White LED carry light
White LED carry light on white LED's back technical analysis-LED carry light and CCFL on technical analysis-LED's back carry on the back bare contrast
LED is a LightEmittingDiode(give out light diode) abbreviation, it is admixed semi-conductor material to make into very thinly by the several, the 1 F takes the electronics of having the surfeit, another then lack "empty cave" that electronics but formation take positive electricity, the electric current passes while working, >electronics and empty the cave combine mutually, surplus of energy the form of ray radiation then is released.LED carry the light light knothole shape and size on LED's back because LCD shows shape and size of plank light are different but each difference.LED carry light light on LED's back the plank basically is a rectangular or grow form of.It has a side department to give out light and the bottom give out light two kinds of basic structure.The structure that the side department gives out light mainly useds for long the carrying on the back of form light light plank(the general length more than 200% widths);But the bottom give out light structure to mainly used for length and width to mutually and about carry on the back a light light plank.When giving out light diode to order is bright, the ray shoots to go into transparent organic glass and make whole give out light noodles can see a glow-in-the-dark, this is called a side radiation should.The organic glass coping makes into tiny bead grain-like in shape, can make the whole ray that give out light noodles more even.The coping of organic glass has the 1 F the ivory transparent plastics film, can make emanative light softer.Carry on the back a light light plank two flanks is used silvery hide light the tape seal.Each LED gives out light unit row to contain two diodes for establishing, some rows constitute LED array.(see to carry on the back the light light knothole length but settle)
Give out light diode to contain a great deal of advantage compared with the existing CCFL technique.LED is a kind of light source of flat surface, the most basic LED's giving out light unit is a side to grow 3~5 millimeters of exact squares, the most easy combination together becomes the noodles light source of decided area, if is a carrying on the back of LCD screen light source, the assistance optical module needed can make it very in brief, the screen is bright the degree even is more outstanding.And LED carry light on LED's back there is better color area, color's expressing dint is stronger than the cold cathode fluorescent lamp carries on the back only, can be good to make up a function to the LCD technique that shows color amount shortage.LED carry the color area of light source on LED's back currently the scope even exceeds AdobeRGB and NTSC of the tallest grade color standard, can make LCD the display owns an extremely outstanding color performance.(and NTSC the specification compare and adopt LED carry bare LCD the display color area scope on LED's back can attain its 105%, but CCFT carry bare LCD on CCFT's back display color area biggest only NTSC 78%)Secondly is LED, the usage is the low voltage with 6~24 Vs, the design of power supply mold piece is also very simple, this kind of adoption LED carry CCFT(cold cathode fluorescence tube) that the LCD screen ratio of light source usually uses on LED's back type the LCD screen province give or get an electric shock 48%, don't contain in the meantime to healthy body, heavy metals mercury with harmful environment.
Take the LibrettoU100 of Toshiba as an example, it is on 7.2 inch LCD screens and adopted the independent control organization of 32 LEDs to carry out to carry on the back to shine on only system, can be fresh clear but clearly show image and writing, the achievement consumes to only have a 1.3 Ws, while the equal size LCD screen need of the CCFT cold cathode fluorescence take care of an achievement to consume above in the 2.5 Ws.The display of LED and LCD display compares and higherly break frequency to make LED had in the video frequency the better function performance-LED shows to hold of single chemical element reaction the speed is LCD 1000 times that of LCD screen, just can also shine on to see under the strong light a mistake not, and adapt to 40 ℃ below zero low temperatures.In addition to the achievement consumes low, environmental protection, LED still has one big advantage, that is the service life as long as 100,000 hours, even if use for 10 hours in a row every day, can also use last 27 yearses in a row.
However, LED also exists some more serious inborn blemishes and most make the industry suffered to should be giving out light of LED perplexedly an efficiency problem among them.Conduct and actions carry on the back the LED spare part of light source with the white only type mostly, but white light LED the spare part give out light an efficiency while starting not high, cause the screen bright degree widespreadly low.For example in the current LED technique, in spite of the manufacturer of screen is who, LED bright degrees of the module are all each not same.The CCFT cold cathode fluorescent lamp gives out light an efficiency to attain a 50~100 lms currently|W(flowing is clear|tile), but white light LED spare part at just start give out light an efficiency just for the 20 lms|the W was even much lower, this problem made the color been partial to move, inconformity of the color pure degree and quality were inferior of really"white", this destine LED while starting and wasn't suitable for is LCD carrying on the back of display light source.For getting rid of this problem, LED the manufacturers the chip"cent area" or resolve into the area piece that has to look like color and bright degree.This kind of processing contains certain help, but still exists to still keep being partial to move in the shortage, bright degree and color.Although afterwards the manufacturer developed color to correct electric circuit again, can rectify this problem in the certain degree,the even sex problem still keeps existing.Lucky of BE, the technique progress of that realm very quick, white only LED give out light an efficiency to raise 60% ranges to promote by every year, so far, white light the LED giving out light of spare part efficiency break a 50 lms|W, start attaining practical turn level.And the industry hope by 2007 and raise the white light giving out light of LED efficiency to the 75 lms|W high level, and latest of color correct system can also control color and the deviation on the bright degree at reasonable of inside the scope.Among them, the most representative color's correcting system is Lighthouse the M4 of the company system, it allows to hold each pixel(bright degree and color) in the plank to carry on a control alone to each one, can ensure to acquire white of pure and unadulterated and attain a better color balance|color control effect, of each pixel color and the deviation on the bright degree is controled in not more than 1% scopes inside.Compare under, the great majority only uses ratings or cent area piece LED LED screen in, generally exist 30% deviations.
