CN110544459A - pixel circuit, driving method thereof and display device - Google Patents
pixel circuit, driving method thereof and display device Download PDFInfo
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- CN110544459A CN110544459A CN201910850678.1A CN201910850678A CN110544459A CN 110544459 A CN110544459 A CN 110544459A CN 201910850678 A CN201910850678 A CN 201910850678A CN 110544459 A CN110544459 A CN 110544459A
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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]
- G09G3/3225—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] using an active matrix
- G09G3/3233—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] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
A pixel circuit, a driving method thereof and a display device, the pixel circuit includes: the organic light emitting diode driving circuit comprises a first switch circuit, a second switch circuit, a third switch circuit, a fourth switch circuit, a fifth switch circuit, a driving switch circuit, a first capacitor, a second capacitor and an organic light emitting diode. The pixel circuit controls the first switch circuit, the second switch circuit, the third switch circuit and the fourth switch circuit to be conducted at the first time sequence, inputs a first preset voltage through the data signal line, controls the first switch circuit, the second switch circuit and the third switch circuit to be conducted at the second time sequence, inputs the first preset voltage through the data signal line, controls the second switch circuit and the third switch circuit to be conducted at the third time sequence, inputs a second preset voltage through the data signal line, and controls the first switch circuit, the second switch circuit and the third switch circuit to be conducted at the fourth time sequence, so that the problems of abnormity of the display device and uneven display of the organic light emitting diodes at different positions are solved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a pixel circuit, a driving method thereof, and a display device.
background
Compared with a liquid crystal display device, an Organic Light Emitting Diode (OLED) display device has the advantages of self-luminescence, wide viewing angle, high contrast, fast response speed, and the like. In the organic light emitting diode display device, the organic light emitting diode displays different luminance according to the magnitude of a driving current flowing through the organic light emitting diode, and the driving current is generated by a driving transistor in a pixel unit according to a received data voltage. Therefore, the voltage level variation of each terminal of the driving transistor directly affects the display frame.
Because the threshold voltage Vth of the transistor at each position in the OLED display device is different and affects the display image, the pixel circuit needs to compensate the received data voltage and then control the pixel circuit to generate the driving current, thereby ensuring that the driving current is independent of Vth and ensuring that the display device is not affected by Vth and affects the display image.
The driving transistor in the existing OLED display device can adopt either a P-type transistor or an N-type transistor, and when a P-type transistor is adopted, the threshold voltage Vth of the P-type transistor is ideally a negative value, but due to process instability, the Vth shift range of the P-type transistor may be large and even reach a positive value, and the pixel circuit in the existing display device can only compensate the threshold voltage of the negative value, and cannot compensate the threshold voltage of the positive value, thereby causing abnormal display of the display device.
Disclosure of Invention
In view of the above, it is necessary to provide a pixel circuit, a driving method thereof, and a display device, which are capable of compensating only a negative threshold voltage and not a positive threshold voltage in a conventional display device, and thus cause display abnormality in the display device.
A pixel circuit, comprising: the driving circuit comprises a first switch circuit, a second switch circuit, a third switch circuit, a fourth switch circuit, a fifth switch circuit, a driving switch circuit, a first capacitor, a second capacitor and an organic light emitting diode;
the control end of the first switch circuit is used for being connected with a reset signal line, the first end of the first switch circuit is used for being connected with a first reference voltage signal line, and the second end of the first switch circuit is connected with the first end of the driving switch circuit;
The control end of the second switch circuit is used for being connected with a scanning signal line, the first end of the second switch circuit is used for being connected with a second reference voltage signal line, and the second end of the second switch circuit is connected with the control end of the driving switch circuit;
The control end of the third switch circuit is used for being connected with the scanning signal line, the first end of the third switch circuit is used for being connected with the data signal line, and the second end of the third switch circuit is connected with the first end of the second capacitor;
The control end of the fourth switch circuit is used for being connected with an enabling signal line, the first end of the fourth switch circuit is used for being connected with a power signal line, the second end of the fourth switch circuit is connected with the second end of the driving switch circuit, and the second end of the fourth switch circuit is further connected with the second end of the second capacitor;
The second end of the second capacitor is also connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the control end of the driving switch circuit;
the control end of the fifth switch circuit is used for being connected with the enabling signal line, the first end of the fifth switch circuit is connected with the first end of the driving switch circuit, the second end of the fifth switch circuit is connected with the anode of the organic light-emitting diode, and the cathode of the organic light-emitting diode is used for being connected with the common voltage signal line.
In one embodiment, the first reference voltage signal line is further included and is used for being connected with the common voltage signal line.
in one embodiment, the first switch circuit is a first transistor, the control terminal of the first switch circuit is the control electrode of the first transistor, the first terminal of the first switch circuit is the first electrode of the first transistor, and the second terminal of the first switch circuit is the second electrode of the first transistor.
In one embodiment, the second switch circuit is a second transistor, the control terminal of the second switch circuit is a control electrode of the second transistor, the first terminal of the second switch circuit is a first electrode of the second transistor, and the second terminal of the second switch circuit is a second electrode of the second transistor.
In one embodiment, the third switch circuit is a third transistor, the control terminal of the third switch circuit is the control electrode of the third transistor, the first terminal of the third switch circuit is the first electrode of the third transistor, and the second terminal of the third switch circuit is the second electrode of the third transistor.
in one embodiment, the fourth switch circuit is a fourth transistor, the control terminal of the fourth switch circuit is the control electrode of the fourth transistor, the first terminal of the fourth switch circuit is the first electrode of the fourth transistor, and the second terminal of the fourth switch circuit is the second electrode of the fourth transistor.
in one embodiment, the fifth switch circuit is a fifth transistor, the control terminal of the fifth switch circuit is the control electrode of the fifth transistor, the first terminal of the fifth switch circuit is the first electrode of the fifth transistor, and the second terminal of the fifth switch circuit is the second electrode of the fifth transistor.
In one embodiment, the driving switch circuit is a driving transistor, the control terminal of the driving switch circuit is the control electrode of the driving transistor, the first terminal of the driving switch circuit is the first electrode of the driving transistor, and the second terminal of the driving switch circuit is the second electrode of the driving transistor.
A driving method of a pixel circuit for driving the pixel circuit according to any one of the above embodiments, the driving method comprising:
Inputting a turn-on signal through the reset signal line to turn on the first switch circuit in a first timing; inputting a turn-on signal through the scanning signal line to turn on the second switch circuit and the third switch circuit; inputting a turn-on signal through the enable signal line to turn on the fourth and fifth switching circuits; inputting a first preset voltage through the data signal line;
Inputting a turn-on signal through the reset signal line to turn on the first switch circuit in a second timing; inputting a turn-on signal through the scanning signal line to turn on the second switch circuit and the third switch circuit; inputting a turn-off signal through the enable signal line to turn off the fourth and fifth switching circuits; inputting a first preset voltage through the data signal line;
in a third timing, a turn-off signal is input through the reset signal line to turn off the first switch circuit; inputting a turn-on signal through the scanning signal line to turn on the second switch circuit and the third switch circuit; inputting a turn-off signal through the enable signal line to turn off the fourth and fifth switching circuits; inputting a second preset voltage through the data signal line, wherein the second preset voltage is greater than the first preset voltage;
In a fourth timing, a turn-off signal is input through the reset signal line to turn off the first switch circuit; inputting a turn-off signal through the scanning signal line to turn off the second switch circuit and the third switch circuit; a turn-on signal is input through the enable signal line to turn on the fourth and fifth switch circuits.
A display device comprising a reset signal line, a first reference voltage signal line, a scan signal line, a second reference voltage signal line, a data signal line, an enable signal line, a power signal line, a common voltage signal line, and the pixel circuit described in any of the above embodiments;
the reset signal line is connected to a control terminal of the first switch circuit, the first reference voltage line is connected to a first terminal of the first switch circuit, the scan signal line is connected to a control terminal of the second switch circuit and a control terminal of the third switch circuit, respectively, the second reference voltage signal line is connected to a first terminal of the second switch circuit, the data signal line is connected to a first terminal of the third switch circuit, the enable signal line is connected to a control terminal of the fourth switch circuit and a control terminal of the fifth switch circuit, respectively, the power signal line is connected to a first terminal of the fourth switch circuit, and the common voltage signal line is connected to a cathode of the organic light emitting diode.
the pixel circuit, the driving method thereof and the display device control the first switch circuit, the second switch circuit, the third switch circuit, the fourth switch circuit and the fifth switch circuit to be turned on at a first timing, and input a first preset voltage through the data signal line, control the first switch circuit, the second switch circuit and the third switch circuit to be turned on at a second timing, the fourth switch circuit and the fifth switch circuit to be turned off, and input the first preset voltage through the data signal line, control the second switch circuit and the third switch circuit to be turned on at a third timing, turn off the first switch circuit, the fourth switch circuit and the fifth switch circuit, and input a second preset voltage through the data signal line, wherein the second preset voltage is greater than the first preset voltage, control the first switch circuit, the second switch circuit and the third switch circuit to be turned on at a fourth timing, turn off the fourth switch circuit and the fifth switch circuit, therefore, when the driving switch circuit drives the organic light emitting diode to emit light, the driving current of the driving switch circuit in the pixel circuit is irrelevant to the threshold voltage Vth, namely, the influence of the threshold voltage Vth on the driving current can be compensated no matter whether the threshold voltage Vth is a positive value or a negative value, the abnormity of the display device is avoided, and the driving current is also irrelevant to the voltage input by the power signal line, so that the problem of uneven display of the organic light emitting diode at different positions is avoided.
Drawings
FIG. 1 is a circuit schematic of a pixel circuit in one embodiment;
FIG. 2 is a timing diagram of a pixel circuit according to one embodiment;
Fig. 3 is a flowchart of a driving method of a pixel circuit in one embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention 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.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In one embodiment, the present application provides a pixel circuit comprising: the driving circuit comprises a first switch circuit, a second switch circuit, a third switch circuit, a fourth switch circuit, a fifth switch circuit, a driving switch circuit, a first capacitor, a second capacitor and an organic light emitting diode; the control end of the first switch circuit is used for being connected with a reset signal line, the first end of the first switch circuit is used for being connected with a first reference voltage signal line, and the second end of the first switch circuit is connected with the first end of the driving switch circuit; the control end of the second switch circuit is used for being connected with a scanning signal line, the first end of the second switch circuit is used for being connected with a second reference voltage signal line, and the second end of the second switch circuit is connected with the control end of the driving switch circuit; the control end of the third switch circuit is used for being connected with the scanning signal line, the first end of the third switch circuit is used for being connected with the data signal line, and the second end of the third switch circuit is connected with the first end of the second capacitor; the control end of the fourth switch circuit is used for being connected with an enabling signal line, the first end of the fourth switch circuit is used for being connected with a power signal line, the second end of the fourth switch circuit is connected with the second end of the driving switch circuit, and the second end of the fourth switch circuit is further connected with the second end of the second capacitor; the second end of the second capacitor is also connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the control end of the driving switch circuit; the control end of the fifth switch circuit is used for being connected with the enabling signal line, the first end of the fifth switch circuit is connected with the first end of the driving switch circuit, the second end of the fifth switch circuit is connected with the anode of the organic light-emitting diode, and the cathode of the organic light-emitting diode is used for being connected with the common voltage signal line.
The pixel circuit controls the first switch circuit, the second switch circuit, the third switch circuit, the fourth switch circuit and the fifth switch circuit to be switched on at a first timing, inputs a first preset voltage through the data signal line, controls the first switch circuit, the second switch circuit and the third switch circuit to be switched on at a second timing, switches the fourth switch circuit and the fifth switch circuit to be switched off, inputs the first preset voltage through the data signal line, controls the second switch circuit and the third switch circuit to be switched on at a third timing, switches the first switch circuit, the fourth switch circuit and the fifth switch circuit to be switched off, and inputs a second preset voltage through the data signal line, wherein the second preset voltage is larger than the first preset voltage, controls the first switch circuit, the second switch circuit and the third switch circuit to be switched on at the fourth timing, and switches the fourth switch circuit and the fifth switch circuit to be switched off, therefore, when the driving switch circuit drives the organic light emitting diode to emit light, the driving current of the driving switch circuit in the pixel circuit is irrelevant to the threshold voltage Vth, namely, the influence of the threshold voltage Vth on the driving current can be compensated no matter whether the threshold voltage Vth is a positive value or a negative value, the abnormity of the display device is avoided, and the driving current is also irrelevant to the voltage input by the power signal line, so that the problem of uneven display of the organic light emitting diode at different positions is avoided.
In order to facilitate understanding of the pixel circuit of the present application, the present application is further described below with reference to the accompanying drawings.
referring to fig. 1, in one example, a pixel circuit 10 includes: the organic light emitting diode OLED driving circuit comprises a first switch circuit 100, a second switch circuit 200, a third switch circuit 300, a fourth switch circuit 400, a fifth switch circuit 500, a driving switch circuit 600, a first capacitor C1, a second capacitor C2 and an organic light emitting diode OLED.
the control terminal of the first switch circuit 100 is configured to be connected to a RESET signal line RESET, the first terminal of the first switch circuit 100 is configured to be connected to a first reference voltage signal line VREF1, and the second terminal of the first switch circuit 100 is connected to the first terminal of the driving switch circuit 600.
The control terminal of the second switch circuit 200 is configured to be connected to the SCAN signal line SCAN, the first terminal of the second switch circuit 200 is configured to be connected to the second reference voltage signal line VREF2, and the second terminal of the second switch circuit 200 is connected to the control terminal of the driving switch circuit 600.
a control terminal of the third switch circuit 300 is configured to be connected to the SCAN signal line SCAN, a first terminal of the third switch circuit 300 is configured to be connected to the DATA signal line DATA, and a second terminal of the third switch circuit 300 is connected to a first terminal of the second capacitor C2.
the control terminal of the fourth switch circuit 400 is configured to be connected to the enable signal line EM, the first terminal of the fourth switch circuit 400 is configured to be connected to the power signal line VDD, the second terminal of the fourth switch circuit 400 is connected to the second terminal of the driving switch circuit 600, and the second terminal of the fourth switch circuit 400 is further connected to the second terminal of the second capacitor C2.
The second terminal of the second capacitor C2 is further connected to the first terminal of the first capacitor C1, and the second terminal of the first capacitor C1 is connected to the control terminal of the driving switch circuit 600.
The control end of the fifth switch circuit 500 is configured to be connected to the enable signal line EM, the first end of the fifth switch circuit 500 is connected to the first end of the driving switch circuit 600, the second end of the fifth switch circuit 500 is connected to the anode of the organic light emitting diode OLED, and the cathode of the organic light emitting diode OLED is configured to be connected to the common voltage signal line VSS.
Specifically, the RESET signal line RESET is used to transmit a RESET signal to the first switch circuit 100 to control the first switch circuit 100 to be turned on or off. The first reference voltage signal line VREF1 is used to provide a voltage to the organic light emitting diode OLED when the first switch circuit 100 and the fifth switch circuit 500 are both turned on, so that the anode of the organic light emitting diode OLED is reset. The SCAN signal line SCAN is used to transmit a SCAN signal to the second switch circuit 200 and the third switch circuit 300 to control the second switch circuit 200 and the third switch circuit 300 to be turned on or off. The second reference voltage signal line VREF2 is used to provide voltage to the control terminal of the driving switch circuit 600 when the second switch circuit 200 is turned on. The DATA signal line DATA is used to provide a voltage to the first capacitor C1 and the second capacitor C2 when the third switch circuit 300 is turned on, so as to charge the first capacitor C1 and the second capacitor C2. The enable signal line EM is used to transmit an enable signal to the fourth switching circuit 400 and the fifth switching circuit 500 to control the fourth switching circuit 400 and the fifth switching circuit 500 to be turned on or off. The power signal line VDD is used to provide a voltage to the second terminal of the driving switch circuit 600 when the fourth switch circuit 400 is turned on. The common voltage signal line VSS is used to provide a common voltage to the cathode of the organic light emitting diode OLED.
specifically, the switching circuit of the present application corresponds to a control switch, for example: the driving switch circuit 600, the first switch circuit 100, the second switch circuit 200, the third switch circuit 300, the fourth switch circuit 400, the fifth switch circuit 500, and the like collectively correspond to a control switch as a whole, and when the control terminal of the switch circuit receives an on signal, the first terminal and the second terminal of the switch circuit may be turned on, and when the control terminal of the switch circuit receives an off signal, the first terminal and the second terminal of the switch circuit may be turned off. In one embodiment, the switch circuit is a transistor, the control terminal of the switch circuit is the control electrode of the transistor, the first terminal of the switch circuit is the first electrode of the transistor, and the second terminal of the switch circuit is the second electrode of the transistor. Further, the control electrode of the transistor is a gate, the first electrode of the transistor is a source, and the second electrode of the transistor is a drain; or, the control electrode of the transistor is a grid electrode, the first electrode of the transistor is a drain electrode, and the second electrode of the transistor is a source electrode.
In one embodiment, referring to fig. 1 again, the first switch circuit 100 is a first transistor T1, the control terminal of the first switch circuit 100 is the control electrode of the first transistor T1, the first terminal of the first switch circuit 100 is the first electrode of the first transistor T1, and the second terminal of the first switch circuit 100 is the second electrode of the first transistor T1. Thus, when the control electrode of the first transistor T1 receives the turn-on signal, the first and second electrodes of the first transistor T1 may be turned on, and when the control electrode of the first transistor T1 receives the turn-off signal, the first and second electrodes of the first transistor T1 may be turned off.
In one embodiment, referring to fig. 1 again, the second switch circuit 200 is a second transistor T2, the control terminal of the second switch circuit 200 is the control electrode of the second transistor T2, the first terminal of the second switch circuit 200 is the first electrode of the second transistor T2, and the second terminal of the second switch circuit 200 is the second electrode of the second transistor T2. Thus, when the control electrode of the second transistor T2 receives the turn-on signal, the first and second electrodes of the second transistor T2 may be turned on, and when the control electrode of the second transistor T2 receives the turn-off signal, the first and second electrodes of the second transistor T2 may be turned off.
In one embodiment, referring to fig. 1 again, the third switch circuit 300 is a third transistor T3, the control terminal of the third switch circuit 300 is the control electrode of the third transistor T3, the first terminal of the third switch circuit 300 is the first electrode of the third transistor T3, and the second terminal of the third switch circuit 300 is the second electrode of the third transistor T3. In this way, when the control electrode of the third transistor T3 receives the turn-on signal, the first and second electrodes of the third transistor T3 may be turned on, and when the control electrode of the third transistor T3 receives the turn-off signal, the first and second electrodes of the third transistor T3 may be turned off.
In one embodiment, referring to fig. 1 again, the fourth switch circuit 400 is a fourth transistor T4, the control terminal of the fourth switch circuit 400 is the control electrode of the fourth transistor T4, the first terminal of the fourth switch circuit 400 is the first electrode of the fourth transistor T4, and the second terminal of the fourth switch circuit 400 is the second electrode of the fourth transistor T4. Thus, when the gate of the fourth transistor T4 receives the turn-on signal, the first and second electrodes of the fourth transistor T4 may be turned on, and when the gate of the fourth transistor T4 receives the turn-off signal, the first and second electrodes of the fourth transistor T4 may be turned off.
In one embodiment, referring to fig. 1 again, the fifth switch circuit 500 is a fifth transistor T5, the control terminal of the fifth switch circuit 500 is the control electrode of the fifth transistor T5, the first terminal of the fifth switch circuit 500 is the first electrode of the fifth transistor T5, and the second terminal of the fifth switch circuit 500 is the second electrode of the fifth transistor T5. In this way, when the control electrode of the fifth transistor T5 receives the turn-on signal, the first and second electrodes of the fifth transistor T5 may be turned on, and when the control electrode of the fifth transistor T5 receives the turn-off signal, the first and second electrodes of the fifth transistor T5 may be turned off.
In one embodiment, referring to fig. 1 again, the driving switch circuit 600 is a driving transistor TD, the control terminal of the driving switch circuit 600 is the control electrode of the driving transistor TD, the first terminal of the driving switch circuit 600 is the first electrode of the driving transistor TD, and the second terminal of the driving switch circuit 600 is the second electrode of the driving transistor TD. In this way, when the control electrode of the driving transistor TD receives the on signal, the first electrode and the second electrode of the driving transistor TD can be turned on, and when the control electrode of the driving transistor TD receives the off signal, the first electrode and the second electrode of the driving transistor TD can be turned off and turned on.
To reduce power usage, in one embodiment, the pixel circuit further includes the first reference voltage signal line VREF1, the first reference voltage signal line VREF1 for connection to the common voltage signal line VSS. By connecting the first reference voltage signal line VREF1 with the common voltage signal line VSS, the first reference voltage signal line VREF1 and the common voltage signal line VSS can be signaled using the same power source, reducing the use of power sources.
Referring to fig. 1 to fig. 3, in one embodiment, the present application provides a driving method of a pixel circuit, for driving the pixel circuit according to any of the above embodiments, the driving method includes:
S110: in a first timing t1, a turn-on signal is input through the RESET signal line RESET to turn on the first switch circuit 100; inputting a turn-on signal through the SCAN signal line SCAN to turn on the second and third switch circuits 200 and 300; inputting a turn-on signal through the enable signal line EM to turn on the fourth and fifth switching circuits 400 and 500; inputting a first preset voltage VREFD through the DATA signal line DATA;
s120: in a second timing t2, a turn-on signal is input through the RESET signal line RESET to turn on the first switch circuit 100; inputting a turn-on signal through the SCAN signal line SCAN to turn on the second and third switch circuits 200 and 300; inputting a turn-off signal through the enable signal line EM to turn off the fourth and fifth switching circuits 400 and 500; inputting a first preset voltage VREFD through the DATA signal line DATA;
S130: in a third timing t3, a turn-off signal is input through the RESET signal line RESET to turn off the first switch circuit 100; inputting a turn-on signal through the SCAN signal line SCAN to turn on the second and third switch circuits 200 and 300; inputting a turn-off signal through the enable signal line EM to turn off the fourth and fifth switching circuits 400 and 500; inputting a second preset voltage VDATA through the DATA signal line DATA, wherein the second preset voltage VDATA is greater than the first preset voltage VREFD;
s140: in a fourth timing t4, a turn-off signal is input through the RESET signal line RESET to turn off the first switch circuit 100; inputting a turn-off signal through the SCAN signal line SCAN to turn off the second and third switch circuits 200 and 300; a turn-on signal is input through the enable signal line EM to turn on the fourth and fifth switching circuits 400 and 500.
in the fourth timing t4, the first preset voltage VREFD, the second preset voltage VDATA, or other voltages may be input through the DATA signal line DATA, and the third switch circuit 300 is turned off in the fourth timing t4, so that the voltage value input through the DATA signal line DATA is not limited in the fourth timing t 4.
The driving method of the pixel circuit includes controlling the first switch circuit 100, the second switch circuit 200, the third switch circuit 300, the fourth switch circuit 400, and the fifth switch circuit 500 to be turned on at a first timing T1, inputting a first preset voltage VREFD through a DATA signal line DATA, controlling the first switch circuit 100, the second switch circuit 200, and the third switch circuit 300 to be turned on at a second timing T2, controlling the fourth switch circuit 400 and the fifth switch circuit 500 to be turned off, inputting the first preset voltage VREFD through the DATA signal line DATA, controlling the second switch circuit 200 and the third switch circuit 300 to be turned on at a third timing T3, turning the first switch circuit 100, the fourth switch circuit 400, and the fifth switch circuit 500 to be turned off, and inputting a second preset voltage VDATA through the DATA signal line DATA, wherein the second preset voltage VDATA is greater than the first preset voltage VREFD, and controlling the first switch circuit 100, the second switch circuit 200, the third switch circuit 300 to be turned on at a fourth timing T4, The second switch circuit 200 and the third switch circuit 300 are turned on, and the fourth switch circuit 400 and the fifth switch circuit 500 are turned off, so that when the driving switch circuit 600 drives the organic light emitting diode OLED to emit light, the driving current of the driving switch circuit 600 in the pixel circuit is independent of the threshold voltage Vth, which is equivalent to that the influence of the threshold voltage Vth on the driving current can be compensated no matter whether the threshold voltage Vth is a positive value or a negative value, thereby avoiding the abnormality of the display device, and the driving current is also independent of the voltage input by the power signal line VDD, thereby avoiding the problem of uneven display of the organic light emitting diode OLED at different positions.
In one embodiment, referring to fig. 1 again, the first switch circuit 100 is a first transistor T1, the control terminal of the first switch circuit 100 is the control electrode of the first transistor T1, the first terminal of the first switch circuit 100 is the first electrode of the first transistor T1, and the second terminal of the first switch circuit 100 is the second electrode of the first transistor T1. Thus, when the control electrode of the first transistor T1 receives the turn-on signal, the first and second electrodes of the first transistor T1 may be turned on, and when the control electrode of the first transistor T1 receives the turn-off signal, the first and second electrodes of the first transistor T1 may be turned off.
In one embodiment, referring to fig. 1 again, the second switch circuit 200 is a second transistor T2, the control terminal of the second switch circuit 200 is the control electrode of the second transistor T2, the first terminal of the second switch circuit 200 is the first electrode of the second transistor T2, and the second terminal of the second switch circuit 200 is the second electrode of the second transistor T2. Thus, when the control electrode of the second transistor T2 receives the turn-on signal, the first and second electrodes of the second transistor T2 may be turned on, and when the control electrode of the second transistor T2 receives the turn-off signal, the first and second electrodes of the second transistor T2 may be turned off.
In one embodiment, referring to fig. 1 again, the third switch circuit 300 is a third transistor T3, the control terminal of the third switch circuit 300 is the control electrode of the third transistor T3, the first terminal of the third switch circuit 300 is the first electrode of the third transistor T3, and the second terminal of the third switch circuit 300 is the second electrode of the third transistor T3. In this way, when the control electrode of the third transistor T3 receives the turn-on signal, the first and second electrodes of the third transistor T3 may be turned on, and when the control electrode of the third transistor T3 receives the turn-off signal, the first and second electrodes of the third transistor T3 may be turned off.
In one embodiment, referring to fig. 1 again, the fourth switch circuit 400 is a fourth transistor T4, the control terminal of the fourth switch circuit 400 is the control electrode of the fourth transistor T4, the first terminal of the fourth switch circuit 400 is the first electrode of the fourth transistor T4, and the second terminal of the fourth switch circuit 400 is the second electrode of the fourth transistor T4. Thus, when the gate of the fourth transistor T4 receives the turn-on signal, the first and second electrodes of the fourth transistor T4 may be turned on, and when the gate of the fourth transistor T4 receives the turn-off signal, the first and second electrodes of the fourth transistor T4 may be turned off.
In one embodiment, referring to fig. 1 again, the fifth switch circuit 500 is a fifth transistor T5, the control terminal of the fifth switch circuit 500 is the control electrode of the fifth transistor T5, the first terminal of the fifth switch circuit 500 is the first electrode of the fifth transistor T5, and the second terminal of the fifth switch circuit 500 is the second electrode of the fifth transistor T5. In this way, when the control electrode of the fifth transistor T5 receives the turn-on signal, the first and second electrodes of the fifth transistor T5 may be turned on, and when the control electrode of the fifth transistor T5 receives the turn-off signal, the first and second electrodes of the fifth transistor T5 may be turned off.
in one embodiment, referring to fig. 1 again, the driving switch circuit 600 is a driving transistor TD, the control terminal of the driving switch circuit 600 is the control electrode of the driving transistor TD, the first terminal of the driving switch circuit 600 is the first electrode of the driving transistor TD, and the second terminal of the driving switch circuit 600 is the second electrode of the driving transistor TD. In this way, when the control electrode of the driving transistor TD receives the on signal, the first electrode and the second electrode of the driving transistor TD can be turned on, and when the control electrode of the driving transistor TD receives the off signal, the first electrode and the second electrode of the driving transistor TD can be turned off and turned on.
Specifically, referring to fig. 1 again, in the first timing T1, the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4 and the fifth transistor T5 are all turned on, and at this time, the voltage Vg at the control electrode g of the driving transistor TD is VREF2 (the voltage transmitted by the second reference voltage line VREF 2), the voltage Vs at the second electrode s of the driving transistor TD is VDD (the voltage transmitted by the power supply signal line VDD), the voltage Vd at the first electrode d of the driving transistor TD is VREF1 (the voltage transmitted by the first reference voltage signal line VREF 1), and the voltage Vb at the first end of the second capacitor C2 is VREFD (the voltage transmitted by the DATA signal line DATA).
In the second timing T2, the first transistor T1, the second transistor T2, and the third transistor T3 are all turned on, and the fourth transistor T4 and the fifth transistor T5 are all turned off, at this time, since the second pole s of the driving transistor TD discharges, a current flows into the first reference voltage signal line VREF1 through the driving transistor TD, the voltage of the voltage Vs at the second pole s of the driving transistor TD changes and gradually drops from VDD, when the voltage drops to Vg-Vth (Vg is the voltage at the control pole g of the driving transistor TD, and Vth is the threshold voltage of the driving transistor TD), the driving transistor TD is turned off and no current is generated, and at this time, the voltage Vs at the second pole s of the driving transistor TD is equal to VREF-Vth-2-Vth.
In a third timing T3, the second transistor T2 and the third transistor T3 are turned on, the first transistor T1, the fourth transistor T4 and the fifth transistor T5 are turned off, the voltage inputted through the DATA signal line DATA is changed from the first preset voltage VREFD to a second preset voltage VDATA, where VDATA > VREFD, and the voltage Vs at the second pole s of the driving transistor TD is changed to Vs ', and in this timing, the voltage Vs' at the second pole s of the driving transistor TD is calculated by charge conservation:
in addition, the voltage difference V (C1) across the first capacitor C1 can be calculated by the following formula:
in the fourth timing T4, which is a light emitting stage for controlling the light emission of the organic light emitting diode, the first transistor T1, the second transistor T2 and the third transistor T3 are all turned off, the fourth transistor T4 and the fifth transistor T5 are all turned on, and at this time, the voltage Vs at the second terminal s of the driving transistor TD is equal to VDD. Since the transistors connected to the gate g terminal of the driving transistor TD are all turned off at this time, the gate g terminal of the driving transistor TD is not directly controlled by each power supply, so that the voltage difference Vsg across the first capacitor C1 remains unchanged and does not change due to the change of the voltage at the second terminal s terminal of the driving transistor TD, and thus the driving current Id of the driving transistor TD can be calculated by the following formula:
Where μ is the electron mobility of the channel, Cox is the channel capacitance per unit area of the drive transistor TD, W is the channel width of the drive transistor, and L is the channel length of the drive transistor.
As can be seen from the above, in the fourth timing t4, which is the light emitting stage, the driving current Id of the driving transistor TD is not dependent on the threshold voltage Vth of the driving transistor TD, and therefore, the influence of the threshold voltage Vth on the driving current Id can be compensated regardless of whether the threshold voltage Vth is a positive value or a negative value, thereby avoiding the display device from being abnormal, and the driving current Id is also independent of the magnitude of the voltage inputted to the power supply signal line VDD, thereby avoiding the problem of display unevenness of the organic light emitting diodes at different positions.
In one embodiment, the present application also provides a display device including a reset signal line, a first reference voltage signal line, a scan signal line, a second reference voltage signal line, a data signal line, an enable signal line, a power signal line, a common voltage signal line, and the pixel circuit described in any one of the above embodiments; the reset signal line is connected to a control terminal of the first switch circuit, the first reference voltage line is connected to a first terminal of the first switch circuit, the scan signal line is connected to a control terminal of the second switch circuit and a control terminal of the third switch circuit, respectively, the second reference voltage signal line is connected to a first terminal of the second switch circuit, the data signal line is connected to a first terminal of the third switch circuit, the enable signal line is connected to a control terminal of the fourth switch circuit and a control terminal of the fifth switch circuit, respectively, the power signal line is connected to a first terminal of the fourth switch circuit, and the common voltage signal line is connected to a cathode of the organic light emitting diode.
The display device controls the first switch circuit, the second switch circuit, the third switch circuit, the fourth switch circuit and the fifth switch circuit to be turned on at a first timing, and inputs a first preset voltage through the data signal line, controls the first switch circuit, the second switch circuit and the third switch circuit to be turned on at a second timing, the fourth switch circuit and the fifth switch circuit to be turned off, and inputs the first preset voltage through the data signal line, controls the second switch circuit and the third switch circuit to be turned on at a third timing, turns off the first switch circuit, the fourth switch circuit and the fifth switch circuit, and inputs a second preset voltage through the data signal line, wherein the second preset voltage is larger than the first preset voltage, controls the first switch circuit, the second switch circuit and the third switch circuit to be turned on at the fourth timing, turns off the fourth switch circuit and the fifth switch circuit, therefore, when the driving switch circuit drives the organic light emitting diode to emit light, the driving current of the driving switch circuit in the pixel circuit is irrelevant to the threshold voltage Vth, namely, the influence of the threshold voltage Vth on the driving current can be compensated no matter whether the threshold voltage Vth is a positive value or a negative value, the abnormity of the display device is avoided, and the driving current is also irrelevant to the voltage input by the power signal line, so that the problem of uneven display of the organic light emitting diode at different positions is avoided.
the technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A pixel circuit, comprising: the driving circuit comprises a first switch circuit, a second switch circuit, a third switch circuit, a fourth switch circuit, a fifth switch circuit, a driving switch circuit, a first capacitor, a second capacitor and an organic light emitting diode;
The control end of the first switch circuit is used for being connected with a reset signal line, the first end of the first switch circuit is used for being connected with a first reference voltage signal line, and the second end of the first switch circuit is connected with the first end of the driving switch circuit;
the control end of the second switch circuit is used for being connected with a scanning signal line, the first end of the second switch circuit is used for being connected with a second reference voltage signal line, and the second end of the second switch circuit is connected with the control end of the driving switch circuit;
The control end of the third switch circuit is used for being connected with the scanning signal line, the first end of the third switch circuit is used for being connected with the data signal line, and the second end of the third switch circuit is connected with the first end of the second capacitor;
The control end of the fourth switch circuit is used for being connected with an enabling signal line, the first end of the fourth switch circuit is used for being connected with a power signal line, the second end of the fourth switch circuit is connected with the second end of the driving switch circuit, and the second end of the fourth switch circuit is further connected with the second end of the second capacitor;
The second end of the second capacitor is also connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the control end of the driving switch circuit;
The control end of the fifth switch circuit is used for being connected with the enabling signal line, the first end of the fifth switch circuit is connected with the first end of the driving switch circuit, the second end of the fifth switch circuit is connected with the anode of the organic light-emitting diode, and the cathode of the organic light-emitting diode is used for being connected with the common voltage signal line.
2. The pixel circuit according to claim 1, further comprising the first reference voltage signal line for connection with the common voltage signal line.
3. the pixel circuit according to claim 1, wherein the first switch circuit is a first transistor, the control terminal of the first switch circuit is a control electrode of the first transistor, the first terminal of the first switch circuit is a first electrode of the first transistor, and the second terminal of the first switch circuit is a second electrode of the first transistor.
4. The pixel circuit according to claim 1, wherein the second switch circuit is a second transistor, wherein a control terminal of the second switch circuit is a control electrode of the second transistor, wherein a first terminal of the second switch circuit is a first electrode of the second transistor, and wherein a second terminal of the second switch circuit is a second electrode of the second transistor.
5. The pixel circuit according to claim 1, wherein the third switch circuit is a third transistor, wherein a control terminal of the third switch circuit is a control electrode of the third transistor, wherein a first terminal of the third switch circuit is a first electrode of the third transistor, and wherein a second terminal of the third switch circuit is a second electrode of the third transistor.
6. The pixel circuit according to claim 1, wherein the fourth switch circuit is a fourth transistor, the control terminal of the fourth switch circuit is the control electrode of the fourth transistor, the first terminal of the fourth switch circuit is the first electrode of the fourth transistor, and the second terminal of the fourth switch circuit is the second electrode of the fourth transistor.
7. the pixel circuit according to claim 1, wherein the fifth switch circuit is a fifth transistor, the control terminal of the fifth switch circuit is the control electrode of the fifth transistor, the first terminal of the fifth switch circuit is the first electrode of the fifth transistor, and the second terminal of the fifth switch circuit is the second electrode of the fifth transistor.
8. The pixel circuit according to claim 1, wherein the driving switch circuit is a driving transistor, the control terminal of the driving switch circuit is a control electrode of the driving transistor, the first terminal of the driving switch circuit is a first electrode of the driving transistor, and the second terminal of the driving switch circuit is a second electrode of the driving transistor.
9. A driving method of a pixel circuit for driving the pixel circuit according to any one of claims 1 to 8, the driving method comprising:
Inputting a turn-on signal through the reset signal line to turn on the first switch circuit in a first timing; inputting a turn-on signal through the scanning signal line to turn on the second switch circuit and the third switch circuit; inputting a turn-on signal through the enable signal line to turn on the fourth and fifth switching circuits; inputting a first preset voltage through the data signal line;
inputting a turn-on signal through the reset signal line to turn on the first switch circuit in a second timing; inputting a turn-on signal through the scanning signal line to turn on the second switch circuit and the third switch circuit; inputting a turn-off signal through the enable signal line to turn off the fourth and fifth switching circuits; inputting a first preset voltage through the data signal line;
In a third timing, a turn-off signal is input through the reset signal line to turn off the first switch circuit; inputting a turn-on signal through the scanning signal line to turn on the second switch circuit and the third switch circuit; inputting a turn-off signal through the enable signal line to turn off the fourth and fifth switching circuits; inputting a second preset voltage through the data signal line, wherein the second preset voltage is greater than the first preset voltage;
In a fourth timing, a turn-off signal is input through the reset signal line to turn off the first switch circuit; inputting a turn-off signal through the scanning signal line to turn off the second switch circuit and the third switch circuit; a turn-on signal is input through the enable signal line to turn on the fourth and fifth switch circuits.
10. A display device comprising a reset signal line, a first reference voltage signal line, a scan signal line, a second reference voltage signal line, a data signal line, an enable signal line, a power supply signal line, a common voltage signal line, and the pixel circuit according to any one of claims 1 to 8;
the reset signal line is connected to a control terminal of the first switch circuit, the first reference voltage line is connected to a first terminal of the first switch circuit, the scan signal line is connected to a control terminal of the second switch circuit and a control terminal of the third switch circuit, respectively, the second reference voltage signal line is connected to a first terminal of the second switch circuit, the data signal line is connected to a first terminal of the third switch circuit, the enable signal line is connected to a control terminal of the fourth switch circuit and a control terminal of the fifth switch circuit, respectively, the power signal line is connected to a first terminal of the fourth switch circuit, and the common voltage signal line is connected to a cathode of the organic light emitting diode.
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