Characteristics Definition: OCA (Optically Clear Adhesive) is an optical transparent double-sided tape without a substrate, made of optical-grade acrylic adhesive, which enhances the display effect by eliminating air gaps. Its core features include: High light transmittance (usually ≥90%, such as 91.4% for TOMOEGAWA products) and low haze (≤1%, some models as low as 0.4%) ensure clear display without glare. Strong adhesive force (for example, the adhesive force of 3M products reaches 54N/100mm), weather resistance (high temperature resistance up to 177℃, moisture resistance, UV resistance), suitable for extreme environments. Substrate-free design: Adjustable thickness (from a few microns to hundreds of microns), achieving ultra-thin bonding and reducing light reflection loss.
Application scenarios Consumer electronics: The touch screens and display modules of smart phones, tablet computers, smartwatches, and VR/AR devices are integrated to eliminate the air layer and enhance touch sensitivity and display effect. In-vehicle display: High-temperature and high-humidity resistant bonding of automotive central control screens, instrument panels, and HUDs (head-up displays), meeting the reliability requirements of in-vehicle environments (such as 85℃/85%RH durability tests). Industrial and special equipment: Optical bonding of aviation/military display devices, medical displays, industrial control panels, and interlayer fixation of OLED/LCD displays. Emerging fields: Bending and bonding of flexible screens and foldable screens (requiring high flexibility OCA), as well as precise assembly of camera modules and optical instruments.
