Why LED backlight light guide plate laser dotting will replace silk screen light guide plate?

The backlight module is the provider of the light source of the liquid crystal display screen. The LCD itself does not emit light. The performance of the light source of the backlight module determines the visual sense of the display. The light guide plate is the transmission medium of the light source of the backlight module. Its dot arrangement, shape and material composition determine the performance of the brightness, distribution uniformity and light output efficiency of the outgoing light source. The light guide plate is the key to the LED backlight module. components. Determines the luminous efficiency and luminous uniformity.

LED backlight source, the main component is light guide plate, also called light-emitting plate, it is composed of acrylic (PMMA) or PC, or PS material, its manufacturing methods are as follows?

1. Laser Dotting

The so-called laser spotting is to use a laser spotting machine. The physical principle is usually to install high-brightness LED lamp beads on the side of a high-transparency acrylic sheet with a certain thickness, and light such as LEDs is folded and propagated inside the acrylic sheet at a certain divergence angle. When the light irradiates on the laser dots distributed on the back of the acrylic and etched with CO2 (carbon dioxide) laser, it will produce diffuse reflection and refraction, so that the light can be evenly distributed on the light guide plate. Its advantages are: good effect, long use time, simple process

  Second, open mold light guide plate

  The so-called open-mould light guide plate is a light guide plate with bumps formed by injection molding with a pre-designed mold by an injection molding machine.

  Three, silk screen light guide plate

 The so-called screen printing light guide plate is through the screen printing machine, adding ink and screen printing screen frame, screen printing on the acrylic surface to form dot-shaped ink dots.

  Analysis of the reasons why the laser spotting of the light guide plate will gradually replace the silk-screened light guide plate?

  Nowadays, more and more light guide plate manufacturers choose to use laser dots to make light guide plates. Why?

  First, the process of silk-screening the light guide plate is complicated. The acrylic sheet needs to be printed on the screen and ink, and then dried through the screen printing tunnel furnace to become the dot light guide plate. Among them, the production time period of the stencil is relatively long, usually takes a week, and each link requires manual operation.

  Second, environmental pollution is large. The production of silk-screen light guide plates requires ink, but ink is the biggest source of pollution in the printing industry. Because it is an organic volatile compound, it will form oxides and photochemical smog under sunlight, and the smell is particularly strong and pungent. Long-term operation may affect people's health.

  Third, it is easy to yellow and has a short lifespan. Since the heat generated by the LED during the lighting process will affect the ink, the ink dots will affect the emission of light, resulting in the phenomenon of light decay, which will eventually lead to uneven light or yellowing of the LED panel light, and the use time is not long.

  To sum up, the advantages of using the light guide plate laser marking machine for marking are gradually emerging, and more and more people use the light guide plate laser marking machine to make the light guide plate!