CN115810330A - Driving method of pixel circuit and display device - Google Patents
Driving method of pixel circuit and display device Download PDFInfo
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Abstract
The application provides a driving method of a pixel circuit and a display device, wherein the driving method of the pixel circuit comprises the following steps: and in the voltage regulation stage, the voltage of the second scanning signal and/or the light-emitting control signal is controlled to be changed in a step shape so as to reduce the interference of the voltage change on the data signal. In the driving method of the pixel circuit and the display device provided by the application, the voltage regulation stage is arranged between the data writing stage and the light emitting stage, and the voltage of the second scanning signal and/or the light emitting control signal is controlled to change in a step shape, so that the interference of the voltage change on the data signal is reduced, the compensation effect of the threshold voltage is ensured, and the image quality of the display device is improved.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a driving method of a pixel circuit and a display device.
Background
Low Temperature Polysilicon (LTPS) has high mobility and fast response time, and is therefore generally used for preparing an active layer of a thin film transistor, so that a display device including the thin film transistor can be made smaller in size and have higher pixel density, and thus, the Low Temperature polysilicon is widely used in a high-resolution display device.
In practical production application, the thin film transistor prepared by the LTPS technology, namely, the low-temperature polysilicon thin film transistor (LTPS-TFT) has the outstanding advantages of high carrier mobility, small device size and the like, but the inherent characteristics of the thin film transistor, such as threshold voltage (Vth) and the like, have space volatility and can cause non-negligible influence on the picture quality. In order to avoid Vth non-uniformity and Vth Shift (Shift) generated after long-term operation to lower the uniformity of display, it is necessary to compensate for the threshold voltage variation of the driving TFT. For example, a sampling TFT is formed between the gate and drain of the driving TFT, and the diode connection of the driving TFT is realized when the sampling TFT is turned on to perform voltage compensation.
However, as the resolution and refresh frequency of mainstream applications such as display consumer electronics are increased, the signal refresh time is shortened, the pixel area is reduced, and the pixel circuit formed by LTPS-TFT is negatively affected in the working process. The pixel circuit is generally divided into four steps in terms of time sequence: initialization (Reset), compensation (Compensation), data input (Data input), and Emission (Emission). Each row of pixels comprises the steps, and the time for dividing the pixels into each step is continuously shortened along with the continuous improvement of the pixel resolution, so that the compensation effect and the luminous efficiency of the pixels are directly influenced. In particular, the picture quality problem caused by insufficient Vth compensation effect has become a large constraint factor for the development of high resolution and high refresh rate displays.
Disclosure of Invention
In view of the above, the present application provides a driving method of a pixel circuit and a display device to solve the display problem caused by insufficient threshold voltage compensation of the display device in the prior art.
In order to solve the above technical problem, the present invention provides a driving method of a pixel circuit, including: setting the scanning period of the pixel circuit into an initialization stage, a data writing stage, a voltage regulation stage and a light-emitting stage in sequence;
the pixel circuit includes a driving sub-circuit, a data writing sub-circuit, a light emission control sub-circuit, an initialization sub-circuit, and a light emitting element, the light emitting element being connected between a first power supply terminal and a second power supply terminal, an output terminal of the driving sub-circuit being connected to the light emitting element, the data writing sub-circuit being connected to the driving sub-circuit, the data writing sub-circuit being configured to receive a second scan signal and a data signal and write the data signal into the driving sub-circuit under control of the second scan signal, the light emission control sub-circuit being connected to the driving sub-circuit, the light emission control sub-circuit being configured to receive a light emission control signal and transmit a driving current output from the driving sub-circuit to the light emitting element under control of the light emission control signal, the initialization sub-circuit being connected to the driving sub-circuit and the light emitting element, the initialization sub-circuit being configured to receive a first scan signal and an initialization signal and initialize second nodes of the light emitting element and the driving sub-circuit, respectively, with the initialization signal under control of the first scan signal;
in an initialization stage, the first scan signal is at a low level, the second scan signal and the light-emitting control signal are both at a high level, an initialization sub-circuit is turned on, and the initialization signal is used to initialize the light-emitting element and the second node of the driving sub-circuit respectively;
in a data writing stage, the first scanning signal and the light-emitting control signal are both at a high level, the second scanning signal is at a low level, the data writing sub-circuit is switched on, and a data signal is written into a storage capacitor of the driving sub-circuit;
in a voltage regulation stage, controlling the voltage of the second scanning signal and/or the light-emitting control signal to make the second scanning signal and/or the light-emitting control signal in a step-like change so as to reduce the interference of the voltage change on the data signal;
in a light emitting stage, the first scan signal and the second scan signal are both at a high level, and the light emitting control signal is at a low level, so as to turn on the light emitting control sub-circuit, and enable the driving transistor of the driving sub-circuit to output a driving current to drive the light emitting element to emit light.
Optionally, in the driving method of the pixel circuit, in the voltage adjustment stage, the second scan signal is changed from a low level to a high level, and the voltage of the second scan signal has at least two rising steps.
Optionally, in the driving method of the pixel circuit, in the voltage adjustment stage, the voltage of the second scan signal is set to two, three, or four rising steps.
Optionally, in the driving method of the pixel circuit, in the voltage adjustment stage, the light-emitting control signal is changed from a high level to a low level, and the voltage of the light-emitting control signal has at least two descending steps.
Optionally, in the driving method of the pixel circuit, in the voltage adjusting stage, the voltage of the light-emitting control signal is set to two, three, or four falling steps.
Optionally, in the driving method of the pixel circuit, in the voltage adjusting stage, the voltage of the second scan signal is set to two, three, or four rising steps, and then the voltage of the emission control signal is set to two, three, or four falling steps.
Optionally, in the driving method of the pixel circuit, the pixel circuit further includes a compensation sub-circuit, the compensation sub-circuit is connected between the control terminal and the second terminal of the driving transistor, and configured to receive a second scanning signal or a third scanning signal, and compensate the driving circuit under the control of the second scanning signal or the third scanning signal;
the driving method of the pixel circuit further comprises a threshold voltage compensation phase, wherein the threshold voltage compensation phase is arranged between the initialization phase and the voltage regulation phase.
Optionally, in the driving method of the pixel circuit, the threshold voltage compensation phase and the data writing phase are set to be in the same time period.
Correspondingly, the invention also provides a display device which adopts the driving method of the pixel circuit.
Optionally, in the display device, the transistors of the pixel circuit are all low-temperature polysilicon transistors, and the transistors connected to the gate of the driving transistor are all double-gate transistors.
In the driving method of the pixel circuit and the display device provided by the invention, the voltage regulation stage is arranged between the data writing stage and the light emitting stage, and the voltage of the second scanning signal and/or the light emitting control signal is controlled to change in a step shape, so that the interference of the voltage change on the data signal is reduced, the compensation effect of the threshold voltage is ensured, and the image quality of the display device is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a driving timing diagram of a pixel circuit according to a first embodiment of the invention;
fig. 2 is an equivalent circuit diagram of a pixel circuit according to a first embodiment of the invention;
FIG. 3 is a timing diagram of driving the pixel circuit according to the second embodiment of the present invention;
fig. 4 is a driving timing diagram of a pixel circuit according to a third embodiment of the invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
[ EXAMPLES one ]
Please refer to fig. 1, which is a driving timing diagram of a pixel circuit according to a first embodiment of the present invention. As shown in fig. 1, the driving method of the pixel circuit includes: setting the scanning period of the pixel circuit as an initialization stage t1, a data writing stage t2, a voltage regulation stage t3 and a light-emitting stage t4 in sequence; the pixel circuit (not shown in the figure) comprises a driving sub-circuit, a data writing sub-circuit, a light emitting control sub-circuit, an initialization sub-circuit and a light emitting element, the light emitting element is connected between a first power supply terminal and a second power supply terminal, an output terminal of the driving sub-circuit is connected with the light emitting element, the data writing sub-circuit is connected with the driving sub-circuit, the data writing sub-circuit is configured to receive a second scanning signal Sn and a data signal and write the data signal into the driving sub-circuit under the control of the second scanning signal Sn, the light emitting control sub-circuit is connected with the driving sub-circuit, the light emitting control sub-circuit is configured to receive a light emitting control signal En and transmit a driving current output by the driving sub-circuit to the light emitting element under the control of the light emitting control signal En, the initialization sub-circuit is connected with the driving sub-circuit and the light emitting element, the initialization sub-circuit is configured to receive a first scanning signal Sn-1 and an initialization signal Vint and respectively perform node on the light emitting element and the second sub-circuit under the control of the first scanning signal Sn-1; in an initialization stage t1, the first scan signal Sn-1 is at a low level, the second scan signal Sn and the light-emitting control signal En are both at a high level, an initialization sub-circuit is turned on, and an initialization signal Vint is used to initialize the light-emitting element and the second node of the driving sub-circuit, respectively; in a data writing phase t2, when the first scanning signal Sn-1 and the light-emitting control signal En are both at a high level and the second scanning signal Sn is at a low level, the data writing sub-circuit is turned on, and a data signal is written into a storage capacitor of the driving sub-circuit; in a voltage adjusting stage t3, controlling the voltage of the second scan signal Sn and/or the light-emitting control signal En to change in a step shape, so as to reduce interference of voltage change on the data signal; in a light emitting period t4, the first scan signal Sn-1 and the second scan signal Sn are both at a high level, and the light emitting control signal En is at a low level, so as to turn on the light emitting control sub-circuit, so that the driving transistor of the driving sub-circuit outputs a driving current to drive the light emitting element to emit light.
Specifically, the driving method of the pixel circuit is applicable to various pixel circuits, such as 4T2C, 5T1C, 6T1C, 7T1C type circuit structures, and the like. The following description will be given by taking only the 7T1C type circuit configuration as an example.
Fig. 2 is a schematic structural diagram of a pixel circuit according to a first embodiment of the invention. As shown in fig. 2, the pixel circuit of the 7T1C type circuit structure includes 7 transistors (i.e., the first to seventh transistors T1 to T7), 1 storage capacitor Cst, and 1 organic light emitting diode OLED.
The storage capacitor Cst and the second transistor T2 together constitute a driving sub-circuit of the pixel circuit, the storage capacitor Cst is connected between the first power terminal ELVDD and the second node N2, the second transistor T2 serves as a driving transistor and is connected between the first node N1 and the third node N3, and a control terminal thereof is connected to the second node N2.
The DATA writing sub-circuit of the pixel circuit comprises a first transistor T1, wherein a first end of the first transistor T1 is connected with the DATA signal end, a second end of the first transistor T1 is connected with a first node N1, and a control end of the first transistor T1 is connected with a second scanning signal end and is used for responding to the second scanning signal Sn to be conducted so as to transmit the DATA signal DATA to the first node N1.
The light emission control sub-circuit of the pixel circuit includes a fourth transistor T4 and a fifth transistor T5, the fourth transistor T4 is connected between a first power terminal ELVDD and a first node N1, the fifth transistor T5 is connected between a third node N3 and the anode of the organic light emitting diode OLED, and control terminals of the fourth transistor T4 and the fifth transistor T5 are both connected to a light emission control terminal for being turned on in response to the light emission control signal En to transmit the driving current output by the driving transistor to the anode of the organic light emitting diode OLED. The organic light emitting diode OLED is a light emitting element, and emits light with a corresponding luminance according to a driving current flowing therethrough.
The initialization sub-circuit of the pixel circuit includes a sixth transistor T6 and a seventh transistor T7, the sixth transistor T6 is connected between an initialization signal terminal and the second node N2, the seventh transistor T7 is connected between the initialization signal terminal and the anode of the organic light emitting diode OLED, and control terminals of the sixth transistor T6 and the seventh transistor T7 are both connected to the first scan signal terminal, and are configured to be turned on in response to the first scan signal Sn-1 to transmit an initialization signal Vint to the second node N2 and the anode of the organic light emitting diode OLED, respectively.
The compensation sub-circuit of the pixel circuit comprises a third transistor T3, wherein the third transistor T3 is used as a compensation transistor, is connected between the second node N2 and the third node N3, and has a control end connected to the second scan signal end, and is configured to be turned on in response to the second scan signal Sn, so that the second end of the driving transistor is electrically connected to the control end.
In this embodiment, the 7 thin film transistors (i.e., the first transistor T1 to the seventh transistor T7) of the pixel circuit are all P-type thin film transistors, and the P-type thin film transistors are turned on when the control terminal is at a low level and turned off when the control terminal is at a high level.
In this embodiment, the first to seventh transistors T1 to T7 are all low-temperature polysilicon transistors. Preferably, the third transistor T3 and the sixth transistor T6 are dual gate transistors, each of which has a low leakage characteristic, is connected to the gate of the driving transistor T2, and can suppress a potential change of the second node N2 when the driving transistor T2 drives the organic light emitting diode OLED to emit light, thereby preventing a potential change of the second node N2 caused by leakage of the initializing transistor T6 and the compensating transistor T3.
In this embodiment, the pixel circuit is connected to two scan lines (i.e., a first scan line and a second scan line) and respectively receives a first scan signal Sn-1 and a second scan signal Sn, and the compensation transistor (i.e., a third transistor T3) is controlled by the second scan signal.
In other embodiments, the pixel circuit may be connected to three scan lines (i.e., a first scan line, a second scan line, and a third scan line) to receive the first scan signal Sn-1, the second scan signal Sn, and the third scan signal, respectively, and the compensation transistor (i.e., the third transistor T3) may be controlled by the third scan signal.
When the compensation transistor is controlled by the second scan signal Sn, the threshold voltage compensation stage and the data writing stage are set in the same time period, that is, the data writing and the threshold voltage compensation stage are performed simultaneously. When the compensation transistor is controlled by the third scan signal, the threshold voltage compensation phase and the data writing phase may be set at different time periods, i.e., the threshold voltage compensation phase may be set before or after the data writing phase.
With reference to fig. 1, the driving method of the pixel circuit includes an initialization phase t1, a data writing phase t2, a voltage adjusting phase t3, and a light emitting phase t4, which are sequentially arranged.
Specifically, in the initialization stage T1, the first scan signal Sn-1 is at a low level, the second scan signal Sn and the light-emitting control signal En are both at a high level, the sixth transistor T6 and the seventh transistor T7 are turned on, the initialization signal is transmitted to the second node N2 through the sixth transistor T6, and the initialization signal is transmitted to the anode of the organic light-emitting diode OLED through the seventh transistor T7; the gate electrode of the driving transistor T2, the storage capacitor Cst, and the potential of the OLED light emitting device are all initialized accordingly.
At the end of the initialization period T1, the first scan signal Sn-1 changes from a low level to a high level, thereby turning off the sixth transistor T6 and the seventh transistor T7 and stopping initializing the second node N2 and the anode of the organic light emitting diode OLED.
In the DATA writing period T2, the first scan signal Sn-1 and the light emitting control signal En are both at a high level, the second scan signal Sn is at a low level, the first transistor T1 and the third transistor T2 are turned on, the DATA signal DATA provided by the DATA line is transmitted to the first node through the first transistor T1, and the second transistor T2 is short-circuited (the second terminal thereof is electrically connected to the control terminal), thereby extracting the threshold voltage of the second transistor T2.
In the voltage adjusting phase t3, the second scan signal Sn changes from a low level to a high level, and the voltage of the second scan signal Sn is set to at least two rising steps to reduce interference of voltage changes thereof on the DATA signal DATA.
In a light emitting period T4, the first scan signal Sn-1 and the second scan signal Sn are both at a high level, the light emitting control signal En is at a low level, the fourth transistor T4 and the fifth transistor T5 are turned on, and the second transistor T2 is turned on and drives the light emitting diode OLED to emit light.
In this embodiment, a voltage adjusting stage t3 is disposed between the data writing stage t2 and the light emitting stage t4. In the voltage adjusting stage t3, the voltage of the second scan signal Sn changes in a step shape, and changes from a low level to a high level.
In the prior art, the second scan signal Sn usually has only one rising edge when it changes from low level to high level, and the switching voltage of the transistor controlled by the rising edge changes dramatically. In this embodiment, the voltage of the second scan signal Sn is controlled to have at least two rising edges during the transition from the low level to the high level, so that the potential coupling caused by the large voltage change of the Sn signal can be reduced, thereby reducing the interference on the written DATA signal DATA and further reducing the fluctuation of the DATA signal DATA before light emission.
Preferably, the voltage of the second scan signal Sn is set to two, three, or four rising steps during the voltage adjustment period t3.
Correspondingly, the invention also provides a display device which adopts the driving method of the pixel circuit. Please refer to the above, which is not repeated herein.
In this embodiment, the pixel circuit is a low temperature polysilicon thin film transistor (LTPS-TFT), but the driving method of the pixel circuit is more optimized, and the fluctuation of the DATA signal DATA can be reduced before the light emitting diode OLED emits light, so that the compensation effect of the threshold voltage is ensured, and the picture quality is further improved.
[ example two ]
Please refer to fig. 3, which is a timing diagram of the pixel circuit according to a second embodiment of the present invention. As shown in fig. 3, in the driving method of the pixel circuit provided in the embodiment, the scanning period of the pixel circuit is also set to the initialization phase t1, the data writing phase t2, the voltage adjusting phase t3, and the light emitting phase t4 in this order.
The difference between this embodiment and the first embodiment is that, in the voltage adjustment stage t3, the voltage of the second scan signal Sn is not controlled to change in a step shape, but the voltage of the light-emitting control signal En is set to at least two descending steps, so as to reduce the interference caused by the voltage change to the data signal. Meanwhile, the existing second scanning signal Sn is adopted in the driving process, and only one rising edge exists in the process that the Sn signal is converted from low level to high level.
In this embodiment, by controlling the voltage of the light emission control signal En to have at least two falling edges in the process of transitioning from the high level to the low level, it is possible to reduce potential coupling due to a large change in the voltage of the En signal, thereby reducing fluctuation of the DATA signal DATA at the start of light emission.
Preferably, the voltage of the light emission control signal En is set to two, three or four falling steps during the voltage adjusting period t3.
Correspondingly, the invention also provides a display device which adopts the driving method of the pixel circuit. Please refer to the above, which is not described herein.
In this embodiment, the pixel circuit is a low temperature polysilicon thin film transistor (LTPS-TFT). In the driving process of the pixel circuit, since the En signal is optimized, it is possible to reduce the fluctuation of the DATA signal DATA at the time of the start of light emission of the light emitting diode OLED, thereby further improving the picture quality.
[ EXAMPLE III ]
Please refer to fig. 4, which is a timing diagram of the pixel circuit according to a third embodiment of the present invention. As shown in fig. 4, in the driving method of the pixel circuit provided in the embodiment, the scanning period of the pixel circuit is also set to the initialization phase t1, the data writing phase t2, the voltage adjusting phase t3, and the light emitting phase t4 in this order.
The difference between this embodiment and the first embodiment is that, in the voltage adjustment stage t3, the voltage of the second scan signal Sn is set to at least two ascending steps to reduce the interference caused by the voltage change to the DATA signal DATA, specifically, see the portion t3a in the figure, and the voltage of the light-emitting control signal En is set to at least two descending steps to reduce the interference caused by the voltage change to the DATA signal DATA, specifically, see the portion t3b in the figure. In this way, it is possible to reduce the fluctuation of the DATA signal DATA not only before the light emission of the light emitting diode OLED but also at the start of the light emission thereof.
Correspondingly, the invention also provides a display device which adopts the driving method of the pixel circuit. Please refer to the above, which is not described herein.
Compared with the display device provided by the embodiment, the display device provided by the embodiment optimizes the Sn signal and the En signal in the driving process, so that the display quality is better.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The figures described above are only schematic representations of the pixel circuits provided by the present invention. For clarity, the shapes of the elements and the number of the elements in the above-mentioned figures are simplified and some elements are omitted, so that those skilled in the art can make changes according to actual needs, and the changes are within the protection scope of the present invention and will not be described herein.
In summary, the driving method of the pixel circuit and the display device provided by the invention control the voltage of the second scan signal and/or the light-emitting control signal to change in a step shape by setting the voltage adjusting stage between the data writing stage and the light-emitting stage, so as to reduce the interference of the voltage change on the data signal, thereby ensuring the compensation effect of the threshold voltage and improving the image quality of the display device.
The foregoing is a further detailed description of the present application in connection with specific preferred embodiments and it is not intended to limit the present application to the particular forms set forth herein. For those skilled in the art to which the present application pertains, several simple deductions or substitutions can be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. A method of driving a pixel circuit, comprising: setting the scanning period of the pixel circuit into an initialization stage, a data writing stage, a voltage regulation stage and a light-emitting stage in sequence;
the pixel circuit includes a driving sub-circuit, a data writing sub-circuit, a light emission control sub-circuit, an initialization sub-circuit, and a light emitting element, the light emitting element being connected between a first power supply terminal and a second power supply terminal, an output terminal of the driving sub-circuit being connected to the light emitting element, the data writing sub-circuit being connected to the driving sub-circuit, the data writing sub-circuit being configured to receive a second scan signal and a data signal and write the data signal into the driving sub-circuit under control of the second scan signal, the light emission control sub-circuit being connected to the driving sub-circuit, the light emission control sub-circuit being configured to receive a light emission control signal and transmit a driving current output from the driving sub-circuit to the light emitting element under control of the light emission control signal, the initialization sub-circuit being connected to the driving sub-circuit and the light emitting element, the initialization sub-circuit being configured to receive a first scan signal and an initialization signal and initialize second nodes of the light emitting element and the driving sub-circuit, respectively, with the initialization signal under control of the first scan signal;
in an initialization stage, the first scan signal is at a low level, the second scan signal and the light-emitting control signal are both at a high level, an initialization sub-circuit is turned on, and the initialization signal is used to initialize the light-emitting element and the second node of the driving sub-circuit respectively;
in a data writing stage, the first scanning signal and the light-emitting control signal are both at a high level, the second scanning signal is at a low level, the data writing sub-circuit is switched on, and a data signal is written into a storage capacitor of the driving sub-circuit;
in a voltage regulation stage, controlling the voltage of the second scanning signal and/or the light-emitting control signal to make the second scanning signal and/or the light-emitting control signal in a step-like change so as to reduce the interference of the voltage change on the data signal;
in a light emitting period, the first scan signal and the second scan signal are both at a high level, and the light emitting control signal is at a low level, so as to turn on the light emitting control sub-circuit, so that the driving transistor of the driving sub-circuit outputs a driving current to drive the light emitting element to emit light.
2. The method for driving the pixel circuit according to claim 1, wherein the second scan signal is changed from a low level to a high level in a voltage adjustment stage, and the voltage of the second scan signal has at least two rising steps.
3. The driving method of a pixel circuit according to claim 2, wherein the voltage of the second scan signal is set to two, three, or four rising steps in the voltage adjustment phase.
4. The driving method of a pixel circuit according to claim 1, wherein the light emission control signal is changed from a high level to a low level in a voltage adjusting stage, and a voltage of the light emission control signal has at least two falling steps.
5. The driving method of a pixel circuit according to claim 4, wherein the voltage of the emission control signal is set to two, three, or four falling steps in the voltage adjustment phase.
6. The method of driving the pixel circuit according to claim 1, wherein in the voltage adjustment stage, the voltage of the second scan signal is set to two, three, or four rising steps, and then the voltage of the emission control signal is set to two, three, or four falling steps.
7. The driving method of the pixel circuit according to claim 1, wherein the pixel circuit further comprises a compensation sub-circuit connected between the control terminal and the second terminal of the driving transistor and configured to receive a second scan signal or a third scan signal and compensate the driving circuit under the control of the second scan signal or the third scan signal;
the driving method of the pixel circuit further comprises a threshold voltage compensation phase which is arranged between the initialization phase and the voltage regulation phase.
8. The method for driving the pixel circuit according to claim 7, wherein the threshold voltage compensation phase and the data writing phase are set to the same period of time.
9. A display device characterized by employing a driving method of the pixel circuit according to any one of claims 1 to 8.
10. The display device according to claim 9, wherein the transistors of the pixel circuits are all low temperature polysilicon transistors, and the transistors connected to the gates of the driving transistors are all double gate transistors.
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