Display devices

Abstract

A display device and a method for driving the display device are provided. The display device according to an embodiment includes: a plurality of pixel rows; a data driver configured to provide a first data voltage corresponding to first-line grayscale data to pixels arranged in an N-1th pixel row, provide a second data voltage corresponding to second-line grayscale data to pixels arranged in an Nth pixel row, and provide a third data voltage corresponding to third-line grayscale data to pixels arranged in an N+1th pixel row; and a data compensator configured to compensate the second-line grayscale data by using one of a first compensation and a second compensation based on the first-line grayscale data, the second-line grayscale data, and the third-line grayscale data.

Description

[0001] This application claims priority to and all benefits derived from Korean Patent Application No. 10-2020-0021274, filed on February 20, 2020, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to a display device and a method of driving the display device. Background Art

[0003] As information technology develops, the importance of display devices as a connection medium between users and information increases. Therefore, the use of display devices such as liquid crystal display devices, organic light emitting display devices, and plasma display devices is increasing.

[0004] Display devices display image frames using multiple illuminated pixels. When displaying image frames, line crosstalk defects may occur, degrading display quality, depending on the image frame pattern. When line crosstalk defects occur, unexpected bright or dark lines are displayed, potentially causing users to perceive them as display errors. Summary of the Invention

[0005] An object of the present disclosure is to provide a display device capable of minimizing a line crosstalk defect by preventing a data voltage from being excessively applied and a method of driving the display device.

[0006] In addition, another object of the present disclosure is to provide a display device capable of reducing power consumption by preventing a data voltage from being unnecessarily compensated and a method of driving the display device.

[0007] The objects of the present disclosure are not limited to the objects described above, and other technical objects not described above will be clearly understood by those skilled in the art from the following description.

[0008] According to an embodiment of the present disclosure, a display device for solving the above-described purpose includes: a plurality of pixel rows, each pixel row including a plurality of pixels; a data driver configured to supply a first data voltage corresponding to first-line grayscale data to pixels arranged in an N-1th pixel row (N is a natural number greater than 2), supply a second data voltage corresponding to second-line grayscale data to pixels arranged in an Nth pixel row, and supply a third data voltage corresponding to third-line grayscale data to pixels arranged in an N+1th pixel row; and a data compensator configured to compensate the second-line grayscale data by using one of a first compensation and a second compensation based on the first, second, and third-line grayscale data. The data driver supplies a compensated second data voltage to the Nth pixel row based on compensated grayscale data in which the second-line grayscale data is compensated, wherein the second-line grayscale data is compensated by the first compensation so that a data voltage greater than the data voltage corresponding to the second-line grayscale data is output, and the second-line grayscale data is compensated by the second compensation so that a data voltage less than the data voltage corresponding to the second-line grayscale data is output.

[0009] The data compensator may include: a first driver configured to output one of a first activation signal and a second activation signal for selecting one of a first compensation and a second compensation based on first line grayscale data, second line grayscale data, and third line grayscale data; and a second driver configured to output compensated grayscale data in response to one of the first activation signal and the second activation signal.

[0010] The first driver may include: a first data comparator configured to compare the first line grayscale data with the second line grayscale data to output a first line comparison value; a second data comparator configured to compare the second line grayscale data with the third line grayscale data to output a second line comparison value; and a compensation determiner configured to output one of a first activation signal and a second activation signal based on the first line comparison value and the second line comparison value.

[0011] The compensation determiner may include a first determiner configured to output determination data based on the first line comparison value and the second line comparison value; and a second determiner configured to output one of the first activation signal and the second activation signal based on the determination data.

[0012] The first determiner may compare each of the first line comparison value and the second line comparison value with a preset first reference value, and when both the first line comparison value and the second line comparison value are greater than or less than the first reference value, the first determiner may output a first value as determination data, and when only one of the first line comparison value and the second line comparison value is greater than the first reference value, the first determiner may output a second value as determination data.

[0013] The second determiner can compare the sum of the determined data with a preset second reference value. When the sum of the determined data is less than or equal to the second reference value, the second determiner can output a first activation signal, and when the sum of the determined data is greater than the second reference value, the second determiner can output a second activation signal.

[0014] When all of the first line grayscale data, the second line grayscale data, and the third line grayscale data are the same, the first driver may output the third activation signal, and the second driver may output the second line grayscale data as is in response to the third activation signal.

[0015] The second driver may include: a first compensator configured to output first compensation data using a first compensation in response to a first activation signal; and a second compensator configured to output second compensation data using a second compensation in response to a second activation signal. The second driver may output one of the first compensation data and the second compensation data as compensated grayscale data.

[0016] The second data voltage corresponding to the first compensation data may be greater than the data voltage corresponding to the second line grayscale data.

[0017] The first compensator may include a first lookup table in which first compensation data corresponding to a relationship between the first line grayscale data and the second line grayscale data is stored.

[0018] The second data voltage corresponding to the second compensation data may be lower than the data voltage corresponding to the second line grayscale data.

[0019] The second compensator may include a second lookup table in which second compensation data corresponding to the relationship between the first line grayscale data and the second line grayscale data is stored.

[0020] According to an embodiment of the present disclosure, a method for driving a display device for solving the above-described purpose is a method for driving a display device including a plurality of pixel rows, a data driver configured to provide data voltages to the plurality of pixel rows, and a data compensator configured to output compensated grayscale data. The method includes: comparing first-line grayscale data of the N-1th pixel row (N is a natural number greater than 2) with second-line grayscale data of the Nth pixel row to output a first line comparison value; comparing the second-line grayscale data with third-line grayscale data of the N+1th pixel row to output a second line comparison value; outputting one of a first activation signal for activating a first compensation and a second activation signal for activating a second compensation based on the first and second line comparison values; outputting compensated grayscale data in response to one of the first and second activation signals; and providing a data voltage to the Nth pixel row based on the compensated grayscale data. Through the first compensation, the second-line grayscale data is compensated so that a data voltage greater than the data voltage corresponding to the second-line grayscale data is output, and through the second compensation, the second-line grayscale data is compensated so that a data voltage less than the data voltage corresponding to the second-line grayscale data is output.

[0021] Outputting one of the first activation signal and the second activation signal may include: outputting determination data based on the first line comparison value and the second line comparison value; and outputting one of the first activation signal and the second activation signal based on a sum of the determination data.

[0022] Outputting the determination data may include: comparing each of the first line comparison value and the second line comparison value with a preset first reference value, and when both the first line comparison value and the second line comparison value are greater than or less than the first reference value, outputting the first value as the determination data; and when only one of the first line comparison value and the second line comparison value is greater than the first reference value, outputting the second value as the determination data.

[0023] By comparing the sum of the determination data with a second reference value, a first activation signal may be output when the sum of the determination data is less than or equal to the second reference value.

[0024] By comparing the sum of the determination data with a second reference value, a second activation signal may be output when the sum of the determination data is greater than the second reference value.

[0025] Outputting the compensated gray data may include: outputting first compensation data in response to the first activation signal; outputting second compensation data in response to the second activation signal; and outputting one of the first compensation data and the second compensation data as the compensated gray data.

[0026] Outputting the first compensation data in response to the first activation signal may include: using a first lookup table in which first compensation data corresponding to the relationship between the first line grayscale data and the second line grayscale data is stored, and a data voltage corresponding to the first compensation data may be greater than a data voltage corresponding to the second line grayscale data.

[0027] Outputting the second compensation data in response to the second activation signal may include: using a second lookup table in which second compensation data corresponding to the relationship between the first line grayscale data and the second line grayscale data is stored, and the data voltage corresponding to the second compensation data may be lower than the data voltage corresponding to the second line grayscale data.

[0028] Specific details of other embodiments are included in the detailed description and accompanying drawings.

[0029] A display device and a method of driving the display device according to an embodiment of the present disclosure may minimize a line crosstalk defect of the display device by preventing a data voltage from being excessively applied.

[0030] In addition, the display device and the method of driving the display device according to the embodiments of the present disclosure can reduce power consumption of the display device by preventing the data voltage from being unnecessarily compensated.

[0031] The effects according to the embodiment are not limited to the details exemplified above, and more various effects are included in this specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other features of the present disclosure will become more apparent by further describing the embodiments of the present disclosure in detail with reference to the accompanying drawings, in which:

[0033] Figure 1 is a diagram schematically illustrating a display device according to an embodiment of the present disclosure;

[0034] Figure 2 The diagram is included in Figure 1 a circuit diagram of an example of a pixel in a display device;

[0035] Figure 3 It is used to describe the Figure 1 A diagram of a data compensator in a display device;

[0036] Figure 4 It is used to describe the Figure 3 a diagram of a first driver in a data compensator;

[0037] Figure 5 is used to describe the Figure 4 a graph of determination data output by a first determiner in a first driver;

[0038] Figure 6A is a diagram for describing an example of a data voltage compensated by a first compensation of a first compensator;

[0039] Figure 6B is a diagram for describing an example of a data voltage compensated by a second compensation of a second compensator;

[0040] Figure 7 is a diagram for describing a data compensator according to another embodiment;

[0041] Figure 8 It is used to describe the Figure 7 a diagram of a first driver in a data compensator; and

[0042] Figure 9 is used to describe the Figure 8 A diagram of determination data output by a first determiner in a first driver. DETAILED DESCRIPTION

[0043] The advantages and features of the present disclosure and methods for achieving them will become apparent with reference to the embodiments described in detail below and the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and can be implemented in various forms. The present embodiments are provided so that the present disclosure will be thorough and complete and those skilled in the art to which the present disclosure belongs can fully understand the scope of the present disclosure. The present disclosure is limited only by the scope of the claims.

[0044] The case where an element or layer is referred to as being "on" another element or layer includes the case where the element or layer is directly provided on the other element or layer and the case where one or more intermediate elements or layers are provided between the element or layer and the other element or layer. Throughout the specification, the same reference numerals refer to the same components. The shapes, sizes, ratios, angles, quantities, etc. disclosed in the drawings for describing the embodiments are exemplary, and therefore, the present disclosure is not limited thereto.

[0045] Although the terms first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, within the technical spirit of the present disclosure, the first component mentioned below may be the second component. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the accompanying drawings, the same or similar reference numerals are used for the same components.

[0046] Each of the features of the various embodiments of the present disclosure can be coupled or combined with each other in part or in whole, and various linkages and drives in technology are possible. Each embodiment can be implemented independently of each other, and the association of each embodiment can be implemented together.

[0047] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0048] Figure 1 is a diagram schematically illustrating a display device according to an embodiment of the present disclosure.

[0049] refer to Figure 1 , the display device 10 according to the embodiment may include a display area 100 , a scan driver 200 , a data driver 300 , a timing controller 400 , and a data compensator 500 .

[0050] The display area 100 can display an image. The display area 100 can be implemented as a display panel. The display area 100 may include various display elements, such as organic light-emitting elements (e.g., organic light-emitting diodes (OLEDs)). Hereinafter, for convenience, a display device 10 including an organic light-emitting element as a display element will be described. However, the present disclosure is not limited thereto and can be applied to various methods of display devices such as liquid crystal display devices (LCDs), electrophoretic display devices (EPDs), and inorganic light-emitting display devices.

[0051] The display area 100 may include data lines DL1 to DLm (where m is a positive integer), scan lines SL1 to SLn (where n is a positive integer) (or gate lines), and pixels PX. Each pixel PX may be arranged in an area divided by the data lines DL1 to DLm and the scan lines SL1 to SLn. The pixels PX may be electrically connected to the data lines DL1 to DLm and the scan lines SL1 to SLn.

[0052] For example, pixels PX disposed in the first row and first column may be connected to the first data line DL1 and the first scan line SL1. For another example, pixels PX disposed in the nth row and mth column may be connected to the mth data line DLm and the nth scan line SLn.

[0053] However, the pixel PX is not limited thereto. For example, the pixel PX may be connected to scan lines corresponding to adjacent rows (eg, a scan line corresponding to a previous row including the pixel PX and a scan line corresponding to a subsequent row).

[0054] In addition, the pixel PX may be electrically connected to a first driving voltage line and a second driving voltage line to receive a first driving voltage VDD and a second driving voltage VSS, as shown in FIG. Figure 2 As disclosed in . Here, the first driving voltage VDD and the second driving voltage VSS may be voltages required to drive the pixel PX. Here, the first driving voltage VDD may have a value greater than the value of the second driving voltage VSS. At the same time, an initialization voltage or the like may be further supplied to the pixel PX.

[0055] In response to the scan signal provided through the corresponding scan line, the pixel PX can emit light at a brightness corresponding to the data signal provided through the corresponding data line. Figure 2 The detailed configuration and operation of the pixel PX are described.

[0056] Meanwhile, the plurality of pixels PX may include a plurality of pixel rows PXR1 to PXRn. For example, the first pixel row PXR1 may include a plurality of pixels PX connected to the first scan line SL1, and the second pixel row PXR2 may include a plurality of pixels PX connected to the second scan line SL2. Similarly, the n-th pixel row PXRn may include a plurality of pixels PX connected to the n-th scan line SLn.

[0057] The scan driver 200 (or gate driver) can generate a scan signal (or gate signal) based on the gate control signal GCS and provide the scan signal to the scan lines SL1 to SLn. Here, the gate control signal GCS can be a signal for controlling the operation of the scan driver 200 and can include a start signal and a clock signal, etc. For example, the scan driver 200 can use the clock signal to sequentially generate and output a scan signal corresponding to the start signal (for example, a scan signal having a waveform that is the same as or similar to the waveform of the start signal). The scan driver 200 can be implemented as a shift register, but is not limited thereto. The scan driver 200 can be formed on an area of ​​the display area 100, or can be implemented as an integrated circuit and can be mounted on a flexible circuit board to connect to the display area 100.

[0058] The data driver 300 may be implemented as an integrated circuit (IC) (e.g., a driver IC) or may be mounted on a flexible circuit board to be connected to the display area 100. The data driver 300 may generate a data signal (or data voltage) based on the image data DATA2 and the data control signal DCS, and may provide the data signal to each of the pixel rows PXR1 to PXRn through the data lines DL1 to DLm. Here, the data control signal DCS is a signal for controlling the operation of the data driver 300 and may include a load signal, a start signal, a clock signal, and the like.

[0059] The image data DATA2 supplied to the data driver 300 may include grayscale information (or line grayscale data) corresponding to each of the pixel rows PXR1 to PXRn. The data driver 300 may supply a data voltage to the pixel rows PXR1 to PXRn corresponding to the line grayscale data. Here, the image data DATA2 supplied to the data driver 300 may be data including line grayscale data compensated by the data compensator 500 to be described later. Figure 3 Describes line grayscale data.

[0060] The timing controller 400 may receive input image data DATA1 (e.g., RGB data) and input control signals for each frame from an external processor (e.g., a graphics processor). The input image data DATA1 may include grayscale values ​​corresponding to each pixel PX. The input control signals may include a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a main clock signal MCLK, and a data enable signal DE.

[0061] The timing controller 400 can generate image data DATA2 based on the input image data DATA1. Specifically, the timing controller 400 can render the input image data DATA1 so that the input image data DATA1 corresponds to the specifications of the display device 10. For example, an external processor can provide a red grayscale value, a green grayscale value, and a blue grayscale value for each unit point. For example, when the display area 100 is an RGB stripe structure, the pixels can correspond one-to-one to the corresponding grayscale values. In this case, rendering of the input image data DATA1 may not be required. However, for example, when the display area 100 has a five-grid structure, since adjacent unit points share pixels, the pixels may not correspond one-to-one to the corresponding grayscale values. In this case, rendering of the input image data DATA1 may be required. Image data rendered or not rendered by the timing controller 400 can be provided to the data driver 300 (or data compensator 500).

[0062] In addition, the timing controller 400 may generate a gate control signal GCS and a data control signal DCS based on the input control signal. The timing controller 400 may provide the gate control signal GCS to the scan driver 200 and may provide the data control signal DCS to the data driver 300.

[0063] The data compensator 500 can compensate the image data DATA2 generated by the timing controller 400. As described above, the image data DATA2 may include grayscale information (or line grayscale data) corresponding to each of the pixel rows PXR1 to PXRn. The data compensator 500 can use the line grayscale data of the previous pixel row (e.g., the p-1 pixel row, where p may be a natural number greater than 1), the line grayscale data of the current pixel row (e.g., the p pixel row), and the line grayscale data of the subsequent pixel row (e.g., the p+1 pixel row) to compensate the line grayscale data of the current pixel row (the p pixel row).

[0064] The data compensator 500 may compensate the input image data DATA1 using one of a first compensation and a second compensation to generate compensated image data DATA2. The image data DATA2 compensated by the first compensation may be data compensated to increase the charge rate of the pixels included in the current pixel row. As an example, the first compensation may be compensation for increasing the magnitude of the data voltage output by the data driver 300 to the current pixel row. As another example, the first compensation may be compensation for decreasing the magnitude of the data voltage output by the data driver 300 to the current pixel row.

[0065] The image data DATA2 compensated by the second compensation may be compensated data for improving crosstalk defects of pixels included in the current pixel row. For example, the second compensation may be compensation for reducing the magnitude of the data voltage output by the data driver 300 to the current pixel row.

[0066] Will refer to it later Figure 3 The detailed configuration and operation of the data compensator 500 are described.

[0067] At the same time, Figure 1 In the embodiment, the timing controller 400 and the data driver 300 are implemented as separate components, but are not limited thereto. For example, the timing controller 400 may be implemented together with the data driver 300 as one integrated circuit (eg, a timing controller embedded driver (TED)).

[0068] In addition, if Figure 1 As shown in , the data compensator 500 may be a component included in the timing controller 400. For example, the data compensator 500 may be implemented as a single integrated circuit together with the timing controller 400, or may be included in the timing controller 400 so that some or all of the data compensator 500 is implemented as software. However, the data compensator 500 is not limited thereto. For example, the data compensator 500 and the timing controller 400 may be implemented as separate components, or may be implemented in a single component.

[0069] Figure 2 The diagram is included in Figure 1 A circuit diagram of an example of a pixel in a display device.

[0070] refer to Figure 2 , the pixel PXij can be connected to the scan line SLi and the data line DLj. Here, the scan line SLi can be Figure 1 One of the scan lines SL1 to SLn, and the data line DLj may be Figure 1 One of the data lines DL1 to DLm.

[0071] The pixel PXij may include a light emitting element LD, a first transistor T1 , a second transistor T2 , and a storage capacitor Cst.

[0072] In this embodiment, although the transistors are shown as N-type transistors (eg, NMOS), those skilled in the art will be able to configure a pixel circuit having the same function using P-type transistors (eg, PMOS).

[0073] The first electrode (eg, anode electrode) of the light emitting element LD may be connected to the first driving voltage line VDDL through the first transistor T1, and the second electrode (eg, cathode electrode) of the light emitting element LD may be connected to the second driving voltage line VSSL. The first driving voltage line VDDL may be a line providing Figure 1 The first driving voltage line VDD, and the second driving voltage line VSSL may be provided Figure 1 A line of the second driving voltage VSS.

[0074] A first electrode of a first transistor T1 (e.g., a driving transistor) may be connected to a first driving voltage line VDDL, and a second electrode of the first transistor T1 may be connected to a first electrode of the light-emitting element LD. A gate electrode of the first transistor T1 may be connected to a first node N1. The first transistor T1 may control the amount of driving current supplied to the light-emitting element LD in response to a voltage at the first node N1.

[0075] A first electrode of the second transistor T2 (switching transistor) may be connected to the data line DLj, and a second electrode of the second transistor T2 may be connected to the first node N1. A gate electrode of the second transistor T2 may be connected to the scan line SLi.

[0076] One electrode of the storage capacitor Cst may be connected to the first node N1, and the other electrode may be connected to the anode electrode of the light emitting diode LD. The storage capacitor Cst may be charged with a voltage corresponding to a data signal of one frame and may maintain the charged voltage until a data signal of the next frame is supplied.

[0077] When a scan signal of a conduction level is supplied to the gate electrode of the second transistor T2 through the scan line SLi, the second transistor T2 can connect the data line DLj to the one electrode of the storage capacitor Cst. Therefore, a voltage difference between the data voltage applied through the data line DLj and the voltage of the anode electrode of the light emitting diode LD can be written to the storage capacitor Cst.

[0078] The first transistor T1 allows a driving current determined by a voltage written to the storage capacitor Cst to flow from the first driving voltage line VDDL to the second driving voltage line VSSL. The light emitting element LD may emit light according to the driving current flowing through the light emitting element LD.

[0079] For ease of description, Figure 2 A pixel circuit of a relatively simple structure is shown, which includes a second transistor T2 for transmitting a data signal to the pixel PXij, a storage capacitor Cst for storing the data signal, and a first transistor T1 for supplying a driving current corresponding to the data signal to the light emitting element LD.

[0080] However, the present disclosure is not limited thereto, and the structure of the pixel circuit may be variously modified and implemented. For example, the pixel circuit may further include various transistors, such as a compensation transistor for compensating for the threshold voltage of the first transistor T1, an initialization transistor for initializing the first node N1 or the anode electrode of the light-emitting element LD, and / or a light emission control transistor for controlling the light emission time of the light-emitting element LD.

[0081] Figure 3 It is used to describe the Figure 1 FIG. 4 is a diagram of a data compensator in a display device. Figure 4 It is used to describe the Figure 3 Figure 1. A diagram of the first driver in the data compensator. Figure 5 is used to describe the Figure 4 A diagram of determination data output by a first determiner in a first driver.

[0082] refer to Figures 3 to 5 The data compensator 500 may receive line grayscale data DR(p-1), DRp, and DR(p+1) (p is a natural number greater than 1) of a previous pixel row, a current pixel row, and a subsequent pixel row through a first input terminal 501, a second input terminal 502, and a third input terminal 503, respectively. Specifically, the first line grayscale data DR(p-1) (or the line grayscale data of the previous pixel row) may be input to the first input terminal 501, the second line grayscale data DRp (or the line grayscale data of the current pixel row) may be input to the second input terminal 502, and the third line grayscale data DR(p+1) (or the line grayscale data of the subsequent pixel row) may be input to the third input terminal 503.

[0083] The first to third line grayscale data DR(p−1), DRp, and DR(p+1) provided to the data compensator 500 through the first to third input terminals 501 , 502 , and 503 may be provided to each of the first and second drivers 510 and 520 .

[0084] The data compensator 500 may include a first driver 510 and a second driver 520 .

[0085] The first driver 510 can generate one of the first activation signal EN1 and the second activation signal EN2 for selecting one of the first compensation and the second compensation based on the first line grayscale data DR(p-1), the second line grayscale data DRp and the third line grayscale data DR(p+1), and can output the generated first activation signal EN1 and the second activation signal EN2 to the second driver 520.

[0086] The second driver 520 may generate compensated grayscale data DRp′ of a current pixel row in response to the first and second activation signals EN1 and EN2 provided from the first driver 510 , and may output the compensated grayscale data DRp′ to the output terminal 504 .

[0087] Hereinafter, configurations included in the first driver 510 and the second driver 520 of the data compensator 500 will be described in detail.

[0088] refer to Figure 4 Together Figure 3 , the first driver 510 may include a first data comparator 511 , a second data comparator 512 , and a compensation determiner 513 .

[0089] The first data comparator 511 may compare the first line grayscale data DR(p-1) with the second line grayscale data DRp to output a first line comparison value DX1.

[0090] Here, the line grayscale data may be data including grayscale data of each pixel in a plurality of pixels included in one pixel row. For example, the first line grayscale data DR(p-1) may include first grayscale data DR1(p-1) to m-th grayscale data DRm(p-1). The first grayscale data DR1(p-1) may be a line connected to the p-1th scan line and the first data line DL1 (reference line DL2). Figure 1 ), and the m-th grayscale data DRm(p-1) may be connected to the p-1-th scan line and the m-th data line DLm (reference Figure 1 )’s grayscale data.

[0091] That is, the first data comparator 511 can respectively compare the first grayscale data DR1(p-1) to the mth grayscale data DRm(p-1) of the first line grayscale data DR(p-1) with the first grayscale data DR1p to the mth grayscale data DRmp of the second line grayscale data DRp to output a first line comparison value DX1.

[0092] The first line comparison value DX1 may include first to m-th grayscale comparison values ​​DX11 to DX1m. For example, the first grayscale comparison value DX11 may be the absolute value of the difference between the first grayscale data DR1(p-1) of the first line grayscale data DR(p-1) and the first grayscale data DR1p of the second line grayscale data DRp, and the m-th grayscale comparison value DX1m may be the absolute value of the difference between the m-th grayscale data DRm(p-1) of the first line grayscale data DR(p-1) and the m-th grayscale data DRmp of the second line grayscale data DRp.

[0093] The second data comparator 512 may compare the second line grayscale data DRp with the third line grayscale data DR(p+1) to output a second line comparison value DX2.

[0094] That is, similar to the first data comparator 511, the second data comparator 512 can respectively compare the first grayscale data DR1p to the mth grayscale data DRmp of the second line grayscale data DRp with the first grayscale data DR1(p+1) to the mth grayscale data DRm(p+1) of the third line grayscale data DR(p+1) to output the second line comparison value DX2.

[0095] The second line comparison value DX2 may include first to m-th grayscale comparison values ​​DX21 to DX2m. For example, the first grayscale comparison value DX21 may be the absolute value of the difference between the first grayscale data DR1p of the second line grayscale data DRp and the first grayscale data DR1(p+1) of the third line grayscale data DR(p+1), and the m-th grayscale comparison value DX2m may be the absolute value of the difference between the m-th grayscale data DRmp of the second line grayscale data DRp and the m-th grayscale data DRm(p+1) of the third line grayscale data DR(p+1).

[0096] The compensation determiner 513 may output one of the first activation signal EN1 and the second activation signal EN2 to the second driver 520 based on the first line comparison value DX1 output from the first data comparator 511 and the second line comparison value DX2 output from the second data comparator 512 .

[0097] Specifically, the compensation determiner 513 may include a first determiner 5131 and a second determiner 5132 .

[0098] The first determiner 5131 may output determination data DS based on the first line comparison value DX1 and the second line comparison value DX2. The first determiner 5131 may compare each of the first line comparison value DX1 and the second line comparison value DX2 with a preset first reference value A, and may output determination data DS based on the comparison result. The determination data DS output from the first determiner 5131 may be provided to the second determiner 5132.

[0099] It can be used for data lines DL1 to DLm (reference Figure 1 ) performs output of the determination data DS. That is, the determination data DS may include first to m-th determination values ​​DS1 to DSm for the corresponding data lines DL1 to DLm. For example, the first determination value DS1 may be a value output by comparing each of the first gray comparison value DX11 of the first line comparison value DX1 and the first gray comparison value DX21 of the second line comparison value DX2 with the first reference value A, and the m-th determination value DSm may be a value output by comparing each of the m-th gray comparison value DX1m of the first line comparison value DX1 and the m-th gray comparison value DX2m of the second line comparison value DX2 with the first reference value A.

[0100] like Figure 5 As shown in FIG, when both the first-line comparison value DX1 and the second-line comparison value DX2 are greater than the first reference value A, the first determiner 5131 may determine that the corresponding data pattern is a trigger pattern and may output a first value as the determination data DS. Alternatively, when both the first-line comparison value DX1 and the second-line comparison value DX2 are less than or equal to the first reference value A, the first determiner 5131 may determine that the corresponding data pattern is a charge rate compensation pattern and may output the first value as the determination data DS. Here, the first value may be 0, but is not limited thereto.

[0101] Alternatively, when only one of the first line comparison value DX1 and the second line comparison value DX2 is greater than the first reference value A, the first determiner 5131 may determine that the corresponding data pattern is a crosstalk-induced pattern and may output a second value as the determination data DS. Here, the second value may be 1, but is not limited thereto.

[0102] The second determiner 5132 may output one of the first activation signal EN1 and the second activation signal EN2 based on the determination data DS provided from the first determiner 5131 .

[0103] Specifically, the second determiner 5132 can sum the first determination value DS1 to the mth determination value DSm included in the determination data DS, compare the sum of the first determination value DS1 to the mth determination value DSm with the preset second reference value B, and can determine to output one of the first activation signal EN1 and the second activation signal EN2.

[0104] For example, among the first determination value DS1 to the mth determination value DSm included in the determination data DS, when the number of first values ​​(or "0") is k (k is an integer equal to or greater than 0 and equal to or less than m), and the number of second values ​​(or "1") is mk, the second determiner 5132 may calculate mk as the sum of the determination data DS. Next, the second determiner 5132 may compare the sum of the determination data DS (e.g., mk) with the second reference value B. When the sum of the determination data DS is equal to or less than the second reference value B (mk≤B), the second determiner 5132 may determine that charging rate compensation is required and may output the first activation signal EN1. When the sum of the determination data DS is greater than the second reference value B (mk>B), the second determiner 5132 may determine that crosstalk compensation is required and may output the second activation signal EN2.

[0105] Next, the second driver 520 may include a first compensator 521 and a second compensator 522 .

[0106] The first compensator 521 can be activated in response to the first activation signal EN1, and can output the first compensation data DRpa of the current pixel row based on the line grayscale data of the current pixel row (e.g., the second line grayscale data DRp) and the line grayscale data of the previous pixel row adjacent to the current pixel row (e.g., the first line grayscale data DR(p-1)).

[0107] The first compensator 521 may include a first lookup table LUT1 in which first compensation data DRpa corresponding to the relationship between the first line grayscale data DR(p-1) and the second line grayscale data DRp is stored.

[0108] The first compensator 521 may perform a first compensation. Here, the first compensation may be compensation for increasing the charge rate of the pixel. As an embodiment, the data voltage corresponding to the first compensation data DRpa output according to the first compensation may be a voltage greater than the data voltage corresponding to the line grayscale data of the current pixel row (e.g., the second line grayscale data DRp). However, the present disclosure is not limited thereto. As another embodiment, when a small data voltage is required to increase the charge rate of the pixel, the data voltage corresponding to the first compensation data DRpa may be a voltage less than the data voltage corresponding to the line grayscale data of the current pixel row (e.g., the second line grayscale data DRp).

[0109] The second compensator 522 can be activated in response to the second activation signal EN2, and can output the second compensation data DRpb of the current pixel row based on the line grayscale data of the current pixel row (e.g., the second line grayscale data DRp) and the line grayscale data of the next pixel row adjacent to the current pixel row (e.g., the third line grayscale data DR(p+1)).

[0110] The second compensator 522 may include a second lookup table LUT2 in which second compensation data DRpb corresponding to the relationship between the second line grayscale data DRp and the third line grayscale data DR(p+1) is stored.

[0111] At the same time, Figure 3 , only the second line grayscale data DRp and the third line grayscale data DR(p+1) are provided to the second compensator 522. However, this is for exemplary description of the line grayscale data being provided, and the present disclosure is not limited thereto. That is, the second lookup table LUT2 of the second compensator 522 may include the second compensation data DRpb corresponding to the relationship between the first line grayscale data DR(p-1) and the second line grayscale data DRp.

[0112] The second compensator 522 may perform second compensation. Here, the second compensation may be compensation for improving a crosstalk defect of the display device. As an embodiment, the data voltage corresponding to the second compensation data DRpb may be a voltage lower than the data voltage corresponding to the line grayscale data of the current pixel row (e.g., the second line grayscale data DRp).

[0113] Figure 6A is a diagram for describing an example of a data voltage compensated by a first compensation of a first compensator. Figure 6B is a diagram for describing an example of a data voltage compensated by the second compensation of the second compensator.

[0114] First, refer to Figure 3 and Figure 6A , the data voltage VD1 may be supplied to any pixel. The first data voltage VD1a may be a data voltage before compensation, and the second data voltage VD1b may be a data voltage after the first compensation.

[0115] The first data voltage VD1a, which is the data voltage before compensation, may be a voltage less than the target data voltage T-VD1 corresponding to the target grayscale. For example, the target data voltage T-VD1 may be a data voltage for emitting pixels at 128 grayscales (G). When the difference between the data voltage supplied to the pixels of the current pixel row and the data voltage supplied to the pixels of the previous pixel row is large, sufficient data voltage may not be supplied to the pixels of the current pixel row, for example, the first data voltage VD1a is less than the target data voltage T-VD1 corresponding to the target grayscale. That is, the first data voltage VD1a may be a data voltage for emitting pixels at a grayscale less than 128 grayscales (instead of 128 grayscales as the target grayscale).

[0116] The first data voltage VD1a can be compensated to the second data voltage VD1b by the first compensation of the first compensator 521. Here, the second data voltage VD1b can be a data voltage corresponding to the first compensation data DRpa and can be a voltage greater than the first data voltage VD1a. The second data voltage VD1b can be a data voltage for emitting a pixel at 128 grayscales, which is a target grayscale. That is, the data voltage can be compensated so that the pixel emits light at the target grayscale through the first compensation, and the charging rate of the pixel can be increased by increasing the data voltage of the pixel.

[0117] Next, refer to Figure 2 、 Figure 3 and Figure 6B , the data voltage VD2 may be provided to any pixel. The first data voltage VDa may be a data voltage before compensation, and the second data voltage VDb may be a data voltage after the second compensation.

[0118] The first data voltage VDa, which is the data voltage before compensation, can be a voltage greater than the target data voltage T-VD2 corresponding to the target grayscale. For example, the target data voltage T-VD2 can be a data voltage for emitting a pixel at 240 grayscale. During the data change period TS, when a data voltage greater than the target data voltage T-VD2 is applied to a pixel, the second drive voltage VSS supplied to the pixel can change. For example, when the first data voltage VDa is applied to the pixel, the second drive voltage VSSa supplied to the pixel can vary significantly, and thus the magnitude of the drive current supplied to the light-emitting element LD can also vary significantly. That is, the light-emitting element LD can emit light at a grayscale different from the target grayscale, and this can be recognized by the user as a crosstalk defect.

[0119] The first data voltage VDa can be compensated to a second data voltage VDb by the second compensation of the second compensator 522. The second data voltage VDb can be a data voltage corresponding to the second compensation data DRpb and can be a voltage lower than the first data voltage VDa. That is, the second data voltage VDb can be a data voltage for emitting a pixel at a grayscale lower than 240 grayscale, which is a target grayscale. When the second data voltage VDb, which is lower than the first data voltage VDa, is applied to the pixel, the variation of the second driving voltage VSSb can be greatly reduced compared to the first data voltage VDa, and the variation of the driving current supplied to the light-emitting element LD can be minimized. That is, the data voltage can be compensated by the second compensation, so that the pixel can emit light at a grayscale lower than the target grayscale, and the crosstalk defect of the display device can be improved.

[0120] Hereinafter, another embodiment of the data compensator will be described. In the following embodiment, the same configuration as in the previous embodiment may be referenced by the same reference numerals, and description thereof will be omitted or simplified.

[0121] Figure 7 is a diagram for describing a data compensator according to another embodiment. Figure 8 It is used to describe the Figure 7 Figure 1. A diagram of the first driver in the data compensator. Figure 9 is used to describe the Figure 8 A diagram of determination data output by a first determiner in a first driver.

[0122] Figures 7 to 9 Examples and Figures 3 to 5 The embodiment of the present invention is different in that the second driver 520_1 further includes a non-compensator 523 activated in response to the third activation signal EN3 of the first driver 510_1. Hereinafter, the difference will be mainly described.

[0123] The data compensator 500_1 may include a first driver 510_1 and a second driver 520_1 .

[0124] The first driver 510_1 can generate one of the first activation signal EN1, the second activation signal EN2 and the third activation signal EN3 for selecting one of the first compensation, the second compensation and the non-compensation based on the first line grayscale data DR(p-1), the second line grayscale data DRp and the third line grayscale data DR(p+1), and can output one of the generated first activation signal EN1, the second activation signal EN2 and the third activation signal EN3 to the second driver 520_1.

[0125] and Figures 3 to 5 Unlike the embodiment, the compensation determiner 513_1 may further output a third activation signal EN3 based on the first line comparison value DX1 and the second line comparison value DX2.

[0126] refer to Figure 8 , the compensation determiner 513_1 may include a first determiner 5131_1 and a second determiner 5132_1.

[0127] The first determiner 5131_1 may output determination data DS based on the first line comparison value DX1 and the second line comparison value DX2. The first determiner 5131_1 may compare each of the first line comparison value DX1 and the second line comparison value DX2 with a preset first reference value A and may output determination data DS based on the comparison result. The determination data DS output from the first determiner 5131_1 may be provided to the second determiner 5132_1.

[0128] In this embodiment, Figures 3 to 5 Different from the embodiment, the output of the determination data DS of the first determiner 5131_1 can be further subdivided. Figure 9 As shown in , the first determiner 5131_1 can further compare the first line comparison value DX1 and the second line comparison value DX2 with 0, and can perform determination by subdividing the output into a case where the first line comparison value DX1 and the second line comparison value DX2 are greater than 0 and less than or equal to the first reference value A and a case where the first line comparison value DX1 and the second line comparison value DX2 are 0.

[0129] For example, when the first line comparison value DX1 is 0, when the second line comparison value DX2 is greater than the first reference value A, the first determiner 5131_1 can output the second value (or "1") as the determination data DS; when the second line comparison value DX2 is greater than 0 and less than or equal to the first reference value A, the first determiner 5131_1 can output the first value (or "0") as the determination data DS.

[0130] In addition, when the second line comparison value DX2 is 0, when the first line comparison value DX1 is greater than the first reference value A, the first determiner 5131_1 can output the second value as the determination data DS; when the first line comparison value DX1 is greater than 0 and less than or equal to the first reference value A, the first determiner 5131_1 can output the first value as the determination data DS.

[0131] Meanwhile, when both the first-line comparison value DX1 and the second-line comparison value DX2 are 0, the first determiner 5131_1 may output a non-compensation signal NC. The situation in which both the first-line comparison value DX1 and the second-line comparison value DX2 are 0 may mean that there is no data change (or data difference) in the previous pixel row and the subsequent pixel row adjacent to the current pixel row. That is, since the data of the pixels in the adjacent pixel rows are the same, data compensation may not be required, and for this reason, the non-compensation signal NC may be output as the determination data DS.

[0132] The second determiner 5132_1 may output one of the first activation signal EN1, the second activation signal EN2, and the third activation signal EN3 based on the determination data DS provided from the first determiner 5131_1. At this time, the second determiner 5132_1 may count the number of non-compensation signals NC included in the determination data DS. When the number of non-compensation signals NC and the data lines DL1 to DLm (reference Figure 1) are the same as each other, the second determiner 5132_1 may output the third activation signal EN3. That is, the output of the third activation signal EN3 may correspond to a case in which all of the first determination value DS1 to the mth determination value DSm of the determination data DS are output as the non-compensation signal NC.

[0133] The second driver 520_1 may further include a non-compensator 523. The non-compensator 523 may be activated corresponding to the third activation signal EN3 and may output line grayscale data (eg, second line grayscale data DRp) of a current pixel row as it is without compensation.

[0134] As described above, when the second driver 520_1 further includes the non-compensator 523 that outputs the line grayscale data of the current pixel row as it is, the data voltage can be prevented from being unnecessarily compensated, and the power consumption of the display device can be reduced.

[0135] Although the embodiments of the present disclosure have been described with reference to the accompanying drawings, those skilled in the art will appreciate that the embodiments can be implemented in other specific forms without changing the technical spirit and essential features of the present disclosure. Therefore, it should be understood that the embodiments described above are illustrative in all aspects and not restrictive.

Claims

1. A display device, comprising: a plurality of pixel rows, each pixel row comprising a plurality of pixels; a data driver configured to supply a first data voltage corresponding to first-line grayscale data to pixels disposed in an N-1th pixel row, supply a second data voltage corresponding to second-line grayscale data to pixels disposed in an Nth pixel row, and supply a third data voltage corresponding to third-line grayscale data to pixels disposed in an N+1th pixel row, where N is a natural number greater than 2; as well as a data compensator configured to compensate the second line grayscale data by using one of a first compensation and a second compensation different from the first compensation based on the first line grayscale data, the second line grayscale data, and the third line grayscale data, wherein the data driver provides the compensated second data voltage to the N-th pixel row based on the compensated grayscale data in which the second line grayscale data is compensated, Through the first compensation, the second line grayscale data is compensated so that a data voltage greater than a data voltage corresponding to the second line grayscale data is output, and Through the second compensation, the second line grayscale data is compensated so that a data voltage smaller than the data voltage corresponding to the second line grayscale data is output.

2. The display device according to claim 1, wherein The data compensator includes: a first driver configured to output one of a first activation signal and a second activation signal for selecting the one of the first compensation and the second compensation based on the first line grayscale data, the second line grayscale data, and the third line grayscale data; and The second driver is configured to output the compensated grayscale data in response to the one of the first activation signal and the second activation signal.

3. The display device according to claim 2, wherein The first driver includes: a first data comparator configured to compare the first line grayscale data with the second line grayscale data to output a first line comparison value; a second data comparator configured to compare the second-line grayscale data with the third-line grayscale data to output a second-line comparison value; and A compensation determiner is configured to output the one of the first activation signal and the second activation signal based on the first line comparison value and the second line comparison value.

4. The display device according to claim 3, wherein The compensation determiner comprises: a first determiner configured to output determination data based on the first line comparison value and the second line comparison value; and The second determiner is configured to output the one of the first activation signal and the second activation signal based on the determination data.

5. The display device according to claim 4, wherein The first determiner compares each of the first line comparison value and the second line comparison value with a preset first reference value, The first determiner outputs a first value as the determination data when both the first line comparison value and the second line comparison value are greater than or less than the first reference value, and The first determiner outputs a second value as the determination data when only one of the first line comparison value and the second line comparison value is greater than the first reference value. The display device according to claim 5 , wherein: The second determiner compares the sum of the determination data with a preset second reference value, When the sum of the determination data is less than or equal to the second reference value, the second determiner outputs the first activation signal, and The second determiner outputs the second activation signal when the sum of the determination data is greater than the second reference value.

7. The display device according to claim 3, wherein When all of the first line grayscale data, the second line grayscale data, and the third line grayscale data are the same, the first driver outputs a third activation signal, and The second driver outputs the second line grayscale data as it is in response to the third activation signal.

8. The display device according to claim 2, wherein The second driver includes: a first compensator configured to output first compensation data using the first compensation in response to the first activation signal; and a second compensator configured to output second compensation data using the second compensation in response to the second activation signal, and The second driver outputs one of the first compensation data and the second compensation data as the compensated grayscale data.

9. The display device according to claim 8, wherein The second data voltage corresponding to the first compensation data is greater than the data voltage corresponding to the second line grayscale data, and The first compensator includes a first lookup table storing therein the first compensation data corresponding to the relationship between the first line grayscale data and the second line grayscale data.

10. The display device according to claim 8, wherein The second data voltage corresponding to the second compensation data is smaller than the data voltage corresponding to the second line grayscale data, and The second compensator includes a second lookup table storing therein the second compensation data corresponding to the relationship between the first line grayscale data and the second line grayscale data.

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