KR100864984B1 - Light Emitting Display - Google Patents

Abstract

According to an aspect of the present invention, there is provided a display device including: a panel including subpixels located in a matrix form on a display portion partitioned on a substrate and monitoring pixels located on the outside of the display portion; A driver supplying a driving signal through signal wires connected to the subpixels and the monitoring pixels included in the panel, respectively; And a power supply having a plurality of output channels to receive one power to supply one or more different powers to at least one of the sub-pixels, the monitoring pixels, or the driver. And a control unit which receives a detection signal according to a change in environmental conditions of the panel and adjusts an output of the power supply unit. The control unit includes a sample and hold circuit for receiving the sensing signal and an amplifier circuit for generating a reference voltage based on any one of the output power of the power supply unit by the sensing signal supplied to the sample and hold circuit. The reference voltage provides an electroluminescence display device for controlling the output of the power supply unit.

EL display, power supply, control unit

Description

Light Emitting Display

1 is a schematic circuit diagram of a conventional power supply device for an electroluminescent display.

2 is a diagram illustrating a subpixel circuit configuration of an electroluminescent display.

3 is a schematic plan view of an electroluminescent display device according to an embodiment of the present invention;

4 is a block diagram according to a schematic driving concept of an electroluminescent display.

5 is a schematic circuit diagram of a power supply unit and a control unit according to the first embodiment;

6 is a timing diagram for controlling a switch.

7 is a schematic circuit diagram of a control unit according to the second embodiment.

8 is a schematic circuit diagram of a power supply unit and a control unit according to the second embodiment;

9 is a schematic circuit diagram of a control unit.

10 illustrates an example monitoring pixel disposed within a panel.

<Explanation of symbols on main parts of the drawings>

110: panel 120: subpixels

125: monitoring pixels 130: display unit

140: signal wires 150: driver

155: pad portion 160: drive device

165: cable 170: power supply

180: control unit

The present invention relates to an electroluminescent display device.

Recently, much interest and research on flat panel displays (eg, liquid crystal displays, field emission displays, organic light emitting diodes, etc.) have been conducted.

The flat panel display devices can be driven by using a current supplying power supply, which is generally composed of a passive element such as an inductor and a DC-DC converter.

1 is a schematic circuit diagram of a conventional power supply device for an electroluminescent display.

The conventional electroluminescent display power supply apparatus shown in FIG. 1 includes an input terminal Vin that receives primary power from an external source, and an output terminal Vout that converts primary power and outputs the secondary power.

The input terminal Vin is provided with an inductor L1 for storing the input charge, and the output terminal Vout is provided with a diode D1 for sending the input charge to the output terminal Vour. The first and second capacitors C1 and C2 are provided at both ends of the power supply and the output terminal Vout to stabilize the power supply.

On the other hand, between the inductor (L1) and the diode (D1) is provided with a direct current DC converter (DC-DC) for adjusting the voltage output to the output terminal (Vout). The DC-DC converter includes a first resistor R1 and a second resistor R2 for generating a feedback voltage to adjust the voltage at the output terminal Vout. As illustrated in FIG. 1, the DC-DC converter DC-DC may include a switching element Q1.

The DC-DC converter of the power supply device outputs the voltage of the output terminal Vout to a fixed value by using the resistors R1 and R2 without any special control device. The fixed output voltage is supplied to a panel such as a flat panel display.

The conventional power supply apparatus described above has no problem in driving a passive matrix type electroluminescent display, a voltage driven type active matrix type electroluminescent display, a current drive type active matrix type electroluminescent display, and the like.

However, in the case of a digital driving type active matrix type electroluminescent display device, since the driving transistor formed in the pixel in the panel operates in a linear region rather than a saturation region, the voltage applied to the source (or drain) of the driving transistor and the organic light emitting diode There was a requirement that the voltage across the anode (Vds or Vsd) should be less than the data voltage (Vgs).

In addition, in the case of a digitally driven active matrix type electroluminescent display, the pixels (red, green, and blue) in the panel have to be supplied with different voltages for each channel. There was a need for a power supply capable of supplying power.

However, since most of the power supplied to the panel is supplied through the anode electrode of the organic light emitting diode, the luminance of the organic light emitting diode is closely related to the power supplied through the anode electrode. In spite of this, when driving the digital driving method, there was a difficulty in supplying a satisfactory power.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide an electroluminescent display device capable of improving the display quality by generating a power source suitable for the environmental conditions of the panel.

According to an aspect of the present invention, there is provided a display device including: a panel including a plurality of subpixels located in a matrix form in a display unit partitioned on a substrate and a plurality of monitoring pixels located outside the display unit; A driver supplying a driving signal through signal wires connected to the subpixels and the monitoring pixels included in the panel, respectively; And a power supply having a plurality of output channels to receive one power to supply one or more different powers to at least one of the sub-pixels, the monitoring pixels, or the driver. And a control unit which receives a detection signal according to a change in environmental conditions of the panel and adjusts an output of the power supply unit. The control unit includes a sample and hold circuit for receiving the sensing signal and an amplifier circuit for generating a reference voltage based on any one of the output power of the power supply unit by the sensing signal supplied to the sample and hold circuit. The reference voltage provides an electroluminescence display device for controlling the output of the power supply unit.

The sense signal is supplied from monitoring pixels or an external device, which can be supplied regularly or irregularly.

The subpixels and the monitoring pixels include organic light emitting diodes emitting red, green, and blue colors, respectively, and the power supply unit may supply power to the scan driver included in the subpixels and the monitoring pixels and the driving unit.

Power supplied to the scan driver may be higher than power supplied to the subpixels.

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The sample & hold circuit may hold the sense signal for a period of one cycle or more, which is the next sampling time.

The controller may further include a passive circuit or an active circuit at an output terminal of the amplifier circuit.

When a passive circuit is included in the output terminal of the amplifying circuit, a reference voltage reduced by 1 / n times is generated, and when the active circuit is included in the output terminal of the amplifying circuit, a current-amplified reference voltage can be generated without voltage gain. .

The power supply unit may include a plurality of output stages including an input terminal receiving primary power and a boost converter for converting the primary power into one or more other secondary powers and outputting the same.

The boost converter may receive a reference voltage from the controller and adjust the output.

The plurality of output stages may include one or more switches or one or more regulators each for setting the output stage of the secondary power source output through the boost converter.

The power supply unit controls the switches to distribute the secondary power to each output stage when one or more switches are included in a plurality of output stages, and outputs the secondary power to the regulator when one or more regulators are included in the plurality of output stages. You can print

When more than one regulator is included in multiple output stages, the boost converter outputs the highest power to a portion of the output stage, and the output power from the boost converter can be adjusted to one or more other power sources using the output stage to which the regulator is connected. have.

One inductor may be connected to the input terminal.

The amplifier circuit may have a voltage gain of 1.

N of 1 / n may be 5.

The amplifying circuit may have the highest voltage among the voltages output through the power supply.

The monitoring pixels may be arranged for each scan line of the display unit.

At least one of the monitoring pixels may be disposed for each scan line of the display unit, and at least one of the monitoring pixels may be disposed at a half section of the scan line of the display unit.

The power supply may further include a current source for supplying current to the monitoring pixels.

The current source may be located in the panel or in the power supply.

The subpixels may further include one or more capacitors and transistors.

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Hereinafter, an electroluminescent display device according to the present invention will be described with reference to the drawings.

<Electroluminescent display device>

2 is a diagram illustrating a subpixel circuit configuration of an electroluminescent display.

The subpixel circuit configuration of FIG. 2 is an example of a subpixel circuit configuration located in a display section partitioned on a panel of an electroluminescent display.

As shown in FIG. 2, the sub pixel circuit configuration of the display unit partitioned on the panel includes a switching transistor TFT1 having a gate connected to the scan line SCAN and a first electrode connected to the data line DATA in common, and a switching transistor. A gate is connected to the second electrode of TFT1 and the first electrode is connected to the first power line VDD, and the driving transistor TFT2 is connected between the gate of the driving transistor TFT2 and the first power line VDD. And a light emitting diode D connected between the capacitor C and the second electrode of the driving transistor TFT2 and the second power supply line GND.

Here, the light emitting diode (D) may be an organic light emitting diode (D) in which the light emitting layer is formed of an organic material layer, but may also be an inorganic light emitting diode in which the light emitting layer is formed of an inorganic material layer.

In addition to the description of the structure of the organic light emitting diode (D), the organic light emitting diode (D) is common, such as a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL) and an electron injection layer (EIL) The organic light emitting layer (EML) is interposed between the film.

In general, the common film is selectively formed between the first electrode (pixel electrode) and the cathode of the driving transistor TFT2 serving as the anode electrode.

One sub-pixel (Sub-Pixel) having such a circuit configuration includes one organic light emitting diode (D). Each sub pixel emits red (R), green (G), and blue (B), and the sub pixels emitting red, green, and blue may be defined as one pixel.

Meanwhile, the transistor included in the subpixel may be driven in a linear region or a saturation region by a driving signal supplied from the driver. However, the electroluminescent display device according to the present invention uses a transistor included in the subpixel. It is advantageous to adopt a digital driving method for driving in the linear region. Here, the digital driving method refers to a method of driving the light emitting diode D by simply turning on or off a transistor.

Although not shown, in the display unit partitioned on the panel according to the exemplary embodiment of the present invention, monitoring pixels for effectively supplying power or a signal required for driving may be located with reference to the temperature or temporal change of the sub pixels described above.

Such monitoring pixels are disposed outside the display unit, and their circuit configuration may be generally similar or identical to those of the subpixels.

Meanwhile, the circuit configuration or connection relationship between the subpixels and the monitoring pixels may vary depending on the number of transistors constituting each pixel or the structure of the transistor.

3 is a schematic plan view of an electroluminescent display device according to an embodiment of the present invention.

In the electroluminescent display shown in FIG. 3, the plurality of subpixels 120 located in a matrix form on the display unit 130 partitioned on the substrate and the monitoring pixels 125 located outside the display unit 130 are provided. It includes a panel 110 including a.

And a driver 150 for supplying a driving signal through the signal wires 140 connected to the sub pixels 120 and the monitoring pixels 125 included in the panel 110, respectively.

And a power supply unit 170 having a plurality of output channels to supply one or more different power to any one or more of the sub-pixels 120, the monitoring pixels 125, or the driver 150 by receiving one power. do.

And a controller 180 that receives a detection signal according to a change in environmental conditions of the panel 110 to adjust an output of the power supply unit 170. The controller 180 may be located in the panel 110 or the power supply unit 170.

Here, the subpixels 120 and the monitoring pixels 125 include organic light emitting diodes emitting red, green, and blue colors, respectively.

That is, the subpixels 120 are divided into red subpixels 120R, green subpixels 120G, and blue subpixels 120B to emit red, green, and blue light, respectively, and to monitor pixels 125. ) May be divided into red monitoring pixels 125R, green monitoring pixels 125G, and blue monitoring pixels 125b to emit red, green, and blue light, respectively. However, the subpixels 120 and the monitoring pixels 125 may emit other colors.

The power supply unit 170 may supply power to the sub-pixels 120, the monitoring pixels 125, and the scan driver (not shown) and the data driver (not shown) included in the driver 150. However, the power supplied to the scan driver may be higher than the power supplied to the subpixels 120.

Meanwhile, although the driving unit 150 has been described as being positioned in the panel 110 of the electroluminescent display device according to the exemplary embodiment of the present invention, the driving unit 150 may be located outside the panel 110. The driver 150 shown in the drawing includes a scan driver and a data driver.

In general, the panel 110, the driver 150, and the driver 160 may be electrically connected to each other by a flexible cable (eg, FPC) 165, and the like. The flexible cable 165 may be connected to the panel 110. It is attached to the pad unit 155 located to supply the driving signal and power to the panel 110. In addition, the driving unit 150 may be located on the cable 165.

The driving device 160 described above may include the power supply unit 170 and the controller 180, and may further include other image memory, a processor, and the like.

Meanwhile, the electroluminescent display device according to the present invention may receive a detection signal from the monitoring pixels 125 or an external device (not shown) so as to generate and supply power corresponding to environmental conditions of the panel 110. Can be supplied regularly or irregularly.

Here, the external device may refer to a manual input by a user such as a remote controller or an automatic input by a set value such as processing of a driving device.

However, according to the present invention, the sensing signal according to the environmental condition of the panel 110 is supplied from the monitoring pixels 125 as an example.

Hereinafter, a schematic driving concept of an electroluminescent display device according to an exemplary embodiment of the present invention will be described with reference to FIG. 4.

4 is a block diagram illustrating a schematic driving concept of an electroluminescent display.

Referring to FIGS. 3 and 4, when the monitoring pixels 125 disposed on the panel 110 supply a sensing signal to the controller 180, the electroluminescent display device according to an embodiment of the present invention may include a controller ( 180 controls the output power of the power supply unit 170 with reference to the detection signal.

First Embodiment

Hereinafter, a detailed circuit configuration of the power supply unit and the control unit according to the first embodiment will be described in more detail with reference to FIG. 5.

5 is a schematic circuit diagram of a power supply unit and a control unit according to the first embodiment.

The controller 180 is based on any one of a sample & hold circuit that receives the sensing signal Vref from the monitoring pixels 125 and an output power of the power supply unit 170 by the sensing signal supplied to the sample & hold circuit. Amplification circuit for generating a reference voltage Vref. Here, the output of the power supply unit 170 may be controlled by the generated reference voltage Vref.

The power supply unit 170 includes one input terminal Vin supplied with primary power, and a boost converter SWx (shown briefly as a switch) for converting the primary power into one or more other secondary powers and outputting the same. It may include a plurality of output terminals (V1, V2, V3, Vn).

Here, the primary power supplied to the input terminal (Vin) is charged in the inductor (L) and then converted and output through the boost converter (SWx), etc. In general, the input terminal (Vin) and output terminals (V1, V2, V3, Vn) Although not shown), it may further include a capacitor.

The boost converter SWx may receive the reference voltage Vref from the controller 180 and adjust the output of the output terminals V1, V2, V3, and Vn of the power supply unit 170. Here, the power supply of the output terminals V1, V2, V3, Vn is V1> V2> V3> Vn, V1 = V2 = V3 = Vn, V1> V2 = V3 = Vn or V1> V2, V1> V3, V1> Vn And so on.

When one or more switches SW1, SW2, SW3, and SWn are included in the plurality of output terminals V1, V2, V3, and Vn of the power supply unit 170, the power supply unit 170 as in the first embodiment of the present invention. The controller controls the switches SW1, SW2, SW3, and SWn with reference to the reference voltage Vref supplied from the controller 180, and distributes the converted secondary power to each output terminal V1, V2, V3, and Vn. do.

6 is a timing diagram for controlling a switch.

5 and 6, the switches SW1, SW2, SW3, and SWn of the power supply unit 170 as described above may be controlled by timings such as (a) or (b).

That is, the switches SW1, SW2, SW3, and SWn of the power supply unit 170 may be selectively switched according to the requirements of the respective output terminals V1, V2, V3, and Vn.

7 is a schematic circuit diagram of a control unit according to the first embodiment.

As illustrated in FIG. 7, the controller 180 includes a sample & hold circuit C (simplified display of one capacitor) and a sample & hold circuit C, which receive a sensing signal VM from the monitoring pixels 125. It includes an amplifier circuit (OP) for generating a reference voltage (Vref) based on any one of the output power of the power supply unit 170 by the sensing signal (VM) supplied to the.

The sample & hold circuit C included in the controller 180 can hold the detection signal VM for at least one period, which is the next sampling time. Of course, sample & hold time and capacitance can vary depending on circuit configuration and requirements.

The amplifying circuit OP provided in the controller 180 may have the highest voltage among the voltages output through the power supply unit 170 as a power source. V1 in the figure refers to the power supply terminal of the amplifier circuit OP. In addition, the switch SWx is for controlling whether the sensing signal VM is supplied, which may be linked to the controller 180 or another external device.

Meanwhile, the controller 180 may include a plurality of passive circuits R1 .. Rn and Rt at the output terminal of the amplifier circuit OP. Accordingly, the output terminal of the amplifying circuit OP may generate the reference voltage Vref reduced by 1 / n times, where n is 5, that is, the reference voltage Vref may be formed to be reduced by 1/5. have.

However, this is only in accordance with an embodiment of the present invention, the passive circuit (R1..Rn, Rt) does not necessarily have to be provided, it is a matter of course that the value of n described above may require a value other than 5. The reason for outputting in the form of 1 / n times reduced as described above illustrates that the reference voltage Vref can be selectively applied.

On the other hand, the power supply unit 170, as described above, in order to drive the current when the panel 110 is small, the power frequency bandwidth may be set in the range of 600Khz to 1.2Mhz, but if the panel 110 is large It may be set to have a frequency bandwidth in a lower range than the range.

In addition, the power supply unit 170 may vary the output values output through the plurality of output terminals depending on whether the organic light emitting diode formed in the sub-pixel 120 of the panel 110 is a phosphor or a fluorescent material. In other words, a driving current suitable for the light emitting material may be supplied.

Second Embodiment

In the electroluminescent display device according to the second embodiment of the present invention, when the monitoring pixels arranged in the panel supply a sensing signal to the controller, the controller adjusts power of an output terminal of the power supply unit with reference to the sensing signal. However, the second embodiment of the present invention is similar to the first embodiment described above, but since the configuration of the power supply unit and the control unit is different, a description thereof will be provided.

8 is a schematic circuit diagram of a power supply unit and a control unit according to the second embodiment.

Referring to FIGS. 3 and 8, the controller 180 may include a sample and hold circuit that receives a sensing signal Vref from the monitoring pixels 125, and a power supply unit by a sensing signal supplied to the sample and hold circuit. An amplifier circuit for generating a reference voltage (Vref) based on any one of the output power of the 170. Here, the output of the power supply unit 170 may be controlled by the generated reference voltage Vref.

The power supply unit 170 includes one input terminal Vin supplied with primary power, and a boost converter SWx (shown briefly as a switch) for converting the primary power into one or more other secondary powers and outputting the same. It may include a plurality of output terminals (V1, V2, V3, Vn).

Here, the primary power supplied to the input terminal (Vin) is charged in the inductor (L) and then converted and output through the boost converter (SWx), etc. In general, the input terminal (Vin) and output terminals (V1, V2, V3, Vn) Although not shown), it may further include a capacitor.

The boost converter SWx may receive the reference voltage Vref from the controller 180 and adjust the output of the output terminals V1, V2, V3, and Vn of the power supply unit 170.

As in the second embodiment of the present invention, when one or more regulators LDO1, LDO2, and LDOn are included in the plurality of output terminals V1, V2, V3, and Vn of the power supply unit 170, the power supply unit 170 may include a controller. The converted secondary power source is output to each output terminal V1, V2, V3, and Vn with reference to the reference voltage Vref supplied from 180.

When one or more regulators LDO1, LDO2, and LDOn are included in the output terminals V1, V2, V3, and Vn, the boost converter SWx may output the highest power. In this case, the terminal at which the highest power is output is V1. Here, the power supply of the plurality of output terminals V1, V2, V3, Vn is V1> V2> V3> Vn, V1> V2, V1> V3, V1> Vn or V1> V2 = V3 = Vn or the like. LDO2, LDOn).

Each regulator LDO1, LDO2, and LDOn may have different output values so that the power supplied from the boost converter SWx can be adjusted to one or more other power supplies. Here, it may be effective to use a low drop out (LDO) type to increase the output of the regulators LDO1, LDO2, and LDOn.

9 is a schematic circuit diagram of a control unit according to a second embodiment.

Referring to FIGS. 3 and 9, the controller 180 may include a sample & hold circuit C (abbreviated as one capacitor) that receives a sensing signal VM from the monitoring pixels 125, and a sample & hold circuit ( And an amplifying circuit OP generating the reference voltage Vref based on any one of the output power of the power supply unit 170 by the sensing signal VM supplied to C).

The sample & hold circuit C included in the controller 180 can hold the detection signal VM for at least one period, which is the next sampling time. Of course, sample & hold time and capacitance can vary depending on circuit configuration and requirements.

The amplifying circuit OP provided in the controller 180 may have the highest voltage among the voltages output through the power supply unit 170 as a power source. V1 in the figure refers to the power supply terminal of the amplifier circuit OP. In addition, the switch SWx is for controlling whether the sensing signal VM is supplied, which may be linked to the controller 180 or another external device.

The controller 180 may include an active circuit TFT at an output terminal of the amplifier circuit OP. When the active circuit TFT is included in the output terminal of the amplifying circuit OP, only the current amplified without reference to voltage gain may generate a reference voltage Vref.

The reason for amplifying the current only without voltage gain is that the organic light emitting diode formed in the subpixel 120 disposed in the panel 110 drives the current.

On the other hand, the power supply unit 170, as described above, in order to drive the current when the panel 110 is small, the power frequency bandwidth may be set in the range of 600Khz to 1.2Mhz, but if the panel 110 is large It may be set to have a frequency bandwidth in a lower range than the range.

In addition, the power supply unit 170 may vary the output values output through the plurality of output terminals depending on whether the material of the organic light emitting diode formed in the sub pixel 120 of the panel 110 is phosphorescent or fluorescent. In other words, a driving current suitable for the light emitting material may be supplied.

10 is an exemplary diagram of monitoring pixels disposed in a panel.

3 and 10, the monitoring pixels 125 according to the first and second embodiments of the present invention are disposed outside the display unit 130 in the panel 110, and the scan line S1 of the display unit 130 is provided. Can be arranged per .Sn).

In addition, one or more of the monitoring pixels 125 are disposed for each scan line S1..Sn of the display unit 130, and the other one or more sections are provided in a half section of the scan line S1..Sn of the display unit 130. Only can be placed. This may be a way to reduce power consumption by applying a monitoring pixel on the panel 110.

In this case, the monitoring pixels 125 disposed only in a half section on the scan lines S1 and Sn of the display unit 130 may be blue monitoring pixels 125B, but this may vary depending on the emission luminance.

Meanwhile, the power supply unit 170 may further include a current source (not shown) for supplying current to the monitoring pixels 125, which may be selectively positioned on the power supply unit 170 and the panel 110. .

The first and second embodiments of the present invention detect a change in environmental condition of the panel by using monitoring pixels disposed on the panel, generate the detected signal, and supply the detected signal to the controller. The controller refers to the detected signal. After generating the voltage, the power of the output terminal of the power supply is adjusted. Here, the power supply unit may supply a single input to a plurality of outputs, that is, a single input multiple output (SIMO) to supply power required for the red, green, and blue subpixels.

As described above, the driving system is repeatedly displayed in a specific cycle according to the change in the environmental condition of the panel. According to this change, the power supply unit can continuously supply the panel with regular or irregularly regulated power.

This is particularly applicable to an electroluminescent display device in which a digital driving method (a transistor formed in a sub-pixel operates in a linear region) is because the voltage and luminance supplied from the power supply unit to the panel are in close proximity to each other. Because there is a relationship. Digital driving is a method in which a transistor formed in a subpixel operates in a linear region.

Meanwhile, instead of receiving the reference voltage from the monitoring pixels, the power supply unit has a control unit for controlling the boost converter therein and receives primary power from the outside through an input terminal provided as one inductor. If one or more switches or one or more regulators are respectively provided at a plurality of output stages to output a plurality of differential power sources, a design of a power supply device capable of supplying various types of powers required by the electroluminescent display is possible.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical configuration of the present invention described above may be modified in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

As described above, the present invention has the effect of improving the display quality of the electroluminescent display by generating a power source suitable for the environmental conditions of the panel. In addition, there is an effect that can generate and supply the power required for each sub-pixel of the panel individually.

Claims (27)

A panel including a plurality of subpixels positioned in a matrix form in a display unit partitioned on a substrate and a plurality of monitoring pixels located outside the display unit; A driver supplying a driving signal through signal lines connected to the sub pixels and the monitoring pixels included in the panel, respectively; A power supply having a plurality of output channels to receive one power to supply one or more different powers to any one or more of the sub-pixels, the monitoring pixels, or the driver; And A control unit which receives a detection signal according to a change in environmental conditions of the panel and adjusts an output of the power supply unit; The control unit includes a sample and hold circuit for receiving the sensing signal and an amplifier circuit for generating a reference voltage based on any one of the output power of the power supply unit by the sensing signal supplied to the sample and hold circuit. And the reference voltage controls the output of the power supply unit. The method of claim 1, wherein the detection signal, An electroluminescence display device supplied from the monitoring pixels or an external device, which is regularly or irregularly supplied. The method of claim 1, wherein the subpixels and the monitoring pixels are: An organic light emitting diode emitting red, green, and blue light, respectively, And the power supply unit supplies power to the scan driver included in the subpixels and the monitoring pixels and the driver. delete delete The method of claim 1, wherein the sample and hold circuit, And an electroluminescent display for holding the detection signal for a period of one cycle or more, the next sampling time. The method of claim 1, wherein the control unit, And a passive circuit or an active circuit at the output terminal of the amplifying circuit. The method of claim 7, wherein When the passive circuit is included in the output terminal of the amplifying circuit, a reference voltage reduced by 1 / n times is generated, And an active circuit included in the output terminal of the amplifying circuit to generate a reference voltage amplified only of current without voltage gain. The method of claim 1, wherein the power supply unit, And a plurality of output stages including an input terminal receiving primary power and a boost converter for converting the primary power into one or more other secondary powers and outputting the same. The method of claim 9, wherein the boost converter, And an output voltage supplied from the controller to adjust an output. The method of claim 9, The plurality of output stages, To set the output stage of the secondary power output through the boost converter An electroluminescent display device comprising at least one switch or at least one regulator each. The method of claim 11, wherein the power supply unit, When the one or more switches are included in the plurality of output stages, By controlling the switch to distribute the secondary power to each output stage, When the one or more regulators are included in the plurality of output stages, And an output of the secondary power supply to the regulator. The method of claim 12, When the one or more regulators are included in the plurality of output stages, And the boost converter outputs the highest power to a part of the output terminal, and adjusts and outputs the power supplied from the boost converter to one or more other power using an output terminal to which the regulator is connected. The method of claim 9, And an inductor connected to the input terminal. The method of claim 1, And wherein said amplifying circuit has a voltage amplification gain of one. The method of claim 8, 1 / n, wherein n is 5. The method of claim 15, And the amplifying circuit has a highest voltage among the voltages outputted through the power supply unit as a power source. The method of claim 3, wherein the monitoring pixels, And an electroluminescence display device arranged for each scan line of the display portion. The method of claim 3, At least one of the monitoring pixels is disposed for each scan line of the display unit, and at least one of the monitoring pixels is disposed at only a half section of the scan line of the display unit. The method of claim 3, wherein the power supply unit, And a current source for supplying current to the monitoring pixels. The method of claim 20, wherein the current source, An electroluminescent display device located in the panel or the power supply. The method of claim 3, wherein the sub-pixels, An electroluminescent display further comprising at least one capacitor and a transistor. delete delete delete delete delete

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