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LCX021AM

3. 18-dot simultaneous sampling

The horizontal shift register samples SIGB1 to SIGB6, SUGG1 to SIGG6 and SIGR1 to SIGR6 signals

simultaneously. This requires phase matching between signals SIGB1 to SIGB6, SIGG1 to SIGG6 and SIGR1

to SIGR6 to prevent the horizontal resolution from deteriorating. Thus phase matching between each signal is

required using an external signal delaying circuit before applying the video signal to the LCD panel.

The block diagram of the delaying procedure using simple-and-hold method is as follows. The following phase

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

level), the phase settings for signals SIGB1 to SIGB6, SIGG1 to SIGG6 and SIGR1 to SIGR6 are exactly

reversed.

S/H

CK1

CK2

CK3

CK4

CK5

S/H

S/H

S/H

S/H

S/H

CK6

S/H

S/H

S/H

S/H

S/H

SIGB1, SIGG1, SIGR1

SIGB2, SIGG2, SIGR2

SIGB3, SIGG3, SIGR3

SIGB4, SIGG4, SIGR4

SIGB5, SIGG5, SIGR5

SIGB6, SIGG6, SIGR6

SIGB1, SIGG1, SIGR1

SIGB2, SIGG2, SIGR2

SIGB3, SIGG3, SIGR3

SIGB4, SIGG4, SIGR4

SIGB5, SIGG5, SIGR5

SIGB6, SIGG6, SIGR6

HCKn

CK1

CK3

CK5

CK2

CK4

CK6

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