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NXP Semiconductors
PCA85132
LCD driver for low multiplex rates
n = 3 for 1:3 multiplex drive mode
n = 4 for 1:4 multiplex drive mode
The RMS off-state voltage (V off(RMS) ) for the LCD is calculated with Equation 3 :
a 2 – 2a + n
n ? ? 1 + a ?
V off ? RMS ? =
V LCD
------------------------------
2
(3)
Discrimination is the ratio of V on(RMS) to V off(RMS) and is determined from Equation 4 :
V on ? RMS ?
a + 2a + n
a – 2a + n
D = ----------------------- =
V off ? RMS ?
2
---------------------------
2
(4)
Using Equation 4 , the discrimination for an LCD drive mode of 1:3 multiplex with
1 ?
2
bias is
3 = 1.732 and the discrimination for an LCD drive mode of 1:4 multiplex with
bias is ---------- = 1.528 .
1 ?
2
21
3
The advantage of these LCD drive modes is a reduction of the LCD full scale voltage V LCD
as follows:
? 1:3 multiplex ( 1 ? 2 bias): V LCD =
6 ? V off ? RMS ? = 2.449V off ? RMS ?
? 1:4 multiplex ( 1 ? 2 bias): V LCD = ? ---------------------- ? = 2.309V off ? RMS ?
4 ? 3
3
These compare with V LCD = 3V off ? RMS ? when 1 ? 3 bias is used.
V LCD is sometimes referred as the LCD operating voltage.
7.3.3.1
Electro-optical performance
Suitable values for V on(RMS) and V off(RMS) are dependent on the LCD liquid used. The
RMS voltages, at which a pixel is 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 th(off) ) and the other at 90 % relative transmission (at V th(on) ), see
Figure 6 . For a good contrast performance, the following rules should be followed:
V on ? RMS ? ? V th ? on ?
V off ? RMS ? ? V th ? off ?
(5)
(6)
V on(RMS) and V off(RMS) are properties of the display driver and are affected by the selection
of a (see Equation 2 ), n (see Equation 4 ), and the V LCD voltage.
V th(off) and V th(on) are properties of the LCD liquid and can be provided by the module
manufacturer. V th(off) is sometimes named V th . V th(on) is sometimes named saturation
voltage V sat .
PCA85132
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 11 July 2013
? NXP B.V. 2013. All rights reserved.
14 of 62
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