Ham Radio General Class Practice Test

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Which of the following is a characteristic of a liquid crystal display?

It requires ambient or back lighting
It offers a wide dynamic range
It has a wide viewing angle
All of these choices are correct

The correct answer is: It requires ambient or back lighting

A liquid crystal display (LCD) is designed to be illuminated by either ambient light or backlighting. Unlike traditional monitors that emit light, an LCD relies on light passing through liquid crystals which can modulate the light to create images. This characteristic of requiring a light source is fundamental to the operation of an LCD, making it necessary for visibility in various environments. While it is true that LCDs can offer decent dynamic range and have varying viewing angles, these characteristics can differ significantly between types of LCD technologies. For instance, certain models may have limited viewing angles and may not perform as well in terms of dynamic range compared to other display technologies like OLED. Therefore, ambient or backlighting is the primary distinguishing feature that is consistently required across virtually all liquid crystal display technologies.