[Home Theater Network HDAV.com.cn] For each of our home theater players, the existence of the projector is crucial. As far as the current projector market is concerned, DLP, LCD and LCoS are undoubtedly in the mainstream. Who are good and who are bad? What are the advantages and disadvantages of each? Here, we compare them through different aspects.
The first is DLP projection technology.
DLP (Digital Light Processing), which is digital light processing, means that the technology first digitally processes the image signal and then projects the light. It is based on DMD (Digital Micromirror Device) to complete the display of visual digital information.
The principle is to pass the cold light source emitted by the UHP bulb through the condensing lens, homogenize the light through the Rod (light rod), and the processed light passes through a Color Wheel to separate the light into RGB three colors (or RGBW). For more colors, some manufacturers use BSV LCD splicing technology to filter light transmission, then cast the color on the DMD chip, and finally reflect it on the projection screen through the projection lens.
For example, the products that we usually see from Optoma, BenQ, Mitsubishi, and other projector manufacturers use this technology.
Optoma GT1080
Followed by LCD projection technology
LCD (Liquid Crystal Display), liquid crystal display is a combination of liquid crystal display technology and projection technology. It utilizes the electro-optical effect of liquid crystal, and controls the transmittance and reflectivity of the liquid crystal cell through the circuit, thereby generating different gray levels and more. A beautiful image of 16.7 million colors. The main imaging device of an LCD projector is a liquid crystal panel. The size of the LCD projector depends on the size of the liquid crystal panel. The smaller the liquid crystal panel, the smaller the volume of the projector.
LCD projectors can be divided into single-chip and three-piece types according to the number of internal liquid crystal panels. Modern LCD projectors mostly use 3-chip LCD panels. The three-chip LCD projector uses three liquid crystal panels of red, green and blue as control layers for red, green and blue light respectively. LCD projectors account for more than 70% of the total market share, and are the most widely used and widely used projectors in the market, ranging in price from a few thousand to tens of thousands.
For example, Epson (Epson), Panasonic (Panasonic) and other projector products use this technology.
Epson (Epson) TW-5350
Finally, LCoS projection technology
LCoS (Liquid Crystal on Silicon), which is a liquid crystal with silicon, also called silicon-based liquid crystal, is a matrix liquid crystal display device based on a reflection mode and having a very small size. It is a new type of reflective micro LCD projection technology. The structure is a long transistor on a germanium wafer. The driver panel (also known as CMOS-LCD) is fabricated by a semiconductor process, and then polished on the transistor by grinding technology. The aluminum plate is plated as a mirror to form a CMOS substrate, and then the CMOS substrate is bonded to the glass substrate including the transparent electrode, and then the liquid crystal is drawn into the package for testing.
Simply put, LCOS is directly related to the image tube (CRT) projection technology, Ploy-Si LCD penetrating projection technology, DMD digital optical processing reflective technology. These three technologies have matured, but LCoS has become the new mainstream of projection display technology.
This technology is often used in projectors from Sony and JVC in Japan. However, Sony calls it SXRD technology, and JVC calls it D-ILA technology, all of which have changed in the original LCoS.
Sony VPL-VW1100ES SXRD 3D/4K projector
JVC D-ILA X7000
Below, let's compare the advantages and disadvantages of the three:
1, contrast
Champion: LCoS
Runner-up: DLP
Third place: LCD
Contrast is an important reference factor for image quality. For now, JVC's D-ILA projector is the best contrast projector I've seen in the past year, followed by Sony's SXRD projector, which is born out of LCoS technology.
LCD projection technology has been improved in recent years, and the contrast has been significantly improved, but there is still a certain distance compared to LCoS.
However, DLP hasn't changed much in recent years, stopping, falling behind LCoS and LCD.
2, black level
Champion: LCoS
Runner-up: DLP
Third place: LCD
The black level extension circuit is an important circuit used by large-screen color TVs to improve image quality. It has a lot to do with contrast, so the result naturally continues the comparison of contrast. JVC's D-ILA Sony's SXRD has a high contrast ratio, and they can appear brighter black or white at the same time.
3, brightness
Champion: LCD and DLP
Runner-up: LCoS
This aspect is not a good comparison because its light output varies greatly from projector to projector. As far as the results I have tested, LCD and DLP are slightly better. However, it is worth noting that the improvement of LCoS projectors in recent years is quite obvious.
4, color
Result: Draw
It's hard to say which kind of technology makes the projector's color performance better and more accurate. The key is to look at the manufacturer's intention.
5, motion blur
Champion: DLP
Runner-up: LCD and LCoS
In this regard, LCD and LCoS have more or less certain problems, and many people will ignore this problem, but there are always people who pay attention. During fast motion, DLP is updated to be clear and detailed, and this does not compensate for its lack of contrast.
6, rainbow phenomenon
Champion: LCD and LCoS
Runner-up: DLP
As far as past experience is concerned, DLP projectors have a relatively obvious rainbow phenomenon, especially in the dark background, which has a great relationship with the imaging principle of DLP projectors. However, many friends will not necessarily notice this problem, or even if they notice it, they will feel that it has no effect. Indeed, it is only a minor problem.
7, Convergence function
Champion: single chip DLP
Runner-up: three-chip DLP, LCD, LCoS
The chips used in each projector are small, and a little bit of change in position can produce different results on the screen. For example, if it is not set, sometimes white patches will be seen on the edges of the color, and the imaging is not accurate enough. Whether it is a three-chip DLP, an LCD, or an LCoS, there are more or less such problems, which is inevitable.
to sum up:
Although in some respects, LCoS is stronger than DLP and LCD, or LCD is stronger than LCoS and DLP, it can only have its own advantages. In fact, we have seen that these three technologies in the market have excellent representative works, such as LCOS with Sony and JVC, LCD with Epson (Epson), and DLP with BenQ (BenQ), which are deeply loved and respected by users.
Of course, their different characteristics also determine that they are suitable for different scenarios or environments. So, before you buy a projector, the first thing you need to understand is what you want to do with it.
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