CN107845361A - One sub-pixel drive circuit and global display methods - Google Patents
One sub-pixel drive circuit and global display methods Download PDFInfo
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- CN107845361A CN107845361A CN201711305274.1A CN201711305274A CN107845361A CN 107845361 A CN107845361 A CN 107845361A CN 201711305274 A CN201711305274 A CN 201711305274A CN 107845361 A CN107845361 A CN 107845361A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- 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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a sub-pixel drive circuit and global display methods, gray value is switched into analog voltage and is loaded into sub-pixel unit by progressive scan or interlacing scan, using the first electric capacity, second electric capacity is respectively used to scanning voltage and driving is shown, and global display is carried out after a two field picture is scanned through using sub-pixel voltage grey decision-making corresponding with the sub-pixel there is linear relationship to realize global display, before driving sub-pixel to show simultaneously, the threshold voltage of driving tube need to be captured, saturation region is operated in for it to eliminate threshold voltage, reach the purpose of compensation, show image relatively sharp.
Description
Technical field
It is complete more particularly, to a sub-pixel drive circuit and one kind the present invention relates to a kind of drive circuit and display methods
Office's display methods.
Background technology
Existing display device mainly has：OLED/LED display devices, QLED display devices, Micro-OLED/LED are shown
Equipment etc. is several, and it is made up of pel array, and each pixel includes several sub-pixels, common are RGB system and RGBW
System.In RGB system, each pixel includes a red sub-pixel, a green sub-pixels, a blue subpixels；RGBW
In system, each pixel includes a red sub-pixel, a green sub-pixels, a blue subpixels and a sub- picture of white
Element.The brightness of effective control each sub-pixel of pixel cell and the color for realizing required display.
Typical OLED/LED sub-pixel units drive circuit carries out image by the way of a line is scanned, light a line and shown
Show.OLED/LED brightness and the size of current for being carried in its both ends are in certain relation, and OLED/LED electricity is flowed through by control
Size is flowed to realize the display of different brightness.
Analog voltage and the relation of gray scale such as Fig. 1 that DAC is converted to.Door drive control module chooses pel array
Certain a line, video data is obtained into analog voltage Vdt by DAC module, is loaded onto the energy storage of Fig. 2 sub-pixel unit drive circuits
In first electric capacity C1, and light the row.Treat that all rows are all scanned, the complete image of a width is just shown.Progressive scan
Or interlacing scan and the display control method lighted ensure that the lighting time of each pixel is the time of a frame, but in scanning extremely
During certain a line of this frame, the pel array corresponding to data not loaded in this frame still maintains the data of display previous frame,
There is the data image that a part is this frame in entire image, and a part is the phenomenon of the data image of previous frame, and this is not institute
Expect the image seen.
The content of the invention
In order to solve the problems, such as in background technology in the presence of existing display device, the application first purpose in this exists
In a kind of sub-pixel drive circuit for being used in display device drive the shinny display of specific sub-pixel in pixel cell of offer, the electricity
Road has two-level memory function, and image to be displayed scanning process and display device driving sub-pixel are shown into process independently separates,
And there is compensation function, avoid a secondary entire image from the data image that a part is this frame occur, a part is previous frame
The phenomenon of data image.
The application second purpose in this is in the simulation electricity stored in a kind of drive circuit using sub-pixel is provided
Pressure grey decision-making corresponding with the sub-pixel is linear to realize that single sub-pixel is shown, so as to realize global display.This method
Effectively solved the problems, such as in background technology in the presence of existing display device while realizing global display,.
It is active matrix driving in the sub-pixel drive circuit that this is provided, it includes to realize the first object of the present invention：
First switch, for the analog voltage corresponding to institute's image to be displayed sub-pixel gray value to be introduced into circuit；
First electric capacity, for storing by the introduced analog voltage of first switch, and pass through stored analog voltage to second
Electric capacity charges；
Second electric capacity, for storing the analog voltage on the first electric capacity；
3rd electric capacity：For partial pressure；
Second switch, for connecting and turning off the first electric capacity and the second electric capacity and the first electric capacity and driving tube；It is stored in first
Analog voltage on electric capacity is charged through second switch to the second electric capacity, the second electric capacity driving driving tube；
Driving tube, for driving sub-pixel to show；
3rd switch, for discharging institute's residue analog voltage on the second electric capacity；The first switch, second switch and the 3rd open
Pass is disposed as PMOS, NMOS tube or transmission gate.
The first electric capacity and the second electric capacity in above-mentioned sub-pixel drive circuit can be to the valid data (warps of image to be displayed
The video data for the image to be displayed that surface sweeping obtains, after gamma is changed, the gamma voltages of formation) (charging) is stored,
And (electric discharge) valid data driving driving tube can be discharged and start and drive connected sub-pixel to show.Coordinate for scanning
The display of image then can be achieved in the frame time base of each sub-pixel gray value in image to be displayed.Electricity is driven using the sub-pixel
Each sub-pixel in road driving display device, the problem of can efficiently solving appeared in existing display.In addition, pass through design
The unnecessary data of second electric capacity (voltage) can be discharged (electric discharge) by second switch, avoid also leaving a sub- picture on the second electric capacity
The data of element, make the drive signal of drive circuit output provided by the present invention more accurate, can be fully solved in existing display
Institute's produced problem.In addition, in order that the image of display is relatively sharp, it is electric to increase the 3rd to be connected with the second electric capacity for foregoing circuit
Hold, realize that partial pressure compensates.
Further, in addition to the 4th switch for cutting off, connecting circuit power is formed.
Further, in addition to the 5th switch for discharging residual voltage is formed, and the 5th switch plays stable institute
State the effect of voltage between driving tube and sub-pixel.
Further, first electric capacity and the second electric capacity have identical charge characteristic.Both loading data be ensure that
Correctness, it in turn ensure that the enough discharge and recharge time.
To realize second object of the present invention, in a kind of global display methods that this is provided, this method utilizes sub- picture
The analog voltage stored in plain drive circuit grey decision-making corresponding with the sub-pixel is linear to realize that single sub-pixel shows
Show, driven in display device by sub-pixel drive circuit and shown with the sub-pixel corresponding to image to be displayed sub-pixel,
Form global display；Wherein used sub-pixel drive circuit is any sub-pixel driving electricity provided herein
Road；Comprise the following steps that：
Step 1：Scanning voltage, control unit to image to be displayed or video by carrying out line by line or interlacing scan, acquisition are treated
The gray value of each sub-pixel in display image；By the grayvalue transition of acquisition into corresponding analog voltage, in a frame significant figure
First switch is closed temporarily according to next, during the analog voltage of scanning is stored in；
Step 2：Unnecessary electricity is discharged, the charging of the first electric capacity finishes, and disconnects first switch, passes through the switch of Clr signals control the 3rd
Electricity unnecessary on the second electric capacity is bled off, ensures to be loaded onto the accuracy of the voltage of each sub-pixel unit drive circuit；
Step 3：Compensation；
Step 4：Driving display, after releasing the second electric capacity electricity, second switch is closed, is filled from the first electric capacity to the second electric capacity
Electricity, and drive driving tube to make it drive sub-pixel to show, the complete and correct image of a width is shown, treats the first electric capacity to the second electricity
Capacity charge finishes, and disconnects second switch, shows and prepares for next frame；
Step 5：Persistent loop step 1~step 4.
This method successively stores to each sub-pixel gray value in image to be displayed, waits each sub-pixel in image to be displayed
Gray value all in the form of analog voltage after, the analog voltage of a upper sub-pixel remaining in sub-pixel drive circuit is discharged,
Sub-pixel corresponding to driving again is shown, and also circuit is compensated during release voltage, solves traditional display methods
In the presence of the problem of.
Specifically, the compensation specific method in the step 3 is as follows：
SA1：Release voltage, during low-voltage, the voltage at the second electric capacity of release, the 3rd electric capacity and the intersecting node of driving tube；
SA2：Control source, during high voltage, input voltage at the node that intersects to the second electric capacity, the 3rd electric capacity and driving tube, grab
Take the threshold voltage of driving tube.
Specifically, the compensation specific method in the step 3 is as follows：
SA1：Control source, during high voltage, input voltage at the node that intersects to the second electric capacity, the 3rd electric capacity and driving tube；
SA2：Release voltage, the voltage at the intersecting node of the second electric capacity, the 3rd electric capacity and driving tube is discharged, capture the threshold value of driving tube
Voltage.
The beneficial effect of sub-pixel drive circuit provided by the present invention and global display methods is：Driving circuit structure
Simply, display methods is simple, and it is this frame to solve the secondary entire image in the presence of traditional display methods and a part occur
Data image, a part is the phenomenon of the data image of previous frame.By the threshold value electricity that driving tube is captured during display
Pressure, after crawl, realizes and driving tube is eliminated threshold voltage in its saturation region, reach the purpose of compensation, shown beneficial to image,
Show image relatively sharp.
Brief description of the drawings
Fig. 1 is the relation of analog voltage and sub-pixel gray value；
Fig. 2 is a kind of common OLED/LED pixel unit drive circuit schematic diagrams；
Fig. 3 is the first described in the present invention with balanced sub-pixel driver circuit schematic diagram；
Fig. 4 is the timing diagram of the first sub-pixel drive circuit；
Fig. 5 is another timing diagram of the first sub-pixel drive circuit；
Fig. 6 is second described in the present invention with balanced sub-pixel driver circuit schematic diagram；
Fig. 7 is the timing diagram of second seed pixel-driving circuit；
Fig. 8 be the present invention described in the third with balanced sub-pixel driver circuit schematic diagram；
Fig. 9 is the timing diagram of the third sub-pixel drive circuit；
Figure 10 is the 4th kind described in the present invention with balanced sub-pixel driver circuit schematic diagram；
Figure 11 is the timing diagram sequence of the 4th sub-pixel drive circuit；
Figure 12 is capacitor charge and discharge performance diagram；
Figure 13 is the control signal figure of sub-pixel drive circuit provided by the present invention；
Figure 14 is the global displaying principle described in the present invention.
Embodiment
Make herein with reference to accompanying drawing and specific driving circuit structure claimed technical schemes all to the present invention further
Explanation.
The application sub-pixel drive circuit claimed includes：
First switch S1, for the analog voltage corresponding to institute's image to be displayed sub-pixel gray value to be introduced into circuit；
First electric capacity C1, for store by analog voltage introduced first switch S1, and pass through stored analog voltage to
Second electric capacity C2 charges and driving driving tube M1；
Second electric capacity C2, for storing the analog voltage on the first electric capacity C1；
3rd electric capacity C3：For partial pressure；
Second switch S2, for connecting the first electric capacity C1 and the second electric capacity C2 and the first electric capacity C1 and driving tube M1, it is stored in
Analog voltage on first electric capacity C1 is charged through second switch S2 to the second electric capacity C2 and the second electric capacity C2 driving driving tubes
M1；
Driving tube M1, for driving sub-pixel to show；
3rd switch S3, for discharging institute's residue analog voltage on the second electric capacity C2.
The first switch S1, second switch S2 and the 3rd switch S3 are disposed as PMOS, NMOS tube or transmission gate.
In addition, the circuit further comprises the 4th switch S4 for cutting off, connecting circuit power, and/or for stablizing
The 5th switch S5 for stating voltage between driving tube M1 and sub-pixel is formed, and the 4th switch S4 and the 5th switch S5 are disposed as
PMOS, NMOS tube or transmission gate.
As long as the circuit for meeting above-mentioned function is the application technical scheme claimed, the application gives herein
The concrete structure of several drive circuits, circuit structure are as follows：
The first drive circuit include first switch S1, second switch S2, the 3rd switch S3, the first electric capacity C1, the second electric capacity C2,
Driving tube M1 and the 3rd electric capacity C3, its circuit theory diagrams are as shown in Figure 3.Simulated as valid data first switch S1 one end
Voltage Vdt (analog voltage signal after gamma conversions) input, for receiving the simulation electricity corresponding to sub-pixel gray value
Pressure；The other end is connected with the first electric capacity C1 one end and second switch S2 one end.First electric capacity C1 another termination circuit
Reference voltage Vref, the second switch S2 other end are connected to reference voltage Vref by the 3rd switch S3 respectively and passed sequentially through
Second electric capacity C2 and the 3rd electric capacity C3 are connected to reference voltage Vref, operating voltage Vdd or common ground Vss, and are connected to
Driving tube M1 grid；Driving tube M1 power end is connected to operating voltage Vdd, output of the other end as whole drive circuit
End, for connecting sub-pixel (luminescent device：LED or OLED).
The circuit structure coordinate sub-pixel scanning circuit (being used to scan each sub-pixel gray value in image to be displayed) and
Digital analog converter (being used to be easy to be stored in sub-pixel drive circuit into analog voltage by sub-pixel grayvalue transition) is i.e.
Specific sub-pixel can be driven to show gray value corresponding in its corresponding sub-pixel drive circuit and realize display.
The working method of the circuit structure has two kinds, and course of work difference is as follows：
The control sequential of the first working method as shown in figure 4, and control signal then as shown at 13.Changed when through digital analog converter
During rear analog voltage input circuit, first switch S1 is closed, the analog voltage with sub-pixel gray value linearly is deposited
Enter in the first electric capacity C1, when each sub-pixel drive circuit has received the sub-pixel gray value that need to be shown, disconnect first switch S1；
After being stored in analog voltage in the drive circuit of each sub-pixel Deng each sub-pixel gray value in image to be displayed, start the
Three switch S3 discharge voltage remaining in the second electric capacity C2, during the second electric capacity C2 discharges residual voltage, drag down operating voltage
Vdd, now Vdd voltage is loaded at the second electric capacity C2 and a sequence of intersection point O points of the 3rd electric capacity C3 phases, whole process continues T1
After time, operating voltage Vdd is returned into high voltage, and carried out to the first electric capacity C1 and the second electric capacity C2 intersection point by Vdd
(the threshold voltage vt h) of driving tube is captured in charging process after the charging T2 times；The T3 periods, closure second switch S2, first
The voltage stored in electric capacity C1 is charged by second switch S2 to the second electric capacity C2 (will be stored in the first electric capacity C1
Effective gamma be transferred in the second electric capacity C2) and drive all sub-pixel units to show the complete and correct image of a width.
Treat that C1 finishes to C2 chargings, disconnect second switch S2, show and prepare for next frame.The T4 periods, start driving tube M1, make it
Sub-pixel (luminescent device of the drive connection in driving tube M1 output ends：LED or OLED) luminescence display.
The control sequential of second of working method is as shown in figure 5, and control signal is then as shown in figure 13.This working method with
The first working method is essentially identical, and existing difference is：In the T3 periods, when operating voltage Vdd is low-voltage, closure
Second switch S2, the voltage transfer for making to be stored in the first electric capacity C1 is into the second electric capacity C2, after the completion of data transfer, in T4
Between section operating voltage Vdd is reverted into high voltage, driving tube M1 driving sub-pixels are shown.
As shown in fig. 6, second of drive circuit includes first switch S1, second switch S2, the 3rd switch S3, the first electric capacity
C1, the second electric capacity C2, driving tube M1, the switch S4 of the 3rd electric capacity C3 and the 4th, its circuit theory diagrams are as shown in Figure 5.First switch
S1 one end is as valid data analog voltage Vdt (analog voltage signal after gamma conversions) input, for receiving sub- picture
Analog voltage corresponding to plain gray value；The other end is connected with the first electric capacity C1 one end and second switch S2 one end.First
The reference voltage Vref of electric capacity C1 another termination circuit, the second switch S2 other end are connected to by the 3rd switch S3 respectively
Reference voltage Vref, and pass sequentially through the second electric capacity C2 and the 3rd electric capacity C3 is connected to reference voltage Vref, operating voltage Vdd
Or common ground Vss, second switch S2 one end are additionally coupled to driving tube M1 grid；Driving tube M1 power end passes through the 4th
Switch S4 is connected to operating voltage Vdd, output end of the other end as whole drive circuit, for connecting sub-pixel (photophore
Part：LED or OLED).
The control sequential of the circuit is as shown in fig. 7, and control signal is then as shown in figure 13.Changed when having through digital analog converter
During rear analog voltage input circuit, first switch S1 is closed, the analog voltage with sub-pixel gray value linearly is deposited
Enter in the first electric capacity C1, when each sub-pixel drive circuit has received the sub-pixel gray value that need to be shown, disconnect first switch S1；
After being stored in analog voltage in the drive circuit of each sub-pixel Deng each sub-pixel gray value in image to be displayed, start the
Three switch S3 discharge voltage remaining in the second electric capacity C2, during the second electric capacity C2 discharges residual voltage, drag down operating voltage
Vdd, now Vdd voltage is loaded at the second electric capacity C2 and a sequence of point of intersection point 0 of the 3rd electric capacity C3 phases, whole process continues T1
After time, operating voltage Vdd is returned into high voltage, and (grabbed after carrying out the charging T2 times to 0 point by Vdd in charging process
Take driving tube M1 valve voltage)；T3 periods, Em signals disconnect the 4th switch S4, closure second switch S2；First electric capacity C1
Middle stored voltage is charged by second switch S2 to the second electric capacity C2 (will be stored in effective in the first electric capacity C1
Gray value is transferred in the second electric capacity C2) and drive all sub-pixel units to show the complete and correct image of a width.Treat C1 to
C2 chargings finish, and disconnect second switch S2, show and prepare for next frame.After the completion of to be charged, Em signals control closure the 4th
Control source driving tube M1 on switch S4, the second electric capacity C2, starts driving tube M1, is driving its drive connection within the T4 times
Sub-pixel (luminescent device in dynamic pipe M1 output ends：LED or OLED) luminescence display.
As shown in figure 8, the third drive circuit includes first switch S1, second switch S2, the 3rd switch S3, the first electric capacity
C1, the second electric capacity C2, driving tube M1, the 3rd electric capacity C3, the 4th switch S4 and the 5th switch S5, its circuit theory diagrams such as Fig. 7 institutes
Show.First switch S1 one end as valid data analog voltage Vdt (gamma conversion after analog voltage signal) input,
For receiving the analog voltage corresponding to sub-pixel gray value；The one of the other end and the first electric capacity C1 one end and second switch S2
End connection.The reference voltage Vref of first electric capacity C1 another termination circuit, the second switch S2 other end pass through the 3rd respectively
Switch S3 is connected to reference voltage Vref, passes sequentially through the second electric capacity C2 and the 3rd electric capacity C3 is connected to reference voltage Vref, work
Make voltage Vdd or common ground Vss, and be connected to driving tube M1 grid；Driving tube M1 power end passes through the 4th switch
S4 is connected to operating voltage Vdd, output end of the other end as whole drive circuit, for connecting sub-pixel (luminescent device：
LED or OLED), the 5th switch S5 is connected between driving tube M1 output end and reference voltage Vref.
The control sequential of the circuit is as shown in figure 9, and control signal is then as shown in figure 13.Changed when having through digital analog converter
During rear analog voltage input circuit, first switch S1 is closed, the analog voltage with sub-pixel gray value linearly is deposited
Enter in the first electric capacity C1, when each sub-pixel drive circuit has received the sub-pixel gray value that need to be shown, disconnect first switch S1；
After being stored in analog voltage in the drive circuit of each sub-pixel Deng each sub-pixel gray value in image to be displayed, start the
Three switch S3 discharge voltage remaining in the second electric capacity C2, during the second electric capacity C2 discharges residual voltage, the switch of closure the 4th
At S4, the intersection point A that Vdd voltage is loaded on to the second electric capacity C2, the 3rd electric capacity C3 and the 4th switch S4, after continuing the T1 times, break
The 4th switch S4 is opened, the switch S5 of closure the 5th, is discharged by A points to reference voltage, crawl driving tube M1 threshold voltage vt h,
Continue the T2 times；T3 periods, Em disconnect the 4th switch S4, completely cut off Vdd, are deposited in closure second switch S2, the first electric capacity C1
The voltage of storage is charged by second switch S2 to the second electric capacity C2 (will be stored in the effective gamma in the first electric capacity C1
It is transferred in the second electric capacity C2) and drive all sub-pixel units to show the complete and correct image of a width.Treat that C1 charges to C2
Finish, disconnect second switch S2, show and prepare for next frame.On Em signals control closure the 4th switch S4, the second electric capacity C2
Control source driving tube M1, start driving tube M1, make its son of the drive connection in driving tube M1 output ends within the T4 times
Pixel (luminescent device：LED or OLED) luminescence display.
As shown in Figure 10, the 4th kind of drive circuit includes first switch S1, second switch S2, the 3rd switch S3, the first electricity
Hold C1, the second electric capacity C2, driving tube M1, the switch S4 of the 3rd electric capacity C3 and the 4th, its circuit theory diagrams is as shown in Figure 9.First
S1 one end is switched as valid data analog voltage Vdt (analog voltage signal after gamma conversions) input, for receiving
Analog voltage corresponding to sub-pixel gray value；The other end is connected with the first electric capacity C1 one end and second switch S2 one end.
The reference voltage Vref of first electric capacity C1 another termination circuit, the second switch S2 other end are connected by the 3rd switch S3 respectively
Reference voltage Vref is connected to, the second electric capacity C2 is passed sequentially through and the 3rd electric capacity C3 is connected to reference voltage Vref, operating voltage Vdd
Or common ground Vss, and it is connected to driving tube M1 grid；Driving tube M1 power end is connected to work by the 4th switch S4
Make voltage Vdd, output end of the other end as whole drive circuit, for connecting sub-pixel (luminescent device：LED or OLED).
The control sequential of the circuit is as shown in figure 11, and control signal is then as shown in figure 13.Turn when having through digital analog converter
During analog voltage input circuit after changing, first switch S1 is closed, by the analog voltage with sub-pixel gray value linearly
It is stored in the first electric capacity C1, when each sub-pixel drive circuit has received the sub-pixel gray value that need to be shown, disconnects first switch
S1；After being stored in analog voltage in the drive circuit of each sub-pixel Deng each sub-pixel gray value in image to be displayed, open
Dynamic 3rd switch S3 discharges voltage remaining in the second electric capacity C2, during the second electric capacity C2 discharges residual voltage, closure the 4th
S4 is switched, at the intersection point A that Vdd voltage is loaded on to the second electric capacity C2, the 3rd electric capacity C3 and the 4th switch S4, continues the T1 times
Afterwards, the 4th switch S4 is disconnected, Vref discharges to power supply by A points, crawl driving tube M1 threshold voltage vt h, when continuing T2
Between.The T3 periods, the voltage stored in closure second switch S2, the first electric capacity C1 is by second switch S2 to the second electric capacity C2
Charged (effective gamma that will be stored in the first electric capacity C1 is transferred in the second electric capacity C2) and drive all sub- pictures
Plain unit shows the complete and correct image of a width.After after T3 time charging completes, Em signals control closure the 4th switchs S4,
Control source driving tube M1 on second electric capacity C2, start driving tube M1, make its within the T4 times drive connection in driving tube M1
Sub-pixel (luminescent device in output end：LED or OLED) luminescence display.
In four kinds of circuit structures of the above, first switch S1, second switch S2, the 3rd switch S3, the 4th switch S4, the 5th open
Close S5 and be disposed as PMOS, NMOS tube or transmission gate；First switch S1, second switch S2, the 3rd switch S3, the 4th switch
S4, the 5th switch S5 grid connect with control signal n-signal, G/S signal, ini signals, Em signals and C signal respectively, and first
Switch S1, second switch S2, the 3rd switch S3, the 4th switch S4, the 5th switch S5 control signal are respectively n-signal, GS letters
Number, ini signals, Em signals and C signal, be the conducting and cut-off of controllable switch by above-mentioned signal, wherein, reference voltage
Vref, C signal, ini signals are all that and G/S signal, EM signals are produced by external circuit caused by outside IC DC parts, GS letters
Number and Em signals be with the pulse width of signal or G/S signal be less than Em signals pulse width.Several specific sequential of signal
Such as Fig. 4, Fig. 5, shown in Fig. 7, Fig. 9 and Figure 11.
Driving tube M1 can be used and is arranged to PMOS or NMOS tube.
The first electric capacity C1 described in the present invention and electric capacity or different qualities that the second electric capacity C2 can be identical characteristic
Electric capacity.First electric capacity C1 was determined by the charge characteristic of two electric capacity to the second electric capacity C2 times charged.Its charge-discharge characteristic is such as
Shown in Figure 12, electric capacity charges to a certain voltage or by the time △ t of a certain tension discharge to 0 and the capacitance C and electricity of electric capacity by 0
The resistance R on road is relevant.
Data on sub-pixel are more accurate in order to ensure to load on, the first electric capacity C1 for being used in the embodiment of the present application,
Second electric capacity C2 has the electric capacity of identical characteristic.Using identical characteristic except ensure that data accuracy, enough fill in turn ensure that
Discharge time, and now the analog voltage to be charged to the first electric capacity C1 should be 2 times of traditional approach drive circuit (Fig. 2) or
Slightly larger than 2 times.
In order to ensure that the voltage on the second electric capacity C2 can discharge totally, between controlling before and after the 3rd Clr signals for switching S3
It is abundant every that should set.
Above drive circuit combination control unit is that the control that sub-pixel is shown can be achieved, the control that drive circuit is exported
Control signal is as shown in figure 13.Global displaying principle such as Figure 14 institutes of the application global display driver circuit claimed
Show.
In addition, the global displaying principle of the application global display methods claimed is as shown in figure 13, this method profit
Single son is realized with the analog voltage stored in sub-pixel drive circuit grey decision-making corresponding with the sub-pixel is linear
Pixel is shown, is driven in display device by sub-pixel drive circuit and is carried out with the sub-pixel corresponding to image to be displayed sub-pixel
It has been shown that, form global display；Any sub-pixel driving is electric in four kinds for more than for wherein used sub-pixel drive circuit
Road；Comprise the following steps that：
Step 1：Scanning voltage, control unit to image to be displayed or video by carrying out line by line or interlacing scan, acquisition are treated
The gray value of each sub-pixel in display image；By the grayvalue transition of acquisition into corresponding analog voltage, in a frame significant figure
According to first switch S1 is closed temporarily, the analog voltage of scanning is stored in C1；
Step 2：Unnecessary electricity is discharged, the first electric capacity C1 chargings are finished, and disconnect first switch S1, and the 3rd is controlled by Clr signals
Switch S3 bleeds off electricity unnecessary on the second electric capacity C2, ensures to be loaded onto the accurate of the voltage of each sub-pixel unit drive circuit
Property；
Step 3：Compensation
Step 4：Driving display, after releasing the second electric capacity C2 electricity, second switch S2 is closed, it is electric from the first electric capacity C1 to second
Hold C2 chargings, and drive driving tube M1 to make it drive sub-pixel to show, show the complete and correct image of a width, treat the first electric capacity
C1 finishes to the second electric capacity C2 chargings, disconnects second switch S2, shows and prepares for next frame；
Step 5：Persistent loop step 1~step 4.
Wherein, the compensation specific method in step 3 has following two modes：
The first：
SA1：Release voltage, during low-voltage, the electricity at the second electric capacity C2 of release, the 3rd electric capacity C3 and the intersecting nodes of driving tube M1
Pressure；
SA2：Control source, during high voltage, electricity is inputted at the node that intersects to the second electric capacity C2, the 3rd electric capacity C3 and driving tube M1
Pressure, crawl driving tube M1 threshold voltage vt h.
Second：
SA1：Control source, during high voltage, electricity is inputted at the node that intersects to the second electric capacity C2, the 3rd electric capacity C3 and driving tube M1
Pressure；
SA2：Release voltage, the voltage at node that the second electric capacity C2 of release, the 3rd electric capacity C3 and driving tube M1 intersect, crawl are driven
Dynamic pipe M1 threshold voltage vt h.
Charge characteristics of the first electric capacity C1 to the time that the second electric capacity C2 charges by two electric capacity in above overall situation display methods
Determine.
Sub-pixel drive circuit provided herein and global display methods are applied to OLED/LED, QLED, Micro-
The self light emittings such as OLED/LED and equipment.
In addition, described in the application：Recover high voltage again after dragging down Vdd, two power supplys two can be used to switch, one
Switch closure is just low, and another switch closure is just high.
In addition, the application before driving sub-pixel is shown, need to capture driving tube M1 threshold voltage vt h, it is to be full at it
Threshold voltage vt h is eliminated with area, shows image relatively sharp.
The reference voltage of described Vref indication circuits in the embodiment of the present invention；N-signal, G/S signal control
First switch S1 and S2 unlatching and closure, Clr are clock signal, for controlling the 3rd switch S3 conducting；Vsync represents field
Synchronizing signal, above-mentioned signal introduces after being produced by external circuit (such as outside DC) invents provided circuit use.
The above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, those of ordinary skill in the art are to this hair
The modification or equivalent substitution that bright technical scheme is made, without departing from the spirit and scope of technical scheme, contain
Cover in scope of the presently claimed invention.
Claims (10)
- A 1. sub-pixel drive circuit, it is characterised in that：The circuit is active matrix driving, and it includes：First switch, for the analog voltage corresponding to institute's image to be displayed sub-pixel gray value to be introduced into circuit；First electric capacity, for storing by the introduced analog voltage of first switch, and pass through stored analog voltage to second Electric capacity charges；Second electric capacity, for storing the analog voltage on the first electric capacity；3rd electric capacity：For partial pressure；Second switch, for connecting and turning off the first electric capacity and the second electric capacity and the first electric capacity and driving tube；It is stored in first Analog voltage on electric capacity is charged through second switch to the second electric capacity, the second electric capacity driving driving tube；Driving tube, for driving sub-pixel to show；3rd switch, for discharging institute's residue analog voltage on the second electric capacity；The first switch, second switch and the 3rd switch are arranged to PMOS, NMOS tube or transmission gate.
- 2. sub-pixel drive circuit according to claim 1, it is characterised in that：The sub-pixel drive circuit knot Structure：One end of first switch connects as analog voltage input, one end of one end and second switch of the other end and the first electric capacity Connect；The other end connection reference voltage of first electric capacity, the other end of second switch are connected to reference to electricity by the 3rd switch respectively The second electric capacity and the 3rd capacitance connection are pressed and passed sequentially through to reference voltage, operating voltage or common ground, and is connected to drive The grid of dynamic pipe；The power end of driving tube is connected to operating voltage, and the other end connects hair as the output end of whole drive circuit Optical device.
- 3. sub-pixel drive circuit according to claim 1, it is characterised in that：Also include being used to cut off, connect electricity 4th switch of road power supply is formed.
- 4. the sub-pixel drive circuit according to claim 1 or 3, it is characterised in that：Also include being used for described in stabilization The 5th switch of voltage is formed between driving tube and sub-pixel.
- 5. the sub-pixel drive circuit according to claim 1-4 any one, it is characterised in that：First electric capacity There is identical charge characteristic with the second electric capacity.
- 6. sub-pixel drive circuit according to claim 1, it is characterised in that：The driving tube is arranged to PMOS Or NMOS tube.
- A kind of 7. global display methods of such as any one of a claim 1-6 sub-pixel drive circuit, it is characterised in that：Should Method utilizes the analog voltage linear realization of grey decision-making corresponding with the sub-pixel stored in sub-pixel drive circuit Single sub-pixel shows, by sub-pixel drive circuit drive in display device with the sub- picture corresponding to image to be displayed sub-pixel Element is shown, forms global display.
- 8. global display methods according to claim 7, it is characterised in that：Comprise the following steps that：Step 1：Scanning voltage, control unit to image to be displayed or video by carrying out line by line or interlacing scan, acquisition are treated The gray value of each sub-pixel in display image；By the grayvalue transition of acquisition into corresponding analog voltage, in a frame significant figure According to first switch is closed temporarily, the analog voltage of scanning is stored in the first electric capacity；Step 2：Unnecessary electricity is discharged, the charging of the first electric capacity finishes, and disconnects first switch, passes through the switch of Clr signals control the 3rd Electricity unnecessary on the second electric capacity is bled off, ensures to be loaded onto the accuracy of the voltage of each sub-pixel unit drive circuit；Step 3：Compensation；Step 4：Driving display, after releasing the second electric capacity electricity, second switch is closed, is filled from the first electric capacity to the second electric capacity Electricity, and drive driving tube to make it drive sub-pixel to show, the complete and correct image of a width is shown, treats the first electric capacity to the second electricity Capacity charge finishes, and disconnects second switch, shows and prepares for next frame；Step 5：Persistent loop step 1~step 4.
- A kind of 9. global display methods according to claim 8, it is characterised in that：Compensation in the step 3 is specifically square Method is as follows：SA1：Release voltage, during low-voltage, the voltage at the second electric capacity of release, the 3rd electric capacity and the intersecting node of driving tube；SA2：Control source, during high voltage, input voltage at the node that intersects to the second electric capacity, the 3rd electric capacity and driving tube, grab Take the threshold voltage of driving tube.
- A kind of 10. global display methods according to claim 8, it is characterised in that：Compensation in the step 3 is specifically square Method is as follows：SA1：Control source, during high voltage, input voltage at the node that intersects to the second electric capacity, the 3rd electric capacity and driving tube；SA2：Release voltage, the voltage at node that the second electric capacity of release, the 3rd electric capacity and driving tube intersect, captures driving tube Threshold voltage.
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| CN201711305274.1A CN107845361B (en) | 2017-12-11 | 2017-12-11 | Sub-pixel driving circuit and global display method |
| PCT/CN2018/079547 WO2019114140A1 (en) | 2017-12-11 | 2018-03-20 | Global display method and driving circuit |
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