PCA9620H NXP [NXP Semiconductors], PCA9620H Datasheet - Page 22

• Manufacturer Part Number: PCA9620H
• Description: Universal LCD driver for low multiplex rates
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCA9620
Product data sheet
7.4.1.1 Electro-optical performance
Discrimination is the ratio of V
It should be noted that 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
of a, n (see
V
manufacturer.
It is important to match the module properties to those of the driver in order to achieve
optimum performance.
V
--------------------- -
V
V
V
V
Fig 14. Electro-optical characteristic: relative transmission curve of the liquid
on(RMS)
low
off RMS
off RMS
on RMS
off RMS
on RMS
(
(
(
(
(
and V
)
)
)
)
)
and V
≥
≤
=
=
high
V
V
Equation 1
V
high
low
LCD
(
------------------------------------------- -
(
are properties of the LCD liquid and can be provided by the module
off(RMS)
a
a 1
All information provided in this document is subject to legal disclaimers.
+
–
----------------------------- -
n
a
low
1
×
2
)
)
–
) and the other at 90 % relative transmission (at V
on(RMS)
(
2
2
1
Rev. 1 — 9 December 2010
are properties of the display driver and are affected by the selection
2a
+
+
100 %
to
+
90 %
10 %
(
(
LCD
+
n 1
n 1
a
Equation
)
–
n
–
2
and V
is sometimes referred as the LCD operating voltage.
on(RMS)
)
)
SEGMENT
OFF
off(RMS)
3) and the V
to V
V
low
off(RMS)
are dependant on the LCD liquid used. The
SEGMENT
Universal LCD driver for low multiplex rates
GREY
LCD
and is determined from
V
high
voltage.
SEGMENT
ON
001aam358
V
RMS
[V]
high
PCA9620
© NXP B.V. 2010. All rights reserved.
Equation
), see
Figure
3:
22 of 71
14.
(2)
(3)
(4)
(5)