CN204257178U - LCD backlight ON-OFF control circuit - Google Patents
LCD backlight ON-OFF control circuit Download PDFInfo
- Publication number
- CN204257178U CN204257178U CN201420591087.XU CN201420591087U CN204257178U CN 204257178 U CN204257178 U CN 204257178U CN 201420591087 U CN201420591087 U CN 201420591087U CN 204257178 U CN204257178 U CN 204257178U
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- China
- Prior art keywords
- circuit
- resistance
- backlight
- control circuit
- source filter
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- Expired - Fee Related
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- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 37
- 230000001052 transient effect Effects 0.000 claims abstract description 15
- 238000004146 energy storage Methods 0.000 claims description 26
- 239000003990 capacitor Substances 0.000 claims description 25
- 238000001914 filtration Methods 0.000 claims description 5
- 238000005457 optimization Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model provides a kind of LCD backlight ON-OFF control circuit, comprise backlight electric power and ON-OFF control circuit, ON-OFF control circuit comprises electric source filter circuit and resistance R82, the input end of electric source filter circuit is connected with backlight electric power, and one end of resistance R82 is connected with the output terminal of electric source filter circuit; In addition, as control signal input end after transient suppressor one end is connected with resistance R65 one end, the resistance R65 other end is connected respectively with resistance R79 one end, transistor base, and the transient suppressor other end, the resistance R79 other end and transistor emitter be ground connection respectively; Transistor collector is connected with the resistance R82 other end, and electric source filter circuit is connected with liquid crystal back light circuit positive pole with the junction of resistance R82, transistor collector is connected with liquid crystal back light circuit negative pole with the junction of resistance R82.When device does not have button operation for a long time or when external power supply interrupts can the liquid crystal back light circuit of disconnecting device automatically to save the energy.
Description
Technical field
The utility model relates to a kind of control circuit, specifically, relates to a kind of LCD backlight ON-OFF control circuit.
Background technology
Liquid crystal display is a kind of liquid crystal that adopts is the display of material.Liquid crystal be between solid-state and liquid between organic compound.Be heated and can become transparent liquid, the muddiness that can become crystallization after cooling is solid-state.Under electric field action, the change that liquid crystal molecule can arrange, thus impact is by its light change, the change of this light can show as the change of light and shade by the effect of polaroid.Like this, people by finally controlling the light and shade change of light to the control of electric field, thus reach the object of display image.
Liquid crystal display due to its thickness thin, quality is light and easy to carry, and demand increases fast in recent years, occupies a tiny space in monitor market.Because liquid crystal itself is not luminous, usually need to provide an external light source, as backlight module shows to realize picture to liquid crystal display.Therefore, the performance of backlight module light source just determines the visual impression that display shows outer to a great extent.At present.Due to the advantage that light emitting diode has in brightness, thermal value etc., the traditional cold cathode tube backlight module applied in liquid crystal display is replaced to LED backlight module by existing manufacturer.Adopt the LCD of LED backlight module, be applied to the electronic installation of various light and thin type gradually, such as mobile phone, notebook computer etc.
Need the power supply of closing liquid crystal back light circuit to reduce plant energy consumption when device does not have button operation or external power supply to interrupt for a long time, must human cost be increased if simple by manually going to operate control, nor can ensure to close timely.In addition, the brightness of LCDs can be caused unstable if the power supply of powering to liquid crystal back light circuit exists disturbance fluctuation, while affecting image quality, also easily damage eyes.
Utility model content
For this reason, technical problem to be solved in the utility model be when device does not have button operation for a long time or external power supply interrupts time still keep LCD backlight lamp still light yellow can waste electric energy, thus propose a kind ofly can automatically disconnect the LCD backlight ON-OFF control circuit of liquid crystal back light circuit when device does not have button operation for a long time or when external power supply interrupts.
For solving the problems of the technologies described above, the utility model provides following technical scheme:
A kind of LCD backlight ON-OFF control circuit, the ON-OFF control circuit comprising backlight electric power and be connected with backlight electric power, ON-OFF control circuit comprises electric source filter circuit and resistance R82, the input end of electric source filter circuit is connected with backlight electric power, and one end of resistance R82 is connected with the output terminal of electric source filter circuit; ON-OFF control circuit also comprises transient suppressor V11, resistance R65, resistance R79 and triode V14, one end of transient suppressor V11 is connected with one end of resistance R65, this junction is as the control signal input end of ON-OFF control circuit, the other end of resistance R65 is connected respectively with the base stage of one end of resistance R79, triode V14, the emitter ground connection respectively of the other end of transient suppressor V11, the other end of resistance R79 and triode V14; The collector of triode V14 is connected with the other end of resistance R82, and electric source filter circuit is connected with the positive pole of liquid crystal back light circuit with the junction of resistance R82, the collector of triode V14 is connected with the negative pole of liquid crystal back light circuit with the junction of resistance R82.
As optimization, backlight electric power is capacitor energy storage circuit, capacitor energy storage circuit comprises the diode V32, mu balanced circuit, current-limiting circuit and the diode V25 that connect successively, the anode of diode V32 is connected with external power supply, negative electrode is connected with mu balanced circuit, diode V25 anode is connected with current-limiting circuit, negative electrode is connected with the electric source filter circuit of ON-OFF control circuit, capacitor energy storage circuit also comprises the energy storage circuit be made up of the energy-storage units circuit of several series connection, and the positive terminal of energy storage circuit is connected with the anode of diode V25, negative pole end ground connection.
As optimization, energy-storage units circuit comprises a super capacitor and resistance, super capacitor and a resistor coupled in parallel.
As optimization, electric source filter circuit is π type filtering circuit, comprise electric capacity C82, inductance L 2 and electric capacity C38, electric capacity C82 is connected with backlight electric power respectively with one end of inductance L 2, electric capacity C82 other end ground connection, the other end of inductance L 2 is connected with one end of electric capacity C38, electric capacity C38 other end ground connection, and the junction of inductance L 2 and electric capacity C38 is as the output terminal of electric source filter circuit.
As optimization, also comprise electric capacity C210, electric capacity C210 is electrochemical capacitor, and the positive pole of electric capacity C210 is connected with the output terminal of electric source filter circuit, minus earth.
As optimization, backlight electric power is energy storage battery.
Technique scheme of the present utility model has the following advantages compared to existing technology:
1, the LCD backlight ON-OFF control circuit that provides of the utility model, the control signal inputted by control signal input end controls conducting and the cut-off of triode V14, liquid crystal back light circuit can be disconnected when device does not have button operation for a long time or when external power supply interrupts, to save the energy, improve the working time of standby power supply, and the triode V14 conducting when liquid crystal back light circuit opened by needs.Thus LCD backlight lamp can be opened or closed as required in time automatically, do not need manually to go operation, save human cost.In addition, this LCD backlight control circuit is provided with electric source filter circuit and large electrochemical capacitor C210, has taken into full account that power-supply fluctuation has done sufficient protection to the interference of backlight illumination.Resistance R82 is in parallel with liquid crystal back light circuit, can limit the electric current that flows through liquid crystal back light circuit thus controls the brightness of backlight and ensure that backlight is not destroyed.
2, the backlight electric power in the LCD backlight ON-OFF control circuit that provides of the utility model is when external power supply is normal, can directly be powered to liquid crystal back light circuit by diode V32, mu balanced circuit, current-limiting circuit and diode V25, have also contemplated that the impact of power-supply fluctuation on liquid crystal back light circuit in backlight electric power circuit equally, be provided with voltage stabilizing current-limiting circuit; If when external power supply interrupts, and when needing to understand the ruuning situation of device by liquid crystal display, the electric energy stored in super capacitor that utilizes that can be of short duration opens liquid crystal back light circuit.
Accompanying drawing explanation
In order to make content of the present utility model be more likely to be clearly understood, below according to specific embodiment of the utility model also by reference to the accompanying drawings, the utility model is described in further detail, wherein
Fig. 1 is a kind of ON-OFF control circuit figure of the utility model embodiment;
Fig. 2 is a kind of backlight electric power circuit diagram of the utility model embodiment.
Embodiment
In order to make those skilled in the art person understand the utility model scheme better, below in conjunction with drawings and Examples, technical scheme provided by the utility model is described in further detail.
The utility model provides a kind of LCD backlight ON-OFF control circuit, the ON-OFF control circuit comprising backlight electric power and be connected with backlight electric power, as shown in Figure 1, ON-OFF control circuit comprises electric source filter circuit and resistance R82, the input end of electric source filter circuit is connected with backlight electric power, and one end of resistance R82 is connected with the output terminal of electric source filter circuit.ON-OFF control circuit also comprises transient suppressor V11, resistance R65, resistance R79 and triode V14, the antistatic effect that transient suppressor V11 can improve device protects triode V14 simultaneously, one end of transient suppressor V11 is connected with one end of resistance R65, this junction is as the control signal input end of ON-OFF control circuit, the other end of resistance R65 is connected respectively with the base stage of one end of resistance R79, triode V14, the emitter ground connection respectively of the other end of transient suppressor V11, the other end of resistance R79 and triode V14; The collector of triode V14 is connected with the other end of resistance R82, and electric source filter circuit is connected with the positive pole of liquid crystal back light circuit with the junction of resistance R82, the collector of triode V14 is connected with the negative pole of liquid crystal back light circuit with the junction of resistance R82.Resistance R82 is in parallel with liquid crystal back light circuit, can limit the electric current that flows through liquid crystal back light circuit thus controls backlight illumination and ensure that liquid crystal back light circuit is not damaged.Resistance R65 can carry out current limliting to the base stage of triode V14, and resistance R79 can ensure that triode V14 can not mislead.Transient diode is a kind of high-effect protection device of diode form.When the two poles of the earth of transient diode are subject to reverse transient state high energy impact events; it can with the speed bearing 12 power second-times of 10; the high impedance of its two interpolar is become Low ESR; absorb the surge power up to thousands of watts; make the voltage clamp of two interpolars in a predetermined value; effectively protect the precision components in electronic circuit, from the damage of various surge pulse.
The Main Function of ON-OFF control circuit for closing backlight electric power to reduce plant energy consumption when not having button operation or external power supply to interrupt for a long time when device, or opens backlight when there being external key to operate.ON-OFF control circuit is controlled by processor, and the control signal of processor is by the control signal input end input switch control circuit of ON-OFF control circuit.When input high level signal, triode V14 conducting, at this moment backlight electric power provides power supply by triode V14 to liquid crystal back light circuit, the negative pole of liquid crystal back light circuit is dragged down, thus voltage difference is produced between the both positive and negative polarity of liquid crystal back light circuit, the LED operation in liquid crystal back light circuit can be made, thus light liquid crystal back light circuit; And when input low level signal, triode V14 ends, liquid crystal back light circuit extinguishes.
Optimally, electric source filter circuit is π type filtering circuit, comprise electric capacity C82, inductance L 2 and electric capacity C38, electric capacity C82 is connected with backlight electric power respectively with one end of inductance L 2, electric capacity C82 other end ground connection, the other end of inductance L 2 is connected with one end of electric capacity C38, electric capacity C38 other end ground connection, and the junction of inductance L 2 and electric capacity C38 is as the output terminal of electric source filter circuit.
Optimally, also comprise electric capacity C210, electric capacity C210 be electrochemical capacitor as power supply storage capacitor, the positive pole of electric capacity C210 is connected with the output terminal of electric source filter circuit, minus earth.Meanwhile, also filtering can be carried out to backlight electric power.
Optimally, also comprise electric capacity C31, one end of electric capacity C31 is connected with the base stage of triode V14, other end ground connection.Electric capacity C31 and resistance R65 forms filtering circuit to improve the antijamming capability of ON-OFF control circuit.
As shown in Figure 2, backlight electric power in this enforcement is capacitor energy storage circuit, capacitor energy storage circuit comprises the diode V32, mu balanced circuit, current-limiting circuit and the diode V25 that connect successively, the anode of diode V32 is connected with external power supply, negative electrode is connected with mu balanced circuit, and diode V32 effect is for preventing capacitance current from pouring in down a chimney in external power supply circuit when preventing external power source from interrupting.Diode V25 anode is connected with current-limiting circuit, negative electrode is connected with the electric source filter circuit of ON-OFF control circuit, capacitor energy storage circuit also comprises the energy storage circuit be made up of the energy-storage units circuit of several series connection, and the positive terminal of energy storage circuit is connected with the anode of diode V25, negative pole end ground connection.Particularly, energy-storage units circuit comprises a super capacitor in parallel and a resistance.And the resistance of all energy-storage units circuit and the size of super capacitor all consistent.The substitutional resistance be also connected with super capacitor is mainly in order to ensure that the both end voltage of super capacitor is consistent, in order to avoid voltage inequality causes super capacitor local superpotential and damages.Super capacitor series aiding connection in energy storage circuit.As optimization, the present embodiment also comprises electric capacity C49, and one end of electric capacity C49 is connected with the negative pole of diode V32, other end ground connection.Current-limiting circuit is made up of resistance R14 and R15 parallel connection, can anti-locking apparatus when starting electric current excessive, cause installation's power source normally to start.
One as the present embodiment is out of shape, and backlight electric power is energy storage battery.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain that the utility model creates.
Claims (6)
1. a LCD backlight ON-OFF control circuit, the ON-OFF control circuit comprising backlight electric power and be connected with backlight electric power, is characterized in that:
Described ON-OFF control circuit comprises electric source filter circuit and resistance R82, and the input end of described electric source filter circuit is connected with described backlight electric power, and described one end of resistance R82 is connected with the output terminal of electric source filter circuit;
Described ON-OFF control circuit also comprises transient suppressor V11, resistance R65, resistance R79 and triode V14, one end of described transient suppressor V11 is connected with one end of described resistance R65, this junction is as the control signal input end of ON-OFF control circuit, the other end of described resistance R65 is connected respectively with the base stage of one end of described resistance R79, described triode V14, the emitter ground connection respectively of the other end of described transient suppressor V11, the other end of described resistance R79 and described triode V14;
The collector of described triode V14 is connected with the other end of described resistance R82, and described electric source filter circuit is connected with the positive pole of liquid crystal back light circuit with the described junction of resistance R82, the collector of described triode V14 is connected with the negative pole of liquid crystal back light circuit with the described junction of resistance R82.
2. LCD backlight ON-OFF control circuit as claimed in claim 1, it is characterized in that, described backlight electric power is capacitor energy storage circuit, described capacitor energy storage circuit comprises the diode V32 connected successively, mu balanced circuit, current-limiting circuit and diode V25, the anode of described diode V32 is connected with external power supply, negative electrode is connected with described mu balanced circuit, described diode V25 anode is connected with described current-limiting circuit, negative electrode is connected with the electric source filter circuit of described ON-OFF control circuit, described capacitor energy storage circuit also comprises the energy storage circuit be made up of the energy-storage units circuit of several series connection, the positive terminal of described energy storage circuit is connected with the anode of diode V25, negative pole end ground connection.
3. LCD backlight ON-OFF control circuit as claimed in claim 2, it is characterized in that, described energy-storage units circuit comprises a super capacitor and a resistance, described super capacitor and resistor coupled in parallel.
4. LCD backlight ON-OFF control circuit as claimed in claim 1 or 2, it is characterized in that, described electric source filter circuit is π type filtering circuit, comprise electric capacity C82, inductance L 2 and electric capacity C38, described electric capacity C82 is connected with backlight electric power respectively with one end of inductance L 2, described electric capacity C82 other end ground connection, the other end of described inductance L 2 is connected with one end of described electric capacity C38, described electric capacity C38 other end ground connection, the junction of described inductance L 2 and described electric capacity C38 is as the output terminal of described electric source filter circuit.
5. LCD backlight ON-OFF control circuit as claimed in claim 4, it is characterized in that, also comprise electric capacity C210, described electric capacity C210 is electrochemical capacitor, and the positive pole of described electric capacity C210 is connected with the output terminal of described electric source filter circuit, minus earth.
6. LCD backlight ON-OFF control circuit as claimed in claim 1, it is characterized in that, described backlight electric power is energy storage battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420591087.XU CN204257178U (en) | 2014-10-13 | 2014-10-13 | LCD backlight ON-OFF control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420591087.XU CN204257178U (en) | 2014-10-13 | 2014-10-13 | LCD backlight ON-OFF control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204257178U true CN204257178U (en) | 2015-04-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420591087.XU Expired - Fee Related CN204257178U (en) | 2014-10-13 | 2014-10-13 | LCD backlight ON-OFF control circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN204257178U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107966202A (en) * | 2017-12-14 | 2018-04-27 | 来学宝 | Electronic scale weighing module and its implementation |
| CN109039084A (en) * | 2018-07-25 | 2018-12-18 | 浙江中科领航汽车电子有限公司 | A kind of liquid crystal instrument for automobile bootstrapping power-supplying circuit |
-
2014
- 2014-10-13 CN CN201420591087.XU patent/CN204257178U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107966202A (en) * | 2017-12-14 | 2018-04-27 | 来学宝 | Electronic scale weighing module and its implementation |
| CN109039084A (en) * | 2018-07-25 | 2018-12-18 | 浙江中科领航汽车电子有限公司 | A kind of liquid crystal instrument for automobile bootstrapping power-supplying circuit |
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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: 20150408 Termination date: 20191013 |