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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 (UV), heat, moisture, or a combination, depending on the manufacturer and specifications.
Optical bonding is the use of an optical-grade adhesive to glue a glass to the top surface of a display. The main goal of optical bonding is to improve the display performance under outdoor environments. This method eliminates the air gap between the cover glass and the display. [2]
Screen protectors have been known to interfere with the operation of some touchscreens. [4] Also, an existing oleophobic coating of a touchscreen will be covered, although some tempered glass screen protectors come with their own oleophobic coating. On some devices, the thickness of screen protectors can affect the look and feel of the device.
Anisotropic conductive film (ACF) is an adhesive interconnect system that is commonly used in panel display manufacturing, including liquid crystal displays (LCD) and organic light-emitting diode (OLED) technology. In display manufacturing, ACF facilitates the electrical and mechanical connections between the driver electronics and substrates.
Pre-treatment can be used to modify surfaces in a targeted way and thus make them more adhesive. [3] In addition to coating the substrates with an adhesion promoter to enable good adhesion, surfaces can also be modified by various methods to prepare them for gluing. The most common surface pre-treatment methods are listed in the adjacent figure.
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After degreasing, a good test to determine cleanliness of the surface is to use a drop of water. If the drop spreads on the surface, a low contact angle and good wettability has been achieved, which indicates the surface is clean and ready for application of the adhesive. If the drop beads up or retains its shape, the degreasing process should ...
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