yon bon ekspozisyon ki gen koulè plen dwe adapte ak diferan tanperati, move tan diferan, epi yo ka itilize nòmalman nan plizyè okazyon tankou yon etap dirije konsè dirije ekspozisyon ak ki enpèmeyab deyò dirije miray videyo. li tou gen yon bon efè pou byen lwen ak tou pre limyè. espesyalman nan konsè gwo, efè espesyal limyè yo ta dwe eksepsyonèl, men pafwa n ap jwenn klète dirije a. diferan, ki sa ki rezon ki fè yo pou enkonsistans nan klète nan plen koulè ekspozisyon dirije? ki baze sou ane eksperyans nan, 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, pi bon konsistans la, but the lower the yield and the higher the inventory will be. Se poutèt sa, 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, tankou 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%.
an plis, 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. Se konsa, si ou achte yon ekran ak klète konsistan, tanpri kontakte founisè sèvis ou a oswa manifakti pou rezoud pwoblèm lan.
3. ekran an montre melanje ak materyèl nan pwosesis pwodiksyon an, ak diferan lo nan matris dot yo te itilize.
ki jan yo rezoud diferans nan koulè nan dirije ekran ekspozisyon elektwonik?
premye metòd la se chanje aktyèl la ap koule tankou dlo nan dirije la. jeneralman, kontinyèl k ap travay aktyèl la nan tib la dirije se sou 20 ma. eksepte pou saturation nan wouj la te dirije, limyè a nan lòt leds se fondamantalman pwopòsyonèl ak aktyèl la ap koule tankou dlo nan.
dezyèm metòd la se pou itilize inèsi vizyèl nan je imen an ak batman modulasyon lajè reyalize kontwòl nivo gri, sa vle di. detanzantan chanje lajè batman kè limyè a (sik devwa). osi lontan ke sik la nan repete ekleraj se kout ase (sa vle di, frekans rafrechisman an wo ase), je imen an pa ka santi piksèl fliyoresan souke. paske batman lajè batman pi apwopriye pou kontwòl dijital, prèske tout ekran dirije ekspozisyon elektwonik itilize batman lajè batman pou kontwole nivo gri nan kontni ekspozisyon jodi a ki baze sou òdinatè ak dirije.