Reflective LCD vs e-paper: which display to specify
Reflective LCD (RLCD) and e-paper both read by ambient light and both run on milliwatts. They differ on motion, colour, temperature and what happens when the content changes. This page sets the two side by side so the choice follows from the product, not the brochure.
Last reviewed September 2026 by the Stellar Displays applications team.
Which one should you specify?
Specify a reflective LCD when the content moves, needs full colour, or the product operates outside the temperature range a bistable display tolerates. Specify e-paper when the content is static for hours at a time, monochrome or limited colour is acceptable, and holding an image with zero power matters more than refreshing it.
If the product must also be read in the dark without a front light, neither is the right answer alone. That is where a transflective LCD earns its place.
Video or animation
Reflective LCD refreshes at panel rate. E-paper refreshes in hundreds of milliseconds and ghosts between frames.
Colour
Reflective LCD is full colour. Colour e-paper is limited in gamut and saturation, and slower to update than monochrome.
Power at rest
E-paper holds an image with no power. A reflective LCD holds a static frame at milliwatts, which is still below most backlit panels by two orders of magnitude.
Temperature
Reflective LCD modules are specified for continuous operation across an industrial range. Most e-paper is rated for a narrower band and slows further in the cold.
Sunlight
Both improve as ambient light rises, because both reflect it. Neither has a backlight to wash out.
Side by side, with transflective and transmissive for reference
| Criterion | Reflective LCD | E-paper | Transflective LCD | Transmissive LCD |
|---|---|---|---|---|
| Direct sunlight | Improves with light | Readable | Reflective path holds | Washes out |
| Backlight required | No | No | Night operation only | Always on |
| Typical panel power | Milliwatts | Milliwatts, static | Milliwatts to watts | Watts |
| Full-motion video | Yes | No | Yes | Yes |
| Colour | Full colour | Limited | Full colour | Full colour |
| Refresh | Panel rate | Hundreds of milliseconds, with ghosting | Panel rate | Panel rate |
| Readable in the dark | With a front light | With a front light | Yes, backlight | Yes |
| Operating range | −30 °C to +85 °C | Narrower, slows in the cold | −30 °C to +85 °C | Derated by backlight |
Typical behaviour for each technology class, not a specific part. Reflective LCD figures are for Stellar Displays modules; request the datasheet with its test conditions for the module you are evaluating.
Specify reflective LCD when
- The content includes video, live data or animation, such as a machine HMI, a navigation screen or advertising.
- Full colour is part of the product, not a nice-to-have.
- The enclosure is unconditioned and sees industrial temperatures.
- The refresh rate of e-paper would be visible to the user as lag or ghosting.
- You want a panel in the 5 to 43 inch range with standard LCD interfaces.
Specify e-paper when
- The image changes a few times a day at most, such as a shelf label, a timetable or a room sign.
- Monochrome or a small colour palette is enough.
- The device runs from a coin cell or harvested energy and must hold its image with the power off.
- The installation is indoors or in a climate the panel is rated for.
- A bistable image after power loss is a safety or compliance requirement.
Stellar Displays does not sell e-paper. We say so here because the wrong technology costs a programme more than a lost order costs us.
Why do they behave differently?
A reflective LCD modulates light
Ambient light passes through the cover lens and polariser, the liquid crystal rotates its polarisation per pixel, and a reflector behind the cell sends it back out. The cell switches as fast as any LCD, so video and full colour come for free. How reflective LCD works.
E-paper moves pigment
Charged pigment particles migrate inside microcapsules when a field is applied and stay where they are when it is removed. That is why the image survives power loss, and why every change takes a visible fraction of a second and leaves a ghost of the last frame.
Temperature changes the physics
Pigment moves through a fluid, so cold thickens the fluid and slows the update until it stops. Liquid crystal also slows in the cold, but reflective LCD modules are specified across an industrial range and have no backlight lifetime to derate in the heat. Displays at −30 °C to +85 °C.
Not sure which one your product needs?
Send the enclosure drawing, the ambient range and the power budget. An application engineer replies with a recommendation, including e-paper if that is the honest answer.