Panasonic TC-55AS530U - Manual (Page 29)

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Auto brightness (ECO)
Contrast Automatic Tracking System (C.A.T.S.) adjusts the screen brightness
and contrast according to the room’s ambient light conditions. This ECO
feature automatically dims the brightness of the screen when the room
lighting is lowered.
C.A.T.S. features a built-in delay when the lighting conditions change. The
adjustment happens gradually.
If you prefer a consistent brightness, disable C.A.T.S. by:
● Menu > Picture > scroll down to C.A.T.S. and turn it off.
Or
● Menu > Picture > Picture mode then select viewing mode such as
Custom.