7. COMMAND
S1D15722D01B000 Technical Manual (Rev.1.1)
EPSON
49
(4) When changing the number of display lines
*1: When the number of liquid crystal display lines is changed, the liquid crystal drive voltage from which
optimal contrast is obtained changes. To avoid the problem of the display, for example, the display turns
black for an instant, place in the power save mode in the above sequence and turn off the display once.
Then set to obtain the optimal liquid crystal drive voltage before displaying again.
*2: To change the liquid crystal drive voltage, discharge the capacitor for holding the voltage once.
*3: Set to the number of frame frequency that won’t cause display problem such as a flicker.
*4: Set to the number of n line inversions that won’t cause display problem such as a flicker.
Optional state
End of change of the number of display lines
Set functions by command input (user-configuration)
(23) Power
save
ON
*
1
Set functions by command input (user-configuration)
(22) Discharge
ON
*
2
Set functions by command input (user-configuration)
(17) Set number of display lines
(21) Set clock frequency
*
3
(12) Set n line inverted drive register
*
4
Set functions by command input (user-configuration)
(22) Discharge
OFF
Set functions by command input (user-configuration)
(23) Power
save
OFF
Secure the discharge time
of the capacitor for
stabilizing the liquid crystal
voltage until V
3
< 15V is
attained. Since the
discharge time depends on
the state of external
circuits, including the V
3
voltage before discharge
and the capacity value of
the capacitor, be sure to
secure the time with
sufficient margin after
evaluation.
Change external LCD voltages to target voltages.
<When external bias voltages are used>
Start the external bias voltages
<When external clock is used>
Start the external clock
<When external bias voltages are used>
Stop the external bias voltages
<When external clock is used>
Stop the external clock
