CN202549245U - LED (Light Emitting Diode) scanning circuit - Google Patents
LED (Light Emitting Diode) scanning circuit Download PDFInfo
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- CN202549245U CN202549245U CN2012200202669U CN201220020266U CN202549245U CN 202549245 U CN202549245 U CN 202549245U CN 2012200202669 U CN2012200202669 U CN 2012200202669U CN 201220020266 U CN201220020266 U CN 201220020266U CN 202549245 U CN202549245 U CN 202549245U
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- selecting unit
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- horizontal scanning
- code translator
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Abstract
The utility model relates to an LED (Light Emitting Diode) scanning circuit. The LED scanning circuit comprises a decoder, a plurality of row scanning lines connected with the decoder and a channel selection unit. The channel selection unit and the decoder share an address signal. A channel terminal of the channel selection unit selected by the address signal is connected with one of the row scanning lines. One of the row scanning lines is a previous row scanning line of the row scanning lines connected to an address output terminal of the decoder, wherein the one of the row scanning lines is selected by the same address signal. The output terminal of the channel selection unit is grounded through a discharge resistor. According to the LED scanning circuit provided by the utility model, when a row scanning line is selected to be conducted by the decoder according to the address signal, the address signal selects the previous row scanning line of the row scanning lines selected by the decoder through the channel selection unit simultaneously so that the row scanning line discharges to the ground through the discharge resistor connected with the output terminal of the channel selection unit, therefore, the discharge speed is accelerated, and dark light phenomenon is eliminated.
Description
[technical field]
The utility model relates to field of electronic display, particularly relates to a kind of LED sweep circuit.
[background technology]
Traditional LED (light emitting diode) sweep circuit when scanning, owing to the reasons such as capacitor discharge effect that have stray capacitance, can cause that adjacent LED is capable dark bright phenomenon to occur, makes display effect not good.
[utility model content]
Based on this, be necessary to provide a kind of LED sweep circuit that can eliminate dark bright phenomenon (blanking).
A kind of LED sweep circuit comprises code translator, many horizontal scanning lines that are connected with said code translator, also comprises the channel selecting unit; Said channel selecting unit and said code translator shared address signal; The tunnel ends of being chosen by said address signal of said channel selecting unit connects wherein of said many horizontal scanning lines, and the previous row sweep trace of the horizontal scanning line that connects of the address output end of the code translator chosen by same said address signal of said wherein horizontal scanning line; The output terminal of said channel selecting unit is through discharge resistance ground connection.
Preferably, the address signal input end number of said code translator is identical with the address signal input end number of said channel selecting unit, and the address output end number of said code translator is identical with the tunnel ends number of said channel selecting unit.
Preferably; Said code translator is three or eight code translators; Each said three or eight code translator is connected eight horizontal scanning lines with the channel selecting unit; The the 0th to the 7th address output end of said three or eight code translators first to the 8th horizontal scanning line that is linked in sequence respectively, the 0th to the 6th tunnel ends of said channel selecting unit second to the 8th horizontal scanning line that is linked in sequence respectively, the 7th tunnel ends of said channel selecting unit connects first horizontal scanning line.
Preferably, the model of said three or eight code translators is 74HC138, and the model of said channel selecting unit is CD4051.
Preferably; Every said horizontal scanning line includes switching device and LED; The control end of said switching device connects the corresponding address output end of said code translator, and first end of said switching device connects power end, and second end of said switching device connects the positive pole of said LED.
Preferably, said switching device is a P channel MOS tube, and said control end is the grid of a P channel MOS tube, and said first end is the source electrode of a P channel MOS tube, and said second end is the drain electrode of a P channel MOS tube.
Preferably, comprise monostalbe trigger, the non-end of the Q of said monostalbe trigger connects the Enable Pin of said code translator.
Preferably, the model of said monostalbe trigger is 74HC123.
Preferably; Comprise the 2nd P channel MOS tube; The grid of said the 2nd P channel MOS tube connects the latch signal input end; The drain electrode of said the 2nd P channel MOS tube connects the high signal input live end of said channel selecting unit and connects power end, the source ground of said the 2nd P channel MOS tube through current-limiting resistance.
Above-mentioned LED sweep circuit; When choosing a horizontal scanning line conducting through code translator according to address signal; Address signal is chosen the previous row sweep trace of the horizontal scanning line that code translator chooses simultaneously through the channel selecting unit; The discharge resistance that its output terminal that passes through the channel selecting unit is connected discharges over the ground, has therefore accelerated the velocity of discharge, has eliminated dark bright phenomenon.
[description of drawings]
Fig. 1 is the circuit theory diagrams of LED sweep circuit among the embodiment.
[embodiment]
For purpose, the feature and advantage that make the utility model can be more obviously understandable, the embodiment of the utility model is done detailed explanation below in conjunction with accompanying drawing.
Fig. 1 is the circuit theory diagrams of LED sweep circuit among the embodiment, comprises code translator U2, many horizontal scanning lines that are connected with code translator U2 and channel selecting unit U4.Channel selecting unit U4 and code translator U2 shared address signal ABC.Each of address signal ABC all is binary signals, promptly is made up of three binary signals.In this embodiment, the address signal input end number of code translator U2 is identical with the address signal input end number of channel selecting unit U4; In other embodiments; The address signal input end number of code translator also can be inequality with the address signal input end number of channel selecting unit; For example code translator U2 is one two or four code translator, and the address signal input end number of channel selecting unit U4 is three and most significant digit zero setting (connecing low level).In addition; Even under the identical situation of address signal input end number; The address signal input end of code translator U2 and channel selecting unit U4 also not necessarily wants complete correspondence as shown in Figure 1 to be connected; The lowest order that for example most significant digit of the address signal input end of code translator U2 can interface channel selected cell U4, but the annexation of corresponding address output end/tunnel ends is wanted modify.Same, in the present embodiment, the address output end number of code translator U2 is identical with the tunnel ends number of channel selecting unit U4, in other embodiments also can be inequality.
Channel selecting unit U4 is connected wherein of many horizontal scanning lines by the selected tunnel ends of address signal ABC, and this previous row sweep trace of the horizontal scanning line that connected by the address output end of the same selected code translator U2 of address signal ABC of horizontal scanning line wherein.For example address signal ABC is 000 o'clock; The address output end Y0 of code translator U2 is selected; The horizontal scanning line that address output end Y0 connects is first horizontal scanning line; The previous row sweep trace of first horizontal scanning line is the 8th horizontal scanning line, so address signal ABC is 000 o'clock, and the tunnel ends I/O 0 of selected channel selecting unit U4 connects the 8th horizontal scanning line.For example address signal ABC is 001 o'clock again; The address output end Y1 of code translator U2 is selected; The horizontal scanning line that address output end Y1 connects is second horizontal scanning line; The previous row sweep trace of second horizontal scanning line is first horizontal scanning line, so address signal ABC is 001 o'clock, and the tunnel ends I/O 1 of selected channel selecting unit U4 connects first horizontal scanning line.Notice that this instructions and " previous row sweep trace " described in the claim are meant the horizontal scanning line prior to the last time cycle conducting of the horizontal scanning line of reference.
As shown in Figure 1, the output terminal COM of channel selecting unit U4 is through discharge resistance R3 ground connection.Therefore; When address signal ABC chooses a horizontal scanning line conducting through code translator U2; The same time of address signal ABC is chosen the previous row sweep trace of the horizontal scanning line that code translator U2 chooses through channel selecting unit U4; The discharge resistance R3 that its output terminal COM that passes through channel selecting unit U4 is connected discharges over the ground, has therefore accelerated the velocity of discharge, has eliminated dark bright phenomenon.And other is not unaffected by the horizontal scanning line that address signal ABC chooses, and can not increase the power consumption of circuit, and can promote the security of circuit.
In the embodiment shown in fig. 1, code translator U2 adopts three or eight code translator 74HC138, and channel selecting unit U4 adopts CD4051.Each code translator U2 is connected eight horizontal scanning lines with channel selecting unit U4.The the 0th to the 7th address output end of code translator U2 (first to the 8th horizontal scanning line that is linked in sequence respectively of Y0～Y7).The the 0th to the 6th tunnel ends (IO 0～IO 6) of channel selecting unit U4 second to the 8th horizontal scanning line that is linked in sequence respectively, the 7th tunnel ends IO 7 of channel selecting unit connects first horizontal scanning line.
Every horizontal scanning line includes switching device and LED.The control end of switching device connects the corresponding address output end of code translator U2, and first end of switching device connects power end, and second end of switching device connects the positive pole of LED.In a preferred embodiment, switching device is one the one a P channel MOS tube, and control end is the grid of a P channel MOS tube, and first end is the source electrode of a P channel MOS tube, and second end is the drain electrode of a P channel MOS tube.
In the embodiment shown in fig. 1, a P channel MOS tube adopts two P-channel enhancement type metal-oxide-semiconductor field effect transistor CEM4953, i.e. the integrated chip of two PMOSFET.
In the embodiment shown in fig. 1, the LED sweep circuit comprises monostalbe trigger U1A, with protection code translator U2.In the present embodiment, monostalbe trigger U1A adopts 74HC123.The non-end of the Q of monostalbe trigger U1A connects first Enable Pin of code translator U2, and second Enable Pin of code translator U2 connects latch signal input end STR.
The LED sweep circuit also comprises the 2nd P channel MOS tube Q1.The grid of the 2nd P channel MOS tube Q1 connects latch signal input end STR; The high signal input live end INH of the drain electrode interface channel selected cell of the 2nd P channel MOS tube Q1 and the 3rd Enable Pin of code translator U2; And connect power end, the source ground of the 2nd P channel MOS tube Q1 through current-limiting resistance R2.
Above-mentioned LED sweep circuit is in when work, controls the switch of the 2nd P channel MOS tube Q1 through latch signal, makes the switching signal of the 2nd P channel MOS tube Q1 control enabling of code translator U2 and channel selecting unit U4 simultaneously.When address signal ABC is added to code translator U2 and road selected cell U4 simultaneously; Code translator U2 decoding address output terminal Y0 is low effectively output; First horizontal scanning line is opened, and the tunnel ends I/O 0 of corresponding channel selecting unit U4 opens over the ground simultaneously, thereby bleeds off the residual charge of the 8th horizontal scanning line.In like manner, when second horizontal scanning line was opened, the tunnel ends I/O 1 of corresponding channel selecting unit U4 opened over the ground, thereby bled off the residual charge of first row, thereby had eliminated the dark bright phenomenon of previous row.
The above embodiment has only expressed several kinds of embodiments of the utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to the protection domain of the utility model.Therefore, the protection domain of the utility model patent should be as the criterion with accompanying claims.
Claims (9)
1. a LED sweep circuit comprises code translator, many horizontal scanning lines that are connected with said code translator, it is characterized in that, also comprises the channel selecting unit; Said channel selecting unit and said code translator shared address signal; The tunnel ends of being chosen by said address signal of said channel selecting unit connects wherein of said many horizontal scanning lines, and the previous row sweep trace of the horizontal scanning line that connects of the address output end of the code translator chosen by same said address signal of said wherein horizontal scanning line; The output terminal of said channel selecting unit is through discharge resistance ground connection.
2. LED sweep circuit according to claim 1; It is characterized in that; The address signal input end number of said code translator is identical with the address signal input end number of said channel selecting unit, and the address output end number of said code translator is identical with the tunnel ends number of said channel selecting unit.
3. LED sweep circuit according to claim 2; It is characterized in that; Said code translator is three or eight code translators, and each said three or eight code translator is connected eight horizontal scanning lines with the channel selecting unit, the 0th to the 7th address output end of said three or eight code translators first to the 8th horizontal scanning line that is linked in sequence respectively; The the 0th to the 6th tunnel ends of said channel selecting unit second to the 8th horizontal scanning line that is linked in sequence respectively, the 7th tunnel ends of said channel selecting unit connects first horizontal scanning line.
4. LED sweep circuit according to claim 3 is characterized in that, the model of said three or eight code translators is 74HC138, and the model of said channel selecting unit is CD4051.
5. LED sweep circuit according to claim 2; It is characterized in that; Every said horizontal scanning line includes switching device and LED; The control end of said switching device connects the corresponding address output end of said code translator, and first end of said switching device connects power end, and second end of said switching device connects the positive pole of said LED.
6. LED sweep circuit according to claim 5; It is characterized in that said switching device is a P channel MOS tube, said control end is the grid of a P channel MOS tube; Said first end is the source electrode of a P channel MOS tube, and said second end is the drain electrode of a P channel MOS tube.
7. LED sweep circuit according to claim 1 is characterized in that, comprises monostalbe trigger, and the non-end of the Q of said monostalbe trigger connects the Enable Pin of said code translator.
8. LED sweep circuit according to claim 7 is characterized in that, the model of said monostalbe trigger is 74HC123.
9. LED sweep circuit according to claim 1; It is characterized in that; Comprise the 2nd P channel MOS tube; The grid of said the 2nd P channel MOS tube connects the latch signal input end, and the drain electrode of said the 2nd P channel MOS tube connects the high signal input live end of said channel selecting unit and connects power end, the source ground of said the 2nd P channel MOS tube through current-limiting resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200202669U CN202549245U (en) | 2012-01-17 | 2012-01-17 | LED (Light Emitting Diode) scanning circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200202669U CN202549245U (en) | 2012-01-17 | 2012-01-17 | LED (Light Emitting Diode) scanning circuit |
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| CN202549245U true CN202549245U (en) | 2012-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012200202669U Expired - Fee Related CN202549245U (en) | 2012-01-17 | 2012-01-17 | LED (Light Emitting Diode) scanning circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103646628A (en) * | 2013-11-22 | 2014-03-19 | 无锡莱吉特信息科技有限公司 | Blanking circuit |
| CN104486887A (en) * | 2014-12-23 | 2015-04-01 | 上海斐讯数据通信技术有限公司 | Control device and control method of LED (light-emitting diode) lamps of ports of Ethernet exchange |
| CN104952393A (en) * | 2015-06-30 | 2015-09-30 | 苏州合欣美电子科技有限公司 | Blanking circuit |
| CN104992675A (en) * | 2015-07-30 | 2015-10-21 | 西安诺瓦电子科技有限公司 | Led lamp panel |
| CN111079167A (en) * | 2019-12-22 | 2020-04-28 | 哈尔滨新中新电子股份有限公司 | Hardware circuit encryption device realized through CPLD |
| CN111090893A (en) * | 2019-12-22 | 2020-05-01 | 哈尔滨新中新电子股份有限公司 | Hardware circuit encryption method |
| CN112770443A (en) * | 2021-01-27 | 2021-05-07 | 江苏广中电子科技有限公司 | Method for solving abnormal dark and bright of light emitting diode during scanning |
-
2012
- 2012-01-17 CN CN2012200202669U patent/CN202549245U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103646628A (en) * | 2013-11-22 | 2014-03-19 | 无锡莱吉特信息科技有限公司 | Blanking circuit |
| CN103646628B (en) * | 2013-11-22 | 2016-05-25 | 国家电网公司 | A kind of blanking circuit |
| CN104486887A (en) * | 2014-12-23 | 2015-04-01 | 上海斐讯数据通信技术有限公司 | Control device and control method of LED (light-emitting diode) lamps of ports of Ethernet exchange |
| CN104952393A (en) * | 2015-06-30 | 2015-09-30 | 苏州合欣美电子科技有限公司 | Blanking circuit |
| CN104992675A (en) * | 2015-07-30 | 2015-10-21 | 西安诺瓦电子科技有限公司 | Led lamp panel |
| CN111079167A (en) * | 2019-12-22 | 2020-04-28 | 哈尔滨新中新电子股份有限公司 | Hardware circuit encryption device realized through CPLD |
| CN111090893A (en) * | 2019-12-22 | 2020-05-01 | 哈尔滨新中新电子股份有限公司 | Hardware circuit encryption method |
| CN111079167B (en) * | 2019-12-22 | 2023-06-16 | 哈尔滨新中新电子股份有限公司 | Hardware circuit encryption device realized through CPLD |
| CN112770443A (en) * | 2021-01-27 | 2021-05-07 | 江苏广中电子科技有限公司 | Method for solving abnormal dark and bright of light emitting diode during scanning |
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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 |
Granted publication date: 20121121 Termination date: 20170117 |
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| CF01 | Termination of patent right due to non-payment of annual fee |