CN111179840A - Pixel driving circuit and display device - Google Patents

Pixel driving circuit and display device Download PDF

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Publication number
CN111179840A
CN111179840A CN202010120557.4A CN202010120557A CN111179840A CN 111179840 A CN111179840 A CN 111179840A CN 202010120557 A CN202010120557 A CN 202010120557A CN 111179840 A CN111179840 A CN 111179840A
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China
Prior art keywords
driving
thin film
film transistor
light
voltage
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CN202010120557.4A
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CN111179840B (en
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李威龙
张露
胡思明
韩珍珍
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Kunshan Govisionox Optoelectronics Co Ltd
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Kunshan Govisionox Optoelectronics Co Ltd
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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]

Abstract

The embodiment of the invention provides a pixel driving circuit, a pixel driving method and a display device, and solves the technical problems of abnormal display brightness and low contrast of a high-resolution and large-screen display screen in the prior art. The pixel driving circuit provided by the embodiment of the invention comprises a driving light-emitting module, a light-emitting device, a data storage control module and a driving light-emitting expansion module for providing driving light-emitting expansion voltage for the driving light-emitting module. Before the pixel driving circuit drives the light emitting module to receive the driving voltage, the driving light emitting expansion module writes the driving light emitting expansion voltage into the driving light emitting module, so that the driving light emitting module receives the voltage twice, the writing time of the driving voltage is prolonged, the driving voltage value is improved, and the charging rate in one process is improved. The pixel circuit can correctly display corresponding brightness, the black state is enough black, and the contrast of the display screen is increased.

Description

Pixel driving circuit and display device
Technical Field
The invention relates to the technical field of display, in particular to a pixel driving circuit, a driving method and a display device.
Background
At present, electronic products have higher and higher requirements on the resolution of display screens. The size of the display screen is increased, the resolution is improved, the writing time of the pixel circuit is greatly shortened, the pixel driving voltage is insufficient, the pixel circuit cannot correctly display corresponding brightness, even the problem that the black state is not black enough occurs, and the contrast of the display screen of the electronic product is reduced.
Disclosure of Invention
In view of this, embodiments of the present invention provide a pixel driving circuit, a pixel driving method, and a display device, which solve the technical problems of abnormal display brightness and low contrast of a high-resolution and large-screen display screen in the prior art.
According to an aspect of the present invention, an embodiment of the present invention provides a pixel driving circuit, including: a driving light emitting module, a first end of which receives a power supply voltage; the anode of the light-emitting device is electrically connected with the second end of the driving light-emitting module; the first end of the data storage module is electrically connected with the first end of the driving light-emitting module, and the second end of the data storage module is electrically connected with the third end of the driving light-emitting module; the third end of the data storage control module receives a second scanning control signal, the first end of the data storage control module receives a data signal voltage, and the second end of the data storage control module is respectively and electrically connected with the second end of the data storage module and the third end of the driving light-emitting module; and the driving light-emitting expansion module is used for providing a first driving light-emitting expansion voltage for the driving light-emitting module, and the second end of the driving light-emitting expansion module is respectively and electrically connected with the second end of the data storage control module and the third end of the driving light-emitting module.
In one embodiment, the driving light expansion module includes: a first initialization unit, a first end of which is electrically connected to a second end of the data storage module and a third end of the driving light emitting module, respectively, the second end of which receives an initialization voltage, and the third end of which receives a first scan control signal; and a driving light-emitting expansion unit, wherein a first end of the driving light-emitting expansion unit receives a first driving light-emitting expansion voltage, a second end of the driving light-emitting expansion unit is respectively electrically connected with a second end of the data storage module and a third end of the driving light-emitting module, and the third end of the driving light-emitting expansion unit receives a fourth scanning control signal.
In a preferred embodiment, the voltage value of the first driving light-emitting expansion voltage is equal to the driving voltage value of the pixels on the previous row of the pixels on the current row.
In one embodiment, the driving light expansion module includes: a first end of the second initialization unit is electrically connected with a second end of the data storage module and a third end of the driving light emitting module respectively, the second end of the second initialization unit is electrically connected with the driving voltage extension line, and the third end of the second initialization unit receives a first scanning control signal; and the driving voltage expansion line receives a second driving voltage expansion signal, the second driving voltage expansion signal sequentially has a first voltage amplitude, a second voltage amplitude and a third voltage amplitude, wherein the first voltage amplitude is equal to an initialization voltage, the second voltage amplitude is equal to a second driving light-emitting expansion voltage, the third voltage amplitude is equal to the data signal voltage, and the second driving light-emitting expansion voltage is greater than the initialization voltage and less than the data signal voltage.
In a preferred embodiment, the voltage value of the second driving light-emitting expansion voltage is equal to the driving voltage value of the pixels on the previous row of the pixels on the current row.
In one embodiment, further comprising: a first end of the third initialization unit is electrically connected with the anode of the light emitting device, a second end of the third initialization unit is electrically connected with a second end of the first initialization module and receives the initialization voltage, and a third end of the third initialization unit receives a third scanning control signal.
In one embodiment, further comprising: a third initializing unit, a first end of which is electrically connected to the anode of the light emitting device, a second end of which receives an initializing voltage alone, and a third end of which receives a third scanning control signal. .
In one embodiment, further comprising: the light-emitting control module is connected between the power output end and the anode of the light-emitting device in series, receives a light-emitting control signal, and controls whether the power output end is connected with the anode of the light-emitting device or not according to the light-emitting control signal.
In one embodiment, the driving light emitting module includes a driving transistor, a source of the driving transistor is electrically connected with an output terminal of the power supply; the data storage module comprises a first capacitor, wherein a first end of the first capacitor is electrically connected with an output end of the power supply, and a second end of the first capacitor is electrically connected with a grid electrode of the driving transistor; the data storage control module comprises a second thin film transistor and a third thin film transistor, wherein the grid electrode of the second thin film transistor and the grid electrode of the third thin film transistor receive the second scanning control signal, the source electrode of the second thin film transistor is electrically connected with the output end of the data signal power supply, and the drain electrode of the second thin film transistor is electrically connected with the source electrode of the driving transistor; the source electrode of the third thin film transistor is electrically connected with the second end of the first capacitor and the grid electrode of the driving transistor respectively, and the drain electrode of the third thin film transistor is electrically connected with the drain electrode of the driving transistor; the first initialization unit comprises a fourth thin film transistor, wherein a source electrode of the fourth thin film transistor is respectively connected with the second end of the first capacitor and a grid electrode of the driving transistor, a drain electrode of the fourth thin film transistor is electrically connected with an output end of the initialization power supply, and the grid electrode of the fourth thin film transistor receives the first scanning control signal; the driving light-emitting expansion module comprises an eighth thin film transistor, wherein the source electrode of the eighth thin film transistor is electrically connected with the output end of the data signal power supply so as to receive a first driving light-emitting expansion voltage, the drain electrode of the eighth thin film transistor is connected with the source electrode of the driving transistor, and the grid electrode of the eighth thin film transistor receives the fourth scanning control signal; the third initialization unit comprises a seventh thin film transistor, a source electrode of the seventh thin film transistor is electrically connected with an anode of the light emitting device, a drain electrode of the seventh thin film transistor is electrically connected with a drain electrode of the fourth thin film transistor and is electrically connected with an output end of the initialization power supply, and a grid electrode of the seventh thin film transistor receives the third scanning control signal; the pixel driving circuit further includes: the light-emitting control module is connected between a power output end and the anode of the light-emitting device in series; the light-emitting control module comprises a fifth thin film transistor and a sixth thin film transistor, wherein the grid electrode of the fifth thin film transistor and the grid electrode of the sixth thin film transistor both receive light-emitting control signals, the source electrode of the fifth thin film transistor is electrically connected with the output end of the power supply, the drain electrode of the fifth thin film transistor is electrically connected with the source electrode of the driving transistor, the drain electrode of the sixth thin film transistor is electrically connected with the drain electrode of the driving transistor, and the source electrode of the sixth thin film transistor is electrically connected with the anode of the light-emitting device.
In one embodiment, the driving light emitting module includes a driving transistor, a source of the driving transistor is connected with an output terminal of the power supply; the data storage module comprises a first capacitor, wherein a first end of the first capacitor is connected with an output end of a power supply, and a second end of the first capacitor is connected with a grid electrode of the driving transistor; the data storage control module comprises a second thin film transistor and a third thin film transistor, wherein the grid electrode of the second thin film transistor and the grid electrode of the third thin film transistor receive the second scanning control signal, the source electrode of the second thin film transistor receives the data signal voltage, and the drain electrode of the second thin film transistor is connected with the source electrode of the driving transistor; the source electrode of the third thin film transistor is respectively connected with the second end of the first capacitor and the grid electrode of the driving transistor, and the drain electrode of the third thin film transistor is connected with the drain electrode of the driving transistor; the second initialization unit comprises a fourth thin film transistor, wherein a source electrode of the fourth thin film transistor is respectively connected with the second end of the first capacitor and a grid electrode of the driving transistor, a drain electrode of the fourth thin film transistor is electrically connected with the driving voltage extension line, and the grid electrode of the fourth thin film transistor receives the first scanning control signal; the third initialization unit comprises a seventh thin film transistor, the source electrode of the seventh thin film transistor is electrically connected with the anode of the light-emitting device, the drain electrode of the seventh thin film transistor is separately electrically connected with the output end of the initialization power supply, and the grid electrode of the seventh thin film transistor receives the third scanning control signal; the pixel driving circuit further includes: the light-emitting control module is connected between a power output end and the anode of the light-emitting device in series; the light-emitting control module comprises a fifth thin film transistor and a sixth thin film transistor, wherein the grid electrode of the fifth thin film transistor and the grid electrode of the sixth thin film transistor both receive light-emitting control signals, the source electrode of the fifth thin film transistor is electrically connected with the output end of the power supply, the drain electrode of the fifth thin film transistor is electrically connected with the source electrode of the driving transistor, the drain electrode of the sixth thin film transistor is electrically connected with the drain electrode of the driving transistor, and the source electrode of the sixth thin film transistor is electrically connected with the anode of the light-emitting device.
According to another aspect of the present invention, an embodiment of the present invention provides a driving method of a pixel driving circuit, for driving the pixel driving circuit, the driving method including: before the driving light-emitting module receives the driving voltage, the driving light-emitting expansion voltage sent by the driving light-emitting expansion module is received.
According to still another aspect of the present invention, an embodiment of the present invention provides a display device, which includes a plurality of pixels and a plurality of pixel driving circuits as described above, wherein each of the pixel driving circuits drives each of the pixels to operate. The pixel driving circuit provided by the embodiment of the invention comprises a driving light-emitting module, a light-emitting device, a data storage control module and a driving light-emitting expansion module for providing driving light-emitting expansion voltage for the driving light-emitting module. Before the driving light-emitting module receives the driving voltage, the driving light-emitting expansion module writes the driving light-emitting expansion voltage into the driving light-emitting module, that is, the driving light-emitting module receives the voltage twice, which is equivalent to prolonging the writing time of the driving voltage, improving the value of the driving voltage and improving the charging rate in one process. The pixel circuit can correctly display corresponding brightness, the black state is enough black, and the contrast of the display screen is increased.
Drawings
Fig. 1 is a circuit diagram of a pixel driving circuit according to an embodiment of the invention;
fig. 2 is a circuit diagram of a pixel driving circuit according to an embodiment of the invention;
fig. 3 is a circuit diagram of a pixel driving circuit according to an embodiment of the invention;
fig. 4 is a timing control diagram of the pixel driving circuit shown in fig. 3.
Fig. 5 is a circuit diagram of a pixel driving circuit according to an embodiment of the invention;
fig. 6 is a circuit diagram of a pixel driving circuit according to an embodiment of the invention;
fig. 7 is a timing control diagram of the pixel driving circuit shown in fig. 6.
Detailed Description
As described in the background art, there are technical problems in the prior art that the display brightness of a display screen with high resolution and large screen is abnormal and the contrast is low. The inventors have studied and found that the reason why such a problem occurs is as follows. The resolution ratio of the display screen is higher and higher, which reduces the writing time of the pixel circuit and makes the pixel circuit not enough to display the corresponding brightness correctly, even the problem of insufficient black of the black state occurs, and then the contrast ratio of the display screen is reduced.
In order to solve the above problems, the present invention provides a pixel driving circuit, which is applied to drive a display screen with high resolution and a large screen to emit light, and receives a driving light-emitting expansion voltage close to the driving voltage of the pixel of the current row before the driving light-emitting module receives the driving voltage, so that the driving light-emitting module receives the driving voltage twice, which is equivalent to lengthening the writing time of the driving voltage, increasing the driving voltage value, and increasing the charging rate in one process. The pixel circuit can correctly display corresponding brightness, the black state is enough black, and the contrast of the display screen is increased.
Specifically, the pixel driving circuit provided by the invention comprises: a driving light emitting module, a first end of which receives a power supply voltage; the anode of the light-emitting device is electrically connected with the second end of the driving light-emitting module; the first end of the data storage module is electrically connected with the first end of the driving light-emitting module, and the second end of the data storage module is electrically connected with the third end of the driving light-emitting module; the third end of the data storage control module receives a second scanning control signal, the first end of the data storage control module receives a data signal voltage, and the second end of the data storage control module is respectively and electrically connected with the second end of the data storage module and the third end of the driving light-emitting module; and the driving light-emitting expansion module is used for providing driving light-emitting expansion voltage for the driving light-emitting module, and the second end of the driving light-emitting expansion module is respectively and electrically connected with the second end of the data storage control module and the third end of the driving light-emitting module.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a circuit diagram of a pixel driving circuit according to an embodiment of the present invention, as shown in fig. 1, and as shown in fig. 1, the pixel driving circuit includes: the driving light-emitting module, the first end of the driving light-emitting module receives the power voltage Vdd; the anode of the light-emitting device OLED is electrically connected with the second end of the driving light-emitting module; the first end of the data storage module is electrically connected with the first end of the driving light-emitting module, and the second end of the data storage module is electrically connected with the third end of the driving light-emitting module; the third end of the data storage control module receives a second scanning control signal Scan2, the first end of the data storage control module receives a data signal voltage Vdata, and the second end of the data storage control module is respectively and electrically connected with the second end of the data storage module and the third end of the driving light-emitting module; and the driving light-emitting expansion module is used for providing a first driving light-emitting expansion voltage for the light-emitting driving light-emitting unit, and the second end of the driving light-emitting expansion module is respectively electrically connected with the second end of the data storage control module and the third end of the driving light-emitting module.
The driving light-emitting module is respectively and electrically connected with the power voltage Vdd output end, the data storage module and the light-emitting device OLED; the data storage module is respectively and electrically connected with the data storage control module, the data voltage signal wire and the driving light-emitting module; the data storage control module is electrically connected with the data storage module and receives a second scanning control signal Scan 2; the data storage control module controls whether the data signal voltage Vdata from the data signal line is transmitted to the data storage module under the action of the second Scan control signal Scan2, thereby writing the driving light emitting expansion voltage into the driving light emitting module.
In the embodiment of the invention, before the driving light-emitting module receives the driving voltage, the driving light-emitting expansion module writes the driving light-emitting expansion voltage into the driving light-emitting module, namely, the driving light-emitting module receives the voltage twice, which is equivalent to prolonging the writing time of the driving voltage, improving the value of the driving voltage and improving the charging rate in one process. The pixel circuit can correctly display corresponding brightness, the black state is enough black, and the contrast of the display screen is increased.
It should be understood that the Light Emitting device refers to a device capable of Emitting visible Light outwards, and may be an Organic Light-Emitting Diode (OLED) as described above, a Light-Emitting Diode (LED), and the like, and the specific type of the Light Emitting device is not limited by the embodiment of the present invention.
It should be further understood that the driving light emitting expansion module only needs to provide the driving light emitting expansion voltage before the third terminal of the driving light emitting module receives the driving voltage, and the specific structure of the driving light emitting module is not limited in the embodiments of the present invention. The source of the driving light emitting expansion voltage may be Integrated in the data signal voltage or may be from an Integrated Circuit (IC), and the source of the driving light emitting expansion voltage is not limited in the embodiments of the present invention.
Fig. 2 is a circuit diagram of a pixel driving circuit according to an embodiment of the invention, and as shown in fig. 2, the light-emitting expansion driving module includes: a first terminal of the first initialization unit is electrically connected with a second terminal of the data storage module and a third terminal of the driving light emitting module respectively, the second terminal of the first initialization unit receives an initialization voltage Vref, and the third terminal of the first initialization unit receives a first Scan control signal Scan 1; and a driving light-emitting expansion unit, wherein a first end of the driving light-emitting expansion unit is electrically connected with the output end of the data signal voltage Vdata so as to receive a first driving light-emitting expansion voltage, a second end of the driving light-emitting expansion unit is electrically connected with a second end of the data storage module and a third end of the driving light-emitting module respectively, and the third end of the driving light-emitting expansion unit receives a fourth scanning control signal Scan 4.
The first initialization unit controls whether the initialization voltage Vref is transmitted to the data storage module and drives the light emitting module by the first Scan control signal Scan1 from the first Scan control signal control line. The driving light-emitting expansion unit controls whether the first driving light-emitting expansion voltage is transmitted to the driving light-emitting module under a fourth Scan control signal Scan4 of the fourth Scan control signal control line.
In the embodiment of the invention, after the first initialization unit writes the initialization voltage Vref into the data storage module and the driving light-emitting module, the driving light-emitting expansion unit receives a first driving light-emitting expansion voltage input from the outside, and then the driving light-emitting expansion unit writes the first driving light-emitting expansion voltage into the data storage module and the driving light-emitting module. The driving light-emitting module receives the voltage twice, which is equivalent to prolonging the writing time of the driving voltage and improving the charging capability of the driving light-emitting module.
In a preferred embodiment, the voltage value of the first driving light-emitting expansion voltage is equal to the driving voltage value of the pixels on the previous row of the pixels on the current row. Because the driving voltage value of the last row of pixels is closest to the driving voltage value of the current row of pixels, the driving voltage value of the last row of pixels is used as the first driving light-emitting expansion voltage to be written into the driving light-emitting module, so that the time for driving the light-emitting module to be at the required driving voltage is longer, the charging rate of the driving light-emitting module can be improved, and the charging of the driving voltage of the current row of pixels is not influenced.
In one embodiment, as shown in fig. 2, further includes: and a first end of the third initialization unit is electrically connected with the anode of the light emitting device OLED, a second end of the third initialization unit is electrically connected with a second end of the first initialization module and receives the initialization voltage Vref, and a third end of the third initialization unit receives the third Scan control signal Scan 3.
The third initializing unit controls whether the initializing voltage Vref is transmitted to the anode of the light emitting device OLED by the third Scan control signal Scan3 from the third Scan control signal control line to reset, i.e., initialize, the anode voltage of the light emitting device OLED. The third initialization unit and the first initialization unit complete the flushing of the initialization voltage into the data storage module and the driving of the light emitting module and the anode of the light emitting device OLED together.
It should be understood that the first initialization unit and the third initialization unit may be integrated in one initialization module. The initialization module completes initialization of the data storage module and initialization of the anode of the light emitting device OLED.
In one embodiment, as shown in fig. 2, further includes: the light-emitting control module is connected between the power output end and the anode of the light-emitting device in series, receives the light-emitting control signal, and controls whether the power output end is connected with the anode of the light-emitting device or not according to the light-emitting control signal.
Fig. 3 is a circuit diagram of a pixel driving circuit according to an embodiment of the invention, and as shown in fig. 3, the driving light emitting module includes a driving transistor M1, and a source of the driving transistor M1 is electrically connected to an output terminal of a power supply Vdd; the data storage module comprises a first capacitor C1, wherein a first end of the first capacitor C1 is electrically connected with the output end of the power supply Vdd, and a second end of the first capacitor C1 is electrically connected with the gate of the driving transistor M1; the data storage control module comprises a second thin film transistor M2 and a third thin film transistor M3, wherein the gate of the second thin film transistor M2 and the gate of the third thin film transistor M3 receive a second scan control signal Ssan2, the source of the second thin film transistor M2 is electrically connected with the output end of the data signal power supply Vdata, and the drain of the second thin film transistor M2 is electrically connected with the source of the driving transistor M1; the source of the third thin film transistor M3 is electrically connected to the second end of the first capacitor C1 and the gate of the driving transistor M1, respectively, and the drain of the third thin film transistor M3 is electrically connected to the drain of the driving transistor M1; the first initialization unit comprises a fourth thin film transistor M4, wherein the source of the fourth thin film transistor M4 is connected to the second end of the first capacitor C1 and the gate of the driving transistor M1, respectively, the drain of the fourth thin film transistor M4 is electrically connected to the output end of the initialization power Vref, and the gate of the fourth thin film transistor M4 receives the first Scan control signal Scan 1; the driving light expansion unit comprises an eighth thin film transistor M8, wherein the source of the eighth thin film transistor M8 is electrically connected with the output end of the data signal power supply so as to receive the first driving light expansion voltage, the drain of the eighth thin film transistor M8 is connected with the source of the driving transistor M1, and the gate of the eighth thin film transistor M8 receives the fourth Scan control signal Scan 4; the third initialization unit includes a seventh thin film transistor M7, a source of the seventh thin film transistor M7 is electrically connected to an anode of the light emitting device OLED, a drain of the seventh thin film transistor M7 is electrically connected to a drain of the fourth thin film transistor M4 and both are electrically connected to an output terminal of the initialization power Vref, and a gate of the seventh thin film transistor M7 receives a third Scan control signal Scan 3; the light emitting control module comprises a fifth thin film transistor M5 and a sixth thin film transistor M6, wherein the gate of the fifth thin film transistor M5 and the gate of the sixth thin film transistor M6 both receive the light emitting control signal EM, the source of the fifth thin film transistor M5 is electrically connected to the output terminal of the power supply Vdd, the drain of the fifth thin film transistor M5 is electrically connected to the source of the driving transistor M1, the drain of the sixth thin film transistor M6 is electrically connected to the drain of the driving transistor M1, and the source of the sixth thin film transistor M6 is electrically connected to the anode of the light emitting device OLED.
The second and third thin film transistors M2 and M3 control whether the data signal voltage Vdata from the data signal line is transmitted to the first terminal of the first capacitor C1 in the second Scan control signal Scan 2. When the fourth thin film transistor M4 is turned on by the first Scan control signal Scan1, the initialization voltage Vref is transmitted to the second terminal of the first capacitor C1 and the gate (i.e., N point) of the driving transistor M1, so as to reset the voltage of the first capacitor C1, i.e., initialize the data storage module. When the seventh thin film transistor M7 is turned on by the first Scan control signal Scan3, the initialization voltage Vref is caused to be transmitted to the anode of the light emitting device OLED to effect the reset of the anode voltage of the light emitting device OLED, i.e., the initialization of the anode of the light emitting device OLED. Whether the eighth thin film transistor M8 transmits the first driving light emitting extension voltage from the data signal voltage Vdata to the gate (i.e., N point) of the driving transistor M1 under the control of the fourth Scan control signal Scan4 is, when the eighth thin film transistor M8 is turned on by the fourth Scan control signal Scan4, the first driving light emitting extension voltage from the data signal voltage Vdata is transmitted to the gate (i.e., N point) of the driving transistor M1. The fifth thin film transistor M5 and the sixth thin film transistor M6 are turned on or off under the control of the emission control signal EM, and when the fifth thin film transistor M5 and the sixth thin film transistor M6 are turned on, the turning on of the fifth thin film transistor M5 enables the power voltage Vdd to be supplied to the source of the driving transistor M7 so that a voltage difference Vdata-Vdd is formed between the gate and the source of the driving transistor M7. The turn-on of the sixth thin film transistor M6 enables the drain of the driving transistor M7 to be connected to the anode of the light emitting device, so that the current formed by the driving transistor M7 can be transmitted to the light emitting device OLED, and the light emitting device emits light.
Fig. 4 is a timing control diagram of the pixel driving circuit shown in fig. 3. In order to better understand the pixel driving circuit, the operation of the pixel driving circuit will be described in detail with reference to a more specific embodiment.
As shown in fig. 4, the operation of the pixel driving circuit shown in fig. 3 is as follows:
(1) initialization phase T1:
applying a first Scan control signal Scan1 having a first voltage amplitude to the gate of the fourth thin film transistor M4, the first Scan control signal Scan1 having the first voltage amplitude makes the fourth thin film transistor M4 turned on; applying a fourth Scan control signal Scan4 having a third voltage amplitude to the gate of the eighth thin film transistor M8, the fourth Scan control signal Scan4 having the third voltage amplitude turning off the eighth thin film transistor M8; applying a second Scan control signal Scan2 having a third voltage amplitude to the gate of the second thin film transistor M2 and the gate of the third thin film transistor M3, the second Scan control signal Scan2 having the third voltage amplitude turning off the second thin film transistor M2 and the third thin film transistor M3; applying a third Scan control signal Scan3 having a third voltage amplitude to the gate of the seventh thin film transistor M7, the third Scan control signal Scan3 having the third voltage amplitude turning off the seventh thin film transistor M7; the light emission control signal EM having the third voltage amplitude is applied to the gate of the fifth thin film transistor M5 and the gate of the sixth thin film transistor M6, and turns off the fifth thin film transistor M5 and the sixth thin film transistor M6.
Since the fourth tft M4 is turned on, the voltage at the Q1 terminal of the first capacitor C1 is Vref, and the voltage stored at the Q1 terminal of the first capacitor C1 is cleared; the gate voltage of the driving transistor M1 is Vref.
(2) Driving light emission extension voltage writing phase T2:
applying the first Scan control signal Scan1 having the third voltage amplitude to the gate of the fourth thin film transistor M4, the first Scan control signal Scan1 having the third voltage amplitude turns off the fourth thin film transistor M4; applying a fourth Scan control signal Scan4 with a first voltage amplitude to the gate of the eighth thin film transistor M8, the fourth Scan control signal Scan4 with a third voltage amplitude makes the eighth thin film transistor M8 turned on; applying a second Scan control signal Scan2 having a third voltage amplitude to the gate of the second thin film transistor M2 and the gate of the third thin film transistor M3, the second Scan control signal Scan2 having the third voltage amplitude turning off the second thin film transistor M2 and the third thin film transistor M3; applying a third Scan control signal Scan3 having a third voltage amplitude to the gate of the seventh thin film transistor M7, the third Scan control signal Scan3 having the third voltage amplitude turning off the seventh thin film transistor M7; the light emission control signal EM having the third voltage amplitude is applied to the gate of the fifth thin film transistor M5 and the gate of the sixth thin film transistor M6, and turns off the fifth thin film transistor M5 and the sixth thin film transistor M6.
Since the eighth tft M8 is turned on, the first driving light-emitting expansion voltage equal to the previous row pixel driving voltage value of the current row of pixels is written into the first capacitor C1 and the gate of the driving transistor M1.
(3) Data write phase T3:
applying the first Scan control signal Scan1 having the third voltage amplitude to the gate of the fourth thin film transistor M4, the first Scan control signal Scan1 having the third voltage amplitude turns off the fourth thin film transistor M4; applying a fourth Scan control signal Scan4 having a third voltage amplitude to the gate of the eighth thin film transistor M8, the fourth Scan control signal Scan4 having the third voltage amplitude turning off the eighth thin film transistor M8; applying a second Scan control signal Scan2 having a first voltage amplitude to the gate of the second thin film transistor M2 and the gate of the third thin film transistor M3, the second Scan control signal Scan2 having the first voltage amplitude causing the second thin film transistor M2 and the third thin film transistor M3 to be turned on; applying a third Scan control signal Scan3 having a third voltage amplitude to the gate of the seventh thin film transistor M7, the third Scan control signal Scan3 having the third voltage amplitude turning off the seventh thin film transistor M7; the light emission control signal EM having the third voltage amplitude is applied to the gate of the fifth thin film transistor M5 and the gate of the sixth thin film transistor M6, and turns off the fifth thin film transistor M5 and the sixth thin film transistor M6.
Due to the conduction of the second thin film transistor M2 and the third thin film transistor M3, the voltage at the gate (i.e., point N) of the driving transistor M1 is equal to Vdata, and the driving voltage is written into the driving light emitting transistor M1.
(4) Display device light emission period T4:
applying the first Scan control signal Scan1 having the third voltage amplitude to the gate of the fourth thin film transistor M4, the first Scan control signal Scan1 having the third voltage amplitude turns off the fourth thin film transistor M4; applying a fourth Scan control signal Scan4 having a third voltage amplitude to the gate of the eighth thin film transistor M8, the fourth Scan control signal Scan4 having the third voltage amplitude turning off the eighth thin film transistor M8; applying a second Scan control signal Scan2 having a third voltage amplitude to the gate of the second thin film transistor M2 and the gate of the third thin film transistor M3, the second Scan control signal Scan2 having the third voltage amplitude turning off the second thin film transistor M2 and the third thin film transistor M3; applying a third Scan control signal Scan3 having a first voltage magnitude to the gate of the seventh thin film transistor M7, the third Scan control signal Scan3 having a third voltage magnitude causing the seventh thin film transistor M7 to be turned on; the light emission control signal EM having the first voltage amplitude is applied to the gate of the fifth thin film transistor M5 and the gate of the sixth thin film transistor M6, and the light emission control signal EM having the first voltage amplitude turns on the fifth thin film transistor M5 and the sixth thin film transistor M6.
Due to the turn-on of the seventh thin film transistor M7, the initialization voltage Vref is transmitted to the anode of the light emitting device OLED to achieve the reset of the anode voltage of the light emitting device OLED, i.e., the initialization of the anode of the light emitting device OLED. Due to the conduction of the fifth thin film transistor M5, the source voltage of the driving transistor M5 is equal to the power voltage Vdd, and the difference between the gate voltage and the source voltage of the driving transistor M5 is equal to Vdd-Vdata, thereby generating a driving current; due to the conduction of the sixth thin film transistor M6, the current generated by the driving transistor M1 can be transmitted to the anode of the light emitting device OLED.
Before the driving voltage is written into the driving transistor M1, the first driving light-emitting expansion voltage equal to the driving voltage value of the pixel in the previous row of the pixel in the current row is already written into the first capacitor C1 and the gate of the driving transistor M1, i.e., the driving transistor M1 receives the voltage twice, which is equivalent to lengthening the writing time of the driving voltage, increasing the driving voltage value and increasing the charging rate in one process. The pixel circuit can correctly display corresponding brightness, the black state is enough black, and the contrast of the display screen is increased.
It should be understood that the thin film transistors provided in the above embodiments of the present invention, for example, the driving transistor M1, the first thin film transistor M1, the second thin film transistor M2, the third thin film transistor M3, the fourth thin film transistor M4, the fifth thin film transistor M5, and the sixth thin film transistor M6 are PMOS transistors, and the first voltage amplitude is a low-level voltage value and the third voltage amplitude is a high-level voltage value. Similarly, those skilled in the art may also divide the transistors in the pixel circuit into PMOS transistors and NMOS transistors, and the amplitude of the voltage applied to the corresponding transistor changes with the type of the crystal light, for example, in the same pixel circuit, if the second thin film transistor M2 and the third thin film transistor M3 are both PMOS transistors, the first voltage amplitude of the second Scan control signal Scan2 applied to the gate of the second thin film transistor M2 and the gate of the third thin film transistor M3 is a low-level voltage value; if the fourth thin film transistor M4 is an NMOS transistor, the first voltage amplitude of the first Scan control signal Scan1 applied to the gate of the fourth thin film transistor M4 is a high level voltage. Therefore, the present invention does not limit the kinds of transistors in the pixel driving circuit and the amplitudes of the signal voltages applied to the corresponding transistors.
Fig. 5 is a circuit diagram of a pixel driving circuit according to an embodiment of the invention, and as shown in fig. 5, the pixel driving circuit includes: the device comprises a driving light-emitting module, a light-emitting device OLED, a data storage module, a data storage control module and a driving light-emitting expansion module. The driving light expansion module includes: a first end of the second initialization unit is electrically connected with a second end of the data storage module and a third end of the driving light-emitting module respectively, the second end of the second initialization unit is electrically connected with the driving voltage extension line, and the third end of the second initialization unit receives the first scanning control signal; and the driving voltage expansion line receives a second driving voltage expansion signal, and the second driving voltage expansion signal sequentially has a first voltage amplitude, a second voltage amplitude and a third voltage amplitude, wherein the first voltage amplitude is equal to the initialization voltage, the second voltage amplitude is equal to the second driving light-emitting expansion voltage, the third voltage amplitude is equal to the data signal voltage, and the second driving light-emitting expansion voltage is greater than the initialization voltage and less than the data signal voltage.
In the embodiment of the invention, the second initialization unit controls whether the driving voltage extension line transmits the second driving voltage extension signal to the data storage module and the light emitting module under the action of the first Scan control signal Scan1 from the first Scan control signal control line. The first initialization unit receives a second driving voltage expansion signal transmitted from the driving voltage expansion line, and when the second driving voltage expansion signal is at a first voltage amplitude, the initialization voltage Vref is transmitted to the data storage module and the driving light emitting module because the first voltage amplitude is equal to the initialization voltage Vref, so that initialization of the data storage module and the driving light emitting module is completed. After the first initialization unit writes the initialization voltage Vref into the data storage module and the driving light-emitting module, when the second driving voltage expansion signal is at the second voltage amplitude, the data storage module and the driving light-emitting module receive the second driving light-emitting expansion voltage, the driving light-emitting expansion unit writes the second driving light-emitting expansion voltage into the data storage module and the driving light-emitting module, and the driving light-emitting module receives the voltage twice, which is equivalent to prolonging the writing time of the driving voltage and improving the charging capability of the driving light-emitting module.
In a preferred embodiment, the voltage value of the second driving light-emitting expansion voltage is equal to the driving voltage value of the pixels on the previous row of the pixels on the current row. Because the driving voltage value of the last row of pixels is closest to the driving voltage value of the current row of pixels, the driving voltage value of the last row of pixels is used as the second driving light-emitting expansion voltage to be written into the driving light-emitting module, so that the time for driving the light-emitting module to be at the required driving voltage is longer, the charging rate of the driving light-emitting module can be improved, and the charging of the driving voltage of the current row of pixels is not influenced.
In one embodiment, as shown in fig. 5, further includes: and the OLED anode of the light emitting device at the first end of the third initialization unit is electrically connected, the second end of the third initialization unit solely receives the initialization voltage Vref, and the third end of the third initialization unit receives the third Scan control signal Scan 3. The third initializing unit controls only whether the initializing voltage Vref is transmitted to the anode of the light emitting device OLED by the first Scan control signal Scan3 from the third Scan control signal control line to reset, i.e., initialize, the anode voltage of the light emitting device OLED.
In one embodiment, as shown in fig. 5, further includes: the light-emitting control module is connected between the power output end and the anode of the light-emitting device in series, receives the light-emitting control signal, and controls whether the power output end is connected with the anode of the light-emitting device or not according to the light-emitting control signal.
Fig. 6 is a circuit diagram of a pixel driving circuit according to an embodiment of the invention, and as shown in fig. 6, the driving light emitting module includes a driving transistor M1, and a source of the driving transistor M1 is electrically connected to an output terminal of a power supply Vdd; the data storage module comprises a first capacitor C1, wherein a first end of the first capacitor C1 is electrically connected with the output end of the power supply Vdd, and a second end of the first capacitor C1 is electrically connected with the gate of the driving transistor M1; the data storage control module comprises a second thin film transistor M2 and a third thin film transistor M3, wherein the gate of the second thin film transistor M2 and the gate of the third thin film transistor M3 receive a second scan control signal Ssan2, the source of the second thin film transistor M2 is electrically connected with the output end of the data signal power supply Vdata, and the drain of the second thin film transistor M2 is electrically connected with the source of the driving transistor M1; the source of the third thin film transistor M3 is electrically connected to the second end of the first capacitor C1 and the gate of the driving transistor M1, respectively, and the drain of the third thin film transistor M3 is electrically connected to the drain of the driving transistor M1; the first initialization unit comprises a fourth thin film transistor M4, wherein the source of the fourth thin film transistor M4 is connected to the second end of the first capacitor C1 and the gate of the driving transistor M1, respectively, the drain of the fourth thin film transistor M4 is electrically connected to the driving voltage extension line Reset, and the gate of the fourth thin film transistor M4 receives a first Scan control signal Scan 1; the third initialization unit includes a seventh thin film transistor M7, a source of the seventh thin film transistor M7 is electrically connected to an anode of the light emitting device OLED, a drain of the seventh thin film transistor M7 and a drain of the fourth thin film transistor M4 are separately electrically connected to an output terminal of the initialization power Vref, and a gate of the seventh thin film transistor M7 receives the third Scan control signal Scan 3; the light emitting control module comprises a fifth thin film transistor M5 and a sixth thin film transistor M6, wherein the gate of the fifth thin film transistor M5 and the gate of the sixth thin film transistor M6 both receive the light emitting control signal EM, the source of the fifth thin film transistor M5 is electrically connected to the output terminal of the power supply Vdd, the drain of the fifth thin film transistor M5 is electrically connected to the source of the driving transistor M1, the drain of the sixth thin film transistor M6 is electrically connected to the drain of the driving transistor M1, and the source of the sixth thin film transistor M6 is electrically connected to the anode of the light emitting device OLED.
The second and third thin film transistors M2 and M3 control whether the data signal voltage Vdata from the data signal line is transmitted to the first terminal of the first capacitor C1 in the second Scan control signal Scan 2. When the fourth thin film transistor M4 is turned on by the first Scan control signal Scan1, the second driving voltage extension signal with the first voltage amplitude is transmitted to the second terminal of the first capacitor C1 and the gate (i.e., N point) of the driving transistor M1, and the first voltage amplitude is equal to the initialization voltage Vref, so that the voltages of the first capacitor C1 and the driving transistor M1 are reset, that is, the data storage module is initialized. When the seventh thin film transistor M7 is turned on by the first Scan control signal Scan3, the initialization voltage Vref is caused to be transmitted to the anode of the light emitting device OLED to effect the reset of the anode voltage of the light emitting device OLED, i.e., the initialization of the anode of the light emitting device OLED. The charging of the first capacitor C1, the driving transistor M1 and the anode voltage of the OLED is completed. After the initialization is completed, the second driving voltage extension signal is at the second voltage amplitude, and the second driving light emission extension voltage from the driving voltage extension line Y is transferred to the gate (i.e., N point) of the driving transistor M1 since the second voltage amplitude is equal to the second driving light emission extension voltage. After the gate (i.e., point N) of the driving transistor M1 writes the second driving light-emitting expansion voltage, the driving voltage is also written, and the gate (i.e., point N) of the driving transistor M1 receives the voltage twice, which is equivalent to prolonging the writing time of the driving voltage, and improving the charging capability of the gate (i.e., point N) of the driving transistor M1. The fifth thin film transistor M5 and the sixth thin film transistor M6 are turned on or off under the control of the emission control signal EM, and when the fifth thin film transistor M5 and the sixth thin film transistor M6 are turned on, the turning on of the fifth thin film transistor M5 enables the power voltage Vdd to be supplied to the source of the driving transistor M7 so that a voltage difference Vdata-Vdd is formed between the gate and the source of the driving transistor M1. The turn-on of the sixth thin film transistor M6 enables the drain of the driving transistor M1 to be connected to the anode of the light emitting device, so that the current formed by the driving transistor M1 can be transmitted to the light emitting device OLED, and the light emitting device emits light.
Fig. 7 is a timing control diagram of the pixel driving circuit shown in fig. 6. In order to better understand the pixel driving circuit, the operation of the pixel driving circuit will be described in detail with reference to a more specific embodiment.
As shown in fig. 7, the operation of the pixel driving circuit shown in fig. 6 is as follows:
(1) the first initialization and driving light emitting expansion voltage writing phase stage T1:
applying a first Scan control signal Scan1 having a first voltage amplitude to the gate of the fourth thin film transistor M4, the first Scan control signal Scan1 having the first voltage amplitude makes the fourth thin film transistor M4 turned on; applying a second Scan control signal Scan2 having a third voltage amplitude to the gate of the second thin film transistor M2 and the gate of the third thin film transistor M3, the second Scan control signal Scan2 having the third voltage amplitude turning off the second thin film transistor M2 and the third thin film transistor M3; applying a third Scan control signal Scan3 having a third voltage amplitude to the gate of the seventh thin film transistor M7, the third Scan control signal Scan3 having the third voltage amplitude turning off the seventh thin film transistor M7; the light emission control signal EM having the third voltage amplitude is applied to the gate of the fifth thin film transistor M5 and the gate of the sixth thin film transistor M6, and turns off the fifth thin film transistor M5 and the sixth thin film transistor M6.
Since the fourth thin film transistor M4 is turned on, the driving voltage extension signal is transmitted to the Q1 terminal of the first capacitor C1 and the gate of the driving transistor M1. When the driving voltage expansion signal is at the first voltage amplitude, since the first voltage amplitude is equal to the initialization voltage Vref, the voltage at the Q1 end of the first capacitor C1 is Vref, and the potential stored at the Q1 end of the first capacitor C1 is cleared; the gate voltage of the driving transistor M1 is Vref. When the driving voltage expansion signal is at the second voltage amplitude, the second driving light-emitting expansion voltage is written into the first capacitor C1 and the driving transistor M1 because the second voltage amplitude is equal to the second driving light-emitting expansion voltage.
(2) Data write phase T2:
applying the first Scan control signal Scan1 having the third voltage amplitude to the gate of the fourth thin film transistor M4, the first Scan control signal Scan1 having the third voltage amplitude turns off the fourth thin film transistor M4; applying a second Scan control signal Scan2 having a first voltage amplitude to the gate of the second thin film transistor M2 and the gate of the third thin film transistor M3, the second Scan control signal Scan2 having the first voltage amplitude causing the second thin film transistor M2 and the third thin film transistor M3 to be turned on; applying a third Scan control signal Scan3 having a third voltage amplitude to the gate of the seventh thin film transistor M7, the third Scan control signal Scan3 having the third voltage amplitude turning off the seventh thin film transistor M7; the light emission control signal EM having the third voltage amplitude is applied to the gate of the fifth thin film transistor M5 and the gate of the sixth thin film transistor M6, and turns off the fifth thin film transistor M5 and the sixth thin film transistor M6.
Due to the conduction of the second thin film transistor M2 and the third thin film transistor M3, the voltage at the gate (i.e., point N) of the driving transistor M1 is equal to Vdata, and the driving voltage is written into the driving light emitting transistor M1. The first capacitor C1 and the driving transistor M1 write the second driving light-emitting expansion voltage before Vdata is written into the gate (i.e., N point) of the driving transistor M1. The second driving light-emitting expansion voltage close to the driving voltage of the previous row of pixels in the current row has been written into a capacitor C1 and the driving transistor M1. The driving transistor M1 receives the voltage twice, which is equivalent to lengthening the writing time of the driving voltage, and improves the charging capability of the driving light emitting module.
(3) OLED anode initialization phase T3:
applying the first Scan control signal Scan1 having the third voltage amplitude to the gate of the fourth thin film transistor M4, the first Scan control signal Scan1 having the third voltage amplitude turns off the fourth thin film transistor M4; applying a second Scan control signal Scan2 having a third voltage amplitude to the gate of the second thin film transistor M2 and the gate of the third thin film transistor M3, the second Scan control signal Scan2 having the third voltage amplitude turning off the second thin film transistor M2 and the third thin film transistor M3; applying a third Scan control signal Scan3 having a third voltage amplitude to the gate of the seventh thin film transistor M7, the third Scan control signal Scan3 having the third voltage amplitude turning off the seventh thin film transistor M7; the light emission control signal EM having the third voltage amplitude is applied to the gate of the fifth thin film transistor M5 and the gate of the sixth thin film transistor M6, and turns off the fifth thin film transistor M5 and the sixth thin film transistor M6.
When the seventh thin film transistor M7 is turned on by the first Scan control signal Scan3, the initialization voltage Vref is caused to be transmitted to the anode of the light emitting device OLED to effect the reset of the anode voltage of the light emitting device OLED, i.e., the initialization of the anode of the light emitting device OLED.
(4) Display device light emission period T4:
applying the first Scan control signal Scan1 having the third voltage amplitude to the gate of the fourth thin film transistor M4, the first Scan control signal Scan1 having the third voltage amplitude turns off the fourth thin film transistor M4; applying a second Scan control signal Scan2 having a third voltage amplitude to the gate of the second thin film transistor M2 and the gate of the third thin film transistor M3, the second Scan control signal Scan2 having the third voltage amplitude turning off the second thin film transistor M2 and the third thin film transistor M3; applying a third Scan control signal Scan3 having a third voltage amplitude to the gate of the seventh thin film transistor M7, the third Scan control signal Scan3 having the third voltage amplitude turning off the seventh thin film transistor M7; the light emission control signal EM having the first voltage amplitude is applied to the gate of the fifth thin film transistor M5 and the gate of the sixth thin film transistor M6, and the light emission control signal EM having the first voltage amplitude turns on the fifth thin film transistor M5 and the sixth thin film transistor M6.
Due to the conduction of the fifth thin film transistor M5, the source voltage of the driving transistor M5 is equal to the power voltage Vdd, and the difference between the gate voltage and the source voltage of the driving transistor M5 is equal to Vdd-Vdata, thereby generating a driving current; due to the conduction of the sixth thin film transistor M6, the current generated by the driving transistor M1 can be transmitted to the anode of the light emitting device OLED.
Before the driving voltage is written into the driving transistor M1, the driving voltage expansion signal is caused to be transmitted to the Q1 terminal of the first capacitor C1 and the gate of the driving transistor M1. When the driving voltage expansion signal is at the second voltage amplitude, the second driving light-emitting expansion voltage is written into the first capacitor C1 and the driving transistor M1 because the second voltage amplitude is equal to the second driving light-emitting expansion voltage. The second driving light-emitting expansion voltage equal to the driving voltage value of the pixel in the previous row of the pixel in the current row is written into the first capacitor C1 and the gate of the driving transistor M1, that is, the driving transistor M1 receives the voltage twice, which is equivalent to prolonging the writing time of the driving voltage, thereby improving the driving voltage value and the charging rate in one process. The pixel circuit can correctly display corresponding brightness, the black state is enough black, and the contrast of the display screen is increased.
It should be understood that the thin film transistors provided in the above embodiments of the present invention, for example, the driving transistor M1, the first thin film transistor M1, the second thin film transistor M2, the third thin film transistor M3, the fourth thin film transistor M4, the fifth thin film transistor M5, and the sixth thin film transistor M6 are PMOS transistors, and the first voltage amplitude is a low-level voltage value and the third voltage amplitude is a high-level voltage value. Similarly, those skilled in the art may also divide the transistors in the pixel circuit into PMOS transistors and NMOS transistors, and the amplitude of the voltage applied to the corresponding transistor changes with the type of the crystal light, for example, in the same pixel circuit, if the second thin film transistor M2 and the third thin film transistor M3 are both PMOS transistors, the first voltage amplitude of the second Scan control signal Scan2 applied to the gate of the second thin film transistor M2 and the gate of the third thin film transistor M3 is a low-level voltage value; if the fourth thin film transistor M4 is an NMOS transistor, the first voltage amplitude of the first Scan control signal Scan1 applied to the gate of the fourth thin film transistor M4 is a high level voltage. Therefore, the present invention does not limit the kinds of transistors in the pixel driving circuit and the amplitudes of the signal voltages applied to the corresponding transistors.
An embodiment of the present invention provides a driving method of a pixel driving circuit, for driving the pixel driving circuit, where the driving method includes: before the driving light-emitting module receives the driving voltage, the driving light-emitting expansion voltage sent by the driving light-emitting expansion module is received. The pixel driving method provided by the embodiment of the invention receives the driving light-emitting expansion voltage close to the driving voltage of the pixel of the current row before receiving the driving voltage, so that the driving light-emitting module receives the voltage twice, namely, the writing time of the driving voltage is prolonged, the driving voltage value is improved, and the charging rate in one process is improved. The pixel circuit can correctly display corresponding brightness, the black state is enough black, and the contrast of the display screen is increased.
The embodiment of the present invention further provides a display device, which includes a plurality of pixels and a plurality of pixel driving circuits, each pixel driving circuit correspondingly drives one pixel to operate, wherein the structure of the pixel driving circuit is as described above. In the display device provided by the embodiment of the invention, the driving light-emitting expansion module for providing the driving light-emitting expansion voltage for the light-emitting driving light-emitting module is arranged in the pixel driving circuit, and the driving light-emitting expansion voltage close to the driving voltage of the pixel of the current row is received before the driving light-emitting module receives the driving voltage, so that the driving light-emitting module receives the voltage twice, namely, the writing time of the driving voltage is prolonged, the driving voltage value is improved, and the charging rate in one process is improved. The pixel circuit can correctly display corresponding brightness, the black state is enough black, and the contrast of the display screen is increased.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.

Claims (10)

1. A pixel driving circuit, comprising:
a driving light emitting module, a first end of which receives a power supply voltage;
the anode of the light-emitting device is electrically connected with the second end of the driving light-emitting module;
the first end of the data storage module is electrically connected with the first end of the driving light-emitting module, and the second end of the data storage module is electrically connected with the third end of the driving light-emitting module;
the third end of the data storage control module receives a second scanning control signal, the first end of the data storage control module receives a data signal voltage, and the second end of the data storage control module is respectively and electrically connected with the second end of the data storage module and the third end of the driving light-emitting module; and
and the second end of the driving light-emitting expansion module is respectively and electrically connected with the second end of the data storage control module and the third end of the driving light-emitting module.
2. The pixel driving circuit according to claim 1, wherein the driving light expansion module comprises:
a first initialization unit, a first end of which is electrically connected to a second end of the data storage module and a third end of the driving light emitting module, respectively, the second end of which receives an initialization voltage, and the third end of which receives a first scan control signal; and
the driving light-emitting expansion unit is used for providing a first driving light-emitting expansion voltage for the light-emitting driving light-emitting unit, the first end of the driving light-emitting expansion unit receives the first driving light-emitting expansion voltage, the second end of the driving light-emitting expansion unit is electrically connected with the second end of the data storage module and the third end of the driving light-emitting module, and the third end of the driving light-emitting expansion unit receives a fourth scanning control signal;
preferably, the voltage value of the first driving light-emitting expansion voltage is equal to the driving voltage value of the pixels on the previous row of the pixels on the current row.
3. The pixel driving circuit according to claim 1, wherein the driving light expansion module comprises:
a first end of the second initialization unit is electrically connected with a second end of the data storage module and a third end of the driving light emitting module respectively, the second end of the second initialization unit is electrically connected with the driving voltage extension line, and the third end of the second initialization unit receives a first scanning control signal; and
the driving voltage extension line receives a second driving voltage extension signal, and the second driving voltage extension signal sequentially has a first voltage amplitude, a second voltage amplitude and a third voltage amplitude, wherein the first voltage amplitude is equal to an initialization voltage, the second voltage amplitude is equal to a second driving light-emitting extension voltage, the third voltage amplitude is equal to the data signal voltage, and the second driving light-emitting extension voltage is greater than the initialization voltage and less than the data signal voltage;
preferably, the voltage value of the second driving light-emitting expansion voltage is equal to the driving voltage value of the pixels on the previous row of the pixels on the current row.
4. The pixel driving circuit according to claim 2, further comprising: a first end of the third initialization unit is electrically connected with the anode of the light emitting device, a second end of the third initialization unit is electrically connected with a second end of the first initialization module and receives the initialization voltage, and a third end of the third initialization unit receives a third scanning control signal.
5. The pixel driving circuit according to claim 3, further comprising: a third initializing unit, a first end of which is electrically connected to the anode of the light emitting device, a second end of which receives an initializing voltage alone, and a third end of which receives a third scanning control signal.
6. The pixel driving circuit according to claim 4 or 5, further comprising:
the light-emitting control module is connected between the power output end and the anode of the light-emitting device in series, receives a light-emitting control signal, and controls whether the power output end is connected with the anode of the light-emitting device or not according to the light-emitting control signal.
7. The pixel driving circuit according to claim 4,
the driving light-emitting module comprises a driving transistor, and the source electrode of the driving transistor is electrically connected with the output end of the power supply;
the data storage module comprises a first capacitor, wherein a first end of the first capacitor is electrically connected with an output end of the power supply, and a second end of the first capacitor is electrically connected with a grid electrode of the driving transistor;
the data storage control module comprises a second thin film transistor and a third thin film transistor, wherein the grid electrode of the second thin film transistor and the grid electrode of the third thin film transistor receive the second scanning control signal, the source electrode of the second thin film transistor is electrically connected with the output end of the data signal power supply, and the drain electrode of the second thin film transistor is electrically connected with the source electrode of the driving transistor; the source electrode of the third thin film transistor is electrically connected with the second end of the first capacitor and the grid electrode of the driving transistor respectively, and the drain electrode of the third thin film transistor is electrically connected with the drain electrode of the driving transistor;
the first initialization unit comprises a fourth thin film transistor, wherein a source electrode of the fourth thin film transistor is respectively connected with the second end of the first capacitor and a grid electrode of the driving transistor, a drain electrode of the fourth thin film transistor is electrically connected with an output end of the initialization power supply, and the grid electrode of the fourth thin film transistor receives the first scanning control signal;
the driving light-emitting expansion module comprises an eighth thin film transistor, wherein the source electrode of the eighth thin film transistor is electrically connected with the output end of the data signal power supply so as to receive a first driving light-emitting expansion voltage, the drain electrode of the eighth thin film transistor is connected with the source electrode of the driving transistor, and the grid electrode of the eighth thin film transistor receives the fourth scanning control signal;
the third initialization unit comprises a seventh thin film transistor, a source electrode of the seventh thin film transistor is electrically connected with an anode of the light emitting device, a drain electrode of the seventh thin film transistor is electrically connected with a drain electrode of the fourth thin film transistor and is electrically connected with an output end of the initialization power supply, and a grid electrode of the seventh thin film transistor receives the third scanning control signal;
the pixel driving circuit further includes: the light-emitting control module is connected between a power output end and the anode of the light-emitting device in series;
the light-emitting control module comprises a fifth thin film transistor and a sixth thin film transistor, wherein the grid electrode of the fifth thin film transistor and the grid electrode of the sixth thin film transistor both receive light-emitting control signals, the source electrode of the fifth thin film transistor is electrically connected with the output end of the power supply, the drain electrode of the fifth thin film transistor is electrically connected with the source electrode of the driving transistor, the drain electrode of the sixth thin film transistor is electrically connected with the drain electrode of the driving transistor, and the source electrode of the sixth thin film transistor is electrically connected with the anode of the light-emitting device.
8. The pixel driving circuit according to claim 5,
the driving light-emitting module comprises a driving transistor, and the source electrode of the driving transistor is connected with the output end of the power supply;
the data storage module comprises a first capacitor, wherein a first end of the first capacitor is connected with an output end of a power supply, and a second end of the first capacitor is connected with a grid electrode of the driving transistor;
the data storage control module comprises a second thin film transistor and a third thin film transistor, wherein the grid electrode of the second thin film transistor and the grid electrode of the third thin film transistor receive the second scanning control signal, the source electrode of the second thin film transistor receives the data signal voltage, and the drain electrode of the second thin film transistor is connected with the source electrode of the driving transistor; the source electrode of the third thin film transistor is respectively connected with the second end of the first capacitor and the grid electrode of the driving transistor, and the drain electrode of the third thin film transistor is connected with the drain electrode of the driving transistor;
the second initialization unit comprises a fourth thin film transistor, wherein a source electrode of the fourth thin film transistor is respectively connected with the second end of the first capacitor and a grid electrode of the driving transistor, a drain electrode of the fourth thin film transistor is electrically connected with the driving voltage extension line, and the grid electrode of the fourth thin film transistor receives the first scanning control signal;
the third initialization unit comprises a seventh thin film transistor, the source electrode of the seventh thin film transistor is electrically connected with the anode of the light-emitting device, the drain electrode of the seventh thin film transistor is separately electrically connected with the output end of the initialization power supply, and the grid electrode of the seventh thin film transistor receives the third scanning control signal;
the pixel driving circuit further includes: the light-emitting control module is connected between a power output end and the anode of the light-emitting device in series;
the light-emitting control module comprises a fifth thin film transistor and a sixth thin film transistor, wherein the grid electrode of the fifth thin film transistor and the grid electrode of the sixth thin film transistor both receive light-emitting control signals, the source electrode of the fifth thin film transistor is electrically connected with the output end of the power supply, the drain electrode of the fifth thin film transistor is electrically connected with the source electrode of the driving transistor, the drain electrode of the sixth thin film transistor is electrically connected with the drain electrode of the driving transistor, and the source electrode of the sixth thin film transistor is electrically connected with the anode of the light-emitting device.
9. A driving method of a pixel driving circuit for driving the pixel driving circuit according to any one of claims 1 to 8, the driving method comprising:
before the driving light-emitting module receives the driving voltage, the driving light-emitting expansion voltage sent by the driving light-emitting expansion module is received.
10. A display device, comprising:
a plurality of pixels; and the number of the first and second groups,
a plurality of pixel drive circuits according to any one of claims 1 to 8, wherein each of said pixel drive circuits drives each of said pixels into operation.
CN202010120557.4A 2020-02-26 2020-02-26 Pixel driving circuit and display device Active CN111179840B (en)

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