CN112397031B - Pixel driving circuit and display panel - Google Patents
Pixel driving circuit and display panel Download PDFInfo
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- CN112397031B CN112397031B CN202011279449.8A CN202011279449A CN112397031B CN 112397031 B CN112397031 B CN 112397031B CN 202011279449 A CN202011279449 A CN 202011279449A CN 112397031 B CN112397031 B CN 112397031B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
Abstract
The application provides a pixel driving circuit and a display panel, which comprise a preprocessing module, a data module, a modulation module, a reset module, a data writing module, a compensation module, a storage module, a light-emitting control module and a light-emitting module, wherein the data writing module controls whether the data module writes data voltage into the light-emitting control module or not; the light-emitting control module is controlled by the light-emitting control module to emit light, the reset module controls the preprocessing module to write initial voltage into the light-emitting control module and the light-emitting module, the storage module stores storage voltage and provides the storage voltage for the light-emitting control module, the compensation module controls the light-emitting control module to write the storage voltage into the storage module, the light-emitting control module comprises a first control end and a second control end connected to the modulation module, and the modulation module adjusts the threshold voltage of the light-emitting control module so that the threshold voltage is in a preset voltage range; the scheme can improve the stability of the threshold voltage so as to improve the reliability of the image display of the OLED display.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a pixel driving circuit and a display panel.
Background
An OLED (Organic Light Emitting Diode) display device has the advantages of Light weight, thin thickness, flexibility, wide viewing angle range, and the like.
In the pixel driving circuit of the existing OLED display, the thin film transistor is used to control the current passing through the OLED to control the light emitting condition of the OLED, so the stability of the threshold voltage of the thin film transistor is very important. However, when the OLED display displays the same picture for a long time, some carriers accumulate at the bottom of the channel of the thin film transistor for a long time and cannot be recovered, which causes the threshold voltage of the thin film transistor to shift, affects the magnitude of the current passing through the OLED, and reduces the reliability of the subsequent picture display, and such a picture related to the previous display picture often appears as an afterimage phenomenon.
Therefore, it is necessary to provide a pixel driving circuit and a display panel that can improve the reliability of the screen display of the OLED display to weaken the afterimage phenomenon.
Disclosure of Invention
The embodiment of the application provides a pixel driving circuit and a display panel, wherein a second control terminal is arranged in a light-emitting control module and is connected to a modulation module, and the modulation module is used for inputting modulation voltage to the light-emitting control module so as to adjust the threshold voltage of the light-emitting control module, so that the threshold voltage is in a preset voltage range; the problem that the reliability of subsequent picture display is low due to the threshold voltage drift of a driving thin film transistor in a pixel driving circuit of the conventional display panel, so that an afterimage phenomenon occurs is solved.
The embodiment of the application provides a pixel driving circuit, which comprises a preprocessing module, a data module, a modulation module, a reset module, a data writing module, a compensation module, a storage module, a light emitting control module and a light emitting module;
the light-emitting control module comprises a first control end, a first input end, a transmission end and a first output end;
the data writing module comprises a second input end and a second output end, the second input end of the data writing module is connected with the data module, the second output end of the data writing module is connected with the first input end of the light-emitting control module, the data writing module is used for controlling whether the data module writes data voltage into the light-emitting control module or not, and the data voltage is used for controlling the voltage of the first control end of the light-emitting control module;
the light emitting module comprises a first end, the first end of the light emitting module is connected with the first output end of the light emitting control module, and the light emitting module is used for emitting light under the control of the light emitting control module;
the reset module comprises a third input end, a third output end and a fourth output end, the third input end of the reset module is connected with the preprocessing module, the third output end of the reset module is connected with the first control end of the light-emitting control module, the fourth output end of the reset module is connected with the first end of the light-emitting module, the reset module is used for controlling whether the preprocessing module writes initial voltage into the light-emitting control module and the light-emitting module, and the initial voltage is used for initializing the light-emitting control module and the light-emitting module;
the storage module comprises a second end, the second end of the storage module is connected with the first control end of the light-emitting control module, and the storage module is used for storing storage voltage and providing the storage voltage for the light-emitting control module;
the compensation module comprises a third end and a fourth end, the third end of the compensation module is connected with the transmission end of the light-emitting control module, the fourth end of the compensation module is connected with the second end of the storage module, and the compensation module is used for controlling whether the light-emitting control module writes the storage voltage into the storage module or not;
the light-emitting control module further comprises a second control end, the second control end of the light-emitting control module is connected with the modulation module, the modulation module is used for inputting modulation voltage to the light-emitting control module, the modulation voltage is used for adjusting the threshold voltage of the light-emitting control module, and the threshold voltage of the light-emitting control module is in a preset voltage range, wherein the threshold voltage of the light-emitting control module enables the light-emitting control module to be in a critical conduction state.
In one embodiment, the lighting control module includes:
the driving transistor comprises a first grid, a first source drain and a second grid, the first source drain and the second grid are arranged in a stacked mode, the first grid is connected with a first control end of the light-emitting control module, the first grid and the first source drain are used for controlling the working voltage of the driving transistor, the second grid is connected with a second control end of the light-emitting control module, the second grid is used for controlling the threshold voltage of the driving transistor, the threshold voltage of the driving transistor is the threshold voltage of the light-emitting control module, and the difference value of the working voltage of the driving transistor and the threshold voltage of the driving transistor is used for controlling the conduction state of the driving transistor.
In one embodiment, the driving transistor further includes:
the first insulating part is arranged between the first grid and the first source drain electrode and is used for insulating the first grid and the first source drain electrode;
and the second insulating part is arranged between the second grid electrode and the first source drain electrode and is used for insulating the second grid electrode and the first source drain electrode.
In an embodiment, the first source and drain include a first source and a first drain, the first source is connected to the first input end of the light emission control module, and the first drain is connected to the transmission end of the light emission control module.
In an embodiment, the modulation module is connected to the transmission terminal of the light emission control module, and the modulation module is configured to transmit the voltage at the transmission terminal J of the light emission control module to the second control terminal of the light emission control module.
In an embodiment, the modulation module is connected to a first control terminal of the light emission control module, and the modulation module is configured to transmit a voltage of the first control terminal of the light emission control module to a second control terminal of the light emission control module.
In an embodiment, the modulation module is connected to a first input terminal of the light emission control module, and the modulation module is configured to transmit a voltage at the input terminal of the light emission control module to a second control terminal of the light emission control module.
In an embodiment, the pixel driving circuit further includes a first power module, the light emission control module further includes a power terminal connected to the first power module, the first power module inputs a first voltage to the light emission control module, and the light emission control module further includes:
the first transistor comprises a fourth input end and a fifth output end, the fourth input end is connected with the power supply end of the light-emitting control module, the fifth output end is connected with the first source electrode of the driving transistor, and the first transistor is used for controlling whether the first power supply module writes the first voltage into the first source electrode of the driving transistor or not;
and the second transistor comprises a fifth input end and a sixth output end, the fifth input end is connected with the first drain electrode of the driving transistor, the sixth output end is connected with the output end of the light-emitting control module, and the second transistor is used for controlling whether to transmit the current of the first drain electrode to the light-emitting module.
In one embodiment, the reset module includes:
a third transistor, wherein the third transistor includes a sixth input terminal and a seventh output terminal, the sixth input terminal is connected to the input terminal of the reset module, and the seventh output terminal is connected to the third output terminal of the reset module to connect to the second terminal of the memory module;
the third transistor comprises two third sub-transistors, each of the two third sub-transistors comprises a grid electrode and a source drain electrode, the two grid electrodes of the two third sub-transistors are connected, and the two source drain electrodes of the two third sub-transistors are connected in series.
Embodiments of the present application also provide a display panel including the pixel driving circuit as described in any one of the above.
The application provides a pixel driving circuit and a display panel, which comprises a preprocessing module, a data module, a modulation module, a reset module, a data writing module, a compensation module, a storage module, a light-emitting control module and a light-emitting module, wherein the light-emitting control module is internally provided with a second control end and is connected with the second control end to the modulation module, the modulation module is used for inputting modulation voltage to the light-emitting control module so as to adjust the threshold voltage of the light-emitting control module, so that the threshold voltage is in a preset voltage range, and the threshold voltage of the light-emitting control module enables the light-emitting control module to be in a critical conduction state; therefore, the threshold voltage of the light-emitting control module in the scheme can be within the preset voltage range under the adjustment of the modulation module, so that the threshold voltage is prevented from drifting greatly due to external reasons, the stability of the threshold voltage of the light-emitting control module is improved, and the reliability of subsequent picture display is improved.
Drawings
The present application is further illustrated by the following figures. It should be noted that the drawings in the following description are only for illustrating some embodiments of the present application, and that other drawings may be obtained by those skilled in the art without inventive effort.
Fig. 1 is a block diagram of a pixel driving circuit according to an embodiment of the present disclosure;
fig. 2 is an internal structure diagram of a light emission control module according to an embodiment of the present application;
fig. 3 is a schematic cross-sectional view of a driving transistor provided in an embodiment of the present application;
fig. 4 is a block diagram of another pixel driving circuit according to an embodiment of the present disclosure;
fig. 5 is a block diagram of a pixel driving circuit according to another embodiment of the present disclosure;
fig. 6 is a block diagram of a pixel driving circuit according to another embodiment of the present disclosure;
fig. 7 is a circuit diagram of a pixel driving circuit according to an embodiment of the present application;
fig. 8 is a timing diagram of a pixel driving circuit according to an embodiment of the present application.
Detailed Description
The technical solution in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second", "third" and "fourth", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to the listed steps or modules but may alternatively include other steps or modules not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Embodiments of the present application provide pixel driving circuits including, but not limited to, the following embodiments and combinations of the following embodiments.
In one embodiment, as shown in fig. 1, the pixel driving circuit 00 includes a preprocessing module 10, a data module 20, a modulation module 30, a reset module 40, a data writing module 50, a compensation module 60, a storage module 70, a light emitting control module 80, and a light emitting module 90; the light emitting control module 80 comprises a first control end G, a first input end I, a conveying end J and a first output end K; the data writing module 50 includes a second input end N and a second output end O, the second input end N of the data writing module 50 is connected to the data module 20, the second output end O of the data writing module 50 is connected to the first input end I of the light emission control module 80, the data writing module 50 is configured to control whether the data module 20 writes a data voltage into the light emission control module 80, and the data voltage is used to control a voltage magnitude of the first control end G of the light emission control module 80; the light emitting module 90 includes a first end L, the first end L of the light emitting module 90 is connected to the first output end K of the light emitting control module 80, and the light emitting module 90 is configured to emit light under the control of the light emitting control module 80; the reset module 40 includes a third input end a, a third output end B and a fourth output end C, the third input end a of the reset module 40 is connected to the preprocessing module 10, the third output end B of the reset module 40 is connected to the first control end G of the light emitting control module 80, the fourth output end C of the reset module is connected to the first end L of the light emitting module 90, the reset module 40 is configured to control whether the preprocessing module 10 writes an initial voltage into the light emitting control module 80 and the light emitting module 90, and the initial voltage is used to initialize the light emitting control module 80 and the light emitting module 90; the memory module 70 includes a second terminal F, the second terminal F of the memory module 70 is connected to the first control terminal G of the light emission control module 80, and the memory module 70 is configured to store a storage voltage and provide the storage voltage to the light emission control module 80; the compensation module 60 includes a third terminal E and a fourth terminal D, the third terminal E of the compensation module 60 is connected to the transmission terminal J of the light emission control module 80, the fourth terminal D of the compensation module 60 is connected to the second terminal F of the storage module 70, and the compensation module 60 is configured to control whether the light emission control module 80 writes the storage voltage into the storage module 70.
The light emitting control module 80 further includes a second control end Q, the second control end Q of the light emitting control module 80 is connected to the modulation module 30, the modulation module 30 is configured to input a modulation voltage to the light emitting control module 80, the modulation voltage is configured to adjust a threshold voltage of the light emitting control module 80, and enable the threshold voltage of the light emitting control module 80 to be within a preset voltage range, where the threshold voltage of the light emitting control module 80 enables the light emitting control module 80 to be in a critical conduction state.
It can be understood that when the values of the data voltages written by the data module 20 in the pixel driving circuit 00 to the light-emitting control module 80 for a plurality of times in succession in a period of time are all the same, the threshold voltage of the light-emitting control module 80 may be shifted, and the light-emitting condition of the light-emitting module 90 may be affected. However, in the present embodiment, by configuring the light emission control module 80 to further include the second control terminal Q and connecting the second control terminal Q to the modulation module 30, the modulation module 30 inputs a modulation voltage to the light emission control module 80 to control the voltage of the second control terminal Q, and the light emission control module 80 has a property that "the threshold voltage of the light emission control module 80 and the voltage of the second control terminal Q are in a negative correlation or a positive correlation", so that the value of the modulation voltage can be reasonably set in the present embodiment to control the voltage of the second control terminal Q such that the threshold voltage of the light emission control module 80 is within a preset voltage range, that is, the stability of the threshold voltage of the light emission control module 80 is improved, such that the data voltage acts on the light emission control module 80, the lighting condition of the lighting module 90 is more accurate.
In one embodiment, as shown in fig. 2, the light emitting control module 80 includes: the driving transistor comprises a first grid 801, a first source drain 802 and a second grid 803, wherein the first grid 801, the first source drain 802 and the second grid 803 are arranged in a stacked mode, the first grid 801 is connected with a first control end G of the light emission control module 80, the first grid 801 and the first source drain 802 are used for controlling the working voltage of the driving transistor, the second grid 803 is connected with a second control end Q of the light emission control module 80, the second grid 803 is used for controlling the threshold voltage of the driving transistor, the threshold voltage of the driving transistor is the threshold voltage of the light emission control module 80, and the difference value of the working voltage of the driving transistor and the threshold voltage of the driving transistor is used for controlling the conduction state of the driving transistor.
Here, the threshold voltage of the light emission control module 80 may be understood as the threshold voltage of the driving transistor. When the driving transistor may be a P-type vertical double gate transistor, the first gate 801 may be a top gate of the driving transistor, and the second gate 803 may be a bottom gate of the driving transistor, and since the threshold voltage of the driving transistor and the top gate of the driving transistor are positively correlated and the threshold voltage of the driving transistor and the bottom gate of the driving transistor are negatively correlated, the modulation module 30 may be connected to the top gate or the bottom gate of the driving transistor to adjust the threshold voltage of the driving transistor.
Specifically, the modulation module 30 is connected to the bottom gate of the driving transistor, that is, the modulation module 30 is connected to the second gate 803. At this time, the conduction condition of the driving transistor can be controlled by controlling the voltage of the top gate of the driving transistor and the voltage of the first source drain 80, because the driving transistor is a P-type vertical double-gate transistor, the threshold voltage of the driving transistor is a negative value, and when the voltage of the top gate of the driving transistor is a smaller negative value or the working voltage is less than the threshold voltage of the driving transistor, the driving transistor is turned on, wherein the working voltage is the difference between the voltage of the first gate 801 and the voltage of the first source drain 802.
It is understood that the driving transistor may also be a transistor with an N-type vertical double-gate structure, and in this case, the top gate or the bottom gate of the driving transistor may also be selected to be connected to the modulation module 30 according to the drift of the threshold voltage of the driving transistor, so as to stabilize the threshold voltage of the driving transistor within the preset voltage range.
In one embodiment, as shown in fig. 3, the driving transistor further includes: a first insulating portion 804, where the first insulating portion 804 is disposed between the first gate 801 and the first source/drain 802, and the first insulating portion 804 is used for insulating the first gate 801 and the first source/drain 802; a second insulating portion 805, where the second insulating portion 805 is disposed between the second gate 803 and the first source/drain 802, and the second insulating portion 805 is used to insulate the second gate 803 from the first source/drain 802.
It can be understood that the first gate 801, the second gate 803, and the first source drain 802 are all made of conductive materials, and the first insulating portion 804 and the second insulating portion 805 are all made of insulating materials, so that the first gate 801, the second gate 803, and the first source drain 802 are insulated from each other, and signal interference is avoided. The first gate 801, the second gate 803, and the first source drain 802 may all be made of a metal material, and further, a constituent material of the first gate 801 may be the same as a constituent material of the second gate 803. The first insulating portion 804 and the second insulating portion 805 may be made of at least one of silicon nitride and silicon oxide, and further, the first insulating portion 804 and the second insulating portion 805 may have the same structure, for example, the first insulating portion 804 and the second insulating portion 805 may each include a silicon nitride layer and a silicon oxide layer stacked together.
In one embodiment, as shown in fig. 2 to 3, the first source/drain 802 includes a first source 806 and a first drain 807, the first source 806 is connected to the first input terminal I of the light emission control module 80, and the first drain 807 is connected to the delivery terminal J of the light emission control module 80.
Specifically, as shown in fig. 3, the driving transistor further includes a first active portion 808, the first active portion 808 is disposed between the first source 806 and the first drain 807, and left and right ends of the first active portion 808 are electrically connected to the first source 806 and the first drain 807 respectively, where the left and right ends of the first active portion 808 are disposed in contact with the first source 806 and the first drain 807 respectively, the first active portion 808 may be made of a semiconductor material and a dopant, the first active portion 808 includes a channel region and doped regions disposed at two ends of the channel region, and the doped regions disposed at two ends of the channel region are disposed in contact with the first source 806 and the first drain 807 respectively; and the substrate 809 is arranged on the side of the second gate 803 far away from the second insulating part 805, and the substrate 809 is used for bearing the second gate 803 and the second insulating part 805.
It is understood that, since the driving transistor is a P-type vertical double-gate transistor, the driving transistor is turned on when the operating voltage is less than the threshold voltage of the driving transistor, wherein the operating voltage is the difference between the voltage of the first gate 801 and the voltage of the first source 806, that is, the voltage of the first gate 801 is sufficiently less than the voltage of the first source 806.
In an embodiment, as shown in fig. 4, the modulation module 30 is connected to the transmission terminal J of the light emission control module 80, and the modulation module 30 is configured to transmit the voltage of the transmission terminal J of the light emission control module 80 to the second control terminal Q of the light emission control module 30.
It can be understood that, at this time, the voltage of the second control terminal Q of the light emission control module 30 changes following the change of the voltage of the transmission terminal J of the light emission control module 80, that is, the voltage of the second gate 803 of the driving transistor is controlled by the voltage of the first drain 807 of the driving transistor.
In an embodiment, as shown in fig. 5, the modulation module 30 is connected to the first control terminal G of the light emission control module 80, and the modulation module 30 is configured to transmit the voltage of the first control terminal G of the light emission control module 80 to the second control terminal Q of the light emission control module 30.
It can be understood that, at this time, the voltage of the second control terminal Q of the light emission control module 30 changes following the change of the voltage of the first control terminal G of the light emission control module 80, that is, the voltage of the second gate 803 of the driving transistor is controlled by the voltage of the first gate 801 of the driving transistor.
In an embodiment, as shown in fig. 6, the modulation module 30 is connected to a first input terminal I of the light emitting control module 80, and the modulation module 30 is configured to transmit a voltage at the input terminal I of the light emitting control module 80 to a second control terminal Q of the light emitting control module 80.
It can be understood that, at this time, the voltage of the second control terminal Q of the light emission control module 30 changes following the change of the voltage of the first input terminal I of the light emission control module 80, that is, the voltage of the second gate 803 of the driving transistor is controlled by the voltage of the first source 806 of the driving transistor.
In an embodiment, as shown in fig. 7, the pixel driving circuit 00 further includes a first power module 100, the light emission control module 80 further includes a power terminal H, the power terminal H is connected to the first power module 100, the first power module 100 inputs a first voltage to the light emission control module 80, and the light emission control module 80 further includes: a first transistor, including a fourth input 811 and a fifth output 812, where the fourth input 811 is connected to the power terminal H of the lighting control module 80, the fifth output 812 is connected to the first source 806 of the driving transistor, and the first transistor is used to control whether the first power module 100 writes the first voltage into the first source 806 of the driving transistor; and a second transistor including a fifth input terminal 821 and a sixth output terminal 822, wherein the fifth input terminal 821 is connected to the first drain 807 of the driving transistor, the sixth output terminal 822 is connected to the output terminal K of the light emission control module 80, and the second transistor is used for controlling whether to transmit the current of the first drain 807 to the light emission module 90.
The first voltage output by the first power module 100 is a constant high voltage.
Further, as shown in fig. 7, the pixel driving circuit 00 further includes a second power module 101, the light emitting module 90 further includes a fifth terminal M, the fifth terminal M is connected to the second power module 101, the second power module 101 provides a second voltage to the light emitting module 90, the light emitting module 90 includes an OLED device 900, an anode terminal and a cathode terminal of the OLED device 900 are respectively connected to the first terminal L and the fifth terminal M of the light emitting module 90, wherein the second voltage output by the second power module 101 is a constant low voltage or a constant ground voltage, and provides a working circuit for the OLED device 900.
Further, as shown in fig. 7, the memory module 70 further includes a sixth terminal P, where the sixth terminal P is connected to the first power module 100, and the first power module 100 inputs the first voltage to the memory module 70. Specifically, the memory module 70 may include a capacitor 700, two ends of the capacitor 700 are respectively connected to the first terminal F and the sixth terminal P of the memory module 70, and the capacitor 700 is charged and discharged under the control of the first voltage and the voltage of the first control terminal G.
In one embodiment, as shown in fig. 7, the reset module 40 includes: a third transistor, which includes a sixth input terminal 401 and a seventh output terminal 402, wherein the sixth input terminal 401 is connected to the input terminal a of the reset module 40, and the seventh output terminal 402 is connected to the third output terminal B of the reset module 40 to connect to the second terminal F of the memory module 70; the third transistor includes two third sub-transistors 403, each of the two third sub-transistors 403 includes a gate 01 and a source/drain 02, the two gates 01 of the two third sub-transistors 403 are connected, and the two source/drain 02 of the two third sub-transistors 403 are connected in series.
Specifically, a source of one of the third sub-transistors 403 and a drain of the other third sub-transistor 403 are connected, and the drain of the former and the source of the latter may be respectively connected to the sixth input terminal 401 and the seventh output terminal 402. It can be understood that the seventh output terminal 402 is connected to one end of the capacitor 700, and due to the characteristics of the capacitor 700, a leakage current may be generated by a current passing through the third transistor and flows into the light emitting module 90 through the third transistor, which affects the accuracy of light emission.
Further, as shown in fig. 7, the reset module 40 further includes a fourth transistor 410, an input end and an output end of the fourth transistor 410 are respectively connected to the input end a and the fourth output end C of the reset module 40, and the fourth transistor 410 is configured to control whether the preprocessing module 10 writes the initial voltage into the light emitting module 90.
Wherein, the initial voltage output by the preprocessing module 10 is a constant low voltage.
Further, as shown in fig. 7, the compensation module 60 includes a fifth transistor 600, an input terminal of the fifth transistor 600 is connected to the fourth terminal D of the compensation module 60 to connect to the second terminal F of the memory module, and an output terminal of the fifth transistor 600 is connected to the third terminal E of the compensation module 60; wherein the fifth transistor 600 includes two fifth sub-transistors, and the structure and function of the fifth transistor 600 can refer to the related description of the third transistor above.
Further, as shown in fig. 7, the data writing module 50 includes a sixth transistor 500, an input terminal of the sixth transistor 500 is connected to the second input terminal N of the data writing module 50, an output terminal of the sixth transistor 500 is connected to the second output terminal O of the data writing module 50, and the sixth transistor 500 is configured to control whether the data module 20 writes the data voltage into the light emission control module 80.
In an embodiment, the two gates of the two third sub-transistors 403 and the gate of the fourth transistor 410 are both used for receiving a first scan signal scan1, the gate of the fifth transistor 600 and the gate of the sixth transistor 500 are both used for receiving a second scan signal scan2, the gate of the first transistor and the gate of the second transistor are both used for receiving an enable signal em, the data voltage has a data signal data, when all the transistors in the pixel driving circuit 00 are P-type transistors, the waveforms of the first scan signal scan1, the second scan signal scan2, the enable signal em and the data signal data are shown in fig. 8, wherein the voltage value corresponding to the high voltage of the data signal data is Vdata, here the voltage value defining the threshold voltage of the driving transistor is Vth, the constant high voltage value defining the first voltage is Vdd, the voltage value of the anode terminal when the OLED device is lighted is defined as Vandoe, and the voltage value of the constant low voltage of the initial voltage is defined as Vi. It should be noted that, in the present application, the threshold voltage Vth of the driving transistor is controlled in real time by the modulation module 30, so the threshold voltage Vth of the driving transistor is a time-varying quantity.
The following describes three phases of operation of the pixel driving circuit 00 according to the connection of the modulation module 30 and with reference to fig. 4-8.
In case 1, when the modulation module 30 is connected to the transmission terminal J of the light emission control module 80, as can be seen from fig. 4 and 7-8, the threshold voltage Vth of the driving transistor changes with the change of the voltage of the first drain 807 of the driving transistor, which is specifically analyzed as follows:
in the reset phase t1, the first scan signal scan1 is low and active, the two gates 01 of the two third sub-transistors 403 and the gate of the fourth transistor 410 receive low voltage, the third transistor and the fourth transistor 410 are turned on, so the preprocessing module 10 writes the initial voltage Vi to the light emitting control module 80 and the light emitting module 90 through the third transistor and the fourth transistor 410, respectively, and the initial voltage Vi is a low voltage, at this time, the first gate 801 of the first transistor in the light emission control module 80 receives the initial voltage Vi which is a low voltage, a channel is formed in the driving transistor, when a proper voltage difference is not formed between the anode terminal and the cathode terminal of the OLED device 900 in the light emitting module 90, the OLED device 900 is in an off state, so that the initialization of the light emitting control module 80 and the light emitting module 90 is completed; in this process, the first source 806 and the first drain 807 are floating, the operation state of the driving transistor is unknown, the voltage value of the first drain 807 is unknown, the voltage value of the second gate 803 is unknown, and the threshold voltage Vth of the driving transistor is defined as a first value.
During the compensation and write phase t2, the second scan signal scan2 is low and active, the gates of the sixth transistor 500 and the fifth transistor 600 receive the low voltage, the sixth transistor 500 and the fifth transistor 600 are turned on, so the data module 20 writes the data signal data to the first source 806 of the first transistor through the sixth transistor 500;
since the driving transistor is in a conducting state, and the first drain 807 of the driving transistor is connected to the first gate 801 of the driving transistor through the conducting fifth transistor 600, and the first gate 801 of the driving transistor is also connected to one end of the capacitor 700 through the second end F of the memory module 70, the data signal data charges one end of the capacitor 700 (i.e. the first gate 801 of the first transistor), the voltage of the first gate 801 of the driving transistor gradually rises, and the first drain 807 is written with the data signal data, the voltage of the first drain 807 is Vdata, when the difference between the voltage of the first gate 801 of the driving transistor and the voltage of the first source 806 reaches a threshold voltage, the driving transistor is turned off, and the voltage of the first gate 801 of the driving transistor (i.e. one end of the capacitor 700) stabilizes at the first source 806 and the threshold voltage Vth The sum of the value voltages Vth, (Vdata + Vth); in this process, the voltage of the first drain 807 changes from an unknown voltage value to Vdata, so that the voltage of the second gate 803 also changes from an unknown voltage value to Vdata, and the threshold voltage Vth of the driving transistor is defined as a second value.
In a light emitting period t3, the enable signal em is low and active, the gate of the first transistor and the gate of the second transistor receive low voltage, the first transistor and the second transistor are turned on, so the first voltage Vdd is written into the first source 806 of the driving transistor through the first transistor, since the first voltage Vdd is constant high voltage and is large enough, the difference between the voltage of the first gate 801 and the voltage of the first source 806 of the driving transistor can be smaller than the threshold voltage Vth, so that the driving transistor is turned on, and the current of the first drain 807 is k (Vdata + Vth-Vdd-Vth)2I.e. k x (Vdata-Vdd)2K is a constant coefficient related to the characteristics of the driving transistor;
since the second transistor is turned on, the current of the first drain 807 can be transmitted to the anode terminal of the OLED device 900 through the second transistor, the OLED device 900 is turned on, and the voltage of the first drain 807 is approximately the voltage vando of the anode terminal of the OLED device 900; in this process, the voltage of the first drain 807 changes from Vdata to vando, so the voltage of the second gate 803 also changes from Vdata to vando, and the threshold voltage Vth of the driving transistor is defined as a third value.
In summary, in one duty cycle, the threshold voltage Vth of the driving transistor goes through a process of changing from the first value to the second value, and then changing from the second value to a third value.
In case 2, when the modulation module 30 is connected to the first control terminal G of the light emission control module 80, as can be seen from fig. 5 and 7-8, the threshold voltage Vth of the driving transistor changes with the change of the voltage of the first gate 801 of the driving transistor, which is specifically analyzed as follows:
in the reset phase t1, the first scan signal scan1 is low and active, the two gates 01 of the two third sub-transistors 403 and the gate of the fourth transistor 410 receive low voltage, the third transistor and the fourth transistor 410 are turned on, so the preprocessing module 10 writes the initial voltage Vi to the light emitting control module 80 and the light emitting module 90 through the third transistor and the fourth transistor 410, respectively, and the initial voltage Vi is a low voltage, at this time, the first gate 801 of the first transistor in the light emission control module 80 receives the initial voltage Vi which is a low voltage, a channel is formed in the driving transistor, when a proper voltage difference is not formed between the anode terminal and the cathode terminal of the OLED device 900 in the light emitting module 90, the OLED device 900 is in an off state, so that the initialization of the light emitting control module 80 and the light emitting module 90 is completed; in this process, the first gate 801 is changed from floating to be electrically connected to the preprocessing module 10, the voltage of the first gate 801 is changed from an unknown voltage value to Vi, so the voltage value of the second gate 803 is Vi, and the threshold voltage Vth of the driving transistor is defined as a fourth value.
During the compensation and write phase t2, the second scan signal scan2 is low and active, the gates of the sixth transistor 500 and the fifth transistor 600 receive the low voltage, the sixth transistor 500 and the fifth transistor 600 are turned on, so the data module 20 writes the data signal data to the first source 806 of the first transistor through the sixth transistor 500;
since the driving transistor is in a conducting state, and the first drain 807 of the driving transistor is connected to the first gate 801 of the driving transistor through the conducting fifth transistor 600, and the first gate 801 of the driving transistor is also connected to one end of the capacitor 700 through the second end F of the memory module 70, the data signal data charges one end of the capacitor 700 (i.e. the first gate 801 of the first transistor), the voltage of the first gate 801 of the driving transistor gradually rises, and the first drain 807 is written with the data signal data, the voltage of the first drain 807 is Vdata, when the difference between the voltage of the first gate 801 of the driving transistor and the voltage of the first source 806 reaches a threshold voltage, the driving transistor is turned off, and the voltage of the first gate 801 of the driving transistor (i.e. one end of the capacitor 700) stabilizes at the first source 806 and the threshold voltage Vth The sum of the value voltages Vth, (Vdata + Vth); in this process, the first gate 801 is gradually increased from Vi to (Vdata + Vth), so the voltage of the second gate 803 is also gradually increased from Vi to (Vdata + Vth), and the threshold voltage Vth of the driving transistor is gradually changed from the fourth value to the fifth value.
In a light emitting period t3, the enable signal em is low and active, the gate of the first transistor and the gate of the second transistor receive low voltage, the first transistor and the second transistor are turned on, so the first voltage Vdd is written into the first source 806 of the driving transistor through the first transistor, since the first voltage Vdd is constant high voltage and is large enough, the difference between the voltage of the first gate 801 and the voltage of the first source 806 of the driving transistor can be smaller than the threshold voltage Vth, so that the driving transistor is turned on, and the current of the first drain 807 is k (Vdata + Vth-Vdd-Vth)2I.e. k x (Vdata-Vdd)2K is a constant coefficient related to the characteristics of the driving transistor;
since the second transistor is turned on, the current of the first drain 807 can be transmitted to the anode terminal of the OLED device 900 through the second transistor, the OLED device 900 is turned on, and the voltage of the first drain 807 is approximately the voltage vando of the anode terminal of the OLED device 900; in this process, the first gate 801 is maintained at (Vdata + Vth) by the capacitor 700, so that the voltage of the second gate 803 is also maintained at (Vdata + Vth), and the threshold voltage Vth of the driving transistor is also maintained at the fifth value.
In summary, in one duty cycle, the threshold voltage Vth of the driving transistor goes through a process of gradually changing from the fourth value to the fifth value and then being maintained at the fifth value.
In case 3, when the modulation module 30 is connected to the first input terminal I of the light emission control module 80, as can be seen from fig. 6 to 8, the threshold voltage Vth of the driving transistor changes with the change of the voltage of the first source 806 of the driving transistor, which is specifically analyzed as follows:
in the reset phase t1, the first scan signal scan1 is low and active, the two gates 01 of the two third sub-transistors 403 and the gate of the fourth transistor 410 receive low voltage, the third transistor and the fourth transistor 410 are turned on, so the preprocessing module 10 writes the initial voltage Vi to the light emitting control module 80 and the light emitting module 90 through the third transistor and the fourth transistor 410, respectively, and the initial voltage Vi is a low voltage, at this time, the first gate 801 of the first transistor in the light emission control module 80 receives the initial voltage Vi which is a low voltage, a channel is formed in the driving transistor, when a proper voltage difference is not formed between the anode terminal and the cathode terminal of the OLED device 900 in the light emitting module 90, the OLED device 900 is in an off state, so that the initialization of the light emitting control module 80 and the light emitting module 90 is completed; in this process, the first source 806 and the first drain 807 are floating, the operation state of the driving transistor is unknown, the voltage of the first source 806 is unknown, the voltage of the second gate 803 is unknown, and the threshold voltage Vth of the driving transistor is defined as a sixth value.
During the compensation and write phase t2, the second scan signal scan2 is low and active, the gates of the sixth transistor 500 and the fifth transistor 600 receive the low voltage, the sixth transistor 500 and the fifth transistor 600 are turned on, so the data module 20 writes the data signal data to the first source 806 of the first transistor through the sixth transistor 500;
since the driving transistor is in a conducting state, and the first drain 807 of the driving transistor is connected to the first gate 801 of the driving transistor through the conducting fifth transistor 600, and the first gate 801 of the driving transistor is also connected to one end of the capacitor 700 through the second end F of the memory module 70, the data signal data charges one end of the capacitor 700 (i.e. the first gate 801 of the first transistor), the voltage of the first gate 801 of the driving transistor gradually rises, and the first drain 807 is written with the data signal data, the voltage of the first drain 807 is Vdata, when the difference between the voltage of the first gate 801 of the driving transistor and the voltage of the first source 806 reaches a threshold voltage, the driving transistor is turned off, and the voltage of the first gate 801 of the driving transistor (i.e. one end of the capacitor 700) stabilizes at the first source 806 and the threshold voltage Vth The sum of the value voltages Vth, (Vdata + Vth); in this process, the voltage of the first source 806 is changed from the unknown voltage value to Vdata, so that the voltage of the second gate 803 is also changed from the unknown voltage value to Vdata, and the threshold voltage Vth of the driving transistor is defined to gradually change from the sixth value to the seventh value.
In a light emitting period t3, the enable signal em is low and active, the gate of the first transistor and the gate of the second transistor receive low voltage, the first transistor and the second transistor are turned on, so the first voltage Vdd is written into the first source 806 of the driving transistor through the first transistor, since the first voltage Vdd is constant high voltage and is large enough, the difference between the voltage of the first gate 801 and the voltage of the first source 806 of the driving transistor can be smaller than the threshold voltage Vth, so that the driving transistor is turned on, and the current of the first drain 807 is k (Vdata + Vth-Vdd-Vth)2I.e. k x (Vdata-Vdd)2K is a constant coefficient related to the characteristics of the driving transistor;
since the second transistor is turned on, the current of the first drain 807 can be transmitted to the anode terminal of the OLED device 900 through the second transistor, the OLED device 900 is turned on, and the voltage of the first drain 807 is approximately the voltage vando of the anode terminal of the OLED device 900; in this process, the first source 806 is changed from Vdata to Vdd, so the voltage of the second gate 803 is also changed from Vdata to Vdd, and the threshold voltage Vth of the driving transistor is also changed from the seventh value to the eighth value.
In summary, in one duty cycle, the threshold voltage Vth of the driving transistor goes through a process of gradually changing from the sixth value to the seventh value, and then changing from the seventh value to the eighth value.
In summary, the current flowing into the OLED device 900 in the pixel driving circuit 00 is k (Vdata-Vdd)2Wherein the threshold voltage Vth of the drive transistor is not involved; in all three cases, the threshold voltage Vth of the driving transistor is changed according to the connection mode of the modulation module 30 and is within the preset voltage range. Therefore, in the pixel driving circuit 00 of the present application, the driving transistor is set as a vertical dual-gate transistor, so that the influence of the threshold voltage of the driving transistor on the accuracy of the light-emitting luminance of the OLED device 900 can be substantially eliminated, further, the stress influence of the voltage and the light received by the driving transistor can be reduced, and the connection mode of the modulation module 30 is reasonably set to adjust the threshold voltage Vth of the driving transistor to be within the preset voltage range, thereby further ensuring the stability of the threshold voltage Vth of the driving transistor, and avoiding the negative influence caused by the drift of the threshold voltage Vth of the driving transistor when the circuit has an error.
Embodiments of the present application further provide a display panel including the pixel driving circuit as described in any one of the above.
The application provides a pixel driving circuit and a display panel, which comprises a preprocessing module, a data module, a modulation module, a reset module, a data writing module, a compensation module, a storage module, a light-emitting control module and a light-emitting module, wherein the light-emitting control module is internally provided with a second control end and is connected with the second control end to the modulation module, the modulation module is used for inputting modulation voltage to the light-emitting control module so as to adjust the threshold voltage of the light-emitting control module, so that the threshold voltage is in a preset voltage range, and the threshold voltage of the light-emitting control module enables the light-emitting control module to be in a critical conduction state; therefore, the threshold voltage of the light-emitting control module in the scheme can be within the preset voltage range under the adjustment of the modulation module, so that the threshold voltage is prevented from drifting greatly due to external reasons, the stability of the threshold voltage of the light-emitting control module is improved, and the reliability of subsequent picture display is improved.
Claims (10)
1. A pixel driving circuit is characterized by comprising a preprocessing module, a data module, a modulation module, a reset module, a data writing module, a compensation module, a storage module, a light emitting control module and a light emitting module;
the light-emitting control module comprises a first control end, a first input end, a transmission end and a first output end;
the data writing module comprises a second input end and a second output end, the second input end of the data writing module is connected with the data module, the second output end of the data writing module is connected with the first input end of the light-emitting control module, the data writing module is used for controlling whether the data module writes data voltage into the light-emitting control module or not, and the data voltage is used for controlling the voltage of the first control end of the light-emitting control module;
the light emitting module comprises a first end, the first end of the light emitting module is connected with the first output end of the light emitting control module, and the light emitting module is used for emitting light under the control of the light emitting control module;
the reset module comprises a third input end, a third output end and a fourth output end, the third input end of the reset module is connected with the preprocessing module, the third output end of the reset module is connected with the first control end of the light-emitting control module, the fourth output end of the reset module is connected with the first end of the light-emitting module, the reset module is used for controlling whether the preprocessing module writes initial voltage into the light-emitting control module and the light-emitting module, and the initial voltage is used for initializing the light-emitting control module and the light-emitting module;
the storage module comprises a second end, the second end of the storage module is connected with the first control end of the light-emitting control module, and the storage module is used for storing storage voltage and providing the storage voltage for the light-emitting control module;
the compensation module comprises a third end and a fourth end, the third end of the compensation module is connected with the transmission end of the light-emitting control module, the fourth end of the compensation module is connected with the second end of the storage module, and the compensation module is used for controlling whether the light-emitting control module writes the storage voltage into the storage module or not;
the light-emitting control module further comprises a second control end, the second control end of the light-emitting control module is connected with the modulation module, the modulation module is used for inputting modulation voltage to the light-emitting control module, the modulation voltage is used for adjusting the threshold voltage of the light-emitting control module and enabling the threshold voltage of the light-emitting control module to be in a preset voltage range, the threshold voltage of the light-emitting control module enables the light-emitting control module to be in a critical conduction state, and the voltage of the second control end of the light-emitting control module changes along with the change of any one of the voltage of the transmission end, the voltage of the first control end and the voltage of the first input end of the light-emitting control module.
2. The pixel driving circuit according to claim 1, wherein the light emission control module comprises:
the driving transistor comprises a first grid, a first source drain and a second grid, the first source drain and the second grid are arranged in a stacked mode, the first grid is connected with a first control end of the light-emitting control module, the first grid and the first source drain are used for controlling the working voltage of the driving transistor, the second grid is connected with a second control end of the light-emitting control module, the second grid is used for controlling the threshold voltage of the driving transistor, the threshold voltage of the driving transistor is the threshold voltage of the light-emitting control module, and the difference value of the working voltage of the driving transistor and the threshold voltage of the driving transistor is used for controlling the conduction state of the driving transistor.
3. The pixel driving circuit according to claim 2, wherein the driving transistor further comprises:
the first insulating part is arranged between the first grid and the first source drain electrode and is used for insulating the first grid and the first source drain electrode;
and the second insulating part is arranged between the second grid electrode and the first source drain electrode and is used for insulating the second grid electrode and the first source drain electrode.
4. The pixel driving circuit according to claim 2, wherein the first source/drain includes a first source and a first drain, the first source is connected to the first input terminal of the light emission control module, and the first drain is connected to the transmission terminal of the light emission control module.
5. The pixel driving circuit according to claim 4, wherein the modulation module is connected to the transmission terminal of the light emission control module, and the modulation module is configured to transmit the voltage at the transmission terminal J of the light emission control module to the second control terminal of the light emission control module.
6. The pixel driving circuit according to claim 4, wherein the modulation module is connected to the first control terminal of the light emission control module, and the modulation module is configured to transmit the voltage of the first control terminal of the light emission control module to the second control terminal of the light emission control module.
7. The pixel driving circuit according to claim 4, wherein the modulation module is connected to a first input terminal of the light emission control module, and the modulation module is configured to transmit a voltage at the input terminal of the light emission control module to a second control terminal of the light emission control module.
8. The pixel driving circuit according to claim 4, wherein the pixel driving circuit further comprises a first power module, the light emission control module further comprises a power terminal connected to the first power module, the first power module inputs a first voltage to the light emission control module, and the light emission control module further comprises:
the first transistor comprises a fourth input end and a fifth output end, the fourth input end is connected with the power supply end of the light-emitting control module, the fifth output end is connected with the first source electrode of the driving transistor, and the first transistor is used for controlling whether the first power supply module writes the first voltage into the first source electrode of the driving transistor or not;
and the second transistor comprises a fifth input end and a sixth output end, the fifth input end is connected with the first drain electrode of the driving transistor, the sixth output end is connected with the output end of the light-emitting control module, and the second transistor is used for controlling whether to transmit the current of the first drain electrode to the light-emitting module.
9. The pixel driving circuit according to claim 1, wherein the reset module comprises:
a third transistor, wherein the third transistor includes a sixth input terminal and a seventh output terminal, the sixth input terminal is connected to the input terminal of the reset module, and the seventh output terminal is connected to the third output terminal of the reset module to connect to the second terminal of the memory module;
the third transistor comprises two third sub-transistors, each of the two third sub-transistors comprises a grid electrode and a source drain electrode, the two grid electrodes of the two third sub-transistors are connected, and the two source drain electrodes of the two third sub-transistors are connected in series.
10. A display panel comprising the pixel driving circuit according to any one of claims 1 to 9.
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