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| 型號(hào)： | ISD2353 |
| 廠商： | Osram Opto Semiconductors GmbH |
| 英文描述： | Sunlight Readability Contrast Measurements |
| 中文描述： | 日光可讀性對(duì)比測(cè)量 |
| 文件頁(yè)數(shù)： | 3/4頁(yè) |
| 文件大小： | 146K |
| 代理商： | ISD2353 |
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
3
May 31, 2000-14
Contrast Measurements
The ability to read a display in direct sunlight used to be deter-
mined by using a series of standard observers and irradiating
the display with one sun. Recent technical studies have estab-
lished contrast criteria permitting laboratory measurements
that verify sunlight readability.
A yellow ISD2351 and a high efficiency green ISD2353 Small
Alphanumeric Display were evaluated for sunlight readability
under a simulated sun with an incident of 4200 fc. These two
displays were tested with both pass-band and neutral density
AR/CP filters. The measurement technique and results follow.
Figure 1. Sunlight readability contrast measurement setup
Contrast Measurement Setup
Contrast measurements require the use of a spot photometer,
which measures the luminance of the surface within a specific
spot size. A Photo Research Spectra Pritchard spot photometer
Model 1980B with a Macro Spectar MS-80 Lens was calibrated
and set to read out in foot Lamberts, fL. The display and filter
were mounted on a micro adjustable X/Y/Z stage. This stage,
the spot photometer, and a 500 W Unimat LX80 light source
were mounted on a optical bench. The light source was ori-
ented 30
°
from the normal of the display. See Figure 1.
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