CN113409728B - Driving circuit and driving method of screen pixels and display panel - Google Patents
Driving circuit and driving method of screen pixels and display panel Download PDFInfo
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- CN113409728B CN113409728B CN202110650021.8A CN202110650021A CN113409728B CN 113409728 B CN113409728 B CN 113409728B CN 202110650021 A CN202110650021 A CN 202110650021A CN 113409728 B CN113409728 B CN 113409728B
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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
- 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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a driving circuit, a driving method and a display panel of screen pixels, wherein the driving circuit comprises a signal storage sub-circuit and a driving sub-circuit; the storage sub-circuit comprises a switch module, a balance module and a storage module; the first end of the switch module is configured to be connected into a data signal through the balance module, and the second end of the switch module is connected to the storage module through the driving sub-circuit; the balancing module is also configured to access the operating voltage and the data signal; the driving sub-circuit comprises a driving module, the control end of the driving module is connected with the storage module, the input end of the driving module is configured to be connected with working voltage, and the output end of the driving module is connected to the organic light emitting diode. The balancing module can balance the voltage at two ends of the switch module in the light-emitting stage, so that the leakage current of the switch module can be reduced, the stability of the driving current of the driving module is improved, the organic light-emitting diode is prevented from generating badness, no additional process treatment is needed, and the process and time cost is reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to a driving circuit and a driving method of screen pixels and a display panel.
Background
In a conventional 7T1C structure driving circuit, compensation optimization is performed on the threshold voltage of a Thin Film Transistor (TFT) to be driven, and the leakage current of the TFT is generally reduced by aging with a large current. However, when the device is influenced by external environment, such as electrostatic friction, an electrostatic field is generated, so that the threshold voltage of the thin film transistor is positively biased, and the leakage current of the switching thin film transistor corresponding to the input data signal is increased in the light emitting stage, so that the working Voltage (VDD) of the device is reduced; when loaded onto an OLED (Organic Light-Emitting Diode) pixel, a poor picture appears. The technical scheme adopted at the present stage is to coat electrostatic liquid on a mobile phone screen so as to lead out the generated electrostatic liquid, thereby solving the problems brought by electrostatic places. However, the electrostatic solution coating process increases the manufacturing cost and the process time, and the electrostatic solution coating process also has the risk of poor recurrence.
Therefore, the prior art has the disadvantages of high process cost and long time when solving the poor picture phenomenon caused by the positive bias of the threshold voltage of the thin film transistor.
Disclosure of Invention
In view of the above problems, the present invention provides a driving circuit and a driving method for a screen pixel, and a display panel, which solve the undesirable phenomena of green emission and the like of the display panel caused by forward bias of a threshold voltage, and do not need to perform additional process treatment, thereby reducing the process cost and avoiding the increase of the process time.
In a first aspect, the present application provides the following technical solutions through an embodiment:
a drive circuit for a screen pixel, comprising: a signal storage sub-circuit and a drive sub-circuit; wherein: the storage sub-circuit comprises a switch module, a balance module and a storage module; the first end of the switch module is configured to access a data signal through the balancing module, and the second end of the switch module is connected to the storage module through the driving sub-circuit; the balancing module is configured to switch in an operating voltage and the data signal; the driving sub-circuit comprises a driving module, a control end of the driving module is connected with the storage module, an input end of the driving module is configured to be connected with working voltage, and an output end of the driving module is connected to the organic light emitting diode; when the driving circuit is in a reset stage, the storage module is initialized; when the driving circuit is in a signal writing stage, the data signal is written into the storage module; when the driving circuit is in a light-emitting stage, the balancing module balances the voltages at two ends of the switch module, and the driving module drives the organic light-emitting diode.
Optionally, the switching module includes a first thin film transistor, and the balancing module includes a second thin film transistor and a third thin film transistor; the source electrode of the first thin film transistor is connected with the drain electrode of the third thin film transistor, the drain electrode of the first thin film transistor is connected with the storage module, the source electrode of the third thin film transistor is configured to be connected with a data signal, the source electrode of the second thin film transistor is configured to be connected with an operating voltage, and the drain electrode of the second thin film transistor is configured to be connected with the source electrode of the first thin film transistor.
Optionally, the storage module includes a storage capacitor; the first plate of the storage capacitor is connected to the drain electrode of the first thin film transistor; the first plate of the storage capacitor is configured to be connected with an initialization voltage, and the second plate of the storage capacitor is configured to be connected with a working voltage.
Optionally, the driving module includes a fourth thin film transistor; the grid electrode of the fourth thin film transistor is connected to the storage module, the source electrode of the fourth thin film transistor is configured to be connected to an operating voltage, and the drain electrode of the fourth thin film transistor is connected to the organic light emitting diode.
Optionally, the signal storage sub-circuit further includes a fifth thin film transistor; and the source electrode of the fifth thin film transistor is connected with the drain electrode of the fourth thin film transistor, and the drain electrode of the fifth thin film transistor is connected with the storage module.
Optionally, the signal storage sub-circuit further includes a sixth thin film transistor; the source electrode of the sixth thin film transistor is configured to be connected with an initialization voltage, and the drain electrode of the sixth thin film transistor is connected with the storage module.
Optionally, the driving sub-circuit further includes a seventh thin film transistor; the source electrode of the seventh thin film transistor is configured to be connected with an operating voltage, and the drain electrode of the seventh thin film transistor is connected with the input end of the driving module.
Optionally, the driving sub-circuit further includes an eighth thin film transistor; and the source electrode of the eighth thin film transistor is connected with the output end of the driving module, and the drain electrode of the eighth thin film transistor is connected with the organic light emitting diode.
In a second aspect, based on the same inventive concept, the present application provides the following technical solutions through an embodiment:
a method for driving a screen pixel, applied to the driving circuit of any one of the above first aspects, the method comprising:
controlling the storage module to initialize at the reset stage of the driving circuit; writing the data signal into the memory module when the driving circuit is in a write phase; and when the driving circuit is in a light-emitting stage, controlling the driving module to drive the organic light-emitting diode, and controlling the balancing module to balance the voltage at the two ends of the switch module.
Optionally, the switching module includes a first thin film transistor, and the balancing module includes a second thin film transistor and a third thin film transistor; the source electrode of the first thin film transistor is connected with the drain electrode of the third thin film transistor, the drain electrode of the first thin film transistor is connected with the storage module, the source electrode of the third thin film transistor is configured to be connected with a data signal, the source electrode of the second thin film transistor is configured to be connected with an operating voltage, and the drain electrode of the second thin film transistor is configured to be connected with the source electrode of the first thin film transistor; the method further comprises the following steps:
when the driving circuit is in a reset stage, controlling the first thin film transistor and the second thin film transistor to be closed; when the drive circuit is in a writing stage, controlling a first thin film transistor and a third thin film transistor to be turned on; and when the driving circuit is in a light-emitting stage, the first thin film transistor and the third thin film transistor are controlled to be closed, and the second thin film transistor is controlled to be opened.
Optionally, the driving module includes a fourth thin film transistor; the grid electrode of the fourth thin film transistor is connected to the storage module, the source electrode of the fourth thin film transistor is configured to be connected to an operating voltage, and the drain electrode of the fourth thin film transistor is connected to an organic light emitting diode; the method comprises the following steps:
when the driving circuit is in a reset stage, controlling the fourth thin film transistor to be closed; and when the driving circuit is in a light-emitting stage, controlling the fourth thin film transistor to be turned on.
Optionally, the signal storage sub-circuit further includes a fifth thin film transistor; the source electrode of the fifth thin film transistor is connected with the drain electrode of the fourth thin film transistor, and the drain electrode of the fifth thin film transistor is connected with the storage module; the method further comprises the following steps:
when the driving circuit is in a reset stage and a light-emitting stage, the fifth thin film transistor is controlled to be turned off; and when the driving circuit is in a writing stage, the fifth thin film transistor is controlled to be turned on.
In a third aspect, based on the same inventive concept, the present application provides the following technical solutions through an embodiment:
a display panel comprising a drive circuit for a screen pixel as described in any one of the first to fourth aspects.
The embodiment of the invention provides a driving circuit, a driving method and a display panel of screen pixels, wherein a storage sub-circuit comprises a switch module, a balance module and a storage module; the first end of the switch module is configured to be connected with a data signal through the balance module, and the second end of the switch module is connected to the storage module through the driving sub-circuit; the balancing module is configured to access the working voltage and the data signal; the driving sub-circuit comprises a driving module, the control end of the driving module is connected with the storage module, the input end of the driving module is configured to be connected with working voltage, and the output end of the driving module is connected to the organic light emitting diode. The balancing module can balance the voltages at two ends of the switch module in the light-emitting stage, so that the leakage current of the switch module can be reduced, and the stability of the driving current of the driving module is improved, thereby avoiding the undesirable phenomena of green generation and the like of the organic light-emitting diode; in addition, the scheme does not need additional process treatment, reduces the process cost and avoids increasing the process time.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts. In the drawings:
FIG. 1 is a functional block diagram of a driving circuit of a screen pixel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a driving circuit of a screen pixel according to an embodiment of the present invention;
FIG. 3 is a flow chart of a driving method of a screen pixel according to an embodiment of the present invention;
FIG. 4 illustrates an exemplary timing diagram of signals in an embodiment of the present invention;
FIG. 5 is a diagram showing states of TFTs in a driving circuit of a screen pixel during a reset phase in the embodiment of the present invention;
FIG. 6 is a diagram showing states of TFTs in a driving circuit of a screen pixel during a writing phase in the embodiment of the present invention;
fig. 7 is a schematic diagram showing the states of the thin film transistors in the driving circuit of the screen pixel during the light-emitting stage in the embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
First embodiment
In this embodiment, there is provided a driving circuit of a screen pixel, including: a signal storage sub-circuit and a drive sub-circuit.
Referring to fig. 1, the memory sub-circuit includes a switch module 10, a balancing module 20 and a memory module 30; a first end of the switch module 10 is configured to access the data signal through the balancing module 20, and a second end of the switch module 10 is connected to the storage module 30 through the driving sub-circuit; balancing module 20 is further configured to switch in an operating voltage and a data signal; the driving sub-circuit comprises a driving module 40, a control terminal of the driving module 40 is connected to the storage module 30, an input terminal of the driving module 40 is configured to be connected to an operating voltage, and an output terminal of the driving module 40 is connected to the organic light emitting diode.
When the organic light emitting diode OLED is driven to work, the method is divided into three stages: a reset phase, a write phase and a light emitting phase.
When the driving circuit is in the reset phase, the memory module 30 is initialized; when the driving circuit is in the signal writing stage, the data signal is written into the storage module 30; when the driving circuit is in the light emitting stage, the balancing module 20 balances the voltage across the switching module 10, and the driving module 40 drives the organic light emitting diode. The balancing module 20 balances voltages at two ends of the switch module 10 in the light emitting stage, so that leakage current of the switch module 10 can be reduced, and stability of driving current of the driving module 40 can be improved, thereby preventing the organic light emitting diode from generating defects.
Further, the driving circuit of the screen pixel in this embodiment has the following implementation modes:
please refer to fig. 2, in which: the switching module 10 includes a first thin film transistor T1, and the balancing module 20 includes a second thin film transistor T2 and a third thin film transistor T3; the source of the first thin film transistor T1 is connected to the drain of the third thin film transistor T3, the drain of the first thin film transistor T1 is connected to the memory module 30, the source of the third thin film transistor T3 is configured to switch in a data signal, the source of the second thin film transistor T2 is configured to switch in an operating voltage, and the drain of the second thin film transistor T2 is connected to the source of the first thin film transistor T1. When the driving circuit is in a reset stage, the first thin film transistor T1 and the second thin film transistor T2 are closed; when the driving circuit is in a signal writing stage, the first thin film transistor T1 and the third thin film transistor T3 are turned on; when the driving circuit is in the light emitting stage, the first thin film transistor T1 and the third thin film transistor T3 are turned off, and the second thin film transistor T2 is turned on.
The storage module 30 includes a storage capacitor Cst; a first plate of the storage capacitor Cst is connected to the drain of the first thin film transistor T1; the first plate of the storage capacitor Cst is also coupled to an initialization voltage, and the second plate of the storage capacitor Cst is configured to couple to an operating voltage. The driving module 40 includes a fourth thin film transistor T4; the gate of the fourth tft T4 is connected to the storage module 30, e.g., may be connected to the first plate of the storage capacitor Cst; the source of the fourth thin film transistor T4 is configured to switch on the operating voltage, the drain of the fourth thin film transistor T4 is connected to the organic light emitting diode, and particularly, the drain of the fourth thin film transistor T4 is connected to the anode of the organic light emitting diode. When the driving circuit is in the reset stage, the fourth thin film transistor T4 is turned off; when the driving circuit is in the light-emitting stage, the fourth thin film transistor T4 is turned on.
When the driving circuit is in the reset phase, the first thin film transistor T1, the second thin film transistor T2, and the fourth thin film transistor T4 are turned off, and the voltage of the first plate of the storage capacitor Cst is initialized to the initialization voltage.
When the driving circuit is in the signal writing stage, i.e., when the threshold voltage compensation is performed, the first thin film transistor T1 and the third thin film transistor T3 are turned on to write the data signal into the first plate of the storage capacitor Cst.
When the driving circuit is in the light emitting phase, the first thin film transistor T1 and the third thin film transistor T3 are turned off, and the second thin film transistor T2 and the fourth thin film transistor T4 are turned on. After the first thin film transistor T1 and the third thin film transistor T3 are turned off, a data signal cannot be input, and the source and the drain of the first thin film transistor T1 can be simultaneously set to a high level because the second thin film transistor T2 is turned on; therefore, vds =0 for the first thin film transistor T1. At this time, the leakage current is small, and the influence of the positive or negative bias of the threshold voltage of the first thin film transistor T1 on the magnitude of the current in the fourth thin film transistor T4 is negligible. The driving current in the fourth thin film transistor T4 as the driving transistor is stable, so that the organic light emitting diode OLED can stably operate, and the phenomenon of the display panel being green or the like can be effectively avoided.
The signal storage sub-circuit may further include a fifth thin film transistor T5; the source electrode of the fifth thin film transistor T5 is connected to the drain electrode of the fourth thin film transistor T4, and the drain electrode of the fifth thin film transistor T5 is connected to the storage module 30; such as to the first plate of the storage capacitor Cst. When the driving circuit is in the reset stage and the light-emitting stage, the fifth thin film transistor T5 is turned off; when the driving circuit is in the writing phase, the fifth thin film transistor T5 is turned on. By controlling the fifth thin film crystal, it can be ensured that the data signal can be effectively written into the first plate of the storage capacitor Cst.
The signal storage sub-circuit may further include a sixth thin film transistor T6; the source of the sixth thin film transistor T6 is configured to switch in the initialization voltage, and the drain of the sixth thin film transistor T6 is connected to the storage module 30, such as the first plate of the storage capacitor Cst. When the driving circuit is in the reset stage, the sixth thin film transistor T6 is turned on; when the driving circuit is in the writing phase and the light emitting phase, the sixth thin film transistor T6 is turned off. By controlling the sixth thin film transistor T6, it can be ensured that the storage capacitor Cst can be correctly reset in the reset phase.
The driving sub-circuit may further include a seventh thin film transistor T7; the source of the seventh thin film transistor T7 is configured to switch on the working voltage, and the drain of the seventh thin film transistor T7 is connected to the input terminal of the driving module 40, specifically, to the source of the fourth thin film transistor T4. When the driving circuit is in the reset stage and the write-in stage, the seventh thin film transistor T7 is turned off; when the driving circuit is in the light-emitting stage, the seventh thin film transistor T7 is turned on. By controlling the seventh thin film transistor T7, it is ensured that the fourth thin film transistor T4 is supplied with the operating voltage during the light emitting stage, and the operating voltage is turned off during the other stages, so that the first plate of the storage capacitor Cst is reset, and the data signal is effectively written.
The driving sub-circuit may further include an eighth thin film transistor T8; a source of the eighth thin film transistor T8 is connected to the output end of the driving module 40, and specifically, may be connected to a drain of the fourth thin film transistor T4; the drain electrode of the eighth thin film transistor T8 is connected to the anode electrode of the organic light emitting diode OLED. When the driving circuit is in the reset stage and the write-in stage, the eighth thin film transistor T8 is turned off; when the driving circuit is in the light-emitting stage, the eighth thin film transistor T8 is turned on. By controlling the eighth thin film transistor T8, it can be ensured that the anode of the organic light emitting diode OLED can be effectively initialized before entering the light emitting phase.
The driving sub-circuit may further include a ninth thin film transistor T9; a source electrode of the ninth thin film transistor T9 is configured to be switched in the initialization voltage; the drain electrode of the ninth thin film transistor T9 is connected to the anode electrode of the organic light emitting diode OLED. When the driving circuit is in the reset stage and the light-emitting stage, the ninth thin film transistor T9 is turned off; when the driving circuit is in the writing phase, the ninth thin film transistor T9 is turned on. By controlling the ninth thin film transistor T9, it is ensured that the anode of the light emitting diode is initialized effectively in the writing stage.
Furthermore, in order to ensure that each thin film transistor is accurately controlled, the driving circuit can achieve corresponding effects at different stages. In the present embodiment, the gates of the first thin film transistor T1, the third thin film transistor T3, the fifth thin film transistor T5, and the ninth thin film transistor T9 are all configured to switch in the scan control signal; the second thin film transistor T2, the seventh thin film transistor T7, and the eighth thin film transistor T8 are all configured to be switched in a light emission control signal; the sixth thin film transistor T6 is configured to turn on the reset signal. The scanning control signal, the light-emitting control signal, the reset signal and the data signal can all come from a time schedule controller of the display panel. In addition, the thin film transistors in this embodiment may all adopt P-type thin film transistors, and a Low Temperature Polysilicon (LTPS) technology may be adopted to prepare the driving circuit, so as to ensure the stability of the circuit.
In different implementation manners, the driving circuit of the screen pixel in this embodiment may be optimally applied to the driving circuits such as 5T1C, 6T1C, 7T1C, and 7T 2C.
Referring to fig. 3, based on the same inventive concept, the present embodiment further provides a method for driving a screen pixel, which is applied to the driving circuit of the screen pixel, and specifically, the method includes:
step S10: and controlling the storage module to initialize in the reset stage of the driving circuit.
Step S20: and when the drive circuit is in a writing phase, writing the data signal into the storage module.
Step S30: and when the driving circuit is in a light-emitting stage, controlling the driving module to drive the organic light-emitting diode, and controlling the balancing module to balance the voltage at the two ends of the switch module.
Specifically, in step S10, when the driving circuit is in the reset phase, the first thin film transistor T1, the second thin film transistor T2, the fourth thin film transistor T4, the fifth thin film transistor T5, the seventh thin film transistor T7, the eighth thin film transistor T8, and the ninth thin film transistor T9 may be specifically controlled to be turned off, and the sixth thin film transistor T6 is turned on, so that the voltage of the first plate of the storage capacitor Cst is initialized to the initialization voltage.
In step S20, the first thin film transistor T1, the third thin film transistor T3, and the ninth thin film transistor T9 may be specifically controlled to be turned on, and the fifth thin film transistor T5, the sixth thin film transistor T6, the seventh thin film transistor T7, and the eighth thin film transistor T8 are specifically controlled to be turned off, so that the data signal is written into the first plate of the storage capacitor Cst.
In step S30, the first thin film transistor T1, the third thin film transistor T3, the sixth thin film transistor T6 and the ninth thin film transistor T9 may be specifically controlled to be turned off, and the second thin film transistor T2, the fourth thin film transistor T4, the seventh thin film transistor T7 and the eighth thin film transistor T8 may be controlled to be turned on, so as to drive the organic light emitting diode OLED to emit light.
As shown in fig. 4, the control process of the above steps S10 to S30 is performed by the scan control signal, the Emission control signal, and the Reset signal, and fig. 4 shows a timing chart of each stage of the scan control signal (Gate), the Emission control signal (EM), the Reset signal (Reset), and the Data signal (Data). In the foregoing driving method for the screen pixel, the implementation manner of each step and the beneficial effects thereof can be referred to the related description in the foregoing driving circuit for the screen pixel, and are not described again.
In order to make the technical solution provided by this embodiment easier to understand, the control and principle of the driving circuit of the screen pixel of this embodiment are further described by way of example below. The following:
in the reset phase (the first phase), please refer to fig. 5, the sixth tft T6 is controlled to be turned on, the fourth tft T4 is also turned on, the first tft T1, the second tft T2, the third tft T3, the fifth tft T5, the seventh tft T7, the eighth tft T8, and the ninth tft T9 are controlled to be turned off, the second plate of the capacitor is always connected to the working voltage VDD, so that the node Vs' = VDD is kept constant, and the voltage of the first plate is guaranteed to be stable. In this stage, the node Vg = Vinit, and the nodes Vs1 and Vs2 are in a floating (floating) state, and the state of the previous lighting stage is retained: vs1= Vs2= VDD; where Vinit is the initialization voltage.
In the writing phase (second phase), referring to fig. 6, the reset signal is switched, and at this time, the sixth thin film transistor T6 is controlled to be turned off, the node Vg = Vinit, and the fourth thin film transistor T4 is kept in the on state. The scan control signal is converted, the first thin film transistor T1, the third thin film transistor T3, and the fifth thin film transistor T5 are turned on, the second thin film transistor T2, the seventh thin film transistor T7, and the eighth thin film transistor T8 are kept turned off, and the Vdata signal is sequentially written to the first plate of the storage capacitor Cst through the third thin film transistor T3, the first thin film transistor T1, the fourth thin film transistor T4, and the fifth thin film transistor T5. With the writing of the data signal, the signal at the node Vg gradually rises until Vg = Vdata + Vth, the fourth thin film transistor T4 is turned off, the signal writing is completed, and Vth is the threshold voltage of the fourth thin film transistor T4. Further, the Gate signal is switched, and is switched simultaneously with the Reset signal (Reset n + 1) of the next row, and the ninth thin film transistor is turned on, so that the initialization voltage Vinit signal is written onto the anode of the organic light emitting diode OLED, and the anode signal of the organic light emitting diode OLED is initialized.
In the light emitting phase (the third phase), referring to fig. 7, the scan control signal is switched, the first thin film transistor T1, the third thin film transistor T3, the fifth thin film transistor T5 and the ninth thin film transistor T9 are turned off, and the voltage at the node Vg is maintained at Vg = Vdata + Vth. EM signal conversion, the second thin film transistor T2, the seventh thin film transistor T7, and the eighth thin film transistor T8 are turned on, and the node voltage Vs1 is converted from Vdata to VDD; and node Vs2= VDD, there is Vs1= Vs2= VDD. Therefore, for the positive or negative bias of the threshold voltage of the first thin film transistor T1, the voltage difference Vds =0V between the source and the drain of the first thin film transistor T1 is balanced, so that the leakage current is small, the influence on the driving current I of the fourth thin film transistor T4 is small, and the undesirable phenomenon such as green of the display panel caused by the positive bias of the threshold voltage of the first thin film transistor T1 is improved.
In summary, in the driving circuit of the screen pixel provided in this embodiment, the storage sub-circuit includes a switch module, a balance module and a storage module; the first end of the switch module is configured to be connected into a data signal through the balance module, and the second end of the switch module is connected to the storage module through the driving sub-circuit; the balancing module is configured to access the working voltage and the data signal; the driving sub-circuit comprises a driving module, the control end of the driving module is connected with the storage module, the input end of the driving module is configured to be connected with working voltage, and the output end of the driving module is connected to the organic light emitting diode. The balancing module can balance the voltage at two ends of the switch module in the light-emitting stage, so that the leakage current of the switch module can be reduced, and the stability of the driving current of the driving module is improved, thereby avoiding the generation of poor organic light-emitting diodes; in addition, the scheme does not need additional process treatment, reduces the process cost and avoids increasing the process time.
Second embodiment
Based on the same inventive concept, a second embodiment of the present invention provides a display panel including the driving circuit of any one of the screen pixels in the first embodiment.
It should be noted that the display panel provided in the embodiment of the present invention has the same technical effects as those of the foregoing method embodiments, and for the sake of brief description, reference may be made to corresponding contents in the foregoing method embodiments for the portions of the embodiment of the apparatus that are not mentioned.
The term "and/or" appearing herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship; the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
In the description of the present invention, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (12)
1. A driver circuit for a screen pixel, comprising: a signal storage sub-circuit and a drive sub-circuit; wherein:
the storage sub-circuit comprises a switch module, a balance module and a storage module; the first end of the switch module is configured to access a data signal through the balancing module, and the second end of the switch module is connected to the storage module through the driving sub-circuit; the balancing module is configured to switch in an operating voltage and the data signal;
the driving sub-circuit comprises a driving module, a control end of the driving module is connected with the storage module, an input end of the driving module is configured to be connected with working voltage, and an output end of the driving module is connected to the organic light emitting diode;
when the driving circuit is in a reset stage, the storage module is initialized; when the drive circuit is in a signal writing stage, the data signal is written into the storage module; when the driving circuit is in a light-emitting stage, the balancing module balances the voltages at two ends of the switch module, and the driving module drives the organic light-emitting diode;
wherein the switching module comprises a first thin film transistor, and the balancing module comprises a second thin film transistor and a third thin film transistor; the source electrode of the third thin film transistor is configured to be connected with a data signal, the source electrode of the first thin film transistor is connected with the drain electrode of the third thin film transistor, the source electrode of the second thin film transistor is configured to be connected with an operating voltage, and the drain electrode of the second thin film transistor is connected with the source electrode of the first thin film transistor; the second thin film transistor is configured to write an operating voltage between the first thin film transistor and the third thin film transistor in the light emission phase to suppress the first thin film transistor caused by the data signalInThe leakage current of (2).
2. The driving circuit according to claim 1, wherein the storage module comprises a storage capacitor; the first plate of the storage capacitor is connected to the drain electrode of the first thin film transistor; the first plate of the storage capacitor is configured to be connected with an initialization voltage, and the second plate of the storage capacitor is configured to be connected with a working voltage.
3. The driving circuit according to claim 1, wherein the driving module comprises a fourth thin film transistor; the grid electrode of the fourth thin film transistor is connected to the storage module, the source electrode of the fourth thin film transistor is configured to be connected to an operating voltage, and the drain electrode of the fourth thin film transistor is connected to the organic light emitting diode.
4. The driving circuit of claim 3, wherein the signal storage sub-circuit further comprises a fifth thin film transistor; and the source electrode of the fifth thin film transistor is connected with the drain electrode of the fourth thin film transistor, and the drain electrode of the fifth thin film transistor is connected with the storage module.
5. The driving circuit according to claim 1, wherein the signal storage sub-circuit further comprises a sixth thin film transistor; the source electrode of the sixth thin film transistor is configured to be connected with an initialization voltage, and the drain electrode of the sixth thin film transistor is connected with the storage module.
6. The driving circuit according to claim 1, wherein the driving sub-circuit further comprises a seventh thin film transistor; the source electrode of the seventh thin film transistor is configured to be connected with an operating voltage, and the drain electrode of the seventh thin film transistor is connected with the input end of the driving module.
7. The driving circuit according to claim 1, wherein the driving sub-circuit further comprises an eighth thin film transistor; and the source electrode of the eighth thin film transistor is connected with the output end of the driving module, and the drain electrode of the eighth thin film transistor is connected with the organic light emitting diode.
8. A driving method of a screen pixel, applied to the driving circuit of any one of the claims 1 to 7, comprising:
controlling the storage module to initialize in a reset stage of the driving circuit;
writing the data signal into the memory module when the driving circuit is in a write phase;
and when the driving circuit is in a light-emitting stage, controlling the driving module to drive the organic light-emitting diode, and controlling the balancing module to balance the voltage at the two ends of the switch module.
9. The driving method according to claim 8, wherein the switching module includes a first thin film transistor, and the balancing module includes a second thin film transistor and a third thin film transistor; the source electrode of the first thin film transistor is connected with the drain electrode of the third thin film transistor, the drain electrode of the first thin film transistor is connected with the storage module, the source electrode of the third thin film transistor is configured to be connected with a data signal, the source electrode of the second thin film transistor is configured to be connected with an operating voltage, and the drain electrode of the second thin film transistor is configured to be connected with the source electrode of the first thin film transistor; the method further comprises the following steps:
when the driving circuit is in a reset stage, controlling the first thin film transistor and the second thin film transistor to be closed;
when the driving circuit is in a writing stage, controlling a first thin film transistor and a third thin film transistor to be turned on;
and when the driving circuit is in a light-emitting stage, the first thin film transistor and the third thin film transistor are controlled to be closed, and the second thin film transistor is controlled to be opened.
10. The driving method according to claim 9, wherein the driving module includes a fourth thin film transistor; the grid electrode of the fourth thin film transistor is connected to the storage module, the source electrode of the fourth thin film transistor is configured to be connected to an operating voltage, and the drain electrode of the fourth thin film transistor is connected to an organic light emitting diode; the method comprises the following steps:
when the driving circuit is in a reset stage, controlling the fourth thin film transistor to be closed;
and when the driving circuit is in a light-emitting stage, controlling the fourth thin film transistor to be turned on.
11. The driving method according to claim 10, wherein the signal storage sub-circuit further includes a fifth thin film transistor; the source electrode of the fifth thin film transistor is connected with the drain electrode of the fourth thin film transistor, and the drain electrode of the fifth thin film transistor is connected with the storage module; the method further comprises the following steps:
when the driving circuit is in a reset stage and a light-emitting stage, the fifth thin film transistor is controlled to be turned off;
and when the drive circuit is in a writing stage, the fifth thin film transistor is controlled to be turned on.
12. A display panel comprising a drive circuit for a screen pixel as claimed in any one of claims 1 to 7.
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| KR100816471B1 (en) * | 2006-09-07 | 2008-03-26 | 재단법인서울대학교산학협력재단 | Pixel structure for active matrix device |
| KR101097325B1 (en) * | 2009-12-31 | 2011-12-23 | 삼성모바일디스플레이주식회사 | A pixel circuit and a organic electro-luminescent display apparatus |
| CN107424555B (en) * | 2017-05-23 | 2021-08-24 | 上海和辉光电股份有限公司 | Pixel circuit, driving method and display |
| CN108538242A (en) * | 2018-01-26 | 2018-09-14 | 上海天马有机发光显示技术有限公司 | Pixel-driving circuit and its driving method, display panel and display device |
| CN110910825B (en) * | 2019-12-10 | 2021-04-02 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN211062442U (en) * | 2020-01-17 | 2020-07-21 | 昆山国显光电有限公司 | Pixel circuit and display panel |
| CN111261111A (en) * | 2020-03-13 | 2020-06-09 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit, driving method thereof and display panel |
| CN111883044B (en) * | 2020-07-31 | 2022-09-13 | 昆山国显光电有限公司 | Pixel circuit and display device |
| CN111816119B (en) * | 2020-08-31 | 2022-02-25 | 武汉天马微电子有限公司 | Display panel and display device |
| CN112382235A (en) * | 2020-12-01 | 2021-02-19 | 合肥维信诺科技有限公司 | Pixel circuit, control method thereof and display panel |
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