R
EM6124
Typical V
LCD
Programming
Checker and Checker Inverse
A fast check display can be easily created setting
initialization bits 12 and 13 (called “Checker” and “Inv.
Checker”). The display is completely checked with only 2
initialization sequences, one “Checker” and one “Inv.
Checker”. For Checker, the pattern fills the display with
alternately ON and OFF pixels as shown in Fig. 10. For
Inv. Checker, everything is inverted (see Fig.18.14 and
18.15).
Pattern of Checker Mode
Fig. 10
Internally Generated V
LCD
versus Temperature
Fig. 8
Temperature Control
Due to the temperature dependency of liquid cristals
viscosity the LCD controlling voltage V
LCD
must be
increased for lower temperatures to maintain optimal
contrast. The EM6124 is available with 4 different
temperature coefficients (see Fig. 9). The coefficient is
selected by 2 bits in the initialization code TC bits 10 and
11. Table 11 shows the typical values of the different
temperature coefficients. They are proportional to the
programmed V
LCD
.
Typical Values of the Temperature Coefficients
Bit 10, Bit 11
Value
Unit
00
mV/°C
-0.2 x V
LCD
01
-0.52 x V
LCD
mV/°C
-1.16 x V
LCD
10
mV/°C
-1.82 x V
LCD
11
mV/°C
Table 11
Fig. 11
Temperature Coefficients
Fig. 9
Copyright
©
2004, EM Microelectronic-Marin SA
7
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EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
