Why does the anti-blue light film turn yellow?

Many friends have reported that the mobile phone is a little yellow after the anti-blue light film is attached, but this is normal. The anti-blue film itself is an optical material. Before understanding why the anti-blue film turns yellow, it is necessary to popularize a concept in optics-complementary colors.

Why does the anti-blue light film turn yellow?

The color of a substance is related to the absorption, transmission, and reflection of light. Depending on the nature and form of the substance, the absorption, transmission and reflection of light are also different, and the substance exhibits different colors. The substance selectively absorbs a certain kind of white light. When light of a wavelength, it presents the complementary color, that is, the color that people perceive with the naked eye. Therefore, in optics, when two colors of light are mixed in an appropriate ratio to produce a white feeling, the two colors are called “complementary colors.” For example, the same amount of red light + green light = yellow light, which is complementary to blue light.

Therefore, it is not difficult to understand why the anti-blue light film turns yellow. There are two explanations as follows:

Explanation 1: According to the principle of material color development, the anti-blue light film absorbs blue light, so it presents its complementary color-yellow

Explanation 2: According to the color rendering principle of RGB, blue light is blocked, red light and green light are transmitted, and the mixture of red and green appears yellow.

The yellowing of the anti-blue light film is only on a white background, but it looks blue on a black background? According to the color rendering principle of objects: objects that can absorb all light are black, and objects that can reflect all light are white. When the anti-blue film is on a white background, the film presents the transmitted light as yellow; when the anti-blue film is on a black background, the film presents the reflected light as blue light.


Post time: Aug-26-2021