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Depending on the duty cycle of the spike noise voltage for the whole display period, the ease with which
light leaks due to C
Lowering the luminance of the display is also effective.
E
K
R
L
T0
T1
S0
316
CHAPTER 15 VFD CONTROLLER/DRIVER
varies. The fewer the number of digits displayed, the easier it is for light to leak.
SG
Figure 15-12. Light Leakage due to C
µ
PD780205
V
DD
S0 _
T0 _
R
R
L
L
E
K
V
LOAD
: Cut-off voltage
: On-chip pull-down resistor
Figure 15-13. Waveform of Light Leakage due to C
User's Manual U11302EJ4V0UM
SG
+ 5 V
FIP
Segment
C
SG
grid
filament
_ 30 V
SG
E
K
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