HOLD! What’s the difference between smart projection, pico projector, and traditional projector
Smart projection
refers to the projector that has added wireless wifi Internet access function and is equipped with an intelligent operating system and has an independent UI interface. It is more common to carry an intelligent operating system in mini projectors. Android is the earliest intelligent operating system used in this series of products. operating system.
Smart projectors are very different from traditional projectors in appearance and operation. Not only can you use the body buttons (physical buttons or physical buttons) You can also use the mouse or keyboard to operate. However, traditional projectors use closed operating systems developed by the manufacturers themselves, which can achieve very limited functions and do not have the scalability similar to smart projectors. If the biggest benefit brought by the pico projector to the projector market is the unprecedented improvement of portability, then the revolution brought by the smart projector is in the user experience. Consumers can watch movies without using the AV cables, VGA cables, and HDMI high-definition cables of ordinary projectors. Even we can directly surf the Internet without connecting external devices. Only a power box is enough.
Intelligent projector is equivalent to a computer plus a portable projector, which greatly improves the user’s experience, which will be the development trend of micro projectors in the future. [Top Ten Smart Home Brands>>]
Pico Projector
Also known as pocket projection; pico projectors make the traditional huge projectors compact, portable, miniaturized, entertaining and practical, making projection technology closer to life and entertainment. It has the functions of business office, teaching, business travel, and replacing TV. The main working principle of the projector is that the light source emits light. Through a series of optical lighting systems, the light of the light source is evenly illuminated on the display chip, and the signal is passed through the circuit system to realize the color scale and gray scale on the display chip. The image on the display chip is enlarged and projected on the corresponding screen by the projection lens at the front end of the projection. In the projection system, optics are mainly divided into imaging optics and illumination optics, and the most critical components are display chips and lighting components (ie light sources).
Traditional projector
Also known as a projector, a A device that can project images or videos onto the screen, and can connect with computers, VCDs, DVDs, BDs, game consoles, DVs, etc. to play corresponding video signals through different interfaces. Projectors are widely used in homes, offices, schools and entertainment places. According to different working methods, there are different types such as CRT, LCD, DLP, etc.
Traditional projectors are divided into the following types
1, home theater type
Its characteristics are that the brightness is around 2000 lumens (with the development of projection, this number is increasing, and the contrast is higher), the aspect ratio of the projected picture is mostly 16:9, and various video Complete with ports for movies and HDTVs, it is suitable for home users.
2, Portable business projectors
Generally, projectors weighing less than 2 kg are defined as business portable projectors A projector, this weight is comparable to a thin and light laptop. The advantages of business portable projectors are small size, light weight and strong mobility. They are a substitute for traditional slide projectors and large and medium-sized projectors. The first choice for mobile business presentations.
3, educational conference projector
Generally positioned in school and enterprise applications, using mainstream resolution, brightness At about 2000-3000 lumens, the weight is moderate, the heat dissipation and dustproof are better, suitable for installation and short-distance movement, the functional interface is relatively rich, easy to maintain, and the cost performance is relatively high, suitable for mass purchase and popular use.
4, mainstream engineering projectors
Compared with the mainstream ordinary projectors, the projection of engineering projectors It has a larger area, longer distance, high brightness, and generally supports multi-bulb mode, which can better cope with large-scale and changeable installation environments, and is suitable for education, media and government fields.
5. Professional Theater Projector
This type of projector pays more attention to stability and emphasizes low failure rate, and its heat dissipation The performance, network functions, and ease of use of the projector are very strong. Of course, in order to adapt to various professional applications, the main feature of the projector is its high brightness, which can generally reach more than 5,000 lumens, and the highest can exceed 10,000 lumens. Due to its large size and heavy weight, it is usually used for special purposes, such as theaters, museums, assembly halls, public areas, and can also be used in environments such as monitoring traffic, public security command centers, firefighting and air traffic control centers.
6, measuring projector
This type of projector is different from the above types of projectors, and it was called contour projector in the early days , With the popularization of grating rulers, projectors are equipped with high-precision grating rulers, which are also called measuring projectors (or projectors, such as the CPJ-3015 produced by Gaocheng Company, a well-known measuring projector in China). In order to distinguish it from conventional projectors, such projectors are called measuring projectors. Its function is mainly to form an enlarged projector through the transmission of light, and then use a standard film or a grating ruler to determine the size of the product. Due to the development of industrialization, this measuring projector has become one of the most commonly used inspection instruments in the manufacturing industry. Projection on schedule is divided into vertical projectors and horizontal projectors. According to their comparison standards, they are divided into contour projectors and digital projectors.
Traditional projectors generally have the following two projection methods
LCDprojector
LCD (Liquid Crystal Display) liquid crystal projector can be divided into liquid crystal panel projector and liquid crystal light valve projector, the former is the main product in the projector market. Liquid crystal is a substance between liquid and solid. It does not emit light by itself, and its working properties are greatly affected by temperature. Its working temperature is -55℃～+77℃. The projector uses the photoelectric effect of liquid crystal, that is, the arrangement of liquid crystal molecules changes under the action of the electric field, which affects the light transmittance or reflectivity of the liquid crystal cell projector, thereby affecting its optical properties, resulting in different gray levels and colors. image. LCD projectors are the mainstream products in the projector market because of their good color reproduction, resolution up to the SXGA standard, small size, light weight, and easy portability. According to the number of LCD panels, LCD projectors are divided into three-chip computers and single-chip computers, while the models of single-board projectors are very few, and the most we see are three-chip computers.
There are 3 LCD panels in the projector, in which the liquid crystals are distributed. Liquid crystals are substances between liquids and solids. They do not emit light by themselves. They are arranged neatly like pixels on a fluorescent screen. The projector uses the photoelectric effect of liquid crystal, that is, the arrangement of the liquid crystal molecules and the state of the liquid crystal molecules themselves change under the action of the electric field, which affects the light transmittance or reflectivity of the liquid crystal cell. Using this principle, the projector can achieve the purpose of accurately controlling the light passing through the liquid crystal cell using electrical signals. The light source in the liquid crystal projector is a metal halide lamp or UHP (cold light source), which emits bright white light, which is decomposed into RGB (red, green, blue) three element colors through the beam splitter in the optical path system. The light of the three elements of RGB passes through the liquid crystal at a precise position. At this time, each liquid crystal acts like a light valve, controlling whether the light passes through each liquid crystal and how much light passes through. In this way, the light of the three element colors is accurately projected onto the screen through the lens of the projector, and the color of the point and the intensity of the light are all distributed just right. In this way, a colorful image that matches the source image is projected on the screen. Ordinary LCD projectors have many advantages such as good color, price advantage and good brightness uniformity. Therefore, they are gradually popularizing in households and small commercial places at a price of 10,000 yuan or even less than 10,000 yuan.
In addition, there are also liquid crystal light valve projectors, which represent the high-end products of liquid crystal projectors. It uses CRT tubes and liquid crystal light valves as imaging devices, and is the product of the combination of CRT projectors and liquid crystals and light valves. With very high brightness and resolution, it is suitable for occasions with strong ambient light and large projection screens, such as super-large command centers, conference centers or entertainment venues.
DLPProjector
DLP is the abbreviation of Digital Light Processor in English, translated as Digital Light Processor. DLP uses DMD (Digital Micromirror Device) digital micro-reflector as the light valve imaging device. A DLP computer board consists of an analog-to-digital decoder, a memory chip, an image processor and several digital signal processors (DSP). All text images pass through this board to generate a digital signal. To the heart of the DLP system – DMD. After passing through a high-speed rotating trichromatic lens, the light beam is projected on the DMD, and then projected on the large screen through the optical lens to complete the image projection. A DMD is formed by a number of tiny square mirrors (referred to as micromirrors) closely arranged in rows and columns and attached to the electronic nodes of a silicon wafer. Each micromirror corresponds to a pixel that generates an image. Therefore, the number of micromirrors of the DMD device determines the physical resolution of a DLP projector. For example, the resolution of a projector is 600X800, which means that the number of micromirrors on the DMD device is 600×800=480000.
In the DMD device, each micromirror corresponds to a memory, which can control the micromirror to switch and rotate at two positions at an angle of ±10 degrees. Moreover, the area of each pixel on the DMD block is 16 μm×16, and the interval is 1 μm. According to the number of pieces of DMD used, DLP projectors can be divided into: single-chip, two-chip, three-chip. The red, green and blue of the DMD digital signal are rotated in sequence, and the small mirror is turned on or off according to the position of the pixel and the number of colors. At this time, DLP can be regarded as a simple optical path system consisting of only one light source and a set of projection lenses. The lens enlarges The reflected image of the DMD is projected directly on the screen, so that a vivid and bright presentation effect is displayed in front of us.
Summary:
In one sentence, these three types of projectors are smart projectors, which are projectors with their own operating system like mobile phones, but insufficient projectors Brightness and image effects need to be improved; traditional projectors have certain requirements for curtains and wires, and are the best projectors among these three types of projection effects; the last type is pico projectors, which are undoubtedly small and convenient to carry. , but the tragedy is that the projection effect can be regarded as the worst of all projectors, after all, he is still young! Brightness and image effects are not that refined yet!
