The Development Stage And Optical Eigenvalues Of Led Diffuser Are Explained in Detail

The development stag and optical eigenvalues of Led diffuser are explained in detail

Do you know the development stage and optical characteristic value of Led diffuser in detail?

1. The development stage of Led diffusion plate:

1. Add particles with diffusion effect to improve light source shading and obtain cost performance;

2. Improve the diffusion effect, improve the appearance performance, and improve the light transmittance;

3. Optimize optical properties, improve UV resistance, improve impact resistance, improve light efficiency, and meet light distribution requirements;

4. High temperature resistance, under the premise of maintaining high light transmittance, the haze value of the product is improved, which is suitable for use in close-range irradiation environments.

2. Optical eigenvalues of Led diffuser:

Generally, for the quality control of optical properties of transparent and translucent plastics such as plate, sheet, film, and tube, the indicators such as transmittance and haze are mainly evaluated by testing. Our country was proposed by the former Ministry of Chemical Industry of the People's Republic of my country, drafted by the former Ministry of Chemical Industry Chenguang Chemical Research Institute and other units, and issued by the State Administration of Standards. ". which are defined as follows:

  1. Light transmittance - the ratio of the luminous flux (Luminous Flux) passing through the sample to the luminous flux hitting the sample, expressed as a percentage.

  2. Haze—the ratio of the scattered luminous flux deviating from the incident light direction through the sample to the transmitted luminous flux, expressed as a percentage (for this method, only the scattered luminous flux deviating from the incident light direction by more than 2.5 degrees is used to calculate the haze) . The cloudy or cloudy appearance of the interior or surface of a transparent or translucent material due to light scattering. Expressed as a percentage of the ratio of the scattered luminous flux to the luminous flux transmitted through the material. It is an important parameter for the optical transparency of transparent or translucent materials.

3. Refractive index-----no matter how your transmittance or haze changes, it has already determined its optics in terms of quality (density). The higher the refractive index, the lower the transmittance, and has nothing to do with thickness Both light transmittance and haze are indicators to measure the transparency of materials, which are not necessarily applicable to diffusers. Generally speaking, there is an inverse relationship between light transmittance and haze, and vice versa.

The above is only the definition of transparent materials, because the domestic transparent plates were not transparent enough in the 1980s, and foreign norms were quoted. After all, in 1981, there was no country or region that made clear specifications for the definition of diffuser plates, even if By 2014, there is no formal specification. This term originally came from the direct-illuminated backlight module, so the diffuser plate cannot be fully explained by referring to the specification of the transparent plate, nor is it a standard formulated by my country, so it may not be applicable. In solid-state lighting, with the development of LED light source and LED lighting, its application presents a technical bottleneck. Because none of the domestic manufacturers have optical engineering experts, they are still in the processing stage.