CN108010489B - A kind of OLED driver circuit and its display device - Google Patents

A kind of OLED driver circuit and its display device Download PDF

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Publication number
CN108010489B
CN108010489B CN201711231959.6A CN201711231959A CN108010489B CN 108010489 B CN108010489 B CN 108010489B CN 201711231959 A CN201711231959 A CN 201711231959A CN 108010489 B CN108010489 B CN 108010489B
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China
Prior art keywords
film transistor
tft
thin film
grid
source electrode
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CN201711231959.6A
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Chinese (zh)
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CN108010489A (en
Inventor
赖谷皇
戴超
王志军
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南京中电熊猫平板显示科技有限公司
南京中电熊猫液晶显示科技有限公司
南京华东电子信息科技股份有限公司
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Priority to CN201711231959.6A priority Critical patent/CN108010489B/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]
    • G09G3/3225Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element

Abstract

The invention discloses a kind of OLED driver circuit, which includes: the 11st thin film transistor (TFT) for opening and transmitting data voltage according to scanning voltage, the 12nd thin film transistor (TFT) for generating driving current, whether is transferred to the 13rd thin film transistor (TFT) of Organic Light Emitting Diode anode according to triggering driving signal control driving current and provides the Organic Light Emitting Diode of light;OLED driver circuit of the invention controls the bright dark time scale of Organic Light Emitting Diode using externally input triggering driving signal, reach under same current driving, show the function of different grey menus, it can be to avoid the picture unevenness problem when showing low grey menu, due to caused by driving current is lower, electric current is unstable;The invention also discloses the display devices of the application OLED driver circuit.

Description

A kind of OLED driver circuit and its display device

Technical field

The present invention relates to field of display technology more particularly to a kind of OLED driver circuit and its display dresses It sets.

Background technique

Organic light-emitting display device utilizes Organic Light Emitting Diode (Organic Light Emitting Diode, OLED) Brought high contrast, high colour gamut, wide viewing angle, low energy consumption and its more frivolous advantage are favored by market.OLED shines former Reason is briefly are as follows: electronics that yin-yang the two poles of the earth respectively provide and hole combine in luminescent layer under the action of extra electric field and form excitation Son, exciton returns to ground state and issues photon, therefore OLED is a kind of galvanoluminescence device, by the circuit control electricity in semiconductor backplate Size is flowed, and then controls light emission luminance.

A kind of OLED drive of the prior art is as shown in Figure 1, the OLED drive includes criss-cross scanning Line and data line and the pixel region limited by scan line and data line intersection, interior be equipped with of pixel region are located at scan line sum number According to the 11st thin film transistor (TFT) T11, the 12nd thin film transistor (TFT) T12 and the Organic Light Emitting Diode OLED of line infall.When Scan line by open order pass to the 11st thin film transistor (TFT) T11 when, the 11st thin film transistor (TFT) T11 open, and give the tenth Two thin film transistor (TFT) T12 assign opening order, since the drain electrode of the 12nd thin film transistor (TFT) T12 is connected to the supply voltage of high potential VDD, and source electrode is connected to the anode of OLED, therefore the 12nd thin film transistor (TFT) T12 generates electric current driving OLED and shines.

However, this OLED pixel driving circuit is more simple, OLED light-emitting mode is electric current driving, therefore can not effectively be avoided Since driving current is lower under low ash scalariform condition, and caused by electric current wild effect, often there is unevenness in low grey menu (Mura)。

Summary of the invention

In order to solve the above technical problems, the invention discloses a kind of OLED driver circuit, the organic light emission Diode drive circuit controls the bright dark time scale of Organic Light Emitting Diode using externally input triggering driving signal, reaches Under same current driving, show the purpose of different grey menus, can to avoid when showing low ash rank, due to driving current compared with Low, the unstable caused picture unevenness problem of electric current.The invention also discloses apply the OLED driver circuit Display device.

Technical solution provided by the invention is as follows:

The invention discloses a kind of OLED driver circuit, which includes:

11st thin film transistor (TFT), the 12nd thin film transistor (TFT), the 13rd thin film transistor (TFT) and Organic Light Emitting Diode;

11st thin film transistor (TFT), opens or closes according to scanning voltage, and data voltage is transferred to the tenth when opening Two thin film transistor (TFT)s, the 12nd thin film transistor (TFT) of control open or close;

12nd thin film transistor (TFT) generates driving circuit when opening and is transferred to the 13rd thin film transistor (TFT);

13rd thin film transistor (TFT) is opened or closed according to externally input triggering driving signal, controls the 12nd film Whether driving circuit caused by transistor is transferred to Organic Light Emitting Diode;

Organic Light Emitting Diode generates light after receiving the driving circuit of the 13rd thin film transistor (TFT) transmission.

Preferably, the grid of the 11st thin film transistor (TFT) connects scan line, the drain electrode connection number of the 11st thin film transistor (TFT) According to line, the source electrode of the 11st thin film transistor (TFT) connects the grid of the 12nd thin film transistor (TFT);

The source electrode connection the 13rd of the drain electrode input supply voltage of 12nd thin film transistor (TFT), the 12nd thin film transistor (TFT) is thin The drain electrode of film transistor;

The grid of 13rd thin film transistor (TFT) inputs the triggering driving signal, the source electrode connection of the 13rd thin film transistor (TFT) Organic Light Emitting Diode;

Organic Light Emitting Diode includes anode and cathode, and anode connects the source electrode of the 13rd thin film transistor (TFT), cathode input Power supply negative pressure.

The invention also discloses a kind of organic light-emitting display device, which includes: criss-cross Scan line and data line and the multiple pixel regions limited are intersected by scan line and data line, every horizontal scanning line is by scanning voltage Its corresponding pixel region is inputted, data voltage is inputted its corresponding pixel region by each row of data line;

Each pixel region is equipped with OLED driver circuit described in above-mentioned any one, the organic light emission Display device further includes triggering the triggering driving circuit that drive circuit unit is constituted by N (N >=2, and N is integer) grade;Every grade institute State triggering drive circuit unit and correspond to a horizontal scanning line, every grade of triggering drive circuit unit will triggering driving signal to input its right The OLED driver circuit in multiple pixel regions defined by the scan line answered.

Preferably, n-th (1≤n≤N, and n is integer) described triggering drive circuit unit of grade include pull up control module, Pull-up module, signal control module and pull-down module;Pull-up control module, pull-up module and pull-down module are connected to pull-up Control node, signal control module and pull-down module are connected to output node, and pull-down module inputs the first clock signal, signal control Molding block inputs n-th grade of pulse width modulating signal and second clock signal, and the output node exports n-th grade of triggering driving letter Number.

Preferably, the first clock signal and second clock signal have the identical period 1, within the period 1, including the One clock signal is in high level, second clock signal is in low level first time period, further includes at the first clock signal The second time period of high level is in low level, second clock signal.

Preferably, n-th grade of the triggering that n-th (1≤n≤N-1, and n is integer) grade triggers drive circuit unit output is driven Dynamic signal inputs (n+1)th grade of triggering drive circuit unit as (n+1)th grade of pulse width modulating signal.

Preferably, pull-up control module includes first film transistor, the second thin film transistor (TFT) and first capacitor;First The grid of thin film transistor (TFT) and the equal input high level that drains, the source electrode of first film transistor connect the grid of the second thin film transistor (TFT) Pole;The drain electrode input high level of second thin film transistor (TFT), the source electrode connection pull-up control node of the second thin film transistor (TFT);First electricity Holding includes the first pole plate and the second pole plate, and the first pole plate connects the source electrode of first film transistor and the grid of the second thin film transistor (TFT) Pole, the second pole plate connection pull-up control node;

Pull-up module includes third thin film transistor (TFT), the 4th thin film transistor (TFT) and the second capacitor;Third thin film transistor (TFT) Grid and the equal input high level of draining, the source electrode of three thin film transistor (TFT)s connect the grid of the 4th thin film transistor (TFT);4th film The drain electrode input high level of transistor, the source electrode connection output node of the 4th thin film transistor (TFT) simultaneously export n-th grade of triggering driving letter Number;

Signal control module includes the 5th thin film transistor (TFT) and the 7th thin film transistor (TFT);The grid of 5th thin film transistor (TFT) connects The source electrode of the 7th thin film transistor (TFT) is connect, the drain electrode connection of the 5th thin film transistor (TFT) pulls up control node, the 5th thin film transistor (TFT) Source electrode input power negative pressure;The grid of 7th thin film transistor (TFT) inputs second clock signal, and the drain electrode of the 7th thin film transistor (TFT) is defeated Enter n-th grade of pulse width modulating signal;

Pull-down module includes the 6th thin film transistor (TFT) and the 8th thin film transistor (TFT);The grid connection the of 6th thin film transistor (TFT) The source electrode of eight thin film transistor (TFT)s, the 6th thin film transistor (TFT) and drain electrode connection output node, source electrode input power negative pressure;8th film The grid of transistor connects the first clock signal, the drain electrode connection pull-up control node of the 8th thin film transistor (TFT).

Preferably, n-th grade of triggering drive circuit unit further includes the second supporting film transistor;

The grid of second supporting film transistor inputs clear signal, and the drain electrode of the second supporting film transistor connects output Node, the source electrode input power negative pressure of the second supporting film transistor.

Preferably, n-th grade of triggering drive circuit unit further includes the first supporting film transistor;

The grid of first supporting film transistor inputs clear signal, described in the drain electrode connection of the first supporting film transistor The source electrode input power of the source electrode of 7th thin film transistor (TFT) and the grid of the 5th thin film transistor (TFT), the first supporting film transistor is negative Pressure.

Preferably, n-th grade of triggering drive circuit unit further includes third supporting film transistor;

The grid of third supporting film transistor inputs clear signal, the drain electrode connection the 8th of third supporting film transistor The grid of the source electrode of thin film transistor (TFT) and the 6th thin film transistor (TFT), the source electrode input high level of third supporting film transistor.

Compared with prior art, the present invention can bring it is at least one of following the utility model has the advantages that

1, it can reach under the driving of Organic Light Emitting Diode same current, show the function of different grey menus;

2, it avoids when showing low grey menu, since driving current is lower, the picture caused by electric current is unstable is uneven Problem;

3, organic light-emitting display device is modulated by adjusting the first clock signal, second clock signal and pulse width and is believed Number, it can the flexible modulation duty ratios and timing at different levels for triggering driving signals;

4, organic light-emitting display device can reach (n+1)th grade of triggering driving signal timing and lag behind n-th grade of triggering driving letter The timing of the effect of number timing, the scanning voltage corresponding to the input of the (n+1)th horizontal scanning line lags behind sweeping for line n scan line input The timing of voltage is retouched, can be more effective and meticulously controls the OLED driver circuit that do not go together in pixel region.

Detailed description of the invention

Below by clearly understandable mode, preferred embodiment is described with reference to the drawings, the present invention is given furtherly It is bright.

Fig. 1 is a kind of circuit diagram of the OLED driver circuit of prior art;

Fig. 2 is the circuit diagram of OLED driver circuit of the invention;

Fig. 3 is the main signal timing diagram of OLED driver circuit shown in Fig. 2;

Fig. 4 is a kind of structural schematic diagram for triggering driving circuit in organic light-emitting display device of the present invention;

Fig. 5 is the circuit diagrams at different levels for triggering drive circuit unit in triggering driving circuit shown in Fig. 4;

Fig. 6 is the timing diagram of main signal in one embodiment of triggering driving circuit shown in Fig. 4;

Fig. 7 is the first clock signal and second clock signal in another embodiment of triggering driving circuit shown in Fig. 4 Timing diagram;

Fig. 8 is the schematic diagram of the triggering attached first supporting film transistor of drive circuit unit shown in Fig. 5;

Fig. 9 is the schematic diagram of the triggering attached second supporting film transistor of drive circuit unit shown in Fig. 5;

Figure 10 is the schematic diagram of the triggering attached third supporting film transistor of drive circuit unit shown in Fig. 5;

Figure 11 is a kind of structural schematic diagram of one embodiment of organic light-emitting display device of the invention;

Figure 12 is a kind of structural schematic diagram of another embodiment of organic light-emitting display device of the invention;

Figure 13 is a kind of structural schematic diagram of another embodiment of organic light-emitting display device of the invention;

Figure 14 is a kind of structural schematic diagram of another embodiment of organic light-emitting display device of the invention;

Figure 15 is a kind of structural schematic diagram of another embodiment of organic light-emitting display device of the invention;

Figure 16 is a kind of structural schematic diagram of another embodiment of organic light-emitting display device of the invention;

Figure 17 is a kind of structural schematic diagram of another embodiment of organic light-emitting display device of the invention.

Specific embodiment

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, Detailed description of the invention will be compareed below A specific embodiment of the invention.It should be evident that drawings in the following description are only some embodiments of the invention, for For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other Attached drawing, and obtain other embodiments.

To make simplified form, part related to the present invention is only schematically shown in each figure, they are not represented Its practical structures as product.In addition, there is identical structure or function in some figures so that simplified form is easy to understand Component only symbolically depicts one of those, or has only marked one of those.Herein, "one" is not only indicated " only this ", can also indicate the situation of " more than one ".

Organic light-emitting display device of the invention includes: criss-cross scan line and data line, by scan line and data Line intersects the pixel region limited and triggering driving circuit, and scanning voltage is inputted pixel region data line for data by scan line Voltage input pixel region, which triggers driving circuit, will trigger driving signal Emission input pixel region, and each pixel region is equal Equipped with OLED driver circuit.

The circuit diagram of OLED driver circuit is as shown in Fig. 2, the OLED driver circuit The 11st thin film transistor (TFT) T11, the 12nd thin film transistor (TFT) T12, the 13rd including being located at scan line and data line infall Thin film transistor (TFT) T13 and Organic Light Emitting Diode OLED.

Wherein, the 11st thin film transistor (TFT) T11 is opened or closed according to scanning voltage, when opening by data voltage the tenth Two thin film transistor (TFT) T12, the 12nd thin film transistor (TFT) T12's of control opens or closes;12nd thin film transistor (TFT) T12 is being opened When generate driving current be transferred to the 13rd thin film transistor (TFT) T13;13rd thin film transistor (TFT) T13 is defeated according to triggering driving circuit The triggering driving signal Emission entered is opened or closed, and controlling driving current caused by the 12nd thin film transistor (TFT) T12 is It is no to be transferred to Organic Light Emitting Diode OLED;Organic Light Emitting Diode OLED receives the 13rd thin film transistor (TFT) T13 transmission Light is generated after driving current.

Therefore in the identical situation of driving current size, the time ratio of the 13rd thin film transistor (TFT) T13 opening and closing Example is different, and due to the visual persistence effect of human eye, pixel region can show the picture of different grayscale.It avoids in display low ash Picture unevenness problem when rank, due to caused by driving current is lower and electric current is unstable.

The specific structure of OLED driver circuit is as follows:

The grid of 11st thin film transistor (TFT) T11 connects scan line, and the drain electrode of the 11st thin film transistor (TFT) T11 connects data Line, the source electrode of the 11st thin film transistor (TFT) T11 connect the grid of the 12nd thin film transistor (TFT) T12;

The grid of 12nd thin film transistor (TFT) T12 connects the source electrode of the 11st thin film transistor (TFT) T11, the 12nd film crystal The source electrode of drain electrode the input supply voltage VDD, the 12nd thin film transistor (TFT) T12 of pipe T12 connect the 13rd thin film transistor (TFT) T13's Drain electrode;

Grid input triggering the driving signal Emission, the 13rd thin film transistor (TFT) T13 of 13rd thin film transistor (TFT) T13 The 12nd thin film transistor (TFT) T12 of drain electrode connection source electrode, the source electrode of the 13rd thin film transistor (TFT) T13 connects organic light-emitting diodes The anode of pipe;

Organic Light Emitting Diode includes anode and cathode, and anode connects the source electrode of the 13rd thin film transistor (TFT) T13, and cathode is defeated Enter power supply negative pressure VSS.

The source electrode of 11 thin film transistor (TFT) T11 and the grid of the 12nd thin film transistor (TFT) T12 are electrically connected to pixel electrode, pass The drive voltage line and pixel electrode of power transmission source voltage VDD has overlapping region, and is separated by interlayer dielectric, drive voltage line Storage capacitance Cst is constituted as dielectric material using interlayer dielectric with pixel electrode.One end connection the of storage capacitance Cst The other end of the source electrode of 11 thin film transistor (TFT) T11 and the grid of the 12nd thin film transistor (TFT) T12, storage capacitance Cst connects electricity The drain electrode of source voltage VDD and the 12nd thin film transistor (TFT) T12.

For convenience of description, by the friendship of the source electrode of the 11st thin film transistor (TFT) T11 and the grid of the 12nd thin film transistor (TFT) T12 Contact is denoted as node P.

Fig. 3 is the main signal timing diagram of OLED driver circuit.Under normal display state, supply voltage VDD keeps high potential, and power supply negative pressure VSS keeps low potential.When scanning voltage is passed to the 11st film by the scan line of the row When transistor T11, the 11st thin film transistor (TFT) T11 is opened, and the data voltage to be drained is sent to storage capacitance Cst, and gives 12nd thin film transistor (TFT) T12 assigns opening order.Scanning voltage and data voltage are down to low level later, due to the 11st Thin film transistor (TFT) T11 is closed, and node P keeps high potential.12nd thin film transistor (TFT) T12 open after, generate driving current from its Drain electrode is delivered to the drain electrode of the 13rd thin film transistor (TFT) T13.Driving signal Emission is triggered simultaneously controls the 13rd film crystalline substance Body pipe T13's is on and off, and triggering driving signal Emission is the adjustable pulse signal of duty ratio, therefore thin the 12nd Under the situation that film transistor T12 is opened, the timing for triggering driving signal is the bright dark control sequential of Organic Light Emitting Diode.I.e. When triggering driving signal Emission is located at low level, the 13rd thin film transistor (TFT) T13 is closed, Organic Light Emitting Diode anode There is no electric current input, Organic Light Emitting Diode does not shine;When triggering driving signal Emission is located at high level, the 12nd is thin Film transistor T12 and the 13rd thin film transistor (TFT) T13 is opened, and inputs organic hair via the electric current of the 13rd thin film transistor (TFT) T13 Optical diode anode, organic light-emitting diode.Therefore, the bright dark timing of Organic Light Emitting Diode is that duty ratio and triggering are driven The dynamic consistent pulse sequence of signal Emission.

Organic light-emitting display device of the invention further includes the triggering driving circuit of output triggering driving signal Emission, Its structure is as shown in Figure 4.Triggering driving circuit includes that N (N >=2, and N is integer) grade triggers drive circuit unit (Emission ), n-th Circuit (1≤n≤N, and n is integer) grade triggers the circuit diagram of drive circuit unit as shown in figure 5, every grade of triggering Drive circuit unit corresponds to a horizontal scanning line, and n-th grade of (1≤n≤N, and n is integer) triggering driving circuit triggers n-th grade Driving signal En inputs multiple pixel regions defined by its corresponding scan line.

N-th grade of triggering drive circuit unit include pull-up control module 01, pull-up module 02, signal control module 03 and Pull-down module 04.Pull up control module 01 and the equal input high level VGH of pull-up module 02, signal control module 03 and pull-down module 04 equal input power negative pressure VSS;Pull-up control module 01, signal control module 03 and pull-down module 04 are connected to pull-up control section Point netAn, pull-up module 02 and pull-down module 04 are connected to output node netBn.Output node netBn output triggering driving letter Number Emission, n-th grade of triggering driving signal are denoted as En.

It pulls up control module 01 and receives high level VGH, charge to pull-up control node netAn.

Pull-up module 02 receives high level VGH, charges to output node netBn, and controlled by output node netBn System, output triggering driving signal En.

Signal control module 03 receives n-th grade of pulse width modulating signal PWMn and second clock signal CK2, controls to pull-up Node netAn processed carries out drop-down and empties.

Pull-down module 04 receives the first clock signal CK1, and is controlled by pull-up control node netAn, to output node NetBn carries out drop-down and empties.

Specifically, pull-up control module 01 includes first film transistor T1, the second thin film transistor (TFT) T2 and the first electricity Hold C1.The grid of first film transistor T1 and drain electrode are all connected with high level VGH, the source electrode connection of first film transistor T1 the The grid of two thin film transistor (TFT) T2;The drain electrode of second thin film transistor (TFT) T2 connects high level VGH, the source of the second thin film transistor (TFT) T2 Pole connection pull-up control node netAn;First capacitor C1 includes the first pole plate and the second pole plate, and the first pole plate connects the first film The grid of the source electrode of transistor T1 and the second thin film transistor (TFT) T2, the second pole plate connection pull-up control node netAn.

Pull-up module 02 includes third thin film transistor (TFT) T3, the 4th thin film transistor (TFT) T4 and the second capacitor C2.Third is thin The grid of film transistor T3 and drain electrode are all connected with high level VGH, and the source electrode of third thin film transistor (TFT) T3 connects the 4th film crystal The grid of pipe T4;The drain electrode of 4th thin film transistor (TFT) T4 connects high level VGH, and the source electrode of the 4th thin film transistor (TFT) T4 connects output Node netBn simultaneously exports triggering driving signal En.

Signal control module 03 includes the 5th thin film transistor (TFT) T5 and the 7th thin film transistor (TFT) T7.5th thin film transistor (TFT) T5 Grid connect the 7th thin film transistor (TFT) T7 source electrode, the 5th thin film transistor (TFT) T5 drain electrode connection pull-up control node netAn, The source electrode input power negative pressure VSS of 5th thin film transistor (TFT) T5;The grid of 7th thin film transistor (TFT) T7 connects second clock signal The drain electrode of CK2, the 7th thin film transistor (TFT) T7 connect n-th grade of pulse width modulating signal PWMn.For convenience of description, by the 7th film The tie point of transistor T7 source electrode and the 5th thin film transistor (TFT) T5 grid is denoted as first node netCn.

Pull-down module 04 includes the 6th thin film transistor (TFT) T6 and the 8th thin film transistor (TFT) T8.The grid of 6th thin film transistor (TFT) T6 Pole connects the source electrode of the 8th thin film transistor (TFT) T8, and the drain electrode of the 6th thin film transistor (TFT) T6 connects output node netBn, the 6th film The source electrode input power negative pressure VSS of transistor T6;The grid of 8th thin film transistor (TFT) T8 connects the first clock signal CK1, and the 8th The drain electrode connection pull-up control node netAn of thin film transistor (TFT) T8.For convenience of description, by the 8th thin film transistor (TFT) T8 source electrode and The tie point of six thin film transistor (TFT) T6 grids is denoted as second node netDn.

For five input signals: under normal display state, high level VGH keeps high potential, and power supply negative pressure VSS is kept Low potential.N-th grade of pulse width modulating signal PWMn is the adjustable pulse signal of duty ratio, the first clock signal CK1 and second Clock signal CK2 has the identical period to be denoted as period 1 τ 1, within 1 time of period 1 τ, including the first clock signal CK1 It is in low level first time period in high level, second clock signal CK2, further includes that the first clock signal CK1 is in low Level, second clock signal CK2 are in the second time period of high level, such as: the first clock signal CK1 and second clock signal The cyclic pulse signal that CK2 can be 50% for duty ratio as shown in FIG. 6, or duty ratio as shown in Figure 7 is not For 50% cyclic pulse signal.The period of pulse width modulating signal PWMn is second round τ 2.

Display device is shown that each frame of image is divided into multiple subframes, the period of each signal is son in display device The integral multiple of frame time.

The working principle for triggering driving circuit is as follows:

Under normal display state, high level VGH is located at high potential, first film transistor T1 and third thin film transistor (TFT) The constant opening of T3 drives high level VGH to be sent to first capacitor C1 and the second capacitor C2, at this time the second thin film transistor (TFT) T2 and The grid of four thin film transistor (TFT) T4 also receives the high potential and opening of VGH, therefore the high potential of VGH is via the second film crystal Pipe T2 is transferred to pull-up control node netAn;High level VGH is transferred to the of the second capacitor C2 via the 4th thin film transistor (TFT) T4 The drain electrode of quadripolar plate and the 6th thin film transistor (TFT) T6.

When pulse width modulating signal PWMn is located at high potential:

When second clock signal CK2 is high potential, the 7th thin film transistor (TFT) T7 is opened, while high level is transferred to the The grid of five thin film transistor (TFT) T5 opens T5, and the charge of pull-up control node netAn is discharged via the 5th thin film transistor (TFT) T5 To low potential VSS.

Next subframe, second clock signal CK2 become low potential, and correspondingly the first clock signal CK1 becomes high potential, the Eight thin film transistor (TFT) T8 are opened, and the low potential for being drained and (pulling up control node netAn) is sent to its source electrode, drive the 6th Thin film transistor (TFT) T6 is closed;4th thin film transistor (TFT) T4 is opened, and high level VGH is sent to its source electrode, therefore output node The triggering driving signal En of netBn output high potential.

When pulse width modulating signal PWMn is located at low potential:

When second clock signal CK2 is high potential, the 5th thin film transistor (TFT) T5 is closed, via the second thin film transistor (TFT) T2 The charge for being transferred to pull-up control node netAn can not be released effectively, therefore pulled up control node netAn and still kept high potential.

Next subframe, second clock signal CK2 become low potential, and correspondingly the first clock signal CK1 becomes high potential, the Eight thin film transistor (TFT) T8 are opened, and the high potential for being drained and (pulling up control node netAn) is sent to its source electrode, drive the 6th Thin film transistor (TFT) T6 is opened;6th thin film transistor (TFT) T6 is opened, and the power supply negative pressure VSS of low potential is sent to its drain electrode, therefore The triggering driving signal En of output node netBn output low potential.

Frame stabilization when in view of display device booting discharges problem with charge when shutdown, can touch at n-th grade It sends out and increases one or more supporting film transistors in drive circuit unit, comprising: drain electrode as shown in Figure 8 is connected to first segment Point netCn, source electrode are connected to the first supporting film transistor T21 of power supply negative pressure VSS;Drain electrode as shown in Figure 9 is connected to defeated Egress netBn, source electrode are connected to the second supporting film transistor T22 of power supply negative pressure VSS;Drain electrode connection as shown in Figure 10 To second node netDn, source electrode is connected to the third supporting film transistor T23 of high level VGH.These three thin film transistor (TFT)s Grid is all connected with clear signal CLR.When display device is switched on or shuts down, clear signal CLR can be in a subframe or more subframes High potential is in time.Three listed supporting film transistors can be added individually to triggering drive circuit unit, can also Two of them or three are added simultaneously.

When display device booting, the grid of the clear signal CLR input third supporting film transistor T23 of high potential, Third supporting film transistor T23 is opened, and the high level VGH in high potential is transmitted via third supporting film transistor T23 To second node netDn, the 6th thin film transistor (TFT) T6 is driven to open, the power supply negative pressure VSS in low potential is via the 6th film The source electrode of transistor T6 is sent to its drain electrode, so n-th grade of triggering driving signal En output is low potential, display device is aobvious at this time Show black picture.Newly-increased third supporting film transistor T23 can prevent display device booting but data voltage is not yet sent to When pixel region, the picture of display occurs abnormal.

When display device shutdown, high level VGH becomes low potential, if there is residual charge at first node netCn, the One supporting film transistor T21 is opened, and residual charge is discharged;If output node netBn has residual charge, the second auxiliary is thin Film transistor T22 is opened, and residual charge is discharged;If there is residual charge at second node netDn, third supporting film crystal Pipe T23 is opened, and residual charge is discharged.Residual charge is discharged after shutdown can effectively increase each film crystal in triggering driving circuit The bulk life time of pipe.

In organic light-emitting display device of the invention, n-th grade of triggering driving signal En controls its corresponding scan line institute The 13rd thin film transistor (TFT) opens or closes in the pixel region of restriction, since (n+1)th (1≤n≤N-1, and n is integer) row is swept Retouch the scanning voltage of line input timing lag behind the input of line n scan line scanning voltage timing, it is preferable that when the It, can when the timing that the timing of n+1 grades of triggering driving signal En+1 triggers driving signal En than n-th grade lags one or more subframes OLED driver circuit that is more effective and meticulously controlling pixel region of not going together.

Therefore in the present embodiment, n-th (1≤n≤N-1, and n is integer) grade triggers the n-th of drive circuit unit output Grade triggering driving signal En inputs (n+1)th grade of triggering drive circuit unit as (n+1)th grade of pulse width modulating signal PWMn+1. The first order pulse width modulating signal PWM1 that 1st grade of pulse width modulating signal is then an externally input.

Such as: Fig. 6 is the timing diagram for triggering main signal in driving circuit.Externally input 1st grade of pulse width in figure The second round τ 2 of modulated signal PWM1 is 11 subframes, the first clock signal CK1 and second clock signal CK2 common cycle the One period tau 1 is 2 subframes.The timing diagram of E1, E2, E3 are illustrated only in Fig. 6, triggering driving signal Emission later can And so on.

In fact, pixel makes one the other grayscale of outlook by the bright dark time scale of Organic Light Emitting Diode, that is, input n-th grade The duty ratio of n-th grade of triggering driving signal En of Organic Light Emitting Diode circuit determines.Therefore in other embodiments, arteries and veins is adjusted Rush bandwidth modulation signals PWMn, the period of the first clock signal CK1 and second clock signal CK2 and sequential relationship can have it is cleverer Selection living.Correspondingly, the connection relationship triggered between the structure of drive circuit unit and each triggering drive circuit unit can also To make modification and simplification.

Such as: the timing of pulse width modulating signal PWMn can be divided into multiple stages, and the duty ratio in each stage is different, because This input do not go together OLED driver circuit triggering driving signal duty ratio difference, have due to existing Machine luminous display unit is generally existing since panel top and the bottom driving circuit is of different sizes, leads to panel top and the bottom luminance difference Different problem, therefore the triggering driving circuit of this embodiment can effectively make up this difference;Or n-th grade of triggering driving circuit list Member receives externally input n-th grade of pulse width modulating signal PWMn, n-th grade of pulse width modulating signal PWMn duty ratio respectively It is corresponding with the average grayscale that the row pixel need to be shown, it can reduce the power consumption of display device;Or by identical pulse width tune Signal PWMn processed inputs triggering drive circuit units at different levels, while it is received to control each OLED driver circuit institute Driving signal En is triggered, can simplify the structure of triggering driving circuit.

Since OLED driver circuit of the invention overcomes, electric current under low ash rank is smaller and unstable to be asked Topic, therefore on this basis, low ash rank can be carried out further by regulating and controlling the duty ratio of pulse width modulating signal PWMn Subdivision.Human eye is higher to the susceptibility of low ash rank, therefore the present invention can effectively optimize picture quality.

The invention also discloses the circuit distributed architectures of organic light-emitting display device.The display device not only includes above-mentioned touching Hair driving circuit 13, criss-cross scan line and data line and the multiple pixel regions limited by scan line and data line intersection Domain, each pixel region are equipped with OLED driver circuit;It further include that the turntable driving of signal is provided for scan line Circuit 11, the data drive circuit that signal is provided for data line and other driving circuit (such as sequential control circuits, gamma voltage Generator etc.), data drive circuit and other driving circuits are collectively referred to as data and other driving circuits 12.Display device periphery Top circuit area, bottom circuit region, left side circuit region and right side circuit region may be equipped with, wherein data and other driving electricity Road 12 is usually located at bottom circuit region, and usually individual chip form;Top circuit area, left side circuit region and right side Circuit region can be used as individual chip, and the display surface that the devices such as thin film transistor (TFT) are integrated in display device also can be used On plate.

Therefore scan drive circuit 11 and triggering driving circuit 13 can be there are many arrangement modes in display device, packet It includes:

Arrangement mode 1: as shown in figure 11, scan drive circuit 11 is located at left side circuit region, triggering driving circuit 13 is located at Right side circuit region.

This arrangement mode is by scan drive circuit 11 and triggering 13 circuit of the driving circuit circuit that be respectively placed in two different Region facilitates design and production.

Arrangement mode 2: as shown in figure 12, partial scan driving circuit 11 and part triggering driving circuit 13 are located at left side electricity Road area, partial scan driving circuit 11 and part triggering driving circuit 13 are located at right side circuit region.

This arrangement mode is equipped with scan drive circuit 11 and triggering driving circuit 13 in panel two sides, so that scanning voltage Each pixel region that display panel can be reached within the shorter time with triggering driving voltage, reduces signal delay.

Arrangement mode 3: as shown in figure 13, scan drive circuit 11 and triggering driving circuit 13 are respectively positioned on left side circuit region.

Arrangement mode 4: as shown in figure 14, scan drive circuit 11 and triggering driving circuit 13 are respectively positioned on right side circuit region.

This two kinds of arrangement modes reduce the circuit region of left or right side, are conducive to the display device for making narrow frame.

Arrangement mode 5: as shown in figure 15, scan drive circuit 11 is located at left side circuit region and right side circuit region, and triggering is driven Dynamic circuit 13 is located at top circuit area.

Scan drive circuit 11 in this arrangement mode positioned at two sides provides stronger driving capability, reduces signal and prolongs Late;The circuit that left or right side circuit region need to be arranged is reduced, and is conducive to the display device for making narrow frame;And it is individually placed in The triggering driving circuit 13 of one circuit region is smaller to the change of existing design, facilitates design and production.

Arrangement mode 6: as shown in figure 16, partial scan driving circuit 11 and part triggering driving circuit 13 are located at left side electricity Road area, partial scan driving circuit 11 and part triggering driving circuit 13 are located at right side circuit region, partial scan driving circuit 11 Positioned at top circuit area.

This arrangement mode compares arrangement mode 2 and increases partial scan driving circuit 11 positioned at top circuit area, therefore In addition to except arrangement mode 2 the advantages of, the driving capability of scan drive circuit is enhanced.

Arrangement mode 7: as shown in figure 17, scan drive circuit 11 is located at left side circuit region and right side circuit region, and triggering is driven Dynamic circuit 13 is located at bottom circuit region, and triggering driving circuit 13 can be integrated with data drive circuit module and other driving circuits It is integrated in the aobvious of display device on a single die or separately as a chip or using devices such as thin film transistor (TFT), capacitors Show panel bottom.

This arrangement mode compares arrangement mode 5 and changes the triggering driving circuit 13 for being located at top circuit area to bottom circuit Area, since the bottom of the display devices such as mobile phone, TV is usually constructed with key area etc. as blocking, this arrangement mode is except row Outside the advantages of column mode 5, top circuit region is reduced, display area is increased.

OLED driver circuit disclosed by the invention is controlled organic using externally input triggering driving signal The bright dark time scale of light emitting diode OLED reaches under same current driving, shows the function of different grey menus, can be with It avoids when showing low grey menu, the picture unevenness problem since driving current is lower, caused by electric current is unstable.The present invention Also disclose the display device using the OLED driver circuit.

It should be noted that above-described embodiment can be freely combined as needed.The above is only of the invention preferred Embodiment, it is noted that for those skilled in the art, in the premise for not departing from the principle of the invention Under, multiple improvements and modifications can also be made, these modifications and embellishments should also be considered as the scope of protection of the present invention.

Claims (6)

1. a kind of organic light-emitting display device, comprising: criss-cross scan line and data line and by scan line and data line Intersect the multiple pixel regions limited, scanning voltage is inputted its corresponding pixel region by every horizontal scanning line, and each row of data line will Data voltage inputs its corresponding pixel region, it is characterised in that:
Each pixel region is equipped with OLED driver circuit, and the OLED driver circuit includes:
11st thin film transistor (TFT), the 12nd thin film transistor (TFT), the 13rd thin film transistor (TFT) and Organic Light Emitting Diode;
11st thin film transistor (TFT), opens or closes according to scanning voltage, and it is thin that data voltage is transferred to the 12nd when opening Film transistor, the 12nd thin film transistor (TFT) of control open or close;
12nd thin film transistor (TFT) generates driving current when opening and is transferred to the 13rd thin film transistor (TFT);
13rd thin film transistor (TFT) is opened or closed according to externally input triggering driving signal, controls the 12nd film crystal Whether driving current caused by managing is transferred to Organic Light Emitting Diode;
Organic Light Emitting Diode generates light after receiving the driving current of the 13rd thin film transistor (TFT) transmission;
The grid of 11st thin film transistor (TFT) connects scan line, and the drain electrode of the 11st thin film transistor (TFT) connects data line, the The source electrode of 11 thin film transistor (TFT)s connects the grid of the 12nd thin film transistor (TFT);
The source electrode connection the 13rd of the drain electrode input supply voltage of 12nd thin film transistor (TFT), the 12nd thin film transistor (TFT) is thin The drain electrode of film transistor;
The grid of 13rd thin film transistor (TFT) inputs the triggering driving signal, the source electrode connection of the 13rd thin film transistor (TFT) Organic Light Emitting Diode;
The Organic Light Emitting Diode includes anode and cathode, and anode connects the source electrode of the 13rd thin film transistor (TFT), cathode input Power supply negative pressure;
The organic light-emitting display device further includes being triggered the triggering that drive circuit unit is constituted by N (N >=2, and N is integer) grade and being driven Dynamic circuit;Every grade of triggering drive circuit unit corresponds to a horizontal scanning line, and every grade of triggering drive circuit unit drives triggering Dynamic signal inputs the OLED driver circuit in multiple pixel regions defined by its corresponding scan line;
Wherein, n-th (1≤n≤N, and n is integer) described triggering drive circuit unit of grade includes pull-up control module, upper drawing-die Block, signal control module and pull-down module;The pull-up control module, pull-up module and pull-down module are connected to pull-up control Node processed, the pull-up module and pull-down module are connected to output node, and the pull-down module inputs the first clock signal, described Signal control module inputs n-th grade of pulse width modulating signal and second clock signal, and the output node exports n-th grade of triggering Driving signal;
The pull-up control module includes first film transistor, the second thin film transistor (TFT) and first capacitor;The first film is brilliant The grid of body pipe and the equal input high level that drains, the source electrode of first film transistor connect the grid of the second thin film transistor (TFT);The The drain electrode input high level of two thin film transistor (TFT)s, the source electrode connection pull-up control node of the second thin film transistor (TFT);First capacitor packet The first pole plate and the second pole plate are included, the first pole plate connects the source electrode of first film transistor and the grid of the second thin film transistor (TFT), Second pole plate connection pull-up control node;
The pull-up module includes third thin film transistor (TFT), the 4th thin film transistor (TFT) and the second capacitor;Third thin film transistor (TFT) Grid and the equal input high level of draining, the source electrode of third thin film transistor (TFT) connect the grid of the 4th thin film transistor (TFT);4th is thin The drain electrode input high level of film transistor, the source electrode connection output node of the 4th thin film transistor (TFT) simultaneously export n-th grade of triggering driving Signal;
The signal control module includes the 5th thin film transistor (TFT) and the 7th thin film transistor (TFT);The grid of 5th thin film transistor (TFT) connects The source electrode of the 7th thin film transistor (TFT) is connect, the drain electrode connection of the 5th thin film transistor (TFT) pulls up control node, the 5th thin film transistor (TFT) Source electrode input power negative pressure;The grid of 7th thin film transistor (TFT) inputs second clock signal, and the drain electrode of the 7th thin film transistor (TFT) is defeated Enter n-th grade of pulse width modulating signal;
The pull-down module includes the 6th thin film transistor (TFT) and the 8th thin film transistor (TFT);The grid connection the of 6th thin film transistor (TFT) The drain electrode of the source electrode of eight thin film transistor (TFT)s, the 6th thin film transistor (TFT) connects output node, source electrode input power negative pressure;8th film The grid of transistor connects the first clock signal, the drain electrode connection pull-up control node of the 8th thin film transistor (TFT).
2. organic light-emitting display device according to claim 1, it is characterised in that:
First clock signal and second clock signal have the identical period 1, within the period 1, including the first clock Signal is in high level, second clock signal is in low level first time period, further includes that the first clock signal is in low electricity Flat, second clock signal is in the second time period of high level.
3. organic light-emitting display device according to claim 1, it is characterised in that:
Described n-th (1≤n≤N, and n is integer) grade triggers n-th grade of triggering driving signal conduct of drive circuit unit output (n+1)th grade of pulse width modulating signal inputs (n+1)th grade of triggering drive circuit unit.
4. organic light-emitting display device according to claim 3, it is characterised in that:
N-th grade of triggering drive circuit unit further includes the second supporting film transistor;
The grid of second supporting film transistor inputs clear signal, the drain electrode connection output section of the second supporting film transistor Point, the source electrode input power negative pressure of the second supporting film transistor.
5. organic light-emitting display device according to claim 1, it is characterised in that:
N-th grade of triggering drive circuit unit further includes the first supporting film transistor;
The grid of first supporting film transistor inputs clear signal, the drain electrode connection the described 7th of the first supporting film transistor The grid of the source electrode of thin film transistor (TFT) and the 5th thin film transistor (TFT), the source electrode input power negative pressure of the first supporting film transistor.
6. organic light-emitting display device according to claim 1, it is characterised in that:
N-th grade of triggering drive circuit unit further includes third supporting film transistor;
The grid of third supporting film transistor inputs clear signal, and the drain electrode of third supporting film transistor connects the 8th film The grid of the source electrode of transistor and the 6th thin film transistor (TFT), the source electrode input high level of third supporting film transistor.
CN201711231959.6A 2017-11-30 2017-11-30 A kind of OLED driver circuit and its display device CN108010489B (en)

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