ViewSonic ViewPanel VP140 Service Manual page 3

1 LCD Basics
1-1 Figure
1 shows abasic LCD model, images can be reoroduced by applying
the followng three kinds of sigals to
the -CD pane:
(1) Digital video ¢ gna'
(2) Synchronizing signal
(3) Clock
Similar to the CRT scanning lives, the cigital video signal (1) scars trom the upper lett
of the screen according to the synchronizing signal (2)
Fig. 1 Basic Mode! of LCD
er to the 'ower right corre"
Personal Lo
'Computer
> Distal video
Avaleg Wiese Sina | Siena
P| NO Convener
Syne Signa
Fig. 2 Video Data Scan Image
1-2 LCD Panel (Pixel Configuration)
The LOD has fis pixels completely separated wt 'atice form as shown in Figere 3.
Fig. 3 LCD Pixel Configuration
The above pixel co-figuration provices tre LCD with the fellowing features,
(1) Good in:er-aixe! optical transient characterstics
Characters are easy to read because o! sharp separaticn of ders.
(2) Treoret cally free of geometric distertion and convergence dewauons.
4-3. Necessity of Pixel Replacement
net casically possible to change the harzonta! and vertcal amplitudes of the image because the LCD is assured
10 be used witnits pixels corresponcing 10-1 to the viceo output oixels of a persona! computer or other terminal
vP140