CN104134427A - Pixel circuit - Google Patents
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- CN104134427A CN104134427A CN201410382652.6A CN201410382652A CN104134427A CN 104134427 A CN104134427 A CN 104134427A CN 201410382652 A CN201410382652 A CN 201410382652A CN 104134427 A CN104134427 A CN 104134427A
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Abstract
A pixel circuit comprises an energy storage element, a driving transistor, a first transistor, a second transistor, a third transistor, a fourth transistor and a fifth transistor. The first end of the first transistor is electrically connected with the first end of the energy storage element, the first end of the second transistor is used for selectively receiving a data voltage or a pre-charging voltage, and a grid electrode of the third transistor and a grid electrode of the second transistor are used for receiving a scanning signal. A grid electrode of the fifth transistor and a grid electrode of the fourth transistor are used for receiving a light-emitting enabled signal. According to the technical means, under the condition that the same data voltage is provided, and even if the critical voltage of the driving transistor shifts, the same driving current can still be generated to drive a light-emitting element. Therefore, the phenomenon of uneven brightness of a displayed picture can be avoided.
Description
Technical field
The invention relates to a kind of image element circuit, and particularly relevant for a kind of pixel-driving circuit that is applicable to Organic Light Emitting Diode.
Background technology
Flat display apparatus has that power consumption is low, thermal value is few and is lightweight ... etc. advantage, be widely used in various electronic products at present.Flat display apparatus, according to its type of drive, generally can be divided into passive matrix type (passive matrix) and two kinds of active matrixes (active matrix).Passive matrix type display device is limited to its drive pattern, have the life-span shorter with cannot large area ... etc. shortcoming.Although and active matrix display device cost comparatively costliness and processing procedure are comparatively complicated, can meet the demonstration demand of large scale and high-res.Therefore, active matrix display device has become the main flow of flat display apparatus.Wherein, active organic light-emitting diode (Organic Light-Emitting Diode, OLED) display device is one of product of Ge Jia manufacturer main development in recent years.
Yet, be applied to make in the thin film transistor (TFT) of active organic light-emitting diode display device, in order to drive the driving transistors possibility of Organic Light Emitting Diode because processing procedure, material or element characteristic are different ... etc. factor and cause transistorized critical voltage (threshold voltage) skew, make under identical data voltage drives, the drive current of the Organic Light Emitting Diode of each pixel has difference slightly.In addition, the flow through electric current of Organic Light Emitting Diode also can be supplied voltage and is subject to the impact of line resistance drop (IR-Drop) and changes along with power supply.Above-mentioned factor can cause the display frame of organic LED display device to have the phenomenon of brightness irregularities.
Summary of the invention
Therefore, an aspect of of the present present invention is that a kind of image element circuit is being provided.Described image element circuit comprises an energy-storage travelling wave tube, a driving transistors, a first transistor, a transistor seconds and one the 3rd transistor.The grid of driving transistors and the first end of energy-storage travelling wave tube are electrically connected.The first end of the first transistor and the first end of energy-storage travelling wave tube are electrically connected.The second end of the grid of the first transistor, the first transistor and the first end of driving transistors are electrically connected.The first end of transistor seconds is in order to optionally to receive a data voltage or a pre-charge pressure.The second end of the second end of transistor seconds and energy-storage travelling wave tube is electrically connected.The grid of the 3rd transistorized grid and transistor seconds is in order to receive one scan signal.The second end of the 3rd transistorized first end and driving transistors is electrically connected.The first end of the 3rd transistorized the second end and energy-storage travelling wave tube is electrically connected.In a first stage, the current potential of the second end of energy-storage travelling wave tube is maintained at a reference voltage.In a subordinate phase, the first end of transistor seconds is in order to receive pre-charge pressure.Transistor seconds and the 3rd transistor, according to sweep signal conducting, make energy-storage travelling wave tube charge via transistor seconds mat pre-charge pressure, and the first transistor is corresponding to the operation conducting of energy-storage travelling wave tube charging.
Another aspect of the present invention is that a kind of image element circuit is being provided.Described image element circuit comprises an energy-storage travelling wave tube, a driving transistors, a first transistor, a transistor seconds, one the 3rd transistor, one the 4th transistor and one the 5th transistor.The grid of driving transistors and the first end of energy-storage travelling wave tube are electrically connected.The first end of the first transistor and the first end of energy-storage travelling wave tube are electrically connected.The second end of the grid of the first transistor, the first transistor and the first end of driving transistors are electrically connected.The first end of transistor seconds is in order to optionally to receive a data voltage or a pre-charge pressure.The second end of the second end of transistor seconds and energy-storage travelling wave tube is electrically connected.The grid of the 3rd transistorized grid and transistor seconds is in order to receive one scan signal.The second end of the 3rd transistorized first end and driving transistors is electrically connected.The first end of the 3rd transistorized the second end and energy-storage travelling wave tube is electrically connected.The second end of the 4th transistorized first end and energy-storage travelling wave tube is electrically connected.The 4th transistorized the second end is electrically connected to a reference voltage.The second end of the 5th transistorized first end and driving transistors is electrically connected.The 5th transistorized grid and the 4th transistorized grid are in order to receive a luminous enable signal.
By technological means of the present invention, owing to driving, the critical voltage of the luminous drive current of light-emitting component and driving transistors is irrelevant, providing under the situation of identical data voltage, even if the critical voltage of driving transistors produces skew, still can by image element circuit proposed by the invention, produce identical drive current and drive light-emitting component.Thus, the driving transistors that can solve in image element circuit may be because processing procedure, material or element characteristic be different ... etc. factor and cause the problem of critical voltage skew, and can improve whereby the phenomenon of the display frame brightness irregularities of organic LED display device.
In addition, owing to driving the luminous drive current of light-emitting component and supply independent from voltage, can solve under different pixels, supply voltage because of line resistance drop (IR-Drop) and the inconsistent situation of the drive current causing.Thus, can effectively promote the picture homogeneous degree of the high-res panel that uses a large amount of pixels.
Moreover image element circuit proposed by the invention only needs to use two to drive signal, therefore can provide the more known larger pixel wiring space of pixel compensation circuit, and can improve the aperture opening ratio (aperture ratio) of display device.Thus, the demand of the panel of high-res and narrow frame (slim border) can be more prone to reach, and the life-span of light-emitting component can be further promoted.
Accompanying drawing explanation
Fig. 1 is in one embodiment of the invention, a kind of circuit diagram of image element circuit;
Fig. 2 A is according to one embodiment of the invention, drives the schematic diagram of image element circuit while being illustrated in a first stage;
Fig. 2 B is according to one embodiment of the invention, drives the signal schematic representation of image element circuit while being illustrated in a first stage;
Fig. 3 A is according to one embodiment of the invention, drives the schematic diagram of image element circuit while being illustrated in a subordinate phase;
Fig. 3 B is according to one embodiment of the invention, drives the signal schematic representation of image element circuit while being illustrated in a subordinate phase;
Fig. 4 A is according to one embodiment of the invention, drives the schematic diagram of image element circuit while being illustrated in a phase III;
Fig. 4 B is according to one embodiment of the invention, drives the signal schematic representation of image element circuit while being illustrated in a phase III;
Fig. 5 A is according to one embodiment of the invention, drives the schematic diagram of image element circuit while being illustrated in a fourth stage;
Fig. 5 B is according to one embodiment of the invention, drives the signal schematic representation of image element circuit while being illustrated in a fourth stage;
Fig. 6 is in one embodiment of the invention, a kind of circuit diagram of image element circuit;
Fig. 7 is in one embodiment of the invention, a kind of circuit diagram of image element circuit;
Fig. 8 is in one embodiment of the invention, a kind of circuit diagram of image element circuit.
Embodiment
Below to coordinate appended accompanying drawing to elaborate for embodiment, but the scope that the embodiment providing is not contained in order to limit the present invention, and the description of structure running is non-in order to limit the order of its execution, any structure being reconfigured by element, the device with impartial effect that produces, is all the scope that the present invention is contained.In addition, accompanying drawing only for the purpose of description, is not mapped according to life size.For making to be convenient to understand, in following explanation, similar elements illustrates the symbology with identical.
The word (terms) of using at full piece of writing instructions and claims, outside indicating especially, conventionally have each word use in this field, in the content of this exposure with special content in usual meaning.Some is in order to describe word of the present invention by lower or discuss in the other places of this instructions, so that those skilled in the art to be provided extra guiding in relevant description of the invention.
In addition, about " coupling " used herein or " connection ", all can refer to two or a plurality of element mutually directly make entity or in electrical contact, or mutually indirectly put into effect body or in electrical contact, also can refer to two or a plurality of element mutual operation or action.
In herein, unless in interior literary composition, for article, be particularly limited to some extent, " one " can make a general reference single one or more with " being somebody's turn to do ".What will be further understood that is, " comprising " used herein, " comprising ", " having " and similar vocabulary, indicate its feature of recording, region, integer, step, operation, element and/or assembly, but do not get rid of described in it or extra its one or more further features, region, integer, step, operation, element, assembly, and/or group wherein.
In addition, in this article, using the vocabulary of first, second and C grade etc., is to be understood for describing various elements, assembly, region, layer and/or block.But these elements, assembly, region, layer and/or block should not limited by these terms.These vocabulary are only limited to for distinguishing single element, assembly, region, layer and/or block.Therefore, one first element, assembly, region, layer and/or block hereinafter also can be called as the second element, assembly, region, layer and/or block, and do not depart from original idea of the present invention.
Please refer to Fig. 1.Fig. 1 is in one embodiment of the invention, a kind of circuit diagram of image element circuit 100.
Image element circuit 100 comprises an energy-storage travelling wave tube Cst, a driving transistors TD, a first transistor T1, a transistor seconds T2, one the 3rd transistor T 3, one the 4th transistor T 4 and one the 5th transistor T 5.
The grid of driving transistors TD and energy-storage travelling wave tube Cst are electrically connected.In an embodiment, energy-storage travelling wave tube Cst is an electric capacity, and the first end of the grid of driving transistors TD and energy-storage travelling wave tube Cst is electrically connected at end points E.The first end of the first end of the first transistor T1 and energy-storage travelling wave tube Cst is electrically connected at end points E, and the second end of the grid of the first transistor T1, the first transistor T1 and the first end of driving transistors TD are electrically connected at end points F, and receive a supply voltage OVDD from end points F.The first end of transistor seconds T2 is in order to optionally to receive a data voltage or a pre-charge pressure from terminal A.In an embodiment, the level of above-mentioned pre-charge pressure is higher than the level of above-mentioned data voltage, and above-mentioned data voltage can come from the output of a data drive circuit (not illustrating).The second end of transistor seconds T2 and the second end of energy-storage travelling wave tube Cst are electrically connected at end points D.The grid of the grid of the 3rd transistor T 3 and transistor seconds T2 is in order to receive one scan signal from terminal B.The second end of the first end of the 3rd transistor T 3 and driving transistors TD is electrically connected.The second end of the 3rd transistor T 3 and the first end of energy-storage travelling wave tube Cst are electrically connected at end points E.The second end of the first end of the 4th transistor T 4 and energy-storage travelling wave tube Cst is electrically connected at end points D.The second end of the 4th transistor T 4 is electrically connected to a reference voltage Vref.The second end of the first end of the 5th transistor T 5 and driving transistors TD is electrically connected.The grid of the grid of the 5th transistor T 5 and the 4th transistor T 4 is in order to receive a luminous enable signal from end points C.In the present embodiment, image element circuit 100 also comprises a light-emitting component 110.The second end of light-emitting component 110 and the 5th transistor T 5 is electrically connected.In an embodiment, light-emitting component 110 is an Organic Light Emitting Diode (Organic Light Emitting Diode, OLED), the second end of the anode of this Organic Light Emitting Diode and the 5th transistor T 5 is electrically connected, and the negative electrode of this Organic Light Emitting Diode is connected to a direct current (DC) bias OVSS.
In addition, in an embodiment, driving transistors TD, the first transistor T1, transistor seconds T2, the 3rd transistor T 3, the 4th transistor T 4 and the 5th transistor T 5 are all P transistor npn npn, and the source electrode (Source) that above-mentioned transistorized first end is P transistor npn npn, the drain electrode (Drain) that above-mentioned transistorized the second end is P transistor npn npn.
Following Fig. 2 A, Fig. 2 B, Fig. 3 A, Fig. 3 B, Fig. 4 A, Fig. 4 B, Fig. 5 A and Fig. 5 B are the operating process in order to pixels illustrated circuit 100.Fig. 2 A, Fig. 3 A, Fig. 4 A and Fig. 5 A are while being illustrated in different phase respectively, drive the schematic diagram of image element circuit 100.Fig. 2 B, Fig. 3 B, Fig. 4 B and Fig. 5 B are while illustrating respectively corresponding to stage shown in Fig. 2 A, Fig. 3 A, Fig. 4 A and Fig. 5 A, in order to drive the signal schematic representation of image element circuit 100.In Fig. 2 A, Fig. 3 A, Fig. 4 A and Fig. 5 A, terminal A is respectively in order to receive the signal 120 in Fig. 2 B, Fig. 3 B, Fig. 4 B, Fig. 5 B, terminal B is respectively in order to receive the sweep signal SCAN in Fig. 2 B, Fig. 3 B, Fig. 4 B, Fig. 5 B, and end points C is respectively in order to receive the luminous enable signal EM in Fig. 2 B, Fig. 3 B, Fig. 4 B, Fig. 5 B.And voltage Vg in Fig. 2 B, Fig. 3 B, Fig. 4 B, Fig. 5 B is respectively in Fig. 2 A, Fig. 3 A, Fig. 4 A and Fig. 5 A, the grid voltage of driving transistors TD.In addition, in Fig. 2 A, Fig. 3 A, Fig. 4 A and Fig. 5 A, the transistor of dotted portion means the not conducting of this transistor.
As shown in Figure 2A and 2B, before a first stage L1 who drives image element circuit 100 starts, the luminous enable signal EM that end points C receives is positioned at low level voltage.Therefore, the 4th transistor T 4 conductings, the current potential of the second end of energy-storage travelling wave tube Cst is that in end points, D is maintained at reference voltage Vref via the 4th transistor T 4.And when first stage L1, the luminous enable signal EM that end points C receives is high-level voltage by the transition of low level voltage.Therefore, the 4th transistor T 4 and the 5th transistor T 5 are closed according to luminous enable signal EM, and the current potential of the second end of energy-storage travelling wave tube Cst is still maintained at reference voltage Vref in end points D.In addition, the sweep signal SCAN receiving due to terminal B has a high-level voltage, so transistor seconds T2 and the 3rd not conducting of transistor T 3.And the signal 120 that terminal A receives is maintained at a pre-charge pressure Vpre.
Please refer to shown in Fig. 3 A and Fig. 3 B, when driving a subordinate phase L2 of image element circuit 100, the sweep signal SCAN that terminal B receives is low level voltage by high-level voltage transition.Transistor seconds T2 and the 3rd transistor T 3 are according to sweep signal SCAN conducting.Due to transistor seconds, T2 is switched on, and the pre-charge pressure Vpre that energy-storage travelling wave tube Cst has by terminal A via transistor seconds T2 charges.Wherein, the current potential of the second end of energy-storage travelling wave tube Cst (being the current potential of end points D) is charged to pre-charge pressure Vpre by reference voltage Vref.Due to the feedthrough effect (feed-through effect) of electric capacity, the current potential of the first end of energy-storage travelling wave tube Cst (being the current potential of end points E) also with rising.Therefore, transistor T 1 is switched on, and as shown in the dotted arrow direction in Fig. 3 A, energy-storage travelling wave tube Cst discharges via the first transistor T1.The potential value of the first end of energy-storage travelling wave tube Cst (being the potential value of end points E) will be discharged to about OVDD+|Vth|, and wherein Vth is the critical voltage (threshold voltage) of driving transistors TD.
Then, please refer to shown in Fig. 4 A and Fig. 4 B, when driving a phase III L3 of image element circuit 100, the signal 120 that terminal A receives drops to a data voltage Vdata by pre-charge pressure Vpre.Therefore, the current potential of the second end of energy-storage travelling wave tube Cst (being the current potential of end points D), by transistor seconds T2, is discharged to data voltage Vdata by pre-charge pressure Vpre.Due to the feedthrough effect of electric capacity, the current potential of the first end of energy-storage travelling wave tube Cst (being the current potential of end points E) also with decline.Therefore, transistor T 1 is closed, and because the grid potential of driving transistors TD drops to lower than OVDD-|Vth|, driving transistors TD conducting.As shown in the dotted arrow direction in Fig. 4 A, energy-storage travelling wave tube Cst is charged by supply voltage OVDD via seeing through driving transistors TD and the 3rd transistor T 3, makes the potential value (being the potential value of end points E) of the first end of energy-storage travelling wave tube Cst be charged to an operating voltage OVDD-|Vth|.
Please refer to shown in Fig. 5 A and Fig. 5 B, in driving a fourth stage L4 of image element circuit 100 when (showing the stage), the sweep signal SCAN that terminal B receives is high-level voltage by the transition of low level voltage, and the luminous enable signal EM that end points C receives is low level voltage by high-level voltage transition.Transistor seconds T2 and the 3rd transistor T 3 are closed according to sweep signal SCAN, and the 4th transistor T 4 and the 5th transistor T 5 are according to luminous enable signal EM conducting.The current potential of the second end of energy-storage travelling wave tube Cst (being the current potential of end points D) is by the 4th transistor T 4, and by data voltage, Vdata is discharged to reference voltage Vref.Due to the feedthrough effect of electric capacity, the current potential of the first end of energy-storage travelling wave tube Cst (being the current potential of end points E) also with drop to about OVDD-|Vth|-Vdata+Vref, therefore, driving transistors TD conducting.Due to driving transistors TD and the equal conducting of the 5th transistor T 5, make light-emitting component 110 be supplied via driving transistors TD and the 5th transistor T 5 that voltage OVDD drives and luminous.Wherein, the drive current Id that the second end that drives the luminous drive current of light-emitting component 110 to be driving transistors TD is exported.Drive current Id is determined by following mathematical expression:
Id＝K*(Vs-Vg-|Vth|)^2
＝K*(OVDD-(OVDD-|Vth|-Vdata+Vref)-|Vth|)^2
＝K*(Vdata-Vref)^2
Wherein, K is the current constant of driving transistors TD, and Vs is the current potential of the first end of driving transistors TD, and Vg is the current potential (being the current potential of end points E) of the grid of driving transistors TD.As shown from the above formula, the present invention is by utilizing the first end of transistor seconds T2 optionally to receive data voltage or pre-charge pressure from terminal A, and the feedthrough effect of utilizing electric capacity, make when showing the stage, drive the luminous drive current Id of light-emitting component 110 only relevant with data voltage Vdata and reference voltage Vref.The critical voltage Vth of drive current Id and driving transistors TD is irrelevant, and drive current Id is also irrelevant with supply voltage OVDD.
It should be noted that, the image element circuit 100 shown in above-mentioned Fig. 1 to Fig. 5 B is only an one exemplary embodiment of the present invention, and not with restriction the present invention.For example; although in image element circuit 100; each transistor all adopts P transistor npn npn to implement; but having, this area conventionally knows that the knowledgeable can follow the teaching content of above-mentioned one exemplary embodiment and analogizes/deduce and change the variant that adopts N-type transistor to implement; therefore without departing from the spirit and scope of the present invention, the embodiment of these modification also ought belong to the category of institute of the present invention wish protection.In addition, Fig. 6 to Fig. 8 is the variant that illustrates respectively image element circuit proposed by the invention.
In the image element circuit 600 shown in Fig. 6, end points I is in order to receive the signal 120 as shown in Fig. 2 B to Fig. 5 B, end points J is in order to receive the sweep signal SCAN as shown in Fig. 2 B to Fig. 5 B, and end points K is in order to receive the luminous enable signal EM as shown in Fig. 2 B to Fig. 5 B.Operation and the image element circuit shown in Fig. 1 to 5B 100 of image element circuit 600 are similar, therefore do not repeat them here.
In the image element circuit 700 shown in Fig. 7, end points L is in order to receive the signal 120 as shown in Fig. 2 B to Fig. 5 B, end points M is in order to receive the sweep signal SCAN as shown in Fig. 2 B to Fig. 5 B, and end points N is in order to receive the luminous enable signal EM as shown in Fig. 2 B to Fig. 5 B.Image element circuit 100 shown in the operation of image element circuit 700 and Fig. 1 to Fig. 5 B is similar, therefore do not repeat them here.
In the image element circuit 800 shown in Fig. 8, end points P is in order to receive the signal 120 as shown in Fig. 2 B to Fig. 5 B, end points Q is in order to receive the sweep signal SCAN as shown in Fig. 2 B to Fig. 5 B, and end points R is in order to receive the luminous enable signal EM as shown in Fig. 2 B to Fig. 5 B.Image element circuit 100 shown in the operation of image element circuit 800 and Fig. 1 to Fig. 5 B is similar, therefore do not repeat them here.
In sum, by technological means of the present invention, owing to driving, the critical voltage of the luminous drive current of light-emitting component and driving transistors is irrelevant, providing under the situation of identical data voltage, even if the critical voltage of driving transistors produces skew, still can by image element circuit proposed by the invention, produce identical drive current and drive light-emitting component.Thus, the driving transistors that can solve in image element circuit may be because processing procedure, material or element characteristic be different ... etc. factor and cause the problem of critical voltage skew, and can improve whereby the phenomenon of the display frame brightness irregularities of organic LED display device.
In addition, because the drive current that driving light-emitting component is luminous is irrelevant with supply voltage OVDD, can solve under different pixels, supply voltage because of line resistance drop (IR-Drop) and the inconsistent situation of the drive current causing.Thus, can effectively promote the picture homogeneous degree of the high-res panel that uses a large amount of pixels.
Moreover image element circuit proposed by the invention only needs to use two to drive signal, therefore can provide larger pixel wiring space, and can improve the aperture opening ratio (aperture ratio) of display device.Thus, the demand of the panel of high-res and narrow frame (slim border) can be more prone to reach, and the life-span of light-emitting component can be further promoted.
Although the present invention discloses as above with embodiment; so it is not in order to limit the present invention; anyly be familiar with this skill person; without departing from the spirit and scope of the present invention; when being used for a variety of modifications and variations, so the scope that protection scope of the present invention ought define depending on appending claims is as the criterion.
Claims (10)
1. an image element circuit, is characterized in that, comprises:
One energy-storage travelling wave tube;
One driving transistors, the grid of this driving transistors and the first end of this energy-storage travelling wave tube are electrically connected;
One the first transistor, the first end of this first transistor and the first end of this energy-storage travelling wave tube are electrically connected, and the second end of the grid of this first transistor, this first transistor and the first end of this driving transistors are electrically connected;
One transistor seconds, the first end of this transistor seconds is in order to optionally to receive a data voltage or a pre-charge pressure, and the second end of the second end of this transistor seconds and this energy-storage travelling wave tube is electrically connected; And
One the 3rd transistor, the grid of the 3rd transistorized grid and this transistor seconds is in order to receive one scan signal, the second end of the 3rd transistorized first end and this driving transistors is electrically connected, and the first end of the 3rd transistorized the second end and this energy-storage travelling wave tube is electrically connected;
Wherein, in a first stage, the current potential of the second end of this energy-storage travelling wave tube is maintained at a reference voltage;
In a subordinate phase, the first end of this transistor seconds is in order to receive this pre-charge pressure, this transistor seconds and the 3rd transistor are according to this sweep signal conducting, this energy-storage travelling wave tube is charged by this pre-charge pressure via this transistor seconds, and this first transistor is corresponding to the operation conducting of this energy-storage travelling wave tube charging.
2. image element circuit according to claim 1, is characterized in that, in a phase III, the first end of this transistor seconds is in order to receive this data voltage, and the second end of this energy-storage travelling wave tube is discharged to this data voltage via this transistor seconds.
3. image element circuit according to claim 2, it is characterized in that, in this phase III, this driving transistors conducting, and this energy-storage travelling wave tube more sees through this driving transistors and the 3rd transistor and is charged by a supply voltage, makes the first end of this energy-storage travelling wave tube be charged to an operating voltage.
4. image element circuit according to claim 1 and 2, is characterized in that, also comprises:
One the 4th transistor, the second end of the 4th transistorized first end and this energy-storage travelling wave tube is electrically connected, and the 4th transistorized the second end is electrically connected to this reference voltage; And
One the 5th transistor, the second end of the 5th transistorized first end and this driving transistors is electrically connected, the 5th transistorized grid and the 4th transistorized grid are in order to receive a luminous enable signal, and the 5th transistorized the second end is in order to be electrically connected a light-emitting component;
Wherein in a fourth stage, this transistor seconds and the 3rd transistor are closed according to this sweep signal, the 4th transistor and the 5th transistor are according to this luminous enable signal conducting, and the second end of this energy-storage travelling wave tube is discharged to this reference voltage via the 4th transistor.
5. image element circuit according to claim 4, is characterized in that, in this fourth stage, this driving transistors and the equal conducting of the 5th transistor, make this light-emitting component be driven by a supply voltage via this driving transistors and the 5th transistor and luminous.
6. according to the image element circuit described in any one in claim 1 to 5, it is characterized in that, the level of this pre-charge pressure is higher than the level of this data voltage.
7. an image element circuit, is characterized in that, comprises:
One energy-storage travelling wave tube;
One driving transistors, the grid of this driving transistors and the first end of this energy-storage travelling wave tube are electrically connected;
One the first transistor, the first end of this first transistor and the first end of this energy-storage travelling wave tube are electrically connected, and the second end of the grid of this first transistor, this first transistor and the first end of this driving transistors are electrically connected;
One transistor seconds, the first end of this transistor seconds is in order to optionally to receive a data voltage or a pre-charge pressure, and the second end of the second end of this transistor seconds and this energy-storage travelling wave tube is electrically connected;
One the 3rd transistor, the grid of the 3rd transistorized grid and this transistor seconds is in order to receive one scan signal, the second end of the 3rd transistorized first end and this driving transistors is electrically connected, and the first end of the 3rd transistorized the second end and this energy-storage travelling wave tube is electrically connected;
One the 4th transistor, the second end of the 4th transistorized first end and this energy-storage travelling wave tube is electrically connected, and the 4th transistorized the second end is electrically connected to a reference voltage; And
One the 5th transistor, the second end of the 5th transistorized first end and this driving transistors is electrically connected, and the 5th transistorized grid and the 4th transistorized grid are in order to receive a luminous enable signal.
8. image element circuit according to claim 7, is characterized in that, also comprises:
One light-emitting component, this light-emitting component and the 5th transistorized the second end are electrically connected.
9. image element circuit according to claim 8, it is characterized in that, this light-emitting component is an Organic Light Emitting Diode, and this driving transistors, this first transistor, this transistor seconds, the 3rd transistor, the 4th transistor and the 5th transistor are all P transistor npn npn.
10. according to the image element circuit described in any one in claim 7 to 9, it is characterized in that, the level of this pre-charge pressure is higher than the level of this data voltage.
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Cited By (7)
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| CN104318899A (en) * | 2014-11-17 | 2015-01-28 | 京东方科技集团股份有限公司 | Pixel unit driving circuit and method, pixel unit and display device |
| US9357603B2 (en) | 2014-09-01 | 2016-05-31 | Au Optronics Corp. | Driving method of light emitting diodes |
| CN105702198A (en) * | 2014-11-26 | 2016-06-22 | 业鑫科技顾问股份有限公司 | Pixel unit and driving method thereof |
| CN108154850A (en) * | 2017-11-28 | 2018-06-12 | 友达光电股份有限公司 | Pixel circuit |
| TWI665917B (en) * | 2016-12-20 | 2019-07-11 | 美商豪威科技股份有限公司 | Pixel circuit and imaging system |
| CN111540315A (en) * | 2020-02-21 | 2020-08-14 | 福州京东方光电科技有限公司 | Pixel driving circuit, driving method thereof and display device |
| CN113160752A (en) * | 2021-04-25 | 2021-07-23 | 南华大学 | Pixel circuit, driving method thereof and display device |
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