labs krāsains led displejs jāpielāgo dažādām temperatūrām, dažādi laika apstākļi, and can be used normally in various occasions such a stage led concert led display and waterproof outdoor led video wall. it also has a good effect for far and near light. especially in large concerts, special effects light should be exceptional, but sometimes we will find the brightness of led. different, what is the reason for the inconsistency of the brightness of full-color led display? based on years of experience, the author summarizes the following three factors which can lead to the inconsistency of the brightness of full-color led display.
1. luminescent elements
the luminous elements of full-color led display screen, namely led light-emitting tubes, are inevitably different in brightness during the production process. but the countermeasure adopted by the manufacturers of led electronic display screen is to classify after production. the smaller the brightness difference between the adjacent two gears, jo labāka konsistence, but the lower the yield and the higher the inventory will be. tāpēc, each manufacturer controls the brightness difference between two adjacent gears at 20%.
2. driving elements
the driving elements of full-color led display are usually constant-current driving chips, piemēram, mbl5026. these chips include 16 constant-current drive outputs, which can be set by resistance. the output errors of the same chip are controlled within 3%, while the output errors of different chips are controlled within 6%. it is normal that 25% brightness errors occur among the pixels of the full-color led display. if the led light emitting tube is not a full-color led display of the same level and type, the brightness errors will rise to more than 40%.
papildus, it is worth noting that the inconsistent brightness of full-color led display screen is the fundamental reason for the formation of flower screen. it can not be corrected by post-proofreading equipment, as long as it is achieved by the production and manufacturing process of led display manufacturers. tāpēc, ja jūs pērkat ekrānu ar nevienmērīgu spilgtumu, Lūdzu, sazinieties ar pakalpojumu sniedzēju vai ražotāju, lai atrisinātu problēmu.
3. ražošanas procesā displeja ekrāns tiek sajaukts ar materiālu, un tiek izmantotas dažādas punktveida matricas partijas.
kā atrisināt krāsu atšķirību led elektroniskais displejs?
pirmā metode ir mainīt strāvu, kas plūst caur led. vispārīgi, vadītās caurules nepārtrauktā darba strāva ir aptuveni 20 mā. izņemot sarkanā led piesātinājumu, citu gaismas diožu spilgtums principā ir proporcionāls caur to plūstošajai strāvai.
the second method is to use the visual inertia of the human eye and pulse width modulation to achieve gray level control, t.i.. periodiski mainot gaismas impulsa platumu (cikls). as long as the cycle of repeated lighting is short enough (t.i., atsvaidzināšanas frekvence ir pietiekami augsta), the human eye can not feel the fluorescent pixels shaking. jo impulsu platuma modulācija ir vairāk piemērota digitālai vadībai, almost all led electronic display screens use pulse width modulation to control gray level in today’s computer-based and led display content.