CN104680977A - Pixel compensation circuit for high resolution AMOLED - Google Patents
Pixel compensation circuit for high resolution AMOLED Download PDFInfo
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- CN104680977A CN104680977A CN201510094209.3A CN201510094209A CN104680977A CN 104680977 A CN104680977 A CN 104680977A CN 201510094209 A CN201510094209 A CN 201510094209A CN 104680977 A CN104680977 A CN 104680977A
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Abstract
The invention provides a pixel compensation circuit for a high resolution AMOLED. The pixel compensation circuit comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a first capacitor, a second capacitor and an organic light-emitting diode, wherein the control end of the first switch is used for receiving a second scanning signal; the control end of the second switch is used for receiving a first scanning signal; the control end of the third switch is used for receiving the first scanning signal; the control end of the fourth switch is used for receiving the first scanning signal, and the second end of the fourth switch is coupled to a reference current source; the control end of the fifth switch is electrically coupled to the first end of the third switch; the first capacitor is coupled to the second end of the second switch and the first end of the fifth switch; the second capacitor is coupled to the first end and the first voltage of the first capacitor. Compared with the prior art, the pixel compensation circuit provided by the invention has the advantages that under the premise that the compensation time is unrestricted by panel resolution, the diode structure formed by the fifth switch is matched with the reference current source to compensate the current non-uniformity caused by the threshold voltage variation of a switch tube, the reference current source flows through the fifth switch to guarantee the black image quality, and then the contrast ratio of the whole image is improved.
Description
Technical field
The present invention relates to a kind of organic light emitting diode display, particularly relate to a kind of pixel compensation circuit for high resolving power active-matrix organic light emitting diode display (Active Matrix Organic Light Emitting Diode, AMOLED).
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 (Passive Matrix 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.
In the prior art, for having low-temperature polysilicon film transistor (Low Temperature Polycrystalline Silicon Thin Film Transistor, LTPS-TFT) AMOLED, it is in the encapsulation process of screen, utilize the equally distributed laser beam of excimer laser source produce power, be projeced on the glass substrate of amorphous silicon structures, make it change polysilicon structure into.Relative to amorphous silicon film transistor technology, the AMOLED resolution of employing LTPS-TFT technology is higher, response speed is faster, brightness is higher, contrast is higher, visible angle is wider, color saturation is higher, power consumption is lower.But switching threshold voltage (threshold voltage) and the variation of carrier transport factor (mobility) between different pixels of LTPS-TFT can cause the glow current flowing through Organic Light Emitting Diode uneven.In addition, aging along with Organic Light Emitting Diode, its forward voltage can increase along with the prolongation of running time, and the lower bad situation of degradation appears in luminescence efficiency.
In view of this, how designing a kind of pixel compensation circuit for high resolution A MOLED, 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 above-mentioned defect existing for the pixel compensation circuit for high resolution A MOLED of the prior art, the invention provides a kind of novelty, can the make-up time by the prerequisite of panel resolution restriction under so that the switching threshold voltage that compensates LTPS-TFT to make a variation the pixel compensation circuit of the even phenomenon of current unevenness caused.
According to one aspect of the present invention, provide a kind of pixel compensation circuit for high resolving power active-matrix organic light emitting diode 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 one second sweep signal, and the second end of described first switch is electrically coupled to a data 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 first sweep signal, the first end of described second switch is electrically coupled to a reference voltage, and the second end of described second switch is electrically coupled to the first end of described first switch;
One the 3rd switch, has a first end, one second end and a control end, and the control end of described 3rd switch is in order to receive described first sweep signal;
One the 4th switch, there is a first end, one second end and a control end, the control end of described 4th switch is in order to receive described first sweep signal, the first end of described 4th switch is electrically coupled to the second end of described 3rd switch, and the second end of described 4th switch is electrically coupled to a reference current source;
One the 5th switch, there is a first end, one second end and a control end, the control end of described 5th switch is electrically coupled to the first end of described 3rd switch, the first end of described 5th switch is electrically coupled to one first voltage, and the second end of described 5th switch is electrically coupled to the second end of described 3rd switch and the first end of described 4th switch;
One first electric capacity, has a first end and one second end, and the first end of described first electric capacity is electrically coupled to the second end of described second switch, and the second end of described first electric capacity is electrically coupled to the first end of described 5th switch;
One second electric capacity, has a first end and one second end, and the first end of described second electric capacity is electrically coupled to the first end of described first electric capacity, and the second end of described second electric capacity is electrically coupled to described first voltage; And
One Organic Light Emitting Diode, its anode is electrically coupled to the second end of described 3rd switch and the first end of described 4th switch, and its negative electrode is electrically coupled to one second voltage, and this second voltage is less than this first voltage.
An embodiment wherein, the sequential combination of described first sweep signal and described second sweep signal is corresponding in turn in one resetting between the amortization period, a data address period and one lights period.
An embodiment wherein, in between the described reset amortization period, described first sweep signal is a low level signal, described second sweep signal is a high level signal, described first switch is in off state, and described second switch, described 3rd switch, described 4th switch and described 5th switch are in opening state.
An embodiment wherein, in described data address period, described first sweep signal is a high level signal, described second sweep signal is a low level signal, described second switch, described 3rd switch and described 4th switch are in off state, and described first switch and described 5th switch are in opening state.
An embodiment wherein, period is lighted in described, described first sweep signal and described second sweep signal are a high level signal, and described first switch, described second switch, described 3rd switch and described 4th switch are all in off state, and described 5th switch is in opening state.
According to another aspect of the present invention, provide a kind of pixel compensation circuit for high resolving power active-matrix organic light emitting diode 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 one second sweep signal, and the second end of described first switch is electrically coupled to a data 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 first sweep signal, second end of described second switch is electrically coupled to a reference voltage, and the first end of described second switch is electrically coupled to the first end of described first switch;
One the 3rd switch, has a first end, one second end and a control end, and the control end of described 3rd switch is in order to receive described first sweep signal;
One the 4th switch, there is a first end, one second end and a control end, the control end of described 4th switch is in order to receive described first sweep signal, the first end of described 4th switch is electrically coupled to the second end of described 3rd switch, and the second end of described 4th switch is electrically coupled to a reference current source;
One the 5th switch, there is a first end, one second end and a control end, the control end of described 5th switch is electrically coupled to the first end of described 3rd switch, the first end of described 5th switch is electrically coupled to one first voltage, and the second end of described 5th switch is electrically coupled to the second end of described 3rd switch and the first end of described 4th switch;
One first electric capacity, there is a first end and one second end, the first end of described first electric capacity is electrically coupled to the first end of described second switch, and the second end of described first electric capacity is electrically coupled to the control end of described 5th switch and the first end of described 3rd switch;
One second electric capacity, has a first end and one second end, and the first end of described second electric capacity is electrically coupled to the second end of described first electric capacity, and the second end of described second electric capacity is electrically coupled to described first voltage; And
One Organic Light Emitting Diode, its anode is electrically coupled to the second end of described 3rd switch and the first end of described 4th switch, and its negative electrode is electrically coupled to one second voltage, and this second voltage is less than this first voltage.
An embodiment wherein, the sequential combination of described first sweep signal and described second sweep signal is corresponding in turn in one resetting between the amortization period, a data address period and one lights period.
An embodiment wherein, in between the described reset amortization period, described first sweep signal is a low level signal, described second sweep signal is a high level signal, described first switch is in off state, and described second switch, described 3rd switch, described 4th switch and described 5th switch are in opening state.
An embodiment wherein, in described data address period, described first sweep signal is a high level signal, described second sweep signal is a low level signal, described second switch, described 3rd switch and described 4th switch are in off state, and described first switch and described 5th switch are in opening state.
An embodiment wherein, period is lighted in described, described first sweep signal and described second sweep signal are a high level signal, and described first switch, described second switch, described 3rd switch and described 4th switch are all in off state, and described 5th switch is in opening state.
Adopt the pixel compensation circuit for high resolving power active-matrix organic light emitting diode display of the present invention, the control end of its first switch receives one second sweep signal, the control end of second switch receives one first sweep signal, the control end of the 3rd switch receives the first sweep signal, the control end of the 4th switch receives the first sweep signal, the control end of the 5th switch is electrically coupled to the first end of the 3rd switch and first end is electrically coupled to one first voltage, the first end of the first electric capacity is electrically coupled to the second end of second switch and the second end is electrically coupled to the first end of the 5th switch, the first end of the second electric capacity is electrically coupled to the first end of the first electric capacity and the second end is electrically coupled to the first voltage, compared to prior art, the invention provides one " 5T2C " (namely, comprise five switches and two electric capacity) pixel compensation circuit, under the prerequisite that the make-up time does not limit by panel resolution, the threshold voltage that the diode framework formed through the 5th switch coordinates reference current source to carry out compensating switch pipe makes a variation the even property of current unevenness caused, the 5th switch is flow through to guarantee black image quality again via reference current source, and then improve the contrast of whole picture.
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 illustrates according to an embodiment of the present invention, for the structural representation of the pixel compensation circuit of high resolving power active-matrix organic light emitting diode display;
Fig. 3 A illustrates that the pixel compensation circuit working of Fig. 2 is in the view resetted and between the amortization period;
Fig. 3 B illustrates that the key signal of the pixel compensation circuit of Fig. 2 is at the timing waveform resetted and between the amortization period;
Fig. 4 A illustrates that the pixel compensation circuit working of Fig. 2 is in the view of data address period;
Fig. 4 B illustrates the timing waveform of key signal in data address period of the pixel compensation circuit of Fig. 2;
Fig. 5 A illustrates that the pixel compensation circuit working of Fig. 2 is in the view lighting period;
Fig. 5 B illustrates that the key signal of the pixel compensation circuit of Fig. 2 is at the timing waveform lighting period;
Fig. 6 illustrates the pixel compensation circuit adopting Fig. 2, as threshold voltage variation+0.5V and the-0.5V of switching tube, and the schematic diagram data of the Opposed Current error rate (relative current error rate) in all data voltage range;
Fig. 7 illustrates the pixel compensation circuit adopting Fig. 2, as the first voltage Vdd decline 0.5V, and the schematic diagram data of the Opposed Current error rate in all data voltage range;
Fig. 8 illustrates according to another embodiment of the present invention, for the structural representation of the pixel compensation circuit of high resolving power active-matrix organic light emitting diode display;
Fig. 9 A illustrates that the pixel compensation circuit working of Fig. 8 is in the view resetted and between the amortization period;
Fig. 9 B illustrates that the key signal of the pixel compensation circuit of Fig. 8 is at the timing waveform resetted and between the amortization period;
Figure 10 A illustrates that the pixel compensation circuit working of Fig. 8 is in the view of data address period;
Figure 10 B illustrates the timing waveform of key signal in data address period of the pixel compensation circuit of Fig. 8;
Figure 11 A illustrates that the pixel compensation circuit working of Fig. 8 is in the view lighting period;
Figure 11 B illustrates that the key signal of the pixel compensation circuit of Fig. 8 is at the timing waveform lighting period;
Figure 12 illustrates the pixel compensation circuit adopting Fig. 8, as threshold voltage variation+0.5V and the-0.5V of switching tube, and the schematic diagram data of the Opposed Current error rate (relative current error rate) in all data voltage range;
Figure 13 illustrates the pixel compensation circuit adopting Fig. 8, as the first voltage Vdd decline 0.5V, and the schematic diagram data of the Opposed Current error rate in all data voltage range.
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.
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.
With reference to Fig. 1, this pixel compensation circuit is one " 2T1C " framework, and 2T here and thin film transistor (TFT) T11 and thin film transistor (TFT) T12,1C are the memory capacitance C11 of institute's cross-over connection between the grid of thin film transistor (TFT) T12 and drain electrode.That is term " mTnC " represents that the number of thin film transistor (TFT) is m, the number of memory capacitance is n, m, n is natural number.
Wherein, the grid of thin film transistor (TFT) T11 is electrically connected to one scan signal Scan, and source electrode is for receiving a data voltage signal, and drain electrode is connected with the grid of thin film transistor (TFT) T12.The drain electrode of thin film transistor (TFT) T12 is electrically connected to a common electric voltage VDD, and source electrode is connected to a ground voltage via Organic Light Emitting Diode OLED.When driving luminous, have electric current above VDD and flow through, because the VDD on panel is connected to each pixel, and VDD metal transmission line itself has impedance, and thus this VDD can there are differences for different pixels.As previously mentioned, owing to there is current difference between different pixels, even if receive identical data voltage signal, the electric current flowing through OLED also can be different, and then make Display panel uneven.
Fig. 2 illustrates according to an embodiment of the present invention, for the structural representation of the pixel compensation circuit of high resolving power active-matrix organic light emitting diode display.
With reference to Fig. 2, pixel compensation circuit of the present invention adopts 5T2C framework, and it comprises the first switch T1, second switch T2, the 3rd switch T3, the 4th switch T4, the 5th switch T5, the first electric capacity C1 and the second electric capacity C2.Such as, the first switch T1 is a P-type TFT to the 5th switch T5, when grid applies low level voltage, and switch conduction; When grid applies high level voltage, switch OFF.
Specifically, the grid of the first switch T1 is in order to receive one second sweep signal Scan2, the drain electrode of the first switch T1 (or source electrode, be electrically coupled to down together) source electrode of second switch T2, the source electrode of the first switch T1 (or drain electrode, lower with) is electrically coupled to a data voltage Vdata.The grid of second switch T2 is in order to receive one first sweep signal Scan1, and the drain electrode of second switch T2 is electrically coupled to a reference voltage Vref, and the source electrode of second switch T2 and the drain electrode electric property coupling of the first switch T1 also intersect at node C.
The grid of the 3rd switch T3 is in order to receive the first sweep signal Scan1, the source electrode of the 3rd switch T3 is electrically coupled to the source electrode of the 5th switch T5 and the anode of Organic Light Emitting Diode OLED, and the drain electrode of the 3rd switch T3 is electrically coupled to grid and the first electric capacity C1 of the 5th switch T5.The grid of the 4th switch T4 in order to receive the first sweep signal Scan1, the source electrode electric property coupling of the drain electrode of the 4th switch T4, the source electrode of the 3rd switch T3 and the 5th switch T5 and intersect at Node B.
The grid of the 5th switch T5 is electrically coupled to drain electrode and the first electric capacity C1 of the 3rd switch T3, and the drain electrode of the 5th switch T5 is electrically coupled to the first voltage Vdd.First electric capacity C1 has first end and the second end, and the first end of the first electric capacity C1 is electrically coupled to the source electrode of second switch T2, and second end of the first electric capacity C1 is electrically coupled to the grid of the 5th switch T5.Second electric capacity C2 also has first end and the second end, and the first end of the second electric capacity C2 is electrically coupled to the first end of the first electric capacity C1, the drain electrode of the first switch T1 and the source electrode of second switch T2, and second end of the second electric capacity C2 is electrically coupled to the first voltage Vdd.The anode of Organic Light Emitting Diode OLED is electrically coupled to the source electrode of the source electrode of the 3rd switch T3, the drain electrode of the 4th switch T4 and the 5th switch T5, and negative electrode is electrically coupled to the second voltage Vss, and this second voltage Vss is less than this first voltage Vdd.
From the pixel compensation circuit of Fig. 2, the present invention utilizes the threshold voltage variation of reference current source detection switch pipe, and utilize this reference current source to make the 5th switch T5 produce enough large gate source voltage to reduce the voltage of Organic Light Emitting Diode OLED anode tap, thus avoid the electric current when black picture to flow through OLED, increase the contrast of picture.
Fig. 3 A illustrates that the pixel compensation circuit working of Fig. 2 is in the view resetted and between the amortization period, and Fig. 3 B illustrates that the key signal of the pixel compensation circuit of Fig. 2 is at the timing waveform resetted and between the amortization period.
With reference to Fig. 3 A and Fig. 3 B, as this circuit working (reset & compensation period) t between reset and amortization period
atime, the first sweep signal Scan1 is low level signal, and the second sweep signal Scan2 is high level signal.Accordingly, the first switch T1 is in off state, and second switch T2, the 3rd switch T3, the 4th switch T4 and the 5th switch T5 are all in opening state.Now, the voltage of node C is reference voltage Vref, and the voltage of node A meets relational expression:
Through setting reference current source Iref, the voltage of node A is made to be less than the second voltage Vss and Organic Light Emitting Diode threshold voltage V
oLEDsum, lights to avoid Organic Light Emitting Diode OLED.
Fig. 4 A illustrates that the pixel compensation circuit working of Fig. 2 is in the view of data address period, and Fig. 4 B illustrates the timing waveform of key signal in data address period of the pixel compensation circuit of Fig. 2.
With reference to Fig. 4 A and Fig. 4 B, when this circuit working is at data address period (data input period) t
btime, the first sweep signal Scan1 is high level signal, and the second sweep signal Scan2 is low level signal.Accordingly, second switch T2, the 3rd switch T3 and the 4th switch T4 are all in off state, and the first switch T1 and the 5th switch T5 is all in opening state.Now, the voltage of node C is data voltage Vdata, and the voltage of node A meets following relational expression:
Fig. 5 A illustrates that the pixel compensation circuit working of Fig. 2 is in the view lighting period, and Fig. 5 B illustrates that the key signal of the pixel compensation circuit of Fig. 2 is at the timing waveform lighting period.
With reference to Fig. 5 A and Fig. 5 B, when this circuit working is lighting period (emission period) t
ctime, the first sweep signal Scan1 is high level signal, and the second sweep signal Scan2 is high level signal.Accordingly, the first switch T1, second switch T2, the 3rd switch T3 and the 4th switch T4 are all in off state, and the 5th switch T5 is in opening state.Now, the voltage of node C is data voltage Vdata, and the voltage of node A keeps equal with data address period during lighting.Now, the electric current I of this Organic Light Emitting Diode OLED is flowed through
oLEDmeet following relational expression:
Wherein K, k are constant, because threshold voltage vt h, the first voltage Vdd of the electric current and switching tube that flow through Organic Light Emitting Diode OLED have nothing to do, thus pixel compensation circuit of the present invention successfully can compensate the drift of above-mentioned threshold voltage vt h and the reduction of the first voltage Vdd.
Fig. 6 illustrates the pixel compensation circuit adopting Fig. 2, as threshold voltage variation+0.5V and the-0.5V of switching tube (as: the 5th switch T5), the schematic diagram data of the Opposed Current error rate (relative current error rate) in all data voltage range.
As can be seen from Figure 6, in all data voltage range (such as 0.5V ~ 2.3V), as threshold voltage variation+0.5V or the-0.5V of switching tube (as: the 5th switch T5), its Opposed Current error rate is all no more than 4%, thus can the threshold voltage shift of compensating switch pipe effectively.
Fig. 7 illustrates the pixel compensation circuit adopting Fig. 2, as the first voltage Vdd decline 0.5V, and the schematic diagram data of the Opposed Current error rate in all data voltage range.
As can be seen from Figure 7, in all data voltage range (such as 0.5V ~ 2.3V), as the first voltage Vdd decline 0.5V, its Opposed Current error rate is all no more than 1.5%, and the electric current thus flowing through this Organic Light Emitting Diode is very little by the impact of the first change in voltage.
Fig. 8 illustrates according to another embodiment of the present invention, for the structural representation of the pixel compensation circuit of high resolving power active-matrix organic light emitting diode display.
Compared by Fig. 8 and Fig. 2, its key distinction is, the second electric capacity C2 putting position in second electric capacity C2 and Fig. 2 in Fig. 8 is different.Specifically, one end of the second electric capacity C2 is electrically coupled to the first electric capacity C1, the drain electrode of the 3rd switch T3 and the grid of the 5th switch T5 thus forms node A, and the other end is electrically coupled to the drain electrode of the first voltage Vdd and the 5th switch T5.Other circuit connecting relation and Fig. 2 similar, do not repeat them here.
Fig. 9 A illustrates that the pixel compensation circuit working of Fig. 8 is in the view resetted and between the amortization period, and Fig. 9 B illustrates that the key signal of the pixel compensation circuit of Fig. 8 is at the timing waveform resetted and between the amortization period.
With reference to Fig. 9 A and Fig. 9 B, as this circuit working (reset & compensation period) t between reset and amortization period
atime, the first sweep signal Scan1 is low level signal, and the second sweep signal Scan2 is high level signal.Accordingly, the first switch T1 is in off state, and second switch T2, the 3rd switch T3, the 4th switch T4 and the 5th switch T5 are all in opening state.Now, the voltage of node C is reference voltage Vref, and the voltage of node A meets relational expression:
Through setting reference current source Iref, the voltage of node A is made to be less than the second voltage Vss and Organic Light Emitting Diode threshold voltage V
oLEDsum, lights to avoid Organic Light Emitting Diode OLED.
Figure 10 A illustrates that the pixel compensation circuit working of Fig. 8 is in the view of data address period, and Figure 10 B illustrates the timing waveform of key signal in data address period of the pixel compensation circuit of Fig. 8.
With reference to Figure 10 A and Figure 10 B, when this circuit working is at data address period (data input period) t
btime, the first sweep signal Scan1 is high level signal, and the second sweep signal Scan2 is low level signal.Accordingly, second switch T2, the 3rd switch T3 and the 4th switch T4 are all in off state, and the first switch T1 and the 5th switch T5 is all in opening state.Now, the voltage of node C is data voltage Vdata, and the voltage of node A meets following relational expression:
Figure 11 A illustrates that the pixel compensation circuit working of Fig. 8 is in the view lighting period, and Figure 11 B illustrates that the key signal of the pixel compensation circuit of Fig. 8 is at the timing waveform lighting period.
With reference to Figure 11 A and Figure 11 B, when this circuit working is lighting period (emission period) t
ctime, the first sweep signal Scan1 is high level signal, and the second sweep signal Scan2 is high level signal.Accordingly, the first switch T1, second switch T2, the 3rd switch T3 and the 4th switch T4 are all in off state, and the 5th switch T5 is in opening state.Now, the voltage of Node B is the threshold voltage V of the second voltage Vss and Organic Light Emitting Diode OLED
oLEDsum.Now, the electric current I of this Organic Light Emitting Diode OLED is flowed through
oLEDmeet following relational expression:
Wherein K is constant, and because threshold voltage vt h, the first voltage Vdd of the electric current and switching tube that flow through Organic Light Emitting Diode OLED are all irrelevant, thus pixel compensation circuit of the present invention successfully can compensate the drift of above-mentioned threshold voltage and the reduction of the first voltage.
Figure 12 illustrates the pixel compensation circuit adopting Fig. 8, as threshold voltage variation+0.5V and the-0.5V of switching tube (as: the 5th switch T5), the schematic diagram data of the Opposed Current error rate (relative current error rate) in all data voltage range.
As can be seen from Figure 12, in all data voltage range (such as 0.5V ~ 3.5V), as threshold voltage variation+0.5V or the-0.5V of switching tube (as: the 5th switch T5), its Opposed Current error rate is all no more than 4%, thus can the threshold voltage shift of compensating switch pipe effectively.
Figure 13 illustrates the pixel compensation circuit adopting Fig. 8, as the first voltage Vdd decline 0.5V, and the schematic diagram data of the Opposed Current error rate in all data voltage range.
As can be seen from Figure 13, in all data voltage range (such as 0.5V ~ 3.5V), as the first voltage Vdd decline 0.5V, its Opposed Current error rate is all no more than 1%, and the electric current thus flowing through this Organic Light Emitting Diode is very little by the impact of the first change in voltage.
Adopt the pixel compensation circuit for high resolving power active-matrix organic light emitting diode display of the present invention, the control end of its first switch receives one second sweep signal, the control end of second switch receives one first sweep signal, the control end of the 3rd switch receives the first sweep signal, the control end of the 4th switch receives the first sweep signal, the control end of the 5th switch is electrically coupled to the first end of the 3rd switch and first end is electrically coupled to one first voltage, the first end of the first electric capacity is electrically coupled to the second end of second switch and the second end is electrically coupled to the first end of the 5th switch, the first end of the second electric capacity is electrically coupled to the first end of the first electric capacity and the second end is electrically coupled to the first voltage, compared to prior art, the invention provides one " 5T2C " (namely, comprise five switches and two electric capacity) pixel compensation circuit, under the prerequisite that the make-up time does not limit by panel resolution, the threshold voltage that the diode framework formed through the 5th switch coordinates reference current source to carry out compensating switch pipe makes a variation the even property of current unevenness caused, the 5th switch is flow through to guarantee black image quality again via reference current source, and then improve the contrast of whole picture.
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., for a pixel compensation circuit of high resolving power active-matrix organic light emitting diode display (Active Matrix Organic Light Emitting Diode, AMOLED), it 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 one second sweep signal, and the second end of described first switch is electrically coupled to a data 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 first sweep signal, the first end of described second switch is electrically coupled to a reference voltage, and the second end of described second switch is electrically coupled to the first end of described first switch;
One the 3rd switch, has a first end, one second end and a control end, and the control end of described 3rd switch is in order to receive described first sweep signal;
One the 4th switch, there is a first end, one second end and a control end, the control end of described 4th switch is in order to receive described first sweep signal, the first end of described 4th switch is electrically coupled to the second end of described 3rd switch, and the second end of described 4th switch is electrically coupled to a reference current source;
One the 5th switch, there is a first end, one second end and a control end, the control end of described 5th switch is electrically coupled to the first end of described 3rd switch, the first end of described 5th switch is electrically coupled to one first voltage, and the second end of described 5th switch is electrically coupled to the second end of described 3rd switch and the first end of described 4th switch;
One first electric capacity, has a first end and one second end, and the first end of described first electric capacity is electrically coupled to the second end of described second switch, and the second end of described first electric capacity is electrically coupled to the first end of described 5th switch;
One second electric capacity, has a first end and one second end, and the first end of described second electric capacity is electrically coupled to the first end of described first electric capacity, and the second end of described second electric capacity is electrically coupled to described first voltage; And
One Organic Light Emitting Diode, its anode is electrically coupled to the second end of described 3rd switch and the first end of described 4th switch, and its negative electrode is electrically coupled to one second voltage, and this second voltage is less than this first voltage.
2. pixel compensation circuit according to claim 1, is characterized in that, the sequential combination of described first sweep signal and described second sweep signal is corresponding in turn in one resetting between the amortization period, a data address period and one lights period.
3. pixel compensation circuit according to claim 2, it is characterized in that, between the described reset amortization period, described first sweep signal is a low level signal, described second sweep signal is a high level signal, described first switch is in off state, and described second switch, described 3rd switch, described 4th switch and described 5th switch are in opening state.
4. pixel compensation circuit according to claim 2, it is characterized in that, in described data address period, described first sweep signal is a high level signal, described second sweep signal is a low level signal, described second switch, described 3rd switch and described 4th switch are in off state, and described first switch and described 5th switch are in opening state.
5. pixel compensation circuit according to claim 2, it is characterized in that, period is lighted described, described first sweep signal and described second sweep signal are a high level signal, described first switch, described second switch, described 3rd switch and described 4th switch are all in off state, and described 5th switch is in opening state.
6., for a pixel compensation circuit of high resolving power active-matrix organic light emitting diode display (Active Matrix Organic Light Emitting Diode, AMOLED), it 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 one second sweep signal, and the second end of described first switch is electrically coupled to a data 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 first sweep signal, second end of described second switch is electrically coupled to a reference voltage, and the first end of described second switch is electrically coupled to the first end of described first switch;
One the 3rd switch, has a first end, one second end and a control end, and the control end of described 3rd switch is in order to receive described first sweep signal;
One the 4th switch, there is a first end, one second end and a control end, the control end of described 4th switch is in order to receive described first sweep signal, the first end of described 4th switch is electrically coupled to the second end of described 3rd switch, and the second end of described 4th switch is electrically coupled to a reference current source;
One the 5th switch, there is a first end, one second end and a control end, the control end of described 5th switch is electrically coupled to the first end of described 3rd switch, the first end of described 5th switch is electrically coupled to one first voltage, and the second end of described 5th switch is electrically coupled to the second end of described 3rd switch and the first end of described 4th switch;
One first electric capacity, there is a first end and one second end, the first end of described first electric capacity is electrically coupled to the first end of described second switch, and the second end of described first electric capacity is electrically coupled to the control end of described 5th switch and the first end of described 3rd switch;
One second electric capacity, has a first end and one second end, and the first end of described second electric capacity is electrically coupled to the second end of described first electric capacity, and the second end of described second electric capacity is electrically coupled to described first voltage; And
One Organic Light Emitting Diode, its anode is electrically coupled to the second end of described 3rd switch and the first end of described 4th switch, and its negative electrode is electrically coupled to one second voltage, and this second voltage is less than this first voltage.
7. pixel compensation circuit according to claim 6, is characterized in that, the sequential combination of described first sweep signal and described second sweep signal is corresponding in turn in one resetting between the amortization period, a data address period and one lights period.
8. pixel compensation circuit according to claim 7, it is characterized in that, between the described reset amortization period, described first sweep signal is a low level signal, described second sweep signal is a high level signal, described first switch is in off state, and described second switch, described 3rd switch, described 4th switch and described 5th switch are in opening state.
9. pixel compensation circuit according to claim 7, it is characterized in that, in described data address period, described first sweep signal is a high level signal, described second sweep signal is a low level signal, described second switch, described 3rd switch and described 4th switch are in off state, and described first switch and described 5th switch are in opening state.
10. pixel compensation circuit according to claim 7, it is characterized in that, period is lighted described, described first sweep signal and described second sweep signal are a high level signal, described first switch, described second switch, described 3rd switch and described 4th switch are all in off state, and described 5th switch is in opening state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510094209.3A CN104680977A (en) | 2015-03-03 | 2015-03-03 | Pixel compensation circuit for high resolution AMOLED |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510094209.3A CN104680977A (en) | 2015-03-03 | 2015-03-03 | Pixel compensation circuit for high resolution AMOLED |
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| CN104680977A true CN104680977A (en) | 2015-06-03 |
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| CN201510094209.3A Pending CN104680977A (en) | 2015-03-03 | 2015-03-03 | Pixel compensation circuit for high resolution AMOLED |
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Application publication date: 20150603 |