CN103035205A - Active type dynamic light emitting diode (LED) backlight module applied to large screen liquid crystal display (LCD) - Google Patents
Active type dynamic light emitting diode (LED) backlight module applied to large screen liquid crystal display (LCD) Download PDFInfo
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- CN103035205A CN103035205A CN 201110303319 CN201110303319A CN103035205A CN 103035205 A CN103035205 A CN 103035205A CN 201110303319 CN201110303319 CN 201110303319 CN 201110303319 A CN201110303319 A CN 201110303319A CN 103035205 A CN103035205 A CN 103035205A
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Abstract
The invention relates to a liquid crystal display (LCD) backlight module, in particular to an active type dynamic light emitting diode (LED) backlight module applied to a large screen LCD. The entire backlight of a backlight module in a direct type structure is divided into a plurality of small areas, and the brightness of each backlight area can be adjusted according to image contents. The dynamic backlight module displays not an even light source with constant brightness, but an active type dynamic backlight source which can be simultaneously adjusted along with the image contents on the LCD. The LCD backlight module can effectively solve the problem that an LCD panel leaks light in a dark room, substantially improves dynamic contrast ratio of images, can display fine gray scale differences and a bright stereoscopic vision whether in a bright environment or in a dark room, and has an obvious electricity conservation effect.
Description
Technical field
The present invention relates to the backlight module of a kind of LCM, relate in particular to a kind of active dynamic LED backlight module for the giant-screen LCD display.
Background technology
Fast development along with the LCD display technology, the large-scale application of LED-backlit module, so that the response speed of LCD TV and image quality make great progress, LED-backlit is progressively replacing cold-cathode fluorescence lamp (CCFL), and will become inevitable trend.
Up to now, the LED-backlit module that industry is used all is the passive type static mode of operation, LED lights after the start, backlight module only is light source, the uniform source of light of constant luminance is provided to LCDs passively, and the brightness of image, contrast and image quality are all by LCDs control, and the quality that image contrast, image quality GTG level distribute is determined by LCD display fully, no matter presentation content how, backlight institute consumed power is changeless.
The maximum difference of dynamic LED backlight module and the passive scheme of traditional static formula is, the LED of backlight module takes the straight-down negative structure, matrix form distributes, and backlight control circuit reaches brightness according to the brightness of shown picture signal with whether lighting of dynamical fashion optimization ground driving LED particle.
The average power consumption of active dynamic LED backlight module will be lower than traditional C CFL backlight module, can effectively reduce the LED power consumption more than 30～50% (view is decided as content), reach the effect of power and energy saving, also can effectively reduce simultaneously the generation of LED heat, help to reduce or cancel extra radiator accessories, reduce material and the manufacturing cost of whole backlight module; Power-dissipation-reduced also will further improve LED life of product and fiduciary level.In addition, rely on active dynamic driver circuit design can further promote image picture quality, the most outstanding is can the improving picture contrast, and from 1,000: 1 breaks through to 10,000: more than 1, satisfy the demand of high-definition liquid crystal colour TV image quality and high dynamic range video.
Summary of the invention
Key concept of the present invention is with the whole some little zones that are divided into backlight of the backlight module of straight-down negative structure, the brightness of each backlight area is along with picture material is carried out brightness regulation, what the dynamic backlight module represented is not the uniform source of light of a constant luminance, and provides an active dynamic backlight of regulating with picture material.This pattern can effectively solve liquid crystal panel darkroom light leak problem, significantly promotes the image dynamic contrast, no matter can both demonstrate careful grayscale difference and distincter stereoscopic vision in bright light environments or darkroom, has more very significantly power savings.
The present invention is comprised of backlight module 1, driving circuit 2, power circuit 3, control circuit 4, control circuit 4 is connected with the LVDS circuit of display screen, from the LVDS signal, extract the single frames signal, and calculate brightness corresponding to each LED zone, then the led driver of respective regions is controlled, thereby synchronously adjusted the luminous of LED backlight with display image.
Description of drawings
Fig. 1: Contrast on effect synoptic diagram
Fig. 2: LED distribution schematic diagram backlight
Fig. 3: circuit block diagram
1---backlight module;
2---driving circuit;
3---power circuit;
4---control circuit.
Fig. 4: actual effect synoptic diagram
Embodiment
Dynamic direct-light type LED backlight design proposal:
Whole LED-backlit plate face is divided into 11 row, 32 row totally 352 zones, and each zone is made of the 0.06W White LED of 4 3528 encapsulation, and whole plate is totally 1408 LEDs, and the selection colour temperature is above at 10,000K, the uniform white light LEDs of brightness.Employing is exclusively used in the ultra-thin power supply of 200W that the LED-backlit TV uses as the power supply of backlight module, utilize TMS320C28342 (300MHz) DSP of TI as the master control IC of control circuit, from the LVDS signal of LCD master control borad, extract the single-frame images signal, calculate the brightness corresponding to the image in 352 zones, then the led driver of respective regions is controlled, thus dynamically to LED-backlit each regional brightness adjust.
Claims (7)
1. active dynamic LED backlight module that is used for the giant-screen LCD display.It is characterized in that: whole module is comprised of backlight module, driving circuit, power circuit, control circuit.LED in the backlight module takes straight-down negative matrix distribution structure, lights by the picture material synchronous dynamic of control circuit and driving circuit and LCD display.
2. adopt white light LEDs as light source according to the described backlight module of claim 1.It is characterized in that: the colour temperature of white light LEDs is more than 10,000K, and brightness is even.
3. formed by numerous white light LEDs that are the matrix arrangement according to the described backlight module of claim 1.It is characterized in that: the quantity of LED and arrangement mode determine according to the specification of display screen and display effect, and its quantity can be from hundreds of grains to hundreds thousand of grains, even can be identical with the resolution of display screen.
4. can increase substantially the contrast of LCD display according to the described backlight module of claim 1.It is characterized in that: the picture material synchronous dynamic of the LED in the module and LCD display is lighted, can rise to the contrast of LCD display from≤2000 〉=10000; When keeping maximum brightness identical, can reduce the power consumption of backlight module more than 30%.
5. provide control signal according to control circuit claimed in claim 1 for the driving circuit of lighting LED.It is characterized in that: control circuit is connected with the LVDS circuit of LCD display, from the LVDS signal, extract the single frames signal, and calculate brightness of image corresponding to each LED zone, then the led driver of respective regions is controlled, thereby synchronously, dynamically controlled the height that whether lighting of each regional LED reaches brightness with picture signal.
6. adopt the straight-down negative structure according to the white light LEDs in the described backlight module of claim 1.It is characterized in that: the size of LED-backlit plate is corresponding with the size of display screen, has enough large area size, can effectively reduce the generation of LED heat, help to reduce or cancel extra radiator accessories, reduce material cost and the manufacturing cost of Integral back optical module.
7. has good radiating condition according to the white light LEDs substrate in the described backlight module of claim 5.It is characterized in that: the white light LEDs that straight-down negative is matrix distribution has enough large planar dimension, therefore possessed good radiating condition, for increasing LED power, raising backlight illumination are laid a good foundation, so that LCD display also can normally be used under the high light environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110303319 CN103035205A (en) | 2011-10-09 | 2011-10-09 | Active type dynamic light emitting diode (LED) backlight module applied to large screen liquid crystal display (LCD) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201110303319 CN103035205A (en) | 2011-10-09 | 2011-10-09 | Active type dynamic light emitting diode (LED) backlight module applied to large screen liquid crystal display (LCD) |
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| CN103035205A true CN103035205A (en) | 2013-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110303319 Pending CN103035205A (en) | 2011-10-09 | 2011-10-09 | Active type dynamic light emitting diode (LED) backlight module applied to large screen liquid crystal display (LCD) |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104461432A (en) * | 2014-12-19 | 2015-03-25 | 南京奥拓电子科技有限公司 | Method for increasing synchronous display section of LED display screen |
| CN106128372A (en) * | 2016-09-14 | 2016-11-16 | 广州创维平面显示科技有限公司 | The control method of a kind of direct-light-type backlight, control system and LCD TV |
| CN107705759A (en) * | 2017-07-13 | 2018-02-16 | 深圳吉迪思电子科技有限公司 | A kind of drive system and driving method of dynamic adjustment backlight |
| CN109239979A (en) * | 2018-11-23 | 2019-01-18 | 深圳市国显科技有限公司 | A kind of Mini LED direct-type backlight LCM liquid crystal display die set and brightness control method |
| CN110390911A (en) * | 2018-04-19 | 2019-10-29 | 中兴通讯股份有限公司 | The display backlight brightness control method and electronic equipment of a kind of electronic equipment |
| CN111526343A (en) * | 2019-02-01 | 2020-08-11 | 中国电影器材有限责任公司 | Digital film projection method and system |
| WO2022047667A1 (en) * | 2020-09-02 | 2022-03-10 | 祝君芬 | Lcd and led hybrid display screen and lcd and led hybrid screen clock |
-
2011
- 2011-10-09 CN CN 201110303319 patent/CN103035205A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104461432A (en) * | 2014-12-19 | 2015-03-25 | 南京奥拓电子科技有限公司 | Method for increasing synchronous display section of LED display screen |
| CN104461432B (en) * | 2014-12-19 | 2017-09-15 | 南京奥拓电子科技有限公司 | It is a kind of to increase the interval method of LED display simultaneous display |
| CN106128372A (en) * | 2016-09-14 | 2016-11-16 | 广州创维平面显示科技有限公司 | The control method of a kind of direct-light-type backlight, control system and LCD TV |
| CN107705759A (en) * | 2017-07-13 | 2018-02-16 | 深圳吉迪思电子科技有限公司 | A kind of drive system and driving method of dynamic adjustment backlight |
| CN110390911A (en) * | 2018-04-19 | 2019-10-29 | 中兴通讯股份有限公司 | The display backlight brightness control method and electronic equipment of a kind of electronic equipment |
| CN109239979A (en) * | 2018-11-23 | 2019-01-18 | 深圳市国显科技有限公司 | A kind of Mini LED direct-type backlight LCM liquid crystal display die set and brightness control method |
| CN111526343A (en) * | 2019-02-01 | 2020-08-11 | 中国电影器材有限责任公司 | Digital film projection method and system |
| CN111526343B (en) * | 2019-02-01 | 2022-03-01 | 中国电影器材有限责任公司 | Digital film projection method and system |
| WO2022047667A1 (en) * | 2020-09-02 | 2022-03-10 | 祝君芬 | Lcd and led hybrid display screen and lcd and led hybrid screen clock |
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