Chongqing part of LED display, LED dot matrix block usually go again when I was in factory testing machine, can ensure the consistent, the colour of the shipment if no spectral color separation machine, or the parameters of the testing machine can set unreasonable, can't ensure the colour of the shipment is consistency. B: there are differences between the color of a part of the circuit c: abnormal display mix the material in the production process, with the different batches of lattice.
Question 2, LED display screen have off color is the quality problem
LED display screen have off color, it must be the quality! The colour of the LED is mainly for the quality control of factory when purchasing LED chips, LED chips procurement relationship is largely wavelength, when when I was purchasing is within + / - 1.5 nm, foreign writing parameter is + / - 2.5 nm, many manufacturers purchase light wavelength in + / - 5 nm, some even save costs, procurement of plus or minus 10 nm LED chips, is not the same wavelength, has a great influence on the whole screen color consistency, can appear what we call the color difference, namely Mosaic! But each manufacturer to purchase chips could not control under a numeric value, allowing a small amount of deviation, homebred deviation in the range of 1.5 nm is allowed to buy back we'll mix light!
Question 3, LED display module have off color how to distinguish
LED display when doing the module can be separate, if you know the module of the process, know that starting from which link control.
On the first link should be to control the wavelength of the LED, generally not more than three red LED wavelengths nanometers, Vf value not more than 0.3 V, green LED not more than 2 nm, Vf value not more than 0.2 V, as well as blue and green (this is for outdoor products). In the choose and buy of suite generally won't appear too many questions, is the mask will affect the appearance of the module, the note (for indoor-outdoor products). And must be mixed evenly mixed lamp, under the ion fan at least twice (outdoor, Indoor 0when purchasing, reclaiming supplier request clear.
