The difference between dlp and lcd is only in the application process. thank you

First of all, we should know that the imaging methods are mainly divided into two camps, DLP and LCD. I believe most people also know that the contest between the two technology camps has a long history, and each has very loyal manufacturers to make their own different products. But the product line is too long to choose. Therefore, you must have a certain understanding of the projector in order to be aware of it. First, understand the difference between the two technologies:

Origin and development: the essential difference between DLP and LCD

Development status: DLP and LCD are equally divided.

Application guidance: DLP turns left, LCD turns right, and merchants have their own choices.

Origin and development: the essential difference between DLP and LCD

The origin of LCD: Sharp produced LCD in 1970s. Due to the development of CRT and over-skilled technology, LCD projectors are old-fashioned products in the market, but they really entered mass production in the mid-1990s. Thanks to the support of early established giants such as Epson and Sony and the pursuit of many other manufacturers, it has always been the leading product in the global projector market.

Working principle of LCD: The principle of this technology is to use the photoelectric effect and electric field of liquid crystal molecules to change the arrangement of liquid crystal molecules, so that the two changes of transmittance and reflectivity lead to changes in the optical characteristics of liquid crystal, and finally produce different gray or color images.

Advantages of LCD: The main advantage of LCD projector is that its three primary colors are composed of three independent LCD panels, and the brightness and contrast of each color are controlled separately, so the resolution can be higher and the picture layering is good. Moreover, because the projection mode of LCD is very mature so far, the synchronization level of three primary colors of light has also achieved satisfactory results, making LCD projectors more suitable for the projection output of dynamic pictures. But the most important thing is cheap.

Origin of DLP: In fact, however, DLP technology was originally a display technology developed by Texas Instruments Factory in the United States, originally for military operations, but for various reasons, it has actually become a civilian display device, and this technology is more favored by consumers who pursue video effects.

Working principle of DLP: DLP is the English abbreviation of Digital Light Processor, and the Chinese name is Digital Optical Processing Technology. This technology is a new idea in the field of projection and display information. DLP projector, as an all-digital reflective projection technology, takes DMD (digital micromirror device) digital micromirror as the imaging element to complete the final link of displaying numbers.

Advantages of DLP: Due to the high chip integration, DLP projection has an essential advantage in power consumption, and it is not easy to affect the image quality due to environmental factors such as high temperature, humidity and vibration. All-digital image processing can provide more flexible applications, whether watching TV, home theater, surfing the Internet, playing electronic games or browsing the images of digital cameras, it can be done through DLP projectors. Moreover, digital reflection projection technology can greatly improve the gray level of the image, make the image noise disappear, stabilize the image quality, and the image positioning is much more accurate than before, so the obtained image has higher contrast and is fuller. Moreover, this technology also uses reflective DMD devices, and the total optical efficiency of imaging devices has been greatly improved. At present, most DLP projectors on the market are single-chip projectors, which have outstanding color uniformity, and the effect is more prominent when projecting characters, CAD and slides. In addition, the DLP projector has a very high contrast, and can maintain a clear and sharp image even in the case of low brightness.

Comparison between DLP technology and LCD technology;

Contrast point DLP shadow technology LCD projection technology

Core technology: all-digital DDR DMD chip LCD panel

Imaging principle DLP projection principle is to project light onto DLP wafer through high-speed rotating red, blue and green wheels for reflection imaging. LCD uses optical projection to pass through red, green and blue filters, and then projects three primary colors through three liquid crystal panels to synthesize projection imaging.

Clear pixel gap is small, the picture is clear, and there is no flicker. The pixel gap is large, with mosaic phenomenon and slight flicker.

High brightness is average.

The filling amount of contrast light is as high as 90%, and the total light efficiency is more than 60%. The maximum light filling amount is about 70%, and the total light efficiency is more than 30%.

High color reproduction (digital imaging principle) is generally limited by digital-to-analog conversion.

The high gray scale (1024/ 10 bit) is not rich enough.

The colorless domain compensation circuit (Toshiba color gamut compensation circuit, which makes colors consistent) with color uniformity greater than 90% produces more and more serious color difference with the aging of LCD panels.

Brightness uniformity is more than 95% (Toshiba digital uniform transition compensation circuit makes the brightness in front of the screen more uniform). There is no compensation circuit, and there is a "solar effect"

Performance DLP chip adopts sealed package, which is less affected by the environment, has a service life of more than 20 years and high reliability. LCD liquid crystal materials are greatly influenced by the environment and are unstable.

Bulb life: Philips original UHP long-life bulb has a long life. DLP is generally suitable for long-term display, and the bulb life is short. Liquid crystal is not suitable for continuous long-term operation.

Service life: the service life of DLP wafer is more than 65,438+000,000 hours, and the service life of LCD panel is about 20,000 hours.

The interference degree of external light DLP technology and integrated box structure are not seriously disturbed by external light, so they cannot be displayed normally and clearly under external light.

Features of DLP projector: The technology of DLP projector is reflective projection technology. With the application of reflective DMD devices, DLP projectors have the advantages of excellent reflection, contrast and uniformity, high image definition, uniform picture, bright colors, no image noise, stable image quality, accurate and continuous reproduction of digital images, and timelessness. Because the ordinary DLP projector uses a DMD chip, the most obvious advantage is its compact appearance, and the projector can be made very compact. At present, all mini projectors below 1.5 kg on the market are DLP type, and most LCD projectors are above 2.5 kg. Another advantage of DLP projector is its smooth image and high contrast. These video advantages make it the first choice in the home theater world. It has a high contrast. At present, the contrast ratio of most DLP projectors can be between 600: 1 and 800: 1, and the low-priced ones can also reach 450: 1. The contrast ratio of LCD projector is only about 400: 1, and the low-grade projector is only 250: 1. The visual impact of the picture is strong, there is no sense of pixel structure, and the image is natural. Another advantage of DLP projector is its weak graininess. At the resolution of SVGA(800×600) format, the pixel structure of DLP projector is weaker than that of LCD. As long as the relative viewing distance and the screen size of the projected image are properly adjusted, the pixel structure can no longer be seen.

Features of LCD projectors: Advantages of LCD: First of all, in terms of picture color, mainstream LCD projectors are all three-piece sets, with independent LCD panels and three primary colors of red, green and blue. In this way, the brightness and contrast of each color channel can be adjusted separately, and the projection effect is very good, so that high-fidelity colors can be obtained. In the same class of DLP projectors, only one DLP can be used, which is largely determined by the physical characteristics of the color wheel and the color temperature of the lamp. There is nothing to adjust, only the right color can be obtained. However, compared with LCD projectors with the same price, there is still a lack of bright colors at the edge of the image area. The second advantage of LCD is its high light efficiency. Under the same wattage light source, LCD projector has higher ANSI lumen light output than DLP projector. In the high brightness competition, LCD still dominates. In a projector weighing about 7 kg, the LCD projector can reach the brightness above 3000 ANSI lumens. Disadvantages of LCD: The obvious disadvantages of LCD projectors are poor black level and low contrast. The LCD projector is black and always looks gray, and the shadow part is dim and has no details. This is not suitable for playing movies and other videos, and it is not much different from DLP projector in terms of text. The second disadvantage is that the picture produced by the LCD projector can see the pixel structure, and the audience seems to be looking at the picture through the pane. The LCD projector in SVGA(800×600) format can see the pixel grid clearly regardless of the screen image size, unless a product with higher resolution is used. At present, microlens array (MLA) has been applied in LCD, which can improve the transmission efficiency of LCD panel in XGA format, soften the pixel grid, make the pixel grid subtle and inconspicuous, and will not have any impact on the image clarity. The pixel structure of LCD can be reduced to be similar to that of DLP projector, but there is still a gap.

DIY projector is to make a projector by yourself. At present, the DIY projection of ordinary users is generally a single LCD projection (liquid crystal projection), which belongs to light transmission projection.

Now the LCD projectors sold in the market are all three-piece LCD projectors. This kind of projection is characterized by good color reproduction, but low contrast (except for household projection). Because of the aging problem of LCD, especially in the long-term high-temperature working environment, its life will be shorter than that of DLP projection.

DLP projection belongs to reflective projection. The main principle is that the image obtained by light reflection of DMD chip of TI company has high contrast. But now, except that the cinema uses three DLP projections, all the products on the market are single DLP. DLP projection is generally cheaper than LCD projection because of cost and structure.

The light source in LCD projector is metal halogen lamp or UHP (cold light source), which emits bright white light. After the white light passes through the beam splitter in the optical system, it is decomposed into three primary colors of RGB (red, green and blue), which pass through the liquid crystal at precise positions. At this time, each liquid crystal is like a light valve, which controls whether and how much light in each liquid crystal passes. In this way, the light of three element colors is accurately projected onto the screen through the lens of the projector, and which point should be what color and how much the light intensity distribution is accurate. In this way, the projection on the screen constitutes a color image consistent with the source image. Ordinary LCD projectors have many advantages, such as good color, price advantage and good brightness uniformity.

The obvious disadvantages of LCD projector are poor performance of black layer and low contrast. The LCD projector is black and always looks gray, and the shadow part is dim and has no details. This is not suitable for playing movies and other videos, and it is not much different from DLP projector in terms of text. The second disadvantage is that the picture produced by the LCD projector can see the pixel structure, and the audience seems to be looking at the picture through the pane. The LCD projector in SVGA(800×600) format can see the pixel grid clearly regardless of the screen image size, unless a product with higher resolution is used.

At present, the market share of DLP projector is not as good as that of the main LCD projector. However, as a new projector product, in terms of technology and application market, compared with LCD projection technology, the biggest advantage of DLP projection lies in its advantages of high resolution and high brightness, clearer and sharper images, purer black and white, richer gray levels, smaller size and lighter weight. DLP projectors are more expensive, but the color performance is worse.

Summary: DLP projector has higher brightness and higher price, while LCD projector has better color and lower price. As for purchasing, it depends on your own needs.

DLP is the abbreviation of English DigitalLightPorsessor, which translates into digital optical processor. DLP uses DMD (Digital Mirror Device) digital micro mirror as the imaging device of light valve. The technology of DLP projector is reflective projection technology. With the application of reflective DMD devices, DLP projectors have the advantages of excellent reflection, contrast and uniformity, high image definition, uniform picture, bright colors, no image noise, stable image quality, accurate and continuous reproduction of digital images, and timelessness. DLP projectors can be divided into single-chip computers, dual-chip computers and triple-chip computers. The red, green and blue of DMD digital signal rotate in turn, and the small mirror is turned on or off according to the position and color of pixels. At this time, DLP can be regarded as a simple light path system, which consists of only one light source and a set of projection lenses. The reflected image of DMD is enlarged and projected directly on the screen, so a vivid and bright demonstration effect is presented.

Because the ordinary DLP projector uses a DMD chip, the most obvious advantage is its compact appearance, and the projector can be made very compact. At present, all mini projectors below 1.5 kg on the market are DLP type, and most LCD projectors are above 2.5 kg. Another advantage of DLP projector is its smooth image and high contrast. These video advantages make it the first choice in the home theater world. It has a high contrast. At present, the contrast ratio of most DLP projectors can be between 600: 1 and 800: 1, and the low-priced ones can also reach 450: 1. The contrast ratio of LCD projector is only about 400: 1, and the low-grade projector is only 250: 1. The visual impact of the picture is strong, there is no sense of pixel structure, and the image is natural. Another advantage of DLP projector is its weak graininess. At the resolution of SVGA(800×600) format, the pixel structure of DLP projector is weaker than that of LCD. As long as the relative viewing distance and the screen size of the projected image are properly adjusted, the pixel structure can no longer be seen. Long service life and good image quality stability: the reflection technology makes the DMD chip absorb relatively little energy, and because it is a semiconductor device, it has good high temperature resistance, and the picture will not deteriorate obviously after long-term use.

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Digital optical processing

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Digital light processing

Imaging principle

origin

Working process of DLP

Advantages of DMD imaging

Classification of DLP system

Technical characteristics of DLP

Electric donkey DLP

Data leakage protection

background introduction

Definition of data leakage protection

The way of data leakage

Principle of data leakage protection

Prospect of data leakage protection

Digital light processing

Digital light processing

Imaging principle

origin

Working process of DLP

Advantages of DMD imaging

Classification of DLP system

Technical characteristics of DLP

Electric donkey DLP

Data leakage protection

background introduction

Definition of data leakage protection

The way of data leakage

Principle of data leakage protection

Prospect of data leakage protection

Digital light processing

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Digital light processing

DLP is the abbreviation of "digital light processing", that is, digital light processing, which means that this technology first digitizes the image signal and then projects light. It displays visible digital information based on digital micromirror device (DMD) developed by TI (Texas Instruments, USA). Specifically, DLP projection technology uses digital micromirror chip (DMD) as the main key processing element to realize digital optical processing. The principle is that the cold light source emitted by UHP bulb passes through the condenser lens, and the light is homogenized by the rod. The processed light passes through the color wheel, which divides the light into three colors of RGB (or more colors such as RGBW), and then the colors are projected onto the DMD chip by the lens, and finally reflected by the projection lens and imaged on the projection screen.

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Imaging principle

The light source refracts on the DMD chip after passing through the color wheel, and the DMD chip emits light to the projection screen after receiving the control signal from the control panel. Outside the DMD chip, it looks like a small mirror, enclosed in a closed space composed of metal and glass. In fact, this kind of mirror is composed of hundreds of thousands or even millions of micromirrors. Take DMD chip with XGA resolution as an example. The area with width 1cm and length 1.4cm has 1024×768=786432 micromirror units, each micromirror represents a pixel, and the image consists of these pixels. Because the pixels and chips themselves are quite small, the industry also calls these products with microdisplay devices microdisplays.

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origin

199 1 year, a 300,000-pixel LCD projector has been put on the market. 1996, LCD projection has rapidly developed to the stage of VGA or even SVGA data projection and home theater projection, but it is difficult to break through in brightness and contrast because of technical bottlenecks. In this context, it is logical for DLP projection technology to enter the historical stage.

The technical core of DLP is DMD chip, which was invented by Dr. Larry Hornback of the United States in 1977. At first, it mainly developed the imaging mechanism of printing technology. At first, micro-mechanical control was developed by analog technology, and 198 1 year was changed to digital control technology. Officially named digital micromirror device, it began to develop in two directions: printing technology and digital imaging. 199 1 year, Texas instruments decided to separate the development of digital images and become a business department, and developed the first digital image product in 1996, and officially stopped the research and development of printing technology in 1997, and comprehensively carried out the research and development of digital images.

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Working process of DLP

DMD device is the basis of DLP. A DMD can be simply described as a semiconductor optical switch, with 500 ~ 1.3 million microlenses gathered on a CMOS silicon substrate. A microlens represents a pixel, and the conversion rate is 1000 times per second, or faster. The size of each lens is 14μm× 14μm (or 16μm× 16μm). In order to adjust its direction and angle, a rotating device similar to a hinge is arranged under it. The rotation of the microlens is controlled by the digital driving signal from CMOS RAM. When a digital signal is written into SRAM, static electricity will activate the address electrode, lens and yoke, making the hinge device rotate. Once the corresponding signal is received, the lens tilts 10, thus changing the reflection direction of the incident light. The microlens in the projection state is displayed as "ON" and tilts+12 with the digital signal from SRAM; If the microscope lens is in non-projection state, it will be displayed as "off" and tilted-12. At the same time, the incident light reflected in the "on" state projects the image onto the screen through the projection lens; The incident light reflected on the microlens in the "off" state is absorbed by the light absorber. In short, the working principle of DMD is that the required light is reflected by the micromirror device, and the unnecessary light is absorbed by the light absorber to realize image projection, and its irradiation direction is realized by controlling the angle of the micromirror by electrostatic action.

By addressing the memory cells under each lens with binary plane signals, each lens on the DMD array is electrostatically tilted to an on or off state. The technique of determining which direction each lens tilts for how long is called pulse width modulation (PWM). The lens can be switched on and off more than 1000 times in one second. At this point, DLP becomes a simple optical system. The light from projection lamp passes through a condenser lens and a color filter system and directly shines on the DMD. When the lenses are in the open position, they reflect light to the screen through the projection lens to form a digital square pixel projection image. When the DMD seat, projection lamp, color wheel and projection lens work together, these flip mirrors can reflect the image to the demonstration wall, movie screen or TV screen together.

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Advantages of DMD imaging

DMD can provide 6.5438+0.67 million colors and 256 grayscales, thus ensuring that the moving images projected by DLP projectors are rich, delicate, natural and lifelike.

A DMD can build up to 2048× 1 152 arrays, and each unit can produce about 2.3 million mirrors. This DMD has the ability to make a real HDTV.

(1) Erase the defects in the image.

The unusually fast switching speed of DMD micro-mirror device combined with the accurate image color and gray reproduction technology of double pulse width modulation makes the image clearer with the refresh of the window, and the defects in the image can be erased by enhancing contrast, drawing boundary lines and separating individual colors.

(2) Avoid the "screen door" effect.

In many LCD projection images, we will see that when the size of an image increases, the gap in the LCD image will become larger, but this will not happen in DLP projectors. The size and shape of DMD mirror determine all this. 90% of each lens dynamically reflects light to generate a projected image. Because one shot is so close to the other, the image looks seamless. The size of DMD lens is very small, the length of each side is 16 micron, and the gap between adjacent lenses is less than 1 micron. The lenses are square, so each lens shows more content than the actual image. In addition, when the resolution is improved, the size and spacing remain unchanged, so no matter how the resolution changes, the image can always maintain high definition.

(3) Coexistence with light

Many viewers often want to keep the brightness or open the curtains when watching the projection. Compared with traditional projectors, DLP projectors will produce more light on the screen, which also depends on the technical characteristics of DLP itself. The strong reflective surface of DMD reflects more light to the screen by eliminating obstacles in the light path, which makes maximum use of the light source of the projector. DLP technology reflects images according to their contents. The light source of DLP has two working modes, either hitting the screen through the lens or directly entering the absorber. More advantageously, the brightness of the projector based on DLP technology increases with the increase of resolution. In the case of high resolution such as XGA and s XGA, DMD provides a larger reflection area, so that the brightness of light can be used more effectively.

(3) The image is more realistic and natural.

DLP is not only a simple projection image, but also a copy image. In the process of processing, the source image is first digitized into a gray image with 8 to 10 bits for each color. Then, these binary images are input into DMD, where they are combined with carefully filtered color light from the light source. These images are imaged on the screen after leaving DMD, and all the brightness and nuances of the source images are preserved. The unique color filtering process of DLP controls the color purity of the projected image. The digital control of this technology supports infinite color reproduction and ensures the vivid reproduction of the original image. With the appearance of other display technology and photography technology, DLP makes those lifeless images have vivid colors. The reproduction of digital color ensures the restoration degree of images and real materials, and there is no bright spot or other typical projector light washing phenomenon.

(4) High reliability

DMD has not only passed all the standard semiconductor qualification tests, but also the system manufacturing is very strict and needs to go through a series of tests. All components have been selected and proved to be reliable before they can be used to manufacture digital electronic partial drive DMD, and it is also proved that its service life in simulated operating environment exceeds 654.38+ million hours. The test proves that DMD can run more than 1700 trillion cycles without trouble, which is equivalent to the actual use time of the projector exceeding 1995 times. Other test results show that DMD is trouble-free in more than 1 1000 power cycles and 1 1000 temperature cycles, thus ensuring a reliable operation period of more than 30 years in the application field with great demand.

5] More convenient mobility

According to the general application requirements, a single DMD can realize the unification of size, weight and brightness. At present, domestic or commercial DLP projectors mostly adopt single-chip structure, while the more advanced three-chip structure is generally only used in digital cinema or high-end fields. Therefore, users can get a smaller, brighter and more portable system, which can provide excellent image quality. DLP technology is an all-digital infrastructure with minimal signal noise.

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Classification of DLP system

(1) single-chip DLP system

In a single DMD projection system, a color wheel is needed to generate a full-color projection image. The color wheel consists of red, green and blue filter systems, which rotate at a frequency of 60Hz. In this structure, DLP works in sequential color mode. The input signal is converted into RGB data, and the data is written into the SRAM of DMD in sequence. The white light source is focused on the color wheel through the focusing lens, and then the light passing through the color wheel is imaged on the surface of DMD. When the color wheel rotates, red, green and blue light are sequentially emitted on the DMD. The color wheel and the video image are sequential, so when the red light shines on the DMD, the lens will tilt to "On" according to the position and intensity where the red information should be displayed, and the green light, the blue light and the video signal also work in the same way. The human visual system concentrates red, green and blue information and sees panchromatic images. Through the projection lens, the image formed on the surface of DMD can be projected on the big screen.

⑵ Two-piece DLP system

This system takes advantage of the fact that metal halide lamps have no red light. Instead of red, green and blue filters, the color wheel uses two auxiliary colors, magenta and yellow. The magenta part of the color wheel allows red and blue light to pass, while the yellow part can pass red and green light. As a result, in the alternate rotation of the magenta-yellow color wheel, red light always passes, while blue light and green light basically occupy half of the time. Once passing through the color wheel, the light directly hits the dichroic prism system. Continuous red light is separated and emitted to a DMD dedicated to processing red light and red video signals, while continuous blue light and green light are projected to another DMD dedicated to processing alternate colors. The DMD is driven by green and blue video signals.

(3) Three-piece DLP system

Another method is to divide white light into three primary colors through a prism system. This method uses three DMDs, one for each primary color. The main reason for applying three-piece DLP projection system is to increase brightness. Through three DMDs, the light from each primary color can be directly and continuously projected onto its own DMD. Therefore, more light reaches the screen, resulting in a brighter projected image. This efficient three-piece projection system is used for large screen and high brightness applications.

4. The potential problems of ⒋DLP.

People often mention that DLP projectors have only one weakness, that is "rainbow effect". Specifically, the colors are simply separated into three distinct monochromatic colors, namely red, green and blue, which look like rainbows after rain. This is because the rotating color wheel is used to modulate the color of the image, and also because some people's visual system is particularly sensitive and can detect the process of changing from one color to another, instead of mixing several monochromatic colors into new colors through visual persistence as most people do. Except for some users who can separate colors, some users may have eye edema and headache due to the rapid change of colors. LCD projectors and three-piece DLP projectors will not have this phenomenon. They are formed by the superposition of three fixed red, green and blue images in physical structure.

This question has different effects on different people. Some people can see the rainbow effect, even so serious that the picture is almost invisible. Some people only occasionally see the traces of the rainbow, far from being unable to appreciate the picture. For the latter, this shortcoming of DLP has no practical impact. Fortunately, most people can't see the trace of rainbow, and they won't be confused by edema and headache. Please think about it, if everyone can see the rainbow effect on the DLP projector, then the DLP projector will lose its chance to exist.

But the rainbow effect is always a problem anyway. Texas Instruments and projector manufacturers using DLP technology are still trying to solve this problem. The color wheel of the first generation DLP projectors rotates 60 times per second, which is equivalent to a frame rate of 60Hz or 3600 revolutions per minute. In the color wheel, red, green and blue pixels each have a segment, so each color is refreshed 60 times per second. This first generation product is called "1X" speed.

Only a few people can see the rainbow effect in the first generation products, and even fewer people can see the rainbow effect when the color wheel speed of the improved second generation products rises to 2X, that is, 120Hz, 7200RPM.

Nowadays, many DLP projectors specially designed for the home theater market adopt a six-segment color wheel. The color wheel turns red, green and blue twice, and the color wheel rotates at 120Hz or 7200RPM, which is called 4X speed commercially. With the continuous improvement of color refresh rate, fewer and fewer people can see the rainbow effect. But so far, rainbow guilt is still a problem for a small number of viewers.

Application of 4.4. digital light procession

DLP technology is an original solution to produce digital multi-light source display by using optical semiconductor. It is a highly reliable all-digital display technology, which can provide the best image effect in various products, such as large-screen digital TV, corporate/family/professional conference projectors and digital cameras (DLP cinemas). At the same time, this solution is also a fully mature independent technology adopted by many electronic enterprises around the world. Since 1996, more than 5 million systems have been provided to more than 75 manufacturers.

DLP technology has been widely used to meet various demands of pursuing excellent quality of visual images. It is also a multifunctional display technology on the market. This is the only display technology that can support both the world's smallest projector (less than 2 pounds) and the largest movie screen (up to 75 feet). This technology can make the image achieve high fidelity and give a clear, bright and vivid picture.

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Technical characteristics of DLP

Technical advantages:

The advantage of DLP display boards is that they have extremely fast response time. When displaying an image, you can turn a single pixel on and off multiple times. It uses the display panel to generate true color images through field sequential filtering. The steps are as follows: firstly, green light shines on the panel, and the mechanical mirror adjusts the green pixel data of the displayed image. Then the mirror adjusts the red and blue pixel data of the image again. (Some projectors use the fourth white area to increase the brightness of the image and get a bright tone. It all happened so fast that people's eyes couldn't notice it at all. Images of different colors that appear in turn are recombined in the brain to form a complete panchromatic image.

For high-quality projection systems, three DLP display panels can be used. Each board is painted red, green and blue respectively, and the image is reorganized into a single true color image. This technology has been used in large-scale projection equipment of some digital cinemas. DLP display board has high resolution and is very reliable. Their contrast ratio is about twice that of polysilicon LCD projectors, which makes them more effective in bright rooms.

Technical defects:

DLP itself has almost no problems, but they are more expensive than polysilicon panels. When you carefully observe the moving points on the screen (especially the white points on the black background), you will find that the filtered images will be decomposed into different colors. When using the projector, the motor will make a certain noise when driving the color wheel to rotate. Now a new solid color filter system on the market can solve this problem well.