Samsung T260

Ref : I nver t er - Di mmi ng
Ther e ar e t hr ee met hods . The Cur r ent Cont r ol met hod cont r ol s t he
amount of t he cur r ent t hat ent er s t he l amp. The PWM met hod t ur n on
and of f t he l amp i n a cons t ant cycl e. The Compl ex met hods combi nes
bot h t wo met hods .
Cur r ent Cont r ol ( Anal og Di mmi ng)
- Di mmi 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 mi ni mum cur r ent s o t hat no par t i al ON appear s at t he
mi ni mum br i ght nes s .
-
Low di mmi ng r at i o ( about 2: 1)
-
Ef f i ci ency i s l ow at t he di mmi ng s t at e becaus e t he i nver t er i s
opt i mi zed t o t he maxi mum br i ght nes s .
PWM Cont r ol ( Bur s t Di mmi ng)
- Di mmi ng i s done by t ur ni ng on and of f t he l amp at t he f r equency of
about 300 Hz t o 1 kHz.
-
Becaus e t hi s met hod t ur ns on and of f a l ar ge vol ume of cur r ent i n a
cons t ant cycl e, t he gr ound of t he panel power par t becomes 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 amp ON s t at e al ways oper at es at t he maxi mum 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 mi ni mum br i ght nes s
i s s ol ved.
-
Hi gh di mmi ng r at i o ( about 5: 1)
Compl ex Cont r ol
- Suppr es s es wat er f al l s by us i ng anal og met hod at t he ear l y s t age of
di mmi ng.
- I ncr eas es t he di mmi ng r at i o by us i ng t he PWM met hod at t he l at e s t age
of di mmi ng.