PCF8576CT/S480/1,1 NXP Semiconductors, PCF8576CT/S480/1,1 Datasheet - Page 12

• Manufacturer Part Number: PCF8576CT/S480/1,1
• Description: LCD Drivers Universal LCD Driver Low Multiplex Rates
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF8576C
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 (see
V
manufacturer. V
voltage V
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
8. For a good contrast performance, the following rules should be followed:


and V


Equation
sat
----------
V
V
3
.
3
21
th on
th(on)
th off

=

off(RMS)
=
All information provided in this document is subject to legal disclaimers.
th(off)
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)
⁄
⁄
1), n (see
2
2
on(RMS)
bias):
bias):
is sometimes just named V
V
are properties of the display driver and are affected by the selection
) and the other at 90 % relative transmission (at V
Rev. 11 — 30 March 2012
LCD
and the discrimination for an LCD drive mode of 1:4 multiplex with
.
LCD
V
V
=
and V
is sometimes referred as the LCD operating voltage.
LCD
LCD
Equation
3V
off RMS
=
=
off(RMS)


--------------------- -
6
4
3), and the V



3
V
are dependent on the LCD liquid used. The
when
Universal LCD driver for low multiplex rates
off RMS
3


1
=
th
⁄
3
. V

2.309V
bias is used.
=
LCD
th(on)
2.449V
voltage.
is sometimes named saturation
off RMS

off RMS


PCF8576C

© NXP B.V. 2012. All rights reserved.
th(on)
), see
12 of 61
LCD
(4)
(5)