E Ink Introduces Kaleido 4 Color E-Paper with Improved Color and Refresh Rates

E Ink Unveils Kaleido 4 Display Technology

E Ink has released Kaleido 4, the newest iteration of its color e-paper display technology. This update brings significant improvements aimed at enhancing the user experience for color e-readers and writing tablets. The company states that Kaleido 4 can produce a wider array of colors and offers better refresh rates compared to previous versions.

Enhanced Color Reproduction and Performance

Kaleido 4 features a doubled color gamut volume, allowing it to display over 40,000 colors. E Ink also reports improvements in white reflectance and contrast. A notable advancement is the increased refresh rate, which now supports video content at 18 frames per second. While this is lower than modern smartphone displays, it represents a meaningful improvement for e-paper technology, which is typically characterized by slow refresh rates.

Addressing E-Paper Limitations

The improvements in Kaleido 4 aim to mitigate common drawbacks of color e-paper, such as the relative fuzziness of text on older Kaleido 3 displays. By applying a color filter to black and white pigments, Kaleido displays offer color without the slower refresh times of Gallery displays, which use colored pigments. The addition of an oxide backplate to the display stack contributes to the improved refresh rates.

Industry Impact and Availability

Given that major e-reader manufacturers like Amazon, Kobo, and Boox utilize E Ink screens, the advancements in Kaleido 4 could lead to e-readers with more accurate color images and improved text clarity. Currently, Kaleido 4 is officially integrated into one device: Hanvon Technology's M10 C II e-paper tablet, which is available exclusively in China. This device also includes a redesigned front light and micro-etched glass for a paper-like writing feel.