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Improvement Technology of LCD Display
6-8 Improvement of Response Speed
6-8-1 Inpulse System
In order to reduce afterimage and dim outline, there is the system that has the backlight blinked for every
writing of one picture or an all black picture in inserted in the fixed cycle. It is called the "Inpulse System."
For example, with the system called "Super Inpulse System," the black data is written in every 1/60 sec-
ond, and the afterimage and the ghosts are reduced.
Picture Data
6-8-2 FFD (Feed Forward Driving) System
The response speed of LCD brightness can be improved by adding over-shoot characteristic to the data
line voltage. Fig. 29 shows the actual overdrive circuit used in a digital drive system.
Waveform (Normal)
Drive Circuit (Normal)
Black Data
Time
Response
Time
Time
Time
-27-
With the usual LCD panel, since the
picture is displayed continuously,
the front picture becomes dim as
the afterimage.
In the inpulse system, by inserting
black data between the picture
data, the afterimage is reduced and
the
high-speed
improved.
Fig. 28
Over-Shoot
Waveform with Over-Shoot
Time
Overdrive Circuit
Fig. 29
Training Manual Principle of LCD
response
is
Inpulse System
Response Time
(By Overdrive Circuit)
Time
Time
Overdrive Circuit
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