ACX306 SONY [Sony Corporation], ACX306 Datasheet - Page 20

• Manufacturer Part Number: ACX306
• Description: 3.86cm (1.5 Type) NTSC/PAL Color LCD Panel
• Manufacturer: SONY [Sony Corporation]

3. RGB Simultaneous Sampling
The horizontal driver samples R, G and B video signal simultaneously, which requires phase matching
between the R, G and B signals to prevent the horizontal resolution from deteriorating. Thus phase matching
by an external signal delay circuit is needed before applying the video signal to the LCD panel.
Two methods are applied for the delaying procedure: Sample-and-hold and Delay circuit. These two block
diagrams are as follows.
The ACX306AK has a right/left inversion function. The following phase relationship diagram indicates the
phase setting for right scan (RGT = high level). For left scan (RGT = low level), the phase setting should be
inverted for the B and G signals.
(1) Sample-and-hold (right scan)
<Phase relationship of delaying sample-and-hold pulses> (right scan)
(2) Delay element (right scan)
G
R
G
B
R
B
CKB
S/H
HCKn
CKG
CKR
CKB
Delay
CKR
S/H
Delay
Delay
CKG
CKG
CKG
S/H
S/H
S/H
– 20 –
AC Amp
AC Amp
AC Amp
AC Amp
AC Amp
AC Amp
22
21
20
22
21
20
BLUE
RED
GREEN
BLUE
RED
GREEN
ACX306AK