BladeW
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The coronavirus pandemic has made the phrase "healthy household appliances" popular and health has also become a commodity attribute of consumers' increasing concern. In addition to the disinfection of electrical appliances, consumers began to pay attention to eye care, after all, the time to watch the screen increased significantly in the house. For ultra-high definition large screen TV, "eye protection" or not is the focus of health appeal. Recently, the concepts of large screen, HD, 8K, OLED and laser TV are quite popular, so let's talk about whether laser TV can protect eyes or not.
Some consumers after buying laser TV Tucao said "laser TV looks gray," "only in the middle, there is no picture on the side of the screen, make complaints about eye protection?" Make complaints about mobile phone products, computer industry analyst Liu Buchen said that in recent years, the incidence rate of eye diseases in China has been significantly improved. Many people have such confusion: the mobile phone and computer will be dry and painful for a long time. The reason is that the short wave blue light emitted by the display will cause more short wavelength blue light emitted by the laser TV, so laser TV can easily cause eye fatigue. , bad for eyes.
"The harm of laser to human eyes is mainly reflected in two aspects. One is that direct vision laser may cause temporary blindness or permanent blindness. Because there is a distance between the laser emitted by the laser transmitter and the TV screen, in this distance, the laser is transmitted independently. Once the human eye (especially the child who loves to move) gets involved, it is likely to cause unimaginable serious consequences. Second, the laser TV is to launch blue laser imaging, because the short wave blue light of the laser source is the killer of the human eye. Even if you do not look directly at the laser beam, long-term viewing of the laser TV may still cause harm to the human eye. " Medical analysis.
Laser TV is short focus projection in essence, which breaks through the situation that projection was mainly used in non family consumption scene before, and its main advantage is large size. For large-scale TV, its brightness and resolution are two important evaluation criteria. There are two brightness standards for laser TV, one is the brightness of projector, the unit is lumen, the other is the brightness of anti reflection of light curtain, the unit is nit. When it is used, the projector will emit light. When the light meets the anti light curtain and is reflected into the eyes of the audience, the picture will be formed. At present, the reflection brightness of most laser TV anti light screens is only 200 nit-250 nit, and the average brightness of the TV is 400 NIT in ideal condition.
In terms of brightness, the display device will also encounter the problem of brightness loss. In order to resist the influence of ambient light, LCD TV adds the design of "upper polarizer", which is enough to absorb most of the ambient light, so it can also achieve high contrast in the light environment. In terms of sales, most of the demonstration scenes of laser TV are in the dark environment. This is because laser TV is very easy to be interfered by the bright environment. In order to fight against this kind of interference, users must buy an anti light curtain. At present, there are mainly two types: Fresnel curtain and black gate. A good anti light curtain has a high price.
Laser TV is basically not physical 4K, that is, the original 4K. It is very difficult for laser TV to form 4K and 8K picture expressive force. At present, most of 4K laser TV adopts DLP XPR jitter technology. This is actually a kind of pixel displacement technology, through which the resolution can be enhanced. In practice, it can be generally understood that the laser TV equipped with 0.47dmd display chip "shakes out" 4K with the resolution of 1080p, while the laser TV equipped with 0.66dmd display chip "shakes out" 4K with 2K.
Analysts in the household appliance industry say that at present, the global dispute over the direction of display technology mainly occurs between OLED and QLED quantum dots. It is generally believed that TV other than these two display technologies can hardly grow into mainstream, including laser TV.
Some consumers after buying laser TV Tucao said "laser TV looks gray," "only in the middle, there is no picture on the side of the screen, make complaints about eye protection?" Make complaints about mobile phone products, computer industry analyst Liu Buchen said that in recent years, the incidence rate of eye diseases in China has been significantly improved. Many people have such confusion: the mobile phone and computer will be dry and painful for a long time. The reason is that the short wave blue light emitted by the display will cause more short wavelength blue light emitted by the laser TV, so laser TV can easily cause eye fatigue. , bad for eyes.
"The harm of laser to human eyes is mainly reflected in two aspects. One is that direct vision laser may cause temporary blindness or permanent blindness. Because there is a distance between the laser emitted by the laser transmitter and the TV screen, in this distance, the laser is transmitted independently. Once the human eye (especially the child who loves to move) gets involved, it is likely to cause unimaginable serious consequences. Second, the laser TV is to launch blue laser imaging, because the short wave blue light of the laser source is the killer of the human eye. Even if you do not look directly at the laser beam, long-term viewing of the laser TV may still cause harm to the human eye. " Medical analysis.
Laser TV is short focus projection in essence, which breaks through the situation that projection was mainly used in non family consumption scene before, and its main advantage is large size. For large-scale TV, its brightness and resolution are two important evaluation criteria. There are two brightness standards for laser TV, one is the brightness of projector, the unit is lumen, the other is the brightness of anti reflection of light curtain, the unit is nit. When it is used, the projector will emit light. When the light meets the anti light curtain and is reflected into the eyes of the audience, the picture will be formed. At present, the reflection brightness of most laser TV anti light screens is only 200 nit-250 nit, and the average brightness of the TV is 400 NIT in ideal condition.
In terms of brightness, the display device will also encounter the problem of brightness loss. In order to resist the influence of ambient light, LCD TV adds the design of "upper polarizer", which is enough to absorb most of the ambient light, so it can also achieve high contrast in the light environment. In terms of sales, most of the demonstration scenes of laser TV are in the dark environment. This is because laser TV is very easy to be interfered by the bright environment. In order to fight against this kind of interference, users must buy an anti light curtain. At present, there are mainly two types: Fresnel curtain and black gate. A good anti light curtain has a high price.
Laser TV is basically not physical 4K, that is, the original 4K. It is very difficult for laser TV to form 4K and 8K picture expressive force. At present, most of 4K laser TV adopts DLP XPR jitter technology. This is actually a kind of pixel displacement technology, through which the resolution can be enhanced. In practice, it can be generally understood that the laser TV equipped with 0.47dmd display chip "shakes out" 4K with the resolution of 1080p, while the laser TV equipped with 0.66dmd display chip "shakes out" 4K with 2K.
Analysts in the household appliance industry say that at present, the global dispute over the direction of display technology mainly occurs between OLED and QLED quantum dots. It is generally believed that TV other than these two display technologies can hardly grow into mainstream, including laser TV.
