Display device

Abstract

A display device is provided. The display device includes: an over-driver that over-drives current frame data included in input image data to output over-driven frame data; a data driver that generates a data signal for the current frame data based on the over-driven frame data; and a display panel including a plurality of pixels that receive the data signal. The over-driver may calculate a temporal change rate or a spatial change rate of the input image data, and output the over-driven frame data using a reference formula having a first main parameter determined according to the calculation result. Therefore, over-driving can be dynamically performed according to the spatial change rate or the temporal change rate of the input image data.

Description

[0001] This application claims the priority and benefit of Korean Patent Application No. 10-2020-0010044, filed on Jan. 28, 2020, the entire contents of which are incorporated herein by reference. Technical Field

[0002] Embodiments of the present disclosure relate to a display device, and more particularly, to a display device and a method of driving the display device. Background Art

[0003] With the development of information technology, the importance of a display device as a connection medium between a user and information has been emphasized. In response thereto, the use of display devices (such as liquid crystal display devices, organic light emitting display devices, and plasma display devices) has been increasing.

[0004] In a display device, each pixel may emit light having a luminance corresponding to a data voltage supplied through a data line. The display device may display an image frame by combining the light emitted from the pixels.

[0005] When the response speed of the display device is slow, an afterimage in which a previous screen (e.g., a previous image frame) and a new screen (e.g., a new image frame) overlap each other or motion blur may occur when displaying content that changes or moves rapidly.

[0006] For example, the time taken to switch from the darkest color to the lightest color or the time taken to switch from a mixed color to a neutral color may be slow. Summary of the Invention

[0007] Aspects of embodiments of the present disclosure relate to a display device and a method of driving the display device, the display device being capable of performing overdriving based on set or predetermined parameters according to a temporal change rate or a spatial change rate of input image data.

[0008] However, aspects of the present disclosure are not limited to the above aspects, and other aspects within the spirit and scope of the present disclosure will be apparent to those of ordinary skill in the relevant art.

[0009] One embodiment of the present disclosure for implementing the above aspects provides a display device.

[0010] The display device may include: an overdriver that overdrives current frame data included in input image data to output overdriven frame data for the current frame data; a data driver that generates a data signal based on the overdriven frame data; and a display panel including a plurality of pixels that receive the data signal.

[0011] The overdriver can calculate the temporal change rate or the spatial change rate of the input image data to obtain a calculation result, and output overdrive frame data using a reference formula that has a first main parameter determined according to the calculation result.

[0012] The overdriver can output first overdrive frame data for input image data including a first temporal change rate and a first spatial change rate, and output second overdrive frame data different from the first overdrive frame data for input image data including a second temporal change rate equal to the first temporal change rate and a second spatial change rate higher than the first spatial change rate.

[0013] The reference formula can be a formula in which the difference between the overdrive frame data and the previous frame data of the current frame data is expressed as a polynomial of the current frame data.

[0014] The overdriver can include a memory that stores the main parameters of the reference formula and at least one auxiliary parameter for the first main parameter among the main parameters.

[0015] The previous frame data is DPF, the current frame data is DCF, the overdrive frame data is DOF, and the main parameters are A, B, C, and D, where B is the first main parameter. The reference formula can be as follows:

[0016] DOF - DPF = A·DCF 3 + B·DCF 2 + C·DCF + D.

[0017] The overdriver can use the at least one auxiliary parameter to determine a linear approximation function, and wherein the overdriver can input the temporal change rate or the spatial change rate into the linear approximation function to determine the first main parameter.

[0018] The linear approximation function can be a function obtained by determining multiple reference formulas using data extracted from multiple sample patterns and linearly approximating the first main parameter according to the multiple reference formulas.

[0019] The multiple sample patterns can include: a first sample pattern in which black gray levels (black gray levels) and white gray levels (white gray levels) alternate two or more times in each of a first direction and a second direction perpendicular to the first direction in one frame; a second sample pattern in which black gray levels and white gray levels alternate at least once in each of the first direction and the second direction in one frame; and a third sample pattern having a single gray level (single gray level) in one frame.

[0020] The first sample pattern can include a region that changes from a black gray level to a white gray level or from a white gray level to a black gray level after one frame interval.

[0021] The second sample pattern may include an area that changes from a black gray level to a white gray level or from a white gray level to a black gray level after a two-frame interval.

[0022] The third sample pattern may include an area that changes from a black gray level to a white gray level or from a white gray level to a black gray level after a three-frame interval.

[0023] The overdriver may determine a shift degree of a reference formula based on current frame data and previous frame data, and output overdrive frame data using a shifted reference formula obtained by shifting the reference formula according to the shift degree.

[0024] The reference formula may satisfy at least one of default data, and the default data may include: first default data corresponding to a case where gray level values of current frame data, previous frame data, and overdrive frame data are the same; and second default data corresponding to a case where the gray level value of the current frame data is the maximum gray level value.

[0025] The previous frame data of the data satisfying the reference formula may have a constant gray level value.

[0026] Another embodiment of the present disclosure for implementing the above aspects provides a method for driving a display device.

[0027] The method for driving a display device may include the following steps: calculating a temporal change rate or a spatial change rate of input image data to obtain a calculation result; determining a first main parameter based on the calculation result; determining a reference formula having the first main parameter; and generating overdrive frame data for current frame data included in the input image data using the reference formula.

[0028] The reference formula may be a formula in which a difference between overdrive frame data and previous frame data of current frame data is expressed as a polynomial of the current frame data.

[0029] The previous frame data is DPF, the current frame data is DCF, the overdrive frame data is DOF, and main parameters of the reference formula are A, B, C, and D, where B is the first main parameter, and the reference formula may be as follows:

[0030] DOF - DPF = A·DCF 3 + B·DCF 2 + C·DCF + D.

[0031] The step of determining the first main parameter may include: determining a linear approximation function using at least one auxiliary parameter stored in a memory; and determining the first main parameter by inputting the temporal change rate or the spatial change rate into the linear approximation function.

[0032] The linear approximation function may be a function obtained by determining a plurality of reference formulas using data extracted from a plurality of sample patterns and linearly approximating a first main parameter according to the plurality of reference formulas.

[0033] The step of generating over-driven frame data may include: determining a degree of movement of a reference formula based on current frame data and previous frame data; and generating over-driven frame data using a shifted reference formula obtained by shifting the reference formula according to the degree of movement.

[0034] The reference formula may satisfy at least one of default data, and the default data may include: first default data corresponding to a case where gray level values of current frame data, previous frame data, and over-driven frame data are the same; and second default data corresponding to a case where the gray level value of current frame data is a maximum gray level value.

[0035] The step of generating over-driven frame data may include: outputting first over-driven frame data for current frame data included in input image data having a first spatial change rate and a first temporal change rate; and outputting second over-driven frame data different from the first over-driven frame data for current frame data included in input image data having a second temporal change rate equal to the first temporal change rate and a second spatial change rate higher than the first spatial change rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings illustrate example embodiments of the present disclosure and, together with the description, are used to explain the principles of the present disclosure. The drawings are included to provide a further understanding of the present disclosure and are incorporated in this specification and constitute a part of this specification.

[0037] Figure 1 is a block diagram showing a display device according to an embodiment of the present disclosure.

[0038] Figure 2 is a conceptual diagram for explaining a schematic operation of an over driver according to an embodiment of the present disclosure.

[0039] Figure 3 is an example diagram showing a sample pattern for pre-specifying parameters to define a reference formula according to an embodiment of the present disclosure.

[0040] Figure 4 is a graph showing a reference formula having a main parameter according to an embodiment of the present disclosure.

[0041] Figure 5 is a graph showing a reference formula that changes as one of the main parameters changes according to an embodiment of the present disclosure.

[0042] Figure 6 It is a graph showing a linear approximation for determining a first main parameter according to an embodiment of the present disclosure.

[0043] Figure 7 It is a conceptual diagram for explaining the concept of mobility of a reference formula according to an embodiment of the present disclosure.

[0044] Figure 8 It is a flowchart showing a method of driving a display device according to an embodiment of the present disclosure. Detailed Description of the Invention

[0045] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings, so that those of ordinary skill in the art can implement the present disclosure. The present disclosure can be implemented in various suitable forms and is not limited to the embodiments described herein. As used herein, when describing embodiments of the present disclosure, the use of the term "may" refers to "one or more embodiments of the present disclosure".

[0046] To clearly describe the present disclosure, parts not related to the description may not be described. Throughout the specification, the same reference numerals are used for the same or similar elements. Therefore, the reference numerals may be used in other drawings.

[0047] In addition, for ease of description, the size and thickness of each component shown in the drawings may be exaggerated. The present disclosure is not limited to the embodiments shown in the drawings. In the drawings, the thickness may be exaggerated to clearly show different layers and regions. As used herein, the term "and / or" includes any combination and all combinations of one or more of the related listed items.

[0048] As used herein, the terms "substantially", "about", "approximately" and similar terms are used as approximate terms and not as degree terms, and are intended to explain the inherent deviations in measured or calculated values that would be recognized by those of ordinary skill in the art.

[0049] Figure 1 It is a block diagram showing a display device according to an embodiment of the present disclosure.

[0050] Referring to Figure 1 , the display device DD may include an over-driver 100, a timing controller 200, a scan driver 300, a transmit driver 400, a data driver 500, a display panel 600, and a power manager 700.

[0051] The over-driver 100 may receive input image data IPdata provided from the timing controller 200, and may over-drive the received input image data IPdata to output over-drive data ODdata.

[0052] Overdrive may refer to a method in which a voltage slightly higher (or in some cases slightly lower) than the required voltage level is applied instantaneously or substantially instantaneously (e.g., during one frame period) to pixel PX[i,j], and then the voltage is reduced to the required target voltage (e.g., the required voltage). Overdrive is a technique for improving the response speed of display device DD and may include dynamic capacitance compensation (DCC).

[0053] As an example of overdrive, when a driving voltage higher than the driving voltage of pixel PX[i,j] according to input image data IPdata is applied to pixel PX[i,j], the response speed of display device DD can be improved due to the overshoot effect.

[0054] Overdriver 100 can generate overdrive data ODdata by changing the gray level value of input image data IPdata. For example, overdriver 100 can analyze the temporal change rate (e.g., the temporal frequency of the gray level value) or the spatial change rate (e.g., the spatial frequency of the gray level value) of input image data IPdata, and convert input image data IPdata according to a reference formula corresponding to the analysis result (e.g., the result of overdriver 100 analyzing the spatial change rate or the temporal change rate) to output overdrive data ODdata (e.g., to generate overdrive data ODdata and then output overdrive data ODdata).

[0055] Timing controller 200 can generate a scan control signal SCS, an emission control signal ECS, and a data control signal DCS in response to a synchronization signal supplied from the outside. The scan control signal SCS can be supplied to scan driver 300, the emission control signal ECS can be supplied to emission driver 400, and the data control signal DCS can be supplied to data driver 500. In addition, timing controller 200 can supply the overdrive data ODdata supplied from overdriver 100 to data driver 500 as image data RGB, or can modify (e.g., rearrange) the overdrive data ODdata and supply the modified (e.g., rearranged) overdrive data to data driver 500.

[0056] The scan control signal SCS can include a scan start signal and a clock signal. The first scan start signal can control the first timing of the scan signal. The clock signal can be used to shift the scan start signal (e.g., the first scan start signal).

[0057] The emission control signal ECS can include an emission start signal and a clock signal. The emission start signal can control the first timing of the emission signal. The clock signal can be used to shift the emission start signal.

[0058] The data control signal DCS may include a source start pulse and a clock signal. The source start pulse may control the start point of data sampling. The clock signal may be used to control the sampling operation.

[0059] The scan driver 300 may receive a scan control signal SCS from the timing controller 200, and may sequentially supply scan signals to the scan lines SL[1], SL[2],..., and SL[p] based on the scan control signal SCS. When sequentially supplying the scan signals, pixels PX[i,j] may be selected in units of horizontal lines (or in units of pixel rows), and data signals (or data voltages) may be supplied to the selected pixels PX[i,j].

[0060] The scan driver 300 may include scan stages composed of shift registers. The scan driver 300 may generate scan signals by sequentially transmitting a scan start signal (e.g., a first scan start signal) in the form of a conductive level pulse to the next scan stage under the control of the clock signal. For example, as the scan start signal (e.g., the first scan start signal) is sequentially transmitted to the scan stages, scan signals may be sequentially generated and supplied to the scan lines SL[1] to SL[p].

[0061] The emission driver 400 may receive an emission control signal ECS from the timing controller 200, and may sequentially supply emission signals to the emission control lines EL[1], EL[2],..., and EL[p] based on the emission control signal ECS. The emission signals may be used to control the emission time of the pixels PX[i,j]. To this end, the emission signals may be set to have a width wider than that of the scan signals. For example, the time during which the emission signals are supplied to the emission control lines EL[1] to EL[p] may be longer than the time during which the scan signals are supplied to the scan lines SL[1] to SL[p].

[0062] The data driver 500 may receive a data control signal DCS and image data RGB from the timing controller 200. Here, the image data RGB may be the same as the overdrive data ODdata of the overdriver 100 (e.g., received from the overdriver 100), or the image data RGB may be data obtained by modifying (e.g., converting or rearranging) the overdrive data ODdata.

[0063] The data driver 500 can generate data signals based on overdrive data ODdata (e.g., based on image data RGB), and can supply the data signals (or data voltages) to data lines DL[1], DL[2], ……, and DL[q] in response to data control signals DCS. The data signals supplied to data lines DL[1], DL[2], ……, and DL[q] can be supplied to pixels PX[i,j] selected by scan signals. To this end, the data driver 500 can supply data signals to data lines DL[1], DL[2], ……, and DL[q] in synchronization with scan signals.

[0064] The display panel 600 can include a plurality of pixels PX[i,j]. The plurality of pixels PX[i,j] can be arranged in p rows and q columns, where p and q are natural numbers. The pixels PX[i,j] set in the same row can be connected to the same scan line SL[i] and the same emission control line EL[i]. In addition, the pixels PX[i,j] set in the same column can be connected to the same data line DL[j].

[0065] For example, the pixel PX[i,j] set in the i-th row and the j-th column can be connected to the scan line SL[i] corresponding to the i-th row (or the i-th horizontal line), the emission control line EL[i] corresponding to the i-th row, and the data line DL[j] corresponding to the j-th column.

[0066] The power manager 700 can supply the voltage of the first power supply VDD, the voltage of the second power supply VSS, and the voltage of the initialization power supply Vint to the display panel 600. However, this is an example, and at least one selected from the voltage of the first power supply VDD, the voltage of the second power supply VSS, and the voltage of the initialization power supply Vint can be supplied to the display panel 600 from the timing controller 200 or the data driver 500.

[0067] The first power supply VDD and the second power supply VSS can generate voltages for driving each pixel PX[i,j] of the display panel 600. In an embodiment, the voltage of the second power supply VSS can be lower than the voltage of the first power supply VDD. For example, the voltage of the first power supply VDD can be a positive voltage, while the voltage of the second power supply VSS can be a negative voltage. The initialization power supply Vint can be a power supply for initializing each pixel PX[i,j] included in the display panel 600.

[0068] Figure 1The overdriver 100 is shown as receiving input image data IPdata from the timing controller 200, but the present disclosure is not limited thereto. For example, the overdriver 100 may be integrally implemented inside the timing controller 200. In this case, the timing controller 200 may receive input image data IPdata from the outside and generate overdrive data ODdata using the received input image data IPdata.

[0069] Figure 2 is a conceptual diagram for explaining the schematic operation of an overdriver according to an embodiment of the present disclosure.

[0070] The input image data IPdata may include current frame data DCF and previous frame data DPF of the current frame data DCF (e.g., the previous frame data DPF before the current frame data DCF). Here, the previous frame data DPF is frame data that is earlier in time than the current frame data DCF, and the previous frame data DPF may include at least one previous frame data that is adjacent to the current frame data DCF in time (e.g., at least one previous frame data that is just before the current frame data DCF in time). The current frame data DCF and / or the previous frame data DPF may include the grayscale value of each pixel PX[i,j].

[0071] In addition, the overdrive data ODdata may include at least one overdrive frame data DOF corresponding to each frame data of the input image data IPdata.

[0072] The overdriver 100 may generate an overdrive frame data DOF for the current frame data DCF using the current frame data DCF and at least one previous frame data DPF. For example, the overdrive frame data DOF may be used (e.g., temporarily used) to adjust (e.g., temporarily adjust) the data signal supplied to the pixel PX[i,j].

[0073] The overdriver 100 may include a memory 120 that stores set or predetermined main parameters and auxiliary parameters for at least one of the main parameters to be selected from among the main parameters.

[0074] The overdriver 100 may determine a reference formula RF (see Figure 7 ) by referring to the parameters previously stored in the memory 120, and may generate an overdrive frame data DOF for the current frame data DCF using the determined reference formula RF.

[0075] The reference formula RF may be a formula in which the difference between the overdrive frame data DOF and the previous frame data DPF is expressed as a polynomial of the current frame data DCF. For example, the reference formula RF may be defined as Equation 1 below.

[0076] Equation 1

[0077] DOF - DPF = A·DCF 3 + B·DCF 2 + C·DCF + D

[0078] Referring to Equation 1, DOF can be the overdriven frame data (or the gray - level value of the overdriven frame data), DPF can be the previous frame data (or the gray - level value of the previous frame data), DCF can be the current frame data (or the gray - level value of the current frame data), and A, B, C, and D can be appropriate main parameters (e.g., integers).

[0079] Therefore, when the main parameters A, B, C, and D are accurately (e.g., appropriately) specified (e.g., set) and the current frame data DCF and the previous frame data DPF are obtained from the input image data IPdata, the overdriven frame data DOF can be determined by Equation 1 above.

[0080] In addition, in order to specify (e.g., set or define) all the main parameters A, B, C, and D, a pair of the previous frame data DPF and the current frame data DCF corresponding to the number of the main parameters A, B, C, and D and the overdriven frame data DOF applicable to (e.g., corresponding to) the pair may be required (e.g., utilized).

[0081] In this case, all or some of the main parameters A, B, C, and D for defining the reference formula RF can be pre - stored in the memory 120. In addition, the auxiliary parameters α and β for defining at least one main parameter (e.g., B) selected from the main parameters A, B, C, and D can be pre - stored in the memory 120.

[0082] Here, the memory 120 can include at least one selected from a read - only memory ROM and a random - access memory RAM (e.g., consist of at least one selected from a read - only memory ROM and a random - access memory RAM).

[0083] Hereinafter, a method for determining the main parameters A, C, and D and the auxiliary parameters α and β stored in the memory 120 will be described.

[0084] Figure 3 is an example diagram showing a sample pattern for pre - specifying (e.g., setting) parameters for defining a reference formula according to an embodiment of the present disclosure.

[0085] As described above, in order to set or preset main parameters A, B, C, and D and store the main parameters A, B, C, and D in the memory 120, it may be necessary to use (e.g., utilize) a pair of previous frame data DPF and current frame data DCF corresponding to the number of main parameters A, B, C, and D, and over-drive frame data DOF applicable to (e.g., corresponding to) the pair.

[0086] Therefore, in an embodiment of the present disclosure, the over-drive frame data DOF for frame data (e.g., current frame data DCF and previous frame data DPF) for multiple sample patterns CASE 1, CASE 2, and CASE 3 may be determined and utilized in advance. Here, the over-drive frame data DOF may be determined based on a change in the device characteristics of the display device DD or according to a change in the gray level value of the data voltage applied to the pixel PX[i,j].

[0087] Here, the multiple sample patterns CASE 1, CASE 2, and CASE 3 may be image data having at least two or more frames.

[0088] The first sample pattern CASE 1 may be a pattern image having the highest temporal change rate. For example, the first sample pattern CASE 1 may have a pattern in which the gray level changes from black to white (or from white to black) in each frame from the first frame 1frame to the fourth frame 4frame (e.g., from the first frame 1frame, the second frame 2frame, the third frame 3frame up to the fourth frame 4frame). For example, the first sample pattern CASE 1 may be a pattern including an area (such as one or more pixels PX[i,j]) in which the pattern changes from black to white (or from white to black) in each frame from the first frame 1frame to the fourth frame 4frame.

[0089] In addition, the first sample pattern CASE 1 may be a pattern image having the highest spatial change rate. For example, the first sample pattern CASE 1 may be a pattern in which the black and white gray levels alternate two or more times in the first direction DR1 in one frame. In addition, the first sample pattern CASE 1 may be a pattern in which the black and white gray levels alternate two or more times in the second direction DR2 perpendicular to the first direction DR1 in one frame. For example, the first sample pattern CASE 1 may be a pattern including a plurality of regions arranged along the first direction DR1 and the second direction DR2, where the gray level values of the plurality of regions alternate between black and white gray levels two or more times in each of the first direction DR1 and the second direction DR2.

[0090] The second sample pattern CASE 2 can be a pattern image having a temporal rate of change smaller than that of the first sample pattern CASE 1. For example, the second sample pattern CASE 2 can have a pattern that changes from a black gray level to a white gray level (or from a white gray level to a black gray level) every two frames from the first frame 1frame to the fourth frame 4frame. Additionally, the second sample pattern CASE 2 can be a pattern image having a spatial rate of change smaller than that of the first sample pattern CASE 1. For example, the second sample pattern CASE 2 can be a pattern in which the black gray level and the white gray level alternate more than once in the first direction DR1 within one frame. Additionally, the second sample pattern CASE 2 can be a pattern in which the black gray level and the white gray level alternate more than once in the second direction DR2 within one frame.

[0091] The third sample pattern CASE 3 can be a pattern image having a temporal rate of change smaller than that of the second sample pattern CASE 2. For example, the third sample pattern CASE 3 can have a pattern that changes from a black gray level to a white gray level (or from a white gray level to a black gray level) every three frames from the first frame 1frame to the fourth frame 4frame. Additionally, the third sample pattern CASE 3 can be a pattern image having a spatial rate of change smaller than that of the second sample pattern CASE 2. For example, the third sample pattern CASE 3 can have a single gray level (white gray level or black gray level) within one frame.

[0092] As described above, multiple sample patterns having different (sequentially increasing or decreasing) temporal or spatial rates of change can be selected, and the main parameters for the reference formula RF can be predetermined using the selected sample patterns.

[0093] Figure 4 is a graph showing a reference formula having main parameters according to an embodiment of the present disclosure.

[0094] The main parameters A, B, C, and D of the reference formula RF, or some of A, B, C, and D (e.g., A, C, and D), can be determined using data whose quantity corresponds to the order of the polynomial. For example, when the reference formula RF is a third-order polynomial as in Equation 1 above, the main parameters A, B, C, and D of the reference formula RF can be determined by applying four data P1, P2, P3, and P4 to Equation 1. For example, the main parameters A, B, C, and D can represent the coefficients of the polynomial of Equation 1, and thus, the main parameters A, B, C, and D can be obtained after determining the reference formula RF of Equation 1.

[0095] For example, two default data (e.g., two data points among the data points that satisfy the reference formula RF and meet the set conditions or parameters) and at least two data extracted from one of the multiple sample patterns according to Figure 3 can be used to determine (e.g., by applying the two default data and the at least two data to Equation 1) some of the main parameters A, B, C, and D of the reference formula RF, such as A, C, and D.

[0096] Refer to Figure 4 , in the curve graph, a first reference formula RF1 with main parameters obtained by applying the default data P1 and P2 and two data P3 and P4 extracted from the first sample pattern CASE 1 to Equation 1 is shown.

[0097] For example, in the first sample pattern CASE 1, when the previous frame data DPF is a gray level value of 64 and the current frame data DCF is a gray level value of 128, the third data P3 can be extracted by determining the overdrive frame data DOF as a gray level value of 160. Additionally, in the first sample pattern CASE 1, when the previous frame data DPF is a gray level value of 64 and the current frame data DCF is a gray level value of 192, the fourth data P4 can be extracted by determining the overdrive frame data DOF as a gray level value of 224 (160 + 64).

[0098] In addition, the default data can be defined as the data according to the case where overdrive is not performed.

[0099] For example, when the current frame data DCF and the previous frame data DPF are the same and the gray level value does not change, overdrive may not be necessary. Therefore, in this case, the overdrive frame data DOF can be the same as the current frame data DCF. For example, when the current frame data DCF, the previous frame data DPF, and the overdrive frame data DOF are the same (e.g., substantially the same), the data can be shown in the Figure 4 curve graph as the data with the y-axis (DOF - DPF) being 0. For example, the first data P1 can refer to the data according to the case where the gray level values of the current frame data DCF, the previous frame data DPF, and the overdrive frame data DOF are all 64 (e.g., substantially 64). As described above, the data for the case where the gray level values of the current frame data DCF, the previous frame data DPF, and the overdrive frame data DOF are equal to each other (e.g., like the gray level value of the first data P1, 64) can be defined as the first default data.

[0100] When the current frame data DCF is the maximum (e.g., substantially the maximum) gray level value that can be expressed by the display device DD (e.g., as Figure 4When the over-driven frame data DOF higher than the current frame data DCF is not applied when the value is 255 as shown in []. For example, the second data P2 may refer to data in a case where the gray level value according to the current frame data DCF is the maximum (e.g., substantially the maximum) gray level value. As described above, among the data satisfying the reference formula RF, the data in the case where the gray level value of the current frame data DCF is the maximum gray level value can be defined as the second default data.

[0101] As in Figure 4 In the first reference formula RF1 shown in [], the reference formula may be a formula in which the difference between the over-driven frame data DOF and the previous frame data DPF is expressed as a polynomial (e.g., a polynomial of the current frame data DCF). Therefore, it is difficult to specify the previous frame data DPF and the over-driven frame data DOF separately.

[0102] To solve this problem, in an embodiment of the present disclosure, the previous frame data DPF of the data satisfying the reference formula RF may have a constant gray level value. For example, in Figure 4 In the curve of the first reference formula RF1 shown in [], the previous frame data DPF for the first data P1, the second data P2, the third data P3, and the fourth data P4 may all have a gray level value of 64. For example, Figure 4 The curve graph of the first reference formula RF1 shown in [] may be a curve that can determine the current frame data DCF and the over-driven frame data DOF based on the specified (e.g., set) previous frame data DPF.

[0103] Meanwhile, in an embodiment of the present disclosure, one of the main parameters (e.g., B) may be dynamically determined according to the temporal change rate or the spatial change rate of the input image data IPdata. This will be described in more detail below.

[0104] Figure 5 is a curve graph showing a reference formula that changes as one of the main parameters changes according to an embodiment of the present disclosure.

[0105] Referring to Figure 4 In the first reference formula RF1 shown in [], the first reference formula RF1 may include two default data P1 and P2 and two data P3 and P4 extracted from the first sample pattern CASE 1. In this case, when the two default data P1 and P2 are maintained and two data extracted from different sample patterns are used, the reference formulas RF2 and RF3 can be determined additionally as shown in the curve graph of Figure 5 For example, the two default data P1 and P2 may be data points that satisfy each of the reference formulas RF1, RF2, and RF3.

[0106] Referring to Figure 5, the second reference formula RF2 determined using two default data (e.g., P1 and P2) and two data P5 and P6 extracted from the second sample pattern CASE 2, and the third reference formula RF3 determined using two default data (e.g., P1 and P2) and two data P7 and P8 extracted from the third sample pattern CASE 3 are shown as curves.

[0107] In this case, the first reference formula RF1, the second reference formula RF2, and the third reference formula RF3 can satisfy Figure 4 the first default data (e.g., the first data P1) and the second default data (e.g., the second data P2) shown in. For example, the fifth data P5 and the sixth data P6 that satisfy the second reference formula RF2 can be the data when the current frame data DPF is the gray level value of 64. Additionally, the seventh data P7 and the eighth data P8 that satisfy the third reference formula RF3 can be the data when the current frame data DPF is the gray level value of 64. For example, the previous frame data DPF of the data that satisfies each of the reference formulas RF2 and RF3 can have a constant gray level value of 64.

[0108] The second reference formula RF2 and the third reference formula RF3 satisfy Equation 1 as well as the first reference formula RF1, but the first main parameter (e.g., B) among the main parameters A, B, C, and D can be different from each other. For example, the main parameters of the first reference formula RF1 can be A, B, C, and D, the main parameters of the second reference formula RF2 can be A, B', C, and D, and the main parameters of the third reference formula RF3 can be A, B", C, and D.

[0109] In summary, since the first main parameter (e.g., B) is determined differently according to the sample pattern used for data extraction, when using the sample pattern to determine the function for determining the first main parameter B, the first main parameter B can be dynamically determined according to the input image data IPdata.

[0110] Figure 6 is a curve diagram showing the linear approximation for determining the first main parameter according to an embodiment of the present disclosure.

[0111] As a method for determining the first main parameter (e.g., B), the relationship between sample patterns can be utilized.

[0112] In Figure 6 the curve diagram shown, the horizontal axis represents the time change rate or the space change rate numerically, and the vertical axis represents the first main parameters B, B', and B" for the first reference formula RF1, the second reference formula RF2, and the third reference formula RF3.

[0113] As a method for numerically converting the temporal change rate or the spatial change rate of a sample pattern, various suitable frequency conversion methods including the discrete cosine transform (DCT) can be used.

[0114] Since Figure 3 the sample patterns CASE 1, CASE 2, and CASE 3 shown in have sample patterns in which the temporal change rate or the spatial change rate increases or decreases sequentially, the first main parameters B, B', and B" of the reference formulas RF1, RF2, and RF3 can increase or decrease linearly according to the temporal change rate or the spatial change rate.

[0115] Therefore, the first main parameters B, B', and B" for the reference formulas RF1, RF2, and RF3 can be linearly approximated as a function that satisfies a straight line (hereinafter referred to as a linear approximation function).

[0116] Referring to Figure 6 , the first main parameter B of the first reference formula RF1, the first main parameter B' of the second reference formula RF2, and the first main parameter B" of the third reference formula RF3 can satisfy the linear approximation function (y = αx + β) of linear approximation.

[0117] Therefore, the first main parameter (B in Equation 1) of the reference formula RF can be determined using the auxiliary parameters α and β of the linear approximation function (y = αx + β). Here, the auxiliary parameters α and β for determining the first main parameter B can be stored in the memory 120 in advance.

[0118] Figure 6 The graph of is shown based on the temporal change rate or the spatial change rate of the sample patterns CASE 1, CASE 2, and CASE 3. Therefore, in order to determine the first main parameter B, it is necessary to apply the temporal change rate or the spatial change rate to the linear approximation function (y = αx + β). According to an embodiment of the present disclosure, the first main parameter B can be dynamically determined by applying the temporal change rate or the spatial change rate of the input image data IPdata to the linear approximation function (y = αx + β).

[0119] In this case, the spatial change rate of the input image data IPdata can be defined as a frequency calculation value representing the spatial gray level value distribution of the current frame data DCF included in the input image data IPdata. In addition, the temporal change rate of the input image data IPdata can be defined as a frequency calculation value representing the change in the temporal gray level value of the input image data IPdata using the current frame data DCF and one or more previous frame data DPFs.

[0120] As a method for numerically converting the temporal change rate or spatial change rate of input image data IPdata, various suitable frequency conversion methods including discrete cosine transform (DCT) can be utilized.

[0121] Figure 7 It is a conceptual diagram of mobility for explaining a reference formula according to an embodiment of the present disclosure.

[0122] As described above, the previous frame data DPF of data satisfying the reference formula RF can be constant. However, since the previous frame data DPF and the current frame data DCF vary depending on the type or kind of the input image data IPdata, it can be difficult to determine all over-driven frame data DOF with a single reference formula RF. For example, in Figure 7 In the graph shown, the ninth data P9 may not lie on the reference formula RF. Therefore, it is impossible to define the over-driven frame data DOF according to the ninth data P9 using the reference formula RF.

[0123] To solve this problem, in an embodiment of the present disclosure, the mobility MRF of the reference formula RF can be defined. For example, the mobility MRF can be a value indicating the degree of shift (or parallel translation) of the current frame data DCF of the reference formula RF (e.g., shifted away from the ninth data P9 along the current frame data DCF axis).

[0124] For example, in Figure 7 In the reference formula RF shown, when the current frame data DCF is shifted by a gray level value of 32, a shifted reference formula SRF can be obtained. Figure 7 The shifted reference formula SRF shown in Figure 7 can satisfy the first default data having a gray level value of 96. For example,

[0125] The previous frame data DPF of the shifted reference formula SRF shown in

[0126] can be 96 (e.g., can be a constant value of 96). Thus, the mobility MRF can be determined differently according to the previous frame data DPF or the current frame data DCF of the input image data IPdata.

[0125] Therefore, when the reference formula RF is shifted according to the mobility MRF, a shifted reference formula SRF satisfying the ninth data P9 can be obtained.

[0126] For example, the shifted reference formula SRF can be defined as Equation 2 below.

[0127] Equation 2

[0128] DOF - DPF = A·(DCF - MRF) 3 + B·(DCF - MRF) 2 + C·(DCF - MRF) + D

[0129] In Equation 2, MRF is the mobility, and the remaining values are the same as those in Equation 1, so the same description will not be repeated.

[0130] According to an embodiment of the present disclosure, some of the main parameters (such as A, C, and D) and the auxiliary parameters α and β for determining the first main parameter B can be set or predetermined and stored in the memory 120, and the reference formula RF can be determined using the main parameters A, C, and D and the auxiliary parameters α and β. The mobile reference formula SRF can be generated by applying the mobility MRF to the determined reference formula RF, and the over-drive look-up table ODLUT can be generated or replaced using the generated mobile reference formula SRF.

[0131] The over-drive look-up table ODLUT can be a table in which the gray-level values D11, D12, D13, ……, D21, ……, D31, …… of the over-drive frame data DOF are defined according to the matching relationship between the gray-level value of the previous frame data DPF and the gray-level value of the current frame data DCF. When the over-drive look-up table ODLUT is pre-generated in the manufacturing process and stored in the memory 120, a memory 120 with a large storage capacity storing the matching relationship between the gray-level value of the previous frame data DPF and the gray-level value of the current frame data DCF is required.

[0132] To solve this problem, according to an embodiment of the present disclosure, when the display device DD is driven, the over-drive look-up table ODLUT can be generated by using the reference formula RF and the mobility MRF in real time. In another embodiment of the present disclosure, the over-drive look-up table ODLUT can be replaced with the reference formula RF and the mobility MRF. For example, the reference formula RF and the mobility MRF can be pre-generated in the manufacturing process and stored in the memory 120.

[0133] Therefore, even if the storage capacity of the memory 120 (for example, the required storage capacity) is very small, the matching relationship between the gray-level value of the previous frame data DPF and the gray-level value of the current frame data DCF can be defined.

[0134] Referring to Figure 7 the over-drive look-up table ODLUT, when only using the matching relationship between the gray-level value of the previous frame data DPF and the gray-level value of the current frame data DCF, it is difficult to reflect the spatial change rate of the input image data IPdata input to the display device DD.

[0135] However, according to an embodiment of the present disclosure, since the first main parameter B of the reference formula RF is determined considering the spatial change rate of the input image data IPdata, the over-drive result (for example, the over-drive frame data DOF) can vary according to the spatial change rate.

[0136] For example, the overdriver 100 may output first overdrive frame data with respect to current frame data DCF included in input image data IPdata having a first spatial change rate and a first temporal change rate. In this case, the overdriver 100 may output second overdrive frame data different from the first overdrive frame data with respect to current frame data DCF included in input image data IPdata having a second temporal change rate equal to the first temporal change rate and a second spatial change rate higher than the first spatial change rate.

[0137] Figure 8 is a flowchart showing a method of driving a display device according to an embodiment of the present disclosure.

[0138] Referring to Figure 8 , the method of driving the display device DD may include the following steps: calculating a temporal change rate or a spatial change rate with respect to the input image data IPdata (S100); determining a first main parameter B according to the calculation result (S110); determining a reference formula RF having the first main parameter B (S120); and generating overdrive frame data DOF for the current frame data DCF included in the input image data IPdata by using the reference formula RF (S130).

[0139] For example, the spatial change rate may be defined as a frequency calculation value representing the spatial gray level value distribution of the current frame data DCF. Additionally, the temporal change rate may be defined as a frequency calculation value representing the change in the temporal gray level value of the input image data IPdata using the current frame data DCF and one or more previous frame data DPF.

[0140] The reference formula RF may be a formula in which the difference between the overdrive frame data DOF and the previous frame data DPF of the current frame data DCF is expressed as a polynomial of the current frame data DCF.

[0141] The reference formula RF may be defined according to Equation 1 above.

[0142] In the step of determining the first main parameter B (S110), at least one auxiliary parameter stored in the memory 120 may be used to determine a linear approximation function, and the first main parameter B may be determined by inputting the temporal change rate or the spatial change rate into the linear approximation function.

[0143] The linear approximation function may be a function obtained by determining a plurality of reference formulas RF by using data extracted from a plurality of sample patterns and linearly approximating the first main parameter B according to the plurality of reference formulas RF.

[0144] In the step (S130) of generating the overdrive frame data DOF, the mobility MRF of the reference formula RF can be determined based on the current frame data DCF and the previous frame data DPF, and the overdrive frame data DOF can be generated by using the shifted reference formula SRF obtained by shifting the reference formula RF according to the determined mobility MRF.

[0145] The reference formula RF can satisfy at least one default data. The default data can include the first default data corresponding to the case where the gray level values of the current frame data DCF, the previous frame data DPF, and the overdrive frame data DOF are the same, and the second default data corresponding to the case where the gray level value of the current frame data DCF is the maximum gray level value.

[0146] In addition, the descriptions related to the above Figures 1 to 7 can be applied to the method of driving the display device DD.

[0147] According to the display device and the method of driving the display device of the present disclosure, since the entire look-up table for overdriving is not stored in the memory, the storage capacity of the memory can be minimized or reduced. In addition, since the overdrive data can be determined in real time according to the input image data by using set or predetermined parameters, the overdrive of the input image data can be improved or optimized.

[0148] The device and / or any other relevant device or component according to the embodiments of the present invention described herein can be implemented by using any suitable hardware, firmware (e.g., application specific integrated circuit), software, or a combination of software, firmware, and hardware. For example, various components of the device can be formed on one integrated circuit (IC) chip or on separate IC chips. In addition, various components of the device can be implemented on a flexible printed circuit film, a tape carrier package (TCP), a printed circuit board (PCB), or formed on a substrate. In addition, various components of the device can be processes or threads that run on one or more processors in one or more computing devices, execute computer program instructions, and interact with other system components to perform various functions described herein. The computer program instructions are stored in a memory, which can be implemented in a computing device using standard memory devices (such as random access memory (RAM) for example). The computer program instructions can also be stored in other non-transitory computer-readable media (such as CD-ROM, flash drive, etc. for example). In addition, those skilled in the art should recognize that, without departing from the scope of the exemplary embodiments of the present invention, the functions of various computing devices can be combined or integrated into a single computing device, or the functions of a specific computing device can be distributed across one or more other computing devices.

[0149] The accompanying drawings referred to herein and the detailed description of the present disclosure above are merely illustrative of the present disclosure. It will be understood that the present disclosure is disclosed for illustrative purposes only and is not intended to limit the scope of the present disclosure as described in the claims and their equivalents. Therefore, those skilled in the art will appreciate that various suitable modifications and equivalent embodiments are feasible without departing from the scope of the present disclosure. Accordingly, the true scope of the present disclosure should be determined by the technical concept of the claims and their equivalents.

Claims

1. A display device, the display device comprising: An over - driver that over - drives current frame data included in input image data to output over - driven frame data for the current frame data; A data driver that generates a data signal based on the over - driven frame data; And A display panel including a plurality of pixels that receive the data signal, wherein the over - driver calculates a temporal change rate or a spatial change rate of the input image data to obtain a calculation result, and outputs the over - driven frame data using a reference formula or a moving reference formula, the reference formula having a first main parameter determined according to the calculation result, and the moving reference formula being obtained by shifting the reference formula according to a mobility; wherein the reference formula is a formula in which a difference between the over - driven frame data and a previous frame data of the current frame data is expressed as a polynomial of the current frame data; wherein the previous frame data is DPF, the current frame data is DCF, the over - driven frame data is DOF, and the main parameters are A, B, C, and D, where B is the first main parameter, and the reference formula is as follows: , and wherein the mobility is MRF, and the moving reference formula is as follows: 。 2. The display device according to claim 1, wherein, The over - driver outputs first over - driven frame data for input image data including a first temporal change rate and a first spatial change rate, and outputs second over - driven frame data different from the first over - driven frame data for input image data including a second temporal change rate and a second spatial change rate, the second temporal change rate being equal to the first temporal change rate, and the second spatial change rate being higher than the first spatial change rate.

3. The display device according to claim 1, wherein, The over - driver includes a memory that stores the main parameters of the reference formula and at least one auxiliary parameter for the first main parameter among the main parameters.

4. The display device according to claim 3, Among them, The over - driver uses the at least one auxiliary parameter to determine a linear approximation function, wherein the over - driver inputs the temporal change rate or the spatial change rate into the linear approximation function to determine the first main parameter, and wherein the linear approximation function is a function obtained by determining a plurality of reference formulas using data extracted from a plurality of sample patterns and linearly approximating the first main parameter according to the plurality of reference formulas.

5. The display device according to claim 4, wherein, The plurality of sample patterns include: A first sample pattern in which black and white gray levels alternate at least twice in each of a first direction and a second direction perpendicular to the first direction within one frame; A second sample pattern in which the black and white gray levels alternate at least once in each of the first direction and the second direction within one frame; and A third sample pattern having a single gray level within one frame, and wherein the first sample pattern includes a region that changes from the black gray level to the white gray level or from the white gray level to the black gray level after one frame interval. Among them, the second sample pattern includes an area that changes from the black gray level to the white gray level or from the white gray level to the black gray level after a two-frame interval, and Among them, the third sample pattern includes an area that changes from the black gray level to the white gray level or from the white gray level to the black gray level after a three-frame interval.

6. The display device according to claim 1, wherein, The overdriver determines the mobility according to the current frame data and the previous frame data.

7. The display device according to claim 1, Among them, The reference formula satisfies at least one of the default data among the default data, and Among them, the default data includes: The first default data corresponds to the case where the gray level values of the current frame data, the previous frame data, and the overdrive frame data are the same; and The second default data corresponds to the case where the gray level value of the current frame data is the maximum gray level value.

8. The display device according to claim 1, wherein, The previous frame data of the data that satisfies the reference formula has a constant gray level value.

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