EL640.480 AG1 Series User’s Manual (020-0350-00B)
12
Optical Performance
Table 7. Optical Characteristics.
Luminance
L
on
(areal), min
L
on
(areal), typ
L
off
(areal), max
40.0 cd/m²
55 cd/m²
0.2 cd/m²
Screen center, 120 Hz frame rate
Screen center, 120 Hz frame rate
5 points: Center plus four corners
Non-uniformity
All pixels fully lit
35%
Max difference two of five points:
LNU%=[1- (min_lum/max_lum)] x 100%
Luminance Variation (Temperature)
Maximum
15%
Across operating temperature range
Luminance Variation (Time)
Maximum 20%
10,000 hours at 25
°
C ambient
Viewing Angle
Minimum
160
°
Contrast Ratio
Typical 33:1
5:1
2.2:1
@ 500 lux, 120 Hz
@ 5000 lux, 120 Hz
@15000 lux, 120 Hz
Dimming
The EL640.480-AG1 display uses frame rate dimming, which allows the display
brightness to be lowered proportionally by reducing the frame rate. This is
performed within the application by lowering the frame rate of the video input
signals. Because brightness is proportional to the frame rate, the display can be
dimmed by adding pauses between every horizontal period. The lowest useable
frame rate (brightness) is dependent on the perceived flicker of the displayed
image, but will most likely be around 60 Hz.
In addition to frame rate dimming, the EL640.480-AG1 ET display features analog
dimming which dims the display to approximately 5% of the full brightness by
connecting a 50K ohm logarithmic external potentiometer to the dimming port.
Alternatively, an external voltage or current mode D/A converter may be used to
facilitate dimming by sinking a maximum of 250 µA (for maximum dimming)
from pin 1 to pin 2 of the dimming port.
For more information on frame rate dimming please see Planar Application
Note 120.
