Which of the following is a disadvantage of LCDs and TFTs?

The selected answer highlights a significant disadvantage of LCDs (Liquid Crystal Displays) and TFTs (Thin-Film Transistors). These display technologies often struggle to achieve true black levels due to the way they produce images. LCDs work by using a backlight that shines through liquid crystals, and even when the pixels are meant to be black, some light can still bleed through. This results in blacks appearing more like dark grays, which can diminish the overall contrast of the image and lead to a less immersive viewing experience.

The other options highlight advantageous characteristics of LCD and TFT technologies. For example, producing less glare is beneficial as it enhances visibility in bright environments. Being light contributes to the ease of transport and installation of these displays, while being cost-effective points to their affordability, making them widely accessible. Each of these traits serves to underscore the strengths of LCDs and TFTs, in contrast to the noted weakness regarding their black performance.