Is laser projector
better? Before we get into that, let's figure out what a laser projector is and the development of the projector.
So what is the laser projector? And what is the development history of the projector?
Let's start with the development of projectors.
The birth of the projector：
In 1640, a Jesuit priest named Cheyser invented a slide projector called magic light, which used the principle of reflecting light from lenses and mirrors to reflect a series of pictures onto the wall. It was a great invention at that time. It was very popular.
With the rapid development of industrial revolution, slide projector has entered the industrial age.
The industrial production of slide projector began in 1845, and the light source was changed from candles at the beginning, to oil lamp, gas lamp, and finally to electric light source. In order to improve the quality and brightness of the picture, concave reflector is installed at the back of the light source, which increases the temperature of the chassis.
In order to dissipate heat, exhaust heat dissipation structure is installed in the slide projector. Input has been changed to automatic. The earliest slides were made of glass, painted by hand. In the mid-19th century, after the invention of celluloid film in the United States, slides began to be produced by photographic transfer method. The slide projector which is widely used today was developed and improved on the basis of the slide projector in the 19th century.
After world war II, mankind ushered in the third scientific and technological revolution, the invention of the computer, a large number of integrated circuits, also make the projector into the digital age.
In 1989, Epson and SONY possessed the core technology of LCD panel.
In the same year, Epson's vpl-2000, the world's first LCD projector, was born, setting off a wave of LCD in the projection industry. Barco, Toshiba, Kogi, Benq have launched their own projection of new products, for a time, the projection industry.
Evolution of projector technology:
1. CRT Projection Technology
CRT projectors date back to the 1950s, when they were mainly used for video playback on business jets.
In the 1980s, the rapid development of personal computers increased the market demand for text and data display, which promoted the rapid development of CRT projection technology. The application of projection technology began to permeate conference rooms, teachers and theaters. In the mid and late 1980s, with the wide application of computer workstations and graphics processing software, graphics projectors capable of projecting high-resolution graphics and animations were produced accordingly.
In 1989, the first LCD projector was introduced, ending the situation that only CRT technology existed in the projector market. In 1994, the home projection market began to sprout, and CRT projectors were more mature than LCD projectors at that time, so they began to enter high-end home theater.
But in 1996 3LCD technology launched, the first DLP projector
was born, CRT projection technology began to decline, and quickly faded from people's sight.
2. LCD technology
It has long been customary to think that LCD technology was invented in Japan.
In 1888, the Australian botanist f. Reinitzer first discovered the existence of liquid crystals, or liquid crystals, and opened the door to fundamental research and development.
In 1968, American scientist g.h. Meier of RCA company made Liquid Crystal Display (LCD) based on dynamic scattering effect, forming the prototype of LCD industry. However, he never commercialized this technology.
Until 1973, sharp successfully developed calculators and watches with LCD technology as display panel, and led many manufacturers such as Hitachi, NEC, Toshiba to join the ranks of LCD product development and production.
Epson applied LCD technology to projection equipment, which USES liquid crystal arrays to change with the action of electrodes so that the light source through the LCD chip projects an image through the lens.
Epson vjp-2000, born in 1989, was the world's first LCD projector. Despite being the latest technology at the time, LCD projectors were still based on a single chip structure with poor performance and color, extremely low opening rate and resolution. It was not until 1995 that the single-chip LCD projector was officially put into the market, followed by the introduction of 3LCD technology in 1996, which made a breakthrough in terms of stability and color performance. SONY joined the effort to develop LCD chips, but in 2004 announced that it would no longer supply them for external use, only for internal use. So far, LCD projection technology by Epson and SONY monopoly.
From the original D1 generation chip to the D6 generation htps-lcd chip, Epson LCD projection technology has experienced more than a decade of development, and a one-step market for 10 years, until 2003 when DLP projector came from behind, the two-point world situation was formed.
Faced with DLP's potential to catch fire, Epson, Fujitsu, Hitachi, Panasonic, and SONY established the "3LCD" alliance in early 2005 to strengthen cooperation in technology development and product promotion, so as to maintain its dominant position in the market.
3. DLP technology
In 1987, Dr. Larry Hornbeck of Texas instruments developed the first digital microscope device (DMD). By 1996, Digital Light Processing (DLP) technology was commercialized to the projection display market, and the first DLP projector was launched, only 7 years later than LCD projector.
At the heart of DLP technology is a system of digital microscopes made up of tens of thousands of tiny, chained lenses that tilt back and forth along the light source, reflecting shades of gray, either bright or dark, through a color wheel filter that projects a colorful image.
The original prototype DLP chips had a resolution of only 16×16, and early DLP projector
s were only 300 lumens bright, meaning they could only be seen in darker environments. Nevertheless, the two differentiated market strategies of DLP technology still play a good guiding role in its technological development and quickly occupy the market, bringing great pressure to LCD projection technology.
One is the "portability" strategy. From the beginning, DLP projectors have come to the advantage of "portability". Although the standard weight of early DLP projectors was 10.5 kg, compared with LCD projectors of the same period, they were relatively light.
in the early in the market, it is with this advantage, only 6 pounds from 1997 In Focus LP420 by 2005 Samsung's pocket projector, DLP projector constantly introducing new refresh the concept of "portable", sweeping have eagerly demand for mobile business market, thus the foothold in the market, and for the first time in 2006 had more than fifty percent market share in the global market, tied with LCD technology.
The second is high-end strategy. Three-piece DLP projector is applied to high-end engineering and cinema projects, making up the technical gap of high resolution and high stability that LCD projector cannot solve in the past.
4. LCOS technology
The growing market is dominated by Texas instruments, Epson and SONY's DLP and LCD projection technologies. Other hungry firms are working hard to come up with new technologies to break monopolies.
LCOS technology was studied in 1995. Soon JVC developed LCOS patent technology known as D-ILA, and introduced the world's first LCOS projector at INFOCOMM exhibition in 1999.
LCOS is called Liquid Crystal on Silicon.
It is not hard to see that this is a technology developed from LCD. In fact, LCOS technology can be regarded as an improved technology that takes the advantages of LCD and DLP.
Its basic principles are similar to LCD technology, but the difference is that it utilizes a reflective architecture similar to DLP.
Next, let's talk about the development of projector light source.
There are three kinds of projector light sources commonly used: traditional bulb light source, LED light source and laser light source. In recent years, the development of the domestic projection market is more and more diversified, such as business, office, cultural entertainment, education and training, household, etc., many markets are demanding more and more projection equipment parts and more consumables.
For projectors, the projection light source is the largest consumable material. Below will explain in detail these three kinds of projector light source difference.
Traditional projector light bulb light source has not been eliminated after so many years, what benefits does it have? Now the projector bulb light source has several kinds, the metal halogen lamp's price is low, the life is short, generally not more than 2000 hours, and use the brightness of the bulb after 1000 hours will decay almost half, now has gradually dropped out of the projection bulb ranks. The price of UHE lamp is moderate. It belongs to a kind of ultra-high pressure mercury lamp. Its life is about 4000 hours. However, the price of UHP mercury lamp is a little higher, but it has high brightness and long service life, and it is mostly used for higher-end projection products.
Now UHP lamp is frequently used in home projection products and commercial projection products, and its usage is getting higher and higher.
1. LED light source
In recent years, the development of the LED light source is more and more mature, the price also is more and more low, in respect of the projector, the LED lights in the main meaning is that offers a new way for the fuselage miniaturization, its portability and simple operating system to make it to compensate for the loss of the traditional projector can't do, the LED light source of the projector freer, more with you.
In terms of lighting, the biggest advantage of LED projector compared with traditional bulb light source lies in its durability. The service life of LED light source is more than 20,000 hours, which is about 10 times of that of traditional projector.
It can be said that the projection equipment using LED light source can be basically realized in the use of several years without changing the light source.
The light color produced by the projection of LED light source is pure and the color saturation is higher than that of bulb light source.
And the brightness of the LED light source lies in the weakness of it with the traditional light source has a certain gap, which is why the main reason for the LED light can't replace the light bulb light, and to increase the brightness of the LED light source is to increase the volume of LED lights, and thus lose the LED light source light the advantages of small volume and increase the heat dissipation will become a difficult problem.
However, in general, LED light source is still a projection light source with great development potential.
2. Laser light source
Laser is a kind of light source which USES photoelectric effect to make excited particles glow under the action of stimulated radiation.
The laser light source is completely different from the light source of light bulb and LED. First of all, the color of laser is very pure. Its monochromatism is more than 10 times higher than the light source of ordinary light source.
This makes the projection equipment of laser light source far more capable of color expression than bulb light source, with strong stability and long-term use, the picture quality will also maintain high brightness, color saturation and contrast, and the picture color is always the same.
In addition, the laser in the brightness performance is also very excellent, by increasing the number of lasers, you can easily laser projector single light flux reached 10,000-50,000 lumens or even higher, and the service life of the light source is still very high, can realize the projection equipment in the service life without changing the light source.
Laser light source in color performance and brightness, life is very good, but the cost of laser light source is relatively high, laser projector can only appear in the high-end market, is also the main reason why the laser projector does not occupy a large share of the market.
Generally speaking, the three kinds of projector light sources have their own advantages. The bulb light source, due to its mature development, easy replacement and high brightness, occupies a place in today's projection market, but its future development prospects are general.
LED light source light and durability make it widely used in the micro projection and household projection market.
But the laser light source has shown the very strong strength in the performance and the stability degree.
Among the three kinds of light sources, laser light source has greater development potential and better performance.
In the future projection market, laser light source is likely to become the main force of projection light source.
In the field of commercial display, LCD splicing technology, small-spacing LED large-screen technology and laser large-screen display technology have been used in various commercial scenarios for a long time.
However, with the rapid arrival of the age of big data, artificial intelligence and Internet of things, commercial display screens have higher requirements for display effects.
For example, for the display of massive data, commercial display screens in the future are required to achieve seamless large picture and higher resolution display effects.
At the same time, as a productivity tool of commercial office, government departments at all levels and commercial enterprises, as users, also put forward increasingly stringent requirements on commercial big screen in terms of marginal cost and user friendliness.
Seamless laser large screen, in recent years, the laser projector continues to mature as the light source core, laser projector
laser light source with wavelength selectivity and high spectral brightness characteristics, can synthesize the human eye to see more than 90% of the natural color gammin coverage, achieve perfect color reduction.
In the meantime, laser illuminant has ultrahigh brightness, downy not dazzling appreciate experience。
In practical application scenarios, these technical advantages are important guarantees for mass data demonstration and fine HD demonstration in the era of big data and Internet of things.
From the current market situation and prospects analysis, the laser light source projector is slowly towards our life, and the speed of development should not be underestimated.
The laser light source projector has higher brightness and life up to 20,000 hours, from these two advantages alone, can bring more reliable use to the user.
The laser light source of the projector is more energy-saving, the later maintenance workload will be greatly reduced.
So the laser light source projector is in the state of continuous development, the future development trend is immeasurable.