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Buzzer, Backlight, and Display Control
Section 8-2
8-2-4 Turning off the Screen
By turning off the screen while it is not in use, the backlight lasts for a long time and,
at the same time, afterimage on the display panel can be prevented. The backlight
is turned off automatically when the screen is turned off. If the screen saver func-
tion is set to “Display”, however, it is not possible to prolong the life of the backlight
since it is not turned off when the screen is turned off.
The NT31/NT31C provides the following two methods for turning off the screen.
- Using the screen saver function of the NT31/NT31C
- Operating the PT status control area
Notice To prevent the formation of an afterimage, either use the screen saver function or
periodically switch screens.
Reference - The screen can be made to enter the no-display state by specifying screen No.
0. In this state, however, the backlight remains lit or flashing.
- While the screen is in the no-display state, only screen switching operations
from the host are permitted.
- While the screen is set off, the display of the screen immediately before the
screen is turned off remains output by the NT31/NT31C.
Turning off the Screen Using the Screen Saver Function of the NT31/NT31C
If this method is used, the screen is automatically turned off when no operation is
attempted for a preset length of time.
[Setting]
Using the system menu of the NT31/NT31C, set a value other than “000” for
“Screen Saver Start up Time” (the length of time before the screen saver is acti-
vated after the last NT31/NT31C operation) and “Display erased” for “Screen Sav-
er Movement”. (The screen saver function is not executed if “000” is set for
“Screen Saver Start up Time”.)
Reference: If a value is set other than “000” for “Screen Saver Start up Time” and “Display” for
“Screen Saver Movement”, the character string set in character string table No. 0
is displayed on the screen at random. In this case, the backlight is not turned off.
[Operation]
If the NT31/NT31C has not been operated (touch switch operation, screen switch-
ing operation) for the preset length of time during operation of the NT31/NT31C,
the screen is automatically turned off.
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