KR20170081051A - Organic light emitting display device and method for driving the organic light emitting display device - Google Patents

Abstract

The present invention relates to a method of driving an organic light emitting diode (OLED) display device and a method of driving the same, in which a timing controller of an OLED display receives image data from a host system in a period during which a characteristic value of a circuit element in a sub- In addition, since no operation for processing image data is performed, it is possible to minimize the noise due to the image data reception and processing in the sensing period to improve the accuracy of the sensing data, to prevent the screen failure after the compensation, .

Description

TECHNICAL FIELD [0001] The present invention relates to an organic light emitting diode (OLED) display device,

The present embodiments relate to an organic light emitting display and a method of driving the organic light emitting display.

BACKGROUND ART [0002] Organic light emitting displays (OLEDs), which have been popular as display devices in recent years, have advantages of high response speed, high contrast ratio, luminous efficiency, luminance and viewing angle by using an organic light emitting diode (OLED)

The OLED display includes an OLED display panel having a plurality of gate lines and a plurality of data lines and a plurality of subpixels arranged in a region where gate lines and data lines cross each other, A data driver for driving the plurality of data lines, a timing controller for controlling the driving of the gate driver and the data driver, and the like. Each sub-pixel includes an organic light emitting diode (OLED) and an organic light emitting diode (Not shown).

The circuit elements such as the organic light emitting diode OLED and the driving transistor included in each sub pixel each have a unique characteristic value (e.g., threshold voltage, mobility), and the degradation ), And the characteristic value may be changed.

The luminance characteristics of the subpixels including the circuit elements can be changed according to the change in the characteristic value of the circuit element and the luminance deviation between the subpixels when the characteristic values or the characteristic value changes between the circuit elements are different, And there is a problem that the afterimage area is generated.

In order to solve such a problem, a technique of sensing and compensating characteristic values of circuit elements in each sub-pixel has been applied.

At this time, it is very important to accurately sense the characteristic values of the respective circuit elements in sensing and compensating the characteristic values of the circuit elements in each sub-pixel. However, due to the noise generated in the sensing period, ) May be included.

When the error is included in the sensing data, compensation for the deterioration of the circuit element is performed based on the sensing data including the error, so that the error of the sensing data may be reflected in the compensation value, resulting in a screen defect after compensation.

Therefore, in order to improve the accuracy of the sensing data and the compensation performance in the section for sensing the characteristic values of the circuit elements included in the subpixels of the organic light emitting display device, a technique for minimizing the noise generated in the sensing and compensation sections is required.

It is an object of the present embodiments to provide an organic light emitting display device and a method of driving the same that minimize noise generated in a period of sensing a characteristic value of a circuit element included in a sub pixel of an organic light emitting display device.

It is an object of the present embodiments to provide an organic light emitting display device and a driving method thereof that improve the accuracy of sensing the characteristic value of a circuit element included in a subpixel of an organic light emitting display device and the compensation performance according to sensing.

One embodiment includes an organic light emitting display panel in which a plurality of gate lines and a plurality of data lines are arranged in an intersection and a plurality of subpixels are arranged in a region where gate lines and data lines intersect each other, A data driver for driving the plurality of data lines, and a timing controller for controlling driving of the gate driver and the data driver, wherein the timing controller is configured to receive image data from the host system, It is possible to provide an organic light emitting display device that does not receive image data from the host system during a period of sensing the characteristic value.

According to another embodiment of the present invention, there is provided an OLED display including an OLED display panel in which a plurality of gate lines and a plurality of data lines are disposed in an intersection and a plurality of subpixels are arranged in a region where gate lines and data lines intersect, A host system for receiving image data from the host system, converting the received image data into a signal format used by a data driver, and sensing a characteristic value of a circuit element included in the subpixel, It is possible to provide an organic light emitting display device including a timing controller that does not receive data.

Another embodiment is a driving method of an OLED display device including an organic light emitting display panel in which a plurality of gate lines and a plurality of data lines are arranged in an intersection and a plurality of subpixels are arranged in a region where gate lines and data lines intersect Receiving a video data from a host system; transmitting a sensing start signal to a host system at a timing to start sensing a characteristic value of a circuit element included in the subpixel; and sensing a characteristic value of the circuit element included in the subpixel The method comprising the steps of: receiving image data from the host system during a period during which the sensing of the characteristic values of the circuit elements included in the subpixels is completed; A driving method of the light emitting display device can be provided.

According to the embodiments, the image data input from the host system is blocked in a period for sensing the characteristic value of the circuit element included in the sub-pixel of the organic light emitting display device, So that the noise included in the sensing data can be reduced.

According to the embodiments, by improving the accuracy of the sensing data with respect to the characteristic values of the circuit elements included in the sub-pixels of the organic light emitting diode display, it is possible to improve the compensation performance against the characteristic values of the circuit elements, do.

According to the embodiments, unnecessary switching is reduced without receiving image data so as to prevent noise from occurring in a section for sensing a characteristic value of a circuit element included in a sub-pixel of the organic light emitting display device, thereby reducing power consumption .

FIG. 1 is a diagram showing a schematic configuration of an organic light emitting display according to the present embodiments.
2 is a diagram illustrating an example of a sub-pixel structure of an OLED display according to an exemplary embodiment of the present invention.
3 is a diagram illustrating an example of a sub-pixel structure and a compensation circuit of an organic light emitting display according to the present embodiments.
4 is a diagram illustrating an example of timing for sensing a characteristic value of a circuit element included in a sub pixel of an organic light emitting display according to the present embodiments.
FIGS. 5 to 8 are diagrams for explaining an operation of reducing the noise generated in a period in which the timing controller of the organic light emitting display according to the present embodiments senses a characteristic value of a circuit element included in a sub-pixel.
9 is a diagram showing an example of a section in which the timing controller of the organic light emitting diode display according to the present embodiments receives image data from the host system.
10 is a flowchart illustrating a method of driving an OLED display according to an exemplary embodiment of the present invention.

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 shows a schematic configuration of an OLED display 100 according to the present embodiments.

1, the OLED display 100 includes a plurality of gate lines GL and a plurality of data lines DL, a gate line GL and a data line DL, An organic light emitting diode (OLED) display panel 110 including a plurality of subpixels SP disposed in the intersecting region, a gate driver 120 driving a plurality of gate lines GL, a plurality of data lines DL, And a timing controller 140 (T-CON) for controlling the gate driver 120 and the data driver 130. The timing controller 140 controls the gate driver 120 and the data driver 130,

The gate driver 120 sequentially drives the plurality of gate lines GL by sequentially supplying scan signals to the plurality of gate lines GL.

The gate driver 120 sequentially supplies a scan signal of an ON voltage or an OFF voltage to the plurality of gate lines GL in accordance with the control of the timing controller 140, Respectively.

The gate driver 120 may be located on one side or both sides of the organic light emitting display panel 110 according to the driving method.

In addition, the gate driver 120 may include one or more gate driver integrated circuits.

Each gate driver integrated circuit 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) method, (Gate In Panel) type and may be directly disposed on the organic light emitting display panel 110.

The organic light emitting display panel 110 may be integrated with the organic light emitting display panel 110 or may be implemented as a chip on film (COF) method mounted on a film connected to the organic light emitting display panel 110.

The data driver 130 drives the plurality of data lines DL by supplying data voltages to the plurality of data lines DL.

When the specific gate line GL is opened, the data driver 130 converts the image data received from the timing controller 140 into analog data voltages and supplies the data voltages to the plurality of data lines DL, .

The data driver 130 may include at least one source driver integrated circuit to drive a plurality of data lines DL.

Each source driver integrated circuit 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) Or may be integrated and disposed in the organic light emitting display panel 110. [

In addition, each source driver integrated circuit may be implemented in a chip-on-film (COF) manner. 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 organic light emitting display panel 110.

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

The timing 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 130, and outputs the converted image data And controls the data driving at a proper time according to the scan.

The timing controller 140 outputs various timing signals including a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, an input data enable (DE) signal, a clock signal CLK, (E.g., a host system).

The timing controller 140 may switch the input video data inputted from the outside according to the data signal format used by the data driver 130 and output the converted video data to the gate driver 120 and the data driver 130 A timing signal such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, an input data enable signal DE and a clock signal CLK to generate various control signals, (120) and the data driver (130).

For example, in order to control the gate driver 120, 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 gate driver integrated circuits constituting the gate driver 120. 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.

The timing controller 140 includes a source start pulse SSP, a source sampling clock SSC, a source output enable signal SOE, 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 data driver 130. 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 130.

The timing controller 140 is connected to a source printed circuit board to which a source driver integrated circuit is bonded and a control printed circuit (not shown) connected via a connection medium such as a flexible flat cable (FFC) or a flexible printed circuit And may be disposed on a substrate (Control Printed Circuit Board).

A power controller (not shown) for controlling various voltages or currents to supply or supply various voltages or currents to the organic light emitting display panel 110, the gate driver 120, the data driver 130, . These power controllers are also referred to as power management integrated circuits.

Each sub-pixel SP disposed in the organic light emitting display panel 110 may include a circuit element such as a transistor.

For example, in the organic light emitting display panel 110, each subpixel SP is composed of circuit elements such as a driving transistor (DRT) for driving the organic light emitting diode OLED and the organic light emitting diode OLED .

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

2 shows an example of the sub-pixel (SP) structure of the organic light emitting diode display 100 according to the present embodiments.

2, each of the sub-pixels SP includes an organic light emitting diode OLED, a driving transistor DRT for driving the organic light emitting diode OLED, And a sensing transistor SENT which is electrically connected between a first node N1 of the driving transistor DRT and a reference voltage line RVL for supplying a reference voltage Vref A switching transistor SWT electrically connected between a second node N2 of the driving transistor DRT and a data line DL supplying a data voltage Vdata; And a storage capacitor Cstg electrically connected between the first node N1 and the second node N2.

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).

The driving transistor DRT supplies a driving current to the organic light emitting diode OLED to drive the organic light emitting diode OLED.

The first node N1 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 second node N2 of the driving transistor DRT may be electrically connected to the source node or the drain node of the switching transistor SWT and may be a gate node. The third node N3 of the driving transistor DRT may be electrically connected to a driving voltage line DVL for supplying a driving voltage EVDD and may be a drain node or a source node.

The sensing transistor SENT may be turned on by a gate signal to apply the reference voltage Vref to the first node N1 of the driving transistor DRT.

In addition, the sensing transistor SENT may be utilized as a voltage sensing path for the first node N1 of the driving transistor DRT when turned on.

The switching transistor SWT transfers the data voltage Vdata supplied through the data line DL to the second node N2 of the driving transistor DRT when the switching transistor SWT is turned on by the gate signal.

At this time, the sensing transistor SENT and the switching transistor SWT may be connected to different gate lines GL so that the sensing transistor SENT and the switching transistor SWT may be separately controlled to be turned on and off or may be connected to the same gate line GL to be controlled.

The storage capacitor Cstg is electrically connected between the first node N1 and the second node N2 of the driving transistor DRT and supplies a data voltage Vdata corresponding to the video signal voltage or a voltage corresponding thereto You can keep it for one frame time.

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 (e.g., threshold voltage, mobility, etc.) of the circuit elements such as the organic light emitting diode OLED and the driving transistor DRT can be changed.

A change in the characteristic value of the circuit element causes a luminance change of the corresponding sub-pixel SP, and a difference in characteristic value between the circuit elements due to a difference in degree of deterioration between the circuit elements generates a luminance deviation between the sub- The luminance uniformity of the panel 110 may be lowered.

Here, the characteristic value of the circuit element includes the threshold voltage and the mobility of the driving transistor DRT and may include the threshold voltage of the organic light emitting diode OLED.

The OLED display 100 according to the present embodiment includes a sensing function for sensing a characteristic value variation between subpixels SP or a characteristic value deviation between each subpixel SP, Can be provided.

FIG. 3 shows an example of a sub-pixel (SP) structure and a compensation circuit of the organic light emitting diode display 100 according to the present embodiments.

3, the OLED display 100 according to the present embodiment includes a sensing unit 310, a compensation unit 320, a memory 330, and a driving unit 330 for sensing and compensating the characteristic value of the subpixel SP. A reference voltage switch SPRE and a sampling switch SAMP.

The sensing unit 310 senses a characteristic value of the sub-pixel SP or a voltage for sensing the change, converts the sensed voltage into a digital value, and outputs sensed data including the sensed sensed value. Here, the characteristic value of the subpixel SP means the threshold voltage and the mobility of the driving transistor DRT and the threshold voltage of the organic light emitting diode OLED, and the sensing data is in a low voltage differential signaling (LVDS) data format .

The sensing unit 310 may include at least one analog-to-digital converter (ADC). Each analog-to-digital converter (ADC) may be included inside the source driver integrated circuit, and in some cases, it may be disposed outside the source driver integrated circuit.

The compensation unit 320 performs a compensation process for compensating for the characteristic value deviation between the subpixels SP by sensing the characteristic value or the change of the subpixel SP using the sensing data output from the sensing unit 310. [

The compensation unit 320 may be included in the timing controller 140 and may be disposed outside the timing controller 140 in some cases.

The memory 330 may store the sensing data output from the sensing unit 310 and may store the compensation value calculated by the compensating unit 320 based on the sensing data.

The reference voltage switch SPRE controls the supply of the reference voltage Vref to the reference voltage line RVL and the sampling switch SAMP controls the supply of the reference voltage Vref to the reference voltage line RVL in order to sense the voltage for sensing the characteristic value of the sub- And controls the connection between the voltage line RVL and the sensing unit 310.

When the reference voltage switch SPRE is turned on, the reference voltage Vref is supplied to the reference voltage line RVL. The reference voltage Vref supplied to the reference voltage line RVL may be applied to the first node N1 of the driving transistor DRT through the sensing transistor SENT which is turned on.

On the other hand, when the voltage of the first node N1 of the driving transistor DRT becomes a voltage state reflecting the characteristic value of the subpixel SP, a reference potential that can be equal to the first node N1 of the driving transistor DRT The voltage of the voltage line RVL may also be a voltage state reflecting the characteristic value of the subpixel SP. At this time, the line capacitor formed on the reference voltage line RVL may be charged with a voltage reflecting the characteristic value of the subpixel SP.

That is, when the sensing transistor SENT is turned on, the voltage of the first node N1 of the driving transistor DRT is lower than the voltage of the reference voltage line RVL and the voltage of the line RVL formed on the reference voltage line RVL. The voltage charged in the capacitor may be the same.

When the voltage of the first node N1 of the driving transistor DRT becomes a voltage state reflecting the characteristic value of the sub pixel SP, the sampling switch SAMP is turned on, (RVL) can be connected.

Accordingly, the sensing unit 310 senses the voltage of the reference voltage line RVL in a voltage state reflecting the characteristic value of the sub-pixel SP. Here, the reference voltage line RVL may be referred to as a "sensing line SL ".

That is, the sensing unit 310 senses the voltage of the first node N1 of the driving transistor DRT.

The voltage sensed by the sensing unit 310 may be a voltage value including a threshold voltage Vth or a threshold voltage change DELTA Vth of the driving transistor DRT in the case of threshold voltage sensing for the driving transistor DRT.

The voltage sensed by the sensing unit 310 may be a voltage value for sensing the mobility of the driving transistor DRT in the case of mobility sensing for the driving transistor DRT.

The voltage sensed by the sensing unit 310 may be a voltage that reflects a threshold voltage, which is a characteristic value of the organic light emitting diode OLED.

The sensing unit 310 converts the sensed voltage Vsen into a digital value according to a threshold voltage or mobility sensing drive, and generates and outputs sensing data including the sensed sensing value. The sensing data output from the sensing unit 310 may be stored in the memory 330 or may be provided to the compensating unit 320.

The compensation unit 320 is configured to grasp a characteristic value or a characteristic value change of the driving transistor DRT in the corresponding subpixel SP based on the sensing data provided by the sensing unit 310 or the sensing data stored in the memory 330, Lt; / RTI >

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 may include a process of calculating a compensation value for compensating for a threshold voltage or a threshold voltage deviation and storing the calculated compensation value in the memory 330 or changing the corresponding video data with the calculated compensation value have.

The mobility compensation process includes a process of calculating a compensation value to compensate for mobility or mobility deviation, storing the calculated compensation value in the memory 330, or changing the corresponding image data with the calculated compensation value .

The compensation unit 320 may change the image data through the threshold voltage compensation process or mobility compensation process and supply the changed data to the corresponding source driver integrated circuit in the data driver 130. [

Accordingly, the source driver integrated circuit converts the data changed by the compensation unit 320 into a data voltage through a digital to analog converter (DAC) and supplies the data voltage to the corresponding subpixel SP, SP) to be compensated for.

By compensating the characteristic values of the sub-pixels SP, the luminance deviation between the sub-pixels SP is reduced or prevented, thereby improving the luminance uniformity of the organic light emitting display panel 110 and improving the image quality.

4 is a timing chart showing the sensing timing of the OLED display 100 according to the present embodiment.

Referring to FIG. 4, the organic light emitting display 100 according to the present embodiment includes a plurality of sub-pixels SP disposed in the organic light emitting display panel 110 after a power- The characteristic value of the circuit element can be sensed.

In this way, the ongoing sensing after the power-off signal is generated is referred to as " off-sensing ".

In addition, the organic light emitting display 100 according to the present embodiment may be configured such that a power-on signal is generated according to a user input or the like, SP) can be sensed.

As described above, the sensing that is performed before the image driving is progressed after the power-on signal is generated is referred to as " on-sensing ".

The organic light emitting diode display 100 according to the present exemplary embodiments may sense characteristic values of circuit elements in each subpixel SP disposed in the organic light emitting display panel 110 during image driving.

As described above, the sensing progressed during the image driving is called "real-time sensing ".

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

The timing controller 140 receives the image data from the outside in the section for sensing the characteristic values of the circuit elements included in the sub pixels SP arranged in the organic light emitting display panel 110 in the organic light emitting diode display 100 And process the received image data.

The timing controller 140 receives image data from the outside and processes the received image data in a period during which the characteristic value of the circuit element included in the subpixel SP is sensed. As a result, noise may be generated, Can affect the sensing data on the characteristic value of the circuit element.

Accordingly, the noise may include an error in the sensing data. If the compensation is performed based on the sensing data including the error, there is a problem that a screen failure may occur after the compensation.

The present embodiments provide a sensing driving method that senses a characteristic value of a circuit element included in a subpixel SP and performs compensation according to the characteristic value and reduces a noise generated in a sensing period of a characteristic value of a circuit element do.

5 to 8 illustrate the manner in which the OLED display 100 operates in a period during which the characteristic values of the circuit elements included in the subpixels SP of the OLED display 100 according to the present embodiments are sensed Fig.

5 to 8, the OLED display 100 according to the present embodiment includes a host system 500 for outputting image data displayed on the organic light emitting display panel 110, a host system 500, And a timing controller 140 for receiving the output image data, processing the received image data, and outputting the processed image data to the data driver 130.

5 shows a step in which the host system 500 outputs image data to the timing controller 140. Referring to FIG. 5, the host system 500 receives a power-on signal according to a user's input or the like And transmits the power-on signal to the timing controller 140 so that the timing controller 140 is driven, and the video data is output to the timing controller 140.

Upon receiving the video data from the host system 500, the timing controller 140 converts the received video data into a signal format used by the data driver 130 and transmits the converted video data to the data driver 130.

The timing controller 140 controls driving of the gate driver 120 so that the data driver 130 supplies data to each data line DL in synchronization with the timing of driving the gate line GL by the gate driver 120 So that an image is displayed on the organic light emitting display panel 110.

The timing controller 140 senses the characteristic values of the circuit elements such as the organic light emitting diode OLED and the driving transistor DRT included in the subpixels SP disposed in the organic light emitting display panel 110, And performs a compensation process for compensating for a change or variation in characteristic value due to deterioration of the circuit element based on the characteristic value.

6 shows a step in which the timing controller 140 starts to sense a characteristic value of a circuit element included in the subpixel SP and Fig. 7 shows a case where the timing controller 140 detects the characteristic of the circuit element included in the subpixel SP The method comprising the steps of:

6 and 7, the timing controller 140 transmits a sensing start signal to the host system 500 at the start timing of the section for sensing the characteristic value of the circuit element.

The timing controller 140 transmits a sensing start signal and performs sensing of characteristic values of circuit elements included in the subpixel SP and the host system 500 receives a sensing start signal from the timing controller 140 The timing controller 140 does not output image data.

Therefore, the timing controller 140 does not receive the image data from the host system 500 during the period of sensing the characteristic value of the circuit element included in the sub-pixel SP.

The period during which the timing controller 140 senses the characteristic value of the circuit element included in the subpixel SP may be a period during which off-sensing proceeds after the power-off signal is generated or a period during which the power- It may be a section where sensing is proceeding.

When the timing controller 140 senses the characteristic value of the circuit element included in the sub-pixel SP by off-sensing, the timing controller 140 controls the host system (not shown) according to the sensing start signal transmitted to the host system 500 500 may not output the image data.

Alternatively, the host system 500 may transmit the power-off signal to the timing controller 140 and not simultaneously output the video data to the timing controller 140.

When the timing controller 140 senses the characteristic values of the circuit elements included in the sub-pixel SP by on-sensing, the timing controller 140 controls the host system (not shown) in response to the sensing start signal transmitted to the host system 500 500 may not output the image data, but the host system 500 may transmit the power-on signal and may not output the image data to the timing controller 500 at the same time.

That is, the timing controller 140 interrupts the image data output from the host system 500 during the period in which the characteristic value of the circuit element included in the sub-pixel SP is sensed, because the timing controller 140 controls the host system 500 , But it may be started according to the power-on signal or the power-off signal transmitted by the host system 500 according to the sensing period.

The timing controller 140 may include an image processing unit (not shown) for processing image data received from the host system 500 and may receive image data from the host system 500 while the image data is not being received from the host system 500, The image processor stops the processing of the received image data during a period of sensing the characteristic values of the circuit elements included in the image signal SP.

Accordingly, the timing controller 140 does not receive the image data from the host system 500 during the period of sensing the characteristic value of the circuit element included in the subpixel SP, and the image processing unit for processing the image data does not operate So as to minimize unnecessary switching, thereby minimizing the noise generated during the period in which the characteristic value of the circuit element is sensed.

The timing controller 140 minimizes the noise included in the sensing data obtained as a result of the sensing of the characteristic value of the circuit element included in the subpixel SP by minimizing the noise generated during the sensing period, So that a screen defect due to the compensation performed based on the sensing data does not occur.

Also, during the sensing period, the host system 500 does not output the image data to the timing controller 140, and the timing controller 140 blocks the switching due to the image data processing operation, thereby reducing the power consumed thereby .

For example, when the timing controller 140 senses a characteristic value of a circuit element included in the sub-pixel SP in the on-sensing period, the image data is stored for a time corresponding to the on- When the sensing is performed in the off-sensing period, the image data is not output for a time corresponding to the off-sensing period (for example, about 6 minutes), thereby reducing power consumption .

Therefore, the OLED display 100 according to the present embodiment is configured such that the host system 500 outputs the image data during a period in which the timing controller 140 senses the characteristic value of the circuit element included in the subpixel SP The timing controller 140 does not perform the processing on the image data, thereby minimizing the noise generated in the sensing period, thereby improving the reliability of the sensing data, and at the same time, reducing the power consumed during the sensing period do.

8 shows a step in which the timing controller 140 completes the characteristic value sensing of the circuit elements included in the subpixel SP.

Referring to FIG. 8, the timing controller 140 transmits a sensing completion signal to the host system 500 when the characteristic value sensing of the circuit elements included in the sub-pixel SP is completed.

The host system 500 receives the sensing completion signal from the timing controller 140 in a state in which it does not output the image data after receiving the sensing start signal from the timing controller 140 and outputs the image data to the timing controller 140 Start printing.

At this time, when the timing controller 140 senses the characteristic values of the circuit elements included in the sub-pixel SP in the on-sensing period, the host system 500 controls the image sensing circuit 140, in response to the sensing completion signal received from the timing controller 140, And outputs the data to the timing controller 140.

However, when the timing controller 140 senses the characteristic value for the circuit element included in the sub-pixel SP in the off-sensing period, since the host system 500 has transmitted the power-off signal, 140 and receives a new power-on signal from the outside, and starts to output image data.

The timing controller 140 receives the image data from the host system 500 when it transmits the sensing completion signal to the host system 500 and also performs an operation for processing the image data.

Accordingly, the timing controller 140 does not receive the image data from the host system 500 during the period of sensing the characteristic value of the circuit element included in the sub-pixel SP, and does not perform processing on the received image data , So that the noise generated in the sensing period can be minimized.

Accordingly, during the sensing period, the video data output of the host system 500 is stopped and the timing controller 140 stops the video data processing. Thereby reducing power consumption.

9 shows an example of a section in which the host system 500 does not output image data according to the sensing of the timing controller 140 according to the present embodiments.

9, after the host system 500 receives the power-off signal according to the user's input and transmits the power-off signal to the timing controller 140, the timing controller 140 controls the timing of the off- The image data is not output during sensing.

In addition, the host system 500 receives the power-on signal according to the user's input and transmits the power-on signal to the timing controller 140, and then the timing controller 140 performs sensing in the on- And starts outputting the image data after receiving the sensing completion signal from the timing controller 140. [0050] FIG.

10 illustrates a driving method of the OLED display 100 according to the present embodiment.

10, the timing controller 140 of the OLED display 100 according to the present exemplary embodiment receives image data from the host system 500 when the OLED display 100 is driven (S1000 ).

The timing controller 140 converts the video data received from the host system 500 into a signal format used by the data driver 130 and outputs the converted video data to the data driver 130 to be supplied to the organic light emitting display panel 110 So that the image is displayed.

The timing controller 140 transmits a sensing start signal to the host system 500 (S1010) when sensing the characteristic value of a circuit element in the subpixel SP disposed in the organic light emitting display panel 110 ).

The timing controller 140 transmits a sensing start signal to the host system 500 to block the reception of the video data from the host system 500 at step S1030, .

The timing controller 140 stops the operation of processing the image data while receiving the image data from the host system 500 during the sensing period (S1040).

The timing controller 140 transmits the sensing completion signal to the host system 500 in step S1060 and transmits the sensing data from the host system 500 to the host system 500. [ (S1070).

At this time, when the timing controller 140 performs off-sensing, it may not receive image data even if it transmits a sensing completion signal.

The timing controller 140 performs processing on the image data received from the host system 500 (S1080), and displays the image on the organic light emitting display panel 110. [

According to the present embodiments, the timing controller 140 does not receive the image data from the host system 500 in the section for sensing the characteristic value of the circuit element in the sub-pixel SP, The noise due to the switching operation due to the video data reception and the video data processing is minimized.

By minimizing the noise generated in the sensing period, an error in the sensing data is prevented and a screen defect after compensation based on the sensing data is prevented from occurring.

Also, in the sensing period, the host system 500 does not output image data, and the timing controller 140 does not perform the switching operation for processing the image data, thereby reducing the power consumed during the sensing period.

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 and scope of the invention as defined by the appended claims. The embodiments of the present invention are not intended to limit the scope of the present invention but to limit the scope of the present invention.

100: organic light emitting display device 110: organic light emitting display panel
120: gate driver 130: data driver
140: timing controller 310: sensing unit
320: compensation unit 330: memory
500: Host system

Claims (10)

An organic light emitting display panel in which a plurality of gate lines and a plurality of data lines are arranged in an intersecting manner and a plurality of subpixels are arranged in an area where the gate lines and the data lines intersect;
A gate driver for driving the plurality of gate lines;
A data driver for driving the plurality of data lines; And
And a timing controller for controlling driving of the gate driver and the data driver,
The timing controller includes:
And does not receive the image data from the host system during a period of receiving image data from the host system and sensing a characteristic value of a circuit element included in the subpixel.
The method according to claim 1,
The timing controller includes:
And an image processing unit for converting the image data received from the host system into a signal format used in the data driver, wherein the image processing unit includes an organic light emitting unit that does not operate during a period of sensing a characteristic value of a circuit element included in the sub- Display device.
The method according to claim 1,
The timing controller includes:
And transmits a sensing start signal to the host system and does not receive the image data from the host system at a timing to start sensing the characteristic value of the circuit element included in the subpixel.
The method according to claim 1,
The timing controller includes:
And transmits the sensing completion signal to the host system and receives the image data from the host system when the sensing of the characteristic value of the circuit element included in the subpixel is completed.
5. The method of claim 4,
The timing controller includes:
When receiving a power-off signal from the host system and sensing a characteristic value of a circuit element included in the sub-pixel, transmitting a sensing completion signal to the host system when the characteristic value sensing of the circuit element included in the sub- And does not receive the image data from the host system.
And an organic light emitting diode (OLED) display panel including a plurality of subpixels arranged in a region where a plurality of gate lines and a plurality of data lines cross each other and the gate lines and the data lines cross each other,
A host system for outputting image data; And
Receiving the image data from the host system, converting the received image data into a signal format used by a data driver, and receiving the image data from the host system during a period of sensing a characteristic value of a circuit element included in the subpixel Timing controller
And an organic light emitting diode (OLED).
The method according to claim 6,
The timing controller includes:
A sensing start signal is transmitted to the host system at a timing at which the characteristic value sensing of the circuit element included in the sub pixel is started and a sensing completion signal is transmitted to the host system when the characteristic value sensing of the circuit element included in the sub pixel is completed To the organic light emitting display device.
8. The method of claim 7,
The host system includes:
And stops outputting the image data when receiving the sensing start signal from the timing controller and outputs the image data when receiving the sensing completion signal from the timing controller.
9. The method of claim 8,
The host system includes:
Off signal to the timing controller and does not output the image data when receiving the sensing completion signal from the timing controller.
A method of driving an OLED display device including an OLED display panel in which a plurality of gate lines and a plurality of data lines are crossed and a plurality of subpixels are arranged in a region where the gate lines and the data lines intersect,
Receiving image data from a host system;
Transmitting a sensing start signal to the host system at a timing of starting sensing of a characteristic value of a circuit element included in the subpixel, and transmitting image data from the host system during a period of sensing a characteristic value of a circuit element included in the subpixel Not receiving; And
Transmitting a sensing completion signal to the host system when sensing the characteristic value of the circuit element included in the sub-pixel, and receiving image data from the host system
And a driving method of the organic light emitting display device.

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