field-sequential color tv system

NOUN
32 LETTERS · STARTS WITH F

field-sequential color tv system is a valid 32-letter word worth 51 points in Scrabble and 58 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
F4I1E1L1D2-0S1E1Q10U1E1N1T1I1A1L1C3O1L1O1R1T1V4S1Y4S1T1E1M3
4 + 1 + 1 + 1 + 2 + 0 + 1 + 1 + 10 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 + 0 + 1 + 4 + 0 + 1 + 4 + 1 + 1 + 1 + 3 =51 PTS
DOUBLE WORD → 102TRIPLE WORD → 153
MEANING

What does field-sequential color tv system mean?