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PCF8576DT/S400/2 Datasheet(PDF) 10 Page - NXP Semiconductors |
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PCF8576DT/S400/2 Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 57 page PCF8576D All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 14 — 10 June 2013 10 of 57 NXP Semiconductors PCF8576D Universal LCD driver for low multiplex rates (3) Using Equation 3, the discrimination for an LCD drive mode of 1:3 multiplex with 1⁄2 bias is and the discrimination for an LCD drive mode of 1:4 multiplex with 1⁄2 bias is . The advantage of these LCD drive modes is a reduction of the LCD full scale voltage VLCD as follows: • 1:3 multiplex (1⁄2 bias): • 1:4 multiplex (1⁄2 bias): These compare with when 1⁄3 bias is used. It should be noted that VLCD is sometimes referred as the LCD operating voltage. 7.3.1 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 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 Vth(off)) and the other at 90 % relative transmission (at Vth(on)), see Figure 6. For a good contrast performance, the following rules should be followed: (4) (5) Von(RMS) and Voff(RMS) are properties of the display driver and are affected by the selection of a, n (see Equation 1 to Equation 3) 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 just 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. D V on RMS V off RMS ----------------------- a 2 2a n ++ a 2 2a – n + --------------------------- == 3 1.732 = 21 3 ---------- 1.528 = V LCD 6V off RMS 2.449V off RMS == V LCD 43 3 ---------------------- 2.309V off RMS == V LCD 3V off RMS = V on RMS V th on V off RMS V th off |
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