CN104252840A - Driving circuit - Google Patents
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- CN104252840A CN104252840A CN201410460530.4A CN201410460530A CN104252840A CN 104252840 A CN104252840 A CN 104252840A CN 201410460530 A CN201410460530 A CN 201410460530A CN 104252840 A CN104252840 A CN 104252840A
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Abstract
The invention discloses a driving circuit, which is applied to a display device. The driving circuit comprises a master control chip, a DC-DC (Direct Current) chip, an external circuit and an electric control switch, wherein the DC-DC chip is connected with the master control chip, and the DC-DC chip can output a working voltage required by the master control chip to the master control chip when the DC-DC chip is in a working state; the external circuit is used for outputting the working voltage, and the electric control switch is connected between the master control chip and the external circuit in series; when the electric control switch is in an on state, the external circuit can output the working voltage to the master control chip; when the electric control switch is in an off state, the external circuit cannot output the working voltage to the master control chip; the master control chip is used for controlling the electric control switch to be in the on state and controlling the DC-DC chip to be in a non-working state when an LED (Light Emitting Diode) display is positioned in a standby state.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of driving circuit.
Background technology
Along with growth in the living standard, people focus on the environmental protection and energy saving characteristic of electronic product more, the aspect such as efficiency grade, TCO (Swedish Federation of Professional Employees, career employee association of Sweden) certification buying electronic product is paid close attention to more.But the technical matters of current LED (Light Emitting Diode, light emitting diode) display ubiquity stand-by power consumption higher (generally all between 0.3W ~ 0.5W), causes the waste of the energy.
Summary of the invention
The embodiment of the present application, by providing a kind of driving circuit, solves light-emitting diode display in prior art and there is the higher technical matters of stand-by power consumption.
The application provides following technical scheme by an embodiment of the application:
A kind of driving circuit, be applied in display device, described driving circuit, comprising:
Main control chip;
DC-DC chip, is connected with described main control chip, and wherein, when described DC-DC chip is in running order, described DC-DC chip can export operating voltage needed for described main control chip to described main control chip;
External circuits, for exporting described operating voltage;
Electric-controlled switch, be connected between described main control chip and described external circuits, wherein, when described electric-controlled switch is in conducting state, described external circuits can export described operating voltage to described main control chip, when described electric-controlled switch is in off state, described external circuits cannot export described operating voltage to described main control chip;
Wherein, described main control chip is used for when described display device is in holding state, controls described electric-controlled switch and is in conducting state, and controls described DC-DC chip and be in off working state.
Preferably, described DC-DC chip, comprising:
First input end, is connected with power module, and wherein, described power module can export the first voltage;
First output terminal and the second output terminal;
Wherein, described DC-DC chip is used for: obtain described first voltage from described first input end, and be the second voltage by described first voltage transitions, exports described second voltage by described first output terminal; And by first operating voltage of described first voltage transitions needed for described main control chip, and export described first operating voltage by described second output terminal.
Preferably, described driving circuit, also comprises:
Voltage conversion circuit, comprise the second input end and the 3rd output terminal, described second input end is connected with described first output terminal, described voltage conversion circuit is used for: obtain described second voltage by described second input end, and by second operating voltage of described second voltage transitions needed for described main control chip, export described second operating voltage by described 3rd output terminal.
Preferably, described main control chip, comprising:
3rd input end, is connected with described 3rd output terminal, for obtaining described second operating voltage from described voltage conversion circuit;
Four-input terminal, is connected with described second output terminal, for obtaining described first operating voltage from described DC-DC chip.
Preferably, described external circuits, comprising:
5th input end, is connected with described power module, for obtaining described first voltage from described power module;
3rd output terminal, is connected with described four-input terminal by described electric-controlled switch;
Wherein, when described electric-controlled switch conducting, described external circuits can obtain described first voltage by described 5th input end, and is described first operating voltage by described first voltage transitions, exports described first operating voltage by described 3rd output terminal to described main control chip.
Preferably, described electric-controlled switch, is specially: field effect transistor.
Preferably, described main control chip, also comprises:
One I/O pin, is connected with the Enable Pin of described DC-DC chip;
2nd I/O pin, is connected with the control end of described field effect transistor;
Wherein, described main control chip, specifically for: when described display device is in holding state, by the Enable Pin output shutdown signal of a described I/O pin to described DC-DC chip, be in off state to control described DC-DC chip; And export Continuity signal by described 2nd I/O pin to described field effect transistor, be in conducting state to control described field effect transistor.
Preferably, described main control chip, also comprises:
Internal conversion circuit, is encapsulated in described main control chip inner, and is connected between described 3rd input end and described four-input terminal;
Wherein, described internal conversion circuit is used for: when described display device is in holding state, obtain described first operating voltage from described 3rd input end, described first operating voltage is converted to described second operating voltage, and export described second operating voltage to described four-input terminal.
The one or more technical schemes provided in the embodiment of the present application, at least have following technique effect or advantage:
In the embodiment of the present application, disclose a kind of driving circuit, be applied in display device (such as: light-emitting diode display), described driving circuit, comprising: main control chip; DC-DC chip, is connected with described main control chip, and wherein, when described DC-DC chip is in running order, described DC-DC chip can export operating voltage needed for described main control chip to described main control chip; External circuits, for exporting described operating voltage; Electric-controlled switch, be connected between described main control chip and described external circuits, wherein, when described electric-controlled switch is in conducting state, described external circuits can export described operating voltage to described main control chip, when described electric-controlled switch is in off state, described external circuits cannot export described operating voltage to described main control chip; Wherein, described main control chip is used for when described display device is in holding state, controls described field effect transistor and is in conducting state, and controls described DC-DC chip and be in off working state.Due to when light-emitting diode display is in standby mode, close DC-DC chip, make the no longer power consumption of DC-DC chip, so, efficiently solve light-emitting diode display in prior art and there is the higher technical matters of stand-by power consumption, achieve and reduce the power consumption of light-emitting diode display when holding state, the technique effect of energy-conserving and environment-protective.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of driving circuit in prior art;
Fig. 2 is the schematic diagram of driving circuit in the embodiment of the present application.
Embodiment
The embodiment of the present application, by providing a kind of driving circuit, solves light-emitting diode display in prior art and there is the higher technical matters of stand-by power consumption.
Before introducing the driving circuit in the embodiment of the present application, first the technical matters of driving circuit of the prior art and existence thereof is introduced as follows:
As shown in Figure 1, Fig. 1 is the schematic diagram of driving circuit in prior art, this circuit application is in light-emitting diode display, mainly comprise: main control chip and DC-DC chip, wherein, main control chip is as the kernel control chip of light-emitting diode display, and the image being responsible for light-emitting diode display exports and brightness regulation etc.Main control chip has two power pin (that is: pin one 7 and pin one 6), obtains 1.2V voltage at pin one 7, and when pin one 6 obtains 3.3V voltage, main control chip could normal work.
The pin two 1 (that is: VIN pin) of DC-DC chip is connected with a 14V power module, the 14V voltage transitions that power module exports by DC-DC chip is 5V voltage and 3.3V voltage, and export 5V voltage by pin two 2 (that is: VOUT pin), export 3.3V voltage by pin two 3 (that is: SWL pin).Wherein, the pin two 3 of DC-DC chip is direct-connected with the pin one 6 of main control chip, for exporting 3.3V voltage to pin one 6; 5V voltage transitions is 1.2V voltage by a voltage conversion circuit by pin two 2, and exports to the pin one 7 of main control chip.
When light-emitting diode display is in holding state, main control chip needs to keep duty, and in time light-emitting diode display is adjusted to duty when needs, this just needs the pin one 7 of main control chip and pin one 6 to remain power supply state.In the prior art, adopt and the pin two 0 (that is: enable pin) of DC-DC chip is connected high level all the time, make DC-DC chip remain duty, power with the pin one 7 and pin one 6 that are continuously main control chip.Even if this just causes when light-emitting diode display is in holding state, DC-DC chip and main control chip are also in normal operating conditions, and its standby power, between 0.3W ~ 0.5W, exists the technical matters that stand-by power consumption is higher.
The technical scheme of the embodiment of the present application is for solving the problems of the technologies described above, and general thought is as follows:
A kind of driving circuit, be applied in display device, described driving circuit, comprising: main control chip; DC-DC chip, is connected with described main control chip, and wherein, when described DC-DC chip is in running order, described DC-DC chip can export operating voltage needed for described main control chip to described main control chip; External circuits, for exporting described operating voltage; Electric-controlled switch, be connected between described main control chip and described external circuits, wherein, when described electric-controlled switch is in conducting state, described external circuits can export described operating voltage to described main control chip, when described electric-controlled switch is in off state, described external circuits cannot export described operating voltage to described main control chip; Wherein, described main control chip is used for when described display device is in holding state, controls described field effect transistor and is in conducting state, and controls described DC-DC chip and be in off working state.
For making the object of one embodiment of the invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
As shown in Figure 2, present embodiments provide a kind of driving circuit, be applied in display device (such as: light-emitting diode display), comprise:
Main control chip;
DC-DC chip, is connected with described main control chip, and wherein, when described DC-DC chip is in running order, described DC-DC chip can export operating voltage needed for described main control chip to described main control chip;
External circuits, for exporting described operating voltage;
Electric-controlled switch, be connected between described main control chip and described external circuits, wherein, when described electric-controlled switch is in conducting state, described external circuits can export described operating voltage to described main control chip, when described electric-controlled switch is in off state, described external circuits cannot export described operating voltage to described main control chip;
Wherein, described main control chip is used for when described display device is in holding state, controls described field effect transistor and is in conducting state, and controls described DC-DC chip and be in off working state.
For example, described display device is specifically as follows light-emitting diode display, comprising:
Display panel, is connected with described main control chip, under the control of described main control chip, and output image;
Backlight module, is arranged on after described display panel, is connected with described main control chip, under the control of described main control chip, regulates the brightness of backlight;
Shell, is arranged on described display panel, described backlight module, and described driving circuit is outside, plays the effect of protection.
In specific implementation process, when described light-emitting diode display is in running order, described backlight module normal luminous under the control of described main control chip, when described light-emitting diode display is in holding state, described backlight module is not luminous under the control of described main control chip.
For example, described electric-controlled switch, is specifically as follows: field effect transistor or other controllable electronic switch.
Further, described DC-DC chip, comprising:
First input end 21, is connected with power module, and wherein, described power module can export the first voltage;
First output terminal 22 and the second output terminal 23;
Wherein, described DC-DC chip is used for: obtain described first voltage from described first input end 21, and is the second voltage by described first voltage transitions, exports described first voltage by described first output terminal 22; And by first operating voltage of described first voltage transitions needed for described main control chip, and export described first operating voltage by described second output terminal 23.
For example, the first input end 21 (that is: VIN pin) of DC-DC chip connects power module, and obtain the first voltage (that is: 14V voltage) from this power module, by the voltage transitions of DC-DC, export the second voltage (that is: 5V voltage) by the first output terminal 22 (that is: VOUT pin), export the first operating voltage (that is: 3.3V voltage) needed for main control chip by the second output terminal 23 (that is: SWL pin).
Further, described driving circuit, also comprises:
Voltage conversion circuit, comprise the second input end 24 and the 3rd output terminal 25, described second input end is connected with described first output terminal 22, described voltage conversion circuit is used for: obtain described second voltage by described second input end 24, by second operating voltage of described second voltage transitions needed for described main control chip, and export described second operating voltage by described 3rd output terminal 25.
For example, second input end 24 of described voltage conversion circuit is connected with the first output terminal 22 (that is: VOUT pin) of DC-DC chip, described voltage conversion circuit is used for: the second voltage (that is: 5V voltage) being obtained the output of DC-DC chip by described second input end 24, second voltage (that is: 5V voltage) is converted to the second operating voltage (that is: 1.2V voltage) needed for main control chip, and exports the second operating voltage (that is: 1.2V voltage) by the 3rd output 25 ends.
Further, described main control chip, comprising:
3rd input end 17, is connected with the 3rd output terminal 25, for obtaining the second operating voltage from voltage conversion circuit;
Four-input terminal 16, is connected with the second output terminal 23, for obtaining the first operating voltage from DC-DC chip.
For example, described main control chip obtains the second operating voltage (that is: 1.2V voltage) needed for main control chip by the 3rd input end 17 from the 3rd output terminal 25 of voltage conversion circuit, and obtains the first operating voltage (that is: 3.3V voltage) needed for main control chip by four-input terminal 16 from the second output terminal 23 (that is: SWL pin) of DC-DC chip.
Further, described external circuits, comprising:
5th input end 11, is connected with described power module, for obtaining described first voltage from described power module;
3rd output terminal 12, is connected with described four-input terminal 16 by described field effect transistor;
Wherein, when described field effect transistor conducting, described external circuits can obtain described first voltage by described 5th input end 11, is described first operating voltage by described first voltage transitions, and exports described first operating voltage by described 3rd output terminal 14 to described main control chip.
For example, external circuits obtains first voltage (that is: 14V) of power module output by the 5th input end 11, and the first operating voltage (that is: 3.3V voltage) be converted to by the first voltage (that is: 14V) needed for main control chip, then export the first operating voltage (that is: 3.3V voltage) by the 3rd output terminal 12.And, a field effect transistor is in series with between external circuits and main control chip, particularly, the drain electrode input end 13 of field effect transistor is connected with the 3rd output terminal 12 of external circuits, and the source electrode output terminal 14 of field effect transistor is connected with the four-input terminal 16 of main control chip.
Further, described main control chip, also comprises:
One I/O pin one 8, is connected with the Enable Pin 20 of described DC-DC chip;
2nd I/O pin one 9, is connected with the control end 15 (that is: grid control end) of described field effect transistor;
Wherein, described main control chip, specifically for: when described light-emitting diode display is in holding state, export shutdown signal (such as: low level signal) by a described I/O pin one 8 to the Enable Pin 20 of described DC-DC chip, be in off working state (that is: closed condition) to control described DC-DC chip; And export a Continuity signal by the 2nd I/O pin one 9 to the control end 15 (that is: grid control end) of described field effect transistor, be in conducting state to control described field effect transistor, thus make the four-input terminal 16 that external circuits is main control chip provide the first operating voltage (that is: 3.3V voltage).
Further, described main control chip, also comprises:
Internal conversion circuit, is encapsulated in described main control chip inner, and is connected between described 3rd input end 17 and described four-input terminal 16;
Wherein, described internal conversion circuit is used for: when described light-emitting diode display is in holding state, described first operating voltage (that is: 3.3V voltage) is obtained from described 3rd input end 16, described first operating voltage (that is: 3.3V voltage) is converted to described second operating voltage (that is: 1.2V voltage), and export described second operating voltage (that is: 1.2V voltage) to described four-input terminal 17, with the operating voltage making master control chip obtain 3.3V and 1.2V simultaneously, thus be in normal duty.
When described light-emitting diode display needs to return to duty from holding state, the backlight module that main control chip controls light-emitting diode display is luminous, and send enable signal (that is: high level signal) by an I/O pin one 8 to the Enable Pin 20 of DC-DC, to make DC-DC chip resume work state, thus provide the operating voltage of 1.2V and 3.3V to main control chip; And main control chip sends a cut-off signals by an I/O pin one 9 to the Enable Pin 15 (that is: grid control end) of field effect transistor, to turn off field effect transistor, thus external circuits is stopped to main control chip output services voltage.Due to, DC-DC chip has the high advantage of electric energy conversion efficiency, when light-emitting diode display resumes work state, adopts DC-DC chip to be that main control chip is powered, can improve the utilization ratio of the energy.
Technical scheme in above-mentioned the embodiment of the present application, at least has following technique effect or advantage:
In the embodiment of the present application, due to when light-emitting diode display is in standby mode, close DC-DC chip, make the no longer power consumption of DC-DC chip, and the electric current flowing through main control chip only has tens microamperes, main control chip overall power is close to 0W, so, efficiently solve light-emitting diode display in prior art and there is the higher technical matters of stand-by power consumption, achieve and reduce the power consumption of light-emitting diode display when holding state, the technique effect of energy-conserving and environment-protective.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (8)
1. a driving circuit, is applied in display device, it is characterized in that, described driving circuit, comprising:
Main control chip;
DC-DC chip, is connected with described main control chip, and wherein, when described DC-DC chip is in running order, described DC-DC chip can export operating voltage needed for described main control chip to described main control chip;
External circuits, for exporting described operating voltage;
Electric-controlled switch, be connected between described main control chip and described external circuits, wherein, when described electric-controlled switch is in conducting state, described external circuits can export described operating voltage to described main control chip, when described electric-controlled switch is in off state, described external circuits cannot export described operating voltage to described main control chip;
Wherein, described main control chip is used for when described display device is in holding state, controls described electric-controlled switch and is in conducting state, and controls described DC-DC chip and be in off working state.
2. driving circuit as claimed in claim 1, it is characterized in that, described DC-DC chip, comprising:
First input end, is connected with power module, and wherein, described power module can export the first voltage;
First output terminal and the second output terminal;
Wherein, described DC-DC chip is used for: obtain described first voltage from described first input end, and be the second voltage by described first voltage transitions, exports described second voltage by described first output terminal; And by first operating voltage of described first voltage transitions needed for described main control chip, and export described first operating voltage by described second output terminal.
3. driving circuit as claimed in claim 2, it is characterized in that, described driving circuit, also comprises:
Voltage conversion circuit, comprise the second input end and the 3rd output terminal, described second input end is connected with described first output terminal, described voltage conversion circuit is used for: obtain described second voltage by described second input end, and by second operating voltage of described second voltage transitions needed for described main control chip, export described second operating voltage by described 3rd output terminal.
4. driving circuit as claimed in claim 3, it is characterized in that, described main control chip, comprising:
3rd input end, is connected with described 3rd output terminal, for obtaining described second operating voltage from described voltage conversion circuit;
Four-input terminal, is connected with described second output terminal, for obtaining described first operating voltage from described DC-DC chip.
5. driving circuit as claimed in claim 4, it is characterized in that, described external circuits, comprising:
5th input end, is connected with described power module, for obtaining described first voltage from described power module;
3rd output terminal, is connected with described four-input terminal by described electric-controlled switch;
Wherein, when described electric-controlled switch conducting, described external circuits can obtain described first voltage by described 5th input end, and is described first operating voltage by described first voltage transitions, exports described first operating voltage by described 3rd output terminal to described main control chip.
6. the driving circuit as described in as arbitrary in Claims 1 to 5, it is characterized in that, described electric-controlled switch, is specially:
Field effect transistor.
7. driving circuit as claimed in claim 6, it is characterized in that, described main control chip, also comprises:
One I/O pin, is connected with the Enable Pin of described DC-DC chip;
2nd I/O pin, is connected with the control end of described field effect transistor;
Wherein, described main control chip, specifically for: when described display device is in holding state, by the Enable Pin output shutdown signal of a described I/O pin to described DC-DC chip, be in off working state to control described DC-DC chip; And export Continuity signal by described 2nd I/O pin to described field effect transistor, be in conducting state to control described field effect transistor.
8. driving circuit as claimed in claim 7, it is characterized in that, described main control chip, also comprises:
Internal conversion circuit, is encapsulated in described main control chip inner, and is connected between described 3rd input end and described four-input terminal;
Wherein, described internal conversion circuit is used for: when described display device is in holding state, obtain described first operating voltage from described 3rd input end, described first operating voltage is converted to described second operating voltage, and export described second operating voltage to described four-input terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410460530.4A CN104252840B (en) | 2014-09-11 | 2014-09-11 | Driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410460530.4A CN104252840B (en) | 2014-09-11 | 2014-09-11 | Driving circuit |
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| CN104252840A true CN104252840A (en) | 2014-12-31 |
| CN104252840B CN104252840B (en) | 2017-01-18 |
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| CN201410460530.4A Expired - Fee Related CN104252840B (en) | 2014-09-11 | 2014-09-11 | Driving circuit |
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| CN117565845A (en) * | 2024-01-16 | 2024-02-20 | 千顾汽车科技(江苏)有限公司 | EPB drive circuit based on QM pre-drive chip |
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| WO2020143402A1 (en) * | 2019-01-11 | 2020-07-16 | 京东方科技集团股份有限公司 | Strip screen control circuit, strip screen display system, and strip screen control method |
| US11127328B2 (en) | 2019-01-11 | 2021-09-21 | Boe Technology Group Co., Ltd. | Bar screen control circuitry, bar screen display system and method for controlling a bar screen |
| CN110769566A (en) * | 2019-10-23 | 2020-02-07 | 东莞市喜见天能源技术有限公司 | LED driver circuit and working method thereof |
| CN114120927A (en) * | 2021-12-06 | 2022-03-01 | Tcl华星光电技术有限公司 | Backlight module and display device |
| US11996057B2 (en) | 2021-12-06 | 2024-05-28 | Tcl China Star Optoelectronics Technology Co., Ltd. | Backlight module and display device |
| CN117565845A (en) * | 2024-01-16 | 2024-02-20 | 千顾汽车科技(江苏)有限公司 | EPB drive circuit based on QM pre-drive chip |
| CN117565845B (en) * | 2024-01-16 | 2024-04-05 | 千顾汽车科技(江苏)有限公司 | EPB drive circuit based on QM pre-drive chip |
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| CN104252840B (en) | 2017-01-18 |
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