LCD and DLP are the current mainstream projection technologies. Which technology is better? There is no standard answer, it depends on the needs of the application. Technology has its own strengths. For consumers, the key is to understand their needs, understand the characteristics of LCD and DLP, and choose on demand.
Note: LCD English is called LiquidCrystalDisplay, liquid crystal display projection technology.
DLP English is called DigitalLightProcessor, digital light processing technology.
The imaging device of the LCD projector is a liquid crystal panel. When light passes through the liquid crystal panel, each pixel is turned on or off according to an image signal, so that some of the light passes through and is cut off. This adjusts the light to produce an image that is projected onto the screen. The current mainstream LCD projectors have adopted EPSON (Epson) 3LCD technology, which uses three liquid crystal panels as imaging devices. The optical system separates the strong light into three primary colors of red, green and blue through the beam splitter, which can be used for each color individually. The brightness and contrast are controlled, which is very important for color performance. Since the current 3LCD technology is very mature, the three-color light can reach the screen at the same time. Therefore, in the 3LCD projector with high-quality control circuit, the projection effect is very good, the color reproduction is vivid, the layer is rich, and the color saturation is high.
The shortcomings of early LCD projectors are now improving one by one. For example, the grid phenomenon that LCD projectors are prone to occur, with the introduction of the 5th generation high-temperature polysilicon panel and the increase of projection resolution by EPSON, it is difficult to detect, and the 5th generation high-temperature polysilicon panel can greatly improve the resolution of projection. Up to 1920×1080, it really supports 1080p HD mode. Not only that, but the light utilization and contrast have also been greatly improved. With the aperture linkage technology, 3LCD technology has achieved a contrast ratio of up to 6000:1, which is very important for video playback. Overall, the best color performance makes 3LCD projection technology suitable for dynamic video playback, making it ideal for home theater applications.
DLP projectors are a rising star for LCD projectors. Its working principle is completely different from LCD projector. The light emitted by the light source generates red, green and blue light through the high-speed rotating color wheel, and then alternately illuminates the surface of DMD (DigitalMicormirrorDevice, digital micromirror). The micromirror on the surface of the DMD will switch at high speed according to the presence or absence of such color light in the corresponding pixel, and finally, after being reflected by the micromirror, it is projected onto the projection screen to form an image. Thanks to the reflection imaging method, the contrast can be made very high and the uniformity is excellent. Since there is no convergence problem, the text performance is especially good in projecting some small text or engineering drawings. Ideal for commercial or educational markets where text and forms are predominant.
Because the color of the DLP projector is mainly determined by the color wheel, the color processing speed is low, the color reproduction is not good, and the rainbow effect is also present, and the overall color performance is inferior to the 3LCD technology. With the improvement of technology, the current color wheel has evolved from the original RGB three-stage to the RGBW four-stage. The home color DLP projector with high color requirements even adopts the RGBRGB six-segment color wheel, which improves the color processing speed and greatly reduces The rainbow effect is small. However, from the actual effect, most DLP products still lack the vivid color that is truly ideal.
Overall, in the current high-end home projection market, high-end DLP products have won the favor of some users with high contrast ratio and good color enhancement technology; and 3LCD products at the same price are not inferior in every respect, even It is more able to express the unique "film sense" picture of the film. In the mid-range home projection market, 3LCD has won the attention of most users with its cost advantage and color performance.
16:9 best visual effect
At present, the most common display ratios are 4:3 and 16:9, which is the aspect ratio of the video display. For home projectors, the 16:9 aspect ratio is the best choice, more in line with the home theater display needs, because from the visual perception of people, the ratio of 16:9 is just the golden ratio of the human eye. Watching a movie with such a display ratio can make the picture more open and comfortable (the cinema widescreen movie is also the display ratio). From the perspective of considering compatible digital TV in the future, it is more appropriate to choose 16:9, because one of the national standards for digital television is the 16:9 display ratio.
It should be noted that the 16:9 display ratio supported by the home projector must be the true projection ratio. The true projection ratio refers to the native ratio of the projector's LCD panel or DMD chip. The true ratio of most business projectors is 4:3. Although it can also project 16:9 images, compared with the real 16:9 projector, the black bands above and below the projected image are obviously more, and the screen utilization is low. There is still a gap between the effect and the original 16:9 picture.
Align to HD resolution
Home projection is mainly used to play video, so its resolution must meet the requirements of various video sources. The most popular sources we use today are probably DVD and HDTV. The DVD can provide screens of 720×576 (PAL) and 720×480 (NTSC, Hollywood movies are all in this format). Combined with the 16:9 aspect ratio, the screen resolution of the home projection cannot be lower than 854×480. The 1024×768 XGA projector can achieve a resolution of 1024×576 when projecting a 16:9 DVD picture, although there are some pixels. Wasted, but still above the minimum requirement of 854×480. As for the 800×600 SVGA projector, the resolution is only 800×450 when projecting a 16:9 DVD screen, which does not meet the minimum requirements, and the lower the resolution, the more likely the grid phenomenon is, so it is not recommended.
If the economy permits, it is best to choose a projector that supports the HDTV standard, which is the future video standard. At present, HDTV mainly has 720p of 1280×720 resolution and 1080i/p of 1920×1080 resolution. Since the product cost of 1920x1080 resolution is too high, and 720p will be the mainstream HDTV specification for a long period of time, the current 1280×720 resolution home projector is a suitable choice.
When choosing the resolution, you should also pay attention to the resolution and the true resolution. In the promotion, the merchant prefers to promote the maximum resolution of the product. In fact, it is often compatible resolution, and the best picture of the projector must be based on the real resolution. To reflect. Since the true resolution of DLP is the number of micromirrors on the surface of the DMD, the cost of improving the resolution of the DLP projector is relatively high, and the high-resolution products are relatively expensive, which is also an important reason for the 3LCD projector products to dominate at the middle. .
Brightness is not as high as possible
Brightness is an important parameter for projectors, but not as high as possible for home projectors. The appropriate brightness depends on how large the picture is and the ambient light. For the same projector, the larger the picture, the lower the brightness, and the brighter the contrast; the eyes that look too dark will be strenuous, and the pictures that are too bright will be prone to visual fatigue. In general, a projector with a higher brightness will have a better picture. However, brightness is by no means the only factor determining the quality of the picture, and viewing the picture with high brightness for a long time may damage the eyesight (a movie is about 2 hours long). Therefore, it is not advisable to pursue high brightness alone.
Home projectors should choose the brightness that suits them according to the size of the screen, the size of the space, and the viewing environment. In general, models with 800 ANSI lumens are sufficient; for models around 25 m2, models with 1000 ANSI lumens can be selected; for projections over 25 m2, models with 1500 ANSI lumens are recommended.
Some manufacturers will use their peak lumens to name their projectors. This results in the same number of projectors, but the actual brightness is not the same, so don't blindly believe in parameters when buying.
In addition, contrast is also a crucial parameter. The reason why high-end home DLP projectors are favored by users is largely because of the high contrast and pure black. Contrast is the ratio of the brightest to the darkest areas of the picture, and the effect on the visual effect is no less than the brightness indicator. In general, the greater the contrast, the clearer the image, the better the layering, the brighter colors, and the better detail. The contrast is low, and the picture is gray and dim. In particular, the film uses dark colors, high contrast is more important, and higher and higher contrast will be an important development trend of home projectors.
Interface, noise, and focal length are comprehensive
The source of the video signal from the home projector determines that it must have a rich interface. The color of the image output from the DVD disc through the color difference interface is closest to the source level, so chromatic aberration is an indispensable interface for home projectors. In addition, the computer is also an important playback device. It is a good choice to choose a home projector with a DVI interface. Considering the future demand for high-definition playback, the HDMI interface is also best. As for the audio output, the audio output of the projector is not necessary because of the need to set up a home theater.
Home theaters must pursue the best picture and sound effects, so the projection environment of home projectors requires high noise and must reduce operating noise. Some home projectors have a sound absorbing layer, some have a fan front to the center of the machine, and some have lengthened ventilation tubes. At present, most household products have an operating noise of about 30 dB. Quiet design is also the direction that manufacturers are currently working on.
Ordinary projectors often require more than 3 meters to project an ideal picture. However, due to the limitations of national conditions, the domestic consumer's house space is usually not large, so short-focus home projectors will certainly be sought after, especially those with tight house space, will definitely take it seriously when selecting.
In general, due to the requirements of its own use, the home projector must be designed according to the use of its hardware configuration. Dedicated processing chip, optimized color system, 16:9 aspect ratio, rich interface, high contrast ratio, energy saving, heat dissipation and environmental protection. These features make it significantly different from commercial and educational projectors. In the future, home projectors, as the most promising products in the projection market, will certainly create a better home audio-visual environment for users.
Room selection
To fully exploit the advantages of the projector, not only must you carefully select it in the early stage of purchase, but also have a lot of points to pay attention to when installing it later.
The first is the choice of installing the room. The size and shape of the entire space will directly affect the audiovisual effect of the theater. The room is preferably rectangular, so that the projector can be placed at a considerable distance from the wall or the curtain. Generally, it should be 3 to 5 meters to ensure the distance, and the projector can release a larger picture. And the room is rectangular, it can also guarantee the sound effect, and can play a unique role in the harmony of modulation sound effects.
The ceiling is more suitable for the family
Secondly, the choice of installation method, depending on the way, the projector can be divided into desktop front projection, ceiling front projection, desktop rear projection, ceiling rear projection. The desktop is suitable for use anywhere, anytime, but there is a conflict with the placement of furniture. The most suitable for home layout is to design the ceiling to be cast. It is enough to buy a hanger of about 100 yuan. This method is more troublesome in the first installation. It needs to be modified, and it is better to drill and wire. At the same time when the new house is renovated.
Wiring should be protected against signal attenuation
Then there is the wiring. After using the ceiling, all the cables need to go down from the ceiling, and then go to the location of the signal source such as DVD or computer. According to the layout inside the projector, the projector is often in the living room, and the computer is in the room. In the study room, there is a large distance between the two. At this time, the extension of the signal cable will cause the signal input to the projector to be attenuated, causing the projection picture to be blurred and tailed or even shaken. Therefore, the projector signal line cannot be extended, under normal conditions, projection. The length of the instrument signal line should be controlled below 15 meters, so that the projection effect can be guaranteed. If the distance between the projector and the computer is more than 15 meters, it is best to install a signal amplifier at the signal input of the projector. Also, note that in order to ensure quality, these wires are wired with wires when they are routed inside the wall.
Environment and curtain considerations
In addition, the projection environment also has certain requirements. Although the brightness of the current projector is already quite high, to ensure the effect of the picture, it is still necessary to install curtains in the room to block the outdoor light. At the same time, the walls and floors of the room should not use reflective materials as much as possible, especially the ceiling above the curtain. It can even be made partially black to achieve the best results.
Although many people now use white walls as the projection screen, it is still not advisable from the perspective of effects. The effect of using white walls and high-grade curtains is very different. The gray screen works best in the curtain, but it is expensive, and if it is not too picky, the effect of the white screen is acceptable. When installing the curtain, it can be made electrically contractible for aesthetics, which requires a curtain box to be installed above.
Finally, personally confirm the position of your best sight when sitting on the sofa, and thus determine the distance of the curtain from the ground. If this height is not suitable, long-term viewing can easily cause visual fatigue. Generally speaking, the curtain should be about 80 cm away from the ground.
I wish everyone has the best home theater effect.
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