JP2004219466A - Electronic circuit, electroluminescent display device, electrooptical device, electronic equipment, method of controlling current to organic electroluminescent pixel, and circuit driving method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of slow writing speed occurring when data current is reduced for the purpose of displaying low gradation. <P>SOLUTION: An electronic circuit is provided with a programming route and a reproduction route. The circuit includes a current driving element, a transistor arranged in a production route for the purpose of operating to control current to be supplied to the current driving element, a capacitative element arranged for storing operating voltage of the transistor, an additional transistor arranged parallel to the transistor in the production route so as to store the operating voltage in the capacitative element, and a switching means for controlling the programming route and the reproduction route. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The invention particularly relates to electronic circuits. One characteristic application of the electronic circuit is a circuit for driving a pixel of an organic electroluminescence device.
[0002]
BACKGROUND OF THE INVENTION
An organic electroluminescence (OEL) element has a light emitting material layer sandwiched between an anode layer and a cathode layer. This element operates electrically like a diode. This element optically emits light at the time of forward bias, and its emission intensity increases with an increase in forward bias current. A display panel can be constructed using a matrix of organic electroluminescent elements formed on a transparent substrate while having at least one transparent electrode layer. By using low-temperature polysilicon thin film transistor (thin film transistor) technology, an electronic circuit can also be integrally provided on this panel.
[0003]
The basic analog drive scheme for active matrix organic electroluminescent displays requires in principle at least two transistors per pixel (FIG. 1). T1 selects a pixel, and T2 converts a data voltage signal into a drive current for causing an organic electroluminescence element (OELD) to emit light at a specified luminance. When no pixel is selected, the data signal is stored in a storage capacitor Cstorage. Although each drawing shows a P-channel thin film transistor, the same principle can be applied to a circuit using an N-channel thin film transistor.
[0004]
Therefore, the present inventors have invented the pixel drive circuit (electronic circuit) shown in FIG. The transistor T2 operates as an analog current controller that supplies a drive current to an organic electroluminescence element (OELD). The storage capacitor (storage capacitor) C1 is connected between the gate and the source of the transistor T2. In the circuit of FIG. 2, 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. In this stage, the current flowing through the organic electroluminescence element via the transistor T2 is zero.
[0005]
The circuit of FIG. 2 operates during the programming stage with T4 off and T1 and T3 on. T3 in the ON state has an effect of operating T2 as a diode. T1 also connects this diode to the data current sink. As a result, the capacitive element C1 stores electricity (accumulates charges) (or discharges depending on the voltage accumulated during the previous stage). The capacitance element C1 stores a voltage according to the gate-source voltage of the transistor T2, and as a result, a voltage (VGS2, corresponding to the data current IDAT) that controls the current supply to the organic electroluminescence element during the re-production stage. ) To accumulate. At the end of the programming stage, T1 and T3 are off. Voltage VGS2 is stored on C1 for the remainder of the frame (ie, the re-production stage).
[0006]
After C1 has been charged and T3 has been turned off, the off-resistance of T3 can be important because the off-resistance of T3 can affect the voltage applied to C1 during the remainder of this frame. . Therefore, it is desirable that the gate-source capacitance of T3 be smaller than C1.
[0007]
The reproduction voltage VR is applied to the gate of the transistor T4. At the start of the re-production stage in the circuit of FIG. 2, 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 electroluminescent element. At the end of the reproduction stage, T4 is turned off and T1 and T3 remain off. This completes one cycle. This drive waveform is shown in FIG.
[0008]
It will be noted that according to the circuit shown in FIG. 2, during the programming stage, there is no current supply to the current driver by the current control transistor. According to 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, the path of the programming current and the path of the reproduction current can be separated. Thereby, many effects can be obtained. For example, if there is no current passing through the organic electroluminescent element in the programming stage, the programming stage can be operated at higher speed. This is because such a configuration can prevent a reduction in the speed caused by the parasitic capacitance of the organic electroluminescence element.
[0009]
Although the circuit of FIG. 2 is effective, there is still a need for lower power consumption. For this reason, recent improvements in the materials of organic electroluminescent elements have made it possible to drive even small currents.
[0010]
[Problems to be solved by the invention]
However, in particular, when expressing a low gradation, the data current IDAT needs to be extremely small in the programming stage, and a problem has arisen in that the speed of charging the storage capacitor C1 is reduced. In addition, when programming with a small data current IDAT, the manufacturing speed of the storage capacitor C1 and the data lines greatly affects the speed of charging the storage capacitor C1 and the amount of charge stored therein.
[0011]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided an electronic circuit having a programming path and a reproduction path, wherein the circuit operates to control a current driving element and a current supplied to the current driving element. A transistor arranged in the production path, a capacitor arranged to accumulate an operating voltage of the transistor, and a transistor arranged in parallel in the production path to accumulate the operating voltage in the capacitor. An electronic circuit is provided, comprising an additional transistor arranged in the circuit and switch means for controlling the programming path and the reproduction path.
[0012]
According to a second aspect of the present invention, there is provided an electronic circuit for driving a pixel of an electroluminescence (EL) device, wherein the pixel has an electroluminescence element, and the circuit supplies the electroluminescence element. A transistor arranged to operate for controlling the current to be applied, a capacitive element arranged to accumulate an operating voltage of the transistor during a programming stage, and storing the operating voltage in the capacitive element. An additional transistor arranged in parallel with the transistor, first switch means for creating a current path through the transistor and the additional transistor during operation during the programming stage, and during operation during the reproduction stage, The transistor and the electroluminescent element Electronic circuits to having a second switch means for producing a current path through is provided.
[0013]
According to a third aspect of the present invention, there is provided an electronic 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 arranged to operate for control of the transistor, a capacitive element arranged to accumulate an operating voltage of the transistor during a programming stage, and a transistor arranged to accumulate the operating voltage in the capacitive element. An additional transistor connected in parallel, first switch means for creating a current path through the transistor and the additional transistor during operation during the programming stage; and Pass through the electroluminescent element Second switching means for providing a current path, and a current sink, wherein the first switching means connects the current path during the programming stage to the current sink via the transistor and the additional transistor. An electronic circuit is provided that is arranged to communicate.
[0014]
According to a fourth aspect of the present invention, a current driver, a data line that outputs a current as a data signal, a capacitor that accumulates a charge based on the current output via the data line, An electronic circuit comprising: a plurality of transistors each having a gate connected to an element and arranged in parallel with each other; and a driving transistor arranged in series with the current driving element, wherein the plurality of transistors are connected to the data line. Supplying a current corresponding to the amount of charge accumulated in the capacitive element to the current driving element via the driving transistor based on the amount of current flowing in a current path including the plurality of transistors in a state where the current driving element is connected to the current driving element. An electronic circuit is provided.
[0015]
According to a fifth aspect of the present invention, there is provided an electronic circuit for driving a pixel of an electroluminescence device, wherein the pixel has an electroluminescence element, wherein the circuit includes a current driving element and a current signal as a data signal. , A capacitance element that accumulates charges based on a current output through the data line, a plurality of transistors each having a gate connected to the capacitance element, and a current driver. And a current corresponding to the amount of charge stored in the capacitive element based on the amount of current flowing through a current path including the plurality of transistors in a state where the plurality of transistors are connected to the data line. Is supplied to the current driving element via the driving transistor (T4), and the current passing through the plurality of transistors is supplied to the current driving element. An electronic circuit having switching means for generating a programming path, and a current sink, wherein the switching means is arranged to communicate with the current sink via the plurality of transistors in the programming path. Provided.
[0016]
According to a sixth aspect of the present invention, a current driver, a data line that outputs a current as a data signal, a capacitor that accumulates charges based on the current output via the data line, An electronic circuit comprising a plurality of transistors each having a gate connected to an element and arranged in parallel with each other, and a driving transistor arranged in series with the current driving element, wherein the plurality of transistors are connected to the data line. A current corresponding to the amount of electric charge accumulated in the capacitance element based on the amount of current flowing in a current path including the plurality of transistors in the connected state, via at least one of the plurality of transistors, the current driving element An electronic circuit is provided for supplying the electronic circuit.
[0017]
According to a seventh aspect of the present invention, there is provided an electronic circuit for driving a pixel of an electroluminescence device, wherein the pixel has an electroluminescence element, the circuit includes a current driving element, and a current signal as a data signal. A data line that outputs a current, a capacitance element that accumulates charges based on a current output through the data line during a programming stage, and a plurality of transistors each having a gate connected to the capacitance element. A current corresponding to the amount of charge accumulated in the capacitive element based on the amount of current flowing through a current path including the plurality of transistors in a state where the transistor is connected to the data line, and driving the current through the driving transistor. An element that operates through the plurality of transistors during operation during the programming stage. First switch means for generating a path, and second switch means for generating a current path passing through at least one of the plurality of transistors and the electroluminescent element during operation during the reproduction stage. An electronic circuit is provided.
[0018]
According to an eighth aspect of the present invention, there is provided an electroluminescent display device including one or more electronic circuits.
[0019]
According to a ninth aspect of the present invention, there is provided an electronic apparatus using the above-described electroluminescent display device.
[0020]
According to a tenth aspect of the present invention, there is provided a method of controlling a current supply to an electroluminescent device, the method comprising: providing a programming path including a plurality of sub-current paths; Providing a route.
[0021]
According to an eleventh aspect of the present invention, there is provided a method of controlling current supply to an electroluminescent device, the method comprising: providing a programming path including a plurality of sub-current paths connected to a current sink; Providing a re-production path through the luminescent element.
[0022]
According to the present invention, since the data current can be increased, the speed of the programming operation can be significantly increased.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be further described by way of example with reference to the accompanying drawings. These are only examples. In the present embodiment, as for the configuration, operation, and effect of the circuit shown in FIG. 2 described above, common parts are as already described, and therefore, different parts will be mainly described.
[0024]
As shown in FIG. 3, the circuit of the present embodiment includes an additional transistor T5 and an additional switching transistor T6 in addition to the circuit shown in FIG. T5 and T6 are P-type transistors.
[0025]
The source of the additional switching transistor T6 is connected to the storage capacitor C1, and the drain is connected to the source of the P-type transistor T1. The gates of this additional switching transistors T6 and T1 and the P-type transistor T3 are connected to each other. A programming voltage Vp is applied to the gates of T1, T3 and T6. T1 is connected to C1 via the drain-source of T6.
[0026]
The source of the additional transistor T5 is connected to VDD, and its gate is connected to the storage capacitor C1, so that the same drive voltage signal as the gate of the transistor T2 is applied. The drain of T5 is connected to a common connection point of the transistors T1, T3, and T6. That is, the storage capacitance element (storage capacitor) C1 is also connected between the gate and the source of the additional transistor T5.
[0027]
In the circuit of FIG. 3, the programming voltage Vp is applied to the gates of the transistors T1, T3, and T6. The P-type transistor T4, which is turned off during the programming stage, connects the drain of the P-type transistor T2 and the source of T3 to an organic electroluminescent device (OELD). During the programming stage, transistor T1 connects transistors T2, T5 to a current sink connected to ground or a reference voltage.
[0028]
The circuit of FIG. 3 operates during the programming stage with T4 off and T1, T3 and T6 on. T3 and T6 in the ON state have an effect of operating T2 and T5 as diodes. T1 also connects these diodes T2 and T5 to the data current sink. As a result, the capacitive element C1 stores electricity (accumulates charges) (or discharges depending on the voltage accumulated during the previous stage). The capacitance element C1 stores the electric charge according to the gate-source voltages of the transistors T2 and T5, and as a result, a voltage (VGS2, data current IDAT2) that controls the current supply to the organic electroluminescence element during the re-production stage. Accumulate). Here, the data current IDAT is a data signal output from the data line. At the end of the programming stage, T1, T3 and T6 are off. The voltage VGS2 is stored on C1 for the remainder of this frame, the re-production stage.
[0029]
More specifically, the circuit of FIG. 3 during the programming stage operates like the circuit shown in FIG. That is, in FIG. 4, a programming path including two sub-current paths including two transistors T2 and T5 operating as diodes is generated.
[0030]
The reproduction voltage VR is applied to the gate of the transistor T4. At the start of the reproduction stage in the circuit of FIG. 3, T4 is on and T1, T3 and T6 remain off. As a result, a reproduction path as shown in FIG. 5 is generated, and T2 operates as a current source by VGS2 biased by C1, and supplies a current to the organic electroluminescence element. At the end of the re-production stage, T4 is turned off and T1, T3 and T6 remain off. This completes one cycle. This drive waveform is shown in FIG.
[0031]
As described above, during the programming stage, as shown in FIG. 4, two auxiliary current paths including two transistors T2 or T5 operating as diodes are generated. Therefore, for example, if the ratio of the current supply capabilities of T2 and T5 is set to 1: 9, as shown in FIG. 6, the current IOEL supplied to the electroluminescent element in the production stage is the same 100 [nA]. In the present embodiment, the data current IDAT can be increased to 1 [μA], which is ten times that of the circuit shown in FIG. 2 in which the data current IDAT is 100 [nA]. As a result, as shown in FIG. 6, the period (programming time) of the programming stage for flowing the data current IDAT can be extremely shortened to 40 [μS] with respect to 100 [μS] of the circuit shown in FIG. For this reason, the speed of the programming operation can be significantly increased. The comparison shown in FIG. 6 is merely an example.
[0032]
FIG. 7 shows an example of mounting the drive circuit of FIG. 3 in the organic electroluminescence element device. In the circuit of FIG. 7, a large number of circuit blocks 10 are connected to a common current sink.
[0033]
8 and 9 show circuit examples as other embodiments. In the circuit of FIG. 8, during the programming stage, the transistors T1 and T6 are turned on, and two sub-current paths including two transistors T2 or T5 operating as diodes are generated. At the start of the reproduction stage, T4 is on and T1 and T6 remain off. As a result, as shown in FIG. 8, T4 operates as a current source by VGS2 biased by C1, and supplies current to the organic electroluminescent element. At the end of the reproduction stage, T4 is turned off and T1 and T6 remain off. This completes one cycle. This drive waveform is shown in FIG. In the embodiment of FIG. 8, as in the circuit of FIG. 3, the data current IDAT can be increased, and the programming operation can be performed at a significantly higher speed. Here, for example, if T2, T4, and T5 are composed of transistors having the same characteristics, the characteristics of each transistor can be easily matched, and a state of IDAT: IOEL = 2: 1 can be realized.
[0034]
In the circuit of FIG. 9, during the programming stage, the transistors T1, T3, and T6 are turned on, and two sub-current paths including two transistors T2 or T5 each operating as a diode are generated. Then, at the start of the reproduction stage, T4 is on and T1, T3, and T6 remain off. As a result, as shown in FIG. 9, T4 operates as a current source by VGS2 biased by C1, and supplies current to the organic electroluminescent element. At the end of the re-production stage, T4 is turned off and T1, T3 and T6 remain off. This completes one cycle. This drive waveform is shown in FIG. Also in the embodiment of FIG. 9, similarly to the circuit of FIG. 3, the data current IDAT can be increased, and the programming operation can be greatly speeded up. Here, for example, if T2 and T5 are composed of transistors having the same characteristics, the characteristics of each transistor can be easily matched, and a state of IDAT: IOEL = 2: 1 can be realized.
[0035]
FIG. 10 is a schematic cross-sectional view of a certain organic electroluminescence element device. In FIG. 10, reference numeral 132 indicates a hole transport layer, reference numeral 133 indicates an organic electroluminescent layer, and reference numeral 151 indicates a resistor or a separator formed of an insulating film or the like. The switching thin film transistor 121 and the p-channel type current thin film transistor 122 have a top-gate structure and a maximum temperature of 600 degrees Celsius, for example, as used in a known thin film transistor liquid crystal display device. A structure and a method usually used for a low temperature polysilicon thin film transistor, such as a manufacturing method at a lower temperature, are employed. However, other structures and methods can be used.
[0036]
The organic electroluminescent display element 131 includes a cathode 116 made of aluminum or the like, an anode 115 made of ITO, a hole transport layer 132, and an organic electroluminescent layer 133.
[0037]
The hole transport layer 132 and the organic electroluminescence layer can be formed by an inkjet method, a mask evaporation method, or the like while using the resistor 151 as a separation structure between pixels. The opposed anode 115 made of ITO can be formed by sputtering. However, other methods can be used to form all of these components. For example, an electron transport layer can be provided between the light emitting layer and the cathode.
[0038]
FIG. 11 schematically shows a typical layout of the entire display panel using the present invention. The panel includes an active matrix organic electroluminescent device 200 with analog current programmed pixels, an integrated thin film transistor scan driver 210 with a level shifter, a flexible TAB tape 220, and an integrated RAM / controller. And an external analog driver LSI 230. Of course, this is only an example of a panel configuration that can be realized using the present invention.
[0039]
The structure of the organic electroluminescent display device is not limited to the above. Other structures are also applicable.
[0040]
The circuits shown in FIGS. 3 through 11 are preferably implemented using thin film transistor (thin film transistor) technology, and are most preferably polysilicon thin film transistors.
[0041]
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.
[0042]
Some electronic devices using the above-described organic electroluminescent display device will be described below.
[0043]
<1: Mobile computer>
Next, an example of a mobile personal computer to which the display device according to one of the above embodiments is applied will be described.
[0044]
FIG. 12 is an isometric view showing the configuration of the 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.
[0045]
<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. 13 is an isometric view showing the configuration of the mobile phone. In the figure, a 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.
[0046]
<3: Digital still camera>
Next, a digital still camera using the organic electroluminescence display device as a finder will be described. FIG. 14 is an isometric view showing an outline of the configuration of the digital still camera and connection to an external device.
[0047]
An ordinary camera exposes an optical image of a subject to a film, while the digital still camera 1300 generates an image signal from the optical image of the subject by, for example, photoelectric conversion using 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 a rear surface of a case 1302. Therefore, the display panel 100 functions as a finder for displaying a subject. A light receiving unit (photo acceptance unit) 1304 having an optical lens and a CCD is provided on the front surface (rear side in the figure) of the case 1302.
[0048]
When the photographer determines the subject image displayed on the organic electroluminescence element panel 100 and opens the shutter, an image signal from the CCD is transmitted and stored in a 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 a 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.
[0049]
Examples of electronic devices other than the personal computer shown in FIG. 12, the mobile phone shown in FIG. 13, and the digital still camera shown in FIG. 14 include an organic electroluminescence element TV set, a viewfinder type and a monitoring type video tape recorder, and a car. Examples include a navigation system, a pager, an electronic notebook, a calculator, a word processor, a workstation, a TV phone, a POS system terminal, and a device with a touch panel. Of course, the above-mentioned organic electroluminescence device is applicable to the display portion of these electronic devices.
[0050]
The driving circuit of the present invention can be arranged not only in the pixel of the display unit but also outside the display unit.
[0051]
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 also include, for example, a magnetoresistive RAM, a capacitance sensor, a charge sensor, a DNA sensor, a night vision camera, and many other devices. It is.
[0052]
FIG. 15 shows an 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.
[0053]
FIG. 16 shows an application of the drive circuit of the present invention to a magnetoresistive element. In FIG. 14, the magnetic head is denoted by reference numeral MH, and the magnetic register is denoted by reference numeral MR.
[0054]
FIG. 17 shows an application of the drive circuit of the present invention to a capacitance sensor or a charge sensor. In FIG. 17, a sense capacitance element (sense capacitor) is indicated by reference symbol Csense. The circuit in FIG. 17 can be applied to other uses such as a fingerprint sensor and DNA.
[0055]
FIG. 18 shows an application of the drive circuit of the present invention to a night vision camera. In FIG. 18, the photoconductor is indicated by the symbol R.
[0056]
In the embodiments shown in the above-identified description, each transistor has been shown as a p-channel transistor. This is not a limiting element of the present invention. For example, an n-channel transistor may be used instead of a p-channel transistor.
[0057]
It will be apparent to those skilled in the art that various modifications and improvements can be made to the configurations described with respect to FIGS. 3 through 18 without departing from the scope of the invention.
[Brief description of the drawings]
FIG. 1 shows a conventional organic electroluminescence element pixel drive circuit using two transistors.
FIG. 2 shows a current-programmed organic electroluminescence element driving circuit invented earlier.
FIG. 3 shows a pixel driving circuit according to the first embodiment of the present invention.
FIG. 4 illustrates an equivalent circuit during a programming stage of a pixel driving circuit according to an embodiment of the present invention.
FIG. 5 shows an equivalent circuit in a reproduction stage of the pixel driving circuit according to one embodiment of the present invention.
FIG. 6 is a table comparing the pixel driving circuit of FIG. 2 with the pixel driving circuit of one embodiment according to the present invention with respect to the value of the data current and the operation speed of the programming stage.
FIG. 7 is a circuit diagram of an example in which an organic electroluminescence element and a pixel driving circuit according to an embodiment of the present invention are applied to a display.
FIG. 8 shows another embodiment of the pixel driving circuit according to the present invention.
FIG. 9 shows another embodiment of the pixel drive circuit according to the present invention.
FIG. 10 is a schematic sectional view illustrating a mounted state of a pixel drive circuit in the organic electroluminescence element device according to the present invention.
FIG. 11 is a schematic plan view of an organic electroluminescent display panel according to the present invention.
FIG. 12 is a schematic diagram of a mobile personal computer using a display device having a pixel drive circuit of the present invention.
FIG. 13 is a schematic diagram of a mobile phone using a display device having a pixel drive circuit of the present invention.
FIG. 14 is a schematic diagram of a digital camera using a display device having a pixel driving circuit of the present invention.
FIG. 15 shows an application of the drive circuit of the present invention to a magnetic RAM.
FIG. 16 shows an application of the drive circuit of the present invention to a magnetoresistive element.
FIG. 17 shows an application of the drive circuit of the present invention to a capacitance sensor or a charge sensor.
FIG. 18 shows an application of the drive circuit of the present invention to a night vision camera.

Claims (34)

An electronic circuit having a programming path and a reproduction path,
The circuit comprises:
A current driving element;
A transistor in the production path arranged to operate for controlling a current supplied to the current driving element;
A capacitive element arranged to store an operating voltage of the transistor;
An additional transistor disposed in parallel with the transistor in the production path to store the operating voltage in the capacitive element;
An electronic circuit comprising switch means for controlling the programming path and the reproduction path. An electronic circuit for driving pixels of an EL (electroluminescence) device,
The pixel has an electroluminescent element,
The circuit comprises:
A transistor arranged to operate for controlling a current supplied to the electroluminescent element,
During the programming stage, a capacitive element arranged to store the operating voltage of said transistor;
An additional transistor arranged in parallel with the transistor to store the operating voltage in the capacitive element;
First switch means for creating a current path through the transistor and the additional transistor during operation during the programming stage;
An electronic circuit comprising: a second switch for generating a current path passing through the transistor and the electroluminescent element during operation during a reproduction stage. An electronic circuit for driving a pixel of an electroluminescence device,
The pixel has an electroluminescent element,
The circuit comprises:
A transistor arranged to operate for controlling a current supplied to the electroluminescent element,
During the programming stage, a capacitive element arranged to store the operating voltage of said transistor;
An additional transistor connected in parallel to the transistor to store the operating voltage in the capacitive element;
First switch means for creating a current path through the transistor and the additional transistor during operation during the programming stage;
Second switch means for creating a current path through the transistor and the electroluminescent element during operation during the reproduction stage;
A current sink;
The electronic circuit according to claim 1, wherein said first switch means is arranged such that said current path during said programming stage leads to said current sink via said transistor and said additional transistor. 4. The electronic circuit according to claim 2, wherein said first and second switch means are controlled by control signals independent of each other. 5. The electronic circuit according to claim 2, further comprising third switching means arranged such that the transistor is diode-connected in an on state during the programming stage. circuit. 6. The electronic circuit according to claim 5, wherein the third switch connects the first switch to a source-drain current path of the transistor. 7. The electronic circuit according to claim 2, further comprising, during the programming stage, additional switching means arranged such that the additional transistor is diode-connected in an on state. circuit. 8. The electronic circuit according to claim 7, wherein said additional switch means is arranged between said capacitive element and said first switch means. 9. The electronic circuit according to claim 7, wherein said additional switch means connects said first switch means to said transistor and a gate of said additional transistor. 10. The electronic circuit according to claim 5, wherein the third switch connects the drains of both the transistor and the additional transistor, and the gate of the additional transistor is connected to the gate of the transistor. An electronic circuit characterized by: 10. The electronic circuit according to claim 9, comprising a plurality of said additional transistors each having said additional switch means, each said additional transistor and said additional switch means being arranged as aforesaid, and An electronic circuit, wherein the switch means are arranged in series with each other. A current driver, a data line that outputs a current as a data signal, a capacitor that accumulates charges based on the current output through the data line, and a gate connected to the capacitor and connected in parallel with each other. An electronic circuit comprising: a plurality of arranged transistors; and a driving transistor arranged in series with the current driving element,
A current corresponding to the amount of charge accumulated in the capacitive element based on the amount of current flowing through a current path including the plurality of transistors in a state where the plurality of transistors is connected to the data line, via the driving transistor. An electronic circuit, which is supplied to a current driving element. An electronic circuit for driving a pixel of an electroluminescence device,
The pixel has an electroluminescent element,
The circuit comprises:
A current driver, a data line that outputs a current as a data signal, a capacitor that accumulates charges based on the current output through the data line, and a plurality of transistors whose gates are connected to the capacitor. , Comprising a driving transistor arranged in series with the current driving element,
When the plurality of transistors are connected to the data line, a current corresponding to the amount of charge stored in the capacitive element is supplied to the drive transistor (T4) based on the amount of current flowing through a current path including the plurality of transistors. Supply to the current driving element through
Switch means for creating a programming path through the plurality of transistors;
A current sink;
The electronic circuit according to claim 1, wherein said switch means is arranged to communicate with said current sink via said plurality of transistors in said programming path. 14. The electronic circuit according to claim 12 or 13, further comprising additional switch means arranged to diode-connect the plurality of transistors in the programming path in an on state. 15. The electronic circuit according to claim 14, wherein said additional switch means is arranged between said capacitive element and said first switch means. 16. The electronic circuit according to claim 14, wherein the additional switching means connects the switching means to gates of the plurality of transistors. 17. The electronic circuit according to claim 14, wherein gates of the plurality of transistors (T2, T5) are connected to each other. A current driver, a data line that outputs a current as a data signal, a capacitor that accumulates charges based on the current output through the data line, and a gate connected to the capacitor and connected in parallel with each other. An electronic circuit comprising a plurality of transistors arranged and a driving transistor arranged in series with the current driving element,
At least one of the plurality of transistors outputs a current corresponding to a charge amount stored in the capacitor based on a current amount flowing through a current path including the plurality of transistors in a state where the plurality of transistors are connected to the data line. An electronic circuit, wherein the current is supplied to the current driving element via one of the electronic circuits. An electronic circuit for driving a pixel of an electroluminescence device,
The pixel has an electroluminescent element,
The circuit comprises:
A current driver, a data line that outputs a current as a data signal, a capacitor that accumulates charges based on the current output through the data line during a programming stage, and a gate connected to the capacitor. Comprising a plurality of transistors,
A current corresponding to the amount of charge accumulated in the capacitive element based on the amount of current flowing through a current path including the plurality of transistors in a state where the plurality of transistors is connected to the data line, via the driving transistor. Supply to the current drive element,
First switch means for creating a current path through the plurality of transistors during operation during the programming stage;
Second switch means for generating a current path passing through at least one of the plurality of transistors and the electroluminescent element during operation during a reproduction stage;
An electronic circuit, comprising: 20. The electronic circuit according to claim 19, wherein said first and second switch means are controlled by control signals independent of each other. 21. The electronic circuit according to claim 19, further comprising third switch means arranged to diode-connect the plurality of transistors in an on state during the programming stage. 22. The electronic circuit according to claim 21, wherein the third switching means connects at least one of the plurality of transistors to an electroluminescent element during the programming stage. 22. The electronic circuit according to any one of claims 19 to 21, further comprising additional switch means arranged to diode-connect the plurality of transistors in an on state during the programming stage. 24. The electronic circuit according to claim 23, wherein said additional switch means is disposed between said capacitance element and said electroluminescence element. 24. The electronic circuit according to claim 21, wherein the third switch connects both drains of the plurality of transistors, and connects both the drains to an electroluminescence element. An electronic circuit, wherein the gates of the transistors are connected to each other. The electronic circuit according to claim 1, wherein the transistor is a p-channel thin film transistor. 26. The electronic circuit according to claim 12, wherein at least one of the plurality of transistors is a p-channel thin film transistor. 22. The electronic circuit according to claim 5, wherein each of the first, second, and third switch means is a p-channel thin film transistor. 15. The electronic circuit according to claim 14, wherein said switch means and said additional switch means are each a p-channel thin film transistor. An electroluminescent display device comprising one or more electronic circuits according to any one of claims 1 to 25. An electronic device using the electroluminescent display device according to claim 30. A method for controlling current supply to an electroluminescent element,
Providing a programming path including a plurality of sub-current paths;
Providing a re-production path through the electroluminescent device. A method for controlling current supply to an electroluminescent element,
Providing a programming path including a plurality of sub-current paths connected to the current sink;
Providing a re-production path through the electroluminescent device. A current driving element;
A method of driving a circuit including a transistor that controls current supply to the current driving element,
Determining a gate voltage of the transistor based on a predetermined current, wherein the predetermined current is greater than the current supplied to the current driver.

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