Spring 1. Variable Refresh Rate. Frequencies that are multiples of 60Hz are better. Add gift options. The flicker frequency of the screen, when all optional flicker has been disabled. However, a lack of any major third party components, along with custom connectors between the tuner and monitors, meant that systems mixing fully compatible elements were never effectively realized. Shows the TV's frequency response at quiet listening levels. We can see what appears to be the effect of this layer in the contrast , viewing angle , and reflections. TV Recommendations. The dim images, constant adjustments and high costs had kept them in a niche of their own.