KR100634672B1 - Organic electroluminescent device and method of driving the same - Google Patents

Abstract

An organic electroluminescence element and a driving method thereof are provided to make sub pixels generate the same luminance for the same data current by setting different discharge levels for each sub pixel. An organic electroluminescence element includes a panel(200) having plural sub pixels formed in luminescent regions where data lines(D1~D6) and scan lines(S1~S5) cross each other and comprising red sub pixels(E11~E15,E41~E45), green sub pixels(E21~E25,E51~E55), and blue sub pixels(E31~E35,E61~E65); a data storage unit(204) for storing RGB(Red, Green, Blue) data input from the outside; and a discharge unit(206) for discharging first sub data lines corresponding to the red sub pixels of the data lines, second sub data lines corresponding to the green sub pixels, and third sub data lines corresponding to the blue sub pixels, according to the RGB data supplied from the data storage unit.

Description

Organic electroluminescent device and method of driving the same {ORGANIC ELECTROLUMINESCENT DEVICE AND METHOD OF DRIVING THE SAME}

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

FIG. 1B is a timing diagram illustrating scan signals and data current provided to the subpixels of FIG. 1A.

FIG. 1C is a detailed view of the subpixel of FIG. 1A.

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

FIG. 2B is a circuit diagram illustrating the discharge part of FIG. 2A according to an exemplary embodiment of the present invention. FIG.

2C is a diagram illustrating luminous efficiency of each subpixel.

The present invention relates to an organic electroluminescent device and a method of driving the same, and more particularly, to an organic electroluminescent device and a method of driving the same to compensate for the sub-pixels having different luminance characteristics by adjusting the discharge level.

The organic EL device generates light having a specific wavelength when a predetermined voltage is applied.

FIG. 1A is a block diagram illustrating a conventional organic EL device, and FIG. 1B is a timing diagram illustrating scan signals and data currents provided to the subpixels of FIG. 1A. 1C is a diagram illustrating the subpixel of FIG. 1A in detail.

Referring to FIG. 1A, a conventional organic EL device includes a panel 100, a scan driver 102, a data storage unit 104, a discharge unit 106, a precharge unit 108, and a data driver 110. Include.

The panel 100 includes a plurality of sub pixels E11 to E65 which are formed in emission areas where the data lines D1 to D6 and the scan lines S1 to S5 cross each other.

The data lines D1 to D6 include first sub data lines D1 and D4, second sub data lines D2 and D5, and third sub data lines D3 and D6.

The sub pixels E11 to E65 correspond to the red sub pixels E11 to E15, E41 to E45, and the second sub data lines D2 and D5 corresponding to the first sub data lines D1 and D4. The green subpixels E21 to E25 and E51 to E55 and the blue subpixels E31 to E35 and E61 to E65 corresponding to the third sub data lines D3 and D6 are included.

The red subpixels E11 to E15 and E41 to E45 emit red color when emitting light, and the green subpixels E21 to E25 and E51 to E55 emit green color when emitting light, and the blue subpixels E31. To E35, E61 to E65) emit blue color when emitting light.

Here, each of the red subpixels E11 to E15, E41 to E45, the green subpixels E21 to E25, E51 to E55, and the blue subpixels E31 to E35, E61 to E65 are gathered into one pixel. To form.

For example, the first red subpixel E11, the first green subpixel E21, and the first blue subpixel E31 are gathered to form a first pixel.

The scan driver 102 sequentially transmits scan signals to the pixels E11 to E65 through the scan lines S1 to S5.

The data storage unit 104 sequentially stores algibi data (RGB data) input from the outside.

The discharge unit 106 discharges the data lines D1 to D6 according to the ALG ratio data transmitted from the data storage unit 104.

Specifically, as shown in FIG. 1C, there is a parasitic capacitor connected in parallel to each of the subpixels.

Therefore, when a data current is applied to the data lines D1 to D6, the data charge is charged to the parasitic capacitors.

Subsequently, the discharge unit 106 discharges the charges charged in the parasitic capacitors to 0% gray level as shown in FIG. 1B.

Although only the first data line D1 is illustrated in FIG. 1B, the remaining data lines are also discharged to 0% gradation.

The precharge unit 108 precharges the data lines D1 to D6 according to the ALG ratio data provided from the data storage unit 104.

The data driver 110 provides data signals to the precharged data lines D1 to D6 according to the AlGeB data provided from the data storage unit 104.

That is, the data driver 110 provides the data currents corresponding to the Algivy data to the data lines D1 to D6 to charge the data lines D1 to D6.

As a result, the sub pixels E11 to E65 emit light.

However, even when the same data current is applied to the subpixels E11 to E65, the subpixels E11 to D65 emit light with different luminance for each subpixel.

This is because the luminance characteristics for each subpixel are different.

For example, when the same data current is applied to the data lines D1 to D6, the red subpixels E11 to E15 and E41 to E45 emit light with a brightness of 100 candelas, whereas the green subpixels are emitted. E21 to E25 and E51 to E55 emit light with a brightness of 80 candelas, and the blue subpixels E31 to E35 and E61 to E65 emit light with a brightness of 90 candelas.

That is, in the conventional organic electroluminescent device, luminance control was not easy for each subpixel, and thus luminance control was not easy, and green and blue subpixels (E21 to E25, E51 to E55, E31 to E35, and E61 to E65). The luminous efficiency was lowered due to the luminance characteristic of.

It is a first object of the present invention to provide an organic electroluminescent device capable of emitting the same luminance for each service pixel with respect to the same data current, and a method of driving the same.

It is a second object of the present invention to provide an organic electroluminescent device for compensating data lines in a low luminance region and a method of driving the same.

In order to achieve the object as described above, the organic electroluminescent device according to an embodiment of the present invention includes a panel, a data storage unit and a discharge unit. The panel has a plurality of subpixels formed in light emitting regions where data lines and scan lines intersect and include red subpixels, green subpixels, and blue subpixels. The data storage unit stores algibi data input from the outside. The discharge part includes first sub data lines corresponding to red sub pixels among the data lines, second sub data lines corresponding to the green sub pixels, and the blue color according to the AlGeB data provided from the data storage part. The third sub data lines corresponding to the sub pixels are discharged to different levels.

According to an exemplary embodiment of the present invention, organic electroluminescence is formed in the emission regions where the data lines and the scan lines intersect, and include a plurality of subpixels having red subpixels, green subpixels, and blue subpixels. A method of driving an element includes providing a first data current to the data lines corresponding to first Algibi data input from an external device; And first sub data lines corresponding to red sub pixels of the data lines, and a second sub corresponding to the green sub pixels, according to the first algibi data and the second algibi data input thereto. Discharging the data lines and the third sub data lines corresponding to the blue sub pixels to different levels.

Since the organic EL device and the method of driving the same according to the present invention set different discharge levels for each subpixel, the subpixels may generate the same luminance for the same data current.

In addition, the organic EL device and the method of driving the same compensate for the sub data lines in the low luminance region, and thus, the sub pixels corresponding to the sub data lines may emit light with desired luminance.

Hereinafter, with reference to the accompanying drawings will be described in detail preferred embodiments of the organic electroluminescent device and a method for driving the same according to the present invention.

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

Referring to FIG. 2A, the organic electroluminescent device of the present invention includes a panel 200, a scan driver 202, a data storage 204, a discharge unit 206, a precharge unit 208, and a data driver 210. It includes.

The panel 200 includes a plurality of sub pixels E11 to E65 which are formed in emission areas where the data lines D1 to D6 and the scan lines S1 to S5 cross each other.

The data lines D1 to D6 include first sub data lines D1 and D4, second sub data lines D2 and D5, and third sub data lines D3 and D6.

The sub pixels E11 to E65 correspond to the red sub pixels E11 to E15, E41 to E45, and the second sub data lines D2 and D5 corresponding to the first sub data lines D1 and D4. The green subpixels E21 to E25 and E51 to E55 and the blue subpixels E31 to E35 and E61 to E65 corresponding to the third sub data lines D3 and D6 are included.

The red subpixels E11 to E15 and E41 to E45 emit red color when emitting light, and the green subpixels E21 to E25 and E51 to E55 emit green color when emitting light, and the blue subpixels E31. To E35, E61 to E65) emit blue color when emitting light.

Here, each of the red subpixels E11 to E15, E41 to E45, the green subpixels E21 to E25, E51 to E55, and the blue subpixels E31 to E35, E61 to E65 are gathered into one pixel. To form.

For example, the first red subpixel E11, the first green subpixel E21, and the first blue subpixel E31 are gathered to form a first pixel.

Therefore, each pixel can emit all colors by combining subpixels.

The scan driver 202 sequentially transmits scan signals to the pixels E11 to E65 through the scan lines S1 to S5.

The data storage unit 204 sequentially stores algibi data (RGB data) input from the outside.

In detail, the data storage unit 204 stores the Algibi data in latches therein by using a shift register.

The discharge unit 206 includes a discharge control unit 212 and a discharge execution unit 214.

The discharge control unit 212 receives the ALGBI data from the data storage unit 204 and transmits control signals to the discharge execution unit 214 according to the received ALGBI data.

The discharge execution unit 214 is connected to the data lines D1 to D6 and discharges the data lines D1 to D6 to a predetermined level according to the control signals transmitted from the discharge control unit 212.

However, the discharge execution unit 214 may include the first sub data lines D1 and D4, the second sub data lines D2 and D5, and the third sub data lines D3 and D6 according to the control signals. Discharge to different levels. Detailed description thereof will be described below with reference to the accompanying drawings.

The precharge unit 208 precharges the data lines D1 to D6 according to the ALG ratio data provided from the data storage unit 204.

The data driver 210 provides data signals to the precharged data lines D1 to D6 according to the AlGeB data provided from the data storage unit 204.

That is, the data driver 210 charges the data lines D1 to D6 by providing the data currents corresponding to the Algivy data to the data lines D1 to D6.

FIG. 2B is a circuit diagram illustrating the discharge part of FIG. 2A according to an exemplary embodiment of the present invention, and FIG. 2C is a diagram illustrating light emission efficiency of each subpixel.

Referring to FIG. 2B, the discharge controller 212 includes a connection controller 216, a green discharge controller 218, and a blue discharge controller 220.

The discharge execution unit 214 may include a plurality of zener diodes respectively connected to the first sub data lines D1 and D4, the second sub data lines D2 and D5, and the third sub data lines D3 and D6. Include.

In addition, the discharge execution unit 214 includes a first switching unit 222, a second switching unit 224, and a third switching unit 226.

The green discharge control unit 218 provides the first control signal GC1 or GC2 to the first switching unit 222 according to the AlGeB data provided from the data storage unit 204.

As a result, only one of the switches SW1 and SW2 of the first switching unit 222 is turned on.

When the first switch SW1 is turned on, the second sub data lines D2 and D5 are discharged to 3.5V.

On the other hand, when the second switch SW2 is turned on, the second sub data lines D2 and D5 are discharged to 3.7V.

The blue discharge control unit 220 provides the second control signal BC1 or BC2 to the second switching unit 224 according to the Algi ratio data provided from the data storage unit 204.

As a result, only one of the switches SW3 and SW4 of the second switching unit 224 is turned on.

When the third switch SW3 is turned on, the third sub data lines D3 and D6 are discharged to 2.7V.

On the other hand, when the fourth switch SW4 is turned on, the third sub data lines D3 and D6 are discharged to 3.0V.

As described above, the data lines D1 to D6 are discharged to different levels for each sub data line, and the reason thereof will be described below with reference to FIG. 2C.

2B and 2C, the red subpixels E11 to E15, E41 to E45, and the second sub data lines D2 and D5 corresponding to the first sub data lines D1 and D4, respectively. The green subpixels E21 to E25, E51 to E55 and the blue subpixels E31 to E35 and E61 to E65 corresponding to the third sub data lines D3 and D6 have different luminance with respect to the same current. Has characteristics.

That is, the luminous efficiency of the red subpixels E11 to E15, E41 to E45, the green subpixels E21 to E25, E51 to E55, and the blue subpixels E31 to E35, E61 to E65 are different.

For example, when the same data current is applied to the data lines D1 to D6, the red subpixels E11 to E15 and E41 to E45 generate luminances of 100 candelas and the green subpixels E21 to D6. E25 and E51 to E55 generate 80 candelas, and the blue sub-pixels E31 to E35 and E61 to E65 can generate 90 candelas.

Therefore, the discharge part 206 of the organic electroluminescent device of the present invention is the second and third corresponding to the green subpixels E21 to E25, E51 to E55 and the blue subpixels E31 to E35, E61 to E65. When the sub data lines D2, D3, D5, and D6 are discharged, the sub data lines D2, D3, D5, and D6 are discharged to a level higher than that of the first sub data lines D1 and D4.

As a result, the luminance which differs for each subpixel is compensated.

For example, the first sub data lines D1 and D4 are discharged to 0V, the second sub data lines D2 and D5 are discharged to 3.5V, and the third sub data lines D3 and D6 are discharged. Discharge to 2.7V. Here, the discharge unit 206 according to the embodiment of the present invention controls the discharge levels by using zener diodes.

That is, when the second and third sub data lines D2, D3, D5, and D6 are discharged, the second and third sub data lines D2, D3, D5, and D6 are the first sub data lines D1. Unlike D4), a predetermined amount of charge is charged.

Therefore, when the same data current is applied to the data lines D1 to D6, the second and third sub data lines D2, D3, D5, and D6 retain a predetermined amount of electric charge even though their luminance characteristics are deteriorated. Since the battery is being charged, the same luminance as those of the first sub pixels E11 to E15, E41, and E45 may be generated.

That is, all the sub pixels E11 to E65 generate the same luminance with respect to the same data current.

Hereinafter, the reason why a plurality of discharge levels are set for the same sub data lines will be described with reference to the blue sub pixels as an example.

Referring back to FIG. 2C, when a small data current is applied to the third sub data lines D3 and D6, that is, the blue sub pixels E31 to E35 and E61 to E65 are in the low luminance region (B part). In the case of emitting light, the blue subpixels E31 to E35 and E61 to E65 have nonlinear light emission characteristics.

In detail, when the blue subpixels E31 to E35 and E61 to E65 emit light in the low luminance region (part B), the blue subpixels E31 to E35 and E61 to E65 are shown in FIG. 2C. Similarly, light is emitted at less luminance than desired luminance.

Therefore, in the organic electroluminescent device of the present invention, the discharging unit 206 has blue subpixels E31 to E35 and E61 to E65 to a level higher than the discharge level in the high luminance region in order to compensate for the luminance characteristic in the low luminance region. ) Is discharged.

In detail, the blue discharge controller 220 detects the luminance regions of the blue subpixels E31 to E35 and E61 to E65 through the Algivy data provided from the data storage 204.

When the blue subpixels E31 to E35 and E61 to E65 emit light in the high luminance region, the blue discharge controller 220 transmits the second control signal BC1 to the discharge execution unit 214 to transmit the third switch SW3. Turn on). Here, the fourth switch SW4 maintains an off state.

As a result, the third sub data lines D3 and D6 are discharged to 2.7V.

On the other hand, when the blue subpixels E31 to E35 and E61 to E65 emit light in the low luminance region, the blue discharge controller 220 transmits the second control signal BC2 to the discharge execution unit 214 to generate the first sub-pixels. 4 Turn on the switch SW4. Here, the third switch SW3 maintains the off state.

As a result, the third sub data lines D3 and D6 are discharged to 3.0V.

That is, the third data lines D3 and D6 charge more charge in the low luminance region than in the high luminance region by discharge, that is, the luminance is compensated in the low luminance region. Accordingly, the third data lines D3 and D6 may emit light with desired luminance even in a low luminance region by the luminance compensation.

In the above, the discharge level is set to two, but may be set to three or more.

In addition, although the discharge level corresponding to the first data lines D1 and D4 is one in FIG. 2B, a plurality of discharge levels may be set.

The connection control unit 216 transmits a third control signal to the third switching unit 226 according to the ALGBI data provided from the data storage unit 204.

As a result, the third switching unit 226 switches the connection between the discharge execution unit 214 and the data lines D1 to D6.

In detail, the connection controller 216 transmits a third control signal to the third switching unit 226 when the data lines D1 to D6 are to be discharged.

As a result, the switches of the third switching unit 226 are turned on, so that the zener diodes and the data lines D1 to D6 are connected.

Subsequently, when the discharge is completed, the connection controller 216 transmits a third control signal to the third switch 226 to turn off all the switches of the third switch 226.

In other words, in the organic electroluminescent device of the present invention, since the discharge unit 206 compensates for luminance characteristics for each subpixel, the subpixels E11 to E65 can generate the same luminance for the same data current.

In addition, since the discharge unit 206 compensates for the sub data lines in the low luminance region, the sub pixels corresponding to the sub data lines may emit light with desired luminance.

Hereinafter, the organic electroluminescent element driving method of the present invention will be described in detail.

The data storage unit 204 stores algibi data sequentially input.

For example, the data storage unit 204 stores the first algibi data and the second algibi data sequentially input.

Subsequently, the precharge unit 208 precharges the data lines D1 to D6 by providing a precharge current to the data lines D1 to D6 according to the first ALG ratio data.

Subsequently, the data driver 210 provides data signals corresponding to the first ALG ratio data, that is, data current, to the data lines D1 to D6.

As a result, the sub-pixels E11 to D65 emit light with luminance corresponding to the first Algi ratio data.

Subsequently, the data storage unit 204 provides the first ALG ratio data and the second ALG ratio data to the discharge controller 212.

Subsequently, the green discharge control unit 218 and the blue discharge control unit 220 may control the green subpixels E21 to E25, E51 to E55 and the blue subpixels E31 to E35, E61 through the second RG ratio data. It is determined whether E65) emits light in the low luminance region.

For example, it is assumed that the green subpixels E21 to E25 and E51 to E55 and the blue sub pixels E31 to E35 and E61 to E65 emit light in the low luminance region.

In this case, the green discharge controller 218 and the blue discharge controller 220 transmit the first and second control signals to the discharge execution unit 214 to turn on the second and fourth switches SW2 and SW4.

Subsequently, the connection controller 216 turns on the switches of the third switching unit 226 by transmitting a third control signal to the third switching unit 226 according to the first ALG ratio data.

As a result, the charges charged in the data lines D1 to D6 are discharged to the discharge levels, respectively.

When the discharge is completed, the connection controller 216 transmits a third control signal to the third switching unit 226 to turn off the switches of the third switching unit 226.

Subsequently, the precharge unit 208 precharges the data lines D1 to D6 according to the second ALG ratio data.

Subsequently, the data driver 210 provides data currents corresponding to the second ALG ratio data to the data lines D1 to D6.

As a result, the sub-pixels E11 to D65 emit light with luminance corresponding to the second Algi ratio data.

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

As described above, since the organic EL device and the method of driving the same according to the present invention set different discharge levels for each subpixel, the subpixels can generate the same luminance for the same data current.

In addition, the organic EL device and the method of driving the same according to the present invention compensate for the sub data lines in the low luminance region, and thus, there is an advantage in that the sub pixels corresponding to the sub data lines emit light with a desired luminance.

Claims (11)

A panel having a plurality of subpixels formed in light emitting regions where the data lines and the scan lines intersect and including red subpixels, green subpixels, and blue subpixels; A data storage unit for storing algibi data input from the outside; And First sub data lines corresponding to red sub pixels among the data lines, second sub data lines corresponding to the green sub pixels, and the blue sub pixels among the data lines according to the AlGeB data provided from the data storage unit. And a discharge unit configured to discharge the third sub data lines corresponding to different levels. The organic light emitting diode of claim 1, wherein the discharge part divides some of the sub data lines of the sub data lines into a high luminance region and a low luminance region to discharge to different levels according to the regions. The method of claim 2, wherein the discharge unit, A discharge controller for generating a control signal corresponding to the Algivy data provided from the data storage unit; And And a discharge execution unit configured to discharge the data lines according to a control signal generated from the discharge control unit. The organic light emitting diode of claim 3, wherein the discharge execution unit comprises a plurality of zener diodes connected to the sub data lines. The method of claim 3, wherein the discharge execution unit, A first zener diode connected to the first sub data lines; Second zener diodes connected to the second sub data lines and connected in parallel to each other; And And third Zener diodes connected to the third sub data lines and connected in parallel to each other. The organic light emitting diode of claim 5, wherein the second zener diodes have different voltages, and the third zener diodes have different voltages. The method of claim 5, wherein the discharge control unit, A connection controller which switches a connection between the discharge execution unit and the data lines according to the Algivy data; A green discharge controller for switching the second zener diodes in accordance with the Algivy data; And And a blue discharge control unit configured to switch the third zener diodes according to the Algivy data. The method of claim 1, wherein the organic electroluminescent device, A scan driver for providing scan signals to the data lines, respectively; A precharge unit for precharging the data lines according to the AlGeB data provided from the data storage unit; And And a data driver for respectively providing data signals to the data lines according to the AlGeeB data provided from the data storage unit. A method of driving an organic electroluminescent device formed in light emitting regions where data lines and scan lines intersect, and comprising a plurality of sub pixels having red sub pixels, green sub pixels, and blue sub pixels. Providing the data lines with a first data current corresponding to first algibi data input from the outside; And First sub data lines corresponding to red subpixels of the data lines and second sub data corresponding to the green subpixels according to the first Algibi data and the second Algibi data input thereafter. And discharging lines and third sub data lines corresponding to the blue sub pixels to different levels. 10. The method of claim 9, wherein discharging to different levels comprises: Selecting a discharge level for each sub data line according to the second ALG ratio data; And And discharging the data lines to the selected discharge levels for each of the sub data lines according to the first ALG ratio data. The method of claim 10, wherein the organic electroluminescent device driving method is Precharging the data lines according to the second Algivy data; And And providing a second data current corresponding to the second Algivy data to the data lines.

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