 gray scale, and the method further includes: After forming the first compensation data lookup table, detecting the current change of each driving transistor again, combining the first compensation coefficient, and iteratively updating the first compensation data lookup table; Preferably, when it is detected that the maximum value of the current variation of each of the driving transistors is less than a first preset value, the updating of the first compensation data lookup table is stopped.

5. The method for driving a display panel according to claim 3, wherein: 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; 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.

6. The method for driving a display panel according to claim 2, wherein: In the second threshold voltage detection stage, based on the first compensation data lookup table, using a second detection compensation algorithm to obtain the second compensation data lookup table of each driving transistor at a low gray scale includes: In the second threshold voltage detection stage, a second type of detection voltage is transmitted to the driving transistor, and a driving current of any driving transistor 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 gray scale; The second compensation voltage of each driving transistor is calculated according to the current variation and the second compensation coefficient to form the second compensation data lookup table; preferably, the grayscale less than or equal to the preset grayscale among the multiple grayscales is the low grayscale.

7. The method for driving a display panel according to claim 6, wherein: In the second threshold voltage detection stage, based on the first compensation data lookup table, the second detection compensation algorithm is used to obtain the second compensation data lookup table of each driving transistor at a low gray scale, and the second compensation data lookup table also includes: After forming the second compensation data lookup table, detecting the current change of each driving transistor again, combining the second compensation coefficient, and iteratively updating the second compensation data lookup table; Preferably, when it is detected that the maximum value of the current variation of each of the driving transistors is less than a second preset value, the updating of the second compensation data lookup table is stopped; Preferably, the second compensation coefficient is obtained in the following manner: 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; Preferably, 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.

8. 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 in the display stage 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; Generate the compensated data voltage of each driving transistor according to the first compensation data lookup table or the second compensation data lookup table; Preferably, in the display stage, the method for driving 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.

9. A display panel, characterized in that: include: A plurality of pixel circuits, each pixel circuit comprising a driving transistor, wherein the driving transistor is used to drive the light emitting element to emit light; A compensation data generation module, used 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 stage; The first compensation data lookup table is used at a high gray scale, and the second compensation data lookup table is used at a low gray scale. The first compensation data lookup table is different from the second compensation data lookup table.

10. The display panel according to claim 9, characterized in that: 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 of 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 of each driving transistor at a low grayscale based on the first compensation data lookup table in a second threshold voltage detection stage; Preferably, the compensation data generating module comprises: A grayscale determination unit, used to determine the display grayscale of the display panel; a compensation data search unit, configured to search the first compensation data lookup table or the second compensation data lookup table according to the display gray scale; The data generating unit is used to generate the compensated data voltage.

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