CN104485070A - Driving control device and method for scanning LED display screen - Google Patents
Driving control device and method for scanning LED display screen Download PDFInfo
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- CN104485070A CN104485070A CN201410782144.7A CN201410782144A CN104485070A CN 104485070 A CN104485070 A CN 104485070A CN 201410782144 A CN201410782144 A CN 201410782144A CN 104485070 A CN104485070 A CN 104485070A
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Abstract
The invention relates to a driving control device and a driving control method for scanning an LED display screen. The driving control device is suitable for being used in M scanning LED display screens and comprises a sub field part arranging module and a sub field part achieving order arranging module, wherein the sub field part arranging module is used for arranging and partitioning practical total sub field numbers necessary for achieving each gray level corresponding to a plurality of gray level data into N sub field parts, and used for adding N virtual scanning sub fields; the sub field part achieving order arranging module is used for confirming the achieving order of the N sub field parts corresponding to achievement of each gray level corresponding to the gray level data, and N virtual scanning sub fields, wherein a preset mode comprises a mode that a virtual scanning sub field is firstly achieved before each round of M scanning, and the gray level data in the virtual scanning sub fields are identical to those of sub fields corresponding to each scanning of one same round of scanning. Through the adoption of the driving control device and method, the problem that in the prior art the first scanning is slightly dark when a low gray level image is displayed is solved.
Description
Technical field
The present invention relates to display technique field, particularly display control technology field, particularly relate to a kind of driving control device and the method that scan LED display.
Background technology
Tradition adopts the scanning LED display of on-off formula driving chip can see that first sweeps partially dark problem when showing low gray scale picture, and LED display number of scans increases or refresh rate rising can aggravate this problem.The Crack cause of this problem is as follows:
The gray scale display of current scanline LED display is realized by subfield, and each subfield sends certain 1bit (position) of gradation data, and the output channel opening time then by controlling driving chip realizes weight corresponding to this bit.Generally for the refresh rate improving scanning LED display, it is not the gray scale realizing next line after the gray scale realizing certain a line complete again, but total for the reality realized needed for complete gray scale subfield number is divided into many parts, such as total for the reality realized needed for gray scale subfield number is divided into 8 parts, scanning LED display 8 to be swept, and characterizes first sweep with A, and B characterizes second and sweeps,, H characterizes the 8th and sweeps.
The conventional drived control mode of scanning LED display as shown in Figure 1, be specially: first allow often sweep realizing the first subfield part A1 successively, B1, C1, D1, E1, F1, G1, H1, allow again often sweep and realize the second subfield part A2 successively, B2, C2, D2, E2, F2, G2, H2, until all subfield part A1-A8, B1-B8, C1-C8, D1-D8, E1-E8, F1-F8, G1-G8, H1-H8 is often swept realization, and then circulation allows often sweep and realizes the first subfield part A1 successively, B1, C1, D1, E1, F1, G1, H1, the like.
Refer to Fig. 2, it is the 8 partial structurtes schematic diagram sweeping LED display.In fig. 2,8 LED of the same alignment in scanning LED display regional area are connected to the same output channel such as OUT1 of driving chip, there is stray capacitance Cp in this public alignment, this driving chip determines the output of each output channel such as OUT1 according to the output channel enable signal OE of input and view data over the ground.For output channel OUT1, when output channel OUT1 opens, alignment is low level, when output channel OUT1 closes, LED is equivalent to a larger resistance, slowly charged to the stray capacitance Cp on this alignment by LED during line is in effective status (being such as in noble potential), cause column line voltage to raise.In addition, because low greyscale image data only has some low bit data to be 1, high bit data are 0, and low bit data scatter realizes to each subfield part but is not that each subfield part will realize this bit data.The view data shown such as is needed to only have bit3 to be 1 and bit3 realizes in the first subfield part, during the follow-up second to the 8th subfield part realizes, because other bit data are 0, the output channel OUT1 of driving chip can not open, longer during this period of time, continue through LED during line A-H is in effective status to charge to alignment stray capacitance Cp, the electric charge that alignment stray capacitance Cp stores is caused to increase, when the runic A1 in Fig. 1 realizes this bit3, output channel OUT1 opens, electric charge on alignment stray capacitance Cp causes output waveform to be out of shape (as shown in Figure 3), the actual ON time of LED reduces, when closed, this factor impact very is in short-term larger, and runic B1 is in FIG when realizing this bit3, output channel OUT1 conducting during owing to just realizing A1, alignment stray capacitance Cp discharges, spurious charge greatly reduces, therefore, when B1 realizes this bit3, spurious charge impact is very little, output waveform distortion is very little, because the LED on this reason line B is brighter than the LED on line A when low gray scale shows, in like manner, LED on other lines C-H is also bright than the LED on line A, occur when also namely showing low gray scale picture that first sweeps partially dark problem.
Summary of the invention
Therefore, scan LED display first sweep partially dark problem for overcoming in prior art, the present invention proposes a kind of scanning LED display driving control device and method.
Particularly, the one scanning LED display driving control device that the embodiment of the present invention proposes, is suitable for being applied in M and sweeps LED display.Described scanning LED display driving control device comprises: subfield part layout module, N number of subfield part is divided into for the reality total subfield number layout needed for each corresponding for multiple gradation data gray scale being realized, N be greater than 1 positive integer, and increase N number of virtual scan subfield; Subfield part realization order arranges module, for determine according to predetermined manner each gray scale corresponding to described multiple gradation data realize corresponding to described N number of subfield part and the realization order of N number of virtual scan subfield; Suppose that the described N number of subfield part needed for a gray scale realization is characterized by N number of different layout number, and the subfield part comprising all or part of subfield in corresponding gradation data shared by identical data position gives identical layout number, then described predetermined manner comprises: each is taken turns before M sweeps and first realize a described virtual scan subfield, and the gradation data that described virtual scan subfield comprises is with in same wheel scan, first to sweep the gradation data that corresponding subfield comprises identical; And output module, to export successively according to the realization order after determining for the described N number of subfield part corresponding to each corresponding for described multiple gradation data gray scale is realized and N number of virtual scan subfield and sweep LED corresponding in LED display with M described in drived control and carry out gray scale display.
In addition, the one scanning LED display drived control method that the embodiment of the present invention proposes, is suitable for being applied in M and sweeps LED display.Described scanning LED display drived control method comprises step: the reality total subfield number layout needed for each corresponding for multiple gradation data gray scale being realized is divided into N number of subfield part, N be greater than 1 positive integer, and increase N number of virtual scan subfield; According to predetermined manner realize each gray scale corresponding to described multiple gradation data realize corresponding to described N number of subfield part and N number of virtual scan subfield; Suppose that the described N number of subfield part needed for a gray scale realization is characterized by N number of different layout number, then described predetermined manner comprises: each is taken turns before M sweeps and first realize a described virtual scan subfield, and the gradation data that described virtual scan subfield comprises is with in same wheel scan, first to sweep the gradation data that corresponding subfield comprises identical; And described N number of subfield part corresponding to each corresponding for described multiple gradation data gray scale being realized and N number of virtual scan subfield export successively according to the realization order after determining and sweep LED corresponding in LED display with M described in drived control and carry out gray scale display.
As from the foregoing, the embodiment of the present invention does the arrangement of further realization order to each subfield part that layout has divided, make, in each subfield part realized in same wheel scan, there is different subfield part layouts number at least partly, to efficiently solve in prior art identical layout work song field partial continuous in same wheel scan successively implementation produce first sweep partially dark problem when showing low gray scale picture.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of instructions, and can become apparent to allow above and other object of the present invention, feature and advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
Fig. 1 is a kind of conventional drived control mode schematic diagram scanning LED display of prior art.
Fig. 2 is the partial structurtes schematic diagram that a kind of 8 of prior art sweeps LED display.
Fig. 3 be in prior art first sweep output channel output waveform distortion schematic diagram.
Fig. 4 is a kind of high-level schematic functional block diagram scanning LED display driving control device of the embodiment of the present invention.
Fig. 5 scans LED display drived control mode schematic diagram in a kind of embodiment of the embodiment of the present invention.
Fig. 6 scans LED display drived control mode schematic diagram in the another kind of embodiment of the embodiment of the present invention.
Embodiment
The technological means and effect that predetermined goal of the invention takes is reached for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to the driving control device of scanning LED display proposed according to the present invention and its embodiment of method and effect, be described in detail as follows.
Fig. 4 is a kind of high-level schematic functional block diagram scanning LED display driving control device of the embodiment of the present invention.As shown in Figure 4, the gradation data of scanning LED display driving control device 10 pairs of enter video informations realizes gray shade scale by sub-field method, and it comprises: subfield part layout module 11, subfield part realization order arrangement module 13 and output module 15.
Wherein, subfield part layout module 11 is divided into N number of subfield part for the reality total subfield number layout needed for each corresponding for multiple gradation data gray scale being realized, N be greater than 1 positive integer, and increase N number of virtual scan subfield.
Suppose that different subfield parts adopts different layout number to characterize, the gray scale for different gradation data realizes, and the subfield part of identical layout number comprises whole subfield in gradation data shared by identical bit (s) or part subfield.For a gradation data for 16bits, suppose to realize the subfield number that the subfield number of the required actual total subfield number of a gray scale for 73 (also namely a gradation data is realized by 73 subfields) and shared by bit15-bit11 be set to shared by 32,16,8,4,2 and other bit10-bit0 respectively and be all set to 1; Then the subfield part of identical layout number can be:
(a) to comprise respectively in corresponding gradation data 8 subfields that whole subfields such as bit13 that a bit takies takies or
(b) to comprise respectively in corresponding gradation data 8 subfields in 32 subfields that part subfield such as bit15 that a bit takies takies or
C () comprises 8 subfields that whole subfields such as bit13 that multiple bits in corresponding gradation data takies takies and 1 subfield that bit0 takies respectively or is
D () comprises 1 subfield that 8 subfields in part subfield that one or more bit (s) in corresponding gradation data takies and 32 subfields that whole subfields such as bit15 that other one or more bit (s) take takies and bit0 take respectively.
It should be noted that, the reality total subfield number realized needed for a gray scale is not limited to 73 of above-mentioned citing, and can also be 42,93 etc., concrete numerical value then can be determined according to gradation data subfield arranged mode of the prior art.
Hold above-mentioned, subfield part realization order arrangement module 13 for determine according to predetermined manner each gray scale corresponding to described multiple gradation data realize corresponding to described N number of subfield part and the realization order of N number of virtual scan subfield.
In the embodiment of the present invention, described predetermined manner comprises: with the single output channel of driving chip, each is taken turns before M sweeps and first realize a described virtual scan subfield, the gradation data that described virtual scan subfield comprises is with in same wheel scan, first to sweep the gradation data that corresponding subfield comprises identical.
In a kind of embodiment, predetermined manner can also comprise: with the single output channel of driving chip, makes the virtual scan subfield that realizes in same wheel scan and each subfield part have identical layout number.
In another kind of embodiment, predetermined manner can also comprise: with the single output channel of driving chip, make, in the multiple subfield parts realized in same wheel scan, there is different layouts number at least partly, and preferably there is mutually different layout number.
Finally, output module 15 to export successively according to the realization order after determining for the described N number of subfield part corresponding to each corresponding for described multiple gradation data gray scale being realized and N number of virtual scan subfield and sweeps LED corresponding in LED display with M described in drived control and carry out gray scale display.
Fig. 5 is the one scanning LED display drived control mode schematic diagram of the embodiment of the present invention.For ease of understanding the different of the embodiment of the present invention and prior art, being still total for the reality realized needed for gray scale subfield number is divided into 8 parts in Fig. 5, also namely layout is divided into 8 subfield parts and adds 8 virtual scan subfields.According to predetermined manner, each take turns first sweep before both increase a virtual scan subfield, therefore, scanning LED display becomes 1+8 sweep for sweeping from existing 8, wherein 1 sweeps as virtual scan.Represent virtual scan with a, characterize first sweep with A, B characterizes second and sweeps ..., H characterizes the 8th and sweeps; Therefore need to carry out eight to take turns 1+8 and sweep to realize once traditional 8 and sweep complete gray scale.It should be noted that, the present invention's total subfield number of reality realized needed for a gray scale is not limited to layout and is divided into 8 subfield parts, also can be divided into any part, scanning LED display is not limited to 8 and sweeps LED display, also can be 9 to sweep, 16 to sweep, 27 sweep LED display etc.
Below to scan the scanning process of the single output channel of driving chip in LED display, please refer to Fig. 5, in a kind of embodiment of the present invention, each is taken turns 1+8 and sweeps the virtual scan subfield of middle realization and each subfield part (being also namely positioned at 1 virtual scan subfield on same row and 8 subfield parts) has identical layout number, such as first round 1+8 realizes virtual scan subfield a1 and the subfield part A1 that layout number is 1 successively in sweeping, B1, C1, D1, E1, F1, G1, H1, second takes turns during 1+8 sweeps and realizes virtual scan subfield a2 and the subfield part A2 that layout number is 2 successively, B2, C2, D2, E2, F2, G2, H2, by that analogy, 8th take turns 9 sweep in realize virtual scan subfield a8 and the subfield part A8 that layout number is 8 successively, B8, C8, D8, E8, F8, G8, H8.
Compared to Figure 1, each in Fig. 5 is taken turns and first to be swept (comprise A1, A2 ... A8) both increase virtual scan before, such as, add a1 before A1, before A2, add a2 ..., before A8, add a8.Wherein, the gradation data that virtual scan subfield comprises with in same wheel scan, first to sweep the gradation data that corresponding subfield comprises identical, such as, the gradation data that a1 comprises is identical with A1, the gradation data that a2 comprises is identical with A2 ..., the gradation data that a8 comprises is identical with A8.In this way, before normal first sweeps, when carrying out virtual scan, output channel is opened, electric charge on alignment stray capacitance Cp causes output waveform to be out of shape, and when normal first sweeps, output channel conducting during owing to just realizing virtual scan, alignment stray capacitance Cp discharges, spurious charge greatly reduces, therefore, normal first impact of spurious charge when sweeping is very little, substantially identical state is in when allowing the electric charge on alignment sweep with other when normal first sweeps, thus the luminance difference making each line show low gray scale greatly reduces, occur when also namely showing low gray scale picture that first sweeps partially dark problem.Open and the electric charge on alignment is bled off, be in substantially identical state when allowing the electric charge on alignment sweep with other when A sweeps, thus the luminance difference that each row shows low gray scale greatly reduces, first can be weakened in prior art to a certain extent and sweeps partially dark problem.
In other embodiments, also can all add virtual scan before often sweeping and the electric charge on alignment is released.
Please refer to Fig. 6, in another kind of embodiment of the present invention, the gradation data of subfield part layout module 11 in the diagram to input carries out after the layout of subfield part divided, the realization order of each subfield part layout divided by the subfield part realization order arrangement module 13 in Fig. 4 again arranges, 8 the subfield parts making the first round 9 sweep middle realization have mutually different layout number, such as, the first round 9 sweeps and realizes virtual scan subfield a1 and subfield part A1 successively, B2, C3, D4, E5, F6, G7, H8, second takes turns 9 sweeps and realizes virtual scan subfield a2 and subfield part A2 successively, B3, C4, D5, E6, F7, G8, H1, by that analogy, 8th takes turns 9 sweeps and realizes virtual scan subfield a8 and subfield part A8 successively, B1, C2, D3, E4, F5, G6, H7.Namely, the subfield part of identical layout number is not realize successively continuously, midfeather other layout work song field parts (the runic A1-H1 in such as Fig. 6) multiple yet; Therefore when carrying out the display of low gray scale, in other layout work song field part implementation procedures multiple of midfeather, the charging of alignment stray capacitance can be given in the line term of validity, so often sweep when realizing each subfield part, gap between the quantity of electric charge in alignment stray capacitance greatly reduces, thus the luminance difference that each row shows low gray scale greatly reduces.After the realization order of each subfield part arrange, follow-uply sequentially successively each subfield part can be exported to driving chip according to the realization after arrangement and carry out the corresponding LED of drived control and carry out gray scale display.
Preferably, a kind of subfield part realization order arrangement mode with better effect is that each subfield part realized successively in each wheel scan meets: scanning sequence number increases, the layout number of subfield part also increases, and next round scans initial subfield part layout number to be increased, such as, shown in Fig. 6.The realization of each subfield part of identical layout number can be separated by this subfield part realization order arrangement mode roughly uniformly.
Total for the reality realized needed for gray scale subfield number is supposed to be divided into N number of subfield part by layout, scanning LED display is that M sweeps (at least one driving chip typically also namely be in scanning LED display is 1/M scan mode), realizes M and sweeps complete gray scale and need to carry out N and take turns M and sweep the layout amounting to N*M subfield part.M represents scanning line number and m ∈ [0, (M-1)], k scan sequence number and k ∈ [0, (M*N-1)], n to represent the layout number of subfield part and n ∈ [0, (N-1)], then:
M=MOD (k, M), m=0 represent that first sweeps;
n=0 represents that layout number is the subfield part of 1, and S is adjustable value and S ∈ [0, (N-1)], the realization order arrangement mode that different S values is corresponding different, and in Fig. 6, S is 0.
For ease of understanding above-mentioned formula, sweeping the 8th subfield part H8 for the scan sequence number k=7 in Fig. 6 the 8th, its corresponding m=MOD (7,8)=7, representing that the 8th sweeps,
represent that the layout number of subfield part is 8; In like manner, sweep the 1st subfield part B1 for scan sequence number k=57 in Fig. 6 second, its corresponding m=MOD (57,8)=1, represent that second sweeps,
represent that the layout number of subfield part is 1.So far, from computation process, utilize above-mentioned formula can determine that position corresponding to this sweep number is for which subfield part which sweep according to sweep number.
Refer to explanation be, above-mentioned formula is determined be each subfield part realization order, but for virtual scan subfield, its position is determined by subfield part realization order arrangement module, namely each take turns first sweep before all increase a virtual scan subfield, and the gradation data that comprises of this virtual scan subfield is with in same wheel scan, first to sweep the gradation data that corresponding subfield comprises identical.
What deserves to be explained is, each subfield part realization order arrangement mode is not limited to shown in Fig. 6, as long as there is different layouts number at least partly in each subfield part realized in same wheel scan, better can to solve in prior art first like this and sweep partially dark problem.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. scan a LED display driving control device, be suitable for being applied in M and sweep LED display, it is characterized in that, described scanning LED display driving control device comprises:
Subfield part layout module, is divided into N number of subfield part for the reality total subfield number layout needed for each corresponding for multiple gradation data gray scale being realized, N be greater than 1 positive integer, and increase N number of virtual scan subfield;
Subfield part realization order arranges module, for determine according to predetermined manner each gray scale corresponding to described multiple gradation data realize corresponding to described N number of subfield part and the realization order of N number of virtual scan subfield; Suppose that the described N number of subfield part needed for a gray scale realization is characterized by N number of different layout number, and the subfield part comprising all or part of subfield in corresponding gradation data shared by identical data position gives identical layout number, then described predetermined manner comprises: each is taken turns before M sweeps and first realize a described virtual scan subfield, and the gradation data that described virtual scan subfield comprises is with in same wheel scan, first to sweep the gradation data that corresponding subfield comprises identical; And
Output module, to export successively according to the realization order after determining for the described N number of subfield part corresponding to each corresponding for described multiple gradation data gray scale being realized and N number of virtual scan subfield and sweeps LED corresponding in LED display with M described in drived control and carry out gray scale display.
2. scanning LED display driving control device as claimed in claim 1, it is characterized in that, described predetermined manner also comprises: make each subfield part in same wheel scan have identical layout number.
3. scanning LED display driving control device as claimed in claim 1, it is characterized in that, described predetermined manner also comprises: have different layouts number at least partly in M the subfield part each being taken turns realize in the inswept journey of M, M be greater than 1 positive integer.
4. scanning LED display driving control device as claimed in claim 3, is characterized in that, described each take turns M the subfield part realized in the inswept journey of M there is mutually different layout number.
5. scanning LED display driving control device as claimed in claim 3, is characterized in that, each in described predetermined manner is taken turns M and swept and meet relation:
M=MOD (k, M), m=0 represent that first sweeps;
n=0 represents that layout number is the subfield part of 1;
Wherein, k realizes M to sweep N in complete gray scale process and take turns M and sweep the scanning sequence number of N*M subfield part of realization and k ∈ [0, (M*N-1)], m represents scanning line number and m ∈ [0, (M-1)], n represents the layout number of subfield part and n ∈ [0, (N-1)], S is adjustable value and S ∈ [0, (N-1)].
6. scan a LED display drived control method, be suitable for being applied in M and sweep LED display, it is characterized in that, described scanning LED display drived control method comprises step:
Reality total subfield number layout needed for each corresponding for multiple gradation data gray scale being realized is divided into N number of subfield part, N be greater than 1 positive integer, and increase N number of virtual scan subfield;
According to predetermined manner realize each gray scale corresponding to described multiple gradation data realize corresponding to described N number of subfield part and N number of virtual scan subfield; Suppose that the described N number of subfield part needed for a gray scale realization is characterized by N number of different layout number, then described predetermined manner comprises: each is taken turns before M sweeps and first realize a described virtual scan subfield, and the gradation data that described virtual scan subfield comprises is with in same wheel scan, first to sweep the gradation data that corresponding subfield comprises identical; And
Described N number of subfield part corresponding to each corresponding for described multiple gradation data gray scale being realized and N number of virtual scan subfield export successively according to the realization order after determining and sweep LED corresponding in LED display with M described in drived control and carry out gray scale display.
7. scanning LED display drived control method as claimed in claim 6, it is characterized in that, described predetermined manner also comprises: make each subfield part in same wheel scan have identical layout number.
8. scanning LED display driving control device as claimed in claim 6, it is characterized in that, described predetermined manner also comprises: have different layouts number at least partly in M the subfield part each being taken turns realize in the inswept journey of M, M be greater than 1 positive integer.
9. scanning LED display drived control method as claimed in claim 8, is characterized in that, described each take turns M the subfield part realized in the inswept journey of M there is mutually different layout number.
10. scanning LED display drived control method as claimed in claim 8, is characterized in that, each in described predetermined manner is taken turns M and swept and meet relation:
M=MOD (k, M), m=0 represent that first sweeps;
n=0 represents that layout number is the subfield part of 1;
Wherein, k realizes M to sweep N in complete gray scale process and take turns M and sweep the scanning sequence number of N*M subfield part of realization and k ∈ [0, (M*N-1)], m represents scanning line number and m ∈ [0, (M-1)], n represents the layout number of subfield part and n ∈ [0, (N-1)], S is adjustable value and S ∈ [0, (N-1)].
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