[Home Theater Network HDAV.com.cn] From the home theater projector familiar to audio and video players, to the recent laser TV, no-screen TV, and compact micro-projection, the new projector products have been riding intelligent hardware for two years. The tuyere began to take off. It is foreseeable that with the development of the film industry and intelligent hardware, the iteration of audio and video products will be faster and more fun. The author did his homework and found that although there are many types of projectors, there is no subversive improvement in projection technology. Laser TVs and screenless TVs are just the popularization of laser projection technology. Today, the author introduces you to the current mainstream projection technology, so that everyone has a deeper understanding of the projection products.
1, LCD projector
LCD (Liquid Crystal Display) liquid crystal is transmitted and reflected, and the liquid crystal is made into an LCD liquid crystal panel for use on an LCD projector. The LCD projector is divided into a liquid crystal panel and a liquid crystal light valve. The liquid crystal panel projector controls the transmittance and reflectance of the liquid crystal unit through a circuit, thereby generating images of different gray levels and colors. The liquid crystal panel projector can be divided into two types: single chip and three chip. The principle of the three LCD panel projector is that the optical system passes the strong light through the beam splitter to form RGB three beams, which are respectively transmitted through the RGB three color liquid crystal panel; After AD conversion, modulation is applied to the liquid crystal panel, and by controlling the opening and closing of the liquid crystal cell, thereby controlling the on and off of the optical path, the RGB light finally converges in the prism, and the projection lens projects on the screen to form a color image.
Single LCD:
Advantages: simple, reliable and inexpensive.
Disadvantages: low brightness, low technical indicators, large size, high noise
3LCD:
Advantages: high brightness, good color,
Disadvantages: low brightness, high cost, low contrast
3LCD projector working principle diagram
2, DLP digital projector
DLP (Digital Light Processor) technology uses the principle of reflected light to attach DMD (Digital Micromirror Device) to the SRAM, and controls the tilt angle of each mirror through electrodes to switch the direction of light reflection. . The core chip DMD used by DLP consists of hundreds of thousands of microlenses with an area of ​​16 x 16 microns that are smaller than the cross section of the hair. Each micromirror corresponds to one pixel, and the physical resolution of the DLP projector is determined by the number of micromirrors.
DLP projector working principle diagram
Single DLP:
Advantages: high brightness, small size, low cost, good contrast
Disadvantages: general color, fast decay of brightness
3DLP:
Advantages: good indicators, mainly used for engineering display
Disadvantages: cost is too high
3, LCOS projector
(Liquid Crystal on silicon) uses D-ILA (Direct-Drive Image Light Amplifier) ​​to directly drive the image source amplifier technology. The core component is a reflective active matrix silicon upper liquid crystal panel, also known as reflection. Liquid crystal panel. In the D-ILA technology, the liquid crystal panel uses a transistor as a pixel point liquid crystal switching control unit on a silicon substrate, and a silicon substrate (also called a reflective electrode layer) is located under the liquid crystal layer for various control of pixel address addressing. The insulating layer between the electrode and the electrode is located below the silicon substrate, so the entire structure is a 3D arrangement. Light from the light source cannot penetrate the reflective electrode layer and is reflected by the reflective electrode layer, avoiding the blocking of light by various structural layers below.
Single LCOS:
Advantages: simple, reliable and cheap
Disadvantages: low brightness, low technical indicators, poor color
3LCOS:
Advantages: good indicators, mainly for home or professional cinema
Disadvantages: cost is too high
4, CRT projector
CRT projectors are complicated to operate, especially the convergence adjustment is cumbersome, the body is large, and it is only suitable for installation in places where the ambient light is weak and relatively fixed, and it is not suitable for moving. Early AV fans must have known that the three-gun projector, CRT technology, has basically been eliminated.
The three-gun projector that the old fans are familiar with has its excellent black level and rich colors.
5, laser projector
At present, the more powerful laser TVs and screenless TVs are actually laser projectors. The only difference is that the former uses ultra-short-focus lenses. Laser TVs use a laser beam to transmit the picture. 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 laser is transmitted by the projection objective to the projection screen to complete the entire laser projector display process. .
After all, the laser TV will still affect the contrast and color when the projection environment is too bright.
Others include: 4LCD projectors, professional GLVs, etc. More fresh and fun home theater information, please pay attention to home theater network http:// (WeChat: cnhifi), the country's most influential home theater audio player interactive media website.
Note: This article is transferred from love video. Author: Advanced Editing overture. The article is an independent view of the author and does not represent the position of the home theater network.
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