Aspect

Electronic paper (E-paper / E-ink)

LCD (Liquid Crystal Display)

Working principle

Uses electrophoretic micro capsules: charged pigment particles move up or down under an electric field, changing the visible colour of each capsule.

Light modulating liquid crystal layer sandwiched between two polarizers; applying voltage rotates the crystals, altering the polarisation of back light that passes through.

Light source

Reflective – ambient light is reflected by the capsule surface; no back light is required.

Emissive – requires a back light (LED, edge lit or direct type) to provide illumination.

Power consumption

Power is only needed when the image is changed; the display is bistable and can hold a picture for weeks or months without power.

Continuous power is needed to drive the back light and the LC matrix, so standby power is much higher.

Display quality

Paper like appearance, very wide viewing angle, excellent readability in bright sunlight, low glare.

Bright, vivid colours but limited contrast in strong ambient light; viewing angle is narrower than E-paper.

Refresh speed / motion

Slow (hundreds of ms to seconds) – suited for static text or images.

Fast (millisecond response) – supports video, gaming and complex animations.

Color capability

Primarily black white; colour versions exist (e.g., black white red or limited three colour) but are slower and less saturated.

Full colour RGB panels are standard; colour depth and saturation are high.

Thickness & flexibility

Ultra thin (≈0.1mm) and can be built on flexible plastic substrates, enabling bendable displays

Typically thicker because of the back light and glass substrates (≈0.5–1mm); flexibility is limited.

Typical applications

E-readers, electronic price tags, low power signage, smart watches, IoT displays where long battery life and sunlight readability are critical.

Smartphones, tablets, laptops, TVs, monitors, automotive dashboards – any device needing fast, full colour, video capable output.