KR20070043101A - Electro luminescent panel, electro luminescent display device having the same and method for driving the same - Google Patents

Abstract

Disclosed are an organic electroluminescent panel, an organic electroluminescent display having the same, and a driving method thereof, which can improve image quality by increasing a charging speed of a data signal.

The organic electroluminescent panel according to the present invention includes a plurality of gate lines, a plurality of data lines arranged to intersect the gate lines, and a plurality of pixel regions defined by the gate lines and the data lines, Adjacent first and second pixel regions are defined by one gate line and a different data line, and each of the first and second pixel regions includes first and second pixel drivers that share the one gate line; And first and second light emitting parts connected to the first and second pixel drivers, respectively, and each of the first and second pixel drivers is connected to first and second data lines.

Organic electroluminescent element, current driving, parasitic capacitance

Description

Organic electroluminescent panel, organic electroluminescent display having same and driving method thereof {Electro luminescent panel, electro luminescent display device having the same and method for driving the same}

1 is a view showing a conventional organic electroluminescent display.

2 is a diagram illustrating an organic light emitting display device according to a first embodiment of the present invention.

3 is a schematic view of the organic electroluminescent panel of FIG. 2.

4 is a diagram illustrating an organic light emitting display device according to a second embodiment of the present invention.

<Brief description of the main parts of the drawing>

102, 202: Organic electroluminescent panel 104, 204: Gate driver

106, 206: Data driver 108, 208: Control unit

110, 210: pixel driver 112, 212: light emitting unit

The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display panel capable of improving image quality by increasing a charging speed of a data signal, an organic light emitting display device having the same, and a driving method thereof. .

As the information society develops, the demand for display devices is increasing in various forms. In response to this, various flat panel display devices such as liquid crystal display (LCD), plasma display panel (PDP), and electro luminescent display (ELD) have been studied, and some of them have already been used as display devices in various devices.

The organic electroluminescent display (ELD) is a display device that electrically excites fluorescent organic compounds to emit light. The organic electroluminescent display (ELD) can display an image by voltage driving or driving current of a plurality of organic light emitting cells. The organic light emitting cell has a multilayer structure including an anode, an organic thin film (EML), an electron transport layer (ETL), a hole transport layer (HTL), and a cathode, and also a separate layer as necessary. An electron injecting layer (EIL) and a hole injecting layer may be further included.

1 illustrates a conventional organic light emitting display device.

As shown in FIG. 1, a conventional organic electroluminescent display includes an organic electroluminescent panel 2 in which a plurality of gate lines GL0 to GLn and data lines DL1 to DLm are arranged to display a predetermined image; The gate driver 4 driving the gate lines GL0 to GLn, the data driver 6 driving the data lines DL1 to DLm, and the gate driver 4 and the data driver 6 are controlled. The control unit 8 is included.

A plurality of gate lines GL0 to GLn and data lines DL1 to DLm are arranged in the organic electroluminescent panel 2, and transistors that act as driving devices and transistors (not shown) at the intersections thereof. A pixel driver 10 including (not shown) is formed. The pixel driver 10 displays a predetermined image on the organic electroluminescent panel 2.

In addition, the organic light emitting panel 2 is formed with a light emitting part 12 connected to the pixel driver 10 to generate predetermined light. The light emitter 12 is connected to the pixel driver 10 and controlled by the pixel driver 10.

The pixel driver 10 includes a switching thin film transistor (not shown) having a switching function and a predetermined driving thin film transistor (not shown) controlled and driven by the switching thin film transistor. In addition, the light emitting unit 12 is provided with an organic electroluminescent device (not shown, OLED) connected to the driving thin film transistor to emit light by a current supplied from the driving thin film transistor.

In the organic light emitting display device configured as described above, the gate lines GL0 to GLn and the data lines DL1 to DLm are alternately arranged to define a pixel area.

Since a plurality of gate lines GL0 to GLn and data lines DL1 to DLm are arranged at the intersections in each pixel area, parasitic capacitances are formed at intersections of the gate lines GL0 to GLn and data lines DL1 to DLm. This happens. The parasitic capacitance increases as the organic electroluminescent panel 2 increases in size.

As mentioned above, the organic light emitting display device may be driven by a current driving method. The organic light emitting display device driven by the current driving method is significantly sensitive to the parasitic capacitance. In contrast, an organic light emitting display device driven by a voltage driving method is hardly affected by the parasitic capacitance.

Therefore, the organic light emitting diode display driven by the current driving method affects the current flowing through the organic light emitting diode OLED due to the parasitic capacitance. That is, since the data signal supplied to the data lines DL1 to DLm through the data driver 6 is a current, the data lines DL1 to DLm and the gate lines GL0 to GLn cross each other. Parasitic doses are affected.

The data signal is supplied to the pixel driver 10 provided on the organic electroluminescent panel 2 through the data lines DL1 to DLm so that the switching thin film transistors of the pixel driver 10 are turned on. (turn-on).

In addition, when the switching thin film transistors are turned on, the organic light emitting diode OLED connected to the driving thin film transistors of the pixel driver 10 emits light. The organic light emitting diode OLED generates light having different luminance according to the intensity of the current supplied from the driving thin film transistor.

When the current supplied to the data lines DL1 to DLm is affected by the parasitic capacitance, the turn-on time of the thin film transistors included in the pixel driver 10 is affected, and the organic It also affects the intensity of light generated by the EL.

In addition, as the organic electroluminescent panel 2 is enlarged, the lengths of the gate lines GL0 to GLn and the data lines DL1 to DLm increase, thereby increasing the load of the respective lines. The parasitic capacitance affects the charging speed and the switching time t of predetermined switching thin film transistors provided in the pixel driver 10.

The switching time t of the predetermined switching thin film transistors is proportional to the parasitic capacitance.

In this case, t is the switching time of the predetermined switching thin film transistor, C is the parasitic capacitance, ΔV is the amount of voltage change to be stored in the storage capacitor and i is the amount of current flowing through the data line.

If the values of i and ㅿ V are fixed, the switching time t of the predetermined switching thin film transistors is determined by the parasitic capacitance. When the parasitic capacitance C decreases, the switching time t of the predetermined switching thin film transistors decreases. When the parasitic capacitance C increases, the switching time t of the predetermined switching thin film transistors increases. .

Therefore, as the organic electroluminescent panel 2 becomes larger, the parasitic capacitance increases, so that the switching time t of the predetermined switching thin film transistors increases. When the switching time t of the predetermined switching thin film transistors is increased, the speed at which the data signal is charged decreases, thereby causing an unwanted image to be displayed on the organic EL panel 2.

That is, the parasitic capacitance causes a problem such as deterioration in image quality as the switching time t of a predetermined switching thin film transistor increases and the speed at which the data signal is charged decreases.

It is an object of the present invention to provide an organic electroluminescent panel, an organic electroluminescent display having the same, and a driving method thereof, which can improve image quality by changing the structure of the organic electroluminescent panel to increase the charging speed of a data signal. .

An organic electroluminescent panel according to an embodiment of the present invention for achieving the above object is defined by a plurality of gate lines, a plurality of data lines arranged to intersect the gate line, each of the gate lines and each data line A plurality of pixel regions, wherein adjacent first and second pixel regions are defined by one gate line and a different data line, and each of the first and second pixel regions shares the one gate line. And first and second light emitting parts connected to the first and second pixel drivers, respectively, and the first and second pixel drivers are connected to the first and second data lines, respectively. do.

In the organic light emitting display according to the embodiment of the present invention for achieving the above object, the first and second pixel areas of the plurality of pixel areas defined by the plurality of gate lines and data lines are one gate line and the first and First and second pixel drivers defined by a second data line and connected to the gate line are connected to the first and second pixel areas, respectively, and the first and second pixel drivers are first and second, respectively. And an organic electroluminescent panel connected to the second light emitting unit, a gate driver supplying a gate signal to the gate line, and a data driver supplying a data signal to the data line.

An organic electroluminescent display device driving method according to an embodiment of the present invention for achieving the above object, an organic electroluminescent panel having a plurality of block regions, a gate driver for supplying a gate voltage for driving each block region, An organic electroluminescent display device comprising a data driver for supplying a data signal for displaying each block area, the organic light emitting display device comprising the steps of: a) scanning one gate line in response to the gate voltage; and b) the data signal. In response to the step of displaying a block area including pixel areas sharing the gate line among the plurality of block areas, and c) performing steps a) and b) repeatedly for one frame. Include.

2 is a diagram illustrating an organic light emitting display device according to a first embodiment of the present invention.

As shown in FIG. 2, in the organic light emitting display according to the first exemplary embodiment, a plurality of gate lines GL0 to GLn / 2 and data lines DL1 to DL2m defining a pixel area are arranged. An organic electroluminescent panel 102 displaying a predetermined image, a gate driver 104 driving the plurality of gate lines GL0 to GLn / 2, and a plurality of data lines DL1 to DL2m And a control unit 108 that controls the data driver 106 and the gate driver 104 and the data driver 106.

As shown in FIG. 3, the organic electroluminescent display panel 102 includes a display area A in which a predetermined image is displayed and a driving circuit, in particular, the gate driver 104, the data driver 106, and the controller 108. It is divided into a non-display area B in which the back is located.

The organic light emitting display panel 102 includes a plurality of gate lines GL0 to GLn / 2 and data lines DL1 to DL2m defining pixel regions, and predetermined thin film transistors (not shown) at the intersection thereof. The pixel driver 110 is provided.

The pixel driver 110 displays a predetermined image on the organic electroluminescent panel 102. In addition, the organic light emitting panel 102 is formed with a light emitting unit 112 connected to the pixel driver 110 to generate a predetermined light. The light emitter 112 is connected to the pixel driver 110 and controlled by the pixel driver 110.

The pixel driver 110 includes a plurality of transistors (not shown). In detail, the pixel driver 110 includes a switching thin film transistor performing a switching role and a driving thin film transistor performing a driving role.

The pixel driver 110 is connected to the gate lines GL0 to GLn / 2, and is turned on when a predetermined gate voltage Vgate is supplied from the gate lines GL0 to GLn / 2. Begin controlling 112. As described above, the pixel driver 110 includes switching thin film transistors, driving thin film transistors, and a storage capacitor Cst.

The pixel driver 110 is electrically connected to the data lines DL1 to DL2m so that when a predetermined gate voltage Vgate is supplied from the gate lines GL0 to GLn / 2, the pixel driver 110 is connected to the data lines DL1 to DL2m. The data signal is supplied.

The data signal is stored in the storage capacitor Cst and stored in the storage capacitor Cst until the gate voltage Vgate is supplied to the corresponding gate line in the next frame. The light emitter 112 is controlled by a data signal stored in the storage capacitor Cst.

The light emitting unit 112 includes an organic light emitting diode (OLED) (not shown). Since the organic light emitting diode (OLED) is a current device, the amount of light emitted is determined according to the current intensity.

The gate driver 104 sequentially supplies a predetermined gate voltage Vgate to the gate lines GL0 to GLn / 2 according to a gate control signal supplied from the controller 108. The number of gate lines GL0 to GLn / 2 is about half of the number of conventional gate lines GL0 to GLn in FIG. 1 as mentioned above.

In addition, a plurality of shift registers (not shown) are provided in the gate driver 104. The plurality of shift registers are provided to correspond to the gate lines GL0 to GLn / 2. That is, the plurality of shift registers are provided according to the number of the gate lines GL0 to GLn / 2.

As a result, the number of shift registers provided in the gate driver 104 is about half of the number of shift registers provided in the conventional gate driver (4 in FIG. 1). This increases the effective area of the gate driver 104.

The gate driver 104 is positioned in the non-display area B of the organic electroluminescent panel 102. As the overall size of the gate driver 104 decreases, the margin of the gate driver 104 is reduced. This increases to reduce the non-display area (B).

The data driver 106 supplies a predetermined data signal to the data lines DL1 to DL2m according to the data control signal supplied from the controller 108. In this case, the number of the data lines DL1 to DL2m is about twice the number of the conventional data lines DL1 to DLm of FIG. 1 as mentioned above.

The controller 108 generates a gate control signal for controlling the gate driver 104 and a data control signal for controlling the data driver 106 by using a predetermined synchronization signal and a clock signal supplied from a system (not shown). do.

In this case, the gate control signal is a signal for driving the gate lines GL0 to GLn / 2 which are reduced by half compared to the conventional, and the data control signal is for driving the data lines DL1 to DL2m that are about twice as large as the conventional method. It is a signal.

In the organic electroluminescent display device configured as described above, the first gate line GL1 is arranged on the organic electroluminescent panel 102 in a manner shared in two adjacent pixel regions.

Referring to the region C shown in FIG. 2, the first and second pixel regions P1 and P2 share the first gate line GL1 and are simultaneously driven.

That is, the pixel driver 110 provided in the first pixel region P1 and the pixel driver 110 provided in the second pixel region P2 are connected to the first gate line GL1. When a predetermined gate voltage Vgate is supplied to the first gate line GL1, the first and second pixel regions P1 and P2 are simultaneously driven.

When the first pixel region P1 is driven, the pixel driver 110 provided in the first pixel region P1 is connected to the first data line DL1 and thus data from the first data line DL1. Receive a signal. The data signal is stored in a storage capacitor Cst provided in the pixel driver 110. The light emitting unit 112 provided on the first pixel area P1 emits light due to the data signal stored in the storage capacitor Cst.

At the same time, when the second pixel region P2 is driven, the pixel driver 110 provided in the second pixel region P2 is connected to the second data line DL2 and thus, from the second data line DL2. A predetermined data signal is supplied. The data signal is stored in a storage capacitor Cst provided in the pixel driver 110. The light emitting unit 112 provided on the second pixel region P2 emits light due to the data signal stored in the storage capacitor Cst.

Here, the pixel driver 210 provided in the first pixel region P1 is connected to a second data line DL2, and the pixel driver 210 provided in the second pixel region P2 is a first data line. It may be connected to the DL1.

As a result, the first and second pixel regions P1 and P2 are simultaneously driven because one gate line, that is, the first gate line GL1 is shared.

In this case, the organic electroluminescent panel 102 is configured such that a plurality of pixel regions adjacent to one gate line form a block region.

That is, the organic electroluminescent panel 102 is divided into a plurality of block regions, and as described above, the plurality of block regions are formed in such a manner that adjacent pixel regions share one gate line.

As a result, parasitic capacitance caused by the intersection of the gate lines GL0 to GLn / 2 and the data lines DL1 to DL2m may be reduced compared to the conventional organic light emitting display.

As mentioned above, the organic light emitting display device is driven by a current driving method, and thus, the parasitic capacitance is greatly affected. Since the data signal supplied from the data driver 106 to the data lines DL1 to DL2m is a current, a parasitic capacitance generated by crossing the data lines DL1 to DL2m and the gate lines GL0 to GLn / 2 at the intersection. This may distort the current.

Therefore, in order to prevent this, the number of gate lines GL0 to GLn / 2 is reduced by about half in the organic electroluminescent display of the present invention.

The parasitic capacitance affects the switching time t of the switching thin film transistors provided in the pixel driver 110, which is the same as described above, and thus a detailed description thereof will be omitted.

The switching time t of the switching thin film transistors among the predetermined thin film transistors provided in the pixel driver 110 is proportional to the parasitic capacitance. In particular, the switching time t of the switching thin film transistors is particularly closely related to the parasitic capacitance generated between the data lines DL1 to DL2m and the gate lines GL0 to GLn / 2.

In this case, t is the switching time of the switching thin film transistor, C is the parasitic capacitance, ΔV is the amount of voltage change to be stored in the storage capacitor and i is the amount of current flowing through the data line.

If the values of i and iV are fixed, the switching time t of the switching thin film transistors decreases when the parasitic capacitance is reduced.

As the switching time t of the switching thin film transistors decreases, the time for which a predetermined data signal supplied from the data lines DL1 to DL2m is charged to the storage capacitor Cst is decreased and the charging speed is increased. .

As the speed at which the predetermined data signal is charged in the storage capacitor Cst increases, a desired image may be displayed on the organic electroluminescent panel 102.

In addition, as the gate line is reduced in half, as the plurality of shift registers corresponding to the gate line is reduced, the overall size of the gate driver 104 is reduced. As a result, the non-display area (B of FIG. 3) in which the gate driver 104 is located is reduced. That is, as the area of the gate driver 104 decreases, the non-display area on which the screen is not displayed on the organic electroluminescent panel 102 decreases.

In the organic light emitting display according to the present invention, a switching thin film transistor formed in the pixel area is reduced by reducing the parasitic capacitance generated as the gate line and the data line are alternately arranged as two pixel areas adjacent to one gate line are driven. By increasing the charging speed of the battery, the image quality can be improved by preventing problems such as image quality deterioration caused by the conventional organic light emitting display device.

In addition, the organic light emitting display device according to the present invention can design an organic light emitting panel having a narrow bezel by reducing the driving area of the gate driver.

4 is a diagram illustrating an organic light emitting display device according to a second embodiment of the present invention.

As shown in FIG. 4, in the organic light emitting display according to the second exemplary embodiment, a plurality of gate lines GL0 to GLn / 2 and data lines DL1 to DL2m are arranged to display a predetermined image. An organic electroluminescent panel 202, a gate driver 204 for driving the gate lines GL0 to GLn / 2, a data driver 206 for driving the data lines DL1 to DLm, and the gate The controller 208 controls the driver 204 and the data driver 206.

In the description of the organic light emitting display device, the same description as that of the organic light emitting display device of the first exemplary embodiment will be omitted.

In the organic EL panel 202, a plurality of gate lines GL0 to GLn / 2 and data lines DL1 to DL2m defining a pixel area are arranged, and a pixel driver 210 is formed at an intersection thereof. The pixel driver 210 serves to drive a predetermined image to be displayed on the organic electroluminescent panel 202.

In addition, the organic electroluminescent panel 202 includes a light emitting unit 212 corresponding to the pixel driver 210 to generate predetermined light. The light emitter 212 is connected to the pixel driver 210 and controlled by the pixel driver 210.

As illustrated in region D of FIG. 4, adjacent first and second pixel regions P1 and P2 each share one gate line, that is, the first gate line GL1. The pixel driver 210 provided in the first pixel region P1 and the pixel driver 210 provided in the second pixel region P2 are connected to the first gate line GL1 to be connected to the first gate line. When a predetermined gate voltage Vgate is supplied to GL1, it is driven simultaneously.

In addition, the pixel driver 210 provided in the first pixel region P1 is connected to the first data line DL1, and the pixel driver 210 provided in the second pixel region P2 is second data. It is connected to the line DL2.

Here, the pixel driver 210 provided in the first pixel region P1 is connected to a second data line DL2, and the pixel driver 210 provided in the second pixel region P2 is a first data line. It may be connected to the DL1.

The number of gate lines GL0 to GLn / 2 is the same as the number of gate lines GL0 to GLn / 2 mentioned in the first embodiment of the present invention, and the data lines DL1 to DL2m are also the present invention. It is equal to the number of data lines DL1 to DL2m mentioned in the first embodiment of FIG.

A plurality of shift registers corresponding to the gate lines GL0 to GLn / 2 are provided in the gate driver 204. The number of the plurality of shift registers is about half of the number of shifter registers provided in the conventional gate driver (4 in FIG. 1).

As the gate lines GL0 to GLn / 2 are reduced by half as compared with the related art, the gate drivers 204 as the plurality of shift registers corresponding to the gate lines GL0 to GLn / 2 are correspondingly reduced. ) Will reduce the overall size. As a result, the free margin of the gate driver 204 increases, so that the non-display area (B of FIG. 3) decreases.

That is, as the driving area of the gate driver 204 is reduced, the non-display area (B of FIG. 3) in which no image is displayed on the organic electroluminescent panel 202 is reduced.

In the organic light emitting display according to the present invention, a switching thin film transistor formed in the pixel area is reduced by reducing the parasitic capacitance generated as the gate line and the data line are alternately arranged as two pixel areas adjacent to one gate line are driven. By increasing the charging speed of the battery, the image quality can be improved by preventing problems such as image quality deterioration caused by the conventional organic light emitting display device.

In addition, the organic light emitting display device according to the present invention can design an organic light emitting panel having a narrow bezel by reducing the driving area of the gate driver.

As described above, in the organic light emitting display device according to the present invention, by reducing the number of gate lines, two adjacent pixel regions share one gate line and are simultaneously driven to drive at high speed. As the number of the circuits decreases, the parasitic capacitance generated by crossing the gate lines and the data lines is reduced, thereby increasing the charging speed of the data signal. As a result, it is possible to overcome problems such as deterioration of image quality caused in the conventional organic light emitting display device and to improve image quality. In addition, the organic light emitting display device according to the present invention can design an organic light emitting panel having a narrow bezel by reducing the driving area of the gate driver.

Claims (14)

A plurality of gate lines; A plurality of data lines arranged to intersect the gate lines; A plurality of pixel regions defined by the gate lines and the data lines, Adjacent first and second pixel regions are defined by one gate line and a different data line, and each of the first and second pixel regions includes first and second pixel drivers that share the one gate line; And first and second light emitting parts connected to the first and second pixel driving parts, respectively, and the first and second pixel driving parts are connected to first and second data lines, respectively. . The method of claim 1, And the first and second pixel regions share one gate line and are driven at the same time. The method of claim 1, And the first light emitting part, the first pixel driving part, the second pixel driving part, and the second light emitting part in the order of the organic light emitting panel. The method of claim 1, And the first light emitting part, the first pixel driving part, the second light emitting part, and the second pixel driving part. The method of claim 1, And the first pixel driver is connected to the first data line and the second pixel driver is connected to the second data line. The method of claim 1, And the first pixel driver is connected to the second data line, and the second pixel driver is connected to the first data line. The method of claim 1, Each of the first and second pixel drivers is provided with a predetermined thin film transistor and a storage capacitor. The first and second pixel areas of the plurality of pixel areas defined by the plurality of gate lines and the data lines are defined by one gate line and the first and second data lines. First and second pixel drivers connected to one gate line, each of the first and second pixel drivers connected to the first and second light emitting parts; A gate driver supplying a gate signal to the gate line; And And a data driver for supplying a data signal to the data line. The method of claim 8, And the first light emitting part, the first pixel driving part, the second pixel driving part, and the second light emitting part in the order of the organic light emitting display device. The method of claim 8, And the first light emitting part, the first pixel driving part, the second light emitting part, and the second pixel driving part. The method of claim 8, And the first pixel driver is connected to the first data line and the second pixel driver is connected to the second data line. The method of claim 8, And the first pixel driver is connected to the second data line, and the second pixel driver is connected to the first data line. An organic electroluminescent panel comprising an organic electroluminescent panel having a plurality of block regions, a gate driver for supplying a gate voltage for driving each block region, and a data driver for supplying a data signal for displaying each block region In the display device, a) scanning one gate line in response to the gate voltage; b) displaying a block area including pixel areas sharing the one gate line among the plurality of block areas in response to the data signal; And and c) repeatedly performing the steps a) and b) for one frame. The method of claim 13, And the block area is a plurality of pixel areas sharing the one gate line and connected to different data lines.

Images