CN105355170A - Pixel compensating circuit for active matrix organic light-emitting diode display - Google Patents
Pixel compensating circuit for active matrix organic light-emitting diode display Download PDFInfo
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- CN105355170A CN105355170A CN201510915220.1A CN201510915220A CN105355170A CN 105355170 A CN105355170 A CN 105355170A CN 201510915220 A CN201510915220 A CN 201510915220A CN 105355170 A CN105355170 A CN 105355170A
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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]
- G09G3/3208—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] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—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] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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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]
- G09G3/3208—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] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—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] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—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] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
Abstract
The invention provides a pixel compensating circuit for an active matrix organic light-emitting diode display, and the circuit comprises a first switch, wherein the control end of the first switch receives a second control signal; a second switch, wherein the control end of the second switch receives a first control signal; a third switch, wherein the control end of the third switch receives the second control signal; a fourth switch, wherein the control end of the fourth switch receives the second control signal; a fifth switch; a sixth switch, wherein the control end of the sixth switch receives a third control signal and a first end of the sixth switch is electrically coupled to a first voltage; a seventh switch, wherein the control end of the seventh switch is electrically coupled to the control end of the sixth switch; an eighth switch, wherein the control end of the eighth switch receives the second control signal; a storage capacitor; and an organic light-emitting diode, wherein the anode of the organic light-emitting diode is electrically coupled to a second end of the fifth switch, and the cathode of the organic light-emitting diode is electrically coupled to a second voltage. Compared with the prior art, the circuit is provided with two lighting intervals in each operation period, and can remarkably improve key performance indexes through a proper control strategy of circuit operation, such as response time and image residual. The circuit improves the image quality of the organic light-emitting diode display.
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 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 the Organic Light Emitting Diode (OrganicLightEmittingDiode 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 (PassiveMatrixOLED, PMOLED) and active matrix drive (ActiveMatrixOLED, 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 the electric capacity for storing 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, 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, causes the brightness irregularities of display frame.Moreover, existing pixel compensation circuit only can compensating threshold voltage and the electric current uniformity coefficient caused that declines compensate, and other Key Performance Indicator of Organic Light Emitting Diode cannot be improved, such as the response time (responsetime), image retention (imageretention) and absolute black time brightness.
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 displayer of the prior art pixel compensation circuit existing for above-mentioned defect, the invention provides a kind of newly, the pixel compensation circuit of the displayer of the Key Performance Indicator that can improve such as response time and image retention problem.
According to one aspect of the present invention, provide a kind of pixel compensation circuit of displayer, comprising:
One first switch, have a first end, one second end and a control end, the second end of described first switch is electrically coupled to a reference voltage, and the control end of described first switch is in order to receive one second control signal;
One second switch, has a first end, one second end and a control end, and the control end of described second switch is in order to receive one first control signal, and the second end of described second switch is electrically coupled to an initial voltage;
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 second control signal, and the second end of described 3rd switch is electrically coupled to 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 in order to receive described second control signal, and the first end of described 4th switch is electrically coupled to the second end of described 3rd switch;
One the 5th switch, has a first end, one second end and a control end, and the control end of described 5th switch is electrically coupled to the first end of described 3rd switch, and the second end of described 5th switch is electrically coupled to the second end of described 4th switch;
One the 6th switch, there is a first end, one second end and a control end, the control end of described 6th switch is in order to receive one the 3rd control signal, the first end of described 6th switch is electrically coupled to one first voltage, and the second end of described 6th switch is electrically coupled to the first end of described first switch;
One the 7th switch, there is a first end, one second end and a control end, the control end of described 7th switch is electrically coupled to the control end of described 6th switch, the first end of described 7th switch is electrically coupled to the second end of described 6th switch, and the second end of described 7th switch is electrically coupled to the first end of described 5th switch;
One the 8th switch, there is a first end, one second end and one the 3rd end, the control end of described 8th switch is in order to receive described second control signal, the first end of described 8th switch is electrically coupled to a data voltage, and the second end of described 8th switch is electrically coupled to the first end of described 5th switch and the second end of described 7th switch;
One memory capacitance, there is a first end and one second end, the first end of the first switch described in the first end electric property coupling of described memory capacitance and the second end of described 6th switch, the second end of described memory capacitance is electrically coupled to the first end of described 3rd switch and the control end of described 5th switch; And
One Organic Light Emitting Diode, the second end of the 5th switch described in its anode electric property coupling, 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 8th switch is a P-type TFT.
An embodiment wherein, the glow current flowing through described Organic Light Emitting Diode is relevant with described data voltage with described reference voltage, and has nothing to do with the threshold voltage of thin film transistor (TFT).
An embodiment wherein, the combination of described first control signal, described second control signal and described 3rd control signal be corresponding in turn in one first light period, a reseting period, between an amortization period and one second light period.
An embodiment wherein, in described reseting period, described first control signal is a low level signal, and described second control signal is a low level signal, and described 3rd control signal is a high level signal.
An embodiment wherein, described 6th switch and the 7th switch are all in off state, and described first switch, second switch, the 3rd switch, the 4th switch, the 5th switch and the 8th switch are in opening state.
An embodiment wherein, between the described amortization period, described first control signal is a high level signal, and described second control signal is a low level signal, and described 3rd control signal is a high level signal.
An embodiment wherein, described second switch, the 6th switch and the 7th switch are all in off state, and described first switch, the 3rd switch, the 4th switch, the 5th switch and the 8th switch are in opening state.
An embodiment wherein, light period and described second described first and light period, described first control signal is a high level signal, and described second control signal is a high level signal, and described 3rd control signal is a low level signal.
An embodiment wherein, light period and described second described first and light period, described first switch, second switch, the 3rd switch, the 4th switch and the 8th switch are in off state.Described 5th switch, the 6th switch and the 7th switch are all in opening state, and described first voltage, the 6th switch, the 7th switch, the 5th switch, Organic Light Emitting Diode and described second voltage form a conductive path.
Adopt the pixel compensation circuit of displayer of the present invention, it comprises eight switches, a memory capacitance and an Organic Light Emitting Diode, second end of the first switch is electrically coupled to a reference voltage and control end receives one second control signal, the control end of second switch receives one first control signal and the second end is electrically coupled to an initial voltage, the control end of the 3rd switch receives the second control signal and the second end of the 3rd switch is electrically coupled to the first end of second switch, the control end of the 4th switch receives the second control signal and the first end of the 4th switch is electrically coupled to the second end of the 3rd switch, the control end of the 5th switch is electrically coupled to the first end of the 3rd switch and the second end of the 5th switch is electrically coupled to the second end of the 4th switch, the control end of the 6th switch receives one the 3rd control signal, the second end that first end is electrically coupled to one first voltage and the 6th switch is electrically coupled to the first end of the first switch, the control end of the 7th switch is electrically coupled to the control end of the 6th switch, second end of the second end and the 7th switch that first end is electrically coupled to the 6th switch is electrically coupled to the first end of the 5th switch, the control end of the 8th switch receives the second control signal, the second end that first end is electrically coupled to a data voltage and the 8th switch is electrically coupled to the first end of the 5th switch and the second end of the 7th switch, the first end of first end electric property coupling first switch of memory capacitance and the second end of the 6th switch, second end of memory capacitance is electrically coupled to the first end of the 3rd switch and the control end of the 5th switch, second end of anode electric property coupling the 5th switch of Organic Light Emitting Diode, negative electrode is electrically coupled to one second voltage, and the second voltage is less than the first voltage.Compared to prior art, the present invention is under the condition of limited pixel switch number, arrange two in each operation period and light period, and utilize the suitable control strategy of circuit operation significantly can improve the such as Key Performance Indicator such as response time and image retention, improve the picture quality of organic light emitting diode display.
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 the structural representation of the pixel compensation circuit of the active-matrix organic light emitting diode display according to one embodiment of the present invention;
Fig. 3 A illustrates that the pixel compensation circuit working of Fig. 2 lights the view of period in first;
Fig. 3 B illustrates that three kinds of control signals of the pixel compensation circuit of Fig. 3 A light the timing waveform of period first;
Fig. 4 A illustrates that the pixel compensation circuit working of Fig. 2 is in the view of reseting period;
Fig. 4 B illustrates the timing waveform of three kinds of control signals at reseting period of the pixel compensation circuit of Fig. 4 A;
Fig. 5 A illustrates the view of pixel compensation circuit working between the amortization period of Fig. 2;
Fig. 5 B illustrates the timing waveform of three kinds of control signals between the amortization period of the pixel compensation circuit of Fig. 5 A;
Fig. 6 A illustrates that the pixel compensation circuit working of Fig. 2 lights the view of period in second; And
Fig. 6 B illustrates that three kinds of control signals of the pixel compensation circuit of Fig. 6 A light the timing waveform of period second.
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.
With reference to the accompanying drawings, the embodiment of various aspects of the present invention is described in further detail.
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, existing 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 source 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 S11, and source electrode is for receiving a data voltage signal Vdata1, and drain electrode is connected with the grid of thin film transistor (TFT) T12.The source electrode of thin film transistor (TFT) T12 is electrically connected to a common electric voltage VDD1, drains to be connected to a ground voltage VSS1 via Organic Light Emitting Diode OLED1.When driving luminous, have electric current above common electric voltage VDD1 and flow through, because the VDD1 on panel is connected to each pixel, and common electric voltage VDD1 metal transmission line itself has impedance, and thus this common electric voltage VDD1 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 OLED1 also can be different, and then make Display panel uneven.As mentioned before, although some pixel compensation circuit existing can compensating threshold voltage and the electric current uniformity coefficient caused that declines compensate, but other Key Performance Indicator of Organic Light Emitting Diode can not be improved, such as the response time (responsetime), image retention (imageretention) and absolute black time brightness.
In order to solve above-mentioned defect of the prior art or deficiency, disclosed herein a kind of pixel compensation circuit of novelty.Fig. 2 illustrates the structural representation of the pixel compensation circuit of the active-matrix organic light emitting diode display according to one embodiment of the present invention.
With reference to Fig. 2, in this embodiment, pixel compensation circuit of the present invention adopts " 8T1C " framework, and it comprises the first switch T1, second switch T2, the 3rd switch T3, the 4th switch T4, the 5th switch T5, the 6th switch T6, the 7th switch T7, the 8th switch T8 and memory capacitance C1.Such as, the first switch T1 is a P-type TFT to the 8th switch T8, when grid applies low level voltage, and switch conduction; When grid applies high level voltage, switch cut-off (or being called shutoff).
Specifically, the drain electrode of the first switch T1 is electrically coupled to a reference voltage Vref.The grid of the first switch T1 is in order to receive one second control signal S2.The grid of second switch T2 is in order to receive one first control signal S1.The drain electrode of second switch T2 is electrically coupled to an initial voltage Vini.The grid of the 3rd switch T3 is in order to receive the second control signal S2.The drain electrode of the 3rd switch T3 is electrically coupled to the source electrode of second switch T2.The grid of the 4th switch T4 is in order to receive the second control signal S2.The source electrode of the 4th switch T4 is electrically coupled to the drain electrode of the 3rd switch T3.In one embodiment, switch T3 and switch T4 accessible site are in same integrated chip, and this chip comprises two switches, the outlet pin that each switch is all corresponding different.
The grid of the 5th switch T5 is electrically coupled to the source electrode of the 3rd switch T3.The drain electrode of the 5th switch T5 is electrically coupled to the drain electrode of the 4th switch T4.The grid of the 6th switch T6 is in order to receive one the 3rd control signal S3.The source electrode of the 6th switch T6 is electrically coupled to one first voltage VDD.The drain electrode of the 6th switch T6 is electrically coupled to the source electrode of the first switch T1.The grid of the 7th switch T7 is electrically coupled to the grid of the 6th switch T6.The source electrode of the 7th switch T7 is electrically coupled to the drain electrode of the 6th switch T6.The drain electrode of the 7th switch T7 is electrically coupled to the source electrode of the 5th switch T5.The grid of the 8th switch T8 is in order to receive the second control signal S2.The source electrode of the 8th switch T8 is electrically coupled to a data voltage Vdata.The drain electrode of the 8th switch T8 is electrically coupled to the source electrode of the 5th switch T5 and the drain electrode of the 7th switch T7.In one embodiment, also accessible site is in same integrated chip for switch T6 and switch T7, and this chip comprises two switches, the outlet pin that each switch is all corresponding different.
The source electrode of first end electric property coupling first switch T1 of memory capacitance C1 and the drain electrode of the 6th switch T6.Second end of memory capacitance C1 is electrically coupled to the source electrode of the 3rd switch T3 and the grid of the 5th switch T5.The drain electrode of anode electric property coupling the 5th switch T5 of Organic Light Emitting Diode OLED, its negative electrode is electrically coupled to one second voltage VSS.Second voltage VSS is less than the first voltage VDD.
The course of work of the pixel compensation circuit of Fig. 2 will be described in detail below through Fig. 3 A to Fig. 6 A.Wherein, Fig. 3 A illustrates that the pixel compensation circuit working of Fig. 2 lights the view of period in first.Fig. 3 B illustrates that three kinds of control signals of the pixel compensation circuit of Fig. 3 A light the timing waveform of period first.
As shown in Figure 3 A and Figure 3 B, pixel compensation circuit of the present invention is controlled by the combination of the first control signal S1, the second control signal S2 and the 3rd control signal S3.According to the sequential of above-mentioned three kinds of control signals, can periodically be corresponding in turn in one first light period (firstemissionperiod) t1, a reseting period (resetperiod) t2, between an amortization period (compensationperiod) t3 and 1 second light period (secondemissionperiod) t4.
When this circuit working lights period t1 in first, the first control signal S1 is a high level signal, and the second control signal S2 is a high level signal, and the 3rd control signal S3 is a low level signal.Accordingly, the first switch T1, second switch T2, the 3rd switch T3, the 4th switch T4 and the 8th switch T8 are in off state; 5th switch T5, the 6th switch T6 and the 7th switch T7 are all in opening state, thus, first voltage VDD, the 6th switch T6, the 7th switch T7, the 5th switch T5, Organic Light Emitting Diode OLED and the second voltage VSS form a conductive path, and Organic Light Emitting Diode OLED is in illuminating state.
Fig. 4 A illustrates that the pixel compensation circuit working of Fig. 2 is in the view of reseting period.Fig. 4 B illustrates the timing waveform of three kinds of control signals at reseting period of the pixel compensation circuit of Fig. 4 A.
With reference to Fig. 4 A and Fig. 4 B, light after period t1 terminates first, pixel compensation circuit working is at initial reset period t2.Now, the first control signal S1 is low level from high level saltus step, and the second control signal S2 is low level from high level saltus step, and the 3rd control signal S3 is high level from low transition.That is light after period t1 enters reseting period t2 from first, the level state of the first control signal S1, the second control signal S2 and the 3rd control signal S3 all there occurs change.Accordingly, the 6th switch T6 and the 7th switch T7 is all in off state, and the first switch T1, second switch T2, the 3rd switch T3, the 4th switch T4, the 5th switch T5 and the 8th switch T8 are in opening state.
Fig. 5 A illustrates the view of pixel compensation circuit working between the amortization period of Fig. 2.Fig. 5 B illustrates the timing waveform of three kinds of control signals between the amortization period of the pixel compensation circuit of Fig. 5 A.
With reference to Fig. 5 A and Fig. 5 B, after reseting period t2 terminates, pixel compensation circuit working t3 between the amortization period.Now, the first control signal S1 is high level from low transition, and the second control signal S2 keeps low level constant, and the 3rd control signal S3 keeps high level constant.Accordingly, second switch T2, the 6th switch T6 and the 7th switch T7 are all in off state, and the first switch T1, the 3rd switch T3, the 4th switch T4, the 5th switch T5 and the 8th switch T8 are in opening state.
Fig. 6 A illustrates that the pixel compensation circuit working of Fig. 2 lights the view of period in second.Fig. 6 B illustrates that three kinds of control signals of the pixel compensation circuit of Fig. 6 A light the timing waveform of period second.
With reference to Fig. 6 A and Fig. 6 B, after between the amortization period, t3 terminates, pixel compensation circuit working lights period t4 second.Now, the first control signal S1 keeps high level constant, and the second control signal S2 is high level from low transition, and the 3rd control signal S3 is low level from high level saltus step.Accordingly, the first switch T1, second switch T2, the 3rd switch T3, the 4th switch T4 and the 8th switch T8 are in off state; 5th switch T5, the 6th switch T6 and the 7th switch T7 are all in opening state, and the first voltage VDD, the 6th switch T6, the 7th switch T7, the 5th switch T5, Organic Light Emitting Diode OLED and the second voltage VSS form a conductive path, the glow current flowing through Organic Light Emitting Diode OLED can adopt above-mentioned formula to be expressed as:
I＝k×(V
sg-V
th)
2
Can obtain after conversion,
I＝k×(-V
data+V
th+V
ref-V
th)
2
I＝k×(V
ref-V
data)
2
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.When writing identical data (that is, data voltage signal Vdata is identical), even if the different pixels that threshold voltage there occurs drift also can export identical photocurrent.In addition, the present invention arranges two in each operation period and lights period, and utilizes the suitable control strategy of circuit operation, thus significantly can improve the such as Key Performance Indicator such as response time and image retention.
Adopt the pixel compensation circuit of displayer of the present invention, it comprises eight switches, a memory capacitance and an Organic Light Emitting Diode, second end of the first switch is electrically coupled to a reference voltage and control end receives one second control signal, the control end of second switch receives one first control signal and the second end is electrically coupled to an initial voltage, the control end of the 3rd switch receives the second control signal and the second end of the 3rd switch is electrically coupled to the first end of second switch, the control end of the 4th switch receives the second control signal and the first end of the 4th switch is electrically coupled to the second end of the 3rd switch, the control end of the 5th switch is electrically coupled to the first end of the 3rd switch and the second end of the 5th switch is electrically coupled to the second end of the 4th switch, the control end of the 6th switch receives one the 3rd control signal, the second end that first end is electrically coupled to one first voltage and the 6th switch is electrically coupled to the first end of the first switch, the control end of the 7th switch is electrically coupled to the control end of the 6th switch, second end of the second end and the 7th switch that first end is electrically coupled to the 6th switch is electrically coupled to the first end of the 5th switch, the control end of the 8th switch receives the second control signal, the second end that first end is electrically coupled to a data voltage and the 8th switch is electrically coupled to the first end of the 5th switch and the second end of the 7th switch, the first end of first end electric property coupling first switch of memory capacitance and the second end of the 6th switch, second end of memory capacitance is electrically coupled to the first end of the 3rd switch and the control end of the 5th switch, second end of anode electric property coupling the 5th switch of Organic Light Emitting Diode, negative electrode is electrically coupled to one second voltage, and the second voltage is less than the first voltage.Compared to prior art, the present invention is under the condition of limited pixel switch number, arrange two in each operation period and light period, and utilize the suitable control strategy of circuit operation significantly can improve the such as Key Performance Indicator such as response time and image retention, improve the picture quality of organic light emitting diode display.
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 (ActiveMatrixOrganicLightEmittingDiode, AMOLED) display, is characterized in that, described pixel compensation circuit comprises:
One first switch, have a first end, one second end and a control end, the second end of described first switch is electrically coupled to a reference voltage, and the control end of described first switch is in order to receive one second control signal;
One second switch, has a first end, one second end and a control end, and the control end of described second switch is in order to receive one first control signal, and the second end of described second switch is electrically coupled to an initial voltage;
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 second control signal, and the second end of described 3rd switch is electrically coupled to 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 in order to receive described second control signal, and the first end of described 4th switch is electrically coupled to the second end of described 3rd switch;
One the 5th switch, has a first end, one second end and a control end, and the control end of described 5th switch is electrically coupled to the first end of described 3rd switch, and the second end of described 5th switch is electrically coupled to the second end of described 4th switch;
One the 6th switch, there is a first end, one second end and a control end, the control end of described 6th switch is in order to receive one the 3rd control signal, the first end of described 6th switch is electrically coupled to one first voltage, and the second end of described 6th switch is electrically coupled to the first end of described first switch;
One the 7th switch, there is a first end, one second end and a control end, the control end of described 7th switch is electrically coupled to the control end of described 6th switch, the first end of described 7th switch is electrically coupled to the second end of described 6th switch, and the second end of described 7th switch is electrically coupled to the first end of described 5th switch;
One the 8th switch, there is a first end, one second end and one the 3rd end, the control end of described 8th switch is in order to receive described second control signal, the first end of described 8th switch is electrically coupled to a data voltage, and the second end of described 8th switch is electrically coupled to the first end of described 5th switch and the second end of described 7th switch;
One memory capacitance, there is a first end and one second end, the first end of the first switch described in the first end electric property coupling of described memory capacitance and the second end of described 6th switch, the second end of described memory capacitance is electrically coupled to the first end of described 3rd switch and the control end of described 5th switch; And
One Organic Light Emitting Diode, the second end of the 5th switch described in its anode electric property coupling, its negative electrode is electrically coupled to one second voltage, and described second voltage is less than described first voltage.
2. pixel compensation circuit according to claim 1, is characterized in that, described first switch to described 8th switch is a P-type TFT.
3. pixel compensation circuit according to claim 2, is characterized in that, the glow current flowing through described Organic Light Emitting Diode is relevant with described data voltage with described reference voltage, and has nothing to do with the threshold voltage of thin film transistor (TFT).
4. pixel compensation circuit according to claim 1, it is characterized in that, the combination of described first control signal, described second control signal and described 3rd control signal be corresponding in turn in one first light period, a reseting period, between an amortization period and one second light period.
5. pixel compensation circuit according to claim 4, is characterized in that, in described reseting period, described first control signal is a low level signal, and described second control signal is a low level signal, and described 3rd control signal is a high level signal.
6. pixel compensation circuit according to claim 5, is characterized in that, described 6th switch and the 7th switch are all in off state, and described first switch, second switch, the 3rd switch, the 4th switch, the 5th switch and the 8th switch are in opening state.
7. pixel compensation circuit according to claim 5, is characterized in that, between the described amortization period, described first control signal is a high level signal, and described second control signal is a low level signal, and described 3rd control signal is a high level signal.
8. pixel compensation circuit according to claim 7, is characterized in that, described second switch, the 6th switch and the 7th switch are all in off state, and described first switch, the 3rd switch, the 4th switch, the 5th switch and the 8th switch are in opening state.
9. pixel compensation circuit according to claim 7, it is characterized in that, light period and described second described first and light period, described first control signal is a high level signal, described second control signal is a high level signal, and described 3rd control signal is a low level signal.
10. pixel compensation circuit according to claim 9, is characterized in that, light period and described second described first and light period, described first switch, second switch, the 3rd switch, the 4th switch and the 8th switch are in off state.Described 5th switch, the 6th switch and the 7th switch are all in opening state, and described first voltage, the 6th switch, the 7th switch, the 5th switch, Organic Light Emitting Diode and described second voltage form a conductive path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510915220.1A CN105355170A (en) | 2015-12-10 | 2015-12-10 | Pixel compensating circuit for active matrix organic light-emitting diode display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510915220.1A CN105355170A (en) | 2015-12-10 | 2015-12-10 | Pixel compensating circuit for active matrix organic light-emitting diode display |
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| Publication Number | Publication Date |
|---|---|
| CN105355170A true CN105355170A (en) | 2016-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510915220.1A Pending CN105355170A (en) | 2015-12-10 | 2015-12-10 | Pixel compensating circuit for active matrix organic light-emitting diode display |
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| CN108922475A (en) * | 2018-06-08 | 2018-11-30 | 友达光电股份有限公司 | Light emitting diode device and control method thereof |
| CN109712565A (en) * | 2019-03-20 | 2019-05-03 | 京东方科技集团股份有限公司 | A kind of pixel circuit, its driving method and electroluminescence display panel |
| CN110444167A (en) * | 2019-06-28 | 2019-11-12 | 福建华佳彩有限公司 | A kind of AMOLED compensation circuit |
| WO2020211688A1 (en) * | 2019-04-19 | 2020-10-22 | 京东方科技集团股份有限公司 | Pixel drive circuit and method, and display panel |
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| WO2022110247A1 (en) * | 2020-11-30 | 2022-06-02 | 京东方科技集团股份有限公司 | Drive circuit, driving method thereof, and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108922475A (en) * | 2018-06-08 | 2018-11-30 | 友达光电股份有限公司 | Light emitting diode device and control method thereof |
| CN108922475B (en) * | 2018-06-08 | 2021-10-29 | 友达光电股份有限公司 | Light emitting diode device and control method thereof |
| CN109712565A (en) * | 2019-03-20 | 2019-05-03 | 京东方科技集团股份有限公司 | A kind of pixel circuit, its driving method and electroluminescence display panel |
| WO2020186933A1 (en) * | 2019-03-20 | 2020-09-24 | 京东方科技集团股份有限公司 | Pixel circuit, method for driving same, electroluminescent display panel, and display device |
| WO2020211688A1 (en) * | 2019-04-19 | 2020-10-22 | 京东方科技集团股份有限公司 | Pixel drive circuit and method, and display panel |
| WO2020216201A1 (en) * | 2019-04-22 | 2020-10-29 | 京东方科技集团股份有限公司 | Pixel circuit and drive method therefor, display substrate and display apparatus |
| US11244624B2 (en) | 2019-04-22 | 2022-02-08 | Chongqing Boe Optoelectronics Technology Co., Ltd. | Pixel circuit and driving method therefor, display substrate and display device |
| CN110444167A (en) * | 2019-06-28 | 2019-11-12 | 福建华佳彩有限公司 | A kind of AMOLED compensation circuit |
| WO2022110247A1 (en) * | 2020-11-30 | 2022-06-02 | 京东方科技集团股份有限公司 | Drive circuit, driving method thereof, and display device |
| CN112992071A (en) * | 2021-04-22 | 2021-06-18 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof and display device |
| WO2023159503A1 (en) * | 2022-02-25 | 2023-08-31 | 京东方科技集团股份有限公司 | Pixel circuit and driving method, display panel and driving method, and display device |
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