PCF88331 datasheet(56/112 Pages) PHILIPS

56 / 112 page

2003 Feb 14

Philips Semiconductors

Objective speciﬁcation

STN RGB - 132

× 132 × 3 driver

PCF8833

6.2.42

FRAME FREQUENCY PROGRAMMING IN 8-COLOUR MODE

When the Idle mode is selected (see Section 6.2.29) the frame frequency is determined from division factor DF8. In the

Idle mode the PCF8833 works in 8-colour mode and therefore a lower frame frequency can be chosen which will be the

same over the whole temperature range. Calculation of the frame frequency and determining the division factor is the

same as explained in Section 6.2.41.

When Partial mode is selected (see Sections 6.2.10 and 6.2.23) the same frame frequency will be used as for the full

Display mode in Idle mode.

Table 69 Frame frequency programming in 8-colour mode register bits; note 1

Note

1. X = don’t care.

6.2.43

SET BIAS SYSTEM

The LCD supply voltage and the bias voltages, which can be chosen, depend on the Liquid Crystal (LC) that is used. In

equation (3) the relationship between the VON/VOFF ratio of LC parameters and the bias system (a) for a given display

size (N) is given.

(3)

D/C

76543210

DEFAULT

011000110

C6H

DF86

DF85

DF84

DF83

DF82

DF81

DF80

35H

handbook, full pagewidth

MGU940

frame

frequency

T (

°C)

−40

−11

DFA

DFC

DFB

DFD

Fig.31 Segmented temperature frame frequency.

OFF

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

N2a

–

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

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