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What is electrophoresis technology? Literally means "swimming at a certain voltage", and the display works by moving electric ions immersed in a transparent or colored liquid, that is, by flipping or flowing fine particles to brighten or darken pixels , and can be fabricated on glass, metal or plastic substrates. The specific technique is that titanium dioxide particles with a diameter of about 1mm are dispersed in hydrocarbon oil, black dye, surfactant and charge control agent to charge the particles are also added to the hydrocarbon oil; this mixture is placed in two blocks Between parallel conductive plates with a distance of 10-100 mm, when a voltage is applied to the two conductive plates, these particles will migrate from the thin plate where they are to the oppositely charged thin plate in an electrophoretic manner. When the particles are on the front (display side) of the display, the display is white because light is scattered back to the reader by the titanium dioxide particles; when the particles are on the back of the display, the display is black because the color dyes absorb the incoming light . An image can be formed by dividing the electrodes on the back into tiny picture elements (pixels) by applying the appropriate voltage to each area of the display to create a pattern of reflective and absorbing regions. Electrophoresis has several advantages. One is low energy consumption. Thanks to the bistability, the image remains on the display for days or months after the power is turned off. Second, the displays produced by electrophoretic technology are reflective, so they have good sunlight readability, and can also be combined with front or side light for use in dark environments. The third is the potential for low production costs, as the technology does not require strict packaging and is feasible with solution processing techniques such as printing. Fourth, electrophoretic displays feature flexible form factors, allowing them to be fabricated on plastic, metal or glass surfaces, so it is the best choice for flexible display technology.

Electrophoresis display 2021-11-24

Technical advantages 2021-11-24

light and thin The thickness of E-ink display devices is usually very small, the weight is also quite light, but the structure is more durable than ordinary LCD. Can these advantages make it not favored by those portable device manufacturers? Traditional LCD devices are limited in terms of structure. Its thickness cannot be too thin (if the thickness of the two layers of glass of the LCD screen is 0.7mm, and the thickness of the two layers of substrates is 0.5mm thick, then the thickness of the LCD screen will not be less than 2mm), The weight can't be too light either. The hardware structure of the electronic ink display device is quite simple, its thickness can be about 1mm, and the thickness of the display screen is less than half of that of the LCD. In addition, e-ink has a wide range of applications. It can be used not only on glass surfaces, but also on surfaces such as plastics, so it will not be as fragile as LCD displays. A comparison of thicknesses of TFT LCD displays, first-generation e-ink displays, and future e-ink displays is shown. Low power consumption The power consumption of e-ink is quite low, and it can display a picture even when the power supply is briefly stopped. The reason for its very low power consumption is that its reflectivity and contrast are very high, and there is no need for backlighting to improve readability. To sum up, the display device using e-ink technology will have the same visual characteristics as paper media, but also have the advantages of low power consumption, thin thickness and light weight, making it a new favorite of portable devices, especially for those who require These are applications where transmissive LCDs and reflective LCDs cannot meet the requirements of better display effects under all kinds of light. Simple process The electronic ink display device can follow the production equipment of AMLCD, and the production process is simpler. Just apply the electronic ink to the IT0 plastic substrate, and then use the Laminator process to attach it to the TFT backplane. This process is the same as the polarizing film attachment method in the LCD production process, and this process can be used Existing equipment or similar equipment for production. The simplification of the production process means higher yields and higher yields, coupled with a reduction in substrate thickness, which results in significant cost reductions (still more expensive than paper, of course).

readability 2021-11-24

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