Maybe when we watch television for a long time, the eyes will feel uncomfortable, dry and even painful. In fact, we often see the light of human eyes nothing more than: natural light and non-natural light two types. Natural light is very small to the human eye, and non-natural light is harmful to the human eye. Looking at it for a long time will certainly stimulate the human eye. In life, our common lighting, CRT, and sunlight are natural light, and the intensity of the light waves in all directions is also very similar. So what kind of light is the light emitted by LCD TV? Here we let us study it through experiments!
The test method is very simple: Place the CPL polarizer for the camera in front of the eye, and the polarizer to the side of the camera lens to get close to the eye. Look through the polarizer to the screen and slowly rotate the lens. If it is liquid crystal, when the lens is turned to a certain position, the screen is dark and the same as the shutdown.
CRT TVs, Plasma TVs can see the picture no matter how the lens turns, but the brightness changes slightly. The only LCD TV is not, there will be a dark place. This is because the polarized light from the TV coincides with the polarized light from the angle at which the lens in your hand blocks the transmission. The light is completely blocked.
The liquid crystal panel itself cannot emit light, and the lamp tube behind the screen is required to emit light, while the plasma and picture tube televisions are all active and do not need the light source behind. If you upgrade the polarized light of the lamp behind the LCD TV to natural light, it is certainly a great initiative, but the problem is how to change, because the brightness and darkness of the LCD screen is essentially controlling the amount of polarized light. Through the above experiments, we will find that polarized light emitted by LCD TVs is still harmful to our eyes.
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