KR102467180B1 - Organic light emitting display device and method for driving the organic light emitting display device - Google Patents

Abstract

The present embodiments relate to an organic light emitting display device and a method of driving the organic light emitting display device, in which image data is not received from a host system in a section in which a timing controller of the organic light emitting display device senses a characteristic value of a circuit element in a subpixel. By not performing an operation to process the image data without performing the image data reception and processing noise in the sensing section, the accuracy of the sensing data is improved, and screen defects do not occur after compensation, and the power consumed during the sensing section is minimized. to be able to reduce

Description

Organic light emitting display device and method of driving the organic light emitting display device

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

An organic light emitting display device that has recently been in the limelight as a display device uses organic light emitting diodes (OLEDs) that emit light by itself, and thus has advantages of fast response speed, high contrast ratio, luminous efficiency, luminance, and viewing angle.

Such an organic light emitting display device includes an organic light emitting display panel including a plurality of subpixels in which a plurality of gate lines and a plurality of data lines are disposed and disposed in an area where the gate lines and the data lines intersect, and driving the plurality of gate lines. and a gate driver for driving a plurality of data lines, a data driver for driving a plurality of data lines, and a timing controller for controlling driving of the gate driver and the data driver, and each subpixel includes an organic light emitting diode (OLED) and an organic light emitting diode ) and a driving transistor that drives the

Circuit elements such as organic light emitting diodes (OLEDs) or driving transistors included in each subpixel each have their own characteristic values (e.g., threshold voltage, mobility, etc.) ) progresses and its characteristic value may change.

Depending on the change in the characteristic value of a circuit element, the luminance characteristics of a subpixel including the circuit element may be changed, and when the characteristic value or characteristic value change between circuit elements is different, a luminance deviation between subpixels is caused, thereby improving the luminance uniformity of the organic light emitting display panel. There is a problem in that the image quality deteriorates or an afterimage region occurs.

In order to solve this problem, a technology for sensing and compensating the characteristic values of circuit elements in each subpixel has been applied.

At this time, in sensing and compensating for the characteristic values of circuit elements in each subpixel, it is very important to accurately sense the characteristic values of each circuit element, but noise generated in the sensing section causes errors in the sensing data (Error Term). ) may be included.

When an error is included in the sensing data, since the deterioration of the circuit element is compensated for based on the sensing data including the error, the error in the sensing data is reflected in the compensation value and may appear as a screen defect after compensation.

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

An object of the present embodiments is to provide an organic light emitting display device and a driving method for minimizing noise generated in a section in which a characteristic value of a circuit element included in a subpixel of the organic light emitting display device is sensed.

An object of the present embodiments is to provide an organic light emitting display device and a driving method of the organic light emitting display device in which accuracy of sensing characteristic values of circuit elements included in subpixels of the device and compensation performance according to sensing are improved.

In one embodiment, an organic light emitting display panel in which a plurality of gate lines and a plurality of data lines intersect and a plurality of subpixels are disposed in an area where the gate lines and the data lines intersect, and a gate driving the plurality of gate lines. A driver, a data driver for driving a plurality of data lines, and a timing controller for controlling driving of the gate driver and the data driver, wherein the timing controller receives image data from a host system and controls circuit elements included in subpixels. An organic light emitting display device that does not receive image data from a host system during a characteristic value sensing period may be provided.

Another embodiment is an organic light emitting display device including an organic light emitting display panel in which a plurality of gate lines and a plurality of data lines intersect and a plurality of subpixels are arranged in an area where the gate lines and data lines intersect, The host system outputs image data, receives image data from the host system, converts the received image data into a signal format used by the data driver, and senses the characteristic values of circuit elements included in sub-pixels. An organic light emitting display device including a timing controller not receiving data may be provided.

Another embodiment is a method of driving an organic light emitting display device including an organic light emitting display panel in which a plurality of gate lines and a plurality of data lines intersect and a plurality of subpixels are disposed in an area where the gate lines and data lines intersect. In the step of receiving image data from the host system, at the timing of starting sensing of the characteristic values of the circuit elements included in the sub-pixels, a sensing start signal is transmitted to the host system and the characteristic values of the circuit elements included in the sub-pixels are sensed. and not receiving image data from the host system during a period of time during which the image data is received from the host system, and transmitting a sensing completion signal to the host system and receiving the image data from the host system when the sensing of the characteristic value of a circuit element included in the subpixel is completed. A driving method of a light emitting display device may be provided.

According to the present embodiments, image data input from a host system is blocked in a section where characteristic values of circuit elements included in subpixels of an organic light emitting display device are sensed, so that image data is received and received image data is processed. By minimizing generated noise, errors included in sensing data can be reduced.

According to the present embodiments, by improving the accuracy of sensing data for characteristic values of circuit elements included in subpixels of an organic light emitting display device, compensation performance for characteristic values of circuit elements is improved and screen defects do not occur after compensation. do.

According to the present embodiments, image data is not received and unnecessary switching is reduced so that noise is not generated in a section where characteristic values of circuit elements included in subpixels of the organic light emitting display device are sensed, thereby reducing power consumption. make it possible

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

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention are described in detail below with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, order, or number of the corresponding component is not limited by the term. When an element is described as being “connected,” “coupled to,” or “connected” to another element, that element is or may be directly connected to that other element, but intervenes between each element. It will be understood that may be "interposed", or each component may be "connected", "coupled" or "connected" through other components.

1 shows a schematic configuration of an organic light emitting display device 100 according to the present embodiments.

Referring to FIG. 1 , in an organic light emitting display device 100 according to the present embodiments, a plurality of gate lines GL and a plurality of data lines DL are disposed, and the gate lines GL and data lines DL An organic light emitting display panel 110 including a plurality of subpixels (SP) disposed in the crossing area, a gate driver 120 driving a plurality of gate lines (GL), and a plurality of data lines (DL). It includes a data driver 130 for supplying a data voltage, and a timing controller 140 (T-CON) for controlling 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 scan signals of an on voltage or an off voltage to the plurality of gate lines GL under the control of the timing controller 140 to generate the plurality of gate lines GL. run sequentially.

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

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

Each gate driver integrated circuit 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) method, or It can be implemented as a GIP (Gate In Panel) type and directly disposed on the organic light emitting display panel 110 .

In addition, it may be integrated and disposed on the organic light emitting display panel 110, or may be implemented in 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 a 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 them to the plurality of data lines DL, thereby providing a plurality of data lines DL. ) to drive

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 is connected to a bonding pad of the organic light emitting display panel 110 or to the organic light emitting display panel 110 by a tape automated bonding (TAB) method or a chip on glass (COG) method. It may be directly disposed or may be integrated and disposed on the organic light emitting display panel 110 .

In addition, each source driver integrated circuit may be implemented in a chip on film (COF) method. In this case, one end of each source driver integrated circuit is bonded to at least one source printed circuit board, and the other end is bonded to the organic light emitting display panel 110 .

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

The timing controller 140 starts scanning according to the timing implemented in each frame, converts externally input image data according to the data signal format used by the data driver 130, and outputs the converted image data. and controls data driving at an appropriate time according to the scan.

The timing controller 140 includes various timing signals including a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), an input data enable (DE) signal, and a clock signal (CLK) together with input image data. are received from outside (e.g. host system).

The timing controller 140 converts the input image data input from the outside to suit the data signal format used by the data driver 130 and outputs the converted image data, as well as the gate driver 120 and the data driver 130. ), receive timing signals such as the vertical sync signal (Vsync), the horizontal sync signal (Hsync), the input data enable signal (DE), and the clock signal (CLK), and generate various control signals to generate gate drivers (120) and the data driver (130).

For example, the timing controller 140 may include a gate start pulse (GSP), a gate shift clock (GSC), and a gate output enable signal (GOE) to control the gate driver 120 . : Gate Output Enable) and various gate control signals (GCS: Gate Control Signal) are output.

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 shift timing of scan signals (gate pulses). The gate output enable signal GOE specifies timing information of one or more gate driver integrated circuits.

In addition, the timing controller 140, in order to control the data driver 130, a source start pulse (SSP: Source Start Pulse), a source sampling clock (SSC: Source Sampling Clock), a source output enable signal (SOE: Source It outputs various data control signals (DCS: Data Control Signal) including Output Enable) and the like.

Here, the source start pulse SSP controls 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 that controls sampling timing of data in each source driver integrated circuit. The source output enable signal SOE controls output timing of the data driver 130 .

The timing controller 140 is a source printed circuit board bonded with a source driver integrated circuit and a control printed circuit connected through a connection medium such as a flexible flat cable (FFC) or a flexible printed circuit (FPC). It may be disposed on a board (Control Printed Circuit Board).

On such a control printed circuit board, a power controller (not shown) supplies various voltages or currents to the organic light emitting display panel 110, the gate driver 120, and the data driver 130 or controls various voltages or currents to be supplied. more can be placed. Such a power controller is also referred to as a power management integrated circuit.

Each subpixel SP disposed on 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 an organic light emitting diode (OLED) and a circuit element such as a driving transistor (DRT) for driving the organic light emitting diode (OLED). It can be.

The type and number of circuit elements constituting each sub-pixel SP may be variously determined according to a provided function and a design method.

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

Referring to FIG. 2 , in the organic light emitting display device 100 according to the present embodiments, each subpixel SP includes an organic light emitting diode OLED and a driving transistor DRT for driving the organic light emitting diode OLED. ) and a sensing transistor (SENT: Sensing Transistor) electrically connected between the first node (N1) of the driving transistor (DRT) and a reference voltage line (RVL) supplying a reference voltage (Vref: Reference Voltage). ), a switching transistor (SWT) electrically connected between the second node N2 of the driving transistor DRT and the data line DL supplying the data voltage Vdata, and the driving transistor DRT It is configured to include a storage capacitor (Cstg: Storage Capacitor) electrically connected between the first node N1 and the second node N2 of the .

An organic light emitting diode (OLED) may include a first electrode (eg, an anode electrode or a cathode electrode), an organic layer, and a second electrode (eg, a cathode electrode or an anode electrode).

The driving transistor DRT drives the organic light emitting diode OLED by supplying a driving current to 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 a source node or a 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) that supplies the 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.

Also, when the sensing transistor SENT is turned on, it may be used as a voltage sensing path for the first node N1 of the driving transistor DRT.

When turned on by the gate signal, 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.

In this case, the sensing transistor SENT and the switching transistor SWT may be connected to different gate lines GL to be separately controlled on-off or 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 to generate a data voltage Vdata corresponding to the image signal voltage or a voltage corresponding thereto. It can be maintained for one frame time.

Meanwhile, in the case of the organic light emitting display device 100 according to the present exemplary embodiments, as the driving time of each subpixel SP is increased, circuit elements such as an organic light emitting diode (OLED) and a driving transistor (DRT) Degradation may proceed.

Accordingly, inherent characteristic values (eg, threshold voltage, mobility, etc.) of circuit elements such as organic light emitting diodes (OLEDs) and driving transistors (DRTs) may change.

Such a change in the characteristic value of a circuit element causes a change in the luminance of the corresponding sub-pixel (SP), and the difference in the change in the characteristic value between the circuit elements due to the difference in the degree of deterioration between the circuit elements causes a luminance deviation between the sub-pixels (SP) and an organic light emitting display. This may cause deterioration in luminance uniformity of the panel 110 .

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

The organic light emitting display device 100 according to the present embodiments includes a sensing function for sensing a characteristic value variation between subpixels SP or a characteristic value deviation between subpixels SP and a sensing result to detect subpixel SPs. A compensation function for compensating for the characteristic value of may be provided.

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

Referring to FIG. 3 , the organic light emitting display device 100 according to the present embodiments includes a sensing unit 310, a compensating unit 320, a memory 330, a sensing unit 310, a compensating unit 320, a memory 330, A reference voltage switch (SPRE) and a sampling switch (SAMP) may be included.

The sensing unit 310 senses a voltage for sensing a characteristic value or change thereof of the subpixel SP, converts the sensed voltage into a digital value, and outputs sensing data including the converted sensing value. Here, the characteristic value of the subpixel (SP) means the threshold voltage and mobility of the driving transistor (DRT) or the threshold voltage of the organic light emitting diode (OLED), and the sensing data may be in the LVDS (Low Voltage Differential Signaling) data format. can

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

The compensating unit 320 performs a compensation process of compensating for characteristic value deviations between the sub-pixels SP by recognizing the characteristic values or changes thereof of the sub-pixels SP using the sensing data output by the sensing unit 310 .

The compensating unit 320 may be included inside the timing controller 140 or may be disposed outside the timing controller 140 in some cases.

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

The reference voltage switch SPRE controls whether or not to supply the reference voltage Vref to the reference voltage line RVL, and the sampling switch SAMP controls the reference voltage for sensing the characteristic value of the subpixel SP. A connection between the voltage line RVL and the sensing unit 310 is controlled.

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 turned-on sensing transistor SENT.

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 that may be equipotential with the first node N1 of the driving transistor DRT. The voltage of the voltage line RVL may also be in a voltage state reflecting the characteristic value of the subpixel SP. At this time, a voltage reflecting the characteristic value of the subpixel SP may be charged in the line capacitor formed on the reference voltage line RVL.

That is, when the sensing transistor SENT is turned on, the voltage of the first node N1 of the driving transistor DRT is the voltage of the reference voltage line RVL and the line formed on the reference voltage line RVL. The voltages charged in the capacitors 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 subpixel SP, the sampling switch SAMP is turned on, and the sensing unit 310 and the reference voltage line (RVL) can be connected.

Accordingly, the sensing unit 310 senses the voltage of the reference voltage line RVL, which is a voltage state reflecting the characteristic value of the subpixel SP. Here, the reference voltage line RVL may also 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.

In the case of sensing the threshold voltage of the driving transistor DRT, the voltage sensed by the sensing unit 310 may be a voltage value including the threshold voltage Vth or a change in the threshold voltage ΔVth of the driving transistor DRT.

Also, 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 sensing the mobility of the driving transistor DRT.

Also, the voltage sensed by the sensing unit 310 may be a voltage reflecting a threshold voltage, which is a characteristic value of the organic light emitting diode (OLED).

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

The compensation unit 320 determines the characteristic value or 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, and the characteristic value deviation. Performs a process that compensates for

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 for the mobility of the driving transistor DRT.

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

The mobility compensation process may include processing of calculating a compensation value for compensating for mobility or mobility deviation, storing the calculated compensation value in the memory 330, or changing corresponding image data with the calculated compensation value. can

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

Accordingly, the corresponding source driver integrated circuit converts the data changed in the compensation unit 320 into a data voltage through a digital to analog converter (DAC) and supplies it to the corresponding subpixel SP, so that the subpixel ( The compensation for the characteristic value of SP) can be made.

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

4 is a diagram illustrating sensing timing of the organic light emitting display device 100 according to the present exemplary embodiments.

Referring to FIG. 4 , in the organic light emitting display device 100 according to the present exemplary embodiments, after a power-off signal is generated according to a user input, each subpixel (SP) disposed on the organic light emitting display panel 110 A characteristic value of a circuit element may be sensed.

In this way, sensing performed after the power-off signal is generated is referred to as “off-sensing”.

In addition, in the organic light emitting display device 100 according to the present embodiments, after a power-on signal is generated according to a user input, etc., and before image driving starts, each sub-pixel disposed on the organic light emitting display panel 110 ( SP) can sense the characteristics of circuit elements.

In this way, sensing performed after the power-on signal is generated and before image driving is performed is referred to as “on-sensing”.

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

In this way, sensing performed during image driving is referred to as “real-time sensing”.

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

On the other hand, in the organic light emitting display device 100, in a section where the characteristic values of circuit elements included in the subpixels SP disposed on the organic light emitting display panel 110 are sensed, the timing controller 140 receives image data from the outside. and processing the received image data.

Noise may occur as the timing controller 140 receives image data from the outside and processes the received image data in a section where the characteristic values of the circuit elements included in the subpixel SP are sensed. may affect sensing data for characteristic values of circuit elements.

Therefore, an error may be included in the sensing data due to noise, and when compensation is performed based on the sensing data including the error, there is a problem in that a screen defect may be caused after the compensation.

The present embodiments provide a sensing driving method capable of sensing characteristic values of circuit elements included in a subpixel SP, performing compensation accordingly, and reducing noise generated in a section where characteristic values of circuit elements are sensed. do.

5 to 8 describe how the organic light emitting display device 100 operates in a section where characteristic values of circuit elements included in the subpixels SP of the organic light emitting display device 100 according to the present embodiments are sensed. It is a drawing for

5 to 8 , the organic light emitting display device 100 according to the present embodiments includes a host system 500 outputting image data displayed on an organic light emitting display panel 110 and a host system 500 It may include a timing controller 140 that receives the output image data, processes the received image data, and outputs the image data to the data driver 130 .

FIG. 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, etc. A power-on signal is transmitted to the timing controller 140 to drive the timing controller 140, and image data is output and transmitted to the timing controller 140.

Upon receiving 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.

In addition, the timing controller 140 controls the driving of the gate driver 120 so that the data driver 130 transmits data to each data line DL according to the driving timing of the gate line GL by the gate driver 120. An image is displayed on the organic light emitting display panel 110 by supplying voltage.

Meanwhile, the timing controller 140 senses characteristic values of circuit elements such as organic light emitting diodes (OLEDs) or driving transistors (DRTs) included in subpixels (SPs) disposed on the organic light emitting display panel 110, and senses Based on the obtained characteristic value, a compensation process for compensating for a characteristic value change or deviation due to deterioration of the circuit element is performed.

6 illustrates a step in which the timing controller 140 starts sensing characteristic values of circuit elements included in the sub-pixel SP, and FIG. 7 shows the timing controller 140 in the circuit elements included in the sub-pixel SP. It shows the step of performing sensing for the characteristic value of .

Referring to FIGS. 6 and 7 , the timing controller 140 transmits a sensing start signal to the host system 500 at the start timing of a period in which characteristic values of circuit elements are sensed.

The timing controller 140 transmits a sensing start signal and senses the characteristic values of circuit elements included in the subpixel SP, and the host system 500 receives the sensing start signal from the timing controller 140. , video data is not output to the timing controller 140 .

Accordingly, the timing controller 140 does not receive image data from the host system 500 during a period in which the characteristic value of the circuit element included in the subpixel SP is sensed.

At this time, the period in which the timing controller 140 senses the characteristic values of the circuit elements included in the sub-pixel SP is a period in which off-sensing is performed after the power-off signal is generated, or an on-sensing period in which the power-on signal is generated. It may be a section in which sensing is in progress.

When the timing controller 140 senses a characteristic value of a circuit element included in the subpixel SP through off-sensing, the host system ( 500) may not output image data.

Alternatively, the host system 500 may transmit a power-off signal to the timing controller 140 and not output image data to the timing controller 140 at the same time.

When the timing controller 140 senses a characteristic value of a circuit element included in the subpixel SP by on-sensing, the host system ( 500) may not output video data, but the host system 500 may not output video data to the timing controller 500 while transmitting a power-on signal.

That is, blocking image data output from the host system 500 during a period in which the timing controller 140 senses the characteristic values of the circuit elements included in the sub-pixel SP, the timing controller 140 blocks the image data output from the host system 500. ), or may be started according to a power-on signal or a 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) that processes image data received from the host system 500, and while not receiving image data from the host system 500, that is, subpixel During the period of sensing the characteristic values of the circuit elements included in (SP), the image processor stops processing the received image data.

Therefore, the timing controller 140 does not receive image data from the host system 500 during a period of sensing the characteristic values of circuit elements included in the subpixel SP, and the image processing unit processing the image data does not operate. Noise generated during a period of sensing characteristic values of circuit elements is minimized by reducing unnecessary switching.

The timing controller 140 may minimize an error included in the sensing data obtained as a result of sensing the characteristic value of the circuit element included in the subpixel SP by minimizing noise generated during the sensing period, and the error in the sensing data. By minimizing , screen defects due to compensation performed based on sensing data are prevented from occurring.

In addition, the host system 500 does not output image data to the timing controller 140 during the sensing period, and the timing controller 140 blocks switching according to the image data processing operation, thereby reducing power consumption. let it be

For example, when the timing controller 140 senses a characteristic value of a circuit element included in a sub-pixel (SP) during an on-sensing period, image data is transmitted for a time corresponding to the on-sensing period (eg, about 7 seconds). Power consumption can be reduced by not outputting it. When sensing is performed in the off-sensing period, power consumption is reduced by not outputting image data for the time corresponding to the off-sensing period (eg, about 6 minutes). can make it

Therefore, in the organic light emitting display device 100 according to the present embodiments, the host system 500 outputs image data during a period in which the timing controller 140 senses characteristic values of circuit elements included in the subpixel SP. Otherwise, the timing controller 140 does not process the image data, so that noise generated in the sensing period can be minimized to improve the reliability of the sensing data and at the same time reduce power consumed during the sensing period. do.

8 illustrates a step in which the timing controller 140 completes sensing the characteristic values of 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 sensing of the characteristic value of the circuit element included in the subpixel SP is completed.

When the host system 500 receives a sensing completion signal from the timing controller 140 while not outputting image data after receiving the sensing start signal from the timing controller 140, the host system 500 transmits image data to the timing controller 140. start printing out

At this time, when the timing controller 140 senses the characteristic value of the circuit element included in the subpixel SP in the on-sensing period, the host system 500 generates an image according to the sensing completion signal received from the timing controller 140. Data is output to the timing controller 140.

However, when the timing controller 140 senses the characteristic value of the circuit element included in the subpixel SP in the off-sensing period, the host system 500 transmits the power-off signal, so the timing controller ( 140) does not output image data even if it receives a sensing completion signal, and starts outputting image data when a new power-on signal is received from the outside.

When the sensing completion signal is transmitted to the host system 500, the timing controller 140 receives image data from the host system 500 and also performs an operation to process the image data.

Therefore, the timing controller 140 does not receive image data from the host system 500 and does not process the received image data during the period of sensing the characteristic values of the circuit elements included in the subpixel SP. , so that noise generated in the sensing section can be minimized.

Accordingly, screen defects are prevented from occurring after compensation by reducing errors in sensing data and improving accuracy of compensation, and the host system 500 stops outputting video data and the timing controller 140 stops processing video data during the sensing period. through which power consumption can be reduced.

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

Referring to FIG. 9 , after the host system 500 receives a power-off signal according to a user's input and transmits the power-off signal to the timing controller 140, the timing controller 140 controls the off-sensing period. Image data is not output while sensing is performed in .

In addition, after the host system 500 receives a power-on signal according to a user's input and transmits the power-on signal to the timing controller 140, the timing controller 140 performs sensing in an on-sensing period. image data is not output during this time, and after receiving the sensing completion signal from the timing controller 140, image data starts to be output.

10 illustrates a process of a driving method of the organic light emitting display device 100 according to the present embodiments.

Referring to FIG. 10 , the timing controller 140 of the organic light emitting display device 100 according to the present embodiments receives image data from the host system 500 when the organic light emitting display device 100 is driven (S1000). ).

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

The timing controller 140 transmits a sensing start signal to the host system 500 when it is a period in which the characteristic values of circuit elements within the sub-pixels (SP) disposed on the organic light emitting display panel 110 are sensed (S1010). ).

The timing controller 140 transmits a sensing start signal to the host system 500 to block reception of image data from the host system 500 (S1030), and the host system 500 sends the image data to the timing controller 140. does not output

The timing controller 140 stops processing the image data while not receiving the image data from the host system 500 during the sensing period (S1040).

When the sensing of the characteristic values of the circuit elements within the sub-pixel SP is completed (S1050), the timing controller 140 transmits a sensing completion signal to the host system 500 (S1060) and transmits image data from the host system 500. is received (S1070).

In this case, when the timing controller 140 performs off-sensing, image data may not be received even though the sensing completion signal is transmitted.

The timing controller 140 processes 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 image data from the host system 500 in a period of sensing characteristic values of circuit elements in the sub-pixel SP, and also processes the received image data. By stopping, noise caused by a switching operation according to image data reception and image data processing is minimized.

By minimizing noise generated in the sensing section, an error in sensing data is prevented and screen defects are prevented from occurring after compensation based on the sensing data.

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

The above description is merely illustrative of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention. Since the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to explain, the scope of the technical idea of the present invention is not limited by these embodiments.

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 intersect and a plurality of subpixels are disposed in an area where the gate lines and the data lines intersect;
a gate driver driving the plurality of gate lines;
a data driver driving the plurality of data lines; and
a timing controller including an image processor that controls driving of the gate driver and the data driver and converts image data received from a host system into a signal format used by the data driver;
The timing controller,
Image data is received from the host system, and a sensing start signal is transmitted to the host system at the timing when sensing of the characteristic value of a circuit element included in the subpixel is started after the power-on signal is transmitted to the timing controller, and the subpixel When the sensing of the characteristic values of circuit elements included in is completed, a sensing completion signal is transmitted to the host system so that the image data is not received from the host system during a period in which the characteristic values are sensed.
The organic light emitting display device of claim 1 , wherein the image processing unit does not operate during a period of sensing characteristic values of circuit elements included in the subpixels.
delete According to claim 1,
The host system,
The organic light emitting display device not outputting the image data to the timing controller when the sensing start signal is received from the timing controller.
According to claim 1,
The host system,
and outputting the image data to the timing controller when the sensing completion signal is received from the timing controller.
delete An organic light emitting display device including an organic light emitting display panel in which a plurality of gate lines and a plurality of data lines intersect and a plurality of subpixels are disposed in an area where the gate lines and the data lines intersect,
a host system that outputs image data; and
The image data is received from the host system, the received image data is converted into a signal format used by the data driver, and after receiving the power-on signal from the host system, the characteristic value sensing of the circuit element included in the subpixel is performed. At the starting timing, a sensing start signal is transmitted to the host system, and when the sensing of the characteristic value of the circuit element included in the subpixel is completed, a sensing completion signal is transmitted to the host system. A timing controller that stops an operation of processing the received video data without receiving video data.
An organic light emitting display device comprising a.
delete According to claim 6,
The host system,
The organic light emitting display device stops outputting the image data when the sensing start signal is received from the timing controller, and outputs the image data when the sensing completion signal is received from the timing controller.
delete A method of driving an organic light emitting display device including an organic light emitting display panel in which a plurality of gate lines and a plurality of data lines intersect and a plurality of subpixels are disposed in an area where the gate lines and the data lines intersect, the method comprising:
receiving image data from a host system;
After the host system transmits the power-on signal, a sensing start signal is transmitted to the host system at the timing at which the sensing of the characteristic value of the circuit element included in the subpixel is started, and the characteristic value of the circuit element included in the subpixel not receiving image data from the host system during a period of sensing ?;
stopping an operation of processing the received image data; and
Transmitting a sensing completion signal to the host system and receiving image data from the host system when the sensing of the characteristic value of the circuit element included in the subpixel is completed.
A method of driving an organic light emitting display device comprising:

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