Scheme of an electrophoretic display using color filters. Electrophoretic displays are considered prime examples of the electronic paper category, because of their paper-like appearance and low power consumption.
Here we report the synthesis of an electrophoretic ink based on the microencapsulation of an electrophoretic dispersion.
When the particles are located at the front viewing side of the display, it appears white, because light is scattered back to the viewer by the high-index titania particles.
A dark-colored dye is also added to the oil, along with surfactants and charging agents that cause the particles to take on an electric charge. But such displays have to date suffered from short lifetimes and difficulty in manufacture.
The use of a microencapsulated electrophoretic medium solves the lifetime issues and permits the fabrication of a bistable electronic display solely by means of printing. In addition, the technology offers a unique path toward high-brightness full-color displays, leading to displays that are four times brighter than reflective LCDs and twice as bright as other emerging technologies.
If the rear electrode is divided into a number of small picture elements pixelsthen an image can be formed by applying the appropriate voltage to each region of the display to create a pattern of reflecting and absorbing regions.
One early version of electronic paper consists of a sheet of very small transparent capsules, each about 40 micrometers across. With no voltage applied, the colored oil forms a flat film between the water and a hydrophobic water-repellent insulating coating of an electrode, resulting in a colored pixel.
An electrophoretic display forms images by rearranging charged pigment particles with an applied electric field. Desired future improvements for this technology include bistability, cheaper materials and implementation with TFT arrays. When the particles are located at the rear side of the display, it appears dark, because the incident light is absorbed by the colored dye.
E ink subsequently formed a partnership with Philips Components two years later to develop and market the technology.
A more recent implementation of this concept requires only one layer of electrodes beneath the microcapsules. As a result, the display takes on color and brightness similar to that of conventional pigments printed on paper.
As a result, the stacked state is no longer stable, causing the water to move the oil aside. This system may satisfy the practical requirements of electronic paper.
Micro-particle-based displays possess intrinsic bistability, exhibit extremely low power d. Other bistable displays[ edit ].
SiPix is now part of E Ink.ePaper Displays. First designed to mimic the appearance of black ink on white paper, these electrophoretic display modules are sometimes referred to as EPD (Electronic Paper Displays), electronic ink, or mint-body.com: () Pervasive Displays (PDI, 龍亭新技) produces a wide range of standard and custom e-ink displays (EPD, epaper display) for industrial and commercial applications.
inch E-Paper Raw Screen Panel Resolution x V E-Ink Electronic Paper Display with Embedded Controller SPI Interface Support Partial Refresh for Raspberry Pi.
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