The production method of Led light guide plate

The most important thing for LCD and backlight modules is to achieve brightness and uniformity. Light guide plate classification

Generally speaking, the light guide plate has different classification methods due to its shape, production method and function, and there is no unified division method at present. After finishing: 1. According to the shape, it is divided into: flat plate and wedge plate (slant plate). The light guide plate is rectangular in view of the light entrance. Wedge plate: viewed from the light entrance, the side is thick and the side is thin and wedge-shaped (triangle).

2, according to the production method of outlets: printed and non-printed

Printed type: After the shape of the light guide plate is finished, the dots are printed on the reflective surface by printing, and are divided into IR and UV.

Non-printing type: The dot is directly formed on the reflecting surface when the light guide plate is formed. It is divided into chemical etching (Etching), precision mechanical characterization (V-cut), light lithography (Stamper), and internal diffusion.

3, according to the way of entering the light: side light (lamp and LED) and direct type. Side entry light: Place the illuminator (lamp or LED) on the side of the light guide. Direct type: Place the illuminator (lamp or LED) under the light guide.

4. According to the forming method: injection molding and cutting forming.

Injection molding: The optical grade PMMA particles are injected into the mold by high-temperature and high-pressure injection molding using an injection molding machine. Cutting and forming: The optical grade PMMA original board is subjected to a cutting process to complete the finished product. Light guide manufacturing process

Before you understand the process, you should understand the parts required for the light guide.

1. Required parts and tools

a. Injection molding: optical grade PMMA particles, ink b. Cutting: optical grade PMMA flat, ink

2, optical grade PMMA particles, flat:

The most important and original material of the light guide plate produced by any production method is optical grade PMMA (POLYMETHYL METHACRYLATE). Polymethacrylate is also known as acrylic or plexiglass.

PMMA particles and PMMA plate PMMA are made from petroleum refining monomer (MMA) and then monomer (MMA) is chemically processed to make optical grade PMMA particles (which can be used for injection molding), and then optical grade PMMA particles. Casting method (Casting) or extrusion method (Injection) to produce optical grade PMMA flat panel, the PMMA manufacturers currently recognized by the industry are as follows: (Japan) Mitsubishi Rayon Mitsubishi Rayon, (Japan) Sumitomo Chemical Sumitomo, (Japan) Asahi Kasei Asahicasei , (Japan) Kuraray Kuraray, (Taiwan) Chimei Chemical, (Korean) and Sehwa,

3, ink: divided into UV and IR

4, the flat cutting light guide plate production method is three parts: the first is the acrylic sheet shape processing; the second is the stencil production; the third is printing, the process flow is

a. Acrylic shape processing = original plate cutting > mirror planing > forming processing.

b. stencil production = dot design > film output > Zhang Net

c. Printing = Acrylic Washing > Printing > Baking (IR) or UV Light (UV)

5. The injection-forming light guide plate is divided into two types: print type and non-print type. The process is basically the same. When the mold is cast, the screen is not cast at the time of shooting, so the finished product is only acrylic. The shape is to be formed and then printed to complete the light guide plate. The non-printing type is to cast the designed dot on the mold, so that the dot and the light guide plate are simultaneously completed during injection molding.

Laser engraving

The laser engraving method is to strictly control the energy of the laser head and the position of the laser head according to the program requirements, and to vaporize the microstructure array with a certain size on the back side of the light guide plate. This method can be very precise. Control the depth of the scattering structure, but the efficiency is very low, which is not convenient for mass production.

The laser dot scheme has the following characteristics:

1. Combine different acrylic materials and different ways of using, it can adopt uniform and uniform laser dot layout, and can also make dot layouts with different sizes according to different specifications and ways of use. The perfect unity of commonality and specificity.

2, the light guide is more uniform, the formation can reach 90% or even more.

3, effectively use the dense reflection around the small dots, the "strand" function in the middle of the big point, there is no dark lines and "black holes". And can make special effects