Contest details

The prism sheet is made from an acrylic sheet and has periodic grooves on its surface. When light is transmitted through a sheet of this shape, the light is refracted at a certain angle. Therefore, the angle of light can be changed.

Light can be diffused by changing the orientation of the sheet.

Also, when directional light is incident from the side where the groove is not dug, the light that exits the prism sheet comes out from various angles depending on the shape of the groove. Therefore, the light can be diffused by transmitting the sheet.

Usage of prism sheet

Prism sheets are used in mobile phones and displays

Prism sheets are used in mobile and television displays. A prism sheet is attached to the optical path of the backlight of the device to change the angle of light and increase diffusivity. By using a prism sheet, the backlight can be condensed to brighten the brightness of the display.

There is also a prism sheet that has two functions and reduces the number of stacked devices.

In addition, some prism sheets have both the two functions of high brightness and light diffusion. By using such a prism sheet, it is possible to reduce the number of stacked devices, which leads to cost reduction.

Features of prism sheet

Refraction and diffusion behavior change depending on the direction in which light enters the prism sheet.

The prism sheet is made from a thin acrylic sheet. Grooves of constant depth and shape are periodically dug on the surface of the prism sheet. Refraction of light occurs by transmitting light through a prism sheet with such a shape. When light is applied from the side with the groove of the prism, the light is transmitted at a constant refraction angle. On the other hand, if the groove of the prism is not dug and the light is applied from the flat side, the light will come out from the side with the groove at various angles. As a result, the light is diffused. In this way, the behavior of transmitted light changes greatly depending on the direction in which light enters the prism sheet, so it is necessary to check the direction of the sheet when using it.

When using the prism sheet, be careful of contact with organic solvents, scratches, and dirt.

Since the prism sheet is made of acrylic, it will swell and dissolve when it comes in contact with an organic solvent, and will lose its original function. Also, if the sheet is rubbed or rubbed, the shape of the groove may change or it may be scratched, causing unnecessary refraction or scattering of light. In addition, if you touch the surface of the sheet with your bare hands, the refraction behavior may change due to the sebum of your fingers.

Photographing with a prism sheet

The prism sheet has the effect of changing the angle of the light emitted from the light source and diffusing the light.
Here, we will introduce the application to photography as an interesting example of using the prism sheet, although it is different from the normal use. White light that has passed through a prism has a rainbow-like spectrum due to the wavelength dependence of the refractive index.
This is a phenomenon that I have seen in junior high school science textbooks, but it can also be used for photography.
Suppose you were taking portraits in the city at night. Of course, it is important to project the subject illuminated in the city clearly, but with some playfulness, I will place a prism sheet in front of the camera.
Then, the rainbow-like spectrum overlaps with the subject, and a fantastic picture is obtained. For those who like Hikarimono, you can easily take the best photo, which is very convenient.

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