As the name suggests, the most important function of the light guide plate is to guide the light to the direction the designer needs, and all the design of the light guide plate is to cooperate with the needs of downstream LCD and backlight module, the most important is to achieve brightness and uniformity. Classification of light guide plate
Generally speaking, there are different classifications for the light guide plate due to its shape, production method and function, and there is no unified classification method at present. After finishing, the light guide plate is divided into: 1. Wedge plate: from the point of view into the light is thick on one side and thin into a wedge (triangle) shape.
2, according to the dot production mode: printing and non-printing
Printing: after finishing the appearance processing of the light guide plate, the dot is printed on the reflection surface in the printing way, which is divided into IR and UV.
Non-printing: the dot is formed directly on the reflective surface when the light guide plate is formed. It is also divided into Etching, v-cut, Stamper and internal diffusion.
3. According to the light input mode: side light (lamp tube and LED) and straight down type. Side entry: place the illuminator (lamp tube or LED) on the side of the light guide plate. Straight down: place the light source (lamp tube or LED) under the light guide plate.
4. According to the production method of forming: injection molding and cutting molding.
Injection molding: using the injection molding machine, the optical PMMA particles are injected into the mold at high temperature and pressure to cool and form. Light guide plate manufacturing process
Before understanding the processing process, you should first understand the parts required for the light guide plate
1. Required parts and tools
A. Injection molding: optical PMMA particles, ink b. Cutting: optical PMMA plate, ink
2. Optically grade PMMA particles and plates:
No matter how the light guide plate is produced, its most important and original material is optical PMMA (POLYMETHYL METHACRYLATE)
PMMA particles and PMMA plate PMMA by petroleum monomer (MMA) and the monomer (MMA) after chemical processing to make optical PMMA particles (beginning with can provide Injection molding), and optical PMMA particles with die Casting method (Casting) or delivery method to make the optical PMMA plate (Injection), the industry by PMMA manufacturers are as follows: (Japan) Mitsubishi Rayon, Sumitomo, Asahicasei, Kuraray, qimai, Sehwa,
3. Ink: divided into UV and IR
4, plate cutting light guide plate production method for three parts: the first is the shape of acrylic plate processing; The second is the network plate production; The third is printing, the process flow is respectively
A. Acrylic contour machining = original plate cutting > mirror planing > forming processing.
B. Mesh board production = dot design > negative output > mesh
C. Printing = acrylic washing > printing > baking (IR) or UV irradiation (UV)
Guide plate is divided into 5, injection forming printing type and the printing type two kinds, its basically the same process, for the printing type at the time of casting mould and no at casting shoots in the branch, so the injection of the finished product is the force that press a gram appearance, after being formed through printed guide plate, rather than the type of printing is to design a good site casting in the mold, and node is made at the time of injection molding of light guide plate at the same time to complete.
What is a light guide column
A light guide column is a device that transfers light from a source to another point at a certain distance from that source with minimal loss. Light is transmitted within the light guide column by total internal reflection.
Light guide columns are usually made of optical materials, such as acrylic resin, polycarbonate, epoxy resin and glass.
The light guide column can be used to transmit the LED light on the PCB to the product panel to display the relevant status. It can also be used to gather and guide the light to be used as the backlight of the LCD display screen. It can also be used to illuminate the pattern on the through window. (1) in principle, materials with high light transmittance should be selected AS far AS possible for suitable light guide column materials. AS can be seen from the following table 1, the light transmittance of transparent ABS, AS and PC is the same, and the influence on remote control distance and Angle is not different. The result of experiment A also verifies this conclusion. In the characteristics of injection molding,AS is easy to stick to the mold, brittle, if you choose this material, you should pay attention to the mold Angle and ejection position. At present, most of the light guide columns used by our company are PMMA materials with better performance.