TL;DR: LCD screens mix red, green, and blue light to make millions of colors. E-ink uses a few physical pigments plus dot patterns (dithering) to approximate color, which is why it shows fewer, softer shades and looks more like print. Different tool, not a worse one.
What's the real difference between e-ink and an LCD screen?
The core difference is how each screen makes color. An LCD (like your phone) creates color by mixing red, green, and blue light at every pixel, and each one can be dialed up or down smoothly, which is how it lands on millions of shades. An e-ink screen doesn't mix light at all. It uses physical pigment particles that are either there or not, so a 4-color panel works with a fixed set of colors and approximates the rest. One is a dimmer switch for light. The other is a box of four crayons. Neither is better, they're just built for different things.
How does an LCD screen make color?
Every pixel on an LCD is made of three tiny sub-pixels: red, green, and blue. Each sub-pixel can be adjusted to almost any brightness, like a volume knob that slides smoothly from off to full. Combine three knobs, each with 256 steps, and you get roughly 16 million possible colors per pixel. The screen itself doesn't glow. Behind the whole panel sits a bright backlight, and the liquid crystal layer acts like a set of shutters, deciding how much of that light passes through and in what color. So the backlight is the light source, and the smooth, continuous control over each sub-pixel is what actually produces all those colors. That continuous control is the key word.
How does e-ink make color instead?
E-ink works in a completely different way, and it doesn't use a backlight at all. Instead of glowing, it reflects light like a printed page, which is why it's easy on the eyes and readable in sunlight. Inside the screen are millions of microscopic capsules filled with charged pigment particles. Apply a small voltage and the right-colored particle floats to the surface. A 4-color panel has black, white, red/orange, and yellow particles, and that's the entire palette. There's no blue or green particle and no way to make a particle. A pixel either shows one of its pigments or it doesn't. That's the crucial limit: color on e-ink is discrete, not continuous.
Why does that mean fewer colors?
Because an LCD can fine-tune every pixel, it can produce a smooth gradient from one shade to the next. E-ink can't fine-tune a particle, so to suggest any color outside its four pigments, it arranges them in tiny patterns of dots. Your eye blends those dots from a distance into an approximate color, a technique called dithering. It's the same trick old newspaper comics and risograph prints use. A turquoise becomes a stipple of white and yellow. A deep blue, with no native particle to fall back on, often renders gray or flat. That dot pattern is exactly what gives e-ink images their soft, grainy character.
So which one is better?
It depends entirely on what you want the screen to do. An LCD is built for vivid, fast-changing, backlit content: video, games, bright photos at full saturation. E-ink is built for the opposite: a still image you glance at, that doesn't glow, that holds its picture without using power, and that feels like paper rather than a device. PicPak uses e-ink on purpose. The point was never to out-saturate a phone. It was to make photos that feel printed, calm, and a little nostalgic, the way a real photograph does. If you want to lean into that, our guide on what photos look best on PicPak walks through exactly which images shine and how to prep them.
The short version
LCD makes color by smoothly mixing red, green, and blue light, so it can show millions of shades. E-ink makes color with a small set of physical pigments and clever dot patterns, so it shows fewer, softer colors and reflects light instead of glowing. One isn't an upgrade of the other. They're two different tools, and the grain you see on e-ink isn't a flaw. It's the honest fingerprint of how the technology works.
