After more than 20 years of development, the projector can be said to have encountered a lot of bottlenecks today, and the entire projector field has never looked forward to the technological revolution like today. Due to the traditional light source of the projector, no matter whether it is brightness, color or power consumption, it has been unable to reach a higher height, so the revolution of solid-state light source has arrived. The emergence of laser projection technology has indeed left endless curiosity and speculation for many projection enthusiasts. What kind of mysterious thing is laser projection technology? Let us analyze the internal structure and technical advantages of laser projectors. And the product to introduce the predecessor of laser projection technology.
1. Solid-state light source is the trend and the direction of future development
The solid-state light source is a revolution in light source technology, a leap-forward development, and a future trend. Perhaps a general introduction to solid-state light sources is difficult for readers to understand, but it is more specific if you talk about the recently hot LED light source and the laser light source that is partnered with it. It should be said that the LED light source and the laser light source are two technologies of solid-state light source, each having its own advantages and application fields. The LED light source can make the projector volume smaller and more environmentally friendly. But LED products also have their limitations. For example, in terms of brightness output and luminous flux of the projector's most important technical indicators, the current LED light source products are generally not high, thus limiting its application range, and is only suitable for use in smaller scenes.
The laser is an abbreviation of the first letter of each word in the English "Light Amplification by Stimulated Emission of Radiation". It is an abbreviation of "Enlarged by Excitation Radiation Light". It has a small divergence, a single wavelength, good coherence, and energy density. High outstanding features. Due to the principle of the laser, the light emitted by the laser is unidirectional light, and the laser can emit nearly parallel light with almost no divergence, which allows the laser to converge a large amount of light energy in a very small area, that is, the energy density is extremely high. Just like using a convex lens to collect sunlight, it can burn things. Even if the laser produces a few kilometers, the spot diameter is only a few centimeters. This highly concentrated laser beam has high reliability.
Here we focus on the laser source technology, which uses a laser beam to transmit the image. Among them, the optical components of the laser projector are mainly composed of a red, green and blue light valve, a combined X prism, a projection lens and a driving light valve. There are red, green and blue lasers in the laser projector. After the laser is expanded in the machine through the corresponding optical components and processing chips, it is transmitted to the X prism to integrate the three lasers, and then the integrated objective laser is transmitted to the projection screen by the projection objective to complete the entire laser projector display process. . Laser technology as a projection light source is a future development trend, but it is also a fact that LEDs cannot be completely replaced in the short term. However, with the development of technology, laser light sources will be popularized in the projection field, which will inevitably lead to a revolution in display technology, and will completely subvert the traditional display field.
2, the emergence of laser light source
Simple lasers have long been used in the real world, but they are more focused on light and shadow. The large-scale laser stage effect is very dazzling and can be performed in an open outdoor. There are also many wonderful application cases in China, especially for large water curtain movies. However, laser as the light source of the projector is only a big event in the past two years. Compared with traditional light sources, LED light sources and laser LED hybrid light sources, pure laser technology is more difficult and historical. Traditional projectors use light bulbs as light sources, and the bulbs are filled with high-temperature gas during operation, which makes projections using traditional light sources. There is a danger of the fuselage. The laser uses packaging technology, so the sealing performance and impact resistance are very good, not easy to damage. Use it in harsh environments for a long time, and don't worry about the damage of the light source.
In addition, from a health point of view, the laser source does not contain harmful substances such as mercury and sodium, and there is no environmental pollution caused by the ultra-high pressure mercury bulb, which meets the requirements of environmental protection, effectively reduces environmental pollution, and creates a green and healthy projection environment.
It cannot be said that even if a laser light source is used, this does not change the imaging principle and technology of the projector. The projector product of DLP, LCD or SXRD technology can still use the laser light source.
3, the advantages of laser light source
As a new projection light source, the emergence of laser light sources has solved many problems that projectors have encountered in the past, such as service life, color, power consumption and so on. It is undeniable that all illuminators are hot, and heat is the deadly source of detrimental service life. At this stage, the laser light source can work for 10,000 hours in normal mode and 20,000 hours in energy-saving mode. According to the data provided by a brand of laser projection products, the laser source begins to have a significant brightness decay after 5000 hours, and after 14,000 hours the brightness will be attenuated by 40%, but still nearly 60% of the brightness can be used normally. Compared with the traditional light source of 2000 lumens, the energy-saving mode has a limit life of 6000 hours, and the advantages of laser technology are very prominent. For example, ordinary projector bulbs generally have a life span of several hundred to thousands of hours, require regular maintenance and replacement of the bulb during use, and are prone to cracking or explosion due to unstable structure of the bulb. The laser projector laser structure has high reliability. According to the existing experimental results, the life expectancy is up to 100,000 hours, which is 9-10 times of the service life of the ultra-high pressure mercury lamp. It reduces maintenance and operating costs compared to projectors that require a replacement lamp. And the brightness attenuation is not obvious for a long time, and can maintain vivid image quality for a long time.
4, high purity, large color gamut
The laser light source makes full use of the characteristics of laser wavelength selection and high spectral brightness. Therefore, the display image has a larger color gamut, and its color gamut coverage can reach more than twice that of the phosphor, which can achieve the color space recognized by the human eye. More than 90%; and the laser is a line spectrum, with a high color saturation, completely break through the deficiencies of the color spectrum of the first three generations of display technology, to achieve the most perfect color reproduction in human history, so that people see us the most authentic through the display terminal The most beautiful world. Due to the use of very high purity red, green and blue primary light sources, the laser source can achieve a color space that is much larger than the traditional NTSC or DCI minimum color range, and can display most of the colors that the human eye can recognize. Regardless of which white field chromaticity standard is adopted, laser light sources that can be accurately controlled for the three primary colors of red, green, and blue are easily realized. At present, most xenon lamps used by projectors need to be controlled by color filters, which not only reduces The light utilization efficiency of the light source is not easy to adjust and manage the control for the chromaticity.
to sum up
Traditional bulb light sources have been subject to certain bottlenecks due to their limited life span and the user's late maintenance costs. Especially in the engineering projector market, which has gradually become hot in recent years, the new light source has become a sought-after object of many manufacturers, such as laser light source technology, which is not only easy to improve brightness, but also very suitable for high-end engineering projector products, making it more cost-effective. For traditional bulb light sources. The projector with laser source is more advantageous than the current products of other projection sources. We believe that with the mature laser display technology combined with the huge display market, the huge commercial value of laser display technology will bloom.
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