CN110930947A - Pixel compensation circuit, driving method thereof and display device - Google Patents
Pixel compensation circuit, driving method thereof and display device Download PDFInfo
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- CN110930947A CN110930947A CN201911187560.1A CN201911187560A CN110930947A CN 110930947 A CN110930947 A CN 110930947A CN 201911187560 A CN201911187560 A CN 201911187560A CN 110930947 A CN110930947 A CN 110930947A
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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
Abstract
The invention discloses a pixel compensation circuit, a driving method thereof and a display device, wherein the pixel compensation circuit comprises: the switching tubes are used for controlling the on and off states of each switching tube through scanning signal lines and control signal lines; a light emitting element for providing a light source; the driving tube is electrically connected with the light-emitting element and is used for controlling the light-emitting intensity of the light-emitting element; and the storage capacitor is electrically connected with the driving tube and is used for providing bias voltage for the driving tube. The current flowing through the light emitting diode in the light emitting stage and the light emitting current of the pixel circuit are independent of the threshold voltage of the driving tube and the anode voltage of the light emitting diode, so that the drift of the threshold voltage of the driving tube and the aging of the light emitting diode can be compensated, and the drift of the carrier mobility mu of the driving tube can be restrained to a certain extent.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel compensation circuit, a driving method thereof and a display device.
Background
An Active Matrix Organic Light Emitting Diode (AMOLED) display based on a Thin Film Transistor (TFT) has the advantages of bright color, high contrast, wide viewing angle, high response speed, low power consumption and the like, and the AMOLED display technology is expected to replace liquid crystal display to become the mainstream display technology of the next generation.
Because of the organic light-Emitting diode display panel (organic light-Emitting diode)e, OLED) is a current mode device and therefore has high requirements on the stability and uniformity of the backplane technology. Currently, backplane technologies available for AMOLED mainly include polysilicon and metal oxide thin film transistors. Since these thin film transistors will have a threshold voltage (V)th) Non-uniformity or drift, and aging of the OLED itself.
Therefore, it is highly desirable to introduce an appropriate compensation mechanism to achieve high quality display.
Disclosure of Invention
In order to solve the above problem, embodiments of the present invention provide a pixel compensation circuit, a driving method thereof, and a display device, which can effectively solve the existing threshold voltage (V)th) Non-uniformity or drift, and aging of the OLED itself.
According to an aspect of the present invention, an embodiment of the present invention provides a pixel compensation circuit, including: the switching tubes are used for controlling the on and off states of each switching tube through scanning signal lines and control signal lines; a light emitting element for providing a light source; the driving tube is electrically connected with the light-emitting element and is used for controlling the light-emitting intensity of the light-emitting element; and the storage capacitor is electrically connected with the driving tube and is used for providing bias voltage for the driving tube.
Further, the plurality of switching tubes include: the first end of the first switch tube is electrically connected with a power line, and the control end of the first switch tube is electrically connected with the control signal line; a second switch tube, a first end of the second switch tube is electrically connected with a first end of the storage capacitor, and a control end of the second switch tube is electrically connected with the scanning signal line; the first end of the third switch tube is electrically connected with a current source, and the control end of the third switch tube is electrically connected with the scanning signal line; a fourth switching tube, a first end of the fourth switching tube is electrically connected with the data voltage line, and a control end of the fourth switching tube is electrically connected with the scanning signal line; a fifth switching tube, a first end of the fifth switching tube is electrically connected with the reference voltage line, and a control end of the fifth switching tube is electrically connected with the scanning signal line; a sixth switching tube, a first end of the sixth switching tube is electrically connected to the second end of the storage capacitor, and a control end of the sixth switching tube is electrically connected to the control signal line; and a seventh switching tube, wherein a first end of the seventh switching tube is electrically connected with a second end of the driving tube, and a control end of the seventh switching tube is electrically connected with the control signal line.
Further, the driving tube, the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube and the seventh switch tube are all thin film field effect transistors.
Further, the driving tube, the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube and the seventh switch tube are all N-type thin film field effect transistors.
Further, the light emitting element is a light emitting diode.
According to another aspect of the present invention, an embodiment of the present invention provides a display device, including the pixel compensation circuit.
According to another aspect of the present invention, an embodiment of the present invention provides a driving method of a pixel compensation circuit, including the following steps: in the first stage, the first switch tube, the sixth switch tube and the seventh switch tube are closed, and the second switch tube, the third switch tube, the fourth switch tube and the fifth switch tube are conducted; and the second stage is to close the second switch tube, the third switch tube, the fourth switch tube and the fifth switch tube and to conduct the first switch tube, the sixth switch tube, the seventh switch tube and the driving tube.
In a first stage, in the step of turning off the first switch tube, the sixth switch tube and the seventh switch tube and turning on the second switch tube, the third switch tube, the fourth switch tube and the fifth switch tube, the scan signal is at a high level and the control signal is at a low level.
Further, in the second stage, in the step of turning off the second switching tube, the third switching tube, the fourth switching tube and the fifth switching tube and turning on the first switching tube, the sixth switching tube and the seventh switching tube, the scan signal is at a low level and the control signal is at a high level.
The pixel compensation circuit has the advantages that the current flowing through the light emitting diode in the light emitting stage (namely the second stage) is independent of the light emitting current of the pixel circuit, the threshold voltage of the driving tube and the anode voltage of the light emitting diode, so that the drift of the threshold voltage of the driving tube and the aging of the light emitting diode can be compensated, and the drift of the carrier mobility mu of the driving tube can be restrained to a certain extent. Therefore, the pixel compensation circuit has high programming speed and high compensation precision.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a pixel compensation circuit according to an embodiment of the present invention.
Fig. 2 is a flowchart illustrating a driving method of a pixel compensation circuit according to an embodiment of the invention.
Fig. 3 is a timing diagram of control signal lines and scan signal lines according to an embodiment of the invention.
Fig. 4 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby features defined as "first", "second" may explicitly or implicitly include one or more of those features, in the description of the invention "plurality" means two or more unless explicitly defined otherwise.
As shown in fig. 1, a pixel compensation circuit provided for an embodiment of the present invention includes: a plurality of switch tubes, a light-emitting element, a storage capacitor and a current source.
The plurality of switching tubes control the on and off states of each switching tube through a scanning signal line and a control signal line. The light emitting element is used for providing a light source. The driving tube is electrically connected with the light-emitting element and is used for controlling the light-emitting intensity of the light-emitting element. The storage capacitor is electrically connected with the driving tube and used for providing bias voltage for the driving tube.
Specifically, the plurality of switching tubes include: a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube and a seventh switch tube.
Each of the switching tubes includes: a first terminal, a second terminal and a control terminal.
The first end of the first switch tube is electrically connected with a power line, and the control end of the first switch tube is electrically connected with the control signal line.
The first end of the second switch tube is electrically connected with the first end of the storage capacitor, and the control end of the second switch tube is electrically connected with the scanning signal line.
The first end of the third switch tube is electrically connected with a current source, and the control end of the third switch tube is electrically connected with the scanning signal line.
The first end of the fourth switch tube is electrically connected with a data voltage line, and the control end of the fourth switch tube is electrically connected with the scanning signal line.
The first end of the fifth switch tube is electrically connected with a reference voltage line, and the control end of the fifth switch tube is electrically connected with the scanning signal line.
The first end of the sixth switching tube is electrically connected with the second end of the storage capacitor, and the control end of the sixth switching tube is electrically connected with the control signal line.
The first end of the seventh switch tube is electrically connected with the second end of the driving tube, and the control end of the seventh switch tube is electrically connected with the control signal line.
The first end of the storage capacitor is electrically connected with the control end of the driving tube; and the anode of the light-emitting element is electrically connected with the second end of the seventh switching tube.
In this embodiment, the light emitting element is a light emitting diode. In other embodiments, other light emitting devices may be used.
The driving tube, the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube and the seventh switch tube are all thin film field effect transistors.
In one embodiment, the thin film transistor is an N-type thin film transistor, but is not limited thereto, and may also be a P-type thin film transistor, for example.
As shown in fig. 2, an embodiment of the present invention further provides a driving method of a pixel compensation circuit, including the following steps:
see also figure 3.
Step S210: in the first stage, the first switch tube, the sixth switch tube and the seventh switch tube are closed, and the second switch tube, the third switch tube, the fourth switch tube and the fifth switch tube are conducted.
In the first phase (programming phase), the control signal line EM is at a low level, and the first switch transistor T1, the sixth switch transistor T6 and the seventh switch transistor T7 are turned off. The SCAN signal line SCAN is at a high level, and the second switch transistor T2, the third switch transistor T3, the fourth switch transistor T4, and the fifth switch transistor T5 are turned on. One end of the first switch tube T1 and the power supply VDDConnection, VREFWriting into node A through a fifth switch tube T5, wherein V isA＝VREF，VDATAWriting into node S through the fourth switch tube T4, VS＝VDATA(ii) a Current source IbiasThe grid G node of the driving tube T8 is charged through the third switching tube T3 and the second switching tube T2 until the grid voltage of the driving tube T8 is greater than the threshold voltage V of the driving tube T8THAnd the driving tube T8 is operated after saturation, the bias current IbiasAll the current flows to the fourth switching tube T4 through the driving tube T8, and the expression of the current flowing through the driving tube T8 is
Where μ is the mobility of the carriers of the thin film transistor, CoxThe capacitance of the gate oxide layer per unit area of the driving tube T8, W and L are the width and length of the driving tube T8, IbiasFor bias current, converted to obtain
Obtaining the grid voltage of the driving tube
Thereby completing the threshold voltage V in the first stageTHIs extracted and the data voltage VDATAAt the time of power storageContainer CSAt a voltage value of
Step S220: and in the second stage, the second switching tube, the third switching tube, the fourth switching tube and the fifth switching tube are closed, and the first switching tube, the sixth switching tube and the seventh switching tube are conducted.
In the second stage, the SCAN signal line SCAN is at a low level, the second switch transistor T2, the third switch transistor T3, the fourth switch transistor T4 and the fifth switch transistor T5 are turned off, the control signal line EM is at a high level, the first switch transistor T1, the sixth switch transistor T6, the seventh switch transistor T7 and the driving transistor T8 are turned on, wherein one end of the first switch transistor T1 is connected to the power source V8DDWhen the voltage of the node S and the node A is equal to the anode voltage of the LED, i.e. VA＝VS＝VOLEDAt this time, the voltage at the node G will be bootstrapped to VG，，
Where μ is the mobility of the carriers of the thin film transistor, CoxW and L are the width and length of the driving transistor T8, respectively, for the gate oxide capacitance per unit area of the driving transistor T8, so that the current (I) of the LED during the second phase (i.e., the light emitting phase)OLED) Is expressed as
Further transformation can obtain
It can be seen from the formula that the current flowing through the light emitting diode in the light emitting stage (i.e. the second stage) is independent of the threshold voltage of the driving tube and the anode voltage of the light emitting diode, so that the drift of the threshold voltage of the driving tube and the aging of the light emitting diode can be compensated, and the light emitting diode can be prevented from being agedThe drift of the carrier mobility mu of the driving tube can be restrained to a certain extent.
As shown in fig. 4, a display device 20 according to an embodiment of the present invention includes a plurality of pixel compensation circuits 10 according to any of the embodiments. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.
Claims (10)
1. A pixel compensation circuit, comprising:
the switching tubes are used for controlling the on and off states of each switching tube through scanning signal lines and control signal lines;
a light emitting element for providing a light source;
the driving tube is electrically connected with the light-emitting element and is used for controlling the light-emitting intensity of the light-emitting element; and
and the storage capacitor is electrically connected with the driving tube and is used for providing bias voltage for the driving tube.
2. The pixel compensation circuit of claim 1, wherein the plurality of switching tubes comprises:
the first end of the first switch tube is electrically connected with a power line, and the control end of the first switch tube is electrically connected with the control signal line;
a second switch tube, a first end of the second switch tube is electrically connected with a first end of the storage capacitor, and a control end of the second switch tube is electrically connected with the scanning signal line;
the first end of the third switch tube is electrically connected with a current source, and the control end of the third switch tube is electrically connected with the scanning signal line;
a fourth switching tube, a first end of the fourth switching tube is electrically connected with the data voltage line, and a control end of the fourth switching tube is electrically connected with the scanning signal line;
a fifth switching tube, a first end of the fifth switching tube is electrically connected with the reference voltage line, and a control end of the fifth switching tube is electrically connected with the scanning signal line;
a sixth switching tube, a first end of the sixth switching tube is electrically connected to the second end of the storage capacitor, and a control end of the sixth switching tube is electrically connected to the control signal line; and
and the first end of the seventh switching tube is electrically connected with the second end of the driving tube, and the control end of the seventh switching tube is electrically connected with the control signal line.
3. The pixel compensation circuit of claim 2, wherein the driving transistor, the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor, the sixth switch transistor, and the seventh switch transistor are all thin film field effect transistors.
4. The pixel compensation circuit of claim 2, wherein the driving transistor, the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor, the sixth switch transistor and the seventh switch transistor are all N-type thin film transistors.
5. The pixel compensation circuit of claim 2, wherein the first terminal of the storage capacitor is electrically connected to the control terminal of the driving transistor; and the anode of the light-emitting element is electrically connected with the second end of the seventh switching tube.
6. The pixel compensation circuit of claim 1, wherein the light emitting element is a light emitting diode.
7. A display device comprising the pixel compensation circuit according to any one of claims 1 to 6.
8. A driving method of the pixel compensation circuit according to claim 1, comprising the steps of:
in the first stage, the first switch tube, the sixth switch tube and the seventh switch tube are closed, and the second switch tube, the third switch tube, the fourth switch tube and the fifth switch tube are conducted; and
and in the second stage, the second switching tube, the third switching tube, the fourth switching tube and the fifth switching tube are closed, and the first switching tube, the sixth switching tube, the seventh switching tube and the driving tube are conducted.
9. The method as claimed in claim 8, wherein in the step of turning off the first switch, the sixth switch and the seventh switch and turning on the second switch, the third switch, the fourth switch and the fifth switch, the scan signal is at a high level and the control signal is at a low level.
10. The method according to claim 8, wherein in the step of turning off the second, third, fourth and fifth switching transistors and turning on the first, sixth and seventh switching transistors, the scan signal is at a low level and the control signal is at a high level.
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| CN201911187560.1A CN110930947A (en) | 2019-11-28 | 2019-11-28 | Pixel compensation circuit, driving method thereof and display device |
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| CN201911187560.1A CN110930947A (en) | 2019-11-28 | 2019-11-28 | Pixel compensation circuit, driving method thereof and display device |
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| CN1388951A (en) * | 2000-07-07 | 2003-01-01 | 精工爱普生株式会社 | Current sampling circuit for organic electroluminescent display |
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