CN107464526B - 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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- CN107464526B CN107464526B CN201710898849.9A CN201710898849A CN107464526B CN 107464526 B CN107464526 B CN 107464526B CN 201710898849 A CN201710898849 A CN 201710898849A CN 107464526 B CN107464526 B CN 107464526B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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Abstract
The invention discloses a pixel compensation circuit, a driving method thereof and a display device, comprising: the device comprises a reset module, an initialization module, a data writing module, a compensation module, a light emitting control module, a driving module and a light emitting device; the compensation module is used for compensating the threshold voltage of the driving module, so that when the driving module drives the light-emitting device to emit light after compensating the threshold voltage, the working current provided for the light-emitting device is not influenced by the threshold voltage of the driving module any more.
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
Organic Light Emitting Diode (OLED) is one of the hot spots in the research field of flat panel displays, and compared with Liquid Crystal Displays (LCD), OLED displays have the advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle, and fast response speed. The design of the pixel compensation circuit for controlling the light emission of the light emitting device is the core technical content of the OLED display, and has important research significance.
In the existing pixel compensation circuit, when the driving transistor drives the light emitting device to emit light, the light emitting brightness of the light emitting device is quite sensitive to the change of the driving current of the light emitting device, the driving transistors cannot be completely consistent in the manufacturing process, and due to the process deviation, the temperature change in the working process and other reasons, the threshold voltage of the driving transistor in each pixel compensation circuit is non-uniform, so that the current flowing through the light emitting device in each pixel point is changed, the display brightness is not uniform, and the display effect of the whole image is influenced.
Disclosure of Invention
Embodiments of the present invention provide a pixel compensation circuit, a driving method thereof and a display device, so as to improve the influence of the variation of the threshold voltage of the driving transistor on the light emitting brightness of the light emitting device in the prior art.
Therefore, an embodiment of the present invention provides a pixel compensation circuit, including: the device comprises a reset module, an initialization module, a data writing module, a compensation module, a light emitting control module, a driving module and a light emitting device;
the control end of the reset module is connected with the reset signal end, the input end of the reset module is connected with the first power supply end, and the output end of the reset module is connected with the first node; the reset module is used for providing the signal of the first power supply end to the first node under the control of the reset signal end;
the control end of the initialization module is connected with the first scanning signal end, the input end of the initialization module is connected with the initialization signal end, and the output end of the initialization module is connected with the second node; the initialization module is used for providing a signal of the initialization signal terminal to the second node under the control of the first scanning signal terminal;
the control end of the data writing module is connected with the second scanning signal end, the input end of the data writing module is connected with the data signal end, and the output end of the data writing module is connected with the first node; the data writing module is used for providing the signal of the data signal end to the first node under the control of the second scanning signal end;
the first end of the compensation module is connected with the first node, the second end of the compensation module is connected with the third node, and the third end of the compensation module is connected with the initialization signal end; the compensation module is used for providing the threshold voltage of the driving module to the third node;
the control end of the light-emitting control module is connected with a light-emitting control signal end, the input end of the light-emitting control module is connected with the first power supply end, and the output end of the light-emitting control module is connected with the third node; the control end of the driving module is connected with the first node, the input end of the driving module is connected with the third node, and the output end of the driving module is connected with the second node; one end of the light-emitting device is connected with the second node, and the other end of the light-emitting device is connected with a second power supply end; the light-emitting control module is used for enabling the driving module to drive the light-emitting device to emit light under the control of the light-emitting control signal end.
In a possible implementation manner, in the pixel compensation circuit provided in an embodiment of the present invention, the reset module includes: a first switching transistor;
the gate of the first switching transistor is connected to the reset signal terminal, the source is connected to the first power terminal, and the drain is connected to the first node.
In a possible implementation manner, in the pixel compensation circuit provided in an embodiment of the present invention, the initialization module includes: a second switching transistor;
and the grid electrode of the second switch transistor is connected with the first scanning signal end, the source electrode of the second switch transistor is connected with the initialization signal end, and the drain electrode of the second switch transistor is connected with the second node.
In a possible implementation manner, in the pixel compensation circuit provided in an embodiment of the present invention, the data writing module includes: a third switching transistor;
and the grid electrode of the third switching transistor is connected with the first scanning signal end, the source electrode of the third switching transistor is connected with the data signal end, and the drain electrode of the third switching transistor is connected with the first node.
In a possible implementation manner, in the pixel compensation circuit provided in an embodiment of the present invention, the compensation module includes: a first capacitor and a second capacitor;
one end of the first capacitor is connected with the first node, and the other end of the first capacitor is connected with the third node;
one end of the second capacitor is connected with the third node, and the other end of the second capacitor is connected with the initialization signal end.
In a possible implementation manner, in the pixel compensation circuit provided in an embodiment of the present invention, the light emission control module includes: a fourth switching transistor;
and the grid electrode of the fourth switching transistor is connected with the light-emitting control signal end, the source electrode of the fourth switching transistor is connected with the first power supply end, and the drain electrode of the fourth switching transistor is connected with the third node.
In a possible implementation manner, in the pixel compensation circuit provided in an embodiment of the present invention, the driving module includes: a drive transistor;
and the grid electrode of the driving transistor is connected with the first node, the source electrode of the driving transistor is connected with the third node, and the drain electrode of the driving transistor is connected with the second node.
In a possible implementation manner, in the pixel compensation circuit provided in the embodiment of the present invention, the first switching transistor, the second switching transistor, the third switching transistor, and the fourth switching transistor, and the driving transistor are all P-type transistors or N-type transistors.
The embodiment of the invention provides a display device which comprises the pixel compensation circuit.
The embodiment of the invention also provides a driving method of the pixel compensation circuit, which comprises the following steps:
in the reset stage, the reset module outputs a signal of a first power supply end to a first node under the control of a reset signal end; the light-emitting control module outputs a signal of the first power supply end to the third node under the control of a light-emitting control signal end;
in the initialization stage, the initialization module outputs a signal of the initialization signal end to the second node under the control of the first scanning signal end; the reset module continues to output the signal of the first power supply end to the first node under the control of the reset signal end; the light-emitting control module continues to output the signal of the first power supply end to the third node under the control of the light-emitting control signal end;
in the compensation stage, a data writing module writes a reference signal into the first node under the control of a second scanning signal end; the compensation module compensates the threshold voltage of the input end of the driving module;
a data writing-in stage, wherein the data writing-in module writes a data signal into the first node under the control of the second scanning signal terminal;
in the light-emitting stage, the light-emitting control module outputs the signal of the first power supply end to the third node under the control of a light-emitting control signal end; the driving module conducts the second node and the third node under the control of the first node to drive the light-emitting device to emit light.
The invention has the following beneficial effects:
the embodiment of the invention provides a pixel compensation circuit, a driving method thereof and a display device, wherein the pixel compensation circuit comprises: the device comprises a reset module, an initialization module, a data writing module, a compensation module, a light emitting control module, a driving module and a light emitting device; the control end of the reset module is connected with the reset signal end, the input end of the reset module is connected with the first power supply end, and the output end of the reset module is connected with the first node; the reset module is used for providing a signal of a first power supply end to a first node under the control of a reset signal end; the control end of the initialization module is connected with the first scanning signal end, the input end of the initialization module is connected with the initialization signal end, and the output end of the initialization module is connected with the second node; the initialization module is used for providing a signal of the initialization signal end to the second node under the control of the first scanning signal end; the control end of the data writing module is connected with the second scanning signal end, the input end of the data writing module is connected with the data signal end, and the output end of the data writing module is connected with the first node; the data writing module is used for providing the signal of the data signal end to the first node under the control of the second scanning signal end; the first end of the compensation module is connected with the first node, the second end of the compensation module is connected with the third node, and the third end of the compensation module is connected with the initialization signal end; the compensation module is used for providing the threshold voltage of the driving module to the third node; the control end of the light-emitting control module is connected with the light-emitting control signal end, the input end of the light-emitting control module is connected with the first power supply end, and the output end of the light-emitting control module is connected with the third node; the control end of the driving module is connected with the first node, the input end of the driving module is connected with the third node, and the output end of the driving module is connected with the second node; one end of the light-emitting device is connected with the second node, and the other end of the light-emitting device is connected with a second power supply end; the light-emitting control module is used for enabling the driving module to drive the light-emitting device to emit light under the control of the light-emitting control signal end. The compensation module is used for compensating the threshold voltage of the driving module, so that when the driving module drives the light-emitting device to emit light after compensating the threshold voltage, the working current provided for the light-emitting device is not influenced by the threshold voltage of the driving module any more.
Drawings
Fig. 1a and fig. 1b are schematic structural diagrams of a pixel compensation circuit according to an embodiment of the invention;
fig. 2 is a flowchart of a driving method of a pixel compensation circuit according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a driving timing sequence of the pixel compensation circuit shown in FIG. 1 b;
fig. 4a to 4e show on or off state diagrams of the first switching transistor T1, the second switching transistor T2, the third switching transistor T3, the fourth switching transistor T4, and the driving transistor T5 at respective stages shown in fig. 3.
Detailed Description
The following describes in detail specific embodiments of a pixel compensation circuit, a driving method thereof, and a display device according to embodiments of the present invention with reference to the accompanying drawings. It should be noted that the embodiments described in this specification are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A pixel compensation circuit provided in an embodiment of the present invention, as shown in fig. 1a and fig. 1b, includes: a reset module 101, an initialization module 102, a data write module 103, a compensation module 104, a light emission control module 105, a driving module 106, and a light emitting device EL;
the control end of the reset module 101 is connected with a reset signal end RST, the input end is connected with a first power supply end VDD, and the output end is connected with a first node N1; the reset block 101 is configured to provide a signal of the first power terminal VDD to the first node N1 under the control of a reset signal terminal RST;
control terminal of initialization module 102 and first scan signal terminal GATEN+1The input end of the first node is connected with the initialization signal end VINIT, and the output end of the first node is connected with the second node N2; the initialization module 102 is used for gating a first scan signal terminalN+1Provides the signal of the initialization signal terminal VINIT to the second node N2;
a control terminal of the DATA writing module 103 is connected to the second scan signal terminal GATE, an input terminal thereof is connected to the DATA signal terminal DATA, and an output terminal thereof is connected to the first node N1; the DATA writing module 102 is configured to provide the signal of the DATA signal terminal DATA to the first node N1 under the control of the second scan signal terminal GATE;
the first end of the compensation module 104 is connected to the first node N1, the second end is connected to the third node N3, and the third end is connected to the initialization signal terminal VINIT; the compensation module 104 is used for adjusting the threshold voltage | V of the driving module 106th| is provided to the third node N3;
the control end of the light-emitting control module 105 is connected with the light-emitting control signal end EM, the input end is connected with the first power supply end VDD, and the output end is connected with the third node N3; the control terminal of the driving module 106 is connected to the first node N1, the input terminal thereof is connected to the third node N3, and the output terminal thereof is connected to the second node N2; one end of the light emitting device EL is connected to the second node N2, and the other end is connected to a second power source terminal VSS; the light emission control module 105 is configured to enable the driving module 106 to drive the light emitting device EL to emit light under the control of the light emission control signal terminal EM.
In the pixel compensation circuit provided by the embodiment of the invention, the threshold voltage | V is applied to the driving module 106 through the compensation module 104th| such that the driving module 106 is at the compensated threshold voltage | VthWhen the light emitting device EL is driven to emit light after | l, the operating current supplied to the light emitting device EL is not driven by the driving mode any moreThreshold voltage | V of block 106thI, therefore, the pixel compensation circuit provided in the embodiment of the present invention avoids the problem of different threshold voltages | VthThe problem of unstable current flowing through the light-emitting device EL caused by | improves the uniformity of the light-emitting device EL luminance, thereby ensuring the quality of the display picture.
In the pixel compensation circuit according to the embodiment of the present invention, the voltage of the signal of the first power source terminal VDD is generally a high voltage, and the voltage of the signal of the second power source terminal VSS is generally a low voltage or ground. In practical applications, the voltages of the signals of the first power source terminal VDD and the second power source terminal VSS need to be designed and determined according to practical application environments, which are not limited herein.
The present invention will be described in detail with reference to specific examples. It should be noted that the following specific examples are provided for better explaining the present invention, but not limiting the present invention.
In a specific implementation, in the pixel compensation circuit provided in the embodiment of the present invention, as shown in fig. 1b, the reset module 101 includes: a first switching transistor T1;
the first switching transistor T1 has a gate connected to a reset signal terminal RST, a source connected to a first power terminal VDD, and a drain connected to a first node N1.
Specifically, in the above-described pixel compensation circuit according to the embodiment of the present invention, when the first switching transistor T1 is in a turn-on state under the control of the reset signal terminal RST, the signal of the first power source terminal VDD is transmitted to the first node N1 through the turned-on first switching transistor T1 to reset the first node N1 through the first power source terminal VDD.
The above is merely an example of the specific structure of the reset module 101 in the pixel compensation circuit, and in the specific implementation, the specific structure of the reset module 101 is not limited to the above structure provided in the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
In a specific implementation, in the pixel compensation circuit provided in the embodiment of the present invention, as shown in fig. 1b, the initialization module 102 includes: a second switching transistor T2;
the GATE of the second switching transistor T2 and the first scan signal terminal GATEN+1To the initialization signal terminal VINIT, and to the second node N2.
Specifically, in the pixel compensation circuit provided by the embodiment of the invention, the second switching transistor T2 is at the first scan signal terminal GATEN+1When turned on, the signal of the initialization signal terminal VINIT is written into the second node N2 through the turned-on second switching transistor T2 to initialize the second node N2 through the initialization signal terminal VINIT.
The above is merely an example of the specific structure of the initialization module 102 in the pixel compensation circuit, and in the specific implementation, the specific structure of the initialization module 102 is not limited to the above structure provided in the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
In a specific implementation, as shown in fig. 1b, in the pixel compensation circuit provided in the embodiment of the present invention, the data writing module 103 includes: a third switching transistor T3;
the third switching transistor T3 has a GATE connected to the second scan signal terminal GATE, a source connected to the DATA signal terminal DATA, and a drain connected to the first node N1.
Specifically, in the pixel compensation circuit provided in the embodiment of the invention, when the third switching transistor T3 is turned on under the control of the second scan signal terminal GATE, the signal of the DATA signal terminal DATA is written into the first node N1 to control the control terminal of the driving module 106.
The above is only an example of the specific structure of the data writing module 103 in the pixel compensation circuit, and in the implementation, the specific structure of the data writing module 103 is not limited to the above structure provided in the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
In a specific implementation, in the pixel compensation circuit provided in the embodiment of the present invention, the compensation module 104 includes: 4a first capacitance C1 and a second capacitance C2;
one end of the first capacitor C1 is connected to the first node N1, and the other end is connected to the third node N3;
one end of the second capacitor C2 is connected to the third node N3, and the other end is connected to the initialization signal terminal VINIT.
Specifically, in the pixel compensation circuit provided in the embodiment of the invention, the third switching transistor T3 is turned on under the control of the second scan signal terminal GATE, and the reference signal V of the DATA signal terminal DATArefThe first node N1 is written. Due to the existence of the first capacitor C1 and the second capacitor C2, and the voltage transfer characteristics of the driving module 106, the potential of the second node N2 becomes Vref+|VthAnd thus threshold voltage compensation for the driving module 106 is achieved.
The above is merely an example of the specific structure of the compensation module 104 in the pixel compensation circuit, and in the specific implementation, the specific structure of the compensation module 104 is not limited to the above structure provided in the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
In practical implementation, in the pixel compensation circuit provided in the embodiment of the present invention, the light-emitting control module 105 includes a fourth switching transistor T4, and the driving module 106 includes a driving transistor T5;
a gate of the fourth switching transistor T4 is connected to the emission control signal terminal EM, a source thereof is connected to the first power terminal VDD, and a drain thereof is connected to the third node N3;
the driving transistor T5 has a gate connected to the first node N1, a source connected to the third node N3, and a drain connected to the second node N2.
Specifically, in the above pixel compensation circuit provided by the embodiment of the present invention, when the fourth switching transistor T4 is turned on under the control of the light emission control signal terminal EM and the driving transistor T5 is turned on under the control of the first node N1, the signal of the first power terminal VDD is written into the driving transistor T5 through the turned-on fourth transistor T4 and is converted into a current through the turned-on driving transistor T5 to be supplied to the light emitting device EL to drive the light emitting device EL to emit light.
The above is only an example of the specific structures of the light-emitting control module 105 and the driving module 106 in the pixel compensation circuit, and in the implementation, the specific structures of the light-emitting control module 105 and the driving module 106 are not limited to the structures provided in the embodiments of the present invention, and may be other structures known to those skilled in the art, and are not limited herein.
In practical implementation, in the pixel compensation circuit provided in the embodiment of the present invention, the light emitting device EL is generally an organic light emitting diode, and the light emitting device EL emits light under the action of the current when the driving transistor is in a saturation state. And the anode of the organic light emitting diode is connected to the second node N2 and the cathode is connected to the second power source terminal VSS.
It should be noted that, the sources and drains of the first switching transistor T1, the second switching transistor T2, the third switching transistor T3, the fourth switching transistor T4 and the driving transistor T5 mentioned in the above embodiments of the present invention may be interchanged according to the types of transistors and the input signals, and no specific distinction is made here.
Generally, when the first switching transistor T1, the second switching transistor T2, the third switching transistor T3, the fourth switching transistor T4 and the driving transistor T5 are all P-type transistors, the source is an input terminal and the drain is an output terminal; when the first switching transistor T1, the second switching transistor T2, the third switching transistor T3, the fourth switching transistor T4 and the driving transistor T5 are all N-type transistors, the drain is an input terminal and the source is an output terminal.
In the pixel compensation circuit according to the embodiment of the present invention, the first switching transistor T1, the second switching transistor T2, the third switching transistor T3, the fourth switching transistor T4 and the driving transistor T5 are all P-type transistors or all N-type transistors, which is not limited herein.
Preferably, in the pixel compensation circuit provided in the embodiment of the present invention, the first switching transistor T1, the second switching transistor T2, the third switching transistor T3, the fourth switching transistor T4, and the driving transistor T5 all adopt P-channel metal oxide semiconductor field effect transistors PMOS, so that the manufacturing process flow of the pixel compensation circuit can be simplified, and the resolution of the display panel can be improved.
Based on the same inventive concept, the embodiment of the invention also provides a driving method of the pixel compensation circuit. Since the principle of the driving method for solving the problem is similar to that of the pixel compensation circuit, the implementation of the driving method can be referred to the implementation of the pixel compensation circuit in the foregoing example, and repeated details are not repeated.
Specifically, an embodiment of the present invention provides a method for driving the pixel compensation circuit, as shown in fig. 2, including:
s201, in a reset stage, a reset module outputs a signal of a first power supply end to a first node under the control of a reset signal end; the light-emitting control module outputs a signal of the first power supply end to a third node under the control of the light-emitting control signal end;
s202, in an initialization stage, an initialization module outputs a signal of an initialization signal end to a second node under the control of a first scanning signal end; the reset module continues to output the signal of the first power supply end to the first node under the control of the reset signal end; the light-emitting control module continues to output the signal of the first power supply end to the third node under the control of the light-emitting control signal end;
s203, in the compensation stage, the data writing module writes the reference signal into the first node under the control of the second scanning signal end; the compensation module compensates the threshold voltage of the input end of the driving module;
s204, in a data writing stage, the data writing module writes the data signal into the first node under the control of the second scanning signal end;
s205, in a light-emitting stage, the light-emitting control module outputs a signal of the first power supply end to a third node under the control of a light-emitting control signal end; the driving module conducts the second node and the third node under the control of the first node, and drives the light-emitting device to emit light.
In order to better understand the technical solution of the present invention, the following description will be made by taking the structure of the pixel compensation circuit shown in fig. 1b as an example, wherein in the pixel compensation circuit shown in fig. 1b, the driving transistor and all the switching transistors are P-channel metal oxide semiconductor field effect transistors PMOS, and each PMOS transistor is turned on under the action of low level and turned off under the action of high level; the corresponding input timing diagram is shown in fig. 3, and specifically, the reset phase t1, the initialization phase t2, the compensation phase t3, the data writing phase t4, and the light emitting phase t5 in the driving timing diagram shown in fig. 3 are taken as examples for detailed description. Fig. 4a to 4e illustrate on or off states of the first switching transistor T1, the second switching transistor T2, the third switching transistor T3, the fourth switching transistor T4, and the driving transistor T5 at stages; where circles indicate that the transistors are in an on state and slashes indicate that the transistors are in an off state.
Reset phase t 1: reset signal terminal RST is at low potential, first scanning signal terminal GATEN+1The second scan signal terminal GATE is at a high potential, and the emission control terminal EM is at a low potential.
As shown in fig. 4a, the first switching transistor T1 and the fourth switching transistor T4 are in a turned-on state, and the second switching transistor T2, the third switching transistor T3 and the driving transistor T5 are in a turned-off state. The signal of the first power terminal VDD is transmitted to the first node N1 through the turned-on first switching transistor T1 to reset the first node N1 through the first power terminal VDD; the signal of the first power terminal VDD at this time is also transmitted to the third node N3 through the turned-on fourth switching transistor T4 to charge the third node N3 through the first power terminal VDD.
Initialization phase t 2: reset signal terminal RST is at low potential, first scanning signal terminal GATEN+1The second scan signal terminal GATE is at a low potential, the second scan signal terminal GATE is at a high potential, and the emission control terminal EM is at a low potential.
As shown in fig. 4b, the first, second, and fourth switching transistors T1, T2, and T4 are in a turned-on state, and the third and driving transistors T3 and T5 are in a turned-off state. The signal of the initialization signal terminal VINIT is written into the second node N2 through the turned-on second switching transistor T2 to initialize the second node N2; the signal of the first power terminal VDD is transmitted to the first node N1 through the turned-on first switching transistor T1 to continue to reset the first node N1 through the first power terminal VDD; the signal of the first power terminal VDD at this time is also transmitted to the third node N3 through the turned-on fourth switching transistor T4 to continue charging the third node N3 through the first power terminal VDD.
Compensation phase t 3: reset signal terminal RST is at high potential, first scanning signal terminal GATEN+1The second scan signal terminal GATE is at a low potential, and the emission control terminal EM is at a high potential.
As shown in fig. 4c, the first switching transistor T1 and the fourth switching transistor T4 are in an off state, and the second switching transistor T2, the third switching transistor T3 and the driving transistor T5 are in an on state. Reference signal V of low potential of DATA signal terminal DATArefWrite to the first node N1, and VrefGreater than | VthI, so that the driving transistor T5 is in a conducting state; the signal of the initialization signal terminal VINIT is written into the second node N2 through the turned-on second switching transistor T2; due to the presence of the first and second capacitors C1 and C2 and the voltage transfer characteristic of the driving transistor T5, the potential of the third node N3 becomes Vref+|VthI, thereby realizing a threshold voltage | V to the driving transistor T5thAnd (5) compensating for | in the method.
Data write phase t 4: reset signal terminal RST is at high potential, first scanning signal terminal GATEN+1The second scan signal terminal GATE is at a high potential, the second scan signal terminal GATE is at a low potential, and the emission control terminal EM is at a high potential.
As shown in fig. 4d, the first, second, and fourth switching transistors T1, T2, and T4 are in an off state, and the third and driving transistors T3 and T5 are in an on state. Low potential DATA signal V of DATA signal terminal DATAdataWriting into the first node N1, wherein the voltage difference between the second node N2 and the third node N3 is Vref+|Vth|+C1*(Vdata-Vref)/(C1+C2)。
Lighting phase t 5: reset signal terminal RST is at high potential, first scanning signal terminal GATEN+1The second scan signal terminal GATE is at a high potential, and the emission control terminal EM is at a low potential.
As shown in fig. 4e, a first switching transistor T1, a third switching transistor T3, and a second switching transistor T3The switching transistor T2 is in an off state, and the fourth switching transistor T4 and the driving transistor T5 are in an on state. When the fourth switching transistor T4 is turned on under the control of the light emission control signal terminal EM and the driving transistor T5 is turned on under the control of the first node N1, a signal of the first power source terminal VDD is written into the driving transistor T5 through the turned-on fourth transistor T4 and is converted into a current through the turned-on driving transistor T5 to be supplied to the light emitting device EL to drive the light emitting device EL to emit light. And the current for driving the light emitting device EL to emit light is the current I when the driving transistor T5 is in the saturation statedsThe method comprises the following steps:
Ids＝K(Vsg-|Vth|)2＝K[C1/(C1+C2)]2(Vref-Vdata)2
from the above formula, it can be seen that the driving transistor T5 drives the operating current I of the light emitting device EL to emit lightdsData signal V only with Data signal terminal DataDataAnd a reference signal VrefRelated to the threshold voltage | V of the driving transistor T5thL is irrelevant, so that the threshold voltage | V caused by the process of the driving transistor T5 and long-time operation can be solvedthThe influence of the | drift on the working current for driving the light emitting device EL, so that the working current of the light emitting device EL is kept stable, and the normal operation of the light emitting device EL is ensured.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, including the display panel provided in the embodiment of the present invention, where 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 panel, a notebook computer, a digital photo frame, a navigator, an intelligent watch, a fitness wrist strap, and a personal digital assistant. Other essential components of the display device should be understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present invention. The implementation of the display device can refer to the above embodiments of the pixel compensation circuit, and repeated descriptions are omitted.
The pixel compensation circuit, the driving method thereof and the display device provided by the embodiment of the invention comprise: the device comprises a reset module, an initialization module, a data writing module, a compensation module, a light emitting control module, a driving module and a light emitting device; the control end of the reset module is connected with the reset signal end, the input end of the reset module is connected with the first power supply end, and the output end of the reset module is connected with the first node; the reset module is used for providing a signal of a first power supply end to a first node under the control of a reset signal end; the control end of the initialization module is connected with the first scanning signal end, the input end of the initialization module is connected with the initialization signal end, and the output end of the initialization module is connected with the second node; the initialization module is used for providing a signal of the initialization signal end to the second node under the control of the first scanning signal end; the control end of the data writing module is connected with the second scanning signal end, the input end of the data writing module is connected with the data signal end, and the output end of the data writing module is connected with the first node; the data writing module is used for providing the signal of the data signal end to the first node under the control of the second scanning signal end; the first end of the compensation module is connected with the first node, the second end of the compensation module is connected with the third node, and the third end of the compensation module is connected with the initialization signal end; the compensation module is used for providing the threshold voltage of the driving module to the third node; the control end of the light-emitting control module is connected with the light-emitting control signal end, the input end of the light-emitting control module is connected with the first power supply end, and the output end of the light-emitting control module is connected with the third node; the control end of the driving module is connected with the first node, the input end of the driving module is connected with the third node, and the output end of the driving module is connected with the second node; one end of the light-emitting device is connected with the second node, and the other end of the light-emitting device is connected with a second power supply end; the light-emitting control module is used for enabling the driving module to drive the light-emitting device to emit light under the control of the light-emitting control signal end. The compensation module is used for compensating the threshold voltage of the driving module, so that when the driving module drives the light-emitting device to emit light after compensating the threshold voltage, the working current provided for the light-emitting device is not influenced by the threshold voltage of the driving module any more.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
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 (9)
1. A pixel compensation circuit, comprising: the device comprises a reset module, an initialization module, a data writing module, a compensation module, a light emitting control module, a driving module and a light emitting device;
the control end of the reset module is connected with the reset signal end, the input end of the reset module is connected with the first power supply end, and the output end of the reset module is connected with the first node; the reset module is used for providing the signal of the first power supply end to the first node under the control of the reset signal end;
the control end of the initialization module is connected with the first scanning signal end, the input end of the initialization module is connected with the initialization signal end, and the output end of the initialization module is connected with the second node; the initialization module is used for providing a signal of the initialization signal terminal to the second node under the control of the first scanning signal terminal;
the control end of the data writing module is connected with the second scanning signal end, the input end of the data writing module is connected with the data signal end, and the output end of the data writing module is connected with the first node; the data writing module is used for providing the signal of the data signal end to the first node under the control of the second scanning signal end;
the first end of the compensation module is connected with the first node, the second end of the compensation module is connected with the third node, and the third end of the compensation module is connected with the initialization signal end; the compensation module is used for providing the threshold voltage of the driving module to the third node;
the control end of the light-emitting control module is connected with a light-emitting control signal end, the input end of the light-emitting control module is connected with the first power supply end, and the output end of the light-emitting control module is connected with the third node; the control end of the driving module is connected with the first node, the input end of the driving module is connected with the third node, and the output end of the driving module is connected with the second node; one end of the light-emitting device is connected with the second node, and the other end of the light-emitting device is connected with a second power supply end; the light-emitting control module is used for enabling the driving module to drive the light-emitting device to emit light under the control of the light-emitting control signal end;
the driving module includes: a drive transistor;
the grid electrode of the driving transistor is connected with the first node, the source electrode of the driving transistor is connected with the third node, the drain electrode of the driving transistor is connected with the second node, and the driving transistor is an N-type transistor.
2. The pixel compensation circuit of claim 1, wherein the reset module comprises: a first switching transistor;
the gate of the first switching transistor is connected to the reset signal terminal, the source is connected to the first power terminal, and the drain is connected to the first node.
3. The pixel compensation circuit of claim 1, wherein the initialization module comprises: a second switching transistor;
and the grid electrode of the second switch transistor is connected with the first scanning signal end, the source electrode of the second switch transistor is connected with the initialization signal end, and the drain electrode of the second switch transistor is connected with the second node.
4. The pixel compensation circuit of claim 1, wherein the data write module comprises: a third switching transistor;
and the grid electrode of the third switching transistor is connected with the second scanning signal end, the source electrode of the third switching transistor is connected with the data signal end, and the drain electrode of the third switching transistor is connected with the first node.
5. The pixel compensation circuit of claim 1, wherein the compensation module comprises: a first capacitor and a second capacitor;
one end of the first capacitor is connected with the first node, and the other end of the first capacitor is connected with the third node;
one end of the second capacitor is connected with the third node, and the other end of the second capacitor is connected with the initialization signal end.
6. The pixel compensation circuit of claim 1, wherein the light emission control module comprises: a fourth switching transistor;
and the grid electrode of the fourth switching transistor is connected with the light-emitting control signal end, the source electrode of the fourth switching transistor is connected with the first power supply end, and the drain electrode of the fourth switching transistor is connected with the third node.
7. A pixel compensation circuit according to any of claims 2-6, wherein the first, second, third and fourth switching transistors are N-type transistors.
8. A display device, comprising: a pixel compensation circuit according to any one of claims 1-7.
9. A method of driving a pixel compensation circuit according to any one of claims 1 to 7, comprising:
in the reset stage, the reset module outputs a signal of a first power supply end to a first node under the control of a reset signal end; the light-emitting control module outputs a signal of the first power supply end to the third node under the control of a light-emitting control signal end;
in the initialization stage, the initialization module outputs a signal of the initialization signal end to the second node under the control of the first scanning signal end; the reset module continues to output the signal of the first power supply end to the first node under the control of the reset signal end; the light-emitting control module continues to output the signal of the first power supply end to the third node under the control of the light-emitting control signal end;
in the compensation stage, a data writing module writes a reference signal into the first node under the control of a second scanning signal end; the compensation module compensates the threshold voltage of the input end of the driving module;
a data writing-in stage, wherein the data writing-in module writes a data signal into the first node under the control of the second scanning signal terminal;
in the light-emitting stage, the light-emitting control module outputs the signal of the first power supply end to the third node under the control of a light-emitting control signal end; the driving module conducts the second node and the third node under the control of the first node to drive the light-emitting device to emit light.
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| CN109920373B (en) * | 2017-12-13 | 2021-05-18 | 京东方科技集团股份有限公司 | Circuit driving compensation method, circuit driving method and device and display device |
| CN109949739B (en) | 2017-12-20 | 2020-09-22 | 上海和辉光电股份有限公司 | Pixel circuit, driving method and display |
| CN108399888B (en) * | 2018-05-29 | 2020-03-20 | 京东方科技集团股份有限公司 | Pixel driving circuit, driving method thereof, pixel circuit and display panel |
| CN108470539B (en) | 2018-06-13 | 2020-04-21 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof, display panel and display device |
| CN109147673B (en) * | 2018-09-19 | 2020-08-14 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display device |
| CN109509433B (en) * | 2019-01-30 | 2021-01-26 | 京东方科技集团股份有限公司 | Pixel circuit, display device and pixel driving method |
| CN110070830B (en) * | 2019-04-19 | 2021-08-06 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit and display panel |
| CN109979384B (en) * | 2019-04-25 | 2021-05-04 | 京东方科技集团股份有限公司 | Pixel driving circuit, pixel circuit, display device and pixel driving method |
| CN112767881A (en) * | 2021-02-10 | 2021-05-07 | Tcl华星光电技术有限公司 | Pixel driving circuit and display panel |
| CN114038367A (en) * | 2021-08-26 | 2022-02-11 | 重庆康佳光电技术研究院有限公司 | Pixel driving circuit, method, driving substrate and display panel |
| CN114783376A (en) * | 2022-04-01 | 2022-07-22 | 深圳市华星光电半导体显示技术有限公司 | Display panel and display device |
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