CN204130142U - A kind of image element circuit, organic EL display panel and display device - Google Patents
A kind of image element circuit, organic EL display panel and display device Download PDFInfo
- Publication number
- CN204130142U CN204130142U CN201420678991.4U CN201420678991U CN204130142U CN 204130142 U CN204130142 U CN 204130142U CN 201420678991 U CN201420678991 U CN 201420678991U CN 204130142 U CN204130142 U CN 204130142U
- Authority
- CN
- China
- Prior art keywords
- node
- module
- switching transistor
- image element
- element circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The utility model discloses a kind of image element circuit, organic EL display panel and display device, this image element circuit carries out initialization at initial phase to first node and the 3rd node; At compensated stage, the threshold voltage compensation of driver module is carried out to first node; In data write phase, data write is carried out to first node; Drive the luminescent device in light emitting module luminous at glow phase driver module, achieve the normal luminous function of luminescent device, like this compared to image element circuit of the prior art, the image element circuit that the utility model embodiment provides can carry out initialization at initial phase to the control end of driver module, at compensated stage, the compensation of threshold voltage is carried out to driver module, avoid the change of the threshold voltage of driver module to the impact of the luminosity of luminescent device, improve the homogeneity of luminescent device luminosity, thus ensure that the quality of display frame.
Description
Technical field
The utility model relates to display technique field, particularly relates to a kind of image element circuit, organic EL display panel and display device.
Background technology
Along with the progress of display technique, increasing active matrix organic light-emitting diode (Active Matrix Organic Light Emitting Diode, AMOLED) display panel comes into the market, with traditional transistor liquid crystal display (TFT-LCD) panel (Thin Film Transistor Liquid Crystal Display, TFT LCD) compare, have that low energy consumption, production cost are low, autoluminescence, the advantage such as wide viewing angle and fast response time, at present, started progressively to replace traditional LCD display in display fields such as mobile phone, PDA, digital cameras.Utilize stable Control of Voltage brightness different from TFT LCD, AMOLED belongs to electric current and drives, and needs stable electric current to control luminescence.
The image element circuit of existing driving OLED luminescence, as shown in Figure 1, comprising: driving transistors M1, switching transistor M2, memory capacitance C and luminescent device OLED; Wherein, the grid of driving transistors M1 is connected with one end of memory capacitance C with the drain electrode of switching transistor M2 respectively, source electrode is connected with high voltage signal end VDD, draining is connected with one end of luminescent device OLED with the other end of memory capacitance respectively; The grid of switching transistor M2 is connected with sweep signal end Gate, source electrode is connected with data signal end Data; The other end of luminescent device OLED is connected with low voltage signal end VSS; When driving transistors M1 drives luminescent device OLED luminous, drive current is by high voltage signal end VDD, data signal end Data and driving transistors M1 co-controlling, because the luminosity of OLED is quite responsive to the change of its drive current, and driving transistors M1 cannot accomplish completely the same in manufacturing process, and due to manufacturing process and device aging, and the reason such as change of temperature in the course of work, the threshold voltage V of the driving transistors M1 in each image element circuit can be made
ththere is unevenness, which results in the electric current flowing through each pixel OLED and change and make display brightness uneven, thus affect the display effect of whole image.
Therefore, how to eliminate the change of drive transistor threshold voltage in image element circuit to the impact of the luminosity of luminescent device, ensureing the homogeneity of the electric current driving luminescent device OLED, thus ensure the quality of display frame, is those skilled in the art's problem demanding prompt solutions.
Utility model content
The utility model embodiment provides a kind of image element circuit, organic EL display panel and display device, in order to solve the problem of the luminosity of the variable effect luminescent device of drive transistor threshold voltage in the image element circuit that exists in prior art.
The utility model embodiment provides a kind of image element circuit, comprising: initialization module, charge control module, driver module, have the light emitting module of luminescent device; Wherein,
The control end of described driver module is connected with first node, and input end is connected with Section Point, and output terminal is connected with the input end of described light emitting module; The control end of described charge control module is connected with sweep signal end, and input end is connected with data signal end, and output terminal is connected with the 3rd node; Described initialization module be connected to described first node, described Section Point, described 3rd node, the first reference signal end, between the first signal control end and described sweep signal end; First control end of described light emitting module is connected with secondary signal control end, and the second control end is connected with luminous signal control end, and output terminal is connected with the second reference signal end;
At initial phase, described initialization module is used for carrying out initialization to described first node under the control of described sweep signal end, and described charge control module is used for carrying out initialization to described 3rd node under the control of described sweep signal end;
At compensated stage, described light emitting module is used for by the output terminal of described driver module and described second reference signal end conducting under the control of described secondary signal control end, and described initialization module for carrying out the threshold voltage compensation of described driver module under the control of described first signal control end and described sweep signal end to described first node;
In data write phase, described charge control module is used for carrying out data write by described initialization module to described first node under the control of described sweep signal end;
In glow phase, described initialization module is used for the input end conducting by described first reference signal end and described driver module under the control of described first signal control end, makes described driver module drive the described luminescent device in described light emitting module luminous.
In a kind of possible embodiment, in the above-mentioned image element circuit that the utility model embodiment provides, described driver module, specifically comprises: driving transistors;
The grid of described driving transistors is connected with described first node, and source electrode is connected with described Section Point, drains to be connected with the input end of described light emitting module.
In a kind of possible embodiment, in the above-mentioned image element circuit that the utility model embodiment provides, described initialization module, specifically comprises: the first switching transistor, second switch transistor and memory capacitance; Wherein,
The grid of described first switching transistor is connected with described sweep signal end, and source electrode is connected with described first reference signal end, drains to be connected with described first node;
The grid of described second switch transistor is connected with described first signal control end, and source electrode is connected with described first reference signal end, drains to be connected with described Section Point;
Described memory capacitance is connected between described first node and described 3rd node.
In a kind of possible embodiment, in the above-mentioned image element circuit that the utility model embodiment provides, described charge control module, specifically comprises: the 3rd switching transistor;
The grid of described 3rd switching transistor is connected with described sweep signal end, and source electrode is connected with described data signal end, drains to be connected with described 3rd node.
In a kind of possible embodiment, in the above-mentioned image element circuit that the utility model embodiment provides, described first switching transistor and described 3rd switching transistor are P-type crystal pipe simultaneously, or are N-type transistor simultaneously.
In a kind of possible embodiment, in the above-mentioned image element circuit that the utility model embodiment provides, described light emitting module, specifically comprises: luminescent device, the 4th switching transistor and the 5th switching transistor; Wherein,
The grid of described 4th switching transistor is connected with described secondary signal control end, source electrode is connected with the source electrode of described 5th switching transistor with the output terminal of described driver module respectively, and drain electrode is connected with described second reference signal end with the output terminal of described luminescent device respectively;
The grid of described 5th switching transistor is connected with described luminous signal control end, drains to be connected with the input end of described luminescent device.
The utility model embodiment provides a kind of organic EL display panel, comprises the above-mentioned image element circuit that the utility model embodiment provides.
The utility model embodiment provides a kind of display device, comprises the above-mentioned organic EL display panel that the utility model embodiment provides.
The beneficial effect of the utility model embodiment comprises:
The utility model embodiment provides a kind of image element circuit, organic EL display panel and display device, and this image element circuit is at initial phase, and initialization module carries out initialization to first node, and charge control module carries out initialization to the 3rd node, at compensated stage, light emitting module is by the output terminal of driver module and the second reference signal end conducting, and initialization module carries out the threshold voltage compensation of driver module to first node, in data write phase, charge control module carries out data write by initialization module to first node, in glow phase, initialization module is by the input end conducting of the first reference signal end and driver module, driver module is made to drive the luminescent device in light emitting module luminous, achieve the normal luminous function of luminescent device, like this compared to image element circuit of the prior art, the image element circuit that the utility model embodiment provides can carry out initialization at initial phase to the control end of driver module, at compensated stage, the compensation of threshold voltage is carried out to driver module, avoid the change of the threshold voltage of driver module to the impact of the luminosity of luminescent device, improve the homogeneity of luminescent device luminosity, thus ensure that the quality of display frame.
Accompanying drawing explanation
Fig. 1 is the structural representation of image element circuit of the prior art;
The structural representation of the image element circuit that Fig. 2 provides for the utility model embodiment;
Fig. 3 a and Fig. 3 b is respectively the concrete structure schematic diagram that the utility model implements the image element circuit provided;
Fig. 4 a and Fig. 4 b is respectively the time diagram of embodiment one that the utility model embodiment provides and embodiment two.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of image element circuit, organic EL display panel and display device that the utility model embodiment provides is described in detail.
The utility model embodiment provides a kind of image element circuit, as shown in Figure 2, comprising: initialization module 01, charge control module 02, driver module 03, have the light emitting module 05 of luminescent device 04; Wherein,
The control end of driver module 03 is connected with first node P1, and input end is connected with Section Point P2, and output terminal is connected with the input end of light emitting module 05; The control end of charge control module 02 is connected with sweep signal end Scan, and input end is connected with data signal end Data, and output terminal is connected with the 3rd node P3; Initialization module 01 be connected to first node P1, Section Point P2, the 3rd node P3, the first reference signal end Ref1, between the first signal control end E1 and sweep signal end Scan; First control end of light emitting module 05 is connected with secondary signal control end E2, and the second control end is connected with luminous signal control end EM, and output terminal is connected with the second reference signal end Ref2;
At initial phase, initialization module 01, under the control of sweep signal end Scan, carries out initialization to first node P1, and charge control module 02 for carrying out initialization to the 3rd node P3 under the control of sweep signal end Scan;
At compensated stage, light emitting module 05 under the control of secondary signal control end E2 by the output terminal of driver module 03 and the second reference signal end Ref2 conducting, initialization module 01 for carrying out the threshold voltage compensation of driver module 03 under the control of the first signal control end E1 and sweep signal end Scan to first node P1;
In data write phase, charge control module 02 for carrying out data write by initialization module 01 couple of first node P1 under the control of sweep signal end Scan;
In glow phase, initialization module 01 under the control of the first signal control end E1 by the input end conducting of the first reference signal end Ref1 and driver module 03, make driver module 03 drive the luminescent device 04 in light emitting module 05 luminous.
The above-mentioned image element circuit that the utility model embodiment provides, at initial phase, initialization module 01 couple of first node P1 carries out initialization, and charge control module 02 carries out initialization to the 3rd node P3, at compensated stage, light emitting module 05 is by the output terminal of driver module 03 and the second reference signal end Ref2 conducting, and initialization module 01 couple of first node P1 carries out the threshold voltage compensation of driver module 03, in data write phase, charge control module 02 carries out data write by initialization module 01 couple of first node P1, in glow phase, initialization module 01 is by the input end conducting of the first reference signal end Ref1 and driver module 03, driver module 03 is made to drive the luminescent device 04 in light emitting module 05 luminous, achieve the normal luminous function of luminescent device 04, like this compared to image element circuit of the prior art, the image element circuit that the utility model embodiment provides can carry out initialization at initial phase to the control end of driver module 03, at compensated stage, the bucking voltage of threshold voltage is carried out to driver module 03, avoid the change of the threshold voltage of driver module 03 to the impact of the luminosity of luminescent device 04, improve the homogeneity of luminescent device 04 luminosity, thus ensure that the quality of display frame.
In the specific implementation, in the above-mentioned image element circuit that the utility model embodiment provides, driver module 03, as shown in Figure 3 a and Figure 3 b shows, can specifically comprise: driving transistors D1; The grid of driving transistors D1 is connected with first node P1, and source electrode is connected with Section Point P2, drains to be connected with the input end of light emitting module 05.
Particularly, in the above-mentioned image element circuit that the utility model embodiment provides, as shown in Figure 3 a, driving transistors D1 can be N-type transistor; As shown in Figure 3 b, driving transistors D1 also can be P-type crystal pipe, in this no limit.In initialization time section, initialization module 01 under the control of sweep signal end Scan by the first reference signal end Ref1 and first node P1 conducting, initialization is carried out to the grid of first node P1 and driving transistors D1, makes driving transistors D1 be in saturated opening; At compensated stage, initialization module 01 and driving transistors D1 form discharge loop, by the tension discharge of first node P1 to the threshold voltage vt h of driving transistors D1, namely achieve the compensation of the threshold voltage to driving transistors D1; In data write phase, the data-signal that data signal end Data inputs is written to first node P1 by initialization module 01 by charge control module 02, namely carries out data write to the grid of driving transistors D1; In glow phase, initialization module 01 is by the source conduction of the first reference signal end Ref1 and driving transistors D1, the voltage signal inputted by first reference signal end Ref1, as driving voltage, makes driving transistors D1 drive the luminescent device 04 in light emitting module 05 luminous.
In the specific implementation, in the above-mentioned image element circuit that the utility model embodiment provides, as shown in Figure 3 a and Figure 3 b shows, initialization module 01, can specifically comprise: the first switching transistor T1, second switch transistor T2 and memory capacitance C1; Wherein, the grid of the first switching transistor T1 is connected with sweep signal end Scan, and source electrode is connected with the first reference signal end Ref1, drains to be connected with first node P1; The grid of second switch transistor T2 is connected with the first signal control end E1, and source electrode is connected with the first reference signal end Ref1, drains to be connected with Section Point P2; Memory capacitance C1 is connected between first node P1 and the 3rd node P3.
Particularly, in the above-mentioned image element circuit that the utility model embodiment provides, as shown in Figure 3 a, the first switching transistor T1 and second switch transistor T2 can be N-type transistor; As shown in Figure 3 b, the first switching transistor T1 and second switch transistor T2 can be P-type crystal pipe, in this no limit.At initial phase, the first switching transistor T1 conducting under the control of sweep signal end Scan, the first switching transistor T1 of conducting, by the first reference signal end Ref1 and first node P1 conducting, carries out initialization to first node P1; At compensated stage, first switching transistor T1 and second switch transistor T2 conducting under the control of sweep signal end Scan and the first signal control end E1 respectively, first switching transistor T1 of conducting and second switch transistor T2 and driving transistors D1 forms discharge loop, by the tension discharge of first node P1 to the threshold voltage vt h of driving transistors; In glow phase, second switch transistor T2 conducting under the control of the first signal control end E1, the second switch transistor T2 of conducting is by the source conduction of the first reference signal end Ref1 and driving transistors D1, the voltage signal inputted by first reference signal end Ref1, as driving voltage, makes driving transistors D1 drive the luminescent device 04 in light emitting module 05 luminous.
In the specific implementation, in the above-mentioned image element circuit that the utility model embodiment provides, as shown in Figure 3 a and Figure 3 b shows, charge control module 02, can specifically comprise: the 3rd switching transistor T3; The grid of the 3rd switching transistor T3 is connected with sweep signal end Scan, and source electrode is connected with data signal end Data, drains to be connected with the 3rd node P3.
Particularly, in the above-mentioned image element circuit that the utility model embodiment provides, as shown in Figure 3 a, the 3rd switching transistor T3 can be N-type transistor; As shown in Figure 3 b, the 3rd switching transistor T3 can be P-type crystal pipe, in this no limit.At initial phase, 3rd switching transistor T3 conducting under the control of sweep signal end Scan, 3rd switching transistor T3 of conducting is by data signal end Data and the 3rd node P3 conducting, and the voltage signal inputted by data signal end Data carries out initialization to the 3rd node P3; At compensated stage, the 3rd switching transistor T3 of same conducting keeps the voltage of the 3rd node P3 constant; In data write phase, the data-signal that data signal end Data inputs is written to the 3rd node P3 by the 3rd switching transistor T3 of same conducting.
In the specific implementation, in the above-mentioned image element circuit that the utility model embodiment provides, because the first switching transistor T1 and the 3rd switching transistor T3 adopts same sweep signal end Scan as control end, in order to realize two transistors under the control of same sweep signal end Scan, respective function is completed in different phase, therefore the first switching transistor T1 and the 3rd switching transistor T3 is set to same type transistor, as shown in Figure 3 a, first switching transistor T1 and described 3rd switching transistor T3 can be N-type transistor simultaneously, as shown in Figure 3 b, first switching transistor T1 and described 3rd switching transistor T3 can be also P-type crystal pipe simultaneously.
In the specific implementation, in the above-mentioned image element circuit that the utility model embodiment provides, as shown in Figure 3 a and Figure 3 b shows, light emitting module 05, specifically comprises: luminescent device 04, the 4th switching transistor T4 and the 5th switching transistor T5; Wherein, the grid of the 4th switching transistor T4 is connected with secondary signal control end E2, source electrode is connected with the source electrode of the 5th switching transistor T5 with the output terminal of driver module 03 respectively, and drain electrode is connected with the second reference signal end Ref2 with the output terminal of luminescent device 04 respectively; The grid of the 5th switching transistor T5 is connected with luminous signal control end EM, drains to be connected with the input end of luminescent device 04.
Particularly, in the above-mentioned image element circuit that the utility model embodiment provides, as shown in Figure 3 a, the 4th switching transistor T4 and the 5th switching transistor T5 can be N-type transistor; As shown in Figure 3 b, the 4th switching transistor T4 and the 5th switching transistor T5 can be P-type crystal pipe, in this no limit.At compensated stage, the 4th switching transistor T4 conducting under the control of secondary signal control end E2, the 4th switching transistor T4 of conducting is by the output terminal of driver module 03 and the second reference signal end Ref2 conducting; In data write phase, the 4th switching transistor T4 of same conducting keeps the voltage of the output terminal of driver module 03 constant; In glow phase, the 5th switching transistor T5 conducting under the control of luminous signal control end EM, the 5th switching transistor T5 of conducting, by the input end conducting of the output terminal of driver module 03 and luminescent device 04, makes driver module 03 drive luminescent device 04 luminous.
It should be noted that the switching transistor mentioned in the utility model embodiment and driving transistors can be thin film transistor (TFT) (TFT, Thin Film Transistor), also can be metal oxide semiconductor field effect tube (MOS, Metal Oxide Scmiconductor), do not limit at this.In concrete enforcement, source electrode and the drain electrode of these transistors can be exchanged, and do not do concrete differentiation.Be described for thin film transistor (TFT) when describing specific embodiment.
Further, the switching transistor mentioned in the above-mentioned image element circuit that the utility model embodiment provides and driving transistors all can adopt P-type crystal pipe or all adopt N-type transistor design, can simplify the fabrication processing of image element circuit like this.
The structure of the image element circuit provided below in conjunction with the utility model embodiment and time the ordered pair the utility model embodiment course of work of image element circuit that provides be described in detail: wherein, in embodiment one, the switching transistor of image element circuit and driving transistors all adopt N-type transistor design; In embodiment two, the switching transistor of image element circuit and driving transistors all adopt P-type crystal pipe to design.
Embodiment one: the input and output sequential chart of the image element circuit shown in composition graphs 3a and Fig. 3 a shown in Fig. 4 a, does to describe to the course of work of the image element circuit that the utility model embodiment provides.Particularly, the t1 ~ t4 four-stage in input and output sequential chart is as shown in fig. 4 a chosen.Represent high level signal with 1 in following description, 0 represents low level signal.
In the t1 stage, Scan=1, E1=0, E2=0, EM=0, Data=VL, Ref1=Vdd, Ref2=0.Due to Scan=1, therefore the first switching transistor T1, the 3rd switching transistor T3 conducting; Due to E1=0, E2=0, EM=0, therefore second switch transistor T2, the 4th switching transistor T4 and the 5th switching transistor T5 end.First switching transistor T1 of conducting is by the first reference signal end Ref1 and first node P1 conducting, initialization is carried out to first node P1, namely carry out initialization to the grid of driving transistors D1, now the voltage of first node P1 and the voltage of memory capacitance C1 right-hand member are Vdd; The voltage signal VL that data signal end Data inputs by the 3rd switching transistor T3 of conducting passes to the 3rd node P3, now the voltage of the 3rd node and the voltage of memory capacitance C1 left end are VL, be initialized to Vdd at this stage driving transistors D1 grid voltage, make driving transistors D1 be in the state of saturated unlatching.The t1 stage is initial phase.
In the t2 stage, Scan=1, E1=1, E2=1, EM=0, Data=VL, Ref1=Vdd, Ref2=0.Due to Scan=1, E1=1, E2=1, therefore the first switching transistor T1, second switch transistor T2, the 3rd switching transistor T3 and the 4th switching transistor T4 conducting; Due to EM=0, therefore the 5th switching transistor T5 ends.First switching transistor T1 of conducting and second switch transistor T2 and driving transistors D1 forms discharge loop, by the tension discharge of first node P1 to the threshold voltage vt h of driving transistors D1, namely now the voltage of the right-hand member of memory capacitance C1 is Vth, and now driving transistors D1 is in critical opening; 3rd switching transistor T3 of conducting keeps the voltage of the 3rd node P3 to be VL, and namely the voltage of memory capacitance C1 left end is still VL, and now the voltage difference at memory capacitance C1 two ends is VL-Vth; 4th switching transistor T4 of conducting is by the drain electrode of driving transistors D1 and the second reference signal end Ref2 conducting.The t2 stage is compensated stage.
In the t3 stage, Scan=1, E1=0, E2=1, EM=0, Data=Vdata, Ref1=Vdd, Ref2=0.Due to Scan=1, E2=1, therefore the first switching transistor T1, the 3rd switching transistor T3 and the 4th switching transistor T4 conducting; Due to E1=0, EM=0, therefore second switch transistor T2 and the 5th switching transistor T5 ends.First switching transistor T1 of conducting by the gate turn-on of the first reference signal end Ref1 and driving transistors D1, the drain electrode of the 4th switching transistor T4 driving transistors D1 of conducting and the second reference signal end Ref2 conducting; The data-signal Vdata that data signal end Data inputs by the 3rd switching transistor T3 of conducting passes to the 3rd node P3, therefore the Voltage Cortrol of memory capacitance C1 left end is Vdata, voltage difference due to memory capacitance C1 two ends remains the VL-Vth of the preceding paragraph, and therefore the voltage of memory capacitance C1 right-hand member and the voltage of first node P1 are Vdata-VL+Vth.The t3 stage is data write phase.
In the t4 stage, Scan=0, E1=1, E2=0, EM=1, Data=VL, Ref1=Vdd, Ref2=0.Due to E1=1, EM=1, therefore second switch transistor T2 and the 5th switching transistor T5 conducting; Due to Scan=0, E2=0, therefore the first switching transistor T1, the 3rd switching transistor T3 and the 4th switching transistor T4 end.The second switch transistor T2 of conducting is by the source conduction of the first reference signal end Ref1 and driving transistors D1,5th switching transistor T5 of conducting is by the input end conducting of the drain electrode of driving transistors D1 and luminescent device 04, the voltage signal inputted by first reference signal end Ref1, as driving voltage, makes driving transistors D1 drive luminescent device 04 luminous.From on last stage, driving transistors D1 grid voltage is Vdata-VL+Vth, and the drive current of therefore driving luminescent device 04 luminescence is: I=K (Vgs-Vth)
2=K (Vdata-VL+Vth-Vth)
2=K (Vdata-VL)
2wherein, Vgs is the voltage difference between driving transistors D1 grid and source electrode, K is the constant relevant with physical dimension with the technological parameter of driving transistors D1, it can thus be appreciated that, drive the drive current of luminescent device 04 luminescence and the threshold voltage of driving transistors D1 to have nothing to do, thus the change eliminating the threshold voltage of driving transistors D1 is on the impact of the luminosity of luminescent device 04, improves the homogeneity of the luminosity of luminescent device 04.The t4 stage is glow phase.
In follow-up time section, driving transistors D1 will keep opening, drive luminescent device 04 continuous illumination, until the high level signal of next sweep signal end Scan arrives.
Embodiment two: the input and output sequential chart of the image element circuit shown in composition graphs 3b and Fig. 3 b shown in Fig. 4 b, does to describe to the course of work of the image element circuit that the utility model embodiment provides.Particularly, the t1 ~ t4 four-stage in input and output sequential chart is as shown in Figure 4 b chosen.Represent high level signal with 1 in following description, 0 represents low level signal.
In the t1 stage, Scan=0, E1=1, E2=1, EM=1, Data=VL, Ref1=Vdd, Ref2=1.Due to Scan=0, therefore the first switching transistor T1, the 3rd switching transistor T3 conducting; Due to E1=1, E2=1, EM=1, therefore second switch transistor T2, the 4th switching transistor T4 and the 5th switching transistor T5 end.First switching transistor T1 of conducting is by the first reference signal end Ref1 and first node P1 conducting, initialization is carried out to first node P1, namely carry out initialization to the grid of driving transistors D1, now the voltage of first node P1 and the voltage of memory capacitance C1 right-hand member are Vdd; The voltage signal VL that data signal end Data inputs by the 3rd switching transistor T3 of conducting passes to the 3rd node P3, now the voltage of the 3rd node and the voltage of memory capacitance C1 left end are VL, be initialized to Vdd at this stage driving transistors D1 grid voltage, make driving transistors D1 be in the state of saturated unlatching.The t1 stage is initial phase.
In the t2 stage, Scan=0, E1=0, E2=0, EM=1, Data=VL, Ref1=Vdd, Ref2=1.Due to Scan=0, E1=0, E2=0, therefore the first switching transistor T1, second switch transistor T2, the 3rd switching transistor T3 and the 4th switching transistor T4 conducting; Due to EM=1, therefore the 5th switching transistor T5 ends.First switching transistor T1 of conducting and second switch transistor T2 and driving transistors D1 forms discharge loop, by the tension discharge of first node P1 to the threshold voltage vt h of driving transistors D1, namely now the voltage of the right-hand member of memory capacitance C1 is Vth, and now driving transistors D1 is in critical opening; 3rd switching transistor T3 of conducting keeps the voltage of the 3rd node P3 to be VL, and namely the voltage of memory capacitance C1 left end is still VL, and now the voltage difference at memory capacitance C1 two ends is VL-Vth; 4th switching transistor T4 of conducting is by the drain electrode of driving transistors D1 and the second reference signal end Ref2 conducting.The t2 stage is compensated stage.
In the t3 stage, Scan=0, E1=1, E2=0, EM=1, Data=Vdata, Ref1=Vdd, Ref2=1.Due to Scan=0, E2=0, therefore the first switching transistor T1, the 3rd switching transistor T3 and the 4th switching transistor T4 conducting; Due to E1=1, EM=1, therefore second switch transistor T2 and the 5th switching transistor T5 ends.First switching transistor T1 of conducting by the gate turn-on of the first reference signal end Ref1 and driving transistors D1, the drain electrode of the 4th switching transistor T4 driving transistors D1 of conducting and the second reference signal end Ref2 conducting; The data-signal Vdata that data signal end Data inputs by the 3rd switching transistor T3 of conducting passes to the 3rd node P3, therefore the Voltage Cortrol of memory capacitance C1 left end is Vdata, voltage difference due to memory capacitance C1 two ends remains the VL-Vth of the preceding paragraph, and therefore the voltage of memory capacitance C1 right-hand member and the voltage of first node P1 are Vdata-VL+Vth.The t3 stage is data write phase.
In the t4 stage, Scan=1, E1=0, E2=1, EM=0, Data=VL, Ref1=Vdd, Ref2=1.Due to E1=0, EM=0, therefore second switch transistor T2 and the 5th switching transistor T5 conducting; Due to Scan=1, E2=1, therefore the first switching transistor T1, the 3rd switching transistor T3 and the 4th switching transistor T4 end.The second switch transistor T2 of conducting is by the source conduction of the first reference signal end Ref1 and driving transistors D1,5th switching transistor T5 of conducting is by the input end conducting of the drain electrode of driving transistors D1 and luminescent device 04, the voltage signal inputted by first reference signal end Ref1, as driving voltage, makes driving transistors D1 drive luminescent device 04 luminous.From on last stage, driving transistors D1 grid voltage is Vdata-VL+Vth, and the drive current of therefore driving luminescent device 04 luminescence is: I=K (Vgs-Vth)
2=K (Vdata-VL+Vth-Vth)
2=K (Vdata-VL)
2wherein, Vgs is the voltage difference between driving transistors D1 grid and source electrode, K is the constant relevant with physical dimension with the technological parameter of driving transistors D1, it can thus be appreciated that, drive the drive current of luminescent device 04 luminescence and the threshold voltage of driving transistors D1 to have nothing to do, thus the change eliminating the threshold voltage of driving transistors D1 is on the impact of the luminosity of luminescent device 04, improves the homogeneity of the luminosity of luminescent device 04.The t4 stage is glow phase.
In follow-up time section, driving transistors D1 will keep opening, drive luminescent device 04 continuous illumination, until the low level signal of next sweep signal end Scan arrives.
Conceive based on same utility model, the utility model embodiment provides a kind of organic EL display panel, comprises the above-mentioned image element circuit that the utility model embodiment provides.The principle of dealing with problems due to this organic EL display panel is similar to image element circuit, and therefore the enforcement of this organic EL display panel see the enforcement of image element circuit, can repeat part and repeat no more.
Conceive based on same utility model, the utility model embodiment provides a kind of display device, comprises the above-mentioned organic EL display panel that the utility model embodiment provides.This display device can be: any product or parts with Presentation Function such as mobile phone, panel computer, televisor, display, notebook computer, digital album (digital photo frame), navigating instrument.The principle of dealing with problems due to this display device is similar to organic EL display panel, and therefore the enforcement of this display device see the enforcement of organic EL display panel, can repeat part and repeat no more.
The utility model embodiment provides a kind of image element circuit, organic EL display panel and display device, and this image element circuit is at initial phase, and initialization module carries out initialization to first node, and charge control module carries out initialization to the 3rd node, at compensated stage, light emitting module is by the output terminal of driver module and the second reference signal end conducting, and initialization module carries out the threshold voltage compensation of driver module to first node, in data write phase, charge control module carries out data write by initialization module to first node, in glow phase, initialization module is by the input end conducting of the first reference signal end and driver module, driver module is made to drive the luminescent device in light emitting module luminous, achieve the normal luminous function of luminescent device, like this compared to image element circuit of the prior art, the image element circuit that the utility model embodiment provides can carry out initialization at initial phase to the control end of driver module, at compensated stage, the compensation of threshold voltage is carried out to driver module, avoid the change of the threshold voltage of driver module to the impact of the luminosity of luminescent device, improve the homogeneity of luminescent device luminosity, thus ensure that the quality of display frame.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (8)
1. an image element circuit, is characterized in that, comprising: initialization module, charge control module, driver module, have the light emitting module of luminescent device; Wherein,
The control end of described driver module is connected with first node, and input end is connected with Section Point, and output terminal is connected with the input end of described light emitting module; The control end of described charge control module is connected with sweep signal end, and input end is connected with data signal end, and output terminal is connected with the 3rd node; Described initialization module be connected to described first node, described Section Point, described 3rd node, the first reference signal end, between the first signal control end and described sweep signal end; First control end of described light emitting module is connected with secondary signal control end, and the second control end is connected with luminous signal control end, and output terminal is connected with the second reference signal end;
At initial phase, described initialization module is used for carrying out initialization to described first node under the control of described sweep signal end, and described charge control module is used for carrying out initialization to described 3rd node under the control of described sweep signal end;
At compensated stage, described light emitting module is used for by the output terminal of described driver module and described second reference signal end conducting under the control of described secondary signal control end, and described initialization module for carrying out the threshold voltage compensation of described driver module under the control of described first signal control end and described sweep signal end to described first node;
In data write phase, described charge control module is used for carrying out data write by described initialization module to described first node under the control of described sweep signal end;
In glow phase, described initialization module is used for the input end conducting by described first reference signal end and described driver module under the control of described first signal control end, makes described driver module drive the described luminescent device in described light emitting module luminous.
2. image element circuit as claimed in claim 1, it is characterized in that, described driver module, specifically comprises: driving transistors;
The grid of described driving transistors is connected with described first node, and source electrode is connected with described Section Point, drains to be connected with the input end of described light emitting module.
3. image element circuit as claimed in claim 1, it is characterized in that, described initialization module, specifically comprises: the first switching transistor, second switch transistor and memory capacitance; Wherein,
The grid of described first switching transistor is connected with described sweep signal end, and source electrode is connected with described first reference signal end, drains to be connected with described first node;
The grid of described second switch transistor is connected with described first signal control end, and source electrode is connected with described first reference signal end, drains to be connected with described Section Point;
Described memory capacitance is connected between described first node and described 3rd node.
4. image element circuit as claimed in claim 3, it is characterized in that, described charge control module, specifically comprises: the 3rd switching transistor;
The grid of described 3rd switching transistor is connected with described sweep signal end, and source electrode is connected with described data signal end, drains to be connected with described 3rd node.
5. image element circuit as claimed in claim 4, it is characterized in that, described first switching transistor and described 3rd switching transistor are P-type crystal pipe simultaneously, or are N-type transistor simultaneously.
6. the image element circuit as described in any one of claim 1-5, is characterized in that, described light emitting module, specifically comprises: luminescent device, the 4th switching transistor and the 5th switching transistor; Wherein,
The grid of described 4th switching transistor is connected with described secondary signal control end, source electrode is connected with the source electrode of described 5th switching transistor with the output terminal of described driver module respectively, and drain electrode is connected with described second reference signal end with the output terminal of described luminescent device respectively;
The grid of described 5th switching transistor is connected with described luminous signal control end, drains to be connected with the input end of described luminescent device.
7. an organic EL display panel, is characterized in that, comprises the image element circuit as described in any one of claim 1-6.
8. a display device, is characterized in that, comprises organic EL display panel as claimed in claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420678991.4U CN204130142U (en) | 2014-11-13 | 2014-11-13 | A kind of image element circuit, organic EL display panel and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420678991.4U CN204130142U (en) | 2014-11-13 | 2014-11-13 | A kind of image element circuit, organic EL display panel and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204130142U true CN204130142U (en) | 2015-01-28 |
Family
ID=52386474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420678991.4U Withdrawn - After Issue CN204130142U (en) | 2014-11-13 | 2014-11-13 | A kind of image element circuit, organic EL display panel and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204130142U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104318897A (en) * | 2014-11-13 | 2015-01-28 | 合肥鑫晟光电科技有限公司 | Pixel circuit, organic electroluminescence display panel and display device |
| WO2018010511A1 (en) | 2016-07-11 | 2018-01-18 | Boe Technology Group Co., Ltd. | Electronic circuit and driving method, display panel, and display apparatus |
| CN107680536A (en) * | 2017-10-26 | 2018-02-09 | 京东方科技集团股份有限公司 | Image element circuit, its driving method and organic electroluminescence display panel, display device |
| CN112365842A (en) * | 2020-12-02 | 2021-02-12 | 合肥维信诺科技有限公司 | Pixel circuit, driving method thereof and display device |
| CN115331615A (en) * | 2022-08-29 | 2022-11-11 | 惠科股份有限公司 | Drive circuit and display panel |
-
2014
- 2014-11-13 CN CN201420678991.4U patent/CN204130142U/en not_active Withdrawn - After Issue
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104318897A (en) * | 2014-11-13 | 2015-01-28 | 合肥鑫晟光电科技有限公司 | Pixel circuit, organic electroluminescence display panel and display device |
| WO2016074359A1 (en) * | 2014-11-13 | 2016-05-19 | 京东方科技集团股份有限公司 | Pixel circuit, organic electroluminescence display panel, and display device and driving method therefor |
| CN104318897B (en) * | 2014-11-13 | 2017-06-06 | 合肥鑫晟光电科技有限公司 | A kind of image element circuit, organic EL display panel and display device |
| US9953569B2 (en) | 2014-11-13 | 2018-04-24 | Boe Technology Group Co., Ltd. | Pixel circuit, organic electroluminescent display panel, display apparatus and driving method thereof |
| WO2018010511A1 (en) | 2016-07-11 | 2018-01-18 | Boe Technology Group Co., Ltd. | Electronic circuit and driving method, display panel, and display apparatus |
| EP3482389A4 (en) * | 2016-07-11 | 2020-01-22 | Boe Technology Group Co. Ltd. | Electronic circuit and driving method, display panel, and display apparatus |
| CN107680536A (en) * | 2017-10-26 | 2018-02-09 | 京东方科技集团股份有限公司 | Image element circuit, its driving method and organic electroluminescence display panel, display device |
| CN112365842A (en) * | 2020-12-02 | 2021-02-12 | 合肥维信诺科技有限公司 | Pixel circuit, driving method thereof and display device |
| CN115331615A (en) * | 2022-08-29 | 2022-11-11 | 惠科股份有限公司 | Drive circuit and display panel |
| CN115331615B (en) * | 2022-08-29 | 2023-11-21 | 惠科股份有限公司 | Driving circuit and display panel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104318897A (en) | Pixel circuit, organic electroluminescence display panel and display device | |
| CN103886838B (en) | Pixel compensation circuit, array base palte and display device | |
| CN103971640B (en) | A kind of pixel-driving circuit and driving method thereof and display device | |
| CN104269133B (en) | A kind of image element circuit and organic EL display panel | |
| WO2017031909A1 (en) | Pixel circuit and drive method thereof, array substrate, display panel, and display apparatus | |
| CN104299571B (en) | A kind of image element circuit, organic EL display panel and display device | |
| CN103985352A (en) | Pixel compensation circuit and display device | |
| CN104809989A (en) | Pixel circuit, drive method thereof and related device | |
| CN104240639A (en) | Pixel circuit, organic electroluminescence display panel and display device | |
| CN104751804A (en) | Pixel circuit, driving method thereof and relevant device | |
| CN104835454A (en) | Organic electroluminescence touch control panel, driving method thereof and display device | |
| WO2015196730A1 (en) | Pixel circuit, driving method therefor and display device | |
| CN104409051A (en) | Pixel circuit, organic electroluminescent display panel and display device | |
| WO2016023311A1 (en) | Pixel drive circuit, pixel drive method and display apparatus | |
| CN105427800A (en) | Pixel circuit and driving method thereof, organic electroluminescent display panel, and display apparatus | |
| CN204130142U (en) | A kind of image element circuit, organic EL display panel and display device | |
| CN105096826A (en) | Pixel circuit and driving method thereof, array substrate and display device | |
| CN107464526A (en) | A kind of pixel compensation circuit, its driving method and display device | |
| CN205004016U (en) | Organic light -emitting diode's drive circuit | |
| CN105575327A (en) | Pixel circuit and driving method thereof, and organic electroluminescent display panel | |
| WO2015188519A1 (en) | Pixel circuit and display device | |
| WO2015192528A1 (en) | Pixel circuit and display device | |
| CN107369412B (en) | Pixel circuit, driving method thereof and display device | |
| US20160300531A1 (en) | Pixel circuit and display apparatus | |
| CN103208254A (en) | Pixel circuit and driving method thereof, array substrate and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150128 Effective date of abandoning: 20170606 |