CN203085137U - Pixel circuit, organic electroluminescence display panel and display device - Google Patents

Pixel circuit, organic electroluminescence display panel and display device Download PDF

Info

Publication number
CN203085137U
CN203085137U CN2013201013993U CN201320101399U CN203085137U CN 203085137 U CN203085137 U CN 203085137U CN 2013201013993 U CN2013201013993 U CN 2013201013993U CN 201320101399 U CN201320101399 U CN 201320101399U CN 203085137 U CN203085137 U CN 203085137U
Authority
CN
China
Prior art keywords
signal
links
light emitting
data
image
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.)
Active
Application number
CN2013201013993U
Other languages
Chinese (zh)
Inventor
马占洁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BOE Technology Group Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to CN2013201013993U priority Critical patent/CN203085137U/en
Application granted granted Critical
Publication of CN203085137U publication Critical patent/CN203085137U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The utility model discloses a pixel circuit, an organic electroluminescence display panel and a display device which are used for improving the uniformity of the image brightness of a display region of the display device. The pixel circuit comprises a capacitor, a light emitting device, a driving control sub-module, a charging and resetting sub-module and a light emitting control sub-module; a first end of the capacitor is a first node; a second end of the capacitor is a second node; a first end of the light emitting device is connected with a fifth end of the light emitting control sub-module; and a second end of the light emitting device is connected with a second reference signal end. When the charging and resetting sub-module is conducted, a data signal is written into the first node and a first end and a third end of the driving control sub-module are in short circuit connection, so that a voltage of the second node is reset and the capacitor is charged. When the light emitting control sub-module is conducted, the driving control sub-module is conducted with the light emitting device to drive the light emitting device to emit light.

Description

A kind of image element circuit, organic EL display panel and display device
Technical field
The utility model relates to technical field of organic electroluminescence, relates in particular to a kind of image element circuit, organic EL display panel and display device.
Background technology
Organic Light Emitting Diode (Organic Light Emitting Diode, OLED) display is low in energy consumption because of having, brightness is high, cost is low, the visual angle is wide, and advantage such as response speed is fast, receive much concern, obtained using widely in the organic light emission technical field.
In the OLED display, there is following unavoidable problem.At first, be used on the backboard realizing each transistor that image shows owing to have structural unevenness in manufacturing process, and the unevenness of electric property and stable aspect, transistorized threshold voltage V caused ThDrift has taken place.Secondly, transistor can cause stability decreases under the situation of long-time conducting.In addition, along with the development that the OLED size maximizes, correspondingly the load on the signal wire becomes big, causes voltage attenuation occurring on signal wire, changes such as operating voltage.
When using the existing structure driving OLED that is used for the luminous image element circuit of driving OLED to work, flow through the electric current of OLED and the threshold voltage V of driving transistors Th, the stability of driving transistors, reference voltage V RefIn one of them or wherein a plurality of factor relevant.When for each pixel applies identical drive signal, it is unequal that the electric current of each OLED is flow through in the backboard viewing area, causes the current unevenness on the backboard even, thereby cause brightness of image inhomogeneous.
The utility model content
The utility model embodiment provides a kind of image element circuit, organic EL display panel and display device, in order to improve the homogeneity of display device viewing area brightness of image.
The utility model embodiment provides a kind of image element circuit, comprising: luminescent device, electric capacity, drive controlling submodule, charging and resetting sub module and light emitting control submodule; Wherein,
First end of described electric capacity links to each other with first end of resetting sub module and first end of described light emitting control submodule with described charging respectively as first node, and second end of described electric capacity links to each other with second end of resetting sub module and first end of described drive controlling submodule with described charging respectively as Section Point;
Second end of described drive controlling submodule links to each other with the first reference signal end, the 3rd end of described drive controlling submodule links to each other with the 3rd end of resetting sub module and second end of described light emitting control submodule with described charging respectively, and described drive controlling submodule drives described luminescent device under the control of described Section Point luminous;
Described charging links to each other with the data-signal end with the 4th end of resetting sub module, described charging links to each other with the signal end with the five terminal of resetting sub module, and described charging and resetting sub module are transmitted the data-signal from described data-signal end under the control of signal end;
The 3rd end of described light emitting control submodule links to each other with the luminous signal end, the 4th end of described light emitting control submodule links to each other with the first reference signal end, the five terminal of described light emitting control submodule links to each other with first end of described luminescent device, second end of described luminescent device links to each other with the second reference signal end, and it is luminous that described light emitting control submodule is used for driving described luminescent device under the control of described luminous signal end.
A kind of organic EL display panel that the utility model embodiment provides comprises the image element circuit that the utility model embodiment provides.
A kind of display device that the utility model embodiment provides comprises the organic EL display panel that the utility model embodiment provides.
The beneficial effect of the utility model embodiment comprises:
A kind of image element circuit, organic EL display panel and display device that the utility model embodiment provides, this image element circuit comprises: luminescent device, electric capacity, drive controlling submodule, charging and resetting sub module and light emitting control submodule; Wherein, first end of electric capacity links to each other with first end of resetting sub module and first end of light emitting control submodule with charging respectively as first node, and second end links to each other with second end of resetting sub module and first end of drive controlling submodule with charging respectively as Section Point; Second end of drive controlling submodule links to each other with the first reference signal end, and the 3rd end links to each other with the 3rd end of resetting sub module and second end of light emitting control submodule with charging respectively; First end of luminescent device links to each other with the five terminal of light emitting control submodule, and second end links to each other with the second reference signal end.When the conducting of resetting sub module, the data-signal of data-signal end output is write first node in charging, and with first end of drive controlling submodule with and the 3rd end short circuit, the voltage of Section Point is resetted, realize charging process to electric capacity.When the conducting of light emitting control submodule, with drive controlling submodule and luminescent device conducting, the driven for emitting lights device is luminous.When the first reference signal end output dc voltage, the luminous voltage of driven for emitting lights device is relevant with the voltage of this DC voltage and data-signal; When the first reference signal end output AC voltage, the luminous voltage of driven for emitting lights device is only relevant with the voltage of data-signal, irrelevant with the threshold voltage in the drive controlling submodule, can avoid the influence of threshold voltage to luminescent device, promptly when using identical data-signal to be loaded into different pixel cells, can access the identical image of brightness, improve the homogeneity of display device viewing area brightness of image.
Description of drawings
The structural representation of the image element circuit that Fig. 1 provides for the utility model embodiment;
Fig. 2 a and Fig. 2 b are respectively the concrete structure synoptic diagram of the image element circuit that the utility model embodiment provides;
Fig. 3 a-Fig. 3 d is respectively the circuit timing diagram of the image element circuit that the utility model embodiment provides.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of image element circuit, organic EL display panel and the display device that the utility model embodiment is provided is described in detail.
A kind of image element circuit that the utility model embodiment provides as shown in Figure 1, comprising: luminescent device D1, capacitor C ST, drive controlling submodule 1, charging and resetting sub module 2 and light emitting control submodule 3; Wherein,
First end of capacitor C ST links to each other with first end a of resetting sub module 2 and the first end a ' of light emitting control submodule 3 with charging respectively as first node A, and second end of CST links to each other with second end b of resetting sub module 2 and the first end a ' ' of drive controlling submodule with charging respectively as Section Point B;
The second end b ' ' of drive controlling submodule 1 and the first reference signal end V Ref1 links to each other, and the 3rd end c ' ' of drive controlling submodule 1 links to each other with the 3rd end c of resetting sub module 2 and the second end b ' of light emitting control submodule 3 with charging respectively, and driven for emitting lights device D1 under the control of Section Point is luminous for drive controlling submodule 1;
Charging links to each other with data-signal end DATA with the 4th end d of resetting sub module 2, charging links to each other with signal end GATE with the five terminal e of resetting sub module 2, and charging and resetting sub module are transmitted the data-signal from data-signal end DATA under the control of signal end GATE;
The 3rd end c ' of light emitting control submodule 3 links to each other with luminous signal end EMISSION, the 4th end d ' of light emitting control submodule and the first reference signal end V Ref1 links to each other, and the five terminal e ' of light emitting control submodule 3 links to each other with the first end x of luminescent device D1, the second end y of luminescent device D1 and the second reference signal end V Ref2 link to each other, and it is luminous that light emitting control submodule 3 is used under the control of luminous signal end EMISSION driven for emitting lights device D1.
Further, in the above-mentioned image element circuit that the utility model embodiment provides, the first reference signal end V Ref1 signal that receives is direct current signal or AC signal, i.e. the first reference signal end V Ref1 is connected in dc signal source or ac signal which; The second reference signal end V Ref2 signals that receive are direct current signal, i.e. the second reference signal end V Ref2 are connected in dc signal source.At the first reference signal end V RefDuring 1 output dc voltage, can guarantee the driving voltage that luminescent device D1 is luminous and the voltage V of this DC voltage and data-signal DATARelevant; At the first reference signal end V RefDuring 1 output AC voltage, the luminous driving voltage of luminescent device D1 only with the voltage V of data-signal DATARelevant, all with the threshold voltage V of driving transistors T0 ThIrrelevant, can avoid threshold voltage V ThTo the influence of luminescent device D1, promptly when using identical data-signal to be loaded into different pixel cells, can access the identical image of brightness, improved the homogeneity of display device viewing area brightness of image.
Need to prove that driving transistors and the switching transistor mentioned in the utility model following examples can be thin film transistor (TFT) (TFT, Thin Film Transistor), also can be metal oxide semiconductor field effect tube (MOS, Metal Oxide Scmiconductor), particularly, these transistors can be the N transistor npn npns, also can be the P transistor npn npns, do not do qualification at this.In following examples, these transistorized source electrodes and drain electrode can be exchanged, and do not do concrete differentiation.When describing specific embodiment, all be thin film transistor (TFT) (TFT), and an end that has arrow in three electrodes with TFT in the accompanying drawing serve as that drain electrode is that example describes with driving transistors and switching transistor.
In the specific implementation, the drive controlling submodule 1 in the above-mentioned image element circuit that the utility model embodiment provides specifically comprises driving transistors T0, and wherein, the grid of driving transistors T0 links to each other with Section Point B, its source electrode and the first reference signal end V Ref1 links to each other, and drain electrode links to each other with the second end b ' of light emitting control submodule.
In the specific implementation, the luminescent device D1 in the above-mentioned image element circuit that provides of the utility model embodiment is generally Organic Light Emitting Diode (OLED).Luminescent device D1 realizes luminous demonstration under the effect of driving transistors T0 ON state current.
The principle of work of the above-mentioned image element circuit that the utility model embodiment is provided briefly introduces below.
Particularly, the work of the above-mentioned image element circuit that provides of the utility model embodiment is divided into two stages:
Phase one: the data write phase, image element circuit has realized that the data-signal of first node writes in this stage, has also realized the voltage reset function of Section Point simultaneously.In this stage, light emitting control submodule 3 is in closed condition; Charging is in conducting state with resetting sub module 2, the voltage V of the data-signal of data-signal end output DATABe loaded into first node A by charging and resetting sub module 2, be capacitor C ST charging; Simultaneously, the charging of conducting and resetting sub module 2 have realized the threshold voltage V of driving transistors T0 with drain electrode and the grid short circuit of driving transistors T0 at Section Point B place ThStorage and reset function.
Subordinate phase: glow phase, in this stage, charging is in closed condition with resetting sub module 2; Light emitting control submodule 3 is in conducting state, the first end x of conducting luminescent device D1 and the drain electrode of driving transistors T0, driving transistors T0 is according to the voltage and the corresponding voltage turn-on of capacitor C ST discharge of the reference signal that is loaded into source electrode, and D1 is luminous for the driven for emitting lights device.
Need to prove, in the specific implementation, when driving transistors T0 is the P transistor npn npn, its threshold voltage V ThBe negative value, the first reference signal end V Ref1 voltage is greater than the second reference signal end V Ref2 voltage, shown in Fig. 2 a, first end of the just very luminescent device of luminescent device D1 links to each other with light emitting control submodule 3 at this moment; When driving transistors T0 is the N transistor npn npn, its threshold voltage V ThFor on the occasion of, the first reference signal end V Ref1 voltage is less than the second reference signal end V Ref2 voltage, shown in Fig. 2 b, this moment, the negative pole of luminescent device D1 was first end of luminescent device, linked to each other with light emitting control submodule 3.
The charging in the above-mentioned image element circuit that the utility model embodiment is provided and the concrete structure and the principle of work of resetting sub module 2 and light emitting control submodule 3 are elaborated below.
Particularly, in the image element circuit that the utility model embodiment provides, charging and resetting sub module 2 shown in Fig. 2 a and Fig. 2 b, specifically can comprise: the first switching transistor T1 and second switch transistor T 2; Wherein,
The grid of the first switching transistor T1 links to each other with signal end GATE, and source electrode links to each other with data-signal end DATA, and drain electrode links to each other with first node A;
The grid of second switch transistor T 2 links to each other with signal end GATE, and source electrode links to each other with Section Point B, and drain electrode is that the drain electrode of driving transistors T0 links to each other with the 3rd end of drive controlling submodule.
It should be noted that in the specific implementation when the first switching transistor T1 and second switch transistor T 2 were the P transistor npn npn, its grid just can be opened when the signal of signal end output low level.When the first switching transistor T1 and second switch transistor T 2 were the N transistor npn npn, its grid just can be opened when the signal of signal end output high level.
Particularly, in the image element circuit that the utility model embodiment provides, light emitting control submodule 3 shown in Fig. 2 a and Fig. 2 b, specifically can comprise:
The 3rd switching transistor T3 and the 4th switching transistor T4; Wherein,
The grid of the 3rd switching transistor T3 links to each other with luminous signal end EMISSION, the source electrode and the first reference edge V Ref1 links to each other, and drain electrode links to each other with first node A;
The grid of the 4th switching transistor T4 links to each other with luminous signal end EMISSION, and source electrode and the 3rd end of drive controlling submodule are that the drain electrode of driving transistors T0 links to each other, and drain electrode links to each other with first end of luminescent device D1.
It should be noted that in the specific implementation when the 3rd switching transistor T3 and the 4th switching transistor T4 were the P transistor npn npn, its grid just can be opened when the luminous signal of luminous signal end output low level.When the 3rd switching transistor T3 and the 4th switching transistor T4 were the N transistor npn npn, its grid just can be opened when the luminous signal of luminous signal end output high level.
Below by the image element circuit several concrete duty in the specific implementation that the utility model embodiment provides, specify the principle of work of image element circuit.
At the first reference signal end V Ref1 reference signal that receives is a direct current signal, and driving transistors T0, the first switching transistor T1, second switch transistor T 2, the 3rd switching transistor T3 and the 4th switching transistor T4 be when being the P transistor npn npn, this moment V Ref1 is high level signal, V Ref2 is low level signal, and the circuit signal sequential chart of image element circuit is shown in Fig. 3 a.In the case, the concrete principle of work of image element circuit is as follows:
Data write phase at image element circuit is the phase one, the signal of signal end GATE output is controlled the grid of the first switching transistor T1 and is opened, make the first switching transistor T1 become the connected mode of diode, the voltage of the data-signal of data-signal end DATA output writes and the first node A place that drains and be connected by the source electrode of the first switching transistor T1, and promptly the voltage of first node A becomes V DATA, realize that the data of first node A write.The signal of signal end GATE output is controlled the grid of second switch transistor T 2 simultaneously and is opened, make second switch transistor T 2 become the connected mode of diode, the drain and gate of conducting driving transistors T0, because driving transistors T0 is the P transistor npn npn, its threshold voltage V ThBe negative value, the first reference signal end V RefThe magnitude of voltage of 1 direct current signal is V m, therefore, the voltage at Section Point B place becomes V m+ V Th, realized threshold voltage V at Section Point B place ThStorage and the reset function that B is ordered.
Glow phase at image element circuit is a subordinate phase, the luminous signal of luminous signal end EMISSION output is controlled the grid of the 3rd switching transistor T3 and is opened, make the 3rd switching transistor T3 become the connected mode of diode, the voltage of first node A becomes and the first reference signal end V like this RefThe V that 1 voltage is identical m, according to the electric capacity principle of conservation of electricity, the voltage correspondence of Section Point B becomes V m-V DATA+ V m+ V Th=2V m-V DATA+ V ThAt this moment, the source electrode of driving transistors T0 and the voltage between the grid are V Gs=V g-V s=2V m-V DATA+ V Th-V m=V m-V DATA+ V Th
Because driving transistors T0 work is in state of saturation, according to the state of saturation current characteristics as can be known, the ON state current i of driving transistors T0 dSatisfy formula: i d = K 2 ( V gs - V th ) 2 = K 2 ( V m - V DATA + V th - V th ) 2 = K 2 ( V m - V DATA ) 2 , Wherein K is structural parameters, and this numerical value is relatively stable in the same structure, can be regarded as constant.From the derivation of equation as can be known, flow through driving transistors T0 leakage current only with the voltage V of data-signal DATAWith the first reference signal end V Ref1 voltage V mRelevant, with the threshold voltage V of driving transistors T0 ThIrrelevant.Therefore, with this ON state current i dD1 is luminous for the driven for emitting lights device, the V that the electric current of the OLED that flows through can not cause because of the backboard reasons ThThe inhomogeneous electric current difference that causes, thus cause that brightness changes.Can also improve because V simultaneously ThThe electric current of the luminescent device D1 that flows through that fails and cause changes, thereby causes that brightness changes, and makes luminescent device D1 bad stability.
At the first reference signal end V Ref1 reference signal that receives is an AC signal, and driving transistors T0, the first switching transistor T1, second switch transistor T 2, the 3rd switching transistor T3 and the 4th switching transistor T4 be when being the P transistor npn npn, this moment the second reference signal end V RefThe reference signal of 2 outputs is a low level signal, and the circuit signal sequential chart of image element circuit is shown in Fig. 3 b.In the case, the concrete principle of work of image element circuit is as follows:
Data write phase at image element circuit is the phase one, the signal of signal end GATE output is controlled the grid of the first switching transistor T1 and is opened, make the first switching transistor T1 become the connected mode of diode, the data-signal of data-signal end DATA output writes and the first node A place that drains and be connected by the source electrode of the first switching transistor T1, and promptly the voltage of first node A becomes V DATA, realize that the data of first node A write.The signal of signal end GATE output is controlled the grid of second switch transistor T 2 simultaneously and is opened, make second switch transistor T 2 become the connected mode of diode, the drain and gate of conducting driving transistors T0, because driving transistors T0 is the P transistor npn npn, its threshold voltage V ThBe negative value, and the first reference signal end V of this moment Ref1 voltage is V 1, therefore, the voltage at Section Point B place becomes V 1+ V Th, realized threshold voltage V at Section Point B place ThStorage and the reset function that B is ordered.
Glow phase at image element circuit is a subordinate phase, at this moment the first reference signal end V Ref1 voltage becomes V 2,, and V 2V 1, the luminous signal of luminous signal end EMISSION output is controlled the grid of the 3rd switching transistor T3 and is opened, and makes the 3rd switching transistor T3 become the connected mode of diode, and the voltage of first node A becomes and the first reference signal end V like this Ref1 V 2Identical, according to the electric capacity principle of conservation of electricity, the voltage correspondence of Section Point B becomes V 2-V DATA+ V 1+ V ThAt this moment, the source electrode of driving transistors T0 and the voltage between the grid are V Gs=V g-V s=V 2-V DATA+ V 1+ V Th-V 2=V 1-V DATA+ V Th
Because driving transistors T0 work is in state of saturation, according to the state of saturation current characteristics as can be known, the ON state current i of driving transistors T0 dSatisfy formula: i d = K 2 ( V gs - V th ) 2 = K 2 ( V 1 - V DATA + V th - V th ) 2 = K 2 ( V 1 - V DATA ) 2 , Wherein K is structural parameters, and this numerical value is relatively stable in the same structure, can be regarded as constant.And in the utility model embodiment the common first reference signal end V RefThe V of 1 output 1Be generally 0 volt.Therefore, from the derivation of equation as can be known, the leakage current of the driving transistors T0 that flows through only with the voltage V of data-signal DATARelevant, with the threshold voltage V of driving transistors T0 ThIrrelevant with reference signal.Therefore, with this ON state current i dD1 is luminous for the driven for emitting lights device, the V that the electric current of the OLED that flows through can not cause because of the backboard reasons ThThe inhomogeneous electric current difference that causes, thus cause that brightness changes.Can also improve because V simultaneously ThThe electric current of the luminescent device D1 that flows through that fails and cause changes, thereby causes that brightness changes, and makes luminescent device D1 bad stability.Further, also compensated because V RefOn 1 signal wire because V that load-reason caused Ref1IR Drop, and the current difference that causes causes the problem of demonstration.
At the first reference signal end V Ref1 reference signal that receives is a direct current signal, and when driving transistors T0, the first switching transistor T1, second switch transistor T 2, the 3rd switching transistor T3 and the 4th switching transistor T4 were the N transistor npn npn, the circuit signal sequential chart of image element circuit was shown in Fig. 3 c.At this moment, the first reference signal end V Ref1 reference signal is a low level signal, the second reference signal end V Ref2 reference signal is a high level signal.In the case, the concrete principle of work of image element circuit is as follows:
Data write phase at image element circuit is the phase one, the signal of signal end GATE output is controlled the grid of the first switching transistor T1 and is opened, make the first switching transistor T1 become the connected mode of diode, the voltage of the data-signal of data-signal end DATA output writes and the first node A place that drains and be connected by the source electrode of the first switching transistor T1, and promptly the voltage of first node A becomes V DATA, realize that the data of first node A write.The signal of signal end GATE output is controlled the grid of second switch transistor T 2 simultaneously and is opened, make second switch transistor T 2 become the connected mode of diode, the drain and gate of conducting driving transistors T0, because driving transistors T0 is the N transistor npn npn, its threshold voltage V ThFor on the occasion of, the first reference signal end V RefThe magnitude of voltage of 1 direct current signal is V n, therefore, the voltage at Section Point B place becomes V n+ V Th, realized threshold voltage V at Section Point B place ThStorage and the reset function that B is ordered.
Glow phase at image element circuit is a subordinate phase, the luminous signal of luminous signal end EMISSION output is controlled the grid of the 3rd switching transistor T3 and is opened, make the 3rd switching transistor T3 become the connected mode of diode, the voltage of first node A becomes and the first reference signal end V like this RefThe V that 1 voltage is identical n, according to the electric capacity principle of conservation of electricity, the voltage correspondence of Section Point B becomes V n-V DATA+ V n+ V Th=2V n-V DATA+ V ThAt this moment, the source electrode of driving transistors T0 and the voltage between the grid are V Gs=V g-V s=2V n-V DATA+ V Th-V n=V n-V DATA+ V Th
Because driving transistors T0 work is in state of saturation, according to the state of saturation current characteristics as can be known, the ON state current i of driving transistors T0 dSatisfy formula: i d = K 2 ( V gs - V th ) 2 = K 2 ( V n - V DATA + V th - V th ) 2 = K 2 ( V n - V DATA ) 2 , Wherein K is structural parameters, and this numerical value is relatively stable in the same structure, can be regarded as constant.From the derivation of equation as can be known, flow through driving transistors T0 leakage current only with the voltage V of data-signal DATAVoltage V with the first reference signal end nRelevant, with the threshold voltage V of driving transistors T0 ThIrrelevant.Therefore, with this ON state current current i dD1 is luminous for the driven for emitting lights device, the V that the electric current of the OLED that flows through can not cause because of the backboard reasons ThThe inhomogeneous electric current difference that causes, thus cause that brightness changes.Can also improve because V simultaneously ThThe electric current of the luminescent device D1 that flows through that fails and cause changes, thereby causes that brightness changes, and makes luminescent device D1 bad stability.
At the first reference signal end V Ref1 reference signal that receives is an AC signal, and driving transistors T0, the first switching transistor T1, second switch transistor T 2, the 3rd switching transistor T3 and the 4th switching transistor T4 be when being the N transistor npn npn, this moment the second reference signal end V RefThe reference signal of 2 outputs is a high level signal, and the circuit signal sequential chart of image element circuit is shown in Fig. 3 d.In the case, the concrete principle of work of image element circuit is as follows:
Data write phase at image element circuit is the phase one, the signal of signal end GATE output is controlled the grid of the first switching transistor T1 and is opened, make the first switching transistor T1 become the connected mode of diode, the voltage of the data-signal of data-signal end DATA output writes and the first node A place that drains and be connected by the source electrode of the first switching transistor T1, and promptly the voltage of first node A becomes V DATA, realize that the data of first node A write.The signal of signal end GATE output is controlled the grid of second switch transistor T 2 simultaneously and is opened, make second switch transistor T 2 become the connected mode of diode, the drain and gate of conducting driving transistors T0, because driving transistors T0 is the N transistor npn npn, its threshold voltage V ThFor on the occasion of, and this moment the first reference signal end V Ref1 voltage is V 3, therefore, the voltage at Section Point B place becomes V 3+ V Th, realized threshold voltage V at Section Point B place ThStorage and the reset function that B is ordered.
Glow phase at image element circuit is a subordinate phase, at this moment the first reference signal end V Ref1 voltage is V 4,, and V 4<V 3, the luminous signal of luminous signal end EMISSION output is controlled the grid of the 3rd switching transistor T3 and is opened, and makes the 3rd switching transistor T3 become the connected mode of diode, and the voltage of first node A becomes and the first reference signal end V like this RefThe V of 1 output 4Identical, according to the electric capacity principle of conservation of electricity, the voltage correspondence of Section Point B becomes V 4-V DATA+ V 3+ V ThAt this moment, the source electrode of driving transistors T0 and the voltage between the grid are V Gs=V g-V s=V 4-V DATA+ V 3+ V Th-V 4=V 3-V DATA+ V Th
Because driving transistors T0 work is in state of saturation, according to the state of saturation current characteristics as can be known, the ON state current i of driving transistors T0 dSatisfy formula: i d = K 2 ( V gs - V th ) 2 = K 2 ( V 3 - V DATA + V th - V th ) 2 = K 2 ( V 3 - V DATA ) 2 , Wherein K is structural parameters, and this numerical value is relatively stable in the same structure, can be regarded as constant.And in the utility model embodiment the common first reference signal end V RefThe V of 1 output 3Be generally 0 volt.Therefore, from the derivation of equation as can be known, the leakage current of the driving transistors T0 that flows through only with the voltage V of data-signal DATARelevant, with the threshold voltage V of driving transistors T0 ThIrrelevant with reference signal.Therefore, with this ON state current i dD1 is luminous for the driven for emitting lights device, the V that the electric current of the OLED that flows through can not cause because of the backboard reasons ThThe inhomogeneous electric current difference that causes, thus cause that brightness changes.Can also improve because V simultaneously ThThe electric current of the luminescent device D1 that flows through that fails and cause changes, thereby causes that brightness changes, and makes luminescent device D1 bad stability.Further, also compensated because V RefOn 1 signal wire because V that load-reason caused Ref1IR Drop, and the current difference that causes causes the problem of demonstration.
Based on same utility model design, the utility model embodiment also provides a kind of organic EL display panel, comprise the above-mentioned image element circuit that the utility model embodiment provides, because the principle that this organic EL display panel is dealt with problems is similar to aforementioned a kind of image element circuit, therefore the enforcement of this organic EL display panel can repeat part and repeat no more referring to the enforcement of image element circuit.
Based on same utility model design, the utility model embodiment also provides a kind of display device, comprise the above-mentioned organic EL display panel that the utility model embodiment provides, this display device can be display, mobile phone, TV, notebook, all-in-one etc., be for other requisite ingredient of display device and will be understood by those skilled in the art that to have, do not do at this and to give unnecessary details, should be as to restriction of the present utility model yet.
A kind of image element circuit, organic EL display panel and display device that the utility model embodiment provides comprise: electric capacity, luminescent device, drive controlling submodule, charging and resetting sub module and light emitting control submodule; Wherein, first end of electric capacity links to each other with first end of resetting sub module and first end of light emitting control submodule with charging respectively as first node, and second end links to each other with second end of resetting sub module and first end of drive controlling submodule with charging respectively as Section Point; Second end of drive controlling submodule links to each other with the first reference signal end, and the 3rd end links to each other with the 3rd end of resetting sub module and second end of light emitting control submodule with charging respectively; First end of luminescent device links to each other with the five terminal of light emitting control submodule, and second end links to each other with the second reference signal end.When the conducting of resetting sub module, the data-signal of data-signal end output is write first node in charging, and with first end of drive controlling submodule with and the 3rd end short circuit, the voltage of Section Point is resetted, realize charging process to electric capacity.When the conducting of light emitting control submodule, with drive controlling submodule and luminescent device conducting, the driven for emitting lights device is luminous.When the first reference signal end output dc voltage, the luminous voltage of driven for emitting lights device is relevant with the voltage of this DC voltage and data-signal; When the first reference signal end output AC voltage, the luminous voltage of driven for emitting lights device is only relevant with the voltage of data-signal, irrelevant with the threshold voltage in the drive controlling submodule, can avoid the influence of threshold voltage to luminescent device, promptly when using identical data-signal to be loaded into different pixel cells, can access the identical image of brightness, improve the homogeneity of display device viewing area brightness of image.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.

Claims (9)

1. an image element circuit is characterized in that, comprising: luminescent device, electric capacity, drive controlling submodule, charging and resetting sub module and light emitting control submodule; Wherein,
First end of described electric capacity links to each other with first end of resetting sub module and first end of described light emitting control submodule with described charging respectively as first node, and second end of described electric capacity links to each other with second end of resetting sub module and first end of described drive controlling submodule with described charging respectively as Section Point;
Second end of described drive controlling submodule links to each other with the first reference signal end, the 3rd end of described drive controlling submodule links to each other with the 3rd end of resetting sub module and second end of described light emitting control submodule with described charging respectively, and described drive controlling submodule drives described luminescent device under the control of described Section Point luminous;
Described charging links to each other with the data-signal end with the 4th end of resetting sub module, described charging links to each other with the signal end with the five terminal of resetting sub module, and described charging and resetting sub module are transmitted the data-signal from described data-signal end under the control of signal end;
The 3rd end of described light emitting control submodule links to each other with the luminous signal end, the 4th end of described light emitting control submodule links to each other with the first reference signal end, the five terminal of described light emitting control submodule links to each other with first end of described luminescent device, second end of described luminescent device links to each other with the second reference signal end, and it is luminous that described light emitting control submodule is used for driving described luminescent device under the control of described luminous signal end.
2. image element circuit as claimed in claim 1 is characterized in that, the described first reference signal end is connected in dc signal source or ac signal which.
3. image element circuit as claimed in claim 1 is characterized in that, the described second reference signal end is connected in dc signal source.
4. image element circuit as claimed in claim 1 is characterized in that, described drive controlling submodule specifically comprises: driving transistors, wherein,
The grid of described driving transistors links to each other with Section Point, and source electrode links to each other with the first reference signal end, and drain electrode links to each other with second end of described light emitting control submodule.
5. as each described image element circuit of claim 1-4, it is characterized in that described charging and resetting sub module specifically comprise: first switching transistor and second switch transistor; Wherein,
The grid of first switching transistor links to each other with the signal end, and source electrode links to each other with the data-signal end, and drain electrode links to each other with first node;
The transistorized grid of second switch links to each other with the signal end, and source electrode links to each other with Section Point, and drain electrode links to each other with the 3rd end of described drive controlling submodule.
6. as each described image element circuit of claim 1-4, it is characterized in that described light emitting control submodule comprises: the 3rd switching transistor and the 4th switching transistor; Wherein,
The grid of the 3rd switching transistor links to each other with the luminous signal end, and source electrode links to each other with the first reference signal end, and drain electrode links to each other with first node;
The grid of the 4th switching transistor links to each other with the luminous signal end, and source electrode links to each other with the 3rd end of described drive controlling submodule, and drain electrode links to each other with first end of described luminescent device.
7. image element circuit as claimed in claim 4 is characterized in that, described driving transistors is the P transistor npn npn, first end of the just very described luminescent device of described luminescent device; Described driving transistors is the N transistor npn npn, and the negative pole of described luminescent device is first end of described luminescent device.
8. an organic EL display panel is characterized in that, comprises each described image element circuit as claim 1-7.
9. a display device is characterized in that, comprises organic EL display panel as claimed in claim 8.
CN2013201013993U 2013-03-06 2013-03-06 Pixel circuit, organic electroluminescence display panel and display device Active CN203085137U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2013201013993U CN203085137U (en) 2013-03-06 2013-03-06 Pixel circuit, organic electroluminescence display panel and display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2013201013993U CN203085137U (en) 2013-03-06 2013-03-06 Pixel circuit, organic electroluminescence display panel and display device

Publications (1)

Publication Number Publication Date
CN203085137U true CN203085137U (en) 2013-07-24

Family

ID=48830955

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2013201013993U Active CN203085137U (en) 2013-03-06 2013-03-06 Pixel circuit, organic electroluminescence display panel and display device

Country Status (1)

Country Link
CN (1) CN203085137U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103198788A (en) * 2013-03-06 2013-07-10 京东方科技集团股份有限公司 Pixel circuit, organic electroluminescence display panel and display device
WO2015018161A1 (en) * 2013-08-07 2015-02-12 京东方科技集团股份有限公司 Oled alternating-current driving circuit, driving method and display device
CN105609055A (en) * 2016-03-25 2016-05-25 京东方科技集团股份有限公司 Pixel circuit and driving method thereof and display device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103198788A (en) * 2013-03-06 2013-07-10 京东方科技集团股份有限公司 Pixel circuit, organic electroluminescence display panel and display device
WO2015018161A1 (en) * 2013-08-07 2015-02-12 京东方科技集团股份有限公司 Oled alternating-current driving circuit, driving method and display device
US9286831B2 (en) 2013-08-07 2016-03-15 Boe Technology Group Co., Ltd. AC drive circuit for OLED, drive method and display apparatus
CN105609055A (en) * 2016-03-25 2016-05-25 京东方科技集团股份有限公司 Pixel circuit and driving method thereof and display device
US10176757B2 (en) 2016-03-25 2019-01-08 Boe Technology Group Co., Ltd. Pixel circuit and driving method thereof, and display device

Similar Documents

Publication Publication Date Title
US9496293B2 (en) Pixel circuit and method for driving the same, display panel and display apparatus
US11024228B2 (en) Pixel circuit, driving method therefor and display device
CN103268749B (en) Phase inverter, AMOLED (Active Matrix/Organic Light Emitting Diode) compensating circuit and display panel
US8963907B2 (en) Pixel circuit and driving method thereof
CN104021754B (en) A kind of image element circuit, organic EL display panel and display device
WO2017031909A1 (en) Pixel circuit and drive method thereof, array substrate, display panel, and display apparatus
CN104809989A (en) Pixel circuit, drive method thereof and related device
US9262966B2 (en) Pixel circuit, display panel and display apparatus
CN104167168B (en) Image element circuit and driving method thereof and display device
CN104240639A (en) Pixel circuit, organic electroluminescence display panel and display device
CN105427800A (en) Pixel circuit and driving method thereof, organic electroluminescent display panel, and display apparatus
CN102956185B (en) Pixel circuit and display device
CN103198788A (en) Pixel circuit, organic electroluminescence display panel and display device
WO2018161820A1 (en) Pixel driving circuit, driving method, organic light emitting display panel and display device
CN103021328B (en) Pixel circuit for driving light emitting device to emit light and display device
CN102881253B (en) A kind of image element circuit and thin film transistor backplane
CN203085137U (en) Pixel circuit, organic electroluminescence display panel and display device
CN203480803U (en) Pixel circuit, display panel, and display device
CN104575389A (en) Pixel circuit, driving method of pixel circuit, display panel and display device
CN204130142U (en) A kind of image element circuit, organic EL display panel and display device
CN102956199A (en) Pixel circuit and display device
CN202855266U (en) Pixel circuit and display device
CN202855264U (en) Pixel circuit and display device
US9019178B2 (en) Pixel unit driving circuit, pixel unit and display device
CN203895464U (en) Pixel circuit and display device

Legal Events

Date Code Title Description
GR01 Patent grant
C14 Grant of patent or utility model