Picture signal processor for performing both large area and small area contrast reduction, and picture display apparatus incorporating such a picture signal processor

摘要

A picture signal processor providing a contrast reduced picture signal, which includes a first contrast reduction device (MUL-R1, D5, CA1) receiving a picture signal (R-in) for providing a first contrast reduced picture signal (R), the first contrast reduction device only reduces the contrast of the picture signal (R-in) when the picture signal (R-in) exceeds a given first threshold (95%) for relatively large areas, while the picture signal processor further includes a second contrast reduction device (MUL-R2, D8, CA2), which is coupled to the first contrast reduction device (MUL-R1, D5, CA1) and which provides the contrast reduced picture signal by immediately reducing the contrast of a too bright part of the first contrast reduced picture signal (R) as soon and as long as an instantaneous amplitude of the first contrast-reduced picture signal (R) exceeds a given second threshold (100%).