Aging and Quality Control of Color LCDs for Radiologic Imaging

Abstract

Our practice has long been concerned with the effects of display quality, including color accuracy and matching among paired color displays. Three years of data have been collected on the historical behavior of color stability on our clinical displays. This has permitted an analysis of the color-aging behavior of those displays over that time. The results of that analysis show that all displays tend to yellow over time, but that they do so together. That is, neither the intra-nor inter-display color variances observed at initial deployment diverge over time as measured by a mean radial distance metric in color space (Commission Internationale d'Eclairage L', u', v' 1976). The consequence of this result is that color displays that are matched at deployment tend to remain matched over their lifetime even as they collectively yellow.

Characterization of Luminance and Color Properties of 6-MP Wide-Screen Displays

“…As mentioned, one possible cause might be sensitivity of the built-in luminance meter to changes in display color point. A shift in u′ and v′ of approximately 2.0 and 2.5 %, respectively, has been observed over 18,000 BLH in other LCD displays [5], although these displays were not radiologist review workstations and therefore had a substantially lower maximum luminance (maximum luminance~100 cd/m 2 ) than the ones used in this study. At acceptance, the color point of MDCC 6230 displays was observed to be very consistent between units with the standard deviations of u′ and v′ both less than 1 % of their mean values.…”

“…Although the color point of a display is independent of luminance [3], it has been demonstrated that color point may affect perceived luminance [4]. Further, it has been demonstrated that the color point of some LCDs changes as the BLH increase [5]. This suggests that previously observed disagreement between externally measured luminance and those reported by a built-in meter may be caused by a luminance meter's sensitivity to changes in color point.…”

Impact of 222 Nm Uv-C Radiation on Color Accuracy of Video Displays in Public Buses

“…The authors examine the effects of aging on the color accuracy and image quality of LCDs, and propose methods for monitoring and maintaining the performance of these displays over time. The article concludes that regular monitoring and calibration of LCDs is essential to ensure that they continue to provide accurate and reliable images for radiological imaging (Walz-Flannigan et al, 2011). Hellen-Halme et al discuss the effect of ageing on the luminance of standard liquid crystal display (LCD) monitors.…”