DLP optical display TV
In the high-end color TV market, high-definition, large screens, and flat-panel structures have become the main pursuit of products. Plasma and liquid crystal display technologies are the two main technologies to realize the "flat panelization" of TVs. In recent years, another flat-panel color TV technology product-DLP optical display TV has appeared on the market. This article will give a brief introduction to this new display technology and products.
1. DLP optical display TV is a type of rear projection color TV
The core of the DLP optical display TV is the DMD chip. This chip, which is only the size of a matchbox, is densely arranged with 800,000 to 1 million small mirrors, and each small mirror can be flipped independently by 10 degrees in the positive and negative directions, and can Flip more than 5000 times per second. The light source is reflected on the screen through these small mirrors to directly form an image. Therefore, the DLP projection technology has abandoned the traditional optical convergence, and the focus can be changed at will. It is very convenient to adjust, and its optical path is quite simple and the volume is smaller. Therefore, the body of the DLP rear projection TV can be made thinner accordingly. The volume is no longer huge, greatly reducing the space for placement, and the energy consumption is also reduced a lot. From the price point of view, the popular single-chip DMD technology in DLP is also more affordable than ordinary LCD users.
From the display principle, DLP optical display TV should belong to a type of rear projection color TV, but it is different from the familiar CRT (cathode ray tube) and LCD (liquid crystal) rear projection, and can be made similar to a flat-screen TV Large screen and ultra-thin structure.
2. Performance and price comparison
Contrast:
DLP digital light display TVs have excellent performance in the three major factors (clearness, brightness, contrast) that constitute image expression. Generally, DLP digital light display TVs have a contrast ratio of 1500: 1 or even 2500: 1, and plasma is generally between Between 1000: 1 and 3000: 1, very few high ones have reached more than 5000: 1; DLP rear projection image resolution can generally reach 1260 × 720, which is equivalent to the resolution of LCD screen, which means that it is fully adapted to digital TV signals Requirements for TV imaging.
thickness:
DLP digital light display TVs can be made very thin, similar to flat-panel TVs (plasma, LCD). Generally, the thickness of CRT rear projection is more than 50CM, and the thickness of Samsung DLP digital optical display TV is below 40CM. Therefore, ultra-thin DLP digital optical display TV is also called "hangable rear projection", but most DLP rear projections on the market are currently Can not be hung, but they are also looking for their own characteristics. For example, the two products SP-56 (50) L7HR that Samsung is about to launch have a very good design. The integrated design of the bracket does not hang the decoration effect, and other It won't take up too much space; and most optical display TVs still follow the traditional rear projection shape, large screens increase the speakers. According to industry insiders, this design has a better sound due to the large space of the audio part.
At present, the TCLDLP61V6 launched by TCL has a 61-inch large screen, but due to the use of TCL-Thomson ’s advanced optical design, the thickness is only 1/3 of the ordinary DLP rear projection, and the thickness of the fuselage is only 17.4 cm. The thinnest rear projection TV in the world. The weight of the whole machine with pendant is less than 59 kg, which is lighter than ordinary 34-inch color TV. TCLDLP61V6 can be installed on the wall completely, so it is called "rear projection that can be hung".
brightness:
In terms of brightness, from the actual performance point of view, the general DLP rear projection is indeed lower than the plasma TV. The current mainstream plasma rear projection brightness is 1000cd / ㎡, while the DLP rear projection is about 750cd / ㎡. The plasma is indeed much brighter, and the DLP rear projection seems too dark. However, this cannot be considered as a disadvantage of the light display TV, because the indoor environment is generally dark, and the brightness above 500cd / ㎡ is enough. The brightness of 750cd / ㎡ can certainly meet the needs of most families. Plasma is better for display screens in bright places.
Service life:
TCLDLP61V6 uses the third generation DMD chip, its life span is up to 50 years, ten times that of liquid crystal, and the life of high-performance PHILIPS UHP bulb is up to 10000 hours. In 2002, Texas Instruments purchased 2 DLP and 5 LCD projectors on the US market and commissioned a third-party laboratory MCSL for life evaluation. The MCSL laboratory played continuously 24 hours a day for 7 days. The final test result is: after the LCD rear projection continues to play for a period of time, the picture will begin to turn green and blue gradually disappears. This is an inevitable aging phenomenon of LCD panels, while DLP is There is no aging; the LCD panel of the LCD rear projection will be affected by temperature, and it has problems such as slow response speed, tailing, and narrow viewing angle. This is also not seen on the DLP light display; the image quality of the LCD rear projection is far less than the DLP Delicate, the "grid" is more obvious; DLP optical display TV has a DMD chip life of up to 50 years, which is even beyond the reach of LCD rear projection. International consumer electronics giant Samsung recently announced that it will cease production of LCD rear projections and fully invest in the production of DLP optical display TVs.
price:
In the prosperous pattern of the high-end color TV market, whether DLP can call the plasma and LCD color TVs that are in the limelight has become the most concerned topic in the industry. Some people say that DLP light currently DLP light display TV has overcome several major problems such as not being able to make a large screen, insufficient brightness, lamp life problems, and low resolution, etc., and the technology is relatively stable. So the most important issue now is only the price. If the price is high, the DLP optical display is quite competitive. It is only the core component of DLP-the production technology of digital micromirror chip (DMD) is monopolized by Texas Instruments. All DLP manufacturers in the world buy its chips, and purchase optical machines and display screens from other upstream manufacturers. The parts are assembled, so the patent transfer fee for the core technology is a deep ditch that DLP must cross before reaching its peak of success in the future.
3. Comprehensive comparison of various TV display technologies:
Color reproduction-how realistic is the color?
LCD color reproduction has a certain degree of exaggeration, and the black purity is not high
Plasma red shows orange
LCoS true color, but lacks the uniformity of the whole screen
DLP true color reproduction
Contrast-Do the dark and light parts of the picture have good resolution?
LCD contrast is low
Plasma has good contrast
LCoS low contrast
Excellent DLP contrast
Reliability-How does the TV perform after many years of purchase?
LCD panel and polarizer will deteriorate during use
Plasma screen is easy to aging, the phosphor will "burn out" after long time use
LCoS Part of LCoS implementaTIons will have the same problem as LCD
DLP long-term use performance will not deteriorate
Image quality-is it possible to maintain the picture quality at the time of purchase?
Long-term use of LCD, three-layer design may produce displacement
Plasma RGB color and brightness change due to phosphor aging
The aging of LCoS panel and polarizer is easy to cause misfocus
DLP single layer design keeps the picture uniform and realistic
Price-How much does it cost to buy this technology product?
LCD affordable
Plasma large screen products are very expensive
LCoS expensive
DLP affordable and cost-effective
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