Visual assessment of angular response in medical liquid crystal displays.
In spite of having non-Lambertian emission, displays based on liquid crystal technology are becoming popular for medical diagnostic work stations. For all liquid crystal displays (LCDs), the contrast performance varies with viewing direction. Accurate measurements of the angular distribution of light emission require expensive instrumentation and extensive expertise. We investigated the possibility of using a test pattern to visually assess the angular response performance of LCDs. We found that this procedure offers the end user of displays a simple, fast, and relatively consistent technique to verify that the viewing angle performance of the display device is within certain acceptable limits.
Badano
Aldo
A
Center for Devices and Radiological Health, U.S. Food and Drug Administration, 12720 Twinbrook Parkway, Rockville, MD 20857, USA. aldo.badano@fda.hhs.gov
Schneider
Sarah
S
Samei
Ehsan
E
D016287:Computer Peripherals; D015350:Contrast Sensitivity; D003626:Data Display; D006801:Humans; D050866:Liquid Crystals; D008163:Luminescent Measurements; D015588:Observer Variation; D010364:Pattern Recognition, Visual; D011237:Predictive Value of Tests; D011856:Radiographic Image Enhancement; D015203:Reproducibility of Results; D013647:Task Performance and Analysis; D013679:Technology, Radiologic; D014796:Visual Perception