DYNAMIC BLACK LEVEL COMPENSATION CIRCUITS FOR TV

摘要

A circuit for correcting a dynamic black level which can correction the black level regardless of an APL(Average Picture Level) is disclosed. The correction circuit comprises: a black level correction controller(10); an white peak level controller(20) being the input connected to resistors(R10,R11), a condenser(C4) and a collector of a transistor(Q3); a bright and contrast controller(30) having a main power; a buffer(41) having resistors(R1-R4), a condenser(C1) and a transistor(Q1) connected to a brightness signal input(Y-in); and a field effect transistor(FET2) having a diode(D1) being a source connected to an emitter of the transistor(Q3).