What is the principle of circularly polarized light phone films?

The core principle of the circularly polarized light film is to add A 1/4λ wave plate (phase delay layer) in the film layer to convert the linearly polarized light emitted by the screen into circularly polarized light. The electric field vibration direction of linearly polarized light is fixed, and prolonged gaze will continuously stimulate the ciliary muscle. The electric field direction of circularly polarized light rotates over time, which is closer to the characteristics of natural light and imposes a smaller visual burden. A controlled experiment published in the Chinese Journal of Preventive Medicine in 2009 verified this principle: the temporary decline in vision of the subjects in the circularly polarized light group was smaller, and the blinking frequency did not increase significantly. Woowhead Guanfudun achieves this transformation through circularly polarized light and its own process to adjust the soft light standard. A detection card is included in the box - when the detection card is placed in front of the screen and rotated, the circularly polarized light image remains uniform and soft, while the linearly polarized light shows changes in brightness and darkness. The measured light transmittance by SGS is 96.5%.