KR20160078867A - Organic light emitting display panel and organic light emitting display device - Google Patents

Abstract

Embodiments of the present invention relate to an organic light emitting display panel and an organic light emitting display apparatus, configured to provide potential stability of a reference voltage line, playing a role as a sensing line, during a sensing operation and be able to enhance sensing accuracy and compensation accuracy. According to the present invention, the organic light emitting display apparatus comprises: the organic light emitting display panel; a data operation unit; a gate operation unit; and a timing controller.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting display panel and an organic light emitting display device,

The present embodiments relate to an organic light emitting display panel and an organic light emitting display.

2. Description of the Related Art In recent years, an organic light emitting diode (OLED) display device that has been spotlighted as a display device has a high response speed and an excellent contrast ratio, luminous efficiency, luminance, and viewing angle by using an organic light emitting diode (OLED) There are advantages.

Each of the sub-pixels arranged in the organic light emitting display panel of the organic light emitting display device is basically composed of a driving transistor for driving the organic light emitting diode, a switching transistor for transmitting the data voltage to the gate node of the driving transistor, And a capacitor that serves to maintain the capacitor.

On the other hand, the driving transistors in each sub-pixel have characteristic values such as a threshold voltage and a mobility, and these characteristic values may be different for each driving transistor.

In addition, the driving transistor may be degraded as the driving time becomes longer, and the characteristic value may vary. Even if the driving time is the same, there may be a difference in degree of deterioration between the driving transistors, have.

The deviation of the characteristic values between the driving transistors generates a luminance variation, causing non-uniformity of luminance of the OLED display panel.

Accordingly, a technique has been developed that senses the characteristic value of the driving transistor and compensates for the characteristic value deviation. However, in spite of the compensation of the characteristic value deviation for the driving transistor, the variation in the sensing value with respect to the characteristic value for the driving transistor occurs for some reason, and the sensing accuracy is lowered. As a result, Compensation) has not been achieved. As a result, such a problem has resulted in poor image quality.

It is an object of the present embodiments to provide an organic light emitting display device and an organic light emitting display panel thereof that can accurately compensate a driving transistor by increasing the sensing accuracy with respect to a characteristic value thereof.

It is another object of the present embodiments to provide an organic light emitting display device and an organic light emitting display panel having a sensing driving stabilization configuration capable of improving sensing accuracy with respect to a characteristic value of a driving transistor.

Another object of the present invention is to provide an OLED display device having a sensing driving stabilization configuration capable of improving sensing accuracy and compensation accuracy by providing potential stability of a reference voltage line serving as a sensing line during sensing driving, To provide a display panel.

One embodiment includes an organic light emitting display panel in which a plurality of data lines and a plurality of gate lines are arranged and in which a plurality of subpixels are arranged, a data driver driving a plurality of data lines, a gate driving a plurality of gate lines And a timing controller for controlling the data driver and the gate driver.

Each of the plurality of subpixels includes an organic light emitting diode, a driving transistor for driving the organic light emitting diode, a sensing transistor electrically connected between the first node of the driving transistor and the reference voltage line, A switching transistor electrically connected between the second node of the transistor and the data line, and a storage capacitor electrically connected between the first node and the second node of the driving transistor.

The organic light emitting display may further include a stabilization capacitor electrically connected to or disconnected from the reference voltage line according to the driving mode.

The stabilization capacitor may be electrically connected to the reference voltage line during a sensing driving mode period and may not be connected to a reference voltage line during a display driving mode period.

The stabilization capacitor may be disposed on the organic light emitting display panel or may be disposed outside the organic light emitting display panel.

Another embodiment can provide an organic light emitting display panel including a plurality of data lines and a plurality of gate lines arranged in a direction crossing each other and a plurality of subpixels arranged in a matrix type.

Each of the plurality of subpixels includes an organic light emitting diode, a driving transistor for driving the organic light emitting diode, a sensing transistor electrically connected between the first node of the driving transistor and the reference voltage line, A switching transistor electrically connected between the second node of the transistor and the data line, and a storage capacitor electrically connected between the first node and the second node of the driving transistor.

The organic light emitting display panel may further include a stabilization capacitor electrically connected to or disconnected from the reference voltage line according to the driving mode.

According to the exemplary embodiments of the present invention described above, it is possible to provide an organic light emitting display device and an organic light emitting display panel thereof, which can accurately compensate a driving transistor by increasing sensing accuracy with respect to a characteristic value thereof.

According to the embodiments, it is possible to provide an organic light emitting display device and an organic light emitting display panel having a sensing driving stabilization configuration that can improve the sensing accuracy with respect to the characteristic value of the driving transistor.

According to the embodiments, an OLED display device having a sensing driving stabilization configuration capable of improving sensing accuracy and compensation accuracy by providing potential stability of a reference voltage line serving as a sensing line during sensing driving, Can be provided.

1 is a schematic system configuration diagram of an organic light emitting display according to the present embodiments.
FIG. 2 is a diagram illustrating an example of a sub-pixel circuit of an OLED display according to an embodiment of the present invention. Referring to FIG.
3 is another example of a subpixel circuit of an organic light emitting display according to the present embodiments.
4 is a diagram illustrating a subpixel circuit and a compensation structure of an OLED display according to an exemplary embodiment of the present invention.
FIGS. 5 to 7 are views illustrating a sensing driving operation of the OLED display according to the exemplary embodiments of the present invention.
FIG. 8 is a diagram illustrating a sensing driving stabilization configuration of the OLED display according to the present embodiments. Referring to FIG.
9 is a diagram illustrating a state of the sensing driving stabilization configuration in the sensing driving operation of the organic light emitting display according to the present embodiments.
10 is a diagram illustrating a state of the sensing driving stabilization configuration in the display driving operation of the organic light emitting diode display according to the present embodiments.
FIGS. 11 and 12 are views illustrating the structure of sensing and driving stabilization of the organic light emitting display according to the present embodiments on an organic light emitting display panel.
FIG. 13 is an exemplary view illustrating a sensing driving stabilization configuration of the OLED display according to the present embodiments implemented on a flexible printed circuit.
FIG. 14 is a timing diagram of the switching elements in the sensing driving stabilization configuration of the organic light emitting display according to the present embodiments.
15 is another timing diagram of the switching device in the sensing driving stabilization configuration of the OLED display according to the present embodiments.

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

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

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

1, the OLED display 100 includes an OLED display panel 110, a data driver 120, a gate driver 130, a timing controller 140, and the like .

In the OLED display panel 110, a plurality of data lines and a plurality of gate lines may be arranged in a direction crossing each other.

In addition, a plurality of sub pixels may be arranged in a matrix type in the organic light emitting display panel 110.

The data driver 120 supplies data voltages to a plurality of data lines to drive a plurality of data lines.

The gate driver 130 sequentially supplies the scan signals to the plurality of gate lines to sequentially drive the plurality of gate lines.

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

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

Under the control of the timing controller 140, the gate driver 130 sequentially supplies the scan signals of the On voltage or the Off voltage to the plurality of gate lines to sequentially drive the plurality of gate lines .

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

In addition, the gate driver 130 may include one or more gate driver integrated circuits (GDICs). 1, five gate driver integrated circuits (GDIC # 1, ..., GDIC # 5) are shown for convenience of explanation.

Each of the gate driver ICs GDIC # 1, ..., and GDIC # 5 is connected to the organic light emitting display panel 110 in a Tape Automated Bonding (TAB) or chip on glass (COG) Or a GIP (Gate In Panel) type and may be directly disposed on the organic light emitting display panel 110. In some cases, the organic light emitting display panel 110 may be integrated with the organic light emitting display panel 110, .

Each of the gate driver integrated circuits GDIC # 1, ..., GDIC # 8 may include a shift register, a level shifter, an output buffer, and the like.

When the specific gate line is opened, the data driver 120 converts the image data received from the timing controller 140 into analog data voltages and supplies the data voltages to the data lines to drive the plurality of data lines.

The data driver 120 may include one or more source driver integrated circuits (SDICs) (also referred to as data driver ICs). 1, eight source driver integrated circuits (SDIC # 1, ..., SDIC # 8) are shown for convenience of explanation.

Each of the source driver ICs (SDIC # 1, ..., SDIC # 8) is connected to the organic light emitting display panel 110 by tape automation bonding (TAB) or chip on glass (COG) (Bonding Pad), directly disposed on the organic light emitting display panel 110, and may be integrated on the organic light emitting display panel 110, as the case may be.

Also, each of the source driver integrated circuits (SDIC # 1, ..., SDIC # 8) can be implemented by a chip on film (COF) method. One end of each source driver integrated circuit (SDIC # 1, ..., SDIC # 8) is bonded to a source printed circuit board (160) and the other end thereof is connected to the organic light emitting display panel Bonding.

 Each of the source driver ICs (SDIC # 1, ..., SDIC # 8) includes a shift register, a latch, a digital analog converter (DAC), an output buffer, And an analog digital converter (ADC) for sensing the analog voltage value to convert the analog voltage value into a digital value and generating and outputting sensing data.

On the other hand, the timing controller 140 outputs a vertical synchronizing signal Vsync, a horizontal synchronizing signal Hsync, an input data enable (DE) signal, a clock signal CLK, And the like.

The timing controller 140 may control the data driving unit 120 and the gate driving unit 130 in addition to outputting the converted video data by switching the video data inputted from the outside according to the data signal format used by the data driving unit 120, The data driver 120 and the gate driver 130 generate various control signals by receiving timing signals such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, an input DE signal, and a clock signal, .

For example, in order to control the gate driver 130, the timing controller 140 generates a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal GOE : Gate Output Enable), and the like. The gate start pulse GSP controls the operation start timing of one or more gate driver ICs GDIC # 1, ..., GDIC # 5 constituting the gate driver 130. The gate shift clock GSC is a clock signal commonly input to one or more gate driver ICs GDIC # 1, ..., GDIC # 5, and controls the shift timing of the scan signal (gate pulse). The gate output enable signal GOE specifies timing information of one or more gate driver ICs (GDIC # 1, ..., GDIC # 5).

The timing controller 140 controls the data driver 120 such that a source start pulse SSP, a source sampling clock SSC, a source output enable signal SOE, (DCS: Data Control Signal) including a data signal The source start pulse SSP controls the data sampling start timing of one or more source driver integrated circuits (SDIC # 1, ..., SDIC # 8) constituting the data driver 120. The source sampling clock SSC is a clock signal for controlling sampling timing of data in each of the source driver integrated circuits (SDIC # 1, ..., SDIC # 8). The source output enable signal SOE controls the output timing of the data driver 120.

1, the timing controller 140 includes a source printed circuit board 160 to which source driver integrated circuits (SDIC # 1 to SDIC # 8) are bonded, a flexible flat cable (FFC) Or a control printed circuit board 180 connected via a connection medium 170 such as a flexible printed circuit (FPC).

The control printed circuit board 180 includes a power controller 150 for controlling various voltages or currents to supply or supply various voltages or currents to the organic light emitting display panel 110, the data driver 120, the gate driver 130, Can be further disposed. These power controllers are also referred to as power management ICs (PMICs).

1, only one source printed circuit board 160 is shown, but this is only an embodiment, in which the gate driver integrated circuits are disposed on both sides of the display panel 110, or the number of the source driver integrated circuits is increased There may be more than one source printed circuit board 160. In this case,

In FIG. 1, the source printed circuit board 160 and the control printed circuit board 180 are separately formed, but this is an embodiment, and may be implemented as one printed circuit board.

In each subpixel SP disposed in the organic light emitting display panel 110 shown in FIG. 1, a circuit element such as a transistor or a capacitor is formed. For example, a circuit including an organic light emitting diode (OLED), two or more transistors, and one or more capacitors is formed in each subpixel on the organic light emitting display panel 110.

Hereinafter, with reference to FIG. 2 and FIG. 3, a subpixel circuit is exemplarily described.

2 is an exemplary view of a sub-pixel circuit of the organic light emitting diode display 100 according to the present embodiments.

Referring to FIG. 2, in the organic light emitting diode display 100 according to the present embodiment, each sub-pixel includes an organic light emitting diode (OLED) and a driving circuit for driving the organic light emitting diode (OLED).

2, the driving circuit basically includes two transistors (a driving transistor (DRT), a switching transistor (SWT), and a storage capacitor (Cstg: Storage Capacitor)) and a capacitor Lt; / RTI >

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

For example, in the organic light emitting diode OLED, a first node (N1 node, for example, a source node or a drain node) of the driving transistor DRT is electrically connected to the first electrode, and a low voltage EVSS ) May be applied.

Referring to FIG. 2, the driving transistor DRT is a transistor for supplying driving current to the organic light emitting diode OLED to drive the organic light emitting diode OLED.

The driving transistor DRT includes a first node N1 node corresponding to a source node or a drain node, a second node N2 node corresponding to a gate node, a third node N3 corresponding to a drain node or a source node, (N3 node). The driving transistor DRT may be an N-type transistor or a P-type transistor.

For example, in this driving transistor DRT, the N1 node may be electrically connected to the first electrode or the second electrode of the organic light emitting diode OLED, and the N3 node may be connected to the driving voltage line DVL < / RTI >

Referring to FIG. 2, the switching transistor SWT is a transistor for transferring a data voltage (Vdata) to an N2 node corresponding to a gate node of the driving transistor DRT.

This switching transistor SWT is controlled by the scan signal SCAN applied to the gate node and is electrically connected between the node N2 of the driving transistor DRT and the data line DL.

Referring to FIG. 2, a storage capacitor Cstg may be electrically connected between the node N1 and the node N2 of the driving transistor DRT.

The storage capacitor Cstg serves to maintain a constant voltage for one frame time.

The structure of the subpixel illustrated in FIG. 2 is the most basic 2T1C structure composed of two transistors (DRT, SWT), one capacitor (Cstg), and one organic light emitting diode (OELD).

On the other hand, the subpixel structure can be variously modified according to various design purposes for improving image quality.

For example, the subpixel may have a compensation structure for compensating the intrinsic characteristic values such as the threshold voltage (Vth) and mobility of the driving transistor (DRT). The compensation structure may be of various types, and may be determined in consideration of the type of the driving transistor DRT, the size and resolution of the organic light emitting display panel 110, and the like.

In the present specification, the term " compensation "refers to compensating the characteristic value of the driving transistor DRT, which is equivalent to compensating the luminance of the subpixel. This is equivalent to compensating and compensating for luminance deviation between subpixels.

3 is another example of the subpixel circuit of the organic light emitting diode display 100 according to the present embodiments.

Referring to FIG. 3, in the OLED display 100 according to the present embodiment, each sub-pixel is composed of an organic light emitting diode (OLED) and a driving circuit.

3, a sub-pixel driving circuit having a compensation structure includes three transistors (a driving transistor (DRT), a switching transistor (SWT), a sensing transistor (SENT) And one capacitor (storage capacitor Cstg: Storage Capacitor).

Thus, a subpixel including three transistors (DRT, SWT, SENT) and one capacitor (Cstg) has a "3T1C structure".

Referring to FIG. 3, the organic light emitting diode OLED includes a first electrode (e.g., an anode electrode or a cathode electrode), an organic layer, and a second electrode (e.g., a cathode electrode or an anode electrode).

For example, in the organic light emitting diode OLED, a source node or a drain node of the driving transistor DRT may be connected to the first electrode, and a ground voltage (EVSS) may be applied to the second electrode.

Referring to FIG. 3, the driving transistor DRT is a transistor for supplying a driving current to the organic light emitting diode (OLED) to drive the organic light emitting diode (OLED).

The driving transistor DRT includes a first node N1 node corresponding to a source node or a drain node, a second node N2 node corresponding to a gate node, a third node N2 corresponding to a drain node or a source node, N3 node). Hereinafter, for convenience of explanation, the N1 node may be referred to as a source node, the N2 node as a gate node, and the N3 node as a drain node.

For example, in this driving transistor DRT, the N1 node may be electrically connected to the first electrode or the second electrode of the organic light emitting diode OLED, and the N3 node may be connected to the driving voltage line DVL < / RTI >

Referring to FIG. 3, the switching transistor SWT is a transistor for transmitting a data voltage (Vdata) to an N2 node corresponding to a gate node of the driving transistor DRT.

This switching transistor SWT is controlled by the scan signal SCAN applied to the gate node and is electrically connected between the node N2 of the driving transistor DRT and the data line DL.

Referring to FIG. 3, a storage capacitor Cstg may be electrically connected between an N1 node and an N2 node of the driving transistor DRT.

The storage capacitor Cstg serves to maintain a constant voltage for one frame time.

3, the sensing transistor SENT newly added to the basic subpixel structure of FIG. 2 is controlled by a sense signal SENSE, which is a kind of a scan signal applied to a gate node, (RVL: Reference Voltage Line) and the N1 node of the driving transistor DRT.

This sensing transistor SENT is turned on to apply the reference voltage Vref supplied through the reference voltage line RVL to the N1 node (e.g., the source node or the drain node) of the driving transistor DRT .

The sensing transistor SENT serves to allow the voltage of the node N1 of the driving transistor DRT to be sensed by an analog-to-digital converter (ADC) electrically connected to the reference voltage line RVL.

The role of the sensing transistor SETN is related to the compensation function for the characteristic value of the driving transistor DRT. Here, the inherent characteristic value of the driving transistor DRT may include, for example, a threshold voltage (Vth), a mobility, and the like.

In this regard, if a deviation of the intrinsic property value (threshold voltage, mobility) between the driving transistors DRT in each sub-pixel occurs, a luminance variation occurs between the sub-pixels and the image quality may be deteriorated.

Therefore, the intrinsic property values (threshold voltage, mobility) of the driving transistors DRT in each sub-pixel are sensed to compensate intrinsic property values (threshold voltage, mobility) between the driving transistors DRT, .

The voltage Vs of the source node N1 node of the driving transistor DRT follows the voltage Vg of the gate node N2 node And the voltage of the source node (N1 node) of the driving transistor DRT is set to a voltage of the source node N1 node of the driving transistor DRT Sensing as a sensing voltage. At this time, the threshold voltage variation of the driving transistor DRT can be grasped based on the sensed sensing voltage.

A description will now be briefly made of the principle of the mobility sensing for the driving transistor DRT. In order to define the current capability characteristic excluding the threshold voltage Vth of the driving transistor DRT, N2 node).

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

The mobility compensation through the above-described mobility sensing can be performed by allocating a predetermined time during the screen driving. By doing so, the parameters of the driving transistor DRT varying in real time can be sensed and compensated.

On the other hand, the gate node of the switching transistor SWT and the gate node of the sensing transistor SENT may be electrically connected to the same gate line.

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

The gate node of the switching transistor SWT and the gate node of the sensing transistor SENT are electrically connected to different gate lines so that the scan signal SCAN and the sense signal SENSE may be separately applied.

FIG. 4 is a diagram illustrating a subpixel circuit and a compensation structure of the organic light emitting diode display 100 according to the embodiments (a sensing structure for threshold voltage compensation and mobility compensation).

The subpixel circuit shown in Fig. 4 is the same as the subpixel circuit of Fig.

4, the OLED display 100 senses the voltage of the reference voltage line RVL, converts the sensed voltage into a digital value to generate sensing data, and outputs the sensed data to a timing controller 140 to an analog to digital converter (ADC).

Using such an analog-to-digital converter (ADC), the timing controller 140 may be capable of computing compensation values and performing data compensation on a digital basis.

Such an analog-to-digital converter (ADC) may be included in each source driver integrated circuit (SDIC) together with a digital-to-analog converter (DAC) that converts the image data to a data voltage (Vdata).

Referring to FIG. 4, the organic light emitting diode display 100 may include a switch structure such as a first switch SW1 and a second switch SW2 in order to effectively provide a sensing operation.

The first switch SW1 may connect between the reference voltage line RVL and the supply node Nref of the reference voltage Vref in accordance with the first switching signal.

When the first switch SW1 is turned on, the reference voltage Vref is supplied to the reference voltage line RVL. When the first switch SW1 is turned off, the reference voltage Vref is applied to the reference voltage line RVL Not supplied.

The second switch SW2 can connect the reference voltage line RVL and the analog-to-digital converter ADC according to the second switching signal (sampling signal).

When the second switch SW2 is turned on, the reference voltage line RVL and the analog-to-digital converter ADC are connected so that the analog-to-digital converter ADC can sense the voltage of the reference voltage line RVL.

The organic light emitting diode display 100 can make the voltage state of the main node (N1 node, N2 node) necessary for sensing driving through the switch constructions SW1 and SW2 described above, Sensing can be enabled.

5 to 7 are views showing the sensing driving operation of the OLED display 100 and the voltage waveform of the N1 node according to the present embodiments. However, the sensing operation for compensating the threshold voltage will be described by way of example.

5 to 7, the sensing driving operation of the organic light emitting diode display 100 according to the exemplary embodiments of the present invention may be performed in an initialization step S10, a voltage boosting step S20, and a sensing step S30 have.

Referring to FIG. 5, the initializing step S10 initializes the N1 node and the N2 node of the driving transistor DRT to a constant voltage.

5, in the initialization step S10, the switching transistor SWT and the sensing transistor SENT are in a turned-on state, the first switch SW1 is in an on state, the second switch SW2 is in an off state to be.

Thus, the reference voltage Vref supplied to the reference voltage line RVL is applied to the node N1 of the driving transistor DRT through the sensing transistor SENT.

Therefore, the N1 node of the driving transistor DRT is initialized to the reference voltage Vref.

The data voltage Vdata converted to the analog voltage value in the digital-analog converter DAC of the source driver integrated circuit is applied to the node N2 of the driving transistor DRT through the switching transistor SWT.

Therefore, the node N2 of the driving transistor DRT is initialized to the data voltage Vdata.

Referring to FIG. 6, the voltage boosting step S20 is a step of boosting the voltage of the N1 node of the driving transistor DRT.

Referring to FIG. 6, in the voltage boosting step S20, the first switch SW1 is in an OFF state and the second switch SW2 is in an OFF state.

As the first switch SW2 is turned off, the reference voltage Vref is not applied to the node N1 of the driving transistor DRT. That is, the node N1 of the driving transistor DRT is floated.

Therefore, in the voltage boosting step S20, as shown in the N1 voltage waveform diagram, the voltage of the N1 node of the driving transistor DRT is boosted.

The voltage rise of the node N1 of the driving transistor DRT is performed until the voltage Vdata of the node N2 of the driving transistor DRT is different from the voltage Vth by a predetermined voltage Vth.

That is, the voltage of the N1 node of the driving transistor DRT becomes equal to the voltage value Vdata-Vth obtained by subtracting the threshold voltage Vth of the driving transistor DRT from the voltage Vdata of the N2 node of the driving transistor DRT And saturation.

After the voltage of the node N1 of the driving transistor DRT is saturated, the voltage of the node N1 of the driving transistor DRT is sensed in order to sense the threshold voltage Vth of the driving transistor DRT. can do.

That is, after the voltage of the node N1 of the driving transistor DRT is saturated, the sensing step S30 may proceed.

Referring to FIG. 7, in the sensing step S30, the first switch SW1 is in the OFF state and the second switch SW2 is in the ON state. Further, in the sensing step S30, the sensing transistor SENT maintains the turn-on state.

Referring to FIG. 7, according to the ON state of the second switch SW2, the analog-to-digital converter ADC is connected to the reference voltage line RVL to sample and sense the voltage of the reference voltage line RVL .

At this time, the voltage (Vsense) sensed by the analog-to-digital converter (ADC) may be the saturated voltage of the N1 node (e.g., the source node or the drain node) of the driving transistor DRT.

The voltage Vsense sensed by the analog digital converter ADC corresponds to a voltage value obtained by subtracting the threshold voltage Vth of the driving transistor DRT from the data voltage Vdata .

Therefore, the threshold voltage (Vth) of the driving transistor (DRT) of each subpixel can be grasped based on the voltage (Vsense) sensed by the analog digital converter (ADC) and the threshold voltage deviation between the driving transistors .

The analog-to-digital converter (ADC) converts the sensed voltage (Vsense) into a digital value to generate sensing data and transmits it to the timing controller (140).

The timing controller 140 receives the sensing data, determines the threshold voltage deviation, and determines and stores a data compensation value for each subpixel to compensate for the threshold voltage deviation.

The timing controller 140 changes image data based on the data compensation value and transmits the image data to the corresponding source driver integrated circuit. Accordingly, the source driver integrated circuit can convert the changed image data into a data voltage using a digital-to-analog converter (DAC), and output the data voltage to the corresponding data line. In this way, substantial compensation is performed.

On the other hand, a parasitic capacitance component may exist in the transistors and various signal lines on the organic light emitting display panel 110. Such a parasitic capacitance component may cause an RC (Resistance Capacitance) load.

The generation of the RC rod according to the parasitic capacitance component can cause a phenomenon that the voltage characteristic becomes unstable during the sensing operation, that is, the voltage value to be sensed is shaken, and thus the sensing accuracy can be significantly lowered.

Due to such a reduction in the sensing accuracy, the timing controller 140 can obtain a wrong compensation value when calculating the compensation value. Therefore, despite the compensation for the improvement in the luminance deviation, the image quality may be rather deteriorated.

Accordingly, the present embodiments provide a sensing driving stabilization method for preventing a phenomenon in which a variation in sensing value occurs during sensing operation due to potential instability, thereby causing an error in a compensation value.

8 is a diagram illustrating a sensing driving stabilization configuration of the OLED display 100 according to the present embodiments. 9 is a diagram showing a state of the sensing driving stabilization configuration in the sensing driving operation of the organic light emitting diode display 100 according to the present embodiments. 10 is a diagram showing a state of the sensing drive stabilization configuration in the display driving operation of the organic light emitting diode display 100 according to the present embodiments.

Referring to FIG. 8, the organic light emitting display 100 according to the present embodiment is a sensing driving stabilization for preventing a phenomenon in which a variation in sensing value occurs during sensing operation to cause an error in a compensation value, And may further include a stabilization capacitor Cs, which may be electrically connected or disconnected from the reference voltage line RVL, depending on the mode.

9, the stabilization capacitor Cs is electrically connected to the reference voltage line RVL when the driving mode is the sensing driving mode, and the driving mode is the common driving mode (i.e., the display driving mode) , It is not electrically connected to the reference voltage line RVL, as shown in Fig.

The stabilization capacitor Cs is connected to the reference voltage line RVL in the sensing driving mode period, that is, in the sensing operation, thereby stabilizing the potential variation of the reference voltage line RVL.

On the other hand, the reference voltage line RVL allows a current to flow through the driving transistor DRT of each sub-pixel in the sensing operation. The current flowing through the reference voltage line RVL charges the entire capacitor in the reference voltage line RVL and raises the voltage of the reference voltage line RVL. This voltage increase is a phenomenon occurring in the voltage boosting step S20.

At this time, the voltage rising rate can be determined according to the total capacitance of the reference voltage line RVL. Therefore, when the total capacitance of the reference voltage line RVL is increased due to the addition of the stabilizing capacitor Cs, the voltage rising speed is increased and the sensing can be performed more quickly.

The sensing voltage of the reference voltage line RVL is set to a desired voltage component without any other unnecessary voltage components (e.g., EVDD, EVSS, etc.) because the current is hardly flowed through the driving transistor DRT near the sensing end. (E.g., Vdata-Vth). The desired voltage component can more accurately reflect the characteristic value (e.g., Vth) of the driving transistor DRT.

As described above, the stabilization capacitor Cs is electrically connected to the reference voltage line RVL in the sensing driving mode period, and is not connected to the reference voltage line RVL in the display driving mode period.

As described above, the stabilizing capacitor Cs is connected to the reference voltage line RVL only during the sensing driving mode period, thereby stabilizing the potential of the reference voltage line RVL during the sensing driving time, thereby improving the accuracy of the sensing value Thus, it is possible to obtain an accurate compensation value, thereby improving the image quality.

8, in order to control the stabilization capacitor Cs to be connected to or not connected to the reference voltage line RVL according to the driving mode, as described above, The switching device 100 may further include a switching element SWs for electrically connecting the reference voltage line RVL and the stabilization capacitor Cs only during sensing operation according to the switching control signal SWCS.

Through this switching element SWs, efficient connection control to the stabilization capacitor Cs to the reference voltage line RVL can be performed according to the driving mode.

The stabilizing capacitor Cs which can be additionally connected to the reference voltage line RVL during sensing operation may be disposed on the organic light emitting display panel 110 or on the outside of the organic light emitting display panel 110 It is possible.

If the stabilizing capacitor Cs is disposed on the organic light emitting display panel 110, the stabilizing capacitor Cs can be formed together with other patterns in the manufacturing process of the organic light emitting display panel 110, There is an advantage that the stabilized capacitor Cs can be implemented without the process of FIG.

In contrast, when the stabilizing capacitor Cs is disposed outside the organic light emitting display panel 110, for example, in a case where the stabilizing capacitor Cs is disposed on a film such as a flexible printed circuit (FPC) on which a source driver integrated circuit is disposed , The efficiency of the sensing operation by the analog-to-digital converter (ADC) corresponding to the sensing configuration included in the source driver integrated circuit is enhanced, and the sensing distance is shortened to improve the sensing accuracy to some extent. Here, a source driver integrated circuit disposed on a film such as a flexible printed circuit (FPC) is referred to as a COF (Chip On Film) type source driver integrated circuit.

The switching element SWs described above is controlled according to the switching control signal SWCS applied to the gate node and is electrically connected between the reference voltage line RVL and the first plate Plate of the stabilization capacitor Cs Transistor.

When such a switching element SWs is utilized, the connection between the reference voltage line RVL and the stabilization capacitor Cs can be more effectively controlled.

The stabilization capacitor Cs may be disposed on the organic light emitting display panel 110 or may be disposed outside the organic light emitting display panel 110. [

Hereinafter, when the stabilization capacitor Cs is disposed on the organic light emitting display panel 110, an implementation method of the stabilization capacitor Cs will be exemplarily described with reference to FIGS. 11 and 12. FIG. As an example of the case where the stabilization capacitor Cs is disposed outside the organic light emitting display panel 110, an implementation method of the stabilization capacitor Cs in the case where the stabilization capacitor Cs is disposed in the flexible printed circuit (FPC) Will be described with reference to the accompanying drawings.

FIGS. 11 and 12 illustrate examples of implementing the sensing driving stabilization configuration of the OLED display 100 according to the present embodiments on the organic light emitting display panel 110. FIG. However, in Fig. 12, the switching element SWs is exemplified as a coplanar TFT. However, the present invention is not limited thereto, and can be implemented with transistors having various structures.

11 and 12, when various patterns (transistors, capacitors, voltage lines, etc.) are formed on the organic light emitting display panel 110 in the manufacturing process of the organic light emitting display panel 110, The capacitor Cs and the switching element SWs can be formed together.

11 and 12, when the stabilization capacitor Cs and the switching element SWs are disposed in the OLED panel 110, a switching control signal SWCS is applied to the gate node of the switching element SWs, A gate wiring 1110 for applying a voltage to the organic light emitting display panel 110 may be further disposed.

In this manner, a further gate line 1110 is further disposed in the organic light emitting display panel 110 to apply a switching control signal (SWCS) to the gate node of the switching device SWs, The switching operation of the element SWs can be controlled efficiently.

The above-mentioned switching control signal SWCS may be output as a gate control signal GCS in the gate driver 130, for example.

11 and 12, the switching element SWs may have an Na node, an Nb node, and an Nc node, and the Na node of the switching element SWs may be a drain node or a source node, RVL and the Nb node of the switching element SWs is electrically connected to the first plate P1 of the stabilizing capacitor Cs as a source node or a drain node.

11 and 12, the stabilization capacitor Cs may be formed by the first plate P1 and the second plate P2.

The first plate P1 of the stabilization capacitor Cs may be electrically connected to the Nb node of the switching element SWs. The second plate P2 of the stabilization capacitor Cs may be electrically connected to the ground voltage terminal GND.

As shown in Fig. 12, the first plate P1 of the stabilizing capacitor Cs may be made of an integral metal with the Nb node of the switching element SWs.

The stabilization capacitor Cs and the switching elements SWs are arranged in the organic light emitting display panel 110 in such a manner that the external region of the active area in which the image is displayed, Lt; / RTI >

The stabilizing capacitor Cs, the switching element SWs, the gate wiring 1100, and the like can be effectively disposed on the organic light emitting display panel 110 as a sensing stabilization configuration.

FIG. 13 is an exemplary diagram illustrating a sensing driving stabilization configuration of the organic light emitting diode display 100 according to the present embodiments implemented on a flexible printed circuit (FPC).

13, one end of the organic light emitting display 100 according to the present embodiment is connected to the organic light emitting display panel 110 and the other end is connected to the source PCB 200, and the data driver 120 (FPC) in which a source driver integrated circuit (SDIC) included in the source driver integrated circuit (SDIC) is disposed.

Referring to Fig. 13, as a sensing driving stabilization configuration, the stabilization capacitor Cs and the switching element SWs can be arranged in a flexible printed circuit (FPC).

13, the Na node (drain node or source node) of the switching element SWs is electrically connected to the reference voltage line RVL, and the Nb node (source node or drain node) is connected to the stabilization capacitor Cs And is connected to the first plate.

Referring to FIG. 13, the flexible printed circuit (FPC) may have a two-layer structure. In the two-layer structure of the flexible printed circuit (FPC), one layer serves as the first plate of the stabilizing capacitor Cs, and the other layer corresponding to the ground metal layer serves as the stabilizing capacitor Cs 2 plate, it is possible to form the stabilization capacitor Cs.

The switching control signal line 1310 for applying the switching control signal SWCS to the gate node Nc of the switching element SWs may be arranged in the flexible printed circuit FPC.

As described above, by arranging the sensing and driving stabilization structures Cs, SWs, and 1310 in the flexible printed circuit (FPC) outside the organic light emitting display panel 110, the manufacturing process of the organic light emitting display panel 110 can be simplified You do not need to change it. In addition, since the sensing driving stabilization structures Cs, SWs, and 1310 are disposed in the flexible printed circuit (FPC) having the source driver IC (SDIC), the analog Digital converter ADC and the sensing point (stabilizing capacitor Cs connected to the reference voltage line RVL) is shortened, so that the accuracy of the sensing value can be increased.

13, a flexible printed circuit (FPC) is provided with a connection wiring (not shown) electrically connecting the Na node (drain node or source node) of the switching element SWs and the reference voltage line RVL on the OLED panel 110, (1320) may be disposed.

The connection point between the connection wiring 1320 and the reference voltage line RVL may be located at a portion where the flexible printed circuit FPC and the organic light emitting display panel 110 are bonded.

In this manner, the switching element SWs can be electrically connected to the reference voltage line RVL through the connection wiring 1320. [

13, a switching control signal line 1310 disposed on a flexible printed circuit (FPC) can receive a switching control signal SWCS through a source printed circuit board 160.

Thus, the switching operation of the switching element SWs can be efficiently controlled.

FIG. 14 is a timing diagram of the switching element SWs in the sensing driving stabilization configuration of the organic light emitting diode display 100 according to the present embodiments.

Referring to FIG. 14, the switching device SWs may be on-state during the sensing driving mode periods S10, S20, and S30.

Referring to FIG. 14, the switching element SWs may be turned on earlier than the first switch SW1 turned on in the initialization step S10 of the sensing driving mode section. Then, when the second switch SW2 is turned off in the sensing step S30 of the sensing driving mode section or after the second switch SW2 is turned off, the switching element SWs is turned off Can be turned off.

15 is another timing diagram of the switching element SWs in the sensing driving stabilization configuration of the OLED display 100 according to the present embodiments.

Referring to FIG. 15, the switching element SWs may be controlled at the same timing as the control timing of the sensing transistor SENT or at a corresponding timing.

According to the exemplary embodiments of the present invention described above, it is possible to provide the OLED display 100 and the organic light emitting display panel 110, which can improve the sensing accuracy with respect to the characteristic value of the driving transistor and perform accurate compensation.

According to the embodiments, it is possible to provide the organic light emitting display 100 and the organic light emitting display panel 110 having the sensing driving stabilization configuration capable of improving the sensing accuracy with respect to the characteristic value of the driving transistor.

According to the embodiments, the organic light emitting display 100 and the organic light emitting display 100 having the sensing driving stabilization configuration capable of improving the sensing accuracy and the compensation accuracy by providing the potential stability of the reference voltage line serving as the sensing line during sensing driving, The light emitting display panel 110 can be provided.

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

100: display device
110: Display panel
120: Data driver
130: Gate driver
140: Timing controller

Claims (14)

An organic light emitting display panel in which a plurality of data lines and a plurality of gate lines are arranged and in which a plurality of subpixels are arranged;
A data driver driving the plurality of data lines;
A gate driver for driving the plurality of gate lines; And
And a timing controller for controlling the data driver and the gate driver,
Each of the plurality of subpixels includes an organic light emitting diode, a driving transistor for driving the organic light emitting diode, a sensing transistor electrically connected between a first node of the driving transistor and a reference voltage line, A switching transistor electrically connected between the two nodes and the data line; and a storage capacitor electrically connected between the first node and the second node of the driving transistor,
And a stabilization capacitor electrically connected to or disconnected from the reference voltage line according to a driving mode. The method according to claim 1,
The stabilization capacitor includes:
The organic light emitting display according to claim 1,
Wherein the organic light emitting display panel is disposed outside the organic light emitting display panel. The method according to claim 1,
The stabilization capacitor includes:
In the sensing driving mode section, the driving transistor is electrically connected to the reference voltage line,
Wherein the reference voltage line is not connected to the reference voltage line during a display driving mode period. The method of claim 3,
Further comprising a switching element for electrically connecting the reference voltage line and the stabilization capacitor only during a sensing operation according to a switching control signal. 5. The method of claim 4,
The switching device includes:
And a transistor which is controlled according to the switching control signal applied to the gate node and is electrically connected between the reference voltage line and the first plate of the stabilization capacitor. 6. The method of claim 5,
Wherein the stabilizing capacitor and the switching element are disposed on the organic light emitting display panel,
And a gate wiring for applying the switching control signal to the gate node of the switching element is further disposed in the organic light emitting display panel. The method according to claim 6,
A source node or a drain node of the switching element is electrically connected to the first plate of the stabilization capacitor,
And the second plate of the stabilization capacitor is electrically connected to the base low-voltage terminal. 6. The method of claim 5,
Further comprising a flexible printed circuit having one end connected to the organic light emitting display panel and the other end connected to a source printed circuit board and a source driver integrated circuit included in the data driver,
Wherein the stabilizing capacitor and the switching element are arranged in the flexible printed circuit,
And a switching control signal line for applying the switching control signal to the gate node of the switching device is further disposed in the flexible printed circuit. 9. The method of claim 8,
Wherein the flexible printed circuit further comprises a connection wiring for electrically connecting the drain node or the source node of the switching element to the reference voltage line on the organic light emitting display panel. 9. The method of claim 8,
Wherein the switching control signal wiring arranged on the flexible printed circuit comprises:
And the switching control signal is supplied through the source printed circuit board. 5. The method of claim 4,
The switching device includes:
State during the sensing driving mode period,
Wherein the control signal is controlled at the same timing as the control timing of the sensing transistor. A plurality of data lines and a plurality of gate lines arranged in a direction crossing each other; And
A plurality of sub-pixels arranged in a matrix type,
Each of the plurality of sub-
A driving transistor for driving the organic light emitting diode; a sensing transistor electrically connected between a first node of the driving transistor and a reference voltage line; and a driving transistor electrically connected between the second node of the driving transistor and the data line, And a storage capacitor electrically connected between the first node and the second node of the driving transistor,
And a stabilization capacitor electrically connected to or disconnected from the reference voltage line according to a driving mode. 13. The method of claim 12,
The stabilization capacitor includes:
In the sensing driving mode section, the driving transistor is electrically connected to the reference voltage line,
Wherein the organic light emitting display panel is not connected to the reference voltage line in the display driving mode period. 14. The method of claim 13,
Further comprising a switching element for electrically connecting the reference voltage line and the stabilization capacitor only during sensing driving according to a switching control signal.

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