6.0 SCREEN DISPLAY & PERFORMANCE SPECIFICATION
6.1 CRT specification
Cathode ray tube to be used 21 inch flat (diagonal) tube with 90 degrees magnetic deflection and low voltage
focus.(Samsung M51QEQ991X001 )
6.1.1 Type ：21” in line anti-glare anti-static tube
6.1.2 Phosphor ：P22 medium short persistence phosphor
6.1.3 Dot trio pitch ：0.25mm
6.1.4 Light transmission ： 50% Center
6.1.5 Implosion protection ：Tension band
6.2 Active Display Area
Horizontal ：390 ± 4.0mm
Vertical ：290 ± 4.0mm
All modes must be able to meet the above spec. by adjusting horizontal size and vertical size from front panel.
6.3 Picture Centering (refer to FIG.5)
Horizontal centering ：︱g3-g4︱≦4mm
Vertical centering ：︱g1-g2︱≦4mm
All modes must be able to meet the above spec. by adjusting horizontal position and vertical position from front
panel.
6.4 Tilt (refer to FIG.6)
Maximum ：2.0mm
6.5 Trapezoid Distortion (refer to FIG.4)
Vertical ：2.0mm
Horizontal ：2.0mm
6.6 Geometry Distortion
a. Barrel (refer to FIG.3)
Top & bottom ：a2≦1.5mm , b2≦1.5mm
Left & right ：c2≦1.5mm , d2≦1.5mm
b. Pincushion (refer to FIG.2)
Top & bottom ：a1≦2.0mm , b1≦2.0mm
Left & right ︰c1≦2.0mm , d1≦2.0mm
6.7 Linearity (refer to FIG.1)
Horizontal ︰ ( Xmax. – Xmin. ) / ( Xmax. + Xmin. )×100% ≦5%
Vertical ： ( Ymax.–Ymin .) / ( Ymax. + Ymin. )×100% ≦5%
6.8 Size variation
Picture size deviation should not change beyond the specification with the following variance.
a. High Voltage variance, max.
From 1 to 20FL ：1.5mm
b. Temperature variance, max.
Across op. Range ：2.5mm
c. Line voltage, max.
Across op. Range ：2mm
d. Wavy, Jitter & Noise
Viewed at 50cm ：No objectionable.
ViewSonic Corporation
9
Confidential – Do Not Copy
G220f-1_G220fB-1
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