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LCX005BKB

3. RGB Simultaneous Sampling

Horizontal driver samples R, G and B signal simultaneously, which requires the phase matching between R,

G and B signals to prevent horizontal resolution from deteriorating. Thus phase matching between each

signal is required using an external signal delaying circuit before applying 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 LCX005BKB has the right/left inverse function. The following phase relationship diagram indicates the

phase setting for the right scan (RGT = High level). For the left scan (RGT = Low level), the phase setting

shall be inverted between B and G signals.

(1) Sample and hold (right scan)

<Phase relationship of delaying sample-and-hold pulses> (right scan)

S/H

S/H

AC Amp

S/H

AC Amp

S/H

AC Amp

S/H

(2) Delay circuit (right scan)

Delay

Delay

AC Amp

Delay

AC Amp

AC Amp

4

3

B

R

G

BLUE

RED

GREEN

CKB

CKR

CKG

CKG

CKG

HCKn

CKB

CKR

CKG

BLUE

RED

GREEN

B

R

G

2

4

3

2