Abstract: A heater circuit (H) according to the invention comprises a stabilizing power supply (SPS) with a control input (CT) which receives a control signal (Cs) to control the value at which the heater voltage (Vh) has to be stabilized. A timing circuit (TC) generates the control signal (Cs) such that the heater voltage (Vh) has a nominal value (Vhn) in a normal operation phase, and such that the heater voltage (Vh) has a boost value (Vhb) higher than the nominal value (Vhn) during a boost period (Tb) of a start-up phase (Ts). The normal operation phase is defined as the phase during which the heater (HE) is sufficiently hot to enable display of a picture with good quality. The start-up phase (Ts) is the phase during which the display apparatus starts up and the heater (HE) warms up.

Abstract: 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%).