CN104464624A - Pixel compensating circuit of active matrix organic light emitting diode displayer - Google Patents
Pixel compensating circuit of active matrix organic light emitting diode displayer Download PDFInfo
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Abstract
The invention provides a pixel compensating circuit of an active matrix organic light emitting diode displayer. The pixel compensating circuit comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a memory capacitor and an organic light emitting diode, wherein the control end of the first switch receives a light emitting pulse signal, the first end of the first switch is electrically coupled with reference voltage, the control end of the second switch receives a second scanning signal, the second end of the second switch is electrically coupled with data voltage, the control end of the third switch receives a first scanning signal, the first end of the fourth switch is electrically coupled with first voltage, the control end of the fifth switch receives the second scanning signal, the control end of the sixth switch receives the light emitting pulse signal, and the memory capacitor is connected between the first end and the second end of the third switch in a crossover mode. Compared with the prior art, the pixel compensating circuit has the advantages that a compensation operation is carried out before the lightening period, the voltage potential of the control end of the fourth switch is increased from the data voltage to the difference value between the first voltage and threshold voltage, a light emitting current is not influenced by threshold voltage shift, stable current output is maintained, and nonuniform luminance of display pictures is improved.
Description
Technical field
The present invention relates to a kind of active-matrix organic light emitting diode display, particularly relate to the pixel compensation circuit of this active-matrix organic light emitting diode display.
Background technology
In recent years, conventional display gradually replace by portable flat displays.Because organic or inorganic active display can provide wide viewing angle and good contrast, and have response speed fast, thus the display of these emissive types of organic or inorganic active display has more advantage than other flat-panel monitor.Like this, organic or inorganic active display has caused the extensive concern of people as display of future generation, particularly comprise Organic Light Emitting Diode (the Organic Light Emitting Diode being defined luminescent layer by organic material, OLED) display is while providing coloured image, compares inorganic light emitting displays and has higher brightness, lower driving voltage and response time faster.
In general, OLED display can be divided into passive-matrix to drive (PassiveMatrix OLED, PMOLED) and active matrix drive (Active Matrix OLED, AMOLED) two kinds according to type of drive.Wherein, PMOLED display is not luminous when data do not write, only luminous in data address period.This type of drive structure is simple, cost is lower, be easier to design, is mainly applicable to the display of small-medium size.For displayer, each pixel of this pel array has capacitance stores data, allows each pixel all maintain luminance.Power consumption due to displayer is significantly less than PMOLED display, adds that type of drive is more suitable for developing the display of large scale and high-res, makes displayer become the Main way of future development.
But when AMOLED panel will develop toward high resolving power, fabric swatch (Layout) area will become a problem not.In particular, if the same node (Node) in compensating circuit must be electrically connected to more than three thin film transistor (TFT)s, and different thin film transistor (TFT)s has again and easily to cause fabric swatch difficulty during respective grid control signal.In addition, due to the impact of processing procedure, the threshold voltage of the thin film transistor (TFT) in each pixel there will be drift in various degree, even if provide identical drive voltage signal, the glow current flowing through Organic Light Emitting Diode is also probably different, and then causes the brightness irregularities of display frame.
In view of this, how designing a kind of pixel compensation circuit for displayer, to eliminate above-mentioned many defects of the prior art, is the problem that person skilled is urgently to be resolved hurrily in the industry.
Summary of the invention
For the defect of the brightness irregularities that the pixel compensation circuit of active-matrix organic light emitting diode display of the prior art exists when display frame, the invention provides a kind of pixel compensation circuit of active-matrix organic light emitting diode display.
According to one aspect of the present invention, provide the pixel compensation circuit of a kind of active-matrix Organic Light Emitting Diode (ActiveMatrix Organic Light Emitting Diode, AMOLED) display, comprising:
One first switch, has a first end, one second end and a control end, and the control end of described first switch is in order to receive a LED pulse signal, and the first end of described first switch is electrically coupled to a reference voltage;
One second switch, there is a first end, one second end and a control end, the control end of described second switch is in order to receive one second sweep signal, the first end of described second switch is electrically coupled to the second end of described first switch, and the second end of described second switch is electrically coupled to a data voltage;
One the 3rd switch, there is a first end, one second end and a control end, the control end of described 3rd switch is in order to receive one first sweep signal, and the second end of described 3rd switch is electrically coupled to the second end of described first switch and the first end of described second switch;
One the 4th switch, has a first end, one second end and a control end, and the control end of described 4th switch is electrically coupled to the first end of described 3rd switch, and the first end of described 4th switch is electrically coupled to one first voltage;
One the 5th switch, there is a first end, one second end and a control end, the control end of described 5th switch is in order to receive described second sweep signal, the first end of the 3rd switch described in the first end electric property coupling of described 5th switch and the control end of described 4th switch, the second end of the 4th switch described in the second end electric property coupling of described 5th switch;
One the 6th switch, has a first end, one second end and a control end, and the control end of described 6th switch is in order to receive described LED pulse signal, and the second end of described 6th switch is electrically coupled to the second end of described 4th switch;
One memory capacitance, has a first end and one second end, and the first end of described memory capacitance is electrically coupled to the second end of described first switch, and the second end of described memory capacitance is electrically coupled to the first end of described 3rd switch; And
One Organic Light Emitting Diode (OLED, Organic Light Emitting Diode), its anode is electrically coupled to the first end of described 6th switch, and its negative electrode is electrically coupled to one second voltage, and described second voltage is less than described first voltage.
An embodiment wherein, described first switch to described 6th switch is a P-type TFT.
An embodiment wherein, the threshold voltage of the glow current and thin film transistor (TFT) that flow through this Organic Light Emitting Diode has nothing to do.
An embodiment wherein, the combination of described first sweep signal, described second sweep signal and described LED pulse signal is corresponding in turn in a charging reseting period, a data write and between the amortization period and light period.
An embodiment wherein, in described charging reseting period, described first sweep signal is a low level signal, and described second sweep signal is a high level signal, and described LED pulse signal is a high level signal.
An embodiment wherein, described first switch, described second switch, described 5th switch and described 6th switch are all in off state, and described 3rd switch and described 4th switch are all in opening state.
An embodiment wherein, in described data write with between the amortization period, described first sweep signal is a high level signal, and described second sweep signal is a low level signal, and described LED pulse signal is a high level signal.
An embodiment wherein, described first switch and described 6th switch are all in off state, and described second switch, described 3rd switch, described 4th switch and described 5th switch are all in opening state.
An embodiment wherein, light period described, described first sweep signal is a high level signal, and described second sweep signal is a high level signal, and described LED pulse signal is a low level signal.
An embodiment wherein, described first switch, described 4th switch and described 6th switch are all in opening state, and described second switch, described 3rd switch and described 5th switch are all in off state.
Adopt pixel compensation circuit of the present invention, the control end of the first switch is received a LED pulse signal, the control end of second switch receives one second sweep signal, the control end of the 3rd switch receives one first sweep signal, the control end of the 4th switch is electrically coupled to the first end of the 3rd switch, the control end of the 5th switch receives the second sweep signal, the control end of the 6th switch receives LED pulse signal, between the first end that memory capacitance is connected across the 3rd switch and the second end, the anode of Organic Light Emitting Diode is electrically coupled to the first end of the 6th switch and negative electrode is electrically coupled to one second voltage.Compared to prior art, pixel compensation circuit of the present invention compensated operation before lighting period, the voltage potential of the control end of the second end of memory capacitance that is the 4th switch is raised to voltage difference between the first voltage and the threshold voltage of thin film transistor (TFT) from data voltage, make the glow current flowing through Organic Light Emitting Diode not by the impact of thin film transistor (TFT) threshold voltage shift, thus maintain stable electric current output, improve the brightness irregularities situation of display frame.
Accompanying drawing explanation
Reader, after having read the specific embodiment of the present invention with reference to accompanying drawing, will become apparent various aspects of the present invention.Wherein,
Fig. 1 illustrates the structural representation of the pixel compensation circuit of a kind of active-matrix organic light emitting diode display of the prior art;
Fig. 2 A illustrates that the pixel compensation circuit working of the active-matrix organic light emitting diode display of foundation an embodiment of the present invention is in the view of reseting period;
Fig. 2 B illustrates the timing waveform of key signal at reseting period of the pixel compensation circuit of Fig. 2 A;
Fig. 3 A illustrates that the pixel compensation circuit working of Fig. 2 A is in data write and the view between the amortization period;
Fig. 3 B illustrates that the key signal of the pixel compensation circuit of Fig. 2 A is at data write and the timing waveform between the amortization period;
Fig. 4 A illustrates that the pixel compensation circuit working of Fig. 2 A is in the view lighting period; And
Fig. 4 B illustrates that the key signal of the pixel compensation circuit of Fig. 2 A is at the timing waveform lighting period.
Embodiment
The technology contents disclosed to make the application is more detailed and complete, and can refer to accompanying drawing and following various specific embodiment of the present invention, mark identical in accompanying drawing represents same or analogous assembly.But those of ordinary skill in the art should be appreciated that hereinafter provided embodiment is not used for limiting the scope that contains of the present invention.In addition, accompanying drawing, only for being schematically illustrated, is not drawn according to its life size.
As mentioned before, because the processing procedure of thin film transistor (TFT) affects, its threshold voltage there will be drift in various degree, even if provide identical drive voltage signal, the glow current flowing through Organic Light Emitting Diode is also probably different, and this often causes the brightness irregularities of display frame.This is because when thin film transistor (TFT) and Organic Light Emitting Diode are connected in series, its glow current meets following relationship:
Wherein, I is the glow current flowing through Organic Light Emitting Diode, and β is coefficient, V
sgfor the source-gate voltage (or being called driving voltage) of thin film transistor (TFT), V
thfor the threshold voltage of thin film transistor (TFT).From the above, V is worked as
sgtime identical, due to threshold voltage V
thdrift phenomenon, its glow current is still different.
Fig. 1 illustrates the structural representation of the pixel compensation circuit of a kind of active-matrix organic light emitting diode display of the prior art.In order to solve the threshold voltage shift puzzlement of thin film transistor (TFT), as shown in Figure 1, it comprises six switch transistor T 1 ~ T6 and electric capacity C to existing a kind of pixel compensation circuit, that is, " 6T1C " framework.
With regard to circuit connecting relation, the control end of the first switch transistor T 1 receives one first sweep signal S1, and the first end of the first switch transistor T 1 is electrically coupled to a reference voltage Vref, and the second end of the first switch transistor T 1 is electrically coupled to common node A.The control end of second switch pipe T2 receives a LED pulse signal EM, and the first end of the first end electric property coupling electric capacity C of second switch pipe T2, second end of second switch pipe T2 is electrically coupled to above-mentioned reference voltage Vref.The control end of the 3rd switch transistor T 3 receives one second sweep signal S2, and the first end of the 3rd switch transistor T 3 is electrically coupled to second end of electric capacity C, and the second end of the 3rd switch transistor T 3 is electrically coupled to common node A.
The control end of the 4th switch transistor T 4 is electrically coupled to second end of electric capacity C, and the first end of the 4th switch transistor T 4 is electrically coupled to one first voltage OVDD, and the second end of the 4th switch transistor T 4 is electrically coupled to common node A.The control end of the 5th switch transistor T 5 receives a LED pulse signal EM, and the first end of the 5th switch transistor T 5 is electrically coupled to the anode of Organic Light Emitting Diode OLED, and the second end of the 5th switch transistor T 5 is electrically coupled to above-mentioned common node A.The control end of the 6th switch transistor T 6 receives the second sweep signal S2, and the first end of the 6th switch transistor T 6 is in order to receive a luma data voltage signal DATA, and the second end of the 3rd switch transistor T 6 is electrically coupled to the first end of electric capacity C.
Although foregoing circuit can allow Organic Light Emitting Diode OLED have nothing to do at the threshold voltage of the glow current and switching tube of lighting period, the problem on circuit fabric swatch (layout) also can be brought.In the compensating circuit of Fig. 1, node A is electrically connected to switch transistor T 1, T3, T4 and T5 simultaneously, these four switching tubes grid control signal is separately all not identical, generally need to offer 4 via holes (via hole) and two strip metal connecting lines could realize the connection line relevant to node A, this can affect the cloth board space of circuit undoubtedly, adds the difficulty of panel height analytical design method.
In order to solve the above-mentioned defect of the existing compensating circuit of Fig. 1, the invention provides a kind of new pixel compensation circuit.Fig. 2 A illustrates that the pixel compensation circuit working of the active-matrix organic light emitting diode display of foundation an embodiment of the present invention is in the view of reseting period.Fig. 2 B illustrates the timing waveform of key signal at reseting period of the pixel compensation circuit of Fig. 2 A.
With reference to Fig. 2 A, pixel compensation circuit of the present invention also adopts 6T1C framework, and it comprises the first switch M1, second switch M2, the 3rd switch M3, the 4th switch M4, the 5th switch M5, the 6th switch M6 and memory capacitance C1.Such as, the first switch M1 is a P-type TFT to the 6th switch M6, when grid applies low level voltage, and switch conduction; When grid applies high level voltage, switch ends.
Specifically, the grid of the first switch M1 is in order to receive a LED pulse signal EM, and the drain electrode of the first switch M1 (or source electrode, lower with) is electrically coupled to a reference voltage Vref.The source electrode of the first switch M1 (or drain electrode, lower with) is electrically coupled to node N1.The grid of second switch M2 is in order to receive one second sweep signal S2, and the drain electrode of second switch M2 is electrically coupled to the source electrode of the first switch M1, and the source electrode of second switch M2 is electrically coupled to a data voltage Vdata.
The grid of the 3rd switch M3 is in order to receive one first sweep signal S1, and the source electrode of the 3rd switch M3 is electrically coupled to the source electrode of the first switch M1 and the drain electrode of second switch M2 to form node N1.The drain electrode of the 3rd switch M3 is electrically coupled to node N2.The grid of the 4th switch M4 is electrically coupled to the drain electrode of the 3rd switch M3, and the drain electrode of the 4th switch M4 is electrically coupled to one first voltage OVDD, and the source electrode of the 4th switch M4 is electrically coupled to the source electrode of the 6th switch M6.
The grid of the 5th switch M5 in order to receive the second sweep signal S2, the drain electrode of drain electrode electric property coupling the 3rd switch M3 of the 5th switch M5 and the grid of the 4th switch M4 to form above-mentioned node N2, the source electrode of source electrode electric property coupling the 4th switch M4 of the 5th switch M5.The grid of the 6th switch M6 is in order to receive LED pulse signal EM, and the source electrode of the 6th switch M6 is electrically coupled to the source electrode of the 4th switch M4, and the drain electrode of the 6th switch M6 is electrically coupled to Organic Light Emitting Diode OLED.
Between the drain electrode that memory capacitance C1 is connected across the 3rd switch M3 and source electrode, such as, the first end of memory capacitance C1 and the source electrode of the 3rd switch M3 are connected to node N1, and second end of memory capacitance C1 and the drain electrode of the 3rd switch M3 are connected to node N2.The anode of Organic Light Emitting Diode OLED is electrically coupled to the drain electrode of the 6th switch M6, and its negative electrode is electrically coupled to one second voltage OVSS, and the second voltage OVSS is less than the first voltage OVDD.
As shown in Figure 2 B, when this circuit working is when charging reset (charge reset) period t1, the first sweep signal S1 is low level signal, and the second sweep signal S2 is high level signal, and LED pulse signal EM is high level signal.Accordingly, the first switch M1, second switch M2, the 5th switch M5 and the 6th switch M6 are all in off state, and the 3rd switch M3 and the 4th switch M4 is all in opening state.Now, the voltage of node N1 is 0, and the voltage of node N2 is also 0.
Fig. 3 A illustrates that the pixel compensation circuit working of Fig. 2 A is in data write and the view between the amortization period.Fig. 3 B illustrates that the key signal of the pixel compensation circuit of Fig. 2 A is at data write and the timing waveform between the amortization period.
With reference to Fig. 3 A and Fig. 3 B, after charging reseting period terminates, pixel compensation circuit working is in data write and compensate (data writing & compensation) period t2.Now, the first sweep signal S1 is high level signal, and the second sweep signal S2 is low level signal, and LED pulse signal EM is high level signal.Accordingly, the first switch M1 and the 6th switch M6 is all in off state, and second switch M2, the 3rd switch M3, the 4th switch M4 and the 5th switch M5 are all in opening state.Now, the voltage of node N1 is Vdata, and the voltage of node N2 charges to OVDD-Vth from Vdata.
Fig. 4 A illustrates that the pixel compensation circuit working of Fig. 2 A is in the view lighting period.Fig. 4 B illustrates that the key signal of the pixel compensation circuit of Fig. 2 A is at the timing waveform lighting period.
With reference to Fig. 4 A and Fig. 4 B, in data write with after terminating between the amortization period, pixel compensation circuit working is lighting period t3.Now, the first sweep signal S1 is high level signal, and the second sweep signal S2 is high level signal, and LED pulse signal EM is low level signal.Accordingly, the first switch M1, the 4th switch M4 and the 6th switch M6 are all in opening state, and second switch M2, the 3rd switch M3 and the 5th switch M5 are all in off state.Now, the voltage of node N1 is Vref, and the voltage of node N2 is then (OVDD-Vth-Vdata+Vref).Thus, form a current return from the first voltage OVDD, switch M4, switch M6, Organic Light Emitting Diode OLED and the second voltage OVSS, the glow current flowing through Organic Light Emitting Diode OLED can adopt above-mentioned formula to be expressed as:
Can obtain after conversion,
That is, the threshold voltage of the glow current and thin film transistor (TFT) that flow through this Organic Light Emitting Diode has nothing to do.
Adopt pixel compensation circuit of the present invention, the control end of the first switch is received a LED pulse signal, the control end of second switch receives one second sweep signal, the control end of the 3rd switch receives one first sweep signal, the control end of the 4th switch is electrically coupled to the first end of the 3rd switch, the control end of the 5th switch receives the second sweep signal, the control end of the 6th switch receives LED pulse signal, between the first end that memory capacitance is connected across the 3rd switch and the second end, the anode of Organic Light Emitting Diode is electrically coupled to the first end of the 6th switch and negative electrode is electrically coupled to one second voltage.Compared to prior art, pixel compensation circuit of the present invention compensated operation before lighting period, the voltage potential of the control end of the second end of memory capacitance that is the 4th switch is raised to voltage difference between the first voltage and the threshold voltage of thin film transistor (TFT) from data voltage, make the glow current flowing through Organic Light Emitting Diode not by the impact of thin film transistor (TFT) threshold voltage shift, thus maintain stable electric current output, improve the brightness irregularities situation of display frame.
Above, the specific embodiment of the present invention is described with reference to the accompanying drawings.But those skilled in the art can understand, when without departing from the spirit and scope of the present invention, various change and replacement can also be done to the specific embodiment of the present invention.These change and replace and all drop in claims of the present invention limited range.
Claims (10)
1. a pixel compensation circuit for active-matrix organic light emitting diode display, is characterized in that, described pixel compensation circuit comprises:
One first switch, has a first end, one second end and a control end, and the control end of described first switch is in order to receive a LED pulse signal, and the first end of described first switch is electrically coupled to a reference voltage;
One second switch, there is a first end, one second end and a control end, the control end of described second switch is in order to receive one second sweep signal, the first end of described second switch is electrically coupled to the second end of described first switch, and the second end of described second switch is electrically coupled to a data voltage;
One the 3rd switch, there is a first end, one second end and a control end, the control end of described 3rd switch is in order to receive one first sweep signal, and the second end of described 3rd switch is electrically coupled to the second end of described first switch and the first end of described second switch;
One the 4th switch, has a first end, one second end and a control end, and the control end of described 4th switch is electrically coupled to the first end of described 3rd switch, and the first end of described 4th switch is electrically coupled to one first voltage;
One the 5th switch, there is a first end, one second end and a control end, the control end of described 5th switch is in order to receive described second sweep signal, the first end of the 3rd switch described in the first end electric property coupling of described 5th switch and the control end of described 4th switch, the second end of the 4th switch described in the second end electric property coupling of described 5th switch;
One the 6th switch, has a first end, one second end and a control end, and the control end of described 6th switch is in order to receive described LED pulse signal, and the second end of described 6th switch is electrically coupled to the second end of described 4th switch;
One memory capacitance, has a first end and one second end, and the first end of described memory capacitance is electrically coupled to the second end of described first switch, and the second end of described memory capacitance is electrically coupled to the first end of described 3rd switch; And
One Organic Light Emitting Diode, its anode is electrically coupled to the first end of described 6th switch, and its negative electrode is electrically coupled to one second voltage, and described second voltage is less than described first voltage.
2. the pixel compensation circuit of active-matrix organic light emitting diode display according to claim 1, is characterized in that, described first switch to described 6th switch is a P-type TFT.
3. the pixel compensation circuit of active-matrix organic light emitting diode display according to claim 2, is characterized in that, the threshold voltage of the glow current and thin film transistor (TFT) that flow through this Organic Light Emitting Diode has nothing to do.
4. the pixel compensation circuit of active-matrix organic light emitting diode display according to claim 1, it is characterized in that, the combination of described first sweep signal, described second sweep signal and described LED pulse signal is corresponding in turn in a charging reseting period, a data write and between the amortization period and light period.
5. the pixel compensation circuit of active-matrix organic light emitting diode display according to claim 4, it is characterized in that, in described charging reseting period, described first sweep signal is a low level signal, described second sweep signal is a high level signal, and described LED pulse signal is a high level signal.
6. the pixel compensation circuit of active-matrix organic light emitting diode display according to claim 5, it is characterized in that, described first switch, described second switch, described 5th switch and described 6th switch are all in off state, and described 3rd switch and described 4th switch are all in opening state.
7. the pixel compensation circuit of active-matrix organic light emitting diode display according to claim 5, it is characterized in that, in described data write with between the amortization period, described first sweep signal is a high level signal, described second sweep signal is a low level signal, and described LED pulse signal is a high level signal.
8. the pixel compensation circuit of active-matrix organic light emitting diode display according to claim 7, it is characterized in that, described first switch and described 6th switch are all in off state, and described second switch, described 3rd switch, described 4th switch and described 5th switch are all in opening state.
9. the pixel compensation circuit of active-matrix organic light emitting diode display according to claim 7, it is characterized in that, period is lighted described, described first sweep signal is a high level signal, described second sweep signal is a high level signal, and described LED pulse signal is a low level signal.
10. the pixel compensation circuit of active-matrix organic light emitting diode display according to claim 9, it is characterized in that, described first switch, described 4th switch and described 6th switch are all in opening state, and described second switch, described 3rd switch and described 5th switch are all in off state.
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Application publication date: 20150325 |