Which device is used to convert digital values back to analog voltages to drive the display brightness?

• A. Digital to Analog Converter
• B. Analog to Digital Converter
• C. Digital Memory
• D. Scan Converter

Answer: (A)

Brightness on the display is controlled by an analog voltage, so the system must turn digital brightness values into that analog signal. A digital-to-analog converter does exactly that: it takes a digital input (a binary code representing a brightness level) and outputs a proportional analog voltage that drives the display. This lets each pixel reach the intended brightness on the monitor.

In contrast, an analog-to-digital converter would do the opposite—turning an analog signal into a digital value—so it isn’t used to drive brightness. A digital memory merely stores data, and a scan converter handles converting image data for display formats, not directly converting digital values to the analog signal that controls brightness.