CN102368379B - The pixel-driving circuit of active matrix organic light-emitting device - Google Patents
The pixel-driving circuit of active matrix organic light-emitting device Download PDFInfo
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Abstract
The present invention relates to Display Technique field, particularly relate to the pixel-driving circuit of a kind of active matrix organic light-emitting device.This pixel-driving circuit includes the first signal input part, secondary signal input, some DC supply inputs, setting module, driving module and memory module, this first signal input part is connected with setting module and driving module respectively, for receiving an external control signal, and by this external control signal transmission to setting module and driving module；Secondary signal input is connected with setting module, for receiving an external data signal, and transmits this external data signal to setting module；Setting module is connected with memory module and driving module respectively, is used for responding described external control signal, and controls voltage according to described external control signal by described driving module settings one, and described memory module is used for storing described control voltage；Described driving module is for according to controlling Control of Voltage organic luminescent device.
Description
Technical field
The present invention relates to Display Technique field, particularly relate to the pixel-driving circuit of active matrix organic light-emitting device.
Background technology
OLED (OLED) is active illuminating device, compare present main flow flat panel display Thin Film Transistor-LCD, OLED has the advantages such as high-contrast, wide viewing angle, adaptive temperature scope is wide, fast response time, volume are thinner, is one of technology of greatest concern in current flat panel display.
OLED can use passive-matrix (PM) to drive, it is possible to use actively (AM) matrix driving.Relatively passive-matrix drives, and active matrix drive has that the information capacity of display is big, power consumption is relatively low, length device lifetime, the image quality advantage such as more preferably, and passive-matrix drives and is applicable to simple, the display device of low resolution.
Active matrix drive circuit generally includes multiple thin film transistor (TFT), and the plurality of thin film transistor (TFT) can be low-temperature polysilicon film transistor, it is also possible to be amorphous silicon film transistor, it is also possible to be oxide thin film transistor or organic thin film transistor etc..In practice, the multiple thin film transistor (TFT)s in active matrix drive circuit affected by the many factors in processing technology and worked in load difference, can exist between the plurality of thin film transistor (TFT) or produce difference, cause OLED occur display uneven phenomenon.Further, since thin film transistor (TFT) long-term work is under voltage biasing conditions, cause thin film transistor (TFT) that characteristic drift occurs, cause display brightness to reduce, even the defect such as component failure.
To this end, industry proposes a kind of pixel-driving circuit as shown in Figure 1, for solving the difference between multiple thin film transistor (TFT), the characteristic drift of compensation film transistor simultaneously.This pixel-driving circuit uses pure P-type TFT.Within the period of scan line selected (addressed), it is undersuing that scan line loads undersuing, i.e. Vscan, and the gate electrode of thin film transistor (TFT) T1, T2 is positioned at electronegative potential, so that thin film transistor (TFT) T1, T2 open conducting.Thin film transistor (TFT) T3, T4 constitute a current mirror (CurrentMirror) structure, and T1 conducting makes the drain electrode of T3 with grid all in relatively electronegative potential, so that T3 opens conducting.Electric current is arrived data wire by node VDD through T3, T1, and the electric current Idata that size of current is provided by peripheral drive circuit determines.The voltage biasing conditions of thin film transistor (TFT) T3 determines and flows through the size that the electric current of T3 just meets Idata, the node voltage of thin film transistor (TFT) T3 conducts the gate electrode to thin film transistor (TFT) T4 due to the conducting of opening of T2, and relies on the electric charge storage function of electric capacity C1 to be stored and keep in scan line the most selected period.According to the principle of current mirror, if the device property of thin film transistor (TFT) T3, T4 is identical, the voltage bias of thin film transistor (TFT) T4 is also at providing the state driving electric current Idata.After scan line terminates addressing, voltage Vscan in scan line recovers to high potential, thin film transistor (TFT) T1, T2 close, and the voltage biasing conditions of thin film transistor (TFT) T4 is kept by electric capacity C1, make power vd D continue to diode OLED and provide the electric current that size is identical with Idata.Thus, needed for the OLED luminescence that drive circuit sets, electric current Idata is written into pixel-driving circuit.
But, above-mentioned pixel-driving circuit has a following problem:
(1) pixel-driving circuit carrys out reset current information by current mirror (thin film transistor (TFT) T3 and T4 composition) is arranged bias voltage, needs thin film transistor (TFT) T3, T4 in current-mirror structure to have the device property of symmetry.When device property between thin film transistor (TFT) T3, T4 is asymmetric, the current information Idata of write cannot be reappeared at the branch road (power vd D, thin film transistor (TFT) T4, diode OLED) driving diode OLED.When the device symmetry of thin film transistor (TFT) T3, T4 is variant between different pixels, in the case of the current information Idata that input is identical, different pixels obtains different diode OLED and drives electric current, makes to occur between each pixel luminance difference, reduces image quality.
(2) after bias voltage write terminates, thin film transistor (TFT) T2 closes, and the gate electrode of thin film transistor (TFT) T3 and other circuit node are in high-impedance state, be in actual suspended state, and the grid source electrode of thin film transistor (TFT) T4 maintains the magnitude of voltage of write substantially.Therefore, during pixel operation, thin film transistor (TFT) T3, T4 are in different voltage biasing conditions, and the drift characteristic causing both is produced difference by this species diversity.Thin film transistor (TFT) T4 bears bigger voltage bias stress, thus characteristic drift by a relatively large margin can occur, the difference of this characteristic drift will cause " mirror image " effect of current-mirror structure worse and worse, and the actual electric current deviation Idata driving diode OLED can be increasingly severe.
Summary of the invention
In view of this, it is necessary to provide the pixel-driving circuit of a kind of active matrix organic light-emitting device, and this pixel-driving circuit can eliminate because of pixel between difference cause under same write signal, drive the inconsistent defect of electric current, eliminate the defect that the characteristic drift caused owing to element is asymmetric in current-mirror structure is inconsistent, and solve the defect that the brightness that causes of TFT characteristic drift declines, and make write signal accurate recreation in pixel-driving circuit.Meanwhile, this circuit should simplify the input request signal to peripheral drive circuit as far as possible, in order to avoid increasing power consumption and cost, also avoiding the decline of the pixel efficient lighting area that too much signal routing brings, i.e. avoiding the reduction of aperture opening ratio.
The pixel-driving circuit of a kind of active matrix organic light-emitting device includes the first signal input part, secondary signal input, setting module, driving module and memory module, this first defeated signal enters end and is connected with setting module and driving module respectively, for receiving an external control signal, and by this external control signal transmission to setting module and driving module；Secondary signal input is connected with setting module, for receiving an external data signal, and transmits this external data signal to setting module；Setting module is connected with memory module and driving module respectively, is used for responding described external control signal, and controls voltage according to described external control signal by described driving module settings one, and described memory module is used for storing described control voltage；Described driving module is for according to controlling Control of Voltage organic luminescent device；Described setting module at least includes that the first switch module, second switch assembly, the 3rd switch module, any one in described first, second, third switch module all include an input, an outfan, a control end；The control end of described first switch module is connected with described first signal input part, and its input is connected with described secondary signal input；The control end of described second switch assembly connects described first signal input part, and its input is connected with outfan or the secondary signal input of described first switch module；Described first switch module is opened with second switch assembly simultaneously or simultaneously closes off；The input of described 3rd switch module connects outfan or the outfan of second switch assembly of described first switch module, and its outfan is connected to organic luminescent device.Described 3rd switch module, according to its input, outfan and the relative voltage bias state of control end, forms the continuously adjustable impedance between input and outfan, and the size of this impedance comprises and between turning off between fully on state.
In the pixel-driving circuit of the described active matrix organic light-emitting device that the present invention provides, described memory module at least includes that charge storage elements and first connects end, charge storage elements includes the first end and the second end, second end is connected end and connects with described first, the outfan of the first end and the outfan of the first switch module or second switch assembly connects, and the end that controls of the 3rd switch module is connected to the first end of charge storage elements.This first connection end is connected to one of described some direct-flow input ends or the anode of Organic Light Emitting Diode.
In the pixel-driving circuit of the described active matrix organic light-emitting device that the present invention provides, described driving module at least includes the 4th switch module, the 5th switch module, the second connection end, 5th switch module and the 3rd switch module are same switch module, and the 4th switch module include an input, an outfan, one control end, the control end of the 4th switch module is connected to described first signal input part, its input is connected to described second and connects end, and outfan is connected to the input of described 3rd switch module；Or, the input of the 4th switch module is connected to described second by described 3rd switch module outfan and input and connects end, and its outfan is connected to described organic luminescent device；This organic luminescent device includes that Organic Light Emitting Diode and the 3rd connects end, and the outfan of described 3rd switch module is connected to the described 3rd by described Organic Light Emitting Diode and connects end.
In the pixel-driving circuit of the described active matrix organic light-emitting device that the present invention provides, described first, second, third switch module is N-channel type thin film transistor (TFT), 4th switch module is P-channel type thin film transistor (TFT), it is same connection end that first connection end and second connects end, and is connected to one first DC source.
In the pixel-driving circuit of the described active matrix organic light-emitting device that the present invention provides, described first, second switch module is P-channel type thin film transistor (TFT), three, the 4th switch modules are N-channel type thin film transistor (TFT), it is same connection end that first connection end and second connects end, and is connected to one first DC source.
In the pixel-driving circuit of the described active matrix organic light-emitting device that the present invention provides, described driving module also includes phase inverter, described phase inverter is connected between described first signal input part and the control end of the 4th switch module, for changing external control signal, control the 4th switch module when making external control signal effective to close, control the 4th switch module when external control signal is invalid and open conducting；Described phase inverter includes the 6th switch module and the 7th switch module, described 4th switch module and first, second switch module complementary switch assembly each other；Six, the 7th switch modules all include an input, control end, an outfan, and the control end of the 6th switch module is connected to the first signal input part, and its input is connected to the second connection end, and outfan is connected to the control end of the 4th switch module；The control end of the 7th switch module and input are connected to the 3rd connection end, and its outfan is connected to the control end of described 4th switch module, and it is same connection end that described first connection end and second connects end, and is connected to one first DC source；Described first, second, third and fourth, six, seven switch modules are P-channel type thin film transistor (TFT).
In the pixel-driving circuit of the described active matrix organic light-emitting device that the present invention provides, described driving module also includes phase inverter, described phase inverter is connected between described first signal input part and the control end of the 4th switch module, for changing external control signal, control the 4th switch module when making external control signal effective to close, control the 4th switch module when external control signal is invalid and open conducting；Described phase inverter includes the 6th switch module and the 7th switch module, described 4th switch module and first, second switch module complementary switch assembly each other；Six, the 7th switch modules all include an input, control end, an outfan, and the control end of the 6th switch module and input are connected to the second connection end, and its outfan is connected to the control end of the 4th switch module；The control end of the 7th switch module is connected to the first signal input part, its input is connected to the 3rd connection end, outfan is connected to the control end of the 4th switch module, and it is same connection end that described first connection end and second connects end, and is connected to one first DC source；First, second, third and fourth, six, seven switch modules are N-channel type thin film transistor (TFT).
In the pixel-driving circuit of the described active matrix organic light-emitting device that the present invention provides, described driving module also includes phase inverter, described phase inverter is connected between described first signal input part and the control end of the 4th switch module, for changing external control signal, control the 4th switch module when making external control signal effective to close, control the 4th switch module when external control signal is invalid and open conducting；Described phase inverter includes the 6th switch module and the 7th switch module, described 4th switch module and first, second switch module complementary switch assembly each other；Six, the 7th switch modules all include an input, control end, an outfan, and the control end of the six, the 7th switch modules is connected to the first signal input part, and its outfan is connected to the control end of the 4th switch module；The input of described 6th switch module is connected to the second connection end, and the input of the 7th switch module is connected to the 3rd connection end；It is same connection end that described first connection end and second connects end, and is connected to one first DC source；Described first, second, third and fourth, seven switch modules are N-channel type thin film transistor (TFT), and the 6th switch module is P-channel type thin film transistor (TFT).
In the pixel-driving circuit of the described active matrix organic light-emitting device that the present invention provides, described driving module at least includes the 4th switch module, 5th switch module, second connects end and phase inverter, described phase inverter includes the 6th switch module and the 7th switch module, 5th switch module and the 3rd switch module are same switch module, and the 4th, 6th, 7th switch module all includes an input, one outfan, one controls end, first end controlling end and charge storage elements of the 3rd switch module is connected to the outfan of second switch assembly, the input of the 3rd switch module is connected to the second connection end, its outfan is connected to the outfan of the first switch module, and the 3rd the outfan of switch module be connected to described organic luminescent device also by input and the outfan of the 4th switch module；The control end of the six, the 7th switch modules is connected to the first signal input part, and its outfan is connected to the control end of the 4th switch module；The input of the 6th switch module is connected to the second connection end, and the input of the 7th switch module is connected to the 3rd connection end；It is same connection end that described first connection end and second connects end, and is connected to one first DC source；Described first, second, third and fourth, six switch modules are P-channel type thin film transistor (TFT), and the 7th switch module is N-channel type thin film transistor (TFT).
In the pixel-driving circuit of the described active matrix organic light-emitting device that the present invention provides, control jointly being completed by setting module and driving module when arranging of voltage, and stored by this memory module；I.e. by driving the 3rd switch module setup control voltage of organic luminescent device, and control voltage is stored in charge storage elements, therefore, the pixel-driving circuit of the active matrix organic light-emitting device that the present invention provides can effectively make up the difference between the thin film transistor (TFT) of different pixels, the concordance making the display brightness of organic luminescent device is preferable, and guarantees information accurate reproduction in pixel-driving circuit of external data signal；Simultaneously, it is possible to effectively make up the display brightness caused due to the characteristic drift of thin film transistor (TFT) and decline defect.Image element circuit of the present invention only comprises first, second signal input part and connects the first connection end of DC source, the second connection end, the 3rd connection end, does not introduce extra signal input part.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the schematic diagram of the pixel-driving circuit of a kind of prior art.
The high-level schematic functional block diagram of the pixel-driving circuit of the better embodiment that Fig. 2 provides for the present invention.
Fig. 3 is the structural representation of a kind of better embodiment of the pixel-driving circuit shown in Fig. 2.
The first embodiment schematic diagram of the pixel-driving circuit that Fig. 4 a and 4b provides for the present invention.
Second embodiment schematic diagram of the pixel-driving circuit that Fig. 5 provides for the present invention.
3rd embodiment schematic diagram of the pixel-driving circuit that Fig. 6 provides for the present invention.
4th embodiment schematic diagram of the pixel-driving circuit that Fig. 7 a, 7b, 7c provide for the present invention.
5th embodiment schematic diagram of the pixel-driving circuit that Fig. 8 provides for the present invention.
The sixth embodiment schematic diagram of the pixel-driving circuit that Fig. 9 provides for the present invention.
Detailed description of the invention
For the pixel-driving circuit of the active matrix organic light-emitting device that the explanation present invention provides, it is described in detail below in conjunction with Figure of description.
Refer to Fig. 2, the high-level schematic functional block diagram of the pixel-driving circuit of the active matrix organic light-emitting device of its better embodiment provided for the present invention.Pixel-driving circuit 100 is used for driving organic luminescent device 200, and it includes the first signal input part 101, secondary signal input 102, setting module 110, drives module 120 and memory module 130.Wherein, the first signal input part 101 is connected with setting module 110 and driving module 120 respectively, and it is for receiving an external control signal, and by this external control signal transmission to setting module 110 and driving module 120.Secondary signal input 102 is connected with setting module 110, and it is for receiving an external data signal, and by this data signal transmission to setting module 110.Setting module 110 is connected with driving module 120, memory module 130 respectively, it is used for response external control signal, and setting a control voltage according to described external data signal by described driving module 120, described control voltage is stored in described memory module 130.Described driving module 130 is for according to controlling Control of Voltage organic luminescent device 200.
The structure of described pixel-driving circuit refers to Fig. 3, the structural representation of its a kind of better embodiment being the pixel-driving circuit shown in Fig. 2.This driving module 110 at least includes the first switch module 111, second switch assembly the 113, the 3rd switch module 115.This memory module 130 at least includes that charge storage elements 131, first connects end 133.The 4th switch module the 121, the 5th switch module 123 and second connects end 124 to drive module 120 at least to include, and the 3rd switch module 115 and the 5th switch module 123 are same switch module.This organic luminescent device 200 at least includes that Organic Light Emitting Diode 201 and the 3rd connects end 202.Any one in this first, second, third, fourth switch module 111,113,115,121 all includes an input, an outfan, a control end, and charge storage elements 131 includes that the first end and first connects the second end that end 133 connects.The control end of this first switch module 111 connects the first signal input part 101, and its input connects secondary signal input 102, and outfan connects the input of second switch assembly 113.The control end of second switch assembly 113 connects the first signal input part 101.First end of charge storage elements 131 is connected to the outfan of the first switch module 111.Control end and first signal input part 101 of the 4th switch module 121 connect, and its input and second connects end and connects, and outfan is connected to the input of the 3rd switch module 115.The end that controls of the 3rd switch module 115 is connected with the first end of charge storage elements 131, and its outfan is connected to organic luminescent device 200.This second connection end 124 is for connecting one first DC source (not shown), and this first connection end 133 is for the outside high potential point of connection one or electronegative potential point, and the 3rd connects end 202 is used for connecting an outside electronegative potential point.
In the present embodiment, described driving module 120 also includes phase inverter 125, described 4th switch module 121 and first, second switch module 111,113 are same type of switch module, i.e. first, second, the 4th switch module is all N-channel type or is all P-channel type thin film transistor (TFT).Described phase inverter is connected between the first signal input part 101 and the control end of the 4th switch module 121, is used for changing external control signal, i.e. when external control signal is effective, controls the 4th switch module 121 and closes；Otherwise, control the 4th switch module 121 and open conducting.This phase inverter includes the 6th switch module and the 7th switch module.
In other embodiments, the first end of described charge storage elements 131 also can be connected with the outfan of second switch assembly 113.The input of described 3rd switch module 115 and second connects end and connects, and its outfan connects the input of the 4th switch module 121, and the outfan of the 4th switch module 121 is connected with organic luminescent device 200.If the 4th switch module 121 and first, second switch module 111,113 are complementary switch assembly, then can save described phase inverter 125.
The operation principle of described pixel-driving circuit 100 is as follows:
When the external control signal on the first signal input part 101 effectively (i.e. the row at this pixel place is by addressing), first, second switch module 111,113 opens conducting；And owing to being connected to the first signal input part 101 by phase inverter 125, the 4th switch module 121 is closed.First, second switch assembly 111, 113 open conducting, make the external data signal from secondary signal input 102 successively through control end and the charge storage elements 131 of the input of the first switch module 111 and outfan transmission to the 3rd switch module 115, this charge storage elements 131 is made to be charged or discharge, and set a control voltage and be stored in described charge storage elements 131, the 3rd switch module 115 is made to open conducting, this external data signal continues through the input of this second switch assembly 113 and outfan and the input of the 3rd switch module 115 and outfan transmits to organic luminescent device 200, and make Organic Light Emitting Diode 201 luminescence of organic luminescent device 200.In the present embodiment, external data signal is a current signal.
When the external control signal on the first signal input part 101 is invalid, first switch module 111, second switch assembly 113 are closed, 4th switch module 121 opens conducting, and makes the power supply signal of the first DC source output transmit the input to the 3rd switch module 115 by input and the outfan of the 4th switch module 121.The control end of the 3rd switch module 115 is electrically connected with charge storage elements 131, therefore, 3rd switch module 115 is held open conducting state, and make the power supply signal of the first DC source output be transmitted to organic luminescent device 200 by input and the outfan of the 3rd switch module 115, make Organic Light Emitting Diode 201 luminous, and meet setting brightness.nullOwing to the write of described external data signal and the power supply signal of the first DC source output drive described Organic Light Emitting Diode 201 all to be completed by the 3rd switch module 115，And during the power supply signal of the write of this external data signal and the output of the first DC source drives described Organic Light Emitting Diode 201，3rd switch module 115 is connected with charge storage elements 301 owing to it controls end，Control its control voltage opened not change，And the size of current passing through the input of the 3rd switch module 115 and the signal of outfan is determined by controlling its control voltage opened，Therefore，The size of current of the power supply signal of the first DC source output is identical with the size of current of this external data signal，I.e. by the write of external data signal，Described charge storage elements is made to store described control voltage，And this control voltage is when external control signal is invalid，Sustainable Control the 3rd switch module 115 turns on，Make by its input identical with the size of current of this external data signal with the size of current of the power supply signal of the first DC source output of outfan，And then make external data signal can obtain accurate reproduction.
Refer to shown in Fig. 4 a and 4b, the schematic diagram of the first embodiment of its pixel-driving circuit provided for the present invention, in this first embodiment, first, second, third, fourth switch module 111,113,115,121 that switch module T11, T12, T13, T14 are the most similar to Figure 3, electric capacity C11 is equivalent to the charge storage elements 131 shown in Fig. 3, the 6th switch module that switch module T15, T16 are similar to Figure 3 and the 7th switch module, a combination thereof is equivalent to phase inverter 125.The control end of switch module T11 is connected to the first signal input part 101, and its input is connected to secondary signal input 102, and outfan is connected to the control end of first end of electric capacity C11, switch module T13.The outfan of switch module T12 is connected to the input of switch module T14, the outfan of switch module T13, its input is connected to secondary signal input 102 (corresponding diagram 4a) or is connected to the outfan (corresponding diagram 4b) of switch module T11, switch module T13 input is connected to the second connection end 124, and its outfan is connected to the input of switch module T14.The control end of switch module T15 is connected to the first signal input part 101, and its input is connected to the second connection end 124, and outfan is connected to the control end of switch module T14.The control end of switch module T16 and input are connected to the 3rd connection end 202, and its outfan is connected to the control end of switch module T14.The outfan of switch module T14 is connected to the 3rd connection end 202 by Organic Light Emitting Diode 201.In this embodiment, switch module T11, T12, T13, T14, T15, T16 are P-channel type thin film transistor (TFT), and the first connection end 131 is connected end 124 for same connection terminal with second.
When the external control signal on the first signal input part 101, effectively (row at pixel place is by addressing, in the present embodiment, external control signal is electronegative potential) time, this switch module T11, T12, T15 open conducting, the conducting of switch module T15, the control end making the switch module T14 being connected with the outfan of switch module T15 is in high potential, and therefore, switch module T14 is closed.Described external data signal is transmitted to switch module T11 by secondary signal input 102, and the input and outfan via switch module T11 transmits to electric capacity C11, the information of voltage of described external data signal is stored by described electric capacity C11, the size of current that the numerical value of described information of voltage transmits with secondary signal input is corresponding, and make the switch module T13 being connected with electric capacity C11 in the conduction state, make the power supply signal being connected the first DC source output that end 124 connects with second via switch module T13, T12 arrives this secondary signal input 102, and the size of current of this power supply signal is identical with the size of current of described external control signal.Now, owing to switch module T14 closes, the electric current flowing through this Organic Light Emitting Diode 201 is 0, and Organic Light Emitting Diode 201 is the most luminous.
When the external control signal on the first signal input part 101 invalid (the row addressing at pixel place terminates, and in the present embodiment, external control signal is high potential), switch module T11, T12, T15 close, and the electric charge above electric capacity C11 is maintained.The control end of switch module T13 is electrically connected with electric capacity C11, and therefore keeps existing setting conducting state.Switch module T15 closes, the input of switch module T16 is connected to the 3rd of low-voltage with control end and is connected end 202, therefore this switch module T16 opens so that its outfan (namely control end of switch module T14) is in low-voltage, and makes switch module T14 open conducting.The conducting branches that switch module T14, T13 are constituted, the power supply signal of the first DC source output is transmitted to organic luminescent device 200 via input and outfan, the input of switch module T14 and the outfan of switch module T13, and makes Organic Light Emitting Diode 201 luminous.Owing to the voltage difference controlled between end and input of switch module T13 is kept by electric capacity C11, and this voltage difference has been arranged at when external control signal is effective in electric capacity C11, described voltage difference determines the size of current flowing through switch module T13, therefore, external control signal effective and invalid time, this voltage extent is identical, i.e. external voltage effective and invalid time, the size of current flowing through this switch module T13 is identical, that is, the power supply signal of this first DC source output is identical with external data signal size, thus, the Organic Light Emitting Diode 201 making the organic luminescent device 200 of different pixels has identical brightness, the defect of the brightness disproportionation that the difference between can solving because of different pixels is brought.
Refer to Fig. 5, the schematic diagram of the second embodiment of its pixel-driving circuit provided for the present invention, in this second embodiment, switch module T21, T22, T23, T24 are respectively equivalent to first, second, third, fourth switch module 111,113,115,121, electric capacity C21 is equivalent to charge storage elements 131, switch module T25, T26 are equivalent to the 6th switch module and the 7th switch module, and a combination thereof is equivalent to phase inverter 125.The end that controls of switch module T23 is connected to outfan and one end of electric capacity C21 of switch module T22.Its input is electrically connected to the outfan of switch module T21, the outfan of switch module T24, and outfan is electrically connected to organic luminescent device 200.The control end of switch module T22 is connected to the first signal input part 101, and input is electrically connected to the outfan of switch module T21, and outfan is electrically connected to electric capacity C21.The control end of switch module T25 and input are electrically connected to the second connection end 124, and its outfan is electrically connected to control end, the outfan of switch module T26 of switch module T24.The control end of switch module T26 is electrically connected to the first signal input part 101, and its input is electrically connected to the 3rd connection end 202.In this embodiment, switch module T21, T22, T23, T24, T25, T26 is N-channel type thin film transistor (TFT).
When the external control signal on the first signal input part 101, effectively (row at pixel place is by addressing, in the present embodiment, external control signal is high potential) time, switch module T21, T22, T26 open conducting, the conducting of switch module T26, the control end making the switch module T24 being connected with the outfan of switch module T26 is in electronegative potential, and therefore, switch module T24 is closed.Described external data signal is transmitted to switch module T21 by secondary signal input 102, and the input and outfan via switch module T21 transmits to switch module T22, and switch module T23, and the corresponding voltage information produced in circuit of described external data signal is stored to electric capacity C21, described electric capacity C21 via switch module T22 transmission.Described external data signal sets up suitable voltage biasing conditions at input and the control end of switch module T23, switch module T23 is made to open conducting state, make the external data signal come by the transmission of switch module T21 outfan transmit to organic smooth optical device 200 via switch module T23, and make Organic Light Emitting Diode 201 luminescence of this organic luminescent device 200.Because now switch module T24 closes, the electric current flowing through this Organic Light Emitting Diode 201 is identical with the size of this external data signal.
When the external control signal on the first signal input part 101 is invalid, (the row addressing at pixel place terminates, in the present embodiment, external control signal is electronegative potential) time, switch module T21, T22, T26 close, the control end of switch module T23 is electrically connected with electric capacity C21, and therefore keeps existing setting conducting state.Switch module T26 closes, switch module T25 is connected end 124 (and this second connection end 124 is connected) with the first DC source because its input is connected to second with control end, therefore this switch module T25 opens, and makes the control end of switch module T24 be in high potential thus opens conducting.Switch module T24, T23 turn on, and are transmitted to organic luminescent device 200 via input and outfan, the input of switch module T23 and the outfan of switch module T24 by the power supply signal of the first DC source output, and make Organic Light Emitting Diode 201 luminous.Owing to the voltage difference controlled between end and input of switch module T23 is kept by electric capacity C21, and this voltage difference has been arranged at when external control signal is effective in electric capacity C21, described voltage difference determines the size of current flowing through switch module T23, therefore, external control signal effective and invalid time, this voltage extent is identical, i.e. external voltage effective and invalid time, the size of current flowing through this switch module T23 is identical, that is, the power supply signal of this first DC source output is identical with external data signal size, thus, the Organic Light Emitting Diode 201 making the organic luminescent device 200 of different pixels has identical brightness, the defect of the brightness disproportionation that the difference between can solving because of different pixels is brought.
Refer to shown in Fig. 6 a and 6b, the schematic diagram of the 3rd embodiment of its pixel-driving circuit provided for the present invention, in the 3rd embodiment, switch module T31, T32, T33, T34 are respectively equivalent to first, second, third, fourth switch module 111,113,115,121, electric capacity C31 is equivalent to charge storage elements 131, switch module T35, T36 are equivalent to the 6th switch module and the 7th switch module, and a combination thereof is equivalent to phase inverter 125.The control end of switch module T31 is connected to the first signal input part 101, and its input is connected to secondary signal input 102, and outfan is connected to input and the input of switch module T34 of switch module T32.The control end of switch module T32 is connected to the first signal input part 101, and its outfan is connected to the control end of electric capacity C31 and switch module T33.The input of switch module T33 is connected to the second connection end 124, and its outfan is connected to the input of switch module T34.The end that controls of switch module T34 is connected to outfan and the outfan of switch module T36 of switch module T35.The switching characteristic of switch module T35 and switch module T36 is complementary, and it controls, and end is connected to the first signal input part 101, input is connected to the second connection end 124.The control end of switch module T36 is connected to the first signal input part 101, and its input is connected to the 3rd connection end 202.In this embodiment, switch module T31, T32, T33, T34, T35 are P-channel type thin film transistor (TFT), and switch module T36 is N-channel type thin film transistor (TFT).
When the external control signal on the first signal input part 101, effectively (row at pixel place is by addressing, in the present embodiment, external control signal is electronegative potential) time, this switch module T31, T32, T35 open conducting, switch module T36 is closed, thus the control end of the switch module T34 being connected with the outfan of switch module T35 is in high potential, therefore, switch module T34 is closed.Switch module T31, T32 turn on, switch module T33 is made to turn on, and make the power supply signal of the first DC source output arrive secondary signal input 102 through T33, T31, and the size of current of this power supply signal is equal with the size of current of external data signal, and sets on electric capacity C31 and keep its information of voltage.Now the Organic Light Emitting Diode 201 of organic luminescent device 200 is the most luminous.
When the external control signal on the first signal input part 101 is invalid, (the row addressing at pixel place terminates, in the present embodiment, external control signal is high potential) time, switch module T31, T32, T35 close, switch module T36 opens conducting, and makes the control end of switch module T34 be in low-voltage thus open conducting.And switch module T33 is owing to there being electric capacity C31 to keep it to control terminal potential, and then keep constant conduction, and the size of current flowing through this switch module T33 is identical with the size of current of external data signal.The power supply signal of the first DC source output transmits to organic luminescent device 200 via switch module T33, T34, and makes Organic Light Emitting Diode 201 luminous.In this embodiment, when the row at pixel place is by addressing, the Organic Light Emitting Diode 201 of organic luminescent device 200 is non-luminous, and after pixel addressing terminates, Organic Light Emitting Diode is just luminous.
Refer to Fig. 7 a, 7b, 7c, the schematic diagram of the 4th embodiment of its pixel-driving circuit provided for the present invention, in the 4th embodiment, switch module T41, T42, T43, T44 are respectively equivalent to first, second, third, fourth switch module 111,113,115,121, electric capacity C41 is equivalent to charge storage elements 131, switch module T45, T46 are equivalent to the 6th switch module and the 7th switch module, and a combination thereof is equivalent to phase inverter 125.The end that controls of switch module T43 is connected to the outfan of switch module T42 and first end of electric capacity C41, its input is electrically connected to the outfan of switch module T41, the outfan of switch module T44, and outfan is electrically connected to organic luminescent device 200 (corresponding diagram 7a)；Or it controls end and is connected to the outfan of switch module T41, and its input is connected to first end (corresponding diagram 7b) of switch module T42 outfan, electric capacity C41.The control end of switch module T42 is connected to the first signal input part 101, and input is electrically connected to the outfan of switch module T41, and outfan is electrically connected to electric capacity C41.The control end of switch module T45, T46 is connected to the first signal input part 101, its outfan is connected to the control end of switch module T44, the input of switch module T45 is connected to the second connection end 124, and the input of switch module T46 is connected to the 3rd connection end 202.In this embodiment, switch module T41, T42, T43, T44, T46 are N-channel type thin film transistor (TFT), and switch module T45 is P-channel type thin film transistor (TFT).The operation principle of the pixel-driving circuit shown in this embodiment is similar with above-mentioned several embodiments, is not repeated herein.
What deserves to be explained is, in Fig. 7 a, 7b, the input of switch module T46 is all connected to the 3rd described connection end 202.Owing to the negative electrode of Light-Emitting Diode 201 may will not be carried out at same processing step with the processing technology of thin film transistor (TFT) in processing technology, therefore, likely the input of switch module T46 is connected to another direct current signal input (the 4th connection end 203 shown in corresponding diagram 7c), but the present embodiment and all embodiments of the invention are all changed without essence by this change.This explanation is also applied for other and contains the embodiment being equivalent to phase inverter 125 assembly, repeats no more.
Refer to Fig. 8, the schematic diagram of the 5th embodiment of its pixel-driving circuit provided for the present invention, in the 5th embodiment, switch module T51, T52, T53, T54 are respectively equivalent to first, second, third, fourth switch module 111,113,115,121, and electric capacity C51 is equivalent to charge storage elements 131.The end that controls of switch module T53 is connected to outfan and one end of electric capacity C51 of switch module T52.Its input is electrically connected to the outfan of switch module T51, the outfan of switch module T54, and outfan is electrically connected to organic luminescent device 200.The control end of switch module T52 is connected to the first signal input part 101, and input is electrically connected to the outfan of switch module T51, and outfan is electrically connected to electric capacity C51.The other end of electric capacity C51 is connected to the second connection end 124, and the control end of switch module T54 is connected to the first signal input part 101, and its input is connected to the second connection end 124.In this embodiment, switch module T51, T52, T53 are N-channel type thin film transistor (TFT), and switch module T54 is P-channel type thin film transistor (TFT).In this embodiment, the switching characteristic of switch module T54 with other switch module because being equivalent to the 4th switch module 121 is complementary, therefore, in this embodiment, it is no longer necessary to arrange phase inverter, the operation principle of the pixel-driving circuit shown in this embodiment is similar with above-mentioned several embodiments, is not repeated herein.
Similar change between Fig. 7 a, 7b, 7c, can do same annexation change, become the still yet another form of the 5th embodiment the 5th embodiment shown in Fig. 8, and its image element circuit structure and operation principle are described again here.
Refer to Fig. 9, the schematic diagram of the sixth embodiment of its pixel-driving circuit provided for the present invention, similar to above-mentioned 5th embodiment in this sixth embodiment, differ only in sixth embodiment, switch module T61, T62 are P-channel type thin film transistor (TFT), switch module T64 is N-channel type thin film transistor (TFT), and the operation principle of the pixel-driving circuit shown in this sixth embodiment is similar with the 5th embodiment, is not repeated.
Above for the present invention provide active matrix organic light-emitting device pixel-driving circuit better embodiment; the restriction to rights protection scope of the present invention can not be interpreted as; those skilled in the art should know; without departing from the inventive concept of the premise; also can do multiple improvement or replacement; all of such improvement or replacement all should be in the scope of the present invention, i.e. the scope of the present invention should be as the criterion with claim.
Claims (9)
1. the pixel-driving circuit of an active matrix organic light-emitting device, including the first signal input part, secondary signal input, setting module, driving module and memory module, this first signal input part is connected with setting module and driving module respectively, for receiving an external control signal, and by this external control signal transmission to setting module and driving module；Secondary signal input is connected with setting module, for receiving an external data signal, and transmits this external data signal to setting module；Setting module is connected with memory module and driving module respectively, is used for responding described external control signal, and controls voltage according to described external control signal by described driving module settings one, and described memory module is used for storing described control voltage；Described driving module is for according to controlling Control of Voltage organic luminescent device；Described setting module at least includes that the first switch module, second switch assembly, the 3rd switch module, any one in described first, second, third switch module all include an input, an outfan, a control end；The control end of described first switch module is connected with described first signal input part, and its input is connected with described secondary signal input；The control end of described second switch assembly connects described first signal input part, and its input is connected with outfan or the secondary signal input of described first switch module；Described first switch module is opened with second switch assembly simultaneously or simultaneously closes off；The input of described 3rd switch module connects outfan or the outfan of second switch assembly of described first switch module, and its outfan is connected to organic luminescent device.
2. the pixel-driving circuit of active matrix organic light-emitting device as claimed in claim 1, it is characterized in that: described memory module at least includes that charge storage elements and first connects end, described charge storage elements includes the first end and the second end, second end is connected end and connects with described first, the outfan of this first end and the outfan of the first switch module or second switch assembly connects, and the end that controls of described 3rd switch module is connected to the first end of charge storage elements.
3. the pixel-driving circuit of active matrix organic light-emitting device as claimed in claim 2, it is characterized in that: described driving module at least includes the 4th switch module, the 5th switch module, the second connection end, 5th switch module and the 3rd switch module are same switch module, and the 4th switch module include an input, an outfan, one control end, the control end of the 4th switch module is connected to described first signal input part, its input is connected to described second and connects end, and outfan is connected to the input of described 3rd switch module；Or, the input of the 4th switch module is connected to described second by described 3rd switch module outfan and input and connects end, and its outfan is connected to described organic luminescent device；This organic luminescent device includes that Organic Light Emitting Diode and the 3rd connects end, and the outfan of described 3rd switch module is connected to the described 3rd by described Organic Light Emitting Diode and connects end.
4. the pixel-driving circuit of active matrix organic light-emitting device as claimed in claim 3, it is characterized in that: described first, second, third switch module is N-channel type thin film transistor (TFT), 4th switch module is P-channel type thin film transistor (TFT), it is same connection end that first connection end and second connects end, and is connected to one first DC source.
5. the pixel-driving circuit of active matrix organic light-emitting device as claimed in claim 3, it is characterized in that: described first, second switch module is P-channel type thin film transistor (TFT), three, the 4th switch modules are N-channel type thin film transistor (TFT), it is same connection end that first connection end and second connects end, and is connected to one first DC source.
6. the pixel-driving circuit of active matrix organic light-emitting device as claimed in claim 3, it is characterized in that: described driving module also includes phase inverter, described phase inverter is connected between described first signal input part and the control end of the 4th switch module, for changing external control signal, control the 4th switch module when making external control signal effective to close, control the 4th switch module when external control signal is invalid and open conducting；Described phase inverter includes the 6th switch module and the 7th switch module, described 4th switch module and first, second switch module complementary switch assembly each other；Six, the 7th switch modules all include an input, control end, an outfan, and the control end of the 6th switch module is connected to the first signal input part, and its input is connected to the second connection end, and outfan is connected to the control end of the 4th switch module；The control end of the 7th switch module and input are connected to the 3rd connection end, and its outfan is connected to the control end of described 4th switch module, and it is same connection end that described first connection end and second connects end, and is connected to one first DC source；Described first, second, third and fourth, six, seven switch modules are P-channel type thin film transistor (TFT).
7. the pixel-driving circuit of active matrix organic light-emitting device as claimed in claim 6, it is characterized in that: described driving module also includes phase inverter, described phase inverter is connected between described first signal input part and the control end of the 4th switch module, for changing external control signal, control the 4th switch module when making external control signal effective to close, control the 4th switch module when external control signal is invalid and open conducting；Described phase inverter includes the 6th switch module and the 7th switch module, described 4th switch module and first, second switch module complementary switch assembly each other；Six, the 7th switch modules all include an input, control end, an outfan, and the control end of the 6th switch module and input are connected to the second connection end, and its outfan is connected to the control end of the 4th switch module；The control end of the 7th switch module is connected to the first signal input part, its input is connected to the 3rd connection end, outfan is connected to the control end of described 4th switch module, and it is same connection end that described first connection end and second connects end, and is connected to one first DC source；Described first, second, third and fourth, six, seven switch modules are N-channel type thin film transistor (TFT).
8. the pixel-driving circuit of active matrix organic light-emitting device as claimed in claim 6, it is characterized in that: described driving module also includes phase inverter, described phase inverter is connected between described first signal input part and the control end of the 4th switch module, for changing external control signal, control the 4th switch module when making external control signal effective to close, control the 4th switch module when external control signal is invalid and open conducting；Described phase inverter includes the 6th switch module and the 7th switch module, described 4th switch module and first, second switch module complementary switch assembly each other；Six, the 7th switch modules all include an input, control end, an outfan, and the control end of the six, the 7th switch modules is connected to the first signal input part, and its outfan is connected to the control end of the 4th switch module；The input of described 6th switch module is connected to the second connection end, and the input of the 7th switch module is connected to the 3rd connection end；It is same connection end that described first connection end and second connects end, and is connected to one first DC source；Described first, second, third and fourth, seven switch modules are N-channel type thin film transistor (TFT), and the 6th switch module is P-channel type thin film transistor (TFT).
9. the pixel-driving circuit of active matrix organic light-emitting device as claimed in claim 2, it is characterized in that: described driving module at least includes the 4th switch module, 5th switch module, second connects end and phase inverter, described phase inverter includes the 6th switch module and the 7th switch module, 5th switch module and the 3rd switch module are same switch module, and the 4th, 6th, 7th switch module all includes an input, one outfan, one controls end, first end controlling end and charge storage elements of the 3rd switch module is connected to the outfan of second switch assembly, the input of the 3rd switch module is connected to the second connection end, its outfan is connected to the outfan of the first switch module, and the outfan of described 3rd switch module is connected to described organic luminescent device also by input and the outfan of the 4th switch module；The control end of the six, the 7th switch modules is connected to the first signal input part, and its outfan is connected to the control end of the 4th switch module；The input of the 6th switch module is connected to the second connection end, and the input of the 7th switch module is connected to the 3rd connection end；It is same connection end that described first connection end and second connects end, and is connected to one first DC source；Described first, second, third and fourth, six switch modules are P-channel type thin film transistor (TFT), and the 7th switch module is N-channel type thin film transistor (TFT).
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