CN204884519U - Blanking circuit - Google Patents
Blanking circuit Download PDFInfo
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- CN204884519U CN204884519U CN201520460214.7U CN201520460214U CN204884519U CN 204884519 U CN204884519 U CN 204884519U CN 201520460214 U CN201520460214 U CN 201520460214U CN 204884519 U CN204884519 U CN 204884519U
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- selector switch
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Abstract
The utility model discloses a blanking circuit, including decoder, electric capacity, first to third resistance, a select switch, the 2nd select switch, the decoder includes that first messenger to the third can hold, a select switch, the 2nd select switch all include common port, first contact, second contact, decoder first to the 8th output magnetic bead of all establishing ties, and first to all being connected a filter capacitance between the 8th output and the signal ground, different decoder IC makes the level state that can the terminal pair should connect different, through select switch selection level state, has made things convenient for multiple IC's application. The enable signal that different system control provided is different, selects the enable signal that whether adoption system provided through select switch for the compatible improvement that the system used, the magnetic bead of establishing ties on output signal neither influences the transmission of signal, and the effective noise jamming on the filtering signal has again improved the display effect of display screen, moves more stably.
Description
Technical field
The utility model discloses a kind of blanking circuit, particularly relate to a kind of LED display blanking 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.
Although above-mentioned patent effectively can play blanking circuit, in the process that display screen is lighted, easily there is the phenomenon of flicker, affect display effect.
Summary of the invention
Technical problem to be solved in the utility model is: provide a kind of blanking circuit, solves blanking circuit in prior art and lacks the problem that filtering produces screen sudden strain of a muscle.
For solving the problems of the technologies described above, the technical solution of the utility model is:
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, the first to the 8th output terminal, and wherein the second Enable Pin is low effective Enable Pin; Described first selector switch, the second selector switch include 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 the first selector switch; Second contact of described first selector switch is connected with external control signal, and the common port of described first selector switch is connected with the second Enable Pin; One end of described second resistance is connected with the 3rd Enable Pin, and the other end of described second resistance is connected with the common port of the second selector switch; First contact of described second selector switch is connected with power supply, and the second contact of described second selector switch is connected with signal ground; Described power supply is connected electric capacity with between signal ground, and the first to the 8th output terminal of described code translator is all connected a magnetic bead, and first to the 8th is all connected a filter capacitor between output terminal with signal ground.
The resistance of the described first to the 3rd resistance is 100 Europe.
The capacitance of described filter capacitor is less than 0.1uF.
The capacitance of described filter capacitor is less than 0.01uF.
Described code translator is 74HC138, and the common port of described first selector switch is connected with the second contact of the first selector switch; The common port of described second selector switch is connected with the first contact of the second selector switch.
Described code translator is CD54HC4051, and the common port of described first selector switch is connected with the second contact of the first selector switch; The common port of described second selector switch is connected with the second contact of the second selector switch.
Described first selector switch, the second selector switch are single-pole double-throw switch (SPDT) or toggle switch.
Compared with prior art, the beneficial effects of the utility model are:
(1) to connect in the output signal magnetic bead, connect a small capacitances over the ground in the output signal simultaneously, neither affect the transmission of signal, again can noise jamming effectively on filtered signal, improve the display effect of display screen, run more stable.
(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 utility model.
Embodiment
Below in conjunction with drawings and Examples, the technical solution of the utility model is described in detail:
As shown in Figure 2, a kind of blanking circuit, comprises code translator, electric capacity C1, the first to the 3rd resistance, the first selector switch S1, the second selector switch S2; Described code translator comprises the first to the 3rd Enable Pin, the first to the 8th output terminal, and wherein the second Enable Pin is low effective Enable Pin; Described first selector switch S1, the second selector switch S2 include 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 the first selector switch S1; Second contact of described first selector switch S1 is connected with external control signal, and the common port of described first selector switch S1 is connected with the second Enable Pin; One end of described second resistance R2 is connected with the 3rd Enable Pin, and the other end of described second resistance R2 is connected with the common port of the second selector switch S2; First contact of described second selector switch S2 is connected with power supply VCC, and second contact of described second selector switch S2 is connected with signal ground GND; Described power supply VCC is connected electric capacity C1 with between signal ground GND, and the first to the 8th output terminal of described code translator is all connected a magnetic bead, be respectively L1 to L8, and first to the 8th is all connected a filter capacitor between output terminal with signal ground.
To connect in the output signal magnetic bead, connect a small capacitances over the ground in the output signal simultaneously, neither affect the transmission of signal, again can noise jamming effectively on filtered signal, improve the display effect of display screen, run more stable.
The resistance of the described first to the 3rd resistance is 100 Europe.
The capacitance of described filter capacitor is less than 0.1uF.
The capacitance of described filter capacitor is less than 0.01uF.
Described code translator is 74HC138, and the common port of described first selector switch is connected with the second contact of the first selector switch; The common port of described second selector switch is connected with the first contact of the second selector switch.
Described code translator is CD54HC4051, and the common port of described first selector switch is connected with the second contact of the first selector switch; The common port of described second selector switch is connected with the second contact of the second selector switch.
Described first selector switch, the second selector switch are single-pole double-throw switch (SPDT) or toggle switch.
Embodiment one, described code translator is 74HC138, and the common port of described first selector switch S1 is connected with second contact of the first selector switch S1; The common port of described second selector switch S2 is connected with first contact of the second selector switch S2.
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 CD54HC4051, and the common port of described first selector switch S1 is connected with second contact of the first selector switch S1; The common port of described second selector switch S2 is connected with second contact of the second selector switch S2.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 first selector switch S1, the second selector switch S2 are single-pole double-throw switch (SPDT) or toggle switch.
When selecting the system with OD control signal, the common port of described first selector switch S1 is connected with second contact of the first selector switch S1.
When selecting the system without OD control signal, the common port of described first selector switch S1 is connected with first contact of the first selector switch S1.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.
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 utility model.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. a 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, the first to the 8th output terminal, and wherein the second Enable Pin is low effective Enable Pin; Described first selector switch, the second selector switch include 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 the first selector switch; Second contact of described first selector switch is connected with external control signal, and the common port of described first selector switch is connected with the second Enable Pin; One end of described second resistance is connected with the 3rd Enable Pin, and the other end of described second resistance is connected with the common port of the second selector switch; First contact of described second selector switch is connected with power supply, and the second contact of described second selector switch is connected with signal ground; Described power supply is connected electric capacity with between signal ground, it is characterized in that: the first to the 8th output terminal of described code translator is all connected a magnetic bead, and first to the 8th is all connected a filter capacitor between output terminal with signal ground.
2. blanking circuit according to claim 1, is characterized in that: the resistance of the described first to the 3rd resistance is 100 Europe.
3. blanking circuit according to claim 1, is characterized in that: the capacitance of described filter capacitor is less than 0.1uF.
4. blanking circuit according to claim 3, is characterized in that: the capacitance of described filter capacitor is less than 0.01uF.
5. blanking circuit according to claim 1, is characterized in that: described code translator is 74HC138, and the common port of described first selector switch is connected with the second contact of the first selector switch; The common port of described second selector switch is connected with the first contact of the second selector switch.
6. blanking circuit according to claim 1, is characterized in that: described code translator is CD54HC4051, and the common port of described first selector switch is connected with the second contact of the first selector switch; The common port of described second selector switch is connected with the second contact of the second selector switch.
7. blanking circuit according to claim 1, is characterized in that: described first selector switch, the second selector switch are single-pole double-throw switch (SPDT) or toggle switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520460214.7U CN204884519U (en) | 2015-06-30 | 2015-06-30 | Blanking circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520460214.7U CN204884519U (en) | 2015-06-30 | 2015-06-30 | Blanking circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204884519U true CN204884519U (en) | 2015-12-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520460214.7U Expired - Fee Related CN204884519U (en) | 2015-06-30 | 2015-06-30 | Blanking circuit |
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| Country | Link |
|---|---|
| CN (1) | CN204884519U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104966487A (en) * | 2015-06-30 | 2015-10-07 | 傅明尧 | Blanking circuit |
| CN107809654A (en) * | 2017-11-01 | 2018-03-16 | 深圳Tcl新技术有限公司 | System for TV set and TV set control method |
-
2015
- 2015-06-30 CN CN201520460214.7U patent/CN204884519U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104966487A (en) * | 2015-06-30 | 2015-10-07 | 傅明尧 | Blanking circuit |
| CN107809654A (en) * | 2017-11-01 | 2018-03-16 | 深圳Tcl新技术有限公司 | System for TV set and TV set control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151216 Termination date: 20170630 |