When it comes to home projection, many people will be entangled in DLP technology or 3LCD technology, but this is only the difference between the projection display chip and working principle. For projection, there is a more important key factors that can affect color and brightness. That is the projection light source. The progress of almost every light source technology will bring a projection display effect. From candles, oil lamps to steam lamps, to later traditional light sources such as halogen lamps, pyrum lamps, and LED light sources and laser light sources now on fire. So how do you choose the light source of projection for home use?
At present, the projected light source on the market can be divided into traditional light sources, LED light sources and laser light sources. The three have their own advantages and regrets. Traditional light sources are the bulb machines commonly common in the classroom and conference room. Due to the high cost of maintaining short life, if it is not for office or commercial, it is not recommended for home use. Therefore, we mainly analyze the LED light sources and laser light sources in this article.
❶ LED light source
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Our common LED (light -emitting diode) is made of electrical lighting principle. It has two electrodes in its outer layer. The internal core is the size of the sesame size of the beads. This chip is divided into several layers: the top layer: the top layer It is called the P -type semiconductor layer, the middle layer is the luminous layer, and the bottom layer is called the N -type semiconductor layer.
When the two electrodes are added to the two electrodes, the current will pass through the chip, the cave in the electron and the P -type semiconductor in the chip, and the lighting layer in the luminous layer is violently collided, resulting in the transition, change and compound of electrons in the energy level. Eventually, the light is emitted in the form of photons, which is the light that everyone sees.
LED chips are often presented in a combination, which constitutes the many lamp sources of our daily use, such as LED light bands and LED lamps. I believe you can also see them in the corner of your home.
However, the LED light source used in the currently on the market is very different from the LED lighting bulbs commonly common in our lives. The LEDs used in projection are customized high -power LED light sources, and they are usually used as three different colors of red, green, blue, and blue. LED light sources together constitute the projection light source. Different colors are achieved through the red, green and blue three -color mixed light. The cost is more than dozens of times higher than the common LED lighting bulbs. The main suppliers are Osram. Used in projection.
Because the home projection of LED light sources uses the native red, green and blue three -color LED, the LED light source projection can theoretically cover the SRGB color gamut. At present It can reach the SRGB color gamut coverage of more than 90%, and some good products can even achieve 98%. This is the color gamut performance that the same price monochrome laser projection cannot reach.
Many people criticize that the brightness of LED light sources is low. This is indeed the same. Early, the technical restrictions of LED light sources were limited by LED light sources. The projection brightness of LED light sources was often low. However, with the rapid development of LED light source technology in recent years, high -power LED optoelectronics semiconductors have been popularized, and now the Household projection brightness of LED light sources has entered 2000ANSI. For example It can cover the entire home scene.
❷ laser light source
If the LED light source is the moment of the projector, then the laser light source is the future, because the biggest advantage of the laser light source is the brightness, far exceeding the current LED light source. At the same time, the laser light source can directly select the red, green, and blue laser generator of the required specific band according to the need. The limits that the domain can cover, taking the Sony A90J OLED TV as an example. It can only cover 70.95% of the BT.2020 color gamut, and even P3 color gamut can only cover 98.16%.
However, it should be noted that the above is just theory. In fact, there are still many problems that are not solved in the current laser light source application. There are two main types of laser light sources on the market. One is monochrome laser and the other is three -color laser.
“Monochrome laser”:
As the name suggests, it is to use a single blue laser to stimulate the yellow and green fluorescent powder on the fluorescent wheels, and then divide the red, green, and blue light through the prism, and finally combine other colors. Then The representative model is Dangbei X3 and Mijia Laser projector.
However, the projection product that is not recommended at present is the projection of monochrome laser. Monochrome laser needs to rely on filter/color wheels to stimulate the three primary colors. Color laser projection cannot achieve color and brightness. If you want to play the brightness advantage of the laser, you must sacrifice the color purity of the three primary colors, that is, the color gamut coverage of the projection screen. Taking Dangbei X3 and Mijia laser projection as an example, its SRGB color gamut coverage is only 80 80 About %, far lower than the average level of LED light sources on the market, and greatly sacrificing the brightness improvement of the quality of the picture quality. Something is a bit more worthy.
Someone here will ask, what about the purity of the laser? That means that monochrome laser cannot bring higher brightness. Under the same color gamut coverage, the brightness of monochrome lasers is not even as good as the performance of three -color LED.
“Three -color laser”:
In fact, the three -color laser is mentioned. Because the source of the three -color laser light is high, it is generally only tens of thousands of yuan or even hundreds of thousands of yuan. Color performance can be applied in professional fields such as cinema, engineering, such as laser IMAX and Dolby vision cinema.
However, the three -color laser is not without shortcomings. Due to the coherence of the laser, there will be a problem of scattered spots in congenital, that is, there will be heavy shadows on the screen. Essence However, the household three -color laser products are limited by the cost of cost. At present, it is difficult to solve the problem of scattered spots. Hisense and nuts of three -color laser TV all have scattered spots. At the same time, due to the reasons, the family -grade three -color laser TV usually usually uses them. It will be used as a lower low -power light source. The consumer -grade three -color laser TV has the advantage of the brightness of the three -color laser TV. It just exerts the color gamut coverage of the three -color laser.
Overall: Three -color laser> Three -color LED projection> monochrome laser
① Three -color LED light source is mature, which is currently the most mature home projection solution on the market.
② Although the cost of monochrome laser is slightly low, in order to ensure a certain degree of brightness advantage, it has to sacrifice color, resulting in low color gamut, showing the color of the picture, but not as good as the picture quality of the three -color LED light source projection.
③ The three -color laser light source is an absolute frontier, but the cost is too expensive. And at this stage consumer three -color laser TV, because there is no reliable scattered spots treatment scheme, there are scattered spots caused by three -color laser, that is, the lines in the screen will have heavy shadows and other problems. Selected, but in the future.
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The picture comes from the Internet
The picture comes from the Internet
The picture comes from the Internet
The picture comes from the Internet