CN111489697A - Pixel circuit with voltage compensation function, driving method thereof and display panel - Google Patents
Pixel circuit with voltage compensation function, driving method thereof and display panel Download PDFInfo
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- CN111489697A CN111489697A CN202010533009.4A CN202010533009A CN111489697A CN 111489697 A CN111489697 A CN 111489697A CN 202010533009 A CN202010533009 A CN 202010533009A CN 111489697 A CN111489697 A CN 111489697A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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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
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- 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]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
Abstract
The invention discloses a pixel circuit with a voltage compensation function, a driving method thereof and a display panel, wherein the pixel circuit comprises a driving transistor, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, an energy storage unit, a coupling unit and a light emitting diode; one end of the driving transistor receives power supply voltage, the control end of the driving transistor is connected with the energy storage unit, the other end of the fifth switching tube and one end of the third switching tube, and the other end of the driving transistor is connected with the other end of the third switching tube and one end of the fourth switching tube; one end of the second switch tube receives the data signal, and the other end of the second switch tube is connected with one end of the coupling unit and one end of the first switch tube; the other end of the coupling unit is connected with one end of a fifth switching tube; the other end of the fourth switching tube is connected with the anode of the light-emitting diode; the cathode of the light emitting diode and the other end of the first switch tube are grounded. The pixel circuit provided by the invention meets the requirements of high resolution and narrow frame.
Description
Technical Field
The invention relates to the technical field of display control, in particular to a pixel circuit with a voltage compensation function, a driving method thereof and a display panel.
Background
In the field of AMO L ED (Active-matrix organic light-emitting diode) display, the backplane technology based on TFT (Thin Film Transistor) is becoming more and more critical, L TPS (L ow Temperature Poly-Silicon) TFT has become the preferred material for manufacturing medium-and small-sized AMO L ED display devices due to its advantages of high mobility and high stability.
In addition, in the pixel circuit based on the P-type L TPS TFT, the power voltage is input to the source of the driving transistor, which directly determines the magnitude of the driving current, but the power voltage at the end of the entire display panel close to the driving chip is higher than the power voltage at the end far from the driving chip due to the existence of the power line resistor, which seriously affects the uniformity of the current of the entire display panel.
Fig. 1 is a circuit diagram of a conventional pixel circuit having a voltage compensation function, and fig. 2 is a timing chart of control signals Scan1 to Scan3, a data signal VDATA, and a power supply voltage VDD in the pixel circuit. The pixel circuit can compensate for the threshold voltage and IR drop of the driving transistor and can be applied to a simultaneous light emission driving mode, but the control signal thereof is large and complicated. The control signals cause a large unit pixel area, and limit is caused to the realization of high resolution; the control signal is complex, the row driving technology of the array substrate is not easy to realize, and therefore the narrow frame effect in practical application is difficult to realize.
Disclosure of Invention
The invention aims to solve the problems that the existing pixel circuit which can be applied to a simultaneous light-emitting driving mode and has a voltage compensation function has more and complicated control signals.
The invention is realized by the following technical scheme:
a pixel circuit with a voltage compensation function comprises a driving transistor, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, an energy storage unit, a coupling unit and a light emitting diode;
one end of the driving transistor is used for receiving power supply voltage, a control end of the driving transistor is connected with the energy storage unit, the other end of the fifth switching tube and one end of the third switching tube, and the other end of the driving transistor is connected with the other end of the third switching tube and one end of the fourth switching tube;
one end of the second switch tube is used for receiving a data signal, and the other end of the second switch tube is connected with one end of the coupling unit and one end of the first switch tube;
the other end of the coupling unit is connected with one end of the fifth switching tube;
the other end of the fourth switching tube is connected with the anode of the light-emitting diode;
the cathode of the light emitting diode is grounded with the other end of the first switch tube;
the control end of the first switch tube and the control end of the third switch tube are used for receiving a first control signal, the control end of the second switch tube is used for receiving a second control signal, the control end of the fifth switch tube is used for receiving a third control signal, and the control end of the fourth switch tube is used for receiving a fourth control signal.
Optionally, the light emitting diode is Mini-L ED, Micro-L ED or O L ED.
Optionally, the energy storage unit includes a first capacitor;
one end of the first capacitor is connected with the control end of the driving transistor, the other end of the fifth switching tube and one end of the third switching tube, and the other end of the first capacitor is used for receiving the power supply voltage.
Optionally, the energy storage unit includes a first capacitor;
one end of the first capacitor is connected with the control end of the driving transistor, the other end of the fifth switching tube and one end of the third switching tube, and the other end of the first capacitor is grounded.
Optionally, the coupling unit includes a second capacitor;
one end of the second capacitor is used as one end of the coupling unit, and the other end of the second capacitor is used as the other end of the coupling unit.
Optionally, the driving transistor, the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, and the fifth switching tube are P-type thin film transistors;
one end of the driving transistor, one end of the first switch tube, one end of the second switch tube, one end of the third switch tube, one end of the fourth switch tube and one end of the fifth switch tube are source electrodes of the P-type thin film transistor, the other end of the driving transistor, the other end of the first switch tube, the other end of the second switch tube, the other end of the third switch tube, the other end of the fourth switch tube and the other end of the fifth switch tube are drain electrodes of the P-type thin film transistor, the control end of the driving transistor, the control end of the first switch tube, the control end of the second switch tube, the control end of the third switch tube, the control end of the fourth switch tube and the control end of the fifth switch tube are grids of the P-type thin film transistor.
Based on the same inventive concept, the present invention further provides a driving method of the pixel circuit, including:
in a voltage compensation stage, the first switching tube and the third switching tube are controlled to be switched on by the first control signal, the second switching tube is controlled to be switched off by the second control signal, the fifth switching tube is controlled to be switched on by the third control signal, and the fourth switching tube is controlled to be switched off by the fourth control signal;
in a data input stage after the voltage compensation stage, the first switching tube and the third switching tube are controlled to be cut off by the first control signal, the second switching tube is controlled to be switched on by the second control signal, the fifth switching tube is controlled to be switched on by the third control signal, and the fourth switching tube is controlled to be cut off by the fourth control signal;
in a data holding stage after the data input stage, the first switching tube and the third switching tube are controlled to be cut off by the first control signal, the second switching tube is controlled to be cut off by the second control signal, the fifth switching tube is controlled to be cut off by the third control signal, and the fourth switching tube is controlled to be cut off by the fourth control signal;
in a light emitting stage after the data holding stage, the first switching tube and the third switching tube are controlled to be turned off by the first control signal, the second switching tube is controlled to be turned off by the second control signal, the fifth switching tube is controlled to be turned off by the third control signal, and the fourth switching tube is controlled to be turned on by the fourth control signal.
Optionally, the first control signal and the second control signal are line scanning signals.
Based on the same inventive concept, the present invention further provides another driving method of the pixel circuit, including:
in a voltage compensation stage, the first switching tube and the third switching tube are controlled to be switched on by the first control signal, the second switching tube is controlled to be switched off by the second control signal, the fifth switching tube is controlled to be switched on by the third control signal, and the fourth switching tube is controlled to be switched off by the fourth control signal;
in a data input stage after the voltage compensation stage, the first switching tube and the third switching tube are controlled to be cut off by the first control signal, the second switching tube is controlled to be switched on by the second control signal, the fifth switching tube is controlled to be switched on by the third control signal, and the fourth switching tube is controlled to be cut off by the fourth control signal;
in a light emitting stage after the data input stage, the first switching tube and the third switching tube are controlled to be turned off by the first control signal, the second switching tube is controlled to be turned off by the second control signal, the fifth switching tube is controlled to be turned off by the third control signal, and the fourth switching tube is controlled to be turned on by the fourth control signal.
Based on the same inventive concept, the invention also provides a display panel, which comprises a pixel array, wherein the pixel array comprises a plurality of pixel circuits arranged in an array, and the pixel circuits are the pixel circuits.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the pixel circuit with the voltage compensation function comprises a driving transistor, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, an energy storage unit, a coupling unit and a light emitting diode, wherein the driving transistor and the third switching tube are connected in a mode of forming a diode structure, and the diode structure can fix power supply voltage received by the driving transistor in a voltage compensation stage. The control end of the driving transistor is charged by the power supply voltage, and the threshold voltage of the driving transistor can be detected, so that the finally obtained driving current is independent of the power supply voltage and the threshold voltage of the driving transistor, namely, the drift of the threshold voltage of the driving transistor and the reduction of the power supply voltage cannot influence the driving current, therefore, the pixel circuit provided by the invention can compensate the threshold voltage and the power supply voltage of the driving transistor, and the stability and the uniformity of the light emission of a display panel are improved.
The pixel circuit provided by the invention greatly reduces the possibility of electric leakage because the data signals are stored in the energy storage unit after being input, so that the data signals can be kept for a long time until all pixel data are input, and the pixel circuit provided by the invention not only can be applied to a traditional line-by-line light-emitting driving mode, but also can be compatible with a simultaneous light-emitting driving mode. In addition, the pixel circuit provided by the invention has simple control signals and small unit pixel area, and meets the requirements of strong compatibility and high resolution and narrow frame.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a circuit diagram of a pixel circuit having a compensation function according to the related art;
FIG. 2 is a timing diagram of control signals for the pixel circuit shown in FIG. 1;
FIG. 3 is a circuit diagram of a pixel circuit with voltage compensation according to an embodiment of the present invention;
FIG. 4 is a timing diagram of control signals applied to a simultaneous light-emitting driving mode by the pixel circuit according to the embodiment of the present invention;
FIG. 5 is a diagram illustrating a pixel circuit operating in a voltage compensation phase according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating a pixel circuit operating in a data input stage according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating a pixel circuit operating in a data retention phase according to an embodiment of the invention;
FIG. 8 is a diagram illustrating a pixel circuit operating in a light-emitting phase according to an embodiment of the invention;
fig. 9 is a timing diagram of control signals applied to a progressive light emission driving mode by the pixel circuit of the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
An embodiment of the present invention provides a pixel circuit with a voltage compensation function, and fig. 3 is a circuit diagram of the pixel circuit, where the pixel circuit includes a driving transistor T0, a first switching tube T1, a second switching tube T2, a third switching tube T3, a fourth switching tube T4, a fifth switching tube T5, an energy storage unit 31, a coupling unit 32, and a light emitting diode L ED.
One end of the driving transistor T0 is used for receiving a power voltage VDD, a control end of the driving transistor T0 is connected to the energy storage unit 31, the other end of the fifth switching tube T5 and one end of the third switching tube T3, and the other end of the driving transistor T0 is connected to the other end of the third switching tube T3 and one end of the fourth switching tube T4.
One end of the second switch transistor T2 is for receiving a data signal VDATA, and the other end of the second switch transistor T2 is connected to one end of the coupling unit 32 and one end of the first switch transistor T1, the other end of the coupling unit 32 is connected to one end of the fifth switch transistor T5, the other end of the fourth switch transistor T4 is connected to the anode of the light emitting diode L ED, the cathode of the light emitting diode L ED and the other end of the first switch transistor T1 are grounded.
The control end of the first switch tube T1 and the control end of the third switch tube T3 are configured to receive a first control signal S1, the control end of the second switch tube T2 is configured to receive a second control signal S2, the control end of the fifth switch tube T5 is configured to receive a third control signal S3, and the control end of the fourth switch tube T4 is configured to receive a fourth control signal S4.
In the embodiment of the present invention, the light emitting diode L ED may be a diode capable of emitting light, such as Mini-L ED, Micro-L ED or O L ED.
The energy storage unit 31 is configured to store the data signal VDATA after the data signal VDATA is input. As an alternative implementation, the energy storage unit 31 includes a first capacitor C1. One end of the first capacitor C1 is connected to the control terminal of the driving transistor T0, the other end of the fifth switching tube T5, and one end of the third switching tube T3, and the other end of the first capacitor C1 is used for receiving the power voltage VDD, that is, the other end of the first capacitor C1 is connected to one end of the driving transistor T0. As another alternative, the other end of the first capacitor C1 may also be grounded. The first capacitor C1 may be a single capacitor, or two or more capacitors may be connected in parallel.
The coupling unit 32 is used for coupling the signals received by it. In an embodiment of the present invention, the coupling unit 32 includes a second capacitor C2. One end of the second capacitor C2 serves as one end of the coupling unit 32, and the other end of the second capacitor C2 serves as the other end of the coupling unit 32. It should be noted that the coupling unit 32 may also be another circuit having a coupling function, which is not limited in the embodiment of the present invention.
In the embodiment of the present invention, the driving transistor T0, the first switching transistor T1, the second switching transistor T2, the third switching transistor T3, the fourth switching transistor T4 and the fifth switching transistor T5 are all P-type thin film transistors. One end of the driving transistor T0, one end of the first switching tube T1, one end of the second switching tube T2, one end of the third switching tube T3, one end of the fourth switching tube T4 and one end of the fifth switching tube T5 are sources of P-type thin film transistors, the other end of the driving transistor T0, the other end of the first switching tube T1, the other end of the second switching tube T2, the other end of the third switching tube T3, the other end of the fourth switching tube T4 and the other end of the fifth switching tube T5 are drains of P-type thin film transistors, the control end of the driving transistor T0, the control end of the first switching tube T1, the control end of the second switching tube T2, the control end of the third switching tube T3, the control end of the fourth switching tube T4 and the control end of the fifth switching tube T5 are gates of P-type thin film transistors. The driving transistor T0, the first switching transistor T1, the second switching transistor T2, the third switching transistor T3, the fourth switching transistor T4 and the fifth switching transistor T5 may be other types of transistors, such as a PMOS transistor or an NMOS transistor, for example, and the embodiment of the present invention is not limited thereto.
Fig. 4 is a timing diagram of control signals applied to the simultaneous light-emitting driving mode by the pixel circuit according to the embodiment of the present invention, and the following describes the operation principle of the pixel circuit according to the embodiment of the present invention applied to the simultaneous light-emitting driving mode with reference to fig. 3 to 8:
referring to fig. 5, during a voltage compensation period T1, the first switching transistor T1 and the third switching transistor T3 are controlled to be turned on by the first control signal S1, the second switching transistor T2 is controlled to be turned off by the second control signal S2, the fifth switching transistor T5 is controlled to be turned on by the third control signal S3, and the fourth switching transistor T4 is controlled to be turned off by the fourth control signal S4. The third switching transistor T3 is turned on so that the driving transistor T0 forms a diode connection. The voltage at the point a, i.e., the voltage at the control terminal of the driving transistor T0, is charged by the power voltage VDD through the driving transistor T0 until the driving transistor T0 is turned off, and is finally stabilized at VDD- | Vth1|, where Vth1 is the threshold voltage of the driving transistor T0; the voltage of the point B, that is, the voltage of the other terminal of the driving transistor T0 is equal to the voltage of the control terminal of the driving transistor T0; the voltage at point C is initialized to ground.
Referring to fig. 6, in a data input phase T2 after the voltage compensation phase T1, the first switch transistor T1 and the third switch transistor T3 are controlled to be turned off by the first control signal S1, the second switch transistor T2 is controlled to be turned on by the second control signal S2, the fifth switch transistor T5 is controlled to be turned on by the third control signal S3, and the fourth switch transistor T4 is controlled to be turned off by the fourth control signal S4. The second switch transistor T2 is turned on to let the data signal VDATA input, so that the voltage at point C changes from the ground voltage to the data signal VDATA. Due to the conservation of charge, the voltage at point a becomes by the action of the coupling unit 32
Referring to fig. 7, in a data holding period T3 after the data input period T2, the first switch transistor T1 and the third switch transistor T3 are controlled to be turned off by the first control signal S1, the second switch transistor T2 is controlled to be turned off by the second control signal S2, the fifth switch transistor T5 is controlled to be turned off by the third control signal S3, and the fourth switch transistor T4 is controlled to be turned off by the fourth control signal S4. During the data holding period T2, the data signal VDATA is stored at point a, waiting for all line scans to complete.
Referring to fig. 8, in a lighting period T4 after the data holding period T3, the first switching transistor T1 and the third switching transistor T3 are controlled to be turned off by the first control signal S1, the second switching transistor T2 is controlled to be turned off by the second control signal S2, the fifth switching transistor T5 is controlled to be turned off by the third control signal S3, and the fourth switching transistor T4 is controlled to be turned on by the fourth control signal S4, a voltage of a point a remains unchanged, the driving transistor T0 is in a saturation state, a voltage of one end of the driving transistor T0 is the power voltage vdd. the light emitting diode L ED is turned on, and a driving current thereof flows through the driving transistor T0 and the fourth switching transistor T4. according to a transistor saturation current calculation formula:
obtaining the driving current as follows:
where μ is the mobility of the driving transistor T0, CoxThe gate dielectric capacitance per unit area of the driving transistor T0,
is the channel width-to-length ratio of the driving transistor T0.
As can be seen from the expression of the driving current, the driving current is independent of the power supply voltage VDD and the threshold voltage Vth1 of the driving transistor T0, i.e., the shift of the threshold voltage of the driving transistor T0 and the decrease of the power supply voltage VDD do not affect the driving current. Therefore, the pixel circuit provided by the embodiment of the invention can compensate the threshold voltage of the driving transistor and the power supply voltage VDD, and the stability and uniformity of light emission of the display panel are improved.
It should be noted that, when the pixel circuit of the embodiment of the invention is applied to the simultaneous light-emitting driving mode, the first control signal S1 and the second control signal S2 may be two independent signals or may be a multiplexed row scanning signal.
When the first control signal S1 and the second control signal S2 are two independent signals, the second control signal S2 is a row scan signal, the first control signal S1, the third control signal S3 and the fourth control signal S4 are additional signals, and the first control signal S1 is simultaneously input to the pixel circuits of each row to perform centralized compensation on all the pixel circuits. The fourth control signal S4 is simultaneously input to each row of pixel circuits to control all the pixel circuits to emit light simultaneously.
When the first control signal S1 and the second control signal S2 are multiplexed row scanning signals, the first control signal S1 is input to each row of pixel circuits row by row, and the compensation is performed on each row of pixel circuits row by row, so that only the third control signal S3 and the fourth control signal S4 need to be additionally added. The third control signal S3 can be implemented by a simple GOA circuit, and the fourth control signal S4 is a global control signal, i.e., the fourth control signal S4 is input to each row of pixel circuits at the same time, which can be directly given by the IC, so that only two GOAs are needed for the whole panel, and the row scanning GOA and the GOA generating the third control signal S3 are needed, thereby easily implementing high resolution narrow frame applications.
In the pixel circuit provided by the embodiment of the invention, since the data signal VDATA is stored in the energy storage unit 31 after being input, the possibility of electric leakage is greatly reduced, so that the data signal VDATA can be kept for a long time until all pixel data are input, and the pixel circuit provided by the embodiment of the invention can be applied to a simultaneous light-emitting driving mode. In addition, the pixel circuit provided by the embodiment of the invention has simple control signals and small unit pixel area, and meets the requirements of strong compatibility and high resolution and narrow frame.
The pixel circuit of the embodiment of the invention can be applied to a simultaneous light-emitting driving mode and a traditional line-by-line light-emitting driving mode. Fig. 9 is a timing diagram of control signals applied to the progressive light emission driving mode by the pixel circuit according to the embodiment of the present invention, and the following describes an operation principle of the pixel circuit according to the embodiment of the present invention applied to the progressive light emission driving mode with reference to fig. 3 and 9:
in a voltage compensation phase T5, the first switch transistor T1 and the third switch transistor T3 are controlled to be turned on by the first control signal S1, the second switch transistor T2 is controlled to be turned off by the second control signal S2, the fifth switch transistor T5 is controlled to be turned on by the third control signal S3, and the fourth switch transistor T4 is controlled to be turned off by the fourth control signal S4.
In a data input stage T6 after the voltage compensation stage T5, the first switch transistor T1 and the third switch transistor T3 are controlled to be turned off by the first control signal S1, the second switch transistor T2 is controlled to be turned on by the second control signal S2, the fifth switch transistor T5 is controlled to be turned on by the third control signal S3, and the fourth switch transistor T4 is controlled to be turned off by the fourth control signal S4.
In a lighting period T7 after the data input period T6, the first switch transistor T1 and the third switch transistor T3 are turned off by the first control signal S1, the second switch transistor T2 is turned off by the second control signal S2, the fifth switch transistor T5 is turned off by the third control signal S3, and the fourth switch transistor T4 is turned on by the fourth control signal S4.
When the pixel circuit of the embodiment of the present invention is applied to the progressive light emission driving mode, the first control signal S1 and the second control signal S2 are multiplexed line scanning signals. The fourth control signal S4 is a line-by-line light emission control signal, and is input to each line of pixel circuits line by line to control each line of pixel circuits to emit light line by line.
Based on the same inventive concept, the embodiment of the invention also provides a driving method of the pixel circuit. The pixel circuit is the pixel circuit with the voltage compensation function described in the foregoing embodiment, and the driving method of the pixel circuit includes:
in a voltage compensation stage, the first switching tube and the third switching tube are controlled to be switched on by the first control signal, the second switching tube is controlled to be switched off by the second control signal, the fifth switching tube is controlled to be switched on by the third control signal, and the fourth switching tube is controlled to be switched off by the fourth control signal;
in a data input stage after the voltage compensation stage, the first switching tube and the third switching tube are controlled to be cut off by the first control signal, the second switching tube is controlled to be switched on by the second control signal, the fifth switching tube is controlled to be switched on by the third control signal, and the fourth switching tube is controlled to be cut off by the fourth control signal;
in a data holding stage after the data input stage, the first switching tube and the third switching tube are controlled to be cut off by the first control signal, the second switching tube is controlled to be cut off by the second control signal, the fifth switching tube is controlled to be cut off by the third control signal, and the fourth switching tube is controlled to be cut off by the fourth control signal;
in a light emitting stage after the data holding stage, the first switching tube and the third switching tube are controlled to be turned off by the first control signal, the second switching tube is controlled to be turned off by the second control signal, the fifth switching tube is controlled to be turned off by the third control signal, and the fourth switching tube is controlled to be turned on by the fourth control signal.
For a specific principle of the driving method, reference may be made to the foregoing description of the working principle of the pixel circuit applied to the simultaneous light-emitting driving mode, and details are not repeated here.
Based on the same inventive concept, the embodiment of the invention also provides another driving method of the pixel circuit. The pixel circuit is the pixel circuit with the voltage compensation function described in the foregoing embodiment, and the driving method of the pixel circuit includes:
in a voltage compensation stage, the first switching tube and the third switching tube are controlled to be switched on by the first control signal, the second switching tube is controlled to be switched off by the second control signal, the fifth switching tube is controlled to be switched on by the third control signal, and the fourth switching tube is controlled to be switched off by the fourth control signal;
in a data input stage after the voltage compensation stage, the first switching tube and the third switching tube are controlled to be cut off by the first control signal, the second switching tube is controlled to be switched on by the second control signal, the fifth switching tube is controlled to be switched on by the third control signal, and the fourth switching tube is controlled to be cut off by the fourth control signal;
in a light emitting stage after the data input stage, the first switching tube and the third switching tube are controlled to be turned off by the first control signal, the second switching tube is controlled to be turned off by the second control signal, the fifth switching tube is controlled to be turned off by the third control signal, and the fourth switching tube is controlled to be turned on by the fourth control signal.
For a specific principle of the driving method, reference may be made to the foregoing description of the operating principle of the pixel circuit applied to the progressive light emitting driving mode, and details are not repeated here.
Based on the same inventive concept, the embodiment of the invention also provides a display panel. The display panel includes a pixel array, where the pixel array includes a plurality of pixel circuits arranged in an array, and the pixel circuits are the pixel circuits with voltage compensation function described in the foregoing embodiments.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A pixel circuit with a voltage compensation function is characterized by comprising a driving transistor, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, an energy storage unit, a coupling unit and a light emitting diode;
one end of the driving transistor is used for receiving power supply voltage, a control end of the driving transistor is connected with the energy storage unit, the other end of the fifth switching tube and one end of the third switching tube, and the other end of the driving transistor is connected with the other end of the third switching tube and one end of the fourth switching tube;
one end of the second switch tube is used for receiving a data signal, and the other end of the second switch tube is connected with one end of the coupling unit and one end of the first switch tube;
the other end of the coupling unit is connected with one end of the fifth switching tube;
the other end of the fourth switching tube is connected with the anode of the light-emitting diode;
the cathode of the light emitting diode is grounded with the other end of the first switch tube;
the control end of the first switch tube and the control end of the third switch tube are used for receiving a first control signal, the control end of the second switch tube is used for receiving a second control signal, the control end of the fifth switch tube is used for receiving a third control signal, and the control end of the fourth switch tube is used for receiving a fourth control signal.
2. The pixel circuit with voltage compensation function according to claim 1, wherein the light emitting diode is Mini-L ED, Micro-L ED or O L ED.
3. The pixel circuit with voltage compensation function according to claim 1, wherein the energy storage unit includes a first capacitor;
one end of the first capacitor is connected with the control end of the driving transistor, the other end of the fifth switching tube and one end of the third switching tube, and the other end of the first capacitor is used for receiving the power supply voltage.
4. The pixel circuit with voltage compensation function according to claim 1, wherein the energy storage unit includes a first capacitor;
one end of the first capacitor is connected with the control end of the driving transistor, the other end of the fifth switching tube and one end of the third switching tube, and the other end of the first capacitor is grounded.
5. The pixel circuit having a voltage compensation function according to claim 1, wherein the coupling unit includes a second capacitor;
one end of the second capacitor is used as one end of the coupling unit, and the other end of the second capacitor is used as the other end of the coupling unit.
6. The pixel circuit with voltage compensation function according to claim 1, wherein the driving transistor, the first switching transistor, the second switching transistor, the third switching transistor, the fourth switching transistor and the fifth switching transistor are P-type thin film transistors;
one end of the driving transistor, one end of the first switch tube, one end of the second switch tube, one end of the third switch tube, one end of the fourth switch tube and one end of the fifth switch tube are source electrodes of the P-type thin film transistor, the other end of the driving transistor, the other end of the first switch tube, the other end of the second switch tube, the other end of the third switch tube, the other end of the fourth switch tube and the other end of the fifth switch tube are drain electrodes of the P-type thin film transistor, the control end of the driving transistor, the control end of the first switch tube, the control end of the second switch tube, the control end of the third switch tube, the control end of the fourth switch tube and the control end of the fifth switch tube are grids of the P-type thin film transistor.
7. A method of driving a pixel circuit according to any one of claims 1 to 6, comprising:
in a voltage compensation stage, the first switching tube and the third switching tube are controlled to be switched on by the first control signal, the second switching tube is controlled to be switched off by the second control signal, the fifth switching tube is controlled to be switched on by the third control signal, and the fourth switching tube is controlled to be switched off by the fourth control signal;
in a data input stage after the voltage compensation stage, the first switching tube and the third switching tube are controlled to be cut off by the first control signal, the second switching tube is controlled to be switched on by the second control signal, the fifth switching tube is controlled to be switched on by the third control signal, and the fourth switching tube is controlled to be cut off by the fourth control signal;
in a data holding stage after the data input stage, the first switching tube and the third switching tube are controlled to be cut off by the first control signal, the second switching tube is controlled to be cut off by the second control signal, the fifth switching tube is controlled to be cut off by the third control signal, and the fourth switching tube is controlled to be cut off by the fourth control signal;
in a light emitting stage after the data holding stage, the first switching tube and the third switching tube are controlled to be turned off by the first control signal, the second switching tube is controlled to be turned off by the second control signal, the fifth switching tube is controlled to be turned off by the third control signal, and the fourth switching tube is controlled to be turned on by the fourth control signal.
8. The method for driving the pixel circuit according to claim 7, wherein the first control signal and the second control signal are row scanning signals.
9. A method of driving a pixel circuit according to any one of claims 1 to 6, comprising:
in a voltage compensation stage, the first switching tube and the third switching tube are controlled to be switched on by the first control signal, the second switching tube is controlled to be switched off by the second control signal, the fifth switching tube is controlled to be switched on by the third control signal, and the fourth switching tube is controlled to be switched off by the fourth control signal;
in a data input stage after the voltage compensation stage, the first switching tube and the third switching tube are controlled to be cut off by the first control signal, the second switching tube is controlled to be switched on by the second control signal, the fifth switching tube is controlled to be switched on by the third control signal, and the fourth switching tube is controlled to be cut off by the fourth control signal;
in a light emitting stage after the data input stage, the first switching tube and the third switching tube are controlled to be turned off by the first control signal, the second switching tube is controlled to be turned off by the second control signal, the fifth switching tube is controlled to be turned off by the third control signal, and the fourth switching tube is controlled to be turned on by the fourth control signal.
10. A display panel comprising a pixel array, wherein the pixel array comprises a plurality of pixel circuits arranged in an array, and the pixel circuit is according to any one of claims 1 to 6.
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Application publication date: 20200804 |