KR20170118992A - Controller, organic light emitting display device, and the method for driving the organic light emitting display device - Google Patents

Abstract

The present embodiments are directed to an OLED display panel in which an organic light emitting diode, a transistor, and a capacitor are arranged for each subpixel, a data driver for driving a plurality of data lines, a gate driver for driving a plurality of gate lines, The method comprising the steps of: selectively sensing a voltage of a sensing line electrically connected to a sensing node of each sub-pixel when the predetermined sensing condition is satisfied; and a controller for controlling selective sensing .
According to these embodiments, it is possible to prevent unnecessary and meaningless sensing process from proceeding, thereby preventing deterioration and shortening of life span of the transistor driven according to the sensing drive.

Description

TECHNICAL FIELD [0001] The present invention relates to a controller, an organic light emitting display, and a method of driving the same. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light emitting diode (OLED)

The present embodiments relate to a controller, an organic light emitting display, and a driving method thereof.

2. Description of the Related Art In recent years, an organic light emitting diode (OLED) display device that has been popular as a display device has advantages of high response speed, high luminous efficiency, high brightness, and wide viewing angle by using an organic light emitting diode (OLED)

Such an organic light emitting display device arranges subpixels including organic light emitting diodes in a matrix form and controls the brightness of subpixels selected by the scan signals according to the gradation of data.

Each of the sub-pixels of the organic light emitting display may include an organic light emitting diode and a transistor necessary for driving the organic light emitting diode.

On the other hand, circuit elements such as transistors and organic light emitting diodes in each sub-pixel have unique characteristic values. For example, the transistor has a characteristic value such as a threshold voltage and a mobility, and the organic light emitting diode has a characteristic value such as a threshold voltage.

The circuit elements such as transistors and organic light emitting diodes in each sub-pixel may undergo degradation according to driving time, and unique characteristic values such as threshold voltage and mobility may be changed.

Because of these points, there is a difference in degree of deterioration between circuit elements depending on the difference in driving time between the circuit elements in each sub-pixel, and a characteristic value deviation between the circuit elements may also occur.

Such a characteristic value deviation (characteristic value deviation of the subpixel) between the circuit elements may cause a luminance deviation between each subpixel, which may be a main factor causing image quality degradation.

Accordingly, various techniques have been developed to compensate for the deviation of the characteristic values of the subpixels.

However, according to sensing driving for compensating a characteristic value deviation of a subpixel, the image driving operation, which is an essential function of the organic light emitting display, may be delayed.

In addition, sensing and compensating operations are performed at predetermined timings while determining the timing at which the sensing and compensating operations are performed, and there is a problem that sensing and compensating operations can be performed unnecessarily frequently even though a meaningful sensing value and compensation value can not be obtained have.

In addition, deterioration of the transistor driven according to the sensing drive for compensating the characteristic value deviation of the subpixel may be unnecessarily generated, and the lifetime of the transistor may also be shortened.

An object of the present embodiments is to provide a controller, an organic light emitting display, and a method of driving the same, which can selectively proceed without sensing process of sensing a characteristic value or a change of a sub pixel every time a power on signal is generated There is.

Another object of the present invention is to provide a controller, an organic light emitting display, and a driving method thereof that can prevent an unnecessary and meaningless sensing process from occurring every time a power-on signal is generated.

It is another object of the present invention to provide a controller, an organic light emitting display, and an organic light emitting diode display capable of adaptive sensing control capable of preventing deterioration and shortening of lifetime of a transistor driven according to a sensing drive for compensating for a characteristic- And a driving method thereof.

In one aspect, the present embodiments can provide an organic light emitting display device capable of selectively proceeding without going through a sensing process of sensing a characteristic value or a change of a sub pixel every time a power-on signal is generated.

In the organic light emitting display, a plurality of data lines and a plurality of gate lines are arranged, a plurality of subpixels defined by a plurality of data lines and a plurality of gate lines are arranged, and each subpixel has an organic light emitting diode, A driving transistor having a first node to which a data voltage is applied, a second node to which a first electrode of the organic light emitting diode and a third node to which a driving voltage are applied, And a storage capacitor connected between a first node and a second node of the driving transistor is disposed on the organic light emitting display panel.

The OLED display may include a sensing unit sensing a voltage of a sensing line electrically connected to a sensing node of each sub-pixel only when a predetermined sensing condition is satisfied when a power-on signal is generated.

In another aspect, the present embodiments can provide a method of driving an organic light emitting display device that allows selective progression without progressing a sensing process of sensing a characteristic value or a change of a sub pixel every time a power-on signal is generated have.

Such a driving method may include a step of determining whether or not a predetermined sensing condition is satisfied in accordance with generation of the power-on signal.

In addition, the driving method may include a step of, when it is determined that the sensing condition is satisfied, a sensing process for sensing a characteristic value or a characteristic value change of the driving transistor.

In addition, the driving method may include displaying the image on the organic light emitting display panel when the sensing process is completed.

According to another aspect of the present invention, it is possible to provide a controller capable of selectively proceeding a sensing process by determining whether a sensing process for sensing a characteristic value or a change of a subpixel is performed each time a power-on signal is generated.

The controller may include a determination unit that determines whether the sensing condition is satisfied at the present time according to the generation of the power-on signal.

In addition, when the sensing condition is satisfied, the controller controls the sensing process for sensing the characteristic value or characteristic value change of the driving transistor in each sub-pixel to proceed. If the sensing condition is not satisfied, And a controller for controlling the image driving for displaying an image on the panel to proceed.

In another aspect, it is possible to provide a controller that enables selective progression of a sensing process according to a control signal indicating whether a sensing process for sensing a characteristic value or a change thereof for each subpixel occurs each time a power-on signal is generated .

Such a controller may include a signal input unit for receiving a sensing enable signal when a power-on signal is generated.

When the sensing enable signal is inputted, the controller controls the sensing process to sense the characteristic value or characteristic value change of the driving transistor in each sub-pixel. When the sensing enable signal is not inputted, And a controller for controlling the image driving to display an image on the organic light emitting display panel.

According to embodiments of the present invention described above, it is possible to provide a controller, an organic light emitting display, and a display device capable of selectively proceeding without a sensing process of sensing a characteristic value or a change of a subpixel every time a power- A driving method can be provided.

According to the present embodiments, it is possible to provide a controller, an organic light emitting display, and a driving method thereof that can prevent an unnecessary and meaningless sensing process from occurring every time a power-on signal is generated.

According to the embodiments of the present invention, it is possible to provide a controller, an organic light emitting display device, and a driving method thereof that enable adaptive sensing control that can prevent deterioration and shortening of life time of a transistor driven according to sensing drive for compensating for a characteristic- Method can be provided.

1 is a schematic system configuration diagram of an organic light emitting display according to the present embodiments.
FIG. 2 is a view illustrating a sub-pixel structure of an OLED display according to an embodiment of the present invention. Referring to FIG.
3 is a view illustrating another example of the sub-pixel structure of the OLED display according to the present embodiments.
4 is an illustration of a compensation circuit of an organic light emitting diode display according to the present embodiments.
5 is a view for explaining a threshold voltage sensing driving method for a driving transistor of an organic light emitting display according to the present embodiments.
6 is a view for explaining a mobility sensing driving method for a driving transistor of an organic light emitting diode display according to embodiments of the present invention.
7 is an exemplary view of sensing timing of the OLED display according to the present embodiments.
8 is a view for explaining the deterioration of the second transistor and the shortening of the lifetime of the organic light emitting display according to the embodiments of the present invention.
9 is a diagram illustrating an adaptive sensing system of an OLED display according to the present embodiments.
10 and 11 are views showing a first adaptive sensing method of the OLED display according to the present embodiments.
12 and 13 are views showing a second adaptive sensing method of the OLED display according to the present embodiments.
FIG. 14 is a view illustrating an embodiment of an organic light emitting display according to the present embodiments.
15 is a flowchart illustrating a method of driving the organic light emitting display according to the present embodiments.
16 is a flowchart illustrating a sensing step in a method of driving an organic light emitting display according to the present embodiments.
17 is a block diagram showing a controller of an OLED display according to the present embodiments.
18 is another block diagram showing the controller of the OLED display 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.

FIG. 1 is a schematic system configuration diagram of an organic light emitting diode display 100 according to the present embodiments.

1, the OLED display 100 according to the present embodiment includes a plurality of data lines DL and a plurality of gate lines GL, a plurality of data lines DL, An OLED display panel 110 in which a plurality of sub pixels (SP) defined by a gate line GL are arranged, a data driver 120 driving a plurality of data lines DL, A gate driver 130 for driving the gate line GL, a controller 140 for controlling the data driver 120 and the gate driver 130, and the like.

The controller 140 supplies various control signals to the data driver 120 and the gate driver 130 to control the data driver 120 and the gate driver 130.

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

The controller 140 may be a timing controller used in a conventional display technology or a control device including a timing controller to perform other control functions.

The controller 140 may be implemented as a separate component from the data driver 120, or may be implemented as an integrated circuit together with the data driver 120.

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

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

Each source driver integrated circuit (SDIC) may include a shift register, a latch circuit, a digital to analog converter (DAC), an output buffer, and the like.

Each source driver integrated circuit (SDIC) may further include an analog to digital converter (ADC), as the case may be.

The gate driver 130 sequentially supplies the scan signals to the plurality of gate lines GL to sequentially drive the plurality of gate lines GL. Here, the gate driver 130 is also referred to as a " scan driver ".

The gate driver 130 may include at least one gate driver integrated circuit (GDIC).

Each gate driver IC (GDIC) may include a shift register, a level shifter, and the like.

The gate driver 130 sequentially supplies a scan signal of an On voltage or an Off voltage to the plurality of gate lines GL under the control of the controller 140.

When a specific gate line is opened by the gate driver 130, the data driver 120 converts the image data received from the controller 140 into an analog data voltage and supplies the data voltage to a plurality of data lines DL.

1, the data driver 120 may be located only on one side (for example, on the upper side or the lower side) of the organic light emitting display panel 110, and in some cases, depending on the driving method, And may be located on both sides (e.g., upper and lower sides) of the display panel 110.

1, the gate driver 130 may be located only on one side (e.g., the left side or the right side) of the organic light emitting display panel 110, and depending on the driving method, the panel design method, And may be located on both sides (e.g., left and right sides) of the light emitting display panel 110.

The controller 140 described above is capable of outputting various kinds of signals including the vertical synchronization signal Vsync, the horizontal synchronization signal Hsync, the input data enable signal (DE), and the clock signal (CLK) Timing signals from the outside (e.g., the host system).

The controller 140 receives a timing signal such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, an input DE signal, and a clock signal to control the data driver 120 and the gate driver 130, And generates various control signals and outputs them to the data driver 120 and the gate driver 130.

For example, in order to control the gate driver 130, the 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 gate driver integrated circuits constituting the gate driver 130. The gate shift clock GSC is a clock signal commonly input to one or more gate 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 gate driver ICs.

In order to control the data driver 120, the controller 140 may further include a source start pulse (SSP), a source sampling clock (SSC), a source output enable signal (SOE) And outputs various data control signals (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 data 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 data driver 120.

Each subpixel SP arranged in the organic light emitting display panel 110 includes an organic light emitting diode (OLED), a driving transistor for driving the organic light emitting diode (OLED) And the like.

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

2 is an exemplary view of a sub-pixel structure of the OLED display 100 according to the present embodiments.

Referring to FIG. 2, in the organic light emitting diode display 100 according to the present embodiment, each of the sub-pixels SP basically includes an organic light emitting diode OLED, a driving circuit for driving the organic light emitting diode OLED A first transistor T1 for transmitting a data voltage to a first node N1 corresponding to a gate node of a driving transistor DRT and a driving transistor DRT; And a storage capacitor (Cst: Storage Capacitor) for maintaining the voltage corresponding thereto for one frame time.

The organic light emitting diode OLED may include 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).

A base voltage EVSS may be applied to the second electrode of the organic light emitting diode OLED.

The driving transistor DRT drives the organic light emitting diode OLED by supplying a driving current to the organic light emitting diode OLED.

The driving transistor DRT has a first node N1, a second node N2, and a third node N3.

The first node N1 of the driving transistor DRT is a node corresponding to a gate node and may be electrically connected to a source node or a drain node of the first transistor T1.

The second node N2 of the driving transistor DRT may be electrically connected to the first electrode of the organic light emitting diode OLED and may be a source node or a drain node.

The third node N3 of the driving transistor DRT may be electrically connected to a driving voltage line DVL that supplies a driving voltage EVDD as a node to which the driving voltage EVDD is applied, Node or source node.

The driving transistor DRT and the first transistor T1 may be implemented as an n-type or a p-type as illustrated in FIG.

The first transistor T1 is electrically connected between the data line DL and the first node N1 of the driving transistor DRT and receives the scan signal SCAN through the gate line have.

The first transistor T1 may be turned on by the scan signal SCAN to transfer the data voltage Vdata supplied from the data line DL to the first node N1 of the driving transistor DRT .

The storage capacitor Cst may be electrically connected between the first node N1 and the second node N2 of the driving transistor DRT.

The storage capacitor Cst is not a parasitic capacitor (for example, Cgs or Cgd) which is an internal capacitor existing between the first node N1 and the second node N2 of the driving transistor DRT, And is an external capacitor intentionally designed outside the driving transistor DRT.

In the OLED display 100 according to the present embodiment, as the driving time of each sub-pixel SP becomes longer, the driving voltage of the organic light emitting diode OLED, the driving transistor DRT, Degradation can proceed.

Accordingly, inherent characteristic values of the circuit elements such as the organic light emitting diode (OLED) and the driving transistor (DRT) can be changed. Here, the intrinsic property value of the circuit element may include a threshold voltage of the organic light emitting diode OLED, a threshold voltage of the driving transistor DRT, a mobility of the driving transistor DRT, and the like.

A change in the characteristic value of the circuit element may cause a change in luminance of the corresponding subpixel. Therefore, the change in the characteristic value of the circuit element can be used in the same concept as the change in luminance of the subpixel.

In addition, the degree of change in the characteristic value between the circuit elements may be different depending on the degree of deterioration of each circuit element.

Such a difference in degree of characteristic value change between circuit elements may cause a deviation in characteristic value between circuit elements, resulting in luminance deviation between subpixels. Therefore, the characteristic value deviation between the circuit elements can be used in the same concept as the luminance deviation between the subpixels.

Variations in the characteristic values of the circuit elements (luminance variation of the subpixels) and characteristic deviations between the circuit elements (luminance deviation between the subpixels) cause problems such as degradation of the accuracy of luminance expressions of subpixels or occurrence of screen anomalies .

The organic light emitting diode display 100 according to the exemplary embodiments of the present invention can provide a sensing function for sensing a characteristic value for a subpixel and a compensation function for compensating a subpixel characteristic value using a sensing result.

Sensing a characteristic value for a subpixel in this specification means sensing a characteristic value or a characteristic value change of a circuit element (a driving transistor DRT, an organic light emitting diode (OLED)) in a subpixel, DRT), and organic light emitting diode (OLED)).

In this specification, the compensation of the characteristic value for the subpixel means that the characteristic value or the characteristic value change of the circuit element (drive transistor DRT, organic light emitting diode (OLED)) in the subpixel is changed to a predetermined level, The transistor DRT, and the organic light emitting diode OLED) may be reduced or eliminated.

The organic light emitting diode display 100 according to the present embodiments may include a compensation circuit including a sensing and compensation structure and a subpixel structure suitable for providing a sensing function and a compensation function.

3 is another example of the sub-pixel structure of the OLED display 100 according to the present embodiments.

The subpixel structure shown in FIG. 3 is an example of a suitable subpixel structure to provide a sensing function and a compensation function.

Referring to FIG. 3, each sub-pixel disposed in the organic light emitting display panel 110 according to the present exemplary embodiment includes an organic light emitting diode OLED, a driving transistor DRT, a first transistor T1, In addition to the storage capacitor Cst, it may further include a second transistor T2.

3, the second transistor T2 is electrically connected between the second node N2 of the driving transistor DRT and a reference voltage line RVL for supplying a reference voltage Vref And may be controlled by receiving a sensing signal SENSE, which is a kind of a scan signal, to the gate node.

By further including the second transistor T2 described above, the voltage state of the second node N2 of the driving transistor DRT in the sub-pixel SP can be effectively controlled.

The second transistor T2 is turned on by the sensing signal SENSE and applies a reference voltage Vref supplied through the reference voltage line RVL to the second node N2 of the driving transistor DRT .

Also, the second transistor T2 may be utilized as one of the voltage sensing paths for the second node N2 of the driving transistor DRT.

Meanwhile, the scan signal SCAN and the sense signal SENSE may be separate gate signals. In this case, the scan signal SCAN and the sense signal SENSE may be respectively applied to the gate node of the first transistor T1 and the gate node of the second transistor T2 through different gate lines.

In some cases, the scan signal SCAN and the sense signal SENSE may be the same gate signal. In this case, the scan signal SCAN and the sense signal SENSE may be commonly applied to the gate node of the first transistor T1 and the gate node of the second transistor T2 through the same gate line.

4 is an exemplary diagram of a compensation circuit of the OLED display 100 according to the present embodiments.

Referring to FIG. 4, the OLED display 100 according to the present embodiment includes a sensing unit 410 for generating and outputting sensing data through voltage sensing in order to determine a characteristic value for a subpixel, And a compensation unit 430 that performs a compensation process for compensating the characteristic value of the subpixel based on the characteristic value of the subpixel using the sensing data.

For example, the sensing unit 410 may include at least one analog-to-digital converter (ADC).

Each analog-to-digital converter (ADC) may be contained within each source driver integrated circuit (SDIC) included in the data driver 120 and, in some cases, may be external to the source driver integrated circuit . ≪ / RTI >

The compensation unit 430 may be included inside the controller 140 and may be included outside the controller 140 in some cases.

The sensing data output from the sensing unit 410 may be, for example, a Low Voltage Differential Signaling (LVDS) data format.

Referring to FIG. 4, the OLED display 100 according to the present embodiment includes an initialization switch SPRE for controlling whether a reference voltage Vref is applied to a reference voltage line RVL, And a sampling switch (SAM) for controlling connection between the sensing unit (RVL) and the sensing unit (410).

The initialization switch SPRE is connected to the second node N2 of the driving transistor DRT so that the second node N2 of the driving transistor DRT in the sub-pixel SP becomes a voltage state reflecting the characteristic value of the desired circuit element. To the voltage application state.

When the initialization switch SPRE is turned on, the reference voltage Vref is supplied to the reference voltage line RVL and is supplied to the second node N2 of the driving transistor DRT through the second transistor T2, ). ≪ / RTI >

The sampling switch (SAM) is turned on to electrically connect the reference voltage line (RVL) and the sensing unit (410).

The sampling switch SAM is turned on so that the second node N2 of the driving transistor DRT in the subpixel SP turns on when the voltage state reflects the characteristic value of the desired circuit element Respectively.

When the sampling switch SAM is turned on, the sensing unit 410 may sense the voltage of the connected reference voltage line RVL.

When the sensing unit 410 senses the voltage of the reference voltage line RVL and the second transistor T2 is turned on and the resistance component of the driving transistor DRT can be ignored, ) May correspond to the voltage of the second node N2 of the driving transistor DRT.

The voltage sensed by the sensing unit 410 may be the voltage of the reference voltage line RVL, that is, the voltage of the second node N2 of the driving transistor DRT.

If a line capacitor is present on the reference voltage line RVL, the voltage sensed by the sensing portion 410 may be the voltage charged in the line capacitor on the reference voltage line RVL.

Here, the reference voltage line RVL is also referred to as a sensing line.

For example, the voltage sensed by the sensing unit 410 may be a voltage value (Vdata-Vth or Vdata-? Vth, where Vdata-Vth includes the threshold voltage Vth or threshold voltage deviation Vth of the driving transistor DRT) Is a data voltage for sensing driving), or a voltage value for sensing the mobility of the driving transistor DRT.

On the other hand, the reference voltage lines RVL may be arranged one for each sub-pixel column, or one for each of two or more sub-pixel columns.

For example, when one pixel is composed of four subpixels (red subpixel, white subpixel, green subpixel, and blue subpixel), the reference voltage line RVL is divided into four subpixel columns , A white subpixel column, a green subpixel column, and a blue subpixel column).

In the following, the threshold voltage sensing drive and the mobility sensing drive for the driving transistor DRT will be briefly described.

5 is a view for explaining a threshold voltage sensing driving method for the driving transistor DRT of the OLED display 100 according to the present embodiments.

The threshold voltage sensing drive for the driving transistor DRT may proceed to a sensing process including an initialization step, a tracking step and a sampling step.

The initializing step is a step of initializing the first node N1 and the second node N2 of the driving transistor DRT.

In this initialization step, the first transistor T1 and the second transistor T2 are turned on, and the initialization switch SPRE is turned on.

Thus, the first node N1 and the second node N2 of the driving transistor DRT are initialized to the threshold voltage sensing driving data voltage Vdata and the reference voltage Vref (V1 = Vdata, V2 = Vref).

The tracking step is performed until the voltage V2 of the second node N2 of the driving transistor DRT is turned on until the voltage of the second node N2 of the driving transistor DRT becomes a threshold voltage or a voltage state reflecting the change, .

That is, the tracking step is a step of tracking the voltage of the second node N2 of the driving transistor DRT which can reflect the threshold voltage or the change.

In this tracking step, the initialization switch SPRE is turned off or the second transistor T2 is turned off, and the second node N2 of the driving transistor DRT is floated.

As a result, the voltage V2 of the second node N2 of the driving transistor DRT rises.

The voltage V2 of the second node N2 of the driving transistor DRT rises and the rising width gradually decreases and becomes saturated.

The saturated voltage of the second node N2 of the driving transistor DRT may correspond to the difference between the data voltage Vdata and the threshold voltage Vth or the difference between the data voltage Vdata and the threshold voltage deviation Vth .

When the voltage V2 of the second node N2 of the driving transistor DRT becomes saturated, the sampling step can proceed.

The sampling step is a step of measuring a threshold voltage of the driving transistor DRT or a voltage reflecting the change thereof so that the sensing unit 410 can sense the voltage of the reference voltage line RVL, And sensing the voltage of the node N2.

In this sampling step, the sampling switch SAM is turned on so that the sensing unit 410 is connected to the reference voltage line RVL to supply the voltage of the reference voltage line RVL, that is, And senses the voltage V2 of the second node N2.

The voltage Vsen sensed by the sensing unit 410 is a voltage Vdata-Vth obtained by subtracting the threshold voltage Vth from the data voltage Vdata or a voltage Vdata-Vth obtained by subtracting the threshold voltage deviation Vth from the data voltage Vdata Vdata -? Vth). Here, Vth may be a positive threshold voltage or a negative threshold voltage.

6 is a diagram for explaining a mobility sensing driving method for the driving transistor DRT of the OLED display 100 according to the present embodiments.

The mobility sensing drive for the driving transistor DRT may proceed to a sensing process including an initialization step, a tracking step and a sampling step.

The initializing step is a step of initializing the first node N1 and the second node N2 of the driving transistor DRT.

In this initialization step, the first transistor T1 and the second transistor T2 are turned on, and the initialization switch SPRE is turned on.

Accordingly, the first node N1 and the second node N2 of the driving transistor DRT are initialized to the mobility sensing driving data voltage Vdata and the reference voltage Vref, respectively (V1 = Vdata, V2 = Vref).

The tracking step is performed until the voltage V2 of the second node N2 of the driving transistor DRT reaches the voltage V2 until the voltage of the second node N2 of the driving transistor DRT becomes the voltage state reflecting the mobility or the change thereof. .

That is, the tracking step is a step of tracking the voltage of the second node N2 of the driving transistor DRT which can reflect the mobility or the change.

In this tracking step, the initialization switch SPRE is turned off or the second transistor T2 is turned off, so that the second node N2 of the driving transistor DRT is floated. At this time, the first transistor T1 is turned off, and the first node N1 of the driving transistor DRT can also be floated together.

As a result, the voltage V2 of the second node N2 of the driving transistor DRT starts to rise.

The rising speed of the voltage V2 of the second node N2 of the driving transistor DRT depends on the current capability (i.e., mobility) of the driving transistor DRT.

The voltage V2 of the second node N2 of the driving transistor DRT increases more sharply as the driving transistor DRT having a higher current capability (mobility) is.

The sampling step may proceed after the tracking step has progressed for a predetermined time period DELTA t, that is, after the voltage V2 of the second node N2 of the driving transistor DRT has risen for a predetermined constant time DELTA t.

During the tracking step, the rising speed of the voltage V2 of the second node N2 of the driving transistor DRT corresponds to the voltage variation? V for a predetermined time? T.

In the sampling step, the sampling switch SAM is turned on, and the sensing unit 410 and the reference voltage line RVL are electrically connected.

Accordingly, the sensing unit 410 senses the voltage of the reference voltage line RVL, that is, the voltage V2 of the second node N2 of the driving transistor DRT.

The voltage Vsen sensed by the sensing unit 410 is a voltage increased by the voltage change amount? V for a predetermined time? T from the initialization voltage Vref and is a voltage corresponding to the mobility.

5 and 6, the sensing unit 410 may convert the sensed voltage Vsen to a digital value for threshold voltage sensing or mobility sensing, And generates and outputs sensing data including a digital value (sensing value).

The sensing data output from the sensing unit 410 may be stored in the memory 420 or may be provided to the compensating unit 430.

The compensation unit 430 may store characteristic values (e.g., threshold voltage, mobility) of the driving transistor DRT in the corresponding subpixel or driving transistor DRT in the memory 420 based on the sensing data provided in the sensing unit 410, (E.g., a change in threshold voltage and a change in mobility) of the characteristic value of the target object, and perform characteristic value compensation process.

Here, the change in the characteristic value of the driving transistor DRT means that the current sensing data is changed based on the previous sensing data, or the current sensing data is changed based on the reference sensing data.

Here, when comparing the characteristic value or the characteristic value change between the driving transistors DRT, it is possible to grasp the characteristic value deviation between the driving transistors DRT. When the characteristic value change of the driving transistor DRT means that the current sensing data is changed based on the reference sensing data, the characteristic value deviation (i.e., the sub pixel luminance deviation) between the driving transistors DRT from the characteristic value change of the driving transistor DRT, .

The characteristic value compensation process may include a threshold voltage compensation process for compensating the threshold voltage of the driving transistor DRT and a mobility compensation process for compensating the mobility of the driving transistor DRT.

The threshold voltage compensation process calculates a compensation value for compensating a threshold voltage or a threshold voltage deviation (threshold voltage change), stores the calculated compensation value in the memory 420, or stores the corresponding video data Data as a calculated compensation value. For example.

The mobility compensation process calculates a compensation value to compensate for mobility or mobility deviation (mobility change), stores the calculated compensation value in the memory 420, or stores the corresponding image data Data as the calculated compensation value, For example.

The compensation unit 430 may change the image data Data through the threshold voltage compensation process or the mobility compensation process and supply the changed data to the corresponding source driver integrated circuit (SDIC) in the data driver 120.

Accordingly, the source driver integrated circuit (SDIC) converts the data changed by the compensating unit 430 into a data voltage through a digital-to-analog converter (DAC) and supplies the data voltage to the corresponding subpixel, Compensation (threshold voltage compensation, mobility compensation) is actually performed.

By compensating for the subpixel characteristic value, luminance deviation between the subpixels is reduced or prevented, thereby improving the image quality.

FIG. 7 is a diagram illustrating the sensing timing of the OLED display 100 according to the present embodiments.

Referring to FIG. 7, the organic light emitting display 100 according to the present embodiment includes:

When a power-on signal is generated, the characteristic value of the driving transistor DRT in each sub-pixel disposed in the organic light emitting display panel 110 can be sensed. This sensing process is referred to as an " on-sensing process ".

When a power-off signal is generated, the characteristic value of the driving transistor DRT in each sub-pixel disposed in the organic light emitting display panel 110 is sensed before an off-sequence such as power-off occurs It is possible. This sensing process is referred to as an " off-sensing process ".

In addition, after the power-on signal is generated, the characteristic value of the driving transistor DRT in each sub-pixel disposed in the organic light emitting display panel 110 may be sensed at every blank time during the display driving. This sensing process is referred to as a " real-time sensing process ".

This real-time sensing process may be performed for each blank time between active times based on the vertical synchronization signal Vsync.

The threshold voltage sensing (Vth Sensing) of the driving transistor DRT requires a voltage saturation time of the second node N2 of the driving transistor DRT, so that the driving transistor DRT is subjected to mobility sensing It takes a relatively long time.

In consideration of this point, the threshold voltage sensing of the driving transistor DRT may proceed while the display drive is not performed after the power-off signal is generated according to user input or the like.

That is, the threshold voltage sensing of the driving transistor DRT may proceed to an off-sensing process.

The mobility sensing of the driving transistor DRT can be performed even after the power-off signal is generated, but may take place in real time before the display driving starts or during the display driving, taking into consideration that the short time is required.

That is, the mobility sensing of the driving transistor DRT may proceed to an on-sensing process before the power-on signal is generated to start the display driving, (Real-Time Sensing Process).

FIG. 8 is a diagram for explaining deterioration of the second transistor T2 due to sensing of the organic light emitting display device 100 according to the present embodiments and shortening of life.

Referring to FIG. 8, a sensing process for sensing the mobility of the driving transistor DRT is performed to allow a current to flow through the driving transistor DRT and the second transistor T2 for a predetermined period of time t. Here, the sensing process for sensing the mobility is an on-sensing process or a real-time sensing process.

The sensing unit 410 senses an increased voltage of the second node N2 of the driving transistor DRT after the current flows through the driving transistor DRT and the second transistor T2 for a predetermined period of time t, do.

Here, the voltage increase value? V of the second node N2 of the driving transistor DRT is proportional to the mobility of the driving transistor DRT during a predetermined time? T.

On the other hand, when the on-sensing process is performed each time a power-on signal is generated, the turn-on time of the OLED display 100 is increased.

If the on-sensing process is performed every time the power-on signal is generated, if the power-on signal occurs in a short cycle, the on-sensing process does not proceed unnecessarily while the mobility of the driving transistor DRT is not changed. . That is, the unnecessary on-sensing process is an on-sensing process that hardly generates a change in the amount of compensation since a sensing result that is hardly changed compared to the previous sensing result is obtained.

Further, when the on-sensing process is performed each time a power-on signal is generated,

A second transistor electrically connected between the second node N2 of the driving transistor DRT and the reference voltage line RVL and supplying the reference voltage Vref to the second node N2 of the driving transistor DRT, T2 are much driven, the second transistor T2 is greatly subjected to electrical stress.

As a result, the deterioration of the second transistor T2 is seriously generated and the lifetime can be shortened.

In addition, considering the characteristic that the second transistor T2 is used as a sensing path, deterioration of the second transistor T2 may cause a problem of lowering the sensing accuracy.

Accordingly, the organic light emitting diode display 100 according to the present embodiments can adaptively control the timing of the on-sensing process.

In the following, this adaptive sensing scheme will be described in more detail.

9 is a diagram illustrating an adaptive sensing system of the OLED display 100 according to the present embodiments.

9, the adaptive sensing system of the organic light emitting diode display 100 according to the present exemplary embodiment may be configured such that only when a predetermined "sensing condition" is satisfied when a power on signal is generated, A sensing unit 410 sensing a voltage of a sensing line connected to a sensing node of each sub-pixel SP arranged in the organic light emitting display panel 110, and the like.

Here, the voltage sensing of the sensing unit 410 proceeds in the sampling step of the sensing drive, and the number of voltage sensing times of the sensing unit 410 may correspond to the number of sensing driving times.

As described above, the sensing unit 410 senses the voltage of the sensing line only when it does not sense the voltage of the sensing line every time a power-on signal is generated, but only when it meets a predetermined "sensing condition" So that the number of times of the on-sensing process proceeding when the power-on signal is generated can be reduced accordingly.

Accordingly, the turn-on time of the OLED display 100 can be shortened. In addition, it is possible to obtain an almost unchanged sensing result compared to the previous sensing result, thereby preventing the unnecessary on-sensing process from proceeding which hardly causes a change in the amount of compensation.

In addition, the deterioration of the transistor driven in the on-sensing process can be reduced, which can prevent the lifetime of the transistor driven in the on-sensing process from being shortened.

The sensing node of each subpixel SP is electrically connected to the second node N2 of the driving transistor DRT in the corresponding subpixel, the first electrode of the organic light emitting diode OLED in the corresponding subpixel, May be any point on the connected reference voltage line (RVL).

The sensing line electrically connected to the sensing node of each subpixel SP may be a reference voltage line RVL electrically connected to the corresponding subpixel.

Each subpixel SP includes a first node N1 to which an organic light emitting diode OLED and a data voltage Vdata are applied, a second node N2 connected to a first electrode of the organic light emitting diode OLED, And a third node N3 to which a driving voltage EVDD is applied; a driving transistor DRT electrically connected between the first node N1 of the driving transistor DRT and the data line DL, A first transistor T1 for supplying a data voltage Vdata to the first node N1 of the driving transistor DRT and a second transistor N1 for supplying a data voltage Vdata connected between the first node N1 and the second node N2 of the driving transistor DRT. A capacitor Cst may be disposed.

9, the adaptive sensing system of the organic light emitting diode display 100 according to the present exemplary embodiment may be configured to satisfy a sensing condition for proceeding a sensing process for sensing a characteristic value or a characteristic value change of the driving transistor DRT And a sensing timing control unit 910 for determining whether or not the received signal is a signal.

According to the above-described sensing timing controller 910, when the power-on signal is generated, it is determined whether the sensing condition is satisfied and whether the on-sensing process is progressed or not. Thus, the number of unnecessary on- And it is possible to prevent the lifetime of the transistor driven in the on-sensing process from being shortened.

9, the adaptive sensing system of the organic light emitting diode display 100 according to the present invention includes a sensing control unit 920 for controlling the progress of a sensing process for sensing a characteristic value of the driving transistor DRT, And a compensation unit 430 for determining a compensation value for compensating for a change in a characteristic value or a characteristic value of the driving transistor DRT based on the voltage sensed by the sensing unit 410 as the sensing process proceeds .

9, the sensing timing controller 910 may generate a sensing enable signal Sen_En indicating the progress of a sensing process (e.g., an on-sensing process) when it is determined that the sensing condition is satisfied.

The sensing controller 920 controls the data driver 120, the gate driver 130, and the sensing unit (not shown) so that the sensing process for sensing the characteristic value of the driving transistor DRT proceeds when the sensing enable signal Sen_En is generated 410 and the like.

The sensing control unit 920 can control the switching operation of the initialization switch SPRE and the sampling switch SAM.

On the other hand, if it is determined that the sensing condition is not satisfied, the sensing timing control unit 910 generates a sensing disable signal Sen_DisEn for instructing the non-progress of the sensing process (e.g., the on-sensing process) ) Can be told to omit the sensing process.

Alternatively, if the sensing enable signal Sen_En is not input within a predetermined time after the sensing enable signal Sen_En has been waited for a predetermined time from the generation of the power-on signal, the sensing control unit 920 advances the sensing process I can not.

As described above, it is possible to precisely indicate whether or not the sensing process is proceeded by generating the sensing enable signal Sen_En in the sense that the sensing process may proceed.

In the present specification, two adaptive sensing methods according to two methods for determining whether or not the sensing condition is satisfied are exemplarily disclosed.

The two adaptive sensing methods determine that the sensing condition is satisfied only when a degree of change in the characteristic value of the driving transistor DRT is predicted to be greatly generated based on the "sensing process progress history" The first adaptive sensing method "and the " second adaptive sensing method " in which it is determined that the sensing condition is satisfied only when the degree of change in the characteristic value of the driving transistor DRT is predicted to be large, Sensing method ".

In the following, two adaptive sensing schemes are described in more detail.

10 and 11 are views showing a first adaptive sensing method of the OLED display 100 according to the present embodiments.

10, the sensing timing controller 910 manages information related to the generation timing of the power-on signal for the first adaptive sensing control, and manages the progress history of the sensing process progressed according to the power-on signal generation And stores the sensing process progress history information.

For example, when a new power-on signal is generated, the sensing timing control unit 910 manages a power-on time Ton corresponding to the current time point of the power-on signal, If it is progressed, the sensing process time point (Tsen) corresponding to the progress point or the end point of the sensing process is stored and the progress history is managed.

10, when a current power-on signal is generated, the sensing timing controller 910 determines whether or not a current power-on signal is generated, a power-on timing Ton, a preset threshold time TH, It is possible to determine whether or not the sensing condition is satisfied based on the previous sensing process time (Tsen) for the previous sensing process which has already been performed before the ON signal is generated.

Here, the threshold time TH means the minimum time at which the characteristic value change of the driving transistor DRT can be changed to a meaningful level (a level required to compensate for image quality deterioration).

The sensing timing control unit 910 can find the previous sensing process time (Tsen) for the previous sensing process that has already been performed before the current power-on signal is generated, from the stored sensing process progress history information.

More specifically, the sensing timing control unit 910 determines whether the time Ton-Tsen elapsed from the previous sensing process time Tsen to the power-on time is equal to or greater than the threshold time TH (S1010) If the elapsed time (Ton-Tsen) is less than the threshold time (TH), it is determined that the sensing condition is satisfied (S1020). If the elapsed time (S1030). ≪ / RTI >

Referring to FIG. 11, the sensing timing controller 910 controls the sensing timing controller 910 such that power sensing is performed after the previous sensing process (that is, after the previous sensing process time Tsen) (Ton-Tsen) during which the additional sensing process is not performed from the previous sensing process time point (Tsen) to the power-on point (Ton) at which the new power-on signal is generated, It is judged that it is necessary to proceed with the sensing process because it is highly likely that the characteristic value of the driving transistor DRT will change if the elapsed time Ton-Tsen is equal to or greater than the threshold time TH, It is finally determined that the condition is satisfied.

Accordingly, the sensing process proceeds, and then the image driving can proceed.

Referring to FIG. 11, the sensing timing controller 910 controls the sensing timing controller 910 such that power sensing is performed after the previous sensing process (that is, after the previous sensing process time Tsen) (Ton-Tsen) during which the additional sensing process is not performed from the previous sensing process time point (Tsen) to the power-on point (Ton) at which the new power-on signal is generated, It is judged that it is not necessary to proceed with the sensing process because the possibility of the characteristic value change of the driving transistor DRT is small when the elapsed time Ton-Tsen becomes less than the threshold time TH, It is finally determined that the sensing condition is not satisfied.

Accordingly, the sensing process does not proceed and the image driving can proceed immediately.

As described above, by advancing the sensing process adaptively according to the history of the sensing process, it is possible to effectively prevent the unnecessary sensing process, which can deteriorate the deterioration of the transistor and shorten the life span, effectively.

12 and 13 are views showing a second adaptive sensing method of the OLED display 100 according to the present embodiments.

12, the OLED display 100 according to the present embodiment includes a temperature sensor (not shown) for sensing and outputting the ambient temperature T of the OLED display 100 for a second adaptive sensing control, (1200).

The sensing timing controller 910 acquires the current ambient temperature T of the organic light emitting display 100 from the temperature sensor 1200 for the second adaptive sensing control in operation S1210.

The sensing timing controller 910 acquires the sensed temperature from the temperature sensor 1200 and determines whether the sensing condition is satisfied based on the sensed temperature (S1220).

On the other hand, in order to perform the first adaptive sensing control based on the temperature, the sensing timing controller 910 may store the temperature Tb at the time (Ton_before) at which the power-on signal occurs when the sensing process proceeds have.

12 and 13, the sensing timing control unit 910 determines whether or not the temperature change (? T = T-Tb) is equal to or higher than a preset constant level (K) based on the sensed temperature T ), It is determined that the sensing condition is satisfied (S1230), and if it is less than the sensing condition, it can be determined that the sensing condition is not satisfied (S1240).

12 and 13, in a different manner, the sensing timing controller 910 determines whether the sensed temperature T deviates from a predetermined normal temperature range (R, for example, a normal temperature range) (S1220 , It is determined that the sensing condition is satisfied (S1230). If not, the sensing condition is determined to be unsatisfactory (S1240).

The sensing timing control unit 910 determines whether the temperature change or the current ambient temperature is capable of generating a characteristic value change of the driving transistor DRT based on the current ambient temperature T at the time Ton when the power- And the sensing process is selectively performed only when the temperature change is large enough to cause a change in the characteristic value of the driving transistor DRT or if the current ambient temperature is in a non-normal temperature range (a low temperature range or a high temperature range instead of a normal temperature range) Can be controlled to proceed.

As described above, by advancing the sensing process adaptively according to the temperature, it is possible to effectively prevent the progress of the unnecessary sensing process which can deteriorate the deterioration of the transistor and shorten the life span.

FIG. 14 is a view illustrating an embodiment of an organic light emitting diode display 100 according to the present embodiments.

The organic light emitting display 100 according to the embodiments described above can be implemented as shown in FIG.

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

Each source driver integrated circuit (SDIC) is connected to a bonding pad of the organic light emitting display panel 110 by a tape automated bonding (TAB) method or a chip on glass (COG) Or may be directly disposed on the organic light emitting display panel 110, and may be integrated and disposed on the organic light emitting display panel 110, as the case may be.

In addition, each source driver integrated circuit (SDIC) may be implemented by a chip on film (COF) method, which is mounted on a film SF connected to the organic light emitting display panel 110.

The gate driver 130 may include at least one gate driver integrated circuit (GDIC).

Each gate driver integrated circuit GDIC may be connected to a bonding pad of the organic light emitting display panel 110 by a tape automated bonding (TAB) method or a chip on glass (COG) ) Type and may be directly disposed on the organic light emitting display panel 110 or may be integrated on the organic light emitting display panel 110 as the case may be.

In addition, each gate driver IC (GDIC) may be implemented by a chip on film (COF) method which is mounted on a film (GF) connected to the organic light emitting display panel (110).

The organic light emitting diode display 100 according to the present embodiment includes at least one source printed circuit board (SPCB) and a control part (not shown) necessary for circuit connection to at least one source driver integrated circuit (SDIC) And a control printed circuit board (CPCB) for mounting various electric devices.

At least one source driver integrated circuit (SDIC) may be directly mounted on at least one source printed circuit board (SPCB), or a film (SF) mounted with at least one source driver integrated circuit (SDIC) may be connected.

The control printed circuit board CPCB includes a controller 140 for controlling the operation of the data driver 120 and the gate driver 130 and the like and the organic light emitting display panel 110, the data driver 120, and the gate driver 130 ) Or the like, or a power controller for controlling various voltages or currents to supply or supply various voltages or currents.

The at least one source printed circuit board (SPCB) and the control printed circuit board (CPCB) may be circuitly connected via at least one connection member.

Here, the connecting member may be a flexible printed circuit (FPC), a flexible flat cable (FFC), or the like.

At least one source printed circuit board (SPCB) and a control printed circuit board (CPCB) may be integrated into one printed circuit board.

In addition, the controller 140 may be implemented integrally with a source driver integrated circuit (SDIC).

14, the temperature sensor 120 may be located anywhere in the organic light emitting display 100, but may be mounted on a source printed circuit board (SPCB), for example.

14, in addition to the controller 140 for controlling the driving of the organic light emitting display panel 110, a main controller 1400 for controlling the overall operation of the organic light emitting display 100 may be further provided.

The above-mentioned sensing control unit 920 may be included in the controller 140.

The sensing timing control unit 910 may be included in the controller 140 or may be included in the main controller 1400.

The controller 140 and the main controller 1400 may exist separately, but may be integrated into one.

Hereinafter, the driving method of the organic light emitting diode display 100 described above will be briefly described again.

15 is a flowchart of a method of driving the organic light emitting diode display 100 according to the present embodiments.

Referring to FIG. 15, a method of driving an organic light emitting display 100 according to the present invention includes a first step (S1510) of determining whether a predetermined sensing condition is satisfied according to generation of a power-on signal, A second step S1520 of sensing a change in a characteristic value or a characteristic value of the driving transistor DRT when it is determined that the sensing condition is satisfied; A third step (S1530) of displaying an image, and the like.

By using the above driving method, it is possible to shorten the turn-on time of the OLED display 100 by selectively conducting the sensing process when a power-on signal is generated and reduce the driving time of the transistor T2 related to the sensing process It is possible to prevent subject deterioration and shortening the life span.

In the first step S1510, the OLED display 100 displays the power-on time at which the power-on signal is generated, the preset threshold time, the previous sensing process that has already been performed before the power- It is possible to determine whether or not the sensing condition is satisfied based on the time point of the previous sensing process.

In the first step S1510, the OLED display 100 can determine whether the sensing condition is satisfied based on the ambient temperature.

16 is a flowchart of a sensing step in the driving method of the OLED display 100 according to the present embodiments. However, FIG. 16 exemplifies the mobility sensing step.

16, the second step S1520 of the sensing process is to apply the sensing driving data voltage Vdata to the first node N1 of the driving transistor DRT, The initialization step S1610 of applying the reference voltage Vref to the second node N2 and the second node N2 of the driving transistor DRT to float the second node N2 of the driving transistor DRT, A sampling step S1630 of sensing the voltage V2 of the second node N2 of the driving transistor DRT.

As described above, the characteristic value (e.g., mobility, threshold voltage) of the driving transistor DRT in the sub-pixel or its change can be effectively sensed by proceeding to the second step S1520 of advancing the sensing process.

17 is a block diagram showing a controller 140 of the OLED display 100 according to the present embodiments.

17, the controller 140 of the OLED display 100 according to the present embodiment includes a determination unit 1710 for determining whether a sensing condition is satisfied at the present time according to the generation of a power-on signal, And controls the sensing process to sense a characteristic value or a characteristic value change of the driving transistor DRT in each sub-pixel SP when the sensing condition is satisfied. If the sensing condition is not satisfied, And a controller 1720 for controlling the display panel 110 to drive the image driving for displaying an image.

According to the above description, it is possible to provide the controller 140 that can determine whether or not the sensing process is performed when the power-on signal is generated and selectively control whether the sensing process is performed.

The determination unit 1710 may be the same as or corresponding to the sensing timing controller 910 described above in terms of functions and roles.

The control unit 1720 may have the same or corresponding configuration as the sensing control unit 920 in terms of functions and roles.

That is, the controller 140 of FIG. 17 includes both the sensing timing controller 910 and the sensing controller 920.

18 is another block diagram showing the controller 140 of the OLED display 100 according to the present embodiments.

18, the controller 140 of the OLED display 100 according to the present embodiment includes a signal input unit 1810 receiving a sensing enable signal Sen_En when a power-on signal is generated, When the sensing enable signal Sen_En is inputted, the sensing process for sensing the characteristic value or the characteristic value change of the driving transistor DRT in each subpixel SP is controlled to proceed. When the sensing enable signal Sen_En is not inputted The controller 1820 controls the organic light emitting diode display panel 110 to display images on the organic light emitting display panel 110 without progressing the sensing process.

According to the above description, a controller (Sen_En) for instructing whether or not the sensing process is to proceed is input to a controller (not shown) 140 may be provided.

The signal input unit 1810 receives the sensing enable signal Sen_En from the sensing timing controller 910. The controller 1720 controls the sensing operation of the sensing enable signal Sen_En May be the same as or corresponding to the sensing control unit 920 for controlling the sensing unit 920.

The controller 140 in Fig. 18 receives an instruction from the sensing timing control unit 910 located outside the controller 140 (e.g., the main controller 1400) to determine whether or not the sensing process is proceeding.

According to the embodiments as described above, the controller 140 can selectively perform the sensing process without sensing the characteristic value or the change of the sub-pixel every time a power-on signal is generated, Device 100 and a method of driving the same.

According to the embodiments, it is possible to provide the controller 140, the organic light emitting display device 100, and the driving method thereof, which can prevent unnecessary and meaningless sensing processes from proceeding each time a power-on signal is generated.

According to the embodiments of the present invention, a controller 140 that enables adaptive sensing control to prevent deterioration of the transistor and lifetime shortening of the transistor driven according to the sensing drive for compensating for the characteristic value deviation of the subpixel, (100) and a driving method thereof.

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 within the scope of equivalents should be construed as falling within the scope of the present invention.

100: organic light emitting display
110: organic light emitting display panel
120: Data driver
130: gate driver
140: controller

Claims (15)

A plurality of data lines and a plurality of gate lines are arranged, a plurality of data lines and a plurality of subpixels defined by the plurality of gate lines are arranged, and each subpixel has an organic light emitting diode and a data voltage A driving transistor having a first node, a second node connected to the first electrode of the organic light emitting diode, and a third node to which a driving voltage is applied; and a driving transistor electrically connected between the first node of the driving transistor and the data line, A first transistor for supplying a data voltage to a first node of the driving transistor, and a storage capacitor connected between a first node and a second node of the driving transistor; And
And a sensing unit that senses a voltage of a sensing line electrically connected to a sensing node of each sub-pixel only when a predetermined sensing condition is satisfied when a power-on signal is generated. The method according to claim 1,
Further comprising a sensing timing control unit for determining whether the sensing condition for advancing a sensing process for sensing a change in a characteristic value or a characteristic value of the driving transistor is satisfied. 3. The method of claim 2,
The sensing timing control unit includes:
An organic light emitting display for judging whether or not a sensing condition is satisfied based on a power-on point at which a power-on signal is generated, a preset threshold time, and a previous sensing process time for a previous sensing process that has already proceeded before the power- Device. The method of claim 3,
The sensing timing control unit includes:
And determines that the sensing condition is satisfied if the time elapsed from the time of the previous sensing process to the power-on time is equal to or longer than the threshold time. 3. The method of claim 2,
Further comprising a temperature sensor for sensing the ambient temperature,
The sensing timing control unit includes:
And determines whether the sensing condition is satisfied based on the sensed temperature. 6. The method of claim 5,
The sensing timing control unit includes:
And determines that the sensing condition is satisfied if the temperature change becomes a certain level or more based on the sensed temperature. 6. The method of claim 5,
The sensing timing control unit includes:
And determines that the sensing condition is satisfied if the sensed temperature deviates from a predetermined normal temperature range. The method according to claim 1,
Wherein the sensing timing control unit generates a sensing enable signal when it is determined that the sensing condition is satisfied,
A sensing control unit for controlling the progress of a sensing process for sensing a characteristic value of the driving transistor when the sensing enable signal is generated; And
Further comprising a compensation unit for determining a compensation value for compensating a change in a characteristic value or a characteristic value of the driving transistor based on a voltage sensed by the sensing unit when the sensing process is performed. The method according to claim 1,
Each of the sub-
A second transistor electrically connected between a second node of the driving transistor and a reference voltage line and supplying a reference voltage to a second node of the driving transistor,
Wherein the sensing unit is electrically connected to the reference voltage line. A plurality of data lines and a plurality of gate lines are arranged, a plurality of data lines and a plurality of subpixels defined by the plurality of gate lines are arranged, and each subpixel has an organic light emitting diode and a data voltage A driving transistor having a first node, a second node connected to the first electrode of the organic light emitting diode, and a third node to which a driving voltage is applied; and a driving transistor electrically connected between the first node of the driving transistor and the data line, An organic light emitting display panel in which a first transistor for supplying a data voltage to a first node of the driving transistor and a storage capacitor connected between a first node and a second node of the driving transistor are arranged; A data driver, and a gate driver for driving the plurality of gate lines, In the driving method for a display device,
A first step of determining whether a predetermined sensing condition is satisfied in accordance with generation of a power-on signal;
A second step of performing a sensing process for sensing a characteristic value or a characteristic value change of the driving transistor when it is determined that the sensing condition is satisfied; And
And a third step of displaying an image on the organic light emitting display panel when the sensing process is completed. 11. The method of claim 10,
The second step comprises:
An initializing step of applying a sensing driving data voltage to a first node of the driving transistor and applying a reference voltage to a second node of the driving transistor;
A tracking step of floating the second node of the driving transistor to change the voltage of the second node of the driving transistor; And
And a sampling step of sensing a voltage of a second node of the driving transistor. 11. The method of claim 10,
In the first step, the organic light emitting display includes:
An organic light emitting display for judging whether or not a sensing condition is satisfied based on a power-on point at which a power-on signal is generated, a preset threshold time, and a previous sensing process time for a previous sensing process that has already proceeded before the power- A method of driving a device. 11. The method of claim 10,
In the first step, the organic light emitting display includes:
And determining whether the sensing condition is satisfied based on the ambient temperature. A determination unit for determining whether a sensing condition is satisfied at the present time according to generation of a power-on signal; And
The organic light emitting display panel may be configured to control the organic light emitting display panel so that a sensing process for sensing a change in a characteristic value or a characteristic value of a driving transistor in each sub pixel is performed when the sensing condition is satisfied, And a controller for controlling the video driving to display the video. A signal input unit for receiving a sensing enable signal when a power-on signal is generated; And
When the sensing enable signal is inputted, the control unit controls the sensing process to sense the characteristic value or the characteristic value change of the driving transistor in each sub-pixel. When the sensing enable signal is not inputted, And a controller for controlling the image driving to display the image on the light emitting display panel.

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