The season of preparation for Easter closed with the Great or Black Week, also known as the Holy Week. The Thursday of Holy Week commemorated the institution of the Holy Supper. Since the Gospel of the day was John 13:1-15, the day was also known as the Day of Foot Washing.
Cathode ray tube, or CRT, screens like those that were once used for computer monitors and TV sets actually do emit low levels of UV radiation. However, these levels are significantly lower than that of the sun. The fluorescent light bulb above your head emit actually emits more UV light than a CRT monitor.
Backlight Updated: 12/20/2017 by Computer Hope LCD screens are unable to illuminate themselves, so they require a backlight to provide the illumination, thus creating a viewable picture on the screen. Backlights can provide illumination from the back or the side of the screen, which are different from front lights that illuminate from the front.