What is COB LED backlight?

Backlight, or BL (Backlight), plays a vital role in modern display technology. This device does not simply provide light for the screen, but ensures that the image can be presented to the audience in the clearest and brightest way. The design of the backlight is exquisite and complex. It is usually located behind the display panel, which not only plays a role in lighting, but also provides a certain physical protection for the panel itself. In addition, the installation and maintenance of the backlight are usually achieved through a special locking structure, which allows users to operate it conveniently and quickly. In terms of the working principle of the backlight structure, side-emitting LEDs are one of its core components. These LEDs are designed very precisely to emit light of various required brightness and colors. Usually, they emit white light because this can adapt to a variety of different display needs.

The function of the Light Guide Plate (LGP) is equally important. It is responsible for converting the light from the side into a uniformly distributed surface light source. In this process, most of the light is effectively refracted to the front, and a small part is reused through the reflective film. This mechanism significantly improves the efficiency of light use. As light travels, it next encounters the lower diffuser (Diffuser). In this layer, the light is further dispersed to ensure an even distribution of light across the entire display plane. This avoids the problem of local over-brightness or over-darkness on the screen, thereby ensuring visual comfort and balance. In order to further enhance the effect of light, the backlight system also uses a lower brightness enhancement film (Brightness Enhancement Film Horizontal, BEF H). This special film uses prism focusing to intensify light horizontally or vertically, thus improving the overall brightness and clarity.

Finally, the light needs to go through another layer of processing, namely the Brightness Enhancement Film Vertical (BEF V). Similar to the lower brightness enhancement film, this film also uses prism focusing technology to further enhance the distribution of light in the vertical or horizontal direction. Through this fine light control, it ensures that the audience can get the best visual effect no matter from which angle they watch the display device. In short, the backlight source provides modern display devices with efficient, uniform and bright light sources through a series of complex optical components and intelligent design, which greatly enriches our visual experience.