CN104966488A - One-fourth scanning LED display drive circuit - Google Patents
One-fourth scanning LED display drive circuit Download PDFInfo
- Publication number
- CN104966488A CN104966488A CN201510375832.6A CN201510375832A CN104966488A CN 104966488 A CN104966488 A CN 104966488A CN 201510375832 A CN201510375832 A CN 201510375832A CN 104966488 A CN104966488 A CN 104966488A
- Authority
- CN
- China
- Prior art keywords
- resistance
- led display
- signal
- selector switch
- driving circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a one-fourth scanning LED display drive circuit which comprises a drive IC, a power supply drive IC, a line scanning control IC, a blanking circuit, a filter circuit and a signal input and output port. The blanking circuit comprises a decoder, a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, a selection switch and magnetic beads from first to fourth. The magnetic beads from first to fourth are correspondingly connected in series with first, second, third and fourth output ends of the decoder. The second capacitor is connected between each output end in first, second, third and fourth output ends and the signal ground. An output signal is connected in series with the magnetic beads, and is connected with a small capacitor over the ground. Signal transmission is not affected. Clutter interference on signals can be effectively filtered out. The display effect of a display is improved. The operation is stable. Smear of a one-eighth scanning screen can be effectively inhibited.
Description
Technical field
The invention discloses a kind of four/one scan LED display driving circuit, belong to LED display application circuit field.
Background technology
A LED display industry always ubiquitous phenomenon is exactly smear, caterpillar, Ge great controller producer constantly improves this phenomenon, smear there will be front smear and rear smear, smear before so-called: namely LED itself can produce a joint capacitance problem, self also can serve as an electric capacity role, and this is front blanking; Smear after so-called: i.e. line pipe 4953 pairs of P ditch-metal-oxide-semiconductors, operationally, have 5V a to 0V to reach pass, reduces voltage process, can have the dark bright smear situation of forward voltage drop to the LED of (N-1) row.
For final blanking situation, discharge process can be carried out to 4953 on (N-1 is capable) when design circuit, namely increase blanking circuit, have following 3 kinds of schemes at present:
1, drop-down resistance to earth;
2, Schottky+pull down resistor;
3, CD4051+ Schottky.
Above-mentioned three kinds of schemes, respectively have excellent scarce part:
Scheme 1, advantage: economical, convenient; Shortcoming: carry out the drop-down of continuation to LED, can produce the back-pressure effect of larger spike;
Scheme 2, advantage can be carried out back-pressure and be clamped down at about 3.3V, and cost is inexpensive;
Scheme 3, the back-pressure size that advantage can periodically regulate electric discharge to produce; Shortcoming: element is more, cost increases.
The control signal provided for different controllers is different, such scheme very major part can not control by compatible all controllers, ready-made pcb board often can only pass through a kind of control system, especially all the more so of blanking circuit is possessed, producer is had to improve scheme, adopt on every block pcb board and resistance pad is all set, the resistance of change paster when needing, this scheme to some extent solves problem, but dismounting resistance hell to pay, has the risk that weldering is wrong, waste manpower and material resources, can not accuracy be ensured again.
Application number is 201310591165.6, and the applying date is a kind of blanking circuit disclosed in 22 days November in 2013, as shown in Figure 1, comprises code translator, electric capacity, the first to the 3rd resistance, the first selector switch, second selector switch; Described code translator comprises the first to the 3rd Enable Pin; Described first selector switch, the second selector switch include common port, the first contact, the second contact; The level state that different code translator IC Enable Pin correspondences connects is different, selects level state, facilitate the application of multiple IC by selector switch.The enable signal that different Systematical control provides is different, is selected the enable signal whether adopting system to provide by selector switch, and the compatibility that system is applied improves.
At present, in LED industry, the potential problem of scan screen, smear is never solved effectively, therefore, is also an industry problem urgently to be resolved hurrily when design scan screen driving circuit always.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of four/one scan LED display driving circuit, solve the scabrous problem of LED scan screen smear in prior art.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of four/one scan LED display driving circuit, comprise drive IC, Energy control IC, line scanning control IC, blanking circuit, filtering circuit, signal input output end mouth, wherein, drive IC is for controlling LED, Energy control IC is for controlling the break-make of power supply, line scanning control IC is used for the time that switch line is lighted, filtering circuit is used for the clutter of filter out power import, signal input output end mouth is used for the input and output of cascade between display screen module and signal, blanking circuit is for eliminating the smear of the generation in line scanning process, described blanking circuit comprises code translator, the first to the second electric capacity, first to the 3rd resistance, a selector switch, first to fourth magnetic bead, described code translator comprises the first to the second Enable Pin, first to fourth signal output part, and described selector switch comprises common port, the first contact, the second contact, one end of described first resistance is connected with the first Enable Pin, and the other end of the first resistance is connected with one end of the 3rd resistance, signal ground respectively, the described other end of the 3rd resistance is connected with the first contact of selector switch, second contact of described selector switch is connected with external control signal, and the common port of described selector switch is connected with the second Enable Pin, described one end of second resistance is connected with the power end of code translator, and the other end of described second resistance is connected with external power source, described power supply be connected the first electric capacity between signal ground, described first to fourth magnetic bead one_to_one corresponding is connected on first to fourth output terminal of code translator, is describedly all connected the second electric capacity between first to fourth output terminal each output terminal with signal ground.
Described code translator is 74HL139,74HC138 or CD54HC4051.
Described selector switch is single-pole double-throw switch (SPDT) or toggle switch.
The resistance of the described first to the 3rd resistance is 100 Europe.
Described drive IC is MBI5024 or MBI5042.
Described Energy control IC is 74HC4953.
The capacitance of described second electric capacity is less than 0.1uF.
Compared with prior art, beneficial effect of the present invention is:
(1) to connect in the output signal magnetic bead, connect a small capacitances over the ground, neither affect the transmission of signal, again can noise jamming effectively on filtered signal, improve the display effect of display screen, run more stable, effective inhibiting effect can be played to the smear of eight/one scan screen.
(2) enable signal that different Systematical control provides is different, is selected the enable signal whether adopting system to provide by selector switch, and the compatibility that system is applied improves.
(3) do not need to dismantle resistance, the switching of each state can be completed, saved manpower and materials, ensure that the reliability of LED product PCB.
(4) level state that different code translator IC Enable Pin correspondences connects is different, selects level state, facilitate the application of multiple IC by selector switch.
Accompanying drawing explanation
Fig. 1 is the blanking circuit figure of background technology.
Fig. 2 is blanking circuit figure of the present invention.
Embodiment
Below in conjunction with drawings and Examples, technical scheme of the present invention is described in detail:
As shown in Figure 2, a kind of four/one scan LED display driving circuit, comprise drive IC, Energy control IC, line scanning control IC, blanking circuit, filtering circuit, signal input output end mouth, wherein, drive IC is for controlling LED, Energy control IC is for controlling the break-make of power supply, line scanning control IC is used for the time that switch line is lighted, filtering circuit is used for the clutter of filter out power import, signal input output end mouth is used for the input and output of cascade between display screen module and signal, blanking circuit is for eliminating the smear of the generation in line scanning process, described blanking circuit comprises code translator, first electric capacity C1, second electric capacity C2, first to the 3rd resistance, selector switch S1, first to fourth magnetic bead L1 to L4, described code translator comprises the first to the second Enable Pin, first to fourth signal output part, and described selector switch S1 comprises common port, the first contact, the second contact, one end of described first resistance R1 is connected with the first Enable Pin, and the other end of the first resistance R1 is connected with one end of the 3rd resistance R4, signal ground GND respectively, the described other end of the 3rd resistance R4 is connected with first contact of selector switch S1, second contact of described selector switch S1 is connected with external control signal, and the common port of described selector switch S1 is connected with the second Enable Pin, one end of described second resistance R2 is connected with the power end of code translator, and the other end of described second resistance R2 is connected with external power source, described power supply VCC be connected the first electric capacity C1 between signal ground GND, described first to fourth magnetic bead one_to_one corresponding is connected on first to fourth output terminal of code translator, is describedly all connected the second electric capacity C2 between first to fourth output terminal each output terminal with signal ground.
Described code translator is 74HL139,74HC138 or CD54HC4051.
Embodiment one, described code translator is 74HL139 or 74HC138, adjacent successively four output terminals of 74HC138 are as first to fourth output terminal, each loop cycle controls four lines LED, Enable Pin adopts first, second Enable Pin, and other pins vacated adopt unsettled setting or direct contact resistance to power supply.
Control Enable Pin by external control signal OD, make the switching time of this blanking circuit more flexible, there is good blanking controllability.
74HC138 plays the effect that row is selected to control in LED display module, and 74HC138 is a high-speed cmos device, 74HC138 pin compatibility low-power consumption Schottky TTL (LSTTL) series.
74HC138 code translator can accept 3 binary weighting addresses input (A0, A1 and A2), and when enabled, provides low effective output (Y0 to Y7) of 8 mutual exclusions.Peculiar 3 the enable input ends of 74HC138: two low effectively (E1 and E2) and one high effective (E3).Unless E1 and E2 sets low and E3 sets high, otherwise all for maintenance output is high by 74HC138.Utilize the enable characteristic of this compound, only need 4 74HC138 chips and 1 phase inverter, easily can realize parallel-expansion, be combined into a 1-32 (5 lines are to 32 lines) code translator.An optional low effective enable input end inputs as data, and using remaining enable input end as gating end, then 74HC138 also can serve as 8 output multi-channel dividers, and untapped enable input end must keep being bundled in the effective or low effective status of height suitable separately.
Embodiment two, described code translator is that four output terminals that CD54HC4051, CD54HC4051 are adjacent are successively as first to fourth output terminal.The level state that same code translator IC Enable Pin correspondence connects is different, selects level state, facilitate the application of multiple IC by selector switch.Do not need to dismantle resistance, the switching of each state can be completed, saved manpower and materials, ensure that the reliability of LED product PCB.
Described selector switch is single-pole double-throw switch (SPDT) or toggle switch.
The resistance of the described first to the 3rd resistance is 100 Europe.
Described drive IC is MBI5024 or MBI5042.
MBI5024 utilizes up-to-date PrecisionDrive
tMtechnology, aim at the drive IC of LED display panel design, the CMOS bit shift register that it is built-in and bolt-lock function, can convert the input data of serial to parallel output data formats.
The input voltage range value of MBI5024 is 3.3 volts to 5 volts, provides 16 current sources, 3-45mA can be provided to determine the magnitude of current with driving LED in each output stage; And in single IC the current difference of output channel be less than ± 3%; Output current difference between many IC is less than ± and 6%; Electric current, along with output terminal withstand voltage (VDS) change, is controlled in every volt 0.1%; And electric current is subject to service voltage (VDD), the change of environment temperature is also controlled in 1%.User can via selecting the RSET of different resistance to adjust the size of current of each output stage of MBI5024, by this mechanism, and user can the luminosity of accurately control LED.
The design of MBI5024 ensures that its output stage can be withstand voltage 17 volts, therefore can be connected in series multiple LED at each output terminal.
In addition, MBI5024 also provides the high clock frequency of 25MHz to meet system to the demand in mass data transmission.
Described Energy control IC is 74HC4953.
The capacitance of described second electric capacity is less than 0.1uF.Be preferably 0.01uF electric capacity.
Those skilled in the art of the present technique are understandable that, unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Claims (7)
1. four/one scan LED display driving circuit, comprise drive IC, Energy control IC, line scanning control IC, blanking circuit, filtering circuit, signal input output end mouth, wherein, drive IC is for controlling LED, Energy control IC is for controlling the break-make of power supply, line scanning control IC is used for the time that switch line is lighted, filtering circuit is used for the clutter of filter out power import, signal input output end mouth is used for the input and output of cascade between display screen module and signal, blanking circuit is for eliminating the smear of the generation in line scanning process, it is characterized in that: described blanking circuit comprises code translator, the first to the second electric capacity, first to the 3rd resistance, a selector switch, first to fourth magnetic bead, described code translator comprises the first to the second Enable Pin, first to fourth signal output part, and described selector switch comprises common port, the first contact, the second contact, one end of described first resistance is connected with the first Enable Pin, and the other end of the first resistance is connected with one end of the 3rd resistance, signal ground respectively, the described other end of the 3rd resistance is connected with the first contact of selector switch, second contact of described selector switch is connected with external control signal, and the common port of described selector switch is connected with the second Enable Pin, described one end of second resistance is connected with the power end of code translator, and the other end of described second resistance is connected with external power source, described power supply be connected the first electric capacity between signal ground, described first to fourth magnetic bead one_to_one corresponding is connected on first to fourth output terminal of code translator, is describedly all connected the second electric capacity between first to fourth output terminal each output terminal with signal ground.
2. four/one scan LED display driving circuit according to claim 1, is characterized in that: described code translator is 74HL139,74HC138 or CD54HC4051.
3. four/one scan LED display driving circuit according to claim 1, is characterized in that: described selector switch is single-pole double-throw switch (SPDT) or toggle switch.
4. four/one scan LED display driving circuit according to claim 1, is characterized in that: the resistance of the described first to the 3rd resistance is 100 Europe.
5. four/one scan LED display driving circuit according to claim 1, is characterized in that: described drive IC is MBI5024 or MBI5042.
6. four/one scan LED display driving circuit according to claim 1, is characterized in that: described Energy control IC is 74HC4953.
7. four/one scan LED display driving circuit according to claim 1, is characterized in that: the capacitance of described second electric capacity is less than 0.1uF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510375832.6A CN104966488A (en) | 2015-06-30 | 2015-06-30 | One-fourth scanning LED display drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510375832.6A CN104966488A (en) | 2015-06-30 | 2015-06-30 | One-fourth scanning LED display drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104966488A true CN104966488A (en) | 2015-10-07 |
Family
ID=54220517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510375832.6A Pending CN104966488A (en) | 2015-06-30 | 2015-06-30 | One-fourth scanning LED display drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104966488A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107358913A (en) * | 2017-09-05 | 2017-11-17 | 深圳市明微电子股份有限公司 | A kind of the disappear row of shadow function of band sweeps decoding control circuit and chip |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100134041A1 (en) * | 2007-04-24 | 2010-06-03 | Koninklijke Philips Electronics N.V. | Led string driver with shift register and level shifter |
| CN202855257U (en) * | 2012-05-31 | 2013-04-03 | 上海得倍电子技术有限公司 | High-speed blanking LED large-screen scanning monitor |
| EP2605112A2 (en) * | 2011-12-13 | 2013-06-19 | LG Display Co., Ltd. | Touch sensor integrated type display and method for driving the same |
| CN103489408A (en) * | 2013-10-23 | 2014-01-01 | 苏州天微工业技术有限公司 | Display screen drive control circuit and display screen |
| CN103646628A (en) * | 2013-11-22 | 2014-03-19 | 无锡莱吉特信息科技有限公司 | Blanking circuit |
| CN104079165A (en) * | 2014-07-11 | 2014-10-01 | 湖南新亚胜科技发展有限公司 | Display screen with electromagnetic interference suppression function |
| CN204834002U (en) * | 2015-06-30 | 2015-12-02 | 陶象余 | Fourth scanning LED display screen drive circuit |
-
2015
- 2015-06-30 CN CN201510375832.6A patent/CN104966488A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100134041A1 (en) * | 2007-04-24 | 2010-06-03 | Koninklijke Philips Electronics N.V. | Led string driver with shift register and level shifter |
| EP2605112A2 (en) * | 2011-12-13 | 2013-06-19 | LG Display Co., Ltd. | Touch sensor integrated type display and method for driving the same |
| CN202855257U (en) * | 2012-05-31 | 2013-04-03 | 上海得倍电子技术有限公司 | High-speed blanking LED large-screen scanning monitor |
| CN103489408A (en) * | 2013-10-23 | 2014-01-01 | 苏州天微工业技术有限公司 | Display screen drive control circuit and display screen |
| CN103646628A (en) * | 2013-11-22 | 2014-03-19 | 无锡莱吉特信息科技有限公司 | Blanking circuit |
| CN104079165A (en) * | 2014-07-11 | 2014-10-01 | 湖南新亚胜科技发展有限公司 | Display screen with electromagnetic interference suppression function |
| CN204834002U (en) * | 2015-06-30 | 2015-12-02 | 陶象余 | Fourth scanning LED display screen drive circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107358913A (en) * | 2017-09-05 | 2017-11-17 | 深圳市明微电子股份有限公司 | A kind of the disappear row of shadow function of band sweeps decoding control circuit and chip |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102855841B (en) | Led display system | |
| CN104575436A (en) | Shifting register unit, grid driving circuit and display device | |
| CN105118414A (en) | Shift register, driving method thereof, gate driving circuit, and display device | |
| CN101609719B (en) | Shift register of display device | |
| CN103646628B (en) | A kind of blanking circuit | |
| CN105206246A (en) | Scan driving circuit and liquid crystal display device employing same | |
| CN103137207A (en) | Shift temporary storage device | |
| CN104732945A (en) | Shifting register, drive method, array substrate grid drive device and display panel | |
| CN102708802B (en) | Light emitting diode (LED) display system | |
| CN202838909U (en) | Shifting register, grid driving circuit and display device | |
| CN105513522A (en) | Shifting register, driving method thereof, drive circuit and display device | |
| CN108010480A (en) | Gate driving circuit | |
| CN205004013U (en) | Eighth scanning LED display screen drive circuit | |
| CN204834002U (en) | Fourth scanning LED display screen drive circuit | |
| CN104966488A (en) | One-fourth scanning LED display drive circuit | |
| CN104732946A (en) | Shifting register and display device | |
| CN104821151A (en) | LED display control method and LED lamp plate | |
| CN204884519U (en) | Blanking circuit | |
| CN104966486A (en) | One-eighth scanning LED display drive circuit | |
| CN108597433B (en) | Display device | |
| CN108712166B (en) | Self-adaptive level conversion circuit | |
| CN207742915U (en) | A kind of the disappear row of shadow function of band sweeps decoding control circuit and chip | |
| CN102568369A (en) | Flat panel display, displacement buffer and control method thereof | |
| CN204946511U (en) | Shift register, gate driver circuit, display device | |
| CN102509537B (en) | Shift register of display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: Jiangning Lukou Street District of Nanjing city in Jiangsu province 211100 Yongxin Xinyu Lily court 27 building 508 room Applicant after: Tao Xiangyu Address before: Jiangning District of Nanjing City, Jiangsu province 211100 Lukou Street No. 5 Lane Community Qun Li Zan Applicant before: Tao Xiangyu |
|
| COR | Change of bibliographic data | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151007 |