Liquid optically clear adhesive
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Liquid optically clear adhesive LOCA is liquid-based bonding technology used in touch panels and display devices to bind the cover lens, plastic, or other optical materials to the main sensor unit or each other. These adhesives improve optical characteristics and durability. LOCA also allows for thinner designs and new technologies, such as the use of silicone, improve the properties of liquid optically clear adhesive buy final product.
Optical bondingincluding LOCA and non-liquid Liquid optically clear adhesive buy tape, are used in a wide range of electronic equipment, especially those with touch panels. The adhesive bonds the touch panel to the main liquid crystal display, and also bonds any protective cover, such as the lens, to the touch panel. After application, the adhesive is cured onto the device through ultraviolet light UVheat, moisture, or a combination, depending on the manufacturer and specifications.
Major applications include capacitive touch panels, 3D televisions 3D TVand glass retarders. Optical bonding improves optical performance of displays. Optical bonding improves the contrast ratio by reducing the amount of reflected light, thus improving viewability. This is especially important in outdoor applications, where direct sunlight can decrease viewability.
Reflection from the glass, as well as the adhesive can degrade LCD viewability. Reflection is caused by an impedance mismatch between air and the glass. The reflection makes the white brighter, but dilutes black and other colors, which decreases contrast.
Besides the optical advantages, bonding a sheet of glass to the LCD also improves display durability. It can resist scratches, condensation, and has an improved operating temperature range. As touchpad devices become ubiquitous in consumer markets, this increased ruggedness becomes even more important. Also, reducing light loss due to reflection extends battery life, as the device can use less backlight.
LOCA is generally used in displays and touch panel applications. Application is expected to liquid optically clear adhesive buy as mobile devices, televisions, tablets, monitors and laptops migrate to touch interfaces.
Although there are many varied applications, Henkel divides the applications into three categories: Touch panel sensor assembly: To bond touch panel sensors that require two layers of ITO indium-tin-oxide coated glass. This type of bonding will eventually be replaced by direct bonding. To fill the air gap in touch panel sensors that use a cover lens such as clear plastic PMMA and the glass touch panel sensor. While traditional adhesive chemistry relies on acrylic-based liquid, new technologies include silicone.
Silicone provides new methods for curing the adhesive. The following table liquid optically clear adhesive buy the difference between acrylic and silicone in liquid optically clear adhesive buy and double curing processes.
The curing process and inherent low modulus of silicone LOCA also liquid optically clear adhesive buy reduce the amount of haze around the edges liquid optically clear adhesive buy large LCD screens. Typical workflows for LOCA include two types of equipment: Curing equipment usually includes UV curing lamps or spot cure systems. Major suppliers of LOCA generally offer both dispensing and curing equipment workflow solutions. From Wikipedia, the free encyclopedia.
Primary advantages of LOCA compared to other adhesives are its: Optical bonding for improved LCD outdoor viewability. Retrieved from " https: Views Read Edit View history. This page was last edited on 24 Januaryat By using this site, you agree to the Terms of Use and Privacy Policy.
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