On November 20th, the domestic laser non-screen TV maker Miji Technology won Baidu’s lead round C financing and became the domestic focus. On the 23rd, Hisense released a number of 4K laser televisions, continuing to increase the demand for laser televisions to replace LCD TVs. Laser TV, also known as a laser projector, is essentially a laser light source projector using a reflective ultra-short-focus projection technology. Its hardware consists of two parts, one is a reflective ultra-short-focus projector, and the other is a Projection screen. And it dared to call itself "television" mainly because it used laser light as the light source, its performance surpassed that of traditional projectors, and it was equipped with a light-resistant screen; ultra-short-focusing characteristics, and it could be used directly on a TV cabinet. However, due to the high cost of malformation, laser television is considered as a niche. Currently, it can only replace traditional projectors and capture the joy of home theater enthusiasts.
Does the industry specialize in "laser television" projectors or television?
In essence, the so-called "laser television" simply replaces the projector's light source with a laser light source and replaces the common curtain cloth with a light-resistant screen, making the traditional projector industry rejuvenate and renaissance. TV". The inducement of some manufacturers and some media public opinion will reflect the limitations and shortcomings of current laser televisions for laser TVs to replace LCD TVs in the future. The current laser television is only a conceptual, niche, and trial product. Self-limitation in the field of large-screen hard-to-reach LCD is the strength of the projector. It is obviously unreasonable to compare the advantages with the disadvantages of the LCD. The true TV can be “size-take-all†in size, and the essence of the laser TV remains. It is a projector, when the projector and the anti-light curtain are missing one, they return to the "projector" property, so the combination of the two is called "laser television" is not rigorous.
Laser TV is a solution-based product that integrates projection technology, light-resistant screens, sound systems, and intelligent systems. It cannot be simply equated with the projector, but it is just a simplified version of the TV. It shows: The life of laser television is to make a cheap "screen." In order to achieve higher brightness and color gamut and image quality equivalent to display technologies such as LCD TVs, it is more costly and more expensive to achieve the manufacturer's desired target value in a complicated and expensive way of laser projection. Expensive. This approach has not always been advocated by the mass market. It is also unfair to consumers. The cost of laser TV's excellent performance during the day is the high price of professional anti-light curtains, which is equivalent to consumers must be prepared to pay close to several thousand or even tens of thousands of curtain prices.
On the technical side, scanning deflection in laser televisions is a problem: Like CRT color kinescopes, the laser beam scans the entire image from top to bottom in a row. Such as high-definition picture 1080 lines, the refresh rate of 50 times / sec, will scan 54,000 times per second, the use of eight prism wheel, because the rotation can scan eight times a week, so 54,000 times //8 to 6750 revolutions / second, The rotation speed of the prism wheel is equal to 405,000 revolutions/minute. Noise, lubrication, cost, and service life caused by such a high speed can hardly satisfy practical conditions for placing on the market.
In addition, in the current mainstream of smart TVs, many laser projectors do not have smart systems, and they cannot implement smart operating systems for smart TVs at the moment. Technologies such as voiceprint recognition and face recognition that promote human-computer interaction are Cannot be achieved with a projector. Moreover, the resolution of the current projector has always been a short board, like the market's pseudo 4K LCD TV, the resolution of 4K requirements, does not mean that it can provide 4K experience. At present, although most 4K TVs use 4K screens, they still maintain a 2K configuration in the chip and image engine, which makes the TV unable to present the 4K effect. It is called pseudo 4K. Many laser televisions in the market are known as 4K, but the resolution of the lens is 1080P, and the real full 4K will undoubtedly require a 4K screen. Second, to achieve the 4K resolution core indicators need to rely on upstream chip manufacturers to provide the appropriate chip, while the upstream core chip provider for laser television is mainly Texas Instruments, the anti-light curtain is enough to be prohibitive, based on this added 4K Technology will undoubtedly push prices to the "Gao Ko."
According to the general situation of the current domestic housing structure, in general, 70-inch LCD TVs are already the largest size choice for small and medium-sized home users, and even bigger products will cause users trouble. In the current mainstream 55-inch television, the best viewing distance in the living room is 2-3 meters, and the most common limit distance in most domestic family living rooms is 3-4 meters, not to mention a hundred-inch curtain In the living room, not only the design of some living rooms can not display a huge screen, nor does it meet the viewing distance of the human eye.
Industry insiders claimed that large-screen TVs performed exceptionally well in terms of picture quality and picture detail, but because of the limitations of the human eye, they were too close to the screen and corners were ignored by the eyeballs. Many consumers blindly pursue large sizes, but they ignore the viewing distance of the living room. Finally, the television is placed in the living room, although it is very good, but it is especially difficult to watch. The 150-inch 4K resolution TV has a height of approximately 1.87 meters. To obtain a comfortable viewing effect requires more than 3 meters or even a distance of 5 meters. This means that the viewer is sitting in the living room looking up at Yao Ming. Including the height of the TV cabinet, to watch this oversized TV, at least a tenth-class villa living room is required.
The brightness is not enough to resist the light curtain
The projector is a reflective display technology (the human eye perceives the brightness of the projector's light reflected directly into the human eye after entering the screen). This mode causes the projector's brightness test to be not so easy, so the brightness of the projector industry Marking problems have not been well resolved. At present, although the nominal brightness of many laser televisions reaches a level of 4500 lumens, the actual measured ANSI luminance still exceeds 3,000 lumens, and its average level is at 2,300 ANSI lumens. As a result, luminance imaginary becomes a common phenomenon: the brightness and contrast of the machine are adjusted to the maximum, and a better-looking number is obtained. In this state, the details and color of the screen are abnormal.
For example, the "light source brightness" proposed by Xiaomi belongs to the word game, which avoids the actual value after the brightness loss. According to Xiaomi's concept of “brightness of light sourceâ€, 4000 ANSI lumens of T1 has reached 25,000 lumens.
Analysts say that high lumens is not a place to boast about. High brightness is partly to counter the loss of ambient light and brightness. The fight against ambient light is a common issue for all display devices, and the cost of the display system is huge. At this year's CES show, MADI displayed a 120-inch two-color super-reflective short-focus laser television product. The main highlight is the brightness of two-color laser + super short focus + 5000 lumens. The two-color 4K laser previously released by Hisense - one of the highlights is the actual screen brightness of 360 nits, the actual working brightness of the screen reached 360 nits. It is understood that for advanced anti-light curtain, it often means that 100 inches need 4300 lumens of brightness, if it is a 120-inch screen requires 6000+ brightness, and on this basis, 140-inch high-definition laser television will be almost equal 8500 lumens, which means that 150 inches will undoubtedly need to exceed this value. The average home projector is 800-1000 lumens.
However, the brightness of the projectors given by the manufacturers is an ideal index under ideal conditions and under ideal conditions. The ideal value is the state that cannot be seen in actual use. In other words, consumers do not need to use ideal brightness in their daily lives, nor should they pay for the extra portion.
However, the so-called nominal brightness of the projector is a "big as possible" parameter obtained under a harsh condition: corresponding to this is "the brightness of the actual projected picture." The actual brightness will be disturbed by more complex environments. It will include the projected screen size, the distance between the centers, the viewing angle and range of the screen, and the working conditions of the projector.
As a result, current laser televisions all emphasize one point: high-contrast, anti-light screens and bright ambient light also work well. However, the actual situation is always complex and varied. The effect depends on the confrontation with the ambient light. For ultra-short-distance reflection short-throw projectors, Fresnel prism structures are often used to distinguish between ambient light and picture light. Of course, this technique of distinguishing the picture from the ambient light will, when absorbing and reflecting the ambient light, miss some of the ambient light and also lose some of the screen brightness. The resulting cost is the same as flat panel display above polarizer resistance to ambient light: a large amount of brightness loss. And the better the anti-ambient light effect, the higher the brightness loss.
Relevant practitioners have said to home power grid that most laser televisions currently have a brightness of only 200 nits to 250 nits on the light curtain—an indicator that is only the lowest standard for LCDs and OLEDs. If a long-term stable 360-nit display is achieved on a 120-inch screen, the projector needs 6000+ brightness to achieve the desired results. Anti-light curtain technology is good, but it is subject to the balance between the two parameters of contrast and brightness, but also need to consider the brightness and performance of the projector, and its anti-light effect is not an absolute value.
The cost of failing to achieve trichromatic light is still deterring users
Normally, TVs are trichromatic RGB, such as LG OLED TV's WRGB four-color technology, Samsung's quantum dot film can be issued under the excitation of blue LED light source, RGB primary colors and comes with wide color gamut technology; Father of LCD Sharp Based on the RGB primary colors, new edge color backlighting technology was added. Sony added RIM color display technology (TRILUMINOS Display wide color gamut display technology) and "Backlight Master Drive technology (dynamic backlighting) System - Master Edition)". In the laser television is 100% monochromatic light, that is, blue laser as the core, with yellow fluorescent pink wheel to form white light. This kind of light source mode has low cost, but the final color effect is not good, because there is no native red and green in this system, the monochromatic laser is always running at high pressure, and it is easy to produce color drift and the brightness is not high. In theory, three-color lasers work best, but because of the high price of the red and green laser generators and the complex structure of the three-color lasers, the cost is hard to reduce and only appears on high-end movie projectors. Accept the high price of three-color laser source projectors. Therefore, there are almost no laser televisions equipped with three-color lasers on the market.
So two-color light has become the first choice of high-end, the so-called two-color laser is actually in the blue + fluorescent pink wheel mode to add red laser, so this system will have a native red, more helpful for image quality enhancement. Both Hisense and Miji have launched dual-color laser televisions. Such as the 4K dual-color laser screenless TV T1, in terms of brightness, not only up to 4000ANSI lumens, while viewing the brightness also reached 3500ANSI lumens, there is no doubt that the market is currently the highest brightness of the laser screenless TV, but such a The price of Taiwan equipment is as high as 80,000 yuan, which has already reached the price of a compact car for ordinary families. Of course, there are also cheap programs, such as millet laser television only sell 9999 yuan, subvert the price system of laser television. In 2016, there were laser televisions priced at more than 20,000 yuan, and products priced at 780,000 yuan. Products with prices of more than 100,000 yuan were sold. Although the resolution of these products was different, there were differences in the price difference. If the price is always high, laser television can only become a "local tyrant" plaything.
The above-mentioned sources stated that “laser TV†is still in the incubation period for infants and young children, and it will take time before it reaches the public living room, but it is obviously not the moment, but it is feasible to go into the super villa. The ideal value is very full, but the reality is still a sense of bone, and the world of "local tyrants" is difficult to read.
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