Planar LC640.480.33-AC - Manual (Page 21)

LC640.480.33-AC Operations Manual (OM600-01) 19
Optical Features
Viewing Angle
Viewing angles are defined per Figure 10 below:
Figure 10. Viewing Angles.
θ
-V
θ
-H
θ
+V
θ
+H
Normal Line
6 o’clock direction
where: θ
+H
+Horizontal angle (+70)
θ
-H
-Horizontal angle (-70)
θ
+V
+Vertical angle (+40)
θ
-V
-Vertical angle (-60)
and R/L and U/D = default
Response Times
The rise response time (from white to black) is 25 ms typical and the fall response time
(from black to white) is 45 ms typical. This is shown in Figure 11.
Figure 11. Response Times.
τ r = Rise (wht to blk): 25 ms typ
τ f = Fall (blk to wht): 45 ms typ
white
τ r
black white
100%
90%
10%
0%
Photo-
detector
output
(Relative Value)
τ f
time
Dimming
Initial backlight dimming is performed by decreasing tube current, allowing for
substantially higher tube life in applications that do not require maximum luminance.
The user can adjust the display for the optimum combination of luminance, life, and
power consumption for the target application.