PCF2119AU NXP [NXP Semiconductors], PCF2119AU Datasheet - Page 12

• Manufacturer Part Number: PCF2119AU
• Description: LCD controllers/drivers Single-chip LCD controller and driver
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
Table 6.
PCF2119X
Product data sheet
Multiplex
rate
1:18
1:9
1:2
Bias levels as a function of multiplex rate
Number of
bias levels
5
5
4
8.5.1 Electro-optical performance
The RMS on-state voltage (V
RMS off-state voltage (V
where the values of a are
and the values for n are
Discrimination (D) is the ratio of V
Suitable values for V
RMS voltage, at which a pixel will be switched on or off, determine the transmissibility of
the pixel.
For any given liquid, there are two threshold values defined. One point is at 10 % relative
transmission (at V
For a good contrast performance, the following rules should be followed:
V
V
D
V
V
on RMS
off RMS
on RMS
off RMS
a = 2 for
a = 3 for
n = 2 for 1:2 multiplex rate
n = 9 for 1:9 multiples rate
n = 18 for 1:18 multiplex rate.
=
(
(
(
(
---------------------- -
V
Bias voltages
V
V
V
V
V
1
LCD
LCD
LCD
off RMS
on RMS
)
)
)
)
(
≥
(
≤
=
=
1
1
V
V
⁄
⁄
V
V
4
5
high
V
low
3
-- - V
4
3
-- - V
4
2
-- - V
3
LCD
LCD
)
)
bias
bias
2
(
(
(
=
All information provided in this document is subject to legal disclaimers.
LCD
LCD
LCD
----------------------------- -
n
----------------------------- -
n
a
a
low
2
×
×
2
(
------------------------------------------- -
(
–
–
–
+
a
a 1
–
(
) and the other at 90% relative transmission (at V
on(RMS)
(
1
Rev. 7 — 15 November 2010
V
V
V
1
2a
+
2a
–
SS
SS
SS
+
+
1
off(RMS)
)
)
)
+
+
a
)
a
)
2
2
)
n
)
n
2
2
+
+
and V
on(RMS)
(
(
V
n 1
n 1
1
-- - V
2
1
-- - V
2
2
-- - V
3
) with
3
(
(
(
–
–
on(RMS)
LCD
LCD
LCD
off(RMS)
)
)
) for the LCD is calculated with
Equation
–
–
–
V
V
V
SS
SS
SS
to V
are dependant on the LCD liquid used. The
)
)
)
off(RMS)
4:
V
1
-- - V
2
1
-- - V
2
1
-- - V
3
4
(
(
(
LCD
LCD
LCD
and is determined from
–
–
–
V
V
V
SS
SS
SS
)
)
)
LCD controllers/drivers
V
1
-- - V
4
1
-- - V
4
1
-- - V
3
Equation 3
5
(
(
(
PCF2119x
LCD
LCD
LCD
high
© NXP B.V. 2010. All rights reserved.
), see
–
–
–
V
V
V
SS
SS
SS
Equation 5
)
)
)
and the
Figure
12 of 83
V
V
V
V
6
SS
SS
SS
3.
(3)
(4)
(5)
(6)
(7)