CN102542991A - Column scanning driving method and platform for display screen - Google Patents
Column scanning driving method and platform for display screen Download PDFInfo
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- CN102542991A CN102542991A CN2012100488406A CN201210048840A CN102542991A CN 102542991 A CN102542991 A CN 102542991A CN 2012100488406 A CN2012100488406 A CN 2012100488406A CN 201210048840 A CN201210048840 A CN 201210048840A CN 102542991 A CN102542991 A CN 102542991A
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Abstract
The invention discloses a column scanning driving method and a platform for a display screen, The driving method particularly comprises the following steps: the column scanning line signals of the display screen are subjected to block processing; and the column signals subjected to the block processing are outputted to column scanning lines. According to the column scanning driving method and a platform provided by the invention, through selecting the sub-block number, the number driving I/O and the data clock period, the optimal balance among the I/O number, the I/O output data speed and the block conversion speed is achieved, thereby meeting the display requirements of the display screen; and after the screen is subjected to the block processing, the time-sharing multiplexing for the pin is realized, and only one block is driven at a time, thereby reducing the number of the required pins. The column scanning driving method and the platform for the display screen provided by the invention can greatly reduce the pins of scanning driving signals output by a programmable chip, can maintain the flexibility of the scanning driving, and can effectively support the development of the high-performance display screen.
Description
Technical field
The invention belongs to the display driver technical field, be specifically related to the design of a kind of display screen arrange scanning drive method and platform.
Background technology
OLED (Organic Light-Emitting Diode) display screen is regarded as the novel planar display technique of tool potentiality of future generation, and it has possessed the incomparable advantage of many LCD.
One of core technology that actuation techniques shows as OLED be the key of successfully developing high-performance OLED, and the design of special-purpose drive IC often lags behind the exploitation of display screen far away, and expense is higher, becomes the factor of restriction OLED producer development.Therefore developing the designing technique of OLED drives platform and oneself grasp platform, for research OLED actuation techniques provides software and hardware to support, is one of prerequisite core competence of open OLED.
Following elder generation does an explanation to the OLED driving principle: show the same with the LCD plane; Image is delivered to the OLED screen by one one and is shown; For avoiding the display frame flicker, image must keep certain frequency, carries out (as shown in Figure 1) synchronously with synchronizing signal between field and field.To every field pattern image source, view data is sent to display screen by delegation of delegation, the row with in the ranks carry out synchronously with synchronizing signal.To every row figure image source, with regard to OLED, be expert at synchronously effectively after, sweep signal is (OLED basic pixel cell as shown in Figure 2) effectively, transistor T 1 conducting among Fig. 2, this makes the state of T2 determined by data line voltage.Capacitor C s makes that behind the end of scan electric capacity was accomplished the state after discharging and recharging when the T2 state remained on scanning.The structure of OLED pixel cell has determined that in every line scanning stage view data need all be sent to data line.After data line showed completion, the scanning of then carrying out next line showed, until the demonstration of accomplishing a field data.
By on can know that want driving OLED normally to show, control module must be accomplished the scanning to all OLED pixel columns in a field time, and in scan period, sees corresponding data off, with control display unit GTG.Therefore the driving of the OLED task of will accomplishing, the one, the sequential of gated sweep signal and data-signal, the one, generate driving OLED and show required voltage.The former is accomplished by digital circuit usually, and the latter is accomplished by mimic channel usually.
The driving voltage of OLED is generally about 10V; Data-signal and sweep signal are digital signal; And the voltage of digital signal is generally about 3V, so data-signal and sweep signal must pass through digital-to-analog conversion and level conversion, can show by the driving OLED display unit.OLED is driven task, after OLED screen maturation, can be accomplished by special chip, chip is the digital-to-analogue hybrid chip.But be in the exploitation OLED display screen stage, chip development lags behind, so numerical portion needs to be accomplished by programmable chip such as FPGA; Analog part adopts DC-DC to accomplish (programmable chip is as shown in Figure 3 with being connected of OLED screen) with D/A and some other mimic channels usually.Because control OLED scan lines displayed and data line are along with its amount of raising of screen resolution is very huge; Therefore after digital-to-analog circuit separated, its requirement to the programmable chip interface was very big, is 320X240 AMOLED display screen like resolution; 320 sweep traces are arranged, 720 data lines.If display unit has 256 gray scale variation; Be 8 by programmable chip to the data-signal of the D/A of every data lines output then, promptly 8 programmable chip pins drive a data lines, add the scanning pin; Drive this AMOLED screen; Required pin able to programme will reach 6080, and number of pins is more, realize complicated.Therefore, realize the driving of OLED display screen, must change driving method and platform, reduce driving required interface pin.
Summary of the invention
The objective of the invention is to drive the problems referred to above that exist, proposed a kind of display screen arrange scanning drive method in order to solve existing OLED display screen.
Technical scheme of the present invention is: a kind of display screen arrange scanning drive method is specially: the column scan line signal to display screen carries out the piecemeal processing, and the column signal after piecemeal is handled outputs to the column scan line; It is that be t the sweep time of establishing delegation, and data line is divided into n piece that said piecemeal is handled detailed process; Each piece gating time is identical, is t/n, and establishing has the m data lines in each piece; Every data lines is driven by x output I/O mouth, and total driving I/O mouth number is y; The pixel clock frequency of display image is f
p, the data output frequency of I/O mouth is f, the inversion frequency of piece is f
c, said x, y, f
p, f
c, m, n and f satisfy following relation:
Wherein, c representes the data line that display screen is total, c, f in the formula (1)
p, f
cConfirm that by the attribute of the attribute of display screen display image and piece m is confirmed in through type (1), (3), (4) with t in advance, n and f can confirm the size of piece and the data output frequency of I/O mouth.
Further, said display screen is specially the OLED screen.
Further, specifically realize for described by the D/A conversion.
Further, the described concrete level conversion of passing through realizes.
In order to address the above problem, the invention allows for a kind of display screen arrange turntable driving platform, comprising: control module and piece processing unit, said control module is seen the column data signal off to the piece processing unit one by one under clock control; The number of said processing unit is n, in each piece processing unit the m data lines is arranged, and every data lines is driven by x output I/O mouth, and total driving I/O mouth number is y; The pixel clock frequency of display image is f
p, the frequency of clock is f, the inversion frequency of piece processing unit is f
c, said x, y, f
p, f
c, m, n and f satisfy following relation:
Wherein, c representes the data line that display screen is total, c, f in the formula (1)
p, f
cConfirm that by the attribute of the attribute of display screen display image and piece processing unit m is confirmed in through type (1), (3), (4) with t in advance, n and f can confirm the size of processing unit and the frequency f of clock.
Further, said processing unit is specially: the D/A converting unit.
Further, said processing unit is specially: level conversion unit.
As a kind of preferred version, said screen column scan drives platform also comprises digit translation unit and analogy decode unit, and said control module is used for scanning output signal is encoded; Said digit translation unit is to carrying out digit translation one time through encoded signals; The digital signal of said analogy decode unit after to digit translation carried out an analogy decode, and the sweep signal of the analogy decode output of analogy decode unit directly is sent to the horizontal scanning line of display screen.
Beneficial effect of the present invention: display screen arrange scanning drive method of the present invention and platform make the I/O number through selecting piecemeal number, the number that drives I/O and data clock cycle; The I/O output data rate; The switching rate of piece reaches optimum balance, can satisfy display screen and show required requirement; After will shielding the piecemeal processing, realized pin time-sharing multiplexing, only drive a piece a moment, thereby reduced the number of required pin.Display screen arrange scanning drive method of the present invention and platform can reduce the pin of programmable chip output scanning drive signal greatly, can keep the dirigibility of turntable driving again simultaneously, thereby the exploitation of support high-performance display screen that can be strong.
Figure of description
Fig. 1 is a plane displaying principle synoptic diagram.
Fig. 2 is basic active OLED pixel cell synoptic diagram.
Fig. 3 is existing programmable chip and the synoptic diagram that is connected of OLED screen.
Fig. 4 is the structural representation of display screen arrange turntable driving platform of the present invention.
Fig. 5 is column scan drives platform design 1 among the embodiment.
Fig. 6 is column scan drives platform design 2 among the embodiment.
Fig. 7 is that the embodiment midrange is according to the piecemeal synoptic diagram.
Fig. 8 is that the design of AMOLED320x240 drives platform realizes among the embodiment.
Fig. 9 is a digit translation synoptic diagram during the 320x240x3AOLED line scanning drives among the embodiment.
Embodiment
Below in conjunction with accompanying drawing and concrete embodiment the present invention is done further elaboration.
Display screen arrange scanning drive method of the present invention is specially: the column scan line signal to display screen carries out the piecemeal processing, and the column signal after piecemeal is handled outputs to the column scan line; It is that be t the sweep time of establishing delegation, and data line is divided into n piece that said piecemeal is handled detailed process; Each piece gating time is identical, is t/n, and establishing has the m data lines in each piece; Every data lines is driven by x output I/O mouth, and total driving I/O mouth number is y; The pixel clock frequency of display image is f
p, the data output frequency of I/O mouth is f, the inversion frequency of piece is f
c, said x, y, f
p, f
c, m, n and f satisfy following relation:
Wherein, c representes the data line that display screen is total, c, f in the formula (1)
p, f
cConfirm that by the attribute of the attribute of display screen display image and piece m is confirmed in through type (1), (3), (4) with t in advance, n and f can confirm the size of piece and the data output frequency of I/O mouth.
Display driver of the present invention belongs to line production; Therefore the view data total amount that the coding control chip receives in the unit interval equates with the data total amount on outputing to screen, promptly requires
Here, specifically realize that by the D/A conversion perhaps level conversion realizes for described.
Described display screen is specially the OLED screen.Those skilled in the art will appreciate that the display screen arrange scanning drive method here also can be used for the driving of other display screen.
Based on above-mentioned column scan driving method, the invention allows for a kind of display screen arrange turntable driving platform, as shown in Figure 4, comprising: control module and piece processing unit, said control module is seen the column data signal off to the piece processing unit one by one under clock control; The number of said processing unit is n, in each piece processing unit the m data lines is arranged, and every data lines is driven by x output I/O mouth, and total driving I/O mouth number is y; The pixel clock frequency of display image is f
p, the frequency of clock is f, the inversion frequency of piece processing unit is f
c, said x, y, f
p, f
c, m, n and f satisfy following relation:
Wherein, c representes the data line that display screen is total, c, f in the formula (1)
p, f
cConfirm that by the attribute of the attribute of display screen display image and piece processing unit m is confirmed in through type (1), (3), (4) with t in advance, n and f can confirm the size of processing unit and the frequency f of clock.Data are by clock control, and the frequency of clock is f, and the frequency f of the clock here is: the data output frequency of I/O mouth.
Here, the piece processing unit is specially: D/A converting unit (shown in the design platform 1 of Fig. 5), perhaps level conversion unit (shown in the design platform 2 of Fig. 6).
As a kind of preferred version, as shown in Figure 4, said screen column scan drives platform also comprises digit translation unit and analogy decode unit, and said control module is used for scanning output signal is encoded; Said digit translation unit is to carrying out digit translation one time through encoded signals; The digital signal of said analogy decode unit after to digit translation carried out an analogy decode, and the sweep signal of the analogy decode output of analogy decode unit directly is sent to the horizontal scanning line of display screen.
In preferred version, the line scanning of drives platform drives through coding, decoding, the driving to display screen is accomplished in decoding again, can flexibly and effectively realize arbitrary dimension is driven arbitrarily the turntable driving of the display screen of requirement.Control module is specifically realized through programmable chip.Programmable chip configuration circuit and SDRAM are the peripheral circuit of programmable chip, at first in programmable chip, scanning output signal are encoded, and dwindle the pin of programmable chip to scanning output; To carrying out digit translation one time through encoded signals, again digital signal is carried out an analogy decode afterwards then, the sweep signal of analogy decode output directly is sent to OLED screen sweep trace, thereby accomplishes the turntable driving to the OLED screen.
The digit translation unit can be accomplished by programmable chip; The analogy decode unit can select to simulate MUX such as ADG506A accomplishes; If analogy decode unit output voltage can not satisfy the demand of OLED voltage, then can behind the analogy decode unit, increase level-conversion circuit.
As shown in Figure 5, programmable chip 1 realizes that OLED screen ranks drive sequential, and line scanning drives employing coding---decoding---realization of decoding again, and the row of this platform drives and all adopts this thought to realize.Drive difference for row, Fig. 5, two kinds of different designs of Fig. 6 can be arranged according to display mode.
As shown in Figure 5; The column scan data line is carried out piecemeal; Whole sweep time the inner control unit see video data off to each piece one by one; But only send video data to a piece at the synchronization control chip, the number of pins that therefore links to each other with control module is merely the required number of pins of data line that drives a piece, adopts this piecemeal method of driving just can reduce control module and drives output pin.Yet thought according to string and conversion; This operation certainly will improve control module I/O mouth output data speed, if but the data output speed is too fast, and the speed of digital-to-analog conversion or level conversion then possibly not catch up with in the piece (block); So size of piece; Must satisfy certain measuring, can confirm this and measure through following relational expression.
As shown in Figure 7, be t the sweep time of establishing delegation, and data line is divided into several pieces, and each piece gating time is identical; Be t/n, wherein, n is the piecemeal number; If the m data lines is arranged in each piece, every data lines is driven by x output I/O mouth, and total driving I/O mouth number is y; The display image pixel clock frequency is f
p, the data output frequency of control chip I/O mouth is f, digital-to-analogue or level conversion frequency are f in the piece
c, then platform is wanted operate as normal, must satisfy following relation:
Wherein, c representes the data line that display screen is total in the formula (1), is constant.f
pAfter screen resolution and frame frequency are definite, can confirm f
c, digital-to-analogue or level conversion device also can confirm that frame frequency confirms that back per horizontal-scanning interval of t also promptly confirms after confirming.Therefore by m only in the formula, n and f are unknown, and through formula (1), (3), (4), 3 relational expressions are just in time confirmed m, and n and f can confirm the block size of suitable platform work and I/O mouth data output frequency.
For instance, show that as accomplishing the 320*3*240 image its frame frequency is 60HZ, then can roughly calculate pixel clock is about 5M, is roughly 15.67us the sweep time of delegation.Through the above-mentioned relation formula, can get
Be mf
c>=46.1M>=15M, get final product mf
c>=46.1M accomplishes digital-to-analog conversion as adopting AD8600, and its switching rate can reach 12.5M, then m more than or equal to 4 can satisfy platform requirement.
To design platform 1 (as shown in Figure 5); Its display mode is to control the GTG of display unit with voltage swing, and therefore every OLED data line needs to be driven by the programmable chip I/O of some; As to realize 256 GTGs; Then need 8 I/O mouths to drive, x=8 in the promptly above-mentioned formula, this moment, y was 8 multiple.In the platform programmable chip the sequential that will accomplish: scanning OLED display line, in the every row of scanning, each BLOCK of gating sees data simultaneously off successively, through the row of D/A conversion rear drive display screen, its GTG is determined by the voltage behind D/A.
Design platform 2 (as shown in Figure 6), its display mode are the GTGs of controlling display unit with the length that shows the time.Such display mode, its x=1, promptly an I/O drives an OLED data line.For realizing the gray scale variation of display unit, need a video data is divided into several sub-field, the duration of every sub-field is different, as realizing 256 GTGs, then needs the son field of 8 various durations.In every sub-field, programmable chip all will carry out single pass to OLED and drive, in scan period; Programmable chip drives to column scan and only sees two states off, and " 1 " is " 0 " perhaps, equally in the every row of scanning; Each BLOCK of gating successively; See data simultaneously off,, make the OLED display unit show perhaps and do not show through level conversion rear drive OLED data line.Two kinds of its display effects of platform are identical, and just programmable I/O the mouth of platform 2 needs is less, but need programmable chip that more complicated rank scanning control timing is arranged.
For the 320X240X3AMOLED display screen is an example, realize to will the image of 60HZ frame frequency speed being shown that with resolution the data clock that needs (pixel clock 3 times) is probably about 15M.The programmable chip of platform is all selected the FPGA XC3S1000-4fg456 of XILINX company, and FPGA accomplishes ranks and drives sequential control, and line scanning is encoded, and the control analog-digital chip.
As shown in Figure 8; Selection platform 1 is realized and is selected for use AD8600 to carry out digital-to-analog conversion; This is the analog-digital chip that 8 bit digital are imported the output of 16 tunnels analogies, and therefore will realize needs 45 such chips altogether to the driving of this screen, and the high conversion rate of AD8600 can reach 12.5M.According to the analysis of front, select m=4 can satisfy the platform requirement, but because 45 AD8600 chips are arranged; For the ease of dividing into groups, select m=5 here, promptly FPGA once drives 5 data lines; The number that is I/O is 40, then can AD8600 be divided into 9 groups, every group of 5 AD8600 chips.Behind one group of digital-to-analogue chip of FPGA gating, each the time clockwise 5 data lines see data off, behind 16 clocks, accomplish the gating of one group of digital-to-analogue chip, then next group of gating finishes up to demonstration.At this moment, I/O mouth data output frequency is 9.2M, and the I/O number that is used to be listed as driving is 40, compares with the I/O numbers that 720 row of original needs drive, and has obviously reduced a lot.
Display screen line drives explanation as follows: fpga chip 1 is accomplished ranks and is driven sequential; And to line scan signals coding output signal a [7:0], b [7:0], c [4:0], in fpga chip 2, according to the demand of analogy decode circuit; Completion is to the decoding of signal a, b, c, and its decoding block diagram is as shown in Figure 9.The signal of chip 2 outputs is sent to 20 ADG506A and carries out final 320 tunnel turntable driving that form of analogy decode, thereby accomplishes the driving to this screen.
Platform 2 is accomplished similar to driving and the platform 1 of 320X240X3AMOLED, no longer is elaborated.
Can drive 320X240X3AMOLED through this column scan drives platform of checking.When the display resolution raising, the upgrading of this drives platform also is easy to, and brings up to 1024X768 like resolution, has 2304 road column data lines, needs with 144 AD8600.According to formula
Can get mf
c>=147M, the AD8600 switching rate can reach 12.5M, then m more than or equal to 12 can satisfy platform requirement, the number of required I/O is 96 when m=12, this moment, I/O mouth data output frequency was 12.3M.Select the XILINX FPGA of company programmable chip XC3S1000, have much 391 user I/O most, this is enough to satisfy the demands.Software through to programmable chip is made an amendment slightly, and circuit is set type again and can be realized upgrading, and is much easier more than the exploitation chip.Column scan drives platform of the present invention is owing to the use separation circuit is realized, so circuit is bigger, can be used as exploitation OLED and shields use when verifying, will be no longer suitable after OLED screen maturation.
Those of ordinary skill in the art will appreciate that embodiment described here is in order to help reader understanding's principle of the present invention, should to be understood that protection scope of the present invention is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not break away from essence of the present invention according to these teachings disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (10)
1. display screen arrange scanning drive method is specially: the column scan line signal of display screen is carried out piecemeal handle, the column signal after piecemeal is handled outputs to the column scan line; It is that be t the sweep time of establishing delegation, and data line is divided into n piece that said piecemeal is handled detailed process; Each piece gating time is identical, is t/n, and establishing has the m data lines in each piece; Every data lines is driven by x output I/O mouth, and total driving I/O mouth number is y; The pixel clock frequency of display image is f
p, the data output frequency of I/O mouth is f, the inversion frequency of piece is f
c, said x, y, f
p, f
c, m, n and f satisfy following relation:
Wherein, c representes the data line that display screen is total, c, f in the formula (1)
p, f
cConfirm that by the attribute of the attribute of display screen display image and piece m is confirmed in through type (1), (3), (4) with t in advance, n and f can confirm the size of piece and the data output frequency of I/O mouth.
2. column scan driving method according to claim 1 is characterized in that, described display screen is specially the OLED screen.
3. column scan driving method according to claim 1 and 2 is characterized in that, described concrete through D/A conversion realization.
4. column scan driving method according to claim 1 and 2 is characterized in that, described concrete through the level conversion realization.
5. display screen arrange turntable driving platform comprises: control module and piece processing unit, and said control module is seen the column data signal off to the piece processing unit one by one under clock control; The number of said processing unit is n, in each piece processing unit the m data lines is arranged, and every data lines is driven by x output I/O mouth, and total driving I/O mouth number is y; The pixel clock frequency of display image is f
p, the frequency of clock is f, the inversion frequency of piece processing unit is f
c, said x, y, f
p, f
c, m, n and f satisfy following relation:
Wherein, c representes the data line that display screen is total, c, f in the formula (1)
p, f
cConfirm that by the attribute of the attribute of display screen display image and piece processing unit m is confirmed in through type (1), (3), (4) with t in advance, n and f can confirm the size of processing unit and the frequency f of clock.
6. column scan drives platform according to claim 5 is characterized in that, described display screen is specially the OLED screen.
7. according to claim 5 or 6 described column scan drives platform, it is characterized in that said processing unit is specially: the D/A converting unit.
8. according to claim 5 or 6 described column scan drives platform, it is characterized in that said processing unit is specially: level conversion unit.
9. according to claim 5 or 6 described column scan drives platform, it is characterized in that said screen column scan drives platform also comprises digit translation unit and analogy decode unit, said control module is used for scanning output signal is encoded; Said digit translation unit is to carrying out digit translation one time through encoded signals; The digital signal of said analogy decode unit after to digit translation carried out an analogy decode, and the sweep signal of the analogy decode output of analogy decode unit directly is sent to the horizontal scanning line of display screen.
10. column scan drives platform according to claim 9 is characterized in that, described digit translation unit realizes through programmable chip that specifically described analogy decode unit is specifically realized through ADG506A.
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