PCF8811USLASH2DASLASH1 datasheet(47/81 Pages) NXP

47 / 81 page

PCF8811_4

Product data sheet

Rev. 04 — 27 June 2008

47 of 81

NXP Semiconductors

PCF8811

80 x 128 pixels matrix LCD driver

12.9 Bias levels

The bias levels for a MRA (Multiple Row Addressing) driving method with p = 8 are given

in Figure 34 when Gmax and F have the same value. The value p deﬁnes the number of

rows which are simultaneously selected.

The row voltage F depends on the multiplex rate selected (number of rows N), the

threshold voltage of the liquid (VTH), the number of simultaneously selected rows (p) and

the multiplexibility (m):

(1)

The column voltages are situated around the common level VC. The column voltage levels

are equidistant from each other. In Table 23 the column voltage levels are given as a

function of F.

Fig 34. Bias levels for an MRA system with p = 8 and Gmax = F

Table 23.

Bias levels for MRA driving method

Symbol

Bias voltages

DC shifted bias voltages

F = Gmax

VLCD

FVLCD

V3_H

V2_H

V1_H

⁄

2VLCD

V1_L

V2_L

mgw752

0.25Gmax

0.50Gmax

0.75Gmax

Gmax = F = VLCD

VLCD

V3_H

V2_H

V1_H

V1_L

V2_L

V3_L

VSS

−Gmax = F = VSS

−0.75Gmax

−0.50Gmax

−0.25Gmax

-------

----

–

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

–

()

–

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

LCD

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

–

()

–

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





–

()

–

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

LCD

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

–

()

–

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





–

()

–

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

LCD

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

–

()

–

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





–

()

–

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

LCD

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

–

()

–

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

–





–

()

–

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

LCD

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

–

()

–

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

–





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