CN212724668U - Pixel circuit and display device - Google Patents
Pixel circuit and display device Download PDFInfo
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- CN212724668U CN212724668U CN202021399676.XU CN202021399676U CN212724668U CN 212724668 U CN212724668 U CN 212724668U CN 202021399676 U CN202021399676 U CN 202021399676U CN 212724668 U CN212724668 U CN 212724668U
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Abstract
The application provides a pixel circuit, a driving method thereof and a display device, wherein a leakage-proof transistor is additionally arranged between a grid electrode of a driving transistor and an initialization transistor and between the grid electrode of the driving transistor and a compensation transistor, the leakage-proof transistor comprises an active layer with an oxide semiconductor, the potential change of the grid electrode of the driving transistor in the light emitting process of a light emitting diode is restrained by utilizing the low leakage characteristic of a metal oxide transistor, the leakage of the initialization transistor and the compensation transistor is prevented, and the low-frequency display and the power consumption are reduced.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a pixel circuit and a display device.
Background
As shown in fig. 1, which is an equivalent circuit diagram of a pixel circuit of a conventional single pixel. The pixel circuit of a single pixel includes a driving transistor T1, a switching transistor T2, a compensation transistor T3, an initialization transistor T4, a first light emission control transistor T5, a second light emission control transistor T6, a reset transistor T7, a storage capacitor C, and an organic light emitting diode OLED. A control terminal of the driving transistor T1 is connected to the first terminal of the storage capacitor C, the first terminal of the compensating transistor T3, and the first terminal of the initializing transistor T4, a first terminal of the driving transistor T1 is connected to the first power voltage terminal ELVDD through the first light emission controlling transistor T5, and a second terminal of the driving transistor T1 is connected to the anode electrode of the organic light emitting diode OLED through the second light emission controlling transistor T6. The first terminal of the switching transistor T2 is connected to the Data signal terminal Data, the second terminal of the switching transistor T2 is connected to the first terminal of the driving transistor T1, the control terminal of the switching transistor T2 is connected to the nth scan signal terminal scan (n), and n is an integer greater than or equal to 2. A control terminal of the compensation transistor T3 is connected to the nth scan signal terminal scan (n), a first terminal of the compensation transistor T3 is connected to the control terminal of the driving transistor T1, and a second terminal of the compensation transistor T3 is connected to the second terminal of the driving transistor T1. The control terminal of the initialization transistor T4 is connected to the (n-1) th Scan driving signal terminal Scan (n-1), the first terminal of the initialization transistor T4 is connected to the control terminal of the driving transistor T1, and the second terminal of the initialization transistor T4 is connected to the initialization signal terminal Vint. A control terminal of the first light emission controlling transistor T5 and a control terminal of the second light emission controlling transistor T6 are both connected to the light emission control signal terminal EM. The control terminal of the reset transistor T7 is connected to the nth scan signal terminal scan (n), the first terminal of the reset transistor T7 is connected to the anode of the organic light emitting diode OLED, and the second terminal of the reset transistor T7 is connected to the initialization signal terminal Vint. The cathode of the organic light emitting diode OLED is connected to the second power voltage terminal ELVSS. The driving transistor T1, the switching transistor T2, the compensating transistor T3, the initializing transistor T4, the first light-emitting control transistor T5, the second light-emitting control transistor T6 and the reset transistor T7 are all P-type thin film transistors having a low-temperature polysilicon active layer, and the low-temperature polysilicon thin film transistor has a fatal weak point that a leakage current is large, although the compensating transistor T3 and the initializing transistor T4 are double-gate transistors, the double-gate transistor has a smaller leakage current than a common single transistor. However, when the driving transistor T1 drives the organic light emitting diode, when the compensation transistor T3 and the initialization transistor T4 are both dual-gate transistors turned off, a leakage current still flows through the compensation transistor T3 and the initialization transistor T4, which causes a change in the gate voltage of the driving transistor T1, and especially, the leakage current causes a serious flicker problem in low frequency display.
Therefore, it is necessary to provide a solution to the problem that the gate voltage of the driving transistor T1 is changed due to the drain current when the compensation transistor T3 and the initialization transistor T4 are turned off, which is not favorable for realizing the low frequency display.
Disclosure of Invention
The present application provides a pixel circuit, a driving method thereof, and a display device, so as to solve the problem that the gate voltage of the driving transistor is changed due to the drain conductance when the compensation transistor and the initialization transistor are turned off, which is not favorable for realizing low frequency display.
To achieve the above object, the present application provides a pixel circuit including:
a light emitting diode;
the first end of the driving transistor is electrically connected with the light emitting diode, and the control end of the driving transistor is connected with the first node and used for controlling the working state of the light emitting diode according to the potential of the first node;
a leakage prevention transistor having a first terminal connected to the first node and a second terminal connected to the second node, the leakage prevention transistor including an active layer having an oxide semiconductor and being in an off state when the light emitting diode is in a light emitting state;
the first end of the initialization transistor is connected with the second node, and the second end of the initialization transistor is connected with an initialization signal line and used for transmitting an initialization signal input by the initialization signal line to the first node; and the number of the first and second groups,
and a compensation transistor, a first end of the compensation transistor being connected to the first end of the driving transistor, and a second end of the compensation transistor being connected to the second node, for electrically connecting the first end of the driving transistor and the control end of the driving transistor.
In the above pixel circuit, the pixel circuit further includes a reset transistor, a first end of the reset transistor is connected to the second node, and a second end of the reset transistor is connected to the initialization signal line, and is configured to be turned on according to a first control signal when the light emitting diode is in a light emitting state, and transmit a fixed reference voltage input by the initialization signal line to the second node.
In the above pixel circuit, the reset transistor includes an active layer having low temperature polysilicon.
In the pixel circuit, the anti-leakage transistor is used for being in an off state according to the first control signal when the light emitting diode is in a light emitting state,
the anti-creeping transistor is an N-type transistor, and the reset transistor is a P-type transistor.
In the pixel circuit, the anti-leakage transistor is used for being in a closed state according to a second control signal when the light-emitting diode is in a light-emitting state;
the initialization transistor is used for transmitting an initialization signal input by the initialization signal line to the first node according to a third control signal;
the compensation transistor is used for enabling the first end of the driving transistor and the control end of the driving transistor to be electrically connected according to a fourth control signal,
the first control signal, the second control signal, the third control signal, and the fourth control signal are different from each other.
In the above pixel circuit, the pixel circuit further includes a reset transistor, a first end of the reset transistor is connected to the anode of the light emitting diode, and a second end of the reset transistor is connected to the first end of the initialization transistor and the second node, and configured to transmit the initialization signal to the anode of the light emitting diode according to a third control signal;
the initialization transistor is configured to transmit the initialization signal to the second terminal of the reset transistor and the first node according to the third control signal.
In the above pixel circuit, the pixel circuit further includes a reset transistor, a first end of the reset transistor is connected to the anode of the light emitting diode, and a second end of the reset transistor is connected to the initialization signal line, and is configured to transmit a reset signal input by the initialization signal line to the anode of the light emitting diode according to a fourth control signal;
the compensation transistor is used for enabling the first end of the driving transistor and the control end of the driving transistor to be electrically connected according to the fourth control signal.
In the above pixel circuit, the pixel circuit further includes:
a first end of the switching transistor is connected with the second end of the driving transistor, and a second end of the switching transistor is connected with a data signal line and used for transmitting a data signal input by the data signal line to the second end of the driving transistor according to a fourth control signal;
a first end of the first light-emitting control transistor is connected with the second end of the driving transistor, the second end of the first light-emitting control transistor is connected with a power supply voltage signal line, and a control end of the first light-emitting control transistor is connected with a light-emitting control signal line and used for transmitting the power supply voltage input by the power supply voltage signal line to the second end of the driving transistor according to a light-emitting control signal input by the light-emitting control signal line;
a first end of the second light-emitting control transistor is connected with the first end of the driving transistor, a second end of the second light-emitting control transistor is connected with an anode of the light-emitting diode, and a control end of the second light-emitting control transistor is connected with the light-emitting control signal line and used for transmitting the driving current output by the driving transistor to the light-emitting diode according to the light-emitting control signal;
a storage capacitor having a first terminal connected to a first node and a second terminal connected to the supply voltage signal line.
In the above pixel circuit, the driving transistor, the switching transistor, the compensation transistor, the initialization transistor, the first light emission control transistor, and the second light emission control transistor are all P-type transistors having a polysilicon active layer.
A method for driving the pixel circuit, the method comprising:
in an initialization stage, the anti-creeping transistor is turned on, the initialization transistor is turned on and transmits an initialization signal to the first node;
in the threshold voltage compensation and data writing stage, the anti-leakage transistor is conducted, the compensation transistor is conducted, and the first end of the driving transistor is electrically connected with the control end of the driving transistor;
in the light emitting stage, the anti-creeping transistor, the compensation transistor and the initialization transistor are all closed, and the driving transistor is switched on and controls the light emitting diode to be in a light emitting state.
A display device, the display device comprising:
a light emitting diode;
a driving transistor for transmitting a driving current to the light emitting diode;
the initialization transistor is used for transmitting an initialization signal to the control end of the driving transistor;
a compensation transistor for transmitting a data signal having a compensated threshold voltage to a control terminal of the driving transistor; and
and an anti-leakage transistor connected between the control terminal of the driving transistor and the initialization transistor and between the control terminal of the driving transistor and the compensation transistor, the anti-leakage transistor including an active layer having an oxide semiconductor.
In the above display device, the leakage preventing transistor includes a first terminal connected to the control terminal of the driving transistor and a second terminal connected to the initialization transistor and the compensation transistor,
the display device further comprises a reset transistor, wherein the reset transistor is connected with the second end of the anti-leakage transistor and used for being conducted according to a first control signal and transmitting a fixed reference voltage signal to the second end of the anti-leakage transistor.
In the above display device, the anticreeping transistor is used for being in an off state according to the first control signal,
the anti-creeping transistor is an N-type transistor, and the reset transistor is a P-type transistor.
In the above display device, the control terminal of the reset transistor is connected to a light emission control signal line, and the first control signal is a light emission control signal input by the light emission control signal line.
In the above display device, the reset transistor includes an active layer having low temperature polysilicon.
In the above display device, the anti-leakage transistor is used for being in a turn-off state according to a second control signal when the light emitting diode is in a light emitting state;
the initialization transistor is used for transmitting an initialization signal to the control end of the driving transistor according to a third control signal;
the compensation transistor is used for transmitting a data signal with a compensated threshold voltage to the control end of the driving transistor according to a fourth control signal,
the first control signal, the second control signal, the third control signal, and the fourth control signal are different from each other.
In the above display device, the pixel circuit further includes a reset transistor, a first end of the reset transistor is connected to the anode of the light emitting diode, a second end of the reset transistor is connected to the first end of the initialization transistor, and a control end of the reset transistor is configured to receive a third control signal;
the first end of the initialization transistor is connected with the second end of the reset transistor, the control end of the initialization transistor is used for receiving the third control signal, and the second end of the initialization transistor is used for receiving an initialization signal.
In the above display device, the pixel circuit further includes a reset transistor, a first end of the reset transistor is connected to an anode of the light emitting diode, a second end of the reset transistor is connected to the initialization signal line, a control end of the reset transistor is configured to receive the fourth control signal, and a control end of the initialization transistor is configured to receive the third control signal.
In the above display device, the display device further includes:
a switching transistor, the switching transistor being connected to the driving transistor, a second terminal of the switching transistor being connected to a data signal line, a control terminal of the switching transistor being configured to receive a fourth control signal,
the first light-emitting control transistor is connected between the driving transistor and the power supply voltage signal line, and the control end of the first light-emitting control transistor is connected with the light-emitting control signal line;
the second light-emitting control transistor is connected between the driving transistor and the anode of the light-emitting diode, and the control end of the second light-emitting control transistor is connected with the light-emitting control signal line;
and a storage capacitor connected between a power supply voltage signal line and the control terminal of the driving transistor.
In the above display device, the switching transistor, the compensation transistor, the initialization transistor, the first light emission control transistor, and the second light emission control transistor are all P-type transistors having a polysilicon active layer.
Has the advantages that: the application provides a pixel circuit, a driving method thereof and a display device, wherein an anti-leakage transistor is additionally arranged between a grid electrode of a driving transistor and an initialization transistor and between the grid electrode of the driving transistor and a compensation transistor, the anti-leakage transistor comprises an active layer with an oxide semiconductor, the low-leakage characteristic of the metal oxide transistor is utilized to restrain the potential change of the grid electrode of the driving transistor in the light emitting process of a light emitting diode, and the low-frequency display and the power consumption are favorably reduced.
Drawings
Fig. 1 is an equivalent circuit diagram of a pixel circuit of a conventional single pixel;
FIG. 2 is an equivalent circuit diagram of a pixel circuit of a single pixel according to the first embodiment of the present application;
FIG. 3 is a driving timing diagram corresponding to the equivalent circuit diagram shown in FIG. 2;
FIG. 4 is an equivalent circuit diagram of a pixel circuit of a single pixel according to a second embodiment of the present application;
FIG. 5 is an equivalent circuit diagram of a pixel circuit of a single pixel according to a third embodiment of the present application;
fig. 6 is an equivalent circuit diagram of a pixel circuit of a single pixel according to a fourth embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides a display device. The display device is an organic light emitting diode display device. The display device includes a data driver and an organic light emitting diode display panel. The organic light emitting diode display panel comprises a display area and a frame area positioned at the periphery of the display area.
The display area of the organic light emitting diode display panel is provided with a plurality of pixel circuits, a plurality of scanning signal lines, a plurality of data lines, a plurality of initialization signal lines, a plurality of light emitting control signal lines and a plurality of power signal lines. The frame area of the organic light emitting diode display panel is arranged on a grid driving circuit, the grid driving circuit is used for outputting scanning signals, and the grid driving circuit is connected with scanning signal lines so as to output the scanning signals to the scanning signal lines. The data driver is used for outputting data signals, the data driver is connected with the data lines to output the data signals to the data lines, and the driving circuit used for outputting the light-emitting control signals is also arranged in a frame area of the organic light-emitting diode display panel.
The initialization signal line is used for transmitting signals such as an initialization signal. The light emission control signal line is used for transmitting a light emission control signal. The power signal line comprises a first power voltage signal line and a second power voltage signal line, wherein the first power voltage signal line is used for transmitting a first power voltage signal, and the second power voltage signal line is used for transmitting a second power voltage signal.
Each pixel circuit is used for driving one sub-pixel to emit light. Each sub-pixel is an organic light emitting diode. Each pixel circuit is connected to a data line, a scanning signal line, an initialization signal line, a power supply signal line, and a light emission control signal line.
In the present embodiment, each pixel circuit includes a light emitting diode, a driving transistor, a switching transistor, a compensation transistor, an initialization transistor, a first light emission control transistor, a second light emission control transistor, an anti-leakage transistor, a reset transistor, and a storage capacitor. Any one of the driving transistor, the switching transistor, the compensation transistor, the initialization transistor, the first light-emitting control transistor, the second light-emitting control transistor, the anti-leakage transistor and the reset transistor comprises a first end, a second end and a control end, wherein the first end is one of a source electrode or a drain electrode, the second end is the other of the source electrode or the drain electrode, and the control end is a grid electrode. The driving transistor, the switching transistor, the compensation transistor, the initialization transistor, the first light emitting control transistor, the second light emitting control transistor and the reset transistor are all P-type transistors with low-temperature polysilicon active layers. The anticreeping transistor is an N-type transistor with an oxide semiconductor active layer. Compared with the polycrystalline silicon transistor with larger leakage current in the off state, the oxide semiconductor transistor has low leakage current characteristic in the off state.
The light emitting diode is an organic light emitting diode and comprises an anode, a cathode and an organic light emitting layer positioned between the cathode and the anode. The cathode of the light emitting diode is connected with a second power voltage signal line.
The first end of the switch transistor is connected with the driving transistor, the second end of the switch transistor is connected with the data signal line, the control end of the switch transistor is used for receiving a fourth control signal, and the switch transistor is used for transmitting the data signal input by the data signal line to the driving transistor according to the fourth control signal. The fourth control signal is output by the second scanning line, and the control end of the switching transistor is connected with the second scanning signal line.
The driving transistor is used for transmitting driving current to the light emitting diode so as to enable the light emitting diode to emit light. The control end of the driving transistor is connected with the first end of the storage capacitor and the first end of the anti-leakage transistor, the first end of the driving transistor is connected with the anode of the light-emitting diode through the second light-emitting control transistor, and the second end of the driving transistor is connected with the first power supply voltage signal line through the first light-emitting control transistor.
And the compensation transistor is used for transmitting the data signal with the compensated threshold voltage to the control end of the driving transistor. Specifically, a first end of the compensation transistor is connected to a first end of the driving transistor, a second end of the compensation transistor is connected to a second end of the anti-leakage transistor, a control end of the compensation transistor is connected to the second scanning signal line, and the compensation transistor is configured to connect the control end of the driving transistor and the first end of the driving transistor according to a fourth control signal input by the second scanning signal line.
And an anti-leakage transistor connected between the control terminal of the driving transistor and the initialization transistor and between the control terminal of the driving transistor and the compensation transistor, the anti-leakage transistor including an active layer having an oxide semiconductor. When the light emitting diode is in a light emitting state, the anti-leakage transistor is in a closed state, the anti-leakage transistor has a low leakage current due to the fact that the anti-leakage transistor is provided with the oxide semiconductor active layer, the electric leakage of the electric potential of the control end of the driving transistor through the anti-leakage transistor in the closed state is avoided, the electric potential of the control end of the driving transistor is maintained for one frame time through the storage capacitor, and the low-frequency display and the power consumption reduction are facilitated.
Specifically, the leakage preventing transistor includes a first terminal connected to the control terminal of the driving transistor and a second terminal connected to the initialization transistor and the compensation transistor. The anti-leakage transistor can be used for enabling the light emitting diode to be in a closed state according to a second control signal when the light emitting diode is in a light emitting state, the second control signal is output by the third scanning line, and a control end of the anti-leakage transistor can be connected with the third scanning signal line. The anticreeping transistor may also be configured to be in an off state according to the first control signal, i.e. the same as the control signal of the reset transistor.
The reset transistor is connected with the second end of the anti-leakage transistor and used for conducting according to the first control signal and transmitting the fixed reference voltage signal to the second end of the anti-leakage transistor so as to improve the floating state of the second end of the anti-leakage transistor when the light-emitting diode is in a light-emitting state.
Specifically, the control terminal of the reset transistor is connected to the light emission control signal line, and the first control signal is a light emission control signal input by the light emission control signal line to avoid introducing other signal lines. The reset transistor includes an active layer having low temperature polysilicon and is a P-type transistor.
In this embodiment, a first terminal of the reset transistor is connected to an anode of the light emitting diode, a second terminal of the reset transistor is connected to a first terminal of the initialization transistor, a control terminal of the reset transistor is configured to receive a third control signal, and the reset transistor is configured to reset the anode of the light emitting diode according to the third control signal; the first end of the initialization transistor is connected with the second end of the anti-leakage transistor and the second end of the reset transistor, the second end of the initialization transistor is used for receiving an initialization signal, the control end of the initialization transistor is used for receiving a third control signal, the initialization transistor is used for transmitting the initialization signal to the control end of the driving transistor according to the third control signal, so that the control end of the driving transistor is initialized, and the anode of the light emitting diode is reset and the control end of the driving transistor is initialized at the same time. The third control signal is output by the first scan line, and the control end of the reset transistor and the control end of the initialization transistor are connected with the first scan line.
In other embodiments, a first terminal of the reset transistor is connected to the anode of the light emitting diode, a second terminal of the reset transistor is connected to the initialization signal line, a control terminal of the reset transistor is configured to receive a fourth control signal, and the reset transistor is configured to reset the anode of the light emitting diode according to the fourth control signal; the first end of the initialization transistor is connected with the second end of the anti-leakage transistor, the second end of the initialization transistor is connected with the initialization signal line, the control end of the initialization transistor is used for receiving a third control signal, the initialization transistor is used for initializing the control end of the driving transistor according to the third control signal, and the control end of the initialization transistor is connected with the first scanning signal line.
In this embodiment, when the first control signal, the second control signal, the third control signal, and the fourth control signal are different from each other, the anticreeping transistor is controlled by the independent control signal.
The first light-emitting control transistor is connected between the driving transistor and the first power voltage signal line, and a control end of the first light-emitting control transistor is connected with the light-emitting control signal line. The first light-emitting control transistor is used for controlling the time for outputting the first power supply voltage input by the first power supply voltage signal line to the driving transistor according to the light-emitting control signal input by the light-emitting control signal line.
And the second light-emitting control transistor is connected between the driving transistor and the anode of the light-emitting diode, and the control end of the second light-emitting control transistor is connected with the light-emitting control signal line. The second light-emitting control transistor is used for controlling the time for outputting the driving current output by the driving crystal to the light-emitting diode according to the light-emitting control signal input by the light-emitting control signal line.
And a storage capacitor connected between the first power supply voltage signal line and the control terminal of the driving transistor for maintaining a voltage difference between the first power supply voltage and a voltage of the control terminal of the driving transistor.
The pixel circuit is described in detail with reference to specific embodiments.
First embodiment
Fig. 2 is an equivalent circuit diagram of a single pixel circuit according to the first embodiment of the present application. The pixel circuit includes a driving transistor T1, a switching transistor T2, a compensation transistor T3, an initialization transistor T4, a first light emission control transistor T5, a second light emission control transistor T6, a reset transistor T7, an anti-leakage transistor T8, a storage capacitor C, and an organic light emitting diode OLED.
The organic light emitting diode OLED includes an anode and a cathode, and the anode of the organic light emitting diode OLED is connected to the second terminal of the second light emission controlling transistor T6 and the second terminal of the reset transistor T7. The cathode of the organic light emitting diode OLED is connected to the second power voltage terminal ELVSS. The second power voltage terminal ELVSS is used to load a second power voltage, and is connected to the second power voltage signal line.
A first terminal of the storage capacitor C is connected to the first node Q, a second terminal of the storage capacitor C is connected to a first power voltage terminal ELVDD for loading a first power voltage, and the first power voltage terminal ELVDD is connected to the first power voltage signal line. The storage capacitor C is used to maintain the potential of the first node Q, so that the organic light emitting diode OLED emits light for one frame time.
The first end of the driving transistor T1 is connected to the anode of the organic light emitting diode OLED through the second light emitting control transistor T6, so that the first end of the driving transistor T1 is electrically connected to the organic light emitting diode OLED. The control terminal of the driving transistor T1 is connected to the first node Q, the first terminal of the storage capacitor C, and the first terminal of the anti-leakage transistor T8. The second terminal of the driving transistor T1 is connected to the first power voltage terminal ELVDD through the first light emitting control transistor T5, and the second terminal of the driving transistor T1 is connected to the first terminal of the switching transistor T1. The driving transistor T1 is used to control the operating state of the organic light emitting diode OLED according to the potential of the first node Q.
The control terminal of the switch transistor T2 is connected to the second scan signal terminal scan (n), the first terminal of the switch transistor T2 is connected to the second terminal of the driving transistor T1, the second terminal of the switch transistor T2 is connected to the Data signal terminal Data, the second scan signal terminal scan (n) is connected to the second scan line and is used for loading the second scan signal, the Data signal terminal Data is connected to the Data line and is used for loading the Data signal, and n is an integer greater than or equal to 2. The switching transistor T2 is used for transmitting a data signal to the second terminal of the driving transistor T1 according to the second scan signal.
The control terminal of the compensation transistor T3 is connected to the second scan signal terminal scan (n), the first terminal of the compensation transistor T3 is connected to the first terminal of the driving transistor T1, and the second terminal of the compensation transistor T3 is connected to the second node P. The compensating transistor T3 is used for electrically connecting the first terminal of the driving transistor T1 and the control terminal according to the second scan signal inputted from the second scan signal line.
The control terminal of the initialization transistor T4 is connected to the first Scan signal terminal Scan (n-1), the first terminal of the initialization transistor T4 is connected to the second node P, the second terminal of the initialization transistor T4 is connected to the initialization signal terminal Vint, the first Scan signal terminal Scan (n-1) is connected to the first Scan signal line and is used for loading the first Scan signal, and the initialization signal terminal Vint is connected to the initialization signal line and is used for loading the initialization signal. The initialization transistor T4 is used to transmit an initialization signal to the first node Q through the anti-leakage transistor T8 that is turned on according to the first scan signal, so as to initialize the potential of the first node Q.
A control terminal of the first light emission controlling transistor T5 is connected to the light emission control signal terminal EM, a first terminal of the first light emission controlling transistor T5 is connected to the second terminal of the driving transistor T1, a second terminal of the first light emission controlling transistor T5 is connected to the first power voltage terminal ELVDD, and the light emission control signal terminal EM is connected to the light emission control signal line and is used to load the light emission control signal. The first light emitting control transistor T5 is for transmitting a first power voltage to the second terminal of the driving transistor T1 according to a light emitting control signal.
A control terminal of the second light emission controlling transistor T6 is connected to the light emission control signal terminal EM, a first terminal of the second light emission controlling transistor T6 is connected to the first terminal of the driving transistor T1, and a second terminal of the second light emission controlling transistor T6 is connected to the anode of the organic light emitting diode OLED. The second light emission controlling transistor T6 is for transmitting the driving current output from the driving transistor T1 to the organic light emitting diode OLED according to the light emission control signal input from the light emission control signal line.
The control terminal of the reset transistor T7 is connected to the second scan signal terminal scan (n), the first terminal of the reset transistor T7 is connected to the anode of the organic light emitting diode OLED, and the second terminal of the reset transistor T7 is connected to the initialization signal terminal Vint. The reset transistor T7 is used to transmit a reset signal to the anode of the organic light emitting diode according to a second scan signal inputted from a second scan signal line. The initialization signal terminal Vin is connected to the initialization signal line and is also used for inputting a reset signal.
The control terminal of the anti-leakage transistor T8 is connected to the emission control signal terminal EM, the first terminal of the anti-leakage transistor T8 is connected to the first node Q, and the second terminal of the anti-leakage transistor T8 is connected to the second node P, i.e., the anti-leakage transistor T8 is connected between the control terminal of the driving transistor T1 and the initialization transistor T4, and is connected between the control terminal of the driving transistor T1 and the compensation transistor T3. The anticreep transistor T8 is used for turning off the light emitting control signal inputted by the light emitting control signal line when the light emitting diode is in the light emitting state. The anti-leakage transistor T8 includes an active layer having an oxide semiconductor, and has low leakage characteristics when the oxide semiconductor thin film transistor is turned off, so that it is possible to suppress a change in the potential of the first node Q when the driving transistor T1 drives the organic light emitting diode OLED to emit light, and to prevent a change in the potential of the first node Q caused by leakage of the initialization transistor T4 and the compensation transistor T3.
In the present embodiment, the driving transistor T1, the switching transistor T2, the compensating transistor T3, the initializing transistor T4, the first light emission controlling transistor T5, the second light emission controlling transistor T6, and the reset transistor T7 are all P-type transistors having a polysilicon active layer. The anticreep transistor T8 is an N-type transistor. The control end of the N-type transistor is switched on by inputting high level, and is switched off by inputting low level. The control end of the P-type transistor is switched off by inputting high level, and is switched on by inputting low level.
Please refer to fig. 3, which is a driving timing diagram corresponding to the equivalent circuit diagram shown in fig. 2. The driving method of the pixel circuit shown in fig. 2 includes the steps of:
in the initialization stage T1, the first Scan signal line transmits the first Scan signal Scan (n-1) with a low level to the first Scan signal terminal Scan (n-1), the second Scan signal line transmits the second Scan signal Scan (n) with a high level to the second Scan signal terminal Scan (n), the emission control signal line transmits the emission control signal EM (n) with a high level to the emission control signal terminal EM, the initialization transistor T4 and the anti-leakage transistor T8 are turned on, the driving transistor T1, the switching transistor T2, the compensation transistor T3, the first emission control transistor T5, the second emission control transistor T6 and the reset transistor T7 are all turned off, and the initialization transistor T4 transmits the initialization signal input from the initialization signal line to the first node Q through the turned-on anti-leakage transistor T8, so as to initialize the first node Q.
In the threshold voltage compensation and data writing period T2, the first Scan signal line transmits the first Scan signal Scan (n-1) with a high level to the first Scan signal terminal Scan (n-1), the second Scan signal line transmits the second Scan signal Scan (n) with a low level to the second Scan signal terminal Scan (n), the emission control signal line transmits the emission control signal EM (n) with a high level to the emission control signal terminal EM, the compensation transistor T3, the switching transistor T2, the reset transistor T7, and the anti-leakage transistor T8 are all turned on, and the driving transistor T1, the initialization transistor T4, the first emission control transistor T5, and the second emission control transistor T6 are all turned off. Since the compensation transistor T3 and the anti-leakage transistor T8 are both turned on, the first terminal of the driving transistor T1 and the control terminal of the driving transistor are electrically connected through the turned-on compensation transistor T3 and the turned-on anti-leakage transistor T8. The switching transistor T2 transmits the Data signal inputted from the Data signal terminal Data to the second terminal of the driving transistor T1. The reset transistor T7 transmits a reset signal input from the initialization signal terminal Vint to the anode of the organic light emitting diode OLED to reset the anode of the organic light emitting diode OLED.
In the light emitting period T3, the first Scan signal line transmits the first Scan signal Scan (n-1) of high level to the first Scan signal terminal Scan (n-1), the second Scan signal line transmits the second Scan signal Scan (n) of high level to the second Scan signal terminal Scan (n), the light emitting control signal line transmits the light emitting control signal EM (n) of low level to the light emitting control signal terminal EM, the switching transistor T2, the initialization transistor T4, the compensation transistor T3, the reset transistor T7, and the anti-leakage transistor T8 are all turned off, and the first light emitting control transistor T5 and the second light emitting control transistor T6 are turned on. The driving transistor T1 generates a driving current by a voltage difference between the voltage of the first node Q and the voltage of the second terminal of the driving transistor T1, the driving current is transmitted to the organic light emitting diode OLED through the second light emitting control transistor T6, the organic light emitting diode OLED emits light, and the capacitor C maintains the potential of the first node Q during the light emission of the organic light emitting diode OLED.
In the pixel circuit of the embodiment, the anti-leakage transistor is additionally arranged between the grid electrode of the driving transistor and the initialization transistor and between the grid electrode of the driving transistor and the compensation transistor, the anti-leakage transistor comprises an active layer with an oxide semiconductor, the low-leakage characteristic is realized when the metal oxide transistor is closed, the position setting of the anti-leakage transistor is matched, and the anti-leakage transistor is in a closed state when the organic light-emitting diode is in a light-emitting state, so that the potential change of the grid electrode of the driving transistor in the light-emitting process of the light-emitting diode is inhibited, the grid electrode of the driving transistor is prevented from leaking electricity through the initialization transistor and the compensation transistor, the power consumption is favorably reduced, the low-frequency display is favorably realized, the flicker problem of. In addition, the anti-leakage transistor is selected to be N-type, and the control signal of the anti-leakage transistor is the light-emitting control signal, so that the control signals of the first light-emitting control transistor T5, the second light-emitting control transistor T6 and the anti-leakage transistor T8 of the pixel circuit of this embodiment are the same, and the same driving circuit outputting the light-emitting control signal can be adopted to drive so as to reduce the number of the driving circuits, and the driving circuit outputting the light-emitting control signal is generally arranged at the frame of the display device, so that the reduction of the number of the driving circuits is beneficial to reducing the layout space required by the frame of the display device.
Second embodiment
Please refer to fig. 4, which is an equivalent circuit diagram of a pixel circuit of a single pixel according to a second embodiment of the present application. The pixel circuit of the second embodiment is substantially similar to the pixel circuit of the first embodiment, except that the pixel circuit further includes a reset transistor T9, a control terminal of the reset transistor T9 is connected to the first control signal input terminal, a first terminal of the reset transistor T9 is connected to the second node P, a second terminal of the reset transistor T9 is connected to an initialization signal terminal Vint, and the initialization signal terminal Vint is connected to an initialization signal line. The reset transistor T9 is used for being turned on according to the first control signal when the organic light emitting diode OLED is in a light emitting state and transmitting the fixed reference voltage to the second node P.
In the present embodiment, the reset transistor T9 includes an active layer having low temperature polysilicon, and the reset transistor T9 is a P-type transistor.
In this embodiment, the first control signal input terminal is an emission control signal terminal EM, the first control signal is an emission control signal, and the emission control signal terminal EM is connected to the emission control signal line. The light-emitting control signal controls the reset transistor T9 to be turned on and controls the anti-leakage transistor T8 to be turned off, so that the light-emitting control signals for controlling the reset transistor T9 and the anti-leakage transistor T8 in the pixel circuit of the embodiment are both output by the same driving circuit, and the display device can realize a narrow frame.
Since the potential of the second node P may change with the operating state of the surrounding transistors (T3, T4, and T8) during the driving process of the pixel circuit, when the organic light emitting diode OLED is in the light emitting state, the potential of the second node P may be in a floating state, and the reset transistor T9 sets the potential of the second node P to the fixed reference voltage when the light emitting diode OLED is in the light emitting state, so that the situation that the potential of the second node P is in the floating state to cause the conduction of the anti-leakage transistor T8 and cause the leakage of the first node Q through the initialization transistor T4 and the compensation transistor T3 can be avoided, and the problem of flicker during the light emitting process of the organic light emitting diode can be further avoided.
The driving sequence of the pixel circuit of this embodiment is the same as that of fig. 3, and the driving process further includes turning on the reset transistor T9 during the light-emitting period T3, and transmitting the fixed reference voltage inputted from the initialization signal terminal Vint to the second node P, so that the potential of the second node P is fixed, and the potential of the second node P is prevented from being in a floating state.
Third embodiment
Please refer to fig. 5, which is an equivalent circuit diagram of a pixel circuit of a single pixel according to a third embodiment of the present application. The pixel circuit of the third embodiment is substantially similar to the pixel circuit of the first embodiment except that the reset transistor T7 and the initialization transistor T4 are connected in a different manner. The control terminal of the reset transistor T7 is connected to the first Scan signal terminal Scan (n-1), the first terminal of the reset transistor T7 is connected to the anode of the organic light emitting diode OLED, and the second terminal of the reset transistor T7 is connected to the first terminal of the initialization transistor T4 and the second node P. The reset transistor T7 is used for transmitting an initialization signal to the anode of the organic light emitting diode according to a first scan signal input from the first scan signal terminal.
The driving process of the pixel circuit of the embodiment of the present application is substantially similar to that of the pixel circuit of the first embodiment, except that the reset transistor T7 is turned on during the initialization phase and transmits the initialization signal, which is transmitted from the initialization transistor T4 to the second terminal of the reset transistor T7, to the anode of the organic light emitting diode OLED.
It should be noted that the solution of the present embodiment can also be applied to the first embodiment and the second embodiment.
Fourth embodiment
Please refer to fig. 6, which is an equivalent circuit diagram of a pixel circuit of a single pixel according to a fourth embodiment of the present application. The pixel circuit of the fourth embodiment is substantially similar to the pixel circuit of the first embodiment except that the control terminal of the anti-leakage transistor T8 is connected to the third scan signal terminal Nscan which is connected to the third scan signal line to input the third scan signal, i.e., the control terminal of the anti-leakage transistor T8 is connected to the third scan signal line. When the third scan signal is at a high level, the anticreeping transistor T8 is turned on; when the third scan signal is low, the anticreeping transistor T8 is turned off.
In this embodiment, the third scan signal, the first scan signal, the second scan signal, and the light emission control signal are different from each other.
The driving timing sequence of the pixel circuit of this embodiment is substantially similar to that of the first embodiment, except that the third scan signal is high during the initialization period t1, high during the threshold voltage compensation and data writing period t2, and low during the light emitting period t 3.
As is apparent from the first to fourth embodiments, the anticreeping transistor T8 may be controlled by an independent control signal or may be controlled by a light emission control signal.
The above description of the embodiments is only for assisting understanding of the technical solutions and the core ideas thereof; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (19)
1. A pixel circuit, comprising:
a light emitting diode;
the first end of the driving transistor is electrically connected with the light emitting diode, and the control end of the driving transistor is connected with the first node and used for controlling the working state of the light emitting diode according to the potential of the first node;
a leakage prevention transistor having a first terminal connected to the first node and a second terminal connected to the second node, the leakage prevention transistor including an active layer having an oxide semiconductor and being in an off state when the light emitting diode is in a light emitting state;
the first end of the initialization transistor is connected with the second node, and the second end of the initialization transistor is connected with an initialization signal line and used for transmitting an initialization signal input by the initialization signal line to the first node; and the number of the first and second groups,
and a compensation transistor, a first end of the compensation transistor being connected to the first end of the driving transistor, and a second end of the compensation transistor being connected to the second node, for electrically connecting the first end of the driving transistor and the control end of the driving transistor.
2. The pixel circuit according to claim 1, further comprising a reset transistor, wherein a first terminal of the reset transistor is connected to the second node, and a second terminal of the reset transistor is connected to the initialization signal line, and is configured to turn on according to a first control signal when the light emitting diode is in a light emitting state, and transmit a fixed reference voltage input from the initialization signal line to the second node.
3. The pixel circuit according to claim 2, wherein the reset transistor comprises an active layer comprising low temperature polysilicon.
4. The pixel circuit according to claim 2 or 3, wherein the anti-leakage transistor is configured to be in an off state according to the first control signal when the light emitting diode is in a light emitting state,
the anti-creeping transistor is an N-type transistor, and the reset transistor is a P-type transistor.
5. The pixel circuit according to claim 2, wherein the anti-leakage transistor is configured to be in an off state according to a second control signal when the light emitting diode is in a light emitting state;
the initialization transistor is used for transmitting an initialization signal input by the initialization signal line to the first node according to a third control signal;
the compensation transistor is used for enabling the first end of the driving transistor and the control end of the driving transistor to be electrically connected according to a fourth control signal,
the first control signal, the second control signal, the third control signal, and the fourth control signal are different from each other.
6. The pixel circuit according to claim 1, further comprising a reset transistor, wherein a first terminal of the reset transistor is connected to the anode of the light emitting diode, and a second terminal of the reset transistor is connected to the first terminal of the initialization transistor and the second node, for transmitting the initialization signal to the anode of the light emitting diode according to a third control signal;
the initialization transistor is configured to transmit the initialization signal to the second terminal of the reset transistor and the first node according to the third control signal.
7. The pixel circuit according to claim 1, further comprising a reset transistor, wherein a first terminal of the reset transistor is connected to the anode of the light emitting diode, and a second terminal of the reset transistor is connected to the initialization signal line, for transmitting a reset signal inputted from the initialization signal line to the anode of the light emitting diode according to a fourth control signal;
the compensation transistor is used for enabling the first end of the driving transistor and the control end of the driving transistor to be electrically connected according to the fourth control signal.
8. The pixel circuit according to claim 1, further comprising:
a first end of the switching transistor is connected with the second end of the driving transistor, and a second end of the switching transistor is connected with a data signal line and used for transmitting a data signal input by the data signal line to the second end of the driving transistor according to a fourth control signal;
a first end of the first light-emitting control transistor is connected with the second end of the driving transistor, the second end of the first light-emitting control transistor is connected with a power supply voltage signal line, and a control end of the first light-emitting control transistor is connected with a light-emitting control signal line and used for transmitting the power supply voltage input by the power supply voltage signal line to the second end of the driving transistor according to a light-emitting control signal input by the light-emitting control signal line;
a first end of the second light-emitting control transistor is connected with the first end of the driving transistor, a second end of the second light-emitting control transistor is connected with an anode of the light-emitting diode, and a control end of the second light-emitting control transistor is connected with the light-emitting control signal line and used for transmitting the driving current output by the driving transistor to the light-emitting diode according to the light-emitting control signal;
a storage capacitor having a first terminal connected to a first node and a second terminal connected to the supply voltage signal line.
9. The pixel circuit according to claim 8, wherein the driving transistor, the switching transistor, the compensation transistor, the initialization transistor, the first light emission control transistor, and the second light emission control transistor are all P-type transistors having a polysilicon active layer.
10. A display device, characterized in that the display device comprises:
a light emitting diode;
a driving transistor for transmitting a driving current to the light emitting diode;
the initialization transistor is used for transmitting an initialization signal to the control end of the driving transistor;
a compensation transistor for transmitting a data signal having a compensated threshold voltage to a control terminal of the driving transistor; and
and an anti-leakage transistor connected between the control terminal of the driving transistor and the initialization transistor and between the control terminal of the driving transistor and the compensation transistor, the anti-leakage transistor including an active layer having an oxide semiconductor.
11. The display device according to claim 10, wherein the leakage preventing transistor includes a first terminal connected to the control terminal of the driving transistor and a second terminal connected to the initialization transistor and the compensation transistor,
the display device further comprises a reset transistor, wherein the reset transistor is connected with the second end of the anti-leakage transistor and used for being conducted according to a first control signal and transmitting a fixed reference voltage signal to the second end of the anti-leakage transistor.
12. The display device according to claim 11, wherein the anticreeping transistor is configured to be in an off state according to the first control signal,
the anti-creeping transistor is an N-type transistor, and the reset transistor is a P-type transistor.
13. The display device according to claim 11 or 12, wherein a control terminal of the reset transistor is connected to a light emission control signal line, and the first control signal is a light emission control signal input from the light emission control signal line.
14. The display device according to claim 11, wherein the reset transistor comprises an active layer comprising low temperature polysilicon.
15. The display device according to claim 11, wherein the anticreeping transistor is configured to be in an off state according to a second control signal when the light emitting diode is in a light emitting state;
the initialization transistor is used for transmitting an initialization signal to the control end of the driving transistor according to a third control signal;
the compensation transistor is used for transmitting a data signal with a compensated threshold voltage to the control end of the driving transistor according to a fourth control signal,
the first control signal, the second control signal, the third control signal, and the fourth control signal are different from each other.
16. The display device according to claim 10, further comprising a reset transistor, wherein a first terminal of the reset transistor is connected to an anode of the light emitting diode, a second terminal of the reset transistor is connected to a first terminal of an initialization transistor, and a control terminal of the reset transistor is configured to receive a third control signal;
the first end of the initialization transistor is connected with the second end of the reset transistor, the control end of the initialization transistor is used for receiving the third control signal, and the second end of the initialization transistor is used for receiving an initialization signal.
17. The display device according to claim 10, further comprising a reset transistor, wherein a first terminal of the reset transistor is connected to an anode of the light emitting diode, a second terminal of the reset transistor is connected to an initialization signal line, a control terminal of the reset transistor is configured to receive a fourth control signal, and a control terminal of the initialization transistor is configured to receive a third control signal.
18. The display device according to claim 10, further comprising:
the switch transistor is connected with the driving transistor, a second end of the switch transistor is connected with the data signal line, and a control end of the switch transistor is used for receiving a fourth control signal;
the first light-emitting control transistor is connected between the driving transistor and the power supply voltage signal line, and the control end of the first light-emitting control transistor is connected with the light-emitting control signal line;
the second light-emitting control transistor is connected between the driving transistor and the anode of the light-emitting diode, and the control end of the second light-emitting control transistor is connected with the light-emitting control signal line;
and a storage capacitor connected between a power supply voltage signal line and the control terminal of the driving transistor.
19. The display device according to claim 18, wherein the switching transistor, the compensation transistor, the initialization transistor, the first light emission control transistor, and the second light emission control transistor are all P-type transistors having a polysilicon active layer.
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| CN202021399676.XU CN212724668U (en) | 2020-07-15 | 2020-07-15 | Pixel circuit and display device |
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|---|---|---|---|
| CN202021399676.XU CN212724668U (en) | 2020-07-15 | 2020-07-15 | Pixel circuit and display device |
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| CN212724668U true CN212724668U (en) | 2021-03-16 |
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| CN111724745A (en) * | 2020-07-15 | 2020-09-29 | 武汉华星光电半导体显示技术有限公司 | Pixel circuit, driving method thereof and display device |
| CN114023239A (en) * | 2021-11-16 | 2022-02-08 | 武汉华星光电半导体显示技术有限公司 | Pixel circuit and display panel |
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| CN111724745A (en) * | 2020-07-15 | 2020-09-29 | 武汉华星光电半导体显示技术有限公司 | Pixel circuit, driving method thereof and display device |
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