In the current projector industry, when it comes to projector technology, I believe everyone will talk about 3LCD and DLP projection technologies. From the current projector market, these two technologies are the most widely used projection technology. Projector products for large projection technology applications have been formed in two major market segments, and related projector brand manufacturers are applying these two projection technologies. Among them, 3LCD technology is represented by Epson and other manufacturers, and DLP technology is represented by BenQ and other manufacturers.
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Then, the same projector product application, the core technology of the application is different, what is the difference? What kind of projection products can these two projection technologies bring to our users? We will pass this The analysis of the advantages and disadvantages of the two major projection technologies helps everyone understand and compare the advantages and differences between the two technologies.
Interpretation of two major projection techniques
The two major technologies currently projected are 3LCD (Liquid Crystal Display) and DLP (Digital Light Processing). LCD and DLP projection technologies are divided into single-chip and three-chip. LCD projection technology is currently based on three-chip (so widely referred to as 3LCD technology in the industry), DLP is the most common single-chip, three-chip DLP projection technology is often used in expensive high-end applications such as the Digital Theater. Projection TVs can be divided into front projection displays (Front Projection Display) and rear projection displays (Rear Projection Display) depending on the projection direction.
Among the two projection technologies, 3LCD is the earliest development, and its technology is very mature. The rendered picture effect and color saturation are very satisfactory. Therefore, 3LCD projector is very suitable for colorful images and dynamic images. Output. With the development of the projection market, a large number of business applications have also accelerated the breakthrough of the projector in miniaturization and high brightness (the main products of promotional products), so many portable projectors were also introduced in 2002.
In 2004, the global market share of commercial and home projectors based on Texas Instruments DLP projection technology also exceeded 47%, almost regardless of the market share of the 3LCD camp. According to data from the Japanese market research organization TSR, DLP products shipped more than 2.6 million units in 2004, while Pacific Media Association (PMA) also reported that DLP products increased their market share in the third quarter of 2004. %, increased to 14% in the fourth quarter. In terms of product share, the market share of 3LCD and DLP products in 2004 was 53% and 47%, respectively. Judging from the almost equal share of autumn, the two camps are relatively close to each other. In today's 3LCD projection technology is still evolving, improving the final application level of projection products, including screen effects, colors, etc. Of course, DLP projection technology products continue to play their own advantages, and continue to break through in many fields. , enhance and evolve the application of products.
Analysis of the advantages and disadvantages of 3LCD projection technology
The best feeling that 3LCD projectors give us is "color charm", from the commonly used LCD monitors, LCD TVs, and mobile phone screens. I believe that everyone can already appreciate the charm of color. The reason why 3LCD projection can have superior color is inseparable from technical design. The three HTPSs are responsible for the red, green and blue of the video signal respectively. The imaging and color reproduction of the 3LCD technology is characterized by first mixing the three primary colors simultaneously and then projecting images of different colors, also called simultaneous space. Mixed reduction.
Each HTPS in a 3LCD projector contains tens of thousands (or even millions) of liquid crystals that can be configured to be turned on, off, or partially closed to allow light to pass through. Tens of thousands (or even millions) of liquid crystals work like shutters during normal work. When the red, green and blue colors pass through different HTPS panels, the liquid crystal is turned on and off in real time based on how much each color of the pixel needs to be at that moment. This behavior modulates the light to produce an image that is projected onto the screen. From the user's product experience, the image of the 3LCD projector looks more clear, the noise is relatively less, and the color reproduction is more accurate. In addition to excellent color, the 3LCD LCD projector with new technology also has a lens shift function, which is also the evolution of 3LCD projection technology in the application, adjustment is more convenient, and can provide users with a more humane experience.
Dustproof technology breakthrough application
In the development history of more than 20 years, 3LCD technology is also constantly developing, and the technology has been relatively mature, solving the problems of easy aging of the liquid crystal panel in the early stage. Although it has not been completely changed in some aspects (such as dustproof), the related technology has been upgraded several times, the performance of the product has been greatly improved, and the modern new dustproof technology is also being applied continuously. Apply dust-proof technology to specific environments to improve user application performance.
In the period of low aperture ratio, if you want to increase the brightness of the 3LCD projector, you must increase the power of the bulb. We know that the light and heat are interdependent, and the power and brightness of the bulb are increasing. To a certain extent, the damage of heat to HTPS is increased. HTPS is composed of high-temperature polysilicon, which has a long-term aging process at high temperatures. On the other hand, glass which is an HTPS substrate is prone to variation in optical properties when it is operated at a high temperature for a long period of time. In order to reduce the temperature of HTPS and slow down the aging speed, the optical engines of 3LCD liquid crystal projectors adopt an open structure layout, and the temperature of the chip is reduced by a fan. However, due to the existence of some suspended particles in the air, the dust will adhere to the liquid crystal panel while dissipating heat, which not only affects the light passing rate, but also reduces the heat dissipation efficiency of the chip, which fundamentally affects the picture effect and HTPS. life.
Many early adopters of 3LCD projectors will find that after a period of use, the 3LCD projector will be yellowish, mainly due to the influence of dust and aging of HTPS. However, due to the design principle, the 3LCD projector cannot achieve a sealed optical path design, and only work hard on dust. Especially in China, where air quality is worrying, manufacturers have adopted a double filter, a pleated filter, and multiple filters to reduce the rate of dust. From the actual experience, the redesigned filter does reduce the maintenance cycle, making the 3LCD projector simpler in terms of dust protection and lowering the workload for consumers.
Contrast decomposition
In terms of contrast, the contrast of the 3LCD relative to the DLP projector 2000:1, the mainstream 3LCD projector contrast is only between 500:1 - 700:1. The low contrast is mainly because the HTPS adopts a transmissive optical path, and the aperture ratio is only 75%. When the light passes through, there is a certain loss, and the degree of utilization is not high. Therefore, the black picture is not black enough, and the contrast of the picture is naturally biased. It is low. However, in order to solve this problem, 3LCD has developed the technology of "dynamic aperture". The latest Epson TW4500 (the lowest price of online shopping is 14980.0 yuan) has a dynamic contrast ratio of 200,000:1. In addition to the TW4500, projectors with a dynamic contrast ratio of 100,000:1 or more are basically covered by the 3LCD camp.
After 20 years of development, the 3LCD technology has matured and is able to meet the needs of most consumers. HTPS has now developed a 0.74 inch C2FINE inorganic alignment type liquid crystal panel. The panel has greatly improved the aperture ratio and light passing rate, and the heat resistance level has also been significantly improved. The service life of the liquid crystal panel can reach tens of thousands of hours. Users can use it for five or six years if they use it for 5 hours a day, and the projector industry will face new changes after five or six years.
Analysis of the advantages and disadvantages of DLP projection technology
DLP technology provides the clearest and brightest picture quality and is one of the most versatile display technologies on the market. As a fully digital display technology for reliability, the core of every DLP projection system is optical semiconductor, ie digital microscope device DMD Also known as the DLP chip, it was invented in 1987 by Dr. Larry Hornbeck of Texas Instruments.
The DLP chip is probably the most sophisticated optical switch in the world. It contains a matrix of up to 2 million micromirrors mounted on hinges, each smaller than one-fifth the size of a human hair. When the DLP chip is coordinated with a digital video or graphics signal, the source micromirror and projection lens can reflect the digital image onto a screen or other surface.
In terms of grayscale images, the DLP technology inputs the image bitstream code of the semiconductor device to control the on or off of the microscope, and the number of switching times can be several thousand times per second. When the microscope is turned on and off frequently, the lens reflects light gray pixels; the microscope in a normally closed state reflects dark gray pixels. In this way, the microscope in the DLP projection system can reflect a 1024 pixel shade of gray to convert the video or image signal of the input DLP chip into a layered grayscale image.
Monolithic DLP projection works
DLP technology TVs, home theaters, and commercial projectors are primarily single-chip configurations. The white light produced by the illuminator produces red, green, and blue light through the color wheel filter and sequentially strikes the DMD surface. The projection time of the microscope switch and "on" or "off" is tuned according to the color brightness, and the human eye mixes the continuously projected colors, so that the full-color image can be seen.
Three-chip DLP projection works
Professional-grade projectors, engineering machines and home machines with DLP technology are three-chip configuration, suitable for occasions where the picture quality or brightness is extremely high. The white light generated by the illumination light is divided into red, green and blue light through the prism, and each DLP The chip is responsible for one of the colors, and the colored light reflected by the microscope is combined to form an image through the projection lens.
Analysis of the advantages and disadvantages of single chip DLP
At the heart of DLP technology is a digital microscope device that modulates optical signals much faster than all other display devices. This means that most DLP projection systems use a single chip, which not only reduces manufacturing costs, but also makes the projection system smaller and lighter, while all other technologies require a three-chip design.
In all three-chip projection systems, each chip is responsible for processing each of the three primary colors of red, green, and blue. In theory, color reproduction will be more accurate, while single-chip DLP projection systems require color wheel filters for color reproduction. Color wheel design and algorithms play a key role in color performance.
Compared with other technologies, the digital feature of DLP technology is that the product is heat-resistant, free from environmental factors such as moisture or vibration, and the image will not fade due to long-term use of the device. Except for the projection bulb to be replaced by life, there are few other maintenance.
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