Journal of Digital Imaging

, Volume 19, Issue 3, pp 240–248 | Cite as

Visual Assessment of Angular Response in Medical Liquid Crystal Displays

  • Aldo BadanoEmail author
  • Sarah Schneider
  • Ehsan Samei

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 Words

Viewing 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).


  1. 1.
    Blume, H, Steven, P, Ho, A, Roehrig, H, Fan, J, Amarpreet, C, Ghandi, K 2003Characterization of physical image quality of 2- and 5-million-pixel monochrome AMLCDs for medical imagingProc SIDXXXIV932CrossRefGoogle Scholar
  2. 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
  3. 3.
    Badano, A, Fifadara, DH 2004Goniometric and conoscopic measurements of angular display contrast for one-, three-, ?ve-, and nine-million-pixel medical liquid crystal displaysMed Phys3134523460PubMedCrossRefGoogle Scholar
  4. 4.
    Fetterly, KA, Samei, E 2005Photographic measurement of the effects of viewing angle on the luminance and contrast of liquid crystal displaysProc SPIE5744263270Google Scholar
  5. 5.
    Badano, A, Flynn, MJ, Martin, S, Kanicki, J 2003Angular dependence of the luminance and contrast in medical monochrome liquid crystal displaysMed Phys3026022613PubMedCrossRefGoogle Scholar
  6. 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
  7. 7.
    Badano, A, Fifadara, DH 2004Comparison of Fourier-optics, telescopic, and goniometric methods for measuring angular emissions from medical liquid–crystal displaysAppl Opt4349995005PubMedCrossRefGoogle Scholar
  8. 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
  9. 9.
    Badano, A, Flynn, MJ 2000Method for measuring veiling glare in high performance display devicesAppl Opt3920592066PubMedGoogle Scholar

Copyright information

© SCAR (Society for Computer Applications in Radiology) 2006

Authors and Affiliations

  1. 1.Center for Devices and Radiological HealthU.S. Food and Drug AdministrationRockvilleUSA
  2. 2.Duke Advanced Imaging Laboratories, Departments of Radiology, Physics, and Biomedical EngineeringDuke University and Duke University Medical CenterDurhamUSA

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