CN104392695A - Quarter scanning light-emitting diode (LED) display resistor blanking circuit - Google Patents
Quarter scanning light-emitting diode (LED) display resistor blanking circuit Download PDFInfo
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- CN104392695A CN104392695A CN201410706565.1A CN201410706565A CN104392695A CN 104392695 A CN104392695 A CN 104392695A CN 201410706565 A CN201410706565 A CN 201410706565A CN 104392695 A CN104392695 A CN 104392695A
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Abstract
The invention discloses a quarter scanning light-emitting diode (LED) display resistor blanking circuit which comprises a decoder, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a capacitor. The decoder comprises a power supply end, a ground end, a first control end, a second control end, a first enabling end, a second enabling end, a first output end, a second output end, a third output end and a fourth output end. The capacitor is connected between the power supply end and the ground end, the first control end and the second control end are connected with a way of control signals input externally respectively. The first enabling end is connected with one end of the first resistor, the other end of the first resistor is connected with the ground, and the second enabling end is connected with an external switch through signals. Each output end is connected with a single LED line, and the resistors are connected between the lines and the ground. The blanking circuit of the decoder and the resistors is adopted to conduct blanking, the smearing problem of an LED display is effectively solved, and meanwhile the circuit is simple in structure, saves cost and facilitates wiring.
Description
Technical field
The invention belongs to electronics applications field, be specifically related to a kind of four/one scan LED display resistance blanking circuit.
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.
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 201320554575.9, and the applying date, a kind of LED display and LED thereof disclosed in the utility model patent on September 6th, 2013 showed module.This LED display, comprises multiple LED and shows module.This LED shows module, line on its lamp plate is by blanking circuit ground connection, the lamp plate of described LED display module also comprising the row voltage after making blanking can not be high secretly bright to producing hangover, also can not the low bleeder circuit to making LED reverse leakage current excessive, described bleeder circuit is connected between line and VCC.Have employed the LED display that technical solutions of the utility model LED shows module, owing to being provided with, bleeder circuit is set, adopt the mode of electric resistance partial pressure, the row voltage after blanking is made to remain on a high value, ensure that the row voltage after blanking can not be high secretly bright to producing hangover simultaneously, thus " caterpillar " phenomenon can well be prevented to occur, thus improve the display effect of LED display.
This patent adopts divider resistance that row voltage is remained at a high value, can affect the radiating effect of LED display, the heat on pcb board can not be fallen apart fast in surrounding environment.
Application number is 201310591165.6, and the applying date is that the patent of invention of 2013.11.22 discloses a kind of blanking circuit, 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.
Although this patent can solve smear problem to a certain extent, but, adopt two selector switch, this mode needs to switch for different circuit, in the prior art, the circuit of LED display determines, and adds the useful area that switch occupies PCB on the contrary, adds wiring difficulty while increasing cost.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of four/one scan LED display resistance blanking circuit, solve blanking circuit complex structure in prior art, problem rambunctious.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of four/one scan LED display resistance blanking circuit, comprise code translator, the first to the 5th resistance, an electric capacity, described code translator comprise power end, hold, the first control end, the second control end, the first Enable Pin, the second Enable Pin, first to fourth output terminal, described power end is connected electric capacity between holding with ground, first control end connects the first control signal of outside input, and the second control end connects the second control signal of outside input; First Enable Pin is connected with one end of the first resistance, the other end ground connection of the first resistance, and the second Enable Pin is connected with external switch signal; First output terminal respectively one end that is capable with the 4n+1 of LED display module, the second resistance is connected, second output terminal respectively one end that is capable with the 4n+2 of LED display module, the 3rd resistance is connected, 3rd output terminal respectively one end that is capable with the 4n+3 of LED display module, the 4th resistance is connected, 4th output terminal respectively one end that is capable with the 4n+4 of LED display module, the 5th resistance is connected, the other end ground connection of the second to the 5th resistance, wherein, n be more than or equal to 0 integer.
Described code translator is two or four code translators.
Described code translator is 74LS139.
The resistance of the described first to the 5th resistance is 50 ~ 150 ohm.
The resistance of the described first to the 5th resistance is 100 ohm.
The voltage of described power end is 3.3V ~ 5.5V.
The voltage of described power end is 5V.
Compared with prior art, the present invention has following beneficial effect:
1, the blanking circuit adopting code translator to add resistance carries out blanking, efficiently solves the problem of LED display smear, and meanwhile, structure is simple, convenient wiring while having saved cost.
2, the LED display for four/one scan adopts two or four code translators, effectively make use of the resource of chip, and wiring is simple, and cabling area is large.
3, adopt the resistance of 100 ohm, the residual charge after line pipe can be made to close effectively is released, and meanwhile, does not produce unnecessary heat.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, structure of the present invention and the course of work are described further.
As shown in Figure 1, a kind of four/one scan LED display resistance blanking circuit, comprise code translator U1, the first to the 5th resistance, an electric capacity C1, described code translator U1 comprise power end VCC, hold GND, the first control end A, the second control end B, the first Enable Pin E1, the second Enable Pin E2, first to fourth output terminal, described power end VCC holds between GND with ground and is connected electric capacity C1, first control end A connects the first control signal OA of outside input, and the second control end B connects the second control signal OB of outside input; First Enable Pin E1 is connected with one end of the first resistance R1, the other end ground connection of the first resistance R1, and the second Enable Pin E2 is connected with external switch signal OD; First output terminal Y0 is connected with the capable A1 of 4n+1 of LED display module, one end of the second resistance R2 respectively, second output terminal Y1 is connected with the capable A2 of 4n+2 of LED display module, one end of the 3rd resistance R3 respectively, 3rd output terminal Y2 is connected with the capable A3 of 4n+3 of LED display module, one end of the 4th resistance R4 respectively, 4th output terminal Y3 is connected with the capable A4 of 4n+4 of LED display module, one end of the 5th resistance R5 respectively, the other end ground connection of the second to the 5th resistance, wherein, n be more than or equal to 0 integer.
Described code translator is two or four code translators.
Described code translator is 74LS139.
The resistance of the described first to the 5th resistance is 50 ~ 150 ohm.
The resistance of the described first to the 5th resistance is 100 ohm.
The voltage of described power end is 3.3V ~ 5.5V.
The voltage of described power end is 5V.
Specific embodiment one,
A kind of four/one scan LED display resistance blanking circuit, comprise code translator, the first to the 5th resistance, an electric capacity, described code translator comprise power end, hold, the first control end, the second control end, the first Enable Pin, the second Enable Pin, first to fourth output terminal, described power end is connected electric capacity between holding with ground, first control end A connects the first control signal OA of outside input, and the second control end B connects the second control signal OB of outside input; First Enable Pin is connected with one end of the first resistance, the other end ground connection of the first resistance, and the second Enable Pin is connected with external switch signal; First output terminal is connected with one end of the 1st row of LED display module, the 5th row, the second resistance respectively, second output terminal is connected with one end of the 2nd row of LED display module, the 6th row, the 3rd resistance respectively, 3rd output terminal is connected with one end of the 3rd row of LED display module, the 7th row, the 4th resistance respectively, 4th output terminal is connected with one end of the 4th row of LED display module, eighth row, the 5th resistance respectively, the other end ground connection of the second to the 5th resistance.
Described code translator is two or four code translators, specifically selects model to be the code translator of 74LS139.
The resistance of the described first to the 5th resistance is 100 ohm.
The voltage of described power end is 5V.
Specific embodiment two,
A kind of four/one scan LED display resistance blanking circuit, comprise code translator, the first to the 5th resistance, an electric capacity, described code translator comprise power end, hold, the first control end, the second control end, the first Enable Pin, the second Enable Pin, first to fourth output terminal, described power end is connected electric capacity between holding with ground, first control end A connects the first via control signal OA of outside input, and the second control end B connects the second tunnel control signal OB of outside input; First Enable Pin is connected with one end of the first resistance, the other end ground connection of the first resistance, and the second Enable Pin is connected with external switch signal; First output terminal is connected with one end of the 1st row of LED display module, the 5th row, the 9th row, the second resistance respectively, second output terminal is connected with one end of the 2nd row of LED display module, the 6th row, the 10th row, the 3rd resistance respectively, 3rd output terminal is connected with one end of the 3rd row of LED display module, the 7th row, the 11st row, the 4th resistance respectively, 4th output terminal is connected with one end of the 4th row of LED display module, eighth row, the 12nd row, the 5th resistance respectively, the other end ground connection of the second to the 5th resistance.
Described code translator is two or four code translators, specifically selects model to be the code translator of 74LS139.
The resistance of the described first to the 5th resistance is 50 ohm.
The voltage of described power end is 5V.
Specific embodiment three,
A kind of four/one scan LED display resistance blanking circuit, comprise code translator, the first to the 5th resistance, an electric capacity, described code translator comprise power end, hold, the first control end, the second control end, the first Enable Pin, the second Enable Pin, first to fourth output terminal, described power end is connected electric capacity between holding with ground, first control end A connects the first control signal OA of outside input, and the second control end B connects the second control signal OB of outside input; First Enable Pin is connected with one end of the first resistance, the other end ground connection of the first resistance, and the second Enable Pin is connected with external switch signal; First output terminal is connected with one end of the 1st row of LED display module, the 5th row, the 9th row, the second resistance respectively, second output terminal is connected with one end of the 2nd row of LED display module, the 6th row, the 10th row, the 3rd resistance respectively, 3rd output terminal is connected with one end of the 3rd row of LED display module, the 7th row, the 11st row, the 4th resistance respectively, 4th output terminal is connected with one end of the 4th row of LED display module, eighth row, the 12nd row, the 5th resistance respectively, the other end ground connection of the second to the 5th resistance.
Described code translator is two or four code translators, specifically selects model to be the code translator of 74LS139.
The resistance of the described first to the 5th resistance is 150 ohm.
The voltage of described power end is 5V.
Claims (7)
1. four/one scan LED display resistance blanking circuit, it is characterized in that: comprise code translator, the first to the 5th resistance, an electric capacity, described code translator comprise power end, hold, the first control end, the second control end, the first Enable Pin, the second Enable Pin, first to fourth output terminal, described power end is connected electric capacity between holding with ground, first control end connects the first control signal of outside input, and the second control end connects the second control signal of outside input; First Enable Pin is connected with one end of the first resistance, the other end ground connection of the first resistance, and the second Enable Pin is connected with external switch signal; First output terminal respectively one end that is capable with the 4n+1 of LED display module, the second resistance is connected, second output terminal respectively one end that is capable with the 4n+2 of LED display module, the 3rd resistance is connected, 3rd output terminal respectively one end that is capable with the 4n+3 of LED display module, the 4th resistance is connected, 4th output terminal respectively one end that is capable with the 4n+4 of LED display module, the 5th resistance is connected, the other end ground connection of the second to the 5th resistance, wherein, n be more than or equal to 0 integer.
2. four/one scan LED display resistance blanking circuit according to claim 1, is characterized in that: described code translator is two or four code translators.
3. four/one scan LED display resistance blanking circuit according to claim 2, is characterized in that: described code translator is 74LS139.
4. four/one scan LED display resistance blanking circuit according to claim 1, is characterized in that: the resistance of the described first to the 5th resistance is 50 ~ 150 ohm.
5. four/one scan LED display resistance blanking circuit according to claim 4, is characterized in that: the resistance of the described first to the 5th resistance is 100 ohm.
6. four/one scan LED display resistance blanking circuit according to claim 1, is characterized in that: the voltage of described power end is 3.3V ~ 5.5V.
7. four/one scan LED display resistance blanking circuit according to claim 6, is characterized in that: the voltage of described power end is 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410706565.1A CN104392695A (en) | 2014-12-01 | 2014-12-01 | Quarter scanning light-emitting diode (LED) display resistor blanking circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410706565.1A CN104392695A (en) | 2014-12-01 | 2014-12-01 | Quarter scanning light-emitting diode (LED) display resistor blanking circuit |
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| Publication Number | Publication Date |
|---|---|
| CN104392695A true CN104392695A (en) | 2015-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410706565.1A Withdrawn CN104392695A (en) | 2014-12-01 | 2014-12-01 | Quarter scanning light-emitting diode (LED) display resistor blanking circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104992667A (en) * | 2015-06-30 | 2015-10-21 | 苏州合欣美电子科技有限公司 | Quarter scanning LED display screen drive circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101859513A (en) * | 2010-04-16 | 2010-10-13 | 北京巨数数字技术开发有限公司 | LED display device |
| CN103489407A (en) * | 2013-10-12 | 2014-01-01 | 深圳市大族元亨光电股份有限公司 | Non-control-lightening-free shadow elimination circuit for LED (Light Emitting Diode) 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 |
| CN203520832U (en) * | 2013-09-06 | 2014-04-02 | 深圳市奥拓电子股份有限公司 | LED display screen and LED display modules thereof |
-
2014
- 2014-12-01 CN CN201410706565.1A patent/CN104392695A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101859513A (en) * | 2010-04-16 | 2010-10-13 | 北京巨数数字技术开发有限公司 | LED display device |
| CN203520832U (en) * | 2013-09-06 | 2014-04-02 | 深圳市奥拓电子股份有限公司 | LED display screen and LED display modules thereof |
| CN103489407A (en) * | 2013-10-12 | 2014-01-01 | 深圳市大族元亨光电股份有限公司 | Non-control-lightening-free shadow elimination circuit for LED (Light Emitting Diode) 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104992667A (en) * | 2015-06-30 | 2015-10-21 | 苏州合欣美电子科技有限公司 | Quarter scanning LED display screen drive circuit |
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Application publication date: 20150304 |