CN114913812A - Pixel circuit, driving method thereof and organic light emitting display device - Google Patents
Pixel circuit, driving method thereof and organic light emitting display device Download PDFInfo
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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Abstract
The present application provides a pixel circuit, a driving method thereof and an organic light emitting display device, wherein the pixel circuit includes: the organic light emitting diode, the storage capacitor, the first transistor to the eighth transistor, wherein the control end and the first end of the eighth transistor are both connected with the first power supply, and the second end of the eighth transistor is connected to the second node. In the pixel circuit, the driving method thereof and the organic light emitting display device, the eighth transistor with the short-circuited grid source is arranged between the first power supply and the second node of the pixel circuit, and the potential of the second node is pulled high by the eighth transistor, so that leakage currents existing in a path where the initialization transistor and the compensation transistor are located are compensated, and further, power consumption reduction and low-frequency display are facilitated.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a pixel circuit, a driving method thereof, and an organic light emitting display device.
Background
Compared with many Display devices, an Organic Light Emitting Display (OLED for short) has many advantages of being solid-state, self-luminous, wide in viewing angle, wide in color gamut, fast in reaction speed, high in luminous efficiency, high in brightness, high in contrast, ultra-thin, ultra-Light, low in power consumption, wide in working temperature range, capable of manufacturing large-sized and flexible panels, simple in manufacturing process and the like, can achieve flexible Display in a real sense, and can meet the requirements of people on future displays.
The power consumption of the display is generally proportional to the display driving frequency, which needs to be reduced in order to reduce the power consumption of the product. For example, since a wearable product needs to operate in a standby mode for a long time, a standby screen generally reduces a refresh frequency to achieve low power consumption. The refresh frequency of wearing products has been reduced to 15Hz at present, possibly to 5Hz or even to 1Hz in the future.
However, after the driving frequency of the display is reduced, due to the existence of leakage current, the voltage of the pixel electrode is continuously reduced in the holding stage, and the display image is easy to flicker and bright spots, which affects the display effect. The standby screen of the wearing product generally uses a black screen as a background, so that the problems of screen flicker and bright spots caused by leakage current are more serious.
Therefore, how to solve the problems of image flicker and bright spots caused by the leakage current of the conventional organic light emitting display device becomes a technical problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
In view of the above, the present disclosure provides a pixel circuit, a driving method thereof and an organic light emitting display device to solve the problems of flicker and bright spots of an image due to a leakage current in the organic light emitting display device in the prior art.
To solve the above technical problem, the present invention provides a pixel circuit, including: an organic light emitting diode;
a first transistor connected between the first node and the data line, and having a control terminal connected to the second scan line;
a second transistor connected between the first node and a third node, a control terminal of which is connected to the second node;
the third transistor is connected between the second node and the third node, and the control end of the third transistor is connected with the second scanning line;
a fourth transistor connected between the first power supply and the first node, a control terminal of which is connected to the emission control line;
a fifth transistor connected between the third node and the anode of the organic light emitting diode, a control terminal of which is connected with the emission control line;
a sixth transistor connected between the second node and the initialization signal terminal, a control terminal of which is connected to the first scan line;
the seventh transistor is connected between the initialization signal end and the anode of the organic light-emitting diode, and the control end of the seventh transistor is connected with the first scanning line;
an eighth transistor having a control terminal and a first terminal both connected to the first power supply, and a second terminal connected to the second node; and
a storage capacitor connected between the first power supply and the second node;
and the cathode of the organic light emitting diode is connected with a second power supply.
Optionally, in the pixel circuit, the first power supply and the second power supply are used as a driving power supply for the organic light emitting diode, the first power supply is used to provide a first power supply voltage, the second power supply is used to provide a second power supply voltage, and the initialization signal terminal is used to provide an initialization signal.
Optionally, in the pixel circuit, the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, and the seventh transistor are all P-type thin film transistors.
Optionally, in the pixel circuit, the third transistor and the sixth transistor are both double-gate transistors.
Optionally, in the pixel circuit, the first transistor is used as a switching transistor, and is configured to transmit a data signal to the second terminal of the driving transistor according to a second scan signal;
the second transistor is used as a driving transistor for controlling the driving current provided to the organic light emitting diode according to the potential of the second node;
the fourth transistor and the fifth transistor are both used as light emitting control transistors, the fourth transistor is used for transmitting a first power supply voltage to the first end of the driving transistor according to the light emitting control signal provided by the emission control line, and the fifth transistor is used for transmitting the driving current output by the driving transistor to the organic light emitting diode according to the light emitting control signal provided by the emission control line.
Optionally, in the pixel circuit, the third transistor is used as a compensation transistor, and is configured to electrically connect the second terminal of the second transistor to the control terminal of the second transistor according to a second scan signal provided by the second scan line;
the sixth transistor is used as an initialization transistor and is used for transmitting an initialization signal provided by the initialization signal terminal to the second node according to a first scanning signal provided by the first scanning line.
Optionally, in the pixel circuit, the initialization signal terminal is further configured to provide a reset signal, and the seventh transistor is used as a reset transistor, and is configured to transmit the reset signal provided by the initialization signal terminal to an anode of the organic light emitting diode according to the first scan signal provided by the first scan line.
Correspondingly, the invention also provides a driving method of the pixel circuit, which comprises the following steps: providing the pixel circuit, wherein a scanning period of the pixel circuit comprises an initialization phase, a threshold voltage compensation and data writing phase and a light emitting phase, and the threshold voltage compensation and data writing phase is located between the initialization phase and the light emitting phase;
in an initialization stage, the sixth transistor and the seventh transistor are turned on, an initialization signal is transmitted to the second node through the sixth transistor, and meanwhile, the initialization signal is transmitted to the anode of the organic light emitting diode through the seventh transistor;
in the threshold voltage compensation and data writing stage, the third transistor is opened, and the first end of the second transistor is electrically connected with the control end of the second transistor;
in a light emitting stage, a fourth transistor and a fifth transistor are turned on, at the moment, the third transistor, the sixth transistor and the seventh transistor are all in a closed state, and the second transistor is turned on and drives the light emitting diode to emit light;
wherein the eighth transistor is in an off state throughout the scan period.
Accordingly, the present invention also provides an organic light emitting display device including the pixel circuit as described above.
In the pixel circuit, the driving method thereof and the organic light-emitting display device provided by the invention, the eighth transistor with the short-circuit grid source is arranged between the first power supply and the second node of the pixel circuit, and the potential of the second node is pulled up by using the eighth transistor, so that the leakage current existing in the path where the initialization transistor and the compensation transistor are located is compensated, and further, the reduction of power consumption and the low-frequency display are facilitated.
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 an equivalent circuit diagram of a pixel circuit according to an embodiment of the present invention;
fig. 2 is a driving timing diagram of a pixel circuit according to an 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.
Please refer to fig. 1, which is a schematic structural diagram of a pixel circuit according to an embodiment of the invention. As shown in fig. 1, the pixel circuit 10 includes: an Organic Light Emitting Diode (OLED); a first transistor T1 connected between the first node N1 and the DATA line DATA, and having a control terminal connected to the second scan line Sn; a second transistor T2 connected between the first node N1 and the third node N3, and having a control terminal connected to the second node N2; a third transistor T3 coupled between the second node N2 and the third node N3, and having a control terminal coupled to the second scan line Sn; a fourth transistor T4 connected between the first power source ELVDD and the first node N1, a control terminal thereof being connected to the emission control line EM; a fifth transistor T5 connected between the third node N3 and the anode of the organic light emitting diode OLED, a control terminal of which is connected with the emission control line EM; a sixth transistor T6 connected between the second node N2 and the initialization signal terminal VINT, and having a control terminal connected to the first scan line Sn-1; a seventh transistor T7 connected between an initialization signal terminal VINT and an anode of the organic light emitting diode OLED, and having a control terminal connected to the first scan line Sn-1; an eighth transistor T8 having a control terminal and a first terminal both connected to the first power source ELVDD, and a second terminal connected to the second node N2; and a storage capacitor Cs connected between the first power source ELVDD and the second node N2; and the cathode of the organic light emitting diode OLED is connected with a second power supply ELVSS.
Specifically, the first power ELVDD and the second power ELVSS are used as driving power sources for the organic light emitting diodes OLED, the first power ELVDD is used to provide a first power voltage, the second power ELVSS is used to provide a second power voltage, the first power voltage is at a high level, the second power voltage is at a low level, and the initialization signal terminal VINT is used to provide an initialization voltage.
The organic light emitting diode OLED includes an anode and a cathode, the anode of the organic light emitting diode OLED is connected to the second end of the fifth transistor T5 and the second end of the seventh transistor T7, the cathode of the organic light emitting diode OLED is connected to the second power ELVSS, and the organic light emitting diode OLED emits light with a corresponding brightness according to a driving current flowing therethrough.
A first terminal of the storage capacitor Cs is connected to the second node N2, a second terminal of the storage capacitor Cs is connected to the first power source ELVDD, and the storage capacitor Cs is configured to maintain a potential of the second node N2, so that the organic light emitting diode OLED emits light in one frame time.
A first end of the first transistor T1 is connected to a DATA line DATA, a second end is connected to a first node N1, a control end is connected to a second scan line Sn, the second scan line Sn is used for loading a second scan signal, and the DATA line DATA is used for loading a DATA signal. Wherein n is an integer greater than or equal to 2.
The second transistor T2 has a first terminal connected to the first node N1, a second terminal connected to the third node N3, and a control terminal connected to the second node N2.
In this embodiment, the first transistor T1 serves as a switching transistor, the second transistor T2 serves as a driving transistor, the first transistor T1 serves to transmit a data signal to the second terminal of the driving transistor according to the second scan signal, and the second transistor T2 serves to control the operating state of the organic light emitting diode OLED according to the potential of the second node N2.
The third transistor T3 has a first terminal connected to the second node N2, a second terminal connected to the third node N3, and a control terminal connected to the second scan line Sn. In this embodiment, the third transistor T3 is used as a compensation transistor for electrically connecting the second terminal of the driving transistor T1 to the control terminal thereof according to the second scan signal inputted by the second scan line Sn.
The fourth transistor T4 has a first terminal connected to the first power source ELVDD and a second terminal connected to the first node N1. A first terminal of the fifth transistor T5 is connected to the third node N3, and a second terminal thereof is connected to an anode of the organic light emitting diode OLED. In this embodiment, the fourth transistor T4 and the fifth transistor T5 are both light emitting control transistors, control terminals of the fourth transistor T4 and the fifth transistor T5 are both connected to an emission control line EM, the emission control line EM is used for loading a light emitting control signal, the fourth transistor T4 is used for transmitting a first power voltage to a first terminal of the driving transistor T2 according to the light emitting control signal, and the fifth transistor T5 is used for transmitting a driving current output by the driving transistor T2 to the organic light emitting diode OLED according to the light emitting control signal.
A first terminal of the sixth transistor T6 is connected to the second node N2, a second terminal thereof is connected to the initialization signal terminal VINT, and a control terminal thereof is connected to the first scan line Sn-1, where the first scan line Sn-1 is used for loading the first scan signal. In this embodiment, the sixth transistor T6 is used as an initialization transistor for transmitting an initialization signal provided by the initialization signal terminal VINT to the second node N2 according to the first scan signal, so as to initialize the potential of the second node N2.
A first terminal of the seventh transistor T7 is connected to the initialization signal terminal VINT, a second terminal thereof is connected to the anode of the organic light emitting diode OLED, and a control terminal thereof is connected to the first scan line Sn-1. In this embodiment, the initialization signal terminal VINT is further configured to provide a reset signal, and the seventh transistor T7 is used as a reset transistor for transmitting the reset signal to the anode of the organic light emitting diode OLED according to the first scan signal provided by the first scan line Sn-1.
A control terminal and a first terminal of the eighth transistor T8 are both connected to the first power source ELVDD, and a second terminal of the eighth transistor T8 is connected to the second node N2. In this embodiment, the eighth transistor T8 is always turned off as a leakage compensation transistor, and when the second node N2 is kept at a constant potential for a long time, the leakage generated by the eighth transistor T8 pulls up the potential of the second node N2, thereby compensating the leakage of the third transistor T3/sixth transistor T6 path.
As shown in fig. 1, in the pixel circuit 10, the third transistor T3 and the sixth transistor T6 are main leakage paths, the potential of the control point (i.e., the second node N2) of the driving transistor T2 is leaked through the third transistor (i.e., the compensating transistor) T3 and the sixth transistor (the initializing transistor) T6, respectively, and the leakage current flows from the second node N2 to the initializing signal terminal VINT and the anode of the organic light emitting diode OLED when the black state is displayed, so that the potential of the second node N2 is easily pulled low, thereby generating a problem of flicker, while the gate-source short circuit of the eighth transistor T8 generates a leakage current, which pulls high the potential of the second node N2, thereby compensating the leakage current of the third transistor T3/sixth transistor T6 paths.
In this embodiment, each of the first to seventh transistors T1 to T7 has a first end, a second end and a control end, wherein the first end is a source, the second end is a drain, and the control end is a gate.
In this embodiment, the pixel circuit 10 is an 8T1C type circuit structure, and includes 8 tfts and 1 capacitor, where 8 tfts are all P-type tfts, that is, the first transistor T1 to the eighth transistor T8 are all P-type tfts, and the P-type tfts are turned on when the control terminal is at low level and turned off when the control terminal is at high level.
The third transistor T3 and the sixth transistor T6 are double-gate transistors, and the double-gate transistors have low leakage characteristics, so that the potential change of the second node N2 when the driving transistor T2 drives the organic light emitting diode OLED to emit light can be further suppressed, and the potential change of the second node N2 caused by leakage of the initialization transistor T6 and the compensation transistor T3 can be avoided.
Correspondingly, the invention also provides a driving method of the pixel circuit 10. The driving method of the pixel circuit 10 includes: the scanning period comprises an initialization stage, a threshold voltage compensation and data writing stage and a light emitting stage, wherein the threshold voltage compensation and data writing stage is positioned between the initialization stage and the light emitting stage;
in the initialization stage, the sixth transistor T6 and the seventh transistor T7 are turned on, and the initialization signal is transmitted to the second node N2 through the sixth transistor T6 while being transmitted to the anode of the organic light emitting diode OLED through the seventh transistor T7;
in the threshold voltage compensation and data writing phases, the third transistor T3 is turned on and the first end of the second transistor T2 is electrically connected with the control end of the second transistor T2;
in the light emitting phase, the fourth transistor T4 and the fifth transistor T5 are turned on, and at this time, the third transistor T3, the sixth transistor T6 and the seventh transistor T7 are all in the off state, and the second transistor T2 is turned on and drives the light emitting diode OLED to emit light;
wherein the eighth transistor T8 is in an off state throughout the scan period.
Specifically, as shown in fig. 2, the scan cycle of the pixel circuit 10 includes a first period t1, a second period t2, a third period t3, a fourth period t4, a fifth period t5 and a sixth period t 6.
In the first period T1, the control signal provided by the emission control line EM changes from low level to high level, turning off the fourth transistor T4 and the fifth transistor T5, so that the organic light emitting diode OLED stops emitting light.
In a second period (i.e., an initialization period) T2, the first scan signal supplied from the first scan line Sn-1 is changed from a high level to a low level, the sixth transistor T6 and the seventh transistor T7 are turned on, and the second node N2 and the anode of the organic light emitting diode OLED are initialized through the initialization signal terminal VINT, respectively.
In the third period T3, the first scan signal supplied from the first scan line Sn-1 is changed from a low level to a high level, the sixth transistor T6 and the seventh transistor T7 are turned off, and the initialization of the second node N2 and the anode electrode of the organic light emitting diode OLED is stopped.
During a fourth time period (i.e., the threshold voltage compensation and DATA writing period) T4, the second scan signal provided by the second scan line Sn changes from high to low, turning on the first transistor T1 and the third transistor T3, such that the first terminal of the second transistor T2 is electrically connected to the control terminal of the second transistor T2, and the DATA voltage provided by the DATA line DATA is provided to the first node N1 via the first transistor T1.
In the fifth period T5, the second scan signal supplied from the second scan line Sn is changed from the high level to the low level, and the first transistor T1 and the third transistor T3 are turned off;
in a sixth time period (i.e., a light emitting period) T6, the control signal provided by the emission control line EM changes from a high level to a low level, the fourth transistor T4 and the fifth transistor T5 are turned on, and the second transistor T2 is turned on and outputs a current to drive the organic light emitting diode OLED to emit light. At this time, the third transistor T3, the sixth transistor T6, and the seventh transistor T7 are all in an off state.
In one scan cycle, the eighth transistor T8 is in an off state regardless of an initialization phase, a threshold voltage compensation and data writing phase, or a light emitting phase. In the sixth time period T6, the potential of the second node N2 (i.e., the control point of the driving transistor T2) is pulled high by the eighth transistor T8, which improves the leakage current problem.
By adopting the pixel circuit 10 and the driving method thereof provided by the embodiment, the influence of the leakage current on the image display can be reduced, the problems of flicker and bright spots can be avoided even if the refresh frequency is reduced, and the normal display is realized.
Accordingly, the present invention also provides an organic light emitting display device including the pixel circuit 10 as described above. Please refer to the above, which is not described herein.
Preferably, the organic light emitting display device is a wearable device, such as a smart watch or smart glasses.
The figures described above are only schematic representations of the pixel circuits provided by the present invention. For clarity, the shapes and the numbers of the elements in the above figures are simplified and some elements are omitted, and those skilled in the art can make changes according to actual needs, and these changes are all within the protection scope of the present invention and are not described herein again.
In summary, according to the pixel circuit, the driving method thereof and the organic light emitting display device provided by the present invention, the eighth transistor with the gate-source short circuit is disposed between the first power supply and the second node of the pixel circuit, and the eighth transistor is used to pull up the potential of the second node, so as to compensate the leakage current existing in the path where the initialization transistor and the compensation transistor are located, thereby facilitating the reduction of power consumption and the low frequency display.
The foregoing is a more detailed description of the present application in connection with specific preferred embodiments and it is not intended that the present application be limited to these specific details. 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 (9)
1. A pixel circuit, comprising:
an organic light emitting diode;
a first transistor connected between the first node and the data line, and having a control terminal connected to the second scan line;
a second transistor connected between the first node and a third node, a control terminal of which is connected to the second node;
the third transistor is connected between the second node and the third node, and the control end of the third transistor is connected with the second scanning line;
a fourth transistor connected between the first power supply and the first node, a control terminal of which is connected to the emission control line;
a fifth transistor connected between the third node and the anode of the organic light emitting diode, a control terminal of which is connected with the emission control line;
the sixth transistor is connected between the second node and the initialization signal end, and the control end of the sixth transistor is connected with the first scanning line;
the seventh transistor is connected between the initialization signal end and the anode of the organic light-emitting diode, and the control end of the seventh transistor is connected with the first scanning line;
an eighth transistor having a control terminal and a first terminal both connected to the first power supply, and a second terminal connected to the second node; and
a storage capacitor connected between the first power supply and the second node;
and the cathode of the organic light emitting diode is connected with a second power supply.
2. The pixel circuit according to claim 1, wherein the first power supply and the second power supply are used as a driving power supply of the organic light emitting diode, the first power supply is configured to supply a first power supply voltage, the second power supply is configured to supply a second power supply voltage, and the initialization signal terminal is configured to supply an initialization signal.
3. The pixel circuit according to claim 1, wherein the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, and the seventh transistor are P-type thin film transistors.
4. The pixel circuit according to claim 3, wherein the third transistor and the sixth transistor are both double-gate transistors.
5. The pixel circuit according to claim 1, wherein the first transistor functions as a switching transistor for transmitting a data signal to the second terminal of the driving transistor according to the second scan signal;
the second transistor is used as a driving transistor for controlling the driving current provided to the organic light emitting diode according to the potential of the second node;
the fourth transistor and the fifth transistor are both used as light emitting control transistors, the fourth transistor is used for transmitting a first power supply voltage to the first end of the driving transistor according to the light emitting control signal provided by the emission control line, and the fifth transistor is used for transmitting the driving current output by the driving transistor to the organic light emitting diode according to the light emitting control signal provided by the emission control line.
6. The pixel circuit according to claim 1, wherein the third transistor functions as a compensation transistor for electrically connecting the second terminal of the second transistor to the control terminal of the second transistor according to a second scan signal provided by the second scan line;
the sixth transistor is used as an initialization transistor and is used for transmitting an initialization signal provided by the initialization signal terminal to the second node according to a first scanning signal provided by the first scanning line.
7. The pixel circuit according to claim 1, wherein the initialization signal terminal is further configured to provide a reset signal, and the seventh transistor functions as a reset transistor for transmitting the reset signal provided from the initialization signal terminal to the anode of the organic light emitting diode according to the first scan signal provided from the first scan line.
8. A method of driving a pixel circuit, comprising: providing a pixel circuit according to any one of claims 1 to 7, wherein a scanning period of the pixel circuit comprises an initialization phase, a threshold voltage compensation and data writing phase, and a light emitting phase, wherein the threshold voltage compensation and data writing phase is between the initialization phase and the light emitting phase;
in an initialization stage, turning on a sixth transistor and a seventh transistor, transmitting an initialization signal to a second node through the sixth transistor, and simultaneously transmitting the initialization signal to an anode of the organic light emitting diode through the seventh transistor;
in the threshold voltage compensation and data writing stage, the third transistor is opened, and the first end of the second transistor is electrically connected with the control end of the second transistor;
in a light emitting stage, a fourth transistor and a fifth transistor are turned on, at the moment, the third transistor, the sixth transistor and the seventh transistor are all in a closed state, and the second transistor is turned on and drives the light emitting diode to emit light;
wherein the eighth transistor is in an off state throughout the scan period.
9. An organic light emitting display device, comprising: a pixel circuit as claimed in any one of claims 1 to 7.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115565493A (en) * | 2022-11-08 | 2023-01-03 | 上海和辉光电股份有限公司 | Pixel driving circuit, driving method thereof and display device |
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