Waveshare 4.01 inch ACeP 640×400 Pixel 7-Color E-Paper E-Ink Raw Display, without PCB

Features
1. Advanced Color ePaper (ACeP) technology, supports 7-Color display
2. No backlight, keeps displaying last content for a long time even when power down
3. Ultra low power consumption, basically power is only required for refreshing
4. Comes with development resources and manual (examples for Raspberry Pi/Jetson Nano/Arduino/STM32)

Advantages Of EINK
1. E-paper display utilizes microcapsule electrophoretic technology for displaying, the principle is: charged particles suspended in clear fluid will move to sides of microcapsule when electric field is applied, making the microcapsule become visible by reflecting ambient light, just as traditional printed paper.
2. E-paper display will clearly display images/texts under lamplight or natural light, requires no backlight, and features nearly up to 180 degrees viewing angle. It is usually used as e-reader due to its paper-like effect.

Specification
1. Operating voltage: 3.3V
2. Display color: ACeP 7-Color
3. Resolution: 640 x 400 pixels
4. Grey scale: 2
5. Interface: 3-wire SPI, 4-wire SPI
6. Standby current: Less than 0.01uA (almost none)
7. Refresh power: 50mW (typ.)
8. Full refresh time: 15s
9. Dimensions: 96.80 x 68.70mm
10. Display size: 66.9 x 29.06mm
11. Dot pitch: 0.135 x 0.135mm