CN203134330U - LED display screen backlight brightness adjusting circuit and LED television - Google Patents
LED display screen backlight brightness adjusting circuit and LED television Download PDFInfo
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- CN203134330U CN203134330U CN 201220742396 CN201220742396U CN203134330U CN 203134330 U CN203134330 U CN 203134330U CN 201220742396 CN201220742396 CN 201220742396 CN 201220742396 U CN201220742396 U CN 201220742396U CN 203134330 U CN203134330 U CN 203134330U
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Abstract
The utility model discloses an LED display screen backlight brightness adjusting circuit and an LED television. The LED display screen backlight brightness adjusting circuit outputs detection voltage which increases/decreases along with the increase/decrease of an alternating-current power supply input voltage through a power supply module, and the detection voltage is respectively transmitted to an LED drive module for adjusting the magnitude of a peak value of drive current and to a mainboard module for adjusting pulse adjusting control signals outputted to the LED drive module for adjusting the duty ratio of the drive current. According to the LED display screen backlight brightness adjusting circuit and the LED television, the detection voltage changes correspondingly when the alternating-current power supply input voltage changes and the detection voltage adjusts the duty ratio and the magnitude of the peak value of the drive current of the LED drive module to enable the mean value of the drive current to remain unchanged so as to make the LED backlight brightness remain unchanged; and therefore, a power supply which is identical in mean power, i.e., identical in backlight brightness but relatively small in peak power, can be utilized and the cost of the power supply is reduced.
Description
Technical field
The utility model relates to a kind of display screen technology field, particularly a kind of LED display backlight illumination regulating circuit and LED TV.
Background technology
Because the LED-backlit TV compares with the CCFL TV, environmental protection and energy saving are arranged, characteristics such as colour gamut is wide, the life-span is longer, ultra-thin outward appearance, the LED TV has occupied absolute main flow in market at present.But aspect the control of backlight illumination, LED-backlit still adopts the control model in CCFL stage, and the duty that namely changes the LED electric current is recently regulated brightness backlight, and the shortcoming of this kind scheme is exactly the peak power not variation at any time of power supply.The average power of power supply and peak power and cost are closely related, particularly adopt when instead swashing topological structure, peak value when the power peak of output is than high pressure when low-voltage is imported is little a lot, TV does not generally need to reach just operate as normal of peak power (being peak power output) in addition, thereby the peak power when low-voltage input and high voltage input differs greatly, but the reason owing to the light modulation of TV LED-backlit, if the peak power during with low-voltage and high voltage is consistent, than higher, the power supply cost is corresponding also higher to the performance requirement of power supply for this control model.
The utility model content
Fundamental purpose of the present utility model is for providing a kind of LED TV and LED display backlight illumination regulating circuit thereof that reduces the power supply cost.
The utility model proposes a kind of LED display backlight illumination regulating circuit, comprise power module, mainboard module, LED driver module and LED lamp group, described power module comprises power input and constant voltage output terminal, the power input external AC power supply of described power module, the constant voltage output terminal of described power module connect the constant voltage input end of described mainboard module and the constant voltage input end of described LED driver module respectively; The digital dimming signal end that the control signal end connects described LED driver module is adjusted in the pulse of described mainboard module; The drive output of described LED driver module connects described LED lamp group, described drive output output driving current;
Described power module also comprises the detection voltage output end, and described detection voltage output end output is the detection voltage of lifting/lowering with described power input input voltage lifting/lowering; The detection signal input end of described mainboard module is connected with described detection voltage output end, receives the detection voltage of described power module and according to the detection voltage that receives, exports corresponding pulse adjustment control signal; Described LED driver module is adjusted the dutycycle that control signal is regulated described LED driver module drive current according to the pulse that the digital dimming signal end receives, the simulation dim signal end of described LED driver module with detect voltage output end and link to each other, receive and detect voltage and according to the peak value size of the described LED driver module of detection voltage-regulation drive current.
Preferably, described mainboard module is determined the peak value of LED drive current according to the detection voltage that receives, and is identified for regulating the pulse adjustment control signal of drive current dutycycle according to the ratio of predetermined current and peak point current.
Preferably described LED driver module is used for determining according to the ratio of the detection magnitude of voltage that receives and default LED sample resistance the peak value of LED drive current.
Preferably, described power module also comprises the first anti-violent change depressor, first rectifier bridge, first on-off element, first diode, second diode, first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity, first resistance and second resistance;
The described first anti-violent change depressor comprises first primary coil and first secondary coil, first end of described first primary coil and first end of described first secondary coil are end of the same name, the cathode output end of described first rectifier bridge of first termination of described first primary coil, first end of described first primary coil is also through described first capacity earth, and second end of described first primary coil is through the described first element ground connection of opening the light;
The first end ground connection of described first secondary coil, second end of described first secondary coil connect the positive pole of described first diode and the negative pole of described second diode respectively; The negative pole of described first diode connects an end and the described constant voltage output terminal of described first resistance on the one hand respectively, on the other hand through described second capacity earth;
An anodal end that connects described second resistance on the one hand of described second diode is on the other hand through described the 3rd capacity earth; The other end of the other end of described first resistance and described second resistance all is connected with described detection voltage output end on the other hand on the one hand all through described the 4th capacity earth; The cathode output end ground connection of described first rectifier bridge, the input end external AC power supply of described first rectifier bridge.
Preferably, described first on-off element comprises NMOS pipe and first power supply chip, and the drain electrode of a described NMOS pipe connects second end of the described first anti-violent change depressor, the source ground of a described NMOS pipe; Described first power supply chip connects the grid of a described NMOS pipe, the conducting of controlling a described NOMS pipe with end.
Preferably, described power module also comprises the second anti-violent change depressor, second rectifier bridge, second open the light element, the 3rd diode, the 4th diode, the 5th electric capacity, the 6th electric capacity and the 7th electric capacity;
The described second anti-violent change depressor comprises second primary coil, with described second primary coil around to opposite second subprime coil and with described second primary coil around to the identical coil of level for the third time, first end of described second primary coil and first end of described second subprime coil are end of the same name, first end of first end of described second primary coil and the described coil of level for the third time is end of the same name, first end of described second primary coil connects the cathode output end of described second rectifier bridge, first end of described second primary coil is also through described the 5th capacity earth, and second end of described second primary coil is through described second switch element ground connection;
Second end of first end of described second subprime coil and the described coil of level for the third time is ground connection all; Second end of described second subprime coil connects the positive pole of described the 3rd diode, and the negative pole of described the 3rd diode connects described constant voltage output terminal, and the negative pole of described the 3rd diode is also through described the 6th capacity earth; First end of the described coil of level for the third time connects the positive pole of described the 4th diode, and the negative pole of described the 4th diode connects described detection voltage output end, and the negative pole of described the 4th diode is also through described the 7th capacity earth; The cathode output end ground connection of described second rectifier bridge, the input end external AC power supply of described second rectifier bridge.
Preferably, described second switch element comprises the 2nd NMOS pipe and second source chip, and the drain electrode of described the 2nd NMOS pipe connects second end of the described second anti-violent change depressor, the source ground of described the 2nd NMOS pipe; Described second source chip connects the grid of described the 2nd NMOS pipe, the conducting of controlling described the 2nd NOMS pipe with end.
The utility model also proposes a kind of LED TV, comprises aforesaid LED display backlight illumination regulating circuit.
LED TV of the present utility model and LED display backlight illumination regulating circuit thereof, when the AC power input voltage changes, variation according to the AC power input voltage, the detection voltage of power module output respective change, according to detecting voltage dutycycle and the peak value size of the drive current of LED driver module are regulated, make that the mean value of the drive current that the LED driver module is exported is constant, thereby it is constant to reach LED-backlit brightness; Therefore LED display backlight illumination regulating circuit can be identical with average power, be that backlight illumination is identical, but the less power supply of peak power reduces the cost of power supply.
Description of drawings
Fig. 1 is the structural representation of the utility model LED display backlight illumination regulating circuit one embodiment;
Fig. 2 is the circuit diagram of power module among another embodiment of the utility model LED display backlight illumination regulating circuit;
Fig. 3 is the circuit diagram of power module among the another embodiment of the utility model LED display backlight illumination regulating circuit.
The realization of the utility model purpose, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
As shown in Figure 1, Fig. 1 is the structural representation of the utility model LED display backlight illumination regulating circuit one embodiment, the LED display backlight illumination regulating circuit that this embodiment provides, comprise power module 10, mainboard module 20, LED driver module 30 and LED lamp group 40, power module 10 comprises two power input VIN and constant voltage output terminal VOUT, the power input VIN of power module 10 connects AC power, and the constant voltage output terminal VOUT of power module 10 connects the constant voltage input end of mainboard module 20 and the constant voltage input end of LED driver module 30 respectively; The level control end of mainboard module 20 connects the Enable Pin of LED driver module 30, the Enable Pin that mainboard module 20 is given LED driver module 30 in the TV operate as normal by over level control end output high level signal, LED driver module 30 is according to receiving the high level signal output driving current, and the digital dimming signal end that the control signal end connects LED driver module 30 is adjusted in the pulse of mainboard module 20; The drive output of LED driver module 30 connects LED lamp group 40, drive output output driving current;
The LED display backlight illumination regulating circuit that present embodiment proposes, by energy of power module 10 output with the input voltage lifting/lowering detection voltage of lifting/lowering, deliver in the mainboard module 20 according to the size that detects voltage detecting voltage, export corresponding pulse and adjust control signal to the digital dimming signal end of LED driver module 30, adjust the dutycycle of drive current; Deliver to the simulation dim signal end of LED driver module 30 with detecting voltage, according to the size that detects voltage, adjust the peak value size of LED driver module 30 drive currents.Concrete, when input voltage reduces, detecting voltage also reduces, the peak drive current of LED driver module 30 descends, the pulse of mainboard module 20 outputs is adjusted control signal to the digital dimming signal end, and the dutycycle of regulating drive current increases (average driving current of LED driver module 30 outputs equals peak drive current and multiply by dutycycle), guarantees that the average driving current of LED driver module 30 is constant, keep the average power of LED constant, make the whole backlight illumination of display screen constant; When input voltage raises, detect voltage and raise, the peak drive current of LED driver module 30 rises, the dutycycle of drive current reduces, the average driving current that guarantees LED driver module 30 is constant, keeps the average power of LED constant, guarantees that namely the whole backlight illumination of LED display is constant.
The size of the detection voltage in the present embodiment, exporting corresponding pulse adjustment control signal is specially: mainboard module obtains the peak value of LED drive current according to the detection voltage that receives and the ratio of the LED sample resistance of presetting, and obtain the dutycycle of drive current according to the ratio of predetermined current value and peak point current, and it is adjusted control signal as pulse.When the detection voltage that receives when the detection signal input end reduces, the dutycycle of the pulse adjustment control signal of output is increased accordingly, in the present embodiment, when minimum voltage is imported, the dutycycle that control signal is adjusted in pulse is 1, and along with the rising of input voltage, dutycycle can diminish, but the peak point current of crest voltage correspondence and the product of dutycycle equal the predetermined current value, so just can guarantee that the average current of drive current remains unanimity when input voltage changes.
Further, mainboard module 20 also can adjusted pulse and adjusting outside the control signal according to detecting voltage swing, and also the brightness of the module backlight that can arrange according to the user is adjusted pulse and adjusted the control signal dutycycle.
The LED display backlight illumination regulating circuit of present embodiment, when the AC power input voltage changes, variation according to power input voltage, the detection voltage of power module 10 output respective change, according to detecting voltage dutycycle and the peak value size of the drive current of LED driver module 30 are carried out fit adjustment, make that the mean value of the drive current that LED driver module 30 is exported is constant, thereby it is constant to reach LED-backlit brightness.Make LED display backlight illumination regulating circuit can be identical with average power, be that backlight illumination is identical, but peak power reduces, and can use the less power supply of peak power like this, reduces the cost of power supply.
As shown in Figure 2, Fig. 2 is the circuit diagram of power module among another embodiment of the utility model LED display backlight illumination regulating circuit, present embodiment is based on an embodiment, and the present embodiment power module also comprises the first anti-violent change depressor T1, the first rectifier bridge BD1, first on-off element, the first diode D1, the second diode D2, first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, first resistance R 1 and second resistance R 2;
The first anti-violent change depressor T1 comprises first primary coil and first secondary coil, first end 3 of first end 1 of first primary coil and first secondary coil is end of the same name, first end 1 of first primary coil connects the cathode output end of the first rectifier bridge BD1, first end 1 of first primary coil is also through first capacitor C, 1 ground connection, and second end 2 of first primary coil is through the first element ground connection of opening the light;
First end, 3 ground connection of first secondary coil, second end 4 of first secondary coil connects the positive pole of the first diode D1 and the negative pole of the second diode D2 respectively; The negative pole of the first diode D1 connects an end and the constant voltage output terminal VOUT of first resistance R 1 respectively, and through second capacitor C, 2 ground connection;
The positive pole of the second diode D2 connects an end of second resistance R 2, and through the 3rd capacitor C 3 ground connection; The other end of the other end of first resistance R 1 and second resistance R 2 is all through the 4th capacitor C 4 ground connection, and all with detect voltage output end VSENS and be connected; The cathode output end ground connection of the first rectifier bridge BD1, the input end external AC power supply of the first rectifier bridge BD1.
First on-off element comprises NMOS pipe Q1 and the first power supply chip IC1, and the drain electrode of NMOS pipe Q1 connects second end of the first anti-violent change depressor T1, the source ground of NMOS pipe Q1; The first power supply chip IC1 connects the grid of NMOS pipe Q1, the conducting of controlling a NOMS pipe with end.In order under powerful situation, to use, also can between the leakage level of NMOS pipe Q1 and source class, set up an individual diodes; First on-off element also can be on-off elements such as triode simultaneously.
Concrete, the principle of work of present embodiment is as follows:
When NMOS pipe Q1 conducting, the first anti-violent change depressor T1 storage power, first end 3 of first secondary coil is for just, second end 4 of first secondary coil is for bearing the first not conducting of diode D1, the second diode D2 conducting, the 3rd capacitor C 3 stored energys, the top crown of the 3rd capacitor C 3 is for negative.When NMOS pipe Q1 ends, the first anti-violent change depressor T1 releases energy, first end 3 of first secondary coil is for negative, second end 4 of first secondary coil is for just, the first diode D1 conducting, constant voltage output terminal VOUT exports supply voltage, the second not conducting of diode D2, second capacitor C, 2 storage power, the top crown of second capacitor C 2 is for just, because step is for negative on the 3rd capacitor C 3, then second capacitor C 2 and the 3rd capacitor C 3 form path, the VOUT voltage that descends after first resistance R 1, the size that detects voltage just equals the magnitude of voltage of first resistance R 1 and second resistance R, 2 links, can control by the resistance proportionate relationship of first resistance R 1 and second resistance R 2 and detect the detection voltage swing that voltage output end VSENS exports.
As shown in Figure 3, Fig. 3 is the circuit diagram of power module among the another embodiment of the utility model LED display backlight illumination regulating circuit, present embodiment is based on an embodiment, and the present embodiment power module also comprises the second anti-violent change depressor T2, the second rectifier bridge BD2, second open the light element, the 3rd diode D3, the 4th diode D4, the 5th capacitor C 5, the 6th capacitor C 6 and the 7th capacitor C 7;
The second anti-violent change depressor T2 comprises second primary coil, one with second primary coil around to opposite second subprime coil and one and second primary coil around to the identical coil of level for the third time, first end 5 of second primary coil is end of the same name with first end 7 of second subprime coil, first end 5 of second primary coil is end of the same name with first end 9 of level coil for the third time, first end 5 of second primary coil connects the cathode output end of the second rectifier bridge BD2, first end 5 of second primary coil is also through the 5th capacitor C 5 ground connection, and second end 6 of first primary coil is through second switch element ground connection;
First end 7 of second subprime coil and second end 10 ground connection all of level coil for the third time; Second end 8 of second subprime coil connects the positive pole of the 3rd diode D3, and the negative pole of the 3rd diode D3 connects constant voltage output terminal VOUT, and the negative pole of the 3rd diode D3 is also through the 6th capacitor C 6 ground connection; First end 9 of level coil connects the positive pole of the 4th diode D4 for the third time, and the negative pole of the 4th diode D4 connects detection voltage output end VSENS, and the negative pole of the 4th diode D4 is also through the 7th capacitor C 7 ground connection; The cathode output end ground connection of the second rectifier bridge BD2, the input end external AC power supply of the second rectifier bridge BD2.
The second switch element comprises that the drain electrode of the 2nd NMOS pipe Q2 and second source chip IC 2, the two NMOS pipe Q2 connects second end of the second anti-violent change depressor T2, the source ground of the 2nd NMOS pipe Q2; Second source chip IC 2 connects the grid of the 2nd NMOS pipe Q2, the conducting of controlling the 2nd NOMS pipe with end.In order under powerful situation, to use, also can between the leakage level of the 2nd NMOS pipe Q2 and source class, set up an individual diodes; The second switch element also can be on-off elements such as triode simultaneously.
Concrete, the principle of work of present embodiment is as follows: when the 2nd NMOS pipe Q2 conducting, and the second anti-violent change depressor T2 storage power, first end 7 of second subprime coil is for just, and second end 8 of second subprime coil is for bearing the 3rd not conducting of diode D3; First end 9 of level coil is for just for the third time, and second end 10 of level coil is for negative for the third time, and the 4th diode D4 conducting detects voltage output end VSENS output and detects voltage, the 7th capacitor C 7 storage power of charging.When the 2nd NMOS pipe Q2 by the time, first end 7 of second subprime coil is for negative, second end 8 of second subprime coil is being for just, the 3rd diode D3 conducting, power supply output terminal output supply voltage, the 6th capacitor C 6 storage power of charging; First end 9 of level coil is for negative for the third time, and second end 10 of level coil is being for just for the third time, the 4th not conducting of diode D4, and 7 discharges of the 7th capacitor C detect voltage output end VSENS output detection voltage.
According to the principle of work of anti-violent change depressor, when anti-violent change depressor elementary with secondary coil turn ratio when being N/1, the voltage ratio at the two ends of primary coil and secondary coil also is N.With reference to Fig. 3, (voltage of supposing 5,6 two ends is V1, and the voltage at 7,8 two ends is V2, and the voltage at 9,10 two ends is V3, and the input voltage of AC power is Vin), then V1/(V2+|V3|)=N, therefore | V3|=(V1-V2*N)/N.In addition, V1 be input voltage vin and second subprime voltage reflection to elementary voltage Vf(namely when Q2 is in cut-off state among Fig. 3, then the voltage V2 of constant voltage output terminal VOUT can reflex on second primary coil) sum, wherein | Vf|=V2*N, be V1=Vin+|Vf|=Vin+V2*N, therefore | V3|=(V1-V2*N)/N=Vin/N.Therefore absolute value and the proportional relation of input voltage of voltage V3, i.e. input voltage vin height, | V3| voltage is also high, and vice versa.Herein | V3| has just obtained detection voltage through overcommutation, filtering, and the height that therefore detects voltage also can reflect the height of input voltage.
The utility model also proposes a kind of LED TV, comprise LED display backlight illumination regulating circuit, technical scheme among all embodiment in the diagram 1 to Fig. 3 before this LED display backlight illumination regulating circuit can comprise, its concrete structure can be with reference to previous embodiment, do not do at this and give unnecessary details.
The above only is preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model instructions 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 utility model.
Claims (8)
1. LED display backlight illumination regulating circuit, comprise power module, mainboard module, LED driver module and LED lamp group, described power module comprises power input and constant voltage output terminal, the power input external AC power supply of described power module, the constant voltage output terminal of described power module connect the constant voltage input end of described mainboard module and the constant voltage input end of described LED driver module respectively; The digital dimming signal end that the control signal end connects described LED driver module is adjusted in the pulse of described mainboard module; The drive output of described LED driver module connects described LED lamp group, described drive output output driving current; It is characterized in that,
Described power module also comprises the detection voltage output end, and described detection voltage output end output is the detection voltage of lifting/lowering with described power input input voltage lifting/lowering; The detection signal input end of described mainboard module is connected with described detection voltage output end, receives the detection voltage of described power module and according to the detection voltage that receives, exports corresponding pulse adjustment control signal; Described LED driver module is adjusted the dutycycle that control signal is regulated described LED driver module drive current according to the pulse that the digital dimming signal end receives, the simulation dim signal end of described LED driver module with detect voltage output end and link to each other, receive and detect voltage and according to the peak value size of the described LED driver module of detection voltage-regulation drive current.
2. LED display backlight illumination regulating circuit according to claim 1, it is characterized in that, described mainboard module is determined the peak value of LED drive current according to the detection voltage that receives, and is identified for regulating the pulse adjustment control signal of drive current dutycycle according to the ratio of predetermined current and peak point current.
3. LED display backlight illumination regulating circuit according to claim 1 is characterized in that: described LED driver module is used for determining according to the ratio of the detection magnitude of voltage that receives and default LED sample resistance the peak value of LED drive current.
4. according to each described LED display backlight illumination regulating circuit among the claim 1-3, it is characterized in that described power module also comprises the first anti-violent change depressor, first rectifier bridge, first on-off element, first diode, second diode, first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity, first resistance and second resistance;
The described first anti-violent change depressor comprises first primary coil and first secondary coil, first end of described first primary coil and first end of described first secondary coil are end of the same name, the cathode output end of described first rectifier bridge of first termination of described first primary coil, first end of described first primary coil is also through described first capacity earth, and second end of described first primary coil is through the described first element ground connection of opening the light;
The first end ground connection of described first secondary coil, second end of described first secondary coil connect the positive pole of described first diode and the negative pole of described second diode respectively; The negative pole of described first diode connects an end and the described constant voltage output terminal of described first resistance on the one hand respectively, on the other hand through described second capacity earth;
An anodal end that connects described second resistance on the one hand of described second diode is on the other hand through described the 3rd capacity earth; The other end of the other end of described first resistance and described second resistance all is connected with described detection voltage output end on the other hand on the one hand all through described the 4th capacity earth; The cathode output end ground connection of described first rectifier bridge, the input end external AC power supply of described first rectifier bridge.
5. LED display backlight illumination regulating circuit according to claim 4, it is characterized in that, described first on-off element comprises NMOS pipe and first power supply chip, the drain electrode of a described NMOS pipe connects second end of the described first anti-violent change depressor, the source ground of a described NMOS pipe; Described first power supply chip connects the grid of a described NMOS pipe, the conducting of controlling a described NOMS pipe with end.
6. according to each described LED display backlight illumination regulating circuit among the claim 1-3, it is characterized in that described power module also comprises the second anti-violent change depressor, second rectifier bridge, second open the light element, the 3rd diode, the 4th diode, the 5th electric capacity, the 6th electric capacity and the 7th electric capacity;
The described second anti-violent change depressor comprises second primary coil, with described second primary coil around to opposite second subprime coil and with described second primary coil around to the identical coil of level for the third time, first end of described second primary coil and first end of described second subprime coil are end of the same name, first end of first end of described second primary coil and the described coil of level for the third time is end of the same name, first end of described second primary coil connects the cathode output end of described second rectifier bridge, first end of described second primary coil is also through described the 5th capacity earth, and second end of described second primary coil is through described second switch element ground connection;
Second end of first end of described second subprime coil and the described coil of level for the third time is ground connection all; Second end of described second subprime coil connects the positive pole of described the 3rd diode, and the negative pole of described the 3rd diode connects described constant voltage output terminal, and the negative pole of described the 3rd diode is also through described the 6th capacity earth; First end of the described coil of level for the third time connects the positive pole of described the 4th diode, and the negative pole of described the 4th diode connects described detection voltage output end, and the negative pole of described the 4th diode is also through described the 7th capacity earth; The cathode output end ground connection of described second rectifier bridge, the input end external AC power supply of described second rectifier bridge.
7. LED display backlight illumination regulating circuit according to claim 6, it is characterized in that, described second switch element comprises the 2nd NMOS pipe and second source chip, the drain electrode of described the 2nd NMOS pipe connects second end of the described second anti-violent change depressor, the source ground of described the 2nd NMOS pipe; Described second source chip connects the grid of described the 2nd NMOS pipe, the conducting of controlling described the 2nd NOMS pipe with end.
8. a LED TV is characterized in that, comprises as each described LED display backlight illumination regulating circuit among the claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220742396 CN203134330U (en) | 2012-12-28 | 2012-12-28 | LED display screen backlight brightness adjusting circuit and LED television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220742396 CN203134330U (en) | 2012-12-28 | 2012-12-28 | LED display screen backlight brightness adjusting circuit and LED television |
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| CN203134330U true CN203134330U (en) | 2013-08-14 |
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| CN 201220742396 Expired - Fee Related CN203134330U (en) | 2012-12-28 | 2012-12-28 | LED display screen backlight brightness adjusting circuit and LED television |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104766567A (en) * | 2015-03-18 | 2015-07-08 | 康佳集团股份有限公司 | LED backlight driving circuit and brightness regulating method of LED backlight |
| CN105448248A (en) * | 2016-01-15 | 2016-03-30 | 深圳市华星光电技术有限公司 | A power conditioning circuit and a liquid crystal display apparatus |
| CN105764185A (en) * | 2016-03-18 | 2016-07-13 | 深圳Tcl数字技术有限公司 | AC driving mixed dimming circuit and television |
| CN106878777A (en) * | 2017-02-17 | 2017-06-20 | 昆山康佳电子有限公司 | The television set and regulating system of induced environment adjusting backlight luminance |
| CN108564924A (en) * | 2018-03-22 | 2018-09-21 | 昆山龙腾光电有限公司 | Backlight regulating circuit and backlight adjusting method |
| CN113314065A (en) * | 2021-06-04 | 2021-08-27 | 豪威触控与显示科技(深圳)有限公司 | Driving method, pixel circuit and display panel |
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2012
- 2012-12-28 CN CN 201220742396 patent/CN203134330U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104766567A (en) * | 2015-03-18 | 2015-07-08 | 康佳集团股份有限公司 | LED backlight driving circuit and brightness regulating method of LED backlight |
| CN105448248A (en) * | 2016-01-15 | 2016-03-30 | 深圳市华星光电技术有限公司 | A power conditioning circuit and a liquid crystal display apparatus |
| WO2017120995A1 (en) * | 2016-01-15 | 2017-07-20 | 深圳市华星光电技术有限公司 | Power regulation circuit and liquid crystal display device |
| CN105448248B (en) * | 2016-01-15 | 2018-05-08 | 深圳市华星光电技术有限公司 | Power conditioning circuitry and liquid crystal display device |
| CN105764185A (en) * | 2016-03-18 | 2016-07-13 | 深圳Tcl数字技术有限公司 | AC driving mixed dimming circuit and television |
| CN106878777A (en) * | 2017-02-17 | 2017-06-20 | 昆山康佳电子有限公司 | The television set and regulating system of induced environment adjusting backlight luminance |
| CN108564924A (en) * | 2018-03-22 | 2018-09-21 | 昆山龙腾光电有限公司 | Backlight regulating circuit and backlight adjusting method |
| CN113314065A (en) * | 2021-06-04 | 2021-08-27 | 豪威触控与显示科技(深圳)有限公司 | Driving method, pixel circuit and display panel |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20130814 Termination date: 20201228 |