Two years ago, E Ink announced the Spectra e-paper panels that feature three pigments - black, white and red. Today the company announced an expansion of that product line to include the Spectra Yellow, which can show black, white or yellow colors.

The Spectra panels are aimed for electronic shelf label (ESL) retail applications. E Ink says that red and yellow are two of the most widely used colors relevant to in-store displays and signage. Spectra panels support both active-matrix and segmented format displays.

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