CN101179891A - LED back light source brightness control device - Google Patents
LED back light source brightness control device Download PDFInfo
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- CN101179891A CN101179891A CNA2007101766840A CN200710176684A CN101179891A CN 101179891 A CN101179891 A CN 101179891A CN A2007101766840 A CNA2007101766840 A CN A2007101766840A CN 200710176684 A CN200710176684 A CN 200710176684A CN 101179891 A CN101179891 A CN 101179891A
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- backlight
- backlight drive
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Abstract
The invention relates to a brightness control device of LED backlight source, which includes: a control device which is used for carrying out an analysis and calculation according to the collected LCD TV video signals and generating control signals, and a backlight driving device which is connected with the control device and is used for regulating the brightness of the LED backlight source according to corresponding driving current generated by the control signal. By setting the control device and the backlight driving device, the invention causes the backlight source to form an interval working mode, thereby not only realizing the target of regulating the brightness of the backlight, but also reducing the energy consumption and heat of the backlight source and prolonging the service life. The invention has the advantages of a simple structure, a low cost and being easy to be realized; besides, the energy consumption is saved under the precondition that the display quality is guaranteed.
Description
Technical field
The present invention relates to a kind of device of controlling backlight, especially a kind of LED-backlit source brightness control device.
Background technology
At present, LCD (Liquid Crystal Display is called for short LCD) mostly adopts cathode fluorescent tube (Cold Cathode Fluorescent Lamp is called for short CCFL) as backlight.The CCFL technology is comparative maturity, but has a lot of shortcomings, and less as the colour gamut that CCFL can reach, promptly the color expression range of TV is less; CCFL is next luminous with mercury gas (mercury vapor) in addition, does not meet following environmental protection requirement.
And light-emitting diode (Light Emitting Diode, be called for short LED) is as a kind of new type light source of energy-saving and environmental protection, compares with CCFL to have lot of advantages.With the backlight of LED, can make the LCD TV obtain higher contrast, brightness and color reducibility as the LCD TV.And LED is a kind of semiconductor solid-state optical source, do not contain any noxious substance.LED just progressively replaces traditional CCFL light source as the environmental protection light source.
Existing LED-backlit source is simple direct replaced C CFL backlight on original circuit just, still adopts luminous mode of operation continuously.This pattern makes the energy consumption of backlight and caloric value all very big, also needs to dispose corresponding heat abstractor.In fact, a lot of occasions (when showing blank screen as needs) can be closed backlight fully, and when display frame was relatively darker, back light source brightness also can reduce.
Summary of the invention
The purpose of this invention is to provide a kind of LED-backlit source brightness control device, effectively solve the existing continuous luminous mode of operation in LED-backlit source and cause energy consumption and the big technological deficiency of caloric value.
Draw together:
Control device is used for generating control signal according to the vision signal of the LCD TV of being gathered;
Backlight drive device links to each other with described control device, is used for regulating according to described control signal the brightness in LED-backlit source.
Described control device comprises: signal acquisition module, the vision signal that is used to gather described LCD TV; Signal processing module links to each other with described signal acquisition module, is used for described vision signal is carried out analyzing and processing, and result is exported; The signal controlling module links to each other with described signal processing module, is used for generating control signal according to described result, and to described backlight drive device output.
Described backlight drive device comprises the backlight drive circuit that several are connected in parallel, and each backlight drive circuit comprises: LED lamp group is used to provide light source; Triode, its base stage is connected with described signal controlling module, and its collector and emitter is connected in series with described LED lamp group, is used for controlling the unlatching of described LED lamp group or closing according to described control signal.Described LED lamp group comprises several LED coupled in series lamps.
The invention provides a kind of LED-backlit source brightness control device, at prior art LED mode of operation cause that energy consumption is big, caloric value is big and needs dispose defectives such as extra heat dissipation device, by control device and backlight drive device are set, make backlight form a kind of interruption working method, not only reach the purpose of control back light source brightness, and reduced the energy consumption of backlight, prolonged useful life, further can also reduce corresponding heat abstractor, reduce cost.The present invention is simple in structure, cost is low, be easy to realization, under the prerequisite that guarantees display quality, saves energy consumption.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is a LED-backlit source brightness control device principle schematic of the present invention;
Fig. 2 is a backlight drive device circuit diagram of the present invention.
Embodiment
Fig. 1 is a LED-backlit source brightness control device principle schematic of the present invention, Fig. 2 is a backlight drive device circuit diagram of the present invention, as shown in Figure 1 and Figure 2, LED-backlit source brightness control device of the present invention comprises control device 1 and backlight drive device 2, and wherein control device 1 is used for the video signal generating control signal according to the LCD TV of being gathered; Backlight drive device 2 links to each other with control device 1, is used for regulating according to control signal the brightness in LED-backlit source.
Particularly, control device 1 comprises signal acquisition module 11, signal processing module 12 and signal controlling module 13.Signal acquisition module 11 is used to gather the vision signal of LCD TV, and signal processing module 12 is connected with signal acquisition module 11, is used for the vision signal that collects is analyzed and handled, and result is exported to signal controlling module 13; Signal controlling module 13 is connected with signal processing module 12, and the analysis processing result of received signal processing module 12 also produces control signal according to this result, and export to backlight drive device 2.
Wherein, backlight drive device 2 comprises the backlight drive circuit that several are connected in parallel, each backlight drive circuit comprises LED lamp group 21 and triode 22, each LED lamp group 21 is composed in series by a plurality of LED lamps, be used for providing light source to liquid crystal display device, each LED lamp group 21 is connected in series with triode 22, forms a backlight drive circuit, and a plurality of backlight drive circuits compose in parallel backlight drive device 2.Wherein the base stage of triode 22 links to each other with signal controlling module 13, collector and emitter is serially connected in the backlight drive circuit, triode 22 is controlled conducting or shutoff by the control signal of signal controlling module 13 outputs, thereby reaches the purpose of the opening and closing of control LED lamp.
In the present embodiment, signal acquisition module 11 is gathered the vision signal of the whole screen picture of LCD TV with certain frequency, send signal processing module 12 then to, area size according to the LED-backlit source, 12 pairs of whole screen pictures of signal processing module carry out subregion (generally can be divided into tens zones), then each regional vision signal is extracted the luminance parameter of this area pixel, calculate the drive signal magnitude of voltage of this area pixel according to the luminance parameter of this area pixel, handle according to the size of its magnitude of voltage again.When screen picture was brighter, the luminance parameter of area pixel was bigger, and the magnitude of voltage of its drive signal is also bigger, at this moment just needed the LED lamp brighter, and the drive current that promptly flows through LED lamp group 21 is bigger.Signal processing module 12 calculates the driving current value of the LED lamp group 21 corresponding with this magnitude of voltage according to the magnitude of voltage that obtains, the current value ratio of the drive current by this result of calculation and last one constantly being flow through LED lamp group 21, can draw a ratio, then this ratio be outputed to signal controlling module 13.Signal controlling module 13 produces this ratio the control signal of respective waveforms as duty ratio, as when ratio is 80,13 generations of signal controlling module duty ratio is 80% control signal, the high level that is control signal accounts for 80%, low level accounts for 20%, this control signal that signal controlling module 13 will produce is exported to triode 22 by output port, triode 22 is finished conducting or is turn-offed action according to control signal, make and produce the corresponding driving electric current in the backlight drive circuit, and make LED lamp group 21 open or turn-off with the duty ratio of setting, by the unlatching and the turn-off time of adjusting LED lamp group 21, thus the brightness of control backlight.
In technical solution of the present invention, backlight drive circuit also can adopt the version of LED lamp group triode in parallel, and a plurality of backlight drive circuits compose in parallel backlight drive device again.But when LED lamp group was closed, the mode of LED lamp group triode in parallel made electric energy all consume on triode, causes the energy consumption of integral LED backlight bigger.
In the present embodiment, if the drive current that LED lamp group needs is too big, and the control signal of signal controlling module 13 output relatively a little less than, then can adopt two or more triodes to form compound transistors, by compound transistor the drive current of LED lamp group is regulated.
From technique scheme as can be seen, the present invention changes into the interruption open mode owing to adjusted the mode of operation in LED-backlit source from continuing open mode, has reduced the operating time of LED lamp, reduce the energy consumption in LED-backlit source on the one hand, prolonged the useful life in LED-backlit source on the other hand.And, because the response speed in LED-backlit source is very fast, in the blink that it is closed, heat can be come out as early as possible, can reduce corresponding heat abstractor thus, reduced cost.
The present invention is simple in structure, cost is low, be easy to realization, under the prerequisite that guarantees display quality, saves energy consumption.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that previous embodiment is put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of embodiment of the invention technical scheme.
Claims (4)
1. a LED-backlit source brightness control device is characterized in that, comprising:
Control device is used for generating control signal according to the vision signal of the LCD TV of being gathered;
Backlight drive device links to each other with described control device, is used for regulating according to described control signal the brightness in LED-backlit source.
2. LED-backlit source brightness control device according to claim 1 is characterized in that, described control device comprises:
Signal acquisition module, the vision signal that is used to gather described LCD TV;
Signal processing module links to each other with described signal acquisition module, is used for described vision signal is carried out analyzing and processing, and result is exported;
The signal controlling module links to each other with described signal processing module, is used for generating control signal according to described result, and to described backlight drive device output.
3. LED-backlit source brightness control device according to claim 1 is characterized in that described backlight drive device comprises the backlight drive circuit that several are connected in parallel, and each backlight drive circuit comprises:
LED lamp group is used to provide light source;
Triode, its base stage is connected with described signal controlling module, and its collector and emitter is connected in series with described LED lamp group, is used for controlling the unlatching of described LED lamp group or closing according to described control signal.
4. LED-backlit source brightness control device according to claim 3 is characterized in that, described LED lamp group comprises several LED coupled in series lamps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101766840A CN101179891B (en) | 2007-11-01 | 2007-11-01 | LED back light source brightness control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101766840A CN101179891B (en) | 2007-11-01 | 2007-11-01 | LED back light source brightness control device |
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| Publication Number | Publication Date |
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| CN101179891A true CN101179891A (en) | 2008-05-14 |
| CN101179891B CN101179891B (en) | 2011-05-04 |
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| CN2007101766840A Active CN101179891B (en) | 2007-11-01 | 2007-11-01 | LED back light source brightness control device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102348084A (en) * | 2010-07-29 | 2012-02-08 | Tcl集团股份有限公司 | Television system and method for reducing power consumption of the television without signal |
| WO2013174119A1 (en) * | 2012-05-25 | 2013-11-28 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN103886840A (en) * | 2014-03-05 | 2014-06-25 | 美的集团股份有限公司 | Display screen brightness control device, air conditioner and method for controlling display screen brightness |
| CN105405412A (en) * | 2015-12-23 | 2016-03-16 | 深圳Tcl新技术有限公司 | Backlight driving control method and system |
| CN106128391A (en) * | 2016-08-29 | 2016-11-16 | 合肥惠科金扬科技有限公司 | A kind of LCD backlight module with brightness impression regulation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7324080B1 (en) * | 2004-12-03 | 2008-01-29 | Sysview Technology, Inc. | Backlighting in liquid crystal flat panel display |
-
2007
- 2007-11-01 CN CN2007101766840A patent/CN101179891B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102348084A (en) * | 2010-07-29 | 2012-02-08 | Tcl集团股份有限公司 | Television system and method for reducing power consumption of the television without signal |
| WO2013174119A1 (en) * | 2012-05-25 | 2013-11-28 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN103886840A (en) * | 2014-03-05 | 2014-06-25 | 美的集团股份有限公司 | Display screen brightness control device, air conditioner and method for controlling display screen brightness |
| CN103886840B (en) * | 2014-03-05 | 2016-08-31 | 美的集团股份有限公司 | Brightness of display screen controls device, air-conditioning and luminance control method for display screen |
| CN105405412A (en) * | 2015-12-23 | 2016-03-16 | 深圳Tcl新技术有限公司 | Backlight driving control method and system |
| WO2017107387A1 (en) * | 2015-12-23 | 2017-06-29 | 深圳Tcl新技术有限公司 | Backlight driver control method and system |
| US10613379B2 (en) | 2015-12-23 | 2020-04-07 | Shenzhen Tcl New Technology Ltd. | Backlight driving control method and system |
| CN106128391A (en) * | 2016-08-29 | 2016-11-16 | 合肥惠科金扬科技有限公司 | A kind of LCD backlight module with brightness impression regulation |
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| Publication number | Publication date |
|---|---|
| CN101179891B (en) | 2011-05-04 |
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