Application Note
AN1763
8
MOTOROLA
Figure 5. LCD 1/2 Duty and 1/2 Bias Timing Diagram,
V
LCD1
= V
LCD2
= V
DD
–V
LCD
/2, V
LCD3
= V
DD
–V
LCD
Figure 6. Waveform Components for Calculating
ON and OFF RMS Voltages
BP0
FPX
(10)
BP1–FPX
OFF
BP0–FPX
ON
VDD
VLCD1, VLDC2
VLCD3
+VLCD
+VLCD/2
0
–VLCD/2
–VLCD
+VLCD
+VLCD/2
0
–VLCD/2
–VLCD
FRAME
BP1
VDD
VLCD1, VLDC2
VLCD3
VDD
VLCD1, VLDC2
VLCD3
f(t) =
f(t) =
(BP0–FPX)
2
ON
VLCD
2
VLCD
2
/4
0
FRAME
(BP1–FPX)
2
OFF
VLCD
2
VLCD
2
/4
0
f
2
(t) =
f
2
(t) =