PCF8545ATT datasheet(45/103 Pages) NXP

45 / 103 page

PCA8530

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Product data sheet

Rev. 2 — 25 September 2014

45 of 103

NXP Semiconductors

PCA8530

Automotive 102 x 4 Chip-On-Glass LCD segment driver

Discrimination is the ratio of Von(RMS) to Voff(RMS) and is determined from Equation 6:

(6)

VLCD is sometimes referred as the LCD operating voltage.

8.10.5.1

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 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 Vth(off)) and the other at 90 % relative transmission (at Vth(on)), see

Figure 24.

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

(7)

(8)

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

of a, n (see Equation 4 to Equation 6) 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 24. Electro-optical characteristic: relative transmission curve of the liquid

on RMS



th on





off RMS



th off





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