KR20060040431A - Organic electo luminescence device for preventing a current overflow - Google Patents

Abstract

An organic electroluminescent device for preventing an overcurrent generated from a power supply unit from being input into a panel unit is disclosed. The organic light emitting device includes an ELIDD current generating unit, a current sensing unit, a switching frequency unit, and a thermistor mounted on the panel unit so that the organic electroluminescent element of the panel unit is not damaged.

Description

Organic Electo Luminescence Device for preventing a current overflow}             

1 is a block diagram schematically illustrating an organic light emitting device according to the related art.

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

3 is a circuit diagram illustrating circuit parts included in an organic light emitting device according to a first embodiment of the present invention.

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

FIG. 5 is a circuit diagram illustrating circuit parts included in an organic light emitting device according to a second exemplary embodiment of the present invention.

The present invention relates to an organic light emitting device, and more particularly, to an organic light emitting device that prevents an overcurrent generated from a power supply unit from being input into a panel unit, so that the organic light emitting device of the panel unit is not damaged by an overcurrent. It is about.

In general, an organic EL device is a flat self-emission display that emits light by applying an electric field to a phosphor coated on a glass substrate or a transparent organic film. Electroluminescence refers to a phenomenon of emitting light when an electric field is applied to a phosphor made of a semiconductor.

Recently, liquid crystal displays (LCDs) and organic light emitting diodes (OLEDs) are used in portable information devices due to their light weight and thinness. The organic light emitting device is attracting attention as a next-generation flat panel display because it has superior luminance and viewing angle characteristics as compared to the liquid crystal display.

In general, in an active matrix organic light emitting device (AMOLED), one pixel includes R, G, and B unit pixels, and each R, G, and B unit pixel includes an EL element. Each EL element has an R, G, B organic light emitting layer interposed between the anode electrode and the cathode electrode to emit light from the R, G, B organic light emitting layer compared to the voltage applied to the anode electrode and the cathode electrode.

1 is a block diagram schematically illustrating an organic light emitting device according to the related art.

Referring to FIG. 1, the conventional organic light emitting diode device 100 includes a power supply unit 110, a memory unit (SSRAM / ROM: 120), a program unit (FPGA: 130), a buffer unit (Buffer: 140), and a driver (Driver). : 150) and a panel unit (Panel: 160).

First, the power supply unit 110 receives source power from a power supply source, steps down, and divides the source power for each internal circuit to deliver a power voltage.

That is, the power supply unit 110 divides the source power into a memory unit 120, a program unit 130, a buffer unit 140, a driving unit 150, and a panel unit 160, and changes the source power to a power supply voltage. It is designed to deliver to the circuit.

Here, the embedded circuits are collectively named as the memory unit 120, the program unit 130, the buffer unit 140, the driving unit 150, and the panel unit 160.

Next, the memory unit 120 is composed of a RAM and a ROM, which stands for Ramdon Access Memory, also called a random access memory. When the power supply voltage is turned off, the stored contents are erased. In addition, ROM stands for Read Only Memory, which is a read-only memory, and its contents remain even when the power supply voltage is turned off. In particular, as the data processing speed of the RAM continues to increase in the organic light emitting device 100 recently, data stored in the memory unit 120 is quickly transferred to the program unit 130.

Next, the program unit (Field Programmable Gate Array) 130 receiving data from the memory unit 120 transmits a command signal and an address signal to the memory unit 120 according to program logic already implanted. signal). That is, the address of the memory unit 120 is designated according to the input command signal and the address signal, and data corresponding to the address is output to the program unit 130. Accordingly, the data received by the program unit 130 is processed by the program logic and transferred to the buffer unit 140.

Hereinafter, data processed and output according to the above-described process will be referred to as a program signal.

Next, the buffer unit 140 is a storage place for storing temporary information, and is used to compensate for a difference in time or information flow rate that occurs when the information is transmitted from one device to another. In addition, the buffer unit 140 is a kind of register, and since it is an internal circuit that makes an address buffer for the transmission of an address, the program signal is temporarily transmitted from the program unit 130 to transmit the program signal. After compensating and adjusting the time, the program signal is transmitted to the driver 150.

Next, the driver 150 amplifies the program signal input from the program unit 130 by using a driving transistor mounted on the driver 150. That is, the driving unit 150 extends the program signal and transfers the program signal to the panel unit 160 so that the organic light emitting diode of the panel unit 170 can be displayed smoothly.

Finally, the program signal amplified by the driving unit 150 is input to the organic light emitting element in the panel unit 160 and displayed.

Problems related to the conventional organic EL device related to the present invention and overcome by the present invention are as follows.

When the power supply unit supplies a power supply voltage to the organic light emitting diode of the panel unit, there is a problem in that the organic light emitting diode is damaged due to an overcurrent.

In order to solve this problem, an ELIDD power generator, a current sensing unit, a switching frequency unit, and a thermistor are mounted on an intermediate line connected to the power unit and the panel unit so that the organic light emitting diode of the panel unit is not damaged by the overcurrent transmitted from the power unit. The subject which has a panel part must go through.

SUMMARY OF THE INVENTION An object of the present invention is to provide an organic light emitting device which includes an ELIDD current generation unit, a current sensing unit, a switching frequency unit and a panel unit on which a thermistor is mounted to prevent overcurrent generated from a power supply unit from being input to the panel unit.

The present invention according to the first embodiment for achieving the above object, the power supply unit for supplying a power supply voltage VDD required for the operation of the panel unit; An ELIDD current generator disposed between the power supply unit and the panel unit to receive a power supply voltage VDD output from the power supply unit to generate a current source ELIDD supplied to the panel unit; A switching frequency unit connected to and disposed with the ELIDD current generation unit and controlling an operation of the ELIDD current generation unit; A panel unit for receiving a current source ELIDD output from the ELIDD current generation unit and displaying a predetermined screen using an organic light emitting element; And a current sensing unit for sensing the current source ELIDD and controlling the operation of the ELIDD current generation unit.

According to a second aspect of the present invention, there is provided a power supply unit for supplying a power supply voltage VDD required for operation of the panel unit. An ELIDD current generator disposed between the power supply unit and the panel unit to receive a power supply voltage VDD output from the power supply unit to generate a current source ELIDD supplied to the panel unit; A switching frequency unit connected to and disposed with the ELIDD current generation unit and controlling an operation of the ELIDD current generation unit; A panel unit including a thermistor for generating an overcurrent ELIDD detection signal so that the organic light emitting diode is not damaged due to an overload of the current source ELIDD output from the ELIDD current generation unit; And a current sensing unit for sensing the current source ELIDD and receiving an overcurrent ELIDD sensing signal to control the operation of the ELIDD current generation unit.

Hereinafter, described in detail with reference to the accompanying drawings of the present invention.

First embodiment

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

Referring to FIG. 2, the organic light emitting device includes a power supply unit 210, an ELIDD current generator 220, a current supervisor 230, a switching frequency unit 240, and a panel unit. (Panel: 250)

First, the ELIDD current generator 220 of the organic light emitting device includes a resonance circuit 300 and a transformer 310. That is, when the power supply voltage VDD transmitted from the power supply unit 210 to the panel unit 250 is excessively applied to the ELIDD current generation unit 220, the organic light emitting diode in the panel unit 250 is caused by the overcurrent ELIDD. Do not damage it.

In addition, the ELIDD current generator 220 receives the resonance control signal detected from the current detector 230 to block the overcurrent ELIDD from being transmitted to the panel 250.

In more detail, the resonant circuit 300 provided in the ELIDD current generation unit 220 may electrically resonate a resonance phenomenon generated when the free vibration frequency and the external force frequency generated by reversible conversion between different energies are very close. As a circuit which arises, it is also called a tuning circuit.

In addition, the resonant circuit 300 is electrically resonated at a specific frequency determined by the values of the coils and capacitors in the electric circuit of the coils and capacitors, and the electrical properties of the coils and capacitors are apparently dissipated so that some quantum inherent It becomes a circuit of electric resistance delivery.

That is, the resonant circuit 300 refers to a circuit that is freely converted between the electrostatic energy of the capacitor (C) and the electromagnetic energy of the inductance (L), the capacitor (C) and the inductance (L) is a series resonant circuit in series and a parallel resonant circuit in parallel. In addition, all the resonance frequencies f0 are represented by [Equation 1].

That is, the unit of the resonant frequency is represented by the inductance L is represented by H (Henry) and the capacitor C is represented by F (farad), the impedance of the external force of the resonant frequency is 0 in series and infinity in parallel. . Therefore, a large current flows at a small voltage in series and a large voltage is obtained at a small current in parallel. In addition, in a tuning circuit such as a radio, a weak current input from an antenna can be selectively brought into a large voltage by writing parallel and adjusting a constant of LC to a frequency of radio waves to be received.

Accordingly, the resonant circuit 300 of the ELIDD current generation unit 220 adjusts the power supply voltage VDD input from the power supply unit 210 to generate an oscillation power that is greater than the power supply voltage VDD to generate the transformer 310. To pass). In addition, when the current source ELIDD delivered to the panel unit 250 is applied in an overcurrent state, the resonant circuit 300 blocks the overcurrent ELIDD according to the resonance control signal transmitted from the current detector 230.

Next, the transformer 310 provided in the ELIDD current generation unit 220 may also be generally referred to as a transformer.

Generally, the transformer includes a power transformer connected to a transmission and distribution line and a coupling transformer used in an electronic circuit. The power transformer can change the voltage applied to the AC circuit, so the power does not change. In addition, the power transformer has a primary winding connected to a power source and a secondary winding connected to a load are wound with the same iron core.

In addition, the iron core is assembled to the required thickness by overlapping the magnetic material of silicon steel sheet, permalloy and ferrite having a thickness of 0.35 mm.

Accordingly, the transformer 310 converts the oscillation power received from the resonant circuit 300 into a current source ELIDD required by the organic light emitting diode of the panel unit 250, thereby converting the organic field of the panel unit 250. Transfer to the light emitting element.

Subsequently, the switching frequency unit 240 is disposed to connect the resonant circuit 300 and the transformer 310 of the ELIDD current generator 220. The switching frequency transmitted from the transformer 310 of the ELIDD current generation unit 220 and the natural vibration frequency present in the switching frequency unit 240 are compared. If the switching frequency and the natural vibration frequency coincide with each other, the switching frequency unit 240 may generate resonance, and the size of the oscillation power delivered from the resonance circuit 300 may be reduced.

Next, the current detector 230 of the organic light emitting device includes a photo coupler 320 and an overcurrent detector 330. That is, the current detector 230 is disposed between the ELIDD current generator 220 and the panel unit 250 to output the current source ELIDD output from the transformer 230 of the ELIDD voltage generator 220 in real time. Watch.

If the current source ELIDD is overloaded and applied to the panel 250, the organic light emitting diode of the panel 250 is damaged. Accordingly, the current detector 230 detects an overcurrent ELIDD, which is a current source ELIDD generated due to an overload, to the panel unit 250 and generates the resonance control signal so that the overcurrent ELIDD is not transmitted to the panel unit 250. do. That is, the resonance control signal is fed back to the resonant circuit 300 of the ELIDD current generator 220 to control the ELIDD current generator 220.

3 is a circuit diagram illustrating circuit parts included in an organic light emitting device according to a first embodiment of the present invention.

Referring to FIG. 3, the switching frequency unit 240 is disposed by connecting the resonant circuit 300 of the ELIDD current generator 220 and the primary winding of the transformer 310. The switching frequency unit 240 compares the switching frequency transmitted from the primary winding of the transformer 310 of the ELIDD current generation unit 220 with the natural vibration frequency present in the switching frequency unit 240. If the switching frequency and the natural vibration frequency coincide with each other, the switching frequency unit 240 may generate resonance, and the size of the overcurrent ELIDD may be reduced.

In addition, the switching frequency unit 240 includes resistors R1 and R2 and capacitors C1 and C2. That is, the capacitor C1 of the switching frequency unit 240 is connected in parallel with the primary winding of the transformer 310 to act as a resonant capacitor. In addition, the natural vibration frequency generated in the capacitor C1 is compared with the switching frequency. If the natural oscillation frequency and the switching frequency coincide with each other, the oscillation power induced by the overcurrent ELVDD is reduced in size through the capacitor C2 and the resistors R1 and R2, and the ELIDD current generation unit ( Feedback to the resonant circuit 300 of 220.

The overcurrent detector 330 has a resistor R3 and an overcurrent control transistor Q1. The resistor R3 is disposed between the input terminal of the panel unit 250 and the drain terminal of the overcurrent control transistor Q1. In FIG. 3, the resistor R3 is connected in series and the resistor R6 and the capacitor C3 are interposed in parallel between the resistor R3 and the base terminal. However, the number of resistors and capacitors may be changed according to the embodiment. May also be appropriately arranged. The value of resistor R3 connected in series can be changed according to the sensed overcurrent level.

In addition, the base terminal and the emitter terminal of the overcurrent control transistor Q1 are disposed to be connected with a zener diode ZD1 and a resistor R7.

When the current source ELIDD, which is the output of the transformer 310, exceeds the threshold voltage or threshold current applied to the resistors R3, R6, and R7, the voltage of the base terminal of the overcurrent control transistor Q1 increases. That is, the transistor Q1 is turned on as the voltage of the base terminal of the transistor Q1 increases. In addition, the photo coupler 320 provided in the current sensing unit 230 recognizes the overcurrent ELIDD transmitted from the transformer 310 to the panel unit 250, and thus is an optical element that is a display element provided in the photo coupler 320. The diode is turned on and emits light.

However, when the current source ELIDD transmitted from the transformer 310 to the panel unit 250 is applied to the normal current source ELIDD, the photodiode of the photo coupler 320 is turned off and the photodiode does not emit light.

In addition, as the overcurrent control transistor Q1 provided in the overcurrent sensing unit 330 is turned on by the overcurrent ELIDD, the light emitting diode is turned on. In addition, the bipolar junction transistor Q2 disposed in the photo coupler 320 is turned on by the turn-on of the light emitting diode to generate a resonance control signal. That is, the resonance control signal is input to control the resonance circuit operation of the ELIDD current generation unit 220. In addition, the resonance circuit 300 in which the resonance control signal is received may have a pulse width of the oscillation power so that the overcurrent ELIDD output from the ELIDD current generation unit 220 is not transmitted to the organic light emitting diode of the panel unit 250. Adjust or block in advance so that the oscillating power is not delivered to the transformer 310.

Second embodiment

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

Referring to FIG. 4, the organic light emitting device includes a power supply unit 210, an ELIDD current generator unit 220, a current supervisor unit 230, a switching frequency unit 240, and a thermistor. It has a panel with a panel (250 with thermistor).

First, the ELIDD current generator 220 of the organic light emitting device includes a resonance circuit 300 and a transformer 310. That is, the ELIDD current generation unit 220 is damaged due to an overcurrent of the organic light emitting device in the panel unit 250 when the power supply voltage VDD transmitted from the power supply unit 210 to the panel unit 250 is excessively applied. Do not let.

In addition, the ELIDD current generator 220 receives the resonance control signal detected from the current detector 230 and blocks the overcurrent from being transmitted to the panel 250.

In more detail, the resonant circuit 300 provided in the ELIDD current generation unit 220 may electrically resonate a resonance phenomenon generated when the free vibration frequency and the external force frequency generated by reversible conversion between different energies are very close. As a circuit which arises, it is also called a tuning circuit.

In addition, the resonant circuit 300 is electrically resonated at a specific frequency determined by the values of the coils and capacitors in the electric circuit of the coils and capacitors, and the electrical properties of the coils and capacitors are apparently dissipated so that some quantum inherent It becomes a circuit of electric resistance delivery.

That is, the resonant circuit 300 refers to a circuit that is freely converted between the electrostatic energy of the capacitor (C) and the electromagnetic energy of the inductance (L), the capacitor (C) and the inductance (L) is a series resonant circuit in series and a parallel resonant circuit in parallel.

Accordingly, the resonant circuit 300 of the ELIDD current generation unit 220 adjusts the power supply voltage VDD input from the power supply unit 210 to generate an oscillation power that is greater than the power supply voltage VDD to generate the transformer 310. To pass). In addition, when the current source ELIDD transmitted to the panel unit 250 is applied in an overcurrent state, the resonant circuit 300 blocks the overcurrent ELIDD according to the resonance control signal transmitted from the current sensing unit 230.

Next, the transformer 310 provided in the ELIDD current generation unit 220 may also be generally referred to as a transformer.

Generally, the transformer includes a power transformer connected to a transmission and distribution line and a coupling transformer used in an electronic circuit. The power transformer can change the voltage applied to the AC circuit, so the power does not change. In addition, the power transformer has a primary winding connected to a power source and a secondary winding connected to a load are wound with the same iron core.

Accordingly, the transformer 310 converts the oscillation power received from the resonant circuit 300 into a current source ELIDD required by the organic light emitting diode of the panel unit 250, thereby converting the organic field of the panel unit 250. Transfer to the light emitting element.

Subsequently, the switching frequency unit 240 is disposed to connect the resonant circuit 300 and the transformer 310 of the ELIDD current generator 220. The switching frequency transmitted from the transformer 310 of the ELIDD current generation unit 220 and the natural vibration frequency present in the switching frequency unit 240 are compared. If the switching frequency and the natural vibration frequency coincide with each other, the switching frequency unit 240 may generate resonance, and the size of the oscillation power delivered from the resonance circuit 300 may be reduced.

Next, the current detector 230 of the organic light emitting device includes a photo coupler 320 and an overcurrent detector 330. That is, the current sensing unit 230 is connected between the ELIDD current generating unit 220 and the panel unit 250 to output the current source ELIDD output from the transformer 230 of the ELIDD current generating unit 220 in real time. Watch.

If the current source ELIDD is overloaded and applied to the panel 250, the organic light emitting diode of the panel 250 is damaged. Accordingly, the serviceter 340 provided in the panel unit 250 detects that the organic light emitting diode of the panel unit 250 is not damaged by heat generated by the overcurrent ELIDD. That is, the thermistor 340 generates an overcurrent ELIDD detection signal, which is a signal detected by the overcurrent ELIDD, and transmits the overcurrent ELIDD detection signal to the overcurrent detection unit 330. In addition, the current detector 230 generates the resonance control signal by receiving the overcurrent ELIDD detection signal output from the thermistor 340 of the panel unit 250. In addition, the resonance control signal is fed back to the resonance circuit 300 of the ELIDD current generator 220 to control the ELIDD current generator 220.

FIG. 5 is a circuit diagram illustrating circuit parts included in an organic light emitting device according to a second exemplary embodiment of the present invention.

Referring to FIG. 5, the switching frequency unit 240 may include a switching frequency transmitted from the primary winding of the transformer 330 of the ELIDD current generation unit 220, and a natural vibration frequency inside the switching frequency unit 240. If they match, resonance occurs, reducing the current magnitude of the overcurrent ELIDD.

In addition, the switching frequency unit 240 includes resistors R1 and R2 and capacitors C1 and C2. That is, the capacitor C1 of the switching frequency unit 240 is connected in parallel with the primary winding of the transformer 310 to act as a resonance capacitor so that the natural vibration frequency generated in the capacitor C1 is compared with the switching frequency. Accordingly, when the natural vibration frequency and the switching frequency coincide with each other, the overcurrent ELIDD decreases in current magnitude and passes through the capacitor C2 and the resistors R1 and R2, and the resonant circuit 300 of the ELIDD current generation unit 220. Is fed back to.

In general, the thermistor 340 provided in the panel unit 250 having the encapsulated glass or the sub-basket 345, which is a metal gate, is a semiconductor circuit device in which electrical resistance decreases as temperature increases. And semiconductors sintered by mixing two or three kinds of oxides of copper, manganese, iron, nickel, and titanium so as to have appropriate resistivity and temperature coefficient.

That is, unlike the current commercially available metals, the thermistor 340 has a characteristic that the resistance value decreases when the temperature increases, and the thermistor 340 has a direct heat type, a heat dissipation type, and a delay type. Are classified as).

In addition, since the thermistor 340 has a small heat capacity, a sudden resistance change occurs even with a slight temperature change. Accordingly, the thermistor 340 is widely used in applications such as temperature control sensors, thermometers, thermometers, hygrometers, barometers, anemometers, microwave power meters, communication devices that compensate for temperature changes, and automatic gain adjustment of communication lines.

Here, there is also a thermistor 340 in which the resistance value increases as the temperature increases in the thermistor 340. The thermistor 340 is made by mixing about 0.1% tin and cerium in a barium titanate-based semiconductor.

Therefore, when the overcurrent ELIDD is applied to the panel unit 250, the thermistor 340 provided in the sub-basket 345 may cause the organic field of the panel unit 250 to generate heat generated by the overcurrent ELIDD. Sensing the light emitting device is not damaged. That is, the thermistor 340 generates an overcurrent ELIDD detection signal, which is a signal detected by the overcurrent ELIDD, and transmits the overcurrent ELIDD detection signal to the overcurrent detection unit 330.

The overcurrent detector 330 includes resistors R3, R6, and R7, a capacitor C3, a zener diode ZD1, and an overcurrent control transistor Q1. The resistor R3 is disposed between the input terminal of the panel unit 250 and the drain terminal of the overcurrent control transistor Q1. In FIG. 5, the resistor R3 is connected in series, and the resistor R6 and the capacitor C3 are interposed in parallel between the resistor R3 and the base terminal. However, the number of resistors and capacitors may be changed according to the embodiment. May also be appropriately arranged. In addition, the resistance value of the series-connected resistor R3 may be appropriately changed according to the level of the overcurrent ELIDD sensing signal transmitted from the thermistor 340.

In addition, the base terminal and the emitter terminal of the overcurrent control transistor Q1 are disposed to be connected with a resistor R7 and a zener diode ZD1 to prevent breakage of the transistor Q1.

The overcurrent ELIDD sensing signal received from the thermistor 340 raises the voltage at the base terminal of the overcurrent control transistor Q1. That is, the transistor Q1 is turned on as the voltage of the base terminal of the transistor Q1 increases. In addition, the photo coupler 320 provided in the current sensing unit 230 recognizes the overcurrent ELIDD transmitted from the transformer 310 to the panel unit 250, and thus is an optical element that is a display element provided in the photo coupler 320. The diode is turned on and emits light.

However, when the rectifier ELIDD transmitted from the transformer 310 to the panel unit 250 is applied to the normal current source ELIDD, the photodiode of the photo coupler 320 is turned off and the photodiode is not emitted. .

In addition, as the overcurrent control transistor Q1 provided in the overcurrent sensing unit 330 is turned on by the overcurrent ELIDD transmitted from the ELIDD current generation unit 220, the light emitting diode is turned on. In addition, the bipolar junction transistor Q2 disposed in the photo coupler 320 is turned on by the turn-on of the light emitting diode to generate a resonance control signal. That is, the resonance control signal is input to control the resonance circuit operation of the ELIDD current generation unit 220. In addition, the resonance circuit 300 in which the resonance control signal is received may have a pulse width of the oscillation power so that the overcurrent ELIDD output from the ELIDD current generation unit 220 is not transmitted to the organic light emitting diode of the panel unit 250. Adjust or block in advance so that the oscillating power is not delivered to the transformer 310.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

According to the present invention described above, the organic light emitting device having an ELIDD current generating unit, a current sensing unit, a switching frequency unit and a panel unit on which the thermistor is mounted can prevent the overcurrent generated from the power supply unit from being input to the panel unit in advance. The organic electroluminescent device has an effect of not being damaged.

Claims (22)

A power supply unit for supplying a power supply voltage VDD required for operation of the panel unit; An ELIDD current generator disposed between the power supply unit and the panel unit to receive a power supply voltage VDD output from the power supply unit to generate a current source ELIDD supplied to the panel unit; A switching frequency unit connected to and disposed with the ELIDD current generation unit and controlling an operation of the ELIDD current generation unit; A panel unit for receiving a current source ELIDD output from the ELIDD current generation unit and displaying a predetermined screen using an organic light emitting element; And And a current sensing unit for sensing the current source ELIDD and controlling the operation of the ELIDD current generation unit. The organic light emitting device of claim 1, wherein when the current source ELIDD output from the ELIDD current generation unit is overloaded, the current sensing unit senses that the overloaded current source ELIDD is not supplied to the panel unit. The method of claim 1, wherein the switching frequency unit A resonance capacitor generating a natural vibration frequency compared with a switching frequency transmitted from a transformer of the ELIDD current generation unit; And An organic light emitting device comprising a capacitor and a resistor connected in parallel with the resonant capacitor. The method of claim 2, wherein the ELIDD current generating unit A resonant circuit generating an oscillating power source and blocking an overcurrent ELIDD according to a resonance control signal of the current sensing unit; And a transformer for receiving the oscillation power generated from the resonance circuit and converting the oscillating power into a current source ELIDD transmitted to the panel unit. The method of claim 2, wherein the current sensing unit An overcurrent detector for detecting whether the current source ELIDD transmitted from the transformer of the ELIDD current generator to the panel unit belongs to an overcurrent; And a photo coupler for receiving the output of the overcurrent detector and generating a resonance control signal for controlling the operation of the resonance circuit. The method of claim 5, wherein the overcurrent detecting unit Resistors and capacitors that are overcurrent ELIDD above a threshold voltage or threshold current and are connected in at least one series or parallel; And And a transistor in which the resistor and the capacitor are connected in series and in parallel. 7. The organic light emitting device of claim 6, wherein the transistor is a bipolar junction transistor or a field effect transistor. The method of claim 5, wherein the photo coupler is A photodiode operating according to an output of the overcurrent detector; And And a resonant circuit control transistor for controlling the resonant circuit in accordance with the operation of the photodiode. 9. The organic light emitting device of claim 8, wherein the resonant circuit control transistor is a bipolar junction transistor or a field effect transistor. The organic light emitting device of claim 8, wherein the photo coupler transmits a resonance control signal in a feedback form to a resonant circuit of the ELIDD current generator. A power supply unit for supplying a power supply voltage VDD required for operation of the panel unit; An ELIDD current generator disposed between the power supply unit and the panel unit to receive a power supply voltage VDD output from the power supply unit to generate a current source ELIDD supplied to the panel unit; A switching frequency unit connected to and disposed with the ELIDD current generation unit and controlling an operation of the ELIDD current generation unit; A panel unit including a thermistor for generating an overcurrent ELIDD detection signal so that the organic light emitting diode is not damaged due to an overload of the current source ELIDD output from the ELIDD current generation unit; And And a current sensing unit for sensing the current source ELIDD and receiving an overcurrent ELIDD sensing signal to control the operation of the ELIDD current generation unit. The method of claim 11, wherein the ELIDD current generating unit A resonant circuit generating an oscillating power source and blocking an overcurrent ELIDD according to a resonance control signal of the current sensing unit; And a transformer for receiving the oscillation power generated from the resonance circuit and converting the oscillating power into a current source ELIDD transmitted to the panel unit. 12. The organic light emitting device of claim 11, wherein when the current source ELIDD output from the ELIDD current generating unit is overloaded, an overcurrent ELIDD having an exothermic state is transferred to the thermistor. The organic light emitting device of claim 13, wherein the overcurrent ELIDD is transferred to a thermistor and converted into an overcurrent ELIDD sensing signal, and the overcurrent ELIDD sensing signal is transferred to a current sensing unit and converted into a resonance control signal. 15. The organic light emitting device of claim 14, wherein the resonance circuit of the ELIDD current generator that receives the resonance control signal blocks an overcurrent ELIDD so that a normal current source ELIDD is supplied to the panel unit. The method of claim 11, wherein the switching frequency unit A resonance capacitor generating a natural vibration frequency compared with a switching frequency transmitted from a transformer of the ELIDD current generation unit; And An organic light emitting device comprising a capacitor and a resistor connected in parallel with the resonant capacitor. The method of claim 11, wherein the current sensing unit An overcurrent detector for detecting whether the current source ELIDD transferred from the transformer of the ELIDD current generator to the panel unit belongs to the overcurrent ELIDD; And a photo coupler for receiving the output of the overcurrent detector and generating a resonance control signal for controlling the operation of the resonance circuit. The method of claim 17, wherein the overcurrent detecting unit Resistors and capacitors that are overcurrent ELIDD above a threshold voltage or threshold current and are connected in at least one series or parallel; And And a transistor in which the resistor and the capacitor are connected in series and in parallel. 19. The organic light emitting device of claim 18, wherein the transistor is a bipolar junction transistor or a field effect transistor. 18. The device of claim 17, wherein the photo coupler is A photodiode operating according to an output of the overcurrent detector; And And a resonant circuit control transistor for controlling the resonant circuit in accordance with the operation of the photodiode. 21. The organic light emitting device of claim 20, wherein the resonant circuit control transistor is a bipolar junction transistor or a field effect transistor. 21. The organic light emitting device of claim 20, wherein the photo coupler transmits a resonance control signal in a feedback form to a resonant circuit of the ELIDD current generator.

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