CN114639347A - Pixel driving circuit, driving method and display device - Google Patents

Pixel driving circuit, driving method and display device Download PDF

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Publication number
CN114639347A
CN114639347A CN202210453420.XA CN202210453420A CN114639347A CN 114639347 A CN114639347 A CN 114639347A CN 202210453420 A CN202210453420 A CN 202210453420A CN 114639347 A CN114639347 A CN 114639347A
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China
Prior art keywords
coupled
compensation capacitor
voltage
switch unit
unit
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CN202210453420.XA
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Chinese (zh)
Inventor
周仁杰
郑浩旋
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HKC Co Ltd
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HKC Co Ltd
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Priority to CN202210453420.XA priority Critical patent/CN114639347A/en
Publication of CN114639347A publication Critical patent/CN114639347A/en
Priority to PCT/CN2022/133802 priority patent/WO2023207057A1/en
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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
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

Abstract

The application provides a pixel driving circuit, a driving method and a display device, which can make the current passing through an organic light emitting diode independent of the cathode of a power supply and the threshold voltage of each thin film transistor, thereby making the display uniform; in addition, the compensation capacitor unit is discharged at different stages through the two discharging modules, and then the compensation capacitor unit provides a discharge channel at each stage, so that parasitic charges in the circuit can be eliminated.

Description

Pixel driving circuit, driving method and display device
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a pixel driving circuit, a driving method, and a display device.
Background
With the development of the liquid crystal Display field, the advantages of self-luminescence, lightness and thinness, and the like of the Organic Light Emitting Display (OLED) Display technology are gradually applied to products such as TV, mobile phone, pen, and the like, because the OLED belongs to current driving, when the threshold voltage Vth of a Thin Film Transistor (TFT) is shifted, the current driving of the OLED will not be stable and changed, and further brightness unevenness is caused, and current compensation is performed by driving a compensation circuit at present, but the problem that circuit parasitic charges cannot be eliminated exists.
Disclosure of Invention
The present application provides a pixel driving circuit, a driving method and a display device, which are intended to solve the problem that the parasitic charges in the compensation circuit cannot be eliminated in the exemplary technology.
An embodiment of a first aspect of the present application provides a pixel driving circuit, including:
the first end of the compensation capacitor unit is coupled with the driving voltage end, and the second end of the compensation capacitor unit is coupled with the data voltage end;
the control end of the first switch unit is coupled with the first end of the compensation capacitor unit, the input end of the first switch unit is coupled with the driving voltage end, and the output end of the first switch unit is coupled with a light-emitting device;
the first discharging module is used for reducing the driving voltage written in the first end of the compensation capacitor unit to a first set threshold value in a first stage; and
the second discharging module is used for reducing the data voltage written in the second end of the compensation capacitor unit to a second set threshold value in the second stage; in the second stage, the first discharging module is disconnected from the first end of the compensation capacitor unit, so that the voltage of the first end of the compensation capacitor unit jumps to a target voltage, and the target voltage is greater than the threshold voltage of the first switch unit.
In an alternative embodiment, the first discharging module includes: and the control end of the first discharge switch unit is coupled with the first scanning line, the input end of the first discharge switch unit is coupled with the driving voltage end, and the output end of the first discharge switch unit is coupled with a grounding end.
In an alternative embodiment, the first discharging module includes: and the control end of the first discharge switch unit is coupled with the first scanning line, the input end of the first discharge switch unit is coupled between the first end of the compensation capacitor unit and the control end of the first switch unit, and the output end of the first discharge switch unit is coupled with a grounding end.
In an optional embodiment, the first discharging module further comprises: and a control terminal of the second discharge switch unit is coupled to the first scan line, and an input terminal and an output terminal of the second discharge switch unit are coupled between the first switch unit and the ground terminal.
In an alternative embodiment, the second discharge module includes:
and a control end of the third discharge switch unit is coupled to the second scanning line, and an input end of the third discharge switch unit is coupled between the second end of the compensation capacitor unit and the data voltage end.
In an alternative embodiment, the pixel driving circuit further includes:
and the control end of the second switch unit is coupled with the third scanning line, the input end of the second switch unit is coupled with the driving voltage end, and the output end of the second switch unit is coupled between the first end of the compensation capacitor unit and the control end of the first switch unit.
In an alternative embodiment, the pixel driving circuit further includes:
and a control end of the third switching unit is coupled to the fourth scanning line, an input end of the third switching unit is coupled to the data voltage end, and an output end of the third switching unit is coupled to the second end of the compensation capacitor unit.
In an alternative embodiment, the pixel driving circuit further includes: and the cathode of the diode element is coupled with a power supply of the driving voltage, and the anode of the diode element is used as the driving voltage end.
In a second aspect of the present invention, a driving method using the pixel driving circuit is provided, including:
writing a driving voltage into a first end of the compensation capacitor unit, and writing a data voltage into a second end of the compensation capacitor unit;
in the first stage, the driving voltage written in the first end of the compensation capacitor unit is reduced to a first set threshold value;
in a second stage, the data voltage written in the second end of the compensation capacitor unit is reduced to a second set threshold value, and the first discharging module and the first end of the compensation capacitor unit are disconnected, so that the voltage of the first end of the compensation capacitor unit jumps to a target voltage, wherein the target voltage is greater than the threshold voltage of the first switch unit;
and the second discharging module is switched off, and the first switching unit is controlled to be switched on by the target voltage at the first end of the compensation capacitor unit so as to drive the light-emitting device to emit light by the driving voltage.
Embodiments of a third aspect of the present application provide a display apparatus including a display panel including a plurality of pixel units each including a plurality of light emitting devices, and the pixel driving circuit as described above.
According to the technical scheme, the pixel driving circuit, the driving method and the display device provided by the application can enable the current passing through the OLED diode to be independent of the cathode of the power supply and the threshold voltage of each thin film transistor, so that the display can be uniform; in addition, the compensation capacitor unit is discharged at different stages through the two discharging modules, and then the compensation capacitor unit provides a discharge channel at each stage, so that parasitic charges in the circuit can be eliminated.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following descriptions are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a pixel driving circuit in an embodiment of the present application.
Fig. 2 is a second schematic diagram of a pixel driving circuit according to an embodiment of the present application.
Fig. 3 is a timing control diagram corresponding to fig. 1.
Fig. 4 is a timing control diagram corresponding to fig. 2.
Fig. 5 is a schematic structural diagram of a display device in an embodiment of the present application.
Reference numerals are as follows: 1-a first discharge module, 2-a second discharge module, Vdd-driving voltage terminal, Vdata-data voltage terminal, D1-diode element, OLED-light emitting device, T11-a first switching unit, T12-a second switching unit, T21-a first discharge switching unit, T22-a second discharge switching unit, T23-a third discharge switching unit, S1-a first scan line, S2-a second scan line, S3-a third scan line, S4-a fourth scan line, C-compensation capacitor, a first terminal of a-compensation capacitor, a second terminal of a B-compensation capacitor; 20-display means, 21-conductor, 22-pixel driving circuit, 23-light emitting device.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The pixel driving circuit, the driving method, and the display device disclosed in the present application can be used in the field of display technology, and can also be used in any field other than the field of display technology.
Example 1
Fig. 1 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present disclosure, as shown in fig. 1, the pixel driving circuit specifically includes: a first end A of the compensation capacitor unit C is coupled with a driving voltage end Vdd, and a second end B of the compensation capacitor unit C is coupled with a data voltage end Vdata; a first switch unit T11, wherein a control terminal of the first switch unit T11 is coupled to the first terminal a of the compensation capacitor unit C, an input terminal thereof is coupled to the driving voltage terminal Vdd, and an output terminal thereof is coupled to a light emitting device; the first discharging module 1 is used for reducing the driving voltage written in the first end A of the compensation capacitor unit C to a first set threshold value in a first stage; the second discharging module 2 is used for reducing the data voltage written in the second end B of the compensation capacitor unit C to a second set threshold value in the second stage; wherein in the second phase, the first discharging module is disconnected from the first terminal a of the compensation capacitor unit C, so that the voltage of the first terminal a of the compensation capacitor unit C jumps to a target voltage, and the target voltage is greater than the threshold voltage of the first switch unit T11.
It can be understood that, in the present application, the first set threshold and the second set threshold may be configured by using different circuit structures based on requirements.
It is understood that parasitic charges exist throughout the circuit and cannot be accurately detected.
For example, when the driving voltage written into the first end a of the compensation capacitor unit C needs to be reduced to the sum of the threshold voltages of the n thin film transistors, the first discharge module is configured such that the n thin film transistors are connected in series and connected to a ground terminal, so that the voltage of the first end a of the compensation capacitor unit C can be reduced to the sum of the threshold voltages of the n thin film transistors by using a voltage division principle.
It can be understood that the driving voltage written into the first end a of the compensation capacitor unit C can be reduced to the first set threshold by other methods, for example, a voltage dividing resistor is connected between the ground terminal and the first end a of the compensation capacitor unit C, and the voltage of the first end a of the compensation capacitor unit C is adjusted by the size of the resistor.
In a preferred embodiment, as shown in fig. 1, the first discharging module includes: a first discharge switch unit T21, wherein a control terminal of the first discharge switch unit T21 is coupled to the first scan line S1, an input terminal thereof is coupled to the driving voltage terminal Vdd, and an output terminal thereof is coupled to a ground terminal. In this embodiment, the first discharge switch unit T21 is controlled to be turned on through the first scan line S1, when the first discharge switch unit T21 is turned on, the first discharge switch unit T21 is coupled to the driving voltage terminal Vdd, the first terminal a of the compensation capacitor unit C is coupled to the driving voltage terminal Vdd, and the first terminal a of the compensation capacitor unit C and the first discharge switch unit T21 are coupled to the driving voltage terminal Vdd at the same time, so that the first terminal a of the compensation capacitor unit C and the first discharge switch unit T21 are also in a "coupled" state, at this time, the first terminal a of the compensation capacitor unit C can be discharged through the first discharge switch unit T21, and the compensation capacitor unit C can be discharged to the threshold voltage of the first discharge switch unit T21 because the output terminal of the first discharge switch unit T21 is coupled to the ground terminal, so that when the first discharge switch unit T21 is turned on, the first terminal a of the compensation capacitor unit C is discharged to the threshold voltage of the first discharge switch unit T21, therefore, it can be understood that the first set threshold in the present embodiment is Vth, which is not explained herein.
In another embodiment of the present invention, as shown in fig. 2, the first discharge module 1 includes: a first discharge switch unit T21, wherein a control terminal of the first discharge switch unit T21 is coupled to the first scan line S1, an input terminal is coupled between the first terminal a of the compensation capacitor unit C and the control terminal of the first switch unit T11, and an output terminal is coupled to a ground terminal. In this embodiment, the input terminal of the first discharging switch unit T21 is coupled between the first terminal a of the compensation capacitor unit C and the control terminal of the first switch unit T11, so that the first discharging switch unit T21 is not coupled to the driving voltage terminal Vdd, and when the first discharging switch unit T21 is turned on, the first terminal a of the compensation capacitor unit C is discharged to the threshold voltage Vth of the first discharging switch unit T21.
Further, the first discharge module 1 may include a plurality of discharge switch units, for example, the first discharge module 1 further includes a second discharge switch unit T22, and a control terminal of the second discharge switch unit T22 is coupled to the scan line, and an input terminal and an output terminal are coupled between the first switch unit T11 element and the ground terminal, that is, the first discharge switch unit T21 and the second discharge switch unit T22 are arranged in series, in this embodiment, it is known that, since the first discharge switch unit T21 and the second discharge switch unit T22 are controlled by one scan line, both may be turned on and off at the same time, and when both are turned on at the same time, the first terminal a of the compensation capacitor unit C is discharged to the sum of the threshold voltages of the first discharge switch unit T21 and the second discharge switch unit T22.
For example, in some embodiments, the threshold voltages of the first and second discharging switch units T21 and T22 are the same, i.e., the first terminal a of the compensation capacitor unit C is discharged to 2 Vth.
Further, in some embodiments, the second discharging module 2 includes: a third discharge switch unit T23, wherein a control terminal of the third discharge switch unit T23 is coupled to the second scan line S2, and an input terminal thereof is coupled between the second terminal B of the compensation capacitor unit C and the data voltage terminal Vdata.
As shown in fig. 1 or fig. 2, the third discharging switch unit T23 has the same principle as the first discharging switch unit T21 or the second discharging switch unit T22, and is controlled to be turned on by a scan line, and when turned on, the input terminal is coupled between the second terminal B of the compensation capacitor unit C and the data voltage terminal Vdata, so that the voltage at the second terminal B of the compensation capacitor unit C is reduced to Vth.
It should be noted that, in the second stage, the voltage at the second end B of the compensation capacitor unit C is decreased to Vth, and at this time, the first discharging module is disconnected from the first end a of the compensation capacitor unit C, because the voltage difference of the capacitor voltage does not suddenly change, after the voltage at the second end B of the compensation capacitor unit C is decreased to Vth, the voltage at the first end a is originally Vth, the voltage at the second end B is Vdata, and the voltage drop difference formed at the second end B is: Vdata-Vth when the voltage of the first terminal a jumps from Vth to Vdata, thereby turning on the first switching unit T11 through Vdata, so that the driving voltage terminal Vdd drives the light emitting device to emit light.
In addition, in a preferred embodiment, in order to avoid a situation that Vdata may be smaller than the threshold voltage of the first switch unit T11, the first discharging module of the present application includes two discharging switch units (the first discharging switch unit T21 and the second discharging switch unit T22), in this embodiment, in the second stage, the voltage of the second end B of the compensation capacitor unit C is dropped to Vth, and at this time, the first discharging module is disconnected from the first end a of the compensation capacitor unit C, because the voltage difference of the capacitor voltage does not suddenly change, after the voltage of the second end B of the compensation capacitor unit C is dropped to Vth, the voltage of the first end a is originally 2Vth, the voltage of the second end B is Vdata, and the drop difference formed by the second end B is: Vdata-Vth when the voltage of the first terminal a jumps from 2Vth to Vdata + Vth, thereby turning on the first switching unit T11 through Vdata + Vth, so that the driving voltage terminal Vdd drives the light emitting device to emit light.
Further, in the above embodiment, a second switch unit T12 may be disposed between the driving voltage terminal Vdd and the compensation capacitor unit C, whether the driving voltage is continuously coupled to the first terminal a of the compensation capacitor unit C is controlled by the second switch unit T12, and the first switch unit T11 may be turned off by controlling the second switch unit T12 to be turned on, so as to prevent the pixel light emitting unit from emitting light when the first switch unit T11 is turned on when the light emission is not required.
In this embodiment, in combination with the above-mentioned embodiment of the first discharging switch unit T21, the control terminal of the first discharging switch unit T21 is coupled to the first scan line S1, the input terminal is coupled to the driving voltage terminal Vdd, and the output terminal is coupled to a ground terminal, so that when discharging, the first discharging switch unit T21 and the second switch unit T12 of this embodiment together form a "discharging module", at this time, in the second stage, the voltage of the second terminal B of the compensation capacitor unit C drops to Vth, and at this time, the first discharging module is disconnected from the first terminal a of the compensation capacitor unit C, because the voltage difference of the capacitor voltage does not suddenly change, after the voltage of the second terminal B of the compensation capacitor unit C drops to Vth, the voltage of the first terminal a is originally 2Vth, the voltage of the second terminal B is Vdata, and the drop difference formed by the second terminal B is: Vdata-Vth when the voltage of the first terminal a jumps from 2Vth (threshold voltage Vth of the first discharging switch unit T21 + threshold voltage Vth of the second switch unit T12) to Vdata + Vth, thereby turning on the first switch unit T11 by Vdata + Vth, so that the driving voltage terminal Vdd drives the light emitting device to emit light.
Further, in this embodiment, the pixel driving circuit further includes: a control terminal of the third switching unit is coupled to the fourth scan line S4, an input terminal of the third switching unit is coupled to the data voltage terminal Vdata, and an output terminal of the third switching unit is coupled to the second terminal B of the compensation capacitor unit C. In this embodiment, the third switching unit controls the voltage written at the second end B of the compensation capacitor unit C, so that the voltage at the second end B of the compensation capacitor unit C can be switched to Vdata or reduced to Vth.
In addition, in the embodiment of the present application, the pixel driving circuit further includes: a diode element D1, wherein a cathode of the diode element D1 is coupled to a power source of the driving voltage, and an anode thereof is used as the driving voltage terminal Vdd. The diode element D1 of the present embodiment can prevent the voltage reversal and the current backflow of the second switch unit T12 and the first discharge switch unit T21 in the above embodiments.
In addition, in the above embodiments, the output terminals of the first switch unit T11, the first discharge switch unit T21, and the third discharge switch unit T23 of the present application are all coupled to the ground terminal, and in a preferred embodiment, the ground terminal of the present application is located at the display screen of the display device, and when the ground is disturbed, the disturbance to the above elements is the same, so that peripheral power supply is not required, and compared with other driving compensation circuits, one voltage and one control unit can be reduced, thereby saving energy consumption and cost.
In the embodiment of the present application, the first switch unit T11 is directly connected to the pixel light emitting element OLED, so that there is no other loss, and the driving loss can be greatly reduced.
Further, in the embodiment of the present invention, at a high temperature, since the leakage current of the panel is increased, the current of the panel may flow back to the driving voltage terminal Vdd, and further the current stability provided by the driving voltage terminal Vdd is affected, the diode device D1 of the present invention can prevent the large current at the panel terminal from flowing back to the driving voltage terminal Vdd.
It is obvious to one skilled in the art that "coupling" in the present application may be a direct or indirect electrical connection, for example, a and B are coupled, and then a and B are directly electrically connected, or a and B are electrically connected through C, which is not limited in the present application.
In addition, it can be understood that all the switch units in the present application are thin film transistors in the OLED display device, and the details of the present application are not repeated herein. In addition, in the preferred embodiment of the present application, all the thin film transistors are formed by the same process, so that the threshold voltage of each thin film transistor can be regarded as Vth, and the threshold voltage error between each two thin film transistors is small and can be ignored.
The current formula through an organic light emitting diode OLED is further known as:
I＝1/2Cox(μW/L)(Vgs－Vth)2
i is the current of the organic light emitting diode OLED, μ is the carrier mobility of the driving thin film transistor, W and L are the width and length of the channel of the driving thin film transistor, Vgs is the voltage between the gate and the source of the driving thin film transistor, Vth is the threshold voltage of the driving thin film transistor, and 1/2Cox (μ W/L) is defined as K in the present application, that is, K is the structural parameter of the thin film transistor. The working current of the pixel point is as follows:
Ioled＝K(VGS-Vth)2
＝K(Vth+Vdata-Voled-Vth)2
＝K(Vdata-Voled)2
voled is the anode voltage of the OLED when the pixel emits light, Ioled is the current of the OLED, and it can be seen from the formula that the current passing through the light emitting pixel is related to Vdata and Voled only, and is not related to the first and second switch units T11 and T12, so the current I flowing through the organic light emitting diode OLED is related to the threshold voltage Vth of the first and second switch units T11 and T12, and the threshold voltage Vth of the organic light emitting diode OLED_OLEDThe compensation function is realized regardless of the power supply negative voltage VSS, the threshold voltage variation of the first switch unit T11 and the organic light emitting diode OLED can be effectively compensated, the display brightness of the AMOLED is uniform, and the display quality is improved.
It can be seen that this application discharges compensation capacitor unit C in different stages through two modules of discharging, and then is compensation capacitor unit C at each stage and provides the passageway of bleeding, can eliminate the parasitic charge in the circuit, and this application is under the prerequisite that can carry out pixel drive compensation, and the parasitic charge that whole circuit produced in the operation process is eliminated to parasitic charge has been avoided the influence of parasitic charge to OLED drive.
Example 2
As shown in fig. 5, a display device 20 in the embodiment of the present application includes a display panel including a plurality of pixel units, each including a plurality of light emitting devices 23, and a pixel driving circuit 22 in embodiment 1, wherein each light emitting device is coupled to an output terminal of the first switching unit T11 of the pixel driving circuit in embodiment 1 of the present application through a wire 21.
In specific implementation, the display device provided in the embodiment of the present invention may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator.
It can be understood that display device in this application discharges compensation capacitance unit C in different stages through two modules of discharging, and then is compensation capacitance unit C at each stage and provides the passageway of bleeding, can eliminate the parasitic charge in the circuit, and this application is under the prerequisite that can carry out pixel drive compensation, eliminates the parasitic charge that whole circuit produced at the operation in-process high-efficiently to the influence of parasitic charge to OLED driven has been avoided.
Example 3
An embodiment of the present application further provides a driving method of a display device, where the driving method is performed by using the pixel driving circuit in embodiment 1, and the driving method specifically includes:
s1: writing a driving voltage into a first end A of the compensation capacitor unit C, and writing a data voltage into a second end B;
s2: in the first stage, the driving voltage written in the first end A of the compensation capacitor unit C is reduced to a first set threshold value;
s3: in the second stage, the data voltage written in the second end B of the compensation capacitor unit C is reduced to a second set threshold, and the first discharging module and the first end a of the compensation capacitor unit C are disconnected, so that the voltage of the first end a of the compensation capacitor unit C jumps to a target voltage, wherein the target voltage is greater than the threshold voltage of the first switch unit T11;
s4: the second discharging module is turned off, and the first switching unit T11 is controlled to be turned on by the target voltage of the first terminal a of the compensation capacitor unit C, so as to drive the light emitting device to emit light by the driving voltage.
The above steps of the present application will be described in detail with reference to the embodiments of fig. 1 and 2.
Fig. 3 is a timing diagram corresponding to the embodiment of fig. 2, and as shown in fig. 3, the whole process is divided into four intervals:
stage 1: the third and second switching units T12 are turned on, and the third discharge switching unit T23, the first discharge switching unit T21 and the first switching unit T11 are turned off, at this time, the second terminal B of the compensation capacitor unit C is charged to Vdata, and the first terminal a is charged to Vdd.
Stage 2 (corresponding to the first stage in example 1): the second switching unit T12 and the first discharging switching unit T21 are turned on, and the third switching unit T23 and the first switching unit T11 are turned off, at which time the first terminal a of the compensation capacitance unit C is discharged to 2 Vth.
Stage 3 (corresponding to the second stage in example 1): when the third discharging switch unit T23 is turned on, and the third, second, first and first discharging switch units T12, T21 and T11 are turned off, the voltage of the second terminal B of the compensation capacitor unit C jumps from Vdata to Vth, and the voltage of the first terminal a of the compensation capacitor unit C jumps from Vdata to Vdata + Vth.
And (4) stage: the third switch unit, the third discharging switch unit T23, the second switch unit T12 and the first discharging switch unit T21 are turned off, since the voltage at the first end a of the compensation capacitor unit C is Vdata + Vth greater than Vth, the first switch unit T11 is turned on, and the input end of the first switch unit T11 is coupled to the driving voltage end Vdd, so that the pixel light emitting element OLED emits light by passing current.
Fig. 4 is a timing diagram corresponding to the embodiment of fig. 2, and as shown in fig. 4, the whole process is divided into four intervals:
stage 1: when the third and second switching units T12 are turned on and the third, first and second discharging switching units T23, T21, T11 and T22 are turned off, the second terminal B of the compensation capacitor unit C is charged to Vdata, and the first terminal a is charged to Vdd.
Stage 2 (corresponding to the first stage in example 1): the second and first discharging switch units T22 and T21 are turned on, and the third, third and first discharging switch units T23 and T11 are turned off, at which time the first terminal a of the compensation capacitor unit C is discharged to 2 Vth.
Stage 3 (corresponding to the second stage in example 1): when the third discharging switch unit T23 is turned on, and the third, second, first, second and first discharging switch units T12, T21, T22 and T11 are turned off, the voltage of the second end B of the compensation capacitor unit C jumps from Vdata to Vth, and the voltage of the first end a of the compensation capacitor unit C jumps from Vdata to Vdata + Vth.
And (4) stage: the third switch unit, the third discharging switch unit T23, the second switch unit T12, the second discharging switch unit T22 and the first discharging switch unit T21 are turned off, since the voltage of the first end a of the compensation capacitor unit C is Vdata + Vth greater than Vth, the first switch unit T11 is turned on, and the input end of the first switch unit T11 is coupled to the driving voltage terminal Vdd, so that the pixel light emitting element OLED emits light by passing current.
It can be seen from the above solutions that, in the driving method provided in the embodiment of the present application, when the light emitting diode OLED is driven, the current passing through the light emitting diode OLED is unrelated to the negative electrode of the power supply and the threshold voltage of each thin film transistor, so that the display is uniform, in addition, through the timing control of the above circuit, the compensation capacitor unit C is discharged through the two discharging modules at different stages, and then a bleed channel is provided for the compensation capacitor unit C at each stage, so as to eliminate the parasitic charges in the circuit.
It should be noted that, the driving circuit embodiment, the display device embodiment, and the driving method and the debugging method thereof provided in the embodiment of the present invention may all be mutually referred to, and the embodiment of the present invention does not limit this. The steps of the method for manufacturing a display panel according to the embodiments of the present invention can be increased or decreased according to the circumstances, and any method that can be easily conceived by a person skilled in the art within the technical scope of the present disclosure is covered by the protection scope of the present disclosure, and therefore, the details are not repeated.
The above description is intended only to illustrate the alternative embodiments of the present application, and should not be construed as limiting the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A pixel driving circuit, comprising:
the first end of the compensation capacitor unit is coupled with the driving voltage end, and the second end of the compensation capacitor unit is coupled with the data voltage end;
the control end of the first switch unit is coupled with the first end of the compensation capacitor unit, the input end of the first switch unit is coupled with the driving voltage end, and the output end of the first switch unit is coupled with a light-emitting device;
the first discharging module is used for reducing the driving voltage written in the first end of the compensation capacitor unit to a first set threshold value in a first stage; and
the second discharging module is used for reducing the data voltage written in the second end of the compensation capacitor unit to a second set threshold value in a second stage;
in the second stage, the first discharging module is disconnected from the first end of the compensation capacitor unit, so that the voltage of the first end of the compensation capacitor unit jumps to a target voltage, and the target voltage is greater than the threshold voltage of the first switch unit.
2. The pixel driving circuit according to claim 1, wherein the first discharging module comprises: and the control end of the first discharge switch unit is coupled with the first scanning line, the input end of the first discharge switch unit is coupled with the driving voltage end, and the output end of the first discharge switch unit is coupled with a grounding end.
3. The pixel driving circuit according to claim 1, wherein the first discharging module comprises: and the control end of the first discharge switch unit is coupled with the first scanning line, the input end of the first discharge switch unit is coupled between the first end of the compensation capacitor unit and the control end of the first switch unit, and the output end of the first discharge switch unit is coupled with a grounding end.
4. The pixel driving circuit according to claim 3, wherein the first discharging module further comprises: and a control terminal of the second discharge switch unit is coupled to the first scan line, and an input terminal and an output terminal of the second discharge switch unit are coupled between the first switch unit and the ground terminal.
5. The pixel driving circuit according to claim 1, wherein the second discharging module comprises:
and a control end of the third discharge switch unit is coupled to the second scanning line, and an input end of the third discharge switch unit is coupled between the second end of the compensation capacitor unit and the data voltage end.
6. The pixel driving circuit according to any one of claims 1 to 5, further comprising:
and the control end of the second switch unit is coupled with the third scanning line, the input end of the second switch unit is coupled with the driving voltage end, and the output end of the second switch unit is coupled between the first end of the compensation capacitor unit and the control end of the first switch unit.
7. The pixel driving circuit according to any one of claims 1 to 5, further comprising:
and a control end of the third switching unit is coupled to the fourth scanning line, an input end of the third switching unit is coupled to the data voltage end, and an output end of the third switching unit is coupled to the second end of the compensation capacitor unit.
8. The pixel driving circuit according to any one of claims 1 to 5, further comprising: and the cathode of the diode element is coupled with a power supply of the driving voltage, and the anode of the diode element is used as the driving voltage end.
9. A pixel driving method applied to the pixel driving circuit according to any one of claims 1 to 8, comprising:
writing a driving voltage into a first end of the compensation capacitor unit, and writing a data voltage into a second end of the compensation capacitor unit;
in the first stage, the driving voltage written in the first end of the compensation capacitor unit is reduced to a first set threshold value;
in a second stage, the data voltage written in the second end of the compensation capacitor unit is reduced to a second set threshold value, and the first discharging module and the first end of the compensation capacitor unit are disconnected, so that the voltage of the first end of the compensation capacitor unit jumps to a target voltage, wherein the target voltage is greater than the threshold voltage of the first switch unit;
and the second discharging module is switched off, and the first switching unit is controlled to be switched on by the target voltage at the first end of the compensation capacitor unit so as to drive the light-emitting device to emit light by the driving voltage.
10. A display panel comprising the pixel driving circuit according to any one of claims 1 to 8.
CN202210453420.XA 2022-04-27 2022-04-27 Pixel driving circuit, driving method and display device Pending CN114639347A (en)

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