PCF8545ATTSLASHA datasheet(23/72 Pages) NXP

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PCF8545

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Product data sheet

Rev. 1 — 13 November 2013

23 of 72

NXP Semiconductors

PCF8545

Universal LCD driver for multiplex rates up to 1:8

(5)

VLCD is sometimes referred to as the LCD operating voltage.

8.4.1 Electro-optical performance

Suitable values for Von(RMS) and Voff(RMS) are dependent on the LCD liquid used. The

RMS voltage, at which a pixel gets 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 Vth(off)) and the other at 90 % relative transmission (at Vth(on)), see

Figure 13. For a good contrast performance, the following rules should be followed:

(6)

(7)

Von(RMS) and Voff(RMS) are properties of the display driver and are affected by the selection

of a, n (see Equation 3 to Equation 5) and the VLCD voltage.

Vth(off) and Vth(on) are properties of the LCD liquid and can be provided by the module

manufacturer. Vth(off) is sometimes named Vth. Vth(on) is sometimes named saturation

voltage Vsat.

It is important to match the module properties to those of the driver in order to achieve

optimum performance.

on RMS



off RMS



-----------------------

–

---------------------------

Fig 13. Electro-optical characteristic: relative transmission curve of the liquid

on RMS



th on





off RMS



th off





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