How to distinguish the front and back of the LED backlight?

  The segment code LCD screen customization is divided into fully transparent, semi-transparent, and reflective. The first two need to be used together with LED backlights, while the reflective screen does not need a backlight, and relies on reflected sunlight, natural light or lights to display, I have met several customers recently, all of them are using segment code LCD products for the first time. The same problem is that the backlight is installed backwards. The structure of the backlight is divided into light guide plate, reflective film, diffuser film, edge wrapping and lamp beads. The diffuser film spreads the light, and it can also be called a light homogenizing film. On the front side, the reflective film is on the bottom, and there is no difference between the two models. So how do you look at the front and back sides? It is relatively intuitive to look at the shading area where he puts the lamp beads. The shading area is also called the head mold. The black part of the head mold is the upper front part, and the head mold is longer than the liquid crystal. The black edge of the head mold and the The edges of the LCD are aligned. The picture below is a black head mold. Those who have not touched it can be taken as a warning. Do not install it backwards. If you install it backwards, the LCD screen will be very dark.