BMW body surface with real color change thanks to electrophoretic technology has a potential for future interior and exterior applications.
The fluid color changes are made possible by a specially developed body wrap that is tailored precisely to the contours of the all-electric Sports Activity Vehicle from BMW. When stimulated by electrical signals, the electrophoretic technology brings different color pigments to the surface, causing the body skin to take on the desired coloration.
Electrophoretic coloring is based on a technology developed by E ink that is most well known from the displays used in e Readers. The surface coating of the BMW iX Flow featuring E ink contains many millions of microcapsules, with a diameter equivalent to the thickness of a human hair. Each of these microcapsules contains negatively charged white pigments and positively charged black pigments. Depending on the chosen setting, stimulation by means of an electrical field causes either the white or the black pigments to collect at the surface of the microcapsule, giving the car body the desired shade.
Achieving this effect on a vehicle body involves the application of many precisely fitted ePaper segments. Generative design processes are implemented to ensure the segments reflect the characteristic contours of the vehicle and the resulting variations in light and shadow. The generative design algorithms enable the necessary formability and flexibility required to tailor the e Paper exactly to the design lines of the vehicle.
Laser cutting technologies guarantee high precision in generating each segment. After the segments are applied and the power supply far stimulating the electrical field is connected, the entire body is warmed and sealed to guarantee optimum and uniform colour reproduction during every color change.
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