CN201374176Y - Liquid crystal backlight energy-saving circuit and liquid crystal display device - Google Patents
Liquid crystal backlight energy-saving circuit and liquid crystal display device Download PDFInfo
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- CN201374176Y CN201374176Y CN200920130237U CN200920130237U CN201374176Y CN 201374176 Y CN201374176 Y CN 201374176Y CN 200920130237 U CN200920130237 U CN 200920130237U CN 200920130237 U CN200920130237 U CN 200920130237U CN 201374176 Y CN201374176 Y CN 201374176Y
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Abstract
The utility model is suitable for the field of liquid crystal backlight and provides a liquid crystal backlight energy-saving circuit. The circuit comprises an infrared detection unit, a filtering unit, an amplifying unit, a comparing unit and a microprocessor, wherein the infrared detection unit is used for detecting whether human infrared signals exist or not within a preset range in the front of a liquid crystal television, the filtering unit is connected with the infrared detection unit and used for completing filtering processing to detected signals, the input end of the amplifying unit is connected with the output end of the filtering unit, the input end of the comparing unit is connected with the output end of the amplifying unit, the comparing unit compares the detected signals with system reference valves and outputs the comparison result through a signal output unit, the microprocessor is connected with the signal output unit and controls the output of a brightness output unit according to the comparison result of the comparing unit. When the microprocessor receives the signal that nobody watches the liquid crystal television, the backlight brightness of the liquid crystal television can be reduced 50%, thereby effectively reducing power consumption of the liquid crystal television, and achieving the purpose of saving energy.
Description
Technical field
The utility model belongs to the LCD backlight field, relates in particular to a kind of LCD backlight energy-saving circuit and liquid crystal indicator.
Background technology
Continuous development along with lcd technology, the characteristics that LCD TV is light, thin more and more are subjected to people's welcome, but the LCD TV power consumption is bigger, and particularly the backlight illumination of liquid crystal panel control power consumption accounts for more than 90 percent, if TV is in open state of whole LCD TV power consumption, and the people does not watch, at this moment the backlight illumination of liquid crystal panel control power consumption can't effectively reduce, but continues to consume identical electric energy, wastes energy, so prior art haves much room for improvement.
The utility model content
The purpose of this utility model is to provide a kind of LCD backlight energy-saving circuit, and be intended to solve LCD TV and be in open state, when nobody watches, the problem that the backlight illumination of liquid crystal panel control power consumption can't effectively reduce.
The utility model is achieved in that a kind of LCD backlight energy-saving circuit, and this circuit comprises:
Survey the infrared detecting unit that has or not human infrared signal in the preceding preset range of LCD TV;
The filter unit that is connected with described infrared detecting unit carries out Filtering Processing to detectable signal;
Amplifying unit, input end is connected with the output terminal of described filter unit;
Comparing unit, input end is connected with the output terminal of described amplifying unit, detectable signal and system reference value is compared, and comparative result is exported by a signal output unit;
Microprocessor is connected with the output terminal of described signal output unit, controls the output of described brightness output unit according to the comparative result of described comparing unit.
Further, also comprise delay unit, be connected with the input end of microprocessor.
Another purpose of the present utility model is to provide a kind of liquid crystal indicator of LCD backlight energy-saving circuit as mentioned above that has.
In the utility model, the detectable signal by infrared detecting unit receives carries out filtering through filter unit to detectable signal successively; Amplifying unit amplifies detectable signal; Comparing unit compares detectable signal value and system reference value, then detectable signal entering signal output unit; The detectable signal of signal output unit is delivered to microprocessor with detectable signal after delaying time by delay unit, microprocessor is according to the output of the comparative result control brightness output unit of comparing unit, when microprocessor receives nobody when watching the detectable signal of LCD TV, the backlight illumination of LCD TV reduces by 50%, when microprocessor receives the someone when watching the detectable signal of LCD TV, constant or the reduction of the backlight illumination of LCD TV, can effectively reduce the power consumption of LCD TV like this, reach purpose of energy saving.
Description of drawings
Fig. 1 is a kind of LCD backlight energy-saving circuit module map that the utility model provides;
Fig. 2 is a kind of LCD backlight energy-saving circuit figure that the utility model provides.
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.
In the utility model embodiment, the detectable signal by infrared detecting unit receives carries out filtering through filter unit to detectable signal successively; Amplifying unit amplifies detectable signal; Comparing unit compares detectable signal value and system reference value, then detectable signal entering signal output unit; Signal output unit is delivered to microprocessor with detectable signal after delaying time by delay unit, and microprocessor is according to the output of the comparative result control brightness output unit of comparing unit.
Fig. 1 is a kind of LCD backlight energy-saving circuit module map that the utility model provides, and details are as follows:
A kind of LCD backlight energy-saving circuit, this circuit comprises:
Survey the infrared detecting unit 101 that has or not human infrared signal in the preceding preset range of LCD TV;
Filter unit 102 with described infrared detecting unit 101 is connected carries out Filtering Processing to detectable signal;
Amplifying unit 103, input end is connected with the output terminal of described filter unit 102;
Comparing unit 104, input end is connected with the output terminal of described amplifying unit 103, detectable signal and system reference value is compared, and comparative result is exported by a signal output unit 105;
Microprocessor 107 is connected with the output terminal of described signal output unit 105, controls the output of described brightness output unit 108 according to the comparative result of described comparing unit 104.
Infrared detecting unit 101 detects interior (preceding 5 meters as televisor of the preceding default effective range of televisor, in the scope of visual angle 60 degree) whether human infrared signal arranged, the human infrared signal that infrared detecting unit 101 detects exports comparing unit 104 through filter unit 102 filtering, amplifying unit 103 to after amplifying successively, 104 pairs of detectable signals of comparing unit and system reference value compare, then detectable signal entering signal output unit 105; The detectable signal of signal output unit 105 is delivered to microprocessor 107 with detectable signal after delaying time by delay unit 106, microprocessor 107 is according to the output of the comparative result control brightness output unit 108 of comparing unit 104, the effect of delay unit 106 is: when starting shooting or the people is arranged near LCD TV, the detectable signal of infrared detecting unit reception 101 this moment can cause microprocessor 107 erroneous judgements disconnected, disconnected in order to prevent microprocessor 107 erroneous judgements, can set certain delay time, delay time can be decided according to actual conditions, generally be set in 20 seconds, when time during more than or equal to 20 seconds, microprocessor 107 detects nobody when watching the signal of TV, and liquid crystal backlight lighteness reduces by 50%.
Fig. 2 is a kind of LCD backlight energy-saving circuit figure that the utility model provides, and details are as follows:
Infrared detecting unit 101 adopts detector LN074B to pop one's head in, detector has at least three signal output parts, be respectively the first signal output part D, secondary signal output terminal S, the 3rd signal output part E, probe sends the three beams signal at least, determines investigative range by the signal that detector sends, probe mainly is the material by a kind of high Seebeck coefficient, makes the detector of size as lead zirconate titanate system pottery, tantalic acid triglycine sulfate etc.For the detection sensitivity that improves detector to increase detection range, generally at Fresnel Lenses of the place ahead of detector installing, these lens are made with transparent plastic, the upper and lower faces part of lens respectively is divided into some equal portions, make a kind of lens with special optical system, it matches with amplifying circuit, signal can be amplified, and so just can measure the action of people in the scope far away.
Filter unit 102 is a bandpass filter, comprises first capacitor C
1, second capacitor C
2, first resistance R
1, second resistance R
2Amplifying unit 103 comprises the 3rd capacitor C
3, the first triode Q
1, the first amplifier IC1, the 4th resistance R
4, the 4th capacitor C
4, the 5th resistance R
5, the 6th capacitor C
6Comparing unit 104 comprises the second amplifier IC2 and regulates resistance R
pSignal output unit 105 comprises the 6th resistance R
6, the second triode Q
2, the 7th resistance R
7, diode D2, switch J1, wherein switch J1 can be relay; Delay unit 106 comprises the 3rd triode Q
3, the 7th capacitor C
7, the 8th resistance R
8, the 9th resistance R
9, the tenth resistance R
10, wherein, first capacitor C
1The first end ground connection, second end respectively with the detector first output terminal D and second resistance R
2First end link to each other second resistance R
2Second end by first resistance R
1Respectively with second capacitor C
2First end and the first triode Q
1Base stage connect second capacitor C
2Second end be connected the first triode Q with the detector second output terminal S
1Be the NPN type, first resistance R
1Two ends be connected to the first triode Q
1Base stage and collector, the first triode Q
1Emitter and detector the 3rd signal output part E ground connection, second capacitor C
2First end by the 3rd capacitor C
3Be connected in the inverting input of the first amplifier IC1, the 4th resistance R
4With the 4th capacitor C
4Series connection, an end is connected other end ground connection, the 5th resistance R with the first amplifier IC1 in-phase input end
5With the 6th capacitor C
6Parallel connection, two ends are connected to in-phase input end and the output terminal of the first amplifier IC1, and the output terminal of the first amplifier IC1 also is connected in the inverting input of the second amplifier IC2, swept resistance R
pSliding end be connected in the in-phase input end of the second amplifier IC2, two ends are connected to detector first signal output part D and the earth terminal in addition, the output terminal of the second amplifier IC2 is by the 6th resistance R
6Be connected in the second triode Q
2Base stage, the second triode Q
2Be the NPN type, diode D2 is in parallel with switch J1, and the anodal end of back diode D2 in parallel is by the 7th resistance R
7Be connected in the second triode Q
2Collector, diode D2 negative pole one end is connected in the detector first signal output part D, the second triode Q
2Grounded emitter, collector also is connected with the brightness output unit, the second triode Q
2Base stage also with the 3rd triode Q
3Collector connect the 3rd triode Q
3Be positive-negative-positive, the 9th resistance R
9With the tenth resistance R
10Back in parallel one end is connected in emitter and the ground connection of the 3rd triode Q3, and the other end is connected in the 3rd triode Q
3Base stage, the 7th capacitor C
7One end is by the 8th resistance R
8Be connected in the 3rd triode Q
3Base stage, the other end links to each other the 5th capacitor C with the detector first signal output part D
5One end ground connection, the other end is connected with the detector first signal output part D, and the detector first signal output part D also is connected in power end, and supply voltage can be 9V.
The principle of work of a kind of LCD backlight energy-saving circuit that the utility model provides is:
When detector receives after heat that human body discharges releases infrared signal, become a faint low frequency signal of the about 0.3～3Hz of frequency by the detector internal conversion, earlier by by first capacitor C
1, second capacitor C
2, first resistance R
1, second resistance R
2The bandpass filter of forming, because the detectable signal voltage very faint (only having about 1mV usually) of pyroelectric infrared sensor output, and be the signal of a variation, the effect of Fresnel Lenses simultaneously makes output signal voltage be impulse form again, and (frequency of pulse voltage is by the translational speed decision of testee, be generally about 0.1～10Hz), so releasing the filtered voltage signal that passes through of infrared sensor output, reply heat amplifies.Through the first triode Q
1, the first amplifier IC1 two-stage amplify to amplify the back input second amplifier IC2.Direct current amplifier, about 70～75 decibels of full gain are adopted in the two-stage voltage amplification.
Swept resistance R in the comparing unit 104
pBe the reference voltage regulator potentiometer, be used for regulating circuit sensitivity, just investigative range.When infrared probe unit 101 does not receive the detectable signal of human infrared signal, reference voltage (the 5 pin voltages of the second amplifier IC2) is higher than the output voltage (the 4 pin voltages of the second amplifier IC2) of the first amplifier IC1, the second amplifier IC2 output low level.When infrared probe unit 101 received the detectable signal of human infrared signal, detector output detecting voltage was through the 3rd triode Q
1Make signal output voltage be higher than reference voltage after amplifying with the first amplifier IC1, the high level of 6 pin of second amplifier IC2 output at this moment, the 3rd triode Q
2Conducting, switch is connected in the electric adhesive of switch J1 energy.
Acting as of delay unit 106: when starting shooting or the people is arranged near LCD TV, the induced signal that infrared detecting unit receives can make second amplifier IC2 output high level, causes false triggering.With the start is example, and the start delay circuit is being started shooting moment, because the 7th capacitor C
7The charging effect and make the 3rd triode Q
3Conducting, the high level that so just makes amplifier IC3 output is through the 3rd triode Q
3The earthing, the second triode Q
2Can the remain off state, prevented the start false triggering.The start delay time is by the 7th capacitor C
7With the 8th resistance R
8Time constant decision, about 20 seconds, the 5th capacitor C 5 mainly strobed.
The effect of diode D2 mainly is in order to protect the second triode Q
2Deng the driving components and parts.The second triode Q in figure
2By conducting become by the time, the electric current of the relay coil of flowing through will reduce rapidly, at this moment coil is added in the second triode Q after can producing the stack of very high self-induction electromotive force and supply voltage
2Collector, emitter two interpolars, can make the second triode Q
2Puncture, in parallel connection behind the diode D2, can be with the self-induction electromotive force clamper of coil in the forward conduction voltage of diode D2, this is worth the about 0.7V of silicone tube, the about 0.2V of germanium tube, thus avoid puncturing the second triode Q
2Deng the driving components and parts.Should note the positive-negative polarity of diode D2 during parallel diode D2, can not connect instead, drive components and parts otherwise damage transistor etc. easily.
In the utility model embodiment, the detectable signal that infrared detecting unit 101 receives, filter unit 102 successively through detectable signal is carried out filtering; The amplifying unit 103 that detectable signal is amplified; The comparing unit 104 that detectable signal and system reference value are compared, detectable signal entering signal output unit 105 then; Signal output unit 105 is delivered to microprocessor 107 with detectable signal after delaying time by delay unit 106, microprocessor 107 is according to the output of the comparative result control brightness output unit 108 of comparing unit 104, when microprocessor 107 receives nobody when watching the detectable signal of LCD TV, the backlight illumination of LCD TV reduces by 50%, when microprocessor 107 receives the someone when watching the detectable signal of LCD TV, constant or the reduction of the backlight illumination of LCD TV, can effectively reduce the power consumption of LCD TV like this, reach purpose of energy saving.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1, a kind of LCD backlight energy-saving circuit is characterized in that, comprising:
Survey the infrared detecting unit that has or not human infrared signal in the preceding preset range of LCD TV;
The filter unit that is connected with described infrared detecting unit carries out Filtering Processing to detectable signal;
Amplifying unit, input end is connected with the output terminal of described filter unit;
Comparing unit, input end is connected with the output terminal of described amplifying unit, detectable signal and system reference value is compared, and comparative result is exported by a signal output unit;
Microprocessor is connected with the output terminal of described signal output unit, controls the output of described brightness output unit according to the comparative result of described comparing unit.
2, a kind of LCD backlight energy-saving circuit as claimed in claim 1 is characterized in that described circuit also comprises delay unit, and described delay unit is connected with the input end of described microprocessor.
3 a kind of LCD backlight energy-saving circuits as claimed in claim 1 is characterized in that described infrared detecting unit is a detector, and detector has at least three signal output parts, and first signal output part of detector is connected with power end.
4, a kind of LCD backlight energy-saving circuit as claimed in claim 3, it is characterized in that, described filter unit comprises: first resistance, second resistance, first electric capacity, second electric capacity, the first end ground connection of described first electric capacity, second end is connected with described second resistance, first end with described detector first signal output part respectively, second end of described second resistance is connected with described second electric capacity, first end by described first resistance, and described second electric capacity, second end is connected with the secondary signal output terminal of described detector.
5, a kind of LCD backlight energy-saving circuit as claimed in claim 4, it is characterized in that, described amplifying unit comprises: the 3rd electric capacity, first triode, first amplifier, the 4th resistance, the 4th electric capacity, the 5th resistance, the 6th electric capacity, described first amplifier's inverting input is connected with described second electric capacity, first end by described the 3rd electric capacity; Described the 4th resistance and described the 4th capacitances in series, an end is connected other end ground connection with the described first amplifier in-phase input end; Described the 5th resistance and described the 6th electric capacity parallel connection, two ends are connected between the in-phase input end and output terminal of first amplifier, described first transistor base is connected with described second electric capacity, first end, collector is connected with described second resistance, second end, and emitter is connected with described detector the 3rd signal output part and ground connection.
6, a kind of LCD backlight energy-saving circuit as claimed in claim 5, it is characterized in that, described comparing unit comprises: second amplifier, swept resistance, described second amplifier's inverting input is connected with the output terminal of described first amplifier, the in-phase input end of described second amplifier is connected with the sliding end of described swept resistance, and an end of described swept resistance is connected other end ground connection with described detector first signal output part.
7, a kind of LCD backlight energy-saving circuit as claimed in claim 6 is characterized in that described signal output unit comprises: the 6th resistance, second triode, the 7th resistance, diode, switch, described second transistor base is connected with described second amplifier out by the 6th resistance; Described diode and described switch in parallel, described diode anode is connected with second transistor collector by the 7th resistance, described diode cathode is connected with described detector first signal output part, the described second transistor emitter ground connection, and collector also is connected with the brightness output unit.
8, a kind of LCD backlight energy-saving circuit as claimed in claim 7, it is characterized in that, described delay unit comprises the 3rd triode, the 7th electric capacity, the 8th resistance, the 9th resistance, the tenth resistance, described the 3rd transistor collector is connected with described second transistor base, an end is connected with described second transistor emitter and ground connection after described the 9th resistance and described the tenth resistance parallel connection, the other end is connected with described the 3rd transistor base, and described the 7th electric capacity one end is connected in described the 3rd transistor base by the 8th resistance, and the other end is connected with described detector first signal output part.
9, a kind of LCD backlight energy-saving circuit as claimed in claim 7, its spy is being that switch is a relay.
10, a kind of liquid crystal indicator is characterized in that, described liquid crystal indicator comprises as each described LCD backlight energy-saving circuit of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920130237U CN201374176Y (en) | 2009-03-31 | 2009-03-31 | Liquid crystal backlight energy-saving circuit and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920130237U CN201374176Y (en) | 2009-03-31 | 2009-03-31 | Liquid crystal backlight energy-saving circuit and liquid crystal display device |
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| Publication Number | Publication Date |
|---|---|
| CN201374176Y true CN201374176Y (en) | 2009-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920130237U Expired - Fee Related CN201374176Y (en) | 2009-03-31 | 2009-03-31 | Liquid crystal backlight energy-saving circuit and liquid crystal display device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101930704A (en) * | 2010-08-05 | 2010-12-29 | 宋四海 | Information release terminal device with human body-sensing display |
| CN103077695A (en) * | 2012-12-20 | 2013-05-01 | 广州视睿电子科技有限公司 | Automatic brightness adjusting method and device for television and computer integrated machine |
| CN106018899A (en) * | 2016-07-08 | 2016-10-12 | 华立科技股份有限公司 | Infrared wake-up intelligent electric meter processing method |
| CN116884362A (en) * | 2023-09-07 | 2023-10-13 | 众显科技(深圳)有限公司 | Liquid crystal display screen driving circuit |
-
2009
- 2009-03-31 CN CN200920130237U patent/CN201374176Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101930704A (en) * | 2010-08-05 | 2010-12-29 | 宋四海 | Information release terminal device with human body-sensing display |
| CN101930704B (en) * | 2010-08-05 | 2012-07-04 | 宋四海 | Information release terminal device with human body-sensing display |
| CN103077695A (en) * | 2012-12-20 | 2013-05-01 | 广州视睿电子科技有限公司 | Automatic brightness adjusting method and device for television and computer integrated machine |
| CN106018899A (en) * | 2016-07-08 | 2016-10-12 | 华立科技股份有限公司 | Infrared wake-up intelligent electric meter processing method |
| CN116884362A (en) * | 2023-09-07 | 2023-10-13 | 众显科技(深圳)有限公司 | Liquid crystal display screen driving circuit |
| CN116884362B (en) * | 2023-09-07 | 2023-11-17 | 众显科技(深圳)有限公司 | Liquid crystal display screen driving circuit |
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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: 20091230 Termination date: 20150331 |
|
| EXPY | Termination of patent right or utility model |