CN201984777U - LED (light-emitting diode) digital tube driving circuit - Google Patents
LED (light-emitting diode) digital tube driving circuit Download PDFInfo
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- CN201984777U CN201984777U CN2011200151605U CN201120015160U CN201984777U CN 201984777 U CN201984777 U CN 201984777U CN 2011200151605 U CN2011200151605 U CN 2011200151605U CN 201120015160 U CN201120015160 U CN 201120015160U CN 201984777 U CN201984777 U CN 201984777U
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Abstract
The utility model discloses an LED (light-emitting diode) digital tube driving circuit, comprising a main control MCU (microprogrammed control unit), an LED digital tube and a digital tube driver, wherein the digital tube driver adopts a CT1642 chip; and the main control MCU is connected with the CT1642 chip by two I/O (input/output) ports, and the LED digital tube is connected with the CT1642 chip. Since the CT1642 internally comprises a bit driving circuit; and bit driving and segment driving to the LED digital tube are realized by the CT1642 chip. Compared with the prior art, in the LED digital tube driving circuit, four bit driving current-expanding triodes are omitted, and the resource occupation of the main control MCU is reduced; and simultaneously, since the CT1642 chip is constant-current driving type, a current limiting circuit is not needed, eight current limiting resistors are omitted, further the cost of materials is greatly saved, and the production efficiency is improved.
Description
Technical field
The utility model relates to technical field of digital television set-top, relates in particular to a kind of LED charactron driving circuit that is applied to set top box front panel.
Background technology
At present, in digital TV set-top box, for ease of man-machine interactive operation, front panel all adopts the LED charactron of one 4 " 8 " words to show that some are simple English and digital usually, and several function buttons commonly used are arranged.Current LED charactron drives and key scan adopts logical device 74HC164 to realize mostly, its circuit theory diagrams such as accompanying drawing 1, mainly comprise: main control MCU, LED charactron, charactron driver, function button circuit, 4 positions drive and expand stream triode, current-limiting circuit (being made up of 8 current-limiting resistances), and charactron driver wherein adopts the 74HC164 chip; Concrete annexation is: main control MCU drives expansion stream triode by the position and is connected with the LED charactron with the position driving COM1～COM4 by the existing LED charactron of 4 I/O causes for gossip, the 74HC164 chip is connected with the LED charactron by current-limiting resistance, the function button circuit is connected with the 74HC164 chip, and main control MCU is connected with the function button circuit with the 74HC164 chip respectively by its 2 I/O mouths and 1 I/O mouth and realizes to the section driving of LED charactron with to the scanning of function button.Need more external component (drive expand stream triode, current-limiting resistance as the position) when adopting this method to realize the driving of LED charactron, and need take 7 I/O mouths of main control MCU, be unfavorable for saving cost like this and enhance productivity.In the epoch of current digital TV set-top box cut-throat competition, Material Cost has determined a competitiveness of product basically, thereby is necessary to propose a kind of new LED charactron driving circuit, with the reduction Material Cost, improves the competitiveness of product in market.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of LED charactron driving circuit, realizes reducing production costs the driving of LED charactron by less external component, enhances productivity.
The technical scheme that its technical matters that solves the utility model adopts is:
A kind of LED charactron driving circuit, this circuit comprises main control MCU, LED charactron and charactron driver, and the charactron driver adopts the CT1642 chip;
Described main control MCU is connected with the CT1642 chip by its 2 I/O mouths, and described LED charactron is connected with the CT1642 chip.
Wherein, also comprise the function button circuit, be connected with the CT1642 chip with described main control MCU respectively.
Wherein, described CT1642 chip internal is integrated with 18 bit shift register, 18 latchs, constant-current drive circuit and upper telegram in reply circuit.
The beneficial effects of the utility model are:
Because CT1642 inside has comprised bit driver circuit, so the utility model is realized the position driving and the section of LED charactron are driven by CT1642, compared with prior art, saved 4 positions and driven expansion stream triode, reduced the resource occupation of main control MCU; Simultaneously,,, saved 8 current-limiting resistances, saved Material Cost greatly, improved production efficiency so no longer need current-limiting circuit because CT1642 is the constant-current driving type.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is a LED charactron driving circuit schematic diagram in the prior art.
The LED charactron driving circuit schematic diagram that Fig. 2 provides for the utility model embodiment.
The CT1642 internal logic block diagram that Fig. 3 provides for the utility model embodiment.
The 1st charactron that Fig. 4 provides for the utility model embodiment shows the oscillogram of " 8 " word.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
See also Fig. 2, LED charactron driving circuit mainly is made up of main control MCU, CT1642, LED charactron, function button circuit in the present embodiment; Wherein,
CT1642 is connected and takies mainboard MCU with main control MCU two I/O mouths, while are connected position driving and the section driving that realizes this LED charactron with the LED charactron;
The function button circuit is connected respectively with CT1642, mainboard MCU, by the driving of CT1642 realization to the function button circuit, by the detection of main control MCU realization to function button.
CT1642 is a integrated circuit based on LED charactron drive controlling, circuit modules such as inner integrated 18 bit shift register, 18 latchs, constant-current drive circuit, electrify restoration circuit, adopt serial (CLK, DATA) communication, only use 2 I/O mouths, can reduce the resource occupation of main control MCU.
The logic function figure of CT1642 mainly is made up of 18 bit shift register, 18 latchs, driving circuit etc. as shown in Figure 3.Concrete principle of work is: from the data-signal of main control MCU output, from DATA end input data, the effect of CLK rising edge next time property 18 bit data are input in 18 bit shift register; Then CLK is changed to 1, opens 18 latchs, the rising edge pulse by DATA end outputs to 18 latchs with the data in 18 bit shift register are disposable, simultaneously because CLK is 1, is output as 0 at the effect d type flip flop of DATA rising edge, and output is closed; Again CLK is changed to 0, closes 18 latchs, under the effect of DATA rising edge, make d type flip flop be output as 1 simultaneously, open 18 latchs of output.Make typical wave mode that first charactron shows " 8 " word as shown in Figure 4, after the 18th pulse of CLK, data are exported by two rising edges of DATA.Realization principle when the scanning theory of function button and prior art adopt 74HC164 is just the same, repeats no more herein.
Comparison diagram 1 and Fig. 2, the utility model adopt CT1642 driving LED charactron, drive C1～C4 because CT1642 inside has comprised the position, expand stream triode and 4 I/O mouths so saved 4 positions drivings; And CT1642 is the constant-current driving type, so no longer need current-limiting circuit, saved 8 current-limiting resistances.
In sum, adopt the utility model, can save Material Cost greatly, enhance productivity, have very high practical value and marketable value.
Above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, only with reference to preferred embodiment the utility model is had been described in detail.Those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement the technical solution of the utility model, and do not break away from the spirit and scope of technical solutions of the utility model, all should be encompassed in the middle of the claim scope of the present utility model.
Claims (3)
1. a LED charactron driving circuit is characterized in that, this circuit comprises main control MCU, LED charactron and charactron driver, and the charactron driver adopts the CT1642 chip;
Described main control MCU is connected with the CT1642 chip by its 2 I/O mouths, and described LED charactron is connected with the CT1642 chip.
2. LED charactron driving circuit as claimed in claim 1 is characterized in that, also comprises the function button circuit, is connected with the CT1642 chip with described main control MCU respectively.
3. LED charactron driving circuit as claimed in claim 1 or 2 is characterized in that, described CT1642 chip internal is integrated with 18 bit shift register, 18 latchs, constant-current drive circuit and upper telegram in reply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200151605U CN201984777U (en) | 2011-01-18 | 2011-01-18 | LED (light-emitting diode) digital tube driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200151605U CN201984777U (en) | 2011-01-18 | 2011-01-18 | LED (light-emitting diode) digital tube driving circuit |
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| Publication Number | Publication Date |
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| CN201984777U true CN201984777U (en) | 2011-09-21 |
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| CN2011200151605U Expired - Fee Related CN201984777U (en) | 2011-01-18 | 2011-01-18 | LED (light-emitting diode) digital tube driving circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013063811A1 (en) * | 2011-11-05 | 2013-05-10 | Liv Runchun | Led digital tube drive circuit in set top box |
| CN104332125A (en) * | 2014-11-13 | 2015-02-04 | 梧州学院 | Nixie tube panel and key control circuit and control method thereof |
| CN104778916A (en) * | 2014-12-02 | 2015-07-15 | 深圳市视维科技有限公司 | All-character LED nixie tube display driving circuit |
| CN106960647A (en) * | 2017-05-24 | 2017-07-18 | 海芯科技(厦门)有限公司 | A kind of energy saving luminous Digitron display driver circuit |
| CN107369403A (en) * | 2017-09-07 | 2017-11-21 | 广东美的暖通设备有限公司 | Button display method and charactron |
| CN113380167A (en) * | 2021-06-15 | 2021-09-10 | 西安微电子技术研究所 | Aerospace-grade nixie tube display driving circuit and application thereof |
-
2011
- 2011-01-18 CN CN2011200151605U patent/CN201984777U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013063811A1 (en) * | 2011-11-05 | 2013-05-10 | Liv Runchun | Led digital tube drive circuit in set top box |
| CN104332125A (en) * | 2014-11-13 | 2015-02-04 | 梧州学院 | Nixie tube panel and key control circuit and control method thereof |
| CN104778916A (en) * | 2014-12-02 | 2015-07-15 | 深圳市视维科技有限公司 | All-character LED nixie tube display driving circuit |
| CN106960647A (en) * | 2017-05-24 | 2017-07-18 | 海芯科技(厦门)有限公司 | A kind of energy saving luminous Digitron display driver circuit |
| CN107369403A (en) * | 2017-09-07 | 2017-11-21 | 广东美的暖通设备有限公司 | Button display method and charactron |
| CN107369403B (en) * | 2017-09-07 | 2020-09-25 | 广东美的暖通设备有限公司 | Key display method and nixie tube |
| CN113380167A (en) * | 2021-06-15 | 2021-09-10 | 西安微电子技术研究所 | Aerospace-grade nixie tube display driving circuit and application thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 518000 Guangdong city of Shenzhen province Nanshan District Yuquanlu Road Yizhe building 7 floor East Patentee after: Shenzhen AOK Polytron Technologies Inc Address before: 518052 Guangdong city of Shenzhen province Nanshan District Yuquanlu Road Yizhe building 7 floor East Patentee before: Shenzhen Sowell Technology Co., Ltd. |
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| CP03 | Change of name, title or address | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110921 Termination date: 20190118 |
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| CF01 | Termination of patent right due to non-payment of annual fee |