KR20160089913A - Display device and the method for driving the same - Google Patents

Abstract

The present invention relates to a display device and an operation method thereof. The purpose of the present invention is to provide a display device capable of preventing abnormalities in a screen without having an effect on a sensing operation and a screen operation, even if a sensing time becomes longer. The display device comprises: a display panel; a source driver; a scan driver; and a timing controller.

Description

DISPLAY DEVICE AND METHOD FOR DRIVING THE SAME

The present embodiments relate to a display device and a driving method thereof.

BACKGROUND ART Demands for a display device for displaying an image have been increasing in various forms as an information society has developed. Recently, a liquid crystal display device, a plasma display device, an organic light emitting display device Organic Light Emitting Display Device) are being utilized.

Such a display device includes a display panel in which data lines and gate lines are arranged and in which subpixels are arranged, a data driver for driving the data lines, and a gate driver for driving the gate lines sequentially.

A circuit element such as a transistor is arranged in each sub-pixel arranged on the display panel of such a display device. When the display device is an organic light emitting display device, circuit elements such as transistors, organic light emitting diodes, and the like may be disposed in each sub pixel.

A circuit element such as a transistor disposed in each subpixel has inherent characteristic values (e.g., threshold voltage, mobility), and there is a characteristic value deviation between circuit elements in each subpixel, so that luminance deviation between subpixels may occur.

Therefore, a technology has been developed to sense and compensate for the characteristic value deviation between circuit elements in each subpixel.

However, it may take a considerable amount of time to sense the characteristic value for the subpixel. Therefore, the time actually taken at the time of sensing may be much longer than the time prepared for sensing.

In such a case, the long sensing time affects the screen driving and may cause a screen anomaly that is unexpected.

An object of the embodiments is to provide a display device and a method of driving the same that do not cause a problem such as a sensing operation and a screen drive even if a long time is required for sensing.

Another object of the present invention is to provide a display device and a method of driving the same that can prevent a screen image from being affected by a sensing operation.

Another object of the present invention is to provide a display device and a driving method thereof that can prevent unnecessary and meaningless sensing.

One embodiment includes a display panel in which a plurality of data lines and a plurality of gate lines are arranged and in which a plurality of subpixels are arranged in a matrix type, a source driver for driving a plurality of data lines, There can be provided a display device including a scan driver and a timing controller for outputting a control signal for controlling the operation timings of the source driver and the scan driver.

In such a display device, a scan signal is supplied to at least one gate line among a plurality of gate lines in at least one specific blank time interval on the synchronization signal, and in a specific active time interval subsequent to a specific blank time interval, The displayed frame can be maintained.

Another embodiment is a display device including a display panel in which a plurality of data lines and a plurality of gate lines are arranged and in which a plurality of subpixels are arranged in a matrix type, a source driver for driving a plurality of data lines, A method of driving a display device including a scan driver can be provided.

A method of driving such a display device includes sequentially driving a plurality of gate lines to display a first frame during a first active time interval and displaying a plurality of gate lines during a first blank time interval subsequent to a first active time interval, Sensing at least one subpixel by driving at least one gate line of the gate lines during a first active time interval; sensing the at least one subpixel by driving at least one of the gate lines during a second active time interval following the first blank time interval; Maintaining the first frame, and so on.

The driving method of the display device may further include the step of selecting the first blank time period as the sensing period before or after the step of displaying the first frame.

According to the embodiments as described above, it is possible to provide a display device and a driving method thereof that do not cause problems such as sensing operation and screen driving even if a long time is required for sensing.

According to the embodiments, it is possible to provide a display device and a method of driving the same that can prevent the screen from being affected by the sensing and cause the screen abnormal phenomenon.

According to the embodiments, it is possible to provide a display device and a driving method thereof that can prevent unnecessary and meaningless sensing.

1 is a schematic system configuration diagram of a display apparatus according to the present embodiments.
2 is an exemplary view of a subpixel structure in a display device according to the present embodiments.
3 is an exemplary diagram of a subpixel compensation circuit in a display device according to the present embodiments.
4 is a diagram for explaining a method of sensing a threshold voltage of a driving transistor in a subpixel in a display device according to the present embodiments.
5 is a diagram for explaining a method of sensing the mobility of driving transistors in sub-pixels in the display device according to the present embodiments.
6 is a diagram showing sensing timing in the display device according to the present embodiments.
7 is a diagram showing the timing of real-time sensing in the display device according to the present embodiments.
FIG. 8 is a timing chart of a scan signal for real-time sensing for each blank time interval in the display device according to the present embodiments.
FIG. 9 is a diagram illustrating a sensing time shortage phenomenon that may occur when real-time sensing is performed for each blank time interval in the display device according to the present embodiments.
10 is a timing diagram of a scan signal for real time sensing in a blank time interval selected as a sensing interval in the display device according to the present embodiments.
11 is a diagram illustrating a periodic sensing method in the display device according to the present embodiments.
12 is a diagram illustrating an aperiodic sensing method in a display device according to the present embodiments.
13 is a diagram showing an example of an aperiodic sensing method in a display device according to the present embodiments.
14 is a block diagram of the timing controller of the display device according to the present embodiments.
15 is a timing chart for an output signal of the internal configurations of the timing controller of the display device according to the present embodiments.
16 is a flowchart of a method of driving a display device according to the present embodiments.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the components from other components, and the terms do not limit the nature, order, order, or number of the components. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; intervening "or that each component may be" connected, "" coupled, "or " connected" through other components.

1 is a schematic system configuration diagram of a display apparatus 100 according to the present embodiments.

Referring to FIG. 1, a display device 100 according to the present embodiment includes a plurality of data lines DL and a plurality of gate lines GL, and a plurality of sub- A source driver 120 for driving a plurality of data lines DL, a scan driver 130 for driving a plurality of gate lines, a source driver 120 and a scan driver 130, A timing controller 140 for controlling the operation timings of the first and second processors 130 and 130, and the like.

The source driver 120 drives a plurality of data lines by supplying data voltages to the plurality of data lines. Here, the source driver 120 is also referred to as a "data driver ".

The scan driver 130 sequentially drives the plurality of gate lines by sequentially supplying scan signals to the plurality of gate lines. Here, the scan driver 130 is also referred to as a "gate driver ".

The timing controller 140 supplies various control signals to the source driver 120 and the scan driver 130 to control the source driver 120 and the scan driver 130.

The timing controller 140 starts scanning in accordance with the timing implemented in each frame, switches the input image data input from the outside according to the data signal format used by the source driver 120, and outputs the converted image data to the output And controls the data driving at a suitable time according to the scan.

The scan driver 130 sequentially drives a plurality of gate lines by sequentially supplying scan signals of an On voltage or Off voltage to a plurality of gate lines under the control of the timing controller 140 .

1, the scan driver 130 may be located on only one side of the display panel 110, or may be located on both sides, depending on the driving method.

In addition, the scan driver 130 may include one or more gate driver integrated circuits (GDICs).

The at least one scan driver integrated circuit included in the scan driver 130 may be connected to a bonding pad of the display panel 110 by a Tape Automated Bonding (TAB) method or a chip on glass (COG) Or may be implemented as a GIP (Gate In Panel) type and directly disposed on the display panel 110, or may be integrated and disposed on the display panel 110, as the case may be.

Each of the one or more scan driver integrated circuits included in the scan driver 130 may include a shift register, a level shifter, and the like.

When the specific gate line is opened, the source driver 120 converts the image data received from the timing controller 140 into an analog data voltage and supplies it to the data lines, thereby driving the plurality of data lines.

The source driver 120 may drive a plurality of data lines including at least one source driver integrated circuit (SDIC).

At least one source driver integrated circuit included in the source driver 120 is connected to a bonding pad of the display panel 110 by a tape automated bonding (TAB) method or a chip on glass (COG) Or may be disposed directly on the display panel 110, or may be integrated and disposed on the display panel 110 as occasion demands.

Each source driver integrated circuit included in the source driver 120 may include a logic unit including a shift register and a latch circuit, a digital analog converter (DAC), an output buffer, and the like. (Sensor) for sensing the characteristics of the subpixel in order to compensate for the characteristics of the subpixel (e.g., the threshold voltage and the mobility of the driving transistor, the threshold voltage of the organic light emitting diode, the luminance of the subpixel, etc.) .

In addition, each source driver integrated circuit included in the source driver 120 may be implemented by a chip on film (COF) method.

In this case, one end of each source driver integrated circuit is bonded to at least one source printed circuit board, and the other end is bonded to the display panel 110.

On the other hand, the timing controller 140 controls the timing controller 140 to output the vertical synchronizing signal VSYNC, the horizontal synchronizing signal HSYNC, the input data enable signal DE, the clock signal CLK, And receives various timing signals from the outside (e.g., the host system).

The timing controller 140 may control the source driver 120 and the scan driver 130 in addition to outputting the converted video data by switching the input video data inputted from the outside according to the data signal format used by the source driver 120 A timing signal such as a vertical synchronization signal VSYNC, a horizontal synchronization signal HSYNC, an input DE signal and a clock signal and generates various control signals to control the source driver 120 and the scan driver 130 .

For example, in order to control the scan driver 130, the timing controller 140 generates a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal GOE : Gate Output Enable), and the like.

Here, the gate start pulse GSP controls the operation start timing of one or more scan driver integrated circuits constituting the scan driver 130. The gate shift clock GSC is a clock signal commonly input to one or more scan driver integrated circuits, and controls the shift timing of the scan signal (gate pulse). The gate output enable signal GOE specifies the timing information of one or more scan driver integrated circuits.

The timing controller 140 includes a source start pulse SSP, a source sampling clock SSC and a source output enable signal SOE to control the source driver 120. [ Output enable (DCS) data control signals.

Here, the source start pulse SSP controls the data sampling start timing of one or more source driver integrated circuits constituting the source driver 120. The source sampling clock SSC is a clock signal for controlling sampling timing of data in each of the source driver integrated circuits. The source output enable signal SOE controls the output timing of the source driver 120. [

1, the timing controller 140 is connected to a source printed circuit board to which a source driver integrated circuit is bonded and a connection medium such as a flexible flat cable (FFC) or a flexible printed circuit (FPC) To a control printed circuit board (PCB) connected via a printed circuit board (PCB).

A power controller (not shown) for controlling various voltages or currents to supply or supply various voltages or currents to the display panel 110, the source driver 120, the scan driver 130, . These power controllers are also referred to as power management ICs (PMICs).

The source printed circuit board and the control printed circuit board mentioned above may be a single printed circuit board.

The display device 100 according to the present exemplary embodiment may be one of a liquid crystal display device, a plasma display device, an organic light emitting display device, .

A circuit element such as a transistor, a capacitor, or the like may be disposed in each of the plurality of subpixels arranged in the display panel 110 of the display apparatus 100.

For example, when the display panel 110 is an organic light emitting display panel, each subpixel may be composed of an organic light emitting diode (OLED), two or more transistors, at least one capacitor, have.

The types and the number of the circuit elements constituting each subpixel can be variously determined depending on a providing function, a design method, and the like.

2 is an exemplary view of a subpixel structure in the display device 100 according to the present embodiments.

Referring to FIG. 2, when the display device 100 according to the present embodiment is an organic light emitting display, each subpixel SP disposed on the display panel 110 includes an organic light emitting diode (OLED) A driving transistor DRT for driving the light emitting diode OLED and a driving transistor DRT electrically connected between the N2 node (gate node) and the data line DL of the driving transistor DRT, A switching transistor SWT for transferring a data voltage Vdata to a source node N1 of the driving transistor DRT and a source node N2 of the driving transistor DRT, And a storage capacitor (Cstg: Storage Capacitor) electrically connected between the gate electrode and the gate electrode.

Referring to FIG. 2, the organic light emitting diode OLED includes a first electrode (e.g., an anode electrode or a cathode electrode), an organic layer, and a second electrode (e.g., a cathode electrode or an anode electrode).

For example, the first electrode of the organic light emitting diode OLED may be connected to the N1 node of the driving transistor DRT, and the second electrode of the organic light emitting diode OLED may be grounded.

2, the driving transistor DRT is a transistor for driving the organic light emitting diode OLED by supplying driving current to the organic light emitting diode OLED. The driving transistor DRT includes an N1 node corresponding to a source node or a drain node, N2 node corresponding to the node, and N3 node corresponding to the drain node or the source node.

For example, in this driving transistor DRT, the N1 node may be electrically connected to the first electrode or the second electrode of the organic light emitting diode OLED, and the N2 node may be a source node or a drain node of the switching transistor SWT And the node N3 may be electrically connected to the driving voltage line DVL for supplying the driving voltage EVDD.

2, the switching transistor SWT is a transistor for transferring the data voltage Vdata to the N2 node corresponding to the gate node of the driving transistor DRT. The N2 node of the driving transistor DRT and the data line DL and is turned on by the scan signal SCAN applied to the gate node to transfer the data voltage Vdata to the node N2 of the driving transistor DRT. Here, the data voltage Vdata may be a data voltage for display driving when the driving mode is the display driving mode, and a sensing data voltage when the driving mode is the sensing driving mode.

Referring to FIG. 2, the storage capacitor Cstg may be electrically connected between the nodes N1 and N2 of the driving transistor DRT to maintain a constant voltage for one frame time.

2, each subpixel SP of the display device 100 according to the present embodiment is configured to supply a reference voltage Vref to the N1 node (source node or drain node) of the driving transistor DRT Or may further comprise a sensing transistor SENT (Sensing Transistor) for sensing a characteristic value (for example, threshold voltage, mobility) of the driving transistor DRT, as will be described later.

This sensing transistor SENT is electrically connected between the N1 node (source node or drain node) of the driving transistor DRT and a reference voltage line RVL (reference voltage line) for supplying the reference voltage Vref.

The sensing transistor SENT may be controlled by a sense signal SENSE which is a type of a scan signal applied to the gate node.

The sensing transistor SENT may be turned on to apply the reference voltage Vref supplied through the reference voltage line RVL to the node N1 of the driving transistor DRT.

Referring to FIG. 2, the gate node of the switching transistor SWT and the gate node of the sensing transistor SENT may be electrically connected to the same gate line. In other words, gate signals SCAN and SENSE are commonly applied to the gate node of the switching transistor SWT and the gate node of the sensing transistor SENT through the same gate line GL. At this time, the scan signal SCAN and the sense signal SENSE are the same gate signal.

Alternatively, the gate node of the switching transistor SWT and the gate node of the sensing transistor SENT may be electrically connected to different gate lines. In this case, each of the scan signal SCAN and the sense signal SENSE may be separately applied to the gate node of the switching transistor SWT and the gate node of the sensing transistor SENT through different gate lines.

On the other hand, each driving transistor DRT has a characteristic value such as a threshold voltage (Vth) and a mobility. In addition, the driving transistor DRT may be degraded according to the driving time, and the characteristic value may be changed.

For this reason, there may be a difference in degree of deterioration between the driving transistors DRT in each sub-pixel, and there may be a characteristic value deviation between the driving transistors DRT in each pixel.

The characteristic value deviation between the driving transistors DRT in each sub-pixel may cause a luminance deviation between each sub-pixel, which may be a main factor causing image quality degradation.

There may be not only a characteristic value deviation (threshold voltage deviation, mobility deviation) between the driving transistors DRT but also a characteristic value deviation (threshold voltage deviation, etc.) between the organic light emitting diodes OLED.

In this specification, the characteristic value deviation between the driving transistors DRT and the characteristic value deviation between the organic light emitting diodes (OLED) are collectively referred to as "sub pixel characteristic value deviation ".

Therefore, in order to improve image quality, it is necessary to compensate for the deviation of sub-pixel characteristic values.

Therefore, the display device 100 according to the present embodiment has a sub-pixel structure as shown in Fig. 2, and also has a sub-pixel characteristic value deviation (characteristic value deviation of the driving transistor DRT, characteristic value of the organic light emitting diode OLED To compensate for the deviation of the subpixel characteristic values, as shown in Fig.

3 is an exemplary diagram of a subpixel compensation circuit in the display device 100 according to the present embodiments.

Referring to FIG. 3, the display device 100 according to the present embodiment includes not only a sensing transistor SENT in each sub-pixel, but also a sensing transistor SEN in each sub-pixel for sensing operation (threshold voltage sensing, mobility sensing) (Threshold voltage, mobility) of the driving transistor DRT in each subpixel or a sensing configuration for measuring the characteristic value (threshold voltage) of the organic light emitting diode OLED.

Referring to FIG. 3, the display device 100 according to the present embodiment includes, as a sensing configuration, an analog digital converter (ADC) that performs an actual sensing function, a switch configuration for controlling a sensing operation, , A reference voltage line (RVL) serving as a sensing line, and the like.

3, the analog-to-digital converter (ADC) senses the voltage of the reference voltage line RVL, converts the sensed voltage into a digital value to generate sensing data, and outputs the sensed data to the timing controller 140 ).

Here, sensing the voltage of the reference voltage line RVL may have the same meaning as sensing the voltage of the node N1 of the driving transistor DRT.

Referring to FIG. 3, the display device 100 according to the present embodiment may include a sample switch (SAM), a pre-switch (SPRE), and the like, as a switch configuration for controlling a sensing operation.

Referring to Fig. 3, the pre-switch SPRE can switch the connection between the reference voltage line RVL and the supply node Nref of the reference voltage Vref in accordance with the switching signal.

When the pre-switch SPRE is turned on, the reference voltage Vref is supplied to the reference voltage line RVL. When the pre-switch SPRE is turned off, the reference voltage Vref is not supplied to the reference voltage line RVL Do not.

When the pre-switch SPRE is turned on and the reference voltage Vref is supplied to the reference voltage line RVL, the node N1 of the driving transistor DRT is turned on through the sensing transistor SENT, which is turned on, Vref.

Referring to FIG. 3, the sample switch SAM can switch the connection between the reference voltage line RVL and the analog-to-digital converter (ADC) according to the switching signal (sampling signal).

When the sample switch (SAM) is turned on, the reference voltage line (RVL) and the analog-to-digital converter (ADC) are connected.

Thus, the analog-to-digital converter (ADC) can sense the voltage of the reference voltage line (RVL).

That is, the analog-to-digital converter (ADC) is able to sense the voltage of the N1 node of the driving transistor DRT through the reference voltage line RVL.

At this time, the analog-to-digital converter (ADC) converts the electric signal (Cline) stored in the line capacitor (Cline) corresponding to the parasitic capacitor component existing in the line capacitor Cline electrically connected to the reference voltage line (RVL) (Voltage) to sense the voltage of the reference voltage line RVL, that is, the voltage of the node N1 of the driving transistor DRT.

The reference voltage line RVL serves not only as a path for transmitting the reference voltage Vref to the N1 node of the driving transistor DRT but also for driving the driving transistor DRT The node N1 of the path drive transistor DRT for sensing the voltage of the node N1 of the node N1.

3, the timing controller 140 receives the sensing data output from the analog-to-digital converter (ADC) and can determine the characteristic value of the driving transistor DRT or the characteristic value deviation between the driving transistors DRT based on the received sensing data. Based on this, the compensation value for compensating the characteristic value deviation is calculated and stored, and the data compensation process for changing the image data for the corresponding subpixel can be performed.

With respect to the sensing method for the threshold voltage of the driving transistor DRT and the sensing method for the mobility of the driving transistor DRT among the sub-pixel characteristic values using such a sub-pixel compensation circuit, referring to Figs. 4 and 5 Brief description will be given. 4 and 5, it is assumed that the N1 node of the driving transistor DRT is the source node.

FIG. 4 is a diagram for explaining a method of sensing a threshold voltage of a driving transistor DRT in a sub-pixel in the display device 100 according to the present embodiments.

4, after the N1 node and the N2 node of the driving transistor DRT are initialized to the data voltage Vdata and the reference voltage Vref, the N1 node of the driving transistor DRT is floated , The voltage Vs of the node N1 of the driving transistor DRT follows the voltage Vg of the node N2.

Accordingly, the voltage Vs of the N1 node of the driving transistor DRT is boosted toward the voltage (Vg = Vdata) of the N2 node and saturated when the voltage becomes a constant voltage.

The voltage Vs of the node N1 of the driving transistor DRT is sensed as the sensing voltage Vsense after the voltage Vs of the node N1 of the driving transistor DRT has saturated.

At this time, the sensing voltage Vsense may be represented by a known data voltage Vdata and a threshold voltage Vth to be known. That is, the sensing voltage Vsense can be expressed as follows.

Vsense = Vdata-Vth (Vth: may be a positive value or a negative value)

Therefore, the threshold voltage Vth of the driving transistor DRT can be grasped and the threshold voltage deviation? Vth between the driving transistors DRT can be grasped based on the sensing voltage Vsense.

That is, the threshold voltage Vth of the driving transistor DRT can be calculated by determining the difference (Vdata- (Vdata-Vth) = Vth) of the sensing voltage Vsense measured at the already known data voltage Vdata.

The difference (Vsense1-Vsense2 = (Vdata-Vth1) - (Vdata-Vth2) = Vth2-Vth2 =? Vth) of the sensing voltages Vsense1 and Vsense2 sensed in two subpixels is calculated, (Vth) between the driving transistors of the transistors Tr1 and Tr2.

The threshold voltage sensing of the driving transistor DRT as described above may take a long time because the time required for the N1 node of the driving transistor DRT to saturate is required.

Therefore, the threshold voltage sensing can be performed, for example, in the case where a power off signal occurs (power off signal) so as not to interfere with the viewing of the user and not to deteriorate the image quality.

5 is a view for explaining a method of sensing the mobility of the driving transistor DRT in the sub-pixel in the display device 100 according to the present embodiments.

5, a constant voltage (Vdata + DELTA Vsense) is applied to the N2 node (gate node) of the driving transistor DRT in order to define a current capability characteristic excluding the threshold voltage Vth of the driving transistor DRT .

Thus, the current capability (i.e., mobility) of the driving transistor DRT can be relatively grasped through the amount of voltage V DELTA V charged for a predetermined period of time, thereby obtaining a correction gain Gain for compensation I will.

The above-described mobility sensing takes a relatively short time compared to the threshold voltage sensing described in Fig.

Because of this short time-consuming characteristic, the mobility sensing and compensation can be performed in real time by taking a certain amount of time in driving the screen. By doing so, the parameters of the driving transistor DRT varying in real time can be sensed and compensated.

During the sensing of the threshold voltage and the sensing of the mobility, the data voltage for sensing driving is applied to the gate node of the driving transistor DRT. Due to the data voltage for sensing driving, A phenomenon may occur.

Therefore, when the threshold voltage sensing and the mobility sensing are completed, the display driving data voltage applied to the gate node of the driving transistor DRT may be applied again before the threshold voltage sensing and the mobility sensing. Through this recovery procedure, it is possible to prevent a screen abnormal phenomenon from occurring.

Considering the time (recovery time) required for the above-described recovery procedure, the total time required for each of the threshold voltage sensing and mobility sensing will be the sum of the sensing time and the recovery time.

Fig. 6 is a diagram showing the sensing timing in the display device 100 according to the present embodiments.

6, when a power-on signal is generated, the display device 100 displays an image by driving the screen. When a power-off signal occurs according to a user input or the like, And performs a power off process (Power Off Process).

Referring to FIG. 6, the sensing of the sub-pixel characteristic value may be performed for a certain period of time while the screen is being driven until a power off signal is generated after the power on signal is generated And can proceed in real time. Hereinafter, such sensing is referred to as real time sensing (RTS).

Further, the sensing for the sub-pixel characteristic value may proceed after the power off signal occurs. In the following, this sensing is called Off Time Sensing.

As described above, the threshold voltage sensing requires a relatively long sensing time compared to the mobility sensing.

Therefore, the threshold voltage sensing can proceed to off-time sensing that can secure a relatively long sensing time. Mobility sensing can proceed with real-time sensing, which makes it difficult to secure a relatively long sensing time.

Of course, the opposite way is also possible. That is, the threshold voltage sensing may proceed to real time sensing, and the mobility sensing may proceed to off-time sensing.

Also, threshold voltage sensing and mobility sensing may be performed in both off-time sensing and real-time sensing.

Fig. 7 is a diagram showing the real-time sensing timing in the display device 100 according to the present embodiments.

The timing controller 140 may use the vertical synchronization signal VSYNC to control the operation timings of the source driver 120 and the scan driver 130. [

The vertical synchronization signal VSYNC has an active time (also referred to as a display time) section corresponding to a screen display section and a blank time section in which a screen is not displayed in one frame period It is a repeated signal.

As shown in FIG. 7, the real-time sensing can be performed in each of the blank time periods in which the screen is not displayed in the vertical synchronization signal VSYNC.

FIG. 8 is a timing diagram of a scan signal for performing real-time sensing for each blank time interval in the display device 100 according to the present embodiments.

8 shows a case in which when the four frames are driven, the scan signal SCAN (1) output from the gate line (i.e., the gate line) when displaying the frame 1, the frame 2, the frame 3 and the frame 4 ), SCAN (2), SCAN (3), SCAN (4)).

Referring to FIG. 8, the gate lines are sequentially driven for the sub-pixel rows (lines) during the active time period corresponding to each frame, that is, during the display enable time.

Further, for real-time sensing, a gate line corresponding to one subpixel row (line) may be driven for each blank time interval. At this time, if there is a time margin, the gate lines corresponding to two or more subpixel rows (lines) may be sequentially driven.

Through the gate line driving for real-time sensing, the scan signal SCAN can be applied to the gate node of the switching transistor SWT in the corresponding sub-pixel.

As described above, assuming that a gate line corresponding to one subpixel row (line) is driven for each blank time interval, it is included in one subpixel row through one sensing process for each blank time interval The subpixel characteristic value or the deviation thereof can be sensed.

On the other hand, all the subpixels included in the corresponding subpixel row (sensing subject line) may be sensed through one sensing process for each blank time segment, and a portion of the subpixel row included in the corresponding subpixel row The subpixels may be sensed.

This may be different depending on whether the reference voltage lines RVL shown in FIG. 3 are arranged one by one for each subpixel column or one for each two, three, or four or more subpixel columns.

For example, when the reference voltage line RVL has a wiring structure in which one reference line is arranged for each subpixel row, the reference voltage line RVL is included in the corresponding subpixel row (sensing subject line) through one sensing process for each blank time interval All the subpixels that have been detected can be sensed.

As another example, in the case where the reference voltage line RVL has a shared wiring structure in which one line is arranged for each of four sub-pixel columns, the corresponding sub-pixel line (line to be sensed) Only one quarter of all subpixels included in the subpixel can be sensed. Here, the four subpixel columns correspond to the red subpixel column, the white subpixel column, the green subpixel column, and the blue subpixel column, the reference voltage line RVL corresponds to the second subpixel column in the four subpixel columns, And may be disposed between the third sub-pixel columns.

FIG. 9 is a diagram illustrating a sensing time shortage phenomenon that may occur when real-time sensing is performed for each blank time interval in the display device 100 according to the present embodiments.

Referring to FIG. 9, when real-time sensing is performed for one subpixel row (sensing subject line) for each blank time interval described above, the gate line corresponding to the corresponding subpixel row (sensing subject line) The necessary scan signal must be supplied.

9, each active time interval AT1, AT2, and AT3 on the vertical synchronization signal VSYNC for driving each of the frames Frame (i-1), Frame (i) N scan signals SCAN (1), ..., SCAN (N)) are sequentially supplied to N gate lines.

Referring to FIG. 9, real-time sensing is performed for each of the blank time intervals BT1, BT2, and BT3 between the active time intervals AT1, AT2, and AT3.

For example, assuming that the frame i is driven during the active time interval AT2 and that sensing for the nth subpixel row proceeds during the blank time interval BT2 after such frame driving is completed, n Th scan line (SCAN (n)) necessary for sensing.

In order for real-time sensing to be normally performed and not to affect the driving of the next frame (frame (i + 1)), the following condition must be satisfied.

● Total time required for real-time sensing (Tsr) = sensing time (Ts) + recovery time (Tr) <length of blank time section (Tb)

Referring to FIG. 9, the vertical synchronization signal VSYNC is constant. That is, the length Tb of the blank time interval corresponding to the width of the vertical synchronization signal VSYNC is constant.

That is, this means that the range of time available for real-time sensing is limited.

Therefore, in order to solve the visibility problem due to real-time sensing, if real-time sensing is performed in a blank time interval, the total time required for real-time sensing (Tsr = Ts + Tr) , And may be much longer than the length Tb of the blank time period (i.e., Tb << Tsr).

Therefore, even in the active time interval AT3 corresponding to the driving period of the next frame (i + 1), the real time sensing started to progress in the preceding blank time interval BT2 continues.

As a result, the display drive for the corresponding subpixel row (i.e., the subpixel row in which the nth gate line is disposed) may not be performed properly. That is, as the sensing driving of the subpixels belonging to the corresponding subpixel row to be driven for display continues, the corresponding subpixel due to the data voltage for real-time sensing driving may be abnormally driven or a screen abnormal phenomenon may occur accordingly .

In addition, abnormal display drive and screen abnormal phenomenon may occur not only in the subpixel row where the sensing is proceeding but also in other subpixel rows below.

Accordingly, the present embodiments provide a sensing method for preventing a problem such as a sensing operation and a screen drive from occurring even if the total time Tsr of the real-time sensing performed in the blank time interval is longer than the length Tb of the blank time interval, Thereby providing a driving method.

10 is a timing diagram of a scan signal for real time sensing in a blank time interval selected as a sensing interval in the display device 100 according to the present embodiments.

Referring to FIG. 10, in the present embodiment, when real-time sensing is performed on one subpixel row (line to be sensed) for every blank time interval, the total time Tsr of real- In order to solve the problem that may occur when the length of the blank time interval Tb is longer than the length of the blank time period Tb (i.e., Tb < Tsr), the blank time interval Quot; blank time period &quot;).

According to the present embodiments, the scan driver 130 applies a scan signal (at least one scan signal) to at least one of the plurality of gate lines in at least one specific blank time interval BT2 on the vertical synchronization signal VSYNC Is supplied. Here, the vertical synchronization signal VSYNC may be a signal used by the timing controller 140 to control the operation timing of the source driver 120 and / or the scan driver 130.

Accordingly, in a specific blank time interval BT2, real-time sensing is performed on the subpixels supplied with the scan signals (scan signals for sensing purposes).

Through the real-time sensing, the display device 100 senses the sub-pixel characteristic values (for example, the threshold voltage and the mobility of the driving transistor DRT) in the corresponding sub-pixels by using an analog-to-digital converter can do.

For this real-time sensing, the source driver 120 may sense the subpixel property values with one or more of the subpixels supplied with a scan signal from at least one gate line during a specific blank time interval BT2 The data voltage Vdata for sensing driving is supplied.

10, a scan signal SCAN (n) supplied to at least one gate line in a specific blank time interval BT2 is divided into an active time interval AT3 following a specific blank time interval BT2, Lt; / RTI &gt;

In other words, since the real time sensing can proceed by invading the active time interval AT3 following the specific blank time interval BT2, that is, the total time Tsr of the real time sensing is the length Tb of the blank time interval, (I + 1) in the specific active time interval (AT3) following the specific blank time interval (BT2) selected for sensing so as to sufficiently secure the sensing time Tsr , The frame (i) displayed in the previous active time interval (AT2) can be maintained and displayed continuously.

As described above, the sensing is not performed for every blank time interval, the sensing is performed only in a specific blank time interval selected as the sensing interval, and the new next frame motion is performed in a specific active time interval following the specific blank time interval A normal sensing operation can be performed even if the sensing total required time Tsr is considerably long and the screen abnormal phenomenon that has occurred by sensing during every blank time interval Can be prevented.

Meanwhile, the specific blank time period corresponding to the sensing period may be periodically displayed in accordance with a sensing cycle, or non-periodically at a specific event. Accordingly, the real-time sensing may be performed periodically or non-periodically.

Referring to FIG. 11, a periodic real time sensing method will be described, and an aperiodic real time sensing method will be described with reference to FIG. 12. Referring to FIGS. 13 to 15, An example of the method will be described.

11 is a diagram illustrating a periodic sensing method in the display device 100 according to the present embodiments.

Referring to FIG. 11, the display device 100 according to the present embodiment includes a sensing section for sensing a sub-pixel characteristic value (threshold voltage and mobility of a driving transistor) in accordance with a preset sensing cycle, (RTS) can be performed in a specific blank time interval (BT1, BT4).

Referring to FIG. 11, in each specific active time interval AT2 and AT5 following the specific blank time intervals BT1 and BT4 corresponding to the sensing interval, (I-1) and Frame (i + 1) of the already displayed frames (Frame (i-2) and Frame (i)) driven in the previous active time periods AT1 and AT4 Frame (i-2), Frame (i) already displayed in the previous active time periods AT1 and AT4.

That is, the specific active time intervals AT2 and AT5 following the specific blank time intervals BT1 and BT4 selected as the sensing intervals sufficiently secure the sensing time in the specific blank time intervals BT1 and BT4 selected as the sensing intervals Is a section selected as a "frame holding section" for retaining the frame displayed in the previous active sections AT1 and AT4 without driving the subsequent frames (Frame (i-1) and Frame (i + 1)

Referring to FIG. 11, the active periods AT2 and AT5 correspond to a frame holding period, and the active periods AT1, AT3, AT4 and AT6 correspond to a frame driving period for driving a new frame.

11 is a diagram illustrating a periodic sensing method when a sensing period in which sensing is performed once for every three blank time periods is set. The sensing period may be variously set within a range that does not affect resolution, image quality, or the like There will be.

According to the sensing period as shown in FIG. 11, the frame frequency has the same effect as that in which the frame frequency is repeatedly changed between 120 Hz and 60 Hz.

As described above, the real time sensing (RTS) is periodically performed in the selected blank time intervals (BT1 and BT4) as the sensing period according to the sensing period, the active time (RTS) following the selected blank time intervals (BT1 and BT4) By periodically maintaining the frames in the sections AT2 and AT5, even if the sensing total time required Tsr is considerably long, it is possible to easily and easily perform a screen abnormal phenomenon that has occurred by sensing every blank time interval . Thus, the processing load of the timing controller 140 and the like for controlling the sensing timing can be reduced.

12 is a diagram illustrating an aperiodic sensing method in the display device 100 according to the present embodiments.

Referring to FIG. 12, the display device 100 according to the present embodiment is configured to detect a sub-pixel characteristic value (threshold voltage and mobility of a driving transistor) based on an image change amount between frames, And real-time sensing (RTS) can be performed in the interval BT3.

Referring to FIG. 12, in each specific active time interval AT4 following each specific blank time interval BT3 corresponding to the sensing interval, the display device 100 according to the present exemplary embodiment displays the previous active time interval (I)) already displayed in the previous active time interval AT3 without driving the subsequent frame (i + 1) of the frame (i) Keep it.

That is, the specific active time interval AT4 following the specific blank time interval BT3 selected as the sensing interval is set to be the same as that of the next blank frame interval BT3 in order to sufficiently secure the sensing time in the specific blank time interval BT3 selected as the sensing interval. (i + 1)), and keeps the frame Fraem (i) displayed in the previous active period AT3 as it is.

Referring to FIG. 12, the active period AT4 corresponds to a frame holding period, and the active periods AT1, AT2, AT3, AT5, and AT6 correspond to a frame driving period for driving a new frame.

The display apparatus 100 according to the present embodiment is configured such that when there is no or small amount of image change between the frame i and the subsequent frame i + 1 driven and displayed during the active time interval AT3, (RTS) at the selected blank time interval BT3 as the sensing period, and thereafter, during the active time interval AT4, the frame (i) is displayed during the active time interval AT3 i can be held (held) as it is.

According to this, when it is judged that there is a possibility that the image quality degradation due to the frame maintenance is likely to occur based on the image change amount, the real-time sensing is not carried out and the subsequent frame is not renewed.

Conversely, based on the amount of image change, only when it is judged that there is little or no possibility of image quality deterioration due to frame retention, real-time sensing is performed and the previous frame is maintained.

As described above, only when it is judged that the image quality deterioration due to the frame retention for ensuring the sensing time does not occur or the possibility of the image quality deterioration occurs, based on the image change amount, real time sensing is performed and the previous frame is maintained, And real-time sensing can be performed while preventing image quality deterioration. Accordingly, by compensating for the deviation of the sub-pixel characteristic values without side effects due to real-time sensing, it is possible to prevent luminance unevenness due to the deviation of the sub-pixel characteristic values, thereby improving the image quality.

On the other hand, referring to FIG. 12, the frame (i) must be displayed on the screen for a long time over two times longer than other frames. That is, due to the frame retention period, the frame time becomes longer.

Thus, referring to FIGS. 2 and 3, in each sub-pixel, the storage capacitor Cstg must be able to sustain the charged voltage for a longer time (frame time).

To this end, the off-current characteristics of the transistors, i.e., the characteristics that prevent current from flowing when the transistor is off should be good. Particularly, during the frame holding period, the off current characteristic of the switching transistor SWT, which can be a discharging path of the storage capacitor Cstg, should be good.

Therefore, in the display device 100 according to the present embodiments, the transistors TRT, SWT, and SENT in each sub-pixel, in particular, the switching transistor SWT, And may be implemented with a transistor (oxide TFT).

This can help the previous frame to be well maintained (hold) during the frame retention period to improve the screen quality.

13 is a diagram showing an example of an aperiodic sensing method in the display device 100 according to the present embodiments.

Referring to FIG. 13, the display device 100 can proceed to aperiodic sensing as follows.

The timing controller 140 calculates the amount of image change between frames (S1310).

The timing controller 140 determines whether the calculated amount of image change is below the motion threshold (S1320).

The timing controller 140 may control the source driver 120 and the scan driver 130 so that the next frame is newly driven when the calculated amount of image change is not less than the motion threshold.

If it is determined that the calculated amount of image change is less than or equal to the motion threshold, the timing controller 140 determines whether the current time is the timing at which the image can be sensed (S1330).

The timing controller 140 can control the source driver 120 and the scan driver 130 so that the subsequent frame is newly driven without sensing progression when it is determined that the current time is not the timing at which the sensing is possible (S1350) .

The timing controller 140 selects the blank time period at the current time as the sensing period and determines that the source driver 120, the scan driver 130, (SAM, SPRE), and controls the previous frame to be maintained (1340) while the real-time sensing is completed or the real-time sensing is proceeding.

As described above, even if the amount of image change is judged to be below the motion threshold in step S1320, the reason why the determination of the sensing possible timing is performed one more time without immediately proceeding to the real-time sensing is that the real- , Real-time sensing may proceed too frequently.

Here, too frequent real-time sensing may result in a sub-pixel property value that is hardly changed, and therefore, the compensation value may also vary little. Therefore, too frequent real-time sensing may not help improve image quality due to compensation.

In FIG. 13, it is shown that the sensing process (S1310, S1320) based on the image change amount is performed in advance of the sensing process (S1330) according to the sensing possible timing. However, If it is determined that the timing is sensible timing, the process of determining whether or not to perform the sensing (S1330 and S1320) may be performed based on the amount of image change.

Hereinafter, the timing controller 140 that provides the aperiodic sensing method described with reference to FIG. 13 will be described in more detail with reference to FIGS. 14 and 15. FIG.

14 is a block diagram of the timing controller 140 of the display apparatus 100 according to the present embodiments. 15 is a timing chart for the output signals of the internal configurations of the timing controller 140 of the display device 100 according to the present embodiments. However, the following description refers to the non-periodic sensing example of FIG. 12.

Referring to Fig. 14, as described above with reference to Fig. 12, the timing controller 140 sets the video data of the frame (i) and the video data of the following frame (i + 1) in the previous active period AT3 The specific blank time interval BT3 following the previous active interval AT3 is selected as the sensing interval and the specific active time interval AT4 following the specific blank time interval BT3 is selected based on the image change amount calculated on the basis of the predetermined blank time interval BT3, As a "frame maintenance interval" for securing the sensing time.

As described above, in the active time interval AT4 following the blank time interval BT3 selected as the sensing interval, the previous frame i is maintained without driving the subsequent frame i + 1, It is possible to prevent a screen abnormal phenomenon such as a line (subpixel row) to be sensed even if the sensing progressed in the blank time interval BT3 is prolonged.

Referring to FIG. 14, the timing controller 140 includes an image detector 1410, a timer 1420, a sensing request unit 1430, a sensing interval selector 1440, and the like.

The image detector 1410 detects whether the image change amount calculated based on the image data of the frame i and the image data of the next frame i + 1 in the previous active period AT3 is equal to or smaller than the motion threshold THm And outputs a detection result signal SD.

This image detector 1410 can calculate the amount of image change by calculating the difference between the image data of all the subpixels for the frame i and the image data of all the subpixels for the subsequent frame (i + 1).

In order to reduce the calculation amount, the image detector 1410 calculates the difference between the representative image data of the representative blocks for the frame i and the image data of the representative blocks for the subsequent frame (i + 1) .

Here, the representative block means a set of a plurality of subpixels. (B1, B1, B2, B2, B2, B2, 3, B3, 1, B3,2) and (B3,3)) may be an average value of the image data of the plurality of subpixels included in the representative block.

The timer 1420 controls the count signal ST indicating whether or not the timing is available for sensing.

The sensing request unit 1430 outputs a sensing request signal REQ according to the detection result signal SD output from the image detector 1410 and the count signal ST controlled by the timer 1420. [

15, the sensing request unit 1430 outputs the detection result signal SD output from the image detector 1410 and the count signal ST controlled by the timer 1420 to the input signal &lt; RTI ID = 0.0 &gt; And an AND gate logic circuit for performing AND operation on the input signal and outputting the result as a sensing request signal REQ.

The sensing period selector 1440 selects a specific blank time interval BT3 following the previous active period AT3 as a sensing period according to the sensing request signal REQ output from the sensing request unit 1430, The specific active time interval AT4 following the specific blank time interval BT3 can be selected as the frame holding interval for securing the sensing time.

The sensing request signal REQ output from the sensing request unit 1430 may be input to the sensing period selector 1440 and may be input to the delay 1460.

The delay unit 1460 may output a reset signal to the timer 1420 so that the timer 1420 can reset the count signal ST when receiving the sensing request signal REQ.

15, when a sensing request signal REQ corresponding to a sensing enable value (for example, 1) is output from the sensing request unit 1430, the timer 1420 counts the count signal ST Reset to a timing value that can not be sensed (for example, 0) from a possible timing value (for example, 1).

The timer 1420 maintains the count signal ST reset to a non-sensing timing value (e.g., 0) for a predetermined period of time.

While the count signal ST is at the non-sensing timing value (e.g., 0), the detection result signal SD output from the image detector 1410 is a signal corresponding to a case where the image change amount is equal to or less than the motion threshold value THm 1), the sensing request signal REQ corresponding to the end operation result in the sensing request unit 1430 is output as a sensing disable value (e.g., 0).

Accordingly, the sensing period selector 1440 does not select the sensing period, thereby preventing real-time sensing from proceeding.

That is, when the time is not long after the real-time sensing progresses, the count signal ST of the timer 1420 is output as a non-sensing timing value (for example, 0), thereby preventing unnecessary frequent sensing have.

The use of the timing controller 140 as described above makes it possible to detect a situation in which sensing is not necessary, that is, a situation in which a certain period of time has elapsed since the sensing was performed (sensing timing) and a situation (Sensing time + recovery time) is prolonged, it is possible to prevent the screen abnormal phenomenon and to allow accurate sensing of the characteristic value of the subpixel . Accordingly, accurate sensing data on the characteristic value of the subpixel can be obtained, and compensation for the characteristic value deviation can be properly performed.

14, the timing controller 140 selects at least one specific blank time interval BT3 as a sensing interval by the sensing interval selector 1440, and then, after a specific blank time interval BT3, When the specific active time interval AT4 is selected as the frame retention interval, the interval selection unit 1440 receives the interval selection information from the sensing interval selection unit 1440 and receives at least one The scan signal is supplied to at least one of the gate lines of the first active time interval AT3 and the next active time interval AT4 following the specific blank time interval BT3 so that the displayed frame i is maintained in the previous active time interval AT3 The source driver 120, the scan driver 130, and the like.

Referring to FIG. 15, the operation of the internal configurations of the timing controller 140 will be described in more detail.

The image detector 1410 outputs a detection result signal SD corresponding to the first detection value (e.g., 1) when the image change amount is equal to or less than the motion threshold value THm. When the image change amount exceeds the motion threshold value, And outputs a detection result signal SD corresponding to the second detection value (e.g., 0).

The timer 1420 receives the reset signal from the delay unit 1460 and outputs the count signal ST when the sensing request signal REQ output from the sensing request unit 1430 is a sensing enable value (For example, 0) to a non-sensing timing value (for example, 0) from a sensible timing value (e.g., 1) and holds it for a predetermined time Tst.

The timer 1420 changes the count signal ST from a non-sensing timing value (e.g., 0) to a sensible timing value (e.g., 1) when the predetermined time Tst expires and outputs the sensing request signal REQ as sensing And is held as an enable value (e.g., 1) until a reset signal is input.

The sensing request unit 1430 outputs the sensing request signal REQ when the detection result signal SD is the first detection value (e.g., 1) and the count signal ST is the sensible timing value (e.g., 1) And outputs it as a sensing enable value (e.g., 1).

The sensing request unit 1430 may be configured to determine whether the detection result signal SD is a first detection value (e.g., 1) and the count signal ST is a sensible timing value (e.g., 1) And outputs the request signal REQ as a sensing disable value (e.g., 0).

If the sensing request signal REQ is a sensing enable value (for example, 1), the sensing interval selector 1440 selects a specific blank time interval BT3 following the previous active interval AT3 as a sensing interval , The specific active time interval AT4 following the specific blank time interval BT3 is selected as the frame holding interval for securing the sensing time.

The internal configuration of the timing controller 140 operates in accordance with the signal timing as described above, so that more accurate sensing control can be performed.

Hereinafter, the driving method of the above-described display apparatus 100 will be briefly described again.

16 is a flowchart of a method of driving the display device 100 according to the present embodiments.

16, the method for driving the display device 100 according to the present embodiment is characterized in that the display device 100 sequentially drives a plurality of gate lines during a first active time period to display a first frame (S1610), and the display device 100 drives at least one gate line of the plurality of gate lines to sense at least one sub-pixel during a first blank time interval following the first active time interval (Step S1630), and the display device 100 maintains the first frame displayed during the first active time interval for securing the sensing time during the second active time interval following the first blank time interval (S1640 ), And the like.

The scan signal supplied to at least one gate line in the first blank time interval may be maintained after the start point of the second active time interval.

According to the above description, in the second active time interval subsequent to the first blank time interval in which sensing is performed, the first frame displayed previously is held (held) without performing a new subsequent frame driving so that the sensing total travel time Tsr Is longer than the first blank time interval, real-time sensing can be efficiently provided without causing a problem such as a screen abnormal phenomenon.

Referring to FIG. 16, the driving method of the display device 100 according to the present exemplary embodiment includes a step (S1620) in which the display device 100 selects the first blank time period as the sensing period after the step S1610 .

16, the step S1620 is performed after the step S1610, but this is only an example for convenience of description, and the step S1620 may be performed before the step S1610. That is, after the amount of image change between various frames is calculated in advance and the sensing period is set in advance, the frame driving may be started.

As described above, the number of times of real-time sensing can be reduced by performing the sensing only during the first blank time period selected as the sensing period without sensing every blank time interval.

According to the above description, in the second active time interval following the first blank time interval in which sensing is performed, the first frame displayed previously is held (held) without performing a new subsequent frame driving. If the image change is severe, the image quality may deteriorate rather.

Therefore, in the above-described step S1620, the display apparatus 100 can select the first blank time period as the sensing period based on the amount of change in the image between the first frame and the subsequent frame. Here, the fact that the sensing period is selected may be the same meaning that the real-time sensing proceeds.

According to this, when the amount of image change between the first frame and the subsequent frame is equal to or smaller than the motion threshold, the display device 100 determines to perform real-time sensing and selects the first blank time interval as the sensing interval.

Alternatively, when the amount of image change between the first frame and the succeeding frame is not less than the motion threshold, the display apparatus 100 determines not to perform the real-time sensing, selects the first blank time period as the sensing period, In the second active time interval, the driving for the subsequent frame of the first frame is proceeded.

Therefore, the display apparatus 100 determines that the image change amount between the first frame and the succeeding frame is below the motion threshold, does not drive the subsequent frame, and does not cause a screen abnormal phenomenon even if the first frame is maintained Only real-time sensing followed by frame maintenance can be performed without side effects such as deterioration of image quality.

Meanwhile, in the above-described step S1620, when the image change amount between the first frame and the subsequent frame is equal to or smaller than the motion threshold and the time from the previous sensing period to the present time is longer than a predetermined time That is, when the current time is the sensing possible timing), the first blank time period may be selected as the sensing period so that the real time sensing proceeds.

As a result, it is possible to prevent the sensing from proceeding unnecessarily frequently without meaning.

According to the embodiments as described above, it is possible to provide the display device 100 and the driving method thereof so as not to cause problems such as sensing operation and screen driving even if a long time is required for sensing.

According to the embodiments, it is possible to provide the display device 100 and the driving method thereof, which can prevent the screen drive from being affected by the sensing and cause the screen abnormal phenomenon.

According to the embodiments, it is possible to provide the display device 100 and the driving method thereof that can prevent unnecessary and meaningless sensing.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. , Separation, substitution, and alteration of the invention will be apparent to those skilled in the art. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the present invention should be construed as being included in the scope of the present invention.

100: display device
110: Display panel
120: Source driver
130: scan driver
140: Timing controller

Claims (13)

A display panel in which a plurality of data lines and a plurality of gate lines are arranged and a plurality of subpixels are arranged in a matrix type;
A source driver for driving the plurality of data lines;
A scan driver for driving the plurality of gate lines; And
And a timing controller for outputting a control signal for controlling an operation timing of the source driver and the scan driver,
A scan signal is supplied to at least one gate line of the plurality of gate lines during at least one specific blank time interval on the vertical synchronization signal,
Wherein a frame displayed in a previous active time interval is maintained in a specific active time interval subsequent to the specific blank time interval. The method according to claim 1,
Wherein a scan signal supplied to the at least one gate line during the specific blank time interval is maintained after a start point of the specific active time interval. The method according to claim 1,
Wherein the data voltage for sensing driving is supplied to at least one subpixel among the subpixels supplied with a scan signal from the at least one gate line during the specific blank time period. The method according to claim 1,
The specific blank time period is a blank time period selected as a sensing period for sensing a subpixel characteristic value according to a preset sensing period,
Wherein the specific active time interval following the specific blank time interval is selected as a frame holding interval for securing a sensing time. The method according to claim 1,
The specific blank time interval is a blank time interval selected as a sensing interval for sensing a subpixel characteristic value based on an image change amount between frames,
Wherein the specific active time interval following the specific blank time interval is an active time interval selected as a frame holding interval for securing a sensing time. 6. The method of claim 5,
The timing controller includes:
Based on the image change amount calculated based on the image data of the frame displayed in the previous active period and the image data of the subsequent frame,
Selecting the specific blank time interval following the previous active interval as the sensing interval,
And selects the specific active time interval following the specific blank time interval as the frame holding interval for securing the sensing time. The method according to claim 6,
The timing controller includes:
An image detector for detecting whether the image change amount calculated based on the image data of the frame displayed in the previous active period and the image data of the subsequent frame is below a motion threshold value and outputting a detection result signal;
A timer for controlling a count signal indicating whether or not the timing is sensible;
A sensing request unit for outputting a sensing request signal according to the detection result signal and the count signal; And
Wherein the control unit selects the specific blank time interval following the previous active interval as the sensing interval according to the sensing request signal and controls the specific active time interval subsequent to the specific blank time interval to the frame holding interval And a sensing period selector for selecting the sensing period. 8. The method of claim 7,
Wherein the image detector comprises:
And outputs the detection result signal corresponding to the first detection value when the image change amount is less than or equal to the motion threshold value and outputs the detection result signal corresponding to the second detection value when the image change amount exceeds the motion threshold value In addition,
The timer includes:
Wherein when the sensing request signal output from the sensing request unit is a sensing enable value, the count signal is reset to a sensing impossible timing value from a sensible timing value and maintained for a predetermined time, and when the predetermined time has elapsed, From a non-sensing timing value to a sensing possible timing value, holds the sensing request signal until the sensing request signal is output as a sensing enabling value,
The sensing request unit,
And outputting the sensing request signal as a sensing enable value when the detection result signal is a first detection value and the count signal is a sensible timing value,
The sensing period selector may select,
When the sensing request signal is a sensing enable value, selecting the specific blank time interval following the previous active interval as the sensing interval, and selecting the specific active time interval following the specific blank time interval as the sensing time As the frame holding period. The method according to claim 1,
Each of the plurality of sub-
Organic light emitting diodes;
A driving transistor for driving the organic light emitting diode;
A switching transistor electrically connected between the gate node of the driving transistor and the data line; And
And a storage capacitor electrically connected between a gate node of the driving transistor and a source node or a drain node of the driving transistor,
Wherein the switching transistor is an oxide thin film transistor (Oxide TFT). A display panel in which a plurality of data lines and a plurality of gate lines are arranged and a plurality of subpixels are arranged in a matrix type, a source driver for driving the plurality of data lines, and a scan driver for driving the plurality of gate lines A method of driving a display device,
Sequentially driving the plurality of gate lines to display a first frame during a first active time interval;
Sensing at least one subpixel by driving at least one gate line of the plurality of gate lines during a first blank time interval subsequent to the first active time interval; And
And maintaining the first frame displayed during the first active time interval for securing a sensing time during a second active time interval subsequent to the first blank time interval. 11. The method of claim 10,
Before or after displaying the first frame,
And selecting the first blank time period as a sensing period. 12. The method of claim 11,
Wherein the selecting comprises:
And selecting the first blank time interval as a sensing interval based on an image change amount between the first frame and a subsequent frame. 13. The method of claim 12,
Wherein the selecting comprises:
A driving method of a display device for selecting the first blank time interval as a sensing interval when the amount of image change between the first frame and the following frame is below a motion threshold and the time from the previous sensing interval to the present time is longer than a predetermined time .

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