CN202771776U - LED (Light-emitting diode) display screen control circuit with blanking function - Google Patents
LED (Light-emitting diode) display screen control circuit with blanking function Download PDFInfo
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- CN202771776U CN202771776U CN2012204735573U CN201220473557U CN202771776U CN 202771776 U CN202771776 U CN 202771776U CN 2012204735573 U CN2012204735573 U CN 2012204735573U CN 201220473557 U CN201220473557 U CN 201220473557U CN 202771776 U CN202771776 U CN 202771776U
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Abstract
The utility model discloses an LED display screen control circuit with blanking function. The LED display screen control circuit with blanking function comprises a power supply, a switch module, an LED display module, a display control module and multiple blanking modules, wherein the switch module, the LED display module and the display control module are orderly connected and all powered by the power supply, each blanking module comprises a Zener diode and a pull-down resistor, the pull-down resistor is connected between one path of output end of the switch module and the cathode of the Zener diode, and the anode of the Zener diode is connected with the cathode of the power supply. When the LED display screen control circuit with blanking function disclosed by the utility model works, the positive path of the current is flowing through the switch module, the LED display module and the display control module from the anode of the power supply to form a loop, if an LED lamp needs to be turned off, the residual charges in the circuit are quickly released through the pull-down resistor and the Zener diode in the blanking module, the LED lamp can be turned off quickly so as to avoid formation of shadow, so that the display effect of an LED display screen is improved greatly.
Description
Technical field
The utility model relates to the LED display technical field, relates more specifically to a kind of LED display control circuit with blanking function.
Background technology
Along with the fast development of LED technology, LED display is applied in the daily live and work more and more widely, and the consumer is also more and more higher to the requirement of LED display, and high refresh rate and large scale are that most of user is desired.Yet, the sharpness that high refresh rate and large scale can cause image to show reduces, and the main cause that causes image definition is to have stray capacitance on the line of LED display and the alignment, in the scanning process of being expert at, the maintenance effect of stray capacitance will form ghost so that LED keeps state before and forms ghost when the pixel of gun is arranged on the picture.Therefore, if the electric current blanking can't be well controlled, smear then can occur and show phenomenon, have a strong impact on the sharpness of image.
Given this, the circuit that is used for LED display need to have good blanking function and eliminate shadow, improves the display screen image quality, and alleviates simultaneously " caterpillar " phenomenon that may cause, reduces the loss to the LED lamp.
The utility model content
The purpose of this utility model provides a kind of LED display control circuit with blanking function eliminating shadow and to reduce the loss of LED lamp, thereby improves the display effect of LED display.
To achieve these goals, the technical solution adopted in the utility model is: a kind of LED display control circuit with blanking function is provided, it comprises power supply, switch module, the LED display module, the a plurality of blanking modules of display control module, described switch module, LED display module and display control module link to each other and successively by described Power supply, and each described blanking module comprises a Zener diode and a drop-down resistance, described pull down resistor is connected between the negative pole of one road output terminal of described switch module and Zener diode, and the positive pole of described Zener diode links to each other with the negative pole of power supply.
Its further technical scheme is: described switch module comprises a plurality of switching tubes, described LED display module comprises a plurality of LED lamps that matrix form connects, described display control module comprises shift register, wherein, the gate pole of a plurality of described switching tubes is controlled by external control switch, the input end of a plurality of described switching tubes all is connected to the positive pole of power supply, the output terminal of a plurality of described switching tubes links to each other with the positive pole of multirow LED lamp respectively and links to each other with pull down resistor in a plurality of blanking modules respectively, and is connected to the different input ends of described shift register with the negative pole of the LED lamp of delegation.
Its further technical scheme is: described switching tube is P type field effect transistor, and the source electrode of this P type field effect transistor is input end, and its grid is output terminal.
Compared with prior art; LED display control circuit with blanking function disclosed in the utility model adopts Zener diode and pull down resistor jointly to form the blanking circuit module; when turn-offing the LED lamp; electric charge remaining in the circuit is via pull down resistor; Zener diode discharges rapidly; avoid causing shadow because remaining electric charge continues positive flow through the LED lamp; simultaneously since Zener diode be in the reverse breakdown duty; can share part voltage; and then larger reduction is switched at a high speed the surging that causes to the damage of LED lamp because of circuit; protection LED lamp; also therefore reduce simultaneously leakage current; reduce probability and its brightness of reduction that " caterpillar " phenomenon occurs, thereby can greatly improve the display effect of LED display.
By following description also by reference to the accompanying drawings, it is more clear that the utility model will become, and these accompanying drawings are used for explaining embodiment of the present utility model.
Description of drawings
Fig. 1 is the circuit theory diagrams that the utlity model has the LED display control circuit of blanking function.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the embodiment is clearly and completely described, assembly label identical in the accompanying drawing represents identical assembly.Obviously, below only be the utility model part embodiment with the embodiment that describes, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
With reference to Fig. 1, the LED display control circuit with blanking function of present embodiment comprises power supply 11, switch module 12, LED display module 13 and display control module 14, and described switch module 12, LED display module 13 and display control module 14 link to each other successively and power by described power supply 11.
In the present embodiment, described switch module 12 comprises switch transistor T 1 ~ T4, and each switching tube is all selected P type field effect transistor, and the source electrode of this P type field effect transistor is input end, and its grid is output terminal.Described LED display module 13 comprises a plurality of LED lamp D1 ~ D16 that matrix form connects, and described display control module 14 is realized by the shift register of four-input terminal.Particularly, LED display module 13 comprises the four lines LED lamp that is controlled by respectively four switch transistor T 1 ~ T4, and every delegation is comprised of four LED lamps.Wherein, the gate pole of all switch transistor T 1 ~ T4 all is connected to an external control switch 16 and is controlled by this external control switch 16, and its input end all is connected to the positive pole of power supply 11.And the output terminal of switch transistor T 1 ~ T4 links to each other with the positive pole of multirow LED lamp respectively, and for example the output terminal of switch transistor T 1 is connected with LED lamp D1 ~ D4 simultaneously, and with the LED lamp of delegation for example the negative pole of D1 ~ D4 be connected to the different input ends of described shift register.
For circuit is realized the blanking effect, LED display control circuit of the present utility model is provided with the blanking module, and is corresponding with switching tube and LED lamp, and present embodiment is provided with four blanking modules 15, and each blanking module 15 comprises Zener diode D and pull down resistor R.Particularly, the concrete circuit connecting relation of explanation as an example of the blanking module 15 that links to each other with switch transistor T 1 example: the pull down resistor R in the blanking module 15 is connected between the negative pole of the output terminal of switch transistor T 1 and Zener diode D, and the positive pole of this Zener diode D links to each other with the negative pole of power supply 11.
Based on the design of foregoing circuit, lighting when LED display is LED lamp when work, and the forward approach of electric current forms the loop for the field effect transistor of flowing through by positive source, LED lamp and shift register, and the LED lamp can normally be lighted; When turn-offing the LED lamp; electric charge remaining in the circuit discharges rapidly via pull down resistor, Zener diode; avoid causing shadow because remaining electric charge continues positive flow through the LED lamp; simultaneously since Zener diode be in the reverse breakdown duty; can share part voltage, and then larger reduction is switched at a high speed the surging that causes to the damage of LED lamp, protection LED lamp because of circuit; also therefore reduce leakage current simultaneously, reduce probability and its brightness of reduction that " caterpillar " phenomenon occurs.
As mentioned above, disclosed in the utility model have the LED display control circuit of blanking function by adopting the common blanking circuit module that forms of Zener diode and pull down resistor effectively to eliminate shadow and reduce the probability that damages the LED lamp, thereby can greatly improve the display effect of LED display, bring good economic benefit and social benefit.
Abovely in conjunction with most preferred embodiment the utility model is described, but the utility model is not limited to the embodiment of above announcement, and should contains various modification, equivalent combinations of carrying out according to essence of the present utility model.
Claims (3)
1. LED display control circuit with blanking function, comprise power supply, switch module, the LED display module, display control module, described switch module, LED display module and display control module link to each other and successively by described Power supply, it is characterized in that: described LED display control circuit also comprises a plurality of blanking modules, each described blanking module comprises a Zener diode and a drop-down resistance, described pull down resistor is connected between the negative pole of one road output terminal of described switch module and Zener diode, and the positive pole of described Zener diode links to each other with the negative pole of power supply.
2. the LED display control circuit with blanking function as claimed in claim 1, it is characterized in that: described switch module comprises a plurality of switching tubes, described LED display module comprises a plurality of LED lamps that matrix form connects, described display control module comprises shift register, wherein, the gate pole of a plurality of described switching tubes is controlled by external control switch, the input end of a plurality of described switching tubes all is connected to the positive pole of power supply, the output terminal of a plurality of described switching tubes links to each other with the positive pole of multirow LED lamp respectively and links to each other with pull down resistor in a plurality of blanking modules respectively, and is connected to the different input ends of described shift register with the negative pole of the LED lamp of delegation.
3. the LED display control circuit with blanking function as claimed in claim 1, it is characterized in that: described switching tube is P type field effect transistor, and the source electrode of this P type field effect transistor is input end, and its grid is output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204735573U CN202771776U (en) | 2012-09-17 | 2012-09-17 | LED (Light-emitting diode) display screen control circuit with blanking function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204735573U CN202771776U (en) | 2012-09-17 | 2012-09-17 | LED (Light-emitting diode) display screen control circuit with blanking function |
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| CN202771776U true CN202771776U (en) | 2013-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012204735573U Expired - Fee Related CN202771776U (en) | 2012-09-17 | 2012-09-17 | LED (Light-emitting diode) display screen control circuit with blanking function |
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| CN (1) | CN202771776U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104392692A (en) * | 2014-12-01 | 2015-03-04 | 苏州立瓷电子技术有限公司 | One-eighth scanning LED display screen resistor blanking circuit |
| CN104409040A (en) * | 2014-12-01 | 2015-03-11 | 苏州立瓷电子技术有限公司 | Eighth scanning LED display screen decoder blanking circuit |
| 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 |
| CN105741755A (en) * | 2016-04-20 | 2016-07-06 | 深圳市明微电子股份有限公司 | LED display screen, display circuit and display control chip thereof |
| CN110415643A (en) * | 2019-08-29 | 2019-11-05 | 南京浣轩半导体有限公司 | A kind of adaptive elimination LED ghost and coupling and the circuit and method of protecting self-test |
| WO2019227901A1 (en) * | 2018-05-31 | 2019-12-05 | 京东方科技集团股份有限公司 | Shift register unit and driving method therefor, gate driving circuit, and display device |
| CN110996462A (en) * | 2019-12-30 | 2020-04-10 | 安徽展晖电子科技有限公司 | Linear constant current driving circuit for eliminating induction turn-off residual light |
| WO2020124376A1 (en) * | 2018-12-18 | 2020-06-25 | 京东方科技集团股份有限公司 | Shift register and driving method therefor, gate driving circuit, and display device |
-
2012
- 2012-09-17 CN CN2012204735573U patent/CN202771776U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104392692A (en) * | 2014-12-01 | 2015-03-04 | 苏州立瓷电子技术有限公司 | One-eighth scanning LED display screen resistor blanking circuit |
| CN104409040A (en) * | 2014-12-01 | 2015-03-11 | 苏州立瓷电子技术有限公司 | Eighth scanning LED display screen decoder blanking circuit |
| 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 |
| CN105741755A (en) * | 2016-04-20 | 2016-07-06 | 深圳市明微电子股份有限公司 | LED display screen, display circuit and display control chip thereof |
| WO2019227901A1 (en) * | 2018-05-31 | 2019-12-05 | 京东方科技集团股份有限公司 | Shift register unit and driving method therefor, gate driving circuit, and display device |
| US11176871B2 (en) | 2018-05-31 | 2021-11-16 | Hefei Xinsheng Optoelectronics Technology Co., Ltd. | Shift register unit and driving method thereof, gate driving circuit and display device |
| WO2020124376A1 (en) * | 2018-12-18 | 2020-06-25 | 京东方科技集团股份有限公司 | Shift register and driving method therefor, gate driving circuit, and display device |
| CN111788624A (en) * | 2018-12-18 | 2020-10-16 | 京东方科技集团股份有限公司 | Shift register and driving method thereof, grid driving circuit and display device |
| CN110415643A (en) * | 2019-08-29 | 2019-11-05 | 南京浣轩半导体有限公司 | A kind of adaptive elimination LED ghost and coupling and the circuit and method of protecting self-test |
| CN110996462A (en) * | 2019-12-30 | 2020-04-10 | 安徽展晖电子科技有限公司 | Linear constant current driving circuit for eliminating induction turn-off residual light |
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| 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: 20130306 Termination date: 20150917 |
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| EXPY | Termination of patent right or utility model |