KR100649559B1 - ESD protection device and organic light emitting display device having same - Google Patents

Abstract

A plurality of scan lines for transmitting a selection signal, a plurality of data lines for transmitting a data signal, a plurality of pixels respectively connected to the scan line and the data line, and generating and applying the selection signal to a corresponding scan line A scan driver and a data driver for generating the data signal and applying the data signal to a corresponding data line;

At least one of the driving units is connected to a resistance region formed between a pad receiving an external signal, and the resistance region is formed by varying a resistance value corresponding to a component of the driving unit.

Organic, OLED, Data Line, Scan Line, Driver, ESD, Resistance

Description

ESD prevention device and organic electroluminescent display device having the same {ESD PROTECTION DEVICE AND ORGANIC ELECTRO LUMINESCENCE DISPLAY DEVICE USING THE SAME}

1 is a schematic diagram illustrating an organic light emitting display device according to an exemplary embodiment of the present invention.

2 is a schematic perspective view of an organic light emitting display device according to an exemplary embodiment of the present invention.

3 is a schematic diagram illustrating the configuration of an ESD protection device for a driving unit according to an embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting display device, and more particularly, to a structure for preventing an electrostatic discharge (hereinafter, referred to as ESD for convenience) to a driving unit of an organic light emitting display device.

An organic electroluminescent display is commonly referred to as EL for convenience. A display device is a self-luminous display that electrically excites fluorescent and / or phosphorescent organic compounds to emit light, and can be driven at a low voltage. It is a display that can easily solve the drawbacks pointed out as a problem in the liquid crystal display device, such as a wide viewing angle, a fast response speed, has attracted attention as a next-generation display, in particular, a display for mobile.

In the organic EL display device, an organic light emitting layer having a predetermined pattern is formed on glass or other transparent insulating substrate, and positive and negative electrode layers are formed on and under the organic light emitting layer to apply a driving voltage to the organic light emitting layer. The organic light emitting layer is formed of an organic compound.

In the organic EL display device having such a basic configuration, as the anode and cathode voltages are applied to the electrodes, holes injected from the electrode to which the anode voltage is applied are moved to the organic light emitting layer via the hole transport layer, and the electrons are The cathode is injected into the organic light emitting layer through the electron transport layer from the electrode. As a result, electrons and holes are recombined in the organic light emitting layer to generate excitons, and the organic material of the organic light emitting layer emits light as the excitons change from the excited state to the ground state, thereby realizing a desired image. Will be.

The organic light emitting layer may be driven by a simple matrix method and an active matrix method using a thin film transistor (TFT) or a MOSFET. The simple matrix method forms an anode and a cathode on a substrate to be orthogonal and selects a line, whereas an active driving method connects a thin film transistor to each indium tin oxide (ITO) pixel electrode and is connected to a gate of the thin film transistor. Drive in accordance with the voltage held by. At this time, the voltage is divided into a voltage programming method and a current programming method according to the type of a signal applied to write and maintain a voltage in the capacitor.

On the other hand, in the conventional organic EL display device, in order to prevent the internal circuits of the driving units from being damaged by the ESD phenomenon generated in the input line of the data driver 200 or the scan driver 300, a protection circuit is usually provided. I put it.

The protection circuit is typically formed by forming a resistor between each of the driving units and a pad for allowing an external signal to be input to the driving unit, and the resistance of the ESD pulse is inputted when the pulse of the ESD is input through the pad. The high current is brought down so that the internal circuitry of the driver can be protected.

By the way, in the conventional ESD protection circuit for organic EL display devices, the value of the above-mentioned resistance component is made constant without considering the characteristics of each component (for example, CLK, SP, etc.) constituting the internal circuit of the driver. In this case, the signal frequency of the component may not be adequately responded, and thus, the overall ESD protection efficiency of the driver may be reduced, and further, the performance of the driver may be deteriorated, thereby degrading the function of the organic EL display device connected thereto. .

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide an organic EL display device in which a configuration of an ESD protection circuit for a drive unit of an organic EL display device is formed corresponding to the configuration characteristics of the drive unit. .

In the organic EL display device according to the present invention,

A plurality of scan lines for transmitting a selection signal, a plurality of data lines for transmitting a data signal, a plurality of pixels respectively connected to the scan line and the data line, and generating and applying the selection signal to a corresponding scan line A scan driver and a data driver for generating the data signal and applying the data signal to a corresponding data line;

At least one of the driving units is connected to a resistance region formed between a pad receiving an external signal, and the resistance region is formed by varying the resistance value corresponding to the component of the driving unit.

The resistance region may be formed of a plurality of resistors that are individually connected to the plurality of pads and electrically connected to the component of the driving unit, and the resistors may be formed to have at least two different sizes.

The resistance region may be formed at an input terminal of the driving unit.

In addition, the ESD protection device according to the present invention includes a plurality of driving units electrically connected to the organic light emitting display panel and applying a signal required for driving the organic light emitting display panel, and a pad for applying an external signal to the driving unit. And a resistive region formed at the resistive region, wherein the resistive region is formed by varying the resistance value corresponding to the component of the driving unit.

Hereinafter, an embodiment for clarifying the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram schematically showing an organic EL display device according to the present embodiment. As shown, a conventional organic EL display device includes an organic EL display panel 100, a data driver 64, and a scan driver 66.

The organic EL display panel 100 includes a plurality of data lines D1 to Dm extending in a column direction, and a plurality of scan lines S1 to Sn extending in a row direction intersecting the data lines D1 to Dm. ) And an organic EL element 40 disposed in a pixel region formed by crossing the data lines D1 -Dm and the scan lines S1 -Sn, and a pixel driving element for driving the organic EL element 40 ( 50).

In the above, the organic EL element 40 includes an organic EL layer and an anode electrode and a cathode electrode disposed with the organic EL layer interposed therebetween, and the pixel driving element 50 includes at least two transistors 52, 54, a capacitor 56 electrically connected to the transistor, wherein the transistors 52 and 54 are drive transistors for controlling a current flowing to the organic EL element 40 according to a voltage applied to a gate ( 54 and two switching transistors 52 which transfer an image signal applied to the data line to the driving transistor 52 in response to a selection signal.

In this case, the data driver 64 generates a data signal and applies it to the data lines D1 to Dm, and the scan driver 66 generates a selection signal and applies it to the scan lines S1 to Sn. Do it.

When the organic EL display device is configured as a substantial device, as shown in Fig. 2, the organic EL element 40 is formed between two substrates 60 and 62, and the substrates 60 and 62 are formed. Each of the driving units 64 and 66 may be electrically connected to any one of substrates 62).

Here, each of the driving units 64 and 66 may include driving ICs 64b and 66b mounted on the flexible printed circuit boards FPCBs 64a and 66a, and the driving units 64 and 66 may be controller integrated circuits. 68 and 70 may be electrically connected to the mounted circuit boards 72 and 74.

In the organic EL display device, as shown in FIG. 3, the driving units 64 and 66 may be provided with a resistive region in the driving unit 66 (the scan driving unit is illustrated in FIG. 3 as an example). The resistance region 80 is formed between the input pad 82 and the driver 66 provided for inputting an external signal to the driver 66. In this case, the substantial formation of the resistance region 80 may be configured by adjusting the physical properties of the line pattern between the driver 66 and the input pad 82.

Meanwhile, in the present invention, the size of the resistance region 80 is changed in consideration of characteristics of CLK, SP, and the like substantially configuring the driving unit 66.

For example, the resistance R6 of the resistance region 80 corresponding to a signal having a faster driving frequency, such as CLK, is the resistance of the resistance region 8 corresponding to a signal having a slower driving frequency than the CLK, such as SP. It is designed to be smaller than (R4).

That is, in the present invention, when the pulse of the ESD is input through the driving unit 66 through the input pad 82, the high current of the ESD pulse as the resistance region 80 is turned down to Ensure that the internal circuits are protected. In this case, the resistors R1 to R7, which are the respective constituent parts of the resistance region 80, are configured differently according to the characteristics of the constituent parts of the driving part 66 as described above. ESD protection for the whole can be further improved.

In the present embodiment, the driver 66 is described as an example of a scan driver, but the present invention can be applied to not only the scan driver but also the data driver.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

As described above, the organic EL display device according to the present invention is formed by differentially forming a resistance provided to prevent ESD generated in the driving unit corresponding to the signal frequency of the components constituting the driving unit, thereby preventing the ESD effect. By raising it, the driving unit may have an advantage in improving its performance as well.

Claims (6)

A plurality of scan lines carrying a selection signal; A plurality of data lines for transmitting a data signal; A plurality of pixels connected to the scan line and the data line, respectively; A scan driver which generates the selection signal and applies the scan signal to a corresponding scan line; And A data driver for generating the data signal and applying the data signal to a corresponding data line; The driver includes a plurality of pads to which an external signal is applied and a plurality of resistors electrically connected to the pads. And each of the plurality of resistors is formed to have a resistance value increased or decreased in inverse proportion to a frequency magnitude of each of the external signals applied to the pads at different frequencies. delete The method of claim 1, And each of the plurality of resistors is formed at an input terminal of the driving unit. A plurality of driving parts electrically connected to the organic light emitting display panel to apply a signal for driving the organic light emitting display panel;  The driver includes a plurality of pads to which an external signal is applied and a plurality of resistors electrically connected to the pads. And each of the plurality of resistors is formed to have a resistance value increased or decreased in inverse proportion to a frequency magnitude of each of the external signals applied to the pads at different frequencies. delete The method of claim 4, wherein Each of the plurality of resistors are formed in the input terminal of the driving unit.

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