KR20090043301A - Organic light emitting display and driving method thereof - Google Patents

Abstract

The present invention provides a display device comprising: a first sub pixel including a first monitor transistor turned on by a first activation signal supplied from a first signal line to sense a voltage of a first electrode of a first organic light emitting diode; A second sub pixel including a second monitor transistor turned on by a second activation signal supplied from a second signal line to sense a voltage of a first electrode of a second organic light emitting diode; A monitor wiring configured to transfer a voltage of a first electrode of the first organic light emitting diode and the second organic light emitting diode through the first monitor transistor and the second monitor transistor; And a compensation driver configured to generate a data signal to be supplied to the first subpixel or the second subpixel based on the voltages of the first electrodes of the first organic light emitting diode and the second organic light emitting diode transmitted through the monitor wiring. Provide a display device.

OLED display, compensation driver, sub pixel

Description

Organic light emitting display and driving method thereof

The present invention relates to an organic light emitting display device and a driving method thereof.

An organic light emitting display device used in an organic light emitting display device is a self-light emitting device in which a light emitting layer is formed between two electrodes positioned on a substrate.

The organic light emitting device has a top emission type and a bottom emission type depending on the direction of light emission, and a passive matrix type and an active matrix type depending on the driving method. Matrix).

In the organic light emitting display device using an active matrix type of the organic light emitting display device, when a signal is supplied to a plurality of sub pixels arranged in a matrix form on the display unit, a transistor, a capacitor, and an organic light emitting diode positioned inside the sub pixel are driven. The image can be displayed.

However, organic light emitting diodes have a problem in that display quality deteriorates with time, such as deterioration of devices such as thin film transistors, capacitors, and organic light emitting diodes.

Therefore, there is a need to propose a method for solving such a problem in the conventional organic light emitting display device.

SUMMARY OF THE INVENTION An object of the present invention is to provide an organic light emitting display device and a driving method thereof capable of selectively detecting a state of a subpixel and adjusting data to be supplied to the subpixel based on the detected value. To provide.

The present invention provides a first subpixel including a first monitor transistor that is turned on by a first activation signal supplied from a first signal line to sense a voltage of a first electrode of a first organic light emitting diode. ; A second sub pixel including a second monitor transistor turned on by a second activation signal supplied from a second signal line to sense a voltage of a first electrode of a second organic light emitting diode; A monitor wiring configured to transfer a voltage of a first electrode of the first organic light emitting diode and the second organic light emitting diode through the first monitor transistor and the second monitor transistor; And a compensation driver configured to generate a data signal to be supplied to the first subpixel or the second subpixel based on the voltages of the first electrodes of the first organic light emitting diode and the second organic light emitting diode transmitted through the monitor wiring. Provide a display device.

The compensation driver is configured to generate a lookup table in which data between a minimum value and a maximum value of a data signal supplied to the first subpixel or the second subpixel is data, and generates a range of reference voltage values by receiving an arbitrary value from the outside. It may include a reference voltage generator.

The compensation driver compares the reference voltage with the voltage of the first electrode of the first organic light emitting diode or the second organic light emitting diode and selects data preset in the lookup table according to the difference between the reference voltage and the voltage of the first electrode. A data signal to be supplied to the first subpixel or the second subpixel may be generated based on the data.

The first monitor transistor and the second monitor transistor may be supplied with a first activation signal and a second activation signal to be turned on in a period in which the first organic light emitting diode and the second organic light emitting diode emit light.

The first activation signal and the second activation signal may be alternately supplied.

The first subpixel may include a first transistor having a gate connected to the scan line and one end connected to the data line, a second transistor connected to the other end of the first transistor and one end connected to the first power line, and a second transistor An organic light emitting diode having a capacitor connected between the gate and one end of the gate, a first electrode connected to the other end of the second transistor, and a second electrode connected to the second power line, and a gate connected to the first signal line, One end may be connected to the first electrode, and the other end may be connected to the monitor wiring.

The second subpixel may be formed in the same mirror shape as the first subpixel with respect to the monitor wiring.

Transistors included in the first subpixel and the second subpixel may be P-type.

In another aspect, the present invention provides a light emitting step of emitting a first sub pixel and a second sub pixel by supplying a scan signal to the first sub pixel and the second sub pixel, and supplying a data signal and power; The first organic light emission included in the first subpixel or the second subpixel is activated by activating one of the first monitor transistor or the second monitor transistor included in the second subpixel and through the activated first monitor transistor or the second monitor transistor. A sensing step of sensing the voltage of the first electrode of the diode or the second organic light emitting diode through the monitor wiring, comparing the difference between the voltage of the first electrode and the reference voltage detected through the monitor wiring, and compares the first subpixel or the second A method of driving an organic light emitting display device comprising a compensation step of generating a data signal to be supplied to a subpixel.

In the sensing step, the activation signal may be alternately supplied so that the first monitor transistor and the second monitor transistor are alternately activated.

In the compensating step, the voltage of the first electrode and the reference voltage detected by the first organic light emitting diode or the second organic light emitting diode are compared with each other, and the data preset in the lookup table are selected according to the difference between the voltage of the first electrode and the reference voltage. The data signal to be supplied to the first subpixel or the second subpixel may be generated based on the selected data.

In the compensating step, the minimum time of the compensation time for supplying the generated data signal to the first sub pixel or the second sub pixel may be longer than the scan time for scanning one scan line.

In the compensating step, the maximum time of the compensation time for supplying the generated data signal to the first sub pixel or the second sub pixel may be shorter than the scan time for scanning the whole of one frame.

In the compensating step, the width of the compensation time for supplying the generated data signal to the first sub pixel or the second sub pixel may be equal to the width of the scan signal supplied to the one or more scan lines.

In the compensation step, the compensation time for supplying the generated data signal to the first sub pixel or the second sub pixel may be generated as a continuous signal so as not to overlap with other sub pixels.

The present invention has an effect of providing an organic light emitting display device and a driving method thereof capable of selectively detecting a state of a subpixel and adjusting data to be supplied to the subpixel based on the detected value. Accordingly, there is an effect that can solve the problem that the display quality is degraded, such as the driving characteristics are changed by the influence that may occur in the elements included in the sub-pixel.

Hereinafter, with reference to the accompanying drawings, the specific content for the practice of the present invention will be described.

1 is a schematic plan view of an organic light emitting display device according to an embodiment of the present invention.

Referring to FIG. 1, in the organic light emitting display device, a display unit 130 including a plurality of subpixels 120 disposed in a matrix form on a substrate 110 may be located.

The subpixel 120 may include a red subpixel 120R, a green subpixel 120G, and a blue subpixel 120B, but add another color to emit light, such as a white subpixel or an orange subpixel. Can be further formed.

Accordingly, three or more subpixels 120 may be formed according to the purpose. In the present invention, three subpixels, that is, the red, green, and blue subpixels 120R, 120G, and 120B are located in a plurality of positions in a matrix form. One example will be described.

On the outer substrate 110 of the display unit 130, a plurality of wires 140 connected to the sub pixel 120 may be positioned. The plurality of wirings 140 may include a first power wiring and a second power wiring for supplying a voltage to the subpixel 120. In addition, the sub-pixel 120 may include a first wiring and a second wiring for supplying a scan signal and an activation signal. In addition, the sub-pixel 120 may include a data line for supplying a data signal. In addition, it may include a monitor wiring that can detect the state of the sub-pixel 120.

The driving unit 150 may be positioned on the outer lower substrate 110 of the display unit 130.

The driver 150 may include a scan driver connected to first and second wires, which are part of the plurality of wires 140, to supply a scan signal and an activation signal to the subpixels 120. In addition, the driver 150 may include a data driver connected to a data line, which is another part of the plurality of wires 140, to supply a data signal to the subpixels 120. In addition, the driver 150 may include a compensation driver connected to a monitor wire, which is another part of the plurality of wires 140, to detect a state of the subpixels 120. A detailed description of the compensation driver is added to the following.

Meanwhile, in the present invention, for convenience of description, the scan driver, the data driver, and the compensation driver are positioned as a single chip in the driver 150, but the scan driver and the data driver are separately designed and the compensation driver may be mounted in the data driver. It may be. Hereinafter, it is assumed that the data driver and the compensation driver are mounted on the same chip and interoperate with each other.

The pad unit 155 may be located on the outer substrate 110 of the driving unit 150.

The pad unit 155 is intended for electrical connection between the substrate 110 and the external circuit board 160, and the connection between the substrate 110 and the external circuit board 160 is a flexible cable (eg, FPC) ( 165) and the like, but is not limited thereto.

For reference, the driving unit 150 is disposed on the substrate 110 as described above, which is referred to as a chip on glass (COG) method. The driving unit 150 may further include a chip on film arranged on the flexible cable 165. ) Can be designed in such a way as to. That is, the connection with the substrate 110, the driver 150, and the external circuit board 160 may be flexibly designed according to the design method.

On the other hand, on the external circuit board 160, a power supply unit 170 connected to the first power line and the second power line, which is a part of the plurality of wires 140, to supply the voltage to the subpixel 120 may be located. have. In addition, a timing controller 180 may be provided on the external circuit board 160 to supply a scan signal, an activation signal, a data signal, etc. to the driver 150, and other driving devices may be further located.

Hereinafter, the cross-sectional structure of one subpixel will be attached and described in more detail. However, the structure of the subpixel is merely exemplary and is not limited thereto.

2A and 2B are cross-sectional views of subpixels according to an exemplary embodiment of the present invention.

First, referring to FIG. 2A, the substrate 110 may be located.

The substrate 110 may be selected as a material for forming an element having excellent mechanical strength or dimensional stability. As the material of the substrate 110, a glass plate, a metal plate, a ceramic plate or a plastic plate (polycarbonate resin, acrylic resin, vinyl chloride resin, polyethylene terephthalate resin, polyimide resin, polyester resin, epoxy resin, silicone resin, fluorine) Resin, etc.) is mentioned.

The buffer layer 111 may be positioned on the substrate 110. The buffer layer 111 may be formed to protect the thin film transistor formed in a subsequent process from impurities such as alkali ions flowing out of the substrate 110. The buffer layer 111 may use silicon oxide (SiO ₂ ), silicon nitride (SiNx), or the like.

The semiconductor layer 112 may be positioned on the buffer layer 111. The semiconductor layer 112 may include amorphous silicon or polycrystalline silicon obtained by crystallizing the same. Although not shown here, the semiconductor layer 112 may include a channel region, a source region, and a drain region, and the source region and the drain region may be doped with P-type or N-type impurities.

The gate insulating layer 113 may be positioned on the substrate 110 including the semiconductor layer 112. The gate insulating layer 113 may be selectively formed using silicon oxide (SiO ₂ ), silicon nitride (SiNx), or the like.

The gate electrode 114 may be positioned on the gate insulating layer 113 to correspond to the channel region of the semiconductor layer 112. The gate electrode 114 is made of aluminum (Al), aluminum alloy (Al alloy), titanium (Ti), silver (Ag), molybdenum (Mo), molybdenum alloy (Mo alloy), tungsten (W), tungsten silicide (WSi _2). It may include any one of).

An interlayer insulating film 115 may be positioned on the substrate 110 including the gate electrode 114. The interlayer insulating film 115 may be an organic film or an inorganic film, or may be a composite film thereof.

When the interlayer insulating film 115 is an inorganic film, the interlayer insulating film 115 may include silicon oxide (SiO ₂ ), silicon nitride (SiNx), or SOG (silicate on glass). On the other hand, the organic film may include an acrylic resin, a polyimide resin or a benzocyclobutene (BCB) resin. First and second contact holes 115a and 115b may be disposed in the interlayer insulating layer 115 and the gate insulating layer 113 to expose a portion of the semiconductor layer 112.

The first electrode 116a may be positioned on the interlayer insulating film 115. The first electrode 116a may be a first electrode and may have a single layer structure including a conductive layer such as indium tin oxide (ITO) or indium zinc oxide (IZO). In addition, the first electrode 116a may have a multilayer structure including a conductive layer such as indium tin oxide (ITO) or indium zinc oxide (IZO). The description thereof will be described in more detail with reference to the accompanying drawings.

Source and drain electrodes 116b and 116c may be positioned on the interlayer insulating film 115. The source electrode and the drain electrode 116b and 116c may be electrically connected to the semiconductor layer 112 through the first and second contact holes 115a and 115b. A portion of the drain electrode 116c may be positioned on the first electrode 116a and electrically connected to the first electrode 116a.

The source and drain electrodes 116b and 116c may include a low resistance material to lower the wiring resistance. Here, the source electrode and the drain electrode 116b and 116c may be formed of aluminum (Al), aluminum (Alnd), molybdenum (Mo), chromium (Cr), titanium nitride (TiN), molybdenum nitride (MoN), or chromium. It may be formed into a multilayer structure including a metal layer such as nitride (CrN). The description thereof will be described in more detail with reference to the accompanying drawings.

The transistor located on the ideal substrate 110 may include a gate electrode 114, a source electrode, and a drain electrode 116b and 116c, and a transistor array having a plurality of transistors and capacitors may be electrically connected to the following organic light emitting diodes. have. (However, the structure of the capacitor is omitted)

An insulating layer 117 exposing a portion of the first electrode 116a may be disposed on the first electrode 116a (eg, the first electrode). The insulating layer 117 may include an organic material such as benzocyclobutene (BCB) resin, acrylic resin, or polyimide resin.

The organic light emitting layer 118 may be disposed on the exposed first electrode 116a, and the second electrode 119 (eg, the second electrode) may be positioned on the organic light emitting layer 118. The second electrode 119 may be a second electrode supplying electrons to the organic light emitting layer 118, and may include magnesium (Mg), silver (Ag), calcium (Ca), aluminum (Al), or an alloy thereof. can do.

The organic light emitting diode connected to the source or drain electrodes 116b and 116c of the transistor included in the transistor array on the ideal substrate 110 includes the first electrode 116a, the organic light emitting layer 118, and the second electrode 119. It may include.

Unlike FIG. 2A, referring to FIG. 2B, the first electrode 116a positioned on the source or drain electrodes 116b and 116c may be positioned on the planarization layer 117a to planarize the surface of the transistor array. In this case, the insulating layer 117b may be positioned on the planarization layer 117a to expose a portion of the first electrode 116a (eg, the first electrode).

Meanwhile, in the sub pixel structures shown in FIGS. 2A and 2B, the structure of the transistor included in the transistor array may vary depending on whether the gate structure is a top gate or a batam gate. In addition, the structure of the transistor may vary depending on the number of masks used in forming the transistor array and the semiconductor layer material. Therefore, the structure of the subpixel is not limited thereto as described above.

Meanwhile, when the plurality of subpixels emit light, the organic light emitting display device as described above senses a voltage supplied to a selected one of the plurality of subpixels and generates a data signal to supply the selected subpixel based on the detected voltage value. It has a sub pixel circuit configuration that can be compensated by.

Hereinafter, the circuit configuration of the subpixels will be described in more detail, but only two subpixels are shown for clarity and understanding.

3 is a diagram illustrating a circuit configuration of a subpixel according to an exemplary embodiment of the present invention.

Referring to FIG. 3, two sub pixels sub pixel1 and sub pixel2 are illustrated. In the drawing, two sub pixels subpixel1 and sub pixel2 are assumed to be easily distinguished from each other by assuming that the first subpixel1 and the second subpixel2 are subpixel2. In addition, although the first subpixel subpixel1 and the second subpixelsubpixel2 are positioned adjacent to the same scan line as an example, they may be located adjacent to each other on the different scan line.

Hereinafter, a circuit configuration of the first sub pixel 1, which is one of the first sub pixel 1 and the second sub pixel 2, will be described as an example to help understand the circuit configuration of the sub pixel.

The first subpixel subpixel1 may include a first transistor T1 having a gate connected to the scan line Scan and one end connected to the data line Data1. In addition, a gate may be connected to the other end of the first transistor T1 and may include a second transistor T2 having one end connected to the first power line Vdd. In addition, it may include a capacitor (C) connected between the gate and one end of the second transistor (T2). In addition, the first organic light emitting diode D1 may include a first electrode connected to the other end of the second transistor T2 and a second electrode connected to the second power line Gnd. In addition, a first monitor transistor T3 having a gate connected to the first signal line Vdd, one end of which is connected to the first electrode of the first organic light emitting diode D, and the other end of which is connected to the monitor line Mon Can be.

As the first subpixel subpixel1 is formed in such a structure, the second subpixel2 may also have the same circuit configuration as that of the first subpixel1.

However, the first subpixel subpixel1 and the second subpixelsubpixel2 are positioned between the monitor wiring Mon and share the monitor wiring Mon. If the first subpixel subpixel1 and the second subpixelsubpixel2 are positioned adjacent to the same scan line, the monitor line Mon may be formed in parallel with the data lines Data1 and Data2. On the contrary, if the first subpixel subpixel1 and the second subpixelsubpixel2 are adjacent to each other on the scan line, the monitor wiring Mon may be formed in parallel with the scan wiring Scan.

According to the above description, the second subpixel subpixel2 may be formed in the same mirror shape as the first subpixel1 centered on the monitor wire Mon. The transistors included in the first sub pixel 1 and the second sub pixel 2 may be P-type transistors, but are not limited thereto.

Here, the data driver S-Driver may supply a data signal to the first sub-pixel1 and the second sub-pixel2 through the data lines Data1 and Data2. In addition, the compensation driver M-Driver of the organic light emitting diodes D1 and D2 included in one subpixel of the first subpixel1 or the second subpixel2 is connected through the monitor wiring Mon. The first electrode voltage value can be detected.

Summarizing the above description, the first subpixel subpixel1 and the second subpixelsubpixel2 include one or more organic light emitting diodes D1 and D2 and one or more monitor transistors T3 and S3, respectively. can do. In addition, the first sub-pixel (sub pixel1) or the second to turn on one of the first and second monitor transistors (T3, S3) included in the first sub-pixel (sub pixel1) or the second sub-pixel (sub pixel2). The first signal line Test1 and the second signal line Test2 for supplying the first activation signal and the second activation signal to the sub pixel2 may be connected to each other. In addition, the first subpixel (through the first or second monitor transistors T3 and S3 turned on by the first or second activation signal supplied to the first signal line Test1 or the second signal line Test2). Monitor wiring Mon to transfer the voltage of the first electrode of the first or second organic light emitting diodes D1 and D2 included in the sub pixel1 or the second subpixel2 to the compensation driver M-Driver. Can share.

In the above description, the first and second monitor transistors T3 and S3 may be turned on in a section in which the first and second organic light emitting diodes D1 and D2 emit light. First and second activation signals may be supplied from Test2). The first and second activation signals may be alternately supplied to the first signal line Test1 and the second signal line Test2, and the first and second activation signals may be supplied from the scan driver or the compensation driver.

Meanwhile, as the first and second activation signals are alternately supplied as described above, the compensation driver M-Driver is included in one subpixel of the first subpixel1 or the second subpixel2. The voltage of the first electrode of the first or second organic light emitting diodes D1 and D2 will be sensed.

Hereinafter, a compensation driver M-Driver generating a data signal to be supplied to the first sub pixel 1 or the second sub pixel 2 based on the voltage of the first electrode transferred through the monitor wiring Mon. Explain in more detail.

4 is a schematic diagram of a compensation driver and a data driver according to an exemplary embodiment of the present invention. Reference is made to FIG. 3 together to help understand the description.

Although not shown in detail, the compensation driver M-Driver illustrated in FIG. 4 is provided between a minimum value and a maximum value of a data signal supplied to the first sub-pixel 1 or the second sub-pixel 2. It may include a lookup table of data values. The apparatus may further include a reference voltage generator that receives an arbitrary value USR from an external source (eg, a user, a microcomputer, etc.) to generate a range of reference voltage values differently. Here, the data value can be extended to other values, such as registers, instructions, of course.

The compensation driver M-Driver alternates the activation signal supplied through the first signal line Test1 and the second signal line Test2 to the first subpixel1 and the second subpixel2. As supplied, the first electrode voltages of the first or second organic light emitting diodes D1 and D2 included in the two sub pixels 1 and sub pixel 2 may be sensed through one monitor wire Mon. .

The compensation driver M-Driver compares the voltage of the first electrode detected from the first sub-pixel 1 or the second sub-pixel 2 with a reference voltage included therein and according to the difference between the two values. Data preset in the lookup table may be selected.

Thereafter, the compensation driver M-Driver may transfer the selected data value FB to the data driver S-Driver. The data driver S-Driver, which receives the data value FB from the compensation driver M-Driver, may supply the first sub-pixel1 or the second sub-pixel2 based on the data value FB. The data signal may be generated, and the generated data signal may be supplied to the first subpixel1 or the second subpixel2 through the data lines Data1 and Data2.

Therefore, the compensation driver M-Driver may generate the data value FB to adjust the amount of the data signal or the voltage of the data signal output from the data driver S-Driver. When the compensation driver M-Driver transfers the data value FB to the data driver S-Driver, the data driver S-Driver may use the first sub-pixel1 or the first pixel based on the data value FB. The data signal to be supplied to the subpixel 2 can be adjusted.

That is, the data driver S-Driver may directly output a data signal to be supplied to the first sub pixel sub pixel 1 or the second sub pixel sub pixel 2. Indirectly generating the data signal to adjust the data signal to be supplied to the second sub-pixel2 may be a compensation driver M-Driver.

To help understand the description, the following assumptions are added.

It is assumed that the data value of the voltage flowing through the organic light emitting diode is in the range of 1 to 100. At this time, any value that can be set by the reference voltage generator may be advantageously in the range of 1 to 100, but is not limited thereto.

Here, the range of the data value of the voltage flowing through the organic light emitting diode corresponds to the total grayscale data signal to be expressed in the subpixel, and the voltage corresponding to all the grayscale data signals is a range value flowing through the organic light emitting diode. Can be defined.

In addition to the above assumptions, assuming that an arbitrary value input from the outside has a value of 50, and at any point in time, assuming that the voltage of the first electrode sensed through a specific sub-pixel also has 50, the two values are the same. The data signal to be supplied to a specific sub pixel may not be adjusted. On the contrary, assuming that an arbitrary value input from the outside has 60, and at some point, assuming that the voltage of the first electrode sensed through a specific sub-pixel also has 50, the two values are different. Data may be generated to adjust a data signal to be supplied to a specific subpixel.

Therefore, the random value USR set in the reference voltage generator is a determination condition for detecting whether a value less than the original signal is supplied to a specific sub pixel when the data signal is supplied to the sub pixel. will be.

Therefore, the compensation driver M-Driver may determine whether to adjust data to be supplied to a specific sub-pixel and how much to adjust the data signal in the next scan period based on the information obtained through the above process. Here, the larger the range of the data valued value is, the wider the range of the determination condition becomes, so that the data signal to be supplied to the subpixel can be more accurately adjusted.

Hereinafter, the driving method will be described. However, reference is made to FIG. 3 to help understand the description.

The scan signal is supplied to the first sub-pixel 1 and the second sub-pixel 2, and the data signal and power are supplied to emit light of the first sub-pixel 1 and the second sub-pixel 2. The light emitting step can be carried out.

In more detail, the light emission step may include a scan step and a data storage step. The scan step may be a step of turning on the first transistor T1 by supplying a scan signal to the scan line Scan connected to the first subpixel subpixel1 and the second subpixel2 subpixel2. In the data storage step, the data signals are respectively supplied to the data lines Data1 and Data2 connected to the first subpixel1 and the second subpixel2 to store the data voltages in the capacitor C, respectively. It may be a step.

Thereafter, a first or second activation signal is supplied to activate one of the first or second monitor transistors T3 and S3 included in the first sub-pixel subpixel1 or the second sub-pixel2 subpixel2. The first or second organic light emitting diodes D1 and D2 included in the first subpixel1 or the second subpixel2 through the activated first or second monitor transistors T3 and S3. A sensing step of sensing the voltage supplied to the monitor through the monitor wiring Mon may be performed.

In the sensing step, the first and second activation signals are configured to activate one of the first or second monitor transistors T3 and S3 included in the first subpixel1 or the second subpixel2. Can be supplied alternately.

Thereafter, a compensation step of comparing a difference between the voltage of the first electrode and the reference voltage detected through the monitor wiring Mon and generating a data signal to be supplied to the first subpixel1 or the second subpixel2. Can be carried out.

In the compensating step, the voltage of the first electrode sensed through the first subpixel1 or the second subpixel2 subpixel2 is compared with a reference voltage, and data preset in the lookup table according to the difference between the two values is obtained. The data signal may be generated to be supplied to the first sub pixel 1 or the second sub pixel 2 based on the selected data.

Further, the minimum time of the compensation time for supplying the data signal generated in the compensation step to the first sub pixel 1 or the second sub pixel 2 may be longer than the scan time for scanning one scan line. A) Also, in the compensating step, the maximum time of the compensation time for supplying the generated data signal to the first sub pixel 1 or the second sub pixel 2 is shorter than the scan time for scanning the whole of one frame. (B)

Therefore, the range of compensation time may be equal to (A) <compensation time ≤ (B).

Further, in the compensating step, the width of the compensation time for supplying the generated data signal to the first sub pixel 1 or the second sub pixel 2 may be equal to the width of the scan signal supplied to one or more scan lines. have.

In addition, in the compensating step, a compensation time for supplying the generated data signal to the first sub pixel 1 or the second sub pixel 2 may be generated as a continuous signal so as not to overlap with other sub pixels.

The present invention has an effect of providing an organic light emitting display device and a driving method thereof capable of selectively detecting states of neighboring subpixels and adjusting data to be supplied to the subpixels based on the sensed values. Accordingly, there is an effect that can solve the problem that the display quality is degraded, such as the driving characteristics are changed by the influence that may occur in the elements included in the sub-pixel. In addition, since the neighboring sub-pixels share the same monitor wiring, it is possible to give flexibility in design and secure an aperture ratio.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical configuration of the present invention described above may be modified in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

1 is a schematic plan view of an organic light emitting display device according to an embodiment of the present invention;

Degree.

2A and 2B illustrate cross-sectional views of subpixels according to an exemplary embodiment of the present invention.

3 is an exemplary circuit configuration of a subpixel according to an embodiment of the present invention.

4 is a schematic diagram of a compensation driver and a data driver according to an embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

110: substrate 120: subpixel

130: display unit 140: a plurality of wirings

150: drive unit 160: external circuit board

170: power supply unit 180: timing controller unit

Claims (15)

A first sub pixel that is turned on by a first activation signal supplied from the first signal line and includes a first monitor transistor configured to sense a voltage of a first electrode of the first organic light emitting diode; A second sub pixel including a second monitor transistor turned on by a second activation signal supplied from a second signal line to sense a voltage of a first electrode of a second organic light emitting diode; A monitor wiring configured to transfer a voltage of a first electrode of the first organic light emitting diode and the second organic light emitting diode through the first monitor transistor and the second monitor transistor; And A compensation driver configured to generate a data signal to be supplied to the first sub pixel or the second sub pixel based on the voltages of the first electrodes of the first organic light emitting diode and the second organic light emitting diode transmitted through the monitor wiring; An organic light emitting display device. The method of claim 1, The compensation driver, A lookup table in which a value between a minimum value and a maximum value of a data signal supplied to the first subpixel or the second subpixel is converted into data; An organic light emitting display device comprising a generator. The method of claim 2, The compensation driver, The reference voltage is compared with the voltage of the first electrode of the first organic light emitting diode or the second organic light emitting diode, and the data preset in the lookup table are selected according to the difference between the reference voltage and the voltage of the first electrode. An organic light emitting display device for generating a data signal to be supplied to the first subpixel or the second subpixel based on data. The method of claim 1, The first monitor transistor and the second monitor transistor, The organic light emitting display device receives the first activation signal and the second activation signal such that the first organic light emitting diode and the second organic light emitting diode are turned on in a light emitting period. The method of claim 1, The first activation signal and the second activation signal, An organic light emitting display device which is alternately supplied. The method of claim 1, The first sub pixel is, A first transistor having a gate connected to the scan line and one end connected to the data line, a second transistor connected to the other end of the first transistor and one end connected to the first power line, and a gate and one end of the second transistor A first organic light emitting diode having a capacitor connected therebetween, a first electrode connected to the other end of the second transistor, and a second electrode connected to a second power line; and a gate connected to the first signal line; And a first monitor transistor having one end connected to a first electrode of the organic light emitting diode and the other end connected to the monitor wiring. The method of claim 6, The second sub pixel is, And an organic light emitting display device having the same mirror shape as the first subpixel with respect to the monitor wiring. The method of claim 1, The transistors included in the first sub pixel and the second sub pixel include: P-type organic light emitting display device. A light emitting step of supplying a scan signal to the first subpixel and the second subpixel, supplying a data signal and power to emit light of the first subpixel and the second subpixel; Activate one of the first monitor transistor or the second monitor transistor included in the first subpixel or the second subpixel and activate the first subpixel or the second through the activated first monitor transistor or the second monitor transistor. Sensing the voltage of the first electrode of the first organic light emitting diode or the second organic light emitting diode included in the sub pixel through the monitor wiring; Comparing the difference between the voltage of the first electrode and the reference voltage sensed through the monitor wiring and generating a data signal to be supplied to the first sub pixel or the second sub pixel of the organic light emitting display device Driving method. The method of claim 9, In the sensing step, A method of driving an organic light emitting display device, wherein the activation signal is alternately supplied to alternately activate the first monitor transistor and the second monitor transistor. The method of claim 9, In the compensation step, The voltage of the first electrode and the reference voltage sensed by the first organic light emitting diode or the second organic light emitting diode are compared with each other. And selecting and generating a data signal to be supplied to the first sub pixel or the second sub pixel based on the selected data. The method of claim 9, In the compensation step, A method of driving an organic light emitting display device, wherein a minimum time of a compensation time for supplying a generated data signal to the first sub pixel or the second sub pixel is longer than a scan time for scanning one scan line. The method of claim 9, In the compensation step, A method of driving an organic light emitting display device, wherein a maximum time of a compensation time for supplying a generated data signal to the first sub pixel or the second sub pixel is shorter than a scan time for scanning an entire frame. The method of claim 9, In the compensation step, A method of driving an organic light emitting display device, wherein a width of a compensation time for supplying a generated data signal to the first subpixel or the second subpixel is equal to a width of a scan signal supplied to at least one scan line. The method of claim 9, In the compensation step, And a compensation time for supplying the generated data signal to the first sub pixel or the second sub pixel is generated as a continuous signal so as not to overlap with another sub pixel.

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