KR100757563B1 - Organic electroluminescent device for preventing cross-talk phenomenon and method of driving the same - Google Patents

Abstract

The present invention relates to an organic electroluminescent device which sets the same total current values flowing in the scan lines. The organic electroluminescent device includes a panel, a data storage unit and a cross-talk prevention unit. The panel includes a plurality of light emitting pixels formed in light emitting regions where data lines and bidirectional scan lines intersect. The data storage unit stores algibi data input from the outside, and provides the stored algibi data. The cross-talk prevention unit is connected to the scan lines, and applies a predetermined current to the scan lines, respectively, in accordance with AlgiBee data provided from the data storage unit. The organic electroluminescent device sets the total current values flowing through the scan lines in the same manner, so that no cross-talk phenomenon occurs in the panel.

Organic electroluminescent devices, cross-talk

Description

ORGANIC ELECTROLUMINESCENT DEVICE FOR PREVENTING CROSS-TALK PHENOMENON AND METHOD OF DRIVING THE SAME}

1A is a block diagram illustrating a conventional organic EL device.

1B and 1C are circuit diagrams illustrating a method of driving the organic EL device of FIG. 1A.

2A is a block diagram illustrating an organic EL device according to an exemplary embodiment of the present invention.

2B and 2C are circuit diagrams illustrating a method of driving the organic EL device of FIG. 2A.

3 is a block diagram illustrating an organic EL device according to another exemplary embodiment of the present invention.

The present invention relates to an organic electroluminescent device for cross-talk prevention and a method for driving the same, and more particularly, to an organic electroluminescent device for setting the same total current value flowing through the scan lines and a method for driving the same.

The organic electroluminescent device is a self-luminous device that generates light having a predetermined wavelength by using an organic material layer included therein.

1A is a block diagram illustrating a conventional organic EL device, and FIGS. 1B and 1C are circuit diagrams illustrating a method of driving the organic EL device of FIG. 1A.

Referring to FIG. 1A, a conventional organic EL device includes a panel 100, a first scan driver 102, a second scan driver 104, a data storage unit 106, and a data driver 208.

The panel 100 includes light emitting pixels E11 to E34 formed in light emitting regions where the data lines D1 to D3 and the scan lines S1 to S4 cross each other. Here, some of the scan lines S1 to S4 S1 and S3 are formed in one direction as shown in FIG. 1A, and the remaining scan lines S2 and S4 are formed in the other direction, that is, the scan lines S1 to S4 are formed in both directions.

The first scan driver 102 is connected to some S1 and S3 of the scan lines S1 to S4 and transmits first scan signals to some scan lines S1 and S3.

The second scan driver 104 is connected to the remaining scan lines S2 and S4 and transmits the second scan signals to the remaining scan lines S2 and S4.

The data storage unit 106 stores algibi data (RGB data) input from the outside in latches included therein.

The data driver 108 applies a data current corresponding to the Algibi data provided from the data storage unit 106 to the data lines D1 to D3, so that the light emitting pixels E11 to E34 emit light.

Hereinafter, a conventional method of driving an organic EL device will be described with reference to FIGS. 1B and 1C. However, it is assumed that the light emitting pixels E11 to E34 emit light when the corresponding scan line is connected to the ground and do not emit light when connected to the non-emission voltage V1. In addition, a data current of 0A is applied to the eleventh light emitting pixel E11, a data current of 3A is applied to the remaining light emitting pixels E12 and E34, and a total current flowing through the scan lines S1 to S4, respectively. Assume that the value is designed to be 10A. In addition, the resistance of the portion corresponding to the outer edge of the outermost data lines D1 to D3 among the scan lines S1 to S4 is 10 Ω, and the resistance of the portion corresponding to the light emitting pixels E11 to E34. Let each be 2Ω.

Referring to FIG. 1B, the first scan line S1 is connected to ground, and the second and fourth scan lines S2 and S4 have the same size as the driving voltage of the organic EL device. Is connected to the voltage V1. Accordingly, the 21st and 31st light emitting pixels E21 and E31 of the light emitting pixels E11 to E31 corresponding to the first scan line S1 emit light. In this case, the total current flowing in the first scan line S1 is 6A. Thus, the cathode end of the eleventh light emitting pixel E11 has a voltage of 60V, the cathode end of the twenty-first light emitting pixel E21 has a voltage of 72V, and the cathode end of the thirty-first light emitting pixel E31 has a voltage of 78V.

Referring to FIG. 1C, the second scan line S2 is connected to ground, and the first, third and fourth scan lines S1, S3, and S4 are connected to the non-emitting voltage V1. Therefore, the light emitting pixels E12 to E32 corresponding to the second scan line S2 emit light. In this case, the current value flowing in the second scan line S2 is 9A. Therefore, the cathode of the twenty-first light emitting pixel E21 has a voltage of 108V, the cathode of the twenty-second light emitting pixel E22 has a voltage of 102V, and the cathode of the thirty-second light emitting pixel E32 has a voltage of 90V.

In other words, the cathode ends of the light emitting pixels E11 to E31 corresponding to the first scan line S1 and the cathode ends of the light emitting pixels E12 to E32 corresponding to the second scan line S2 have average voltage values. It's very different. Here, the data current applied to the light emitting pixels E11 to E34 is influenced by the voltage values of the cathode ends of the light emitting pixels E11 to E34, and thus, the pixels E11 corresponding to the first scan line S1. Although the luminance of the first through E31 and the luminance of the pixels E12 to E32 corresponding to the second scan line S2 must be the same, they are different. For example, when a data current of 3A is applied to the twelfth light emitting pixel E12 and the twenty-second light emitting pixel E22, the twelfth light emitting pixel E12 should emit the same light as the twenty-second light emitting pixel E22. In fact, the twelfth light emitting pixel E12 emits light brighter than the twenty-second light emitting pixel E22. In addition, such a luminance difference, that is, a contrast difference is immediately recognized by the user, and this phenomenon is called a cross-talk phenomenon.

In short, in the conventional organic electroluminescent device, voltage values of the cathode ends of the pixels E11 to E34 were different, so that a cross-talk phenomenon occurred.

An object of the present invention is to provide an organic electroluminescent device in which no cross-talk phenomenon occurs and a method of driving the same.

In order to achieve the above object, the organic electroluminescent device according to the preferred embodiment of the present invention includes a panel, a data storage unit and a cross-talk prevention unit. The panel includes a plurality of light emitting pixels formed in light emitting regions where data lines and bidirectional scan lines intersect. The data storage unit stores algibi data input from the outside, and provides the stored algibi data. The cross-talk prevention unit is connected to the scan lines, and applies a predetermined current to the scan lines, respectively, in accordance with AlgiBee data provided from the data storage unit.

According to another preferred embodiment of the present invention, an organic electroluminescent device for cross-talk prevention includes a panel and a cross-talk prevention portion. The panel includes a plurality of light emitting pixels formed in light emitting regions where data lines and bidirectional scan lines intersect. The cross-talk prevention unit detects a voltage corresponding to a current value flowing in each of the scan lines, compares the detected voltage with a desired voltage, and applies a predetermined current to the scan lines according to the comparison result.

According to an exemplary embodiment of the present disclosure, a method of driving an organic light emitting diode including bidirectional scan lines and data lines crossing the bidirectional scan lines may include one direction among the scan lines based on externally input AlgiBi data (RGB data). Applying a first current to the scan lines respectively formed; And applying a second current to the remaining scan lines, respectively, according to the Algi ratio data. However, when the current is applied, the total current values of the scan lines are the same.

According to another exemplary embodiment of the present invention, a method of driving an organic light emitting device including bidirectional scan lines and data lines intersecting the same may include applying a data current corresponding to Algivy data input from the outside to the data lines. Doing; And applying a predetermined current to the scan line by comparing a voltage corresponding to the sum of the data currents flowing in the scan line connected to the ground among the scan lines with a preset input voltage.

The cross-talk preventing organic electroluminescent device and the method of driving the same according to the present invention set the total current values flowing through the scan lines equally, so that no cross-talk phenomenon occurs in the panel.

Hereinafter, with reference to the accompanying drawings will be described in detail preferred embodiments of the cross-talk prevention organic electroluminescent device and a method of driving the same.

2A is a block diagram illustrating an organic EL device according to an exemplary embodiment of the present invention, and FIGS. 2B and 2C are circuit diagrams illustrating a method of driving the organic EL device of FIG. 2A.

Referring to FIG. 2A, the organic electroluminescent device of the present invention includes a panel 200, a first scan driver 202, a second scan driver 204, a data storage 206, a data driver 208, and a cross- Torque prevention unit 210 is included.

The panel 200 includes light emitting pixels E11 to E34 and dummy data lines DD1 and DD2 formed in light emitting regions where the data lines D1 to D3 and the scan lines S1 to S4 intersect. The dummy pixels DE1 to DE4 are formed in the dummy light emitting regions where the scan lines S1 to S4 intersect. Here, some of the scan lines S1 to S4 S1 and S3 are formed in one direction as shown in FIG. 2A, and the remaining scan lines S2 and S4 are formed in the other direction, that is, the scan lines S1 to S4 are formed in both directions.

Each of the light emitting pixels E11 to E34 includes an anode electrode layer, an organic material layer, and a cathode electrode layer. When a predetermined voltage is applied to the anode electrode layer and the cathode electrode layer, holes provided from the anode electrode layer and electrons provided from the cathode electrode layer flow into the organic material layer, and then the holes and electrons recombine to light of a predetermined wavelength. Generates.

The first scan driver 202 is connected to some of the scan lines S1 to S4 (S1 and S3), and transmits the first scan signals to some of the scan lines S1 and S3.

The second scan driver 204 is connected to the remaining scan lines S2 and S4 and transmits the second scan signals to the remaining scan lines S2 and S4.

Of course, the scan driver 202 may transmit scan signals to scan lines S1 to S4 formed bidirectionally.

The data storage unit 206 stores the RGBI data (RGB data) input from the outside in the latches included therein.

The data driver 208 applies a data current corresponding to the Algibi data provided from the data storage unit 206 to the data lines D1 to D4, so that the light emitting pixels E11 to E34 emit light.

The cross-talk prevention unit 210 prevents a cross-talk phenomenon from occurring in the panel 200, and controls the current control unit 212, the first current providing unit 214, and the second current providing unit. And 216.

The current controller 212 receives the ALGBI data from the data storage unit 206, and transmits the first control signal CS1 and the second control signal CS2 to the first current providing unit 214 according to the ALGBI data. And transmits to the second current providing unit 216.

The first current providing unit 214 includes a first current source, and scans the first current generated from the first current source in accordance with the first control signal CS1 provided from the current controller 212. Is applied to S3, so that the total current values flowing through the respective scan lines S1 to S4 are equal.

The second current providing unit 216 includes a second current source, and scans the second current generated from the second current source according to the second control signal CS2 provided from the current controller 212 to the remaining scan lines S2 and. S4), so that the total current values flowing through the respective scan lines S1 to S4 are equal.

A detailed description thereof will be given with reference to FIGS. 2B and 2C. However, it is assumed that the light emitting pixels E11 to E34 emit light when the corresponding scan line is connected to the ground and do not emit light when connected to the non-emission voltage V1. In addition, a data current of 0A is applied to the first light emitting pixel E11, a data current of 3A is applied to the remaining light emitting pixels E12 and E34, and a total current flowing through the respective scan lines S1 to S4. Assume that the value is designed to be 10A. In addition, the resistance of the portion corresponding to the outer edge of the outermost data lines D1 to D3 among the scan lines S1 to S4 is 10 Ω, and the resistance of the portion corresponding to the light emitting pixels E11 to E34. Let each be 2Ω.

Referring to FIG. 2B, the first scan line S1 is connected to ground, and the second and fourth scan lines S2 and S4 have the same size as the driving voltage of the organic EL device. Is connected to the voltage V1. Accordingly, the 21st and 31st light emitting pixels E21 and E31 of the light emitting pixels E11 to E31 corresponding to the first scan line S1 emit light. In this case, the current controller 212 analyzes the ALG ratio data provided from the data storage unit 206 to detect that the total current flowing in the first scan line S1 is 6A, and controls the first control corresponding to the detection result. The signal CS1 is transmitted to the first current providing unit 214. Subsequently, the first current providing unit 214 applies 4A current to the first scan line S1 through the first dummy data line DD1 and the first dummy pixel DE1 according to the first control signal CS1. do. As a result, a total of 10 A current flows through the first scan line S1. In this case, the cathode end of the eleventh light emitting pixel E11 has a voltage of 100V, the cathode end of the twenty-first light emitting pixel E21 has a 112V voltage, and the cathode end of the thirty-first light emitting pixel E31 has a voltage of 118V. .

Referring to FIG. 2C, the second scan line S2 is connected to ground, and the first, third and fourth scan lines S1, S3, and S4 are connected to the non-emitting voltage V1. As a result, the light emitting pixels E12 to E32 corresponding to the second scan line S2 emit light. In this case, the current control unit 212 analyzes the Algibi data provided from the data storage unit 206, and according to the analysis result, the second current providing unit 216 supplies 1A current to the second dummy data line DD2 and The second scan line S2 is applied to the second scan line S2 through the second dummy pixel DE2. As a result, a total of 10 A current flows in the second scan line S2. In this case, the cathode end of the twelfth light emitting pixel E12 has a voltage of 118V, the cathode end of the twenty-second light emitting pixel E22 has a 112V voltage, and the cathode end of the thirty-second light emitting pixel E32 has a 100V voltage. .

Since the third and fourth scan lines S3 and S4 operate similarly to the second scan line S2, the description of the operation will be omitted.

Hereinafter, the voltage value of the cathode terminal of the light emitting pixels E11 to E34 is detected, and then, the organic electroluminescent device of the present invention and the conventional organic electroluminescent device are compared.

The voltage difference between the cathode ends of the twenty-first light emitting pixel E21 and the twenty-second light emitting pixel E22 is 0V, and the voltage difference between the cathode ends of the thirty-first light emitting pixel E31 and the thirty-second light emitting pixel E32 is 18V.

In short, the average of the voltage differences of the cathode ends in the organic EL device of the present invention is much smaller than the average of the voltage differences of the cathode ends in the conventional organic EL device. Therefore, the contrast difference generated by the voltage difference of the cathode terminals in the organic EL device of the present invention is smaller than the contrast difference in the conventional organic EL device. As a result, the contrast difference is recognized by the user in the conventional organic EL device, but the contrast difference is not recognized by the user in the organic EL device of the present invention. That is, in the organic electroluminescent device of the present invention, unlike the conventional organic electroluminescent device, no cross-talk phenomenon occurs.

Hereinafter, the driving method of the organic electroluminescent element of this invention is explained in full detail.

The data storage unit 206 stores algibi data input from the outside.

Subsequently, the first scan driver 202 transmits the first scan signals to some scan lines, and the second scan driver 204 transmits the second scan signals to the remaining scan lines. However, the first and second scan signals are sequentially transmitted to the scan lines S1 to S4 corresponding to the order of the scan lines S1 to S4.

In the organic electroluminescent device driving method according to another embodiment of the present invention, the step of transmitting the scan signals may be performed before the step of storing the Algibi data.

Subsequently, the data driver 208 applies a data current corresponding to the Algivy data transmitted from the data storage unit 206 to the data lines D1 to D3.

Subsequently, the current control unit 212 transmits the first control signal CS1 to the first current providing unit 214 according to the AlGeB data provided from the data storage unit 206, and transmits the second control signal CS2 to the second control signal CS2. 2 is transmitted to the current providing unit 216.

Subsequently, the first current providing unit 214 applies a first current to the partial scan line according to the first control signal CS1, and the second current providing unit 216 applies the second control signal CS2 to the first scan signal CS2. Accordingly, a second current is applied to the remaining scan lines.

3 is a block diagram illustrating an organic EL device according to another exemplary embodiment of the present invention.

Referring to FIG. 3, the organic electroluminescent device of the present invention includes a panel 300, a first scan driver 302, a second scan driver 304, a data storage 306, a data driver 308, and a cross- Torque prevention unit 310 is included.

Since the other components except the cross-talk prevention unit 310 perform the same functions as those of FIG. 2A, the description thereof will be omitted.

The cross-talk prevention unit 310 includes a first current providing unit 314 and a second current providing unit 316.

The first current controller 312 applies a predetermined current to some scan lines by using a first OP amplifier included therein so that the total current values flowing through the scan lines S1 to S4 are the same. .

Hereinafter, the operation of the first current controller 312 will be described in detail by taking the first scan line S1 as an example. However, the total current flowing through each of the scan lines S1 to S4 by using the first op amp is 10A, and in this case, the voltage across the cathode terminal of the eleventh dummy pixel DE11 is 100V.

One end of an input terminal of the first op amp receives a 100 V input voltage V2 corresponding to the total current value. In addition, the other end of the input terminal is connected to the twenty-first dummy pixel DE21, and thus the other end detects a voltage applied to the cathode terminal of the twenty-first dummy pixel E21. In this case, when the voltage detected by the other end is different from the input voltage V2, the first op amp includes the first dummy data line DD1 such that the voltage across the cathode end of the eleventh dummy pixel DE11 is 100V. A predetermined current is applied to the first scan line S1 through (). On the other hand, when the voltage detected by the other end is equal to the input voltage V2, the first op amp does not output any current.

The second current controller 314 applies a predetermined current to the remaining scan lines using a second op amp included therein so that the total current values flowing through the scan lines S1 to S4 are the same.

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art having various ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention. Additions should be considered to be within the scope of the following claims.

As described above, the organic electroluminescent device for cross-talk prevention and the method of driving the same according to the present invention set the total current values flowing through the scan lines equally, so that the cross-talk phenomenon does not occur in the panel. have.

Claims (13)

A panel including a plurality of light emitting pixels formed in light emitting regions where data lines and bidirectional scan lines intersect; A data storage unit for storing the ALGBI data input from the outside and providing the stored ALGBI data; And And a cross-torque prevention unit connected to the scan lines and configured to apply a predetermined current to the scan lines in accordance with AlgiBee data provided from the data storage unit. The method of claim 1, wherein the panel, Dummy data lines formed at outer edges of the outermost data lines and dummy pixels formed at dummy light emitting regions where the scan lines intersect; And the cross-talk prevention unit applies current to the scan lines through the dummy data lines and the dummy pixels. The method of claim 2, wherein the cross-talk prevention unit, A current control unit for analyzing the Algibi data transmitted from the data storage unit and generating a first control signal and a second control signal having information on the analysis result; A first current providing unit configured to apply current to a scan line corresponding to the partial dummy data line through some of the dummy data lines and corresponding dummy pixels according to a first control signal generated from the current controller; And And a second current providing unit configured to apply current to the scan line corresponding to the remaining dummy data lines through the remaining dummy data lines and the corresponding dummy pixels according to the second control signal generated from the current controller. An organic electroluminescent device for preventing cross-talk. 4. The organic electroluminescent device of claim 3, wherein each of the current providing units includes a current source. The method of claim 1, wherein the organic electroluminescent device, A first scan driver connected to some of the scan lines on one side of the panel and transmitting first scan signals to the partial scan lines; A second scan driver connected to the other scan lines on the other side of the panel and transmitting second scan signals to the remaining scan lines; And And a data driver configured to apply a data current corresponding to the AlgiBee data provided from the data storage unit to the data lines. A panel including a plurality of light emitting pixels formed in light emitting regions where data lines and bidirectional scan lines intersect; And A cross-talk prevention unit configured to detect a voltage corresponding to a current value flowing through each of the scan lines, compare the detected voltage with a preset input voltage, and apply a predetermined current to the scan lines according to the comparison result. Cross-talk prevention organic electroluminescent device comprising a. The method of claim 6, wherein the cross-talk prevention unit comprises an op amp, And one end of the input terminal of the op amp receives the input voltage, and the other end thereof is connected to the scan lines to detect a voltage corresponding to the current value. The method of claim 6, wherein the panel, Dummy data lines formed at outer edges of the outermost data lines and dummy pixels formed at dummy light emitting regions where the scan lines intersect; And the cross-talk prevention unit applies current to the scan lines through the dummy data lines and the dummy pixels. A method of driving an organic electroluminescent device comprising bidirectional scan lines and data lines crossing the bidirectional scan lines, Applying a first current to each of the scan lines formed in one direction among the scan lines according to the Argibi data (RGB data) input from the outside; And Applying a second current to the remaining scan lines, respectively, according to the Algi ratio data, The method of driving an organic electroluminescent device according to claim 1, wherein the total current values of the respective scan lines are the same by applying the current. The method of claim 9, wherein applying the first current comprises: Generating a first control signal in accordance with the Algivy data; And Applying a first current corresponding to the Algi ratio data to the scan lines according to the generated first control signal, Applying the second current, Generating a second control signal in accordance with the Algivy data; And And applying a second current corresponding to the ALG ratio data to the remaining scan lines according to the generated second control signal. The method of claim 9, wherein the organic electroluminescent device driving method comprises Providing first scan signals to the scan lines formed in the one direction; Providing second scan signals to the remaining scan lines; Storing the algibi data; And And providing a data current corresponding to the stored Algivy data to the data lines. A method of driving an organic electroluminescent device comprising bidirectional scan lines and data lines crossing the bidirectional scan lines, Applying a data current corresponding to an AlGeebi data input from the outside to the data lines; And And applying a predetermined current to the scan line by comparing a voltage corresponding to the sum of the data currents flowing in the scan line connected to the ground among the scan lines with a preset input voltage. Driving method. The method of claim 12, wherein applying the current, Detecting a voltage corresponding to the sum of the data currents; Comparing the detected voltage with the input voltage; And And applying a predetermined current to the scan line such that the total current values flowing through the scan lines are the same when the detected voltage and the input voltage are different from each other.

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