Display device and display driving method

Abstract

Embodiments of the present disclosure relate to a display device and a display driving method. Specifically, a display driving method can be provided, which includes the following steps: detecting a driving current of each unit of a display panel provided with a plurality of sub-pixels; scaling the driving current data of each unit into driving current data of each sub-pixel unit; calculating first compensation data by comparing the driving current data of each sub-pixel unit with target data; calculating final compensation data by comparing the first compensation data with guidance data; and compensating characteristic values ​​of a plurality of sub-pixels based on the final compensation data.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a display device and a display driving method capable of effectively compensating for characteristic values ​​of a driving transistor constituting a sub-pixel. Background Art

[0002] As the information society develops, various demands for display devices for displaying images are increasing, and various types of display devices, such as a liquid crystal display (LCD) and an organic light emitting display, are used.

[0003] Among these display devices, an organic light emitting diode display employs an organic light emitting diode and thus has fast responsiveness and various advantages in contrast, light emitting efficiency, brightness, and viewing angle.

[0004] The organic light emitting diode display includes organic light emitting diodes arranged in sub-pixels on a display panel, and emits light by controlling current flowing to the organic light emitting diodes, thereby controlling brightness represented by each sub-pixel while displaying an image.

[0005] Each sub-pixel disposed on a display panel of a display device has a light-emitting element and a driving transistor for driving the light-emitting element. The characteristic value of the driving transistor in each sub-pixel may vary according to the driving time of the display panel, or the characteristic values ​​of the driving transistor may deviate from each other due to the difference in driving time between the sub-pixels.

[0006] Therefore, since a brightness deviation (brightness non-uniformity) may occur between sub-pixels, image quality may be degraded. In order to solve the brightness deviation between sub-pixels, a technique for sensing and compensating for a deviation between characteristic values ​​of a driving transistor is used.

[0007] Recent display devices have increased resolution to meet user needs. Therefore, due to the increased resolution, it may take longer to sense and compensate for the characteristic value of the driving transistor.

[0008] In particular, the characteristic values ​​of the driving transistor include threshold voltage and mobility. The measurement of threshold voltage is performed when the driving transistor reaches a saturation state and requires a longer compensation time than the measurement of mobility. Summary of the invention

[0009] The inventors of the present disclosure have invented a display device and a display driving method which are capable of effectively compensating for characteristic values ​​of a driving transistor constituting a sub-pixel.

[0010] Embodiments of the present disclosure may provide a display device and a display driving method capable of shortening a compensation time for a characteristic value of a driving transistor by detecting a current of each block of a display panel.

[0011] Embodiments of the present disclosure may also provide a display device and a display driving method capable of improving the accuracy of compensation for a characteristic value of a driving transistor by compensating current data detected for each block based on target data and guide data.

[0012] An embodiment of the present disclosure may provide a display driving method, which includes the following steps: detecting a driving current of each unit of a display panel including multiple sub-pixels; scaling the driving current data of each unit into driving current data of each sub-pixel unit; calculating first compensation data by comparing the driving current data of each sub-pixel unit with target data; calculating final compensation data by comparing the first compensation data with guidance data; and compensating characteristic values ​​of multiple sub-pixels based on the final compensation data.

[0013] An embodiment of the present disclosure may provide a display device, which includes: a display panel, which includes a plurality of sub-pixels; a data driving circuit, which is configured to provide a data voltage to the display panel; a power management circuit, which is configured to provide a driving current to the display panel through a driving voltage line; a driving current detection circuit, which is configured to detect the driving current of each unit of the display panel; and a timing controller, which is configured to scale the driving current data of each unit generated by the driving current detection circuit into driving current data of each sub-pixel unit, calculate first compensation data by comparing the driving current data of each sub-pixel unit with target data, calculate final compensation data by comparing the first compensation data with guidance data, and compensate for characteristic values ​​of multiple sub-pixels based on the final compensation data.

[0014] According to an embodiment of the present disclosure, a display device and a display driving method capable of effectively compensating for a characteristic value of a driving transistor constituting a sub-pixel can be provided.

[0015] According to an embodiment of the present disclosure, a display device and a display driving method capable of shortening a compensation time for a characteristic value of a driving transistor by detecting a current of each block of a display panel may be provided.

[0016] According to an embodiment of the present disclosure, a display device and a display driving method capable of improving the accuracy of compensation for a characteristic value of a driving transistor by compensating current data detected for each block based on target data and guidance data may be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0018] Figure 1 is a diagram schematically illustrating a configuration of a display device according to various embodiments of the present disclosure;

[0019] Figure 2 is a diagram illustrating an example of a system of a display device according to an embodiment of the present disclosure;

[0020] Figure 3 is a diagram illustrating an example of a circuit constituting a sub-pixel in a display device according to an embodiment of the present disclosure;

[0021] Figure 4 is a flowchart illustrating a display driving method according to an embodiment of the present disclosure;

[0022] Figure 5 is a diagram illustrating an example of dividing a display panel into a plurality of blocks in a display device according to an embodiment of the present disclosure;

[0023] Figure 6 is a diagram illustrating an example of a transmission path of a driving voltage in a display device according to an embodiment of the present disclosure;

[0024] Figure 7 is a diagram illustrating an example of a circuit for detecting a driving current of each block in a display device according to an embodiment of the present disclosure;

[0025] Figure 8 is a diagram illustrating an example of a path of a driving current during a display driving period and during a driving current detection period in a display device according to an embodiment of the present disclosure;

[0026] Fig. 9 is a diagram illustrating an example of a process of scaling a driving current per block unit to a driving current per sub-pixel unit in a display device according to an embodiment of the present disclosure;

[0027] Fig.10 is a diagram illustrating an example of a process of calculating first compensation data by comparing driving current data per sub-pixel unit with target data in a display driving method according to an embodiment of the present disclosure;

[0028] Fig.11 is a diagram illustrating an example of instruction data in a display driving method according to an embodiment of the present disclosure;

[0029] Fig.12 is a diagram illustrating an example of a process of calculating final compensation data by comparing first compensation data with guidance data in a display driving method according to an embodiment of the present disclosure; and

[0030] Fig.13is a diagram illustrating an example of data distribution of a display panel when characteristic value compensation is performed using a display driving method according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to exemplary drawings. In the following description of examples or embodiments of the present disclosure, reference will be made to the drawings, in which specific examples or embodiments that can be implemented are shown by way of example, and in the drawings, even when the same reference numerals and symbols are shown in different drawings from each other, the same reference numerals and symbols can be used to indicate the same or similar parts. In addition, in the following description of examples or embodiments of the present disclosure, when it is determined that the detailed description of the known functions and components incorporated herein may make the subject matter in some embodiments of the present disclosure unclear, the detailed description will be omitted. As used herein, terms such as "including", "having", "containing", "constituting", "consisting of" and "formed by" are generally intended to allow the addition of other components, unless the term is used together with the term "only". As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form.

[0032] Terms such as "first", "second", "A", "B", "(A)" or "(B)" may be used herein to describe elements of the present disclosure. Each of these terms is not used to limit the nature, order, sequence or quantity of the elements, etc., but is only used to distinguish the corresponding elements from other elements.

[0033] When it is mentioned that a first element is “connected or coupled to”, “contacts or overlaps”, etc. a second element, it should be interpreted that not only the first element can be “directly connected or coupled to” or “directly contact or overlaps” the second element, but also a third element can be “interposed” between the first and second elements, or the first and second elements can be “connected or coupled to”, “contacts or overlaps”, etc. each other via a fourth element. Here, the second element can be included in at least one element of two or more elements that are “connected or coupled to”, “contacts or overlaps”, etc. each other.

[0034] When time-related terms such as "after", "after", "next", "before", etc. are used to describe a process or operation of an element or configuration, or a flow or step in an operation, process, or manufacturing method, these terms may be used to describe non-sequential or non-sequential processes or operations unless the terms "directly" or "immediately" are used together.

[0035] In addition, when any size, relative size, etc. is mentioned, even if no relevant description is specified, it should be considered that the numerical value or corresponding information (e.g., level, range, etc.) of the element or feature includes a tolerance or error range that may be caused by various factors (e.g., process factors, internal or external impact, noise, etc.). In addition, the term "may" fully encompasses all meanings of the term "may".

[0036] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0037] Figure 1 is a diagram schematically illustrating a configuration of a display device according to various embodiments of the present disclosure.

[0038] Reference Figure 1 According to an embodiment of the present disclosure, a display device 100 may include: a display panel 110, in which a plurality of gate lines GL and data lines DL are connected and a plurality of sub-pixels SP are arranged in a matrix form; a gate driving circuit 120, which drives the plurality of gate lines GL; a data driving circuit 130, which provides a data voltage through the plurality of data lines DL; a timing controller 140, which controls the gate driving circuit 120 and the data driving circuit 130; and a power management circuit 150.

[0039] The display panel 110 displays an image based on a scan signal transmitted from the gate driving circuit 120 through a plurality of gate lines GL and a data voltage transmitted from the data driving circuit 130 through a plurality of data lines DL.

[0040] In the case of a liquid crystal display, the display panel 110 may include a liquid crystal layer formed between two substrates, and may operate in any known mode, such as a twisted nematic (TN) mode, a vertical alignment (VA) mode, an in-plane switching (IPS) mode, or a fringe field switching (FFS) mode. In the case of an organic light emitting display, the display panel 110 may be implemented in a top emission scheme, a bottom emission scheme, or a dual emission scheme.

[0041] In the display panel 110, a plurality of pixels may be arranged in a matrix form, and each pixel may include sub-pixels SP having different colors, such as a white sub-pixel, a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and each sub-pixel SP may be defined by a plurality of data lines DL and a plurality of gate lines GL.

[0042] One subpixel SP may include, for example, a thin film transistor (TFT) formed at an intersection between one data line DL and one gate line GL, a light emitting element (eg, an organic light emitting diode) charged with a data voltage, and a storage capacitor electrically connected to the light emitting element to maintain a voltage.

[0043] For example, when the display device 100 having a resolution of 2160×3840 includes four sub-pixels SP of white (W), red (R), green (G), and blue (B), 3840 data lines DL may be connected to 2160 gate lines GL and four sub-pixels WRGB, and thus, 3840×4=15360 data lines DL may be provided. Each sub-pixel SP is disposed at an intersection between a gate line GL and a data line DL.

[0044] The gate driving circuit 120 may be controlled by the controller 140 to sequentially output scan signals to a plurality of gate lines GL provided in the display panel 110 , thereby controlling a driving timing of a plurality of sub-pixels SP.

[0045] In the display device 100 having a resolution of 2160×3840, sequentially outputting scan signals to 2160 gate lines GL from the first gate line to the 2160th gate line may be referred to as 2160-phase driving. Sequentially outputting scan signals to each unit of four gate lines GL is referred to as 4-phase driving, for example, after sequentially outputting scan signals to the first gate line to the fourth gate line, the scan signals are sequentially output to the fifth gate line to the eighth gate line. In other words, sequentially outputting scan signals to every N gate lines GL may be referred to as N-phase driving.

[0046] The gate drive circuit 120 may include one or more gate drive integrated circuits (GDICs). Depending on the driving scheme, the gate drive circuit 120 may be positioned only on one side of the display panel 110 or on each of two opposite sides. The gate drive circuit 120 may be implemented in the form of a gate in panel (GIP) embedded in the bezel region of the display panel 110.

[0047] The data driving circuit 130 receives the image data DATA from the timing controller 140 and converts the received image data DATA into an analog data voltage. Then, since the data voltage is output to each data line DL according to the timing of applying the scan signal through the gate line GL, each sub-pixel SP connected to the data line DL displays a light emitting signal having a brightness corresponding to the data voltage.

[0048] Likewise, the data driving circuit 130 may include one or more source driver integrated circuits SDIC, and the source driver integrated circuits SDIC may be connected to bonding pads of the display panel 110 in a tape automated bonding (TAB) type or a chip on glass (COG) type, or may be directly disposed on the display panel 110.

[0049] In some cases, each source driver integrated circuit SDIC may be integrated and disposed on the display panel 110. In addition, each source driver integrated circuit SDIC may be implemented in a chip on film (COF) type, and in this case, each source driver integrated circuit SDIC may be mounted on a circuit film and may be electrically connected to the data line DL of the display panel 110 through the circuit film.

[0050] The timing controller 140 provides various control signals to the gate driving circuit 120 and the data driving circuit 130, and controls the operations of the gate driving circuit 120 and the data driving circuit 130. In other words, the timing controller 140 may control the gate driving circuit 120 to output a scan signal according to the timing implemented in each frame, and on the other hand, transmit the image data DATA received from the outside to the data driving circuit 130.

[0051] In this case, the timing controller 140 receives several timing signals including, for example, a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE, and a main clock MCLK, and image data DATA from the external host system 200 .

[0052] The host system 200 may be any of a television (TV) system, a set-top box, a navigation system, a personal computer (PC), a home theater system, a mobile device, and a wearable device.

[0053] Therefore, the timing controller 140 may generate a control signal according to various timing signals received from the host system 200 and transmit the control signal to the gate driving circuit 120 and the data driving circuit 130 .

[0054] For example, the timing controller 140 outputs several gate control signals including, for example, a gate start pulse GSP, a gate clock GCLK, and a gate output enable signal GOE to control the gate drive circuit 120. The gate start pulse GSP controls the timing at which one or more gate drive integrated circuits GDIC constituting the gate drive circuit 120 start operating. The gate clock GCLK is a clock signal commonly input to one or more gate drive integrated circuits GDIC, and controls the shift timing of the scan signal. The gate output enable signal GOE specifies timing information about one or more gate drive integrated circuits GDIC.

[0055] The timing controller 140 outputs various data control signals including, for example, a source start pulse SSP, a source sampling clock SCLK, and a source output enable signal SOE to control the data driving circuit 130. The source start pulse SSP controls the timing of starting data sampling of one or more source driver integrated circuits SDIC constituting the data driving circuit 130. The source sampling clock SCLK is a clock signal that controls the timing of sampling data in the source driver integrated circuit SDIC. The source output enable signal SOE controls the output timing of the data driving circuit 130.

[0056] The display device 100 may further include a power management circuit 150 that supplies various voltages or currents to, for example, the display panel 110 , the gate driving circuit 120 , and the data driving circuit 130 , or controls the various voltages or currents to be supplied.

[0057] The power management circuit 150 regulates a direct current (DC) input voltage Vin provided from the host system 200 , thereby generating power required to drive the display panel 110 , the gate driving circuit 120 , and the data driving circuit 130 .

[0058] The sub-pixel SP is positioned at the intersection between the gate line GL and the data line DL, and a light emitting element may be provided in each sub-pixel SP. For example, an organic light emitting diode display may include a light emitting element such as an organic light emitting diode in each sub-pixel SP, and may display an image by controlling a current flowing to the light emitting element according to a data voltage.

[0059] The display device 100 may be one of various types of devices such as a liquid crystal display, an organic light emitting diode display, or a plasma display panel.

[0060] Figure 2 is a diagram illustrating an example of a system of a display device according to an embodiment of the present disclosure.

[0061] Reference Figure 2 In the display device 100 according to an embodiment of the present disclosure, the source driver integrated circuit SDIC included in the data driver circuit 130 and the gate driver integrated circuit GDIC included in the gate driver circuit 120 are implemented in a chip on film (COF) type among various types (e.g., TAB, COG, or COF).

[0062] One or more gate driving integrated circuits GDIC included in the gate driving circuit 120 may each be mounted on the gate film GF, and one side of the gate film GF may be electrically connected to the display panel 110. Lines for electrically connecting the gate driving integrated circuits GDIC and the display panel 110 may be provided on the gate film GF.

[0063] Likewise, one or more source driver integrated circuits SDIC included in the data driver circuit 130 may each be mounted on the source film SF, and one side of the source film SF may be electrically connected to the display panel 110. Lines for electrically connecting the source driver integrated circuits SDIC and the display panel 110 may be provided on the source film SF.

[0064] The display device 100 may include at least one source printed circuit board SPCB for circuit connection between a plurality of source driving integrated circuits SDIC and other devices and a control printed circuit board CPCB for mounting control parts and various electrical devices.

[0065] The other side of the source film SF on which the source driver integrated circuit SDIC is mounted may be connected to at least one source printed circuit board SPCB. In other words, one side of the source film SF on which the source driver integrated circuit SDIC is mounted may be electrically connected to the display panel 110, and the other side thereof may be electrically connected to the source printed circuit board SPCB.

[0066] The timing controller 140 and the power management circuit (power management IC) 150 may be mounted on the control printed circuit board CPCB. The timing controller 140 may control the operations of the data driving circuit 130 and the gate driving circuit 120. The power management circuit 150 may provide a driving voltage or current to the display panel 110, the data driving circuit 130, and the gate driving circuit 120, and control the provided voltage or current.

[0067] At least one source printed circuit board SPCB and the control printed circuit board CPCB may be circuit-connected by at least one connecting member. The connecting member may include, for example, a flexible printed circuit (FPC) or a flexible flat cable (FFC). In this case, the connecting member connecting at least one source printed circuit board SPCB and the control printed circuit board CPCB may vary according to the size and type of the display device 100. At least one source printed circuit board SPCB and the control printed circuit board CPCB may be integrated into a single printed circuit board.

[0068] In the display device 100 configured in this way, the power management circuit 150 transmits a driving voltage required for display driving or characteristic value sensing to the source printed circuit board SPCB through the flexible printed circuit FPC or the flexible flat cable FFC. The driving voltage transmitted to the source printed circuit board SPCB is provided to emit light or sense a specific sub-pixel SP in the display panel 110 through the source drive integrated circuit SDIC.

[0069] Each of the sub-pixels SP arranged in the display panel 110 in the display device 100 may include an organic light emitting diode as a light emitting element and a circuit element (eg, a driving transistor) for driving the organic light emitting diode.

[0070] The type and number of circuit elements constituting each sub-pixel SP may vary depending on the functions to be provided and the design scheme.

[0071] Figure 3 is a diagram illustrating an example of a circuit constituting a sub-pixel in a display device according to an embodiment of the present disclosure.

[0072] Reference Figure 3 In the display device 100 according to an embodiment of the present disclosure, the sub-pixel SP may include one or more transistors and capacitors and an organic light emitting diode (OLED) as a light emitting element ED.

[0073] For example, the sub-pixel SP may include a driving transistor DRT, a switching transistor SWT, a sensing transistor SENT, a storage capacitor Cst, and a light emitting element ED.

[0074] The driving transistor DRT includes a first node N1, a second node N2, and a third node N3. The first node N1 of the driving transistor DRT may be a gate node to which the data voltage Vdata is applied from the data driving circuit 130 through the data line DL when the switching transistor SWT is turned on. The second node N2 of the driving transistor DRT may be electrically connected to the anode of the light emitting element ED and may be a source node or a drain node. The third node N3 of the driving transistor DRT may be electrically connected to the driving voltage line DVL to which the driving voltage EVDD is applied and may be a drain node or a source node.

[0075] In this case, during the display driving period, the driving voltage EVDD required for displaying an image may be supplied to the driving voltage line DVL. For example, the driving voltage EVDD required for displaying an image may be 27V.

[0076] The switching transistor SWT is electrically connected between the first node N1 of the driving transistor DRT and the data line DL, and the gate line GL is connected to the gate node. Therefore, the switching transistor SWT operates according to the scan signal SCAN provided through the gate line GL. When turned on, the switching transistor SWT transmits the data voltage Vdata provided through the data line DL to the gate node of the driving transistor DRT, thereby controlling the operation of the driving transistor DRT.

[0077] The sensing transistor SENT is electrically connected between the second node N2 of the driving transistor DRT and the reference voltage line RVL, and the gate line GL is connected to the gate node. The sensing transistor SENT operates according to the sensing signal SENSE provided by the gate line GL. When the sensing transistor SENT is turned on, the sensing reference voltage Vref provided by the reference voltage line RVL is transmitted to the second node N2 of the driving transistor DRT.

[0078] In other words, when the switching transistor SWT and the sensing transistor SENT are controlled, the voltage of the first node N1 and the voltage of the second node N2 of the driving transistor DRT are controlled so that a current for driving the light emitting element ED can be provided.

[0079] The gate nodes of the switching transistor SWT and the sensing transistor SENT may be commonly connected to one gate line GL, or may be connected to different gate lines GL. An example is shown in which the switching transistor SWT and the sensing transistor SENT are connected to different gate lines GL, in which case the switching transistor SWT and the sensing transistor SENT may be independently controlled by the scan signal SCAN and the sensing signal SENSE transmitted through the different gate lines GL.

[0080] In contrast, if the switching transistor SWT and the sensing transistor SENT are connected to one gate line GL, the switching transistor SWT and the sensing transistor SENT may be simultaneously controlled by the scan signal SCAN or the sensing signal SENSE transmitted through one gate line GL, and the aperture ratio of the subpixel SP may be increased.

[0081] The transistor provided in the sub-pixel SP may be an n-type transistor or a p-type transistor, and in the illustrated example, the transistor is an n-type transistor.

[0082] The storage capacitor Cst is electrically connected between the first node N1 and the second node N2 of the driving transistor DRT, and maintains the data voltage Vdata during one frame.

[0083] Depending on the type of the driving transistor DRT, the storage capacitor Cst may also be connected between the first node N1 and the third node N3 of the driving transistor DRT. The anode electrode of the light emitting element ED may be electrically connected to the second node N2 of the driving transistor DRT, and the base voltage EVSS may be applied to the cathode of the light emitting element ED.

[0084] The base voltage EVSS may be a ground voltage or a voltage higher or lower than the ground voltage. The base voltage EVSS may vary according to the driving state. For example, the base voltage EVSS during display driving and the base voltage EVSS during sensing driving may be set to be different from each other.

[0085] The structure of the sub-pixel SP described above as an example is a 3T (transistor) 1C (capacitor) structure, which is merely an example for description, and may further include one or more transistors, or may further include one or more capacitors in some cases. A plurality of sub-pixels SP may have the same structure, or some of the plurality of sub-pixels SP may have different structures.

[0086] In order to effectively sense the characteristic value of the driving transistor DRT, such as a threshold voltage or mobility, the display device 100 according to an embodiment of the present disclosure may use a method for measuring the current generated by the voltage charged to the storage capacitor Cst during the characteristic value sensing period of the driving transistor DRT, which is called current sensing.

[0087] In other words, by measuring the current generated by the voltage charged to the storage capacitor Cst during the characteristic value sensing period of the driving transistor DRT, the characteristic value or the change in the characteristic value of the driving transistor DRT in the subpixel SP may be calculated.

[0088] In this case, the reference voltage line RVL is not only used to transmit the reference voltage Vref, but also used as a sensing line for sensing a characteristic value of the driving transistor DRT in the sub-pixel SP. Therefore, the reference voltage line RVL may also be referred to as a sensing line.

[0089] In this case, the period for sensing the characteristic values ​​(threshold voltage and mobility) of the driving transistor DRT can be performed after the power-on signal is generated and before the display driving starts. For example, if the power-on signal is applied to the display device 100, the timing controller 140 loads the parameters required to drive the display panel 110 and then drives the display.

[0090] In this case, the parameters required to drive the display panel 110 may include information related to sensing and compensating characteristic values ​​previously performed on the display panel 110. In the parameter loading process, sensing of characteristic values ​​(threshold voltage and mobility) of the driving transistor DRT may be performed. As described above, a process in which characteristic values ​​are sensed in the parameter loading process after a power-on signal is generated is referred to as a turn-on sensing process.

[0091] Alternatively, after the power-off signal of the display device 100 is generated, a period in which the characteristic value of the driving transistor DRT is sensed may be performed. For example, when the power-off signal is generated in the display device 100, the timing controller 140 may cut off the data voltage Vdata supplied to the display panel 110 and may sense the characteristic value of the driving transistor DRT within a predetermined time. In this way, the process of sensing the characteristic value in a state in which the data voltage Vdata is cut off when the power-off signal is generated is referred to as a turn-off sensing process.

[0092] Alternatively, the sensing period of the characteristic value of the driving transistor DRT can be performed in real time while driving the display. This sensing process is called real-time (RT) sensing process. In the real-time sensing process, the sensing process can be performed on one or more sub-pixels SP in one or more sub-pixel SP lines in each blank period during the display driving period.

[0093] However, as the resolution of the display device 100 increases according to the development of technology and the needs of users, it takes a long time to sense and compensate for the characteristic value of the driving transistor DRT of each sub-pixel SP due to the realization of high-resolution sub-pixels SP.

[0094] In particular, the characteristic values ​​of the driving transistor DRT include a threshold voltage and a mobility. The measurement of the threshold voltage is performed when the driving transistor DRT reaches a saturation state and requires a longer compensation time than the measurement of the mobility.

[0095] According to an embodiment of the present disclosure, a display device and a display driving method capable of improving the accuracy of compensation for a characteristic value of a driving transistor DRT while shortening a sensing time of the characteristic value of the driving transistor may be provided.

[0096] Figure 4 is a flowchart illustrating a display driving method according to an embodiment of the present disclosure.

[0097] Reference Figure 4 According to an embodiment of the present disclosure, the display driving method may include a step S100 of detecting a driving current of each block unit, a step S200 of comparing the driving current at a current time with the driving current at a previous time, a step S300 of scaling the driving current data of each block unit into driving current data of each sub-pixel unit, a step S400 of comparing the driving current data of each sub-pixel unit with target data to calculate first compensation data, a step S500 of comparing the first compensation data with guidance data to calculate final compensation data, and a step S600 of compensating a characteristic value of a driving transistor DRT based on the final compensation data.

[0098] The step S100 of detecting the driving current per block unit is a process for dividing the sub-pixels SP of the display panel 110 into blocks and detecting the driving current of each block of the sub-pixels SP.

[0099] To this end, the display panel 110 may be divided into a plurality of blocks, and a plurality of sub-pixels SP may be included in a region occupied by each block.

[0100] Figure 5 is a diagram illustrating an example of dividing a display panel into a plurality of blocks in a display device according to an embodiment of the present disclosure.

[0101] Reference Figure 5 , in the display device 100 according to the embodiment of the present disclosure, the display panel 110 may be divided into P×Q blocks, and each block may include M×N sub-pixels SP.

[0102] In this case, sub-pixels SP having the same color may be bundled into one block.

[0103] Each block may include the same number of sub-pixels SP, or at least one or more blocks may include different numbers of sub-pixels SP.

[0104] For example, in the display panel 110 having a resolution of 2160×3840, when each block consists of 10×10 sub-pixels SP, the display panel 110 may be divided into 216×384 blocks, and each block may consist of 10×10 sub-pixels SP.

[0105] When the display panel 110 is thus divided into a plurality of blocks, a driving current of a specific block may be detected by summing driving currents flowing in the display panel 110 when the specific block is turned on and the other blocks are turned off.

[0106] If a predetermined level of driving current flows even when a specific block of the display panel 110 is turned off, the driving current of each block may be detected using the driving current flowing when the entire display panel 110 is turned off and the driving current flowing when the specific block is turned on.

[0107] Such a driving current per block unit may be detected at each frame, and the driving current per block unit detected at each frame may be stored in a memory.

[0108] Figure 6 is a diagram illustrating an example of a transmission path of a driving voltage in a display device according to an embodiment of the present disclosure.

[0109] Here, the Figure 2 Part A shown.

[0110] Reference Figure 6 , in the display device 100 according to the embodiment of the present disclosure, a plurality of sub-pixels SP defined by a plurality of data lines DL and a plurality of gate lines GL crossing each other are disposed on the display panel 110 .

[0111] In this case, each sub-pixel SP receives the driving voltage EVDD through a plurality of driving voltage lines DVL arranged in a direction parallel to the plurality of data lines DL.

[0112] The plurality of driving voltage lines DVL may be formed between the plurality of data lines DL to be parallel to the plurality of data lines DL, or may be formed to be shared by two sub-pixels adjacent to each other in the left-right direction.

[0113] The plurality of driving voltage lines DVL may be commonly connected to a common driving voltage line 135 formed in an upper non-display area of ​​the display panel 110 .

[0114] The driving voltage EVDD transferred from the power management circuit 150 is provided to the common driving voltage line 135 through the plurality of data driving circuits 130 .

[0115] In order to transmit the driving voltage EVDD to the plurality of driving voltage lines DVL, a first driving voltage supply line 131 , a second driving voltage supply line 132 , a third driving voltage supply line 133 , and a fourth driving voltage supply line 134 may be provided.

[0116] The first driving voltage supply line 131 , the second driving voltage supply line 132 , and the third driving voltage supply line 133 may be electrically connected to the source printed circuit board SPCB.

[0117] The fourth driving voltage supply line 134 may branch to two opposite sides of the source driving integrated circuit SDIC in the data driving circuit 130 , and may electrically connect the third driving voltage supply line 133 with the common driving voltage line 135 .

[0118] The third driving voltage supply line 133 may be disposed in a region adjacent to the source film SF and may be electrically connected to a fourth driving voltage supply line 134 formed in the data driving circuit 130 .

[0119] Since the first driving voltage supply line 131 corresponds to a portion to which the driving voltage EVDD supplied from the power management circuit 150 is immediately applied, the first driving voltage supply line 131 may be formed to have a relatively larger area than the third driving voltage supply line 133 .

[0120] The second driving voltage supply line 132 may be branched from the first driving voltage supply line 131 to have a predetermined interval and be connected to the third driving voltage supply line 133 .

[0121] In this case, since the second driving voltage supply line 132 is positioned in a region before the driving voltage EVDD branches through the plurality of driving voltage lines DVL, the second driving voltage supply line 132 has a relatively high current density compared to the fourth driving voltage supply line 134 and the driving voltage line DVL.

[0122] Therefore, the second driving voltage supply line 132 has a high possibility of temperature increase and defect occurrence due to a high density current.

[0123] In addition, the data driving circuit 130 may form a plurality of source driving integrated circuits SDIC into a group to provide the driving voltage EVDD on a group unit basis.

[0124] Figure 7 is a diagram illustrating an example of a circuit for detecting a driving current of each block in a display device according to an embodiment of the present disclosure.

[0125] Reference Figure 7 , the display device 100 according to an embodiment of the present disclosure may include a switch circuit 160 and a driving current detection circuit 170 for controlling a path of a driving current.

[0126] The switch circuit 160 controls a path of the driving current Id so that the driving current Id generated by the driving voltage EVDD is bypassed to the driving voltage line DVL or transmitted through the driving current detection circuit 170 .

[0127] During a display driving period in which an image is displayed on the display panel 110 , the driving current Id may be bypassed to the driving voltage line DVL.

[0128] In order to compensate for the characteristic value of the driving transistor DRT, the driving current Id may be transmitted through the driving current detection circuit 170 during a period in which the driving current Id is detected.

[0129] The driving current detection circuit 170 may include a current sensing resistor Rs, an operational amplifier 172 , and an analog-to-digital converter 174 .

[0130] The current sensing resistor Rs may be connected between a terminal to which the driving voltage EVDD is supplied and the data driving circuit 130 , thereby generating a bias voltage according to the driving current Id flowing from the power management circuit 150 to the data driving circuit 130 .

[0131] In this case, the current sensing resistor Rs may have a minute resistance, for example, 0.01Ω, to minimize a voltage drop of the driving voltage EVDD.

[0132] The operational amplifier 172 may be connected between both ends of the current sensing resistor Rs, thereby sensing and amplifying the bias voltage applied between both ends of the current sensing resistor Rs. For example, the operational amplifier 172 may amplify the bias voltage applied between both ends of the current sensing resistor Rs by five times or more.

[0133] The analog-to-digital converter 174 converts the driving current Id flowing through a specific block during one frame based on the bias voltage amplified by the operational amplifier 172, thereby generating driving current data Did.

[0134] The driving current data Did may be provided to the timing controller 140 , and the timing controller 140 may store the driving current data Did detected from each block in a memory.

[0135] In the illustrated example, the driving current Id is measured by the driving voltage EVDD, and the current sensing resistor Rs is connected in series between the driving voltage EVDD and the data driving circuit 130 .

[0136] In contrast, when measuring the driving voltage EVDD, a signal line and a dummy channel that transmit the data voltage EVDD between the data voltage EVDD and the data driving circuit 130 may be provided in parallel, and a change in the data voltage EVDD may be measured through the dummy channel.

[0137] Figure 8 is a diagram illustrating an example of a path of a driving current during a display driving period and during a driving current detection period in a display device according to an embodiment of the present disclosure.

[0138] Reference Figure 8 According to an embodiment of the present disclosure, in the display device 100 , during the display driving period DP in which an image is displayed on the display panel 110 , the driving current Id may be provided to the light emitting element ED through the driving voltage line DVL.

[0139] To this end, during the display driving period DP in which an image is displayed on the display panel 110 , the switching transistor SWT is turned on by the scan signal SCAN, and the sensing transistor SENT is turned off by the sensing signal SENSE.

[0140] Therefore, the driving current Id(DP) flowing to the sub-pixel SP during the display driving period DP is supplied to the light emitting element ED so that an image corresponding to the data voltage Vdata is displayed.

[0141] In contrast, the driving current Id(CP) flowing to the subpixel SP during the driving current detection period CP for compensating the characteristic value of the driving transistor DRT may not be supplied to the light emitting element ED to prevent the light emitting element ED from displaying an image.

[0142] To this end, during the driving current detection period CP for compensating for the characteristic value of the driving transistor DRT, the switching transistor SWT may be turned on by the scan signal SCAN, and the sensing transistor SENT may be turned on by the sensing signal SENSE.

[0143] Therefore, the driving current Id(CP) flowing to the sub-pixel SP during the driving current detection period CP may be transferred through the reference voltage line RVL.

[0144] The step S200 of comparing the driving current at the present time with the driving current at the previous time is a process for comparing the driving current Id detected for a specific block in the present frame with the driving current Id detected and stored for the same block in the previous frame.

[0145] If the magnitude of the driving current Id detected for a specific block in the current frame does not decrease compared to the previous frame, the comparison process can determine that degradation of the characteristic value in the specific block does not occur and omit the process for detecting the driving current Id and performing compensation.

[0146] However, such comparison processing may be omitted, and even when step S200 of comparing the driving current at the present time with the driving current at the previous time is omitted, a process for detecting the driving current Id of each block every frame or predetermined time and performing compensation may be performed.

[0147] The step S300 of scaling the driving current data per block unit to the driving current data per sub-pixel SP unit is a process for converting driving current data detected for a specific block including a plurality of sub-pixels SP into data for each of the plurality of sub-pixels SP included in the block.

[0148] Fig. 9 is a diagram illustrating an example of a process of scaling a driving current per block unit to a driving current per sub-pixel unit in a display driving method according to an embodiment of the present disclosure.

[0149] Reference Fig. 9 , the display device 100 according to an embodiment of the present disclosure may scale the driving current data Did detected for each specific block into data for each sub-pixel SP included in the block, wherein the display panel 110 is divided into blocks including a plurality of sub-pixels SP.

[0150] For example, the first driving current data Did1 detected for the first block Block 1 including 3×3 sub-pixels SP may correspond to the driving current Id flowing to the 9 sub-pixels SP included in the first block Block 1. Therefore, the first driving current data Did1 corresponds to a value representing the first block Block 1.

[0151] In this case, the sub-pixel driving currents respectively flowing to the nine sub-pixels SP included in the first block Block 1 may have the same or different values.

[0152] Therefore, the first driving current data Did1 detected in the first block Block 1 may be divided by 9 to be scaled into 9 identical sub-pixel driving current data Did11 to Did33 , or may be scaled into different sub-pixel driving current data Did11 to Did33 by applying interpolation.

[0153] However, the blocks of the display panel 110 may be divided into sub-pixels SP having the same color, or may be divided by other various criteria. Therefore, the positions of the sub-pixels SP in the blocks may vary. Therefore, if the block drive current data is divided by the number of sub-pixels SP included in the block, the sub-pixel (SP) drive current data may not be accurate. Therefore, it may be preferable to perform scaling by applying interpolation.

[0154] In order to scale into the plurality of sub-pixel driving current data Did11 to Did33 by applying interpolation, at least one or more of various interpolation methods including linear interpolation (eg, bilinear interpolation), bicubic interpolation, and spline interpolation may be used.

[0155] The step S400 of calculating the first compensation data by comparing the driving current data per sub-pixel SP unit with the target data is a process for compensating for a deviation between the driving current data per sub-pixel SP unit generated by scaling the driving current data per block unit and the target brightness of the display panel 110 .

[0156] Fig.10 is a diagram illustrating an example of a process of calculating first compensation data by comparing driving current data per sub-pixel unit with target data in a display driving method according to an embodiment of the present disclosure.

[0157] Reference Fig.10 , the display device 100 according to the embodiment of the present disclosure may generate target data corresponding to the display panel 110, extract the target data having the same resolution as the driving current data per sub-pixel unit, and compare them.

[0158] In this case, the target data may correspond to ideal data when the subpixel SP disposed on the display panel 110 generates brightness through the data voltage Vdata. For example, the target data may be brightness-related data set for each subpixel SP when the display device 100 according to an embodiment of the present disclosure is manufactured and marketed.

[0159] Alternatively, brightness-related data set through a turn-off sensing process in which a power-off signal is generated in the display device 100 and characteristic value sensing is performed while the data voltage Vdata is blocked may be used as the target data.

[0160] The target data may be stored in a memory. The timing controller 140 may compare the driving current data of each sub-pixel unit with the target data, thereby calculating the first compensation data.

[0161] For example, the driving current data Did11 to Did33 per sub-pixel unit consisting of 3×3 sub-pixels SP may be compared with the target data T11 to T33 having a 3×3 resolution, thereby generating the first compensation data C11 to C33.

[0162] In this case, the first compensation data C11 to C33 may be generated by compensating for the deviation between the driving current data Did11 to Did33 of each sub-pixel unit and the target data T11 to T33. Alternatively, the first compensation data C11 to C33 may be generated by performing regression analysis on the driving current data Did11 to Did33 of each sub-pixel unit and the target data T11 to T33.

[0163] As described above, the blocks of the display panel 110 may be divided into sub-pixels SP having the same color, or may be divided by other various criteria. Therefore, the positions of the sub-pixels SP in the blocks may vary. Therefore, the first compensation data C11 to C33 generated by compensating for the deviation between the driving current data Did11 to Did33 per sub-pixel unit and the target data T11 to T33 may be inaccurate. Therefore, it is preferred to generate the first compensation data C11 to C33 by applying regression analysis.

[0164] The step S500 of calculating the final compensation data by comparing the first compensation data with the guide data is a process for correcting errors in the first compensation data C11 to C33 by applying the guide data generated by reflecting the degradation characteristics of the display panel 110 .

[0165] Fig.11 is a diagram illustrating an example of instruction data in a display driving method according to an embodiment of the present disclosure. Fig.12 is a diagram illustrating an example of a process of calculating final compensation data by comparing first compensation data with guidance data in a display driving method according to an embodiment of the present disclosure.

[0166] Reference Fig.11 and Fig.12 , the display device 100 according to an embodiment of the present disclosure may generate guide data corresponding to the display panel 110, extract guide data having the same resolution as the first compensation data, and compare them.

[0167] In this case, the guide data may correspond to data reflecting the degree of degradation of the sub-pixels SP provided on the display panel 110. For example, the guide data may be brightness-related data set by applying a real-time sensing process of the display panel 110.

[0168] For example, in the case where brightness-related data set for each sub-pixel SP when the display device 100 is launched is used as target data, brightness-related data set by applying real-time sensing processing or shutdown sensing processing of the display panel 110 can be used as guidance data. In the shutdown sensing processing, characteristic value sensing is performed when the data voltage Vdata is blocked when a power-off signal is generated in the display device 100.

[0169] On the contrary, in the case where brightness-related data set by applying a shutdown sensing process in which characteristic value sensing is performed when the data voltage Vdata is blocked when a power-off signal is generated in the display device 100, brightness-related data set by applying a real-time sensing process of the display panel 110 may be used as guidance data.

[0170] The guide data may be stored in a memory, and the timing controller 140 may generate final compensation data by comparing the first compensation data with the guide data.

[0171] For example, when the display panel 110 has a resolution of X sub-pixels SP in the horizontal direction and Y sub-pixels SP in the vertical direction, guide data having the same resolution as the display panel 110 may be generated.

[0172] In this case, if the first compensation data consists of 3×3 sub-pixels SP, guide data G11 to G33 having a size of 3×3 are extracted from the guide data. In this way, the guide data G11 to G33 having the same resolution as the first compensation data can be used as a kernel Sn to be compared with the first compensation data C11 to C33.

[0173] In the core Sn, the first guidance data G1=G11, the second guidance data G2=G12, and the kth guidance data is G k .

[0174] The final compensation data F11 to F33 may be generated by regression analysis of the first compensation data C11 to C33 and the guide data G11 to G33. For efficient calculation, the guide data G11 to G33 and the final compensation data F11 to F33 may be defined to have a linear relationship.

[0175] For example, the kth final compensation data D out,k By providing the k-th guidance data G kApply weight p n and bias q n to be sure.

[0176]

[0177] Here, we need to determine the weight p n and bias q n , so that the kth final compensation data D is defined out,k The loss function E(p n ,q n ) is minimized.

[0178]

[0179] Here, D in,k corresponds to the k-th first compensation data, and λ is an adjustment term used to eliminate or minimize a specific weight to prevent overfitting of the regression analysis.

[0180] As described above, the blocks of the display panel 110 may be divided into sub-pixels SP having the same color, or may be divided by other various criteria. Therefore, the positions of the sub-pixels SP in the blocks may vary. Therefore, the final compensation data F11 to F33 generated by compensating for the deviation between the first compensation data C11 to C33 and the guidance data G11 to G33 may be inaccurate. Therefore, it is preferred to generate the final compensation data F11 to F33 by applying regression analysis.

[0181] In this case, since the loss function E(p n ,q n ) can be matched with the form of ridge regression analysis among several regression analysis methods, so by applying the general solution to ridge regression analysis, the weight p n and bias q n It can be expressed as follows.

[0182]

[0183]

[0184] Here, m n The core S represents the guide data n The average bootstrap data, σ n Represents the core S n The standard deviation of the bootstrap data, and represents the average first compensation data.

[0185] The display device 100 according to the embodiment of the present disclosure may determine optimized final compensation data by using the above method.

[0186] The step S600 of compensating the characteristic value of the driving transistor DRT based on the final compensation data is a process for compensating for degradation of the characteristic value of the driving transistor DRT by controlling the data voltage Vdata applied to the designated sub-pixel SP using the final compensation data in the timing controller 140 .

[0187] Fig.13 is a diagram illustrating an example of data distribution of a display panel when characteristic value compensation is performed using a display driving method according to an embodiment of the present disclosure.

[0188] Fig.13 (a) illustrates distribution of block driving current data detected per block unit in the display panel 110 for red, green, and blue colors.

[0189] Fig.13 (b) illustrates the distribution of the first compensation data generated by performing regression analysis on the target data and the driving current data per sub-pixel unit to which the driving current data per block unit has been scaled, and Fig.13 (c) illustrates the distribution of final compensation data generated by performing regression analysis on the first compensation data and the guidance data. Fig.13 (d) illustrates the distribution of target data.

[0190] like Fig.13 As shown, it can be identified that, compared with the first compensation data generated using only the target data corresponding to the target brightness of the display panel 110 (case (b)), by using the target data together with the guidance data corresponding to the degradation state of the display panel 110 (case (c)), the brightness deviation can be alleviated and the uniformity between adjacent sub-pixels can be further enhanced.

[0191] For reference, Fig.13 (e) illustrates the deviation between the first compensation data (case (b)) and the target data (case (d)), and Fig.13 (f) illustrates the deviation between the final compensated data (case (c)) and the target data (case (d)).

[0192] As described above, the display driving method according to the embodiment of the present disclosure can calculate the final compensation data at high speed by using the driving current data of each block unit, and can generate the final compensation data by target data and guidance data, thereby reducing the deviation between adjacent sub-pixels SP and enhancing the uniformity and the effect of compensating the characteristic value of the driving transistor DRT.

[0193] The above-mentioned embodiment is briefly described below.

[0194] The display driving method according to an embodiment of the present disclosure may include: a step S100 of detecting a driving current of each unit of a display panel 110 including a plurality of sub-pixels SP; a step S300 of scaling the driving current data of each unit into driving current data of each sub-pixel unit; a step S400 of calculating first compensation data by comparing the driving current data of each sub-pixel unit with target data; a step S500 of calculating final compensation data by comparing the first compensation data with guidance data; and a step S600 of compensating characteristic values ​​of a plurality of sub-pixels based on the final compensation data.

[0195] The display driving method according to the embodiment of the present disclosure may further include a step S200 of comparing the driving current of each block unit with the driving current of each block unit detected at a previous time after the driving current of each block unit is detected.

[0196] The display driving method according to an embodiment of the present disclosure may perform subsequent processing only when the magnitude of the driving current per block unit is smaller than the magnitude of the driving current per block unit detected at a previous time.

[0197] The scaling step S300 may be performed by at least one of linear interpolation, bicubic interpolation, or spline interpolation.

[0198] The target data may correspond to brightness data set for the plurality of sub-pixels SP when the display panel 110 is marketed.

[0199] The guide data may correspond to brightness data set by applying a turn-off sensing process of the display panel 110 in which characteristic value sensing is performed while the data voltage Vdata is blocked when a power-off signal is generated in the display panel 110 , or a real-time sensing process.

[0200] The target data may correspond to brightness data set through a turn-off sensing process in which characteristic value sensing is performed while the data voltage Vdata is blocked when a power-off signal is generated in the display panel 110 .

[0201] The guide data may correspond to brightness data set by applying a real-time sensing process of the display panel 110 .

[0202] The step of calculating the first compensation data and the step of calculating the final compensation data may be performed by regression analysis.

[0203] The step of calculating the final compensation data may include determining the kth final compensation data D according to the following formula: out,k :

[0204] D out，k =p n Gk +q n

[0205] Among them, G k is the kth guidance data, p n is the weight, and q n is bias.

[0206] The kth final compensation data D out,k In the equation, the weight p n and bias q n The loss function E(p n ,q n ) is minimized:

[0207]

[0208] Among them, D in,k is the kth first compensation data, and λ is an adjustment term.

[0209] In the loss function E(p n ,q n ), the weight p n and bias q n It can be determined by the following formula:

[0210]

[0211] Here, S n is a kernel consisting of n guiding data, m n is the average guidance data, σ n It is nuclear S n The standard deviation of the guidance data, and is the average first compensation data.

[0212] A display device according to an embodiment of the present disclosure may include: a display panel 110, in which a plurality of sub-pixels SP are arranged; a data driving circuit 130, which is configured to provide a data voltage Vdata to the display panel 110; a power management circuit 150, which is configured to provide a driving current to the display panel 110 through a driving voltage line DVL; a driving current detection circuit 170, which is configured to detect the driving current of each block unit of the display panel 110; and a timing controller 140, which is configured to scale the driving current data of each block unit generated by the driving current detection circuit 170 into driving current data of each sub-pixel unit, calculate first compensation data by comparing the driving current data of each sub-pixel unit with target data, calculate final compensation data by comparing the first compensation data with guidance data, and compensate for characteristic values ​​of multiple sub-pixels based on the final compensation data.

[0213] The driving current detection circuit 170 may include: a current sensing resistor Rs, which is connected between a terminal to which the driving current is provided and the data driving circuit 130; an operational amplifier 172, which is connected to two opposite ends of the current sensing resistor Rs to sense and amplify a bias voltage applied to the two opposite ends of the current sensing resistor Rs; and an analog-to-digital converter 174, which generates driving current data for each block unit based on the bias voltage amplified by the operational amplifier 172.

[0214] The display device 100 may further include a switching circuit 160 configured to bypass the driving current to the driving voltage line during a display driving period in which an image is displayed on the display panel 110 , and to transmit the driving current to the driving current detection circuit 170 during a period in which no image is displayed on the display panel 110 .

[0215] The target data may correspond to brightness data set for the plurality of sub-pixels SP when the display panel 110 is marketed.

[0216] The guide data may correspond to brightness data set by applying a turn-off sensing process of the display panel 110 in which characteristic value sensing is performed while the data voltage Vdata is blocked when a power-off signal is generated in the display panel 110 , or a real-time sensing process.

[0217] The target data may correspond to brightness data set through a turn-off sensing process in which characteristic value sensing is performed while the data voltage Vdata is blocked when a power-off signal is generated in the display panel 110 .

[0218] The guide data may correspond to brightness data set by applying a real-time sensing process of the display panel 110 .

[0219] The first compensation data and the final compensation data may be determined by regression analysis.

[0220] The above description is given to enable those skilled in the art to implement and use the technical ideas of the present disclosure, and is provided in the context of specific applications and their requirements. Various modifications, additions and substitutions to the described embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present disclosure. The above description and accompanying drawings provide examples of the technical ideas of the present disclosure for illustrative purposes only. That is, the disclosed embodiments are intended to illustrate the scope of the technical ideas of the present disclosure. Therefore, the scope of the present disclosure is not limited to the embodiments shown, but conforms to the widest scope consistent with the claims. The scope of protection of the present disclosure should be interpreted based on the attached claims, and all technical ideas within the scope of their equivalents should be interpreted as included within the scope of the present disclosure.

[0221] CROSS-REFERENCE TO RELATED APPLICATIONS

[0222] This application claims priority to Korean Patent Application No. 10-2021-0123330, filed on September 15, 2021, which is hereby incorporated by reference for all purposes as if fully set forth herein.

Claims

1. A display driving method, the display driving method comprising the following steps: detecting a driving current of each unit of a display panel including a plurality of sub-pixels; Scaling the driving current data of each block unit into the driving current data of each sub-pixel unit; Calculating first compensation data by comparing the driving current data of each sub-pixel unit with target data; calculating final compensation data by comparing the first compensation data with guidance data; as well as compensating the characteristic values ​​of the plurality of sub-pixels based on the final compensation data, The step of calculating the final compensation data includes determining the kth final compensation data D according to the following formula: out,k : D out，k =p n G k +q n Among them, G k is the kth guidance data, p n is the weight, and q n is the bias, Among them, the weight p n and the bias q n is determined so that the kth final compensation data D is defined out,k The loss function E(p n ,q n ) is minimized, and Among them, the loss function E(p n ,q n ) is limited to Among them, D in,k is the kth first compensation data, λ is an adjustment term, and S n is a kernel consisting of n guiding data.

2. The display driving method according to claim 1, further comprising the following steps: After the driving current of each block unit is detected, the driving current of each block unit is compared with the driving current of each block unit detected at a previous time.

3. The display driving method according to claim 2, wherein: Only when the magnitude of the driving current per block unit is smaller than the magnitude of the driving current per block unit detected at the previous time, the subsequent process is performed.

4. The display driving method according to claim 1, wherein: The scaling step is performed by at least one of linear interpolation, bicubic interpolation, or spline interpolation.

5. The display driving method according to claim 1, wherein: The target data corresponds to brightness data set for the plurality of sub-pixels when the display panel is marketed.

6. The display driving method according to claim 5, wherein: The guide data corresponds to brightness data set by applying a turn-off sensing process or a real-time sensing process of the display panel in which characteristic value sensing is performed with a data voltage blocked when a power-off signal is generated in the display panel.

7. The display driving method according to claim 1, wherein: The target data corresponds to brightness data set through a turn-off sensing process in which characteristic value sensing is performed with a data voltage blocked when a power-off signal is generated in the display panel.

8. The display driving method according to claim 7, wherein: The guide data corresponds to brightness data set by applying a real-time sensing process of the display panel.

9. The display driving method according to claim 1, wherein: The step of calculating the first compensation data and the step of calculating the final compensation data are performed by regression analysis.

10. The display driving method according to claim 1, wherein: In the loss function E(p n ,q n )middle, The weight p n and the bias q n Determined by the following formula: Among them, m n is the average guidance data, σ n is the core S n The standard deviation of the guidance data, and is the average first compensation data.

11. A display device, comprising: A display panel, the display panel comprising a plurality of sub-pixels; a data driving circuit configured to provide a data voltage to the display panel; a power management circuit configured to provide a driving current to the display panel through a driving voltage line; a driving current detection circuit, the driving current detection circuit being configured to detect a driving current of each unit of the display panel; as well as a timing controller configured to scale the driving current data per block unit generated by the driving current detection circuit into driving current data per sub-pixel unit, calculate first compensation data by comparing the driving current data per sub-pixel unit with target data, calculate final compensation data by comparing the first compensation data with guidance data, and compensate the characteristic values ​​of the plurality of sub-pixels based on the final compensation data, The calculation of the final compensation data includes determining the kth final compensation data D according to the following formula: out,k : D out，k =p n G k +q n Among them, G k is the kth guidance data, p n is the weight, and q n is the bias, Among them, the weight p n and the bias q n is determined so that the kth final compensation data D is defined out,k The loss function E(p n ,q n ) is minimized, and Among them, the loss function E(p n ,q n ) is limited to Among them, D in,k is the kth first compensation data, λ is an adjustment term, and S n is a kernel consisting of n guiding data.

12. The display device according to claim 11, wherein: The driving current detection circuit comprises: a current sensing resistor connected between a terminal to which the driving current is supplied and the data driving circuit; an operational amplifier connected to two opposite ends of the current sensing resistor to sense and amplify a bias voltage applied to the two opposite ends of the current sensing resistor; and An analog-to-digital converter is configured to generate driving current data of each block unit based on the bias voltage amplified by the operational amplifier.

13. The display device according to claim 11, further comprising: A switch circuit is configured to bypass the drive current to the drive voltage line during a display drive period in which an image is displayed on the display panel, and transmit the drive current to the drive current detection circuit during a period in which no image is displayed on the display panel.

14. The display device according to claim 11, wherein: The target data corresponds to brightness data set for the plurality of sub-pixels when the display panel is marketed.

15. The display device according to claim 14, wherein: The guide data corresponds to brightness data set by applying a turn-off sensing process or a real-time sensing process of the display panel in which characteristic value sensing is performed with a data voltage blocked when a power-off signal is generated in the display panel.

16. The display device according to claim 11, wherein: The target data corresponds to brightness data set through a turn-off sensing process in which characteristic value sensing is performed with a data voltage blocked when a power-off signal is generated in the display panel.

17. The display device according to claim 16, wherein: The guide data corresponds to brightness data set by applying a real-time sensing process of the display panel.

18. The display device according to claim 11, wherein: The first compensation data and the final compensation data are determined by regression analysis.

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