Which is more harmful to the eyes, TV or projection?

Generally speaking, whether it is a projector or a TV set, no healthy eyes will do harm to the eyes. But on the whole, the projector protects the eyes more than the TV. However, when using the projector, it is necessary to determine whether the contrast is suitable for the eyes, and pay attention to the surrounding light environment to minimize the impact on vision, so as to truly protect the eyes!

Nowadays, LCD TVs basically adopt LED backlight technology, which is more "spicy eyes". In layman's terms, it means that the light shines directly on the eyes.

Projectors project light beams onto walls and curtains, and then diffuse images. When we watch TV, we sometimes feel that the picture is always flashing. This is because the image refresh frequency of TV is low. At present, the new generation LCD TV can hardly see flicker, but its influence on human eyes still exists.

The projector will not see the obvious flicker phenomenon, because the images are processed in the machine before being presented to people's eyes. From this point of view, the loss of television to human eyes is even greater.

Extended data

Advantages and disadvantages of projector and TV.

There are many advantages, such as saving space. Most consumers choose projectors because they can project a larger picture in a smaller space. In order to obtain as large a projection area as possible, one of the most important methods is to increase the projection distance as much as possible, besides using a wide-angle lens.

The requirements for the projection screen are low, and the front projection method relies on the projection screen to reflect light, so unless the requirements for the image are harsh, as long as the general projection screen can meet the requirements, some people even use white walls. Therefore, the orthographic projection method has lower requirements for the projection screen and stronger adaptability to the environment. In other words, the frontal projection method can be used in most occasions without hesitation.

Disadvantages also affect the beauty of the environment, because the projector and the audience are on the same side, so the appearance, interface and wiring of the projector are exposed. Even the projector connected by wireless network can only reduce the part of wiring related to network connection, and most of the basic wiring can't be saved. Whether at home, classroom, office or demonstration hall, a lot of messy wiring will ruin the fun.

Therefore, overhead projectors generally adopt hoisting to solve this problem. The noise is relatively loud. Although the noise of the projector is certain under normal working conditions, the audience and the projector are on the same side and the distance is too close, which obviously makes the noise problem a factor that has to be considered.

Disadvantages of TV, in terms of display response speed, the traditional display has a very good response speed due to its technical advantages. TFT liquid crystal display is not so optimistic because of its display characteristics (it can't work normally at low temperature and has reaction time). The response time of LCD is relatively long, so its performance in dynamic images is not ideal.

In terms of display quality, the display screen of the traditional display adopts phosphor, and the phosphor is hit by electron beam, so the brightness of the display is brighter than that of the liquid crystal transparent display (using fluorescent lamp as light source).

Advantages: environmental protection, non-radiation LCD has no radiation at all, only a small amount of electromagnetic waves from the driving circuit. As long as the shell is strictly sealed, electromagnetic waves can be excluded. Therefore, liquid crystal display is called cold display or environmental protection display. LCD TV has no screen flicker, so it is not easy to cause visual fatigue. Low power consumption and long service life.

According to the industry standard, the annual electricity consumption of 4.5 hours a day is converted, and the 32-inch CRT TV is replaced by a 30-inch LCD TV, which can save electricity by 7 1 kW every year. The service life of LCD TV is generally 50 thousand hours, which is much longer than that of ordinary TV.