Question
In an LCD display, what is the main purpose of the liquid crystal layer positioned between the two glass plates?
The correct answer is
To control the transmission of light through the display
In a Liquid Crystal Display (LCD):
- Two glass plates with transparent electrodes sandwich the liquid crystal (LC) layer.
- LC molecules rotate polarized light when no electric field is applied (typically ON state or OFF, depending on type).
- Applying a voltage realigns the LC molecules, controlling the transmission of polarized light through the panel.
- A backlight provides the light source; polarizers on each side complete the optical system.
The LC layer itself is not a light source — it only modulates light.
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