Liquid crystal is a substance between solid and liquid. It cannot emit light by itself and requires additional light sources. Therefore, the number of lamps is related to the brightness of the liquid crystal display module.
The earliest liquid crystal displays had only two upper and lower lamps. Up to now, the lowest-level of the popular type has four lamps, and the high-end one has six lamps. The four-lamp design is divided into three types of placement: one is that there is a lamp on each of the four sides, but the disadvantage is that there will be dark shadows in the middle. The solution is to arrange the four lamps in parallel from top to bottom. The last one is the "U"-shaped placement form, which is actually two tubes produced by two lamps in disguise. The six-lamp design actually uses three lamps. The manufacturer bends all three lamps into a "U" shape, and then places them in parallel to achieve the effect of six lamps.
The viewing angle of the liquid crystal display module is a headache. When the backlight source passes through the polarizer, the liquid crystal and the orientation layer, the output light becomes directional. In other words, most of the light is emitted vertically from the screen, so when viewing the LCD from a larger angle, the original color cannot be seen, and even there will only be the entire white or all black.