Effect of test patterns on measurement of the luminance of LCD devices by use of a telescopic-type luminance meter.
Quality assurance of electronic display devices is important for maintaining reliable soft-copy image interpretations. This paper presents effects of test patterns on measurement of the luminance of liquid-crystal display (LCD) devices by use of a telescopic-type luminance meter. The luminance for different types of test patterns having different backgrounds and measurement areas was measured and compared with the results obtained with AAPM task group-18 (TG-18) LN test patterns. The luminance measured for the test patterns with a black background was lower than that measured for TG-18 LN test patterns due to the light emitted from the outside the focused area of the telescopic-type luminance meter. Also, the luminance obtained with smaller measurement areas indicated lower luminance. These tendencies were particularly obvious at low luminance. The luminance of the LCD device by use of a telescopic-type luminance meter should be measured with test patterns that have a black background and a smaller measurement area than that for the TG-18 LN test patterns.
Morishita
Junji
J
Department of Health Sciences, Faculty of Medicine, Kyushu University, Higashiku, Fukuoka, Japan. jm@shs.kyushu-u.ac.jp
Dogomori
Kiyoshi
K
Hatanaka
Shiro
S
Hiwasa
Takeshi
T
Nakamura
Yasuhiko
Y
Hashimoto
Noriyuki
N
Higashida
Yoshiharu
Y
Toyofuku
Fukai
F
Ohki
Masafumi
M
D004581:Electronics; D050866:Liquid Crystals / Q000737:chemistry*; D008163:Luminescent Measurements / Q000295:instrumentation / Q000379:methods*; D011785:Quality Assurance, Health Care; D011856:Radiographic Image Enhancement / Q000295:instrumentation / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
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