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参数资料
| 型号： | ISD2351 |
| 厂商： | Osram Opto Semiconductors GmbH |
| 英文描述： | Sunlight Readability Contrast Measurements |
| 中文描述： | 日光可读性对比测量 |
| 文件页数： | 4/4页 |
| 文件大小： | 146K |
| 代理商： | ISD2351 |
www.infineon.com/opto 1-888-Infineon (1-888-463-4636)
OSRAM Opto Semiconductors GmbH & Co. OHG Regensburg, Germany
www.osram-os.com +49-941-202-7178
2000 Infineon Technologies Corp. Optoelectronics Division San Jose, CA
Appnote 47
4
May 31, 2000-14
Figure 2. LEDs selected for measurement
The sterance measurements were made using the photometer
with an angle setting of 2 minutes resulting in a spot size of
.004 in. The incidence flux was determined by using a Kodak
6080 standard lambertian reflector painted slide.
The X/Y/Z stage supported the display, the AR/CP filter, and the
display drive electronics. Figure 3 shows the asterisk (*) pro-
grammed on the display. Each LED had a duty factor of ON
17.6%. The center of the asterisk was used as the measure-
ment LED. The stage was used to position the display at the
four contrast measurement points as shown in Figure 2.
Contrast Calculations
The data derived from the spot photometer was used to calcu-
late the three contrast ratios, C
1
was the average of three spot locations. Figure 3 shows these
as L
a
, L
b
, L
c
. L
a
is the substrate sterance between two LED die,
L
b
is the substrate sterance of the area between four LED die;
and L
c
is the sterance of a gold trace connecting the LEDs.
, C
2
, C
3
. For best accuracy, L
B
See Figure 3
for exploded view
Figure 3. Points for luminous stearance measurement
Measurements were made using a yellow ISD2351 and a
Marks MPC80-10C neutral density gray filter. This display had a
typical intensity of 2450 μcd/LED with an average wavelength
of 585 nm.
Measurements were also made using a green ISD2353 with a
Marks MPC50-22C yellow/green bandpass filter and a Marks
MPC80-10C neutral density gray filter. This display had a typi-
cal intensity of 3470 μcd/LED with an average wavelength of
572 nm.
The data and results of the experiment are shown in Table 2.
Conclusion
From the data, the most readable combination is the green
ISD2353 display and a green bandpass AR/CP filter, followed by
the green display and the 10% transmissive neutral density
gray AR/CP filter. In both cases these combinations exceeded
the military limit by almost 2.5 times. The yellow display has
optimum contrast with a neutral density AR/CP gray filter.
Lc
Ld
La
Lb
Table 2. Luminous contrast at 4200 fc
Display Color
Filter Model #
Status
Footlamberts
L
a
L
b
L
c
L
d
L
B
C
1
C
2
Green
MPC50-22C
LED-On
LED-Off
12.00
11.00
10.20
9.40
27.10
20.60
101.60
12.60
16.43
13.67
5.18
7.06
0.08
Green
MPC80-10C
LED-On
LED-Off
9.70
8.80
8.60
8.60
17.80
11.40
69.80
10.10
12.03
9.60
4.80
5.91
0.05
Green
MPC50-22C
LED-On
LED-Off
12.60
11.10
11.30
9.80
37.30
17.70
111.00
14.40
15.30
12.87
6.25
6.71
0.12
Yellow
MPC80-10C
LED-On
LED-Off
9.30
7.80
8.20
7.20
19.40
10.30
46.50
7.70
12.30
8.43
2.78
5.04
0.09
Yellow
No Filter
LED-On
LED-Off
208.00
198.00
198.00
171.00
650.00
853.00
480.00
171.00
352.00
407.33
0.36
1.81
0.58
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