How to Choose the Right Diffuser Sheet for Your Project

When it comes to diffused light, there are many factors to consider. The most important question is: What type of effect do you want to create? Once you've answered that question, the next step is to choose the right diffuser for your project.

Principle of the diffuser sheet

A diffuser sheet is a sheet of material that is used to diffract or scatter, light. The plate is usually made of glass or plastic, and it has a surface that is covered with tiny bumps or ridges. These bumps cause the light to bounce in different directions, which makes the light appear to be diffused, or scattered. The diffusion plate is often used in conjunction with a light source, such as a light bulb, to create a more even distribution of light. For example, if you were to place a diffusion plate over a light bulb, the light would be scattered in all directions, rather than just going straight up and down. This would result in a more even distribution of light, which would make it easier to see things in the room. In addition to its uses in lighting, the diffusion plate can also be used in photography and microscopy. By placing a diffusion plate over the lens of a camera or microscope, you can create an image that is less sharp and more scattered. This can be useful for taking pictures of objects that are very small, or for taking pictures of objects that are very far away.

A diffuser sheet is used to interfere with the propagation of light, regardless of the original design of the light distribution curve how many degrees, as long as the diffusion plate will make the beam angle 160 ~ 176 °.

The larger the beam angle, the lower the illumination, some will also produce a filtering effect - so that some of the wavelengths can not penetrate, resulting in color deviation, such as in the surface of the light interference treatment again (for example sanding, betting pattern), the light transmission rate will be lower due to the natural phenomenon of geometric optics.

The main role of the diffuser sheet

(1) In order to break up the light flux and ensure that it is evenly distributed, a composite diffuser sheet is used. This not only helps to make the light uniform but also allows for control over the angle of emission.

(2) The backlight architecture is supported by the diffusion plate, and it also protects the optical material below from damage. This ensures that the entire system is stable and reliable.

The preparation process of the diffuser sheet

Extrusion molding and roller embossing composite technology, extrusion rolling method using an extruder to manufacture PC sheet, while the PC sheet can add different kinds of light diffusion particles, the preparation of different effects of the light diffusion plate, while the use of this technology can be light diffusion effect of microstructure embossed into the PC sheet, to achieve the combination of light diffusion particles and microstructure, the specific structure diagram is shown below, the current equipment costs are high, while there are limitations for the thickness of the extrusion molding sheet.

Thermal imprinting is a technique to prepare optical diffusion microstructures. Thermal imprinting is a method to prepare microstructures on the surface of a mold, and then transfer the microstructures on that surface to the surface of a polymer by imprinting to mold the desired microstructure. The polymer is generally a thermoplastic material, and the temperature has a relatively large influence on the molding of the structure, while the replication of the structure has a greater impact. The specific schematic diagram is shown below：

Therefore, the lower the refractive index of the substrate used to make the diffusion plate, the lower the interference with light will be.