CN104021763A - Pixel circuit, display device and drive method of pixel circuit - Google Patents
Pixel circuit, display device and drive method of pixel circuit Download PDFInfo
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- CN104021763A CN104021763A CN201410261475.6A CN201410261475A CN104021763A CN 104021763 A CN104021763 A CN 104021763A CN 201410261475 A CN201410261475 A CN 201410261475A CN 104021763 A CN104021763 A CN 104021763A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The invention discloses a pixel circuit, a display device and a drive method of the pixel circuit and relates to the field of display. According to the pixel circuit, the display device and the drive method, the problem of driving tube threshold voltage drifting caused by long-time operation can be solved, influence on display by drive tube threshold voltage drifting is reduced, and the display effect of an AMOLED panel is improved. The pixel circuit comprises a light-emitting element, at least two drive circuits and a coupling unit used for guaranteeing that only one drive circuit drives the light-emitting element.
Description
Technical field
The present invention relates to demonstration field, relate in particular to the driving method of a kind of image element circuit, display device and image element circuit.
Background technology
Organic Light Emitting Diode (Organic Light Emitting Diode, OLED) be current drives active illuminant device, because it has autoluminescence, quick response, wide visual angle and can be produced on the first-class unique features of flexible substrate, be about to become the main flow in demonstration field taking OLED as basic organic light emitting display.
Each display unit of organic light emitting display, all formed by OLED, organic light emitting display can be divided into active organic light emitting display and passive organic light emitting display by type of drive, wherein active organic light emitting display refers to that each OLED is by thin film transistor (TFT) (Thin Film Transistor, TFT) circuit is controlled the electric current that flows through OLED, and OLED and the TFT circuit for driving OLED form image element circuit.
A kind of typical image element circuit as shown in Figure 1, comprise 2 TFT transistor M1 and M2,1 capacitor C and 1 OLED, wherein, the grid of TFT M2 is connected with scan signal line Vscan, and drain electrode is connected with data signal line Vdata, and source electrode is connected with the grid of TFT M1, the drain electrode of M1 is connected with the negative electrode of OLED, and source electrode is connected with low level Vss; The two ends of capacitor C are connected across respectively between the grid and source electrode of M1; The anode of OLED is connected with high level Vdd, and the TFT in Fig. 1 all adopts N-shaped TFT to describe as example.
The driving sequential chart of image element circuit described in what Fig. 2 provided is Fig. 1, as shown in Figure 2, the course of work of image element circuit is as follows: in the t1 time period, Vscan is in high level, therefore TFT M2 opens, and at this moment the high level of Vdata is written to the grid of memory capacitance C and TFT M1, and TFT M1 is opened, the negative electrode of OLED is connected with low level Vss, and OLED starts working luminous; In the t2 time period, Vscan is in low level, therefore TFT M2 turn-offs, now due to the electric charge maintenance effect of memory capacitance C, the grid of TFT M1 will continue to maintain high level state, makes TFT M1 continue to open, and OLED will work on, until below sometime the high level signal of Vscan arrive time, the luminance of OLED just may change.As from the foregoing, TFT M2 is controlling writing of data line voltage Vdata, and TFT M1 is the duty of controlling OLED, therefore TFT M2 is commonly referred to switching tube (Switch TFT), TFT M1 is called driving tube (Driver TFT), and capacitor C mainly plays voltage maintenance effect.
It is more than the course of work of general AMOLED image element circuit, there are the following problems for it: work long hours and can cause the threshold voltage of drive TFT M1 to drift about, and the luminosity of OLED and the threshold voltage of M1 are closely related, also the threshold voltage variation that is TFT M1 can affect the brightness homogeneity of OLED, and then affects the display effect of AMOLED panel.
Summary of the invention
Technical matters to be solved by this invention is to provide the driving method of a kind of image element circuit, display device and image element circuit, the driving tube threshold voltage shift problem that can solve works long hours causes, reduce the threshold voltage shift of driving tube to the impact showing, improve the display effect of display device.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of image element circuit, comprising: a light-emitting component; At least two group driving circuits; Coupling unit, takes turns to operate and drives described light-emitting component at least two group driving circuits described in guaranteeing.
Alternatively, described in every group, driving circuit at least comprises: for controlling the switching tube of data-signal input, and for the electric capacity of storage data signal, and for driving the driving tube of described light-emitting component.
Particularly, described driving circuit is two groups, is respectively the first driving circuit and the second driving circuit;
For described the first driving circuit, the control utmost point of its switching tube is connected to the first scan signal line, first utmost point of its switching tube is connected to data signal line, second utmost point of its switching tube is extremely connected with the control of its driving tube, first utmost point of its driving tube is extremely connected with second of described light-emitting component, second utmost point of its driving tube is connected with low level signal line, and the two ends of its electric capacity are connected in parallel on respectively between the control utmost point and second utmost point of its driving tube, and first utmost point of light-emitting component is connected with operating voltage signal wire; For described the second driving circuit, the control utmost point of its switching tube is connected to the second scan signal line, first utmost point of its switching tube is connected to data signal line, second utmost point of its switching tube is extremely connected with the control of its driving tube, first utmost point of its driving tube is extremely connected with second of described light-emitting component, second utmost point of its driving tube is connected with low level signal line, and the two ends of its electric capacity are connected in parallel on respectively between the control utmost point and second utmost point of its driving tube.
Alternatively, described coupling unit comprises:
The first film transistor, its control utmost point is connected to the control utmost point of driving tube in described the first driving circuit, and its second utmost point is connected with low level signal line, and its first utmost point is connected to the control utmost point of driving tube in described the second driving circuit,
The second thin film transistor (TFT), its control utmost point is connected to the control utmost point of driving tube in described the second driving circuit, and its second utmost point is connected with low level signal line, and its first utmost point is connected to the control utmost point of driving tube in described the first driving circuit.
Alternatively, described driving tube, described switching tube, described the first film transistor and described the second thin film transistor (TFT) are N-type thin film transistor (TFT).
Alternatively, described driving tube, described switching tube, described the first film transistor and described the second thin film transistor (TFT) are depletion type thin film transistor (TFT), or are reinforced membranes transistor.
Alternatively, described light-emitting component is Organic Light Emitting Diode, wherein, and first anode of Organic Light Emitting Diode very of described light-emitting component, second negative electrode of Organic Light Emitting Diode very of described light-emitting component.
The present invention also provides a kind of display device, and above-mentioned arbitrary image element circuit is set.
On the other hand, the present invention also provides a kind of driving method that is applicable to above-mentioned image element circuit, described image element circuit comprises: light-emitting component and at least two group driving circuits, described driving method is: described at least two group driving circuits take turns to operate and drive described light-emitting component.
Preferably, described at least two group driving circuits take turns to operate and drive described light-emitting component, specifically comprise:
In the very first time of N frame section, the first sweep signal is high level, the second sweep signal is low level, the switching tube of the first driving circuit is opened, the high level of data line signal line is written to node a, the control utmost point that described node a is driving tube in the first driving circuit, the capacitor charging of the first driving circuit and the driving tube of the first driving circuit are opened, light-emitting component starts luminous, now the switching tube of the second driving circuit turn-offs, the first film transistor in coupling unit is opened, the control utmost point of driving tube in the second driving circuit is connected with low level signal line, node b is that the driving tube of low level and the second driving circuit is in off state, the control utmost point that described node b is driving tube in the second driving circuit,
In the second time period of N frame, the first sweep signal and the second sweep signal are low level, therefore the switching tube in first, second driving circuit all turn-offs, due to the electric charge maintenance effect of electric capacity in the first driving circuit, node a is still maintained high level, and the first film transistor in coupling unit continues to open, and node b is still low level, the driving tube of the second driving circuit is still in off state, and light-emitting component keeps luminance;
In the very first time of N+1 frame section, the first sweep signal is low level, the second sweep signal is high level, the switching tube of the first driving circuit turn-offs, the switching tube of the second driving circuit is opened, the high level of data line signal line is written to node b, the capacitor charging of the second driving circuit and the driving tube of the second driving circuit are opened, light-emitting component starts luminous, now, the first film transistor in coupling unit turn-offs, the second thin film transistor (TFT) is opened, the control utmost point of driving tube in the first driving circuit is connected with low level signal line, node a becomes the driving tube of low level and the first driving circuit in off state,
In the second time period of N+1 frame, the first sweep signal and the second sweep signal are low level, therefore the switching tube of first, second driving circuit all turn-offs, and due to the electric charge maintenance effect of electric capacity in the second driving circuit, node b is still maintained high level, the second thin film transistor (TFT) in coupling unit continues to open, node a is still low level, and the driving tube of the first driving circuit is still in off state, and light-emitting component keeps luminance, wherein, N is non-zero natural number.
The driving method of image element circuit provided by the invention, display device and image element circuit, its image element circuit is provided with at least two group driving circuits, each group driving circuit driving light-emitting component that takes turns to operate when work, when each group of driving circuit is in off position time, the driving tube of corresponding driving circuit is in threshold voltage recovering state, thereby this kind of circuit design can effectively improve the threshold voltage shift problem that driving tube causes because working long hours, thereby improve the display effect of display device.
Brief description of the drawings
Fig. 1 is the structural representation of existing image element circuit;
Fig. 2 is the driving sequential chart of existing image element circuit;
Fig. 3 is the driving circuit schematic diagram in the embodiment of the present invention;
The image element circuit schematic diagram that Fig. 4 provides for the embodiment of the present invention;
Fig. 5 is the driving sequential chart of image element circuit shown in Fig. 4;
Fig. 6 is the driving method process flow diagram of image element circuit in the embodiment of the present invention.
Embodiment
The embodiment of the present invention provides the driving method of a kind of image element circuit, display device and image element circuit, the driving tube threshold voltage shift problem that can solve works long hours causes, reduce the threshold voltage shift of driving tube to the impact showing, improve the display effect of display device
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.Embodiment described herein only, in order to explain the present invention, is not intended to limit the present invention.
It should be noted that, for the transistor of field of liquid crystal display, drain electrode and source electrode do not have clear and definite difference, and the transistorized source electrode of therefore mentioning in the embodiment of the present invention can be transistorized drain electrode, and transistorized drain electrode can be also transistorized source electrode.
The embodiment of the present invention provides a kind of image element circuit, and this circuit comprises: comprising: light-emitting component; At least two group driving circuits; Coupling unit, takes turns to operate and drives described light-emitting component at least two group driving circuits described in guaranteeing.For the ease of this patent is further understood, existing by reference to the accompanying drawings and concrete embodiment this patent is carried out to detailed description.
Embodiment
The embodiment of the present invention provides a kind of image element circuit, and shown in Fig. 4, this circuit comprises: light-emitting component 14; At least two group driving circuits 11 and 12; Coupling unit 13, takes turns to operate and drives light-emitting component 14 at least two group driving circuits 11 and 12 described in guaranteeing.
The embodiment of the present invention proposes a kind of AMOLED pixel circuit design, this circuit adopts at least two group driving circuit designs, and make wherein one group in the time of driving condition, all the other groups are in off position, thereby make driving tube in the driving circuit of off position in threshold voltage recovering state, this kind of circuit design can effectively be improved the threshold voltage shift problem of driving tube and improve the display effect of AMOLED panel.
In prior art, use one-level pixel-driving circuit to drive, and the present embodiment adopts at least two parallel group driving circuits, wherein " driving circuit " described in the present embodiment, include but not limited to any pixel-driving circuit well-known to those skilled in the art, for example, described " driving circuit " can be the exemplary pixels driving circuit shown in Fig. 1, comprises 2 TFT transistor M1 and M2,1 capacitor C and 1 OLED; Also can be more complicated pixel-driving circuit, as can also be as shown in Figure 3 with the pixel-driving circuit of compensate function.Generally speaking, every group of driving circuit at least comprises: for controlling the switching tube of data-signal input, and for the electric capacity of storage data signal, and for driving the driving tube of light-emitting component.
Although the particular circuit configurations of driving circuit does not affect the concrete implementation result of the present embodiment, the present embodiment does not also limit the particular circuit configurations of driving circuit, but for ensureing the unification of display effect, the every one drive circuit in described " at least two group driving circuits " all should adopt identical circuit design.
It should be noted that, in driving circuit more than two, select in turn one group, make it in running order driving light-emitting component, when concrete enforcement, those skilled in the art are easy to expect multiple design proposal, accordingly, also there is multiple design in coupling unit, and light-emitting component, at least two group driving circuits, the concrete annexation of coupling unit depend on the specific design principle of coupling unit.
For the ease of the present embodiment is further understood, existing by reference to the accompanying drawings and concrete embodiment the embodiment of the present invention is carried out to detailed description.
As shown in Figure 4, particularly, image element circuit comprises two groups of driving circuits described in the embodiment of the present invention, is respectively the first driving circuit 11 and the second driving circuit 12, is typical 2T1C structure; For the first driving circuit 11, the control utmost point of its switch transistor T 3 is connected to the first scan signal line Vscan1, first utmost point of its switch transistor T 3 is connected to data signal line Vdata, second utmost point of its switch transistor T 3 is extremely connected with the control of its driving tube T4, first utmost point of its driving tube T4 is connected with the negative electrode of light-emitting component OLED, second utmost point of its driving tube T4 is connected with low level signal line Vss, and the two ends of its capacitor C 1 are connected in parallel on respectively between the control utmost point and second utmost point of its driving tube T4; For the second driving circuit 12, the control utmost point of its switch transistor T 5 is connected to the second scan signal line Vscan2, first utmost point of its switch transistor T 5 is connected to data signal line Vdata, second utmost point of its switch transistor T 5 is extremely connected with the control of its driving tube T6, first utmost point of its driving tube T6 is connected with the negative electrode of light-emitting component OLED, second utmost point of its driving tube T6 is connected with low level signal line Vss, and the two ends of its capacitor C 2 are connected in parallel on respectively between the control utmost point and second utmost point of its driving tube T6.Wherein, the anode input service voltage VDD of light-emitting component OLED.
Described coupling unit 13 comprises: the first film transistor T 1, its control utmost point is connected to the control utmost point of driving tube T4 in the first driving circuit 11, its second utmost point is connected with low level signal line Vss, and its first utmost point is connected to the control utmost point of driving tube T6 in the second driving circuit 12; The second thin film transistor (TFT) T2, its control utmost point is connected to the control utmost point of driving tube T6 in the second driving circuit 12, and its second utmost point is connected with low level signal line Vss, and its first utmost point is connected to the control utmost point of driving tube T4 in the first driving circuit 11.Light-emitting component 14 is Organic Light Emitting Diode (OLED).
Fig. 5 has provided the pixel driver sequential chart of corresponding diagram 4, is set forth in respectively now the course of work of following different time sections image element circuit.Describe respectively as example in the course of work of N frame and N+1 frame (N is as non-zero natural number) taking image element circuit below:
As shown in Figure 5, in the time of N frame above, when in the t1 time period, Vsca1 is high level, Vscan2 is low level, therefore TFT T3 opens, TFT T5 turn-offs, data line signal Vdata high level is written to node a by TFT T3, capacitor C 1 is charged, therefore drive TFT T4 opens, the negative electrode of OLED is connected with low level Vss, OLED starts working luminous, because the control utmost point of TFT T1 is connected with node a, therefore TFT T1 also opens, therefore its first utmost point is connected with low level Vss, also the control utmost point that is drive TFT T6 is connected with low level Vss, TFT T6 is in off state, also be that TFT T6 is in threshold voltage recovering state, in the t2 time period, now Vscan1 and Vscan2 are low level, therefore switching TFT T3 and T5 all turn-off, due to the electric charge maintenance effect of capacitor C 1, node a is still maintained high level, and TFT T1 continues to open, and node b is still low level, TFT T6 is in off state, and OLED duty keeps.At this moment TFT T2 is always in off state, and the two ends of capacitor C 2 are all in low level Vss.
In the time of N+1 frame below, when in the t3 time period, now Vscan1 is low level, Vscan2 is high level, therefore switching TFT T5 opens, TFT T3 turn-offs, data line signal Vdata high level is written to node b by TFT T5, and capacitor C 2 is charged, and therefore drive TFT T6 opens, OLED duty is adjusted into another luminance, because the control utmost point of TFT T3 shutoff and TFT T2 is connected with node b, therefore TFT T2 opens, and node a is connected with low level Vss, drive TFT T4 turn-offs, and is also that drive TFT T4 is in threshold voltage recovering state.Because the control utmost point of TFT T1 is connected with node a, therefore TFT T1 turn-offs, and the two ends of capacitor C 1 are all in low level Vss.
In N frame by above and N+1 frame time, the course of work of pixel driver is known, when one group of driving circuit wherein, such as TFT T3, T4 and capacitor C 1 and coupling TFT T1 are when in running order, one group of driving circuit in addition, such as TFT T5, T6 and capacitor C 2 and coupling TFT T2 are just in off position, and drive TFT T3 (T1) is wherein in threshold voltage recovering state, otherwise, as the same.
Shown in Fig. 4,6 thin film transistor (TFT)s (T1～T6) are N-type thin film transistor (TFT), for ease of manufacturing, preferably, adopt the N-type thin film transistor (TFT) of same size.Further, driving tube T4 and T6, switch transistor T 3 and T5, the first film transistor T 1 and the second thin film transistor (TFT) T2 are depletion type thin film transistor (TFT), or are reinforced membranes transistor.Wherein, alternatively, light-emitting component is Organic Light Emitting Diode (OLED).In embodiments of the present invention; the concrete model of described each thin film transistor (TFT) (is that each thin film transistor (TFT) is N-type or P type; depletion type or enhancement mode) can not be used for limiting image element circuit; for those of ordinary skill in the art; do not paying under the prerequisite of creative work; the type selecting of each thin film transistor (TFT) is changed and changed because type selecting changes the connection producing, also within protection scope of the present invention.
In above-mentioned, form the first driving circuit by TFT T3, T4 and capacitor C 1, form the second driving circuit by TFT T5, T6 and capacitor C 2, the first driving circuit and the second driving circuit alternation drive light-emitting component, the driving tube that wherein driving circuit in off position is corresponding is in threshold voltage recovering state, thereby this kind of circuit design can effectively improve the threshold voltage shift problem that driving tube causes because working long hours, thereby improve the display effect of display device.
First, second above-mentioned driving circuit is also replaceable for having the driving circuit of compensate function shown in Fig. 3.Drive sequential on Fig. 4 basis, to increase control signal PR and ER (it doesn't matter for control signal PR and ER and the present invention), its specific works process (limitting part related to the present invention) is roughly similar with narration above, is not described in detail in this.
In addition, although describe as an example of first, second two groups of driving circuits of walking abreast example in the present embodiment, but be understandable that, driving circuit be not limited to two groups, for example, described in the present embodiment in image element circuit, three groups of driving circuits can also be set, principle of work is substantially similar: a frame is divided into three periods, each period, by the on/off of switching tube in frame scan signal controlling first, second, and third driving circuit, realizes each choosing period of time and selects in turn one group of driving circuit to carry out work.Wherein when one group of drive circuit works, by coupling unit, the control utmost point of driving official in all the other group driving circuits is met to low level Vss, make it in threshold voltage recovering state.
The embodiment of the present invention also provides a kind of display device, and it is provided with any one above-mentioned image element circuit.Because described image element circuit is provided with at least two group driving circuits, each group driving circuit driving light-emitting component that takes turns to operate when work, when each group of driving circuit is in off position time, the driving tube of corresponding driving circuit is in threshold voltage recovering state, thereby this kind of circuit design can effectively be improved the threshold voltage shift problem that driving tube causes because working long hours, therefore display device brightness homogeneous described in the present embodiment, display effect is better.Described display device can be: any product or parts with Presentation Function such as Electronic Paper, oled panel, mobile phone, panel computer, televisor, display, notebook computer, digital album (digital photo frame), navigating instrument.
On the other hand, the present invention also provides a kind of driving method that is applicable to above-mentioned image element circuit, described image element circuit comprises: light-emitting component and at least two group driving circuits, described driving method is: described at least two group driving circuits take turns to operate and drive described light-emitting component.In the driving circuit of off position, its corresponding driving tube is in threshold voltage recovering state, thereby can effectively improve the threshold voltage shift problem that driving tube causes because working long hours, thereby improves the display effect of display device.
Particularly, for the image element circuit that is provided with two groups of driving circuits shown in Fig. 4, driving circuit provided by the invention takes turns to operate and drives the driving method of light-emitting component, specifically as shown in Figure 6, comprising:
101, in the very first time of N frame section, the first sweep signal Vscan1 is high level, the second sweep signal Vscan2 is low level, the switch transistor T 3 of the first driving circuit is opened, the high level of data line signal line Vdata is written to node a, the control utmost point that described node a is driving tube T4 in the first driving circuit, the capacitor C 1 of the first driving circuit is charged and the driving tube T4 of the first driving circuit opens, light-emitting component OLED starts luminous, now the switch transistor T 5 of the second driving circuit is turn-offed, the first film transistor T 1 in coupling unit is opened, the control utmost point of driving tube T6 in the second driving circuit is connected with low level signal line Vss, node b is that the driving tube T6 of low level and the second driving circuit is in off state, the control utmost point that described node b is driving tube T6 in the second driving circuit.
102, in the second time period of N frame, the first sweep signal Vscan1 and the second sweep signal Vscan2 are low level, therefore switch transistor T 3, the T5 in first, second driving circuit all turn-offs, due to the electric charge maintenance effect of capacitor C 1 in the first driving circuit, node a is still maintained high level, and the first film transistor T 1 in coupling unit continues to open, and node b is still low level, the driving tube T6 of the second driving circuit is still in off state, and light-emitting component OLED keeps luminance;
103, in the very first time of N+1 frame section, the first sweep signal Vscan1 is low level, the second sweep signal Vscan2 is high level, the switch transistor T 3 of the first driving circuit is turn-offed, the switch transistor T 5 of the second driving circuit is opened, the high level of data line signal line Vdata is written to node b, the capacitor C 2 of the second driving circuit is charged and the driving tube T6 of the second driving circuit opens, light-emitting component OLED starts luminous, now, the first film transistor T 1 in coupling unit turn-offs, the second thin film transistor (TFT) T2 opens, the control utmost point of driving tube T4 in the first driving circuit is connected with low level signal line, node a becomes the driving tube T4 of low level and the first driving circuit in off state,
104, in the second time period of N+1 frame, the first sweep signal Vscan1 and the second sweep signal Vscan2 are low level, therefore switch transistor T 3, the T5 of first, second driving circuit all turn-off, due to the electric charge maintenance effect of capacitor C 2 in the second driving circuit, node b is still maintained high level, the second thin film transistor (TFT) T2 in coupling unit continues to open, node a is still low level, the driving tube T4 of the first driving circuit is still in off state, light-emitting component OLED keeps luminance, wherein, N is non-zero natural number.
The driving method of image element circuit provided by the invention, be applicable to be provided with the image element circuit of at least two group driving circuits, when work, make the each group of driving circuit driving light-emitting component that takes turns to operate, the wherein driving circuit in off position, its driving tube is in threshold voltage recovering state, thereby this kind of circuit design can effectively improve the threshold voltage shift problem that driving tube causes because working long hours, thereby improve the display effect of display device.
Technical characterictic described in the embodiment of the present invention, in the situation that not conflicting, can be used in combination arbitrarily mutually.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection domain of claim.
Claims (10)
1. an image element circuit, is characterized in that, comprising:
A light-emitting component;
At least two group driving circuits;
Coupling unit, takes turns to operate and drives described light-emitting component at least two group driving circuits described in guaranteeing.
2. image element circuit according to claim 1, is characterized in that,
Described in every group, driving circuit at least comprises: for controlling the switching tube of data-signal input, and for the electric capacity of storage data signal, and for driving the driving tube of described light-emitting component.
3. image element circuit according to claim 2, is characterized in that, described driving circuit is two groups, is respectively the first driving circuit and the second driving circuit;
For described the first driving circuit, the control utmost point of its switching tube is connected to the first scan signal line, first utmost point of its switching tube is connected to data signal line, second utmost point of its switching tube is extremely connected with the control of its driving tube, first utmost point of its driving tube is extremely connected with second of described light-emitting component, second utmost point of its driving tube is connected with low level signal line, and the two ends of its electric capacity are connected in parallel on respectively between the control utmost point and second utmost point of its driving tube, and first utmost point of light-emitting component is connected with operating voltage signal wire;
For described the second driving circuit, the control utmost point of its switching tube is connected to the second scan signal line, first utmost point of its switching tube is connected to data signal line, second utmost point of its switching tube is extremely connected with the control of its driving tube, first utmost point of its driving tube is extremely connected with second of described light-emitting component, second utmost point of its driving tube is connected with low level signal line, and the two ends of its electric capacity are connected in parallel on respectively between the control utmost point and second utmost point of its driving tube.
4. image element circuit according to claim 3, is characterized in that, described coupling unit comprises:
The first film transistor, its control utmost point is connected to the control utmost point of driving tube in described the first driving circuit, and its second utmost point is connected with low level signal line, and its first utmost point is connected to the control utmost point of driving tube in described the second driving circuit,
The second thin film transistor (TFT), its control utmost point is connected to the control utmost point of driving tube in described the second driving circuit, and its second utmost point is connected with low level signal line, and its first utmost point is connected to the control utmost point of driving tube in described the first driving circuit.
5. image element circuit according to claim 4, is characterized in that,
Described driving tube, described switching tube, described the first film transistor and described the second thin film transistor (TFT) are N-type thin film transistor (TFT).
6. image element circuit according to claim 4, is characterized in that,
Described driving tube, described switching tube, described the first film transistor and described the second thin film transistor (TFT) are depletion type thin film transistor (TFT), or are reinforced membranes transistor.
7. image element circuit according to claim 1, is characterized in that,
Described light-emitting component is Organic Light Emitting Diode, wherein, and first anode of Organic Light Emitting Diode very of described light-emitting component, second negative electrode of Organic Light Emitting Diode very of described light-emitting component.
8. a display device, is characterized in that, is provided with the image element circuit described in claim 1-7 any one.
9. a driving method for image element circuit, is characterized in that, described image element circuit comprises: light-emitting component and at least two group driving circuits, and described driving method is:
Described at least two group driving circuits take turns to operate and drive described light-emitting component.
10. driving method according to claim 9, is characterized in that, described at least two group driving circuits take turns to operate and drive described light-emitting component, specifically comprise:
In the very first time of N frame section, the first sweep signal is high level, the second sweep signal is low level, the switching tube of the first driving circuit is opened, the high level of data line signal line is written to node a, the control utmost point that described node a is driving tube in the first driving circuit, the capacitor charging of the first driving circuit and the driving tube of the first driving circuit are opened, light-emitting component starts luminous, now the switching tube of the second driving circuit turn-offs, the first film transistor in coupling unit is opened, the control utmost point of driving tube in the second driving circuit is connected with low level signal line, node b is that the driving tube of low level and the second driving circuit is in off state, the control utmost point that described node b is driving tube in the second driving circuit,
In the second time period of N frame, the first sweep signal and the second sweep signal are low level, therefore the switching tube in first, second driving circuit all turn-offs, due to the electric charge maintenance effect of electric capacity in the first driving circuit, node a is still maintained high level, and the first film transistor in coupling unit continues to open, and node b is still low level, the driving tube of the second driving circuit is still in off state, and light-emitting component keeps luminance;
In the very first time of N+1 frame section, the first sweep signal is low level, the second sweep signal is high level, the switching tube of the first driving circuit turn-offs, the switching tube of the second driving circuit is opened, the high level of data line signal line is written to node b, the capacitor charging of the second driving circuit and the driving tube of the second driving circuit are opened, light-emitting component starts luminous, now, the first film transistor in coupling unit turn-offs, the second thin film transistor (TFT) is opened, the control utmost point of driving tube in the first driving circuit is connected with low level signal line, node a becomes the driving tube of low level and the first driving circuit in off state,
In the second time period of N+1 frame, the first sweep signal and the second sweep signal are low level, therefore the switching tube of first, second driving circuit all turn-offs, and due to the electric charge maintenance effect of electric capacity in the second driving circuit, node b is still maintained high level, the second thin film transistor (TFT) in coupling unit continues to open, node a is still low level, and the driving tube of the first driving circuit is still in off state, and light-emitting component keeps luminance, wherein, N is non-zero natural number.
Priority Applications (2)
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| CN201410261475.6A CN104021763B (en) | 2014-06-11 | 2014-06-11 | The driving method of image element circuit, display device and image element circuit |
| PCT/CN2014/085833 WO2015188471A1 (en) | 2014-06-11 | 2014-09-03 | Pixel circuit, display device and method for driving pixel circuit |
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| CN201410261475.6A CN104021763B (en) | 2014-06-11 | 2014-06-11 | The driving method of image element circuit, display device and image element circuit |
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| WO2015188471A1 (en) | 2015-12-17 |
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