Visual Assessment of Angular Response in Medical Liquid Crystal Displays
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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.
Key WordsViewing angle angular contrast goniometric measurements AMLCD medical display visual threshold
The authors acknowledge equipment loans from Barco NV (Belgium), Philips/FIMI (Saronno, Italy), and National Display Systems (Morgan Hill, CA, USA).
- 2.Fifadara DH, Averbukh A, Channin DS, Badano A: Effect of viewing angle on luminance and contrast for a five- and a nine-million-pixel medical liquid crystal display. J Digit Imaging, 2004Google Scholar
- 4.Fetterly, KA, Samei, E 2005Photographic measurement of the effects of viewing angle on the luminance and contrast of liquid crystal displaysProc SPIE5744263270Google Scholar
- 6.Samei, E, Badano, A, Chakraborty, D, Compton, K, Cornelius, C, Corrigan, K, Flynn, MJ, Hemminger, B, Hangiandreou, N, Johnson, J, Moxley-Stevens, DM, Pavlicek, W, Roehrig, H, Rutz, L, Shepard, J, Uzenoff, RA, Wang, J, Willis, CE 2005Assessment of display performance for medical imaging systems: Executive summary of AAPM TG18 reportMed Phys3212051225PubMedCrossRefGoogle Scholar
- 8.American College of Radiology/National Electrical Manufacturers Assoc. Digital Imaging and Communications in Medicine (DICOM), Part 3.14, Grayscale Standard Display Function. Technical report, ACR/NEMA, January 1998Google Scholar