HT16C21
LCD Drive Mode Waveforms
When the LCD drive mode is selected as 1/4 duty and 1/3 bias, the waveform and LCD display is shown as
follows:
●
tLCD
LCD segment
LCD segment
VLCD
State1
VLCD
State1
(on)
VLCD- Vop/3
VLCD- Vop/3
(on)
COM0
COM0
VLCD- 2Vop/3
VLCD- 2Vop/3
VSS
VSS
VLCD
VLCD
State2
State2
(off)
(off)
VLCD- Vop/3
VLCD- Vop/3
COM1
COM1
VLCD- 2Vop/3
VLCD- 2Vop/3
VSS
VSS
VLCD
VLCD
VLCD- Vop/3
VLCD- Vop/3
COM2
COM2
VLCD- 2Vop/3
VLCD- 2Vop/3
VSS
VSS
VLCD
VLCD
VLCD- Vop/3
VLCD- Vop/3
COM3
COM3
VLCD- 2Vop/3
VLCD- 2Vop/3
VSS
VSS
VLCD
VLCD
VLCD- Vop/3
VLCD- Vop/3
SEG n
SEG n
VLCD- 2Vop/3
VLCD- 2Vop/3
VSS
VSS
VLCD
VLCD
VLCD- Vop/3
VLCD- Vop/3
SEG n+1
SEG n+1
VLCD- 2Vop/3
VLCD- 2Vop/3
VSS
VSS
VLCD
VLCD
VLCD- Vop/3
VLCD- Vop/3
SEG n+2
SEG n+2
VLCD- 2Vop/3
VLCD- 2Vop/3
VSS
VSS
VLCD
VLCD
VLCD- Vop/3
VLCD- Vop/3
SEG n+3
SEG n+3
VLCD- 2Vop/3
VLCD- 2Vop/3
VSS
VSS
Waveforms for 1/4 duty drive mode with 1/3 bias (VOP = VLCD-VSS
)
Note: tLCD = 1/fLCD
Rev. 1.00
11
November 22, 2011
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
