CN108346400B - Pixel circuit, driving method and display panel - Google Patents
Pixel circuit, driving method and display panel Download PDFInfo
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- CN108346400B CN108346400B CN201810185347.6A CN201810185347A CN108346400B CN 108346400 B CN108346400 B CN 108346400B CN 201810185347 A CN201810185347 A CN 201810185347A CN 108346400 B CN108346400 B CN 108346400B
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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
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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
Abstract
The invention discloses a pixel circuit, a driving method and a display panel, wherein the pixel circuit comprises: the device comprises a driving control module, a data writing module, a capacitor module, a light-emitting device, a detection control module, a voltage conversion control module and an analog-to-digital conversion module; through the arrangement of the voltage conversion control module, when the analog-to-digital conversion module detects that the voltage value on the induction signal line is smaller than the maximum detection threshold value of the analog-to-digital conversion module, a signal of the second voltage signal end is provided for the cathode of the light-emitting device; when the analog-to-digital conversion module detects that the voltage value on the sensing signal line is equal to the maximum detection threshold value of the analog-to-digital conversion module, the signal of the third voltage signal end is provided for the cathode of the light-emitting device, and the range of the voltage which can be detected by the analog-to-digital converter can be effectively enlarged through the arrangement, so that the accuracy of the supplemented data signal is ensured.
Description
Technical Field
The invention relates to the technical field of organic electroluminescence, in particular to a pixel circuit, a driving method and a display panel.
Background
Organic Light Emitting Diodes (OLEDs) are one of the hot spots in the research field of displays, and compared with Liquid Crystal Displays (LCDs), OLEDs have the advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle, fast response speed, and the like. The pixel circuit design is the core technical content of the OLED display, and has important research significance.
Unlike LCDs, which control brightness using a stable voltage, OLEDs are current driven and require a stable current to control light emission. The threshold voltage V of the driving transistor of the pixel circuit is reduced due to aging of the device and the processthThe threshold voltage and mobility of the driving transistor are not stabilized at a certain value, and are constantly shifted, so that compensation by a compensation circuit is required. The pixel circuit in the prior art is shown in fig. 1, which is a commonly used pixel circuit of 3T1C, and the timing sequence thereof is shown in fig. 2In an electrical phase t1, the first switching transistor is turned on to write the data signal into the first node, and the third switching transistor is turned on under the control of the first node to write the data into the second node; the second switch transistor is conducted under the control of the second control signal end to charge the floating induction signal line; and in a sampling stage t2, the analog-to-digital converter ADC acquires the voltage on the sensing signal line and provides the voltage to the external processor for processing to obtain a compensated data signal. But the resulting compensated data signal is inaccurate due to the shift in threshold voltage and mobility variations of the drive transistor causing the voltage on the sense signal line to go beyond the voltage range detected by the analog-to-digital converter.
Therefore, how to expand the range of the voltage that can be detected by the analog-to-digital converter is a problem that needs to be solved by the technical developers.
Disclosure of Invention
Embodiments of the invention provide a pixel circuit, a driving method and a display panel, which are used to enlarge the range of voltages capable of being detected by an analog-to-digital converter.
Accordingly, an embodiment of the present invention provides a pixel circuit, including: the device comprises a driving control module, a data writing module, a capacitor module, a light-emitting device, a detection control module, a voltage conversion control module and an analog-to-digital conversion module; wherein the content of the first and second substances,
the input end of the data writing module is connected with the data signal end, the control end of the data writing module is connected with the scanning 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 data signal of the data signal terminal to the first node under the control of the scanning signal terminal;
the input end of the drive control module is connected with a first voltage signal end, the control end of the drive control module is connected with the first node, and the output end of the drive control module is connected with the second node; the driving control module is used for driving the light-emitting device to emit light under the control of the potential of the first node and the capacitance module;
the first end of the capacitor module is connected with the first node, and the second end of the capacitor module is connected with the second node; the capacitance module is used for keeping the voltage difference between the first node and the second node stable;
the input end of the light-emitting device is connected with the second node, and the output end of the light-emitting device is connected with the input end of the voltage conversion control module;
the control end of the voltage conversion control module is connected with the first control signal end and/or the third control signal end, and the output end of the voltage conversion control module is connected with the second voltage signal end and/or the third voltage signal end; the voltage conversion control module is used for providing a signal of the second voltage signal end or a signal of the third voltage signal end to a cathode of the light-emitting device under the control of the first control signal end and/or the third control signal end, wherein the voltage value of the third voltage signal end is smaller than that of the second voltage signal end;
the input end of the detection control module is connected with the second node, the control end of the detection control module is connected with a second control signal end, and the output end of the detection control module is connected with an induction signal line; the detection control module is used for providing the voltage of the second node to the sensing signal line under the control of the second control signal end;
the input end of the analog-to-digital conversion module is connected with the sensing signal line, and the output end of the analog-to-digital conversion module is connected with an external processor; the analog-to-digital conversion module is used for converting the acquired analog signals on the induction signal line into digital signals and providing the digital signals to the processor.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the driving control module specifically includes: a drive transistor;
the grid electrode of the driving transistor is connected with the first node, the first pole of the driving transistor is connected with the first voltage signal end, and the second pole of the driving transistor is connected with the second node.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the data writing module specifically includes: a first switching transistor;
the grid electrode of the first switch transistor is connected with the scanning signal end, the first pole of the first switch transistor is connected with the data signal end, and the second pole of the first switch transistor is connected with the first node.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the detection control module specifically includes: a second switching transistor;
and the grid electrode of the second switch transistor is connected with the second control signal end, the first pole of the second switch transistor is connected with the second node, and the second pole of the second switch transistor is connected with the induction signal line.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the voltage conversion control module specifically includes: a third switching transistor;
the grid electrode of the third switching transistor is connected with the first control signal end, the first pole of the third switching transistor is connected with the second voltage signal end or the third voltage signal end, and the second pole of the third switching transistor is connected with the cathode of the light-emitting device.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the voltage conversion control module specifically includes: a third switching transistor and a fourth switching transistor;
the grid electrode of the third switching transistor is connected with the first control signal end, the first pole of the third switching transistor is connected with the second voltage signal end, and the second pole of the third switching transistor is connected with the cathode of the light-emitting device;
and the grid electrode of the fourth switching transistor is connected with the third control signal end, the first electrode of the fourth switching transistor is connected with the third voltage signal end, and the second electrode of the fourth switching transistor is connected with the cathode of the light-emitting device.
In a possible implementation manner, in the pixel circuit provided in an embodiment of the present invention, the capacitor module specifically includes: a first 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 second node.
In a possible implementation manner, in the pixel circuit provided by the embodiment of the present invention, the analog-to-digital conversion module includes an analog-to-digital converter.
In a possible implementation manner, in the above pixel circuit provided by the embodiment of the present invention, all the transistors are N-type transistors or P-type transistors.
Correspondingly, an embodiment of the present invention further provides a driving method of any one of the pixel circuits, including:
in the charging stage, the data writing module provides the data signal to the first node under the control of the scanning signal end; the driving control module provides the voltage of the first voltage signal end to the second node under the control of the first node; the voltage conversion control module supplies the voltage of the second voltage signal terminal to the cathode of the light emitting device under the control of the first control signal terminal; the detection control module provides the voltage of the second node to the sensing signal line under the control of the second control signal end;
in the sampling stage, the analog-to-digital conversion module acquires a first voltage value on the sensing signal line, and when the first voltage value is smaller than the maximum threshold value of the analog-to-digital conversion module, the analog-to-digital conversion module provides the voltage value to an external processor; when the first voltage value is equal to the maximum threshold value of the analog-to-digital conversion module, the voltage conversion control module supplies the voltage of the third voltage signal end to the cathode of the light-emitting device under the control of the first control signal end, and the analog-to-digital conversion module supplies the second voltage value acquired on the sensing signal line to the processor;
wherein a voltage on the third voltage signal terminal is less than a voltage on the second voltage signal terminal.
Correspondingly, the embodiment of the invention also provides a display panel, which comprises a plurality of pixel circuits arranged in a matrix, wherein the pixel circuits are any one of the pixel circuits provided by the embodiment of the invention.
The pixel circuit, the driving method and the display panel provided by the embodiment of the invention comprise the following steps: the device comprises a driving control module, a data writing module, a capacitor module, a light-emitting device, a detection control module, a voltage conversion control module and an analog-to-digital conversion module; the control end of the voltage conversion control module is connected with the first control signal end and/or the third control signal end, and the output end of the voltage conversion control module is connected with the second voltage signal end and/or the third voltage signal end; the voltage conversion control module is used for providing a signal of the second voltage signal end or a signal of the third voltage signal end to a cathode of the light-emitting device under the control of the first control signal end and/or the third control signal end, wherein the voltage value of the third voltage signal end is smaller than that of the second voltage signal end; through the arrangement of the voltage conversion control module, when the analog-to-digital conversion module detects that the voltage value on the induction signal line is smaller than the maximum detection threshold value of the analog-to-digital conversion module, a signal of the second voltage signal end is provided for the cathode of the light-emitting device; when the analog-to-digital conversion module detects that the voltage value on the sensing signal line is equal to the maximum detection threshold value of the analog-to-digital conversion module, the signal of the third voltage signal end is provided for the cathode of the light-emitting device, and the range of the voltage which can be detected by the analog-to-digital converter can be effectively enlarged through the arrangement, so that the accuracy of the supplemented data signal is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a conventional pixel circuit 3T 1C;
FIG. 2 is a circuit timing diagram of the pixel circuit shown in FIG. 1;
fig. 3 is a schematic structural diagram of a pixel circuit according to an embodiment of the invention;
fig. 4 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
fig. 5 is a second schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
fig. 6 is a flowchart of a pixel circuit driving method according to an embodiment of the invention.
Detailed Description
In order to compensate the threshold voltage and mobility of the driving transistor, the prior art generally adopts a pixel circuit of 3T1C as shown in fig. 2 to compensate the DATA signal, and the DATA signal is written into the DATA signal terminal DATA in the charging phase to charge the floating sensing signal line SENSE; in the sampling stage, the analog-to-digital converter ADC collects the voltage value on the sensing signal line SENSE and provides the voltage value to an external processor for calculation to obtain a real data signal to be written, i.e. a compensated data signal. For example, the voltage value of the written data signal is 3.5V, the voltage value of the sensing signal line SENSE detected by the analog-to-digital converter ADC is 2V, and the two values are provided to the processor, and the actual compensated data signal that needs to be written is calculated in the compensation procedure. In the present pixel circuit, the voltage of the second voltage signal terminal VSS1 at 0V is used for detection, but if the sensing signal line SENSE is charged to 4V, the maximum detection threshold of the analog-to-digital converter ADC is 3V, the voltage on the sensing signal line detected by the analog-to-digital converter ADC is 3V, and the voltage returned to the compensation algorithm reaches 3V at maximum, then the calculated compensated data signal is inaccurate.
In order to make the objects, technical solutions, and advantages of the present invention clearer, specific embodiments of a pixel circuit, a driving method, and a display panel according to an embodiment of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Specifically, an embodiment of the present invention provides a pixel circuit, as shown in fig. 3, including: the device comprises a driving control module 2, a data writing module 1, a capacitance module 3, a light-emitting device OLED, a detection control module 5, a voltage conversion control module 4 and an analog-to-digital conversion module 6; wherein the content of the first and second substances,
the input end of the DATA writing module 1 is connected with a DATA signal end DATA, the control end of the DATA writing module 1 is connected with a scanning signal end SCAN, and the output end of the DATA writing module 1 is connected with a first node A; the DATA writing module 1 is configured to provide a DATA signal of a DATA signal terminal DATA to a first node a under the control of a SCAN signal terminal SCAN;
the input end of the driving control module 2 is connected with a first voltage signal end VDD, the control end of the driving control module 2 is connected with a first node A, and the output end of the driving control module 2 is connected with a second node B; the driving control module 2 is used for driving the light-emitting device OLED to emit light under the control of the potential of the first node A and the capacitance module 3;
the first end of the capacitor module 3 is connected with the first node A, and the second end is connected with the second node B; the capacitance module 3 is used for keeping the voltage difference between the first node a and the second node B stable;
the input end of the light-emitting device OLED is connected with the second node B, and the output end of the light-emitting device OLED is connected with the input end of the voltage conversion control module 4;
the control terminal of the voltage conversion control module 4 is connected to the first control signal terminal G1 and/or the third control signal terminal G3, and the output terminal of the voltage conversion control module 4 is connected to the second voltage signal terminal VSS1 and/or the third voltage signal terminal VSS 2; the voltage conversion control module 4 is configured to provide a signal of the second voltage signal terminal VSS1 or a signal of the third voltage signal terminal VSS2 to the cathode of the light emitting device OLED under the control of the first control signal terminal G1 and/or the third control signal terminal G3, wherein the voltage value of the third voltage signal terminal VSS2 is smaller than the voltage value of the second voltage signal terminal VSS 1;
the input end of the detection control module 5 is connected with the second node B, the control end of the detection control module 5 is connected with a second control signal end G2, and the output end of the detection control module 5 is connected with an induction signal line SENSE; the detection control module 5 is used for providing the voltage of the second node B to the sensing signal line SENSE under the control of a second control signal terminal G2;
the input end of the analog-to-digital conversion module 6 is connected with the sensing signal line SENSE, and the output end of the analog-to-digital conversion module 6 is connected with the external processor; the analog-to-digital conversion module 6 is used for converting the acquired analog signal on the sensing signal line SENSE into a digital signal and providing the digital signal to the processor.
The pixel circuit provided by the embodiment of the invention comprises: the device comprises a driving control module, a data writing module, a capacitor module, a light-emitting device, a detection control module, a voltage conversion control module and an analog-to-digital conversion module; the control end of the voltage conversion control module is connected with the first control signal end and/or the third control signal end, and the output end of the voltage conversion control module is connected with the second voltage signal end and/or the third voltage signal end; the voltage conversion control module is used for providing a signal of a second voltage signal end or a signal of a third voltage signal end to the cathode of the light-emitting device under the control of the first control signal end and/or the third control signal end, wherein the voltage value of the third voltage signal end is smaller than that of the second voltage signal end; through the arrangement of the voltage conversion control module, when the analog-to-digital conversion module detects that the voltage value on the induction signal line is smaller than the maximum detection threshold value of the analog-to-digital conversion module, a signal of the second voltage signal end is provided for the cathode of the light-emitting device; when the analog-to-digital conversion module detects that the voltage value on the sensing signal line is equal to the maximum detection threshold value of the analog-to-digital conversion module, the signal of the third voltage signal end is provided for the cathode of the light-emitting device, and the range of the voltage which can be detected by the analog-to-digital converter can be effectively enlarged through the arrangement, so that the accuracy of the supplemented data signal is ensured.
The present invention will be described in detail with reference to specific examples. It should be noted that the present embodiment is intended to better explain the present invention, but not to limit the present invention.
Preferably, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 4, the driving control module 2 specifically includes: the driving transistor DT 1;
the gate of the driving transistor DT1 is connected to the first node a, the first pole of the driving transistor DT1 is connected to the first voltage signal terminal VDD, and the second pole of the driving transistor DT1 is connected to the second node B.
In practical implementation, in the pixel circuit provided in the embodiment of the present invention, the driving transistor DT1 is an N-type transistor. In order to ensure that the driving transistor DT1 can work normally, the voltage of the corresponding first voltage signal terminal VDD is generally a positive voltage, and the voltages of the second voltage signal terminal VSS1 and the third voltage signal terminal VSS2 are generally grounded or negative.
Preferably, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 4, the data writing module 1 specifically includes: a first switching transistor T1;
the gate of the first switching transistor T1 is connected to the SCAN signal terminal SCAN, the first pole of the first switching transistor T1 is connected to the DATA signal terminal DATA, and the second pole of the first switching transistor T1 is connected to the first node a.
Further, in practical implementation, as shown in fig. 4, the first switching transistor T1 may be an N-type transistor, in which the first switching transistor T1 is in a turned-on state when the signal of the SCAN signal terminal SCAN is at a high level, and the first switching transistor T1 is in a turned-off state when the signal of the SCAN signal terminal SCAN is at a low level; the first switching transistor T1 may also be a P-type transistor (not shown in the figure), in which case the first switching transistor T1 is in a conducting state when the signal of the SCAN signal terminal SCAN is low, and the first switching transistor T1 is in a blocking state when the signal of the SCAN signal terminal SCAN is high; and is not limited herein.
Specifically, in the pixel circuit provided in the embodiment of the present invention, when the first switching transistor is in a conducting state under the control of the scan signal, the data signal is transmitted to the first node through the conducting first switching transistor, so as to charge the voltage of the first node.
The above is merely an example of the specific structure of the data writing module in the pixel circuit, and in the specific implementation, the specific structure of the data writing module is not limited to the above structure provided by the embodiment of the present invention, and may be other structures known to those skilled in the art, which is not limited herein.
Preferably, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 4, the detection control module 5 specifically includes: a second switching transistor T2;
the gate of the second switching transistor T2 is connected to the second control signal terminal G2, the first pole of the second switching transistor T2 is connected to the second node B, and the second pole of the second switching transistor T2 is connected to the sensing signal line SENSE.
Further, in practical implementation, as shown in fig. 4, the second switching transistor T2 may be an N-type transistor, in which case, the second switching transistor T2 is in a conducting state when the signal of the second control signal terminal G2 is at a high level, and the second switching transistor T2 is in a blocking state when the signal of the second control signal terminal G2 is at a low level; the second switch transistor T2 may also be a P-type transistor (not shown in the figure), in which case the second switch transistor T2 is in a conducting state when the signal of the second control signal terminal G2 is at a low level, and the second switch transistor T2 is in a blocking state when the signal of the second control signal terminal G2 is at a high level; and is not limited herein.
Specifically, in the pixel circuit provided in the embodiment of the present invention, when the second switching transistor is in a conducting state under the control of the second control signal terminal, the voltage of the second node is transmitted to the sensing signal line through the conducting second switching transistor, so as to charge the sensing signal line.
The above is merely an example of the specific structure of the detection control module in the pixel circuit, and in the specific implementation, the specific structure of the detection control module is not limited to the above structure provided by the embodiment of the present invention, and may also be other structures known by those skilled in the art, and is not limited herein.
Preferably, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 4, the voltage conversion control module 4 specifically includes: a third switching transistor T3;
a gate of the third switching transistor T3 is connected to the first control signal terminal G1, a first pole of the third switching transistor T3 is connected to the second voltage signal terminal VSS1 or the third voltage signal terminal VSS2, and a second pole of the third switching transistor T3 is connected to a cathode of the light emitting device OLED.
Further, in practical implementation, as shown in fig. 4, the third switching transistor T3 may be an N-type transistor, in which case, the third switching transistor T3 is in a turned-on state when the signal of the first control signal terminal G1 is at a high level, and the third switching transistor T3 is in a turned-off state when the signal of the first control signal terminal G1 is at a low level; the third switching transistor T3 may also be a P-type transistor (not shown in the figure), in which case the third switching transistor T3 is in a conducting state when the signal of the first control signal terminal G1 is at a low level, and the third switching transistor T3 is in a blocking state when the signal of the first control signal terminal G1 is at a high level; and is not limited herein.
In particular, in the pixel circuit provided by the embodiment of the invention, when the third switching transistor is in a conducting state under the control of the first control signal terminal, the signal of the second voltage signal terminal or the signal of the third voltage signal terminal is transmitted to the cathode of the light emitting device through the conducting third switching transistor.
Optionally, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 5, the voltage conversion control module 4 specifically includes: a third switching transistor T3 and a fourth switching transistor T4;
a gate electrode of the third switching transistor T3 is connected to the first control signal terminal G1, a first electrode of the third switching transistor T3 is connected to the second voltage signal terminal VSS1, and a second electrode of the third switching transistor T3 is connected to a cathode electrode of the light emitting device OLED;
a gate electrode of the fourth switching transistor T4 is connected to the third control signal terminal G3, a first electrode of the fourth switching transistor T4 is connected to the third voltage signal terminal VSS2, and a second electrode of the fourth switching transistor T4 is connected to the cathode electrode of the light emitting device OLED.
The foregoing merely illustrates two specific structures of the voltage conversion control module in the pixel circuit, and in the specific implementation, the specific structure of the voltage conversion control module is not limited to the above structure provided in the embodiment of the present invention, and may also be other structures known to those skilled in the art, and is not limited herein.
Preferably, in the pixel circuit provided in the embodiment of the present invention, as shown in fig. 4, the capacitor module 3 specifically includes: a first capacitance C1;
one terminal of the first capacitor C1 is connected to the first node a, and the other terminal of the first capacitor C1 is connected to the second node B.
In practical implementation, in the pixel circuit provided in the embodiment of the present invention, the analog-to-digital conversion module 6 includes an analog-to-digital converter. Of course, any other device capable of implementing the analog-to-digital conversion function may be used, and is not limited herein.
In a specific implementation, in the pixel circuit provided in the embodiment of the present invention, all the transistors are N-type transistors or P-type transistors, which is not limited herein.
Preferably, the driving transistor and the switching transistor in the pixel circuit provided by the embodiment of the invention may all be designed as N-type transistors, so that the manufacturing process flow of the pixel circuit may be simplified.
It should be noted that, in the above embodiments of the present invention, the driving transistor is an N-type transistor, and the case where the driving transistor is a P-type transistor and the same design principle is adopted also belongs to the protection scope of the present invention.
In a specific implementation, the driving transistor and the switching transistor may be Thin Film Transistors (TFTs) or Metal Oxide Semiconductor field effect transistors (MOS), and are not limited herein. In specific implementations, the first and second poles of these transistors may be interchanged in function, depending on the type of transistor and the input signal, and are not specifically distinguished herein.
The following describes the operation of the pixel circuit provided in the embodiment of the present invention by taking the pixel circuit shown in fig. 4 as an example. The voltage of the DATA signal terminal DATA is 3.5V, the voltage of the second voltage signal terminal VSS1 is 0V, the voltage of the third voltage signal terminal VSS2 is-3V, the maximum threshold of the analog-to-digital converter is 3V, and all the transistors are N-type transistors.
In the charging stage, the SCAN signal terminal SCAN is at a high level, the first switching transistor T1 is turned on, the DATA signal (3.5V) of the DATA signal terminal DATA is provided to the first node a, and the first node a is at a high potential, and the driving transistor DT1 is turned on under the control of the potential of the first node a to charge the second node B; the third switching transistor T3 has a first electrode connected to the second voltage signal terminal VSS1, and supplies the voltage (0V) of the second voltage signal terminal VSS1 to the cathode of the light emitting device OLED, and the second control signal terminal G2 has a high potential, and the second switching transistor T2 is turned on, and supplies the potential of the second node B to the sensing signal line SENSE, thereby charging the sensing signal line SENSE.
In the sampling stage, the analog-to-digital converter detects the voltage value on the sensing signal SENSE line, and when the voltage value on the sensing signal line SENSE is detected to be smaller than the maximum threshold value (3V) of the analog-to-digital converter, if the detected voltage value on the sensing signal line SENSE is 2V, the voltage value is directly provided to an external processor for calculation so as to obtain a compensated data signal; however, when the voltage value on the sensing signal line SENSE is detected to be equal to the maximum threshold value (3V) of the analog-to-digital converter, it indicates that the sensing signal line SENSE is charged to 3V or more (e.g., 4V), the first electrode of the third switching transistor T3 is connected to the third voltage signal terminal VSS2, the voltage (-3V) of the third voltage signal terminal VSS2 is provided to the cathode of the light emitting device OLED, the voltage detected by the analog-to-digital converter is 1V, and the actual charging voltage on the sensing signal line SENSE is 4V ═ 1+ 3V, so that the accurate data signal to be compensated can be obtained through calculation.
By the method, the voltage range detected by the analog-to-digital converter can be increased to 0-6V, the voltage detection range of the analog-to-digital converter is doubled, a chip of the analog-to-digital converter does not need to be changed, and production cost is saved.
It should be noted that the above-mentioned embodiment is only a preferred embodiment, and is not limited thereto, and technical solutions according to the above-mentioned principles are within the protection scope of the present invention, and are not described in detail herein.
Based on the same inventive concept, an embodiment of the present invention further provides a method for driving any one of the pixel circuits, as shown in fig. 6, including:
s601, in a charging stage, a data writing module supplies a data signal to a first node under the control of a scanning signal end; the driving control module provides the voltage of the first voltage signal end to the second node under the control of the first node; the voltage conversion control module supplies the voltage of the second voltage signal end to the cathode of the light-emitting device under the control of the first control signal end; the detection control module provides the voltage of the second node to the induction signal line under the control of the second control signal end;
s602, in a sampling stage, the analog-to-digital conversion module acquires a first voltage value on the sensing signal line, and when the first voltage value is smaller than the maximum threshold value of the analog-to-digital conversion module, the analog-to-digital conversion module provides the voltage value to an external processor; when the first voltage value is equal to the maximum threshold value of the analog-to-digital conversion module, the voltage conversion control module supplies the voltage of the third voltage signal end to the cathode of the light-emitting device under the control of the first control signal end, and the analog-to-digital conversion module supplies the second voltage value acquired on the induction signal line to the processor;
wherein the voltage at the third voltage signal terminal is less than the voltage at the second voltage signal terminal.
The specific operation principle of the driving method of the pixel circuit is described in the above description of the structure of the pixel circuit, and will not be described in detail here.
Based on the same inventive concept, an embodiment of the present invention further provides a display panel, including a plurality of pixel circuits arranged in a matrix, where the pixel circuit is any one of the pixel circuits provided in the embodiments of the present invention. Since the principle of the display panel to solve the problem is similar to the pixel circuit, the implementation of the pixel circuit in the display panel can be referred to the implementation of the pixel circuit in the foregoing example, and repeated descriptions are omitted.
Based on the same inventive concept, the embodiment of the invention further provides a display device, which comprises the organic light emitting display panel provided by the embodiment of the invention. The display device may be a display, a mobile phone, a television, a notebook computer, an electronic paper, a digital photo frame, a navigator, an all-in-one machine, etc., and other essential components of the display device are those which should be understood by those skilled in the art, and are not described herein in detail nor should be construed as limitations of the present invention.
The pixel circuit, the driving method and the display panel provided by the embodiment of the invention comprise the following steps: the device comprises a driving control module, a data writing module, a capacitor module, a light-emitting device, a detection control module, a voltage conversion control module and an analog-to-digital conversion module; the control end of the voltage conversion control module is connected with the first control signal end and/or the third control signal end, and the output end of the voltage conversion control module is connected with the second voltage signal end and/or the third voltage signal end; the voltage conversion control module is used for providing a signal of the second voltage signal end or a signal of the third voltage signal end to a cathode of the light-emitting device under the control of the first control signal end and/or the third control signal end, wherein the voltage value of the third voltage signal end is smaller than that of the second voltage signal end; through the arrangement of the voltage conversion control module, when the analog-to-digital conversion module detects that the voltage value on the induction signal line is smaller than the maximum detection threshold value of the analog-to-digital conversion module, a signal of the second voltage signal end is provided for the cathode of the light-emitting device; when the analog-to-digital conversion module detects that the voltage value on the sensing signal line is equal to the maximum detection threshold value of the analog-to-digital conversion module, the signal of the third voltage signal end is provided for the cathode of the light-emitting device, and the range of the voltage which can be detected by the analog-to-digital converter can be effectively enlarged through the arrangement, so that the accuracy of the supplemented data signal is ensured.
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 (10)
1. A pixel circuit, comprising: the device comprises a driving control module, a data writing module, a capacitor module, a light-emitting device, a detection control module, a voltage conversion control module and an analog-to-digital conversion module; wherein the content of the first and second substances,
the input end of the data writing module is connected with the data signal end, the control end of the data writing module is connected with the scanning 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 data signal of the data signal terminal to the first node under the control of the scanning signal terminal;
the input end of the drive control module is connected with a first voltage signal end, the control end of the drive control module is connected with the first node, and the output end of the drive control module is connected with the second node; the driving control module is used for driving the light-emitting device to emit light under the control of the potential of the first node and the capacitance module;
the first end of the capacitor module is connected with the first node, and the second end of the capacitor module is connected with the second node; the capacitance module is used for keeping the voltage difference between the first node and the second node stable;
the input end of the light-emitting device is connected with the second node, and the output end of the light-emitting device is connected with the input end of the voltage conversion control module;
the control end of the voltage conversion control module is connected with the first control signal end and/or the third control signal end, and the output end of the voltage conversion control module is connected with the second voltage signal end and/or the third voltage signal end; the voltage conversion control module is used for providing a signal of the second voltage signal end or a signal of the third voltage signal end to a cathode of the light-emitting device under the control of the first control signal end and/or the third control signal end, wherein the voltage value of the third voltage signal end is smaller than that of the second voltage signal end;
the input end of the detection control module is connected with the second node, the control end of the detection control module is connected with a second control signal end, and the output end of the detection control module is connected with an induction signal line; the detection control module is used for providing the voltage of the second node to the sensing signal line under the control of the second control signal end;
the input end of the analog-to-digital conversion module is connected with the sensing signal line, and the output end of the analog-to-digital conversion module is connected with an external processor; the analog-to-digital conversion module is used for converting the acquired analog signals on the induction signal line into digital signals and providing the digital signals to the processor.
2. The pixel circuit according to claim 1, wherein the driving control module specifically comprises: a drive transistor;
the grid electrode of the driving transistor is connected with the first node, the first pole of the driving transistor is connected with the first voltage signal end, and the second pole of the driving transistor is connected with the second node.
3. The pixel circuit of claim 1, wherein the data writing module specifically comprises: a first switching transistor;
the grid electrode of the first switch transistor is connected with the scanning signal end, the first pole of the first switch transistor is connected with the data signal end, and the second pole of the first switch transistor is connected with the first node.
4. The pixel circuit according to claim 1, wherein the detection control module specifically comprises: a second switching transistor;
and the grid electrode of the second switch transistor is connected with the second control signal end, the first pole of the second switch transistor is connected with the second node, and the second pole of the second switch transistor is connected with the induction signal line.
5. The pixel circuit according to claim 1, wherein the voltage conversion control module specifically comprises: a third switching transistor;
the grid electrode of the third switching transistor is connected with the first control signal end, the first pole of the third switching transistor is connected with the second voltage signal end or the third voltage signal end, and the second pole of the third switching transistor is connected with the cathode of the light-emitting device.
6. The pixel circuit according to claim 1, wherein the voltage conversion control module specifically comprises: a third switching transistor and a fourth switching transistor;
the grid electrode of the third switching transistor is connected with the first control signal end, the first pole of the third switching transistor is connected with the second voltage signal end, and the second pole of the third switching transistor is connected with the cathode of the light-emitting device;
and the grid electrode of the fourth switching transistor is connected with the third control signal end, the first electrode of the fourth switching transistor is connected with the third voltage signal end, and the second electrode of the fourth switching transistor is connected with the cathode of the light-emitting device.
7. The pixel circuit of claim 1, wherein the capacitance module specifically comprises: a first 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 second node.
8. The pixel circuit of claim 1, wherein the analog-to-digital conversion module comprises an analog-to-digital converter.
9. A method of driving a pixel circuit according to any one of claims 1 to 8, comprising:
in the charging stage, the data writing module provides the data signal to the first node under the control of the scanning signal end; the driving control module provides the voltage of the first voltage signal end to the second node under the control of the first node; the voltage conversion control module supplies the voltage of the second voltage signal terminal to the cathode of the light emitting device under the control of the first control signal terminal; the detection control module provides the voltage of the second node to the sensing signal line under the control of the second control signal end;
in the sampling stage, the analog-to-digital conversion module acquires a first voltage value on the sensing signal line, and when the first voltage value is smaller than the maximum threshold value of the analog-to-digital conversion module, the analog-to-digital conversion module provides the voltage value to an external processor; when the first voltage value is equal to the maximum threshold value of the analog-to-digital conversion module, the voltage conversion control module supplies the voltage of the third voltage signal end to the cathode of the light-emitting device under the control of the first control signal end, and the analog-to-digital conversion module supplies the second voltage value acquired on the sensing signal line to the processor;
wherein a voltage on the third voltage signal terminal is less than a voltage on the second voltage signal terminal.
10. A display panel comprising a plurality of pixel circuits arranged in a matrix, wherein the pixel circuits are the pixel circuits according to any one of claims 1 to 8.
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| CN109671384B (en) * | 2019-01-29 | 2021-11-12 | 维沃移动通信有限公司 | Terminal and photosensitive detection method for terminal |
| CN110349542A (en) * | 2019-07-15 | 2019-10-18 | 京东方科技集团股份有限公司 | A kind of display panel, display device and its control method |
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