CN108154845A - A kind of pixel-driving circuit and its driving method, display device - Google Patents

A kind of pixel-driving circuit and its driving method, display device Download PDF

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Publication number
CN108154845A
CN108154845A CN201810214416.1A CN201810214416A CN108154845A CN 108154845 A CN108154845 A CN 108154845A CN 201810214416 A CN201810214416 A CN 201810214416A CN 108154845 A CN108154845 A CN 108154845A
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CN
China
Prior art keywords
control
driving transistor
pole
grid
driving
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CN201810214416.1A
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Chinese (zh)
Inventor
董甜
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京东方科技集团股份有限公司
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Priority to CN201810214416.1A priority Critical patent/CN108154845A/en
Publication of CN108154845A publication Critical patent/CN108154845A/en

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/30Control 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
    • G09G3/32Control 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]
    • G09G3/3208Control 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 present invention discloses a kind of pixel-driving circuit and its driving method, display device, it is related to display technology field, it can not solve the problem of that short-term image retention existing for display device and IR Drop, the threshold voltage of driving transistor have an impact the display brightness uniformity of display device to solve existing pixel-driving circuit.The pixel-driving circuit includes driving transistor, the first capacitor cell, data write unit, power control unit, the second capacitor cell and resets control unit.Pixel-driving circuit provided by the invention is used to that pixel unit to be driven to show.

Description

A kind of pixel-driving circuit and its driving method, display device

Technical field

The present invention relates to display technology field more particularly to a kind of pixel-driving circuit and its driving method, display devices.

Background technology

OLED (Organic Light-Emitting Diode, Organic Light Emitting Diode) display device have self-luminous, Ultra-thin, many advantages, such as reaction speed is fast, contrast is high, visual angle is wide, be a kind of display device currently received significant attention.

And gradually increase with the size of OLED display device, the power supply in power supply circuit between power supply and each pixel The length of conducting wire increases, and leads to OLED display device at work, and the resistance drop (IR Drop) of power lead increases, and then Affect the uniformity of display device display brightness.Moreover, because the corresponding driving crystal of different pixels in OLED display device The threshold voltage of pipe is different, and equally the display brightness uniformity of display device can be had an impact.In addition, it is driven transistor Hysteresis effect influence, existing OLED display device can have short-term image retention, influence the visual experience of viewer.

Invention content

The purpose of the present invention is to provide a kind of pixel-driving circuit and its driving method, display devices, existing for solving Some pixel-driving circuits can not solve short-term image retention existing for display device and IR Drop, the threshold value electricity of driving transistor The problem of pressure has an impact the display brightness uniformity of display device.

To achieve these goals, the present invention provides following technical solution:

The first aspect of the present invention provides a kind of pixel-driving circuit, for driving luminescence unit, including:

Driving transistor, the first pole of the driving transistor are connect with luminescence unit;

First capacitor cell, the first end of first capacitor cell is connect with the grid of the driving transistor, described The second end of first capacitor cell is connect with the second pole of the driving transistor;

Data write unit connects respectively to the grid of corresponding line grid line, corresponding column data line and the driving transistor;

Power control unit, respectively with the second pole of power control terminal, power supply signal input and the driving transistor Connection, the power control unit are used for:Under the control of the power control terminal, the power supply signal that is turned on or off is controlled Connection between input terminal and the second pole of the driving transistor;

Second capacitor cell, the first end of second capacitor cell are connect with the second pole of the driving transistor, institute The second end for stating the second capacitor cell is connect with the power supply signal input;And

Reset control unit, respectively with reseting controling end, the grid of the driving transistor, reference voltage input terminal and institute State luminescence unit connection;The reset control unit is used for:Under the control of the reseting controling end, the institute that is turned on or off is controlled The connection between reference voltage input terminal and the grid of the driving transistor is stated, and controls the reference voltage that is turned on or off Connection between input terminal and the luminescence unit.

Further, the reset control unit includes:

First resets control module, brilliant with the reseting controling end, the reference voltage input terminal and the driving respectively The grid connection of body pipe;The first reset control module is used for:On-off is led in control under the control of the reseting controling end Open the connection between the reference voltage input terminal and the grid of the driving transistor;

Second reset control module, respectively with the reseting controling end, the reference voltage input terminal and the luminous list Member connection;The second reset control module is used for:The ginseng that is turned on or off is controlled under the control of the reseting controling end Examine the connection between voltage input end and the luminescence unit.

Further, the first reset control module includes first switch pipe, the grid of the first switch pipe and institute Reseting controling end connection is stated, the first pole of the first switch pipe is connect with the reference voltage input terminal, the first switch Second pole of pipe is connect with the grid of the driving transistor;

Described second, which resets control module, includes second switch pipe, and the grid of the second switch pipe is controlled with described reset End connection, the first pole of the second switch pipe are connect with the reference voltage input terminal, the second pole of the second switch pipe It is connect with the anode of the luminescence unit.

Further, the power control unit includes:

Third switching tube, the grid of the third switching tube are connect with the power control terminal, the third switching tube First pole is connect with the second pole of the driving transistor, the second pole and the power supply signal input of the third switching tube Connection.

Further, the data write unit includes:

4th switching tube, the grid of the 4th switching tube are connect with the corresponding line grid line, the 4th switching tube First pole is connected to the corresponding column data line, and the second pole of the 4th switching tube connects with the grid of the driving transistor It connects.

Further, the pixel-driving circuit further includes luminous controling unit, and the first of the driving transistor is extremely logical The luminous controling unit is crossed to connect with the luminescence unit;

The luminous controling unit respectively with light emitting control end, the first pole of the driving transistor and the luminescence unit Connection, the luminous controling unit are used for:The driving crystal that is turned on or off is controlled under the control at the light emitting control end Connection between first pole of pipe and the luminescence unit.

Further, the luminous controling unit includes:

5th switching tube, the grid of the 5th switching tube are connect with the light emitting control end, the 5th switching tube First pole is connect with the first pole of the driving transistor, and the second pole of the 5th switching tube is connect with the luminescence unit.

Based on the technical solution of above-mentioned pixel-driving circuit, the second aspect of the present invention provides a kind of pixel-driving circuit Driving method, applied to above-mentioned pixel-driving circuit, the driving method includes:In each display cycle,

In the reset period, power supply signal input input supply voltage Vdd, under the control of power control terminal, power supply control The connection between the power supply signal input and the second pole of the driving transistor is connected in unit control processed, and reference voltage is defeated Enter to hold input reference voltage Vref, under the control of reseting controling end, it is defeated to reset the control unit control conducting reference voltage Enter the connection between end and the grid of driving transistor, the driving transistor is in the conduction state, in reseting controling end Control under, the control unit that resets also controls the company be connected between the reference voltage input terminal and the luminescence unit It connects;

In the valve value compensation period, under the control of the power control terminal, described in the power control unit control disconnection Connection between power supply signal input and the second pole of the driving transistor, so that the driving transistor is become from being connected Cut-off, so that the current potential of the second pole of the driving transistor becomes Vref-Vth from Vdd, Vth is the driving crystal The threshold voltage of pipe;

The period is written in data, under the control of the reseting controling end, described in the reset control unit control disconnection Connection between reference voltage input terminal and the grid of the driving transistor, and the reset control unit also controls and disconnects institute State the connection between reference voltage input terminal and the luminescence unit;Corresponding column data line input data voltage Vdata, corresponding Under the control of row grid line, data write unit control is connected between the corresponding column data line and the grid of the driving transistor Connection so that the current potential of the grid of the driving transistor becomes Vdata from Vref, the second pole of the driving transistor Current potential accordingly changes under the coupling of the first capacitor cell and the second capacitor cell;

In light-emitting period, the power supply signal input input supply voltage Vdd, in the control of the power control terminal Under, the company between the power supply signal input and the second pole of the driving transistor is connected in the power control unit control It connects, under the control of the corresponding line grid line, the data write unit control disconnects the corresponding column data line and the drive Connection between the grid of dynamic transistor, under the coupling control of first capacitor cell and second capacitor cell, institute The current potential for stating the grid of driving transistor accordingly changes, and makes the driving transistor conducting that luminescence unit be driven to shine.

Further, when the pixel-driving circuit further includes luminous controling unit, the driving method further includes: The period is written in the data, and under the control at the light emitting control end, it is brilliant that the luminous controling unit control disconnects the driving Connection between first pole of body pipe and the luminescence unit, so that the luminescence unit is not sent out in the data write-in period Light.

Based on the technical solution of above-mentioned pixel-driving circuit, the third aspect of the present invention provides a kind of display device, including Above-mentioned pixel-driving circuit.

In pixel-driving circuit provided by the invention, the period is being resetted, the grid potential of driving transistor is become into Vref, The current potential of second pole of driving transistor is become into Vdd so that the grid of driving transistor and the voltage of the second pole are in admittedly Determine bias state, so that driving transistor be initialized, therefore, no matter each pixel unit shows black picture or white in former frame Color picture, driving transistor are the displays of the next frame by fixed bias state, so as to be improved well because magnetic hysteresis is imitated The short-term image retention problem that should be generated.

In the valve value compensation period, it is not connected to by the second pole for controlling driving transistor with power supply signal input, makes drive Dynamic transistor experience discharge process, until driving transistor is ended, the first capacitance is stored in by the threshold voltage of driving transistor In unit, data voltage is written in the data write-in period, the current potential of the grid of driving transistor is made to become Vdata from Vref, Simultaneously under the action of the first capacitor cell and the second capacitor cell, the jump in potential of the second pole of driving transistor is [C1/ (C1+C2)] (Vdata-Vref)+Vref-Vth, in light-emitting period, the current potential of the second pole of driving transistor becomes power supply electricity Pressure so that the jump in potential of the grid of driving transistor is [C2/ (C1+C2)] (Vdata-Vref)+Vth+Vdd, so that Driving transistor is connected, and driving transistor, which is connected and is operated in the driving current I that is generated during saturation state, is:k{[C2/(C1+ C2)](Vdata-Vref)}2, it is seen that driving current I is only related with data voltage Vdata and reference voltage Vref, and with driving The threshold voltage vt h and supply voltage Vdd of transistor are not related;Therefore, pixel-driving circuit provided by the invention In, the uniformity of driving current is improved, solves the threshold voltage of IR Drop and driving transistor well to display The influence that the display brightness uniformity of device generates, ensure that the uniformity of display device display brightness.

In addition, in pixel-driving circuit provided by the invention, additionally it is possible to by adjusting the first electricity in the first capacitor cell The capacitance C2 of the second capacitance in the capacitance C1 and the second capacitor cell of appearance adjusts the data that luminescence unit can work The range of voltage Vdata.

Description of the drawings

Attached drawing described herein is used to provide further understanding of the present invention, and forms the part of the present invention, this hair Bright illustrative embodiments and their description do not constitute improper limitations of the present invention for explaining the present invention.In the accompanying drawings:

Fig. 1 is the basic block diagram of pixel-driving circuit provided in an embodiment of the present invention;

Fig. 2 is the concrete structure diagram of pixel-driving circuit provided in an embodiment of the present invention;

Fig. 3 is the control sequential figure of pixel-driving circuit provided in an embodiment of the present invention;

The courses of work of Fig. 4 a~4d by the pixel-driving circuit that the embodiment of the present invention provides in a drive cycle Figure.

Reference numeral:

T1- first switch pipes, T2- second switch pipes, T3- third switching tubes,

The 4th switching tubes of T4-, the 5th switching tubes of T5-, DTFT- driving transistors,

ELVSS- low level signal input terminals, the first capacitances of C1-, the second capacitances of C2-,

Scan1- reseting controling ends, VREF- reference voltage input terminals, scan2- corresponding line grid lines,

The corresponding column data lines of Data-, scan3- power control terminals, VDD- power supply signal inputs,

Scan4- light emitting controls end, 1- power control units, 8- luminous controling units,

2- data write units, 3- driving units, 4- luminescence units,

5- reset control units, the first capacitor cells of 6-, the second capacitor cells of 7-,

P1- resets period, P2- valve value compensation periods, and the period is written in P3- data,

P4- light-emitting periods.

Specific embodiment

The pixel-driving circuit and its driving method, display device that embodiment provides in order to further illustrate the present invention, under Face is described in detail with reference to Figure of description.

It please refers to Fig.1 and Fig. 2, pixel-driving circuit provided in an embodiment of the present invention is used to drive luminescence unit 4, the pixel Driving circuit includes:Driving unit 3 (including driving transistor DTFT), the first capacitor cell 6, data write unit 2, power supply control Unit 1 processed, the second capacitor cell 7 and reset control unit 5;Wherein, the first pole of driving transistor DTFT connects with luminescence unit 4 It connects;The first end of first capacitor cell 6 is connect with the grid of driving transistor DTFT, the second end of the first capacitor cell 6 and drive The second pole connection of dynamic transistor DTFT;Data write unit 2 respectively to corresponding line grid line scan2, corresponding column data line Data It is connected with the grid of driving transistor DTFT;Power control unit 1 respectively with power control terminal scan3, power supply signal input VDD is connected with the second pole of driving transistor DTFT, and power control unit 1 is used for:Under the control of power control terminal scan3, Control the connection being turned on or off between power supply signal input VDD and the second pole of driving transistor DTFT;Second capacitance list The first end of member 7 is connect with the second pole of driving transistor DTFT, the second end and power supply signal input of the second capacitor cell 7 VDD connections;Control unit 5 is resetted to input with reseting controling end scan1, the grid of driving transistor DTFT, reference voltage respectively End VREF and luminescence unit 4 connect;Control unit 5 is resetted to be used for:Under the control of reseting controling end scan1, control conducting or The connection between the grid of reference voltage input terminal VREF and driving transistor DTFT is disconnected, and controls and is turned on or off with reference to electricity Press the connection between input terminal VREF and luminescence unit 4.

Fig. 3 and Fig. 4 a~4d are please referred to, above-mentioned pixel-driving circuit is in the course of work of a drive cycle:

Resetting period P1, as shown in fig. 4 a, power supply signal input VDD input supply voltage Vdd, in power control terminal Under the control of scan3, power control unit 1 controls the second pole of turn-on power signal input part VDD and driving transistor DTFT Between connection, the current potential of the second pole of driving transistor DTFT is made to become Vdd, reference voltage input terminal VREF inputs are with reference to electricity Vref is pressed, under the control of reseting controling end scan1, resets the control of control unit 5 conducting reference voltage input terminal VREF with driving Connection between the grid of dynamic transistor DTFT, makes the current potential of the grid of driving transistor DTFT become Vref, so that driving The grid of dynamic transistor DTFT and the voltage of the second pole are in fixed bias state, and driving transistor DTFT is connected, is threshold Value complement repays period P2 and prepares, and under the control of reseting controling end scan1, resets control unit 5 and also controls conducting reference voltage Connection between the anode of input terminal VREF and luminescence unit 4.As it can be seen that resetting period P1, can realize driving transistor The grid potential of DTFT becomes Vref, and the current potential of the second pole of driving transistor DTFT is become Vdd, thus by driving transistor DTFT is initialized.It is further to note that resetting period P1, in order to enable driving transistor DTFT is connected, drive should be met The turn-on condition of dynamic transistor DTFT, i.e. Vref-Vdd should be less than the threshold voltage vt h of driving transistor DTFT.In addition, it shines Unit 4 is chosen as OLED luminescent devices, and the anode of luminescence unit 4 is the anode of OLED, the cathode and low level signal of OLED Input terminal ELVSS connections, low level signal input terminal ELVSS can be connect with power cathode, for input low level signal, But it is not limited only to this.

In valve value compensation period P2, as shown in Figure 4 b, reference voltage input terminal VREF input reference voltage Vref are resetting Under the control of control terminal scan1, reset control unit 5 and continue control conducting reference voltage input terminal VREF and driving transistor Connection between the grid of DTFT makes the current potential of the grid of driving transistor DTFT remain Vref, in power control terminal scan3 Control under, power control unit 1 control power off signal input terminal VDD and driving transistor DTFT the second pole between Connection, makes the second pole of driving transistor DTFT be in floating state, so that driving transistor DTFT undergoes discharge process, Driving transistor DTFT becomes ending from being connected, so that the current potential of the second pole of driving transistor DTFT is become from Vdd Vref-Vth, Vth are the threshold voltage of driving transistor DTFT;Under the control of reseting controling end scan1, control unit is resetted 5 continue the connection between control conducting reference voltage input terminal VREF and the anode of luminescence unit 4;It should be noted that at this When valve value compensation period P2, driving transistor DTFT undergo discharge process, the current potential of the second pole of driving transistor DTFT is by Vdd It begins to decline, until when falling to Vref-Vth, is unsatisfactory for the turn-on condition of driving transistor DTFT so that driving transistor DTFT ends.

Period P3 is written in data, as illustrated in fig. 4 c, under the control of reseting controling end scan1, resets control unit 5 and controls System disconnects the connection between the grid of reference voltage input terminal VREF and driving transistor DTFT, and resets control unit 5 and also control System disconnects the connection between reference voltage input terminal VREF and the anode of luminescence unit 4, in the control of power control terminal scan3 Under, power control unit 1 continues to control the company between the second pole of power off signal input terminal VDD and driving transistor DTFT It connects, corresponding column data line Data input datas voltage Vdata, under the control of corresponding line grid line scan2, data write unit 2 The connection between the grid of corresponding column data line Data and driving transistor DTFT is connected in control, so that driving transistor DTFT The current potential of grid becomes Vdata from Vref, under the coupling control of the first capacitor cell 6 and the second capacitor cell 7, drives crystal The current potential of the second pole of pipe DTFT becomes [C1/ (C1+C2)] (Vdata-Vref)+Vref-Vth from Vref-Vth;Specifically, it drives When the current potential of the grid of dynamic transistor DTFT becomes Vdata from Vref, the variable quantity of the current potential of the grid of driving transistor DTFT For Vdata-Vref, according to charge conservation theorem, the current potential of the second pole of driving transistor DTFT becomes [C1/ (C1+C2)] (Vdata-Vref)+Vref-Vth。

In light-emitting period P4, as shown in figure 4d, under the control of reseting controling end scan1, reset control unit 5 and continue to control System disconnects the connection between the grid of reference voltage input terminal VREF and driving transistor DTFT, and resets control unit 5 and continue Control disconnects the connection between reference voltage input terminal VREF and the anode of luminescence unit 4, power supply signal input VDD input electricity Source voltage Vdd, under the control of power control terminal scan3, power control unit 1 control turn-on power signal input part VDD with Connection between the second pole of driving transistor DTFT makes the current potential of the second pole of driving transistor DTFT by [C1/ (C1+C2)] (Vdata-Vref)+Vref-Vth becomes Vdd, and under the control of corresponding line grid line scan2, the control of data write unit 2 disconnects Connection between the grid of corresponding column data line Data and driving transistor DTFT, in the first capacitor cell 6 and the second capacitance list Under the coupling control of member 7, the current potential of the grid of driving transistor DTFT is become [C2/ (C1+C2)] (Vdata-Vref) from Vdata + Vth+Vdd makes driving transistor DTFT conductings that luminescence unit 4 be driven to shine.Specifically, the second of driving transistor DTFT The current potential of pole becomes Vdd, the electricity of the second pole of driving transistor DTFT from [C1/ (C1+C2)] (Vdata-Vref)+Vref-Vth The variable quantity of position is Vdd- [C1/ (C1+C2)] (Vdata-Vref)-Vref+Vth according to charge conservation theorem, driving transistor The current potential of the grid of DTFT becomes Vdata+Vdd- [C1/ (C1+C2)] (Vdata-Vref)-Vref+Vth, as:[C2/(C1+ C2)](Vdata-Vref)+Vth+Vdd。

According to the concrete structure of above-mentioned pixel-driving circuit and pixel-driving circuit a drive cycle the course of work It is found that in pixel-driving circuit provided in an embodiment of the present invention, period P1 is being resetted, by the grid potential of driving transistor DTFT Become Vref, the current potential of the second pole of driving transistor DTFT is become into Vdd so that the grid of driving transistor DTFT and second The voltage of pole is in fixed bias state, and so as to which driving transistor DTFT be initialized, therefore, no matter each pixel unit is preceding One frame shows that black picture or white picture, driving transistor DTFT are the displays of the next frame by fixed bias state, So as to improve the short-term image retention problem generated by hysteresis effect well.

In valve value compensation period P2, by control the second pole of driving transistor DTFT with power supply signal input VDD not Connection makes driving transistor DTFT undergo discharge process, until driving transistor DTFT ends, by the threshold of driving transistor DTFT Threshold voltage is stored in the first capacitor cell 6, and data voltage is written in data write-in period P3, makes driving transistor DTFT's The current potential of grid becomes Vdata from Vref, while under the action of the first capacitor cell 6 and the second capacitor cell 7, drives crystal The jump in potential of the second pole of pipe DTFT is [C1/ (C1+C2)] (Vdata-Vref)+Vref-Vth, in light-emitting period P4, driving The current potential of the second pole of transistor DTFT becomes supply voltage Vdd so that the jump in potential of the grid of driving transistor DTFT is [C2/ (C1+C2)] (Vdata-Vref)+Vth+Vdd, so that driving transistor DTFT is connected, driving transistor at this time Voltage Vgs between the grid of DTFT and the second pole of driving transistor DTFT is:

Vgs=[C2/ (C1+C2)] (Vdata-Vref)+Vth formula one

Driving transistor DTFT is connected and is operated in the driving current I that is generated during saturation state:

I=k (Vgs-Vth)2Formula two

Formula one is substituted into formula two to obtain:

I=k { [C2/ (C1+C2)] (Vdata-Vref) }2Formula three

In formula three, k is constant.

Understand that driving current I is only related with data voltage Vdata and reference voltage Vref by formula three, and with driving crystal The threshold voltage vt h and supply voltage Vdd of pipe DTFT is not related;Therefore, pixel driver provided in an embodiment of the present invention In circuit, the uniformity of driving current is improved, the threshold value electricity for solving IR Drop and driving transistor DTFT well The influence generated to the display brightness uniformity of display device is pressed, ensure that the uniformity of display device display brightness.

In addition, in pixel-driving circuit provided in an embodiment of the present invention, additionally it is possible to by adjusting in the first capacitor cell The capacitance C2 of the second capacitance in the capacitance C1 and the second capacitor cell of first capacitance adjusts the data of pixel-driving circuit The range of voltage Vdata.

The pixel-driving circuit provided by taking specific circuit structure as an example the present embodiment below is introduced.Continuing with Include referring to Fig.2, resetting control unit 5:First resets control module, is inputted respectively with reseting controling end scan1, reference voltage End VREF is connected with the grid of driving transistor DTFT;First reset control module is used for:In the control of reseting controling end scan1 It is lower to control the connection being turned on or off between reference voltage input terminal VREF and the grid of driving transistor DTFT;Specifically, exist Period P1 and valve value compensation period P2 is resetted, under the control of reseting controling end scan1, control conducting reference voltage input terminal Connection between the grid of VREF and driving transistor DTFT;Period P3 and light-emitting period P4 is written in data, is controlled resetting Under the control for holding scan1, control disconnects the connection between the grid of reference voltage input terminal VREF and driving transistor DTFT;

Second reset control module, respectively with reseting controling end scan1, reference voltage input terminal VREF and luminescence unit 4 Connection;Second reset control module is used for:The reference voltage input that is turned on or off is controlled under the control of reseting controling end scan1 Hold the connection between VREF and luminescence unit 4.Specifically, period P1 and valve value compensation period P2 is being resetted, in reseting controling end Under the control of scan1, the connection between control conducting reference voltage input terminal VREF and the anode of luminescence unit 4;It is write in data Enter period P3 and light-emitting period P4, under the control of reseting controling end scan1, control disconnects reference voltage input terminal VREF and hair Connection between the anode of light unit 4.

Further, the first reset control module includes first switch pipe T1, and the grid of first switch pipe T1 is controlled with resetting Scan1 connections in end processed, the first pole of first switch pipe T1 are connect with reference voltage input terminal VREF, and the second of first switch pipe T1 Pole is connect with the grid of driving transistor DTFT;Second, which resets control module, includes second switch pipe T2, second switch pipe T2's Grid is connect with reseting controling end scan1, and the first pole of second switch pipe T2 is connect with reference voltage input terminal VREF, and second opens The second pole for closing pipe T2 is connect with the anode of luminescence unit 4.

Further, power control unit 1 includes third switch transistor T 3, the grid and power control terminal of third switch transistor T 3 Scan3 connections, the first pole of third switch transistor T 3 are connect with the second pole of driving transistor DTFT, and the second of third switch transistor T 3 Pole is connect with power supply signal input VDD.

Specifically, period P1 and light-emitting period P4, the third switch transistor T 3 under the control of power control terminal scan3 are being resetted Conducting so that the second pole of driving transistor DTFT is connect with power supply signal input VDD;In valve value compensation period P2 and data Period P3 is written, third switch transistor T 3 is ended under the control of power control terminal scan3 so that the second of driving transistor DTFT Pole is not connected to power supply signal input VDD.

Further, data write unit 2 includes the 4th switch transistor T 4, grid and the corresponding line grid line of the 4th switch transistor T 4 Scan2 connections, the first pole of the 4th switch transistor T 4 are connect with corresponding column data line Data, and the second pole of the 4th switch transistor T 4 is with driving The grid connection of dynamic transistor DTFT.

Specifically, period P3 is written in data, the 4th switch transistor T 4 is connected under the control of corresponding line grid line scan2, makes The grid for obtaining driving transistor DTFT is connect with corresponding column data line Data, by the corresponding data voltages of corresponding column data line Data Write-in;Period P1, valve value compensation period P2 and light-emitting period P4 are being resetted, the 4th opens under the control of corresponding line grid line scan2 Close pipe T4 cut-offs so that the grid of driving transistor DTFT is not connected to corresponding column data line Data.

Further, the first capacitor cell 6 includes the first capacitance, and the first end of the first capacitance is with driving transistor DTFT's Grid connects, and the second end of the first capacitance is connect with the second pole of driving transistor DTFT;Second capacitor cell 7 includes the second electricity Hold, the first end of the second capacitance is connect with the second pole of driving transistor DTFT, and the second end and power supply signal of the second capacitance are defeated Enter VDD is held to connect.

Further, the pixel-driving circuit that above-described embodiment provides further includes luminous controling unit 8, driving transistor The first pole of DTFT is connect by luminous controling unit 8 with luminescence unit 4;Specifically, luminous controling unit 8 respectively with luminous control End scan4 processed, driving transistor DTFT the first pole connected with the anode of luminescence unit 4, luminous controling unit 8 is used for:It is sending out The company being turned on or off between the first pole of driving transistor DTFT and luminescence unit 4 is controlled under the control of photocontrol end scan4 It connects.In more detail, period P3 is written in data, under the control of light emitting control end scan4, the control of luminous controling unit 8 is disconnected Open the connection between the first pole of driving transistor DTFT and the anode of luminescence unit 4;Resetting period P1, valve value compensation period P2 and light-emitting period P4, under the control of light emitting control end scan4, the control conducting driving transistor of luminous controling unit 8 DTFT The first pole and luminescence unit 4 anode between connection.

Further, above-mentioned luminous controling unit 8 includes the 5th switch transistor T 5, and the grid of the 5th switch transistor T 5 is with shining Control terminal scan4 connections, the first pole of the 5th switch transistor T 5 are connect with the first pole of driving transistor DTFT, the 5th switch transistor T 5 The second pole connect with the anode of luminescence unit 4.Period P3 is written in data, the 5th under the control of light emitting control end scan4 Switch transistor T 5 is ended so that is not connected between the first pole of driving transistor DTFT and the anode of luminescence unit 4;Resetting the period P1, valve value compensation period P2 and light-emitting period P4, the 5th switch transistor T 5 is connected under the control of light emitting control end scan4 so that It is connected between the first pole of driving transistor DTFT and the anode of luminescence unit 4.It is noted that above-mentioned light emitting control end scan4 The signal of input can be identical with the signal that corresponding line grid line scan2 is inputted.

The control of period P3 can be written in data in the luminous controling unit 8 that the pixel-driving circuit that above-described embodiment provides includes It is not connected between the first pole of driving transistor DTFT processed and the anode of luminescence unit 4 so that be in the period luminescence unit 4 Period P3 is written so as to avoid in data in non-light emitting state, and the display device caused by luminescence unit 4 is abnormal luminous goes out The problem of existing abnormal show.

It is worth noting that, pixel-driving circuit of the present embodiment only by taking above-mentioned specific circuit structure as an example to being provided It is introduced, in other embodiments of the invention, data write unit 2, power control unit 1, the hair of pixel-driving circuit Light unit 4, reset control unit 5, the first capacitor cell 6, the second capacitor cell 7 and luminous controling unit 8 can also be used respectively Other structures realize that this will not be detailed here.In addition, the number of devices employed in above-mentioned pixel-driving circuit is less, pixel Area shared by driving circuit is smaller, is more advantageous to increasing the pixel quantity of display device, improves the display effect of display device.

In addition, above-mentioned driving transistor DTFT and each switching tube may be used thin film transistor (TFT), field-effect tube or its The identical device of his characteristic.In embodiments of the present invention, for distinguish driving transistor DTFT and each switching tube except grid it A wherein pole is known as the first pole by outer the two poles of the earth, and another pole is known as the second pole.In practical operation, described first extremely can be Drain electrode, described second extremely can be source electrode;Alternatively, described first extremely can be source electrode, described second extremely can be drain electrode.

In the present embodiment with driving transistor DTFT, 3 and the 5th switch transistor T 5 of third switch transistor T for P-type transistor, the One switch transistor T 1, second switch pipe T2 and the 4th switch transistor T 4 are N-type transistor, and first extremely drains, the second extremely source electrode For illustrate.Above-mentioned driving transistor DTFT and each switching tube can also select other types of transistor, and drive Transistor DTFT and each switching tube for other types of transistor circuit design also within the protection domain of the application.

The embodiment of the present invention additionally provides a kind of driving method of pixel-driving circuit, for above-described embodiment to be driven to provide Pixel-driving circuit, in each display cycle, which includes:

Resetting period P1, as shown in fig. 4 a, power supply signal input VDD input supply voltage Vdd, in power control terminal Under the control of scan3, power control unit 1 controls the second pole of turn-on power signal input part VDD and driving transistor DTFT Between connection, the current potential of the second pole of driving transistor DTFT is made to become Vdd, reference voltage input terminal VREF inputs are with reference to electricity Vref is pressed, under the control of reseting controling end scan1, resets the control of control unit 5 conducting reference voltage input terminal VREF with driving Connection between the grid of dynamic transistor DTFT, makes the current potential of the grid of driving transistor DTFT become Vref, so that driving The grid of dynamic transistor DTFT and the voltage of the second pole are in fixed bias state, and driving transistor DTFT is connected, is threshold Value complement repays period P2 and prepares, and under the control of reseting controling end scan1, resets control unit 5 and also controls conducting reference voltage Connection between the anode of input terminal VREF and luminescence unit 4.Therefore, period P1 is being resetted, can realized driving transistor The grid potential of DTFT becomes Vref, the current potential of the second pole of driving transistor DTFT is become Vdd, by driving transistor DTFT Initialization.It is further to note that resetting period P1, in order to enable driving transistor DTFT is connected, it is brilliant that driving should be met The turn-on condition of body pipe DTFT, i.e. Vref-Vdd should be less than the threshold voltage vt h of driving transistor DTFT.

In valve value compensation period P2, as shown in Figure 4 b, reference voltage input terminal VREF input reference voltage Vref are resetting Under the control of control terminal scan1, reset control unit 5 and continue control conducting reference voltage input terminal VREF and driving transistor Connection between the grid of DTFT makes the current potential of the grid of driving transistor DTFT remain Vref, in power control terminal scan3 Control under, power control unit 1 control power off signal input terminal VDD and driving transistor DTFT the second pole between Connection, makes the second pole of driving transistor DTFT be in floating state, so that driving transistor DTFT undergoes discharge process, Driving transistor DTFT becomes ending from being connected, so that the current potential of the second pole of driving transistor DTFT is become from Vdd Vref-Vth, Vth are the threshold voltage of driving transistor DTFT;Under the control of reseting controling end scan1, control unit is resetted 5 continue the connection between control conducting reference voltage input terminal VREF and the anode of luminescence unit 4;It should be noted that at this When valve value compensation period P2, driving transistor DTFT undergo discharge process, the current potential of the second pole of driving transistor DTFT is by Vdd It begins to decline, until when falling to Vref-Vth, is unsatisfactory for the turn-on condition of driving transistor DTFT so that driving transistor DTFT ends.

Period P3 is written in data, as illustrated in fig. 4 c, under the control of reseting controling end scan1, resets control unit 5 and controls System disconnects the connection between the grid of reference voltage input terminal VREF and driving transistor DTFT, and resets control unit 5 and also control System disconnects the connection between reference voltage input terminal VREF and the anode of luminescence unit 4, in the control of power control terminal scan3 Under, power control unit 1 continues to control the company between the second pole of power off signal input terminal VDD and driving transistor DTFT It connects, corresponding column data line Data input datas voltage Vdata, under the control of corresponding line grid line scan2, data write unit 2 The connection between the grid of corresponding column data line Data and driving transistor DTFT is connected in control, so that driving transistor DTFT The current potential of grid becomes Vdata from Vref, under the coupling control of the first capacitor cell 6 and the second capacitor cell 7, drives crystal The current potential of the second pole of pipe DTFT becomes [C1/ (C1+C2)] (Vdata-Vref)+Vref-Vth from Vref-Vth;Specifically, it drives When the current potential of the grid of dynamic transistor DTFT becomes Vdata from Vref, the variable quantity of the current potential of the grid of driving transistor DTFT For Vdata-Vref, according to charge conservation theorem, the current potential of the second pole of driving transistor DTFT becomes [C1/ (C1+C2)] (Vdata-Vref)+Vref-Vth。

In light-emitting period P4, as shown in figure 4d, under the control of reseting controling end scan1, reset control unit 5 and continue to control System disconnects the connection between the grid of reference voltage input terminal VREF and driving transistor DTFT, and resets control unit 5 and continue Control disconnects the connection between reference voltage input terminal VREF and the anode of luminescence unit 4, power supply signal input VDD input electricity Source voltage Vdd, under the control of power control terminal scan3, power control unit 1 control turn-on power signal input part VDD with Connection between the second pole of driving transistor DTFT makes the current potential of the second pole of driving transistor DTFT by [C1/ (C1+C2)] (Vdata-Vref)+Vref-Vth becomes Vdd, and under the control of corresponding line grid line scan2, the control of data write unit 2 disconnects Connection between the grid of corresponding column data line Data and driving transistor DTFT, in the first capacitor cell 6 and the second capacitance list Under the coupling control of member 7, the current potential of the grid of driving transistor DTFT is become [C2/ (C1+C2)] (Vdata-Vref) from Vdata + Vth+Vdd makes driving transistor DTFT conductings that luminescence unit 4 be driven to shine.Specifically, the second of driving transistor DTFT The current potential of pole becomes Vdd, the electricity of the second pole of driving transistor DTFT from [C1/ (C1+C2)] (Vdata-Vref)+Vref-Vth The variable quantity of position is Vdd- [C1/ (C1+C2)] (Vdata-Vref)-Vref+Vth according to charge conservation theorem, driving transistor The current potential of the grid of DTFT becomes Vdata+Vdd- [C1/ (C1+C2)] (Vdata-Vref)-Vref+Vth, as:[C2/(C1+ C2)](Vdata-Vref)+Vth+Vdd。

During the pixel-driving circuit for above-described embodiment being driven to provide using driving method provided in an embodiment of the present invention, multiple Position period P1, becomes Vref by the grid potential of driving transistor DTFT, and the current potential of the second pole of driving transistor DTFT is become For Vdd so that the grid of driving transistor DTFT and the voltage of the second pole are in fixed bias state, so as to drive crystal Pipe DTFT is initialized, and therefore, no matter each pixel unit shows black picture or white picture, driving transistor DTFT in former frame It is the display of the next frame by fixed bias state, is asked so as to improve the short-term image retention generated by hysteresis effect well Topic.

In valve value compensation period P2, by control the second pole of driving transistor DTFT with power supply signal input VDD not Connection makes driving transistor DTFT undergo discharge process, until driving transistor DTFT ends, by the threshold of driving transistor DTFT Threshold voltage is stored in the first capacitor cell 6, and data voltage is written in data write-in period P3, makes driving transistor DTFT's The current potential of grid becomes Vdata from Vref, while under the action of the first capacitor cell 6 and the second capacitor cell 7, drives crystal The jump in potential of the second pole of pipe DTFT is [C1/ (C1+C2)] (Vdata-Vref)+Vref-Vth, in light-emitting period P4, driving The current potential of the second pole of transistor DTFT becomes supply voltage Vdd so that the jump in potential of the grid of driving transistor DTFT is [C2/ (C1+C2)] (Vdata-Vref)+Vth+Vdd, so that driving transistor DTFT is connected, driving transistor at this time Voltage Vgs=[C2/ (C1+C2)] (Vdata-Vref) between the grid of DTFT and the second pole of driving transistor DTFT+ Vth, driving transistor DTFT are connected and are operated in the driving current I that is generated during saturation state:I=k { [C2/ (C1+C2)] (Vdata-Vref)}2, wherein k is constant.

As it can be seen that driving current I is only related with data voltage Vdata and reference voltage Vref, and with driving transistor DTFT Threshold voltage vt h and supply voltage Vdd it is not related;Therefore, it is driven using driving method provided in an embodiment of the present invention When moving above-mentioned pixel-driving circuit, the uniformity of driving current is improved, solves IR Drop and driving crystal well The influence that the threshold voltage of pipe DTFT generates the display brightness uniformity of display device, ensure that display device display brightness Uniformity.

Further, when pixel-driving circuit further includes luminous controling unit 8, driving method further includes:It is write in data Enter period P3, under the control of light emitting control end scan4, the control of luminous controling unit 8 disconnects the first of driving transistor DTFT Connection between pole and luminescence unit 4, so that luminescence unit 4 does not shine in data write-in period P3;Resetting period P1, threshold value Period P2 and light-emitting period P4 is compensated, under the control of light emitting control end scan4, the control conducting driving of luminous controling unit 8 is brilliant Connection between the first pole of body pipe DTFT and the anode of luminescence unit 4.

In the driving method for the pixel-driving circuit that above-described embodiment provides, luminous controling unit 8 can be written in data It is not connected between the first pole of period P3 control driving transistors DTFT and the anode of luminescence unit 4 so that shine in the period Unit 4 is in non-light emitting state, period P3 is written so as to avoid in data, caused by luminescence unit 4 is abnormal luminous There is the problem of abnormal show in display device.

Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment Point just to refer each other.For embodiment of the method, since it is substantially similar to product embodiments, so describing Fairly simple, related part illustrates referring to the part of product embodiments.

The embodiment of the present invention additionally provides a kind of display device, the pixel-driving circuit provided including above-described embodiment.

Since the pixel-driving circuit that above-described embodiment provides can solve the threshold value of IR Drop and driving transistor The influence that voltage generates the display brightness uniformity of display device, the uniformity of guarantee display device display brightness, while on The pixel-driving circuit for stating embodiment offer also is able to improve the short-term image retention problem generated by hysteresis effect;Therefore the present invention is real Display device that example also provides is applied in the pixel-driving circuit provided including above-described embodiment, can not only ensure display brightness Uniformity, additionally it is possible to improve the short-term image retention problem generated by hysteresis effect.

It should be noted that the display device that the present embodiment is provided can be OLED (Organic Light- Emitting Diode, Organic Light Emitting Diode) panel, mobile phone, tablet computer, television set, display, laptop, number Any products or component with display function such as code photo frame, navigator.

In the description of the above embodiment, particular features, structures, materials, or characteristics can be in any one or more It is combined in an appropriate manner in a embodiment or example.

The above description is merely a specific embodiment, but protection scope of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in change or replacement, should all contain Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.

Claims (10)

1. a kind of pixel-driving circuit, for driving luminescence unit, which is characterized in that including:
Driving transistor, the first pole of the driving transistor are connect with luminescence unit;
First capacitor cell, the first end of first capacitor cell are connect with the grid of the driving transistor, and described first The second end of capacitor cell is connect with the second pole of the driving transistor;
Data write unit connects respectively to the grid of corresponding line grid line, corresponding column data line and the driving transistor;
Power control unit, respectively the second pole with power control terminal, power supply signal input and the driving transistor connect, The power control unit is used for:Under the control of the power control terminal, the power supply signal input that is turned on or off is controlled Connection between end and the second pole of the driving transistor;
Second capacitor cell, the first end of second capacitor cell are connect with the second pole of the driving transistor, and described The second end of two capacitor cells is connect with the power supply signal input;And
Reset control unit, respectively with reseting controling end, the grid of the driving transistor, reference voltage input terminal and the hair Light unit connects;The reset control unit is used for:Under the control of the reseting controling end, the ginseng that is turned on or off is controlled The connection between voltage input end and the grid of the driving transistor is examined, and controls the reference voltage input that is turned on or off Connection between end and the luminescence unit.
2. pixel-driving circuit according to claim 1, which is characterized in that the reset control unit includes:
First reset control module, respectively with the reseting controling end, the reference voltage input terminal and the driving transistor Grid connection;The first reset control module is used for:The institute that is turned on or off is controlled under the control of the reseting controling end State the connection between reference voltage input terminal and the grid of the driving transistor;
Second resets control module, connects respectively with the reseting controling end, the reference voltage input terminal and the luminescence unit It connects;The second reset control module is used for:Control is turned on or off described with reference to electricity under the control of the reseting controling end Press the connection between input terminal and the luminescence unit.
3. pixel-driving circuit according to claim 2, which is characterized in that described first, which resets control module, includes first Switching tube, the grid of the first switch pipe are connect with the reseting controling end, the first pole of the first switch pipe with it is described Reference voltage input terminal connects, and the second pole of the first switch pipe is connect with the grid of the driving transistor;
Described second, which resets control module, includes second switch pipe, and grid and the reseting controling end of the second switch pipe connect It connects, the first pole of the second switch pipe is connect with the reference voltage input terminal, the second pole of the second switch pipe and institute State the anode connection of luminescence unit.
4. pixel-driving circuit according to claim 1, which is characterized in that the power control unit includes:
Third switching tube, the grid of the third switching tube are connect with the power control terminal, and the first of the third switching tube Pole is connect with the second pole of the driving transistor, and the second pole and the power supply signal input of the third switching tube connect It connects.
5. pixel-driving circuit according to claim 1, which is characterized in that the data write unit includes:
4th switching tube, the grid of the 4th switching tube are connect with the corresponding line grid line, and the first of the 4th switching tube Pole is connected to the corresponding column data line, and the second pole of the 4th switching tube is connect with the grid of the driving transistor.
6. according to Claims 1 to 5 any one of them pixel-driving circuit, which is characterized in that the pixel-driving circuit is also Including luminous controling unit, the first pole of the driving transistor is connected by the luminous controling unit and the luminescence unit It connects;
The luminous controling unit connects respectively with light emitting control end, the first pole of the driving transistor and the luminescence unit It connects, the luminous controling unit is used for:The driving transistor that is turned on or off is controlled under the control at the light emitting control end The first pole and the luminescence unit between connection.
7. pixel-driving circuit according to claim 6, which is characterized in that the luminous controling unit includes:
5th switching tube, the grid of the 5th switching tube are connect with the light emitting control end, and the first of the 5th switching tube Pole is connect with the first pole of the driving transistor, and the second pole of the 5th switching tube is connect with the luminescence unit.
8. a kind of driving method of pixel-driving circuit, which is characterized in that applied to such as claim 1~7 any one of them Pixel-driving circuit, the driving method include:In each display cycle,
The period is being resetted, power supply signal input input supply voltage Vdd, under the control of power control terminal, power supply control is single The connection between the power supply signal input and the second pole of the driving transistor, reference voltage input terminal is connected in member control Input reference voltage Vref under the control of reseting controling end, resets control unit control and the reference voltage input terminal is connected Connection between the grid of driving transistor, the driving transistor is in the conduction state, in the control of reseting controling end Under system, the control unit that resets also controls the connection be connected between the reference voltage input terminal and the luminescence unit;
In the valve value compensation period, under the control of the power control terminal, the power control unit control disconnects the power supply Connection between signal input part and the second pole of the driving transistor, so that the driving transistor becomes cutting from being connected Only, so that the current potential of the second pole of the driving transistor becomes Vref-Vth from Vdd, Vth is the driving transistor Threshold voltage;
The period is written in data, under the control of the reseting controling end, the reset control unit control disconnects the reference Connection between voltage input end and the grid of the driving transistor, and the reset control unit also controls and disconnects the ginseng Examine the connection between voltage input end and the luminescence unit;Corresponding column data line input data voltage Vdata, in corresponding line grid Under the control of line, the company between the corresponding column data line and the grid of the driving transistor is connected in data write unit control It connects, so that the current potential of the grid of the driving transistor becomes Vdata, the current potential of the second pole of the driving transistor from Vref Accordingly change under the coupling of the first capacitor cell and the second capacitor cell;
In light-emitting period, the power supply signal input input supply voltage Vdd, under the control of the power control terminal, institute The connection between the power control unit control conducting power supply signal input and the second pole of the driving transistor is stated, Under the control of the corresponding line grid line, the data write unit control disconnects the corresponding column data line and the driving crystal Connection between the grid of pipe, under the coupling control of first capacitor cell and second capacitor cell, the driving The current potential of the grid of transistor accordingly changes, and makes the driving transistor conducting that luminescence unit be driven to shine.
9. the driving method of pixel-driving circuit according to claim 8, which is characterized in that when the pixel-driving circuit When further including luminous controling unit, the driving method further includes:The period is written in the data, at the light emitting control end Under control, the luminous controling unit control disconnects the company between the first pole of the driving transistor and the luminescence unit It connects, so that the luminescence unit does not shine in the data write-in period.
10. a kind of display device, which is characterized in that including claim 1~7 any one of them pixel-driving circuit.
CN201810214416.1A 2018-03-15 2018-03-15 A kind of pixel-driving circuit and its driving method, display device CN108154845A (en)

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