How does Acrylic Light Guide sheet achieve uniform light guidance?
Acrylic light guide sheet is a key component for achieving uniform light guidance in modern lighting and display fields, and is widely used in many scenarios such as LCD displays, advertising light boxes, indoor lighting, etc. It mainly achieves efficient transmission and uniform distribution of light through material properties, structural design, and surface treatment techniques.
From a material perspective, acrylic itself has excellent optical properties. It has high transmittance, reaching about 92%, close to optical glass, which can minimize the loss of light during transmission. At the same time, acrylic material has good stability and is not easily yellowed or aged, ensuring that the light guide sheet maintains good light guiding performance throughout long-term use.
In terms of structural design, acrylic light guide sheets are usually flat, with light entry ports on the sides and light sources (such as LED light strips) installed on the sides. When light enters the light guide sheet from the side, it will continuously undergo total reflection inside the light guide sheet. Total reflection refers to the phenomenon in which light rays are completely reflected back to the original medium when the incident angle is greater than the critical angle when they are emitted from a dense medium to a sparse medium. The light guide sheet utilizes this principle to confine light within the board for transmission.
In order to evenly emit light from the surface of the light guide sheet, a series of microstructures are designed on the bottom of the light guide sheet, commonly known as dot structures. These dots are like tiny mirrors. When light propagates through the light guide sheet and encounters the dots, some of the light will be reflected, changing the direction of propagation and exiting the surface of the light guide sheet. The distribution density, size, and shape of the network points are not arbitrarily set, but are precisely calculated and designed. Near the light source, the density and size of the dots are small because the light intensity is high, and fewer dots can reflect an appropriate amount of light onto the surface; Away from the light source, the density and size of the dots gradually increase to enhance their ability to reflect light and ensure uniform light output on the entire surface of the light guide sheet.
In addition, surface treatment processes also play an important role in achieving uniform light guidance. The surface of the light guide sheet will be frosted or matte treated, which can scatter light when it exits the surface. Scattering disperses the concentrated light, avoiding situations where it is too bright or too dark locally, further enhancing the uniformity of light. At the same time, surface treatment can also reduce glare caused by light reflection and improve visual effects.
Through high-quality acrylic materials, clever structural design, and fine surface treatment, acrylic light guide sheets efficiently transmit and evenly distribute the light incident from the side to the entire surface, providing high-quality and uniform light sources for various lighting and display applications. They play an indispensable role in improving visual experience and optimizing product performance.