Application‑level segmentation isolates five dominant end‑use categories: packaging, display & touchscreen, automotive lighting, solar panels, and medical imaging. Packaging dominates the market, representing roughly 35 % of total revenue, because optical PET films provide barrier properties and visual appeal for food, beverage, and consumer‑goods containers. Display & touchscreen applications follow closely at 30 %, leveraging the films' high clarity and surface uniformity for LCD, OLED, and flexible display technologies. Automotive lighting, accounting for about 15 % of the market, utilizes antireflective and UV‑blocking variants to improve headlamp efficiency and interior illumination. Solar panel manufacturers consume approximately 10 % of optical PET films, primarily for encapsulation layers that require UV resistance and optical transmission. The remaining 10 % is attributed to medical imaging, where the films' low birefringence and sterilizability support diagnostic equipment housings. This application‑centric taxonomy clarifies revenue distribution and guides strategic investment across sectors.