220-801 · Question #56
Which of the following is the MAIN difference between an LCD display and an LED display?
The correct answer is B. The source of the backlighting. LCD and LED displays differ primarily in how they produce backlighting, not in pixel technology or size. Both use liquid crystal panels, but the light source behind them differs.
Question
Options
- AThe ability to use external displays
- BThe source of the backlighting
- CThe viewable size of the display
- DThe size of the pixel display
How the community answered
(68 responses)- A4% (3)
- B93% (63)
- C1% (1)
- D1% (1)
Why each option
LCD and LED displays differ primarily in how they produce backlighting, not in pixel technology or size. Both use liquid crystal panels, but the light source behind them differs.
Both LCD and LED displays can support external display connections, so this is not a distinguishing characteristic between the two technologies.
LCD displays use cold cathode fluorescent lamps (CCFL) as their backlight source, while LED displays use light-emitting diodes. This distinction affects power consumption, brightness, contrast ratio, and thinness of the panel, making backlighting the defining technical difference between the two technologies.
Viewable screen size is a manufacturing choice unrelated to whether a display uses CCFL or LED backlighting.
Both LCD and LED displays use the same liquid crystal pixel technology; the pixel structure itself does not differ between the two.
Concept tested: LCD vs LED display backlighting technology
Source: https://www.comptia.org/training/books/a-core-1-220-1101-study-guide
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