CN101937654A - LED backlight source device with brightness adaptive function and driving method thereof - Google Patents
LED backlight source device with brightness adaptive function and driving method thereof Download PDFInfo
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- CN101937654A CN101937654A CN 201010293144 CN201010293144A CN101937654A CN 101937654 A CN101937654 A CN 101937654A CN 201010293144 CN201010293144 CN 201010293144 CN 201010293144 A CN201010293144 A CN 201010293144A CN 101937654 A CN101937654 A CN 101937654A
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Abstract
The invention relates to an LED backlight source device with a brightness adaptive function. The LED backlight source device comprises a video signal input unit, an LED backlight source drive control board and an LED backlight source light bar, wherein the video signal input unit comprises a video decoding chip and a corresponding peripheral circuit, and is used for decoding various input video signals, receiving input information sent by a user through remote control or keying, and then outputting the video signals to the LED backlight source drive control board; and the LED backlight source drive control board comprises an FPGA control module and an LED backlight source driver module, and the FPGA control module is used for counting the video signals output by the video signal input unit, and sending a control signal to the LED backlight source driver module which drives the LED backlight source light bar according to the acquired control signal to perform adaptive adjustment on the brightness of the LED backlight source.
Description
Technical field
The present invention relates to the backlight of LCD technical field, be specifically related to a kind of LED-backlit source apparatus and driving method thereof with the brightness adaptation function.
Background technology
The LCD display technique need realize Presentation Function by backlight as a kind of non-self luminous display technique.Along with the continuous development of lcd technology, the LCD particularly application of colour liquid crystal display device is also constantly being widened.Spurred by the market of LCD, the backlight industry also presents a scene of prosperity.The LED-backlit source has great researching value and meaning as a kind of backlight with development potentiality.At present, what the LED-backlit source TV of selling on the market all adopted basically is side-light type white light LEDs backlight, and what the lighting mode in LED-backlit source adopted simultaneously is the lighting mode of Chang Liang.This lighting mode makes the energy consumption of backlight and thermal value all very big, has increased system power dissipation to a certain extent.
Summary of the invention
The continuous luminous mode of operation in LED-backlit source that the present invention is directed to prior art causes the higher defective of system power dissipation, and the LED-backlit source apparatus and the driving method thereof of the lower band brightness adaptation function of a kind of system power dissipation is provided.
For achieving the above object, the invention provides a kind of LED-backlit source apparatus with the brightness adaptation function, it comprises video input signals unit, LED-backlit source drive controlling plate, reaches LED-backlit source lamp bar, described vision signal input block comprises video decoding chip and correspondent peripheral circuit, this unit be used for decoding various inputs vision signal and receive the input information that the user sends by remote control or button, outputting video signal is given LED-backlit source drive controlling plate then; Described LED-backlit source drive controlling plate comprises FPGA control module and LED-backlit source driver module, the FPGA control module is used for adding up the vision signal of vision signal input block output, and transmit control signal to LED-backlit source driver module, LED-backlit source driver module comes driving LED backlight lamp bar according to the control signal that obtains, and carries out the self-adaptation of LED-backlit source brightness and regulates.
For achieving the above object, the invention provides a kind of driving method of the LED-backlit source apparatus with the brightness adaptation function, it comprises:
1) user can send input information by remote control or button and give the vision signal input block;
2) vision signal of the various inputs of described video input signals unit decodes and receive the input information that the user sends by remote control or button, outputting video signal is given LED-backlit source drive controlling plate then;
3) after LED-backlit source drive controlling plate receives vision signal, the vision signal of the FPGA control module statistics vision signal input block output in the drive controlling plate of LED-backlit source, add up all video input signals and obtain vision signal mean value, and send vision signal mean value to LED-backlit source driver module; And
4) drive controlling buttress in LED-backlit source comes driving LED backlight lamp bar according to vision signal mean value and user's selection respective algorithms, carries out the self-adaptation of back light source brightness and regulates.
The invention provides a kind ofly, cause the big defective of system power dissipation,, can not only reach the purpose of control back light source brightness, and reduced the system power dissipation of backlight by the dutycycle of width modulation (PWM) signal is set at prior art LED mode of operation.The brightness of backlight is carried out dynamic adjustments according to input signal among the present invention, and it is low that for example the brightness that can regulate backlight is hanged down in received image signal brightness, if received image signal brightness can be regulated the brightness height of backlight.Because the system power dissipation of LCD TV is mainly determined by the power consumption of backlight, so can reduce system power dissipation by the brightness of dynamic adjusting backlight.
Description of drawings
Fig. 1 is the structural representation of a kind of LED-backlit source apparatus with the brightness adaptation function according to the invention.
Embodiment
As shown in Figure 1, a kind of LED-backlit source apparatus with the brightness adaptation function according to the invention comprises LED-backlit source lamp bar 1, vision signal input block 2, LED-backlit source drive controlling plate 3.
Vision signal input block 2 is made up of video decoding chip 21 and correspondent peripheral circuit.This unit be used for decoding various inputs vision signal and receive the input information that the user sends by remote control or button, outputting video signal and some control signal corresponding are given LED-backlit source drive controlling plate 3 then.
LED-backlit source drive controlling plate 3 comprises FPGA control module 31 (field programmable gate array control module) and LED-backlit source driver module 32.Described FPGA control module 31 is made of FPGA and related circuit.Described LED-backlit source driver module 32 is made up of chip for driving and correspondent peripheral circuit.The FPGA control module is used for adding up the vision signal of vision signal input block 2 outputs, and transmits control signal to LED-backlit source driver module, and LED-backlit source driver module comes driving LED backlight lamp bar 1 according to control signal corresponding.
The concrete implementation step of the driving method of this device is as follows:
1) user can send input information by remote control or button and give vision signal input block 2.
2) vision signal of the various inputs of described video input signals unit 2 decodings and receive the input information that the user sends by remote control or button, outputting video signal is to LED-backlit source drive controlling plate 3 then.
3) after LED-backlit source drive controlling plate 3 receives vision signal, the vision signal of FPGA control module 31 statistics vision signal input blocks 2 outputs of LED-backlit source drive controlling plate 3, add up all video input signals and obtain vision signal mean value, and send vision signal mean value to LED-backlit source driver module 32.For example: the liquid crystal display of 1920*1080, each pixel is made up of three sub-pixels of RGB, and the data of 1920*1080*3 sub-pixel are added up and average, and the mean value of trying to achieve is 128.
4) drive controlling buttress in LED-backlit source comes driving LED backlight lamp bar according to vision signal mean value and user's selection respective algorithms, carries out the self-adaptation of back light source brightness and regulates.
Wherein, alternative algorithm has the adjusting of pulse-width signal frequency and the adjusting of pulse-width signal dutycycle.The adjusting of pulse-width signal frequency is that frequency is the quantity of the fixing pulse-width signal of 60*256*N (N is a natural number) and dutycycle in the statistical unit time, for example the frequency of pulse-width signal is 153.6K (N=10 this moment), dutycycle is 50%, suppose that the statistical value of trying to achieve is 128, generating 128*60*N frequency so in the unit interval is 153.6K, dutycycle is 50% pulse-width signal, can simply be expressed as with formula: the statistical value * 60*N that tries to achieve.The adjusting of pulse-width signal dutycycle is to generate the different pulse-width signal of dutycycle according to statistical value, the frequency that is to say pulse-width signal is constant, the just dutycycle of pulse-width signal that changes, concrete dutycycle can simply be formulated as: the statistical value of trying to achieve/256.
Claims (3)
1. LED-backlit source apparatus with the brightness adaptation function, it is characterized in that: comprise video input signals unit, LED-backlit source drive controlling plate, reach LED-backlit source lamp bar, described vision signal input block comprises video decoding chip and correspondent peripheral circuit, this unit be used for decoding various inputs vision signal and receive the input information that the user sends by remote control or button, outputting video signal is given LED-backlit source drive controlling plate then; Described LED-backlit source drive controlling plate comprises FPGA control module and LED-backlit source driver module, the FPGA control module is used for adding up the vision signal of vision signal input block output, and transmit control signal to LED-backlit source driver module, LED-backlit source driver module comes driving LED backlight lamp bar according to the control signal that obtains, and carries out the self-adaptation of LED-backlit source brightness and regulates.
2. the driving method of the LED-backlit source apparatus of a band brightness adaptation function as claimed in claim 1 is characterized in that:
1) user can send input information by remote control or button and give the vision signal input block;
2) vision signal of the various inputs of described video input signals unit decodes and receive the input information that the user sends by remote control or button, outputting video signal is given LED-backlit source drive controlling plate then;
3) after LED-backlit source drive controlling plate receives vision signal, the vision signal of the FPGA control module statistics vision signal input block output in the drive controlling plate of LED-backlit source, add up all video input signals and obtain vision signal mean value, and send vision signal mean value to LED-backlit source driver module; And
4) drive controlling buttress in LED-backlit source comes driving LED backlight lamp bar according to vision signal mean value and user's selection respective algorithms, carries out the self-adaptation of back light source brightness and regulates.
3. the driving method of the LED-backlit source apparatus of band brightness adaptation function as claimed in claim 2, it is characterized in that: described algorithm is the adjusting of pulse-width signal frequency or the adjusting of pulse-width signal dutycycle, wherein the adjusting of pulse-width signal frequency is that frequency is the quantity of the fixing pulse-width signal of 60*256*N and dutycycle in the statistical unit time, and wherein N is a natural number; The adjusting of pulse-width signal dutycycle is to generate the different pulse-width signal of dutycycle according to statistical value, is formulated as: the statistical value of trying to achieve/256.
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| CN 201010293144 CN101937654A (en) | 2010-09-27 | 2010-09-27 | LED backlight source device with brightness adaptive function and driving method thereof |
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| CN 201010293144 CN101937654A (en) | 2010-09-27 | 2010-09-27 | LED backlight source device with brightness adaptive function and driving method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606363A (en) * | 2013-12-04 | 2014-02-26 | 中航华东光电有限公司 | LCD type helmet display driving circuit based on FPGA |
| CN103778893A (en) * | 2014-02-07 | 2014-05-07 | 北京京东方视讯科技有限公司 | Backlight control method, backlight control device and display device |
| CN108510957A (en) * | 2018-05-18 | 2018-09-07 | 江西华兴信息产业有限公司 | A kind of energy saving LCD screen and luminance regulating method based on synchronous LED back light technology |
| CN108761904A (en) * | 2018-05-04 | 2018-11-06 | 苏州达方电子有限公司 | Back lighting device |
| WO2020118832A1 (en) * | 2018-12-13 | 2020-06-18 | 惠科股份有限公司 | Backlight circuit of display device, backlight module and display device |
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| US20090115757A1 (en) * | 2007-09-17 | 2009-05-07 | Magnachip Semiconductor, Ltd. | Low-power image display device and method |
| US20090189842A1 (en) * | 2008-01-24 | 2009-07-30 | Industrial Technology Research Institute | Backlight control apparatus |
| CN101697272A (en) * | 2009-10-27 | 2010-04-21 | 彩虹集团公司 | Device and method for correcting white balance of liquid crystal display equipment |
| CN101840686A (en) * | 2010-04-28 | 2010-09-22 | 上海大学 | Method and system for driving red, green and blue LED array dynamic backlights of liquid crystal display television |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20090115757A1 (en) * | 2007-09-17 | 2009-05-07 | Magnachip Semiconductor, Ltd. | Low-power image display device and method |
| US20090189842A1 (en) * | 2008-01-24 | 2009-07-30 | Industrial Technology Research Institute | Backlight control apparatus |
| CN101697272A (en) * | 2009-10-27 | 2010-04-21 | 彩虹集团公司 | Device and method for correcting white balance of liquid crystal display equipment |
| CN101840686A (en) * | 2010-04-28 | 2010-09-22 | 上海大学 | Method and system for driving red, green and blue LED array dynamic backlights of liquid crystal display television |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606363A (en) * | 2013-12-04 | 2014-02-26 | 中航华东光电有限公司 | LCD type helmet display driving circuit based on FPGA |
| CN103778893A (en) * | 2014-02-07 | 2014-05-07 | 北京京东方视讯科技有限公司 | Backlight control method, backlight control device and display device |
| US9837026B2 (en) | 2014-02-07 | 2017-12-05 | Boe Technology Group Co., Ltd. | Backlight control method, backlight control device and display apparatus employing a system on chip and a field-programmable gate array |
| CN108761904A (en) * | 2018-05-04 | 2018-11-06 | 苏州达方电子有限公司 | Back lighting device |
| CN108761904B (en) * | 2018-05-04 | 2019-12-03 | 苏州达方电子有限公司 | Back lighting device |
| CN108510957A (en) * | 2018-05-18 | 2018-09-07 | 江西华兴信息产业有限公司 | A kind of energy saving LCD screen and luminance regulating method based on synchronous LED back light technology |
| WO2020118832A1 (en) * | 2018-12-13 | 2020-06-18 | 惠科股份有限公司 | Backlight circuit of display device, backlight module and display device |
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Application publication date: 20110105 |