cholesteric lcd display supplier

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Recognizing Cholesteric Liquid Crystal Displays (ChLCD) key attribute of “No Power” to maintain an image, Ebulent Technologies has been a supplier of this unique display technology from the beginning. No other company has more ChLCD design wins or manufacturing experience than us. No other company has shipped more segmented and graphic ChLCD modules than Ebulent Technologies Corp.

The cholesteric (or chiral nematic) liquid crystal phase is typically composed of nematic mesogenic molecules containing a chiral center which produces intermolecular forces that favor alignment between molecules at a slight angle to one another. This leads to the formation of a structure which can be visualized as a stack of very thin 2-D nematic-like layers with the director in each layer twisted with respect to those above and below. In this structure, the directors actually form in a continuous helical pattern about the layer normal. The black arrow in the animation represents director orientation in the succession of layers along the stack.

An important characteristic of the cholesteric mesophase is the pitch. The pitch, p, is defined as the distance it takes for the director to rotate one full turn in the helix as illustrated in the above animation. A byproduct of the helical structure of the chiral nematic phase, is its ability to selectively reflect light of wavelengths equal to the pitch length, so that a color will be reflected when the pitch is equal to the corresponding wavelength of light in the visible spectrum. The effect is based on the temperature dependence of the gradual change in director orientation between successive layers, which modifies the pitch length resulting in an alteration of the wavelength of reflected light according to the temperature. The angle at which the director changes can be made larger, and thus tighten the pitch, by increasing the temperature of the molecules, hence giving them more thermal energy. Similarly, decreasing the temperature of the molecules increases the pitch length of the chiral nematic liquid crystal. This makes it possible to build a liquid crystal thermometer that displays the temperature of its environment by the reflected color. Mixtures of various types of these liquid crystals are often used to create sensors with a wide variety of responses to temperature change. Such sensors are used for thermometers often in the form of heat sensitive films to detect flaws in circuit board connections, fluid flow patterns, condition of batteries, the presence of radiation, or in novelties such as "mood" rings.

The wavelength of the reflected light can also be controlled by adjusting the chemical composition, since cholesterics can either consist of exclusively chiral molecules or of nematic molecules with a chiral dopant dispersed throughout. In this case, the dopant concentration is used to adjust the chirality and thus the pitch.

A cholesteric liquid crystal display (ChLCD) is a display containing a liquid crystal with a helical structure and which is therefore chiral. Cholesteric liquid crystals are also known as chiral nematic liquid crystals.

KDI has world class manufacturing expertise in roll to roll manufacturing of liquid crystal films, face shield lenses, and other functional flexible materials in including the award winning flexible Boogie Board eWriter LCD films.

The eWriter works on the principle of anisotropic flow, a unique feature of cholesteric liquid crystals, in which crystals flow at different rates, depending on the direction of pressure being applied.

The global awareness of sustainable environmental protection has risen, making e-paper a popular fried chicken among “carbon reduction products”, attracting major manufacturers to compete, and panel manufacturer AUO (2409-TW) joined hands at the 2022 Touch Taiwan Smart Display Exhibition Iridescent Optoelectronics and TPV Technology (TPV) launched cholesteric liquid crystal display technology (CLCD), aiming at the application market of electronic paper, which also heralded the official entry of cholesteric liquid crystal technology into the first year of development.

Cholesterol liquid crystal technology is not a new technology. In the past, like electronic ink technology and other electronic technologies, it has not received much attention from the industry. The main reason is that the global awareness of environmental protection was not high at that time, and transmissive display technology was booming, which squeezed the market’s impact on reflection. The so-called reflective display technology, in simple terms, does not emit light by itself, and must reflect the display content through an additional light source, which can save power compared to ordinary displays.

AUO exhibited for the first time this year a 7.9-inch reflective display using cholesteric liquid crystal technology. The driving voltage can be interrupted during static display, and the screen can be displayed using ambient light without any backlight, which greatly reduces power consumption, and does not require the use of color filters and polarized lights. The reflectance and color saturation are better than those of commercially available color electronic paper, and it will be applied to the education market and outdoor public display in the future.

AUO’s 7.9-inch reflective display is jointly developed, designed and manufactured with Iridescent Optoelectronics and TPV Technology (TPV). Among them, Iridescent Optoelectronics masters cholesteric liquid crystal technology, AUO provides panel design, and TPV is responsible for back-end assembly. It is understood that, The product is expected to be mass-produced in the second half of the year and officially launched to the market in the second quarter of next year.

Compared with e-paper using e-ink on the market, cholesteric liquid crystal display technology has advantages in color performance, page changing speed, and no afterimage, and also highlights the characteristics of liquid crystal. However, AUO’s announcement to enter the e-paper market has also attracted attention from all walks of life. , General Manager of AUO Ke Furen said that the reflective technology has multiple application fields, including education, transportation, smart cities, etc., and will have multiple applications in the future. Cholesterol liquid crystal also has bistable characteristics, which is expected to save power, and the material is shared with liquid crystal. , the future supply elasticity is stable.

Cholesterol liquid crystal technology has been in existence for more than ten years, but there is still no actual product launched on the market. Iridescent technology, which holds related technology, can be described as a sword in ten years. After its establishment in 2012, it was originally intended to cooperate with Japan’s Fujitsu. , but with the withdrawal of Fuji Group, Iridescent Optoelectronics was silent for a long time, until 2018, the electronic paper technology once again attracted market attention, and it also made major display manufacturers find Iridescent Optoelectronics again.

After receiving capital injection, Iridescent Optoelectronics continued to develop cholesteric liquid crystals and accelerated the product development process with the assistance of major manufacturers. Iridescent Optoelectronics also participated in the 2022 Touch Taiwan for the first time this year. It is expected that this year will be the first year for the development of cholesteric liquid crystal technology. , Rainbow Optoelectronics also uses the characteristics of liquid crystal technology. In the future, it is expected to launch products that join solar panels (solar panels), so that the products can generate electricity by themselves, and further achieve the vision of sustainable environmental protection.

There are dozens of e-paper technologies. In recent years, the fastest-growing and most well-known in the market is the e-ink technology used by Yuantai. Although the color rendering is still relatively limited at this stage, it has changed from black and white to the present. Five-color electronic ink controls color, including e-book readers, ESL (electronic shelf label) applications are the main battlefield, and cholesteric liquid crystal has more advantages in color and page changing speed. In the future, the market is expected to focus on education and outdoor signage. Each has its own niche.

To create an LCD, you take two pieces ofpolarized glass. A special polymer that creates microscopic grooves in the surface is rubbed on the side of the glass that does not have the polarizing film on it. The grooves must be in the same direction as the polarizing film. You then add a coating of nematic liquid crystals to one of the filters. The grooves will cause the first layer of molecules to align with the filter"s orientation. Then add the second piece of glass with the polarizing film at a right angle to the first piece. Each successive layer of TN molecules will gradually twist until the uppermost layer is at a 90-degree angle to the bottom, matching the polarized glass filters.

If we apply an electric charge to liquid crystal molecules, they untwist. When they straighten out, they change the angle of the light passing through them so that it no longer matches the angle of the top polarizing filter. Consequently, no light can pass through that area of the LCD, which makes that area darker than the surrounding areas.

Building a simple LCD is easier than you think. Your start with the sandwich of glass and liquid crystals described above and add two transparent electrodes to it. For example, imagine that you want to create the simplest possible LCD with just a single rectangular electrode on it. The layers would look like this:

The LCD needed to do this job is very basic. It has a mirror (A) in back, which makes it reflective. Then, we add a piece of glass (B) with a polarizing film on the bottom side, and a common electrode plane (C) made of indium-tin oxide on top. A common electrode plane covers the entire area of the LCD. Above that is the layer of liquid crystal substance (D). Next comes another piece of glass (E) with an electrode in the shape of the rectangle on the bottom and, on top, another polarizing film (F), at a right angle to the first one.

The electrode is hooked up to a power source like a battery. When there is no current, light entering through the front of the LCD will simply hit the mirror and bounce right back out. But when the battery supplies current to the electrodes, the liquid crystals between the common-plane electrode and the electrode shaped like a rectangle untwist and block the light in that region from passing through. That makes the LCD show the rectangle as a black area.

A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers. Liquid crystals do not emit light directlybacklight or reflector to produce images in color or monochrome.seven-segment displays, as in a digital clock, are all good examples of devices with these displays. They use the same basic technology, except that arbitrary images are made from a matrix of small pixels, while other displays have larger elements. LCDs can either be normally on (positive) or off (negative), depending on the polarizer arrangement. For example, a character positive LCD with a backlight will have black lettering on a background that is the color of the backlight, and a character negative LCD will have a black background with the letters being of the same color as the backlight. Optical filters are added to white on blue LCDs to give them their characteristic appearance.

Glass substrate with ITO electrodes. The shapes of these electrodes will determine the shapes that will appear when the LCD is switched ON. Vertical ridges etched on the surface are smooth.

LCDs are used in a wide range of applications, including LCD televisions, computer monitors, instrument panels, aircraft cockpit displays, and indoor and outdoor signage. Small LCD screens are common in LCD projectors and portable consumer devices such as digital cameras, watches, digital clocks, calculators, and mobile telephones, including smartphones. LCD screens are also used on consumer electronics products such as DVD players, video game devices and clocks. LCD screens have replaced heavy, bulky cathode-ray tube (CRT) displays in nearly all applications. LCD screens are available in a wider range of screen sizes than CRT and plasma displays, with LCD screens available in sizes ranging from tiny digital watches to very large television receivers. LCDs are slowly being replaced by OLEDs, which can be easily made into different shapes, and have a lower response time, wider color gamut, virtually infinite color contrast and viewing angles, lower weight for a given display size and a slimmer profile (because OLEDs use a single glass or plastic panel whereas LCDs use two glass panels; the thickness of the panels increases with size but the increase is more noticeable on LCDs) and potentially lower power consumption (as the display is only "on" where needed and there is no backlight). OLEDs, however, are more expensive for a given display size due to the very expensive electroluminescent materials or phosphors that they use. Also due to the use of phosphors, OLEDs suffer from screen burn-in and there is currently no way to recycle OLED displays, whereas LCD panels can be recycled, although the technology required to recycle LCDs is not yet widespread. Attempts to maintain the competitiveness of LCDs are quantum dot displays, marketed as SUHD, QLED or Triluminos, which are displays with blue LED backlighting and a Quantum-dot enhancement film (QDEF) that converts part of the blue light into red and green, offering similar performance to an OLED display at a lower price, but the quantum dot layer that gives these displays their characteristics can not yet be recycled.

Since LCD screens do not use phosphors, they rarely suffer image burn-in when a static image is displayed on a screen for a long time, e.g., the table frame for an airline flight schedule on an indoor sign. LCDs are, however, susceptible to image persistence.battery-powered electronic equipment more efficiently than a CRT can be. By 2008, annual sales of televisions with LCD screens exceeded sales of CRT units worldwide, and the CRT became obsolete for most purposes.

As a leading manufacturer of small-to-medium-sized LCDs, Varitronix offers complete solutions for a wide range of applications, from automotive and telecommunications, to industrial and consumer applications. Headquartered in Hong Kong, we serve customers around the world through an extensive service network - striving to achieve excellence through innovation, quality, respect and integrity.

Established in 1978 by a group of academics, Varitronix was one of Asia"s pioneers of LCD manufacturing. Since then, we have combined rigid RandD, innovative product designs, flexible specifications and efficient production to provide the utmost in customer satisfaction.

Recognizing Cholesteric Liquid Crystal Displays (ChLCD) key attribute of “No Power” to maintain an image, Ebulent Technologies has been a supplier of this unique display technology from the beginning. No other company has more ChLCD design wins or manufacturing experience than us. No other company has shipped more segmented and graphic ChLCD modules than Ebulent Technologies Corp.

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