The world's first mass production three-particle electrophoretic display has been launched. E Ink Spectra TM displays utilize black, white and red engineered particles in a colorless solvent to achieve red plus black/white independent optical states without a color filter array. The three types of particles have different properties and are well controlled so they respond differently to various electric fields. The Spectra electrophoretic ink is filled and then sealed in a thin film Microcup® structure using a roll to roll process and the output imaging film can be easily cut to any shape and size and then laminated to TFT or segmented backplanes to form display modules.
A four‐particle electrophoretic display (EPD), Spectra™ 3100, was released in 2021. It targets electronic shelf label applications and signage applications by providing four primary optical states of black, white, red, and yellow, as well as dithering capability to show graphic images. Specially engineered black, white, red, and yellow particles in the electrophoretic ink respond to different electric fields to show pigment intrinsic colors on the display. The imaging film produced from this technology can reach a typical contrast ratio of 30:1 while maintaining a maximum driving voltage of ±15 V. The vibrant red and yellow colors are ideal for highlighting. Consistent optical performances are achieved for all four optical states across the operating temperature range of 0°C to 40°C for a typical indoor environment. The electrophoretic ink is coated and sealed in a thin‐film Microcup® structure using an additive and high yield roll‐to‐roll manufacturing process to produce the imaging film. Active matrix (AM) module integration follows the conventional EPD module production process of lamination between the imaging film and thin‐film transistor (TFT) backplane.
Following the commercial success of the three‐particle electrophoretic display E Ink Spectra� 3000, a four‐particle electrophoretic display, Spectra� 3100, was developed and launched as a premier product in 2021. It targets electronic shelf label applications and signage applications by providing vibrant optical states of black, white, red, yellow and dithering capability. Specially engineered black, white, red and yellow particles in the electrophoretic ink respond to different electric fields to show their intrinsic colors on the display. For the best readability under various light conditions, angles and distances, Spectra� 3100 imaging film can reach a typical contrast ratio of 30 while maintaining a maximum driving voltage of 15V. The ink is coated and sealed in a thin film Microcup� structure using an additive and high yield roll‐to‐roll process.
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