CHAPTER 15 VFD CONTROLLER/DRIVER
316
User’s Manual U11302EJ4V0UM
Depending on the duty cycle of the spike noise voltage for the whole display period, the ease with which
light leaks due to C
SG
varies. The fewer the number of digits displayed, the easier it is for light to leak.
Lowering the luminance of the display is also effective.
Figure 15-12. Light Leakage due to C
SG
E
K
: Cut-off voltage
R
L
: On-chip pull-down resistor
Figure 15-13. Waveform of Light Leakage due to C
SG
PD780205
_30 V
V
LOAD
+ 5 V
V
DD
S0 _
T0 _
C
SG
FIP
Segment
grid
filament
R
L
R
L
E
K
µ
T0
T1
S0
E
K
Содержание mPD780208 Subseries
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