CN102883505A - LED (light-emitting diode) driving circuit, method and LED lamp bar - Google Patents
LED (light-emitting diode) driving circuit, method and LED lamp bar Download PDFInfo
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- CN102883505A CN102883505A CN2012103549859A CN201210354985A CN102883505A CN 102883505 A CN102883505 A CN 102883505A CN 2012103549859 A CN2012103549859 A CN 2012103549859A CN 201210354985 A CN201210354985 A CN 201210354985A CN 102883505 A CN102883505 A CN 102883505A
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- 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 invention discloses a LED (light-emitting diode) driving circuit which comprises a light emitting module and an AC (alternate current) first input end and an AC second input end which are respectively arranged at both ends of the light emitting module, wherein the light emitting module comprises a first LED group and a second LED group which are connected in parallel; and both the first LED group and the second LED group comprise a plurality of LEDs which are correspondingly connected in series and have ethe same conduction directions. According to the invention, AC square signals with equal sizes and opposite phases are input into the light emitting module by the AC first input end and the AC second input end, so that the LEDs of a LED lamp bar are alternately lightened, the LED backlight is uniform, the LED brightness is strengthened, the display effect is better, the driving voltage is also reduced, the electric energy is saved and the use safety is ensured. Moreover, the LED driving circuit has the advantages of simple and reasonable circuit structure and easiness for implementing. The invention also further discloses a LED driving method and the LED lamp bar.
Description
Technical field
The present invention relates to LED Driving technique field, relate in particular to a kind of led drive circuit, method and LED lamp bar.
Background technology
Along with development and the renewal of backlight technology, CRT(Cathode Ray Tube, cathode ray tube) color TV is rapidly by LCD(Liquid Crystal Display, liquid crystal display) TV replaces.Because the LCDs of LCD TV itself can be not luminous, therefore need back lighting.Backlight technology has experienced the Lamp from CCFL(Cold Cathode Fluorescent, cathode fluorescent tube) backlight to LED(Light Emitting Diode, light-emitting diode) process backlight, LED-backlit becomes the main flow of present backlight technology with its low-power consumption, long working life and advantages of simple structure and simple.LED-backlit has straight-down negative and side entering type dual mode, the LED-backlit method of side entering type is located at the LED lamp around the LCDs, by light guide plate with photoconduction on LCDs, reach the illumination purpose, because the LED-backlit mode of side entering type can realize extra-thin LCD TV, therefore be widely used.
In the prior art, lamp bar (LIGHT BAR) generally is in series by some LED lamps, the drive circuit figure of side entering-type LED backlight mode as shown in Figure 1, method shown in Figure 1 is simple in structure, be easy to realize that still, it adopts dc powered, when the quantity of LED lamp is many, it is very high that LED-backlit drives required voltage, and then the insulating requirements of lamp bar is also increased accordingly, and safety problem can not get good guarantee.
Summary of the invention
Main purpose of the present invention is to propose a kind of led drive circuit, method and LED lamp bar, is intended to reduce the driving voltage of lamp bar, guarantees to use safety.
In order to achieve the above object, the present invention proposes a kind of led drive circuit, and this circuit comprises light emitting module and the alternating current first input end and alternating current the second input that are separately positioned on these light emitting module two ends, wherein:
Described light emitting module comprises LED group and the 2nd LED group that two-way is arranged in parallel, and described LED group and the 2nd LED organize and include some series connection, LED that conducting direction is identical;
Described LED group is opposite with the conducting direction of the 2nd LED group.
Preferably, described alternating current first input end and alternating current the second input are to the ac square wave signal of described light emitting module input equal and opposite in direction, single spin-echo.
The present invention further also proposes a kind of LED driving method, and the method comprises:
Will be in parallel by LED group and the 2nd LED group that the identical LED of some conducting directions is in series, form light emitting module, described LED group is opposite with the conducting direction of the 2nd LED group;
Alternating current first input end by being arranged on described light emitting module two ends and alternating current the second input drive described light emitting module to described light emitting module input AC square-wave signal.
Preferably, described alternating current first input end and alternating current the second input are to the ac square wave signal of described light emitting module input equal and opposite in direction, single spin-echo.
Preferably, the described light emitting module of described driving is specially:
According to described ac square wave signal, the described LED group of driven and the 2nd LED group are alternately lighted described LED group and the 2nd LED group.
The present invention further also proposes a kind of LED lamp bar, this LED lamp bar comprises a pcb board, comprise above-mentioned led drive circuit on this pcb board, this led drive circuit comprises light emitting module and the alternating current first input end and alternating current the second input that are separately positioned on these light emitting module two ends, wherein:
Described light emitting module comprises LED group and the 2nd LED group that two-way is arranged in parallel, and described LED group includes some series connection and the identical LED of conducting direction with the 2nd LED group;
Described LED group is opposite with the conducting direction of the 2nd LED group;
Wherein, the LED in the described led drive circuit is word order along described pcb board, and the conducting direction of adjacent two described LED is opposite.
The present invention inputs the ac square wave signal of equal and opposite in direction, single spin-echo by alternating current first input end and alternating current the second input to light emitting module, and at the positive half period of ac square wave signal, the LED of LED group is driven, light; And at the negative half-cycle of ac square wave signal, the LED of the 2nd LED group is driven, light.The present invention adopts and exchanges the type of drive driving LED, because alternating current provides square-wave signal, voltage amplitude is constant, therefore in a voltage-phase, the luminous brightness preservation of LED in the one LED group is constant, and the luminous brightness of LED in the 2nd LED group also remains unchanged; Because the equal and opposite in direction of ac square wave signal, so that the luminous brightness of the luminous brightness of the LED in the LED group and the LED in the 2nd LED group is identical, LED-backlit is even, stable luminescence; The single spin-echo of ac square wave signal so that the LED in the LED in the LED group and the 2nd LED group by driven, light, and guarantee in the LED group 201 at any one time LED or and the 2nd LED group 202 in LED light, display effect is better.The voltage cycle of an ac square wave signal can drive the two paths of LED group, in the certain situation of voltage, can drive and double original lamp number, strengthens LED brightness, and display effect is better; Quantity one timing as LED can reduce doubling original driving voltage, thereby reduce driving voltage, saves electric energy, reduces the insulating requirements to the lamp bar, guarantees to use safety.And, the advantage that have the circuit structure advantages of simple, is easy to realize.
Description of drawings
Fig. 1 is the circuit structure diagram of led drive circuit in the prior art;
Fig. 2 is the circuit structure diagram of led drive circuit one embodiment of the present invention;
Fig. 3 is the circuit structure diagram of another embodiment of led drive circuit of the present invention;
Fig. 4 is the circuit structure diagram of the another embodiment of led drive circuit of the present invention;
Fig. 5 is the schematic flow sheet of LED driving method one embodiment of the present invention;
Fig. 6 is the structural representation of LED lamp bar one embodiment of the present invention.
The realization of the object of the invention, functional characteristics and advantage are described further with reference to accompanying drawing in connection with embodiment.
Embodiment
Further specify technical scheme of the present invention below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
The present invention proposes a kind of led drive circuit.
With reference to Fig. 2, Fig. 2 is the circuit structure diagram of led drive circuit one embodiment of the present invention.
In the present embodiment, this led drive circuit comprises light emitting module 20 and the alternating current first input end 10 and alternating current the second input 30 that are separately positioned on these light emitting module 20 two ends.Light emitting module 20 comprises LED group the 201 and the 2nd LED group 202 that two-way is arranged in parallel, wherein, the one LED group 201 comprises some series connection, the LED that conducting direction is identical, the 2nd LED group 202 comprises some series connection, the LED that conducting direction is identical, and LED group is opposite with the conducting direction of the 2nd LED group.
As shown in Figure 2, alternating current first input end 10 and alternating current the second input 30 are connected to the two ends of light emitting module 20, the one LED group 201 comprises the LED D1 to D6 of six series connection that conducting direction is identical, and the 2nd LED group 202 comprises the LED D7 to D12 of six series connection that conducting direction is identical; The LED group 201 that is in series by D1 to D6 is opposite with the conducting direction of the 2nd LED group 202 that is in series by D7 to D12.
Particularly, when connecting alternating current, if at the beginning at the positive alternating current of alternating current first input end 10 inputs, at the negative alternating current of alternating current the second input 30 inputs, then at positive half period, the LED conducting of the one LED group 201, and the LED cut-off of the 2nd LED group 202, this moment the one LED group 201 LED D1 to D6 driven, light; And at negative half-cycle, alternating current first input end 10 changes the negative alternating current of input into, changes the positive alternating current of input at alternating current the second input 30, the LED conducting of the 2nd LED group 202, and the LED of LED group 201 cut-off, this moment the 2nd LED group 202 LED D7 to D12 driven, light.
The present embodiment led drive circuit provides positive voltage when connecting alternating current when positive half period, negative voltage is provided when negative half-cycle so that the LED of the LED of LED group 201 and the 2nd LED group 202 by driven, light.The voltage cycle of an ac square wave signal can drive the two paths of LED group, in the certain situation of voltage, can drive and double original lamp number, strengthens LED brightness, and display effect is better; Quantity one timing as LED can reduce doubling original driving voltage, thereby reduce driving voltage, saves electric energy, reduces the insulating requirements to the lamp bar, guarantees to use safety.
In the above-described embodiments, alternating current first input end 10 and the ac square wave signal of alternating current the second input 30 to light emitting module 20 input equal and opposite in directions, single spin-echo.When connecting alternating current, if at the beginning at the positive alternating current of alternating current first input end 10 inputs, at the negative alternating current of alternating current the second input 30 inputs, then at the positive half period of ac square wave signal, such as first phase place at the ac square wave signal, the LED of ac square wave signal driver the one LED group 201, i.e. the LED conducting of LED group 201, and the LED of the 2nd LED group 202 cut-off, this moment the one LED group 201 LED D1 to D6 driven, light; And at the negative half-cycle of ac square wave signal, such as second phase place at the ac square wave signal, alternating current first input end 10 changes the negative alternating current of input into, change the positive alternating current of input at alternating current the second input 30, the LED of ac square wave signal driver the 2nd LED group 202, the i.e. LED conducting of the 2nd LED group 202, and the LED cut-off of LED group 201, this moment the 2nd LED group 202 LED D7 to D12 driven, light.
The one LED group the 201 and the 2nd LED group 202 receives the ac square wave signal of equal and opposite in direction, single spin-echo, because alternating current provides square-wave signal, voltage amplitude is constant, therefore in a voltage-phase, the luminous brightness preservation of LED in the one LED group 201 is constant, and the luminous brightness of LED in the 2nd LED group 202 also remains unchanged; Because the equal and opposite in direction of ac square wave signal, so that the luminous brightness of the luminous brightness of the LED in the LED group 201 and the LED in the 2nd LED group 202 is identical, LED-backlit is even, stable luminescence; The single spin-echo of ac square wave signal, so that the LED in the LED in the LED group 201 and the 2nd LED group 202 by driven, light, and guarantee in the LED group 201 at any one time LED or and the 2nd LED group 202 in LED light, display effect is better.
With reference to Fig. 3, Fig. 3 is the circuit structure diagram of another embodiment of led drive circuit of the present invention.
In the present embodiment, this led drive circuit proposes for adapting to another kind of pcb board.As shown in Figure 3, this led drive circuit comprises light emitting module 20 and the alternating current first input end 10 and alternating current the second input 30 that are separately positioned on its two ends; Alternating current first input end 10 and alternating current the second input 30 drive light emitting module 20 to the ac square wave signal of light emitting module 20 input equal and opposite in directions, single spin-echo.LED in the light emitting module 20 represents with D1-D12 that respectively wherein, D1 is in parallel with D7, and D1, D7 connect with D8, D2 respectively; D8 is in parallel with D2, and D8, D2 connect with D3, D9 respectively; D3 is in parallel with D9, and D3, D9 connect with D10, D4 respectively; D10 is in parallel with D4, and D10, D4 connect with D5, D11 respectively; D5 is in parallel with D11, and D5, D11 connect with D12, D6 respectively; D12 is in parallel with D6; The conducting direction of D1, D2, D3, D4, D5 and D6 is identical, and opposite with the conducting direction of D7, D8, D9, D10, D11 and D12.
In above-described embodiment, alternating current first input end 10 and alternating current the second input 30 are to the ac square wave signal of light emitting module 20 input equal and opposite in directions, single spin-echo.When connecting alternating current, if at the beginning at the positive alternating current of alternating current first input end 10 inputs, at the negative alternating current of alternating current the second input 30 inputs, then at the positive half period of ac square wave signal, such as first phase place at the ac square wave signal, D1, D2, D3, D4, D5 and D6 conducting, electric current flow through D1, D2, D3, D4, D5 and D6, this moment D1, D2, D3, D4, D5 and D6 driven, light; And at the negative half-cycle of ac square wave signal, such as second phase place at the ac square wave signal, alternating current first input end 10 changes the negative alternating current of input into, change the positive alternating current of input at alternating current the second input 30, D7, D8, D9, D10, D11 and D12 conducting, electric current flow through D7, D8, D9, D10, D11 and D12, this moment D7, D8, D9, D10, D11 and D12 driven, light.
In above-described embodiment, the circuit structure of this led drive circuit is applicable to a kind of inner pcb board that has certain specific connected relation originally, can be according to the connected relation of the inside of pcb board, the LED in this led drive circuit in PCB figure, selects accordingly corresponding placement-and-routing's mode that the LED in this led drive circuit is encapsulated and carries out placement-and-routing, so that can play on pcb board according to certain rules by different way.
This led drive circuit is put LED in many ways flexibly on the pcb board of being made by this led drive circuit except having the beneficial effect identical with led drive circuit in the previous embodiment.
With reference to Fig. 4, Fig. 4 is the circuit structure diagram of the another embodiment of led drive circuit of the present invention.
In the present embodiment, this led drive circuit proposes at pcb board through hole being set.As shown in Figure 4, this led drive circuit comprises light emitting module 20 and the alternating current first input end 10 and alternating current the second input 30 that are separately positioned on its two ends; Alternating current first input end 10 and alternating current the second input 30 drive light emitting module 20 to the ac square wave signal of light emitting module 20 input equal and opposite in directions, single spin-echo.LED in the light emitting module 20 represents with D1-D12 that respectively wherein, D1 is in parallel with D7, and D1, D7 connect with D8, D2 respectively; D8 is in parallel with D2, and D8 connects with D3, D9 respectively; D3 is in parallel with D9, and D3, D9 connect with D10, D4 respectively; D10 is in parallel with D4, and D10 connects with D5, D11 respectively; D5 is in parallel with D11, and D5, D11 connect with D12, D6 respectively; D12 is in parallel with D6; The conducting direction of D1, D2, D3, D4, D5 and D6 is identical, and opposite with the conducting direction of D7, D8, D9, D10, D11 and D12.
In above-described embodiment, alternating current first input end 10 and alternating current the second input 30 are to the ac square wave signal of light emitting module 20 input equal and opposite in directions, single spin-echo.When connecting alternating current, if at the beginning at the positive alternating current of alternating current first input end 10 inputs, at the negative alternating current of alternating current the second input 30 inputs, then at the positive half period of ac square wave signal, such as first phase place at the ac square wave signal, D1, D2, D3, D4, D5 and D6 conducting, electric current flow through D1, D2, D3, D4, D5 and D6, this moment D1, D2, D3, D4, D5 and D6 driven, light; And at the negative half-cycle of ac square wave signal, such as second phase place at the ac square wave signal, alternating current first input end 10 changes the negative alternating current of input into, change the positive alternating current of input at alternating current the second input 30, D7, D8, D9, D10, D11 and D12 conducting, electric current flow through D7, D8, D9, D10, D11 and D12, this moment D7, D8, D9, D10, D11 and D12 driven, light.
In above-described embodiment, the circuit structure of this led drive circuit is at pcb board through hole to be set, and the through hole of various shapes is set at pcb board according to the installation needs, such as circular, square etc., in the present embodiment, two through holes on pcb board, and with LED among evenly put.
This led drive circuit can also arrange through hole at the pcb board of being made by this led drive circuit except having the beneficial effect identical with led drive circuit among the first two embodiment, be convenient to the installation of pcb board with fixing.
The present invention proposes a kind of LED driving method.
With reference to Fig. 2 and Fig. 5, Fig. 5 is the schematic flow sheet of LED driving method one embodiment of the present invention in the lump.
In the present embodiment, this LED driving method comprises the steps:
Step S10: will organize 202 parallel connections by LED group the 201 and the 2nd LED that the identical LED of some conducting directions is in series, and form light emitting module 20, and LED group be opposite with the conducting direction of the 2nd LED group.
As shown in Figure 2, alternating current first input end 10 and alternating current the second input 30 are connected to the two ends of light emitting module 20, the one LED group 201 comprises the LED D1 to D6 of six series connection that conducting direction is identical, and the 2nd LED group 202 comprises the LED D7 to D12 of six series connection that conducting direction is identical; The LED group 201 that is in series by D1 to D6 is opposite with the conducting direction of the 2nd LED group 202 that is in series by D7 to D12.
Particularly, when connecting alternating current, if at the beginning at the positive alternating current of alternating current first input end 10 inputs, at the negative alternating current of alternating current the second input 30 inputs, then at positive half period, the LED conducting of the one LED group 201, and the LED cut-off of the 2nd LED group 202, this moment the one LED group 201 LED D1 to D6 driven, light; And at negative half-cycle, alternating current first input end 10 changes the negative alternating current of input into, changes the positive alternating current of input at alternating current the second input 30, the LED conducting of the 2nd LED group 202, and the LED of LED group 201 cut-off, this moment the 2nd LED group 202 LED D7 to D12 driven, light.
Alternating current provides positive voltage when positive half period, negative voltage is provided when negative half-cycle so that the LED of the LED of LED group 201 and the 2nd LED group 202 by driven, light.The voltage cycle of an ac square wave signal can drive the two paths of LED group, in the certain situation of voltage, can drive and double original lamp number, strengthens LED brightness, and display effect is better; Quantity one timing as LED can reduce doubling original driving voltage, thereby reduce driving voltage, saves electric energy, reduces the insulating requirements to the lamp bar, guarantees to use safety.
Step S20: the alternating current first input end 10 by being arranged on light emitting module 20 two ends and alternating current the second input 30 drive light emitting module 20 to light emitting module 20 input AC square-wave signals.
In above-described embodiment, when connecting alternating current, if at the beginning at the positive alternating current of alternating current first input end 10 inputs, at the negative alternating current of alternating current the second input 30 inputs, then at the positive half period of ac square wave signal, ac square wave signal driver the one LED organizes 201 LED, i.e. the LED conducting of LED group 201, and the LED of the 2nd LED group 202 cut-off, this moment the one LED group 201 LED D1 to D6 driven, light; And at the negative half-cycle of ac square wave signal, alternating current first input end 10 changes the negative alternating current of input into, change the positive alternating current of input at alternating current the second input 30, the LED of ac square wave signal driver the 2nd LED group 202, the i.e. LED conducting of the 2nd LED group 202, and the LED of LED group 201 cut-off, this moment the 2nd LED group 202 LED D7 to D12 driven, light.
Alternating current provides the ac square wave signal for light emitting module 20, voltage amplitude is constant, therefore in the positive half period of ac square wave signal, the luminous brightness preservation of LED in the one LED group 201 is constant, in the negative half-cycle of ac square wave signal, the luminous brightness of LED in the 2nd LED group 202 also remains unchanged.
In the above-described embodiments, alternating current first input end 10 and the ac square wave signal of alternating current the second input 30 to light emitting module 20 input equal and opposite in directions, single spin-echo.
In the embodiment of the invention, square-wave signal with constant current drives the lamp bar, require this square wave signal in the size of current of positive half period and equal in the size of current of negative half-cycle, therefore, alternating current first input end 10 and alternating current the second input 30 must be the signals of equal and opposite in direction, single spin-echo to the ac square wave signal of light emitting module 20 inputs.
LED group the 201 and the 2nd LED group 202 in the light emitting module 20 receives the ac square wave signal of equal and opposite in direction, single spin-echo, because alternating current provides square-wave signal, voltage amplitude is constant, therefore in a voltage-phase, the luminous brightness preservation of LED in the one LED group 201 is constant, and the luminous brightness of LED in the 2nd LED group 202 also remains unchanged; Because the equal and opposite in direction of ac square wave signal, so that the luminous brightness of the luminous brightness of the LED in the LED group 201 and the LED in the 2nd LED group 202 is identical, LED-backlit is even, stable luminescence; The single spin-echo of ac square wave signal, so that the LED in the LED in the LED group 201 and the 2nd LED group 202 by driven, light, and guarantee in the LED group 201 at any one time LED or and the 2nd LED group 202 in LED light, display effect is better.
Driving light emitting module 20 in the step S20 of above-described embodiment specifically comprises:
In above-described embodiment, when connecting alternating current, if at the beginning at the positive alternating current of alternating current first input end 10 inputs, at the negative alternating current of alternating current the second input 30 input, then at the positive half period of ac square wave signal, such as first phase place at the ac square wave signal, the LED of ac square wave signal driver the one LED group 201, the i.e. LED conducting of LED group 201, and the LED cut-off of the 2nd LED group 202, this moment the one LED group 201 LED D1 to D6 driven, light; And at the negative half-cycle of ac square wave signal, such as second phase place at the ac square wave signal, alternating current first input end 10 changes the negative alternating current of input into, change the positive alternating current of input at alternating current the second input 30, the LED of ac square wave signal driver the 2nd LED group 202, the i.e. LED conducting of the 2nd LED group 202, and the LED cut-off of LED group 201, this moment the 2nd LED group 202 LED D7 to D12 driven, light; Therefore, LED group the 201 and the 2nd LED group 202 is alternately lighted.
According to above-mentioned led drive circuit and driving method thereof, LED in LED in the one LED group 201 and the 2nd LED group 202 alternately lights, if namely by the LED conducting in positive half period the one LED group 201, LED conducting in negative half-cycle the 2nd LED group 202, that the LED of LED group 201 lights at positive half period so, LED in negative half-cycle the 2nd LED group 202 lights, thereby the LED of the LED of a LED group 201 and the 2nd LED group 202 alternately lights along with the variation of ac square wave signal phase, so repeatedly; Because cycle of ac square wave signal is very short, it is rapid that phase place changes, thereby the LED of the LED group 201 seen of naked eyes and the LED of the 2nd LED group 202 light always.
Ac square wave signal driven the one LED group the 201 and the 2nd LED group 202, so that at the positive half period of ac square wave signal, the LED of LED group 201 is driven, light; And at negative half-cycle, the LED D7 to D12 of the 2nd LED group 202 is driven, light, and LED-backlit is even, stable luminescence.
The present invention proposes a kind of LED lamp bar.
With reference to Fig. 6, Fig. 6 is the structural representation of LED lamp bar one embodiment of the present invention.
In the present embodiment, this LED lamp bar comprises a pcb board, comprises led drive circuit on this pcb board, and the circuit structure of this led drive circuit is identical with the circuit structure of above-mentioned described led drive circuit, repeats no more herein.Be noted that the LED in this led drive circuit is word order along pcb board, and the conducting direction of adjacent two LED is opposite, and the distance between adjacent two LED being equal, is LED D1 to D12 putting sequentially on pcb board as shown in Figure 6.
In above-described embodiment, the putting position of LED on pcb board is corresponding with the placement-and-routing that it is encapsulated among the PCB figure, therefore when pcb board is put LED, should aim at anode and the negative electrode of LED and put; For example, in the layout of PCB figure, the anode of the one LED D1 encapsulation of the one LED group 201 is in the left side, the negative electrode of the one LED D7 encapsulation of the 2nd LED group 202 is in the left side, and the D1 encapsulation layout of aliging with the D7 package level, the anode of the 2nd LED D2 encapsulation of the one LED group 201 is in the left side, by that analogy, LED encapsulation in the one LED group 201 and the LED in the 2nd LED group 202 are encapsulated among the PCB figure and replace and the horizontal alignment layout, layout according to LED connects up to it, therefore according to LED be encapsulated in placement-and-routing among the PCB figure corresponding put LED at pcb board.
In above-described embodiment, when giving the ac square wave signal of LED lamp bar input equal and opposite in direction, single spin-echo, if the positive half period at the ac square wave signal, LED on the odd positions is simultaneously bright, and the locational LED of even number goes out simultaneously, then at the negative half-cycle of ac square wave signal, the locational LED of even number is simultaneously bright, and the LED on the odd positions goes out simultaneously; According to the variation of ac square wave signal phase, the locational LED of the LED on the odd positions and even number alternately lights.
Because alternating current provides square-wave signal, voltage amplitude is constant, and therefore in a voltage-phase, the luminous brightness preservation of the LED on the odd positions of LED lamp bar is constant, and the luminous brightness of the locational LED of even number also remains unchanged; Because the equal and opposite in direction of ac square wave signal, so that the luminous brightness of the luminous brightness of the LED on the odd positions of LED lamp bar and the locational LED of even number of LED lamp bar is identical, LED-backlit is even, stable luminescence; The single spin-echo of ac square wave signal, so that the LED on the odd positions of LED lamp bar and LED lamp bar by driven, light, and guarantee that LED or the locational LED of even number on the odd positions at any one time light, and display effect is better, and the LED life-span is longer.
The above only is the preferred embodiments of the present invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (7)
1. a led drive circuit is characterized in that, comprises light emitting module and the alternating current first input end and alternating current the second input that are separately positioned on these light emitting module two ends, wherein:
Described light emitting module comprises LED group and the 2nd LED group that two-way is arranged in parallel, and described LED group includes some series connection and the identical LED of conducting direction with the 2nd LED group;
Described LED group is opposite with the conducting direction of the 2nd LED group.
2. led drive circuit as claimed in claim 1 is characterized in that, described alternating current first input end and alternating current the second input are to the ac square wave signal of described light emitting module input equal and opposite in direction, single spin-echo.
3. a LED driving method is characterized in that, comprising:
Will be in parallel by LED group and the 2nd LED group that the identical LED of some conducting directions is in series, form light emitting module, described LED group is opposite with the conducting direction of the 2nd LED group;
Alternating current first input end by being arranged on described light emitting module two ends and alternating current the second input drive described light emitting module to described light emitting module input AC square-wave signal.
4. LED driving method as claimed in claim 3 is characterized in that, described alternating current first input end and alternating current the second input are to the ac square wave signal of described light emitting module input equal and opposite in direction, single spin-echo.
5. LED driving method as claimed in claim 4 is characterized in that, the described light emitting module of described driving is specially:
According to the described LED group of described ac square wave signal driven and the 2nd LED group, described LED group and the 2nd LED group are alternately lighted.
6. a LED lamp bar is characterized in that, comprises a pcb board, comprise led drive circuit as claimed in claim 1 or 2 on this pcb board, wherein, the LED in the described led drive circuit is word order along described pcb board, and the conducting direction of adjacent two described LED is opposite.
7. LED lamp bar as claimed in claim 6 is characterized in that, the distance between adjacent two described LED equates.
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| CN2012103549859A CN102883505A (en) | 2012-09-21 | 2012-09-21 | LED (light-emitting diode) driving circuit, method and LED lamp bar |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN103824547A (en) * | 2014-02-27 | 2014-05-28 | 深圳市华星光电技术有限公司 | Backlight source of liquid crystal display device and driving circuit of backlight source |
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| US9402288B2 (en) | 2014-02-27 | 2016-07-26 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Backlight of liquid crystal display device and driving circuit thereof |
| CN104930387A (en) * | 2015-06-11 | 2015-09-23 | 合肥鑫晟光电科技有限公司 | LED lamp strip structure, controlling method of LED lamp strip structure, backlight module and liquid-crystal display device |
| US9915778B2 (en) | 2015-06-11 | 2018-03-13 | Boe Technology Group Co., Ltd. | LED lamp strip structure and control method thereof, backlight module, liquid crystal display device |
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