What light source do the current smart projectors use? Today, we will follow this question and take a look at the light sources used by smart projectors. At the same time, we can compare which light source is more in line with the future development trend and which light source has better effect.
First of all, we need to know which light sources are used by projectors now. Earlier, most projectors used light bulb machines, especially in classrooms and offices, where light bulb machines were the most common. However, the life of the lamp machine is relatively short and the subsequent maintenance costs are expensive, so after the LED light source comes out, the market share of the lamp machine is stolen. Today, mainstream projection brands are basically LED light sources or laser light sources. Compared with laser light sources, the market for LED light sources is larger, because the cost of laser light sources is relatively high, so many people cannot accept the selling price.
Light bulb light source
Use a projector for light bulb light source, there are many types, such as halogen bulbs, also known as tungsten halogen bulbs and quartz bulbs, which are a variant of incandescent bulbs. This kind of light bulb was used in early movie projectors. The principle was to inject halogen gas such as iodine or bromine into the light bulb. At high temperatures, it can produce chemical effects by sublimating tungsten wire and halogen. The cooled tungsten will re-solidate on the tungsten wire, forming a balanced cycle to prevent premature breakage of the tungsten wire. In addition to halogen bulbs, there are also xenon light sources. The discharge substance in the lamp is an inert gas xenon, whose excitation potential and ionization potential are smaller than that of the ionization potential and , which is higher in life and brightness than halogen lamps.
LED light source
LED light source projectors are now widely used, unlike ordinary lighting LED lights. The projector's LED light source adopts a customized mode to improve the brightness of the LED light. Through three different colors of LED light sources, red, green and blue, a projection light source is constructed, and the three-color mixed light reaches different colors to present, which can cover the sRGB color gamut.
laser light source
laser light source has a very high brightness, which is incomparable to the first two. But relatively speaking, the cost of laser light sources is also high, so the product price is not cheap. Laser light sources are divided into monochrome, two-color and three-color laser light sources. Among them, monochrome is to use a single blue laser to excite the yellow and green phosphor on the fluorescent color wheel, and then divide the red, green and blue light through the prism, and finally form other colors. Then, the color is purified through the filter . There is a problem with monochrome laser light sources because they do not have red and green light. When the brightness is high, they are likely to lose color, resulting in the picture color restoration not being high enough.
In comparison, the three-color laser light source has better colors. It uses red, green and blue lasers as light sources. It is a real high-purity color red, green and blue light source. It has higher color grayscale performance, real color restoration effect, and strong sense of layering of the picture. The three-color laser light source can reach 100% BT.2020 color gamut coverage.
After comparing several light sources, it is not difficult to find the advantages of three-color laser light sources. However, although the three-color laser light source has good effect, it also has the problem of speckle. If any brand can solve the cost and speckle of the three-color laser light source, then the projector of the three-color laser light source will take a big step. It is reported that domestic brands are already being laid out and have made great progress. The new product of three-color laser light source is probably coming soon. Everyone can look forward to it!
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