field-sequential color television system

NOUN
40 LETTERS · STARTS WITH F

field-sequential color television system is a valid 40-letter word worth 59 points in Scrabble and 68 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
F4I1E1L1D2-0S1E1Q10U1E1N1T1I1A1L1C3O1L1O1R1T1E1L1E1V4I1S1I1O1N1S1Y4S1T1E1M3
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 + 0 + 1 + 4 + 1 + 1 + 1 + 3 =59 PTS
DOUBLE WORD → 118TRIPLE WORD → 177
MEANING

What does field-sequential color television system mean?