Driving compensation method of display device and display device

Abstract

The application discloses a display device driving compensation method and a display device. The display device comprises a driving system and a display panel connected with the driving system. The method comprises the following steps: acquiring image data to be displayed by the display panel; acquiring a preset compensation table corresponding to an impedance change type of a fan-out area of the display panel according to the image data to be displayed, wherein the preset compensation table comprises a preset gray scale value, gray scale compensation data and a mapping relationship between data lines corresponding to preset position nodes; determining target gray scale compensation data corresponding to a target data line for displaying the image data according to the image data and the preset compensation table; and driving display according to the target gray scale compensation data. The application effectively eliminates Mura and improves the display effect of the display panel.

Description

Technical Field

[0001] This application relates to the field of display panel driving technology, and specifically to a driving compensation method and a display device. Background Technology

[0002] In a display panel, pixel units within the active area (AA) are arranged in a matrix array on an array substrate. The signal output terminals of the integrated circuit (IC) located in the non-display area transmit voltage to the pixel units within the active area via signal lines. Since the IC includes several signal output terminals, each terminal needs to be connected to the signal lines within the active area via data lines. Consequently, these data lines are arranged in a fan-shaped pattern in the non-display area. Therefore, the region where these data lines are arranged in a fan-shaped pattern in the non-display area is called the fan-out area.

[0003] However, as Figure 1 As shown, due to the difference in distance between the data lines at different column positions and the data driver, the data lines located on the left and right sides of the fan-out area (i.e., the far-end data lines in the area farther from the data driver) are longer than the data lines located in the middle of the fan-out area (i.e., the near-end data lines in the area closest to the data driver). This results in an impedance difference between the lines. Therefore, the impedance of the data lines on the left and right sides of the fan-out area is greater than that of the data lines in the middle of the fan-out area, causing different levels of RC delay for each data line. Figure 2 The diagram illustrates the variation in data line impedance at different locations, which can potentially lead to defects such as block mura (where mura refers to uneven display brightness) in the vertical and / or horizontal directions. Therefore, how to compensate for impedance variations and eliminate mura is a technical problem urgently needing to be solved by those skilled in the art. Summary of the Invention

[0004] This application provides a driving compensation method and a display device to solve the technical problem of display screen malfunction caused by inconsistent resistance and capacitance delay of data lines.

[0005] In a first aspect, this application provides a driving compensation method for a display device, the display device including a driving system and a display panel connected to the driving system, the method comprising:

[0006] Obtain the image data to be displayed on the display panel;

[0007] Based on the image data to be displayed, a preset compensation table corresponding to the impedance change type of the fan-out area of ​​the display panel is obtained, wherein the preset compensation table includes the mapping relationship between preset grayscale values, grayscale compensation data and data lines corresponding to preset position nodes;

[0008] According to the image data and the preset compensation table, target gray scale compensation data corresponding to a target data line displaying the image data is determined;

[0009] According to the target gray scale compensation data, driving display is performed.

[0010] In some embodiments, before the preset compensation table corresponding to the impedance variation type of the fan-out area of the display panel is obtained according to the image data to be displayed, the method further comprises:

[0011] A voltage compensation coefficient between a first data line and a second data line of the display panel is obtained, the first data line being the data line closest to the driving system in the display panel, and the second data line being the remaining data line except the first data line in the display panel;

[0012] The preset compensation table corresponding to the voltage compensation coefficient is created.

[0013] In some embodiments, the voltage compensation coefficient between the first data line and the second data line is obtained by:

[0014] A first preset gray scale voltage of the first data line and a second preset gray scale voltage of the second data line are obtained, the second preset gray scale voltage being greater than the first preset gray scale voltage;

[0015] The voltage compensation coefficient is calculated according to the first preset gray scale voltage and the second preset gray scale voltage.

[0016] In some embodiments, the first preset gray scale voltage of the first data line and the second preset gray scale voltage of the second data line are obtained by:

[0017] A first delay time constant of the first data line and a second delay time constant of the second data line are obtained, the second delay time constant being greater than the first delay time constant;

[0018] A natural constant, a first output voltage provided by the driving system to the first data line, a second output voltage provided by the data driver to the second data line, a first charging time of the first data line, and a second charging time of the second data line are obtained;

[0019] divide the first charging time by the first delay time constant to obtain a first result, calculate a first power operation result according to a result of taking a negative of the first result as an exponent and the natural constant as a base number, and obtain the first preset gray scale voltage corresponding to the first data line according to a product of a difference between a preset constant and the first power operation result and the first output voltage;

[0020] divide the second charging time by the second delay time constant to obtain a second result, calculate a second power operation result according to a result of taking a negative of the second result as an exponent and the natural constant as a base number, and obtain the second preset gray scale voltage corresponding to the second data line according to a product of a difference between a preset constant and the second power operation result and the second output voltage.

[0021] In some embodiments, the calculating the corresponding voltage compensation coefficient according to the first preset gray scale voltage and the second preset gray scale voltage comprises:

[0022] setting the first preset gray scale voltage of the first data line to be equal to the second preset gray scale voltage of any second data line, so that the charging voltage difference between the first data line and the second data line is eliminated;

[0023] dividing the first preset gray scale voltage by the second preset gray scale voltage to obtain the voltage compensation coefficient of the second data line relative to the first data line.

[0024] In some embodiments, the creating the preset compensation table according to the voltage compensation coefficient comprises:

[0025] obtaining a first relationship curve of a third data line of the display panel, the third data line being the second data line farthest from the driving system, the first relationship curve comprising a mapping relationship between a plurality of first gray scale values and a plurality of first gamma voltages;

[0026] obtaining a second relationship curve of the first data line and a second relationship curve of the second data line, the second relationship curve comprising a mapping relationship between a plurality of second gray scale values and a plurality of second gamma voltages;

[0027] obtaining gray scale compensation data corresponding to the first data line and the second data line according to the voltage compensation coefficient, the first relationship curve and the second relationship curve;

[0028] obtaining the preset compensation table according to a mapping relationship between a data line position, a plurality of second gray scale values and the gray scale compensation data.

[0029] In some embodiments, the obtaining the gray scale compensation data corresponding to the first data line and the second data line according to the voltage compensation coefficient, the first relationship curve and the second relationship curve comprises:

[0030] obtaining a first gamma voltage corresponding to the first gray scale value in the first relationship curve;

[0031] obtaining a voltage compensation coefficient corresponding to the first relationship curve and the second relationship curve;

[0032] obtaining a second gamma voltage corresponding to the first gamma voltage multiplied by the voltage compensation coefficient;

[0033] finding a second gray scale value corresponding to the second gamma voltage from the first relationship curve, the second gray scale value being less than the first gray scale value;

[0034] performing difference calculation on the first gray scale value and the second gray scale value to obtain the gray scale compensation data corresponding to the first data line and the second data line.

[0035] In some embodiments, the determining the target gray scale compensation data corresponding to the target data line displaying the image data according to the image data and the preset compensation table comprises:

[0036] obtaining position data and a target gray scale value by analyzing the image data;

[0037] determining the target data line displaying the image data according to the position data;

[0038] if the target data line does not belong to the data line farthest from the data driver, querying the preset compensation table according to the target data line and the target gray scale value to obtain the target gray scale compensation data corresponding thereto.

[0039] In a second aspect, the present application further provides a display device, comprising a driving system and a display panel connected with the driving system, wherein the driving system comprises:

[0040] a memory storing a preset compensation table and image data to be displayed, wherein the preset compensation table comprises a mapping relationship between a preset gray scale value, a gray scale compensation data and a data line corresponding to a preset position node;

[0041] a timing controller configured to obtain a preset compensation table corresponding to a type of impedance variation of a fan-out area of the display panel according to the image data to be displayed, and determine target gray scale compensation data corresponding to a target data line displaying the image data according to the image data and the preset compensation table;

[0042] a data driver connected between the timing controller and the display panel, configured to drive the display panel to display the image data to be displayed according to the target gray scale compensation data.

[0043] In some embodiments, the timing controller is further configured to parse the image data to obtain position data and a target gray scale value, determine a target data line for displaying the image data according to the position data, and if the target data line does not belong to the data line farthest from the data driver, query the preset compensation table according to the target data line and the target gray scale value to obtain corresponding target gray scale compensation data.

[0044] Beneficial effects: The embodiments of the present application provide a driving compensation method of a display device and the display device. The present application obtains image data to be displayed by the display panel, obtains a preset compensation table corresponding to an impedance variation type of a fan-out area of the display panel according to the image data to be displayed, wherein the preset compensation table comprises a mapping relationship between a preset gray scale value, gray scale compensation data and a data line corresponding to a preset position node, determines target gray scale compensation data corresponding to a target data line for displaying the image data according to the image data and the preset compensation table, and drives display according to the target gray scale compensation data. In the case of mastering the impedance characteristics of the fan-out area of the display device, the charging difference caused by the impedance difference of the data line in the fan-out area is eliminated in advance, the image processing stage is compensated in advance before the driving system displays the image data, the charging voltage difference is not limited by the space of the fan-out area, the brightness uniformity of different positions of the liquid crystal display panel is improved, Mura is effectively eliminated, and the display effect of the display panel is improved. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0046] Figure 1 A schematic diagram of the distance difference between the data line of different column positions in the display device and the data driver.

[0047] Figure 2 A schematic diagram of the impedance variation of the data line of different column positions in the display device.

[0048] Figure 3 A schematic diagram of the snake type wiring of the data line in the fan-out area.

[0049] Figure 4 This is a schematic diagram comparing the waveforms of the near-end data line and the far-end data line.

[0050] Figure 5 This is a diagram illustrating the vertical dark areas of Mura in the image.

[0051] Figure 6 This is a flowchart illustrating a driving compensation method for a display device provided in an embodiment of this application.

[0052] Figure 7 This is a schematic diagram illustrating the impedance variation type of the data line within the fan-out region provided in an embodiment of this application.

[0053] Figure 8 This is a schematic diagram of the structure of the display device provided in the embodiments of this application.

[0054] Figure 9 A simplified equivalent circuit diagram of the display device provided in the embodiments of this application.

[0055] Figure 10 for Figure 9 A schematic diagram of the charging curve of the corresponding equivalent circuit.

[0056] Figure 11 This is a schematic diagram of a common type of preset compensation table provided in the embodiments of this application.

[0057] Figure 12 This is a schematic diagram showing the correspondence between common fan-out resistance variation types and preset compensation tables provided in the embodiments of this application.

[0058] Figure 13 This is a schematic diagram of the distal endpoint curve and the proximal endpoint curve provided in the embodiments of this application.

[0059] Figure 14 A flowchart illustrating the structure of the driving compensation method for a display device provided in an embodiment of this application.

[0060] Figure 15 The diagram illustrates the effect of the driving compensation method for the display device provided in the embodiments of this application. Detailed Implementation

[0061] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0062] In the description of the application, it should be understood that the terms "one end" "the other end" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "two or more" is two or more, unless otherwise explicitly specified.

[0063] It should be noted that the "connection" in the embodiments of the application can be understood as an electrical connection, and the connection between two electrical elements can be direct or indirect connection between two electrical elements. For example, A and B are connected, which can be direct connection between A and B, or indirect connection between A and B through one or more other electrical elements.

[0064] The circuit structure provided by the embodiments of the application is not a node representing an actual component, but a node representing a related coupling convergence point in the circuit diagram, that is, the node is equivalent to the node formed by the related coupling convergence point in the circuit diagram.

[0065] The following disclosure provides many different embodiments or examples for implementing different structures of the application. In order to simplify the disclosure of the application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the application. In addition, the application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can refer to the related description of other embodiments.

[0066] This application provides a driving compensation method for a display device and a display device. The display panel in the embodiments of this application can be used in mobile phones, tablet computers, desktop computers, laptop computers, e-readers, handheld computers, electronic display screens, laptops, ultra-mobile personal computers (UMPCs), netbooks, as well as cellular phones, personal digital assistants (PDAs), augmented reality (AR) / virtual reality (VR) devices, media players, wearable devices, digital cameras, car navigation systems, etc.

[0067] The display panel can be a liquid crystal display panel. This application does not limit the type of liquid crystal display panel. The liquid crystal display panel provided in this application can be a horizontal electric field type liquid crystal display panel, such as a fringe field switching (FFS) type liquid crystal display panel or an in-plane switching (IPS) type liquid crystal display panel, or a vertical electric field type liquid crystal display panel, such as a twisted nematic (TN) type liquid crystal display panel or a multi-domain vertical alignment (MVA) type liquid crystal display panel.

[0068] The display panel has a display area, a fan-out area, and data lines. The display area contains multiple pixels forming a pixel array. Each pixel includes a thin-film transistor (TFT) and a pixel electrode connected to the TFT. Each pixel's TFT is electrically connected to a scan line and a data line. Each data line extends from the display area to the fan-out area and is electrically connected to a data driver IC to receive drive signals for image display.

[0069] The difference in distance between different columns of data lines and the data driver results in differences in line impedance, such as... Figure 1 As shown, R2 > 1, which may lead to defects such as blocky mura in the vertical and / or horizontal directions. To resolve these defects caused by impedance differences, one can... Figure 3 As shown, the data lines are designed with serpentine / double-layer routing to achieve the same impedance at different locations. However, this method has limitations due to design constraints, such as insufficient fan-out width to meet the requirements of serpentine routing (equal length lines). Figure 4 As shown in the diagram, a comparison of the waveforms of the near-end and far-end data lines reveals that the voltage difference between the near-end and far-end data lines during LCD panel charging results in the waveforms that appear as shown.Figure 5 The vertical dark Mura phenomenon shown may not achieve the desired effect. Therefore, designing the data line with serpentine / double-layer routing cannot achieve resistance matching, cannot completely eliminate the occurrence of Mura defects, and reduces the picture quality of the LCD panel.

[0070] The driving compensation method and display device of this application will be described below with reference to the accompanying drawings to solve or improve the above-mentioned problems.

[0071] Please see Figure 6 This is a schematic flowchart of a driving compensation method for a display device provided in an embodiment of this application. The display device driving system and the display panel connected to the driving system are as follows: Figure 6 As shown, the driving compensation method for the display device includes:

[0072] S300: Obtain the image data to be displayed;

[0073] S400. Obtain a preset compensation table corresponding to the impedance change type of the fan-out region. The preset compensation table includes a mapping relationship between preset grayscale values, grayscale compensation data, and data lines corresponding to preset position nodes.

[0074] S500. Based on the image data and the preset compensation table, determine the target grayscale compensation data corresponding to the target data line for displaying the image data;

[0075] S600, Drive the display according to the target grayscale compensation data.

[0076] Specifically, the display device includes a display area and a fan-out area. The display area includes multiple data lines. The display device may also include a display driving circuit (i.e., the driving system of this application) and a display panel for displaying images. The display driving circuit (i.e., the driving system of this application) may include a timing controller, a data driver, etc. The display panel may include multiple scan lines GL1 to GLn (where n is an integer of 2 or greater) extending along a first direction, multiple data lines DL1 to DLm (where m is an integer of 2 or greater) arranged along a second direction intersecting the multiple scan lines GL1 to GLn, i.e., the second direction, and multiple pixels respectively disposed in multiple areas defined by the intersection points of the scan lines GL1 to GLn and the data lines DL1 to DLm. Wherein, as... Figure 14 The data driver shown is connected to the timing controller, as follows: Figure 8 The data driver shown is also connected to a data cable.

[0077] The red sub-pixels R, green sub-pixels G, and blue sub-pixels B in the display panel can be divided into periodically arranged and sequentially adjacent columns of red, green, and blue sub-pixels along a direction from one end of the scan line to the other. Each column of red, green, or blue sub-pixels corresponds to a data line, enabling the display device to output a corresponding grayscale voltage to the corresponding sub-pixel (e.g., red sub-pixel R, green sub-pixel G, or blue sub-pixel B) via the data line through the display driving circuit. It is understood that in this embodiment, the grayscale voltage of each sub-pixel can correspond to the grayscale voltage output to each sub-pixel via the data line, and is used to drive each sub-pixel to emit light.

[0078] The display device has a pre-stored compensation table for the impedance change type corresponding to its own fan-out zone before leaving the factory. The resistance change type of the data line in the fan-out zone is related to the routing of the data line in the fan-out zone. The impedance change types include, for example, Figure 7 The display devices for fan-out regions with different impedance variation types, such as symmetrical V-shapes, symmetrical V-shapes with differences between data drivers, asymmetrical V-shapes, symmetrical boat shapes, asymmetrical boat shapes, left wedge shapes, and right wedge shapes, store different preset compensation tables. It should be noted that this application does not limit the execution order of S100 and S200.

[0079] The timing controller can control all operations of the display driving circuit. For example, the timing controller can control the components of the display driving circuit (e.g., data driver and gate driver) so that the display panel displays an image corresponding to the image signal I_DATA received from the outside. After the timing controller obtains the image signal I_DATA, it can parse the image signal I_DATA to display and obtain the preset compensation table corresponding to the display device. The timing controller can then generate image data RGB_DATA based on the received image signal I_DATA, and query the preset compensation table according to the image data RGB_DATA to determine the target data line for displaying the image data, as well as the target grayscale compensation data corresponding to the image data RGB_DATA displayed on the target data line. The target grayscale compensation data is essentially a grayscale value. Thus, the timing controller transmits the corresponding target grayscale compensation data to the data driver. The data driver can convert the target grayscale compensation data corresponding to the image data RGB_DATA received from the timing controller into a corresponding grayscale voltage, and can output multiple grayscale voltages to the display panel through multiple data lines DL1 to DLm for driving the display, so that the display area of ​​the display panel displays the image or screen of the received image signal I_DATA.

[0080] The application eliminates the charging difference caused by the impedance difference of the fan-out area in advance under the condition of mastering the impedance characteristics of the fan-out area of the display device, compensates in the image processing stage of the timing controller, so that the elimination of the charging voltage difference is not limited by the space of the fan-out area, the brightness uniformity of different positions of the liquid crystal display panel is improved, Mura is effectively eliminated, and the display effect of the display panel is improved.

[0081] In some embodiments of the application, before the preset compensation table corresponding to the impedance variation type of the fan-out area of the display panel is obtained according to the image data to be displayed, the following steps are included:

[0082] S100, obtaining a voltage compensation coefficient between a first data line and a second data line of the display panel, the first data line being the data line closest to the driving system in the display panel, and the second data line being the remaining data line except the first data line in the display panel;

[0083] S200, creating a corresponding preset compensation table according to the voltage compensation coefficient.

[0084] Specifically, as shown in Figure 8 The first data line in the display area is farthest from the data driver in the horizontal direction, so the distance between the first data line in the fan-out area and the data driver is also the farthest, and the second data line includes data lines DL1 to DL6 and data lines DL8 to DLm except data line DL7. Among them, the line impedance of the data lines SL1 to SL7 in the fan-out area increases linearly in the order of sequence number from large to small, and similarly, the line impedance of the data lines SL7 to SLm in the fan-out area increases linearly in the order of sequence number from small to large. The execution subject of S100 to S200 in the application can be any test equipment or electronic equipment, and the voltage compensation coefficient between the first data line and the second data line can be calculated by S110 to S120 in the following embodiments. Then the test equipment creates a preset compensation table corresponding to each of all data lines except the one farthest from the data driver according to the voltage compensation coefficient between the first data line and the second data line based on the steps of S210 to S240 in the following embodiments.

[0085] In some embodiments of the application, the S100, obtaining the voltage compensation coefficient between the first data line and the second data line includes:

[0086] S110, obtaining a first preset gray scale voltage of the first data line and a second preset gray scale voltage of the second data line, the second preset gray scale voltage being greater than the first preset gray scale voltage;

[0087] S120, calculating a corresponding voltage compensation coefficient according to the first preset gray scale voltage and the second preset gray scale voltage.

[0088] Specifically, it is assumed that the display device is simplified into an equivalent circuit as shown in the following figure, where E represents the output voltage of the data driver, the resistance R and the capacitance C constitute the in-plane load of the display device (including circuit impedance, liquid crystal capacitance, holding capacitance, parasitic capacitance, etc.), and Vc represents the voltage across the capacitance C. Figure 9 A charging curve of the equivalent circuit as shown in the following figure, where E represents the output voltage of the data driver, the resistance R and the capacitance C constitute the in-plane load of the display device (including circuit impedance, liquid crystal capacitance, holding capacitance, parasitic capacitance, etc.), and Vc represents the voltage across the capacitance C. Figure 9 Figure 10 As shown in the following figure, in the initial stage, the charging current is maximum = E / R because Vc is 0, and the Vc voltage rapidly increases; as the charging time t changes, the Vc voltage increases, and the voltage difference (E-Vc) across the resistance R decreases, so the charging current gradually decreases. Thus, the test equipment or electronic equipment can calculate the first preset gray scale voltage of the first data line and the second preset gray scale voltage of the second data line according to the embodiments S111 to S114 below, and then calculate the corresponding voltage compensation coefficient according to the embodiments S121 to S122 below.

[0089] In some embodiments of the present application, the first preset gray scale voltage of the first data line and the second preset gray scale voltage of the second data line are obtained by:

[0090] S111, obtaining a first delay time constant of the first data line and a second delay time constant of the second data line, the second delay time constant being greater than the first delay time constant;

[0091] S112, obtaining a natural constant, a first output voltage provided by the driving system to the first data line, a second output voltage provided by the data driver to the second data line, a first charging time of the first data line, and a second charging time of the second data line;

[0092] S113, dividing the first charging time by the first delay time constant to obtain a first result, calculating a first power operation result according to the first result, taking the result of taking negative of the first result as the exponent and taking the natural constant as the base number, and calculating a product of a difference between a preset constant and the first power operation result and the first output voltage to obtain the first preset gray scale voltage corresponding to the first data line;

[0093] ​S114, the second charging time is divided by the second delay time constant to obtain a second result, a result of taking a negative of the second result is taken as an exponent, the natural constant is taken as a base number to calculate a second power operation result, a difference between a preset constant and the second power operation result is multiplied by the second output voltage to obtain the second preset gray scale voltage corresponding to the second data line.

[0094] Specifically, as shown in the process, Figure 10 can be represented by the following formula (1):

[0095]

[0096] wherein τ is a delay time constant, Vc is a voltage across the capacitor C, E is an output voltage of the data driver, e is a natural constant, and t is a charging time.

[0097] The delay time constant τ of a data line on the liquid crystal display panel satisfies the following formula (2):

[0098] τ = (R fanout + R AA ) * (C fanout + C AA ) (2)

[0099] wherein R fanout is a resistance value of the data line in the fan-out area, R AA is a resistance value of the data line in the display area, C fanout is a capacitance size of the data line in the fan-out area, and C AA is a capacitance size of the data line in the display area.

[0100] Of course, the above formula (1) is only an example, for example, the second preset gray scale voltage corresponding to the first data line and the second data line can also be calculated by , wherein β is an arbitrary constant greater than zero. Similarly, the formula (2) can also be multiplied by an arbitrary constant greater than zero.

[0101] From the above formula (2), it can be seen that the delay time constant τ of the data line connected to each data line is known to change with its length, and the delay time constant τ is positively correlated with the impedance value of the data line, so the first preset gray scale voltage corresponding to the first data line can be calculated by substituting the first delay time constant τ1 of the first data line into the formula (1) as follows.

[0102]

[0103] Wherein, τ1 is a first delay time constant, Vc1 is a voltage across the first capacitor C, E1 is a first output voltage provided by the data driver to the first data line, e is a natural constant, and t is a charging time.

[0104] The second preset gray scale voltage corresponding to the first data line is calculated according to the second delay time constant τ2 of the second data line and substituted into formula (1) as formula (4) below.

[0105]

[0106] Wherein, τ2 is a second delay time constant, Vc is a voltage across the capacitor C, E2 is a second output voltage provided by the data driver to the second data line, e is a natural constant, and t is a charging time.

[0107] In some embodiments of the present application, the corresponding voltage compensation coefficient is calculated according to the first preset gray scale voltage and the second preset gray scale voltage, which includes:

[0108] S121, set the first preset gray scale voltage of the first data line equal to the second preset gray scale voltage of any second data line, so that the charging voltage difference between the first data line and the second data line is eliminated.

[0109] S122, divide the first preset gray scale voltage by the second preset gray scale voltage to calculate the voltage compensation coefficient of the second data line relative to the first data line.

[0110] Specifically, since the target of the present application is to make Vc1 = Vc2 at t (t is a charging time), i.e. to eliminate the charging voltage difference, the following formula (5) is obtained by substituting the above formula (3) and formula (4):

[0111]

[0112] According to the above formula (5), the following formula (6) can be derived.

[0113]

[0114] Suppose τ1 = R1 * C = 1us, τ2 = R2 * C = 1.2us, t = 3 * τ1, and substitute the above formula (6), the voltage compensation coefficient K between the first data line and the second data line is 0.966. It should be noted that the values of τ1, τ2 and t are only examples, and other value ranges can be measured according to the characteristics of the display device.

[0115] Of course, the above formula (6) is only an example, for example, the voltage compensation coefficient K between the first data line and the second data line can also be equal to a is any constant greater than zero.

[0116] In some embodiments of the present application, the S200, creating the preset compensation table corresponding to the voltage compensation coefficient comprises:

[0117] S210, obtaining a first relationship curve of a third data line, the third data line being the second data line farthest from the driving system, the first relationship curve comprising a mapping relationship between a plurality of first gray scale values and a plurality of first gamma voltages;

[0118] S220, obtaining a second relationship curve of the first data line and a second relationship curve of the second data line, the second relationship curve comprising a mapping relationship between a plurality of second gray scale values and a plurality of second gamma voltages;

[0119] S230, obtaining gray scale compensation data corresponding to the first data line and the second data line according to the voltage compensation coefficient, the first relationship curve and the second relationship curve;

[0120] S240, obtaining the preset compensation table according to the mapping relationship between the data line position, the plurality of second gray scale values and the gray scale compensation data.

[0121] Specifically, the display panel of the display device can be driven to display a pure color picture according to a preset gamma voltage, and then the display panel displaying the pure color picture can be photographed by using an imaging assembly to obtain a target image including the display panel, and the gray scale values of each pixel point can be obtained according to the target image. The imaging assembly can be a camera, a camera, or the like. The shortest distance from the optical center of the lens of the imaging assembly to the display panel is less than the normal working distance of the imaging assembly. In this embodiment, the normal working distance of the imaging assembly is the working distance of the imaging assembly when the image distortion in the area of the display panel photographed by the imaging assembly is not or is at the minimum. After obtaining the target image from the imaging assembly, the original brightness data corresponding to each pixel unit to which all pixel points belong is extracted from the target image, and then the gray scale values corresponding to each column of pixel units can be analyzed according to the original brightness data. In this way, according to the relationship between the gray scale values corresponding to each column of pixel units and the plurality of preset gamma voltages, a relationship curve corresponding to the data line connected by each column of pixel units is drawn. According to the above method, the first relationship curve corresponding to the third data line farthest from the data driver can be drawn, and the second relationship curve corresponding to the first data line and the second relationship curve corresponding to each of the remaining second data lines except the third data line in the plurality of second data lines can be drawn. Then, the electronic device or the measuring device obtains the gray scale compensation data corresponding to the first data line and the gray scale compensation data corresponding to the second data line according to the processes of S231 to S235 in the following embodiment.

[0122] Since the data controller is connected to the corresponding data line through the output channel Channel, if the position or serial number of the data line is known, the channel serial number of the output channel Channel connected to the data line can be obtained. The data line serial number (also known as the position node) corresponds to the output channel serial number one by one, so the serial number value of the data line of the present application is equal to the serial number value of the output channel. After the electronic device or the measuring device obtains the position information of different data lines, the corresponding data line signal can be obtained according to the position information of the data line. In this way, the electronic device or the measuring device of the present application can bind the position node of the first data line, the mapping relationship between the first data line and the plurality of second gray scale values and the gray scale compensation data to generate a preset compensation table of the first data line. Similarly, the electronic device or the measuring device can bind the position node of the second data line, the mapping relationship between the second data line and the plurality of second gray scale values and the gray scale compensation data to generate a preset compensation table of the second data line.

[0123] The electronic device or the measuring device according to the resistance change type (also referred to as impedance change type) of different display devices or fan-out areas, selects to save different gray scale value node numbers or the position node numbers corresponding to the proximal data line (i.e., the first data line of the present application) to the distal data line (i.e., the second data line of the present application), and according to the gray scale compensation data corresponding to different gray scale values of the proximal data line and the distal data line, one-to-one mapping and binding to form a compensation table. For example Figure 11 Some common preset compensation tables are listed as follows Figure 12 The correspondence between the common fan-out area resistance change type and the preset compensation table is shown in the following table.

[0124] It should be noted that in the case of non-linear change of capacitance impedance or delay time constant, the gray scale compensation data of the data line corresponding to the output channel of the non-gray scale value node and the non-position node between the plurality of data lines can be obtained by interpolation, and finally the calculated gray scale compensation data of the data line corresponding to the output channel of the non-gray scale value node and the non-position node is saved in the memory (such as flash, E2Prom, etc.) of the display device.

[0125] In some embodiments of the present application, the S230, according to the voltage compensation coefficient, the first relationship curve and the second relationship curve, obtains the gray scale compensation data corresponding to the first data line and the second data line, including:

[0126] S231, obtaining a first gamma voltage corresponding to any first gray scale value in the first relationship curve;

[0127] S232, obtaining a corresponding voltage compensation coefficient according to the second relationship curve and the first relationship curve;

[0128] S232, obtaining a corresponding second gamma voltage by multiplying the first gamma voltage by the voltage compensation coefficient;

[0129] S234, finding a corresponding second gray scale value from the first relationship curve according to the second gamma voltage, the second gray scale value being less than the first gray scale value;

[0130] S235, performing difference calculation on the first gray scale value and the second gray scale value to obtain the gray scale compensation data corresponding to the first data line and the second data line.

[0131] Specifically, taking the 0-255 gray scale voltage of the far-end data line, i.e., the third data line, as a reference, and combining the calculation result of the voltage compensation coefficient K value in the foregoing embodiment, the corresponding gamma voltage of each first data line and the third data line in different gray scale ranges can be determined. The electronic device or the test device refers to the foregoing embodiment to obtain the first relationship curve and the second relationship curve. Taking the second relationship curve corresponding to the first data line and the first relationship curve corresponding to the third data line as an example, as shown in Figure 13 , the far-end point curve is the first relationship curve of the third data line of the present application, and the near-end point curve is the second relationship curve of the first data line of the present application. Then, the electronic device or the test device takes the first gamma voltage Vi_grayN corresponding to any first gray scale value Gray N in the first relationship curve as a reference. Since the voltage compensation coefficient K value between the third data line and the first data line is known, multiplying any first gamma voltage Vi_grayN in the first relationship curve corresponding to the third data line by the voltage compensation coefficient between the third data line and the first data line can calculate the corresponding second gamma voltage Vj_grayN. Then, according to the calculated second gamma voltage Vj_grayN as the ordinate, the corresponding abscissa, i.e., the second gray scale value Gray X, is found from the far-end point curve (i.e., the first relationship curve of the third data line of the present application). Then, the first gray scale value and the second gray scale value are calculated by difference to obtain the gray scale compensation data corresponding to the first data line and the second data line. For example, as shown in Figure 13 , assuming that the first gray scale value Gray N is equal to 255, the corresponding compensation value (i.e., the gray scale compensation data) = 255-252 = 3. Also, for example, assuming that the first gray scale value Gray N is equal to 128, the corresponding compensation value (i.e., the gray scale compensation data) = 128-123 = 5. In some embodiments of the present application, the S500, according to the image data and the preset compensation table, determines the target gray scale compensation data corresponding to the target data line for displaying the image data, comprising:

[0132] S510, obtaining position data and a target gray scale value by analyzing the image data;

[0133] S520, determining the target data line for displaying the image data according to the position data;

[0134] S530, if the target data line does not belong to the data line farthest from the data driver, according to the target data line and the target gray scale value, querying the preset compensation table to obtain the corresponding target gray scale compensation data.

[0135] Specifically, as shown in Figure 14As shown, the timing controller can obtain position data of the display image data according to the input image data, and then determine the data line number according to the obtained position data, and then determine the target data line of the display image data. In addition, the timing controller can also obtain the target gray scale value of the image data to be displayed according to the image data. If the timing controller analyzes that the target data line is the third data line farthest from the data driver, the timing controller determines not to compensate, and directly transmits the target gray scale value to the data driver, so that the data driver drives the display according to the target gray scale value. However, if the timing controller analyzes that the target data line is the first data line closest to the data driver, the timing controller can query the gray scale compensation data and the preset compensation table stored in the storage, and then obtain the target gray scale compensation data corresponding to the target gray scale value and the first data line. The timing controller transmits the obtained target gray scale compensation data to the data driver, so that the data driver drives the display according to the target gray scale compensation data.

[0136] For example, still taking the compensation of the charging time CT = 3τ as the target, after using the driving compensation scheme of the present application, as Figure 15 As shown, the charging voltages between the far-end data line and the near-end data line of the compensated display panel are equal.

[0137] The present application eliminates the charging difference caused by the impedance difference of the fan-out area of the data line in advance under the condition of mastering the impedance characteristics of the fan-out area of the display device, reduces the charging voltage difference between the two-side data lines and the middle data line on the liquid crystal display panel as a whole, compensates in the image processing stage of the timing controller, so that the elimination of the charging voltage difference is not limited by the space of the fan-out area, thereby ensuring the display uniformity of the display picture, effectively eliminating the vertical Mura, and improving the display effect of the display panel.

[0138] The present application provides different gray scale values to the data lines at different positions in the display panel, and then provides different gamma voltages with different values to the data lines at different positions in the display panel according to different gray scale values, so as to compensate the vertical Mura phenomenon, so that different regions of the display panel have the same display effect, and the decline of the display quality caused by the impedance difference of different positions in the display panel can be improved, the picture quality is improved, and the display effect of the display panel is effectively improved.

[0139] According to the above-mentioned driving compensation method of the display device, the present application also provides a display device, which comprises a display panel, a storage and a processor. The storage stores a computer program, and the processor is used to run the computer program in the storage to execute the steps in the driving compensation method of the display device.

[0140] The memory is an internal storage unit of the display device, for example, a hard disk or a memory of the display device, etc. Alternatively, the memory is an external storage device of the display device, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the memory can include both the internal storage unit and the external storage device of the display device. The memory is used to store application software and various data installed in the display device, or to temporarily store data that has been output or will be output. The memory stores computer execution instructions that can be executed by the processor, thereby implementing the steps in the driving compensation method of the display device.

[0141] The display device according to an example embodiment can be equipped in an electronic device having an image display function. For example, the electronic device can include a smartphone, a tablet personal computer (PC), a portable multimedia player (PMP), a camera, a wearable device, a television (TV), a digital video disk (DVD) player, a refrigerator, an air conditioner, an air purifier, a set-top box, a robot, a drone, various medical devices, a navigation device, a global positioning system (GPS) receiver, a vehicle device, furniture, or various measuring devices.

[0142] According to the driving compensation method of the display device, the present embodiment also provides a storage medium storing a plurality of instructions, which are suitable for being loaded by a processor to execute the steps in the driving compensation method of the display device.

[0143] The storage medium can include non-volatile and / or volatile memory. The non-volatile memory can include read-only memory (ROM), programmable memory (PROM), electrically programmable memory (EPROM), electrically erasable programmable memory (EEPROM), or flash memory, etc. The volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not as a limitation, the RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), memory bus direct RDRAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0144] It should be noted that the storage medium stores one or more computer programs, and the one or more processors load the one or more computer programs to execute the steps in any of the display device driving compensation methods provided by the embodiments of the present application.

[0145] Due to the computer programs stored in the storage medium, the steps in any of the display device driving compensation methods provided by the embodiments of the present application can be executed, and thus the beneficial effects of any of the display device driving compensation methods provided by the embodiments of the present application can be achieved. Details are described in the foregoing embodiments, which will not be repeated here.

[0146] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0147] The display device driving compensation method, display panel, and storage medium provided by the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples in this paper. The above embodiment descriptions are only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range can be changed, and the above description should not be understood as a limitation of the present application. In addition, for those skilled in the art, without departing from the principles of the present application, some improvements and refinements can be made, which are also regarded as the protection scope of the present application.

Claims

1. A driving compensation method of a display device, characterized by, The display device comprises a driving system and a display panel connected with the driving system, and the method comprises: acquiring image data to be displayed by the display panel; acquiring a preset compensation table corresponding to an impedance change type of a fan-out area of the display panel according to the image data to be displayed, wherein the preset compensation table comprises a preset gray scale value, gray scale compensation data and a mapping relationship between data lines corresponding to preset position nodes; determining target gray scale compensation data corresponding to a target data line for displaying the image data according to the image data and the preset compensation table; driving display according to the target gray scale compensation data; before the step of acquiring the preset compensation table corresponding to the impedance change type of the fan-out area of the display panel according to the image data to be displayed, the method further comprises: acquiring a voltage compensation coefficient between a first data line and a second data line of the display panel, the first data line being the data line closest to the driving system in the display panel, and the second data line being the data line other than the first data line in the display panel; acquiring a first relationship curve of a third data line of the display panel, the third data line being the second data line farthest from the driving system, the first relationship curve comprising a mapping relationship between a plurality of first gray scale values and a plurality of first gamma voltages; acquiring a second relationship curve of the first data line and a second relationship curve of the second data line, the second relationship curve comprising a mapping relationship between a plurality of second gray scale values and a plurality of second gamma voltages; acquiring a first gamma voltage corresponding to any first gray scale value in the first relationship curve, acquiring a corresponding voltage compensation coefficient according to the second relationship curve and the first relationship curve, and calculating gray scale compensation data corresponding to the first data line and the second data line based on the first gamma voltage and the voltage compensation coefficient; acquiring the preset compensation table according to a mapping relationship between data line positions, a plurality of second gray scale values and the gray scale compensation data.

2. The driving compensation method of a display device according to claim 1, wherein The step of acquiring the voltage compensation coefficient between the first data line and the second data line comprises: acquiring a first preset gray scale voltage of the first data line and a second preset gray scale voltage of the second data line, the second preset gray scale voltage being greater than the first preset gray scale voltage; calculating a corresponding voltage compensation coefficient according to the first preset gray scale voltage and the second preset gray scale voltage.

3. The driving compensation method of a display device according to claim 2, wherein The step of acquiring the first preset gray scale voltage of the first data line and the second preset gray scale voltage of the second data line comprises: acquiring a first delay time constant of the first data line and a second delay time constant of the second data line, the second delay time constant being greater than the first delay time constant; acquiring a natural constant, a first output voltage provided by the driving system to the first data line, a second output voltage provided by a data driver to the second data line, a first charging time of the first data line and a second charging time of the second data line; The first charging time is divided by the first delay time constant to obtain a first result, a result of taking a negative of the first result is taken as an index, a first power operation result is calculated by taking the natural constant as a base, a difference between a preset constant and the first power operation result is multiplied by the first output voltage to obtain the first preset gray scale voltage corresponding to the first data line; The second charging time is divided by the second delay time constant to obtain a second result, a result of taking a negative of the second result is taken as an index, a second power operation result is calculated by taking the natural constant as a base, a difference between a preset constant and the second power operation result is multiplied by the second output voltage to obtain the second preset gray scale voltage corresponding to the second data line.

4. The driving compensation method of a display device according to claim 3, wherein The calculation of the corresponding voltage compensation coefficient according to the first preset gray scale voltage and the second preset gray scale voltage comprises: The first preset gray scale voltage of the first data line is set to be equal to the second preset gray scale voltage of any second data line, so that the charging voltage difference between the first data line and the second data line is eliminated; The first preset gray scale voltage is divided by the second preset gray scale voltage to obtain a voltage compensation coefficient of the second data line relative to the first data line.

5. The driving compensation method of a display device according to claim 4, wherein The calculation of the gray scale compensation data corresponding to the first data line and the second data line based on the first gamma voltage and the voltage compensation coefficient comprises: A second gamma voltage corresponding to the first gamma voltage is obtained by multiplying the voltage compensation coefficient; A second gray scale value corresponding to the second gamma voltage is found from the first relationship curve, and the second gray scale value is less than the first gray scale value; The first gray scale value is subtracted from the second gray scale value to obtain the gray scale compensation data corresponding to the first data line and the second data line.

6. The driving compensation method of a display device according to any one of claims 1 to 5, wherein The determination of the target gray scale compensation data corresponding to the target data line for displaying the image data according to the image data and the preset compensation table comprises: The image data is parsed to obtain position data and a target gray scale value; The target data line for displaying the image data is determined according to the position data; If the target data line does not belong to the data line farthest from the data driver, the target gray scale compensation data corresponding to the target data line is obtained by querying the preset compensation table according to the target data line and the target gray scale value.

7. A display device, characterized by comprising: The display device comprises a driving system and a display panel connected with the driving system, and the driving system comprises: A memory stores a preset compensation table and image data to be displayed, wherein the preset compensation table comprises a mapping relationship between a preset gray scale value, gray scale compensation data and a data line corresponding to a preset position node; A timing controller is configured to acquire a preset compensation table corresponding to an impedance change type of a fan-out area of the display panel according to the image data to be displayed, and determine target gray scale compensation data corresponding to a target data line for displaying the image data according to the image data and the preset compensation table. a data driver connected between the timing controller and the display panel, configured to compensate data driving of the display panel according to the target gray scale compensation data to display the image data to be displayed; The timing controller is further configured to acquire a voltage compensation coefficient between a first data line and a second data line of the display panel, the first data line being the data line closest to the driving system in the display panel, and the second data line being the data line other than the first data line in the display panel; acquire a first relationship curve of a third data line of the display panel, the third data line being the second data line farthest from the driving system, the first relationship curve including a mapping relationship between a plurality of first gray scale values and a plurality of first gamma voltages; acquire a second relationship curve of the first data line and a second relationship curve of the second data line, the second relationship curve including a mapping relationship between a plurality of second gray scale values and a plurality of second gamma voltages; acquire a first gamma voltage corresponding to any first gray scale value in the first relationship curve, acquire a corresponding voltage compensation coefficient according to the second relationship curve and the first relationship curve, and calculate gray scale compensation data corresponding to the first data line and the second data line based on the first gamma voltage and the voltage compensation coefficient; and acquire the preset compensation table according to a mapping relationship between a data line position, a plurality of the second gray scale values and the gray scale compensation data.

8. The display device of claim 7, wherein The timing controller is further configured to acquire position data and a target gray scale value by analyzing the image data, to determine a target data line for displaying the image data according to the position data, and to acquire corresponding target gray scale compensation data from the preset compensation table according to the target data line and the target gray scale value if the target data line is not the data line farthest from the data driver.

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