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The function between the LED diffuser and the light guide plate

2019-12-16

The function and function of the LED diffuser and the light guide are completely different between them.


Distinguish from material:


The common substrate for diffusion plates is PC (polycarbonate)

The diffuser mainly breaks through the luminous flux and distributes the light evenly. The main principle is that it penetrates through other media to cause scattering. The diffuser has a unique advantage that there are three physical phenomena. Due to the surface frosting treatment of the diffuser plate, the visual effect is high-grade, beautiful, wear-resistant, scratch-resistant, stable, UV-resistant, weather-resistant, and can be used for a long time under 80 degrees Celsius, so it is popular among the public.


The common substrate for the light guide plate is PMMA (acrylic)

The light guide plate is an acrylic material in the optical material. It is a high-factor material with extremely high reflectivity and no light absorption. The light emitted from the acrylic plate using the optical grade is carried out on the surface of the optical grade plate. When the light is reflected to the point of each light guide, the reflected light will diffuse in all directions, and then the reflection condition is destroyed. After the multi-layer reflection, various dense and uniform shapes are formed, and then The LED light guide plate can emit uniform light, and the reflective sheet is mainly used for placing the bottom surface to improve the efficiency of light use.


From functional distinction:


The main role of the diffuser:


1 astigmatism flux, let the light evenly distributed (partial composite diffuser can control the exit angle in addition to homogenizing the light)


2 support backlight structure to protect the underlying optical material from damage


The main role of the light guide:


1 Guide the LED point source light flux evenly distributed throughout the plane. His key role is to guide the distribution of light.


2 using the reflection mechanism to more efficiently use the luminous flux and control the light distribution.


Application scope distinction:


1 Light guide plate (PMMA Acrylic) is suitable for LED lighting fixtures with direct light source, such as grille lamps and high-grade aluminum lamps.


2 diffuser (PC polycarbonate) is suitable for side-light LED lighting fixtures, such as flat panel lights, professional viewing lamps, usually used with light guides, mainly used for low-grade ordinary LED lights.

Pls check here for more TV backlight parts.: https://www.indasina.com/tv-backlight-solutions_c2

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