Introduction to knowledge of brightening film (prism film, spotlight film)

In modern display technology, brightening film is a thin film material widely used to improve screen brightness and smooth light distribution. It enhances the light intensity of the backlight source through the principles of refraction and reflection of light, making the image brighter and clearer. This article will provide a detailed introduction to the working principle, classification, and role of brightening films in different application scenarios. The basic structure of the working principle brightening film includes multiple layers of optical coatings, which can achieve specific optical effects. When light passes through the brightening film, it undergoes a series of refraction and reflection processes, ultimately leading to more light being emitted from the front direction, reducing the energy loss of the backlight system. The following are the specific steps: incident light: First, the light from the backlight source is irradiated onto the brightening film. First refraction: Part of the light passes through the brightening film, while the other part is reflected back by the first layer of optical coating. Second refraction: After entering the brightening film again, this part of the light will deflect with the help of the second layer of optical coating, causing it to diffuse towards the observer’s angle. Third refraction: Finally, the light reflected twice will shoot out again from the other side of the brightening film, and they have been adjusted to the optimal angle to better illuminate the entire screen. This process effectively improves the brightness uniformity and viewing angle of the screen, while reducing the energy consumption of the backlight system. Classification and characteristics: According to different designs and technologies, brightening films can be divided into the following categories: 1 Prism sheet is the most common type of brightening film. Its surface usually has a small array of diamond prisms that can concentrate light within a narrow directional range, thereby increasing the brightness of the screen directly in front. The advantage of prism lenses is their simple structure and low cost, making them suitable for situations with low brightness requirements. 2. Brightness Enhancement Film (BEF) is a complex structural design that includes multiple reflective surfaces and a special diffusion layer. This design can not only improve the brightness in front of the screen, but also improve the brightness consistency under the side view angle. Therefore, spotlights are more suitable for devices that require higher brightness and better image quality. 3. Composite Brightness Enhanced (CBE) composite brightening film combines the characteristics of prism and spotlight, providing a better performance balance. It can significantly improve the overall brightness and contrast of the screen, while maintaining good color performance and a wide viewing angle. The main application areas of brightening films include consumer electronics products such as liquid crystal displays (LCDs), tablets, laptops, smartphones, and digital cameras. In addition, it also has certain application space in indoor lighting systems, projectors, head up displays (HUD) and other fields. With the continuous advancement of technology, brightening films may play an important role in more emerging technological fields in the future. As an important optical component, brightening film greatly affects the brightness and viewing experience of display devices. By selecting and using brightening films reasonably, the competitiveness of products can be effectively improved, meeting the needs of consumers for high-quality visual effects. With the development of technology, it is believed that the brightening film will have broader application prospects in the future.