A projector, also known as a projector, is a device that can project images or videos onto a screen. The following is an introduction to the imaging principles of projectors that I have collected. I hope it will be helpful to you.
Is there a difference between a projector and a projector?
A projector is directly connected to the computer and can directly convert the signal and project it on the screen. There are two technologies for projectors now. One is LCD (liquid crystal projector), which uses three liquid crystal panels to display images. The principle is that the light bulb emits light, the signal is loaded onto the liquid crystal chip, and the light passes through the liquid crystal chip for image presentation. Another technology called DLP (Digital Projector) principle relies on DMD digital micromirrors to display images. The former has good color reproduction. Both have high black and white contrast. If it is used for dynamic videos, use the former, and if it is for office documents, use the latter.
Projectors are rare nowadays. They are teaching instruments that can emit light through a light bulb and pass through prepared films to present images. The technology is simple. The cost is very low, similar to that of a film projector. As long as there are lights, light channels, and lenses, a projector can be made.
The biggest difference between a projector and a projector is that one can receive external signals and the other cannot.
Projector imaging principle
A projector consists of three main parts: core projection imaging components, optical engine, electrical control and interface. It is a projection used to amplify and display images or videos. Equipment is now widely used in four major areas: education, business, government, and home entertainment.
Projector imaging principle - basic principles
When it comes to projector imaging principles, they are basically the same. No matter which type of projector, the light is first divided into red The three colors of green and blue produce images of various colors. Because the element itself can only perform monochrome display, it must first generate three color components, then combine the three color images into one image through a prism, and then project it onto the screen through a lens.
The lens in the projector is equivalent to a convex lens. When the object is between twice the focal length and one focal length of the convex lens (2f>u>f), the light from the object on the projection film passes through the convex lens. Form an inverted, enlarged real image of an object. Finally, the propagation direction of the light is changed through a plane mirror so that it is imaged on the screen.
Projector imaging principle - DLP projection technology
DLP (Digital Light Processor) is translated as digital light processing. It is a patented technology of TI (Texas Instruments, USA). Through digital micromirrors The component DMD (Digital Micromirror Device) is used to display visual digital information.
The DMD chip is composed of hundreds of thousands or even millions of micromirrors. Each micromirror represents a pixel, and the on/off state of the micromirror represents the brightness or darkness of the pixel. The light source passes through the color wheel and is refracted on the DMD chip, and then projected on the large screen through the optical lens to complete the projection process.
Projector imaging principle - CRT projection technology
CRT (Cathode Ray Tube) is translated as cathode ray tube, including electron gun, deflection coil, shadow mask, phosphor layer and glass shell. It is the earliest and most widely used display technology. A projector using CRT is also called a three-gun projector. Its working principle is similar to that of a CRT monitor. Its light source and imaging are both CRT. The CRT projector decomposes the input signal signal on the fluorescent screen of three CRT tubes of red, green and blue through its own luminescence. The phosphors emit light, amplify and converge under the action of high voltage, and display a color image on the large screen.
Projector imaging principle - LCD projection technology
LCD (Liquid Crystal Display), translated as liquid crystal display, is one of the leading technologies in the projector market. The working principle of LCD is Liquid crystals are placed between two parallel pieces of glass. There are many small vertical and horizontal wires between the two pieces of glass. By energizing or not, the rod-shaped crystal molecules can be controlled to change direction and refract the light to create the picture.
LCD projectors are divided into two types: liquid crystal panels and liquid crystal light valves. LCD panel projectors use the electro-optical effect of liquid crystals to control the transmittance and reflectivity of the liquid crystal unit through circuits to produce different grayscales. Images with layers and millions of colors have higher brightness and color saturation than CRT projectors. Liquid crystal light valve projectors use CRT tubes and liquid crystal light valves as imaging devices. They are the product of a combination of CRT projectors and liquid crystal light valves. They are the projectors with the highest brightness and highest resolution so far.
Is there any difference between a projector and a projector? This concludes the introduction of the imaging principle of a projector. Is there anything else unclear? I hope it will be helpful to everyone.
Rules for using projectors
Projectors are relatively sophisticated audio-visual teaching equipment. In order to ensure the normal use of the equipment, extend its life and ensure the safety of its property, the usage regulations are as follows:
1. Each class should identify an audio-visual learning committee member, who will be put on record after being trained by the audio-visual education department. In the future, any problems involved in the use of the projector can be reported to the audio-visual education department by the audio-visual learning committee member for resolution.
2． When each class leader uses a projector, both the class teacher and the audio-visual learning committee must sign to clarify their responsibilities.
3. After receiving the projector (including chassis and screen), each class must educate students on how to protect school property. The preparation and storage for daily use are handled by the audio-visual learning committee. Other students are not allowed to mess with it at will.
4． Faults encountered in daily use will be reported to the audio-visual education department by the audio-visual education learning committee, and they will be solved after being identified by the audio-visual education department. Those who do not follow the operating procedures, throw them around, or play with them at will, causing damage, will be given a certain amount of punishment according to the circumstances. Punishment, repeated damage will be taken back if education fails.
Projector purchasing tips
1: BenQ projector
BenQ Dentsu was founded in 1984. At present, the complete layout of BenQ's six major business divisions - video, storage, imaging, digital display, wireless communications and broadband networks has become increasingly mature, and BenQ has also successfully transformed into an outstanding electronic communications company. From the PC (personal computer) market to the active expansion in the IA (information appliances) and Wireless (wireless communications) fields, BenQ has always laid out its plans calmly with a forward-looking vision.
2: Epson projector
Seiko Epson was founded in May 1942 and is headquartered in Suwa City, Nagano Prefecture, Japan. It is a global leader in the field of digital imaging. Epson Group enhances corporate value through a culture of innovation and creativity, and is committed to providing customers with innovative digital imaging technologies and solutions. Currently, it has production and R&D institutions in 32 countries and regions on five continents, and business and service outlets in 57 countries and regions.
Three: Acer Projector
Founded in 1976, Acer is the third largest personal computer brand and the second largest notebook computer supplier in the world. It has an internationally operating management team and adheres to the corporate philosophy of "innovation and care". It is mainly engaged in the research and development, design, marketing and services of its own brand of laptops, desktops, LCD monitors, servers and digital homes, and continues to provide global Consumer-friendly and reliable information products.
Four: Sony Projector
Sony Corporation (Sony Corporation) is a world-renowned electronic product manufacturer that spans the fields of digital, daily necessities, and entertainment. A world giant headquartered in Tokyo, Japan. Sony's predecessor was "Tokyo Communications Industry Co., Ltd.", which was founded in May 1946 by Akio Morita and Daiichi Ibuka. The current management team is co-led by Kazuo Hirai and Ryoharu Nakahachi. Sony is one of the world's leaders in the fields of consumer/professional audio-visual products, communication products and information technology. Its achievements in music, film and television and computer entertainment operations have also made it one of the world's largest integrated entertainment companies.
Five: NEC projector
NEC was founded on July 17, 1899. The founder was Kunihiko Iwataru. It was a joint venture with Western Electric (WE Company) in the United States. It is the earliest joint venture company in Japan.
After more than 100 years of development, NEC has become a well-known multinational company in the fields of IT, communications and semiconductors through its innovative spirit. In the future, we will follow the corporate foundation of innovation and bring more satisfactory products and services to users.
Six: Vivitek Projector
Vivitek was founded in California in 1991. It is a US-owned multinational high-tech enterprise group with R&D and sales institutions all over the Americas. , Europe, Asia-Pacific, China and other regions. Vivitek has many unique technologies in the world in the field of projection and large-screen display, including LED backlight high-definition projectors, 3-chip DLP projectors, high-lumen high-contrast professional engineering projectors, ultra-short throw high-definition projectors, etc.; and It has the closest cooperation and full support from the world's largest component factory and DLP core technology TI. It currently has multiple independent display research laboratories around the world.
7: Optoma Projector
Optoma is a world brand with deep roots in local markets and global presence. Since its establishment, it has focused on the R&D and sales of projection systems and is committed to image and color processing. Technology research and development, combined with complete product planning and flexible marketing strategies, ranks first in the sales ranking of DLP projectors in the United States, Canada, Mexico, Britain, France, Germany, and Taiwan
Eight: Cool LeTV Projector
< p> Shenzhen Kuleshi Technology Co., Ltd. is a young enterprise focusing on the research and development and promotion of digital imaging products. It was participated and initiated by Japan Weiyou Optoelectronics Co., Ltd. (Hong Kong) Co., Ltd., Sichuan Weiyou Technology Co., Ltd. and others. It was founded in 2009 Established in May. The company has inherited and carried forward the traditional advantages of the parent company in the field of projection photoelectric display (DLP technology, 3LCD technology, single LCD technology, etc.), and further focused on micro-displays driven by new lighting technologies such as LED (CF-LCOS, LCOS, DLP, MEMS) projection display field, the company not only has a large number of professional talents, modern advanced production technology and testing equipment, but also has more than ten years of design and production experience, rich skills and strong R&D strength in the field of projection machines.Nine: Panasonic projector
Panasonic in Chinese "Panasonic" (early called National, gradually changed to Panasonic starting in 1986, and all unified as Panasonic from October 1, 2008) is produced by Panasonic of Japan Electrical Appliances Industry Co., Ltd. was founded by Konosuke Matsushita in 1918. It has developed brand products covering home appliances, digital audio-visual electronics, office products, aviation and many other fields and has gained a global reputation. In addition, the accumulation of Panasonic's marketing culture has made the company's brand leap into the "World Brand 500" "Strong" rankings.
Ten: Hitachi Projector
HITACHI Hitachi Group is one of the world's largest comprehensive multinational groups. It came to China in the 1960s and became one of the few foreign-funded enterprises to enter the Chinese market early. one. The main products are air conditioners, refrigerators and other electrical appliances. The company will cut listing costs as its American depositary receipts trade sluggishly. Hitachi announced on March 30, 2012 that it would delist from the New York Stock Exchange and submitted a delisting application in mid-April.