JP2007052440A - Electronic device and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for driving an electronic circuit, an electronic device, and an electro-optical device, which can improve a motion video characteristic by suppressing a pseudo contour, a deviation of an image, or the like when displaying a motion video. <P>SOLUTION: When one frame period is started by a vertical scanning start signal, a plurality of scanning lines Y1 to Yn is sequentially selected, and setting operation to perform setting according to a data signal every time one of the scanning lines Y1 to Yn is selected, and reset operation to halt light emission of an organic EL element are repeated alternately. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for driving an electronic device such as an electro-optical device and an electronic apparatus.

  In recent years, an electro-optical device using an organic EL element as an electro-optical device has attracted attention as being superior to other devices in terms of low power consumption, a high viewing angle, and a high contrast ratio. In an electro-optical device using this type of organic EL element, the amount of current supplied to the organic EL element is controlled by applying a voltage according to a data signal (data current) to the gate terminal to control the conduction state of the transistor. There is a method of controlling the luminance gradation by setting (see, for example, Patent Document 1).

Pamphlet of International Publication No. WO98 / 3640

  In the electro-optical device of the above method, when a pixel is selected by a scanning signal and a moving image is displayed using the entire period until the next selection as a display period or a light emission period, pseudo contour, image shift, etc. Problems may occur.

  The present invention has been made paying attention to such conventional problems, and its purpose is to improve moving image characteristics by suppressing pseudo contours, image shifts, etc. when displaying moving images. An electronic circuit driving method, an electronic device driving method, an electro-optical device driving method, and an electronic apparatus are provided.

  The electronic device driving method according to the present invention includes a plurality of first signal lines, a plurality of second signal lines, and an intersection of the plurality of first signal lines and the plurality of second signal lines. An electronic device driving method comprising: a plurality of unit circuits arranged correspondingly; and a first first signal of the plurality of first signal lines out of the plurality of unit circuits. A first step of performing a set operation on a first group of unit circuits connected to the line; and a second first signal of the plurality of first signal lines out of the plurality of unit circuits. A second step of performing a reset operation on a second group of unit circuits connected to the line; and a third first signal of the plurality of first signal lines out of the plurality of unit circuits. A third step of performing a set operation on a third group of unit circuits connected to the line, and among the plurality of unit circuits, And a fourth step of performing a reset operation on a fourth group of unit circuits connected to the fourth first signal line among the plurality of first signal lines, and the first step One signal line and the third first signal line are adjacent to each other, and the second first signal line and the fourth first signal line are adjacent to each other.

  In the driving method of the electronic device, each of the plurality of first signal lines may be connected within one frame period in which a data signal is supplied to all of the plurality of unit circuits via the plurality of second signal lines. It is preferred to select at least twice.

In the driving method of the electronic device, a set operation or a reset operation is performed on any unit circuit of the plurality of unit circuits from the end of the first step to the execution of the second step. First, after the end of the second step, the set operation or the reset operation is not performed for any of the plurality of unit circuits until the third step is performed. It is preferable that the set operation or the reset operation is not performed for any of the plurality of unit circuits until the fourth step is performed.
Another electronic device driving method according to the present invention includes a plurality of first signal lines, a plurality of second signal lines, an intersection of the plurality of first signal lines and the plurality of second signal lines. An electronic device driving method comprising: a plurality of unit circuits arranged corresponding to a unit; and a first first of the plurality of first signal lines out of the plurality of unit circuits. A first step of performing a set operation on a first group of unit circuits connected to a plurality of signal lines; and a second first of the plurality of first signal lines among the plurality of unit circuits. A second step of performing a reset operation on the second group of unit circuits connected to the signal lines; and a third first of the plurality of first signal lines among the plurality of unit circuits. A third step of performing a set operation on the third group of unit circuits connected to the signal lines of the plurality of unit circuits; A fourth step of performing a reset operation on a fourth group of unit circuits connected to a fourth first signal line of the plurality of first signal lines; and the first group of unit circuits. A fifth step of performing a reset operation on the second group, a sixth step of performing a set operation on the second group of unit circuits, and a seventh step of performing a reset operation on the third group of unit circuits. And an eighth step of performing a set operation on the unit circuits of the fourth group, wherein the first first signal line and the third first signal line are adjacent to each other, The second first signal line and the fourth first signal line are adjacent to each other.

  In the driving method of the electronic device, a set operation or a reset operation is performed on any unit circuit of the plurality of unit circuits from the end of the first step to the execution of the second step. First, after the end of the second step, the set operation or the reset operation is not performed for any of the plurality of unit circuits until the third step is performed. It is preferable that the set operation or the reset operation is not performed for any of the plurality of unit circuits until the fourth step is performed.

  In the driving method of the electronic device, the first step and the fifth step are performed within one frame period in which a data signal is supplied to all of the plurality of unit circuits via the plurality of second signal lines. May be performed.

  In the electronic device driving method, each of the plurality of unit circuits includes a first transistor, and is supplied through one second signal line of the plurality of second signal lines by the set operation. The conduction state of the first transistor may be set in accordance with the data signal to be performed.

In the driving method of the electronic device, the conduction state of the first transistor set by the set operation may be reduced by the reset operation.
In the electronic device driving method, the first transistor may be turned off by the reset operation.

  In the driving method of the electronic device, each of the plurality of unit circuits may include an electronic element, and the electronic element may be stopped by the reset operation.

  In the driving method of the electronic device, each of the plurality of unit circuits includes a driving transistor and a first switching transistor, and the driving transistor is connected to the plurality of second signal lines by the set operation. One of the second signal lines and the data signal supplied via the first switching transistor is set in a conductive state, and the reset operation causes the first switching transistor to be in an off state, thereby driving the driving transistor. May be turned off.

  In the driving method of the electronic device, each of the plurality of unit circuits includes a driving transistor, a first switching transistor, and a second switching transistor, and the setting operation causes the second switching transistor to be in an off state. The driving transistor is set to a conductive state according to a data signal supplied through one second signal line of the plurality of second signal lines and the first switching transistor, and the reset operation is performed. The second switching transistor may be turned on, the first switching transistor may be turned off, and the driving transistor may be turned off.

  In the driving method of the electronic device, the second switching transistor may control electrical connection between a gate and a source or drain of the driving transistor.

  In the driving method of the electronic device, the plurality of first signal lines are a plurality of scanning lines, the plurality of second signal lines are a plurality of data lines, and each of the plurality of unit circuits is an electric circuit. An optical element may be included.

In the driving method of the electronic device, the electro-optical element may be a light emitting element.
The electronic device according to the present invention is driven by the above-described driving method of the electronic device.

  An electronic circuit driving method according to the present invention includes a first transistor having a first terminal and a second terminal, a capacitive element connected to a first control terminal of the first transistor, and the first transistor. A second transistor having a third terminal and a fourth terminal, and a third transistor having a fifth terminal and a sixth terminal, which control electrical connection between the first terminal and the capacitor. A method of driving an electronic circuit comprising: a transistor; and turning on the second transistor and the third transistor, and supplying a signal through the sixth terminal and the fifth terminal, A first step of accumulating electric charge according to the signal in the capacitor and setting a conduction state of the first transistor according to the signal, and turning off the third transistor and the second transistor, respectively. State and on state Characterized in that it comprises a second step of changing the conductive state of the first of said first transistor which is set in step by Rukoto, the.

  According to this, in the first step, the second and third transistors are turned on, charges corresponding to the signal are accumulated in the capacitive element, and the conduction state of the first transistor is set according to the signal. After that, in the second step, the conduction state of the first transistor set in the first step can be changed by turning the third and second transistors off and on, respectively. As a result, in a state where the conduction state of the first transistor set according to the signal in the first step is changed in the second step, a signal, for example, a data current is supplied to the capacitor element in the next first step. It is possible to write a charge corresponding to. For this reason, even when the data current is small, the time required to write the data current can be shortened. As a result, it is possible to suppress the influence due to the wiring capacity of the data lines and the like, and when moving images are displayed, the occurrence of pseudo contours, image shifts, and the like are suppressed, and moving image characteristics can be improved. Here, the “pseudo contour” refers to a shift in gradation display color caused by the movement of the line of sight following the display image.

  In addition, in order to change the conduction state of the first transistor, it is not necessary to provide a transistor or a circuit, and it is only necessary to control on / off of the third transistor and the second transistor. Therefore, without writing a transistor or a circuit, even when data corresponding to a low luminance gradation is written, the data writing time can be shortened and the operation delay can be reduced.

  In this electronic circuit driving method, in the second step, the first transistor is turned off.

  According to this, the 1st transistor by which the conduction | electrical_connection state was set according to the signal at the 1st step can be made into an OFF state by the 2nd step before the following 1st step execution. As a result, the first transistor is turned off before the next first step is executed, and in the next first step, a signal, for example, a charge corresponding to the data current is written into the capacitor. For this reason, even when the data current is small, the data writing time can be further shortened, the operation delay can be further reduced, and the moving image characteristics can be further improved.

  In this electronic circuit driving method, the second terminal of the first transistor is electrically connected to a predetermined potential, and is applied to the first control terminal in the second step. The potential is different from the predetermined potential.

  According to this, in the second step, a potential different from the predetermined potential is applied to the first control terminal to change the conduction state of the first transistor or to turn off the first transistor. it can.

  In this electronic circuit driving method, in the second step, the potential applied to the first control terminal is the potential obtained by subtracting the threshold voltage of the first transistor from the predetermined potential, or the predetermined And the threshold voltage of the first transistor are added to each other.

  According to this, in the second step, the potential obtained by subtracting the threshold voltage of the first transistor from the predetermined potential or the potential obtained by adding the predetermined potential and the threshold voltage of the first transistor is used for the first control. Apply to terminal. Accordingly, the conduction state of the first transistor can be changed or the first transistor can be turned off.

  In this electronic circuit driving method, an electronic element is connected to the first transistor.

  According to this, in the second step, the operation state of the electronic element is changed or the operation is reset (terminated) by changing the conduction state of the first transistor or turning off the first transistor. Can do.

  In this electronic circuit driving method, in the second step, the first transistor is turned off by a potential applied to the first control terminal of the first transistor to operate the electronic element. Reset.

  According to this, in the second step, the operation of the electronic element can be reset by turning off the first transistor with the potential applied to the first control terminal.

  Another electronic device driving method according to the present invention includes a plurality of first signal lines, a plurality of second signal lines, a plurality of third signal lines, a power supply line, and a plurality of unit circuits. Each of the plurality of unit circuits includes a first transistor having a first terminal and a second terminal, and a first control terminal of the first transistor. A connected capacitive element; a second transistor having a third terminal and a fourth terminal for controlling electrical connection between the first terminal and the capacitive element; a fifth terminal; A third transistor having six terminals, wherein a second control terminal of the second transistor is connected to one of the plurality of second signal lines, and the third transistor has a second control terminal. 3 control terminal and the sixth terminal are one of the plurality of first signal lines and the sixth terminal, respectively. Connected to one of the third signal lines and supplied through one of the third signal lines while both the second transistor and the third transistor are on. A first step of storing a signal to be stored in the capacitor as a charge and setting a conduction state of the first transistor according to the signal, and turning off and turning on the third transistor and the second transistor, respectively. As a state, a second step of supplying a charge amount to the capacitor element so as to reduce the conduction state of the first transistor set in the first step is provided.

  According to this, in the second step, the capacitive element is changed in the next first step in a state where the conduction state of the first transistor set according to the signal in the first step is changed to be reduced. A signal, for example, a charge corresponding to a data current can be written to the signal. For this reason, even when the data current is small, the time required to write the data current can be shortened. As a result, it is possible to suppress the influence due to the wiring capacity of the data lines and the like, and when moving images are displayed, the occurrence of pseudo contours, image shifts, and the like are suppressed, and moving image characteristics can be improved. In addition, in order to change the conduction state of the first transistor, it is not necessary to provide a transistor or a circuit, and it is only necessary to control on / off of the third transistor and the second transistor.

  In the driving method of the electronic device, in the second step, the first transistor is turned off.

  According to this, the 1st transistor by which the conduction | electrical_connection state was set according to the signal at the 1st step can be made into an OFF state by the 2nd step before the following 1st step execution. As a result, the first transistor is turned off before the next first step is executed, and in the next first step, a signal, for example, a charge corresponding to the data current is written into the capacitor. For this reason, even when the data current is small, the data writing time can be further shortened, the operation delay can be further reduced, and the moving image characteristics can be further improved.

  In the driving method of the electronic device, the second terminal of the first transistor is electrically connected to a predetermined potential, and is applied to the first control terminal in the second step. The potential is different from the predetermined potential.

  According to this, in the second step, a potential different from the predetermined potential is applied to the first control terminal to change the conduction state of the first transistor or to turn off the first transistor. Can be made.

  In the driving method of the electronic device, in the second step, the potential applied to the first control terminal is a potential obtained by subtracting a threshold voltage of the first transistor from the predetermined potential, or the predetermined And the threshold voltage of the first transistor are added to each other.

  According to this, in the second step, the potential obtained by subtracting the threshold voltage of the first transistor from the predetermined potential or the potential obtained by adding the predetermined potential and the threshold voltage of the first transistor is used for the first control. Apply to terminal. Thereby, the conduction state of the first transistor can be changed to be reduced, or the first transistor can be turned off.

In the driving method of the electronic device, an electronic element is connected to the first transistor in which the electronic element is connected to the first transistor.
According to this, in the second step, the operation state of the electronic device is changed or reduced by changing the conduction state of the first transistor or turning off the first transistor. Can be reset.

  In the driving method of the electronic device, in the second step, the first transistor is turned off by a potential applied to the first control terminal of the first transistor, and the operation of the electronic element is performed. Reset.

  According to this, in the second step, the operation of the electronic element can be reset by turning off the first transistor with the potential applied to the first control terminal.

  The electro-optical device driving method according to the present invention includes n rows of scanning lines each having a first sub-scanning line and a second sub-scanning line, m columns of data lines, power supply lines, the scanning lines, and the scanning lines. And a plurality of unit circuits arranged in n rows and m columns corresponding to the intersections of the data lines, wherein each of the plurality of unit circuits includes a first terminal and a plurality of unit circuits. Controlling electrical connection between a first transistor having a second terminal, a capacitive element connected to a first control terminal of the first transistor, and the first terminal and the capacitive element A second transistor having a third terminal and a fourth terminal, a third transistor having a fifth terminal and a sixth terminal, and an electro-optic element connected to the first transistor And the second control terminal of the second transistor is connected to the n rows. A third control terminal of the third transistor is connected to the first sub-scan line of the n-row scan line; and The sixth terminal is connected to one of the m columns of data lines, and one of the m columns of data lines while both the second transistor and the third transistor are on. A first step of storing a data signal supplied through the capacitor as a charge in the capacitor, and setting a conduction state of the first transistor according to the data signal; and a third transistor and a second transistor And a second step of supplying a charge amount to the capacitor element so as to reduce the conduction state of the first transistor set in the first step, with the transistors turned off and on, respectively.

  According to this, in the second step, the capacitance is changed in the next first step in a state where the conduction state of the first transistor set in accordance with the data signal in the first step is reduced. A charge corresponding to a data signal, for example, a data current, can be written to the element. For this reason, even when the data current is small, the time required to write the data current can be shortened. As a result, it is possible to suppress the influence due to the wiring capacity of the data lines and the like, and when moving images are displayed, the occurrence of pseudo contours, image shifts, and the like are suppressed, and moving image characteristics can be improved. In addition, in order to change the conduction state of the first transistor, it is not necessary to provide a transistor or a circuit, and it is only necessary to control on / off of the third transistor and the second transistor.

  In the driving method of the electro-optical device, in the second step, the first transistor is turned off.

  According to this, the 1st transistor by which the conduction | electrical_connection state was set according to the signal at the 1st step can be made into an OFF state by the 2nd step before the following 1st step execution. As a result, the first transistor is turned off before the next first step is executed, and in the next first step, a signal, for example, a charge corresponding to the data current is written into the capacitor. For this reason, even when the data current is small, the data writing time can be further shortened, the operation delay can be further reduced, and the moving image characteristics can be further improved.

  In the driving method of the electro-optical device, the second terminal of the first transistor is electrically connected to a predetermined potential, and is applied to the first control terminal in the second step. Is different from the predetermined potential.

  According to this, in the second step, a potential different from the predetermined potential is applied to the first control terminal to change the conduction state of the first transistor or to turn off the first transistor. Can be made.

  In the driving method of the electro-optical device, in the second step, the potential applied to the first control terminal is a potential obtained by subtracting a threshold voltage of the first transistor from the predetermined potential, or A potential obtained by adding a predetermined potential and the threshold voltage of the first transistor is used.

  According to this, in the second step, the potential obtained by subtracting the threshold voltage of the first transistor from the predetermined potential or the potential obtained by adding the predetermined potential and the threshold voltage of the first transistor is used for the first control. Apply to terminal. Thereby, the conduction state of the first transistor can be changed to be reduced, or the first transistor can be turned off.

  In the driving method of the electro-optical device, in the second step, the first transistor is turned off by the potential applied to the first control terminal to stop the supply of current to the electro-optical element. Let

  According to this, in the second step, the operation of the electro-optic element can be stopped (reset) by turning off the first transistor with the potential applied to the first control terminal.

  In the driving method of the electro-optical device, the vertical scanning for selecting the n rows of scanning lines one by one in order in one frame period is performed at least twice, and in the first vertical scanning, the odd number of the n rows of scanning lines is an odd number. When selecting either one of the scanning lines of even rows or even rows, the conduction state of the first transistor of the unit circuit for one row connected to one selected scanning line among the plurality of unit circuits is selected as the data The second transistor of the unit circuit for one row connected to the selected one scanning line is turned on when either the odd row or the even row is selected. In this way, the first transistor is turned off, and in the second vertical scanning, one of the n scanning lines selected at the time of selection of the odd scanning line or the even scanning line is selected. The conduction state of the first transistor of the unit circuit for one row connected to the scanning line is set according to the data signal, and is selected when either the odd row or the even row is selected. The first transistor is turned off by turning on the second transistor of one row of unit circuits connected to one scanning line.

  According to this, by performing interlaced vertical scanning to form an image of one frame, a set period in which each scanning line is selected, the first transistor is turned on, and the electro-optic element is in an operating state. Is distributed without concentration, so that the load on the circuit is reduced. In addition, since the reset period for selecting each scanning line to turn off the first transistor and stopping the operation of the electro-optic element is distributed without being concentrated, the load on the circuit is reduced. Since the load on the circuit can be reduced in this way, a data signal having a larger current value can be supplied by the amount of the reduced load. Therefore, the operation delay due to the wiring capacity of the data line can be further reduced, and the set period can be further shortened. Therefore, data can be written at high speed, and even when the data current is small, the data write time can be further shortened to further reduce the operation delay, and the moving image characteristics can be further improved.

  In this method of driving the electro-optical device, in one frame period, the conduction state of the first transistor of the unit circuit for one row connected to one scanning line selected from the plurality of unit circuits is determined as the data signal. Each time a scanning line is selected, a set operation that is set in accordance with the first row transistor, and a reset operation that turns off the first transistor by turning on the second transistor of the unit circuit for one row. Alternately.

  According to this, by performing the interlaced scanning type vertical scanning as described above to form an image of one frame, each scanning line is selected, the conduction state of the first transistor is set, and the electro-optic element is Since the set periods for setting the operating state are distributed without being concentrated, the load on the circuit is reduced. In addition, since the reset period for selecting each scanning line to turn off the first transistor and stopping the operation of the electro-optic element is distributed without being concentrated, the load on the circuit is reduced. Since the load on the circuit can be reduced in this way, a data signal having a larger current value can be supplied by the amount of the reduced load. Therefore, the operation delay due to the wiring capacity of the data line can be further reduced, and the set period can be further shortened. Therefore, data can be written at high speed, and even when the data current is small, the data writing time can be further shortened to further reduce the operation delay, and the moving image characteristics can be further improved.

  In the driving method of the electro-optical device, the scanning line on which the set operation is performed and the scanning line on which the reset operation is performed are selected in order from the plurality of scanning lines.

  According to this, the operation period of the electro-optic element can be changed by appropriately selecting the scanning line on which the reset operation is performed first. Accordingly, it is possible to easily set the operation period of the electro-optic element that can obtain the optimum moving image characteristics.

  In the driving method of the electro-optical device, the electro-optical elements are three types of light-emitting elements that respectively emit red, green, and blue light, and the unit circuit connected to each of the n rows of scanning lines includes the three types of light-emitting elements. Among these light emitting elements, one kind of light emitting element that emits light of the same color is included.

  According to this, since each of the scanning lines is connected with a light emitting element that emits light of the same color among the three types of light emitting elements that emit light of red, green, and blue, light emission of the light emitting element for each scanning line. By changing the timing of stopping the light emission, the light emission period of the light emitting element can be appropriately changed for each color. Thereby, a change in color balance due to a secular change or the like can be easily adjusted.

  An electronic circuit driving method according to the present invention includes a first transistor having a first terminal and a second terminal, a second transistor having a third terminal and a fourth terminal, and the first transistor. A capacitor commonly connected to the first control terminal of the transistor and the second control terminal of the second transistor; the third terminal of the second transistor; and the second control terminal. A third transistor having a fifth terminal and a sixth terminal, and a fourth transistor having a seventh terminal and an eighth terminal, which control electrical connection with A method for driving a circuit, wherein the third transistor and the fourth transistor are turned on, a signal is supplied through the eighth terminal and the seventh terminal, and the capacitor is supplied with the signal according to the signal The second transistor and A first step of setting a conduction state of the first transistor according to the signal; and a step of turning off and turning on the fourth transistor and the third transistor, respectively. And a second step of changing the conductive state of the set second transistor and the first transistor.

  According to this, in the first step, the second and third transistors are turned on, charges corresponding to the signal are accumulated in the capacitive element, and the conduction state of the first transistor is set according to the signal. After that, in the second step, the conduction state of the first transistor set in the first step can be changed by turning the third and second transistors off and on, respectively. As a result, in a state where the conduction state of the first transistor set according to the signal in the first step is changed in the second step, a signal, for example, a data current is supplied to the capacitor element in the next first step. It is possible to write a charge corresponding to. For this reason, even when the data current is small, the time required to write the data current can be shortened. As a result, it is possible to suppress the influence due to the wiring capacity of the data lines and the like, and when moving images are displayed, the occurrence of pseudo contours, image shifts, and the like are suppressed, and moving image characteristics can be improved.

  In addition, in order to change the conduction state of the first transistor, it is not necessary to provide a transistor or a circuit, and it is only necessary to control on / off of the third transistor and the second transistor. Therefore, without writing a transistor or a circuit, even when data corresponding to a low luminance gradation is written, the data writing time can be shortened and the operation delay can be reduced.

  In this electronic circuit driving method, in the second step, the first transistor is turned off.

  According to this, the 1st transistor by which the conduction | electrical_connection state was set according to the signal at the 1st step can be made into an OFF state by the 2nd step before the following 1st step execution. As a result, the first transistor is turned off before the next first step is executed, and in the next first step, a signal, for example, a charge corresponding to the data current is written into the capacitor. For this reason, even when the data current is small, the data writing time can be further shortened, the operation delay can be further reduced, and the moving image characteristics can be further improved.

  In this electronic circuit driving method, the second terminal of the first transistor is electrically connected to a predetermined potential, and is applied to the first control terminal in the second step. The potential is different from the predetermined potential.

  According to this, in the second step, a potential different from the predetermined potential is applied to the first control terminal to change the conduction state of the first transistor or to turn off the first transistor. it can.

  In this electronic circuit driving method, an electronic element is connected to the first transistor.

  According to this, in the second step, the operation state of the electronic element is changed or the operation is reset (terminated) by changing the conduction state of the first transistor or turning off the first transistor. Can do.

  In this electronic circuit driving method, in the second step, the operation of the electronic element is reset by turning off the first transistor with a potential applied to the first control terminal.

  According to this, in the second step, the operation of the electronic element can be reset by turning off the first transistor with the potential applied to the first control terminal.

  Another electronic device driving method according to the present invention includes a plurality of first signal lines, a plurality of second signal lines, a plurality of third signal lines, a power supply line, and a plurality of unit circuits. In the electronic device driving method, each of the plurality of unit circuits includes a first transistor having a first terminal and a second terminal, and a third transistor having a third terminal and a fourth terminal. Two transistors, a capacitor connected in common to the first control terminal of the first transistor and the second control terminal of the second transistor, and the third transistor of the second transistor A third transistor having a fifth terminal and a sixth terminal for controlling electrical connection between the terminal and the second control terminal; and a seventh transistor having a seventh terminal and an eighth terminal. 4 transistors, and the third control terminal of the third transistor includes the plurality of transistors. The fourth control terminal and the eighth terminal of the fourth transistor are connected to one of the second signal lines, and the fourth control terminal and the eighth terminal are one of the plurality of first signal lines and the plurality of second terminals, respectively. A signal that is connected to one of the signal lines and that is supplied via one of the plurality of third signal lines while the third transistor and the fourth transistor are both on. A first step of accumulating charge in the capacitor element and setting a conduction state of the first transistor according to the signal; and turning off and turning on the fourth transistor and the third transistor, respectively. And a second step of supplying a charge amount to the capacitor element so as to reduce the conduction state of the first transistor set in the first step.

  According to this, in the second step, the capacitive element is changed in the next first step in a state where the conduction state of the first transistor set according to the signal in the first step is changed to be reduced. A signal, for example, a charge corresponding to a data current can be written to the signal. For this reason, even when the data current is small, the time required to write the data current can be shortened. As a result, it is possible to suppress the influence due to the wiring capacity of the data lines and the like, and when moving images are displayed, the occurrence of pseudo contours, image shifts, and the like are suppressed, and moving image characteristics can be improved. In addition, in order to change the conduction state of the first transistor, it is not necessary to provide a transistor or a circuit, and it is only necessary to control on / off of the third transistor and the second transistor.

  The electro-optical device driving method according to the present invention includes n rows of scanning lines each having a first sub-scanning line and a second sub-scanning line, m columns of data lines, power supply lines, the scanning lines, and the scanning lines. And a plurality of unit circuits arranged in n rows and m columns corresponding to the intersections of the data lines, wherein each of the plurality of unit circuits includes a first terminal and a plurality of unit circuits. A first transistor having a second terminal, a second transistor having a third terminal and a fourth terminal, a first control terminal of the first transistor, and a second transistor; A capacitive element commonly connected to a second control terminal; and a fifth terminal that controls electrical connection between the third terminal and the second control terminal of the second transistor; A third transistor having a sixth terminal, a seventh terminal and an eighth terminal; 4 transistors and an electro-optic element connected to the first transistor, and a third control terminal of the third transistor is the second sub-scan of one of the n rows of scanning lines. A fourth control terminal and an eighth terminal of the fourth transistor are connected to one of the first sub-scanning line and one of the m-column data lines of the n-row scanning line, respectively. A data signal supplied via one of the m columns of data lines to the capacitor element while both the third transistor and the fourth transistor are on. A first step of setting the conduction state of the second transistor and the first transistor according to the data signal, and turning off the fourth transistor and the third transistor, respectively. As down state, and the first second step of supplying an amount of charge that causes reduction in the conduction state of the set second transistor and the first transistor to said capacitive element at step comprises.

  According to this, in the second step, the capacitance is changed in the next first step in a state where the conduction state of the first transistor set in accordance with the data signal in the first step is reduced. A charge corresponding to a data signal, for example, a data current, can be written to the element. For this reason, even when the data current is small, the time required to write the data current can be shortened. As a result, it is possible to suppress the influence due to the wiring capacity of the data lines and the like, and when moving images are displayed, the occurrence of pseudo contours, image shifts, and the like are suppressed, and moving image characteristics can be improved. In addition, in order to change the conduction state of the first transistor, it is not necessary to provide a transistor or a circuit, and it is only necessary to control on / off of the third transistor and the second transistor.

  In the driving method of the electro-optical device according to the aspect of the invention, the electro-optical element may be three types of light-emitting elements that emit red, green, and blue light, and the unit circuit connected to each of the n rows of scanning lines may include the unit circuit Among the three types of light emitting elements, one type of light emitting element that emits light of the same color is included.

  According to this, since each of the scanning lines is connected with a light emitting element that emits light of the same color among the three types of light emitting elements that emit light of red, green, and blue, light emission of the light emitting element for each scanning line. By changing the timing of stopping the light emission, the light emission period of the light emitting element can be appropriately changed for each color. Thereby, a change in color balance due to a secular change or the like can be easily adjusted.

  In the driving method of the electro-optical device, the vertical scanning for selecting the n rows of scanning lines one by one in order in one frame period is performed at least twice, and in the first vertical scanning, the odd number of the n rows of scanning lines is an odd number. When selecting either one of the scanning lines of even rows or even rows, the conduction state of the first transistor of the unit circuit for one row connected to one selected scanning line among the plurality of unit circuits is selected as the data The second transistor of the unit circuit for one row connected to the selected one scanning line is turned on when either the odd row or the even row is selected. In this way, the first transistor is turned off, and in the second vertical scanning, one of the n scanning lines selected at the time of selection of the odd scanning line or the even scanning line is selected. The conduction state of the first transistor of the unit circuit for one row connected to the scanning line is set according to the data signal, and is selected when either the odd row or the even row is selected. The first transistor is turned off by turning on the second transistor of one row of unit circuits connected to one scanning line.

  According to this, by performing interlaced vertical scanning to form an image of one frame, a set period in which each scanning line is selected, the first transistor is turned on, and the electro-optic element is in an operating state. Is distributed without concentration, so that the load on the circuit is reduced. In addition, since the reset period for selecting each scanning line to turn off the first transistor and stopping the operation of the electro-optic element is distributed without being concentrated, the load on the circuit is reduced. Since the load on the circuit can be reduced in this way, a data signal having a larger current value can be supplied by the amount of the reduced load. Therefore, the operation delay due to the wiring capacity of the data line can be further reduced, and the set period can be further shortened. Therefore, data can be written at high speed, and even when the data current is small, the data write time can be further shortened to further reduce the operation delay, and the moving image characteristics can be further improved.

  In this method of driving the electro-optical device, in one frame period, the conduction state of the first transistor of the unit circuit for one row connected to one scanning line selected from the plurality of unit circuits is determined as the data signal. And a reset operation for stopping light emission of the light emitting element by turning off the first transistor by turning on the second transistor of the unit circuit for one row. , Alternately every time the scanning line is selected.

  According to this, by performing the interlaced scanning type vertical scanning as described above to form an image of one frame, each scanning line is selected, the conduction state of the first transistor is set, and the electro-optic element is Since the set periods to be operated are distributed without being concentrated, the circuit load is reduced. In addition, since the reset period for selecting each scanning line to turn off the first transistor and stopping the operation of the electro-optic element is distributed without being concentrated, the load on the circuit is reduced. Since the load on the circuit can be reduced in this way, a data signal having a larger current value can be supplied by the amount of the reduced load. Therefore, the operation delay due to the wiring capacity of the data line can be further reduced, and the set period can be further shortened. Therefore, data can be written at high speed, and even when the data current is small, the data writing time can be further shortened to further reduce the operation delay, and the moving image characteristics can be further improved.

  In the driving method of the electro-optical device, the scanning line on which the set operation is performed and the scanning line on which the reset operation is performed are selected in order from the plurality of scanning lines.

  According to this, the operation period of the electro-optic element can be changed by appropriately selecting the scanning line on which the reset operation is performed first. Accordingly, it is possible to easily set the operation period of the electro-optic element that can obtain the optimum moving image characteristics.

  An electronic circuit driving method according to the present invention includes a first transistor having a first terminal and a second terminal, a capacitor connected to a first control terminal of the first transistor, and the first transistor. A second transistor having a third terminal and a fourth terminal for controlling electrical connection between the terminal and the capacitor, and electrically connected via the fourth terminal and the capacitor And a third transistor electrically connected to the second terminal of the first transistor and having a fifth terminal and a sixth terminal, and a seventh terminal connected to the second terminal And a fourth transistor having an eighth terminal, wherein the second transistor and the third transistor are turned on, and the sixth terminal and the fourth transistor are turned on. 5 to supply a signal to the capacitor element. In the first step of accumulating electric charge according to the signal and setting the conduction state of the first transistor according to the signal, and by turning off the fourth transistor in the first step. And a second step of changing the set conduction state of the first transistor.

  According to this, in the first step, the second and third transistors are turned on, charges corresponding to the signal are accumulated in the capacitive element, and the conduction state of the first transistor is set according to the signal. Thereafter, in the second step, the conduction state of the first transistor set in the first step can be changed by turning off the fourth transistor. As a result, in a state where the conduction state of the first transistor set according to the signal in the first step is changed in the second step, a signal, for example, a data current is supplied to the capacitor element in the next first step. It is possible to write a charge corresponding to. For this reason, even when the data current is small, the time required to write the data current can be shortened. As a result, it is possible to suppress the influence due to the wiring capacity of the data lines and the like, and when moving images are displayed, the occurrence of pseudo contours, image shifts, and the like are suppressed, and moving image characteristics can be improved. In addition, in order to change the conduction state of the first transistor, it is not necessary to provide a transistor or a circuit, and it is only necessary to control on / off of the fourth transistor. Therefore, without writing a transistor or a circuit, even when data corresponding to a low luminance gradation is written, the data writing time can be shortened and the operation delay can be reduced.

  Another electronic device driving method according to the present invention includes a plurality of first signal lines, a plurality of second signal lines, a plurality of third signal lines, a power supply line, and a plurality of unit circuits. In the electronic device driving method, each of the plurality of unit circuits is connected to a first transistor having a first terminal and a second terminal, and a first control terminal of the first transistor. A capacitive element, a second transistor having a third terminal and a fourth terminal for controlling electrical connection between the first terminal and the capacitive element, the fourth terminal, and the A third transistor having a fifth terminal and a sixth terminal is electrically connected to the first control terminal of the first transistor through the capacitor, and is connected to the second terminal. A seventh transistor having a seventh terminal and an eighth terminal, and the second transistor The second control terminal of the register is connected to one of the plurality of second signal lines, and the third control terminal and the sixth terminal of the third transistor are respectively connected to the plurality of first signals. One of the signal lines and one of the plurality of third signal lines, and the third signal line is connected to the third signal line while both the second transistor and the third transistor are on. A first step of accumulating a signal supplied through one as a charge in the capacitor, and setting a conduction state of the first transistor according to the signal; and turning off the fourth transistor. And a second step.

  According to this, in the second step, the capacitive element is changed in the next first step in a state where the conduction state of the first transistor set according to the signal in the first step is changed to be reduced. A signal, for example, a charge corresponding to a data current can be written to the signal. For this reason, even when the data current is small, the time required to write the data current can be shortened. As a result, it is possible to suppress the influence due to the wiring capacity of the data lines and the like, and when moving images are displayed, the occurrence of pseudo contours, image shifts, and the like are suppressed, and moving image characteristics can be improved. Further, in order to change the conduction state of the first transistor so as to decrease, it is not necessary to provide a transistor or a circuit, and it is only necessary to control on / off of the fourth transistor.

  Another electro-optical device driving method according to the present invention includes n rows of scanning lines each having a first sub-scanning line and a second sub-scanning line, m columns of data lines, power supply lines, and the scanning lines. And a plurality of unit circuits arranged in n rows and m columns corresponding to the intersections of the data lines, wherein each of the plurality of unit circuits includes a first circuit A first transistor having a terminal and a second terminal; a capacitor connected to a first control terminal of the first transistor; and an electrical connection between the first terminal and the capacitor. A second transistor having a third terminal and a fourth terminal to be controlled, and electrically connected to the fourth terminal and a first control terminal of the first transistor through the capacitor A third transistor having a fifth terminal and a sixth terminal, and the second terminal A fourth transistor having a connected seventh terminal and an eighth terminal; and an electro-optic element connected to the first transistor; and a second control terminal of the second transistor Is connected to the second sub-scan line of one of the n rows of scan lines, and the third control terminal of the third transistor is connected to the first sub-scan line of one of the n rows of scan lines. And the sixth terminal is connected to one of the m columns of data lines, and one of the plurality of data lines while the second transistor and the third transistor are both on. A first step of storing a data signal supplied via the capacitor as charge in the capacitor element, and setting a conduction state of the first transistor according to the data signal; and turning off the fourth transistor. And a second step to That.

  According to this, in the second step, the capacitance is changed in the next first step in a state where the conduction state of the first transistor set in accordance with the data signal in the first step is reduced. A charge corresponding to a data signal, for example, a data current, can be written to the element. For this reason, even when the data current is small, the time required to write the data current can be shortened. As a result, it is possible to suppress the influence due to the wiring capacity of the data lines and the like, and when moving images are displayed, the occurrence of pseudo contours, image shifts, and the like are suppressed, and moving image characteristics can be improved. Further, in order to change the conduction state of the first transistor so as to decrease, it is not necessary to provide a transistor or a circuit, and it is only necessary to control on / off of the fourth transistor.

  The electronic device in the present invention uses the above driving method.

  According to this, it is possible to suppress the influence due to the wiring capacity of the data line and the like, and when moving images are displayed, the occurrence of pseudo contours, image shifts, and the like are suppressed, and moving image characteristics can be improved. In addition, the power load can be reduced, and stable and high-speed operation is possible.

  Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.

(First embodiment)
A first embodiment in which a method for driving an electronic device or an electro-optical device according to the present invention is applied to an organic EL display will be described with reference to FIGS.

  FIG. 1 is a block circuit diagram showing a circuit configuration of an organic EL display 10 as an electronic device or an electro-optical device. FIG. 2 is a block circuit diagram showing the internal circuit configuration of the display panel unit and the data line driving circuit. FIG. 3 is a circuit diagram showing the internal circuit configuration of the pixel circuit.

  In FIG. 1, the organic EL display 10 includes a display panel unit 11, a data line driving circuit 12, a scanning line driving circuit 13, a memory circuit 14, an oscillation circuit 15, a power supply circuit 16, and a control circuit 17.

  Each element 11 to 17 of the organic EL display 10 may be constituted by independent electronic components. For example, each of the elements 12 to 17 may be configured by a one-chip semiconductor integrated circuit device. Moreover, you may be comprised as an electronic component in which all or one part of each element 11-17 was united. For example, the data line driving circuit 12 and the scanning line driving circuit 13 may be integrally formed on the display panel unit 11. All or a part of each of the constituent elements 11 to 16 may be configured by a programmable IC chip, and the function may be realized by software by a program written in the IC chip.

  As shown in FIG. 2, the display panel unit 11 includes m columns of data lines X1 to Xm (m is an integer) extending along the column direction and n rows of scanning lines Y1 to Yn (n) extending along the row direction. Has a plurality of (n × m) pixel circuits 20 arranged in n rows and m columns at a position corresponding to an intersection with (integer). Each pixel circuit 20 corresponds to a unit circuit or an electronic circuit. In FIG. 2, only the data lines X1 to X9 among the data lines X1 to Xm are shown, and only the scanning lines Y1 to Y9 among the scanning lines Y1 to Yn are shown. Each pixel circuit 20 includes an organic EL element 21 as an electronic element, an electro-optical element, or a light emitting element. The organic EL element 21 is a light emitting element that emits light when supplied with a driving current.

  The pixel circuit 20 includes three types of pixel circuits, red, green, and blue pixel circuits 20R, 20G, and 20B. The red pixel circuit 20R, the green pixel circuit 20G, and the blue pixel circuit 20B each include an organic EL element 21 that emits red, green, and blue light from a light emitting layer made of an organic material. The red, green, and blue pixel circuits 20R, 20G, and 20B constitute one set, and one set constitutes one pixel.

  In addition, as shown in FIG. 2, the same color pixel circuit 20 is connected to each of the scanning lines Y1 to Yn. For example, in the present embodiment, m red pixel circuits 20R are provided for the scanning lines Y1, Y4, Y7, Y10..., And m green pixel circuits 20G are provided for the scanning lines Y2, Y5, Y8, Y11. The m number of blue pixel circuits 20B are connected to the scanning lines Y3, Y6, Y9, Y12.

  When any one of the scanning lines Y1, Y4, Y7, Y10... Is selected, a red data signal IDR as multi-value data is supplied to the selected scanning line via the data lines X1 to Xm. . When one of the scanning lines Y2, Y5, Y8, Y11... Is selected, a green data signal IDG as multi-value data is supplied to the selected scanning line via the data lines X1 to Xm. . When any one of the scanning lines Y3, Y6, Y9, Y12... Is selected, a blue data signal IDB as multi-value data is transmitted to the selected scanning line via the data lines X1 to Xm. It comes to be supplied. Note that each transistor, which will be described later, formed in each pixel circuit 20R, 20G, and 20B is generally configured by a thin film transistor (TFT).

  As shown in FIG. 3, each of the pixel circuits 20R, 20G, and 20B includes a driving transistor Qd as a first transistor having a drain (first terminal) and a source (second terminal), And a holding capacitor C1 as a capacitive element connected to the gate (first control terminal). Each pixel circuit 20R, 20G, and 20B includes a source (third terminal) and a drain (fourth terminal) that control electrical connection between the drain of the driving transistor Qd and the holding capacitor C1. The second switching transistor Qsw2 as the second transistor is provided. Further, each pixel circuit 20R, 20G, 20B includes a first switching transistor Qsw1 as a third transistor having a drain (fifth terminal) and a source (sixth terminal), a start transistor Qst, and an organic EL. An element 21 is provided.

  The driving transistor Qd is composed of a P-channel FET. The first and second switching transistors Qsw1, Qsw2 and the start transistor Qst are each configured by an N-channel FET.

  The drain of the driving transistor Qd is connected to the anode of the organic EL element 21 via the start transistor Qst, and the source thereof is connected to the power supply line L1. That is, the source (second terminal) of the driving transistor Qd is electrically connected to the power supply voltage Vdd as a predetermined potential. The cathode of the organic EL element 21 is grounded. A power supply voltage Vdd for driving the organic EL element 21 is supplied to the power supply line L1. A holding capacitor C1 as a capacitive element is connected between the gate of the driving transistor Qd and the power supply line L1.

  The gate of the driving transistor Qd is connected to the drain of the second switching transistor Qsw2. The source of the second switching transistor Qsw2 is connected to the drain of the first switching transistor Qsw1. The drain of the first switching transistor Qsw1 is connected to the drain of the driving transistor Qd. Furthermore, the source of the first switching transistor Qsw1 is connected to the data line Xm.

  The scanning lines Y1 to Yn include first sub-scanning lines Y11 to Yn1, second sub-scanning lines Y12 to Yn2, and third sub-scanning lines Y13 to Yn3, respectively. In FIG. 3, only the scanning line Yn and the three sub-scanning lines Yn1, Yn2, and Yn3 constituting the scanning line are shown. One of the scanning lines Y1 to Yn corresponding to the first sub-scanning lines Y11 to Yn1 among the scanning lines Y1 to Yn is connected to the gate (third control terminal) of the first switching transistor Qsw1. Further, one of the second sub-scanning lines Y12 to Yn2 of the corresponding scanning line among the scanning lines Y1 to Yn is connected to the gate (second control terminal) of the second switching transistor Qsw2. In FIG. 3, the first sub-scanning line Yn1 of the scanning line Yn is connected to the gate of the first switching transistor Qsw1, and the second sub-scanning line Yn2 of the scanning line Yn is connected to the gate of the second switching transistor Qsw2. ing.

  When one of the scanning lines Y1 to Yn, for example, the scanning line Yn is selected, the H level (high level) first scanning signal SCn1 supplied via the first sub scanning lines Yn1 and Yn2, respectively. , H level second scanning signal SCn2, the first and second switching transistors Qsw1 and Qsw2 are turned on. Furthermore, the gate of the start transistor Qst is one of the third sub-scanning lines Y13 to Yn3 (sub-scanning in FIG. 3) of the corresponding scanning line (scanning line Yn in FIG. 3) among the scanning lines Y1 to Yn. Line Yn3) is connected. The start transistor Qst is turned on by the third scanning signal SCn3 of H level output from the third sub-scanning line Yn3.

  Here, the operation of each pixel circuit 20 (20R, 20G, 20B) configured as described above will be briefly described. Since the pixel circuits 20R, 20G, and 20B perform the same operation, here, when the scanning line Y1 is selected instead of the operation of each pixel circuit 20 when any one of the scanning lines Y1 to Yn is selected. The operation of each of the red pixel circuits 20R will be described with reference to FIGS.

  When the scanning line Y1 is selected, during the set period Ts in FIG. 4, the first scanning signal SC11 having the H level and the second scanning signal SC12 having the H level are applied to the gates of the two transistors Qsw1 and Qsw2 of each red pixel circuit 20R. Are input via the first sub-scanning line Y11 and the second sub-scanning line Y12, respectively. As a result, both transistors Qsw1 and Qsw2 are turned on. At this time, the red data signal IDR is supplied from the data line Xm to each red pixel circuit 20R, and the charge amount corresponding to the red data signal IDR is held in the holding capacitor C1. As a result, the voltage applied to the gate of the driving transistor Qd becomes a voltage corresponding to the luminance gradation set by the current value of the red data signal IDR.

  Thereafter, the first scanning signal SC11 and the second scanning signal SC12 change from H level to L level (low level), respectively, and the third scanning signal SC13 changes from L level to H level. As a result, both the transistors Qsw1 and Qsw2 and the start transistor Qst are turned on, and the driving transistor Qd is in a conductive state corresponding to the gate voltage set by the amount of charge held in the holding capacitor C1. At this time, a driving current corresponding to the conduction state, that is, a driving current corresponding to the current value of the red data signal IDR flows to the organic EL element 21, and the organic EL element 21 emits light at a luminance gradation corresponding to the driving current. And then continue to emit light.

  Thus, when the scanning line Y1 is selected, each red pixel circuit 20R connected to the scanning line Y1 sets the driving transistor Qd to the ON state during the set period Ts shown in FIG. The organic EL element 21 is caused to emit light at a luminance gradation set by the current value of the data signal IDR. In the following description, the operation of setting the driving transistor Qd of each pixel circuit 20 to the on state and starting the light emission of the organic EL element 21 is referred to as “set operation”.

  Thereafter, in the reset period Tr of FIG. 4, the second switching transistor Qsw2 is turned on while the first switching transistor Qsw1 of each red pixel circuit 20R connected to the scanning line Y1 is kept off. That is, only the second scanning signal SC12 is changed from the L level to the H level during the reset period Tr while the first scanning signal SC11 and the second scanning signal SC12 are maintained at the L level after the set period Ts. As a result, the power supply voltage Vdd, which is a predetermined potential, and the holding capacitor C1 are electrically connected via the driving transistor Qd and the second switching transistor Qsw2. As a result, the holding capacitor C1 of each red pixel circuit 20R that has held the charge amount is reset to a reset voltage equal to or higher than Vdd−Vth (Vth is a threshold voltage of the driving transistor Qd). As a result, the driving transistor Qd is turned off, the supply of current to the organic EL element 21 is cut off, and the organic EL element 21 stops emitting light. In the following description, the operation of stopping the light emission of the organic EL element 21 of each pixel circuit 20 by setting the charge amount of the holding capacitor C1 to the reset voltage is referred to as “reset operation” or “reset”.

  The organic EL element 21 of each red pixel circuit 20R thus reset is in a non-light emitting state until the set operation is performed in the set period Ts of the next frame. That is, the pixel of the red pixel circuit 20R is in a non-light emitting state (dark state in the case of normally black), and the holding capacitor C1 of each red pixel circuit 20R is reset to the charge amount of the reset voltage. Wait for the start of the next set period Ts in the state. At this time, the start transistor Qst of each red pixel circuit 20R may be turned on, or may be turned off in order to sufficiently bring the organic EL element 21 into a non-light emitting state.

  The operation of each red pixel circuit 20R when the scanning line Y1 described above is selected is the same as each red pixel circuit 20R, each green pixel circuit 20G, and each of the other scanning lines Y1 to Yn. The same applies to the blue pixel circuit 20B.

  Thus, the driving method of each pixel circuit 20 in the present embodiment includes the following first step and second step.

  (First Step) Both transistors Qsw1 and Qsw2 are turned on. In this state, the data signal IDR supplied via one of the data lines X1 to Xm as the third signal line is supplied to the holding capacitor C1 via the source and drain of the first switching transistor Qsw1, and held. It accumulates as a charge in the capacitor C1. Thereby, the conduction state of the driving transistor Qd is set according to the data signal IDR.

  (Second Step) Both transistors Qsw1 and Qsw2 are turned off and on, respectively, to change the conduction state of the driving transistor Qd set in the first step. Here, the driving transistor Qd is turned off. Instead of turning off the driving transistor Qd, a charge amount that reduces the conduction state of the driving transistor Q set in the first step may be supplied to the holding capacitor C1. Here, “reducing the conduction state of the driving transistor Q” means changing the voltage applied to the gate of the driving transistor Qd in a direction approaching the reset voltage (Vdd−Vth), and changing the conductivity. To make it smaller.

  As shown in FIG. 2, the data line driving circuit 12 includes a single line driving circuit 30 for each of the data lines X1 to Xm. Each single line driving circuit 30 supplies red, green and blue data signals IDR, IDG and IDB to the red, green and blue pixel circuits 20R, 20G and 20B via the data lines X1 to Xm, respectively. When the internal state (the charge amount of the holding capacitor C1) is set according to the data signals IDR, IDG, and IDB, the red, green, and blue pixel circuits 20R, 20G, and 20B correspond to the organic EL elements 21. The value of the current flowing through is controlled.

  Each single line drive circuit 30 includes a data current generation circuit 30a. When any one of the scanning lines Y1 to Yn is selected, the data current generation circuit 30a outputs one of the red, green, and blue data signals IDR, IDG, and IDB corresponding to the selected scanning line. The data is supplied via any one of the data lines X1 to Xm. For example, when the scanning line Y1 is selected, the red data signal IDR is supplied via the data line X1. The red, green, and blue data signals IDR, IDG, and IDB generated by the data current generation circuit 30a of each single line drive circuit 30 are multivalued data. In this embodiment, 64 current values are used. This is a data signal.

  The scanning line driving circuit 13 performs vertical scanning at least two times for sequentially selecting n scanning lines Y1 to Yn one by one in one frame period.

  In the first vertical scanning, the n scanning lines Y1 to Yn are selected one by one in order, and the set operation is performed in the set period Ts in FIG. That is, the transistors Qsw1 and Qsw of each pixel circuit 20 (pixel circuit for one row) connected to one selected scanning line among the n × m pixel circuits 20 (20R, 20G, and 20B) are described above. As described above, each of the transistors is turned on, and the conduction state of the driving transistor Qd is set according to the data signal. Thereby, each organic EL element 21 of the n-row pixel circuit 20 connected to each of the n-row scanning lines Y1 to Yn is caused to emit light in order for each row. Here, “selecting n scanning lines Y1 to Yn one by one in order” means the first sub-scanning line Y11, the second sub-scanning line Y12, the first sub-scanning line Y21, and the second. Means that the first sub-scanning line Yn1 and the second sub-scanning line Yn2 are sequentially selected. The first and second sub-scan lines to be selected, for example, the first sub-scan line Y11 and the second sub-scan line Y12, are supplied with an H-level first scan signal SC11 and an H-level second scan signal SC12. Are respectively supplied to turn on both the transistors Qsw1 and the second switching transistor Qsw.

  In the second vertical scanning, the n scanning lines Y1 to Yn are selected one by one in order (here, the second sub-scanning lines Y12 to Yn2 of each scanning line are selected one by one in order). The reset operation is performed during the reset period Tr. That is, both transistors Qsw1 and Qsw of each pixel circuit 20 (pixel circuit for one row) connected to one selected scanning line among n × m pixel circuits 20 (20R, 20G, and 20B) are turned off. Each of the driving transistors Qd is set to the off state by setting the state to the on state. Thereby, the light emission of each organic EL element 21 of the n-row pixel circuit 20 connected to each of the n-row scanning lines Y1 to Yn is sequentially stopped for each row. Here, “selecting n scanning lines Y1 to Yn one by one in order” means the first sub-scanning line Y11, the second sub-scanning line Y12, the first sub-scanning line Y21, and the second. Means that the first sub-scanning line Yn1 and the second sub-scanning line Yn2 are sequentially selected. Then, the first scanning signal SC11 supplied to the first sub-scanning line to be selected, for example, the first sub-scanning line Y11 is kept at the L level. Further, the second scanning signal SC12 at the H level is supplied to the second sub-scanning line to be selected, for example, the second sub-scanning line Y12. Thereby, both the transistors Qsw1 and the second switching transistor Qsw are turned off and on, respectively.

  The memory circuit 14 stores image data supplied from the computer 18. The oscillation circuit 15 supplies the reference operation signal to other components of the organic EL display 10. The power supply circuit 16 supplies driving power for each component of the organic EL display 10.

  The control circuit 17 comprehensively controls the display panel unit 11 and the circuits 12 to 16. The control circuit 17 converts the image data stored in the memory circuit 14 representing the display state of the display panel unit 11 into matrix data representing the light emission gradation of each organic EL element 21. The matrix data includes a scanning line control signal CTS for designating scanning lines Y1 to Yn that output the first and second scanning signals SC11 to SCn1 and SC12 to SCn2 in order to select pixel circuits for one row. The matrix data includes a data line control signal CTD for determining the red, green and blue data signals IDR, IDG, IDB for setting the luminance of the organic EL elements 21 of the pixel circuit group selected for each row. Including. The scanning line control signal CTS is supplied to the scanning line driving circuit 13, and the data line control signal CTD is supplied to the data line driving circuit 12.

  Then, the control circuit 17 performs the selection operation of the scanning lines Y1 to Yn twice as described above to control the data line driving circuit 12 and the scanning line driving circuit 13 so that an image of one frame is formed. It has become.

  Next, a method for driving the organic EL display 10 by the control circuit 17 will be described with reference to FIG. FIG. 4 shows a timing chart of the first and second scanning signals SC11 to SCn1, SC12 to SCn2 output to the first and second sub-scanning lines Y11 to Yn1 and Y12 to Yn2 of the scanning lines Y1 to Yn.

  When one frame period is started by the vertical scanning start signal, the first vertical scanning is started. In the first vertical scanning, as described above, each drive of the pixel circuits 20 for one row connected to one scanning line selected from the n × m pixel circuits 20 (20R, 20G, 20B). The conduction state of the transistor Qd is set according to the data signal (the above set operation is performed). Thereby, each organic EL element 21 of the pixel circuit 20 for n rows respectively connected to the scanning lines Y1 to Yn of n rows is caused to emit light in order for each row.

  Thereafter, the second vertical scanning is performed. In the second vertical scanning, as described above, each drive of the pixel circuits 20 for one row connected to one scanning line selected from the n × m pixel circuits 20 (20R, 20G, 20B). Transistors Qd are sequentially set to an off state. Thereby, the light emission of each organic EL element 21 of the pixel circuit 20 for n rows connected to the n scanning lines Y1 to Yn is sequentially stopped for each row (the reset operation is performed). Thus, one frame image is formed.

  In this way, the sequential scanning type vertical scanning is performed twice in one frame period, and each driving transistor of the pixel circuit 20 for one row connected to the n scanning lines Y1 to Yn by the first vertical scanning is performed. The conduction state of Qd is set in order. Thereby, the organic EL elements 21 of the pixel circuits 20 for n rows connected to the n rows of scanning lines Y1 to Yn are caused to emit light sequentially for each row, thereby forming an image of one frame.

  Next, features of the driving method of the organic EL display 10 according to the first embodiment will be described below.

  (1) By setting the conduction state of the driving transistor Qd of each pixel circuit 20 (20R, 20G, 20B) according to the data signal in the set period Ts of FIG. 4, the data signal (IDR, IDG, IDB) The organic EL element 21 of each pixel circuit 20 can be caused to emit light at a luminance gradation set by the current value.

  The electro-optical device drives the voltage according to the data current supplied from the data signal output circuit according to the light emission gradation after the source-gate between the source and gate of the driving transistor Qd is set to the threshold voltage of the transistor in advance. This is a method of applying to the gate of the transistor Qd. This method is excellent in that the organic EL element can be driven with a driving current having a value corresponding to the value of the data current by compensating for variations in characteristics such as the threshold voltage of the driving transistor Qd.

  (2) After the light emission of the organic EL element 21 of each pixel circuit 20 is started, the second switching transistor Qsw2 is turned on during the reset period Tr in FIG. 4 to drive the power supply voltage Vdd and the holding capacitor C1. The transistors Qd and the second switching transistor Qsw2 are electrically connected. As a result, the holding capacitor C1 is reset to a reset voltage equal to or higher than Vdd−Vth, the driving transistor Qd is turned off, and the supply of current to the organic EL element 21 is cut off, so that the organic EL element 21 emits light. It can be stopped in a short time.

  (3) Write a data signal, that is, a charge corresponding to the data current, to the holding capacitor C1 when the next frame is formed with the driving transistor Qd turned off and the light emission of the organic EL element 21 stopped. become.

That is, since the holding capacitor C1 is in a state of being charged in advance by a reset voltage equal to or higher than Vdd−Vth, the influence of the wiring capacitance of the data line Xn is suppressed to a low level. The amount of charge (data value) is reached. As a result, the organic EL element 21 can be made to emit light with a set luminance gradation in a short time. For this reason, even when the data current has a small value as in the case of the low luminance gradation, the time required to write the data current can be shortened. As a result, it is possible to suppress the influence due to the wiring capacity of the data lines and the like, and when moving images are displayed, the occurrence of pseudo contours, image shifts, and the like are suppressed, and moving image characteristics can be improved.
(4) In order to turn off the driving transistor Qd, it is not necessary to provide a transistor or a circuit, and it is only necessary to control on and off of the first and second switching transistors Qsw1 and Qsw2. Therefore, even when writing data corresponding to a low luminance gradation without increasing the voltage generation circuit for generating the reset voltage and the transistor for applying the reset voltage to the holding capacitor C1, the data writing time is shortened and the operation is performed. Delay can be reduced. That is, the influence of the parasitic capacitance can be suppressed by setting the write current level relatively higher than when the entire period of one frame is used as the light emission period.

  (5) Since the light emission period of the organic EL element 21 of each pixel circuit 20 is shortened, the power consumption can be reduced as compared with the conventional case where the organic EL element 21 continues to emit light until the next frame is started. .

  (6) Since the data writing time can be shortened, data can be written at high speed.

  (7) As shown in FIG. 2, since the same color pixel circuit 20 is connected to each of the scanning lines Y1 to Yn, the timing at which the light emission of the organic EL element 21 is stopped for each of the scanning lines Y1 to Yn. By changing, the light emission period of the organic EL element 21 can be appropriately changed for each color. Thereby, a change in color balance due to a secular change or the like can be easily adjusted.

  (8) The reset organic EL element 21 of each pixel circuit 20 is in a non-light emitting state until the set operation is performed in the set period Ts of the next frame. In other words, the pixel of each pixel circuit 20 is in a dark state, and the holding capacitor C1 waits for the start of the next set period Ts in a state where it is reset to the charge amount of the reset voltage. The reset organic EL element 21 of each pixel circuit 20 is in a non-light emitting state until the set operation is performed in the set period Ts of the next frame. That is, the pixel of the red pixel circuit 20R is in the dark state, and when the set operation is performed in the next set period Ts, the image is displayed from the dark state. Therefore, impulse-type display can be performed, and the organic EL display 10 suitable for moving images can be realized.

(Second Embodiment)
Next, a driving method of the organic EL display 10 according to the second embodiment will be described with reference to FIG. In the first embodiment, a sequential scanning type vertical scanning is performed twice in one frame period to form an image of one frame, but in this embodiment, an interlaced vertical scanning is performed to perform 1 Construct a frame image. FIG. 5 is a timing chart similar to FIG.

  A method of driving the organic EL display 10 by the control circuit 17 will be described with reference to FIG. When one frame period is started by the vertical scanning start signal, vertical scanning for selecting n rows of scanning lines Y1 to Yn one by one in order in one frame period is performed twice.

  In the first vertical scanning, the above set operation is performed when odd-numbered scanning lines Y1, Y3, Y5,. That is, similarly to the first vertical scanning described with reference to FIG. 4, the conduction state of each driving transistor Qd of the pixel circuit 20 for one row connected to one selected scanning line among the plurality of pixel circuits 20 is determined. Set according to the data signal. Thereby, the light emission of the organic EL element 21 of each pixel circuit 20 connected to one selected scanning line is started. At the same time, the above-mentioned reset operation is performed when the scanning lines Y2, Y4, Y6,. That is, as in the second vertical scanning described with reference to FIG. 4, the second switching transistors Qsw2 of the pixel circuits 20 for one row connected to one selected scanning line among the plurality of pixel circuits 20 are turned on. To. As a result, each driving transistor Qd set to the conductive state is turned off, and light emission of the organic EL element 21 of each pixel circuit 20 connected to one selected scanning line is stopped.

  In the second vertical scanning, the reset operation is performed when the odd-numbered scanning lines Y1, Y3, Y5,... Yn-1 among the n-th scanning lines Y1 to Yn are selected. As a result, the driving transistors Qd of the pixel circuits 20 of each row connected to the selected one scanning line and set to the conductive state in the first vertical scanning are turned off, and the organic EL element 21 is turned off. Stop flashing. At the same time, the above set operation is performed when the scanning lines Y2, Y4, Y6,. Thereby, the conduction state of each driving transistor Qd of the pixel circuit 20 for one row connected to one selected scanning line is set according to the data signal, and the light emission of the organic EL element 21 of each pixel circuit 20 is performed. Let it begin.

  Thus, in the first vertical scanning, the n scanning lines Y1 to Yn are selected one by one in order, the set operation is performed when the odd-numbered scanning lines are selected, and the reset operation is performed when the even-numbered rows are selected. In the second vertical scanning thereafter, contrary to the first, a reset operation is performed when an odd-numbered scan line is selected, and a set operation is performed when an even-numbered row is selected. By thus performing vertical scanning twice in one frame period, all of the n rows of scanning lines Y1 to Yn are selected twice for the set operation and the reset operation.

  Next, in addition to the advantages of the organic EL display driving method according to the first embodiment described above, the organic EL display driving method according to the second embodiment has the following advantages.

  (9) By performing interlaced vertical scanning as described above to form an image of one frame, the set periods Ts for selecting the respective scanning lines Y1 to Yn and performing the set operation are dispersed without being concentrated. Therefore, the load on the circuits such as the data line driving circuit 12 and the scanning line driving circuit 13 is reduced. In addition, since the reset periods Tr for performing the reset operation by selecting each of the scanning lines Y1 to Yn are distributed without being concentrated, the load on the circuits such as the data line driving circuit 12 and the scanning line driving circuit 13 is reduced. .

(Third embodiment)
Next, a driving method of the organic EL display according to the third embodiment will be described with reference to FIG. In the present embodiment, interlaced scanning vertical scanning is performed to form an image of one frame. FIG. 6 is a timing chart similar to FIG.

  A method of driving the organic EL display 10 by the control circuit 17 will be described with reference to FIG.

  When one frame period is started by the vertical scanning start signal, the set operation and the reset operation are alternately performed every time one of the scanning lines Y1 to Yn is selected in one frame period. That is, the set operation for setting the conduction state of each driving transistor Qd of the pixel circuit 20 for one row according to the data signal, and the second switching transistor Qsw2 of the pixel circuit 20 for one row are turned off to turn the organic EL element The reset operation for stopping the light emission of 21 is alternately performed every time a scanning line is selected. At the same time, the scanning line on which the set operation is performed and the scanning line on which the reset operation is performed are selected in order from the plurality of scanning lines Y1 to Yn.

  Specifically, in this embodiment, when one frame period is started, the plurality of scanning lines Y1 to Yn are selected one by one in the following order, and each time a scanning line is selected, a set operation and a reset operation are performed. Alternately. That is, Y1 (s) → Y3 (r) → Y2 (s) → Y4 (r) → Y3 (s) → Y5 (r) → Y4 (s) → Y6 (r) → Y5 (s) → Y7 (illustrated) Abbreviation: (r)) → Y6 (s) →..., Yn-1 (s) → Y1 (r) → Yn (s) → Y2 (r). Here, s and r represent a set operation and a reset operation, respectively. In this one order, all the scanning lines Y1 to Yn are each selected twice.

  In this way, the set operation and the reset operation are alternately performed every time a scanning line is selected. Further, the scanning lines for which the set operation is performed are sequentially selected from the scanning lines Y1 to Yn, and the scanning lines for which the reset operation is performed are sequentially selected from the scanning lines Y3 to Yn, and further, Y1 and Y2.

  Next, characteristics of the driving method of the organic EL display 10 according to the third embodiment will be described below.

  (10) By performing the interlaced vertical scanning as described above to form an image of one frame, the set periods Ts for selecting the scanning lines Y1 to Yn and performing the setting operation are dispersed without being concentrated. Therefore, the load on the circuits such as the data line driving circuit 12 and the scanning line driving circuit 13 is reduced. In addition, since the reset periods Tr for performing the reset operation by selecting each of the scanning lines Y1 to Yn are distributed without being concentrated, the load on the circuits such as the data line driving circuit 12 and the scanning line driving circuit 13 is reduced. .

  (11) In the present embodiment, the scanning line that is selected next to the scanning line Y1 in the first row and first reset is set as the scanning line Y3 in the third row. That is, the scanning line Y3 is selected at the timing indicated by the symbol A in FIG. 6 and the reset operation is performed. By delaying the scanning line on which the reset operation is performed first, the light emission period of the organic EL element 21 of each pixel circuit 20 can be shortened. For example, when the scanning line to be reset first is changed to the scanning line Y4 in the fourth row and the resetting operation is performed with reference A ′ in FIG. That is, the reset period Tr is changed from the position indicated by the symbol B to the position indicated by the symbol B ′, and the light emission period is shortened. Here, the “light emission period” refers to a period from the start of light emission of the organic EL element 21 in each pixel circuit 20 to the stop of the light emission. Therefore, the light emission period can be changed by appropriately selecting the scanning line on which the reset operation is performed first.

(Fourth embodiment)
Next, a fourth embodiment in which the driving method of the electronic device or the electro-optical device according to the invention is applied to an organic EL display will be described with reference to FIG. FIG. 7 is a circuit diagram showing the internal circuit configuration of the pixel circuit in the organic EL display 10 described in the first embodiment.

  In the present embodiment, the present invention is applied to an organic EL display 10 configured by using the pixel circuits 20′R, 20′G, and 20′B shown in FIG. 7 instead of the pixel circuits 20R, 20G, and 20B shown in FIG. It is applied. Other configurations are the same as those in the first embodiment. Accordingly, the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 7, each of the pixel circuits 20′R, 20′G, and 20′B has a driving transistor as a first transistor having a drain (first terminal) and a source (second terminal). Qd and a conversion transistor Qc as a second transistor. The conversion transistor Qc has a gate (second control terminal), a drain (third terminal), and a source (fourth terminal) connected to the gate (first control terminal) of the driving transistor Qd. Prepare.

  Each of the pixel circuits 20′R, 20′G, and 20′B includes a holding capacitor C1 that is commonly connected to the gate of the driving transistor Qd and the gate of the conversion transistor Qc, and a second transistor as a third transistor. A switching transistor Qsw2. The second switching transistor Qsw2 controls the electrical connection between the drain and gate of the conversion transistor Qc and includes a drain (fifth terminal) and a source (sixth terminal).

  Furthermore, each pixel circuit 20′R, 20′G, 20′B includes a first switching transistor Qsw1 as a fourth transistor having a drain (seventh terminal) and a source (eighth terminal). Yes.

  Here, the operations of the pixel circuits 20′R, 20′G, and 20′B will be briefly described. Here, as in the case described above with reference to FIG. 3, only the operation of the red pixel circuit 20′R when any one of the scanning lines Y1 to Yn, for example, the scanning line Y1 is selected, is illustrated. 7 will be described.

  When the scanning line Y1 is selected, during the set period Ts (see FIG. 4), the first scanning signals SC11 and H level of the H level are applied to the gates of the transistors Qsw1 and Qsw2 of the red pixel circuit 20′R. The second scanning signal SC12 is input via the first sub-scanning line Y11 and the second sub-scanning line Y12. As a result, both transistors Qsw1 and Qsw2 are turned on. At this time, the red data signal IDR is supplied from the data line Xm to each red pixel circuit 20′R, and the charge amount corresponding to the red data signal IDR is held in the holding capacitor C1. As a result, the voltage applied to the gate of the driving transistor Qd becomes a voltage corresponding to the luminance gradation set by the current value of the red data signal IDR.

  Thereafter, the first scanning signal SC11 and the second scanning signal SC12 change from the H level to the L level, respectively. As a result, both the transistors Qsw1 and Qsw2 are turned on, and the driving transistor Qd is in a conductive state corresponding to the gate voltage set by the amount of charge held in the holding capacitor C1. At this time, a driving current corresponding to the conduction state, that is, a driving current corresponding to the current value of the red data signal IDR flows to the organic EL element 21, and the organic EL element 21 emits light at a luminance gradation corresponding to the driving current. And then continue to emit light.

  Thus, when the scanning line Y1 is selected, the red pixel circuit 20′R connected to the scanning line Y1 changes the conduction state of the conversion transistor Qc and the driving transistor Qd during the set period Ts. It is set according to the signal IDR, and the organic EL element 21 is caused to emit light at a luminance gradation set by the current value of the signal (set operation).

  Thereafter, with the first switching transistor Qsw1 turned off, the second scanning signal SC12 is changed from L level to H level during the reset period Tr (see FIG. 4), and the second switching transistor Qsw2 is turned on. . As a result, the power supply voltage Vdd and the holding capacitor C1 are electrically connected via the driving transistor Qd and the second switching transistor Qsw2. As a result, the holding capacitor C1 of each red pixel circuit 20′R that holds the charge amount is reset to a reset voltage equal to or higher than Vdd−Vth. As a result, the driving transistor Qd is turned off, the supply of current to the organic EL element 21 is cut off, and the organic EL element 21 stops emitting light (reset operation).

  The organic EL element 21 of the red pixel circuit 20′R thus reset is in a non-emission state until the set operation is performed in the reset period Tr of the next frame. That is, the pixel of the red pixel circuit 20′R is in a non-light emitting state (dark state in the case of normally black), and the holding capacitor C1 of each red pixel circuit 20′R has a charge amount of the reset voltage. Waiting for the start of the next set period Ts in the reset state.

  The operation of each red pixel circuit 20′R when the scanning line Y1 described above is selected is the same as each red pixel circuit 20′R and each green pixel when the other scanning lines Y1 to Yn are selected. The same applies to the circuit 20′G and each blue pixel circuit 20′B.

  Thus, the driving method of each pixel circuit 20 in the present embodiment includes the following first step and second step.

  (First Step) Both transistors Qsw1 and Qsw2 are turned on. In this state, the data signal IDR supplied via one of the data lines X1 to Xm as the third signal line is supplied to the holding capacitor C1 via the source and drain of the first switching transistor Qsw1, and held. It accumulates as a charge in the capacitor C1. Thus, the conduction state of the conversion transistor Qc and the driving transistor Qd is set according to the data signal IDR.

  (Second Step) The transistors Qsw1 and Qsw2 are turned off and on, respectively, to change the conduction states of the conversion transistor Qc and the driving transistor Qd set in the first step. Here, for example, both transistors Qc and Qd are both turned off. Instead of turning off both transistors Qd and Qc, an amount of charge that reduces the conduction state of both transistors Qc and Qd set in the first step may be supplied to holding capacitor C1.

  Next, features of the driving method of the organic EL display 10 according to the fourth embodiment will be described below.

  (12) Also according to this embodiment, the same effects (1) to (8) can be achieved as in the first embodiment. In addition, as a driving method in this embodiment, the interlaced vertical scanning described in the second embodiment and the interlaced vertical scanning described in the third embodiment are employed, so that data can be written at high speed. Can be realized.

(Fifth embodiment)
Next, a fifth embodiment in which the driving method of the electronic device or the electro-optical device according to the invention is applied to an organic EL display will be described with reference to FIG. FIG. 8 is a circuit diagram showing the internal circuit configuration of the pixel circuit in the organic EL display 10 described in the first embodiment.

  In the present embodiment, an organic EL display 10 configured by using pixel circuits 20 ″ R, 20 ″ G, and 20 ″ B shown in FIG. 8 instead of the pixel circuits 20R, 20G, and 20B shown in FIG. The present invention is applied. Other configurations are the same as those in the first embodiment. Accordingly, the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 8, each pixel circuit 20 ″ R, 20 ″ G, 20 ″ B includes a driving transistor Qd as a first transistor and a gate (first control transistor) of the driving transistor Qd. A holding capacitor C1 connected to the terminal), and a second switching transistor Qsw2 as a second transistor. The second switching transistor Qsw2 controls the electrical connection between the drain (first terminal) of the driving transistor Qd and the holding capacitor C1, and the source (third terminal) and the drain (fourth terminal). With.

  The source of the second switching transistor Qsw2 is connected to the drain (first terminal) of the driving transistor Qd, and the drain of the second switching transistor Qsw2 is connected to the gate of the driving transistor Qd. The gate (second control terminal) of the second switching transistor Qsw2 is connected to one of the second sub-scanning lines Y12 to Yn2.

  Each pixel circuit 20 ″ R, 20 ″ G, 20 ″ B includes a first switching transistor Qsw1 as a third transistor and a start transistor Q3 as a fourth transistor. The source (fifth terminal) of the first switching transistor Qsw1 is electrically connected to the drain of the second switching transistor Qsw2 via the holding capacitor C1 and is electrically connected to the source (second terminal) of the driving transistor Qd. It is connected to the. The drain (sixth terminal) of the first switching transistor Qsw1 is connected to one of the data lines X1 to Xm, and the gate (third control terminal) of the first switching transistor Qsw1 is the second sub-transistor. It is connected to one of the scanning lines Y12 to Yn2.

  The start transistor Q3 is a P-channel TFT, and its drain (seventh terminal) is connected to the source of the driving transistor Qd. The source (eighth terminal) of the start transistor Q3 is connected to the power supply line L1, and its gate (fourth control terminal) is connected to one of the third sub-scanning lines SC13 to SCn3. Yes.

  Here, the operations of the pixel circuits 20 ″ R, 20 ″ G, and 20 ″ B will be briefly described. Here, only the operation of each red pixel circuit 20 ″ R when the scanning line Y1 is selected will be described with reference to FIG.

  When the scanning line Y1 is selected, during the set period Ts (see FIG. 4), the first scanning signals SC11 and H level of H level are supplied to the gates of the transistors Qsw1 and Qsw2 of the red pixel circuit 20 ″ R. The second scanning signal SC12 is input via the first sub-scanning line Y11 and the second sub-scanning line Y12. As a result, both transistors Qsw1 and Qsw2 are turned on. At this time, the red data signal IDR is supplied from the data line Xm to each red pixel circuit 20 ″ R, and the amount of charge corresponding to the red data signal IDR is held in the holding capacitor C1. As a result, the voltage applied to the gate of the driving transistor Qd becomes a voltage corresponding to the luminance gradation set by the current value of the red data signal IDR.

  Thereafter, the first scanning signal SC11, the second scanning signal SC12, and the third scanning signal SC13 are changed from the H level to the L level (low level), and the third scanning signal SC13 is changed from the L level to the H level. As a result, both transistors Qsw1 and Qsw2 are turned off, and the start transistor Q3 is turned on. Since both the transistors Qsw1 and Qsw2 are turned off, the driving transistor Qd becomes a conductive state corresponding to the gate voltage set by the amount of charge held in the holding capacitor C1. At this time, a driving current corresponding to the conduction state, that is, a driving current corresponding to the current value of the red data signal IDR flows to the organic EL element 21, and the organic EL element 21 emits light at a luminance gradation corresponding to the driving current. And then continue to emit light.

  Thus, when the scanning line Y1 is selected, each of the red pixel circuits 20 ″ R connected to the scanning line Y1 sets the driving transistor Qd to the on state during the set period Ts shown in FIG. Then, the organic EL element 21 is caused to emit light at a luminance gradation set by the current value of the red data signal IDR (set operation).

  Thereafter, the third scanning signal SC13 is changed from the L level to the H level in the reset period Tr (see FIG. 4) while both the transistors Qsw1 and Qsw2 are kept off. Thereby, the start transistor Q3 is turned off, the supply of current to the organic EL element 21 is cut off, and the organic EL element 21 stops emitting light.

  The organic EL element 21 of the red pixel circuit 20R thus reset is in a non-light emitting state until the set operation is performed in the reset period Tr of the next frame, and the holding capacitor C1 has the charge amount of the reset voltage. Waiting for the start of the next set period Ts in the reset state.

  The operation of each red pixel circuit 20 ″ R when the scanning line Y1 described above is selected is the same as each red pixel circuit 20 ″ R and each green pixel when the other scanning lines Y1 to Yn are selected. The same applies to the pixel circuit 20 ″ G and the blue pixel circuit 20 ″ B.

  Thus, the driving method of each pixel circuit 20 in the present embodiment includes the following first step and second step.

  (First Step) Both transistors Qsw1 and Qsw2 are turned on. In this state, the data signal IDR supplied via one of the data lines X1 to Xm as the third signal line is supplied to the holding capacitor C1 via the drain and source of the first switching transistor Qsw1 and held. It accumulates as a charge in the capacitor C1. Thereby, the conduction state of the driving transistor Qd is set according to the data signal IDR.

  (Second Step) The start transistor Q3 is turned off, and the organic EL element 21 changes the stop of light emission.

  Next, characteristics of the driving method of the organic EL display 10 according to the fifth embodiment will be described below.

  (13) Also according to this embodiment, the same effects (1) to (8) can be achieved as in the first embodiment. In addition, as a driving method in this embodiment, the interlaced vertical scanning described in the second embodiment and the interlaced vertical scanning described in the third embodiment are employed, so that data can be written at high speed. Can be realized.

(Electronics)
Next, application of the electronic device will be described with reference to FIG. The organic EL display 10 described in the above embodiments can be applied to various electronic devices such as mobile personal computers, mobile phones, and digital cameras.

  FIG. 9 shows a configuration of a mobile phone on which the organic EL display 10 is mounted. In FIG. 9, the mobile phone 70 includes a plurality of operation buttons 71, an earpiece 72, a mouthpiece 73, and a display unit 74 using the organic EL display 10. Even in this case, the display unit 74 using the organic EL display 10 exhibits the same effect as in the above embodiment. As a result, the mobile phone 70 can realize image display with few defects.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the source (second terminal) of the driving transistor Qd is electrically connected to the power supply voltage Vdd as a predetermined potential, but the predetermined potential is not limited to the power supply voltage.
In each of the above embodiments, a P-channel FET is used as the driving transistor Qd, but an N-channel FET may be used as the driving transistor. In that case, when the voltage applied to the gate of the driving transistor is equal to or lower than Vdd + Vth (potential different from the power supply voltage Vdd), the driving transistor is turned off. As a result, the holding capacitor C1 of each pixel circuit is reset to a reset voltage equal to or lower than Vdd + Vth.
In each of the above embodiments, the pixel circuit 20 is embodied as an electronic circuit to obtain a suitable effect. However, a current other than the organic EL element 21 such as a light emitting element such as an LED, FED, electron emitting element, or plasma element is used. You may embody in the electronic circuit which drives a drive element. The present invention may be embodied in a storage device such as a RAM.
In each of the above embodiments, the organic EL element 21 is embodied as the current drive element of the pixel circuits 20R, 20G, and 20B, but may be embodied as an inorganic EL element. That is, you may apply this invention to the inorganic EL display which consists of an inorganic EL element. Furthermore, the present invention can be applied to a liquid crystal display, and the moving image characteristics of the liquid crystal display can be improved.
In each of the above embodiments, the organic EL display is provided with the pixel circuits 20R, 20G, and 20B for each color with respect to the organic EL elements 21 of the three colors. You may apply to.

The block circuit diagram which shows the organic electroluminescent display of 1st Embodiment. The circuit diagram which shows the display panel part of 1st Embodiment. FIG. 2 is a circuit diagram illustrating a pixel circuit and a data line driving circuit according to the first embodiment. The timing chart for demonstrating the drive method of 1st Embodiment. The timing chart for demonstrating the drive method of 2nd Embodiment. The timing chart for demonstrating the drive method of 3rd Embodiment. The circuit diagram which shows the pixel circuit and data line drive circuit of 4th Embodiment. The circuit diagram which shows the pixel circuit and data line drive circuit of 5th Embodiment. The perspective view which shows the structure of a mobile telephone.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Organic EL display as an electronic device or an electro-optical device, 11 ... Display panel part, 20 ... Pixel circuit, 20R ... Pixel circuit for red as a unit circuit or an electronic circuit, 20G ... For green as a unit circuit or an electronic circuit Pixel circuit, 20B ... Blue pixel circuit as unit circuit or electronic circuit, 21 ... Electronic element, organic EL element as electro-optical element or light emitting element, 70 ... Cell phone as electronic device, L1 ... Power supply line, Y1- Yn: scanning line, Y11-Yn1: first sub-scanning line as first signal line, Y12-Yn2: second sub-scanning line as second signal line, X1-Xm: third signal line As a data line, Qd: a driving transistor as a first transistor, Qsw1: a first switching transistor as a second transistor or a third transistor Data, Qsw2 ... third transistor and the second switching transistor of the fourth transistor, Qc ... conversion transistor as the second transistor, Qst ... starting transistor, Q3 ... starting transistor as a fourth transistor.

Claims (17)

A plurality of first signal lines; a plurality of second signal lines; and a plurality of unit circuits arranged corresponding to intersections of the plurality of first signal lines and the plurality of second signal lines; A method for driving an electronic device comprising:
A first step of performing a set operation on a first group of unit circuits connected to the first first signal line of the plurality of first signal lines among the plurality of unit circuits;
A second step of performing a reset operation on a second group of unit circuits connected to a second first signal line among the plurality of first signal lines among the plurality of unit circuits;
A third step of performing a set operation on a third group of unit circuits connected to a third first signal line of the plurality of first signal lines among the plurality of unit circuits;
A fourth step of performing a reset operation on a fourth group of unit circuits connected to a fourth first signal line among the plurality of first signal lines among the plurality of unit circuits; Including
The first first signal line and the third first signal line are adjacent to each other;
The second first signal line and the fourth first signal line are adjacent to each other;
A method for driving an electronic device. The method of driving an electronic device according to claim 1,
Selecting each of the plurality of first signal lines at least twice within one frame period in which data signals are supplied to all of the plurality of unit circuits via the plurality of second signal lines;
A method for driving an electronic device. The method for driving an electronic device according to claim 1 or 2,
Between the end of the first step and the execution of the second step, no set operation or reset operation is performed on any unit circuit of the plurality of unit circuits,
Between the end of the second step and the execution of the third step, no set operation or reset operation is performed on any of the plurality of unit circuits,
Between the end of the third step and the execution of the fourth step, no set operation or reset operation is performed on any of the plurality of unit circuits.
A method for driving an electronic device. A plurality of first signal lines; a plurality of second signal lines; and a plurality of unit circuits arranged corresponding to intersections of the plurality of first signal lines and the plurality of second signal lines; A method for driving an electronic device comprising:
A first step of performing a set operation on a first group of unit circuits connected to the first first signal line of the plurality of first signal lines among the plurality of unit circuits;
A second step of performing a reset operation on a second group of unit circuits connected to a second first signal line among the plurality of first signal lines among the plurality of unit circuits;
A third step of performing a set operation on a third group of unit circuits connected to a third first signal line of the plurality of first signal lines among the plurality of unit circuits;
A fourth step of performing a reset operation on a fourth group of unit circuits connected to a fourth first signal line among the plurality of first signal lines among the plurality of unit circuits;
A fifth step of performing a reset operation on the first group of unit circuits;
A sixth step of performing a set operation on the second group of unit circuits;
A seventh step of performing a reset operation on the unit circuits of the third group;
An eighth step of performing a set operation on the unit circuits of the fourth group,
The first first signal line and the third first signal line are adjacent to each other;
The second first signal line and the fourth first signal line are adjacent to each other;
A method for driving an electronic device. The method for driving an electronic device according to claim 4,
Between the end of the first step and the execution of the second step, no set operation or reset operation is performed on any unit circuit of the plurality of unit circuits,
Between the end of the second step and the execution of the third step, no set operation or reset operation is performed on any of the plurality of unit circuits,
Between the end of the third step and the execution of the fourth step, no set operation or reset operation is performed on any of the plurality of unit circuits.
A method for driving an electronic device. The method for driving an electronic device according to claim 5,
Performing the first step and the fifth step within one frame period in which data signals are supplied to all of the plurality of unit circuits via the plurality of second signal lines;
A method for driving an electronic device. The method for driving an electronic device according to claim 1,
Each of the plurality of unit circuits includes a first transistor,
Setting the conduction state of the first transistor according to a data signal supplied through one second signal line of the plurality of second signal lines by the set operation;
A method for driving an electronic device. The method of driving an electronic device according to claim 7.
Reducing the conduction state of the first transistor set by the set operation by the reset operation;
A method for driving an electronic device. The method of driving an electronic device according to claim 7.
Turning off the first transistor by the reset operation;
A method for driving an electronic device. The method for driving an electronic device according to claim 1,
Each of the plurality of unit circuits includes an electronic element,
Stopping the electronic element by the reset operation;
A method for driving an electronic device. The method for driving an electronic device according to claim 1,
Each of the plurality of unit circuits includes a driving transistor and a first switching transistor,
By the setting operation, the driving transistor is set to a conductive state corresponding to a data signal supplied through one second signal line of the plurality of second signal lines and the first switching transistor. And
The reset operation turns off the first switching transistor and turns off the driving transistor;
A method for driving an electronic device. The method for driving an electronic device according to claim 1,
Each of the plurality of unit circuits includes a driving transistor, a first switching transistor, and a second switching transistor,
By the setting operation, the second switching transistor is turned off, and the driving transistor is supplied via one second signal line of the plurality of second signal lines and the first switching transistor. Set the conduction state according to the data signal
By the reset operation, the second switching transistor is turned on, the first switching transistor is turned off, and the driving transistor is turned off;
A method for driving an electronic device. The method of driving an electronic device according to claim 11.
The second switching transistor controls an electrical connection between a gate and a source or drain of the driving transistor;
A method for driving an electronic device. The method for driving an electronic device according to claim 1,
The plurality of first signal lines are a plurality of scanning lines;
The plurality of second signal lines are a plurality of data lines;
Each of the plurality of unit circuits includes an electro-optic element;
A method for driving an electronic device. The method of driving an electronic device according to claim 13.
The electro-optic element is a light-emitting element;
A method for driving an electronic device.   An electronic device driven by the method for driving an electronic device according to claim 1.   An electronic apparatus comprising the electronic device according to claim 15.

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