7.5inch HD e-Paper E-Ink Raw Display, 880×528, Black / White, SPI, without PCBLow Power Consumption, Wide Viewing Angle, Paper Like Displaying Without Electricity Ideal for price tags, shelf labels, industrial instruments 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.