a. Direct type: means that the LED lights are evenly distributed on the back of the LCD screen, and the light penetrates directly through the panel; so the direct type is easier to achieve a well-defined light and dark effect, because it can adjust the on and off of some tail lights according to needs.
b. Side-firing type: means that the LED lights are distributed on the edge of the screen, and the light is evenly distributed on the screen through the light guide plate. For this reason, the side-firing LED TV can be made very thin, but because of the Poor lighting can cause uneven screen brightness.