At this year's CES, the competition for display technology is lively. LCD TV backlight area control and dynamic adjustment have become the standard for mid-to-high-end products; the technology of OLED screen sound has penetrated into more brands; 8K, Micro LED technology that cannot be mass-produced in a few years is also hot.
Among them, the laser projection camp has become more powerful. Hisense launched a 50-inch two - color laser TV , Changhong released a three-color 4K laser theater, and Sony also brought the previously commercial laser TV into the living room of ordinary users.
Although the brightness of laser TV is still difficult to compete with ordinary LCD TVs, the shocking effect of large size is unmatched by ordinary TVs. If you decide to buy a laser TV, then the following four points need attention.
There is a bear baby to buy a screen-out function
In fact, this function is very simple, that is, an infrared device is installed near the lens, and it will automatically go out when an object is sensed to be close to the lens.
Many people think that this function often has misoperations, but especially for users who have children at home, especially when the baby is just learning to walk, this function is very necessary, it can avoid direct glare into the eyes. The situation happened.
The child who just learned to walk, feels fresh about everything, and sees what he wants to see in the past. And the adults at home can't watch them all the time, and there will inevitably be time for distraction.
At a closer distance near the lens, the concentration and brightness of the light are very high, and the child's eye structure is still developing. The direct light is likely to stab the eyes and even leave sequelae.
Interface and auto focus
According to observations, most of the short focal length laser projections on the market currently use manual focusing. Don't think that if the laser TV is adjusted once, you can enjoy it forever.
Not only is it occasionally inserted into a USB flash drive, but even an HDMI is easy to make a mistake. Home projectors are inevitably "hot out of focus".
The so-called "hot out of focus", commonly known as running focus. It means that the projector has just been working for about half an hour, the internal temperature of the projector and the ambient temperature gradually reach the thermal equilibrium process, and the lens is slightly deformed with temperature changes, resulting in a blurred projection picture. That is, the convex lens is thermally expanded and contracted by heat, resulting in a change in focal length.
The number and type of interfaces determine the devices that can be connected. At least HDMI and USB should be used in more than two types.
Since laser TVs are ultra-short-focus products, the back of the fuselage is very close to the wall, so it is often not seen when connecting other devices. If the number of interfaces is too small, it is more troublesome to switch between different devices, especially for projections without autofocus.
Of course, some manufacturers have discovered this problem, and installed common interfaces such as HDMI and USB on the side of the fuselage, while the less common interfaces such as audio input are designed on the back of the fuselage. This type of product is also relatively more user-friendly.
Don't ignore the light curtain
For users who have posted wallpaper or brushed special color paints, they will buy anti-glare cloth, anti-light board and other ancillary products when buying laser TV. Users of the big white wall will save money.
In fact, the screen of the factory trademark is not only used to project the image, but has the effect of resisting ambient light. It can be said that in addition to the brightness of the machine itself, the function of the anti-light curtain can not be ignored.
The anti-light curtain is different according to the principle of anti-light, and the physical structure is used to achieve the anti-light effect, and the optical coating is used to achieve the anti-light. But no matter which way, its essence is to overcome the interference of ambient light and refract the projected light more into the user's eyes.
Correspondingly, the white wall is the effect of diffuse reflection, that is, the light will refract around when it shines on the white wall, and the brightness of the natural picture will become lower.
With the professional anti-light curtain, the biggest difference for the actual experience is whether you can see the image during the day.
Keystone correction is better with physical adjustment
Focusing is mentioned above, and automatic is stronger than manual. But switching to keystone correction, manual is stronger than electric.
The so-called trapezoidal correction is when the laser TV is placed horizontally, or when there is a certain deviation in the vertical angle, the screen will obviously project a non-rectangular quadrilateral due to the short focal length.
Through the trapezoidal correction function built into the system, although the screen can be regressed in all directions, the resolution of the output is actually lost. That is to say, there are 4,000 pixels in the horizontal direction. After software adjustment, the display may become 3800 pixels, while the remaining 200 pixels will not be projected.
Physical adjustments can solve this problem, and unlike focusing, the number of re-adjustments is relatively small.
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