KR101380442B1 - Organic Light Emitting Display and Driving Method for the same - Google Patents

Abstract

The present invention provides a switching transistor for transmitting a data signal in response to a first scan signal, a capacitor for storing the data signal as a data voltage, a driving transistor for driving in response to the data voltage, and emitting light as the driving transistor is driven. A plurality of subpixels including an organic light emitting diode and a monitor transistor configured to detect a first voltage applied to a first electrode of the organic light emitting diode in response to a second scan signal; A data driver supplying a data signal to the plurality of subpixels; A monitor resistor connected between the second electrode of the organic light emitting diode and the second power supply wire for supplying a second power source to the second electrode of the organic light emitting diode and detecting a second voltage applied to the second electrode of the organic light emitting diode; And a monitor unit detecting a first voltage through a monitor transistor, a second voltage through a monitor resistor, and calculating a difference voltage between the first voltage and the second voltage to generate a correction signal. to provide.

Organic light emitting display, correction signal, monitor

Description

[0001] The present invention relates to an organic light emitting display,

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

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

The organic electroluminescent device has a top emission mode and a bottom emission mode depending on a direction in which light is emitted and a passive matrix type and an active matrix type Active Matrix).

Among the organic light emitting display devices, an organic light emitting display device using an active matrix type includes a transistor, a capacitor, and an organic light emitting diode positioned inside a subpixel when a scan signal and a data signal are supplied to a plurality of subpixels arranged in a matrix form on a display unit. The diode is driven to display an image.

On the other hand, in the conventional active matrix organic light emitting display device, a transistor is formed on a substrate using an excimer laser. For this reason, there is a problem in that stripes appear due to ELA (Eximer Laser Annealing) on the display unit, and thus luminance is differently expressed.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems of the background art is to provide an organic light emitting display device and a driving method thereof which can improve the problem of deterioration of display quality.

The present invention provides a switching transistor for transmitting a data signal in response to the first scan signal, a capacitor for storing the data signal as a data voltage, a driving transistor for driving in response to the data voltage, and a driving transistor. A plurality of subpixels including an organic light emitting diode that emits light as a light is driven and a monitor transistor configured to detect a first voltage applied to a first electrode of the organic light emitting diode in response to a second scan signal; A data driver supplying a data signal to the plurality of subpixels; A monitor resistor connected between the common wiring connected to the second electrode of the organic light emitting diode and the second power wiring for supplying a second power supply to the common wiring and detecting a second voltage applied to the second electrode of the organic light emitting diode; And a monitor unit detecting a first voltage through a monitor transistor, a second voltage through a monitor resistor, and calculating a difference voltage between the first voltage and the second voltage to generate a correction signal. to provide.

The data driver may correct data signals to be supplied to the plurality of subpixels based on the correction signals transmitted from the monitor unit.

Each of the plurality of subpixels includes a switching transistor having a gate connected to a first scan wire to which a first scan signal is supplied and one end to a data wire to which a data signal is supplied, and a gate connected to the other end of the switching transistor and having a first power source. An organic light emitting diode having one end connected to a wiring, a capacitor connected at one end to a first power supply wiring and another end connected to a gate of the driving transistor, and a first electrode connected to the other end of the driving transistor and a second electrode connected to a common wiring The display device may include a diode and a monitor transistor having a gate connected to the second scan line to which the second scan signal is supplied, one end connected to the first electrode of the organic light emitting diode, and the other end connected to the monitor.

One end of the monitor resistor may be connected to the common wiring and the other end of the second power supply wiring, and one end of the monitor resistor may be connected to the monitor unit.

The first voltage may be a voltage applied to the anode of the organic light emitting diode, and the second voltage may be a voltage applied to the cathode of the organic light emitting diode.

The monitor transistor may transfer a voltage applied to the first electrode of the organic light emitting diode to the monitor in response to the second scan signal.

On the other hand, the present invention is a step of detecting the first voltage applied to the first electrode of the organic light emitting diode included in the plurality of sub-pixel; Detecting a second voltage applied to a second electrode of the organic light emitting diode; Generating a correction signal by calculating a difference voltage between the first voltage and the second voltage; And correcting the data signal based on the correction signal and supplying the data signal to the plurality of subpixels.

In the detecting of the second voltage, the second voltage may be detected through one end of the monitor resistor positioned between the second electrode of the organic light emitting diode and the second power line for supplying the second power to the second electrode.

In the detecting of the first voltage, the first voltage may be detected through one end of the monitor transistor connected to the first electrode of the organic light emitting diode.

The first voltage may be a voltage applied to the anode of the organic light emitting diode, and the second voltage may be a voltage applied to the cathode of the organic light emitting diode.

The present invention has the effect of providing an organic light emitting display device and a driving method thereof which can improve the problem of deterioration of display quality.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

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

As shown in FIG. 1, the organic light emitting display may include a display unit 120 on which a plurality of subpixels P are disposed. The plurality of subpixels P located on the substrate 110 are vulnerable to moisture or oxygen.

Thus, the substrate 110 and the sealing substrate 130 can be sealed by providing the sealing substrate 130 and forming the adhesive member 140 on the outer substrate 110 of the display unit 120. On the other hand, the plurality of sub-pixels P may be driven by the driving unit 150 positioned on the substrate 110 to display an image.

The driver 150 generates a scan driver for supplying first and second scan signals to the plurality of subpixels P, a data driver for supplying data signals to the plurality of subpixels P, and a correction signal to generate the correction signal. It may include a monitor to deliver. Here, the driver 150 is only schematically illustrated as an example that the scan driver, the data driver, and the monitor are formed on one chip, and the scan driver, the data driver, and the monitor are separated from the substrate 110 or the outside of the substrate 110. Can be located.

On the other hand, the above-described subpixels may be as follows.

2A is an exemplary cross-sectional view of the subpixel shown in FIG.

As shown in FIG. 2A, a buffer layer 105 is located on a substrate 110. Buffer layer 105 is selectively using, for example, to form to protect the transistor to be formed in a subsequent process from impurities such as alkali ions leaked from the substrate 110, silicon oxide (SiO _2), silicon nitride (SiNx) .

Here, the substrate 110 may be glass, plastic or metal.

The semiconductor layer 111 is located on the buffer layer 105. The semiconductor layer 111 may include amorphous silicon or crystallized polycrystalline silicon.

In addition, the semiconductor layer 111 may include a source region and a drain region including p-type or n-type impurities, and may include a channel region other than the source region and the drain region.

A first insulating film 115, which may be a gate insulating film, is located on the semiconductor layer 111. The first insulating film 115 may be a silicon oxide film (SiOx), a silicon nitride film (SiNx), or a multilayer thereof.

The gate electrode 120c may be positioned at a position corresponding to a certain region of the semiconductor layer 111 located on the first insulating film 115, that is, a channel region when impurities are implanted. The scan line 120a and the capacitor lower electrode 120b may be positioned on the same layer as the gate electrode 120c.

The gate electrode 120c is formed of a material selected from the group consisting of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper One or an alloy thereof.

The gate electrode 120c may be formed of a material selected from the group consisting of Mo, Al, Cr, Au, Ti, Ni, Ne, Or an alloy of any one selected from the above.

Further, the gate electrode 120c may be a double layer of molybdenum / aluminum-neodymium or molybdenum / aluminum.

The scan line 120a may be formed of a material selected from the group consisting of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper One or an alloy thereof. In addition, the scan wiring 120a includes molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu). It may be a multi-layer consisting of any one or an alloy thereof selected from. Further, the scan line 120a may be a double layer of molybdenum / aluminum-neodymium or molybdenum / aluminum.

The second insulating film 125 to be an interlayer insulating film is located on the substrate 110 including the scan wiring 120a, the capacitor lower electrode 120b and the gate electrode 120c. The second insulating layer 125 may be a silicon oxide layer (SiOx), a silicon nitride layer (SiNx), or a multilayer thereof.

The contact holes 130b and 130c for exposing a part of the semiconductor layer 111 are located in the second insulating film 125 and the first insulating film 115. [

Drain electrodes and source electrodes 140c and 140d electrically connected to the semiconductor layer 111 through the contact holes 130b and 130c passing through the second insulating layer 125 and the first insulating layer 115 are formed in the pixel region Located.

The drain electrode and the source electrode 140c and 140d may be formed of a single layer or multiple layers and may be formed of a single layer of molybdenum (Mo), aluminum (Al), chromium (Cr) , Gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu). When the drain electrode and the source electrodes 140c and 140d are multi-layered, a triple layer of molybdenum / aluminum-neodymium, molybdenum / aluminum / molybdenum or molybdenum / aluminum-neodymium / molybdenum may be used.

The data line 140a, the capacitor upper electrode 140b, and the power supply line 140e may be positioned on the same layer as the drain electrode and the source electrodes 140c and 140d.

The data wiring 140a and the power supply wiring 140e located in the non-pixel region may be formed of a single layer or multiple layers. When the data wiring 140a and the power wiring 140e are single layers, the data wiring 140a and the power wiring 140e may be made of molybdenum And may be made of any one selected from the group consisting of Al, Cr, Au, Ti, Ni, Ne, and Cu.

When the data wiring 140a and the power wiring 140e are multilayered, they may be formed of a triple layer of molybdenum / aluminum-neodymium, molybdenum / aluminum / molybdenum or molybdenum / aluminum-neodymium / molybdenum.

In addition, the data wiring 140a and the power wiring 140e may be formed of a triple layer of molybdenum / aluminum-neodymium / molybdenum.

The third insulating film 145 is located on the data wiring 140a, the capacitor upper electrode 140b, the drain and source electrodes 140c and 140d and the power supply wiring 140e. The third insulating film 145 may be a planarizing film for alleviating the step difference of the lower structure and may be formed of an organic material such as polyimide, benzocyclobutene series resin, acrylate, And may be formed of an inorganic material such as SOG (spin on glass) which is cured and then cured.

Alternatively, the third insulating layer 145 may be a passivation layer, or may be a silicon nitride layer (SiNx), a silicon oxide layer (SiOx), or a multilayer thereof.

A via hole 165 exposing one of the drain and source electrodes 140c and 140d is disposed in the third insulating layer 145, and the drain and source electrodes are formed on the third insulating layer 145 through the via hole 165. The first electrode 160 is electrically connected to any one of 140c and 140d.

The first electrode 160 may be an anode, and may be a transparent electrode or a reflective electrode. Here, the first electrode 160 may be a transparent electrode when the structure of the organic light emitting display device is a back surface or a double-sided light emission. The first electrode 160 may be a transparent electrode such as indium tin oxide (ITO), indium zinc oxide (IZO) It can be either.

In addition, the first electrode 160 may be a reflective electrode when the structure of the organic light emitting display device is a front emission type, and aluminum (Al), silver (Ag), or the like may be formed under the layer of any one of ITO, IZO, Nickel (Ni), and in addition, a reflective layer may be included between two layers of any one of ITO, IZO, and ZnO.

A fourth insulating layer 155 is disposed on the first electrode 160 to insulate the first electrodes adjacent to the first electrode 160 and include an opening 175 for exposing a portion of the first electrode 160. The light emitting layer 170 is located on the first electrode 160 exposed by the opening 175.

The second electrode 180 is located on the light emitting layer 170. The second electrode 180 may be a cathode electrode and may be made of magnesium (Mg), calcium (Ca), aluminum (Al), silver (Ag), or an alloy thereof having a low work function.

Here, when the organic light emitting display device has a front or double-sided light emitting structure, the second electrode 180 may be formed to a thickness thin enough to transmit light, and when the organic light emitting display device has a rear light emitting structure, It can be formed thick enough to reflect light.

The above-described embodiments are based on a total of seven masks, namely, a semiconductor layer, a gate electrode (including a scan wiring and a capacitor lower electrode), contact holes, a source electrode and a drain electrode (including a data wiring, a power supply wiring, , The first electrode and the opening are formed by using a mask.

Hereinafter, an embodiment in which an organic electroluminescent display device is formed using a total of five masks is disclosed. The description of the parts overlapping with those described above in the embodiments described below will be omitted.

2B is another cross-sectional exemplary view of the subpixel shown in FIG.

2B, the buffer layer 105 is located on the substrate 110, and the semiconductor layer 111 is located on the buffer layer 105. [ The first insulating film 115 is positioned on the semiconductor layer 111 and the gate electrode 120c, the capacitor lower electrode 120b and the scan wiring 120a are positioned on the first insulating film 115. [ And the second insulating film 125 is located on the gate electrode 120c.

The first electrode 160 is positioned on the second insulating layer 125 and the contact holes 130b and 130c are exposed to expose the semiconductor layer 111. [ The first electrode 160 and the contact holes 130b and 130c may be formed at the same time.

A source electrode 140d, a drain electrode 140c, a data wiring 140a, a capacitor upper electrode 140b, and a power supply wiring 140e are located on the second insulating film 125. [ Here, a part of the drain electrode 140c may be located on the first electrode 160. [

The third insulating layer 145, which may be a pixel definition layer or a bank layer, is positioned on the substrate 110 on which the above-described structure is formed, and the opening 175 exposing the first electrode 160 is positioned in the third insulating layer 145. do. The light emitting layer 170 is located on the first electrode 160 exposed by the opening 175 and the second electrode 180 is located on the light emitting layer 170.

(Including a scan line and a capacitor lower electrode), a first electrode (including a contact hole), a source / drain electrode (including a data line, a power supply line, and a capacitor upper electrode) And the organic electroluminescent display device using a mask in the process of forming the openings has an advantage that the number of masks is reduced and the manufacturing cost is reduced and the efficiency of mass production is increased.

Such an organic light emitting display device may have various methods for implementing a color image. A method of implementing the organic light emitting display will be described with reference to FIGS. 3A to 3B.

3A to 3B illustrate embodiments of implementing a color image in an organic light emitting display device according to an embodiment of the present invention.

3A, the color image forming method shown in FIG. 3A includes a red color emitting layer 170R, a green color light emitting layer 170G, and a blue color light emitting layer 170B separately emitting red, green, and blue light, And shows an image implementation method.

As shown in FIG. 3A, red light, green light, and blue light are provided from the respective light emitting layers 170R, 170G, and 170B, respectively, so that red light / green light / blue light are mixed to display a color image.

Here, the upper and lower portions of the light emitting layers 170R, 170G, and 170B may further include an electron transport layer (ETL), a hole transport layer (HTL), and the like, and various modifications may be made to the arrangement and structure thereof.

In addition, the color image implementation method illustrated in FIG. 3B is a color image implementation method of an organic light emitting display device including a white emission layer 270W, a red color filter 290R, a green color filter 290G, and a blue color filter 290B. It is shown.

The white light provided from the white light emitting layer 270W is transmitted through the red color filter 290R, the green color filter 290G and the blue color filter 290B while the red light / green light / Respectively, so that a color image can be displayed.

Here, the upper and lower portions of each white light emitting layer 270W may further include an electron transport layer (ETL), a hole transport layer (HTL), and the like, and the arrangement and structure thereof may be variously modified.

Here, the bottom emission structure is shown and described in FIGS. 3A and 3B, but the present invention is not limited thereto, and various modifications can be made to the arrangement and structure of the top emission structure.

In addition, although two types of driving methods have been shown and described with respect to the color image realizing method, the present invention is not limited thereto, and various modifications are possible as needed.

4 is a hierarchical structure diagram of an organic light emitting diode according to an embodiment of the present invention.

Referring to FIG. 4, an organic light emitting diode according to an embodiment of the present invention includes a substrate 110 and a first electrode 160 positioned on the substrate 110, and positioned on the first electrode 160. A hole injection layer 171, a hole transport layer 172, a light emitting layer 170, an electron transport layer 173, an electron injection layer 174, and a second electrode 180 positioned on the electron injection layer 174. can do.

First, a hole injection layer 171 is formed on the first electrode 160. The hole injection layer 171 may function to smoothly inject holes from the first electrode 160 into the light emitting layer 170 and may be formed of at least one selected from the group consisting of CuPc (cupper phthalocyanine), PEDOT (poly (3,4) -ethylenedioxythiophene ), PANI (polyaniline) and NPD (N, N-dinaphthyl-N, N'-diphenyl benzidine).

The hole injection layer 171 described above can be formed by an evaporation method or a spin coating method.

The hole transport layer 172 plays a role of facilitating the transport of holes and may be formed by using NPD (N, N-dinaphthyl-N, N'-diphenyl benzidine), TPD (N, N'- , N'-bis- (phenyl) -benzidine), s-TAD and MTDATA (4,4 ', 4 "-tris (N-3-methylphenyl-N-phenylamino) But is not limited thereto.

The hole transport layer 172 can be formed by evaporation or spin coating. The light emitting layer 170 described above may be formed of a material that emits red, green, blue, and white light, and may be formed using phosphorescent or fluorescent materials.

When the light emitting layer 170 is red, it includes a host material containing CBP (carbazole biphenyl) or mCP (1,3-bis (carbazol-9-yl), and PIQIr (acac) (bis (1-phenylisoquinoline) acetylacetonate Phosphorescent light containing a dopant including any one or more selected from the group consisting of iridium), PQIr (acac) (bis (1-phenylquinoline) acetylacetonate iridium), PQIr (tris (1-phenylquinoline) iridium) and PtOEP (octaethylporphyrin platinum) It may be made of a material, alternatively may be made of a fluorescent material including PBD: Eu (DBM) 3 (Phen) or perylene, but is not limited thereto.

When the light emitting layer 170 is green, it may be made of a phosphorescent material including a dopant material including a host material including CBP or mCP and containing Ir (ppy) 3 (fac tris (2-phenylpyridine) iridium) Alternatively, it may be made of a fluorescent material including Alq3 (tris (8-hydroxyquinolino) aluminum), but is not limited thereto.

When the light emitting layer 170 is blue, it may include a phosphorescent material including a dopant material including (4,6-F2ppy) 2Irpic including a host material including CBP or mCP.

Alternatively, the fluorescent material may include any one selected from the group consisting of spiro-DPVBi, spiro-6P, distyrylbenzene (DSB), distyrylarylene (DSA), PFO polymer, and PPV polymer. It is not limited.

Here, the electron transport layer 173 serves to facilitate the transport of electrons, at least one selected from the group consisting of Alq3 (tris (8-hydroxyquinolino) aluminum), PBD, TAZ, spiro-PBD, BAlq and SAlq. It may be made but not limited thereto.

The electron transporting layer 173 can be formed by an evaporation method or a spin coating method. The electron transport layer 173 may also prevent holes injected from the first electrode from passing through the light emitting layer to the second electrode. That is, it may serve as a hole blocking layer and may serve to efficiently combine holes and electrons in the light emitting layer.

Here, the electron injection layer 174 serves to smooth the injection of electrons, and may use Alq3 (tris (8-hydroxyquinolino) aluminum), PBD, TAZ, spiro-PBD, BAlq or SAlq .

The electron injection layer 174 may be formed by vacuum evaporation of organic and inorganic materials forming the electron injection layer.

Here, the hole injection layer 171 or the electron injection layer 174 may further include an inorganic material, and the inorganic material may further include a metal compound. The metal compound may include an alkali metal or an alkaline earth metal. Metal compound including an alkali metal or alkaline earth metal LiQ, LiF, NaF, KF, RbF, CsF, FrF, BeF 2, MgF 2, CaF 2, SrF 2, BaF any one selected from the group consisting of ₂ and RaF ₂ or more But is not limited thereto.

In other words, the inorganic material in the electron injection layer 174 facilitates hopping of electrons injected from the second electrode 180 to the light emitting layer 170, thereby improving the light emission efficiency by balancing the holes and electrons injected into the light emitting layer. Can be improved.

The inorganic material in the hole injection layer 171 reduces the mobility of holes injected from the first electrode 160 into the light emitting layer 170 so as to balance the holes and electrons injected into the light emitting layer 170, .

Here, the present invention is not limited to FIG. 4, and at least one of the electron injection layer 174, the electron transport layer 173, the hole transport layer 172, and the hole injection layer 171 may be omitted.

Hereinafter, a circuit configuration of a subpixel according to an embodiment of the present invention will be described.

5 is a diagram illustrating a circuit configuration of a subpixel according to an embodiment of the present invention. However, a circuit configuration will be described using, for example, a first subpixel1 among the illustrated subpixels subpixel1, subpixel2, and subpixel3.

As illustrated in FIG. 5, the first sub pixel subpixel1 may include a switching transistor S1 that transfers a data signal in response to the first scan signal. In addition, the capacitor C1 may store a data signal as a data voltage. In addition, the driving transistor T1 may be driven to correspond to the data voltage. In addition, the driving transistor T1 may include an organic light emitting diode D1 that emits light as the driving transistor T1 is driven. In addition, the display device may include a monitor transistor M1 that performs switching in response to the second scan signal.

The first sub pixel 1 may have a connection relationship as follows.

The switching transistor T1 may have a gate connected to the first scan line Scan1 to which the first scan signal is supplied, and one end thereof to the data line Data1 to which the data signal is supplied. In addition, a gate of the driving transistor T1 may be connected to the other end of the switching transistor S1 and one end of the driving transistor T1 may be connected to the first power line Vdd. One end of the capacitor C1 may be connected to the first power line Vdd and the other end of the capacitor C1 may be connected to the gate of the driving transistor T1. The organic light emitting diode D1 may have a first electrode connected to the other end of the driving transistor T1 and a second electrode connected to the common line Com. In addition, a gate of the monitor transistor M1 is connected to the second scan line Mon1 to which the second scan signal is supplied, one end of the monitor transistor M1 is connected to the first electrode of the organic light emitting diode D1, and the other end of the monitor transistor M1 is connected to the monitor V1. ) May be connected. The other end V1 of the monitor transistor M1 may be connected to the terminal V1 of the monitor unit Monitor.

Referring to the circuit configuration and connection relationship of the first subpixel described above, the circuit configuration of the second subpixel2 and the third subpixel subpixel3 may be known as well as the connection relationship. Hereinafter, a description of each element included in the second and third subpixels sub pixel2 and sub pixel3 will be referred to only when necessary.

Meanwhile, all of the second electrodes of the organic light emitting diodes D1, D2, and D3 included in each of the subpixels subpixel1, subpixel2, and subpixel3 may be connected to the common line Com. The common line Com may be connected to one end of the resistor Rmon, and the other end of the resistor Rmon may be connected to a second power line Vss for supplying a second power source to the common line Com.

The monitor unit monitors the first electrodes of the organic light emitting diodes D1, D2, and D3 through the monitor transistors M1, M2, and M3 included in each of the subpixels subpixel1, subpixel2, and subpixel3. The first voltage caught may be detected. In addition, the monitor unit may be configured to be connected to the second electrode of the organic light emitting diodes D1, D2, and D3 included in each of the subpixels subpixel1, subpixel2, and subpixel3 through a common wiring Com. The voltage can be detected. In more detail, the portion detecting the second voltage may be a connection Vmon to which the common wiring Com) and the resistor Rmon are connected.

The monitor unit described above may generate the correction signal FB by calculating the difference voltage between the detected first voltage and the second voltage. The data driver receives the correction signal FB from the monitor and corrects a data signal to be supplied to each of the subpixels subpixel1, subpixel2, and subpixel3 based on the correction signal FB. Can be.

That is, the monitor detects the first voltage applied to the anodes of the organic light emitting diodes D1, D2, and D3 and the second voltage applied to the cathodes of the organic light emitting diodes D1, D2, and D3. The difference voltage between the first voltage and the second voltage may be calculated to generate a correction signal FB.

Meanwhile, the monitor transistors M1, M2, and M3 selectively respond to the second scan signal supplied through the second scan wires Mon1, Mon2, and Mon3, and the organic light emitting diodes D1, D2, and D3. The first voltage applied to the first electrode of) may be transmitted to the monitor. Accordingly, the monitor may detect the first voltage through the turned on monitor transistor.

Meanwhile, a driving method of an organic light emitting display device according to an embodiment of the present invention will be described.

6 is a flowchart illustrating a driving method of an organic light emitting display device according to an exemplary embodiment of the present invention.

A method of driving an organic light emitting display device according to an embodiment of the present invention may include a measurement value setting step S105, a correction signal generation step S109, and a data signal correction step S111.

Here, in the measurement value setting step S105, the first voltage applied to the first electrode of the organic light emitting diode included in the plurality of subpixels is detected, and the second voltage applied to the second electrode of the organic light emitting diode is detected.

In operation S109, the correction signal is generated by calculating a difference voltage between the first voltage and the second voltage.

The data signal correction step S111 is a step of correcting the data signal based on the correction signal and supplying the data signal to the plurality of subpixels.

Here, in the step of detecting the second voltage, the second voltage can be detected through one end of the monitor resistor positioned between the second electrode of the organic light emitting diode and the second power line for supplying the second power to the second electrode. have. In addition, in the detecting of the first voltage, the first voltage may be detected through one end of the monitor transistor connected to the first electrode of the organic light emitting diode. In addition, the first voltage may be a voltage applied to the anode of the organic light emitting diode, and the second voltage may be a voltage applied to the cathode of the organic light emitting diode.

Meanwhile, before performing the driving method according to the present invention, an initial panel characteristic measurement step (S101) of measuring the characteristics of the panel of the organic light emitting display device may be performed. In this case, the initial panel characteristic measurement may be a step of measuring initial values of a first voltage applied to an anode of an organic light emitting diode included in a plurality of subpixels positioned in a panel and a second voltage applied to a cathode of an organic light emitting diode. Can be.

After the initial value is measured, a reference value setting step (S103) of dividing the measured value into a maximum value, a minimum average value, a median value, and the like and setting reference values may be performed. The reference values obtained through the initial panel characteristic measurement step S101 and the reference value setting step S103 performed in this way can be written in a lookup table located in the monitor unit.

In the measurement value setting step S105 described above, the measurement value for the continuously driven panel characteristics may be calculated, and a reference value may be written in the lookup table.

Then, from the measurement value setting step S105, the measurement value and the reference value deviation calculation step S107 may be performed to calculate the deviation between the measurement value obtained through the measurement value setting step S105 and the reference value written in the lookup table.

The measured value and the reference value deviation calculating step (S107) compares the measured panel characteristics with the characteristics of the panel deteriorated by continuous driving thereafter, and after the comparison, corrects the data signal based on the deviation between the reference value and the measured value. It can be created.

The present invention has the effect of providing an organic light emitting display device and a driving method thereof that can improve the problem of display quality deterioration. In this case, there is an effect that the display quality is deteriorated by the ELA (Eximer Laser Annealing) stripe among the factors that degrade the display quality.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

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

FIG. 2A is an exemplary cross-sectional view of the subpixel shown in FIG. 1; FIG.

FIG. 2B is another cross-sectional exemplary view of the subpixel shown in FIG. 1; FIG.

3A to 3B illustrate embodiments of implementing a color image in an organic light emitting display device according to an embodiment of the present invention.

4 is a hierarchical structure view of an organic light emitting diode according to an embodiment of the present invention.

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

6 is a flowchart illustrating a method of driving an organic light emitting display device according to an embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

110: substrate 120: display unit

130: sealing substrate 140: adhesive member

150: driver P: subpixel

Claims (10)

A switching transistor for transmitting a data signal in response to a first scan signal, a capacitor for storing the data signal as a data voltage, a driving transistor for driving in response to the data voltage, and an organic light emitting diode when the driving transistor is driven A plurality of subpixels including a light emitting diode and a monitor transistor configured to switch in response to a second scan signal; A data driver supplying the data signal to the plurality of subpixels; A resistor connected between a common line connected to a second electrode of the organic light emitting diode and a second power line for supplying a second power source to the common line; And Detects a first voltage applied to the first electrode of the organic light emitting diode through the monitor transistor, detects a second voltage through the common wiring, calculates a difference voltage between the first voltage and the second voltage, and corrects a correction signal. An organic light emitting display device comprising a monitor for generating a. The method according to claim 1, The data driver may include: An organic light emitting display device configured to correct data signals to be supplied to the plurality of subpixels based on the correction signals transmitted from the monitor unit. The method according to claim 1, Each of the plurality of subpixels, A gate connected to a first scan wire to which the first scan signal is supplied, one end of which is connected to a data wire to which the data signal is supplied, a gate connected to the other end of the switching transistor, and one end to a first power wire The connected driving transistor, the capacitor having one end connected to the first power line and the other end connected to the gate of the driving transistor, a first electrode connected to the other end of the driving transistor, and a second electrode connected to the common line. And a monitor transistor connected to a gate of the organic light emitting diode connected to the second scan line to which the second scan signal is supplied, one end of which is connected to a first electrode of the organic light emitting diode, and the other end of which is connected to the monitor unit. Organic light emitting display device. The method of claim 3, The resistor, One end connected to the common line, the other end connected to the second power line, and one end of the resistor connected to the monitor unit. The method according to claim 1, The first voltage is a voltage applied to the anode of the organic light emitting diode, And the second voltage is a voltage applied to a cathode of the organic light emitting diode. The method according to claim 1, The monitor transistor, And an organic light emitting display device configured to transfer the first voltage to the monitor unit in response to the second scan signal. Detecting a first voltage applied to a first electrode of an organic light emitting diode included in the plurality of subpixels; A resistor is connected between the common wire connected to the second electrode of the organic light emitting diode and the second power wire for supplying a second power source to the common wire, and the second wire is connected to the second electrode of the organic light emitting diode through the common wire. Detecting two voltages; Generating a correction signal by calculating a difference voltage between the first voltage and the second voltage; And And correcting a data signal based on the correction signal and supplying the data signal to the plurality of sub-pixels. delete 8. The method of claim 7, In the detecting of the first voltage, And the first voltage is detected through a monitor transistor connected to the first electrode of the organic light emitting diode. 8. The method of claim 7, The first voltage is a voltage applied to the anode of the organic light emitting diode, And the second voltage is a voltage applied to a cathode of the organic light emitting diode.

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