CN113889039B - Pixel circuit, driving method thereof, display substrate and display device - Google Patents
Pixel circuit, driving method thereof, display substrate and display device Download PDFInfo
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- CN113889039B CN113889039B CN202111371895.6A CN202111371895A CN113889039B CN 113889039 B CN113889039 B CN 113889039B CN 202111371895 A CN202111371895 A CN 202111371895A CN 113889039 B CN113889039 B CN 113889039B
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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
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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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- 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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention discloses a pixel circuit and a driving method thereof, a display substrate and a display device, wherein the pixel circuit comprises a PAM sub-circuit, a PWM sub-circuit, a reset compensation sub-circuit, a first light-emitting control sub-circuit, a second light-emitting control sub-circuit and a driving sub-circuit; the reset compensation sub-circuit resets or compensates the threshold value of the control end of the driving sub-circuit; the first light-emitting control sub-circuit transmits the driving current generated by the driving sub-circuit to the second light-emitting control sub-circuit and controls the conduction time of a first current path between the first voltage signal end and the second light-emitting control sub-circuit; the pulse width modulation sub-circuit transmits a pulse width modulation signal of the pulse width modulation signal end to the second light-emitting control sub-circuit so as to control the on-time of the second light-emitting control sub-circuit. Therefore, the effective luminous brightness of the luminous device can be controlled through the PAM data voltage and the PWM signal, the aim of adjusting the display gray scale is achieved, and the uniformity of the brightness of the display screen is improved.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a pixel circuit, a driving method thereof, a display substrate and a display device.
Background
Generally, active matrix light emitting diode (Active Matrix LightEmitting Diod, AM-LED) displays and the like involve millions of LED chips, and although the chips are classified, there is still a large difference in brightness between individual chips at low current densities.
Therefore, how to realize uniform control of the brightness of the display screen is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention mainly aims to provide a pixel circuit, a driving method thereof, a display substrate and a display device, so as to solve the problem of poor brightness uniformity of a display screen in the prior art.
In view of the above problems, the present invention provides a pixel circuit including a pulse amplitude modulation sub-circuit, a pulse width modulation sub-circuit, a reset compensation sub-circuit, a first light emission control sub-circuit, a second light emission control sub-circuit, and a driving sub-circuit;
the first end of the pulse amplitude modulation subcircuit is electrically connected with a pulse amplitude modulation signal end, the control end of the pulse amplitude modulation subcircuit is electrically connected with a first scanning signal end, and the second end of the pulse amplitude modulation subcircuit is electrically connected with the first end of the driving subcircuit and the first end of the first light-emitting subcircuit;
The first end of the reset compensation sub-circuit is electrically connected with the second end of the driving sub-circuit and the second end of the first light-emitting control sub-circuit, the second end of the reset compensation sub-circuit is electrically connected with the control end of the driving sub-circuit, and the control end of the reset compensation sub-circuit is electrically connected with the second scanning signal end;
the first control end of the first light-emitting control sub-circuit is electrically connected with the first light-emitting signal control end, the second control end of the first light-emitting control sub-circuit is electrically connected with the second light-emitting signal control end, the third end of the first light-emitting control sub-circuit is electrically connected with the first voltage signal end, and the fourth end of the first light-emitting control sub-circuit is electrically connected with the first end of the second light-emitting control sub-circuit; the second end of the second light-emitting control sub-circuit is electrically connected with the anode end of the light-emitting device;
the first end of the pulse width modulation subcircuit is electrically connected with a pulse width modulation signal end, the second end of the pulse width modulation subcircuit is electrically connected with the control end of the second light-emitting control subcircuit, and the control end of the pulse width modulation subcircuit is electrically connected with a third scanning signal end;
The reset compensation sub-circuit is used for resetting or threshold compensation of the control end of the driving sub-circuit under the control of the second scanning signal end;
the first light-emitting control sub-circuit is used for transmitting the driving current generated by the driving sub-circuit to the second light-emitting control sub-circuit under the control of the first light-emitting control signal end and the second light-emitting signal control end, and controlling the conduction time of a first current path between the first voltage signal end and the second light-emitting control sub-circuit;
the pulse width modulation sub-circuit is used for transmitting a pulse width modulation signal of the pulse width modulation signal end to the second light-emitting control sub-circuit under the control of the third scanning signal end so as to control the on-time of the second light-emitting control sub-circuit.
Further, the pixel circuit further includes a reset sub-circuit;
the first end of the reset sub-circuit is electrically connected with the second voltage signal end, the second end of the reset sub-circuit is electrically connected with the first end of the second light-emitting control sub-circuit, and the control end of the reset sub-circuit is electrically connected with the fourth scanning signal end.
Further, in the pixel circuit, the reset sub-circuit includes an eighth transistor;
a first pole of the eighth transistor is used as a first end of the reset sub-circuit, a second pole of the eighth transistor is used as a second end of the reset sub-circuit, and a control pole of the eighth transistor is used as a control end of the reset sub-circuit;
the first electrode of the eighth transistor is electrically connected with the second voltage signal end, the second electrode of the eighth transistor is electrically connected with the first end of the second light-emitting control sub-circuit, and the control electrode of the eighth transistor is electrically connected with the fourth scanning signal end.
Further, the pixel circuit further includes a first capacitor;
the first end of the first capacitor is electrically connected with the control end of the driving sub-circuit;
two ends of the first capacitor are electrically connected with the second pole of the eighth transistor.
Further, the pixel circuit further includes an anode discharge sub-circuit;
the first end of the anode discharging sub-circuit is electrically connected with the third voltage signal end, the second end of the anode discharging sub-circuit is electrically connected with the anode end of the light emitting device, and the control end of the anode discharging circuit is electrically connected with the fifth scanning signal end.
Further, in the pixel circuit, the anode discharge sub-circuit includes a tenth transistor;
a first pole of the tenth transistor is used as a first end of the anode discharging sub-circuit, a second pole of the tenth transistor is used as a second end of the anode discharging sub-circuit, and a control pole of the tenth transistor is used as a control end of the anode discharging sub-circuit;
the first electrode of the tenth transistor is electrically connected with the third voltage signal terminal, the second electrode of the tenth transistor is electrically connected with the anode terminal of the light emitting device, and the control electrode of the tenth transistor is electrically connected with the fifth scanning signal terminal.
Further, in the pixel circuit, the pulse width modulation sub-circuit includes a fourth transistor, the pulse width modulation sub-circuit includes a sixth transistor and a second capacitor, the reset compensation sub-circuit includes a second transistor, the first light emission control sub-circuit includes a first transistor and a fifth transistor, the second light emission control sub-circuit includes a seventh transistor, and the driving sub-circuit includes a third transistor;
a first pole of the fourth transistor is used as a first end of the pulse amplitude modulation subcircuit, a second pole of the fourth transistor is used as a second end of the pulse amplitude modulation subcircuit, and a control pole of the fourth transistor is used as a control end of the pulse amplitude modulation subcircuit;
A first electrode of the second transistor is used as a first end of the reset compensation sub-circuit, a second electrode of the second transistor is used as a second end of the reset compensation sub-circuit, and a control electrode of the second transistor is used as a control end of the reset compensation sub-circuit;
the control electrode of the first transistor is used as a first control end of the first light-emitting control sub-circuit, the first electrode of the first transistor is used as a third end of the first light-emitting control sub-circuit, and the second electrode of the first transistor is used as a second end of the first light-emitting control sub-circuit; the control electrode of the fifth transistor is used as the second control end of the first light-emitting control sub-circuit, the first electrode of the fifth transistor is used as the first end of the first light-emitting control sub-circuit, and the second electrode of the fifth transistor is used as the fourth end of the first light-emitting control sub-circuit;
the control electrode of the sixth transistor is used as the control end of the pulse width modulation subcircuit, the first electrode of the sixth transistor is used as the first end of the pulse width modulation subcircuit, and the second electrode of the sixth transistor is used as the second end of the pulse width modulation subcircuit;
A first pole of the seventh transistor is used as a first end of the second light-emitting control sub-circuit, a second pole of the seventh transistor is used as a second end of the second light-emitting control sub-circuit, and control of the seventh transistor is used as a control end of the second light-emitting control sub-circuit;
a first pole of the third transistor is used as a first end of the driving sub-circuit, a second pole of the third transistor is used as a second end of the driving sub-circuit, and a control pole of the third transistor is used as a control end of the driving sub-circuit;
a first electrode of the fourth transistor is electrically connected with the pulse amplitude modulation signal end, a control electrode of the fourth transistor is electrically connected with the first scanning signal end, and a second electrode of the fourth transistor is electrically connected with the first electrode of the third transistor and the first electrode of the fifth transistor;
the first electrode of the second transistor is electrically connected with the second electrode of the third transistor and the second electrode of the first transistor, the second electrode of the second transistor is electrically connected with the control electrode of the third transistor, and the control electrode of the second transistor is electrically connected with the second scanning signal end;
The control electrode of the first transistor is electrically connected with the first light-emitting signal control end, the control electrode of the fifth transistor is electrically connected with the second light-emitting signal control end, the first electrode of the first transistor is electrically connected with the first voltage signal end, and the second electrode of the fifth transistor is electrically connected with the first electrode of the seventh transistor; a second electrode of the seventh transistor is electrically connected with the anode terminal of the light emitting device;
the first electrode of the sixth transistor is electrically connected with the pulse width modulation signal end, the control electrode of the sixth transistor is electrically connected with the third scanning signal end, and the second electrode of the sixth transistor is electrically connected with the control electrode of the seventh transistor and the first end of the second capacitor; the second end of the second capacitor is electrically connected with the fourth voltage signal end.
Further, in the pixel circuit, the first light emitting control sub-circuit further includes a ninth transistor;
a control electrode of the ninth transistor and a control electrode of the fifth transistor are used as a second control end of the first light-emitting control sub-circuit together;
the second pole of the ninth transistor is used as the fourth terminal of the first light emitting control sub-circuit, and the first pole of the ninth transistor is electrically connected with the second pole of the fifth transistor.
Further, in the pixel circuit, the second transistor is an oxide transistor; the first transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor and the ninth transistor are low-temperature polysilicon transistors; or alternatively
The first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, and the ninth transistor are oxide transistors; or alternatively
The first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor and the ninth transistor are low-temperature polysilicon transistors.
The present invention also provides a driving method of the pixel circuit as defined in any one of the above, comprising:
in the resetting stage, the resetting compensation subcircuit is controlled to be conducted through the second scanning signal end, and the second end of the first luminous control subcircuit is controlled to be conducted with the first voltage signal end through the first luminous signal control end, so that the control end of the driving subcircuit is reset;
In the writing compensation stage, the pulse amplitude modulation subcircuit is controlled to be conducted through a first scanning signal end, the reset compensation subcircuit is controlled to be conducted through a second scanning signal end, the second end of the first light-emitting control subcircuit is controlled to be disconnected from the first voltage signal end through the first light-emitting signal control end, a pulse amplitude modulation signal is written into the control end of the driving subcircuit and subjected to threshold compensation, the pulse width modulation subcircuit is controlled to be conducted through the third scanning signal end, and a pulse width modulation signal is written into the control end of the second light-emitting control subcircuit so as to control the second light-emitting control subcircuit to be conducted or disconnected;
in the light-emitting control stage, the first light-emitting control circuit is controlled to be conducted through the first light-emitting control signal end and the second light-emitting control signal end, and driving current generated by the driving sub-circuit is transmitted to the second light-emitting control sub-circuit; and if the pulse width modulation signal can control the second light-emitting control sub-circuit to be conducted, controlling the light-emitting device to emit light, and if the pulse width modulation signal controls the second light-emitting control sub-circuit to be disconnected, controlling the light-emitting device not to emit light.
Further, the driving method of the pixel circuit further includes:
in the light-emitting control stage, the first light-emitting control sub-circuit is controlled to be conducted according to a preset frequency through the second light-emitting control signal end.
The invention also provides a display substrate comprising a pixel circuit as claimed in any one of the preceding claims.
The invention also provides a display device comprising the display substrate.
One or more embodiments of the above-described solution may have the following advantages or benefits compared to the prior art:
according to the pixel circuit, the driving method thereof, the display substrate and the display device, PAM data voltage related to display gray scale can be output to the driving sub-circuit through the pulse amplitude modulation (Pulse amplitude modulation, PAM) sub-circuit, so that the driving sub-circuit can generate driving current for driving the light emitting device to emit light, the PWM signal is transmitted to the second light emitting control sub-circuit through the pulse width modulation (Pulse width modulation, PWM) sub-circuit, the conduction duration of the second light emitting control sub-circuit is controlled, and finally the control of the conduction duration of a current path between the first voltage signal end and the light emitting device is realized, and therefore, the effective light emitting brightness of the light emitting device can be controlled through the size of the PAM data voltage and the PWM signal in one scanning period, so that the aim of adjusting the display gray scale is fulfilled, and the uniformity of the brightness of the display screen is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention, without limitation to the invention. In the drawings:
FIG. 1 is a topology of one embodiment of a pixel circuit of the present invention;
FIG. 2 is a timing control diagram of one embodiment of the pixel circuit shown in FIG. 1;
FIG. 3a is a state diagram of FIG. 1 in a reset phase;
FIG. 3b is a state diagram of the write compensation phase of FIG. 1;
FIG. 3c is a state diagram of the light emission control stage of FIG. 1;
FIG. 4 is a schematic diagram of the pixel circuit shown in FIG. 1;
FIG. 5 is a timing control diagram of another embodiment of the pixel circuit shown in FIG. 1;
FIG. 6 is a topology of another embodiment of a pixel circuit of the present invention;
fig. 7 is a topology of yet another embodiment of the pixel circuit of the present invention.
Detailed Description
The following will describe embodiments of the present invention in detail with reference to the drawings and examples, thereby solving the technical problems by applying technical means to the present invention, and realizing the technical effects can be fully understood and implemented accordingly. It should be noted that, as long as no conflict is formed, each embodiment of the present invention and each feature of each embodiment may be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.
In order to solve the technical problems in the prior art, the embodiment of the invention provides a pixel circuit.
For convenience of description, in the following embodiments, the pulse amplitude modulation sub-circuit is referred to as a PAM sub-circuit, and the pulse width modulation sub-circuit is referred to as a PWM sub-circuit. The pulse amplitude modulation signal terminal is called a PAM signal terminal, and the pulse width modulation signal terminal is called a PWM signal terminal.
Fig. 1 is a topology diagram of an embodiment of a pixel circuit of the present invention, and as shown in fig. 1, the pixel circuit of the present embodiment may include a PAM sub-circuit 10, a PWM sub-circuit 11, a reset compensation sub-circuit 12, a first light emission control sub-circuit 13, a second light emission control sub-circuit 14, and a driving sub-circuit 15.
The first end of the PAM sub-circuit 10 is electrically connected to the PAM signal end, the control end of the PAM sub-circuit 10 is electrically connected to the first scan signal end G1, and the second end of the PAM sub-circuit 10 is electrically connected to the first end of the driving sub-circuit 15 and the first end of the first light emitting sub-circuit 13.
The first end of the reset compensation sub-circuit 12 is electrically connected to the second end of the driving sub-circuit 15 and the second end of the first light emitting control sub-circuit 13, the second end of the reset compensation sub-circuit 12 is electrically connected to the control end of the driving sub-circuit 15, and the control end of the reset compensation sub-circuit 12 is electrically connected to the second scanning signal end G2.
The first control end of the first light-emitting control sub-circuit 13 is electrically connected with a first light-emitting signal control end E1, the second control end of the first light-emitting control sub-circuit 13 is electrically connected with a second light-emitting signal control end E2, the third end of the first light-emitting control sub-circuit 13 is electrically connected with a first voltage signal end V1, and the fourth end of the first light-emitting control sub-circuit 13 is electrically connected with the first end of the second light-emitting control sub-circuit 14; the second terminal of the second light emission control sub-circuit 14 is electrically connected to the anode terminal of the light emitting device D, and the cathode terminal of the light emitting device D is electrically connected to the fourth voltage signal terminal V4.
The first end of the PWM sub-circuit 11 is electrically connected to the PWM signal end, the second end of the PWM sub-circuit 11 is electrically connected to the control end of the second light emission control sub-circuit 14, and the control end of the PWM sub-circuit 11 is electrically connected to the third scan signal end G3.
The present invention is not limited in the kind of the light emitting device D. In some embodiments, the light emitting device D may be a sub-millimeter light emitting diode (Mini Light Emitting Diode, mini LED) or may be a Micro light emitting diode (Micro Light Emitting Diode, micro LED) or an organic light emitting diode (Organic Light Emitting Diode, OLED).
In a specific implementation process, the reset compensation sub-circuit 12 is configured to reset or perform threshold compensation on the control terminal of the driving sub-circuit 15 under the control of the second scanning signal terminal G2.
The first light-emitting control sub-circuit is configured to transmit the driving current generated by the driving sub-circuit 15 to the second light-emitting control sub-circuit 14 under the control of the first light-emitting control signal terminal and the second light-emitting signal control terminal E2, and control the conduction duration of the current path between the first voltage signal terminal V1 and the second light-emitting control sub-circuit 14.
The PWM sub-circuit 11 is configured to transmit a PWM signal of the PWM signal terminal to the second light-emitting control sub-circuit 14 under the control of the third scanning signal terminal G3, so as to control the on-time of the current path between the first voltage signal terminal V1 and the second light-emitting control sub-circuit 14 by controlling the on-time of the second light-emitting control sub-circuit 14.
In a specific implementation process, the first scanning signal terminal G1 and the third scanning signal terminal G3 may be the same signal terminal or different signal terminals.
Fig. 2 is a timing control diagram of an embodiment of the pixel circuit shown in fig. 1, where a signal sent by the first scanning signal terminal G1 may be denoted as gate_a, a signal sent by the third scanning signal terminal G3 may be denoted as gate_b, a signal sent by the second scanning terminal G2 may be denoted as RST, a signal sent by the first light-emitting signal control terminal E1 may be denoted as EM, and a signal sent by the second light-emitting signal control terminal E2 may be denoted as em_pwm.
The working procedure of the pixel circuit of this embodiment is as follows:
in the reset stage t1, the second scan signal terminal G2 controls the conduction of the reset compensation sub-circuit 12, and the first light-emitting signal control terminal E1 controls the conduction of the second terminal of the first light-emitting control sub-circuit 13 and the first voltage signal terminal V1, so that the control terminal of the driving sub-circuit 15 resets. Fig. 3a is a state diagram of fig. 1 in a reset phase.
In the write compensation stage t2, the PAM sub-circuit 10 is controlled to be turned on by a first scanning signal terminal G1, the reset compensation sub-circuit 12 is controlled to be turned on by a second scanning signal terminal G2, the second terminal of the first light-emitting control sub-circuit 13 is controlled to be disconnected from the first voltage signal terminal V1 by the first light-emitting signal control terminal E1, a PAM signal is written into the control terminal of the driving sub-circuit 15 and subjected to threshold compensation, the PWM sub-circuit 11 is controlled to be turned on by the third scanning signal terminal G3, and a PWM signal is written into the control terminal of the second light-emitting control sub-circuit 14 to control the second light-emitting control sub-circuit 14 to be turned on or off. Wherein the PWM signal has two levels, which can control the second light emission control sub-circuit 14 to be turned on or off, so that the light emission time of the light emitting device D can be selected. FIG. 3b is a state diagram of the write compensation stage of FIG. 1.
Note that, the second light-emitting control sub-circuit 14 is turned on or off according to the level of the PWM signal, and the second light-emitting control sub-circuit 14 in fig. 3b is exemplified by an on state, and is not shown for an off state.
In the light emission control stage t3, the first light emission control circuit is controlled to be turned on through the first light emission control signal terminal and the second light emission control signal terminal E2, and the driving current generated by the driving sub-circuit 15 is transmitted to the second light emission control sub-circuit 14; and if the PWM signal can control the second light-emitting control sub-circuit 14 to be conducted, controlling the light-emitting device D to emit light, and if the PWM signal controls the second light-emitting control sub-circuit 14 to be disconnected, controlling the light-emitting device D not to emit light. Fig. 3c is a state diagram of fig. 1 in a light emission control stage.
The second light-emitting control sub-circuit 14 is turned on or off according to the level of the PWM signal, and the second light-emitting control sub-circuit 14 in fig. 3c is exemplified by an on state, and is not shown for an off state.
Fig. 4 is a schematic diagram of the pixel circuit shown in fig. 1, and as shown in fig. 4, if the PWM signal is a high level signal in the write compensation stage, the current I (D) flows through the light emitting device D in the light emission control stage t3, and the light emitting device D can emit light. If the PWM signal is a low level signal, the light emitting device D does not emit light in the light emission control stage t 3. Fig. 4 illustrates that the signals sent by the first scan signal terminal G1 and the third scan signal terminal G3 are the same, which may be denoted as Gate.
As can be seen from the above, only when the first light-emitting control sub-circuit 13 and the second light-emitting control sub-circuit 14 are in the on state, the current path between the first voltage signal terminal V1 and the second light-emitting control sub-circuit 14 can be conducted, and the driving current generated by the driving sub-circuit 15 can be outputted to the light-emitting device D through the current path. In this way, the effective light-emitting brightness of the light-emitting device D can be cooperatively controlled by the driving current, the first light-emitting control sub-circuit 13 and the second light-emitting control sub-circuit 14, so that factors influencing the effective light-emitting brightness of the light-emitting device D are increased, gray scale values which can be displayed by sub-pixels with the pixel circuit are more diversified, and the uniformity of the brightness of the display screen is improved.
According to the pixel circuit and the driving method thereof, the PAM data voltage related to the display gray scale can be output to the driving sub-circuit 15 through the PAM sub-circuit 10, so that the driving sub-circuit 15 can generate driving current for driving the light emitting device D to emit light, the PWM sub-circuit 11 transmits PWM signals to the second light emitting control sub-circuit 14 to control the on-time of the second light emitting control sub-circuit 14, and finally the control of the on-time of the current path between the first voltage signal end V1 and the light emitting device D is realized, and in one scanning period, the effective light emitting brightness of the light emitting device D can be controlled through the size of the PAM data voltage and the PWM signals, so that the purpose of adjusting the display gray scale is achieved, and the uniformity of the brightness of the display screen is improved.
Fig. 5 is a timing control diagram of another embodiment of the pixel circuit shown in fig. 1, where the timing control diagram of the pixel circuit of this embodiment is different from the timing control diagram of the embodiment shown in fig. 2 in that a high-level square wave output by the second light-emitting control signal terminal E2 may include a plurality of low-level sub-square waves, so that in the light-emitting control stage, the first light-emitting control sub-circuit 13 may be controlled to be turned on according to a preset frequency by the second light-emitting control signal terminal E2, so as to reduce the flicker risk by increasing the brightness switching frequency.
As shown in fig. 1, the pixel circuit of the present embodiment may further include a reset sub-circuit 16. The first end of the reset sub-circuit 16 is electrically connected to the second voltage signal end V2, the second end of the reset sub-circuit 16 is electrically connected to the first end of the second light emission control sub-circuit 14, and the control end of the reset sub-circuit 16 is electrically connected to the fourth scan signal end.
In a specific implementation process, the fourth scanning signal end and the second scanning signal end G2 may be the same signal end or different signal ends. The second voltage signal terminal V2 may input the Vint signal.
In one specific implementation, as shown in fig. 1, the PAM sub-circuit 10 includes a fourth transistor T4, the PWM sub-circuit 11 includes a sixth transistor T6 and a second capacitor, the reset compensation sub-circuit 12 includes a second transistor T2, the first light emitting control sub-circuit 13 includes a first transistor T1 and a fifth transistor T5, the second light emitting control sub-circuit 14 includes a seventh transistor T7, the driving sub-circuit 15 includes a third transistor T3, and the reset sub-circuit 16 includes an eighth transistor T8.
The first pole of the fourth transistor T4 is used as the first terminal of the PAM subcircuit 10, the second pole of the fourth transistor T4 is used as the second terminal of the PAM subcircuit 10, and the control pole of the fourth transistor T4 is used as the control terminal of the PAM subcircuit 10.
The first pole of the second transistor T2 is used as the first terminal of the reset compensation sub-circuit 12, the second pole of the second transistor T2 is used as the second terminal of the reset compensation sub-circuit 12, and the control pole of the second transistor T2 is used as the control terminal of the reset compensation sub-circuit 12.
The control electrode of the first transistor T1 is used as a first control end of the first light-emitting control sub-circuit 13, the first electrode of the first transistor T1 is used as a third end of the first light-emitting control sub-circuit 13, and the second electrode of the first transistor T1 is used as a second end of the first light-emitting control sub-circuit 13; the control electrode of the fifth transistor T5 is used as the second control terminal of the first light emitting control sub-circuit 13, the first electrode of the fifth transistor T5 is used as the first terminal of the first light emitting control sub-circuit 13, and the second electrode of the fifth transistor T5 is used as the fourth terminal of the first light emitting control sub-circuit 13.
The control electrode of the sixth transistor T6 is used as the control terminal of the PWM sub-circuit 11, the first electrode of the sixth transistor T6 is used as the first terminal of the PWM sub-circuit 11, and the second electrode of the sixth transistor T6 is used as the second terminal of the PWM sub-circuit 11.
The first pole of the seventh transistor T7 is used as the first terminal of the second light emission control sub-circuit 14, the second pole of the seventh transistor T7 is used as the second terminal of the second light emission control sub-circuit 14, and the control of the seventh transistor T7 is used as the control terminal of the second light emission control sub-circuit 14.
The first pole of the third transistor T3 is used as the first terminal of the driving sub-circuit 15, the second pole of the third transistor T3 is used as the second terminal of the driving sub-circuit 15, and the control pole of the third transistor T3 is used as the control terminal of the driving sub-circuit 15.
The first pole of the eighth transistor T8 is used as the first terminal of the reset sub-circuit 16, the second pole of the eighth transistor T8 is used as the second terminal of the reset sub-circuit 16, and the control pole of the eighth transistor T8 is used as the control terminal of the reset sub-circuit 16. The eighth transistor T8 may be a low temperature polysilicon transistor.
In a specific implementation process, the first pole of the fourth transistor T4 is electrically connected to the PAM signal terminal, the control pole of the fourth transistor T4 is electrically connected to the first scan signal terminal G1, and the second pole of the fourth transistor T4 is electrically connected to the first pole of the third transistor T3 and the first pole of the fifth transistor T5.
The first pole of the second transistor T2 is electrically connected to the second pole of the third transistor T3 and the second pole of the first transistor T1, the second pole of the second transistor T2 is electrically connected to the control pole of the third transistor T3, and the control pole of the second transistor T2 is electrically connected to the second scan signal terminal G2.
The control electrode of the first transistor T1 is electrically connected to the first light-emitting signal control end E1, the control electrode of the fifth transistor T5 is electrically connected to the second light-emitting signal control end E2, the first electrode of the first transistor T1 is electrically connected to the first voltage signal end V1, and the second electrode of the fifth transistor T5 is electrically connected to the first electrode of the seventh transistor T7; the second electrode of the seventh transistor T7 is electrically connected to the anode terminal of the light emitting device D.
A first pole of the sixth transistor T6 is electrically connected to the PWM signal terminal, a control pole of the sixth transistor T6 is electrically connected to the third scan signal terminal G3, and a second pole of the sixth transistor T6 is electrically connected to the control pole of the seventh transistor T7 and the first terminal of the second capacitor; the second end of the second capacitor is electrically connected with the fourth voltage signal end.
The first pole of the eighth transistor T8 is electrically connected to the second voltage signal terminal V2, the second pole of the eighth transistor T8 is electrically connected to the first terminal of the second light emission control sub-circuit 14, and the control pole of the eighth transistor T8 is electrically connected to the fourth scan signal terminal.
As shown in fig. 1, the pixel circuit of the present embodiment may further include a first capacitor. A first end of the first capacitor is electrically connected with a control end of the driving sub-circuit 15; the two ends of the first capacitor are electrically connected with the second pole of the eighth transistor T8.
In one specific implementation, the circuit works as follows:
in the reset phase t1: T1/T2/T8 is opened, and the N2/N4 node is reset;
in the write compensation phase t2: the T2/T3/T4 is opened, the N2 node writes PAM+Vth, and Vth compensation is performed; the T6 is opened, the grid electrode of the T7 is written with PWM signals, the PWM has two levels, and whether the T7 is opened or not is controlled, so that the light-emitting duration can be selected;
in the light emission control phase t3: T1/T3/T5/T7 is opened, the voltage of the N4 node is changed into V (D), the voltage of the N2 node is coupled, the voltage is changed into PAM+Vth+V (D) -Vint, and the light emitting device D emits light under the drive of VDD. Alternatively, T1/T3/T5 is turned on, T7 is turned off, the N4 node voltage becomes V (D), the N2 node voltage is coupled, the voltage becomes PAM+Vth+V (D) -Vint, and the light emitting device D does not emit light.
The voltages at nodes N1-N4 for each stage are shown in Table 1:
TABLE 1
Fig. 6 is a topology diagram of another embodiment of the pixel circuit of the present invention, as shown in fig. 6, the pixel circuit of the present embodiment is different from the embodiment shown in fig. 1 in that the first light emitting control sub-circuit 13 further includes a ninth transistor T9. A control electrode of the ninth transistor T9 and a control electrode of the fifth transistor T5 are used together as a second control terminal of the first light emitting control sub-circuit 13; the second pole of the ninth transistor T9 serves as the fourth terminal of the first light emitting control sub-circuit 13, and the first pole of the ninth transistor T9 is electrically connected to the second pole of the fifth transistor T5. A second pole of the eighth transistor T8 is electrically connected to the first terminal of the second emission control sub-circuit 14 through the ninth transistor T9.
In one implementation, the second transistor T2 is an oxide transistor; the first transistor T1, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, and the ninth transistor T9 are low-temperature polysilicon transistors. Alternatively, the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, and the ninth transistor T9 are oxide transistors; the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, the seventh transistor T7, and the ninth transistor T9 are low-temperature polysilicon transistors.
Fig. 7 is a topology diagram of still another embodiment of the pixel circuit according to the present invention, which differs from the pixel circuits shown in fig. 1 and 2 in that the pixel circuit further comprises an anode discharge sub-circuit 17. Of these, the pixel circuit of the present embodiment shows only the PWM sub-circuit 11, the second light emission control sub-circuit 14, and the anode discharge sub-circuit 17. Please refer to fig. 1 and fig. 2 for other structures and connection relationships, which are not described herein.
The first end of the anode discharge sub-circuit 17 is electrically connected with the third voltage signal end V3, the second end of the anode discharge sub-circuit 17 is electrically connected with the anode end of the light emitting device D, and the control end of the anode discharge circuit is electrically connected with the fifth scanning signal end. The third voltage signal terminal V3 may input the Vint signal.
In one specific implementation, the anode discharge subcircuit 17 includes a tenth transistor T10. A first pole of the tenth transistor T10 is used as a first terminal of the anode discharging sub-circuit 17, a second pole of the tenth transistor T10 is used as a second terminal of the anode discharging sub-circuit 17, and a control pole of the tenth transistor T10 is used as a control terminal of the anode discharging sub-circuit 17. The tenth transistor T10 may be a low temperature polysilicon transistor.
The first pole of the tenth transistor T10 is electrically connected to the third voltage signal terminal V3, the second pole of the tenth transistor T10 is electrically connected to the anode terminal of the light emitting device D, and the control pole of the tenth transistor T10 is electrically connected to the fifth scan signal terminal.
In a specific implementation process, the fifth scanning signal terminal and the second scanning signal terminal G2 may be the same signal terminal or different signal terminals.
The embodiment of the invention also provides a driving method of the pixel circuit, which comprises the following steps:
in the reset stage, the second scan signal terminal G2 controls the conduction of the reset compensation sub-circuit 12, and the first light-emitting signal control terminal E1 controls the conduction of the second terminal of the first light-emitting control sub-circuit 13 and the first voltage signal terminal V1, so that the control terminal of the driving sub-circuit 15 resets;
in the writing compensation stage, the PAM sub-circuit 10 is controlled to be turned on by a first scanning signal terminal G1, the reset compensation sub-circuit 12 is controlled to be turned on by a second scanning signal terminal G2, the second terminal of the first light-emitting control sub-circuit 13 is controlled to be disconnected from the first voltage signal terminal V1 by the first light-emitting signal control terminal E1, a PAM signal is written into the control terminal of the driving sub-circuit 15 and subjected to threshold compensation, the PWM sub-circuit 11 is controlled to be turned on by the third scanning signal terminal G3, and a PWM signal is written into the control terminal of the second light-emitting control sub-circuit 14 to control the second light-emitting control sub-circuit 14 to be turned on or off;
In the light emission control stage, the first light emission control circuit is controlled to be turned on through the first light emission control signal terminal and the second light emission control signal terminal E2, and the driving current generated by the driving sub-circuit 15 is transmitted to the second light emission control sub-circuit 14; and if the PWM signal can control the second light-emitting control sub-circuit 14 to be conducted, controlling the light-emitting device D to emit light, and if the PWM signal controls the second light-emitting control sub-circuit 14 to be disconnected, controlling the light-emitting device D not to emit light.
In a specific implementation process, the driving method of the pixel circuit is characterized by further comprising:
in the light emission control stage, the first light emission control sub-circuit 13 is controlled to be turned on according to a preset frequency through the second light emission control signal terminal E2.
The embodiment of the invention also provides a display substrate, which can comprise the pixel circuit of the embodiment.
The embodiment of the invention also provides a display device, which can comprise the display substrate of the embodiment.
It is to be understood that the same or similar parts in the above embodiments may be referred to each other, and that in some embodiments, the same or similar parts in other embodiments may be referred to.
Those skilled in the art will appreciate that the transistors used in all embodiments of the present invention may be thin film transistors or field effect transistors or other devices having the same characteristics. Since the source and drain of the transistor used herein are symmetrical, the source and drain may be interchanged. In the embodiment of the invention, the gate electrode is used as a control electrode, one electrode is called a first electrode, and the other electrode is called a second electrode, wherein the first electrode can be a source electrode or a drain electrode, and the second electrode can be a drain electrode or a source electrode, so as to distinguish the two electrodes except the gate electrode of the transistor.
It should be noted that in the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "plurality" means at least two.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments of the present invention are disclosed above, the embodiments are only used for the convenience of understanding the present invention, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is still subject to the scope of the present disclosure as defined by the appended claims.
Claims (10)
1. The pixel circuit is characterized by comprising a pulse amplitude modulation sub-circuit, a pulse width modulation sub-circuit, a reset compensation sub-circuit, a first light-emitting control sub-circuit, a second light-emitting control sub-circuit, a driving sub-circuit, a reset sub-circuit and a first capacitor;
the first end of the pulse amplitude modulation subcircuit is electrically connected with a pulse amplitude modulation signal end, the control end of the pulse amplitude modulation subcircuit is electrically connected with a first scanning signal end, and the second end of the pulse amplitude modulation subcircuit is electrically connected with the first end of the driving subcircuit and the first end of the first light-emitting subcircuit;
the first end of the reset compensation sub-circuit is electrically connected with the second end of the driving sub-circuit and the second end of the first light-emitting control sub-circuit, the second end of the reset compensation sub-circuit is electrically connected with the control end of the driving sub-circuit, and the control end of the reset compensation sub-circuit is electrically connected with the second scanning signal end;
The first control end of the first light-emitting control sub-circuit is electrically connected with the first light-emitting signal control end, the second control end of the first light-emitting control sub-circuit is electrically connected with the second light-emitting signal control end, the third end of the first light-emitting control sub-circuit is electrically connected with the first voltage signal end, and the fourth end of the first light-emitting control sub-circuit is electrically connected with the first end of the second light-emitting control sub-circuit; the second end of the second light-emitting control sub-circuit is electrically connected with the anode end of the light-emitting device;
the first end of the pulse width modulation subcircuit is electrically connected with a pulse width modulation signal end, the second end of the pulse width modulation subcircuit is electrically connected with the control end of the second light-emitting control subcircuit, and the control end of the pulse width modulation subcircuit is electrically connected with a third scanning signal end;
the reset compensation sub-circuit is used for resetting or threshold compensation of the control end of the driving sub-circuit under the control of the second scanning signal end;
the first light-emitting control sub-circuit is used for transmitting the driving current generated by the driving sub-circuit to the second light-emitting control sub-circuit under the control of the first light-emitting signal control end and the second light-emitting signal control end, and controlling the conduction time of a first current path between the first voltage signal end and the second light-emitting control sub-circuit;
The pulse width modulation sub-circuit is used for transmitting a pulse width modulation signal of the pulse width modulation signal end to the second light-emitting control sub-circuit under the control of the third scanning signal end so as to control the on-time of the second light-emitting control sub-circuit;
a first electrode of the eighth transistor is electrically connected with the second voltage signal end, a second electrode of the eighth transistor is electrically connected with the first end of the second light-emitting control sub-circuit, and a control electrode of the eighth transistor is electrically connected with the fourth scanning signal end;
the first end of the first capacitor is electrically connected with the control end of the driving sub-circuit; two ends of the first capacitor are electrically connected with the second pole of the eighth transistor.
2. The pixel circuit of claim 1, further comprising an anode discharge circuit;
the first end of the anode discharging sub-circuit is electrically connected with the third voltage signal end, the second end of the anode discharging sub-circuit is electrically connected with the anode end of the light emitting device, and the control end of the anode discharging sub-circuit is electrically connected with the fifth scanning signal end.
3. The pixel circuit according to claim 2, wherein the anode discharge sub-circuit includes a tenth transistor;
A first pole of the tenth transistor is used as a first end of the anode discharging sub-circuit, a second pole of the tenth transistor is used as a second end of the anode discharging sub-circuit, and a control pole of the tenth transistor is used as a control end of the anode discharging sub-circuit;
the first electrode of the tenth transistor is electrically connected with the third voltage signal terminal, the second electrode of the tenth transistor is electrically connected with the anode terminal of the light emitting device, and the control electrode of the tenth transistor is electrically connected with the fifth scanning signal terminal.
4. The pixel circuit of claim 1, wherein the pulse-width modulation subcircuit comprises a fourth transistor, the pulse-width modulation subcircuit comprises a sixth transistor and a second capacitor, the reset compensation subcircuit comprises a second transistor, the first light-emitting control subcircuit comprises a first transistor and a fifth transistor, the second light-emitting control subcircuit comprises a seventh transistor, the drive subcircuit comprises a third transistor;
a first pole of the fourth transistor is used as a first end of the pulse amplitude modulation subcircuit, a second pole of the fourth transistor is used as a second end of the pulse amplitude modulation subcircuit, and a control pole of the fourth transistor is used as a control end of the pulse amplitude modulation subcircuit;
A first electrode of the second transistor is used as a first end of the reset compensation sub-circuit, a second electrode of the second transistor is used as a second end of the reset compensation sub-circuit, and a control electrode of the second transistor is used as a control end of the reset compensation sub-circuit;
the control electrode of the first transistor is used as a first control end of the first light-emitting control sub-circuit, the first electrode of the first transistor is used as a third end of the first light-emitting control sub-circuit, and the second electrode of the first transistor is used as a second end of the first light-emitting control sub-circuit; the control electrode of the fifth transistor is used as the second control end of the first light-emitting control sub-circuit, the first electrode of the fifth transistor is used as the first end of the first light-emitting control sub-circuit, and the second electrode of the fifth transistor is used as the fourth end of the first light-emitting control sub-circuit;
the control electrode of the sixth transistor is used as the control end of the pulse width modulation subcircuit, the first electrode of the sixth transistor is used as the first end of the pulse width modulation subcircuit, and the second electrode of the sixth transistor is used as the second end of the pulse width modulation subcircuit;
A first pole of the seventh transistor is used as a first end of the second light-emitting control sub-circuit, a second pole of the seventh transistor is used as a second end of the second light-emitting control sub-circuit, and control of the seventh transistor is used as a control end of the second light-emitting control sub-circuit;
a first pole of the third transistor is used as a first end of the driving sub-circuit, a second pole of the third transistor is used as a second end of the driving sub-circuit, and a control pole of the third transistor is used as a control end of the driving sub-circuit;
a first electrode of the fourth transistor is electrically connected with the pulse amplitude modulation signal end, a control electrode of the fourth transistor is electrically connected with the first scanning signal end, and a second electrode of the fourth transistor is electrically connected with the first electrode of the third transistor and the first electrode of the fifth transistor;
the first electrode of the second transistor is electrically connected with the second electrode of the third transistor and the second electrode of the first transistor, the second electrode of the second transistor is electrically connected with the control electrode of the third transistor, and the control electrode of the second transistor is electrically connected with the second scanning signal end;
The control electrode of the first transistor is electrically connected with the first light-emitting signal control end, the control electrode of the fifth transistor is electrically connected with the second light-emitting signal control end, the first electrode of the first transistor is electrically connected with the first voltage signal end, and the second electrode of the fifth transistor is electrically connected with the first electrode of the seventh transistor; a second electrode of the seventh transistor is electrically connected with the anode terminal of the light emitting device;
the first electrode of the sixth transistor is electrically connected with the pulse width modulation signal end, the control electrode of the sixth transistor is electrically connected with the third scanning signal end, and the second electrode of the sixth transistor is electrically connected with the control electrode of the seventh transistor and the first end of the second capacitor; the second end of the second capacitor is electrically connected with the fourth voltage signal end.
5. The pixel circuit of claim 4, wherein the first light emitting control sub-circuit further comprises a ninth transistor;
a control electrode of the ninth transistor and a control electrode of the fifth transistor are used as a second control end of the first light-emitting control sub-circuit together;
the second pole of the ninth transistor is used as the fourth terminal of the first light emitting control sub-circuit, and the first pole of the ninth transistor is electrically connected with the second pole of the fifth transistor.
6. The pixel circuit according to claim 5, wherein the second transistor is an oxide transistor; the first transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor and the ninth transistor are low-temperature polysilicon transistors; or alternatively
The first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor, and the ninth transistor are oxide transistors; or alternatively
The first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, the seventh transistor and the ninth transistor are low-temperature polysilicon transistors.
7. A driving method of a pixel circuit according to any one of claims 1 to 6, comprising:
in the resetting stage, the resetting compensation subcircuit is controlled to be conducted through the second scanning signal end, and the second end of the first luminous control subcircuit is controlled to be conducted with the first voltage signal end through the first luminous signal control end, so that the control end of the driving subcircuit is reset;
In the writing compensation stage, the pulse amplitude modulation subcircuit is controlled to be conducted through a first scanning signal end, the reset compensation subcircuit is controlled to be conducted through a second scanning signal end, the second end of the first light-emitting control subcircuit is controlled to be disconnected from the first voltage signal end through the first light-emitting signal control end, a pulse amplitude modulation signal is written into the control end of the driving subcircuit and subjected to threshold compensation, the pulse width modulation subcircuit is controlled to be conducted through the third scanning signal end, and a pulse width modulation signal is written into the control end of the second light-emitting control subcircuit so as to control the second light-emitting control subcircuit to be conducted or disconnected;
in the light-emitting control stage, the first light-emitting control circuit is controlled to be conducted through the first light-emitting signal control end and the second light-emitting control signal end, and driving current generated by the driving sub-circuit is transmitted to the second light-emitting control sub-circuit; and if the pulse width modulation signal can control the second light-emitting control sub-circuit to be conducted, controlling the light-emitting device to emit light, and if the pulse width modulation signal controls the second light-emitting control sub-circuit to be disconnected, controlling the light-emitting device not to emit light.
8. The method for driving a pixel circuit according to claim 7, further comprising:
in the light-emitting control stage, the first light-emitting control sub-circuit is controlled to be conducted according to a preset frequency through the second light-emitting control signal end.
9. A display substrate comprising the pixel circuit according to any one of claims 1 to 6.
10. A display device comprising the display substrate according to claim 9.
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| CN114664234B (en) * | 2022-03-17 | 2023-06-30 | Tcl华星光电技术有限公司 | Hybrid driving method of display and hybrid driving module of display |
| WO2024045116A1 (en) * | 2022-09-01 | 2024-03-07 | 京东方科技集团股份有限公司 | Pixel circuit, pixel driving method, and display apparatus |
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| CN113096589A (en) * | 2021-04-08 | 2021-07-09 | 中国科学院微电子研究所 | Pixel circuit, driving method of pixel circuit and display device |
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| CN110310594B (en) * | 2019-07-22 | 2021-02-19 | 京东方科技集团股份有限公司 | Display panel and display device |
| KR102599715B1 (en) * | 2019-08-21 | 2023-11-09 | 삼성디스플레이 주식회사 | Pixel circuit |
| CN110491335A (en) * | 2019-09-03 | 2019-11-22 | 京东方科技集团股份有限公司 | A kind of driving circuit and its driving method, display device |
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