KR100603413B1 - Organic light emitting display device and information terminal - Google Patents

Abstract

The present invention discloses an organic light emitting display device and an information device capable of operating the first light emitting unit and the second light emitting unit simultaneously or selectively in a low power mode. The organic light emitting display device may include a substrate, a sealing member sealing one surface of the substrate, a first light emitting portion positioned between the substrate and the sealing member, a second light emitting portion positioned between the substrate and the sealing member, and the first light emitting member. A power supply voltage generator configured to supply power supply voltages to the first light emitting unit and the second light emitting unit, respectively, wherein the power supply voltage generator is configured to operate at least one of the first light emitting unit and the second light emitting unit in a low power mode. In response to a PDM signal, at least one of power voltages supplied to the first light emitting unit and the second light emitting unit is varied.

First light emitter, second light emitter, cathode voltage, normal operation mode, low power mode

Description

Organic Light Emitting Display Device and Information Terminal

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is an organic light emitting display device according to an embodiment of the present invention.

2 is a cross-sectional view illustrating an exemplary embodiment of the organic light emitting display device of FIG. 1.

3 is a cross-sectional view illustrating another exemplary embodiment of the organic light emitting display device of FIG. 2.

4 is a circuit diagram of one pixel of the organic light emitting display device of FIG. 1.

5 is a plan view illustrating pixels of the organic light emitting display device of FIG. 1.

FIG. 6 is a cross-sectional view of a pixel of the organic light emitting display device of FIG.

FIG. 7 is a diagram illustrating an embodiment of a PDM generator of FIG. 1.

FIG. 8 is a diagram illustrating another embodiment of the PDM generator in FIG. 1.

FIG. 9 is a diagram illustrating still another embodiment of the PDM generator in FIG. 1.

The present invention relates to an organic electroluminescent display device and an information device having a double-sided light emitting display panel, wherein each panel can be operated in a normal operation mode and a low power mode at the same time or at different times. An organic electroluminescent display device and an information device.

In general, an organic light emitting display device is a self-luminous display that electrically excites an organic compound to emit light, which can be driven at low voltage, is easy to thin, and has been pointed out as a problem in liquid crystal display devices such as wide viewing angle and fast response speed. It is attracting attention as the next generation display that can solve the shortcomings. In the organic light emitting display, an organic layer having a predetermined pattern is formed on glass or other transparent insulating substrate, and electrode layers are formed on upper and lower portions of the organic layer. The organic layer consists of an organic compound. In the organic light emitting display device configured as described above, as the anode and cathode voltages are applied to the electrodes, holes injected from the electrode to which the anode voltage is applied are moved to the light emitting layer via the hole transport layer, and the electrons have a cathode voltage. It is injected from the applied electrode into the light emitting layer via the electron transport layer. In this light emitting layer, electrons and holes recombine to produce excitons, and as the excitons change from the excited state to the ground state, the fluorescent molecules in the light emitting layer emit light to form an image.

In recent years, as the demand for clamshell information devices has soared, there is an increasing expectation that light emission will occur on both sides of the organic electroluminescent display.

In the conventional double-sided organic light emitting display, two organic light emitting displays, which are finished products, are stacked on top and bottom of each other.

For example, Korean Patent Laid-Open Publication No. 2003-0019015 stacks two display devices on top and bottom like this, and shows a rear screen when the folder is closed and a front screen when the folder is open. Disclosed is a clamshell mobile communication terminal employing an organic electroluminescent display having an inverting function shown.

If two display panels are driven in such a display device, the driving method and the driving circuit are simple. However, each independent driving circuit is required, which increases the use of semiconductor chips, thereby increasing the area of the entire system.

In the case of a clamshell information device, when looking at one side of the folder, it is not common to see the panel on the other side. In this case, it is natural to operate the panel on the viewing side. However, operating the panel on the non-viewing side is a waste of electric power, so it should not be operated naturally.

In this case, when the two panels are used separately, the driving circuits are different from each other. Therefore, there is no problem in not driving one light emitting display panel that is not used.

However, when two panels are adjusted by one driving circuit, both panels may be turned on or off at the same time.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a double-sided organic light emitting display device capable of operating two light emitting display panels simultaneously or selectively in a low power mode.

Another object of the present invention is to provide an information device having a double-sided light emitting organic electroluminescent display which can operate two light emitting display panels simultaneously or selectively in a low power mode. .

According to an aspect of the present invention, there is provided an organic light emitting display device, including: a substrate; A sealing member for sealing one surface of the substrate; A first light emitting part disposed between the substrate and the sealing member; A second light emitting part disposed between the substrate and the sealing member; And a power supply voltage generator configured to supply power voltages to the first light emitting unit and the second light emitting unit, respectively, wherein the power supply voltage generator is configured to operate at least one of the first light emitting unit and the second light emitting unit in a low power mode. In response to a PDM (Power Down Mode) signal to operate, it characterized in that at least one of the power supply voltage supplied to the first light emitting unit and the second light emitting unit.

Information device for solving the other technical problem to be achieved by the present invention includes a body and a cover, an information device including a first light emitting portion provided on one side of the cover and a second light emitting portion provided on the other surface of the cover The power supply voltages supplied to the first light emitting unit and the second light emitting unit in response to a power down mode (PDM) signal for operating at least one of the first light emitting unit and the second light emitting unit in a low power mode. A power supply voltage generator configured to vary at least one of the power supply voltage generators; And both the first light emitting unit and the second light emitting unit may be operated in a normal operation mode, or both may be operated in a low power mode, and either one of the first light emitting unit and the second light emitting unit may be operated in the normal operation mode. And a PDM generator for outputting the PDM signal to operate the other in a low power mode.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a block diagram illustrating a configuration of an organic light emitting display device according to an exemplary embodiment of the present invention, and may be provided in an information device including a body and a cover.

Referring to FIG. 1, the organic light emitting display device includes a first light emitting unit 410, a second light emitting unit 420, scan drivers 430-1 and 430-2, a data driver 440, and a power supply voltage. Generator 450 and power down mode (PDM) generator 460.

As shown in FIG. 2, the first light emitting part 410 and the second light emitting part 420 are opposite to the substrate 100 and the substrate 100 and are sealed to the substrate 100 with the sealant 120. It can be interposed between 110, which embodies the image in different directions.

According to an exemplary embodiment of the present invention, when the organic light emitting display device is used as a foldable information device, the first light emitting unit 410 may implement a main image, and the second light emitting unit 420 may You can implement sub-images.

As shown in FIG. 2, the first light emitting part 410 and the second light emitting part 420 may be formed on opposite surfaces of the substrate 100 and the sealing member 110, respectively. Each of the first light emitting part 410 and the second light emitting part 420 may be a bottom emission type for implementing an image toward the substrate 100 and the sealing member 110 on which they are formed.

However, the present invention is not necessarily limited thereto, and as shown in FIG. 3, after both the first light emitting part 410 and the second light emitting part 420 are formed on the substrate 100, the sealant 120 is formed. It may also be applied to an embodiment in which the substrate 100 and the sealing member 110 are bonded by the same. In this case, the first light emitting unit 410 may be a top emission type in which an image is realized in the direction of the sealing member 110, and the second light emitting unit 420 may be in the direction of the substrate 100. As a result, it may be a bottom emission type for implementing an image.

The substrate 100 may be glass material, for example polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyether sulfone (PES), polyether imide (polyether) imide, polyphenylene sulfide (PPS), polyallylate, polyimide, polycarbonate (PC), cellulose tri acetate (TAC), cellulose acetate propinonate Plastic material such as CAP) and, in some cases, metal material such as SUS.

Like the substrate 100 described above, the sealing member 110 may be provided with a glass material, a plastic material, or a metal material. In addition, any member may be applied as long as it can seal the substrate 100. .

Between the substrate 100 and the sealing member 110, a moisture absorbent 130 for adsorbing moisture and oxygen in the space between the substrate 100 and the sealing member 110 is positioned.

The first light emitting unit 410 and the second light emitting unit 420 may be provided with the pixels shown in FIGS. 4 to 6.

FIG. 4 is a circuit diagram of one pixel that may be provided in the first light emitter 410 and the second light emitter 420. FIG. 5 is a diagram illustrating four pixels adjacent to each other among pixels implementing the circuit. A partially enlarged plan view, and FIG. 6 is a cross-sectional view taken along line II of FIG. 5.

Each pixel of an active matrix organic light emitting display device according to an exemplary embodiment of the present invention includes at least two thin film transistors of a first TFT M1 for switching, a second TFT M2 for driving, and a storage capacitor. (Cst) and one organic electroluminescent element (OLED). The number of thin film transistors and capacitors as described above is not necessarily limited thereto, and of course, a larger number of thin film transistors and capacitors may be provided.

The first TFT M1 is driven by the scan signal S [n] applied to the scan line Scan to store the data signal D [m] applied to the data line Data and the storage capacitor Cst and It serves to deliver to the second TFT (M2). The second TFT M2 determines the amount of current flowing into the organic light emitting diode OLED according to the data signal transmitted through the first TFT M1. The storage capacitor Cst stores a data signal transmitted through the first TFT M1 for one frame.

The first TFT M1 and the second TFT M2 may be configured as shown in FIG. 6, which includes an active layer 21 formed on the substrate 100 and an active layer 21 of the active layer 21. The gate insulating film 12 formed thereon, the gate electrode 22 on the gate insulating film 12, and the source / drain electrode 23 insulated from the gate electrode 22 are provided. The buffer layer 11 may be formed on the substrate 100.

An inter-insulator 13 is formed on the gate electrode 22, and the source / drain electrodes 23 are in contact with the source region and the drain region of the active layer 21 through contact holes. do.

A passivation film 14 made of an insulating material is formed on the source / drain electrodes 16 and 17, and a pixel definition film 16 is formed on the passivation film 14. The passivation film 14 may be formed in a single layer or a multilayer structure.

The TFT may be a silicon-based TFT in which the active layer 21 is formed of single crystal silicon or polycrystalline silicon, or an organic TFT in which the active layer 21 is formed of an organic semiconductor may be used.

In addition, the structure of the TFT, in addition to the above-described laminated structure can be applied to all of the various laminated structure is a matter of course.

Meanwhile, an organic light emitting diode OLED is connected to the drain electrode 23, and is connected to a pixel electrode 21 that becomes an anode of the organic light emitting diode OLED. The pixel electrode 21 is formed on the passivation film 14, and an insulating pixel definition film 16 is formed on the pixel electrode 21, and a predetermined opening 16a is formed in the pixel definition film 16. After forming, an organic electroluminescent element (OLED) is formed.

The organic light emitting diode OLED displays predetermined image information by emitting red, green, and blue light according to the flow of current. The organic light emitting diode OLED is connected to the drain electrode 21 of the TFT. Is provided to cover the entire pixel, the counter electrode 33 supplied with the cathode voltage Vss lower than the driving voltage Vdd, and the pixel electrode 31 and the counter electrode. It consists of the organic layer 32 arrange | positioned between 33, and emitting light.

The pixel electrode 31 may be configured in various ways. For example, when the pixel electrode 31 operates as an anode electrode and has a bottom emission type, the pixel electrode 31 may be a transparent electrode made of a transparent conductive material such as ITO, IZO, ZnO, or In 2 O 3. In the case of a top emission type, it may be composed of a reflective electrode including Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, and a compound thereof, and a transparent electrode formed thereon. Various modifications are possible, including, but not limited to, layers, bilayers, and the like.

The organic layer 32 may be a low molecular or high molecular organic layer. When the low molecular organic layer is used, a hole injection layer (HIL), a hole transport layer (HTL), and an organic emission layer (EML) may be used. , Electron Transport Layer (ETL), Electron Injection Layer (EIL), etc. may be formed by stacking in a single or complex structure, and the usable organic materials may be copper phthalocyanine (CuPc), N, N-di (naphthalen-1-yl) -N, N'-diphenyl-benzidine (N, N'-Di (naphthalene-1-yl) -N, N'-diphenyl-benzidine: NPB), Tris Various applications include, for example, tris-8-hydroxyquinoline aluminum (Alq3). These low molecular weight organic layers are formed by the vacuum deposition method. In the case of the high molecular organic layer, it may have a structure which is usually provided with a hole transport layer (HTL) and a light emitting layer (EML), wherein PEDOT is used as the hole transport layer, and poly-phenylenevinylene (PPV) and polyflu as the light emitting layer. Polymeric organic materials such as ore (Polyfluorene) are used and can be formed by screen printing or inkjet printing.

Similarly, in the case of the pixel electrode 31, the counter electrode 33 may have various configurations depending on the polarity and the light emission type of the electrode layer. That is, when the counter electrode 33 acts as a cathode and the light emission type is a bottom emission type, the counter electrode 33 is formed of Li, Ca, LiF / Ca, LiF / Al, Al, Ag, Mg, and compounds thereof. One or more layers may be formed of a material having a small work function, and in the case of a top emission type, one surface of the organic layer 330 may include Li, Ca, LiF / Ca, LiF / Al, Al, Ag, Mg, and a compound thereof. After forming an electrode to match the work function on the substrate, a transparent electrode such as ITO, IZO, ZnO, In2O3, or the like may be formed thereon, and the counter electrode 33 may be entirely formed, but is not limited thereto. You can also take Meanwhile, in the above-described embodiment, the case in which the pixel electrode 31 acts as the anode electrode and the counter electrode 33 acts as the cathode electrode has been described, but various configurations are possible, such as having opposite polarities.

The structure of the TFT structure and the organic light emitting diode (OLED) as described above is not necessarily limited to the above embodiment, embodiments of various structures are applicable.

The configuration of the pixel is not necessarily limited thereto, and may be variously modified.

Referring back to FIG. 1, in the organic light emitting display device of the present invention, the scan signal is supplied to the first scan driver 430-1 and the second emitter 420 to supply a scan signal to the first light emitting unit 410. It may include a second scan driver (430-2) for supplying. The first light emitter 410 and the second light emitter 420 may share a single data driver 440. However, the present invention is not limited thereto, and may include a data driver separately.

A power supply voltage generator 450 is provided to supply power voltages such as a driving voltage Vdd and a cathode voltage Vss to the first light emitting unit 410 and the second light emitting unit 420. According to an exemplary embodiment of the present invention as shown in FIG. 1, the power supply voltage generator 450 supplies the first driving voltage Vdd1 and the first cathode voltage Vss1 to the first light emitting unit 410. Then, the second driving voltage Vdd2 and the second cathode voltage Vss2 are supplied to the second light emitting unit 420.

The power supply voltage generator 450 may respond to a PDM signal supplied from the PDM generator 460, that is, a power control signal, and thus, the first light emitter 410 and the second light emitter 420. ) To change the power supply voltage. According to an exemplary embodiment of the present invention, the first and second cathode voltages Vss1 and Vss2 supplied to the first light emitting unit 410 and the second light emitting unit 420 are varied.

Here, the PDM signal may enable both the first light emitting unit 410 and the second light emitting unit 420 to operate in the normal operation mode, or to operate both in the low power mode, and the first light emitting unit 410 and the second light emitting unit. One of the light emitting units 420 may be operated in a normal operation mode while the other may be controlled to operate in a low power mode.

That is, the power supply voltage generator 450 supplies the first cathode voltage Vss1 and the second cathode voltage Vss2 supplied to the first light emitting unit 410 and the second light emitting unit 420 according to the PDM signal. By varying the control the operation of the first light emitting unit 410 and the second light emitting unit 420.

Accordingly, when both the first light emitting unit 410 and the second light emitting unit 420 are operated in the normal mode or the low power mode, the first cathode voltage Vss1 and the second cathode voltage Vss2 are equal. Be sure to Of course, corresponding voltage values of the first cathode voltage Vss1 and the second cathode voltage Vss2 in each mode will be different.

In addition, when the first light emitter 410 is operated in the normal mode, the second light emitter 420 is operated in the low power mode, or the second light emitter 420 is operated in the normal mode, and the first light emitter is operated. When the operation 410 is operated in a low power mode, the second cathode voltage Vss2 and the first cathode voltage Vss1 are higher than the first driving voltage Vdd1 or the second driving voltage Vdd2, respectively. The same value can be set so that the light emitting part is not driven in the low power mode. Of course, each voltage condition may exist in various ways, which will correspond to design changes within the scope of the present invention.

The PDM generator 460 generates a power down mode (PDM) signal for operating the first light emitter 410 and / or the second light emitter 420 in a low power mode, and outputs it to the power voltage generator 450. .

The PDM generator 460 outputs a PDM signal that enables both the front light emitting display panel 410 and the back light emitting display panel 420 to operate in a normal operation mode or to operate in a low power mode, or the front light emitting display. One of the panel 410 and the rear light emitting display panel 420 outputs a PDM signal for operating in the normal operation mode and the other for operating in the low power mode.

The PDM generator 460 for generating a PDM signal may be implemented in various embodiments, and the present invention will be described with reference to FIGS. 7 to 9. 7 to 9, the light emitting display panel provided on one surface of the cover 610 is called the first light emitting unit 410, and the light emitting display panel provided on the other surface of the cover 610 is called the second light emitting unit 420. Assume

FIG. 7 illustrates an embodiment of the PDM generator 460 of FIG. 1. In FIG. 7A, the PDM generator 460 includes a magnet 460-1 and a magnet sensor 460-2.

In FIG. 7A, the magnet 460-1 is provided on any part of one surface of the cover 610 of the information device shown in FIG. 7B, and the magnet sensor 460-2 encounters the magnet 460-1. It is provided on one surface of the body 600, and detects the magnetic field of the magnet 460-1 to output the PDM signal.

As the body 600 and the cover 610 of the information device are closer, the intensity of the magnetic field detected by the magnet sensor 460-2 becomes larger, and as shown in FIG. 7A, the body 600 and the cover 610 are When fully opened, the strength of the magnetic field detected by the magnet sensor 460-2 is minimized, and when the body 600 and the cover 610 are completely closed as shown in FIG. 7B, the magnet sensor 460-2 detects. The strength of the magnetic field is at its maximum.

The magnet sensor 460-2 outputs the detected magnetic field strength as a PDM signal. When the intensity of the magnetic field generated by the magnet 460-1 sensed by the magnet sensor 460-2 is equal to or less than a predetermined value, it is determined as shown in FIG. 7B where the body 600 and the cover 610 are opened. The first light emitting unit 410 operates in the normal mode, and the second light emitting unit 420 outputs the PDM signal for operating in the low power mode.

The power supply voltage generator 450 receiving the PDM signal has a first value lower than the first driving voltage Vdd1 and the second driving voltage Vdd2 so that the first light emitting unit 410 operates in the normal mode. The second cathode voltage Vss2 equal to or higher than the first driving voltage Vdd1 and the second driving voltage Vdd2 to supply the cathode voltage Vss1 and to operate the second light emitting unit 420 in the low power mode. ).

However, if the intensity of the magnetic field generated by the magnet 460-1 detected by the magnet sensor 460-2 is greater than or equal to a certain value, it is determined that the body 600 and the cover 610 are closed as shown in FIG. 7C. The first light emitter 410 is operated in a low power mode, and the second light emitter 420 outputs a PDM signal for operating in a normal mode.

The power supply voltage generator 450 receiving the PDM signal may have a first equal to or higher than the first driving voltage Vdd1 and the second driving voltage Vdd2 such that the first light emitting unit 410 operates in a low power mode. The cathode voltage Vss1 is supplied, and the second cathode voltage Vss2 lower than the first driving voltage Vdd1 and the second driving voltage Vdd2 is supplied to operate the second light emitting unit 420 in the normal mode. do.

FIG. 8 is a diagram illustrating another embodiment of the PDM generator 460 in FIG. 1, wherein one terminal 460-3 of a predetermined switch provided on an arbitrary portion of one surface of the cover 610 as shown in FIG. 8A, and The other terminal 460-4 of the switch provided on one surface of the body 600 to meet the one terminal 460-3 of the switch.

When the body 600 and the cover 610 are opened as shown in FIG. 8A, one terminal 460-3 and the other terminal 460-4 of the switch are opened, and the body 600 and the cover 610 as shown in FIG. 8B. Is completely closed, one terminal 460-3 and the other terminal 460-4 of the switch are shorted.

The open or short signal of one terminal 460-3 and the other terminal 460-4 of the switch is output as a PDM signal. As shown in FIG. 8A, when one terminal 460-3 and the other terminal 460-4 of the switch are in an open state, the first light emitting unit 410 operates in the normal mode, and the second light emitting unit 420 is operated. Output a PDM signal to operate in a low power mode.

The power supply voltage generator 450 receiving the PDM signal may have a first cathode voltage lower than the first driving voltage Vdd1 and the second driving voltage Vdd2 so that the first light emitting unit 410 operates in the normal mode. Supply Vss1 and supply a second cathode voltage Vss2 equal to or higher than the first driving voltage Vdd1 and the second driving voltage Vdd2 so that the second light emitting unit 420 operates in the low power mode. do.

However, when one terminal 460-3 and the other terminal 460-4 of the switch are in a short state as shown in FIG. 8B, the first light emitting unit 410 is operated in a low power mode, and the second light emitting unit 420 is operated. ) Outputs a PDM signal to operate in normal mode.

The power supply voltage generator 450 receiving the PDM signal may have a first equal to or higher than the first driving voltage Vdd1 and the second driving voltage Vdd2 such that the first light emitting unit 410 operates in a low power mode. The cathode voltage Vss1 is supplied, and the second cathode voltage Vss2 lower than the first driving voltage Vdd1 and the second driving voltage Vdd2 is supplied to operate the second light emitting unit 420 in the normal mode. do.

FIG. 9 is a diagram illustrating still another embodiment of the PDM generator 460 in FIG. 1 and includes an arbitrary button 460-6 provided in the body 600. Any button 460-6 may add a new function to an existing button, or may be newly provided at an arbitrary position of the body 600.

A PDM signal is generated according to the number of inputs of any button 460-5 shown in FIG. For example, when the button 460-5 is input once, the first light emitting unit 410 outputs a PDM signal for operating in the normal mode, and when the button 460-5 is continuously input twice. The second light emitting unit 420 outputs a PDM signal for operating in the normal mode.

The power supply voltage generator 450 which receives the PDM signal for inputting the button 460-5 once to allow the first light emitting unit 410 to operate in the normal mode, returns the first light emitting unit 410 to the normal mode. The first driving voltage Vdd1 is lower than the first driving voltage Vdd1 and the second driving voltage Vdd2 to operate, and the first driving voltage Vdd1 is operated so that the second light emitting unit 420 operates in a low power mode. And a second cathode voltage Vss2 equal to or higher than the second driving voltage Vdd2.

However, the power supply voltage generator 450 receiving the PDM signal for continuously inputting the button 460-5 twice to operate the first light emitting unit 410 in the normal mode may be configured by the first light emitting unit 410. The first cathode voltage Vss1 equal to or higher than the first driving voltage Vdd1 and the second driving voltage Vdd2 is supplied to operate in the low power mode, and the second light emitting unit 420 operates in the normal mode. The second cathode voltage Vss2 lower than the first driving voltage Vdd1 and the second driving voltage Vdd2 is supplied.

In a preferred embodiment of the present invention, the variable cathode voltage is supplied in this way, because it is advantageous in terms of circuit layout and wiring layout than varying the drive voltage, but the present invention is not limited thereto. The circuit structure may be configured by varying the first driving voltage Vdd1 and the second driving voltage Vdd2.

As described above, the optimum embodiment has been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, the organic light emitting display device according to the present invention lays out the low power voltage lines supplied to the front light emitting display panel and the bottom light emitting display panel from each other, and lays out the voltage level of the low power supply voltage supplied to each panel. The front panel and rear panel display panel can be operated in low power mode at the same time or at different times to minimize the power consumption of the system as a whole.

Claims (16)

Board; A sealing member for sealing one surface of the substrate; A first light emitting part disposed between the substrate and the sealing member; A second light emitting part disposed between the substrate and the sealing member; And And a power supply voltage generator configured to supply power voltages to the first light emitting unit and the second light emitting unit, respectively. The power supply voltage generator, At least one of power voltages supplied to the first light emitting unit and the second light emitting unit in response to a PDM (Power Down Mode) signal for operating at least one of the first light emitting unit and the second light emitting unit in a low power mode. An organic light emitting display device characterized by varying one. The method of claim 1, wherein the PDM signal is Both the first light emitting unit and the second light emitting unit may be operated in the normal operation mode, or both may be operated in the low power mode, and either one of the first light emitting unit and the second light emitting unit may be operated in the normal operation mode. And a signal for controlling the other to operate in a low power mode. The method of claim 1, wherein the power supply voltages A first driving voltage supplied to the pixel electrode and the counter electrode of the first light emitting unit, a first electrode voltage, A second driving voltage and a second electrode voltage supplied to the pixel electrode and the counter electrode of the second light emitting unit, respectively; And the power supply voltage generator varies at least one of the first electrode voltage and the second electrode voltage in response to the PDM signal. The method of claim 3, wherein the power supply voltage generator When the operating modes of the first light emitting unit and the second light emitting unit are the same, the first electrode voltage and the second electrode voltage are the same voltage, And when the operation modes of the first light emitting part and the second light emitting part are different from each other, the first electrode voltage and the second electrode voltage to have different voltages. The method of claim 3, wherein the power supply voltage generator And a first power supply voltage and a second power supply voltage having the same voltage as the first light emitting unit and the second light emitting unit. The method according to any one of claims 1 to 5, And the first light emitting part and the second light emitting part implement images in different directions. An information device including a body and a cover, and comprising a first light emitting part provided on one side of the cover and a second light emitting part provided on the other side of the cover. At least one of power voltages supplied to the first light emitting unit and the second light emitting unit in response to a PDM (Power Down Mode) signal for operating at least one of the first light emitting unit and the second light emitting unit in a low power mode. A power supply voltage generator for changing one; Both the first light emitting unit and the second light emitting unit may be operated in the normal operation mode, or both may be operated in the low power mode, and either one of the first light emitting unit and the second light emitting unit may be operated in the normal operation mode. And a PDM generator for outputting the PDM signal to operate the other in a low power mode. The method of claim 7, wherein the power supply voltages A first driving voltage supplied to the pixel electrode and the counter electrode of the first light emitting unit, a first electrode voltage, A second driving voltage and a second electrode voltage supplied to the pixel electrode and the counter electrode of the second light emitting unit, respectively; And the power supply voltage generator varies at least one of the first electrode voltage and the second electrode voltage in response to the PDM signal. The method of claim 8, wherein the power supply voltage generator When the operating modes of the first light emitting unit and the second light emitting unit are the same, the first electrode voltage and the second electrode voltage are the same voltage, And when the operation modes of the first light emitting unit and the second light emitting unit are different from each other, wherein the first electrode voltage and the second electrode voltage are different from each other. The method of claim 8, wherein the power supply voltage generator And the first power supply voltage and the second power supply voltage having the same voltage are supplied to the first light emitting portion and the second light emitting portion. The method according to any one of claims 7 to 10, And the first light emitting unit and the second light emitting unit implement images in different directions. The method of claim 7, wherein the PDM generator A magnet provided on any part of one surface of the cover; And And a sensor provided on one surface of the body that meets the magnet and sensing a magnetic field of the magnet. The method of claim 12, wherein the PDM generator If the intensity of the magnetic field sensed by the sensor is greater than or equal to a certain value, the second light emitting unit outputs the PDM signal for operating in the normal mode, the first light emitting unit operating in the low power mode, and the sensor detects And when the intensity of one magnetic field is equal to or less than a predetermined value, outputting the PDM signal to operate the first light emitter in a normal mode and the second light emitter to operate in a low power mode. The method of claim 7, wherein the PDM generator One terminal of a predetermined switch provided at any part of one surface of the cover; And And the other terminal of the switch provided on one surface of the body so as to meet one terminal of the switch. 15. The apparatus of claim 14, wherein the PDM generator When the switch is in a short state, the second light emitting unit outputs the PDM signal for operating in the normal mode and the first light emitting unit operates in the low power mode. When the switch is open, the first light emitting unit is normal. Mode of operation, wherein the second light emitting unit outputs the PDM signal to operate in a low power mode. The method of claim 7, wherein the PDM generator It includes a separate button provided on one side of the body, And the PDM signal for causing the first light emitting unit or the second light emitting unit to operate in the normal mode or the low power mode according to the number of times of input of the button.

Images