CN111739470B - Pixel driving circuit, driving method and display panel - Google Patents
Pixel driving circuit, driving method and display panel Download PDFInfo
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- CN111739470B CN111739470B CN202010738448.9A CN202010738448A CN111739470B CN 111739470 B CN111739470 B CN 111739470B CN 202010738448 A CN202010738448 A CN 202010738448A CN 111739470 B CN111739470 B CN 111739470B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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Abstract
The application discloses a pixel driving circuit, a driving method and a display panel. The pixel driving circuit includes: the device comprises a driving transistor, an energy storage capacitor, an initialization module, a data writing module, a charging module, a compensation module and a light emitting module, wherein the grid electrode of the driving transistor is connected with the data writing module, the first pole of the driving transistor is connected with the compensation module, and the second pole of the driving transistor is connected with the light emitting module; the first pole of the energy storage capacitor is connected with the charging module, and the second pole of the energy storage capacitor is connected with the driving transistor; the initialization module writes a first voltage signal into the anode of the light-emitting diode under the action of the first signal; the data writing module writes a data signal into the grid electrode of the driving transistor under the action of the first signal; the charging module charges the energy storage capacitor under the action of the first signal; the compensation module enables the voltage of the grid electrode and the first electrode of the driving transistor to generate sudden change under the action of the first signal and the second signal; and the light-emitting module is connected with the driving transistor and the light-emitting diode under the action of the third signal.
Description
Technical Field
The present disclosure relates generally to the field of display technologies (e.g., computer technologies), and more particularly, to a pixel driving circuit, a driving method, and a display panel.
Background
An OLED (Organic Light-Emitting Diode) semiconductor display gradually replaces an LCD to become the mainstream of the semiconductor display industry due to the advantages of low driving power consumption, self-luminescence of materials, high Light-Emitting conversion efficiency, short response time, low cost, and the like. Driving Thin Film Transistor (DTFT) threshold due to instability of existing fabrication processThe voltage is deviated, which causes the driving current of the light emitting diode to be unstable. In addition, the attenuation of the power voltage VDD causes the imbalance of the driving current of each led, for example, the driving current of the led having a larger power voltage VDD near the driver chip is larger than the driving current of the led having a smaller power voltage VDD far from the driver chip. Thus, the light emitting diode is subjected to a threshold voltage and a supply voltage VDDThe unstable influence causes the instability of the driving current of the light emitting diode, thereby causing the problems of uneven brightness and poor stability (mura) of the screen of the OLED display screen.
Disclosure of Invention
The present invention provides a pixel driving circuit and a driving method for a display panel, so as to compensate for a threshold voltage Vth, so that a driving current flowing through an electroluminescent device is not affected by the threshold voltage Vth of a driving transistor, and further, the driving current is not affected by an unstable power voltage.
In a first aspect, a pixel driving circuit is provided, including: a driving transistor, an energy storage capacitor, an initialization module, a data writing module, a charging module, a compensation module and a light-emitting module,
the grid electrode of the driving transistor is connected with the data writing module, the first pole of the driving transistor is connected with the compensation module, and the second pole of the driving transistor is connected with the light-emitting module;
the first pole of the energy storage capacitor is connected with the charging module, and the second pole of the energy storage capacitor is connected with the first pole of the driving transistor;
the initialization module writes a first voltage signal into the anode of the light-emitting diode under the action of the first signal so as to eliminate residual charges on the anode of the light-emitting diode;
the data writing module writes a data signal into the grid electrode of the driving transistor under the action of the first signal;
the charging module charges the energy storage capacitor under the action of the first signal;
the compensation module enables the voltage of the grid electrode and the first electrode of the driving transistor to change suddenly under the action of the first signal and the second signal;
and the light-emitting module is used for conducting the connection between the driving transistor and the light-emitting diode under the action of the third signal.
In some embodiments, the initialization module includes a seventh transistor, a gate of the seventh transistor receives the first signal, a first pole of the seventh transistor is connected to the anode of the light emitting diode, and a second pole of the seventh transistor is connected to the first voltage signal.
In some embodiments, the data writing module includes a first transistor, a gate of the first transistor receives the first signal, a first pole of the first transistor is connected to the data signal, and a second pole of the first transistor is connected to the gate of the driving transistor.
In some embodiments, the charging module includes a fourth transistor, a gate of the fourth transistor receives the first signal, a first pole of the fourth transistor is connected to the second voltage signal, and a second pole of the fourth transistor is connected to the first pole of the energy storage capacitor.
In some embodiments, the compensation module includes a fifth transistor and a second transistor,
a grid electrode of the fifth transistor receives the second signal, a first pole of the fifth transistor is connected with the third voltage signal, and a second pole of the fifth transistor is connected with the first pole of the driving transistor;
the grid electrode of the second transistor receives the first signal, the first pole of the second transistor is connected with the first pole of the energy storage capacitor, and the second pole of the second transistor is connected with the grid electrode of the driving transistor.
In some embodiments, the light emitting module includes a sixth transistor, a gate of the sixth transistor receives the third signal, a first pole of the sixth transistor is connected to the second pole of the driving transistor, and the second pole of the sixth transistor is connected to the anode of the light emitting diode.
In some embodiments of the present invention, the,
the initialization module comprises a seventh transistor, wherein the grid electrode of the seventh transistor receives a first signal, the first pole of the seventh transistor is connected with the anode of the light-emitting diode, and the second pole of the seventh transistor is connected with a first voltage signal;
the data writing module comprises a first transistor, wherein the grid electrode of the first transistor receives a first signal, the first pole of the first transistor is connected with the data signal, and the second pole of the first transistor is connected with the grid electrode of the driving transistor;
the charging module comprises a fourth transistor, the grid electrode of the fourth transistor receives a first signal, the first pole of the fourth transistor is connected with a second voltage signal, and the second pole of the fourth transistor is connected with the first pole of the energy storage capacitor;
the compensation module comprises a fifth transistor and a second transistor, wherein the grid electrode of the fifth transistor receives a second signal, the first pole of the fifth transistor is connected with a third voltage signal, and the second pole of the fifth transistor is connected with the first pole of the driving transistor; a grid electrode of the second transistor receives a first signal, a first electrode of the second transistor is connected with a first electrode of the energy storage capacitor, and a second electrode of the second transistor is connected with a grid electrode of the driving transistor;
the light emitting module comprises a sixth transistor, a grid electrode of the sixth transistor receives a third signal, a first pole of the sixth transistor is connected with a second pole of the driving transistor, and the second pole of the sixth transistor is connected with the anode of the light emitting diode.
In some embodiments, the first voltage is a negative voltage.
In a second aspect, a driving method of a pixel driving circuit provided in embodiments of the present application includes the following stages:
in the first stage, the initialization module writes a first voltage signal into the anode of the light-emitting diode under the action of a first signal; the data writing module writes a data signal into the grid electrode of the driving transistor under the action of the first signal; the charging module charges the energy storage capacitor under the action of the first signal; the compensation module pulls up the voltage of the first pole of the driving transistor under the action of the second signal; and the light emitting module disconnects the driving transistor from the light emitting diode under the action of the third signal.
In the second stage, the initialization module drives the second pole of the transistor to be connected with the first voltage signal under the action of the first signal; the data writing module writes a data signal into the grid electrode of the driving transistor under the action of the first signal; the charging module charges the energy storage capacitor under the action of the first signal; the compensation module disconnects the energy storage capacitor from the driving transistor and disconnects the driving transistor from the third voltage under the action of the first signal and the second signal, so that the first voltage of the driving transistor is pulled down; and the light-emitting module is used for conducting the connection between the driving transistor and the light-emitting diode under the action of the third signal.
In the third stage, the initialization module disconnects the second pole of the driving transistor from the first voltage signal under the action of the first signal; the data writing module is used for disconnecting the data signal from the grid electrode of the driving transistor under the action of the first signal; the charging module disconnects charging to the energy storage capacitor under the action of the first signal; under the action of the first signal and the second signal, the compensation module drives a grid electrode and a first electrode of the transistor to be respectively connected with a first electrode and a third voltage signal of the energy storage capacitor, and the voltage of the first electrode of the driving transistor is pulled high; and the light-emitting module is used for conducting the connection between the driving transistor and the light-emitting diode under the action of the third signal.
In a third aspect, a display panel is provided, which includes the pixel driving circuit provided in the embodiments of the present application.
According to the technical scheme provided by the embodiment of the application, under the action of the first signal and the second signal, the voltage of the grid electrode and the first electrode of the driving transistor jumps, so that the problem of unstable driving current caused by threshold voltage deviation in a pixel driving circuit and the problem of unbalanced driving current caused by uneven power supply voltage can be solved, and the uniformity and the stability of the display brightness of the display screen are ensured.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 shows an exemplary structural block diagram of a pixel driving circuit according to an embodiment of the present application;
fig. 2 shows an exemplary flowchart of a driving method of a pixel driving circuit according to an embodiment of the present application;
FIG. 3 illustrates an exemplary timing diagram of a pixel drive circuit according to an embodiment of the present application;
fig. 4 to 6 show specific exemplary schematic diagrams of a driving method of the pixel driving circuit according to the stages in fig. 2.
Fig. 7 shows a simulation diagram of the pixel driving circuit of fig. 1 based on the timing diagram of fig. 3.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, fig. 1 shows an exemplary structural block diagram of a pixel driving circuit according to an embodiment of the present application. A pixel driving circuit includes: a driving transistor T3, a storage capacitor C1, an initialization module 101, a data writing module 102, a charging module 103, a compensation module 104 and a light emitting module 105,
the gate of the driving transistor T3 is connected to the data writing module 102, the first pole is connected to the compensation module 104, and the second pole is connected to the light emitting module 105;
a first pole of the energy storage capacitor C1 is connected to the charging module 103, and a second pole is connected to the first pole of the driving transistor T3;
the initialization module 101 writes the first voltage signal Vsus to the anode of the led D1 under the action of the first signal S1 to eliminate the residual charge on the anode of the led D1;
the data writing module 102 writes the data signal Vdata to the gate of the driving transistor T3 under the action of the first signal S1;
the charging module 103 charges the energy storage capacitor C1 under the action of the first signal S1;
the compensation module 104 makes the voltage of the gate and the first pole of the driving transistor T3 change abruptly under the action of the first signal S1 and the second signal S2;
the light emitting module 105 turns on the connection between the driving transistor T3 and the light emitting diode D1 under the action of the third signal S3.
According to the technical scheme provided by the embodiment of the application, under the action of the first signal and the second signal, the voltage of the grid electrode and the first electrode of the driving transistor jumps, so that the driving current of the light emitting diode is as follows:
where K is (keeper)/L, W is the channel width of the driving transistor T3, L is the channel length of the driving transistor T3, μ is the electron mobility of the driving transistor T3, and Cox is the capacitance of the storage capacitor C1. Therefore, the magnitude of the driving current is not influenced by the threshold voltage of the driving transistor and the power supply voltage VDD, and the problem of unstable driving current in the pixel driving circuit can be solved. Specifically, the driving current of the light emitting diode is not affected by the threshold voltage, and thus, the driving current of each light emitting diode is stabilized, and thus the luminance of each light emitting diode is stabilized. In addition, the driving current of the light emitting diode is not affected by the power voltage VDD, so the driving current of the light emitting diode is the same at each position of the display panel, and the brightness of the light emitting diode is uniform and has no difference at each position of the display panel. For example, the driving current of the light emitting diode with a larger power supply voltage VDD near the driver chip is the same as the driving current of the light emitting diode with a smaller power supply voltage VDD far from the driver chip, and the light emitting luminance is the same.
The specific structure of each module is described one by one below.
The initialization module 101 includes a seventh transistor T7, a gate of the seventh transistor T7 receiving the first signal S1, a first pole connected to the anode of the light emitting diode D1, and a second pole connected to the first voltage signal Vsus;
the data writing module 102 includes a first transistor T1, a gate of the first transistor T1 receiving a first signal S1, a first pole connected to the data signal Vdata, and a second pole connected to the gate of the driving transistor T3;
the charging module 103 includes a fourth transistor T4, a gate of the fourth transistor T4 receives the first signal S1, a first pole of the fourth transistor T4 is connected to the second voltage signal Vref, and a second pole of the fourth transistor T4 is connected to the first pole of the energy storage capacitor C1;
the compensation module 104 includes a fifth transistor T5 and a second transistor T2, the gate of the fifth transistor T5 receives the second signal S1, the first pole is connected to the third voltage signal VDD, and the second pole is connected to the first pole of the driving transistor T3; the gate of the second transistor T2 receives the first signal S1, the first pole is connected to the first pole of the energy storage capacitor C1, and the second pole is connected to the gate of the driving transistor T3;
the light emitting module 105 includes a sixth transistor T6, a gate of the sixth transistor T6 receiving the third signal S3, a first pole connected to the second pole of the driving transistor T3, and a second pole connected to the anode of the light emitting diode D1.
Wherein the first voltage is a negative voltage; the second transistor is an NMOS transistor;
the first transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, and the seventh transistor are PMOS transistors. Other configurations of the transistors may also be used, and are not limited herein.
The operation of the pixel driving circuit of fig. 1 is described in detail in fig. 2 to 6.
Fig. 2 shows an exemplary flowchart of a driving method of a pixel driving circuit according to an embodiment of the present application. The driving method comprises the following stages:
step S101: in the first stage, the initialization module writes a first voltage signal into the anode of the light-emitting diode under the action of a first signal; the data writing module writes a data signal into the grid electrode of the driving transistor under the action of the first signal; the charging module charges the energy storage capacitor under the action of the first signal; the compensation module pulls up the voltage of the first pole of the driving transistor under the action of the second signal; and the light-emitting module disconnects the driving transistor from the light-emitting diode under the action of the third signal.
Step S102: in the second stage, the initialization module conducts connection between the second pole of the driving transistor and the first voltage signal under the action of the first signal; the data writing module writes a data signal into the grid electrode of the driving transistor under the action of the first signal; the charging module charges the energy storage capacitor under the action of the first signal; the compensation module disconnects the energy storage capacitor from the driving transistor and disconnects the driving transistor from the third voltage under the action of the first signal and the second signal, so that the first voltage of the driving transistor is pulled down; and the light-emitting module is used for conducting the connection between the driving transistor and the light-emitting diode under the action of the third signal.
Step S103: in the third stage, the initialization module disconnects the second pole of the driving transistor from the first voltage signal under the action of the first signal; the data writing module is used for disconnecting the data signal from the grid electrode of the driving transistor under the action of the first signal; the charging module disconnects charging to the energy storage capacitor under the action of the first signal; under the action of the first signal and the second signal, the energy storage capacitor is connected with the driving transistor, and the first voltage of the driving transistor is suddenly changed to be equal to the third voltage signal; and the light-emitting module is used for conducting the connection between the driving transistor and the light-emitting diode under the action of the third signal.
Each stage will be described below with reference to fig. 3 and 4 to 6. Fig. 3 shows an exemplary timing diagram of a pixel driving circuit according to an embodiment of the present application; fig. 4 to 6 show specific exemplary schematic diagrams of a driving method of the pixel driving circuit according to each stage in fig. 2.
As shown in fig. 3 and 4, in the first phase t1, when the first signal S1 is at a low level, the second signal S2 is at a low level, and the third signal S3 is at a high level, the seventh transistor with the gate connected to the first signal S1 is turned on, so that the first voltage signal negative voltage signal is transmitted to the anode of the light emitting diode D1 to eliminate the residual charge on the anode of the light emitting diode; the first transistor with the gate connected to the first signal S1 is turned on, and the data signal Vdata is written into the gate of the driving transistor T3; the fourth transistor with the gate connected to the first signal S1 is turned on, and charges the energy of the first voltage Vref to the energy storage capacitor C1; the fifth transistor with the gate connected to the second signal S2 is turned on, so that the voltage of the first electrode of the driving transistor is equal to the first voltage VDD, and the second transistor with the gate connected to the first signal S1 is turned off, thereby disconnecting the first electrode of the energy storage capacitor C1 from the driving transistor T3; the sixth transistor having its gate connected to the third signal S3 is turned off, disconnecting the driving transistor from the light emitting diode. For the sake of convenience of the drawing, the transistor is in an off state as indicated by oblique lines in fig. 4, and the flow of current is indicated by a dotted arrow.
As shown in fig. 3 and 5, in the second stage T2, when the first signal S1 is at a low level, the second signal S2 is at a high level, and the third signal S3 is at a low level, the seventh transistor T7 having a gate connected to the first signal S1 is turned on, so that the second pole of the driving transistor T3 is connected to the first voltage signal Vsus; the first transistor with the gate connected to the first signal S1 is turned on, and writes the data signal into the gate of the driving transistor T3; the fourth transistor with the gate connected to the first signal S1 is turned on, and charges the energy of the first voltage Vref to the energy storage capacitor C1; the fifth transistor with the gate connected to the second signal S2 is turned off, so that the connection between the first electrode of the driving transistor and the first voltage VDD is disconnected, the second transistor with the gate connected to the first signal S1 is turned on and off, and the connection between the first electrode of the energy storage capacitor C1 and the driving transistor T3 is disconnected; the sixth transistor with the gate connected to the third signal S3 is turned on, and the driving transistor is connected to the light emitting diode. For the sake of convenience of the drawing, the transistor is in an off state as indicated by oblique lines in fig. 5, and the flow of current is indicated by a dotted arrow. At this time, when the voltage of the first electrode of the driving transistor drops from the voltage value of the third voltage VDD at the stage t1 to the voltage value Vdata-Vth, the driving transistor is turned off, and the pull-down of the voltage of the first electrode of the driving transistor is realized. It is understood that Vdata-Vth has a voltage value less than voltage VDD.
As shown in fig. 3 and 6, in the third stage T3, when the first signal S1 is at a high level, the second signal S2 is at a low level, and the third signal S3 is at a low level, the seventh transistor with the gate connected to the first signal S1 is turned off, and the second pole of the driving transistor T3 is disconnected from the first voltage signal Vsus; the first transistor with the gate connected to the first signal S1 is turned off, and the connection between the data signal and the gate of the driving transistor T3 is disconnected; the fourth transistor with the gate connected to the first signal S1 is turned off, and the connection between the first voltage Vref and the first pole of the energy storage capacitor C1 is disconnected; the fifth transistor T5 with the gate connected to the second signal S2 is turned on, the first voltage of the driving transistor T3 is equal to the first voltage VDD, the second transistor with the gate connected to the first signal S1 is turned on, and the first pole of the energy storage capacitor C1 is connected with the gate of the driving transistor T3; the sixth transistor with the gate connected to the third signal S3 is turned on, the driving transistor is connected to the light emitting diode, and the light emitting diode D1 drives the current ID1Under the action of (1), light is emitted. For the sake of convenience of the drawing, the transistor is in an off state as indicated by oblique lines in fig. 6, and the flow of current is indicated by a dotted arrow. At this time, the voltage of the first electrode of the driving transistor is suddenly changed from the voltage value Vdata-Vth at the stage t2 to the voltage VDD, the voltage change amount is VDD- (Vdata-Vth), and the second electrode of the energy storage capacitor C1 is connected with the first electrode of the driving transistor. Under the bootstrap action of the energy storage capacitor C1, the voltage variation of the two poles of the energy storage capacitor C1 is the same, i.e. the voltage variation of the first pole of the energy storage capacitor is VDD- (Vdata-Vth), so the voltage of the first pole of the energy storage capacitor C1 is Vref + [ VDD- (Vdata-Vth) ], where Vref is the voltage of the first pole of the energy storage capacitor at the stage t 2. The first pole of the energy storage capacitor is connected to the gate of the driving transistor T3, so the Vgs voltage of the driving transistor T3 is the voltage difference between the gate and the first pole of the driving transistor T3, i.e., Vgs ═ Vref + [ VDD- (Vdata-Vth) ] -VDD ═ Vref-Vdata + Vth. Thus, it is possible to provideDriving current ID1The following were used:
where k is (keeper)/L, W is the channel width formed by the driving transistor T3, L is the channel length formed by the driving transistor T3, μ is the electron mobility of the driving transistor T3, and Cox is the capacitance of the storage capacitor C1. It can be seen that the magnitude of the driving current is not affected by the threshold voltage Vth and the third voltage VDD, and varies with the voltage magnitude of the data signal Vdata. That is, the luminance of the light emitting diode D1 is not affected by the threshold voltage Vth and the third voltage VDD, and is adjusted according to the voltage level of the data signal Vdata. The uniformity and stability of the brightness of each LED are realized.
FIG. 7 is a simulation diagram of the timing diagram of the pixel driving circuit of FIG. 1 based on FIG. 3, where V isA、VBRespectively, the gate and first electrode voltages of the driving transistor T3 are shown, and Vanode and Ianode respectively show the anode voltage of the light emitting diode D1 and the driving current of the light emitting diode. As shown in FIG. 7, the voltage V for driving the transistor gate during the t1 and t2 phasesAIs negative and equal to Vdata, and the voltage V of the transistor gate at stage t3AIs Vref + [ VDD- (Vdata-Vth) ]; voltage V of first pole of driving transistor in t1 and t3 stagesBPulling up to VDD, and driving the first pole of the transistor at t2 stageBPulled down to Vdata-Vth. the voltage of the anode of the led D1 is low at the t1 and t2 stages, and there is no driving current on the led D1; at the stage t3, the voltage at the anode of the led D1 is at a high level equal to VDD, and a stable driving current is generated in the led D1.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (9)
1. A pixel driving circuit, comprising: a driving transistor, an energy storage capacitor, an initialization module, a data writing module, a charging module, a compensation module and a light-emitting module,
the grid electrode of the driving transistor is connected with the data writing module, the first pole of the driving transistor is connected with the compensation module, and the second pole of the driving transistor is connected with the light emitting module;
the first pole of the energy storage capacitor is connected with the charging module, and the second pole of the energy storage capacitor is connected with the first pole of the driving transistor;
the initialization module writes a first voltage signal into the anode of the light-emitting diode under the action of a first signal so as to eliminate residual charges on the anode of the light-emitting diode;
the data writing module writes a data signal into the grid electrode of the driving transistor under the action of the first signal;
the charging module charges the energy storage capacitor under the action of the first signal;
the compensation module enables the voltage of the grid electrode and the first electrode of the driving transistor to change suddenly under the action of the first signal and the second signal;
the light emitting module is electrically connected with the driving transistor and the light emitting diode under the action of a third signal, the light emitting module comprises a sixth transistor, the grid electrode of the sixth transistor receives the third signal, the first pole of the sixth transistor is connected with the second pole of the driving transistor, the second pole of the sixth transistor is connected with the anode of the light emitting diode,
the light emitting module is configured to disconnect the driving transistor and the light emitting diode and the initialization module under the action of a third signal in a first stage;
the light emitting module is configured to turn on the driving transistor and the initialization module under the action of a third signal in a second stage, so that the voltage value of the first electrode of the driving transistor is pulled down to Vdata-Vth from VDD in the first stage;
under the action of the first signal, a first pole of the initialization module is connected with the sixth transistor, so that a second pole of the driving transistor is connected with the first voltage signal.
2. The pixel driving circuit according to claim 1, wherein the initialization module comprises a seventh transistor, a gate of the seventh transistor receives the first signal, a first pole of the seventh transistor is connected to the anode of the light emitting diode, and a second pole of the seventh transistor is connected to the first voltage signal.
3. The pixel driving circuit according to claim 1, wherein the data writing module comprises a first transistor, a gate of the first transistor receives the first signal, a first pole of the first transistor is connected to the data signal, and a second pole of the first transistor is connected to the gate of the driving transistor.
4. The pixel driving circuit according to claim 1, wherein the charging module comprises a fourth transistor, a gate of the fourth transistor receives the first signal, a first pole of the fourth transistor is connected to the second voltage signal, and a second pole of the fourth transistor is connected to the first pole of the energy storage capacitor.
5. The pixel driving circuit according to claim 1, wherein the compensation module comprises a fifth transistor and a second transistor,
a grid electrode of the fifth transistor receives the second signal, a first pole of the fifth transistor is connected with the third voltage signal, and a second pole of the fifth transistor is connected with the first pole of the driving transistor;
and the grid electrode of the second transistor receives the first signal, the first pole of the second transistor is connected with the first pole of the energy storage capacitor, and the second pole of the second transistor is connected with the grid electrode of the driving transistor.
6. The pixel driving circuit according to claim 1,
the initialization module comprises a seventh transistor, wherein a grid electrode of the seventh transistor receives the first signal, a first pole of the seventh transistor is connected with the anode of the light-emitting diode, and a second pole of the seventh transistor is connected with the first voltage signal;
the data writing module comprises a first transistor, the grid electrode of the first transistor receives the first signal, the first pole of the first transistor is connected with the data signal, and the second pole of the first transistor is connected with the grid electrode of the driving transistor;
the charging module comprises a fourth transistor, the grid electrode of the fourth transistor receives the first signal, the first pole of the fourth transistor is connected with the second voltage signal, and the second pole of the fourth transistor is connected with the first pole of the energy storage capacitor;
the compensation module comprises a fifth transistor and a second transistor, wherein the grid electrode of the fifth transistor receives the second signal, the first pole of the fifth transistor is connected with the third voltage signal, and the second pole of the fifth transistor is connected with the first pole of the driving transistor; the grid electrode of the second transistor receives the first signal, the first pole of the second transistor is connected with the first pole of the energy storage capacitor, and the second pole of the second transistor is connected with the grid electrode of the driving transistor;
the light emitting module comprises a sixth transistor, a grid electrode of the sixth transistor receives a third signal, a first pole of the sixth transistor is connected with a second pole of the driving transistor, and the second pole of the sixth transistor is connected with the anode of the light emitting diode.
7. The pixel driving circuit according to claim 6,
the first voltage is a negative voltage.
8. A method of driving a pixel driving circuit according to any one of claims 1 to 7, comprising the following stages:
in the first stage, the initialization module writes a first voltage signal into the anode of the light-emitting diode under the action of the first signal; the data writing module writes a data signal into the grid electrode of the driving transistor under the action of the first signal; the charging module charges the energy storage capacitor under the action of the first signal; the compensation module pulls up the voltage of the first pole of the driving transistor under the action of the second signal; the light emitting module disconnects the driving transistor from the light emitting diode under the action of a third signal;
in the second stage, under the action of the first signal, the second pole of the driving transistor is connected with a first voltage signal by the initialization module; the data writing module writes a data signal into the grid electrode of the driving transistor under the action of the first signal; the charging module charges the energy storage capacitor under the action of the first signal; the compensation module disconnects the energy storage capacitor from the driving transistor and disconnects the driving transistor from a third voltage under the action of the first signal and the second signal, so that a first voltage of the driving transistor is pulled low; the light emitting module is used for conducting connection between the driving transistor and the light emitting diode under the action of a third signal, the light emitting module comprises a sixth transistor, a grid electrode of the sixth transistor receives the third signal, a first pole of the sixth transistor is connected with a second pole of the driving transistor, the second pole of the sixth transistor is connected with an anode of the light emitting diode, a first pole of the initialization module is connected with the sixth transistor under the action of the third signal, so that the second pole of the driving transistor is connected with a first voltage signal to conduct the driving transistor and the initialization module, and the voltage value of the first pole of the driving transistor is reduced from VDD in a first stage to Vdata-Vth;
in a third stage, the initialization module disconnects the second pole of the driving transistor from the first voltage signal under the action of the first signal; the data writing module is used for disconnecting the connection between the data signal and the grid electrode of the driving transistor under the action of the first signal; the charging module disconnects charging to the energy storage capacitor under the action of the first signal; under the action of the first signal and the second signal, the grid electrode and the first electrode of the driving transistor are respectively connected with the first electrode and the third voltage signal of the energy storage capacitor, and the first electrode voltage of the driving transistor is pulled high; and the light-emitting module conducts the connection between the driving transistor and the light-emitting diode under the action of the third signal.
9. A display panel comprising the pixel drive circuit according to any one of claims 1 to 7.
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| CN115985239B (en) * | 2021-10-14 | 2024-10-22 | 上海和辉光电股份有限公司 | Pixel circuit, driving method thereof and organic light emitting display device |
| CN114078430A (en) * | 2021-12-09 | 2022-02-22 | 武汉华星光电半导体显示技术有限公司 | Pixel circuit and display panel |
| CN115440163B (en) * | 2022-11-09 | 2023-01-03 | 惠科股份有限公司 | Pixel driving circuit, pixel driving method and display device |
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