PCF8562TT-2 NXP [NXP Semiconductors], PCF8562TT-2 Datasheet - Page 9

• Manufacturer Part Number: PCF8562TT-2
• Description: Universal LCD driver for low multiplex rates
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCF8562
Product data sheet
7.3.1 Electro-optical performance
Using
1
1
The advantage of these LCD drive modes is a reduction of the LCD full scale voltage V
as follows:
These compare with
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
Figure
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
⁄
⁄
2
2
on(RMS)
th(off)
•
•
on RMS
off RMS
bias is
bias is


1:3 multiplex (
1:4 multiplex (
Equation
and V
5. For a good contrast performance, the following rules should be followed:


and V


----------
V
V
3
3
21
Equation 1
th on
th(on)
th off

=

off(RMS)
=
All information provided in this document is subject to legal disclaimers.
3, the discrimination for an LCD drive mode of 1:3 multiplex with
1.732


are properties of the LCD liquid and can be provided by the module
1.528
1
1
th(off)
⁄
⁄
2
2
on(RMS)
bias):
bias):
V
are properties of the display driver and are affected by the selection
) and the other at 90 % relative transmission (at V
LCD
and the discrimination for an LCD drive mode of 1:4 multiplex with
to
Rev. 6 — 16 June 2011
.
LCD
Equation
V
V
=
and V
is sometimes referred as the LCD operating voltage.
LCD
LCD
3V
off RMS
=
=
off(RMS)

3) and the V

--------------------- -
6
4



3
V
are dependent on the LCD liquid used. The
when
Universal LCD driver for low multiplex rates
off RMS
3


1
=
LCD
⁄
3

2.309V
bias is used.
=
voltage.
2.449V
off RMS

off RMS



PCF8562
© NXP B.V. 2011. All rights reserved.
th(on)
), see
9 of 43
LCD
(4)
(5)