CN202939950U - Driving device of liquid crystal module backlight system - Google Patents
Driving device of liquid crystal module backlight system Download PDFInfo
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- CN202939950U CN202939950U CN 201220640967 CN201220640967U CN202939950U CN 202939950 U CN202939950 U CN 202939950U CN 201220640967 CN201220640967 CN 201220640967 CN 201220640967 U CN201220640967 U CN 201220640967U CN 202939950 U CN202939950 U CN 202939950U
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- backlit
- constant flow
- liquid crystal
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Abstract
The utility model relates to a liquid crystal module device. The technical problem to be solved in the utility model is to provide a driving device, for driving LED liquid crystal modules of different dimensions, of a liquid crystal module backlight system. The technical scheme adopted in the utility model can be summarized as follows: the driving device of the liquid crystal module backlight system comprises an LED backlight system module, an on-off control module, a power management module and a DC/DC voltage stabilization and LED backlight constant-current module; the on-off control module and the power management module are connected with an input end of the DC/DC voltage stabilization and LED backlight constant-current module; and an output end of the DC/DC voltage stabilization and LED backlight constant-current module is connected with an LED backlight constant-current module. The driving device of the liquid crystal module backlight system has the beneficial effects of being simple and portable, capable of driving LED liquid crystal module backlight systems of different dimensions and dynamically adjusting the working current of the backlight system and applicable to liquid crystal modules.
Description
Technical field
The utility model relates to a kind of liquid crystal module device, especially relates to the drive unit of a kind of liquid crystal module group backlight system.
Background technology
In liquid crystal module exploitation, production and maintenance process, all need the LED-backlit system is lighted debugging, whether work to detect LED-backlit, and then could carry out other relevant works.
At present, because the size of the LED-backlit system of liquid crystal module is different with model, system is also different to the demand of driving voltage and drive current, so the driving power state of the LED liquid crystal module of different size is more, use loaded down with trivial detailsly, be difficult to adapt to the development and production requirements of one's work.
Often need to change backlight illumination by regulating the LED-backlit working current in test module group backlight performance process.At present DC/DC boosts and all adopts external reference voltage or setting resistance to control the size of drive current with constant current control chip and DC/DC step-down with the constant current control chip.The constant current source that uses in research and development and production division and source of stable pressure is high because of its cost, use is inconvenient to limit its usable range, and can't be realized convenient adjustment and the control of electric current.
The back light system drive plate of most liquid crystal module uses the PWM (Pulse Width Modulation, pulse width modulation) of outside input to regulate back light system to realize the detection to back light system.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of drive unit of the liquid crystal module group backlight system that different size LED liquid crystal module is driven.
The technical scheme that its technical matters that solves the utility model adopts is: the drive unit of liquid crystal module group backlight system, comprise the LED-backlit system module, it is characterized in that, comprise break-make control module, power management module and DC/DC voltage stabilizing and LED-backlit constant flow module; Described break-make control module and power management module are connected with the input end of DC/DC voltage stabilizing with the LED-backlit constant flow module respectively; The DC/DC voltage stabilizing is connected with the LED-backlit constant flow module with the output terminal of LED-backlit constant flow module.
Further, also comprise LED-backlit working current adjustment module; The input end of described LED-backlit working current adjustment module is connected with power management module, and the output terminal of LED-backlit working current adjustment module is connected with the LED-backlit constant flow module with the DC/DC voltage stabilizing.
Preferably, DC/DC voltage stabilizing and LED-backlit constant flow module comprise that DC/DC boosts and the LED-backlit constant flow module.
Preferably, DC/DC voltage stabilizing and LED-backlit constant flow module comprise DC/DC step-down and LED-backlit constant flow module.
As the preferred version of such scheme, DC/DC voltage stabilizing and LED-backlit constant flow module comprise that DC/DC boosts and LED-backlit constant flow module and DC/DC step-down and LED-backlit constant flow module.
The beneficial effects of the utility model are: Simple portable, can the LED liquid crystal module group backlight system of various sizes be driven, and can dynamic adjustments back light system working current, be applicable in liquid crystal module.
Description of drawings
Fig. 1 is the utility model example structure unit block diagram;
Fig. 2 is the circuit structure diagram of the utility model embodiment PWM light modulation;
wherein, Vin is input voltage, Q1, Q2, Q3 and Q4 are metal-oxide-semiconductor, R15 and R23 are pull down resistor, R16 and R18 are current-limiting resistance, C11, C16, C12 and C17 tremble electric capacity for disappearing, SW1 and SW2 are single-pole double-throw switch (SPDT), U2 is linear voltage regulator, C6 and C7 are electric capacity, Vcc is the operating voltage of DC/DC voltage stabilizing and LED-backlit constant flow module, C4, C5, C8 and C9 are filter capacitor, L1 and L2 are inductor, D1 and D6 are schottky diode, R17, R19, R22, R20, R21, Rvset1, Rvset2, Rset1 and Rset2 are resistance, C1 and C2 are the filtering storage capacitor, GND is ground wire, VIN is the input end of U2, VOUT is the output terminal of U2.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
The drive unit of liquid crystal module group backlight of the present utility model system comprises the LED-backlit system module, it is characterized in that, comprises break-make control module, power management module and DC/DC voltage stabilizing and LED-backlit constant flow module; Described break-make control module and power management module are connected with the input end of DC/DC voltage stabilizing with the LED-backlit constant flow module respectively; The DC/DC voltage stabilizing is connected with the LED-backlit constant flow module with the output terminal of LED-backlit constant flow module.
In order to regulate easily the back light system working current, also comprise LED-backlit working current adjustment module; The input end of described LED-backlit working current adjustment module is connected with power management module, and the output terminal of LED-backlit working current adjustment module is connected with the LED-backlit constant flow module with the DC/DC voltage stabilizing.
Preferably, DC/DC voltage stabilizing and LED-backlit constant flow module comprise that DC/DC boosts and the LED-backlit constant flow module.
Preferably, DC/DC voltage stabilizing and LED-backlit constant flow module comprise DC/DC step-down and LED-backlit constant flow module.
For can be according to the size of LED loaded work piece voltage, select to boost accordingly or reduction voltage circuit, in technique scheme, DC/DC voltage stabilizing and LED-backlit constant flow module comprise that DC/DC boosts and LED-backlit constant flow module and DC/DC step-down and LED-backlit constant flow module.
Embodiment
As shown in Figure 1, in the present embodiment, choose DC/DC voltage stabilizing and LED-backlit constant flow module and comprise that DC/DC boosts and LED-backlit constant flow module and DC/DC step-down and LED-backlit constant flow module.The break-make control module is boosted with DC/DC and is connected with the LED-backlit constant flow module with the DC/DC step-down with the LED-backlit constant flow module, can select to boost work or step-down work according to the operating voltage of LED-backlit system module and the size of input voltage vin.Power management module boosts with DC/DC and is connected with LED-backlit constant flow module and LED-backlit working current adjustment module with LED-backlit constant flow module, DC/DC step-down, powers with LED-backlit constant flow module, DC/DC step-down and LED-backlit constant flow module and LED-backlit working current adjustment module for DC/DC boosts.The LED-backlit system module is connected with DC/DC and is connected with the LED-backlit constant flow module with LED-backlit constant flow module and DC/DC step-down, is boosted and LED-backlit constant flow module or DC/DC step-down and the work of LED-backlit constant flow module driving LED back light system module by DC/DC.LED-backlit working current adjustment module is connected with DC/DC and is connected with the LED-backlit constant flow module with LED-backlit constant flow module and DC/DC step-down, by changing the component parameter in LED-backlit working current adjustment module, can change DC/DC and boost and LED-backlit constant flow module or DC/DC step-down and the LED-backlit constant flow module driving working current to LED-backlit.
It is the circuit diagram of the utility model embodiment PWM light modulation as Fig. 2.
The break-make control module comprises metal-oxide-semiconductor Q3 and Q4, pull down resistor R15 and R23, and current-limiting resistance R16 and R18 disappear and tremble capacitor C 11, C16, C12 and C17 and single-pole double-throw switch (SPDT) SW1 and SW2.The grid of two metal-oxide-semiconductors is order double-pole double throw switch SW1 and SW2 respectively.The motionless termination current-limiting resistance R16 of single-pole double-throw switch (SPDT) SW1, a moved end ground connection, another moved end connects input voltage vin.The motionless termination current-limiting resistance R18 of single-pole double-throw switch (SPDT) SW2, an end ground connection of a moved end, another moved end connects input voltage vin.By controlling single-pole double-throw switch (SPDT) SW1 and SW2, two metal-oxide-semiconductor grid high-low levels are switched, realize break-make control function, can complete boosting and the step-down selection of whole system, metal-oxide-semiconductor Q3, Q4 can be PMOS.In other embodiment, above-mentioned break-make control module also can be comprised of other switching devices such as relays.
Power management module mainly is comprised of linear voltage regulator U2 and filter capacitor C4, C5, C8 and C9.Linear voltage regulator U2 is connected with filter capacitor C4, C5, C8 and C9, and its input end VIN is connected with input voltage vin, is fit to the operating voltage Vcc of DC/DC voltage stabilizing and LED-backlit constant flow module in its output terminal VOUT output.In other embodiment, power management module also can be other voltage conversion circuit and forms.
DC/DC boosts and comprises inductor L1 with the LED-backlit constant flow module, schottky diode D1, and metal-oxide-semiconductor Q1, resistance R 17 and R20, filtering energy storage capacitor C 1 and DC/DC boost and form with the constant current control chip.DC/DC boosts and controls metal-oxide-semiconductor Q1 connecting and disconnecting with the pwm signal of the constant current control chip certain dutycycle of output and frequency, and inductor L1, completes DC/DC and boosts with the input voltage vin stack by storing and releasing energy.Schottky diode D1 guarantees that energy offers the rear end load.Capacitor C 1 is completed filtering and burning voltage.
DC/DC step-down and LED-backlit constant flow module are boosted by inductor L2, schottky diode D6, metal-oxide-semiconductor Q2, resistance R 21, filtering energy storage capacitor C 2 and DC/DC and form with the constant current control chip.The pwm signal of DC/DC step-down and the constant current control chip certain dutycycle of output and frequency is controlled metal-oxide-semiconductor Q2 connecting and disconnecting, and inductor L1 completes the DC/DC step-down by storing and releasing energy.The passage that schottky diode D6 provides inductor to release energy.Capacitor C 1 is completed filtering and voltage stabilizing function.
LED-backlit working current adjustment module is comprised of resistance R 19, R22, Rvset1, Rvset2, Rset1 and Rset2.Resistance R vset1 and resistance R 19, resistance R vset2 and resistance R 22 be by dividing potential drop, is boost reference voltage Viset1, Viset2 with constant current control chip and DC/DC step-down and constant current control chip needs of DC/DC with the operating voltage Vcc dividing potential drop of DC/DC voltage stabilizing and LED-backlit constant flow module.Namely by regulating resistance Rvset1, Rvset1, Rset1, Rset2, can change LED load drive current size.
The LED-backlit system module is comprised of the LED light emitting diode.The LED-backlit system of different size module is different, and namely the quantity of its LED, kind and connection in series-parallel relation are different, therefore the driving arrangement voltage and current is required also different.
Claims (5)
1. the drive unit of liquid crystal module group backlight system, comprise the LED-backlit system module, it is characterized in that, comprises break-make control module, power management module and DC/DC voltage stabilizing and LED-backlit constant flow module; Described break-make control module and power management module are connected with the input end of DC/DC voltage stabilizing with the LED-backlit constant flow module respectively; The DC/DC voltage stabilizing is connected with the LED-backlit constant flow module with the output terminal of LED-backlit constant flow module.
2. the drive unit of liquid crystal module group backlight as claimed in claim 1 system, is characterized in that, also comprises LED-backlit working current adjustment module; The input end of described LED-backlit working current adjustment module is connected with power management module, and the output terminal of LED-backlit working current adjustment module is connected with the LED-backlit constant flow module with the DC/DC voltage stabilizing.
3. the drive unit of liquid crystal module group backlight as claimed in claim 1 or 2 system, is characterized in that, DC/DC voltage stabilizing and LED-backlit constant flow module comprise that DC/DC boosts and the LED-backlit constant flow module.
4. the drive unit of liquid crystal module group backlight as claimed in claim 1 or 2 system, is characterized in that, DC/DC voltage stabilizing and LED-backlit constant flow module comprise DC/DC step-down and LED-backlit constant flow module.
5. the drive unit of liquid crystal module group backlight as claimed in claim 1 or 2 system, is characterized in that, DC/DC voltage stabilizing and LED-backlit constant flow module comprise that DC/DC boosts and LED-backlit constant flow module and DC/DC step-down and LED-backlit constant flow module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220640967 CN202939950U (en) | 2012-11-29 | 2012-11-29 | Driving device of liquid crystal module backlight system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220640967 CN202939950U (en) | 2012-11-29 | 2012-11-29 | Driving device of liquid crystal module backlight system |
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| CN202939950U true CN202939950U (en) | 2013-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220640967 Expired - Fee Related CN202939950U (en) | 2012-11-29 | 2012-11-29 | Driving device of liquid crystal module backlight system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014187004A1 (en) * | 2013-05-20 | 2014-11-27 | 深圳市华星光电技术有限公司 | Led backlight driving circuit, backlight module, and liquid crystal display apparatus |
| CN104332140A (en) * | 2014-10-28 | 2015-02-04 | 深圳创维－Rgb电子有限公司 | Backlight driving system for regional dimming and regional dimming method |
| US9237609B2 (en) | 2013-05-20 | 2016-01-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit, backlight module, and LCD device |
| CN107342058A (en) * | 2017-08-30 | 2017-11-10 | 创维液晶器件(深圳)有限公司 | Liquid crystal display die set brightness adjusting method, test board, system and equipment |
-
2012
- 2012-11-29 CN CN 201220640967 patent/CN202939950U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014187004A1 (en) * | 2013-05-20 | 2014-11-27 | 深圳市华星光电技术有限公司 | Led backlight driving circuit, backlight module, and liquid crystal display apparatus |
| CN104685971A (en) * | 2013-05-20 | 2015-06-03 | 深圳市华星光电技术有限公司 | LED backlight driving circuit, backlight module, and liquid crystal display apparatus |
| US9237609B2 (en) | 2013-05-20 | 2016-01-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit, backlight module, and LCD device |
| CN104332140A (en) * | 2014-10-28 | 2015-02-04 | 深圳创维－Rgb电子有限公司 | Backlight driving system for regional dimming and regional dimming method |
| CN107342058A (en) * | 2017-08-30 | 2017-11-10 | 创维液晶器件(深圳)有限公司 | Liquid crystal display die set brightness adjusting method, test board, system and equipment |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130515 Termination date: 20211129 |