CN110491340A - Micro display pixel arrangement, micro display device and compensation method - Google Patents
Micro display pixel arrangement, micro display device and compensation method Download PDFInfo
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- CN110491340A CN110491340A CN201910679321.1A CN201910679321A CN110491340A CN 110491340 A CN110491340 A CN 110491340A CN 201910679321 A CN201910679321 A CN 201910679321A CN 110491340 A CN110491340 A CN 110491340A
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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
Abstract
The present invention relates to a kind of micro display pixel arrangements, comprising: luminescent device；Driver module is coupled to the luminescent device, is configured to receive scanning signal and data-signal and the driving luminescent device, includes at least the driving transistor for being coupled to the luminescent device；And feedback compensation module, it is coupled to the luminescent device and the driver module, is configured to carry out feedback compensation to the drive module by capacitive coupling, includes at least the first storage capacitance for being coupled to the driving transistor controls pole.The invention further relates to a kind of micro display devices and a kind of compensation method of micro display pixel arrangement.
Description
Technical field
The present invention relates to a kind of circuit, a kind of particularly micro display pixel circuit.
Background technique
Micro display device since its is small in size, it is easy to carry the features such as, become at present display research field a hot spot
Problem.It is very close apart from user's eyes but since micro display device display area is small, in order to reach shown with large-size screen monitors it is same
Etc. resolution ratio, the size of the area of single pixel is just very small in micro display device, only several hundred microns.Therefore in micro display
Storage capacitance in the single pixel circuit of device is also very small, general only in fF rank.Due to switching crystal in pixel circuit
The presence of tube leakage current, so that the voltage change amplitude of storage capacitance can be excessive in a frame time, since luminescent device is being deposited
Storage shines in the case where holding voltage change, therefore the voltage in storage capacitance will affect display panel if variation is excessive
Normal display.Traditional common method is the voltage by extracting the luminescent device such as both ends OLED, is deposited by feedback compensation
Storage hold in charge variation, but do so meeting so that pixel circuit driving transistor generation electric current to a certain extent by
To the influence of luminescent device such as OLED aging.
Summary of the invention
For the technical problems in the prior art, the invention proposes a kind of micro display pixel arrangements to use capacitor coupling
Cooperation is used to compensate the variation of the charge of storage capacitance, and then reduces influence of the transistor drain current to pixel circuit.
Technical solution of the present invention is as follows: a kind of micro display pixel arrangement, comprising: luminescent device；Driver module, coupling
The luminescent device is closed, is configured to receive scanning signal and data-signal and the driving luminescent device, include at least
It is coupled to the first driving transistor of the luminescent device；And feedback compensation module, at least one input terminal and output end
It is all coupled to the control electrode of the first driving transistor, is configured to carry out feedback benefit to the drive module by capacitive coupling
It repays, includes at least the first storage capacitance for being coupled to first driving transistor controls pole.
Particularly, the feedback compensation module further include: the first feedback transistor, the first pole are coupled to the first common electrical
Position, control electrode are coupled to first driving transistor controls pole；First switch transistor, the first pole are coupled to described first
Second pole of feedback transistor, the second pole and control electrode are coupled and are grounded；First storage capacitance is coupled in described first
Between the control electrode of feedback transistor and the second pole.
Particularly, the feedback compensation module further includes second switch transistor, and the first pole is coupled to the first common electrical
Position, control electrode are configured to receive compensating control signal, and the second pole is coupled to first pole of the first feedback transistor.
Particularly, the driver module further include: the first display switch transistor, control electrode are configured to receive and sweep
Signal is retouched, the first pole is configured to receive data-signal；First pole of the driving transistor is coupled to the first common potential,
Control electrode is coupled to the second pole of the first display switch transistor, and the second pole is coupled to the luminescent device anode；And
Second storage capacitance is coupled between the control electrode and the first pole of the first driving transistor.
The invention further relates to a kind of micro display devices, comprising: pixel array, wherein the pixel array includes at least one
Or multiple micro display pixel arrangements as described in claim 1-4；The number of the offer data-signal coupled with the pixel array
According to driving circuit and provide the gate driving circuit of scanning signal；And the sampling compensation circuit coupled with the pixel array,
It is configured to sample the data-signal that the data drive circuit provides and judges whether open for specific data-signal
Move the compensating module in the pixel circuit.
Particularly, the sampling compensation circuit includes: luminescent device；Driver module is coupled to the photophore
Part is configured to receive scanning signal and data-signal and the driving luminescent device；Initial samples module is coupled to described
The driver module in the luminescent device and the sampling compensation circuit in compensation circuit is sampled, is configured to sample a certain grayscale
Corresponding luminescent device driving voltage, and the result sampled is compared with preset threshold, to determine whether to this
Grayscale compensates；And memory module, it is configured to store the judging result of the initial samples module output.
Particularly, the initial samples module includes: third switching transistor, and the first pole is coupled to the first common electrical
Position, control electrode are configured to receive the first initializing signal；4th switching transistor, the first pole are coupled to the luminescent device
Anode, control electrode are configured to receive first initializing signal；5th switching transistor, the first pole are coupled to the hair
Optical device anode, the second pole are coupled to second pole of third switching transistor, and control electrode is configured to receive second initially
Change signal, wherein first and second initializing signal is complimentary to one another or significant level is not overlapped；Third storage capacitance, coupling
It closes between the second pole of ground level and the 4th switching transistor；And hysteresis comparator, the same phase of the hysteresis comparator
End is coupled to the second pole of the 5th switching transistor, and reverse side is coupled to the 4th the second pole of switching transistor, wherein described pre-
It is the corresponding hair of all driver module any two grayscale if threshold value is the window voltage of the hysteresis comparator
Minimum value in the difference of optical device driving voltage；When it is configured to when the hysteresis comparator reverse side voltage and in-phase end voltage
When difference is less than the window voltage, the judging result is not need to compensate for the gray scale；When the hysteresis comparator
When reverse side and in-phase end voltage difference are greater than the window voltage, the judging result is to compensate for gray scale needs.
Particularly, the driver module includes: the second display switch transistor, and control electrode is coupled to scanning letter
Number, data-signal is coupled in the first pole；Second driving transistor, the first pole is coupled to the first common potential, control electrode coupling
It is bonded to the second pole of second display switch transistor, the second pole is coupled to luminescent device anode；4th storage capacitance,
It is coupled between the control electrode and the first pole of the second driving transistor.
Particularly, the sampling compensation circuit further includes sampling feedback compensating module, the sampling feedback compensating module packet
Include: the second feedback transistor, the first pole are coupled to the first common potential, and control electrode is coupled to the 4th switching transistor
Second pole；6th switching transistor, the first pole are coupled to the second pole of second feedback transistor, the second pole and control
Pole couples and is grounded；5th storage capacitance is coupled between the control electrode and the second pole of second feedback switch transistors.
The invention further relates to a kind of compensation methodes of micro display pixel arrangement, comprising: sampling detecting is used for micro display device
The corresponding data-signal of whole grayscale, judge whether each grayscale corresponding data signal needs to compensate, and store the detecting
As a result；Data-signal corresponding with specific grey-scale signal is received under the control of scanning signal；And according to the detecting stored
As a result whether judgement needs to compensate for current data signal, and output phase answers compensating control signal, with control to micro- aobvious
In showing device in pixel array each pixel compensation situation.
Dot structure provided herein and a kind of dynamic is provided using compensation circuit and compensation method accordingly
And targeted compensation mechanism can dynamically judge whether that is needed mends specific pixel for different gray scales
It repays.Compared to the structure for not distinguishing gray scale and not distinguishing concrete condition and carrying out unified compensation, micro display provided herein is set
Standby power consumption is lower.In addition, original vacant area is utilized in pixel circuit to arrange the compensation mould in the design in the application
Block, therefore not will increase the area of original pixel.
Detailed description of the invention
In the following, the preferred embodiment of the present invention will be described in more detail in conjunction with attached drawing, in which:
Fig. 1 is tradition OLED display pixel circuits schematic diagram；
Fig. 2 is according to one embodiment of the present of invention micro display pixel arrangement schematic diagram；
Fig. 3 is according to one embodiment of the present of invention micro display pixel arrangement working timing figure；
Fig. 4 is the simulation result diagram according to one embodiment of the invention micro display pixel arrangement under specific gray scale；
Fig. 5 is the simulation result diagram according to another embodiment of the present invention micro display pixel arrangement under specific gray scale；
Fig. 6 is the sampling compensation circuit schematic diagram according to one embodiment of the invention micro display device；
Fig. 7 is the sampling compensation circuit working timing figure according to one embodiment of the invention micro display device；
Fig. 8 is the architecture diagram according to one embodiment of the invention micro display device；
Fig. 9 is the compensation method flow chart according to one embodiment of the invention micro display device pixel circuit；
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the following detailed description, the specific embodiment for being used to illustrate the application as the application a part may refer to
Each Figure of description.In the accompanying drawings, similar appended drawing reference describes substantially similar component in different drawings.This Shen
Each specific embodiment please has carried out description detailed enough following, so that having the general of ability domain-dependent knowledge and technology
Logical technical staff can implement the technical solution of the application.It should be appreciated that can also be using other embodiments or to the application
Embodiment carry out structure, logic or electrical property change.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the following detailed description, the specific embodiment for being used to illustrate the application as the application a part may refer to
Each Figure of description.In the accompanying drawings, similar appended drawing reference describes substantially similar component in different drawings.This Shen
Each specific embodiment please has carried out description detailed enough following, so that having the general of ability domain-dependent knowledge and technology
Logical technical staff can implement the technical solution of the application.It should be appreciated that can also be using other embodiments or to the application
Embodiment carry out structure, logic or electrical property change.
In the application, transistor can refer to the transistor of any structure, such as field effect transistor (FET) or ambipolar crystalline substance
Body pipe (BJT).When transistor is field effect transistor, control electrode refers to the grid of field effect transistor, and the first pole can be with
Drain electrode or source electrode for field effect transistor, corresponding second extremely can be source electrode or the drain electrode of field effect transistor；Work as crystal
When pipe is bipolar junction transistor, control electrode refers to the base stage of bipolar junction transistor, and first can be extremely bipolar junction transistor
Collector or emitter, corresponding second extremely can be the emitter or collector of bipolar junction transistor.Hysteresis comparator can be with
It is same phase hysteresis comparator or reverse phase hysteresis comparator.Luminescent device can be Organic Light Emitting Diode (OLED), quantum dot
Light emitting diode (QLED), inorganic light-emitting diode (LED) etc..
Fig. 1 is traditional display pixel circuits schematic diagram.
As shown, circuit includes driving transistor 111, display switch transistor 112, storage 113 and shines
Device 114.Scan control signal on scan control signal line SCAN is for controlling display switch transistor 112 to receive data
Data voltage information and storage on signal wire DATA arrive storage 113.When transistor 112 ends, storage
Voltage on 113 will be used to drive driving transistor 111, so that luminescent device 114 shines.However, due to switching transistor 112
There are leakage currents, can impact to the voltage of storage capacitance 113, and then influence the luminous intensity of luminescent device 114.
In view of the above-mentioned problems, the invention proposes a kind of pixel circuits with feedback compensation mechanism.Below with transistor
For p type field effect transistor, luminescent device is described in detail the application for being Organic Light Emitting Diode OLED.It can manage
Solution, in other embodiments, transistor is also possible to bipolar junction transistor, and luminescent device is also possible to quantum dot light emitting two
Pole pipe waits other luminescent devices.
Fig. 2 is one embodiment micro display pixel arrangement schematic diagram according to the present invention.The circuit includes coupled to each other shows
Show drive module 21, feedback compensation module 22 and luminescent device 23.Wherein, feedback compensation module 22 is configurable to according to display
Transistor drain current situation in drive module 21 compensates accordingly.
According to one embodiment, driver module 21 may include driving transistor 211, display switch transistor 212,
First storage capacitance 213.
The the first pole coupled configuration for driving transistor 211 is to receive the first electric potential signal VCC, and the second pole is coupled to photophore
The anode of part 23, control electrode are coupled to the second pole of display switch transistor 212.First pole coupling of display switch transistor 212
It is bonded to data signal line, to receive data voltage Vdata, the control electrode of display switch transistor 212 is coupled to scan signal line,
To receive scanning voltage Vscan.Storage capacitance 213 is coupled between the control electrode and the first pole of driving transistor 211.Photophore
The cathode of part 23 is coupled to second electrode Vcom.According to one embodiment, this Vcom be can according to the demand of luminescence display,
And the low potential that the case where luminescent device changes, wherein Vcom < VCC.
According to one embodiment, feedback compensation module 22 may include switching transistor 221, feedback transistor 222, switch
Transistor 223 and capacitor 224.
First pole of switching transistor 221 is configured to receive high potential signal VCC, and the second pole is coupled to feedback transistor
222 first poles, control electrode are configured to receive compensating control signal Vctrl.According to one embodiment, when needing to drive module 21
When compensating, Vctrl can be on the contrary then keep by system call interception to the level that switching transistor 221 can be made to be connected
In the level for ending transistor 221.The control electrode of feedback transistor 222 is coupled to the control electrode and section of driving transistor 211
Point A, the second pole are coupled to 223 first pole of second switch transistor and node B.Second pole of switching transistor 223 and control electrode
It couples and is grounded, be configured and can be equivalent to a diode, form charging and discharging circuit with capacitor 224.Capacitor 224 is coupled in
Between node A and node B.
Selectable according to another embodiment, wherein switching transistor 223 also can be replaced a constant-current source, with electricity
Hold 224 and form charging and discharging circuit, can equally reach above-mentioned purpose.
Fig. 3 is micro display pixel arrangement working timing figure according to one embodiment of present invention, below with reference to Fig. 2 and Fig. 3
The present invention is described in detail first embodiment working principle.This sentences transistor to be illustrated for PMOS transistor.Certainly, such as
Known to those skilled in the art, the transistor that the present embodiment is is also possible to NMOS tube.
As shown in figure 3, according to one embodiment, in data write phase, when Vscan is low level, switching transistor
212 conductings, the data-signal Vdata with display gray level information are stored in capacitor 213.
Then, in light emitting phase, Vscan jumps to high level, and switching transistor 212 disconnects, and capacitor 213 discharges, driving
Transistor 211 is connected, and luminescent device 23 shines.
According to one embodiment, as shown in figure 3, if system think not need under current gray to drive module 21 into
Vctrl can be then set as such as high level by row compensation, and switching transistor 221 turns off, and feedback compensation module 22 does not work.
It, can if system thinks to need to compensate drive module 21 under current gray according to another embodiment
Vctrl is set as such as low level, switching transistor 221 is connected, and feedback compensation module 22 works.Due to switching transistor
212 electric leakages, when so that the voltage of node A increasing, the control pole tension of feedback transistor 222 is increased, therefore flows through feedback transistor
The current reduction of pipe 222 generates voltage difference between 224 bottom crown of node B and capacitor, therefore so that the voltage of node B declines
The excess charge that capacitor 224 stores is flowed out by switching transistor 223, so that the voltage of 224 bottom crown of capacitor reduces.In turn,
By the capacitive coupling of capacitor 224 and capacitor 213, so that A point voltage declines.
Fig. 4 is the simulation result diagram according to one embodiment of the invention micro display pixel arrangement under specific gray scale, that is, is driven
The simulation result diagram of the control pole tension of dynamic transistor 211 and the electric current for flowing through driving transistor 211.Wherein, the number of present frame
According to voltage (charge stored in capacitor 213) corresponding minimum gray scale, switching transistor 212 is ended, the data-signal of next frame
(voltage to be written received on Vdata data line) corresponds to highest grayscale, can embody crystal to greatest extent in this way
Influence of the tube leakage current to pixel circuit.
Fig. 4 show the pixel circuit according to the application one embodiment by feedback compensation in circuit shown in Fig. 2
Drive transistor 211 in frequency after module 22 compensates and without driving 211 grid voltage of transistor when feedback compensation and flowing through
Rate is the situation of change in a frame image of 60HZ.In Fig. 4, curve 401 represents circuit shown in Fig. 2 not to be had in feedback compensation module 22
There is 211 grid voltage of driving transistor in the case where starting to change with time, curve 402 represents circuit shown in Fig. 2 anti-
211 grid voltage of driving transistor in the case that feedback compensating module 22 starts changes over time, and curve 404 represents shown in Fig. 2
The electric current that flows through luminescent device 23 of the circuit in the case where feedback compensation module 22 does not start changes with time, curve
403, which represent circuit shown in Fig. 2, flows through the change of the electric current of luminescent device 23 at any time in the case where feedback compensation module 22 starts
Change.
It is measured according to experiment, in the state that feedback compensation module 22 does not start, generates electric leakage shadow in switching transistor 212
Loud front and back, drive transistor gate voltage increase 256.815mV, and driving current increases 5989pA.Feedback compensation module 22 opens
In the state of dynamic, before and after switching transistor 212 generates effect of leakage, drive transistor gate voltage increases 18.834mV,
Driving current increases 497.2pA.The case where far below no starting compensating module.
Fig. 5 is the simulation result diagram according to another embodiment of the present invention micro display pixel arrangement under specific gray scale, i.e.,
It drives the control pole tension of transistor 211 and flows through the simulation result diagram of the electric current of driving transistor 211.Wherein, present frame
Data voltage (charge stored in capacitor 213) corresponds to highest grayscale, and switching transistor 212 is ended, the data letter of next frame
Number (voltage to be written received on Vdata data line) corresponding minimum gray scale, so equally can maximum body
Existing influence of the transistor drain current to pixel circuit.
Fig. 5 show the pixel circuit according to the application one embodiment by feedback compensation in circuit shown in Fig. 2
Drive transistor 211 in frequency after module 22 compensates and without driving 211 grid voltage of transistor when feedback compensation and flowing through
Rate is the situation of change in a frame image of 60HZ.In Fig. 5, curve 501 represents circuit shown in Fig. 2 not to be had in feedback compensation module 22
There is 211 grid voltage of driving transistor in the case where starting to change with time, curve 502 represents circuit shown in Fig. 2 anti-
211 grid voltage of driving transistor in the case that feedback compensating module 22 starts changes over time, and curve 504 represents shown in Fig. 2
The electric current that flows through luminescent device 23 of the circuit in the case where feedback compensation module 22 does not start changes with time, curve
503, which represent circuit shown in Fig. 2, flows through the change of the electric current of luminescent device 23 at any time in the case where feedback compensation module 22 starts
Change.
It is measured according to experiment, drives 211 tube grid voltage of crystal to increase 174.714mV, driving current under uncompensated state
Increase 87.49pA.There is drive transistor gate voltage under compensating coefficient to increase 35.599mV, driving current increases 54.66pA.
By Fig. 4, Fig. 5 and emulation data it is found that in the pixel electricity according to the application one embodiment for example, by using PMOS
Lu Zhong, the transistor drain current generated in the circuit shown in Fig. 2, which makes transistor 211 is driven to control pole tension, constantly to be increased, flows
When the electric current of transistor 211 of overdriving constantly reduces, in the case where feedback compensation module 22 starts, driving transistor 211
Control pole tension and the curent change amplitude for flowing through driving transistor 211 are much smaller than the feelings that feedback compensation module 22 does not start
Condition.
So one embodiment according to the present invention can effectively reduce crystal by the feedback compensation to driving transistor 211
Influence of the tube leakage current to luminescent device 23 in pixel circuit, so that the work of pixel circuit is more stable.And feedback compensation electricity
Road directly acts on storage capacitance 213, not will receive light emitting device aging influence.
It is that control pixel circuit by compensating control signal Vctrl anti-as described above, in pixel circuit shown in Fig. 2
Feedback compensating module opens or closes.The realization of compensating control signal Vctrl is described below in detail wherein one there are many method
Kind implementation method and circuit structure.
The present invention also proposes a kind of sampling compensation circuit, for providing accordingly for the pixel array inside micro display device
The compensating control signal of compensating module.The substantially working principle of the sampling compensation circuit is, can be in micro display device initialization
Stage record is used as exemplary pixel circuit required the case where compensating under each display gray scale, and in micro display device
The feedback compensation module in pixel circuit is controlled accordingly according to above-mentioned record when life's work.
Below using transistor as p type field effect transistor, luminescent device be Organic Light Emitting Diode for the application is done
Detailed description.It is understood that in other embodiments, transistor is also possible to bipolar junction transistor, luminescent device
It can be light emitting diode with quantum dots, wait other luminescent devices.
It may include one in the display device using pixel circuit group pixel arrays provided by the embodiment of the present application
A sampling compensation circuit as described above.According to one embodiment, which may include display driving coupled to each other
Module 61, initial samples module 62, storage control module 63 and luminescent device 65.
According to one embodiment, driver module 61 may include driving transistor 611, display switch transistor 612,
Storage capacitance 613.
As shown in fig. 6, the first pole of driving transistor 611 is configured to receive high level signal VCC, the second pole is coupled to
The anode of luminescent device 65, control electrode are coupled to the second pole of display switch transistor 612.Display switch transistor 612
First pole is coupled to data signal line, and to receive datagram Vdata, control electrode is coupled to scan signal line, to receive
Scanning signal Vscan.Storage capacitance 613 is coupled between the control electrode and its first pole of driving transistor 211.Luminescent device 65
Cathode arrangement be receive common potential signal Vcom.According to one embodiment, this Vcom can be according to luminescence display
The low potential that the case where demand and luminescent device changes.
According to one embodiment, initial samples module 62 may include switching transistor 621, switching transistor 622, switch
Transistor 623, hysteresis comparator 624 and storage capacitance 625.So-called hysteresis comparator, when the difference of positive negative input is in size thresholding
Difference or window voltage Vw within the scope of when, keep its output constant, otherwise output switching activity.It can be kept away using hysteresis comparator
It exempt to open compensation function because of small voltage fluctuation, it can be ensured that is just opened there is the case where transistor drain current really
Compensation function.Therefore, the hysteresis comparator with corresponding window voltage can be selected according to the needs of users.
As shown in fig. 6, the first pole of switching transistor 621 is configured to receive high potential signal VCC, the second pole is coupled to
The in-phase end node C of hysteresis comparator 624, control electrode are configured to receive initializing signal voltage ViniA.Switching transistor
622 the first pole is coupled to the second pole of driving transistor 611, and the second pole is coupled to the reverse phase end segment of hysteresis comparator 624
Point D, control electrode are configured to receive initializing signal voltage ViniA.First pole of switching transistor 623 is coupled to driving crystal
Second pole of pipe 611, the second pole are coupled to the in-phase end node C of hysteresis comparator 624, and control electrode is configured to receive initial
Change signal voltage ViniB.
According to one embodiment, as shown in fig. 6, the output end of hysteresis comparator 624 is coupled to storage control module 63
Input terminal.Storage capacitance 625 can be coupled between ground between level and the reverse phase end node D of hysteresis comparator 624, while sluggish ratio
Compared with the input terminal that the reverse phase end node D of device 624 is also coupled to feedback compensation module 64.
According to one embodiment, storage control module 63 may include register 631.As shown in fig. 6, register 631
Input terminal is coupled to the output end of hysteresis comparator 624.According to one embodiment, the output end of register 631 can be with coupling
It is bonded to the feedback compensation module of pixel circuit in micro display device pixel array.(being not shown in Fig. 6)
According to one embodiment, wherein the window voltage value Vw definition of hysteresis comparator 624 is poor as grayscale minimal gradient,
This voltage difference is that (i.e. there is no crystal in the ideal case for the smallest two grayscale of difference each other in all grayscale to be shown
In the case that tube leakage current or transistor drain current do not have an impact) corresponding to luminescent device anode current potential difference.And
Sample luminescence process in, the potential difference of the positive-negative input end of delay comparator be when specific gray scale is presented perfect condition and
There are the differences of the luminescent device anode potential in the case where transistor drain current.
It is poor that window voltage Vw is set as grayscale minimal gradient, is that transistor drain current causes grayscale display wrong in order to prevent
Accidentally.When 624 in-phase end voltage of hysteresis comparator and reverse side difference in voltage are less than 624 window voltage Vw of hysteresis comparator, i.e., |
VD-VC| when < Vw, hysteresis comparator 624 can export such as high level, and 624 output valve Cout=1 of hysteresis comparator is to storage
Module 63 stores the corresponding relationship of its corresponding Cout value of the gray scale；As 624 in-phase end voltage V of hysteresis comparatorCWith reverse phase
Hold voltage VDWhen voltage difference is greater than 624 window voltage Vw of hysteresis comparator, i.e., | VD-VCWhen | >=Vw, hysteresis comparator 624
Output switching activity is such as low level, and 624 output valve Cout=0 of hysteresis comparator stores the gray scale and its phase to memory module 63
The corresponding relationship for the Cout value answered.
It is selectable according to one embodiment, as shown in fig. 6, sampling compensation circuit can also include feedback compensation module
64, for compensating to capacitor 625, avoid wrong sampling.According to one embodiment, which be can have
The circuit structure similar with the feedback compensation module in pixel circuit.For example, the feedback compensation module 64 may include that feedback is brilliant
Body pipe 641, switching transistor 642 and capacitor 643.
The control electrode of feedback transistor 641 is coupled to hysteresis comparator 624 as the input terminal of feedback control module 64
The top crown of anti-phase input end node D and capacitor 625, the first pole are configured to receive high potential signal VCC, the second pole coupling
It is bonded to 642 first pole of switching transistor.Second pole of switching transistor 642 and control electrode are coupled to each other and be grounded jointly, pass through
Configuration can be equivalent to a diode, form discharge loop with capacitor 643.Capacitor 643 is coupled in the control of feedback transistor 641
Between pole processed and the second pole.According to one embodiment, wherein switching transistor 643 also can be replaced a constant-current source, with capacitor
644 form discharge loop, can equally reach above-mentioned purpose.
Fig. 7 is the exemplary operation timing diagram of circuit shown in Fig. 6.VCHysteresis comparator is in-phase end voltage, VDFor sluggish ratio
Compared with device reverse side voltage, Vw is hysteresis comparator window voltage, and Cout is hysteresis comparator output valve.Below with reference to Fig. 6, Fig. 7
The initialization procedure of the display device according to the application one embodiment is described in detail.
Working sequence in Fig. 7 can be divided into pre- jump stage P1, sampling operation stage P2.
(1) stage P1 is jumped in advance
In this stage, Vscan is in low level, and display switch transistor 612 is in the conductive state.Corresponding to specific ash
The data-signal Vdata of rank is written into, and driving transistor 611 is connected.Initializing signal ViniA is in low level, and ViniB is in
High level.Switching transistor 621 and switching transistor 622 are in the conductive state at this time, and switching transistor 623 is in cut-off shape
State.624 in-phase end of hysteresis comparator is configured to receive high level signal VCC at this time.
Due to driving the conducting of transistor 611 at this time soon, so transistor drain current influence can be ignored, therefore sluggish
624 reverse side voltage V of comparatorDIt is considered the corresponding luminescent device anode voltage of the perfect condition specific grey-scale.In
This stage, 624 liang of input terminal voltage differences of hysteresis comparator (threshold voltage for being substantially equal to transistor 611) are less than sluggish ratio
Compared with 624 window voltage of device, i.e., | VC-VD| < Vw.Therefore, it is high level that hysteresis comparator 624, which is configurable to such as output, i.e.,
Output valve Cout=1.
The purpose that the pre- jump stage is arranged is pre-charged to 624 liang of input terminals of hysteresis comparator, and reverse side is charged
It to luminescent device anode voltage ideally and keeps, for being compared use using the stage；Non-inverting input terminal is filled
Electricity arrives high level, to guarantee hysteresis comparator 624 a possibility that sample phase is overturn in time.Otherwise, hysteresis comparator 624
In-phase end can undergo one section of voltage to be increased to the process of luminescent device actual anode voltage from 0V.In in-phase end voltage climbs to hair
In the optical device actual anode voltage pervious most of the time, hysteresis comparator output valve may be 0, i.e., no matter transistor leakage
Whether stream influences greatly to needing to compensate, and the result of the output of hysteresis comparator is to need to compensate.This will lead to compensation
The mistake setting for controlling signal, wastes unnecessary power consumption.High electricity is charged to hysteresis comparator in-phase end in the pre- jump stage
The flat anode virtual voltage that the in-phase end of hysteresis comparator can be made to reach luminescent device faster.
(2) sampling operation stage P2
In this stage, Vscan is in high level, the cut-off of display switch transistor 612.Initializing signal ViniA is jumped
Switch to high level, ViniB jumps as low level.Switching transistor 621 and switching transistor 622 are in off state at this time, open
Transistor 623 is closed to be connected.
According to one embodiment, since switching transistor 622 is in off state, 624 reverse side of hysteresis comparator at this time
Voltage VDIt is provided by capacitor 625, i.e. the anode voltage of current gray luminescent device in the ideal situation, and VDIn feedback compensation mould
It keeps stablizing under the action of block 64.624 in-phase end voltage V of hysteresis comparatorCTo influence abundant situation in transistor drain current
Under current gray luminescent device actual anode voltage.Due to the presence of transistor drain current, V at this momentCV can be lower thanD。
If | VD-VC| < Vw, the output of hysteresis comparator 624 are high level, i.e. Cout=1, this means that current gray
It does not need to compensate.If | VD-VC| >=Vw, the output of hysteresis comparator 624 are low level, i.e. Cout=0, this means that right
Current gray needs compensate.
After sampling to current gray, sample circuit receives the data-signal of corresponding next grayscale, and holds again
Row P1 and P2, until register 631 stores the corresponding Cout value of whole grayscale.
After the completion of initial phase, display device can enter working stage.The control module of display device can basis
Current gray searches the corresponding Cout value stored in storage equipment 63, and using the value as compensating control signal Vctrl in Fig. 2,
Whether started with controlling the compensating module in pixel circuit (such as Cout=Vctrl=1, do not start compensating module；Cout=
Vctrl=0 starts compensating module).
The present invention also proposes a kind of micro display device.Fig. 8 is the frame according to the micro display device of one embodiment of the invention
Composition.As shown in figure 8, micro display device may include data drive circuit 801, gate driving circuit 802, sampling compensation circuit
803 and pixel array 804.
Pixel array 804 includes the multiple display pixel circuits being arranged in rows and columns, and each pixel array includes basis
Pixel circuit provided by the embodiment of the present application.Data drive circuit 801 provides number to pixel array 804 via multiple data lines
According to information of voltage, gate driving circuit 802 provides switching signal to pixel array 804 via multi-strip scanning line, so that picture
Pixel array 804 can issue the light of respective strengths under the control of control circuit 802 based on data voltage information.
Compensation circuit 803 is sampled in micro display device initialization stage work, whole grayscale signals are sampled, is judged
In the corresponding data-signal of these grayscale, which needs or needs not compensate for, and judging result is exported to storage equipment.Initially
After the change stage, micro display device enters working stage, and corresponding value is determined picture according to current gray in storage equipment
The control signal Vctrl of plain circuit compensation module.
Micro display device with above structure can effectively reduce influence of the transistor drain current to pixel circuit, and subtract
The influence process of few transistor drain current is not by light emitting device aging influence.Compensation circuit is sampled in micro display device can control
Whether feedback compensation module is opened in pixel circuit, can effectively reduce circuit power consumption.
The invention also provides a kind of compensation methodes of micro display device pixel circuit introduced by the embodiment of the present application.
Fig. 9 is this method schematic flow chart.
Step 901: sampling detecting is used for the corresponding data-signal of whole grayscale of micro display device, judges each grayscale pair
It answers whether data-signal needs to compensate, and stores the detecting result.
Step 902: data-signal corresponding with specific grey-scale signal is received under the control of scanning signal.
Whether step 903 needs to compensate according to the detecting result judgement stored for current data signal, and defeated
Corresponding compensating control signal out, to control the compensation situation to each pixel in pixel array in micro display device.
Dot structure provided herein and a kind of dynamic is provided using compensation circuit and compensation method accordingly
And targeted compensation mechanism can dynamically judge whether that is needed mends specific pixel for different gray scales
It repays.Compared to the structure for not distinguishing gray scale and not distinguishing concrete condition and carrying out unified compensation, micro display provided herein is set
Standby power consumption is lower.In addition, original vacant area is utilized in pixel circuit to arrange the compensation mould in the design in the application
Block, therefore not will increase the area of original pixel.
Above-described embodiment is used for illustrative purposes only, and is not limitation of the present invention, in relation to the general of technical field
Logical technical staff can also make a variety of changes and modification without departing from the present invention, therefore, all equivalent
Technical solution also should belong to scope disclosed by the invention.
Claims (10)
1. a kind of micro display pixel arrangement, comprising:
Luminescent device；
Driver module is coupled to the luminescent device, is configured to receive scanning signal and data-signal and driving institute
Luminescent device is stated, the first driving transistor for being coupled to the luminescent device is included at least；And
Feedback compensation module, at least one input terminal and output end are all coupled to the control electrode of the first driving transistor,
It is configured to carry out feedback compensation to the drive module by capacitive coupling, includes at least and be coupled to the first driving crystal
First storage capacitance of pipe control electrode.
2. micro display pixel arrangement according to claim 1, wherein the feedback compensation module further include:
First feedback transistor, the first pole are coupled to the first common potential, and control electrode is coupled to the first driving transistor
Control electrode；
First switch transistor, the first pole are coupled to the second pole of first feedback transistor, the second pole and control electrode
It couples and is grounded；
First storage capacitance is coupled between the control electrode and the second pole of first feedback transistor.
3. micro display pixel arrangement according to claim 2, wherein the feedback compensation module further includes second switch crystalline substance
Body pipe, the first pole are coupled to the first common potential, and control electrode is configured to receive compensating control signal, and the second pole is coupled to
First feedback transistor, first pole.
4. the apparatus according to claim 1, wherein the driver module further include:
First display switch transistor, control electrode are configured to receive scanning signal, and the first pole is configured to receive data-signal；
First pole of the driving transistor is coupled to the first common potential, and it is brilliant that control electrode is coupled to first display switch
The second pole of body pipe, the second pole are coupled to the luminescent device anode；And
Second storage capacitance is coupled between the control electrode and the first pole of the first driving transistor.
5. a kind of micro display device, comprising:
Pixel array, wherein the pixel array includes at least one or more micro display pixel as described in claim 1-4
Device；
The data drive circuit of the offer data-signal coupled with the pixel array and the gate driving for providing scanning signal are electric
Road；And
The sampling compensation circuit coupled with the pixel array, be configured to the data drive circuit provide data-signal into
Row samples and judges whether start the compensating module in the pixel circuit for specific data-signal.
6. device according to claim 5, wherein the sampling compensation circuit includes:
Luminescent device；
Driver module is coupled to the luminescent device, is configured to receive scanning signal and data-signal and driving institute
State luminescent device；
Initial samples module is coupled to aobvious in the luminescent device in the sampling compensation circuit and the sampling compensation circuit
Show drive module, be configured to sample the corresponding luminescent device driving voltage of a certain grayscale, and by the result sampled and default threshold
Value is compared, to determine whether to compensate the grayscale；And
Memory module is configured to store the judging result of the initial samples module output.
7. device according to claim 5, wherein the initial samples module includes:
Third switching transistor, the first pole are coupled to the first common potential, and control electrode is configured to receive the first initialization letter
Number；
4th switching transistor, the first pole are coupled to the luminescent device anode, and control electrode is configured to receive described first
Initializing signal；
5th switching transistor, the first pole are coupled to the luminescent device anode, and the second pole is coupled to the third switch
The second pole of transistor, control electrode be configured to receive the second initializing signal, wherein first and second initializing signal that
This complementary or significant level is not overlapped；
Third storage capacitance is coupled between ground between the second pole of level and the 4th switching transistor；And
Hysteresis comparator, the in-phase end of the hysteresis comparator are coupled to the second pole of the 5th switching transistor, reverse side coupling
It is bonded to the 4th the second pole of switching transistor, wherein the preset threshold is the window voltage of the hysteresis comparator, it is all
Minimum value in the difference of the corresponding luminescent device driving voltage of the driver module any two grayscale；
It is described when it is configured to when the hysteresis comparator reverse side voltage and in-phase end voltage difference are less than the window voltage
Judging result is not need to compensate for the gray scale；When the hysteresis comparator reverse side and in-phase end voltage difference are greater than institute
When stating window voltage, the judging result is to compensate for gray scale needs.
8. device according to claim 5, wherein the driver module includes:
Second display switch transistor, control electrode are coupled to scanning signal, and data-signal is coupled in the first pole；
Second driving transistor, the first pole are coupled to the first common potential, and control electrode is coupled to second display switch
The second pole of transistor, the second pole are coupled to luminescent device anode；
4th storage capacitance is coupled between the control electrode and the first pole of the second driving transistor.
9. device according to claim 5, wherein the sampling compensation circuit further includes sampling feedback compensating module, it is described to adopt
Sample feedback compensation module includes:
Second feedback transistor, the first pole are coupled to the first common potential, and control electrode is coupled to the 4th switch crystal
The second pole of pipe；
6th switching transistor, the first pole are coupled to the second pole of second feedback transistor, the second pole and control electrode
It couples and is grounded；
5th storage capacitance is coupled between the control electrode and the second pole of second feedback switch transistors.
10. a kind of compensation method of micro display pixel arrangement, comprising:
Sampling detecting is used for the corresponding data-signal of whole grayscale of micro display device, judges that each grayscale corresponding data signal is
It is no to need to compensate, and store the detecting result；
Data-signal corresponding with specific grey-scale signal is received under the control of scanning signal；And
Whether need to compensate for current data signal according to the detecting result judgement stored, and output phase should compensate control
Signal processed, to control the compensation situation to each pixel in pixel array in micro display device.
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