field-sequential color television

NOUN
33 LETTERS · STARTS WITH F

field-sequential color television is a valid 33-letter word worth 48 points in Scrabble and 57 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
F4I1E1L1D2-0S1E1Q10U1E1N1T1I1A1L1C3O1L1O1R1T1E1L1E1V4I1S1I1O1N1
4 + 1 + 1 + 1 + 2 + 0 + 1 + 1 + 10 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 1 + 4 + 1 + 1 + 1 + 1 + 1 =48 PTS
DOUBLE WORD → 96TRIPLE WORD → 144
MEANING

What does field-sequential color television mean?