CN106847166A - A kind of one of small spacing all-colour LED display module 128 scan method - Google Patents
A kind of one of small spacing all-colour LED display module 128 scan method Download PDFInfo
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- CN106847166A CN106847166A CN201710077655.2A CN201710077655A CN106847166A CN 106847166 A CN106847166 A CN 106847166A CN 201710077655 A CN201710077655 A CN 201710077655A CN 106847166 A CN106847166 A CN 106847166A
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- scan method
- display module
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- led display
- small spacing
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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]
Abstract
One of small spacing all-colour LED display module 128 of the invention scan method, comprises the following steps：1）SoC general processors minimum unit is from network interface real-time reception this module video compress bag；2）SoC general processors minimum unit decompression contracts and deposits LPDDR；3）A frame display data is read from LPDDR；4）SoC general processor minimum unit synchronism output channel serials column data gives 16 constant-current driven chips；5）SoC general processors minimum unit gates a row of channels；6）Repeat step 4）Until step 5）Until 128 rows have been brushed successively；7）Return to step 3）Repeated work flow, until the display data of all frames is disposed.Beneficial effect：Improve refresh rate；Greatly reduce chip count amount；Attachment structure is simple, good reliability.
Description
Technical field
The present invention relates to LED display modules and scan method, more particularly to a kind of small spacing all-colour LED display module 128
One of scan method.
Background technology
LED（ Light Emitting Diode）Large screen display system, as a kind of new media playing tool, is profit
The plane formula display screen constituted with LED lattice module or pixel cell.
P1 all-colour LEDs display module has a wide range of applications as a kind of extra small spacing indoor display screen elementary cell.By
Spacing is smaller between its pixel, so the pixel number in unit area is more, the ability to driving and control module has
Requirement higher.Traditional P1 all-colour LEDs display module is by the way of control, driving separation.If usual each control card is responsible for control
Dry plate module, using winding displacement series connection rgb signal and row selects signal between module.Whole display screen back side holding wire species is various,
Also by the way of pcb board superposing control card, scan mode is often swept with 1/32.Generally there are problems that refresh rate is not enough.
The content of the invention
The purpose of the present invention is to overcome the shortcomings of above-mentioned background technology, there is provided one kind shows towards extra small spacing all-colour LED
On the one hand one of module 128 scan method, the method can improve display screen refresh rate and tonal gradation, on the other hand simplify LED
Display screen structure and interconnection, while greatly reducing the chip count amount at the module PCB back sides.Specifically by following technical scheme reality
It is existing：
One of the small spacing all-colour LED display module 128 scan method, the P1.0 moulds of the 128*256 shown based on all-colour LED
Group, the module receives MPAG4 compressed format streaming media video bags, and streaming media video bag real-time decompression, the control of the module
System and drive circuit include the embedded SoC general processor minimum unit containing LPDDR, constant-current driven chip, coding chip
And binary channels metal-oxide-semiconductor current driver；
The scan method specifically includes following steps：
1）SoC general processors minimum unit is from network interface real-time reception this module video compress bag；
2）SoC general processors minimum unit decompression contracts and deposits LPDDR；
3）A frame display data is read from LPDDR；
4）SoC general processor minimum unit synchronism output channel serials column data gives 16 constant-current driven chips；
5）SoC general processors minimum unit gates a row of channels；
6）Repeat step 4）Until step 5）Until 128 rows have been brushed successively；
7）Return to step 3）Repeated work flow, until the display data of all frames is disposed.
The further design of one of the small spacing all-colour LED display module 128 scan method is that the SoC is general
Processor minimum unit also includes power management chip, two gigabit networking interfaces and Flash chip.
The further design of one of the small spacing all-colour LED display module 128 scan method is that the decoder is
The 7-128 decoders that 19 74HC138 cascades are constituted.
The further design of one of the small spacing all-colour LED display module 128 scan method is, the step 2）
In, SoC general processors minimum unit realizes that decompression contracts and deposits LPDDR by accelerator in the software and piece in the unit.
The further design of one of the small spacing all-colour LED display module 128 scan method is, the step 5）In
The gating of row of channels is realized by the horizontal-drive signal that the software is exported.
The further design of one of the small spacing all-colour LED display module 128 scan method is, the step 4）In
16 channel serial column datas are respectively correspondingly transferred to constant-current driven chip by the software.
The further design of one of the small spacing all-colour LED display module 128 scan method is that the constant current drives
Chip is 16 ICN2026 LED chips.
The further design of one of the small spacing all-colour LED display module 128 scan method is that the SoC is general
Processor minimum unit is connected one to one 48 ICN2026 by 48 GPIO.
The further design of one of the small spacing all-colour LED display module 128 scan method is, described 48
ICN2026 points is three groups, and per 16 ICN2026 of pack, and 48 ICN2026 complete the point of a line 256 RGB in 16 clock cycle
The write-in of signal.
The further design of one of the small spacing all-colour LED display module 128 scan method is, SoC general procedures
Device minimum unit is 32 bit processor chips.
Beneficial effects of the present invention are：
1st, refresh rate is improved：Sweep display module compared to existing 32, its refresh rate be maximum operating frequency 20MHz/ (32*256)=
2441Hz；The design refresh rate is 20MHz/ (128*16)=9765Hz, and refresh rate compares traditional module and improves 3 times.
2nd, chip count amount is greatly reduced：Tradition 32 sweeps 128*256 all-colour LED modules needs ICN2026 LED constant currents to drive
Dynamic chip 16*3*4=192 pieces, 138 coding chips 5,64 GS4953 binary channels metal-oxide-semiconductors current driver compositions, chip is total
Number about 261；The design chip count is about SoC and peripheral chip 5+19 piece 138+48 piece ICN2026+64 pieces GS4953=136
Piece, the gross area that chip is accounted for is small could be under the limited areal at the extra small spacing module PCB back sides directly arrangement.
3rd, attachment structure is simple, good reliability：Module external connection only needs two netting twines and one group of power line.
Brief description of the drawings
Fig. 1 is that P1 all-colour LEDs 1/128 sweep display module（128*256）Back side chip layout schematic diagram.
Fig. 2 is 7-128 decoder circuit block diagrams.
Specific embodiment
The application is described in further detail with reference to the accompanying drawings and detailed description.
Such as Fig. 1, the present embodiment towards one of small spacing all-colour LED display module 128 scan method, display module is based on
The P1.0 cell boards of the 128*256 that all-colour LED shows.
The module driving circuits are main by 32 embedded SoC general processor minimum units, 48 ICN2026
LED constant current driving chip, 19 138 coding chips and 64 GS4953 binary channels metal-oxide-semiconductors current driver compositions.This implementation
SoC general processors minimum unit is using the embeded processor based on ARM kernels in example, including the I/ effectively more than 60pin
O, two gigabit networking interfaces, power management chip, LPDDR and Flash is each a piece of.
Layout of the chip at the module back side is as shown in Figure 1.In figure, if 1 SoC and a piece of LPDDR and a piece of Flash and
Supply managing chip is arranged in pcb board centre position, and double RJ45 gigabits network interfaces are located at lower right, are next to two panels network PHY
Chip, is 5V power input interfaces in the middle of the right.Be staggered 48 ICN2026 LED constant current driving chips immediately below pcb board,
The 7-128 decoders that the left side is made up of 19 138 coding chips, decoder output 64 GS4953 binary channels metal-oxide-semiconductors of connection
Current driver.One channels drive a line LED of GS4953.
Scan method corresponding with above-mentioned module and step are specific as follows：
1）SoC general processors minimum unit is from network interface real-time reception this module video compress bag；
2）SoC general processors minimum unit decompression contracts and deposits LPDDR；
3）A frame display data is read from LPDDR；
4）SoC general processor minimum unit synchronism output channel serials column data gives 16 constant-current driven chips；
5）SoC general processors minimum unit gates a row of channels；
6）Repeat step 4）Until step 5）Until 128 rows have been brushed successively；
7）Return to step 3）Repeated work flow, until the display data of all frames is disposed.
The module realizes control and drives integration（All chips of integrated control and driving and soft on same pcb board
Part）, being interconnected using gigabit networking between module, module receives MPAG4 compressed format streaming media video bags, the SoC tools on module
There is real-time decompression ability.The horizontal-drive signal of the module is by 3 groups（Correspond R, G, B signal）Every group of 16 ICN202616
Channel LED constant-current driven chip is constituted, and SoC is connected one to one 48 ICN2026, only 16 clock cycle by 48 GPIO
Complete 256 write-ins of rgb signal of a line.
The 7-128 decoders that the module is used are translated and are made up of 19 74HC138 cascades.Connected mode is as shown in Figure 2：
A, B, C, D, E, F, G are 7 row drive wires, are arranged by 2 binary datas, and A is lowest order, and G is highest order.A, B, C 3
Bottom position signal connects 16 signal input parts of 74LS138 of the third level, 2 74LS138 of one-level in the middle of tri- signal connections of D, E, F
Signal input part.The lowest order input of a piece of 74LS138 of the G connection first order, another two input end grounding.The first order
74LS138 decodings output end Z0, Z1 connect the S2S3 control signals of the 74LS138 of middle one-level respectively, intergrade
74LS138 decodings output end Z0, Z1, Z2, Z3, Z4, Z5, Z6, Z7 are sequentially connected the S2S3 controls of the 74LS138 of the third level respectively
Input.
One of the small spacing all-colour LED display module 128 of the present embodiment scan method, has the advantages that：Improve
Refresh rate：Display module is swept compared to existing 32, its refresh rate is maximum operating frequency 20MHz/ (32*256)=2441Hz；Originally set
Meter refresh rate is 20MHz/ (128*16)=9765Hz, and refresh rate compares traditional module and improves 3 times.Greatly reduce chip count
Amount：Tradition 32 sweeps 128*256 all-colour LED modules needs ICN2026 LED constant current driving chip 16*3*4=192 pieces, 138 decodings
Chip 5,64 GS4953 binary channels metal-oxide-semiconductors current driver compositions, chip count about 261；The design chip count is about
It is SoC and peripheral chip 5+19 piece 138+48 piece ICN2026+64 piece GS4953=136 pieces, the gross area that chip is accounted for is small could be
Under the limited areal at the extra small spacing module PCB back sides is directly arranged.On the other hand, attachment structure is simple, good reliability：Module
External connection only needs two netting twines and one group of power line.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
Should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is defined.
Claims (10)
1. one of a kind of small spacing all-colour LED display module 128 scan method, it is characterised in that
The scan method is based on the P1.0 modules of the 128*256 that all-colour LED shows, the module receives MPAG4 compressed format streams
Media video bag, and streaming media video bag real-time decompression, the driving circuits of the module include containing the embedding of LPDDR
Enter formula SoC general processor minimum units, constant-current driven chip, coding chip and binary channels metal-oxide-semiconductor current driver；
The scan method specifically includes following steps：
1）SoC general processors minimum unit is from network interface real-time reception this module video compress bag；
2）SoC general processors minimum unit decompression contracts and deposits LPDDR；
3）A frame display data is read from LPDDR；
4）SoC general processor minimum unit synchronism output channel serials column data gives 16 constant-current driven chips；
5）SoC general processors minimum unit gates a row of channels；
6）Repeat step 4）Until step 5）Until 128 rows have been brushed successively；
7）Return to step 3）Repeated work flow, until the display data of all frames is disposed.
2. one of small spacing all-colour LED display module 128 according to claim 1 scan method, it is characterised in that described
SoC general processors minimum unit also includes power management chip, two gigabit networking interfaces and Flash chip.
3. one of small spacing all-colour LED display module 128 according to claim 1 scan method, it is characterised in that described
Decoder is the 7-128 decoders that 19 74HC138 cascades are constituted.
4. one of small spacing all-colour LED display module 128 according to claim 1 scan method, it is characterised in that described
Step 2）In, SoC general processors minimum unit is realized that decompression contracts and is deposited by accelerator in the software and piece in the unit
LPDDR。
5. one of small spacing all-colour LED display module 128 according to claim 4 scan method, it is characterised in that described
Step 5）The gating of middle row of channels is realized by the horizontal-drive signal that the software is exported.
6. one of small spacing all-colour LED display module 128 according to claim 4 scan method, it is characterised in that described
Step 4）Described in software 16 channel serial column datas are respectively correspondingly transferred to constant-current driven chip.
7. one of small spacing all-colour LED display module 128 according to claim 1 scan method, it is characterised in that described
Constant-current driven chip is 16 ICN2026 LED chips.
8. one of small spacing all-colour LED display module 128 according to claim 7 scan method, it is characterised in that described
SoC general processors minimum unit is connected one to one 48 ICN2026 by 48 GPIO.
9. one of small spacing all-colour LED display module 128 according to claim 8 scan method, it is characterised in that described
48 ICN2026 points is three groups, and per 16 ICN2026 of pack, and 48 ICN2026 complete a line 256 in 16 clock cycle
The write-in of point rgb signal.
10. one of small spacing all-colour LED display module 128 according to claim 1 scan method, it is characterised in that SoC
General processor minimum unit is 32 bit processor chips.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710077655.2A CN106847166B (en) | 2017-02-14 | 2017-02-14 | A scanning method for small-pitch full-color LED display module 128 |
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| CN201710077655.2A CN106847166B (en) | 2017-02-14 | 2017-02-14 | A scanning method for small-pitch full-color LED display module 128 |
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| CN105741757A (en) * | 2016-04-27 | 2016-07-06 | 南京大学 | High-refresh-rate 1/16 scanning P4 full-color LED display device and scanning method thereof |
| CN105976752A (en) * | 2016-04-27 | 2016-09-28 | 江苏利鼎微系统有限公司 | Scanning method of high refresh rate 1/64 scanning P4 full color LED display module group |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101673494A (en) * | 2009-08-18 | 2010-03-17 | 北京巨数数字技术开发有限公司 | Led display system |
| EP2306441A1 (en) * | 2009-09-30 | 2011-04-06 | Macroblock, Inc. | Scan-type display device control circuit |
| CN102760403A (en) * | 2011-04-25 | 2012-10-31 | 康佳集团股份有限公司 | Signal interface circuit of LED module and LED display device |
| CN203085135U (en) * | 2012-12-25 | 2013-07-24 | 深圳市科伦特科技有限公司 | LED module group blanking circuit |
| CN103077678A (en) * | 2013-01-05 | 2013-05-01 | 王知康 | Method for controlling LED (light emitting diode) display brightness by high-frequency distributed pulses |
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| US20150243203A1 (en) * | 2014-02-25 | 2015-08-27 | Lg Display Co., Ltd. | Display Having Selective Portions Driven with Adjustable Refresh Rate and Method of Driving the Same |
| US20150332635A1 (en) * | 2014-05-14 | 2015-11-19 | The Hong Kong University Of Science And Technology | Passive-matrix light-emitting diodes on silicon micro-display |
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