pcf8536 NXP Semiconductors, pcf8536 Datasheet - Page 28

• Manufacturer Part Number: pcf8536
• Description: Universal Lcd Driver For Low Multiplex Rates Including A 6 Channel Pwm Generator
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF8536
Product data sheet
8.4.1 Electro-optical performance
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.
D
V
V
Fig 14. Electro-optical characteristic: relative transmission curve of the liquid
on(RMS)
th(off)
on RMS
off RMS
=


---------------------- -
V
V
and V
off RMS
14. For a good contrast performance, the following rules should be followed:
on RMS


and V




V
V
Equation 4
th on
th(on)
th off




off(RMS)
=
All information provided in this document is subject to legal disclaimers.


are properties of the LCD liquid and can be provided by the module
th(off)
Universal LCD low multiplex driver with 6 channel PWM generator
a
-------------------------- -
a
2
2
on(RMS)
+
–
are properties of the display driver and are affected by the selection
) and the other at 90 % relative transmission (at V
100 %
Rev. 1 — 6 October 2011
to
90 %
10 %
2a
2a
LCD
Equation
+
+
and V
n
is sometimes referred to as the LCD operating voltage.
n
SEGMENT
OFF
off(RMS)
6) and the V
V
th(off)
are dependent on the LCD liquid used. The
SEGMENT
GREY
LCD
V
th(on)
voltage.
SEGMENT
ON
013aaa494
V
RMS
[V]
PCF8536
© NXP B.V. 2011. All rights reserved.
th(on)
), see
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