Today, I will share with you the glue solution for LED backlight lens bonding

Traditional fluorescent lamps use mercury vapor as the light source, which has poor color reproduction and contains mercury vapor that is harmful to the human body. Nowadays, with the development of science and technology, LED back lights are gradually replaced. The LED backlight has good color reproduction, long life, no mercury, is conducive to environmental protection, and can work at low voltage, with fast response speed and convenient control.

According to the position of the light source, the LED backlight is divided into direct-type LED backlight and edge-lit LED backlight. The direct-type LED backlight directly places the LED light source under the light-emitting surface. The light emitted by the LED backlight passes through a certain spatial distance and is diffused and mixed by the diffuser, and then becomes a surface light source and is emitted. The direct-type LED backlight needs to be a certain mixing distance. The edge-lit LED backlight structure is more advantageous for the ultra-thin module design. Research hotspots of upstream companies.

The whole structure of LED back light includes: LED light bar, driver board, film material, light guide plate, heat sink, upper frame, back plate, lens, etc. Among them, the use of adhesive to bond and fix the LED backlight and the lens has become an important process in the production process.

The LED back light strip is generally a long strip substrate, and the materials include: FR-4, metal, ceramic, alloy, etc., and a specific patch position is marked on the substrate, generally including 3-4 dispensing positions.

The lens is also known as LENS. The material includes: PC, glass, PMMA, silica gel, etc. There are 3 or 4 pins corresponding to the dispensing position on the light bar, usually the size is about φ2cm, and the pin height is about 1mm.

At present, the common method of fixing the LENS and the light bar is to use a glue dispenser to dispense glue on the glue point of the light bar. Put it in the corresponding position, insert the pins into the glue, make the glue completely cover the pins of the lens, and then cure the glue.

1. Recommended glue point for LED back light strip lens bonding

According to the different processes of customers, there are two main types of LED backlight glue: epoxy resin structural glue and UV curing glue.

1. TSE1902B one-component epoxy adhesive:

High viscosity, strong adhesion, good storage, can be cured at 75 ° C, no dust after curing.

2. TSE1408 UV curing adhesive:

High viscosity, high strength, good toughness, impact resistance, suitable for bonding between LENS and substrate.