CN101276074A - LCD, backlight module and light source drive control device - Google Patents

LCD, backlight module and light source drive control device Download PDF

Info

Publication number
CN101276074A
CN101276074A CNA2007100884619A CN200710088461A CN101276074A CN 101276074 A CN101276074 A CN 101276074A CN A2007100884619 A CNA2007100884619 A CN A2007100884619A CN 200710088461 A CN200710088461 A CN 200710088461A CN 101276074 A CN101276074 A CN 101276074A
Authority
CN
China
Prior art keywords
light source
signal
control device
source drive
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2007100884619A
Other languages
Chinese (zh)
Inventor
张裕青
陈俊宏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delta Electronics Inc
Delta Optoelectronics Inc
Original Assignee
Delta Optoelectronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Delta Optoelectronics Inc filed Critical Delta Optoelectronics Inc
Priority to CNA2007100884619A priority Critical patent/CN101276074A/en
Publication of CN101276074A publication Critical patent/CN101276074A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Liquid Crystal Display Device Control (AREA)

Abstract

The present invention provides a plurality of luminescence units driven by a light source driving controller, including a power supply unit and a feedback control unit. The power supply unit is electrically connected to the luminescence unit, and output a driving signal to drive the luminescence unit. The feedback control unit is electrically connected to the power supply unit and between any two luminescence units, capturing a feedback signal of the luminescence unit to generate a pwm signal to control the luminescence unit.

Description

LCD, backlight module and light source drive control device thereof
Technical field
The present invention relates to a kind of LCD, backlight module and light source drive control device thereof.
Background technology
Light emitting diode (Light Emitting Diode, LED) because of having that power consumption is low, the life-span is long and advantage such as colour saturation is good, be widely used in daily life and the electronic product, and abundant three primary colors colour temperature and high-luminous-efficiency are arranged because of it possesses, thereby be used in gradually in the backlight liquid crystal display module, as the source of lighting source.
Please refer to shown in Figure 1ly, is the circuit diagram of existing light source drive control device 1, and it comprises a current supply 11, a light emitting diode string 12, a comparer OP 1, a controller 13 and a switch 14.These current supply 11 outputs one current drive signal S 11To this light emitting diode string 12.This comparer OP 1Compare a current reference signal S 131And acquisition is from a current signal S of this light emitting diode string 12 12, and export a comparison signal S according to this 132To this controller 13; This controller 13 receives this comparison signal S 132And be converted into a control signal S 13(for example: pulse-width signal) export; This switch 14 is according to this control signal S 13Come conducting (turn on) or end (turn off), to control the brightness of this light emitting diode string 12.
As mentioned above, said method is the current signal S by acquisition autoluminescence diode string 12 12With current reference signal S 131Compare brightness with control light emitting diode string 12.Yet, utilize electric current as the luminous foundation of control light emitting diode string 12, be subjected to the unsettled influence of current drive signal S11 easily, and cause accurate biased the moving of electric current, thereby be not easy to control the brightness of light emitting diode string 12, and when light emitting diode string 12 numbers in parallel increased, the power that resistor R consumed of connecting with light emitting diode string 12 in the light source drive control device 1 also increased thereupon, thereby causes unnecessary power consumption.
Be with, how a kind of LCD, backlight module and the light source drive control device thereof that can accurately control light emitting diode string brightness and reduce power consumption is provided, real is one of current important topic.
Summary of the invention
Because above-mentioned problem, purpose of the present invention is for providing a kind of LCD, backlight module and the light source drive control device thereof that can accurately control light emitting diode string brightness and reduce power consumption.
Edge is, for reaching above-mentioned purpose, according to a kind of light source drive control device of the present invention, it drives a plurality of luminescence units, and this driving control device comprises a power-supply unit and a feedback control unit.This power-supply unit electrically connects described luminescence unit, and exports a drive signal to drive described luminescence unit.This feedback control unit electrically connects between this power-supply unit and wantonly two luminescence units, and captures a feedback signal to produce a pulse-width signal to control described luminescence unit.
In addition, for reaching above-mentioned purpose, comprise a backboard and a light source drive control device according to a kind of backlight module of the present invention.This backboard has an accommodation space, and this light source drive control device is arranged in this accommodation space, and drives a plurality of luminescence units.This light source drive control device comprises a power-supply unit and a feedback control unit.This power-supply unit electrically connects described luminescence unit, and exports a drive signal to drive described luminescence unit.This feedback control unit electrically connects between this power-supply unit and wantonly two luminescence units, and captures a feedback signal to produce a pulse-width signal to control described luminescence unit.
Moreover, for reaching above-mentioned purpose, comprise that according to a kind of LCD of the present invention a display panels and has the backlight module of a light source drive control device, wherein, this display panels is arranged on a side of this backlight module.This light source drive control device drives a plurality of luminescence units, and has a power-supply unit and a feedback control unit.This power-supply unit electrically connects described luminescence unit, and exports a drive signal to drive described luminescence unit.This feedback control unit electrically connects between this power-supply unit and wantonly two luminescence units, and captures a feedback signal to produce a pulse-width signal to control described luminescence unit.
From the above, LCD of the present invention, backlight module and light source drive control device thereof are to utilize this feedback control unit to electrically connect between two luminescence units in office, to capture this feedback signal.Compare with existing, the present invention can obtain this required feedback signal via the simple designs of this feedback control unit, reaches the brightness of accurate this luminescence unit of regulation and control and reduces unnecessary power consumption by Current Feedback Control produced.
Description of drawings
Fig. 1 is the circuit diagram of existing light source drive control device;
Fig. 2 is the block schematic diagram according to the light source drive control device of preferred embodiment of the present invention;
Fig. 3 is the circuit diagram according to the light source drive control device of preferred embodiment of the present invention; And
Fig. 4 is the structural representation according to the liquid crystal indicator of preferred embodiment of the present invention.
The reference numeral explanation:
1 light source drive control device, 11 current supplies
12 light emitting diode string, 13 controllers
14 switches, 2 light source drive control devices
21 power-supply units, 22 feedback control units
221 bleeder circuits, 222 comparator circuits
223 pulse-width modulation circuits, 224 filtering circuits
23 switch elements, 24 temperature sense control unit
3 LCD, 31 display panels
311 incidence surfaces, 32 backlight modules
321 backboards, 322 light source drive control devices
323 diffuser plate C electric capacity
J 1Oscillator L 1, L 2Luminescence unit
OP 1, U 1, U 2Comparer R, R 1-R 3, the RT resistor
Q 1-Q 3Switch module
S 11Current drive signal S 12Current signal
S 13Control signal S 131Current reference signal
S 132Comparison signal S 21Drive signal
S 22Feedback signal S 221Reference voltage signal
S 222Comparison signal S 223Oscillator signal
S 23Pulse-width signal S 24Sense control signal
SP 1Accommodation space
Embodiment
Hereinafter with reference to correlative type, LCD, backlight module and light source drive control device thereof according to preferred embodiment of the present invention are described.
Please refer to Fig. 2 and shown in Figure 3, wherein, Fig. 2 is the block schematic diagram of a light source drive control device 2 of the present invention, and Fig. 3 is the circuit diagram of the light source drive control device 2 among Fig. 2.
This light source drive control device 2 drives a plurality of luminescence unit L 1, and this light source drive control device 2 and comprise a power-supply unit 21, a feedback control unit 22, a switch element 23 and a temperature sense control unit 24.In the present embodiment, described luminescence unit L 1Can be embodied as light emitting diode.
These power-supply unit 21 outputs one drive signal S 21To described luminescence unit L 1And this feedback control unit 22.This feedback control unit 22 is electrically connected at wantonly two luminescence unit L 1Between to capture a feedback signal S 22, and export a pulse-width signal S according to this 23, these 24 sensing one environment temperatures in temperature sense control unit are to produce a sense control signal S 24This switch element 23 is according to this pulse-width signal S 23And this sense control signal S 24Control the described luminescence unit L that flows through 1Electric current, to regulate and control described luminescence unit L 1Brightness.In the present embodiment, this drive signal S 21, this feedback signal S 22, this pulse-width signal S 23And this sense control signal S 24Be respectively a voltage signal.
Referring again to shown in Figure 3, this feedback control unit 22 has a bleeder circuit 221, a comparator circuit 222 and a pulse-width modulation circuit 223.
This bleeder circuit 221 has one first resistor R 1And one second resistor R 2, and this first resistor R 1And this second resistor R 2Be connected in series between this this power-supply unit 21 and the ground end.This drive signal S that 221 pairs of these power-supply units 21 of this bleeder circuit are exported 21Carry out dividing potential drop to produce a reference voltage signal S 221
This comparator circuit 222 has one first comparer U 1, this first comparer U 1This feedback signal S relatively 22And this reference voltage signal S 221To export a comparison signal S 222In the present embodiment, this first comparer U 1Be an operational amplifier or any assembly or circuit with comparing function, and this reference voltage signal S 221And this comparison signal S 222Be respectively a voltage signal.
This pulse-width modulation circuit 223 has an oscillator J 1And one second comparer U 2This oscillator J 1Export an oscillator signal S 223To this second comparer U 2, and this second comparer U 2This oscillator signal S relatively 223And this comparison signal S 222, and export this pulse-width signal S according to this 23Wherein, this oscillator signal S 223Can be a triangular wave or a sawtooth wave.In addition, this second comparer U 2Be an operational amplifier or any assembly or circuit with comparing function.
The person of noting, the function of utilizing electronic package to reach this pulse-width modulation circuit 223 has belonged to proven technique, at this is that this pulse-width modulation circuit 223 of being formed with this comparer U2 and this oscillator J1 is an example, but be not limited in this, it also can utilize control chip to reach 223 effects that can reach of above-mentioned this pulse-width modulation circuit.
This switch element 23 has one first switch module Q 1, a second switch assembly Q 2And one the 3rd switch module Q 3This first switch module Q wherein 1Electrically connect this luminescence unit L respectively 1And this second switch assembly Q 2, this second switch assembly Q 2Electrically connect this first switch module Q respectively 1And the 3rd switch module Q 3, the 3rd switch module Q 3Electrically connect this second switch assembly Q respectively 2, this feedback control circuit 22 and this temperature sense control unit 24.In the present embodiment, above-mentioned described switch module Q 1-Q 3Can be respectively a two-carrier junction transistor, a mos field effect transistor or any assembly or circuit with switching function.
Referring again to shown in Figure 3, this power-supply unit 21 this drive signal of output S 21, and this bleeder circuit 221 in this feedback control unit 22 receives this drive signal S 21And export this reference voltage signal S 221This first comparer U in this comparator circuit 222 1This reference voltage signal S relatively 221And acquisition is from wantonly two luminescence unit L 1Between this feedback signal S 22, to export this comparison signal S 222This second comparer U to this pulse-width modulation circuit 223 2This second comparer U 2This oscillator J relatively 1This oscillator signal S that is exported 223And this first comparer U 1This comparison signal S of output 222, to export this pulse-width signal S 23This pulse-width signal S 23Via the 3rd switch module Q 3And this second switch assembly Q 2And be sent to this first switch module Q 1, and control this first switch module Q according to this 1Conducting or end.By this first switch element Q 1Conducting or end and regulate and control to flow through described luminescence unit L 1Current value, to control described luminescence unit L 1Brightness.
Wherein, this second switch unit Q 2The 3rd switch element Q connects 3Promptly have with the door (AND) circuit function, it can be used to detect described luminescence unit L 1Whether normally operate.As above-mentioned switch element Q 2, Q 3During conducting simultaneously, this pulse-width signal S 23Just can be sent to this first switch module Q 1If described switch element Q 2, Q 3One of them by the time, this pulse-width signal S then 23Can't be sent to this first switch module Q 1In addition, as described luminescence unit L 1Because of opening circuit or temperature is crossed high factor and caused operating when undesired, this second switch unit Q then 2Also can end, cause 23 of this feedback control unit 22 and this switch elements to open circuit, make this pulse-width signal S 23Can't transmit, to reach the function of circuit protection.
In the present embodiment, for fear of this feedback signal S 22Carry noise secretly, and make feedback control unit 22 produce misoperation, then this feedback control circuit 22 more can comprise a filtering circuit 224.This filtering circuit 224 receives wantonly two luminescence unit L 1Between this feedback signal S 22And it is carried out filtering.In the present embodiment, this filtering circuit 224 is by one the 3rd resistor R 3Reach the low-pass filter circuit that a capacitor C is formed.Yet the enforcement aspect of low-pass filter circuit is numerous, only is illustrative at this, is not only limited and can use the RC low-pass filter circuit.
This temperature sense control unit 24 can have a thermal resistor RT (as shown in the figure), a thermal coupler (Thermocopuler) or any can generation according to variation of ambient temperature and feel control signal S 24Assembly.Wherein, this thermal resistor RT can be a positive temperature coefficient thermistor or a negative temperature coefficient thermistor again.
In the present embodiment, in order to protect this light source drive control device 2,, then can make these temperature sense control unit 24 these senses of output control signal S when this thermal resistor RT of this temperature sense control unit 24 senses ambient temperature when too high 24To the 3rd switch module Q 3, and make the 3rd switch module Q 3End, cause 23 of this feedback control unit 22 and this switch elements to open circuit, thereby cut off the loop of this light source drive control device 2 automatically, to reach the function of temperature sensing and circuit protection.
Then, please refer to backlight module and the LCD of Fig. 4 with explanation preferred embodiment of the present invention.
Fig. 4 is the structural representation of a kind of LCD 3 of the present invention, and this LCD 3 comprises a display panels 31 and a backlight module 32, and wherein, this display panels 31 and this backlight module 32 are relative and establish.In the present embodiment, this backlight module 32 is an example with the bottom-lighting type back light module.
This backlight module 32 has a backboard 321, a light source drive control device 322 and a diffuser plate 323.Wherein, this backboard 321 has an accommodation space SP 1, and this light source drive control device 322 is arranged on this accommodation space SP 1In, and drive a plurality of luminescence unit L 2Those luminescence units L 2Launch the incidence surface 311 that a light enters this display panels 31 after via 323 diffusions of this diffuser plate respectively, to provide this display panels 31 required light source.
In the present embodiment, this light source drive control device 322 of this backlight module 32 can be described this light source drive control device 2 of previous embodiment, this luminescence unit L 2Can with this luminescence unit L of the foregoing description 1Have identical functions, structure and relation is set, so no longer add to give unnecessary details at this.
What deserves to be mentioned is that in the present embodiment, not limiting this backlight module 32 is direct type backlight modules, it also can be a side light type back light module certainly.In addition, the structural arrangements of this light source drive control device 322 only is an illustrative also, is not defined as structural arrangements shown in Figure 4 at this, and the meaning i.e. electrical connection that only need possess therebetween of the structural arrangements of this light source drive control device 322 gets final product.
In sum, LCD of the present invention, backlight module and light source drive control device thereof utilize this feedback control unit to electrically connect between two luminescence units in office, to capture this feedback signal.Compare with prior art, the present invention can obtain this required feedback signal via the simple designs of this feedback control unit, reaches the brightness of accurate this luminescence unit of regulation and control and reduces unnecessary power consumption by Current Feedback Control produced.
The above only is an illustrative, but not is restricted person.Anyly do not break away from spirit of the present invention and category, and, all should be included in the claim of the present invention its equivalent modifications of carrying out or change.

Claims (22)

1. light source drive control device, it drives a plurality of luminescence units, and this light source drive control device comprises:
One power-supply unit connects described luminescence unit electrically, and exports a drive signal to drive described luminescence unit; And
One feedback control unit connects electrically between this power-supply unit and wantonly two luminescence units, and captures a feedback signal to produce a pulse-width signal to control described luminescence unit.
2. light source drive control device as claimed in claim 1, wherein, this feedback signal, this drive signal or this pulse-width signal are voltage signals.
3. light source drive control device as claimed in claim 1, wherein, this feedback control unit has a bleeder circuit, and it connects this power-supply unit electrically, to produce a reference voltage signal.
4. light source drive control device as claimed in claim 3, wherein, this bleeder circuit has one first resistor and one second resistor in series connects.
5. light source drive control device as claimed in claim 3, wherein, this feedback control unit has more a comparator circuit, and it connects this bleeder circuit and described luminescence unit electrically, and relatively this reference voltage signal and this feedback signal, to produce a comparison signal or a voltage signal.
6. light source drive control device as claimed in claim 5, wherein, this comparator circuit comprises an operational amplifier.
7. light source drive control device as claimed in claim 1, wherein, this feedback control circuit has more a filtering circuit or a low-pass filter, and it is connected in described luminescence unit electrically, and this feedback signal is carried out filtering.
8. light source drive control device as claimed in claim 7, wherein, this filtering circuit has one the 3rd resistor and a capacitor.
9. light source drive control device as claimed in claim 5, wherein, this feedback control unit has more a pulse-width modulation circuit or a control chip, and it connects this comparator circuit and described luminescence unit electrically, and this comparison signal is converted to this pulse-width signal.
10. light source drive control device as claimed in claim 9, wherein, this pulse-width modulation circuit has an operational amplifier and an oscillator, wherein, this oscillator produces an oscillator signal, and this operational amplifier relatively this oscillator signal and this comparison signal, to produce this pulse-width signal.
11. light source drive control device as claimed in claim 1, it more comprises a switch element, and it connects described luminescence unit and this feedback control unit respectively electrically.
12. light source drive control device as claimed in claim 11, it more comprises a temperature sense control unit, it connects this switch element electrically, and this temperature sense control unit senses one environment temperature is controlled a signal or a voltage signal to produce a sense, and controls described luminescence unit by this switch element.
13. light source drive control device as claimed in claim 12, wherein, this temperature sense control unit comprises a thermal resistor or a thermal coupler.
14. light source drive control device as claimed in claim 12, wherein, this switch element has one first switch module, a second switch assembly and one the 3rd switch module, this first switch module connects described luminescence unit and this second switch assembly respectively electrically, this second switch assembly connects this first switch module and the 3rd switch module respectively electrically, and the 3rd switch module connects this second switch assembly, this feedback control circuit and this temperature sense control unit respectively electrically.
15. light source drive control device as claimed in claim 14, wherein, this second switch units in series the 3rd switch element and be an AND circuit.
16. light source drive control device as claimed in claim 14, wherein, described switch module is respectively a transistor, a two-carrier junction transistor or a mos field effect transistor.
17. light source drive control device as claimed in claim 1, wherein, described luminescence unit is a light emitting diode.
18. a backlight module comprises:
One backboard has an accommodation space; And
One light source drive control device, be arranged in this accommodation space, and drive a plurality of luminescence units, this light source drive control device has a power-supply unit and a feedback control unit, wherein, this power-supply unit connects described luminescence unit electrically, and exports a drive signal to drive described luminescence unit, this feedback control unit connects between this power-supply unit and wantonly two luminescence units electrically, and captures a feedback signal to produce a pulse-width signal to control described luminescence unit.
19. backlight module as claimed in claim 18, it more comprises a diffuser plate.
20. a LCD, it comprises:
One display panels; And
One backlight module, be arranged on a side of this display panels, wherein, this backlight module has a light source drive control device, this light source drive control device drives a plurality of luminescence units, and have a power-supply unit and a feedback control unit, wherein, this power-supply unit connects described luminescence unit electrically, and export a drive signal to drive described luminescence unit, this feedback control unit connects between this power-supply unit and wantonly two luminescence units electrically, and captures a feedback signal to produce a pulse-width signal to control described luminescence unit.
21. LCD as claimed in claim 20, wherein, this backlight module more comprises a backboard, and it has an accommodation space for this light source drive device setting.
22. LCD as claimed in claim 20, wherein, this backlight module more comprises a diffuser plate, and described luminescence unit is launched an incidence surface that enters this display panels after a light spreads via this diffuser plate respectively.
CNA2007100884619A 2007-03-27 2007-03-27 LCD, backlight module and light source drive control device Pending CN101276074A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2007100884619A CN101276074A (en) 2007-03-27 2007-03-27 LCD, backlight module and light source drive control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2007100884619A CN101276074A (en) 2007-03-27 2007-03-27 LCD, backlight module and light source drive control device

Publications (1)

Publication Number Publication Date
CN101276074A true CN101276074A (en) 2008-10-01

Family

ID=39995658

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2007100884619A Pending CN101276074A (en) 2007-03-27 2007-03-27 LCD, backlight module and light source drive control device

Country Status (1)

Country Link
CN (1) CN101276074A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102625515A (en) * 2011-01-31 2012-08-01 中强光电股份有限公司 Light emitting diode drive device, method thereof and applied light source system thereof
CN103310720A (en) * 2012-03-09 2013-09-18 艾默生过程控制流量技术有限公司 Backlight control device and method, and display device
CN103377606A (en) * 2012-04-25 2013-10-30 联咏科技股份有限公司 Display panel temperature sensing device
TWI416990B (en) * 2009-10-23 2013-11-21 Innolux Corp Light source module, backlight module and control method of light source module
CN105099166A (en) * 2014-05-14 2015-11-25 成都国星通信有限公司 Method for improving power-on stability of multiplexing enabled pin and chip
CN108182916A (en) * 2018-01-02 2018-06-19 昆山龙腾光电有限公司 Driving circuit and driving method
CN113539150A (en) * 2021-06-09 2021-10-22 重庆两江联创电子有限公司 Backlight brightness control circuit and liquid crystal display screen detection equipment

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI416990B (en) * 2009-10-23 2013-11-21 Innolux Corp Light source module, backlight module and control method of light source module
CN102625515A (en) * 2011-01-31 2012-08-01 中强光电股份有限公司 Light emitting diode drive device, method thereof and applied light source system thereof
CN103310720A (en) * 2012-03-09 2013-09-18 艾默生过程控制流量技术有限公司 Backlight control device and method, and display device
CN103377606A (en) * 2012-04-25 2013-10-30 联咏科技股份有限公司 Display panel temperature sensing device
CN105099166A (en) * 2014-05-14 2015-11-25 成都国星通信有限公司 Method for improving power-on stability of multiplexing enabled pin and chip
CN108182916A (en) * 2018-01-02 2018-06-19 昆山龙腾光电有限公司 Driving circuit and driving method
CN113539150A (en) * 2021-06-09 2021-10-22 重庆两江联创电子有限公司 Backlight brightness control circuit and liquid crystal display screen detection equipment

Similar Documents

Publication Publication Date Title
CN101276074A (en) LCD, backlight module and light source drive control device
CN102467885B (en) LED-backlit driver
CN101511142B (en) Switch constant-current source circuit without feedback on load end
US20150156846A1 (en) Over-current protection circuit, led backlight driving circuit and liquid crystal device
US10152926B2 (en) Driving circuit for light emitting element, light emitting device using same, and display apparatus
KR20080042847A (en) A multiple-cell led arrangement, related cell and manufacturing process
CN103198809B (en) LED (Light Emitting Diode) backlight source and liquid-crystal display equipment
US20080231621A1 (en) Liquid crystal display apparatus, backlight module and light source driving device thereof
CN203052303U (en) Power-saving lighting device with human body induction module
CN103401209B (en) LED backlight short-circuit protection circuit
TW201125440A (en) Distributed architecture voltage controlled backlight driver
CN102074214A (en) Monolithic integrated LED (light emitting diode) backlight and LCD (liquid crystal display) power supply driving system
CN103280193A (en) Backlight driving circuit, liquid crystal display device and backlight driving method
WO2014187018A1 (en) Short circuit protection circuit and electronic device having same
CN102740567A (en) LED (light-emitting diode) backlight driving circuit, backlight module and liquid crystal display device
CN107770901A (en) Light emitting diode driving device and short-circuit protection method of driving device
CN100546420C (en) Light source driving circuit
CN102118904B (en) LED illuminating system and control method thereof
TWI420201B (en) Back-light apparatus
CN102917518A (en) Method for achieving LED (Light-emitted Diode) light bar current multiplication and corresponding drive circuit thereof
CN103150984B (en) The detection circuit of open circuit for LED array and use its LED driver equipment
CN201550332U (en) Constant current driving circuit of LED module
EP1983638A3 (en) Output current pumping circuit and remote controller using the same
KR101847323B1 (en) Single-string overpower protection device and light source driving circuit in display
CN201765805U (en) Current control circuit

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Open date: 20081001