KR200433017Y1 - Dc driver for driving light emitting polymer - Google Patents

Abstract

A dish driver for controlling a polymer organic light emitting display that drives the polymer organic light emitting display with a direct current (DC) power source is disclosed. The dish driver is a dish driver for driving a light emitting polymer (LEP), the driver having a direct current power supply ranging from a voltage of 50 volts (V) to a voltage of 180 volts (V). And a driving power source having a voltage within and a frequency in the range of 40 Hz to 850 KHz to the polymer organic light emitting display.

LP, LEP, Polymer Organic Light Emitting Display, Driver

Description

Dish driver for driving polymer organic light emitting display {DC DRIVER FOR DRIVING LIGHT EMITTING POLYMER}

1 is a view showing the structure of a polymer organic light emitting display (LEP) driven by the present invention.

2 is a circuit diagram illustrating a dish driver for driving a polymer organic light emitting display according to an exemplary embodiment of the present invention.

The present invention relates to a driver for a light emitting polymer (LEP) light emitting diode (LEP), and in particular, a dish driver for controlling a polymer organic light emitting display for driving a polymer organic light emitting display with a direct current (DC) power source. It is about.

In general, the billboard is to provide the information the advertiser wants to catch the attention of the consumer. Therefore, it attracts the attention of consumers by expressing unique characters, figures and colors. Conventionally, the letters or figures desired to be written or engraved on acrylic plates or synthetic resin sheets are often used. However, since the visibility is greatly reduced at night, recently, neon lamps, fluorescent lamps, CCFLs (Cold Cathode Fluorescent Lamps), etc. It's common to use backlights to see your ad at night.

On the other hand, in recent years, a self-luminous electroluminescent sheet (EL) has been developed. The electroluminescent device forms a light emitting layer by sequentially forming a fluorescent layer and an insulating layer between the transparent conductive film and the back electrode to form a light emitting layer and to protect the light emitting sheet. In order to protect the surface layer between the insulating layer and the back electrode, a surface light emitting body is formed. When an AC voltage is applied to the light emitting layer, the light generated in the fluorescent layer is emitted through the transparent conductive film. The electroluminescent sheet is an ultra-thin plane of 2 mm or less and has an operating frequency of 400 Hz to 2,000 Hz at an operating temperature of -35 to 70 ° C.

The electroluminescent device described above is classified into ELD and LEP, and ELD is a polymer transparent film, which is a kind of polymer film having excellent flexibility, transmission characteristics and heat resistance, and is coated on the back of the polyester transparent film, and has conductive properties and A front electrode layer formed of indium oxide (ITO) having excellent permeability, a fluorescent layer formed on the back of the front electrode layer, an organic dielectric layer formed on the back of the fluorescent layer, a back electrode layer formed on the back of the organic dielectric layer, and formed on the back electrode layer It consists of a protective layer.

The ELD is operated to emit light of a phosphor of a specific pixel by applying a predetermined external voltage to the front electrode layer and the back electrode layer. To explain this in more detail, the polyester transparent film is extruded to suit the purpose to 50 ~ 150um thickness to discharge the one side. And, in order to attenuate the problem of shrinkage due to thermal stress during the heat treatment process according to the manufacture of the inorganic electroluminescent device is formed by performing a heat treatment for about 30 minutes at about 150 ℃.

The front electrode layer is formed by sputtering indium oxide-tin to a thickness of several hundred to several thousand angstroms in consideration of light transmittance on the discharge-treated surface. At this time, the sheet resistance value of the indium tin oxide is preferably set to about several tens to several hundred ohm / squ. The organic dielectric layer is formed by dissolving a polyester resin-based polymer resin in a solvent, preparing a paste using a plasticizer, printing a thickness of about 30 to 70 um, and drying at about 100 to 140 ° C. for about 30 minutes. At this time, the transmittance of the organic dielectric layer is preferably set to about 70 to 80%.

On the other hand, LEP (Light Emitting Polymer) is composed of a fluorescent layer, a dielectric layer, a back electrode layer and a special synthetic resin layer, as shown in FIG. The fluorescent layer is a fluorine-based binder, has a dielectric constant of 30 GPa or more, and is excellent in durability and moisture resistance, and has high adhesiveness with a fabric and high luminance. The fabric described above is composed of a conductive polymer layer and a conductive mesh layer, and the surface resistance is designed to be very low, around 10 Ω㎡. In addition, high UV blocking and light diffusing power has been applied to a multi-purpose. In addition, the dielectric layer has excellent light diffusion and reflection, and the dielectric constant is designed to be 30 GPa or more. The back electrode is treated with AI and Cu films, has a large area, and has a resistance of about 10 Ωm 2, and the protective layer is capable of protecting the entire device by UV and IR, and is made of a flexible film with low moisture resistance.

However, the above-described LEP or ELD cannot directly connect and use AC power supplied to a general home or business site, and also have a problem in that the LEP or ELD cannot be directly connected and driven due to its light emission characteristics.

Accordingly, the present invention was conceived in view of the above-described circumstances, and an object of the present invention is to provide a DC driver for driving a polymer organic light emitting display that can drive a light emitting polymer (LEP) using a DC power supply. In providing.

A dish driver for driving a polymer organic light emitting display according to the present invention for achieving the above object is a dish (DC) driver for driving a light emitting polymer (LEP), the driver is The DC power supply is characterized by supplying a driving power having a voltage in the range of 50 volts (V) to a voltage of 180 volts (V) and a frequency in the range of 40 Hz to 850 KHz to the polymer organic light emitting display.

Preferably, the frequency of the drive power source is a frequency in the range of 50 Hz to 85 Hz, and the direct current power source is a voltage in the range from 3 DC direct current (V) to 30 DC direct current (V).

More preferably, the DC power supply is DC 12 volts (V) or DC 24 volts (V).

Also preferably, the driver further comprises a temperature sensor which is electrically connected to the high rich organic light emitting display, wherein the temperature sensor is the sensor of the drive power when a predetermined reference temperature or more is detected; The supply to the organic light emitting display is blocked. Preferably, the predetermined reference temperature is a temperature in the range of 50 ° C to 70 ° C.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

2 is a circuit diagram illustrating a dish driver for driving a polymer organic light emitting display according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the dish driver for driving the polymer organic light emitting display 500 according to the embodiment of the present invention uses the DC power supply 500 in a voltage range of 50 volts (V) to 180 volts (V). And a driving power source having a frequency within the range of 40 Hz to 850 KHz to the polymer organic light emitting display 400 to drive the polymer organic light emitting display 400.

The frequency of the driving power supplied to the polymer organic light emitting display 400 is preferably a frequency within a range of 50 Hz to 85 Hz. In addition, the DC power supply 500 preferably uses a voltage in the range of DC 3 volts (V) to DC 30 volts (V), more preferably 12 (24 VDC) or 24 volts.

Also preferably, the driver further includes a temperature sensor 600 electrically connected to the rich organic light emitting display 400. When the temperature sensor 600 detects a predetermined reference temperature or more, the temperature sensor 600 blocks the supply of the driving power to the organic light emitting display 500. Preferably, the predetermined reference temperature is a temperature in the range of 50 ° C. to 70 ° C., more preferably 6550 ° C.

According to a preferred embodiment, the driver includes an oscillator (100, 200) and the transformer (300). The oscillators 100 and 200 generate a transformer driving signal when the DC power supply 500 is applied, and supply the generated transformer driving signal to the transformer 500. Then, the transformer 300 generates the driving power according to the transformer driving signals from the oscillation parts 100 and 200.

According to a preferred embodiment, the oscillator includes a first switch circuit 100 and a second switch circuit 200. The first switch circuit 100 is turned off when the second switch circuit 200 is turned on, and turned on when the second switch circuit 200 is turned off. Here, the first switch circuit 100 has a predetermined first turn on time and a predetermined first turn off time, and the second switch circuit 200 has a predetermined second turn on time and a predetermined second turn off. Take time.

Preferably, the first switch circuit 100 includes a first transistor Q1, a first capacitor C3, and a first resistor R3. The collector of the first transistor Q1 is electrically connected to the DC power supply 500 through a second resistor R1, and the base of the first transistor Q1 is the DC power supply 500 and the first. It is electrically connected to one electrode of the capacitor C3. The other electrode of the first capacitor C3 is electrically connected to the transformer 300 through the first resistor R3, and the emitter of the first transistor Q1 is an input terminal of the transformer 300. Is electrically connected to the

In addition, similar to the first switch circuit 100, the second switch circuit 200 includes a second transistor Q3, a second capacitor C1, and a third resistor R2. The collector of the second transistor Q3 is electrically connected to the DC power supply 500 through a second resistor R1, and the base of the second transistor Q3 is one of the second capacitors C1. Is electrically connected to the electrode. The other electrode of the second capacitor C1 is electrically connected to the output terminal of the transformer 300 through the third resistor R2, and the emitter of the second transistor Q3 is the transformer 300. It is electrically connected to the input terminal of.

Preferably, the oscillator 100, 200 further includes noise removing circuits C4 and C2 for removing noise included in the outputs of the first and second switch circuits 100 and 200. According to an embodiment, the noise canceling circuit may include third and fourth capacitors C4 and C2 electrically connected between output terminals of the first and second switch circuits 100 and 200.

In more detail, the operation of the driver having the above configuration will be described in detail. The DC power supply 500 introduced through the fuse F1 is supplied to the base of the first transistor Q1 so that the first transistor Q1 is turned on. At this time, the first and second capacitors C3 and C1 are in a charged state. When the first transistor Q1 is turned on, the second transistor Q3 is turned off. Subsequently, the charging voltage of the first capacitor C3 is discharged so that the first transistor Q1 is turned off. The turn-off state of the first transistor Q1 is maintained for a time when the first capacitor C3 is charged again. When the first transistor Q1 is turned off, power is not supplied to the collector side of the first transistor Q1 and power is supplied to the collector of the second transistor Q3, and the second transistor Q3 The charging voltage of the second capacitor C1 is supplied to the base to turn on the second transistor Q3. After a predetermined time after the second transistor Q3 is turned on (time according to the time constant of the first capacitor C3 and the first resistor R3), the first capacitor C3 is charged again, As a result, the first transistor Q1 is turned on again. As the first transistor Q1 is turned on again, power flowing through the second resistor R1 flows into the collector side of the first transistor Q1 to turn off the second transistor Q3 again. . As described above, the first and second transistors Q1 and Q3 perform a continuous on / off operation. That is, the circuit oscillates the primary coil of the transformer 300 by oscillation by transistors, resistors, and capacitors. Due to the oscillation of the primary coil of the transformer 300, the secondary side oscillates with a boosted or reduced voltage. The noise generated by the oscillation is removed by the third and fourth capacitors C2 and C4.

As described above, according to the present invention, it is possible to implement a DC driver for driving a polymer organic light emitting display capable of driving a light emitting polymer (LEP) using a DC power supply.

Although the present invention has been illustrated and described with respect to specific preferred embodiments, the present invention is not limited to the above-described embodiments, and the present invention does not depart from the gist of the present invention claimed in the utility model registration claims. Any person with ordinary knowledge will be able to make various modifications.

Claims (12)

In a DC driver for driving a polymer organic light emitting display (LEP: Light Emitting Polymer), The driver may supply a direct current power supply to the polymer organic light emitting display, wherein the driving power having a voltage within a range of 50 volts (V) to a voltage of 180 volts (V) and a frequency within a range of 40 Hz to 850 KHz is supplied to the polymer organic light emitting display. Dish driver for driving luminous displays. The dish driver of claim 1, wherein the frequency of the driving power source is a frequency within a range of 50 Hz to 85 Hz. 2. The dish driver of claim 1, wherein the DC power source is a voltage within a range of DC 3 volts (V) to DC 30 volts (V). The dish driver of claim 1, wherein the direct current power source is a direct current 12 volt (V) or a direct current 24 volt (V). The method of claim 1, wherein the driver further comprises a temperature sensing sensor electrically connected to the rich organic light emitting display. The temperature sensor is a dish driver for driving a polymer organic light emitting display, characterized in that the supply of the driving power to the organic light emitting display, when a predetermined reference temperature or more is detected. The dish driver of claim 5, wherein the predetermined reference temperature is a temperature in a range of 50 ° C. to 70 ° C. 7. The driver according to any one of claims 1 to 4, wherein An oscillator for generating a transformer driving signal when the DC power is applied and supplying the generated transformer driving signal to a transformer; And And a transformer for generating the driving power according to the transformer driving signal from the oscillator. The apparatus of claim 7, wherein the oscillator comprises a first switch circuit and a second switch circuit. The first switch circuit is turned off when the second switch circuit is turned on, and is turned on when the second switch circuit is turned off, Wherein said first switch circuit has a predetermined first turn on time and a predetermined first turn off time, and said second switch circuit has a predetermined second turn on time and a predetermined second turn off time. A dish driver for driving an organic light emitting display. 9. The apparatus of claim 8, wherein the first switch circuit comprises a first transistor, a first capacitor, and a first resistor, the collector of the first transistor being electrically connected to the DC power source through a second resistor, A base of the first transistor is electrically connected to the DC power source and one electrode of the first capacitor, and the other electrode of the first capacitor is electrically connected to the transformer through the first resistor. The emitter is a dish driver for driving a polymer organic light emitting display, characterized in that electrically connected to the input terminal of the transformer. The method of claim 8, wherein the second switch circuit includes a second transistor, a second capacitor, and a third resistor, wherein the collector of the second transistor is electrically connected to the DC power supply through a second resistor. The base of the second transistor is electrically connected to one electrode of the second capacitor, the other electrode of the second capacitor is electrically connected to the output terminal of the transformer through the third resistor, The driver is a dish driver for driving a polymer organic light emitting display, characterized in that electrically connected to the input terminal of the transformer. The dish driver of claim 8, wherein the oscillator further comprises a noise removing circuit for removing noise included in outputs of the first and second switch circuits. 12. The dish for driving a polymer organic light emitting display as claimed in claim 11, wherein the noise canceling circuit comprises third and fourth capacitors electrically connected between output terminals of the first and second switch circuits. driver.

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