Samsung T260 Manual page 46

Ref : I nver t er - Di m m i ng
Ther e ar e t hr ee m et hods . The
am ount of t he cur r ent t hat ent er s t he l am p. The
and of f t he l am p i n a cons t ant cycl e. The
bot h t wo m et hods .
Cur r ent Cont r ol ( Anal og Di m m i ng)
- Di m m i ng i s pos s i bl e wi t h gi vi ng l i t t l e af f ect t o t he panel .
- Requi r es a m i ni m um cur r ent s o t hat no par t i al ON appear s at t he
m i ni m um br i ght nes s .
- Low di m m i ng r at i o ( about 2: 1)
- Ef f i ci ency i s l ow at t he di m m i ng s t at e becaus e t he i nver t er i s
opt i m i zed t o t he m axi m um br i ght nes s .
PW M Cont r ol ( Bur s t Di m m i ng)
- Di m m i ng i s done by t ur ni ng on and of f t he l am p at t he f r equency of
about 300 Hz t o 1 kHz.
- Becaus e t hi s m et hod t ur ns on and of f a l ar ge vol um e of cur r ent i n a
cons t ant cycl e, t he gr ound of t he panel power par t becom es uns t abl e and
noi s e i s gener at ed, caus i ng wat er f al l s .
- Becaus e t he l am p ON s t at e al ways oper at es at t he m axi m um br i ght nes s ,
ef f i ci ency i s hi gh and t he par t i al ON pr obl em at t he m i ni m um br i ght nes s
i s s ol ved.
- Hi gh di m m i ng r at i o ( about 5: 1)
Cur r ent Cont r ol m et hod cont r ol s t he
Com pl ex
PW M m et hod t ur n on
m et hods com bi nes