JP2006251454A - Active matrix type display device and method for driving the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To to enhance a display grade by suppressing an after image phenomenon and in an active matrix type display device. <P>SOLUTION: A storage capacitor line potential switching circuit 101 switches potential of a storage capacitor line 217 from first potential Vsc1 to second potential Vsc2 higher than the first potential Vsc1, and at the same time, a power source potential switching circuit 102 switches potential of a power source line 215 from first power source potential PVdd1 to second power source potential PVdd2 lower than the first power source potential PVdd1. By a synergistic effect of them, gate potential Vg of a TFT 214 for drive becomes higher than threshold Vtp to its source potential. If a positive hole is trapped to a gate insulating film of the TFT 214 for drive by writing of a display signal D in the previous time, the positive hole is extracted from the gate insulating film to a source or a drain. Thus, electronic characteristics of the TFT 214 for drive are initialized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an active matrix display device and a driving method thereof.

  In recent years, organic EL display devices using organic electroluminescent devices (hereinafter referred to as “organic EL devices”) elements have been developed as display devices to replace CRTs and LCDs. In particular, an active matrix organic EL display device having a thin film transistor (hereinafter referred to as “TFT”) as a switching element for driving the organic EL element has been developed.

  Hereinafter, an active matrix organic EL display device will be described with reference to the drawings. FIG. 8 is an equivalent circuit diagram of the organic EL display device. FIG. 8 shows only one display pixel 210 from among a plurality of display pixels arranged in a matrix on the display panel.

  An N-channel pixel selection TFT 213 is disposed in the vicinity of the intersection of the pixel selection signal line 211 extending in the row direction and the display signal line 212 extending in the column direction. The gate of the pixel selection TFT 213 is connected to the pixel selection signal line 211, and the drain thereof is connected to the display signal line 212. A high-level pixel selection signal G output from the vertical drive circuit 301 is applied to the pixel selection signal line 211, and the pixel selection TFT 213 is turned on accordingly. A display signal D is output from the horizontal drive circuit 302 to the display signal line 212.

  The source of the pixel selection TFT 213 is connected to the gate of a P-channel type driving TFT 214. A power supply line 215 that supplies a positive power supply potential PVdd is connected to the source of the driving transistor 214. The drain of the driving transistor 214 is connected to the anode of the organic EL element 216. A negative power supply potential CV is supplied to the cathode of the organic EL element 216.

  A storage capacitor 218 is connected between the gate of the driving TFT 214 and the storage capacitor line 217. The storage capacitor line 217 is fixed at a constant potential. The storage capacitor 218 holds the display signal D applied to the gate of the driving TFT 214 through the pixel selection TFT 213 for one horizontal period.

  Next, the operation of the above-described organic EL display device will be described. When the high-level pixel selection signal G is applied to the pixel selection signal line 211 over one horizontal period, the pixel selection TFT 213 is turned on. Then, the display signal D output from the display signal line 212 is applied to the gate of the driving TFT 214 through the pixel selection TFT 213 and held by the holding capacitor 218. That is, the display signal D is written to the display pixel 210.

  When the conductance of the driving TFT 214 changes according to the display signal D applied to the gate of the driving TFT 214 and the driving transistor 214 is turned on, a current corresponding to the conductance is driven. The organic EL element 216 is supplied to the organic EL element 216 through the TFT 214, and the organic EL element 216 is lit at a luminance corresponding to the organic EL element 216. On the other hand, when the driving TFT 214 is turned off in accordance with the display signal D supplied to the gate, no current flows through the driving TFT 214, so that the organic EL element 216 is turned off.

  A desired image can be displayed on the entire display panel by performing the above-described operation on the display pixels 210 in all rows over one field period.

In addition, the following patent documents are mentioned as technical documents relevant to the present application.
JP 2004-341435 A

  However, in the above-described organic EL display device, an afterimage due to light emission of the organic EL element 216 may be generated in a part of the display panel, which causes a problem that display quality deteriorates. For the same display pixel, depending on the conduction state (on state or off state) of the driving TFT 214 when the display signal D was written last time, the current state of the driving TFT 214 when it was written this time This is because a current having a current value different from that expected in accordance with the display signal D flows. That is, there is a phenomenon that the current flowing through the driving TFT 214 has hysteresis. This phenomenon is particularly prominent when the display signal D is an intermediate level signal between a high level and a low level.

  According to the study by the present inventor, this hysteresis phenomenon is caused by the carrier (hole) flowing in the driving TFT 214 being trapped in the gate insulating film at the time of the previous writing of the display signal D, and the trapped carrier being driven. This is presumably because the threshold value of the TFT 214 for use is changed.

  Therefore, the present invention provides an active matrix type display device that suppresses the afterimage of the display panel as described above and improves display quality.

  The active matrix display device of the present invention includes a plurality of display pixels arranged in a matrix, and each display pixel is connected to a pixel selection transistor that is turned on in response to a pixel selection signal, a light emitting element, and a power supply line. A driving transistor for driving the light emitting element in accordance with a display signal applied through the pixel selection transistor, and a storage capacitor connected between the gate of the driving transistor and the storage capacitor line and holding the display signal, Further, the potential of the storage capacitor line is switched from the first potential to a second potential different from the first potential to turn off the driving transistor, and the potential of the storage capacitor line is changed from the second potential to the first potential. And a storage capacitor line potential switching circuit for switching so as to return to.

  In addition to the above structure, the active matrix display device of the present invention switches the potential of the power supply line from the first power supply potential to a second power supply potential different from the first power supply potential, and again A power supply potential switching circuit is provided for switching the potential to return from the second power supply potential to the first power supply potential.

  The active matrix display device of the present invention includes a plurality of display pixels arranged in a matrix, each display pixel being turned on in response to a pixel selection signal, a light emitting element, and a power line. A driving transistor that drives the light emitting element in response to a display signal applied through the pixel selection transistor, and a storage capacitor that is connected between the gate of the driving transistor and the storage capacitor line and holds the display signal. In addition, the potential of the power supply line is switched from the first power supply potential to a second power supply potential different from the first power supply potential, the driving transistor is turned off, and the potential of the power supply line is changed to the second power supply potential again. A power supply potential switching circuit that switches back from the power supply potential to the first power supply potential is provided.

  According to the above-described configuration, carriers trapped in the gate insulating film of the driving transistor can be extracted to the source or the drain. Therefore, before the display signal is written to the display pixel, the electrical characteristics of the driving transistor (particularly, , Threshold voltage) can be returned to the original state. As a result, a current having an appropriate current value corresponding to the display signal always flows through the driving transistor, and the afterimage phenomenon of the display panel can be suppressed.

  The driving method of the active matrix display device of the present invention includes a plurality of display pixels arranged in a matrix, each display pixel being turned on in response to a pixel selection signal, a light emitting element, A driving transistor that is connected to the power supply line and drives the light emitting element in accordance with a display signal applied through the pixel selection transistor, and is connected between the gate of the driving transistor and the storage capacitor line, and holds the display signal. In a driving method of an active matrix display device including a capacitor, the potential of the storage capacitor line is switched from the first potential to the second potential, the driving transistor is turned off, and the potential of the storage capacitor line is set again. Switching from the second potential back to the first potential, and then the display signal through the pixel selection transistor in accordance with the pixel selection signal And applying to the driving transistor.

  Further, the driving method of the active matrix display device of the present invention is the above driving method, wherein the potential of the power supply line is switched from the first power supply potential to the second power supply potential different from the first power supply potential, and again the power supply The line potential is switched from the second power supply potential back to the first power supply potential.

  The driving method of the active matrix display device of the present invention includes a plurality of display pixels arranged in a matrix, each display pixel being turned on in response to a pixel selection signal, a light emitting element, A driving transistor that is connected to the power supply line and drives the light emitting element in accordance with a display signal applied through the pixel selection transistor, and is connected between the gate of the driving transistor and the storage capacitor line, and holds the display signal. In a driving method of an active matrix display device including a capacitor, the potential of the power supply line is switched from the first power supply potential to the second power supply potential, the driving transistor is turned off, and the potential of the power supply line is set again. Switching from the second power supply potential back to the first power supply potential, and then passing through the pixel selection transistor in accordance with the pixel selection signal And applying a No. 示信 the driver transistor.

  According to the present invention, in an active matrix display device, an afterimage of a display panel can be suppressed and display quality can be improved.

  Next, an active matrix organic EL display device and a driving method thereof according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an equivalent circuit diagram of the organic EL display device according to the present embodiment. In FIG. 1, only one display pixel 210A is shown from among a plurality of display pixels arranged in a matrix on the display panel. In FIG. 1, the same components as those in FIG. 8 are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 1, the organic EL display device includes a storage capacitor line potential switching circuit 101 connected to the storage capacitor line 217 of the display pixel 210A. The storage capacitor line potential switching circuit 101 switches the potential of the storage capacitor line 217 from the first potential Vsc1 to the second potential Vsc2 higher than the first potential Vsc1 to turn off the driving TFT 214, and again. The storage capacitor line 217 is switched so as to return from the second potential Vsc2 to the first potential Vsc1.

  Furthermore, the organic EL display device of the present embodiment preferably has specifications as shown in Table 1. Table 1 shows possible values of the positive power supply potential PVdd, the negative power supply potential CV, the potential Vsig of the display signal D, the first potential Vsc1, and the second potential Vsc2. In Table 1, channel width W, channel length L, carrier mobility μ, and gate capacitance Cox are parameters indicating specifications of the driving TFT 214.

  Tsc1 represents a period in which the potential of the storage capacitor line 217 is the first potential Vsc1, and Tsc2 represents a period in which the potential of the storage capacitor line 217 is the second potential Vsc2. Here, in the period Tsc2 in which the potential of the storage capacitor line 217 is the second potential Vsc2, the potentials in Table 1 are set so that the gate potential Vg of the driving TFT 214 and the threshold Vtp of the TFT satisfy Equation (1). The parameter needs to be set.

  Next, a method for driving the above-described organic EL display device will be described with reference to the drawings. FIG. 2 is a timing diagram illustrating a method for driving the display device according to the present embodiment.

  As shown in FIG. 2, the storage capacitor line potential switching circuit 101 outputs the first potential Vsc1, but at the predetermined timing, the storage capacitor line is switched to the second potential Vsc2 by switching the first potential Vsc1. The potential of 217 is raised to the second potential Vsc2.

  Then, due to the capacitive coupling effect of the storage capacitor 218, the gate potential Vg of the driving TFT 214 rises according to the voltage change ΔV from the first potential Vsc1 to the second potential Vsc2. As a result, the gate potential Vg of the driving TFT 214 becomes higher than the threshold Vtp of the driving TFT 214 with respect to the source potential PVdd, and the driving TFT 214 is turned off. Here, when VsigMIN is the minimum value of the potential of the display signal D, Cs is the capacitance value of the storage capacitor 218, and Cp is the capacitance value of the parasitic capacitance 219 of the wiring connected to the gate of the driving TFT 214, the equation 2 To establish.

  At this time, if carriers (holes) are trapped in the gate insulating film of the driving TFT 214 by the previous writing of the display signal D, the carriers (holes) are caused by an electric field from the gate toward the source or drain. A tunnel current is drawn from the gate insulating film to the source or drain. As a result, the electrical characteristics of the driving TFT 214 are initialized.

  Next, after the electrical characteristics of the driving TFT 214 are initialized, the storage capacitor line potential switching circuit 101 switches the storage capacitor line 217 so as to return the potential of the storage capacitor line 217 from the second potential Vsc2 to the first potential Vsc1. As a result, the gate potential Vg of the driving TFT 214 returns to the original state, and the original display signal D is held in the holding capacitor 218.

  In order to initialize the electrical characteristics of the driving TFT 214, as shown in Table 1, during the period Tsc2 in which the potential of the storage capacitor line 217 is the second potential Vsc2, the potential of the storage capacitor line 217 is first. More than 1/300 of the period Tsc1 during which the potential Vsc1 is 1. At this time, in the organic EL display device having the specifications shown in Table 1, for example, when one frame period is 16.6 ms, the period during which the driving TFT 214 is turned off and the organic EL element 216 is turned off is 5 ms or more. Become.

  Thereafter, a high-level pixel selection signal G is output from the vertical drive circuit 301, and the pixel selection TFT 213 is turned on for one horizontal period in response thereto. During this one horizontal period, the display signal D is output from the horizontal driving circuit 302 to the display signal line 212 of the display pixel 210, and this display signal D is applied to the gate of the driving TFT 214 through the pixel selection TFT 213. At the same time, it is held in the holding capacitor 218. Then, a current corresponding to the display signal D is supplied from the driving TFT 214 to the organic EL element 216, and the organic EL element 216 emits light.

  As described above, according to the present embodiment, before the light emission of the organic EL element 217 corresponding to the display signal D, carriers (holes) in the gate insulating film of the driving TFT 214 are extracted, and the electrical characteristics thereof are initialized. Therefore, the afterimage phenomenon of the display panel can be suppressed and the display quality can be improved.

  Note that in this embodiment, the period Tsc2 in which the potential of the storage capacitor line 217 is the second potential Vsc2 is set to be 1/300 or more of the period Tsc1 in which the first potential Vsc1 is set. This is derived from the relationship between the turn-off ratio (ratio of turn-off time with respect to the light emission time of the organic EL element 216) and the afterimage time shown in the characteristic diagram.

  In this figure, the afterimage time (au) when the extinction ratio is zero (that is, the organic EL element 216 is not extinguished) is 1. Moreover, according to the knowledge based on the experiment by the present inventors, when the afterimage time when the extinction ratio is zero decreases in the range of 0.01 or more, it can be recognized as the afterimage reduction effect of the organic EL element 216. It turns out.

  That is, in the range where the extinction ratio is 1/300 or more, the afterimage time is reduced in the range of 0.01 or more than 1 (when the extinction ratio is zero), and an afterimage suppression effect can be obtained. I understand.

  Next, an active matrix organic EL display device and a driving method thereof according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is an equivalent circuit diagram of the organic EL display device according to this embodiment. In FIG. 4, only one display pixel 210B is shown among the plurality of display pixels arranged in a matrix on the display panel. In FIG. 4, the same components as those in FIGS. 1 and 8 are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 4, in the organic EL display device of this embodiment, unlike the first embodiment, the potential of the storage capacitor line 217 of the display pixel 210B is held at a fixed potential Vsc. The organic EL display device also includes a power supply potential switching circuit 102 connected to the power supply line 215. The power supply potential switching circuit 102 switches the potential of the power supply line 215 from the first power supply potential PVdd1 to the second power supply potential PVdd2 lower than the first power supply potential PVdd1, and turns off the driving TFT 214 again. The potential of the power supply line 215 is switched from the second power supply potential PVdd2 back to the first power supply potential PVdd1.

  Furthermore, the organic EL display device of the present embodiment preferably has specifications as shown in Table 2. In Table 2, each item whose notation is common to Table 1 represents each potential and parameter similar to those in Table 1.

  Tv1 represents a period in which the potential of the power supply line 215 becomes the first power supply potential PVdd1, and Tv2 represents a period in which the potential of the power supply line 215 becomes the second power supply potential PVdd2. Here, it is necessary to set each potential and parameter in Table 2 so that the gate potential Vg of the driving TFT 214 and the threshold value Vtp of the TFT satisfy the equation (3).

  Next, a method for driving the above-described organic EL display device will be described with reference to the drawings. FIG. 5 is a timing diagram illustrating a method for driving the display device according to the present embodiment.

  As shown in FIG. 5, the power supply line potential switching circuit 102 outputs the first power supply potential PVdd1, but at a predetermined timing, the first power supply potential PVdd1 is switched to the second power supply potential PVdd2, The potential of the power supply line 215 is lowered to the second power supply potential PVdd2.

  Accordingly, the gate potential Vg of the driving TFT 214 becomes higher than the threshold Vtp of the driving TFT 214 with respect to the source potential PVdd2, and the driving TFT 214 is turned off. That is, Formula 4 is established.

  At this time, if carriers (holes) are trapped in the gate insulating film of the driving TFT 214 by the previous writing of the display signal D, the carriers (holes) are caused by an electric field from the gate toward the source or drain. A tunnel current is drawn from the gate insulating film to the source or drain. As a result, the electrical characteristics of the driving TFT 214 are initialized.

  Next, after the electrical characteristics of the driving TFT 214 are initialized, the power supply potential switching circuit 102 switches the power supply line 215 so that the potential of the power supply line 215 is returned from the second power supply potential PVdd2 to the first power supply potential PVdd1. As a result, the gate potential Vg of the driving TFT 214 returns to the original state, and the original display signal D is held in the holding capacitor 218. As in the first and second embodiments, a current corresponding to the display signal D is supplied from the driving TFT 214 to the organic EL element 216, and the organic EL element 216 emits light.

  As shown in Table 2, in order to initialize the electrical characteristics of the driving TFT 214, the potential of the power supply line 215 is the first potential during the period Tv2 in which the potential of the power supply line 215 becomes the second power supply potential PVdd2. 1/300 or more of the period Tv1 during which the power supply potential PVdd1 is set (based on FIG. 3 as in the first embodiment). At this time, in the organic EL display device having the specifications shown in Table 1, for example, when one frame period is 16.6 ms, the period during which the driving TFT 214 is turned off and the organic EL element 216 is turned off is 5 ms or more. Become.

  Thus, according to the present embodiment, as in the first embodiment, before the light emission of the organic EL element 217 according to the display signal D, carriers (holes) in the gate insulating film of the driving TFT 214 are obtained. Since the electrical characteristics are initialized, the afterimage phenomenon of the display panel can be suppressed and the display quality can be improved.

  Note that the present invention can also be applied to the case where the first and second embodiments described above are implemented simultaneously. Next, an active matrix organic EL display device and a driving method thereof according to the third embodiment of the present invention will be described with reference to the drawings.

  FIG. 6 is an equivalent circuit diagram of the organic EL display device according to the present embodiment. In FIG. 6, only one display pixel 210C is shown among the plurality of display pixels arranged in a matrix on the display panel. In FIG. 6, the same components as those in FIGS. 1, 4, and 8 are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 6, the organic EL display device includes a storage capacitor line potential switching circuit 101 connected to the storage capacitor line 217 of the display pixel 210 </ b> C, and a power supply potential switching circuit 102 connected to the power supply line 215. ing. The storage capacitor line potential switching circuit 101 and the power supply potential switching circuit 102 are potential switching circuits similar to those shown in the first and second embodiments.

  Furthermore, the organic EL display device of the present embodiment preferably has specifications as shown in Table 3. In Table 3, each item whose notation is common to Table 1 and Table 2 represents the same potential and parameter as in Table 1 and Table 2.

  Next, a method for driving the above-described organic EL display device will be described with reference to the drawings. FIG. 7 is a timing diagram illustrating a method for driving the display device according to the present embodiment.

  As shown in FIG. 7A, the storage capacitor line potential switching circuit 101 switches the potential of the storage capacitor line 217 from the first potential Vsc1 to the second potential Vsc2, and at the same time, the power supply potential switching circuit 102 is switched to the power supply line 215. Is switched from the first power supply potential PVdd1 to the second power supply potential PVdd2.

  Then, the gate potential Vg of the driving TFT 214 rises according to the voltage change ΔV from the first potential Vsc1 to the second potential Vsc2, and at the same time, the source potential of the driving TFT 214 falls to PVdd2. Due to these synergistic effects, the gate potential Vg of the driving TFT 214 becomes higher than the threshold Vtp of the driving TFT 214 with respect to the source potential PVdd2, and the driving TFT 214 is turned off. That is, Formula 5 is established.

  At this time, if carriers (holes) are trapped in the gate insulating film of the driving TFT 214 by the previous writing of the display signal D, the carriers (holes) are caused by an electric field from the gate toward the source or drain. A tunnel current is drawn from the gate insulating film to the source or drain. As a result, the electrical characteristics of the driving TFT 214 are initialized.

  Next, after the electrical characteristics of the driving TFT 214 are initialized, the storage capacitor line potential switching circuit 101 simultaneously switches the storage capacitor line 217 so that the potential of the storage capacitor line 217 is returned from the second potential Vsc2 to the first potential Vsc1. The power supply potential switching circuit 102 switches the potential of the power supply line 215 so as to return from the second power supply potential PVdd2 to the first power supply potential PVdd1. As a result, the gate potential Vg of the driving TFT 214 returns to the original state, and the original display signal D is held in the holding capacitor 218. As in the first and second embodiments, a current corresponding to the display signal D is supplied from the driving TFT 214 to the organic EL element 216, and the organic EL element 216 emits light.

  Here, in order to initialize the electrical characteristics of the driving TFT 214, as in the first embodiment, the period Tsc2 in which the potential of the storage capacitor line 217 is the second potential Vsc2 is set in the storage capacitor line 217. The potential is set to 1/300 or more of the period Tsc1 during which the potential is the first potential Vsc1 (based on FIG. 3 as in the first embodiment). At this time, in the organic EL display device having the specifications shown in Table 3, for example, when one frame period is 16.6 ms, the period during which the driving TFT 214 is turned off and the organic EL element 216 is turned off is 5 ms or more. Become.

  Note that the timing at which the potential of the storage capacitor line 217 and the potential of the power supply line 215 are switched does not necessarily match. That is, as shown in FIG. 7B, during the period when the potential of the storage capacitor line 217 is the first potential Vsc1 (or the second potential Vsc2), the potential of the power supply line 215 is the first power supply potential PVdd1 ( Alternatively, the period of the second power supply potential Vc2) may be shifted so as to partially overlap as long as they are synchronized with each other. Alternatively, as shown in FIG. 7C, the two periods may be shifted so as not to overlap each other as long as they are synchronized with each other. However, when the driving method shown in FIG. 7C is performed, the organic EL display device is not limited to the specifications shown in Table 3.

  As described above, according to the present embodiment, both the potential of the storage capacitor line 217 and the potential of the power supply line 215 are switched, and the gate potential of the driving TFT 214 is raised higher than the source potential. Carriers (holes) in the insulating film are extracted. As a result, the gate potential of the driving TFT 214 becomes higher than that in the first and second embodiments, so that the electrical characteristics of the driving TFT 214 are initialized as compared with the first and second embodiments. This can be performed more reliably.

  In the first to third embodiments described above, the organic EL element 216 is used as the light emitting element. Instead, a light emitting element other than the organic EL element, for example, an inorganic EL element or a light emitting diode is used. Also good.

  In the first to third embodiments described above, the pixel selection TFT 213 is an N-channel TFT, for example, and the driving TFT 214 is a P-channel TFT, for example. It may be a mold. When the driving TFT 214 is an N-channel TFT, the second potential Vsc2 is set lower than the first potential Vsc1 contrary to the above embodiment. The second power supply potential PVdd2 is set lower than the first power supply potential PVdd1.

1 is an equivalent circuit diagram of an organic EL display device according to a first embodiment of the present invention. FIG. 3 is a timing diagram illustrating a method for driving the organic EL display device according to the first embodiment of the present invention. It is a characteristic view which shows the relationship between the afterimage time of an organic EL element, and a light extinction ratio. It is an equivalent circuit diagram of the organic EL display device according to the second embodiment of the present invention. It is a timing diagram explaining the drive method of the organic electroluminescence display which concerns on the 2nd Embodiment of this invention. FIG. 6 is an equivalent circuit diagram of an organic EL display device according to a third embodiment of the present invention. It is a timing diagram explaining the drive method of the organic electroluminescence display which concerns on the 3rd Embodiment of this invention. It is an equivalent circuit diagram of an organic EL display device according to a conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Retention capacity line switching circuit 102 Power supply potential switching circuit 210, 210A, 210B, 210C Display pixel 211 Pixel selection signal line 212 Display signal line 213 Pixel selection TFT 214 Driving TFT
215 Power line 216 Organic EL element 217 Retention capacitance line 218 Retention capacitance 219 Parasitic capacitance 301 Vertical drive circuit 302 Horizontal drive circuit

Claims (17)

A plurality of display pixels arranged in a matrix;
Each display pixel is connected to a pixel selection transistor that is turned on in response to a pixel selection signal, a light emitting element, and a power supply line, and is used for driving the light emitting element in response to a display signal applied through the pixel selection transistor. A transistor, and a storage capacitor connected between the gate of the driving transistor and a storage capacitor line and holding the display signal;
Further, the potential of the storage capacitor line is switched from the first potential to a second potential different from the first potential to turn off the driving transistor, and the potential of the storage capacitor line is changed from the second potential to the second potential. An active matrix display device comprising a storage capacitor line potential switching circuit for switching back to a potential of 1. The active matrix display device according to claim 1, wherein the second potential of the storage capacitor line is higher than the first potential. The potential of the power supply line is switched from the first power supply potential to a second power supply potential different from the first power supply potential, and the potential of the power supply line is changed from the second power supply potential to the first power supply potential again. 3. The active matrix display device according to claim 1, further comprising a power supply potential switching circuit for switching back. 4. The active matrix display device according to claim 3, wherein the second power supply potential of the power supply line is lower than the first power supply potential. A plurality of display pixels arranged in a matrix;
Each display pixel is connected to a pixel selection transistor that is turned on in response to a pixel selection signal, a light emitting element, and a power supply line, and is used for driving the light emitting element in response to a display signal applied through the pixel selection transistor. A transistor, and a storage capacitor connected between the gate of the driving transistor and a storage capacitor line and holding the display signal;
Further, the potential of the power supply line is switched from the first power supply potential to a second power supply potential different from the first power supply potential to turn off the driving transistor, and the potential of the power supply line is changed to the second power supply potential again. An active matrix display device comprising: a power supply potential switching circuit that switches back from the power supply potential to the first power supply potential. 6. The active matrix display device according to claim 5, wherein the second power supply potential of the power supply line is lower than the first potential. The active matrix display device according to claim 1, wherein the light emitting element is an organic electroluminescence element. A plurality of display pixels arranged in a matrix;
Each display pixel is connected to a pixel selection transistor that is turned on in response to a pixel selection signal, a light emitting element, and a power supply line, and is used for driving the light emitting element in response to a display signal applied through the pixel selection transistor. In a driving method of an active matrix display device including a transistor, a storage capacitor connected between a gate of the driving transistor and a storage capacitor line and holding the display signal,
The potential of the storage capacitor line is switched from the first potential to the second potential to turn off the driving transistor, and the potential of the storage capacitor line is changed from the second potential to the first potential again. Switch back to
Thereafter, the display signal is applied to the driving transistor through the pixel selection transistor in accordance with the pixel selection signal. 9. The method of driving an active matrix display device according to claim 8, wherein the second potential of the storage capacitor line is higher than the first potential. The period in which the potential of the storage capacitor line is the second potential is 1/300 or more of the period in which the potential of the storage capacitor line is the first potential. A driving method of an active matrix display device. The potential of the power supply line is switched from the first power supply potential to a second power supply potential different from the first power supply potential, and the potential of the power supply line is returned from the second power supply potential to the first power supply potential again. 11. The method of driving an active matrix display device according to claim 8, wherein switching is performed as described above. 12. The method of driving an active matrix display device according to claim 11, wherein the second power supply potential of the power supply line is lower than the first power supply potential. 13. The period when the potential of the power supply line becomes the second power supply potential is 1/300 or more of the period when the potential of the power supply line becomes the first power supply potential. A driving method of an active matrix display device. A plurality of display pixels arranged in a matrix;
Each display pixel is connected to a pixel selection transistor that is turned on in response to a pixel selection signal, a light emitting element, and a power supply line, and is used for driving the light emitting element in response to a display signal applied through the pixel selection transistor. In a driving method of an active matrix display device including a transistor, a storage capacitor connected between a gate of the driving transistor and a storage capacitor line and holding the display signal,
The potential of the power supply line is switched from the first power supply potential to the second power supply potential to turn off the driving transistor, and the potential of the power supply line is changed from the second power supply potential to the first power supply again. Switch back to potential,
Thereafter, the display signal is applied to the driving transistor through the pixel selection transistor in accordance with the pixel selection signal. 15. The method of driving an active matrix display device according to claim 14, wherein the second power supply potential of the power supply line is lower than the first power supply potential. 16. The period during which the potential of the power supply line is the second power supply potential is 1/300 or more of the period during which the potential of the power supply line is the first power supply potential. A driving method of the active matrix display device according to the above. The method of driving an active matrix display device according to any one of claims 8, 9, 10, 11, 12, 13, 14, 15, and 16, wherein the light emitting element is an organic electroluminescence element.

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