CN111243501B - Pixel circuit, display device and driving method of pixel circuit - Google Patents
Pixel circuit, display device and driving method of pixel circuit Download PDFInfo
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- CN111243501B CN111243501B CN201811446174.5A CN201811446174A CN111243501B CN 111243501 B CN111243501 B CN 111243501B CN 201811446174 A CN201811446174 A CN 201811446174A CN 111243501 B CN111243501 B CN 111243501B
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- G—PHYSICS
- 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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
Abstract
The embodiment of the invention relates to the field of display and discloses a pixel circuit, a display device and a driving method of the pixel circuit. The pixel circuit includes: a first transistor, a second transistor, a third transistor, a memory device, and a light emitting device; the control end of the first transistor is connected with the scanning line, the first end of the first transistor is connected with the data line, and the second end of the first transistor is connected with the output node; the first end of the memory device is connected with the output node, and the second end of the memory device is connected with the control line; the control end of the second transistor is connected with the output node, the first end of the second transistor is connected with the power supply voltage, and the second end of the second transistor is connected with the anode of the light emitting device; the control terminal of the third transistor is connected with the control terminal of the first transistor, the third transistor is connected with the anode and the cathode of the light emitting device in parallel, and the cathode of the light emitting device is connected with the reference voltage. The control of the luminous brightness of the pixel circuit is improved under the condition that the storage capacitance of the pixel circuit is unchanged.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a pixel circuit, a display device and a driving method of the pixel circuit.
Background
As a current-type Light Emitting device, an Organic Light-Emitting Diode (OLED) has been increasingly used in the field of high-performance display due to its characteristics of self-luminescence, fast response, wide vision, and fabrication on a flexible substrate. The OLEDs can be classified into PMOLEDs (Passive matrix organic light-emitting diode) and AMOLEDs (Active-matrix organic light-emitting diode) according to driving methods. With the rapid development of flat panel display technology, in particular, AMOLED display screens are beginning to be widely applied to electronic display products such as high-end mobile phones and televisions. Micro LEDs are used as a new generation display technology, and compared with the existing OLED technology, the Micro LEDs have the advantages of higher brightness, better luminous efficiency and lower power consumption. Micro LEDs have also become a hotspot in the development of display fields as a solution for future display.
However, the inventors found that there are at least the following problems in the prior art: in high-end display products, the pixel driving circuit generally adopts an active array, however, the main active driving array circuit is driven by analog signals, and the problems of high circuit power consumption, easy signal interference, high consistency of driving devices or high dependence of a compensation circuit and the like exist. The digital driving pixel circuit has the advantages of low power consumption, difficult signal interference, high tolerance to the consistency of driving devices and the like. Because the pixel size is small in the display product with high pixel density, the storage capacitance is too small when the pixel is designed in the digital driving circuit, and the luminous brightness of the luminous device cannot be accurately controlled and adjusted, so that the brightness of the pixel circuit is not uniform.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a pixel circuit, a display device, and a driving method of the pixel circuit, which control luminance of a light emitting device by a driving signal transmitted through a control line in a case where a storage capacitance of the pixel circuit is not changed, thereby improving control of light emission luminance of the pixel circuit.
To solve the above technical problem, an embodiment of the present invention provides a pixel circuit, including: a first transistor, a second transistor, a third transistor, a memory device, and a light emitting device;
the control end of the first transistor is connected with the scanning line, the first end of the first transistor is connected with the data line, and the second end of the first transistor is connected with the output node; the first end of the memory device is connected with the output node, and the second end of the memory device is connected with the control line;
the control end of the second transistor is connected with the output node, the first end of the second transistor is connected with the power supply voltage, and the second end of the second transistor is connected with the anode of the light emitting device;
the control terminal of the third transistor is connected to the control terminal of the first transistor, the first terminal of the third transistor is connected to the anode of the light emitting device, the second terminal of the third transistor is connected to the cathode of the light emitting device, and the cathode of the light emitting device is connected to the reference voltage.
The embodiment of the invention also provides a display device which comprises the pixel circuit.
The embodiment of the invention also provides a driving method of the pixel circuit, which is applied to the pixel circuit, and comprises the following steps:
the first transistor is in a conducting state under the control of a first voltage signal output by the scanning line, and the third transistor is in a conducting state under the control of a first voltage signal output by the scanning line;
the first transistor transmits a data signal output by the data line to the memory device;
the first transistor is in a closed state under the action of a second voltage signal output by the scanning line, and the third transistor is in a closed state under the action of a second voltage signal output by the scanning line;
the second transistor is in a conducting state under the control of an output voltage signal of the memory device, a driving signal output by the control line is transmitted to the second transistor through the memory device, and the second transistor drives the light emitting device according to the driving signal; or the second transistor is in an off state under the control of an output voltage signal of the memory device;
wherein the driving signal includes a driving current and a driving voltage.
Compared with the prior art, the embodiment of the invention has the advantages that the control end of the second transistor is connected with the output node, the storage device acquires the driving signal transmitted by the control line and transmits the driving signal to the control end of the second transistor, the light emitting brightness of the light emitting device is controlled by the second transistor, the light emitting device emits light under the control of the driving signal, the brightness of the light emitting device in the pixel circuit is adjustable, the first end and the second end of the third transistor are connected in parallel with the anode and the cathode of the light emitting device, the state of the third transistor is consistent with the state of the first transistor according to the voltage signal transmitted by the scanning line, the light emitting device is short-circuited in the process of the data signal output by the data line to the storage device, and after the third transistor is in the off state, the brightness of the light emitting device is controlled by the driving signal of the second transistor, so that the uniformity of the pixel circuit is improved, and the display effect of the pixel circuit is improved.
In addition, the first transistor and the third transistor are of the same type.
The first transistor and the third transistor are switching transistors, and the second transistor is a driving transistor.
In this embodiment, the third transistor ensures that the light emitting device does not emit light in the process of controlling the data line of the light emitting device to output the data signal, thereby improving the control of the luminance of the light emitting device.
In addition, if the second transistor is a P-type thin film transistor, the first end of the second transistor is a source electrode, and the second end of the second transistor is a drain electrode.
In addition, the third transistor is in an on state under the control of the first voltage signal output from the scan line, and the light emitting device is in an off state.
In addition, the driving signal is used to control the brightness of the light emitting device.
In addition, if the data signal controls the discharge of the memory device; after the first transistor transmits the data signal output from the data line to the memory device, the driving method of the pixel circuit further includes: the storage device discharges under the control of the data signal, and the storage device stops discharging after the control end of the second transistor is determined to be a low-voltage signal.
In addition, if the data signal controls the storage device to charge; after the first transistor transmits the data signal output from the data line to the memory device, the driving method of the pixel circuit further includes: the storage device is charged under the control of the data signal, and the storage device stops charging after the control end of the second transistor is determined to be a high-voltage signal.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is a schematic diagram of a pixel circuit in a first embodiment of the present invention;
fig. 2 is a block diagram of a pixel circuit in a second embodiment of the present invention;
FIG. 3 is a timing diagram of a pixel circuit at a sub-frame stage according to a second embodiment of the present invention;
fig. 4 is a flowchart of a driving method of a pixel circuit in a third embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present invention, numerous technical details have been set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.
A first embodiment of the present invention relates to a pixel circuit. The structure is shown in fig. 1, and comprises: a first transistor 10, a second transistor 20, a third transistor 30, a memory device 40, and a light emitting device 50.
The control end of the first transistor 10 is connected with the scanning line, the first end of the first transistor 10 is connected with the data line, and the second end of the first transistor 10 is connected with the output node A; a first end of the memory device 40 is connected with the output node A, and a second end of the memory device 40 is connected with the control line; a control terminal of the second transistor 20 is connected to the output node a, a first terminal of the second transistor 20 is connected to the power supply voltage VDD, and a second terminal of the second transistor 20 is connected to an anode of the light emitting device 50; the control terminal of the third transistor 30 is connected to the control terminal of the first transistor 10, the first terminal of the third transistor 30 is connected to the anode of the light emitting device 50, the second terminal of the third transistor 30 is connected to the cathode of the light emitting device 50, and the cathode of the light emitting device 50 is connected to the reference voltage.
It should be noted that, the reference voltage Vcom is a voltage value deflected by the pixel circuit, so as to ensure stable operation of the pixel circuit, and the specific reference voltage value is not limited.
Specifically, the first transistor 10 and the third transistor 30 are the same type of transistor, for example, the first transistor 10 and the third transistor 30 are both P-type thin film transistors, or the first transistor 10 and the third transistor 30 are both N-type thin film transistors. In the present embodiment, the first transistor 10, the second transistor 20, and the third transistor 30 are all P-type thin film transistors, and the pixel circuit in the drawings is described in detail, which is only an example and not a specific limitation. In addition, the light emitting device 50 in this embodiment may be various current driven light emitting devices 50 including LEDs or OLEDs in the prior art, and may be other types of light emitting devices 50, in this embodiment, the OLED is taken as an example to illustrate the working principle of the pixel circuit, and specific implementation details may be adaptively adjusted according to the actually used light emitting device 50, which is not limited herein.
Specifically, the first transistor 10 and the third transistor 30 in the pixel circuit are switching transistors, and the second transistor 20 is a driving transistor.
The switching transistor is in a turned-on or turned-off state under the action of a voltage signal at a control end, the control end of the second transistor 20 is connected to the output node a, a driving signal transmitted by the memory device 40 is obtained through the output node a, and the control line transmits the output driving signal to the second transistor 20 through the memory device 40. During the light emission of the light emitting device 50, the second transistor 20 is a driving tube, and the brightness of the light emitting device 50 is controlled by a driving signal. In the embodiment shown in fig. 1, the first transistor 10, the second transistor 20 and the third transistor 30 are P-type thin film transistors, the control terminal of the first transistor 10 is connected with a scan line, the gate is connected with the scan line, the source or the drain is connected with a data line, the voltage of the control terminal can control the state of the first transistor 10, and the specific connection relationship is not limited; the control end of the third transistor 30 is connected with the control end of the first transistor 10, the voltage signal transmitted by the scanning line is in an on or off state, the gate of the third transistor 30 is connected with the scanning line, and the source and the drain are connected in parallel with the anode and the cathode of the light emitting device 50; the second transistor 20 is a driving tube, the gate is connected to the output node a, the source is connected to the power supply voltage, and the drain is connected to the anode of the light emitting device 50. The circuit connections herein are exemplary only and are not limiting in any way.
In a specific implementation, the pixel circuit is driven, and in one light emission period, a data writing period and a light emission period are included. In the pixel circuit driven by the digital signal, the digital signal "1" indicates that the light emitting device 50 emits light in the light emitting period, and the digital signal "0" indicates that the light emitting device 50 does not emit light in the light emitting period. The data writing phase and the light emitting phase are included for each of the digital signals "1" or "0", specifically, the light emitting device 50 in the light emitting phase is in the light emitting state in the digital signal "1", and the light emitting device 50 in the light emitting phase is in the light off state in the digital signal "0".
In one embodiment, taking a pixel circuit manufactured by low temperature polysilicon (LTPS, low Temperature Poly-silicon) technology as an example, the second transistor 20 is a P-type thin film transistor, and in the digital signal "1", the data writing stage: the scan line transmits a voltage signal to the first transistor 10 and the third transistor 30, the first transistor 10 and the third transistor 30 are both in an on state, the data line transmits a data signal to the memory device 40, the memory device 40 discharges to a low voltage under the control of the data signal, the output node is made to be a low voltage, the data signal is stored in the memory device 40, the control end of the second transistor 20 is connected with the output node, and is in an on state under the control of the low voltage; and (3) a light-emitting stage: the voltage signal output by the scan line is a high voltage signal, the first transistor 10 and the third transistor 30 are both in an off state, and the second transistor 20 receives a driving signal transmitted by the control line through the output node and transmits the driving signal to the light emitting device 50, thereby controlling the brightness of the light emitting device 50.
Digital signal "0", data writing phase: the data line transmits a data signal to the memory device 40, the memory device 40 charges to a high voltage of the output node, and stores the data signal in the memory device 40, the second transistor 20 is in an off state under the effect of the high voltage signal of the output node, and the light emitting phase: the scan line output voltage signal is a high voltage signal, the first transistor 10 and the third transistor 30 are both in an off state, the output node is a high voltage, the second transistor 20 is in an off state, and the light emitting device 50 does not emit light under the control of the driving signal.
It should be noted that, in this embodiment, the second transistor 20 is a driving tube, the control end of the second transistor 20 is connected to the first end of the memory device 40, the control line is connected to the second end of the memory device 40, the driving signal is transmitted to the second transistor 20 through the memory device 40, and the brightness of the light emitting device 50 is controlled in the light emitting stage, so that the pixel circuit can control the brightness uniformity of the light emitting device 50 under the condition that the capacity of the memory device 40 is limited.
The foregoing is merely illustrative, and is not intended to limit the technical aspects of the present invention.
Compared with the prior art, the control end of the second transistor is connected with the output node, the storage device acquires the driving signal transmitted by the control line and transmits the driving signal to the control end of the second transistor, the second transistor is used for controlling the light-emitting brightness of the light-emitting device, so that the light-emitting device emits light under the control of the driving signal, the brightness of the light-emitting device in the pixel circuit can be adjusted, the first end and the second end of the third transistor are connected in parallel with the anode and the cathode of the light-emitting device, the state of the third transistor is consistent with the state of the first transistor according to the voltage signal transmitted by the scanning line, the light-emitting device is short-circuited in the process of the data signal output by the data line to the storage device, and after the third transistor is in the closed state, the brightness of the light-emitting device is controlled by the driving signal of the second transistor, so that the uniformity of the pixel circuit is improved, and the display effect of the pixel circuit is improved.
A second embodiment of the present invention relates to a pixel circuit, which is substantially the same as the first embodiment, and is mainly different in that: in the second embodiment of the present invention, a structure of a pixel circuit is specifically given as shown in fig. 2.
The first transistor T1, the second transistor T2, and the third transistor T3 are P-type thin film transistors, the light emitting device is an OLED, and the memory device is a capacitor element C1.
In one embodiment, in a sub-frame period, specifically, a frame of picture is divided into a plurality of sub-frames in time, each sub-frame corresponds to a respective scanning time, and data writing is performed first in a scanning stage and then the brightness of the light emitting device is controlled through the driving transistor. As shown in fig. 3, a voltage change in one sub-frame period in which SEL in fig. 3 represents a voltage signal output from a scan line and DATA represents written DATA is illustrated. In the state of the digital signal "1", the scan line transmits a low voltage signal to the first transistor T1, the first transistor T1 is in an on state, the data line transmits a data signal to the storage capacitor C1, meanwhile, the control end of the third transistor T3 is connected to the scan line, the third transistor T3 is in an on state, the on state of the third transistor T3 causes the light emitting device OLED to be shorted, which means that in the data writing stage, the third transistor T3 is in an on state, and the light emitting device does not emit light; in the light emitting stage, the scanning line transmits a high voltage signal to the first transistor T1, the first transistor T1 is in an off state, the third transistor T3 is also in an off state under the control of the voltage signal of the scanning line, vctrl is in a low voltage state, the second end of the storage capacitor C1 is in a low voltage state, the second transistor T2 is in an on state, a driving signal output by Vctrl is transmitted to the second transistor T2 through the storage capacitor C1, the second transistor T2 transmits the driving signal to the light emitting device, and the brightness of the light emitting device is controlled.
Wherein the driving signal is used to control the brightness of the light emitting device.
Specifically, in the circuit shown in fig. 2, the second transistor T2 operates in the saturation region, and the voltage Vgs between the gate and the source of the second transistor T2 is related to the power supply voltages VDD and Vctrl, where VDD is preset, and Vctrl is used to control the brightness of the light emitting device, so that the uniformity of the brightness of the pixel circuit on the entire control panel can be ensured.
It should be noted that, the time of each sub-frame in the pixel circuit may be different, for example, when the pixel circuit displays a frame, the frame may be divided into a plurality of sub-frames in time, and each sub-frame is scanned at 1t, 1/2t, 1/4t, and 1/8t …, and t represents the total scanning time of the frame, in one specific implementation, when the gray level of the frame reaches 256, 8 sub-frames are needed, and the time of the 8 th sub-frame is 1/128t.
The foregoing is merely illustrative, and is not intended to limit the technical aspects of the present invention.
A third embodiment of the present invention relates to a method for driving a pixel circuit, which is applied to the pixel circuit in the first or second embodiment, and the flow of the method for driving the pixel circuit is as shown in fig. 4, and includes the following implementation steps:
step 401: the first transistor is in a conductive state under the control of a first voltage signal output by the scan line, and the third transistor is in a conductive state under the control of a first voltage signal output by the scan line.
Specifically, the first voltage needs to be set according to the type of the first transistor in the pixel circuit, and only the first voltage signal is described herein to control the first transistor to be in a corresponding state, specifically according to the device setting in the pixel circuit, which is not limited herein.
Step 402: the first transistor transmits a data signal output from the data line to the memory device.
Specifically, in the process that the first transistor transmits the data signal output by the data line to the storage capacitor, the data signal contains digital information, the data signal controls the storage capacitor to charge or discharge, and after the charge or discharge is completed, the first transistor is controlled to be turned off.
Step 403: the first transistor is in an off state under the action of a second voltage signal output by the scanning line, and the third transistor is in an off state under the action of a second voltage signal output by the scanning line.
Step 404: whether the data signal controls the storage capacitor to discharge is judged, if yes, step 405 is executed, otherwise step 406 is executed.
Step 405: the second transistor is in a conductive state under control of an output voltage signal of the memory device, and transmits a driving signal output from the control line to the second transistor through the memory device, and the second transistor drives the light emitting device according to the driving signal.
Wherein the driving signal includes a driving current and a driving voltage.
Specifically, the driving signals include a driving current and a driving voltage, different driving signals are set according to characteristics of the light emitting device, the current-driven light emitting device sets the driving signal as the driving current, and the voltage-driven light emitting device sets the driving signal as the driving voltage.
In one embodiment, the data signal controls the storage capacitor to discharge, and the storage capacitor stops discharging after determining that the control terminal of the second transistor is a low voltage signal.
Step 406: the second transistor is in an off state under the control of an output voltage signal of the memory device.
Specifically, the data signal controls the storage capacitor to charge, and the storage capacitor stops charging after determining that the control end of the second transistor is a high-voltage signal.
The above steps of the methods are divided, for clarity of description, and may be combined into one step or split into multiple steps when implemented, so long as they include the same logic relationship, and they are all within the protection scope of this patent; it is within the scope of this patent to add insignificant modifications to the algorithm or flow or introduce insignificant designs, but not to alter the core design of its algorithm and flow.
It is to be noted that this embodiment is an example of a driving method corresponding to the first or second embodiment, and can be implemented in cooperation with the first or second embodiment. The related technical details mentioned in the first or second embodiment are still valid in this embodiment, and in order to reduce repetition, a detailed description is omitted here. Accordingly, the related art details mentioned in the present embodiment can also be applied to the first or second embodiment.
A third embodiment of the present invention relates to a display device including the pixel circuit in the first or second embodiment.
Specifically, the pixel circuits on the display device are all disposed on the control panel, and the arrangement of the specific pixel circuits is not particularly limited, and the display device includes at least one pixel circuit for displaying by the display device.
In one specific implementation, taking the pixel circuit in fig. 2 as an example, the second transistor T2 is connected to the power supply voltage VDD, and the driving voltage between the gate and the source of the second transistor is expressed as: vgs=vdd-Vctrl; where Vgs represents the driving voltage of the second transistor, VDD represents the power supply voltage, and Vctrl represents the voltage value transmitted from the control terminal. In the specific implementation, the influence of the circuit layout or the pixel circuit structure layout in the layout design on VDD and Vctrl is reduced by designing the layout in the pixel circuit, so that the brightness uniformity of the pixel circuit on a control panel in the display device is ensured.
It is to be noted that this embodiment is an example of the apparatus corresponding to the first or second embodiment, and can be implemented in cooperation with the first or second embodiment. The related technical details mentioned in the first or second embodiment are still valid in this embodiment, and in order to reduce repetition, a detailed description is omitted here. Accordingly, the related art details mentioned in the present embodiment can also be applied to the first or second embodiment.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the invention and that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A pixel circuit, comprising: a first transistor, a second transistor, a third transistor, a memory device, and a light emitting device;
the control end of the first transistor is connected with the scanning line, the first end of the first transistor is connected with the data line, and the second end of the first transistor is connected with the output node; the first end of the storage device is connected with the output node, and the second end of the storage device is connected with a control line;
the control end of the second transistor is connected with the output node, the first end of the second transistor is connected with the power supply voltage, and the second end of the second transistor is connected with the anode of the light emitting device;
the control end of the third transistor is connected with the control end of the first transistor, the first end of the third transistor is connected with the anode of the light emitting device, the second end of the third transistor is connected with the cathode of the light emitting device, and the cathode of the light emitting device is connected with a reference voltage;
the control end of the second transistor is connected with the first end of the storage device, the second transistor receives a driving signal transmitted by the storage device through the output node, and the brightness of the light emitting device is controlled in a light emitting stage;
the second end of the storage device is not connected with the power supply voltage, and the storage device transmits the driving signal transmitted by the control line.
2. The pixel circuit according to claim 1, wherein the first transistor and the third transistor are of the same type.
3. A pixel circuit according to any one of claims 1 to 2, wherein the first transistor and the third transistor are switching transistors and the second transistor is a driving transistor.
4. A pixel circuit according to claim 3, wherein if the second transistor is a P-type thin film transistor, the first terminal of the second transistor is a source and the second terminal of the second transistor is a drain.
5. A display device comprising a pixel circuit as claimed in any one of claims 1 to 4.
6. A driving method of a pixel circuit, which is applied to the pixel circuit according to any one of claims 1 to 4, characterized in that the driving method of the pixel circuit comprises:
the first transistor is in a conducting state under the control of a first voltage signal output by the scanning line, and the third transistor is in a conducting state under the control of the first voltage signal output by the scanning line;
the first transistor transmits a data signal output by the data line to the memory device;
the first transistor is in a closed state under the action of a second voltage signal output by the scanning line, and the third transistor is in a closed state under the action of the second voltage signal output by the scanning line;
the second transistor is in a conducting state under the control of an output voltage signal of the storage device, a driving signal output by a control line is transmitted to the second transistor through the storage device, and the second transistor drives the light emitting device according to the driving signal; or the second transistor is in a closed state under the control of an output voltage signal of the memory device;
wherein the driving signal includes a driving current and a driving voltage.
7. The method according to claim 6, wherein the third transistor is in an on state under control of the first voltage signal output from the scanning line, and the light emitting device is in an off state.
8. The driving method of a pixel circuit according to claim 6, wherein the driving signal is used to control luminance of the light emitting device.
9. A driving method of a pixel circuit according to any one of claims 6 to 8, wherein if the data signal controls the discharge of the memory device;
after the first transistor transmits the data signal output by the data line to the memory device, the driving method of the pixel circuit further includes:
and the storage device discharges under the control of the data signal, and the storage device stops discharging after the control end of the second transistor is determined to be a low-voltage signal.
10. A driving method of a pixel circuit according to any one of claims 6 to 8, wherein if the data signal controls the memory device to be charged;
after the first transistor transmits the data signal output by the data line to the memory device, the driving method of the pixel circuit further includes:
and the storage device is charged under the control of the data signal, and the storage device stops charging after the control end of the second transistor is determined to be a high-voltage signal.
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| CN102832229B (en) * | 2012-08-31 | 2014-12-10 | 京东方科技集团股份有限公司 | Pixel circuit, driving method and display device of light emitting device |
| CN202855269U (en) * | 2012-11-08 | 2013-04-03 | 京东方科技集团股份有限公司 | Pixel circuit and display device |
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| CN106981269B (en) * | 2017-06-05 | 2018-12-14 | 京东方科技集团股份有限公司 | A kind of pixel circuit and its driving method, display panel and display device |
| CN107833559B (en) * | 2017-12-08 | 2023-11-28 | 合肥京东方光电科技有限公司 | Pixel driving circuit, organic light emitting display panel and pixel driving method |
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