The last six months, online laser TV advertising more and more, but the physical stores are generally placed separately laser TV and LCD TV, so that consumers can not directly compare the difference between laser TV and LCD TV screen, so I bought a higher level of 4K laser TV, with a large 4K LCD TV at home, to actually compare the picture effect of large-screen laser TV and LCD TV, to give consumers a more accurate reference.
Note: This review on the matter, not related to the specific brand, the product all obscured features, and please do not ask me which brand of products / models this is. The two screen sizes are about the same, but the price is cheaper in terms of LCD TVs.
First some simple science about laser TV, a general understanding of.
Laser TV is essentially a kind of projection, but the projection distance is very close to the curtain, installed directly under the curtain can be, and ordinary projection generally to pull away from the curtain a certain distance, so the laser TV is also called ultra-short focus projection. Laser refers to the projection light source is a laser light source, longer life, more vivid colors.
Laser TV curtain
At present, laser TV curtain basically use Fresnel screen or black grid screen, this is a special curtain, the surface has a fine optical structure, can shield the stray light, so that the laser TV shot light as far as possible to the front reflection. The more advanced laser TVs generally use Fresnel hard screens, compared to the black grid screen, frontal viewing, higher brightness, higher contrast, and better picture effects. But it is also because of this structure, making the Fresnel screen viewing angle is very bad, from the side to see the brightness decay is very serious, far worse than the black grid screen, there are gains and losses. The laser TV in this test uses a Fresnel hard screen.
Laser TV uses a semi-concentric Fresnel hard screen can offset the three directions of the stray light, but can not offset the stray light from below, so as long as the lights or open curtains, you can not avoid the stray light from the bottom of the impact, resulting in a white screen.
Semi-concentric circle Fresnel hard screen
Laser TV is more affected by ambient stray light
Interestingly, many laser TV posters say “laser TV is diffuse reflection than direct light more eye protection”, to put it bluntly is false propaganda, because laser TV whether using Fresnel or black grid, their characteristics is to let the light shot to the front, can not be like ordinary white curtains ” diffuse reflection”. The thief cries out for help.
For this fictional concept, creating fear to sell products marketing strategy I am very disgusted.
Laser TV chip
DMD chip is the core of the laser TV / projection, determine the picture clarity, the current laser TV either 0.47 inches or 0.66 inches DMD chip, 0.66 inches is very expensive, the corresponding products are also very expensive, so the relative civilian price of the laser TV commonly used 0.47 inches chip, including my this is.
But whether it is 0.47 or 0.66 inches, are to be dithered to achieve 4K resolution, so there is still a certain gap with the native 4K resolution.
It is recommended to click on the computer to see a larger image is more intuitive. It looks like it is not in focus, obviously not as clear and sharp as the LCD TV lines
The brightness of laser TV
Most laser TVs use lumens or ANSI lumens to do units, but consumers do not intuitively feel how much brightness, some of the more confident brands use nits to express the brightness of the laser TV screen, my laser TV measured brightness between 320 and 340 nits, equivalent to the low-end LCD TV brightness, but in the laser TV, the screen brightness of about 350 nits has Consider the higher level. In the case of full shade, the laser TV screen performance is better, the color is bright and full, but as long as the curtains or lights on, because of the impact of ambient stray light, the picture effect will be greatly reduced, obviously white.
LCD or OLED TV to achieve a better HDR effect, the need for peak screen brightness of 800 to 1000 nits, this brightness is very high? In fact, there is no, the winter noon sun shines on the white wall, brightness up to 25000 nits, for the ambient light, 1000 nits of brightness is actually nothing, and the TV screen is only a small / short time high brightness.
Laser TV propaganda “eye protection” is the main reason is the low brightness and “diffuse reflection”, before we have proved that “diffuse reflection” is a thief, then the low brightness is eye protection is more Shameless, and laser TV due to the color wheel high-speed rotation (60HZ), the picture is flickering, which no brand dare to speak. This point will be sent after the video.
The color gamut of laser TVs
Many laser TVs will be on the poster to blow their color gamut high, of course, indeed very high, both monochrome dual-color or tri-color laser, color gamut is very high, the screen color is bright, in a fully shaded environment, only quantum dot LCD TV can compete with it, but there are ambient stray light interference, white-out is still relatively obvious.
The picture effect comparison actually does not need to say too much, the actual video and pictures sent to everyone can see the difference at a glance.
①The picture effect comparison 15″~2’06”
②HDR screen comparison 2’06″~2’26”
③Clarity comparison 2’26~2’41”
④Viewing angle 2’41″~2’57”
⑤Flicker problem 2’57″~3’51”