Display technologies in MSI/SSI interfacing: Which display type controls the reflection of available ambient light rather than emitting light by itself?

Introduction / Context:
Digital systems often drive visual indicators. Some displays emit light (requiring drive current), while others modulate ambient light and are readable with external illumination. Understanding which technology controls reflected light helps in low-power, sunlight-readable, or passive indicator designs.

Given Data / Assumptions:

• We compare common display classes: LED (light-emitting), LCD (liquid crystal), and others.
• “Controls the reflection of available light” means the display is non-emissive and works by modulating how much ambient light is reflected toward the viewer.
• No backlight is assumed when assessing the inherent optical principle.

Concept / Approach:
Liquid Crystal Displays (LCDs) are passive, non-emissive devices. In reflective LCDs, the liquid crystal shutters and polarizers control how much ambient light is reflected back. By contrast, Light Emitting Diodes (LEDs) generate light via electroluminescence and are emissive. “MOS” is a transistor process, not a display type; “LSC” is not a standard display acronym; Electroluminescent (EL) panels emit light as well.

Step-by-Step Solution:

Verification / Alternative check:
Reflective LCD watches and calculators remain readable without backlights, relying on ambient illumination. This empirical behavior confirms their non-emissive, reflective nature.

Why Other Options Are Wrong:

Common Pitfalls:
Assuming all LCDs emit light due to seeing backlit panels—those use added backlights; the LCD itself modulates light.

Final Answer:
LCD