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LCX026AL

3. 6-dot Simultaneous Sampling

The horizontal shift register samples signals SIG1 to SIG6 simultaneously. This requires phase matching

between signals SIG1 to SIG6 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 the sample-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 SIG1 to SIG6 are exactly reversed.

S/H

CK1

CK2

SIG3

SIG6

SIG1

SIG3

SIG6

SIG1

SIG2

SIG2

SIG4

SIG4

SIG5

SIG5

CK3

CK4

CK5

S/H

S/H

S/H

S/H

S/H

CK6

S/H

S/H

S/H

S/H

S/H

6

4

3

5

7

8

HCKn

CK1

CK3

CK5

CK2

CK4

CK6

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