JP4556814B2 - Device, device driving method, and electronic apparatus - Google Patents

Description

  The present invention relates to an apparatus, a driving method of the apparatus, and an electronic apparatus.

  An organic electroluminescence (OEL) element includes a light emitting material layer sandwiched between an anode layer and a cathode layer. This element operates electrically like a diode. Optically, this element emits light at the time of forward bias, and the light emission intensity increases as the forward bias current increases. A display panel can be constructed using a matrix of organic electroluminescent elements built on a transparent substrate with at least one transparent electrode layer. By using a low-temperature polysilicon thin film transistor (thin film transistor) technology, a driving circuit can be integrally provided on the panel.

  In a basic analog driving system for an active matrix organic electroluminescence display (for example, Patent Document 1), in principle, at least two transistors are required per pixel (FIG. 1). T1 selects a pixel, and T2 converts the data voltage signal into a drive current for causing the organic electroluminescence element (OELD) to emit light with a specified luminance. The data signal is stored in a storage capacitor Cstorage when no pixel is selected. Each figure shows a P-channel thin film transistor, but the same principle can be applied to a circuit using an N-channel thin film transistor.

  There are problems with thin film transistor analog circuits, and organic electroluminescent devices do not behave exactly like diodes. However, the luminescent material has relatively uniform characteristics. Due to the thin film transistor manufacturing method, there is a spatial variation in the characteristics of the thin film transistor throughout the panel. One of the most important considerations in thin film transistor analog circuits is the variation in threshold voltage ΔVt between devices. As a result of such variations in organic electroluminescent displays resulting from not exhibiting a complete diode behavior, the brightness of the pixels across the display panel is non-uniform. This significantly impairs image quality. For this reason, a built-in circuit for compensating for variations in transistor characteristics is required.

  The circuit shown in FIG. 2 (for example, Patent Document 2) is cited as one of built-in circuits for compensating for variations in transistor characteristics. In this circuit, T1 is for selecting a pixel. T2 functions as analog current control and supplies drive current. T3 connects the drain and gate of T2 and switches T2 to a diode or saturated state. T4 operates as a switch. Only one of T1 and T4 is turned on at any time. In the initial state, T1 and T3 are off and T4 is on. When T4 is turned off, T1 and T3 are turned on, and a current with a predetermined value can flow into the organic electroluminescence device (OELD) through T2. The threshold voltage of T2 is measured with T2 operating as a diode (T3 is on), at which time programming current can flow into the organic electroluminescent device via T1 and T2. This is the programming stage. T3 short-circuits between the drain and gate of T2, and switches T2 to the diode state. The threshold voltage detected at T2 is stored in the capacitive element C1 connected between the gate and source terminals of T2 when T3 and T1 are off. When T4 is turned on, current is now supplied by VDD. If the slope of the output characteristic is flat, the regenerated current will be equal to the programmed current whatever the threshold voltage detected for T2. By turning on T4, the drain-source voltage of T2 is raised, and as a result, the re-production current is kept equal to the program current due to the flatness of the output characteristics. Note that ΔVT2 shown in FIG. 2 is virtual and not real.

  In the active programming stage shown in the timing chart of FIG. 2 in the range from t2 to t5, a constant current is theoretically supplied. The production stage begins at t6.

International Publication No. WO98 / 36407 Pamphlet Special table 2002-51432 gazette

  While the circuit of FIG. 2 is effective, there is still a need for reduced power consumption. In particular, providing a current source in the circuit of FIG. 2 requires a bias voltage VBIAS in addition to the supply voltage VDD. The supply voltage VDD can be increased to the required bias voltage VBIAS. This has the effect of reducing the number of components, but the power consumption of the entire system is still increased when programming any value of data current (IDAT).

  In the present invention, attention is paid to the fact that all current passing through the circuit of FIG. 2 passes through the organic electroluminescent element. How important this is to the present invention will become apparent from the following description.

  A first device according to the present invention includes a drive circuit and a data line for supplying a data current, and the drive circuit controls a current value of a drive current supplied to a current drive element. And a first switching transistor that connects the driving transistor to a current sink through the data line.

  A second device according to the present invention includes a data line, a drive circuit, a data line for supplying a data current, and a current sink connected to the data line, wherein the drive circuit is current driven A driving transistor that controls a current value of a driving current supplied to the element; a capacitive element connected to a gate of the driving transistor; a first switching transistor that controls conduction between the capacitive element and the data line; The capacitor element stores charges according to a data current.

  A third device according to the present invention includes a data line, a drive circuit, and a data line for supplying a data current, and the drive circuit determines a current value of the drive current supplied to the current drive element. A drive transistor to be controlled; a capacitive element connected to a gate of the drive transistor; and a first switching transistor that controls conduction between the capacitive element and the data line, and an operating voltage of the drive transistor is: It is set by a data current flowing from the power supply voltage through the data line and the first switching transistor.

  In the above apparatus, it is preferable that the data current passes through the driving transistor during a program stage.

  In the above apparatus, it is preferable that the driving circuit further includes a second switching transistor that controls conduction between the current driving element and the driving transistor.

  In the above apparatus, it is preferable that the first switching transistor and the second switching transistor are controlled by control signals independent of each other.

  In the above apparatus, it is preferable that the drive current is supplied to the current drive element during a re-production stage.

  In the above device, the first switching transistor may have a multi-gate structure.

  In the above device, the first switching transistor may have an LDD structure.

  In the above apparatus, the drive circuit may further include a third switching transistor that controls conduction between the drain of the drive transistor and the gate of the drive transistor.

  In the above device, the current sink is preferably connected to ground or a reference voltage.

  In the above device, the current driving element may be an electroluminescence element.

  In the above apparatus, the data current may not flow through the current driving element.

A driving method of a device according to the present invention includes a driving circuit and a data line, and the driving circuit includes a first transistor, a second transistor, and a capacitive element connected to a gate of the first transistor. , And storing a charge corresponding to the data current in the capacitive element by flowing a data current from a power supply voltage to a current sink via the second transistor and the data line. The driving current having a current value corresponding to the charge accumulated in the capacitor element is supplied to the current driving element.
An electronic apparatus can be configured using the above-described apparatus.

  According to a first aspect of the present invention, there is provided a drive circuit that operates in a stage having a programming stage and a reproduction stage, the circuit comprising a plurality of current paths each passing through the circuit, a current drive element, A transistor connected to operate for controlling the current supplied to the element, a capacitive element connected to store an operating voltage of the transistor during a programming stage, and a switch means for controlling the current path In this arrangement, a drive circuit is provided in which one of the current paths does not include the element.

  According to a second aspect of the present invention, there is provided a driving circuit for driving a pixel of an EL (electroluminescence) device, wherein the pixel has an electroluminescence element, and the circuit supplies the electroluminescence element. A transistor connected to operate to control the current being passed, a capacitive element connected to store the operating voltage of the transistor during a programming stage, and passing through the transistor during operation during the programming stage First switch means for generating a current path for generating current, and second switch means for generating a current path for passing through the transistor and the electroluminescent element during operation in a reproduction stage. Means are current paths in the programming stage Driving circuit is provided to be connected so as not to pass through the electroluminescent element.

  According to a third aspect of the present invention, there is provided a driving circuit for driving a pixel of an electroluminescence device, wherein the pixel has an electroluminescence element, and the circuit includes a current supplied to the electroluminescence element. A transistor connected to operate for control, a capacitive element connected to store an operating voltage of the transistor during a programming stage, and a current path through the transistor during operation during the programming stage A first switch means for generating a current path; a second switch means for generating a current path through the transistor and the electroluminescent element during operation during the re-production stage; and a current sink. , The first switch means is the programming Driving circuit is provided that the current path in the stage is characterized in that it is connected so as to communicate with the previous period current sink through the transistor.

  According to a fourth aspect of the present invention, there is provided a method for controlling current supply to an electroluminescent device, the method comprising: providing a current path that does not pass through the electroluminescent device during a programming stage; Providing a current path through the electroluminescent device.

  According to a fifth aspect of the present invention, there is provided a method for controlling current supply to an electroluminescent device, comprising providing a current path connected to a current sink during a programming stage, and during a reproduction stage. Providing a current path through the electroluminescent device.

  According to a sixth aspect of the present invention, there is provided an electroluminescence display device comprising one or more drive circuits according to any one of the first to third aspects of the present invention.

  According to the seventh aspect of the present invention, there is provided an electronic apparatus using the electroluminescence display device according to the sixth aspect of the present invention.

  According to an eighth aspect of the present invention, there is provided a circuit having a current driving element, the circuit including a first current path including the current driving element and a second current path not including the current driving element. Is provided.

According to a ninth aspect of the present invention, there is provided a circuit having a current driving element, the circuit including a first current path for passing a current passing through the current driving element, and a current passing through the current driving element. And a second current path that does not conduct current.
According to a tenth aspect of the present invention, there is provided a method of driving a circuit comprising a current driving element and a transistor for controlling current supply to the current driving element, wherein the transistor is driven based on a predetermined current. A method is provided that includes determining a gate voltage.

  It will be noted that according to the present invention, during the programming stage, there is no current supply to the current drive element by the current control transistor. In the electroluminescence device of the present invention, a pixel driving circuit can be realized without deteriorating the quality of an image displayed by the electroluminescence device. In the present invention, in the programming stage and the re-production stage, an equal current is supplied, and there is an effect of reducing the total power consumption as compared with the prior art. Furthermore, while the prior art required a high bias voltage, the circuit of the present invention can be operated with a normal supply voltage. In fact, the present invention allows the programming current path and the re-production current path to be separated. Thereby, many effects can be obtained. For example, if there is no current passing through the organic electroluminescence element in the programming stage, the programming stage can be operated at a higher speed. This is because such a configuration can prevent the speed reduction caused by the parasitic capacitance of the organic electroluminescence element.

  Embodiments of the present invention will be further described by way of example with reference to the accompanying drawings. These are merely examples.

  A pixel drive circuit according to the first embodiment of the present invention is shown in FIG. The transistor T2 operates as an analog current controller that supplies a drive current to the organic electroluminescence element (OELD). The storage capacitor element (storage capacitor) C1 is connected between the gate and source of the transistor T2. In the circuit of FIG. 2, during the programming stage, a current source is connected to the source of the transistor T2 via the transistor T1, so that current is supplied to the organic electroluminescent element. In this embodiment according to the invention, transistor T1 connects transistor T2 to the current sink during the programming stage. That is, in the present invention, the current flowing through the organic electroluminescence element via T2 during the programming stage is zero. In the circuit of FIG. 3, the drain of the transistor T2 is connected to the source of the transistor T1 via the source-drain path of the transistor T3. The source of the transistor T1 is connected to the gate of the transistor T2, and the gates of the transistors T1 and T3 are connected to each other. A programming voltage Vp is applied to the gates of T1 and T3. Transistor T4, which is turned off during the programming stage, connects the drain of T2 and the source of T3 to an organic electroluminescent device (OELD). During the programming stage, transistor T1 connects transistor T2 to a current sink connected to ground or a reference voltage.

  The circuit of FIG. 3 operates during the programming stage with T4 off and T1 and T3 on. The on state T3 has the effect of operating T2 as a diode. T1 also connects this diode to the data current sink. As a result, the capacitive element C1 accumulates (accumulates charges) (or discharges depending on the voltage accumulated during the previous frame). The capacitive element C1 stores electricity according to the gate-source voltage of the transistor T2, and as a result, corresponds to the voltage (VGS2, data current IDAT) that controls the current supply to the organic electroluminescence element during the reproduction stage. ). At the end of the programming stage, T1 and T3 are off. For the remaining period of this frame, voltage VGS2 is stored in C1. As can be readily understood from the circuit diagram and this description, according to the present invention, no bias voltage is particularly required to provide a current source. That is, the supply voltage (VDD) in FIG. 3 is determined by T2 and the organic electroluminescence element, and a high voltage for the power of the current source is not particularly required. The voltage required for this circuit is at most clearly smaller than that required for the circuit of FIG.

  At the start of the programming stage when T4 is off, the organic electroluminescent element (OELD) exhibits a parasitic capacitance phenomenon that is discharged through the device. The storage speed of C1 determines the time taken for the programming stage. In the circuit according to the embodiment of the present invention, the capacity of C1 can be made relatively small, so that power storage is performed at a very high speed. As a result, the period during which no current is supplied from the T2 to the organic electroluminescence element is very short compared to the entire frame. From these and the afterimage effect of the human eye, no recognizable deterioration occurs in the displayed image.

  After C1 is charged and T3 is turned off, the off-resistance of T3 can be important because the off-resistance of T3 can affect the voltage applied to C1 for the remainder of this frame. . Therefore, it is desirable that the gate-source capacitance of T3 is smaller than that of C1.

  Reproduction voltage VR is applied to the gate of transistor T4. At the beginning of the re-production stage in the circuit of FIG. 3, T4 is on and T1 and T3 remain off. As a result, T2 operates as a current source by VGS2 biased by C1, and supplies current to the organic electroluminescence element. At the end of the re-production stage, T4 is turned off and T1 and T3 remain off. This ends one cycle. This drive waveform is shown in FIG.

  FIG. 4 shows a second embodiment according to the present invention. The circuit of FIG. 4 is different from the circuit of FIG. 3 in the connection form of the transistor T3. In the circuit of FIG. 4, T1 is connected to C1 via the drain-source path of T3. The circuit of FIG. 4 is preferred over the circuit of FIG. 3 in that T3 is not on the current path during the programming stage. In other operations and effects, the second embodiment is the same as the first embodiment.

  FIG. 5 is a circuit diagram showing a number of pixels in an active matrix display. Each pixel is realized in accordance with the circuit shown in FIG. For simplicity of illustration, a monochrome display device is shown. Since this circuit is of an active matrix type, pixels in the same row are selected simultaneously. Transistor T3 is responsible for pixel selection. Therefore, the source terminal of T3 is connected to a current data line shared by the pixel columns. For this reason, it is necessary to minimize the leakage current of T3. By using a multi-gate structure for T1, leakage current can be reliably minimized. In addition to the multi-gate structure, the leakage current can be further reduced by using the LDD structure.

  FIG. 6 is a schematic cross-sectional view illustrating a mounted state of a pixel driving circuit in a certain organic electroluminescence element device. In FIG. 6, reference numeral 132 represents a hole injection layer, reference numeral 133 represents an organic electroluminescence layer, and reference numeral 151 represents a resistor or a separator. The switching thin film transistor 121 and the n-channel type current thin film transistor 122 have a top-gate structure or a maximum temperature of 600 degrees Celsius as used in, for example, a known thin film transistor liquid crystal display device. A structure and method commonly used for low-temperature polysilicon thin film transistors, such as a manufacturing method of less than 1 degree, are employed. However, other structures and methods can be used.

  The forward oriented organic electroluminescence display element 131 includes an aluminum pixel electrode 115, an opposing electrode 116 made of ITO, a hole injection layer 132, and an organic electroluminescence layer 133. In the in-place organic electroluminescence display element 131, the direction of the current of the organic electroluminescence display device can be set to the direction from the opposing electrode 116 made of ITO to the aluminum pixel electrode 115.

  The hole injection layer 132 and the organic electroluminescence layer can be formed by an ink jet printing method using the resistor 151 as a separation structure between pixels. The opposing electrode 116 made of ITO can be formed by sputtering. However, other methods can be used to form all of these components.

  A typical layout of the entire display panel using the present invention is schematically shown in FIG. The panel includes an active matrix organic electroluminescent device 200 having analog current programmed pixels, an integrated thin film transistor scan driver 210 having a level shifter, a flexible TAB tape 220, and an integrated RAM / controller. The external analog driver LSI 230 is attached. Of course, this is only one example of a panel configuration that can be realized using the present invention.

  The structure of the organic electroluminescence display device is not limited to the above. Other structures are also applicable.

  For example, referring to the circuit of FIG. 3, it can be seen that the present invention provides a data current source (in this example for an organic electroluminescent device). This circuit can easily be expanded to provide an amplified and / or multi-level (current) output. The principle of such a circuit can be understood with reference to FIG. The circuit of FIG. 8 includes an additional driving transistor T5 and an additional switching transistor T6 in addition to the circuit of FIG. The source of T5 is connected to VDD, and the same drive voltage signal as that of the gate of the transistor T2 is applied to its gate. The drain of the transistor T5 is connected in series with the drain of the transistor T6, and the source of T6 is connected to the common connection point of the transistors T2, T3, and T4. The gate of the transistor T6 is connected to the gate of the transistor T4. When it is assumed that the characteristic of the transistor T2 is W / L and the characteristic of the transistor T5 is selected to be (N−1) W / L, the following current amplification is obtained.

  Iout = Iin × NIin is the current flowing through the current sink, that is, the IDAT in FIGS. Iout is a current flowing through the organic electroluminescence element. Therefore, when the circuit of FIG. 8 is used, the value of IDAT can be reduced while keeping the current passing through the organic electroluminescence element equal as compared with the circuits of FIGS. By reducing the value of IDAT, there is an effect of increasing the operation speed of the circuit. Further, by reducing the IDAT value, there is an effect of reducing transmission loss that occurs while passing through the pixel matrix. This effect is particularly important for large display panels.

  Of course, additional circuit stages comprising additional transistors T5 and T6 can be added. As shown in FIG. 9 (A, B, etc.), various current values passing through the organic electroluminescent element can be selected by a switching transistor T6 connected in series and receiving individual gate drive signals. As a result, the brightness of the output light can be specified in various ways.

  The circuits shown in FIGS. 3 to 9 are preferably realized by using a thin film transistor (thin film transistor) technique, and most preferably a polysilicon thin film transistor.

  The present invention is particularly effective for small portable electronic devices such as mobile phones, computers, CD players, and DVD players. Of course, it is not limited to these.

  Several electronic devices using the above-described organic electroluminescence display device will be described below.

<1: Mobile computer>
An example of a mobile personal computer to which a display device according to one of the above embodiments is applied will now be described.

  FIG. 10 is an isometric view showing the configuration of this personal computer. In the figure, a personal computer 1100 includes a main body 1104 including a keyboard 1102 and a display unit 1106. The display unit 1106 is realized as described above using the display panel manufactured according to the present invention.

<2: Mobile phone>
Next, an example in which the display device of the present invention is applied to a display portion of a mobile phone will be described. FIG. 11 is an isometric view showing the configuration of the mobile phone. In the figure, the mobile phone 1200 includes a plurality of operation keys 1202, a speaker 1204, a microphone 1206, and the display panel 100. The display panel 100 is realized as described above using the display panel manufactured according to the present invention.

<3: Digital still camera>
Next, a digital still camera using an organic electroluminescence display device as a viewfinder will be described. FIG. 12 is an isometric view showing an outline of the configuration of the digital still camera and connection to an external device.

  A normal camera sensitizes an optical image of a subject to film, but the digital still camera 1300 generates an image signal from the optical image of the subject by photoelectric conversion using, for example, a charge coupled device (CCD). The digital still camera 1300 includes an organic electroluminescence element 100 that performs display based on an image signal from a CCD on the rear surface of the case 1302. Therefore, the display panel 100 functions as a finder that displays a subject. A light acceptance unit (photo acceptance unit) 1304 having an optical lens and a CCD is provided on the front surface (rear of the drawing) of the case 1302.

  When the photographer determines the subject image displayed on the organic electroluminescence element panel 100 and releases the shutter, the image signal from the CCD is transmitted and stored in the memory in the circuit board 1308. In the digital still camera 1300, a video signal output terminal 1312 and a data communication input / output terminal 1314 are provided on the side surface of the case 1302. As shown in the figure, a TV monitor 1430 and a personal computer 1440 are connected to a video signal terminal 1312 and an input / output terminal 1314, respectively, as necessary. By a predetermined operation, an image signal stored in the memory of the circuit board 1308 is output to the TV monitor 1430 and the personal computer 1440.

  Examples of electronic devices other than the personal computer shown in FIG. 10, the mobile phone shown in FIG. 11, and the digital still camera shown in FIG. 12 include organic electroluminescence element TV set, viewfinder type and monitoring type video tape recorder, car A navigation system, a pager, an electronic notebook, a calculator, a word processor, a workstation, a TV phone, a POS system terminal, a device with a touch panel, and the like. Of course, the organic electroluminescence device described above can be applied to the display portion of these electronic devices.

  The drive circuit of the present invention can be arranged not only in the pixels of the display unit but also outside the display unit.

  In the above description, the driving circuit of the present invention has been described using various display devices as examples. Applications of the drive circuit of the present invention are not limited to display devices, but include, for example, magnetoresistive RAMs, capacitance sensors, charge sensors, DNA sensors, night vision cameras, and many other devices. It is.

  FIG. 13 shows the application of the drive circuit of the present invention to a magnetic RAM. In FIG. 13, the magnetic head is indicated by reference numeral MH.

  FIG. 14 shows application of the drive circuit of the present invention to a magnetoresistive element. In FIG. 14, the magnetic head is indicated by reference numeral MH, and the magnetic register is indicated by reference numeral MR.

  FIG. 15 shows application of the drive circuit of the present invention to a capacitive sensor or a charge sensor. In FIG. 15, a sense capacitor element (sense capacitor) is indicated by a symbol Csense. The circuit of FIG. 15 can be applied to other uses such as a fingerprint sensor and DNA.

  FIG. 16 shows the application of the drive circuit of the present invention to a night vision camera. In FIG. 16, the photoconductor is denoted by the symbol R.

  In the embodiment shown in the specific description above, each transistor has been shown as a p-channel transistor. This is not a limiting element of the invention. For example, FIG. 17 shows a simple outline of a modification of the circuit of FIG. In the circuit of FIG. 17, an n-channel type transistor is used except that the driving transistor is left as a p-channel type.

  It will be apparent to those skilled in the art that various modifications and improvements can be made to the configuration described with respect to FIGS. 3 to 16 without departing from the scope of the present invention.

1 shows a conventional organic electroluminescence element pixel driving circuit using two transistors. 1 shows a known current-programmed organic electroluminescence element drive circuit having a threshold voltage compensation function. 1 shows a pixel drive circuit according to a first embodiment of the present invention. 3 shows a pixel drive circuit according to a second embodiment of the present invention. A plurality of pixels in a matrix display are shown. Each pixel uses the circuit of FIG. It is typical sectional drawing which shows the mounting state of the organic electroluminescent element and pixel drive circuit by one Embodiment of this invention. 1 is a schematic plan view of an organic electroluminescence display panel according to the present invention. 3 shows another embodiment of a pixel driving circuit according to the present invention. 3 shows another embodiment of a pixel driving circuit according to the present invention. It is a schematic diagram of a mobile personal computer using a display device having a pixel driving circuit of the present invention. It is a schematic diagram of a mobile phone using a display device having a pixel driving circuit of the present invention. It is a schematic diagram of a digital camera using a display device having a pixel driving circuit of the present invention. The application of the drive circuit of the present invention to a magnetic RAM is shown. The application to the magnetoresistive element of the drive circuit of this invention is shown. The application of the drive circuit of the present invention to a capacitive sensor or a charge sensor is shown. The application of the drive circuit of the present invention to a night vision camera is shown. An outline of a modification of the circuit of FIG. 4 is simply shown.

Explanation of symbols

T1, T2, T3, T4 Transistor C1 Storage capacity VP Program voltage VDD Supply voltage IDD Data current VR Reproduction voltage 132 Hole injection layer 133 Organic electroluminescence layer 151 Resistance 121 Switching thin film transistor 122 n-channel current thin film transistor 131 Organic electroluminescence display 115, 116 Pixel electrode 200 Active matrix type organic electroluminescence element 210 Thin film transistor scanning driver 220 Flexible TAB tape 230 External analog driver 1100 Personal computer 1200 Cellular phone 1300 Digital still camera

Claims (9)

A pixel drive circuit;
A data line for supplying a data current,
The pixel driving circuit includes:
A drive transistor for controlling the current value of the drive current supplied to the current drive element;
A capacitive element having one end Rutotomoni connected to the gate of the driving transistor and the other end connected to a power supply voltage,
A first switching transistor for controlling conduction between one end of the capacitive element and the data line;
A second switching transistor for controlling conduction between the current driving element and the driving transistor;
A third switching transistor for controlling conduction between the drain of the driving transistor and the gate of the driving transistor ;
The gate voltage of the driving transistor from the supply voltage, the driving transistor is set by the first switching transistor and the data current flowing through the data line,
Each of said first switching transistor and the second switching transistor, that that are controlled by mutually independent control signals,
A device characterized by. The apparatus of claim 1 , wherein
The drive current is supplied to the current drive element during a re-production stage;
A device characterized by. The apparatus according to claim 1 or 2 ,
The first switching transistor has a multi-gate structure;
A device characterized by. The apparatus according to any one of claims 1 to 3 ,
The first switching transistor has an LDD structure;
A device characterized by. The apparatus according to any one of claims 1 to 4 ,
Having a current sink for generating the data current, the current sink being connected to ground or a reference voltage;
A device characterized by. The apparatus according to any one of claims 1 to 5 ,
The current driving element is an electroluminescence element;
A device characterized by. The apparatus of claim 1.
The data current does not flow through the current driving element;
A device characterized by. And a data line for supplying a data current. The pixel drive circuit includes a drive transistor for controlling a current value of a drive current supplied to the current drive element, and one end of the pixel drive circuit. the Rutotomoni connected to the gate of the driving transistor, a driving method of a device comprising a capacitor element and the other end is connected to the power supply voltage, and
One end of the capacitive element and the data line are made conductive by a first switching transistor, the current driving element and the driving transistor are made non-conductive by a second switching transistor, and the driving is made by a third switching transistor. in a state where conduction between the gate of the drain and the drive transistor of the transistor, from the source voltage, the driving transistor via the first switching transistor and the data line by flowing the data current, the driving transistor Set the gate voltage
By said second switching transistor, said by conducting a current driven element and the driving transistor, and supplying the driving current to the current driven element,
Controlling each of the first switching transistor and the second switching transistor by a control signal independent of each other;
A method for driving an apparatus. The electronic device provided with the apparatus in any one of Claims 1 thru | or 7 .

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