Projecting this thing at least for a year, may be the aunt to see me perseverance, suddenly let happiness come, so do not give up small partners, ah, more and more frustrated is the king.
The longing for the big screen, I think everyone has. IMAX must be selected to watch movies. How can I be satisfied with the 40-60 inch TV in my home? My big screen dream started in 2011, when the 720P projector was still moving thousands of dollars. And I was already reluctant to project, but unfortunately at that time still a student, 4000+ investment, should live up to a few months of living expenses.
But students, there is time, love toss, so use a limited amount of money to DIY a LCD projection, but also to a target selected at that time, the use of LED light source. At that time, most of the projection DIY forums were dominated by high-pressure halogen lamps. There was almost no LED, and few references were found. This period of history, which looks very sad now, will be discussed later. Let's first take a look at the protagonist of this test, NEC CD3100H Home Projection.
==================== First: Unpacking ======================= = The NEC's projection is more commercial than usual. The overall package is very simple. Only the side labels can see the model. I thought that there will be a box after the box is opened. However, this is not important, as long as the packaging is environmentally friendly. 
â–½ The box is cleverly designed with a gap at the top and can open a small box. All the accessories are placed inside, including manual warranty card, remote control, power cord, VGA cable, and a CD. 
â–½ The main body of the projector adopts the cushioning and cushioning commonly used in the process of wine bottle logistics, which provides a full range of protection for projection. Such a package is sufficient for long-distance transportation. Tucao had to face the new products that were introduced in 2016. It was actually a little unreasonable to return with a VGA cable. 
â–½Instructions, warranty cards, quick start, CD-ROM, etc. In fact, it is still possible to see the strong business style of NEC. There are no informal descriptions (no design). The manual has no description of daily use. It is just some precautions. NEC has provided the light bulb for this projector for 6 months and the whole machine has a 2 year warranty. The whole machine is still quite good for 2 years.
â–½ The layout of this remote controller is very classic. If I remember correctly, the same mold has appeared on Skyworth TV and optical motor top box. It is not that the male model product is not good enough, at least the grip of this remote controller is still very comfortable. . However, the most critical issue is that it is not optimized for projection night use, such as pressing the buttons with night light, so that the lights can be clearly operated after turning off the lights.
▽ Milky white body, simple design language, can be easily integrated into the home, although positioned at home, NEC NEC CD3100H has 1080p (1920 × 1080) FULLHD resolution, six-color wheel, contrast 8000:1, brightness up to 3000 lumens, support for 3D, and an 8-watt speaker built-in, such a powerful brightness, so that we have expectations in the performance of the shading environment is not particularly good home use scene.
You can see the green coating of the lens. The infrared emission receiving window on the right side of the lens (pointed by the arrow) should shoulder two functions of remote control receiving and 3D glasses synchronization signal sending. 
â–½ Around the body, except for the rear part, all the other three sides have heat dissipation openings. The heat dissipation effect should be ideal. The design with no vent on the back allows you to place the projection as close as possible to the back wall. Due to the fact that the projection is not a short focal model, the projection distance is slightly higher (more on this later). 
â–½ At the top of the camera (at the bottom of the mount), the operating area is focused on the lens (upper left), light bulb room (upper right), key (middle-down), power button, and status light (lower right). Button area will be the common buttons directly on the panel, you can easily debug, especially when mounted on the body can be trapezoidal correction operation, spare lamp model is NP35LP, Ma Yun family does not have this model, According to the common sense replacement bulb price is 300-500 yuan, or acceptable. 
â–½ Zoom and focus ring, manual adjustment. There is no high-tech for autofocus, but projecting this kind of thing doesn't require frequent adjustments. 
â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½. 
â–½ There are a total of four mounting holes at the bottom of the camera body. The mounting screws are M4 screws. The rear pad can be raised by rotation and has a M2 stud inside (visual inspection) 
The interface of the CD3100H is very rich. In addition to the conventional HDMI, the HDMI1 also supports the MHL function. If an MHL-enabled device is inserted, the screen of the mobile terminal can be output to a huge screen. CD3100H retains the commercial machine's VGA input and output, and even retained the AV video signal terminal, there is a control serial port can be connected to the remote control panel, in addition to a LAN excuse, unfortunately there is a miniUSB interface But it is just the project port (may be used to brush the firmware), since positioning home, and retain a VGA and AV port as a guarantee of compatibility is very good, but also reflects the responsibility of the big manufacturers, but the VGA output, serial port The value of controlling the existence of such interfaces is not much, after all, these functions are very unlikely to be used by ordinary home users. 
â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½ â–½? The first picture is the cold start, the light bulb needs a light process, LED has no such process, but the brightness of 3,000 lumens is more difficult to achieve at this stage of the LED. The first time you turn on your phone, you need to select a language. There are a large number of available languages. This also reflects NEC's global market share.
â–½OK, successfully lit up the projection. The next step is to consider where to put it and how to install it. The projection ratio of CD3100H is 1.5-1.8, the width of 100-inch 16:9 screen is 2.21m, so the projection distance is the shortest 2.21*(1.5)=3.315 meters, and the longest is 2.21*(1.8)=3.978 meters. Think about our living room. The width is 4 meters, so I bought a 100-inch curtain for the order.
Regarding the selection of the curtain, because the curtain slot was not reserved during the renovation, if the electric screen was selected, the curtain could only be hung on the wall. I was a little obsessive-compulsive and I could not accept it. Then I found an artifact, which was the screen . Different from the ordinary curtain lifting downward, the curtain pulls the curtain upwards from the bottom reel through the hydraulic tappet and the support frame. 100-inch ground pull screen, shell size length of 2.4 meters. There are two feet under the shell that can be rotated out.
â–½ Because of the help of hydraulic tappets, it is easier to lift the curtain from the scrolls, which is about the power needed to lift 1Kg. After the reel is lifted more than 0.5 meters, it can be hovered at any position and will not be automatically retracted. The height of the entire development is about 2 meters. 
The curtain was solved, the main problem came and how the projection was installed. As the machine has been placed directly on the back of the sofa after unpacking, there is a storage shelf between the sofa and the ceiling, so I would like to put the projection on the shelf so that the hanger does not need to be installed, saving time and effort. So made an acrylic plate, ready to extend the shelf a little out and place the projection.
After waiting for two days, the acrylic board found two problems. First, the shelf position was not in the middle of the screen. If you want to pursue the lens on the central axis of the curtain, you must move the acrylic board outwards. The thickness of 5mm acrylic is obviously insufficient. Now. The second problem is also the most serious one. It directly led me to abandon the plan to put projections on shelves. 
â–½ I did a few pictures for everyone to intuitively feel, because there are two projection modes at the beginning of the projection design, one is to put the desktop positive projection, one is hanging upside down on the ceiling, so that the screen from the projection lens and Not a horizontally symmetrical fan, the lower edge of the projection sector is almost horizontal, and the positive throw can control the angle within a reasonable range, but if it is placed on the shelf, it is near the middle of the screen, regardless of the front or rear projection. The machine's body will have a larger angle with the horizontal plane, although you can adjust with a trapezoidal correction, the picture quality is not reduced, the screen size is severely shrinking! So the shelf program PASS
â–½ PASS lost the shelf solution, so the projection seems to be only on the sofa and the lifting of the two options, lifting the need to consider the wiring layout, the time may be too late, so before all plans are good, or the first projection On the sofa, because there is no wire for any projection, even if the cable is hoisted in the future, it is a troublesome task. Therefore, with the intention of least connection, the Haimei TV box is placed on the projection side, and the audio is transmitted wirelessly. In order to reduce the delay of wireless audio transmission as much as possible, I chose a Bluetooth audio transmission and reception device that supports APTX II. It also has certain reference for value-friends who do not want to reserve HDMI or audio cables, but do not want long-distance wiring. value.
â–½ The wireless transmitter and receiver devices both support APTX. Another fiber is used to connect the transmitter to the Haimedi TV box, because it has been commented that the fiber connection can reduce the delay and improve the sound quality. 
The Bluetooth transmitter supports two devices and can also be used as a receiver. It is recommended that you buy two transmitters because transmitters are better than receivers in functionality and workmanship. The bottom of the transmitter has a soft rubber mat, and the back is a fiber optic interface, audio interface, charging interface. 
The surface of the receiver is a skin-like layer. The keys are loose and the overall texture is not as good as the transmitter. 
â–½ Insert one end of the fiber in the transmitter and one end in the TV box. The connection is completed. The charging problem is well solved. The Haimeidi TV box has three USB ports. The Bluetooth transmitter is not very powerful. You can directly plug the transmitter directly into the USB of the TV box. 
â–½ Press the transmitter and receiver buttons simultaneously (the transmitter has two channels, select one). Wait until the two devices' LEDs flash alternately. The red and blue lights are paired successfully. Both devices are illuminated in blue. light. I specifically bought a second audio cable for the receiver (be careful not to split the audio cable into two sub-headphone microphones) so that you don't need to frequently plug and unplug the audio cable when using the TV, but you need to pay attention to the TV and When the receiver is connected at the same time, when the receiver is turned on, it will pull down the TV audio output level and turn off the receiver switch. But there is one more step than I want. 
Therefore, the effect of the first stage is shown in the figure. The 100-inch screen almost fills the entire video wall and has a brightness of 3,000 lumens. Even if three spotlights are turned on, the restaurant's bright light can still achieve high picture brightness. 
Why did you say that it was just the effect of the first stage, because although the width of the drawing in my living room building was 4m, the wall was removed. The curtain to the wall, the lens to the wall, and the rest may not even be 3.5 meters, so it's a little less than 100 inches in a limited space, although I bought the elbow power plug and HDMI adapter squeeze space However, space is still not enough.
So finally the CD3100H was settled in a tatami room, where the space conditions were far better than the living room, and the wiring pressure here was much smaller than the living room. The key is that the living room can be a wave of people watching domestic drama. The tatami room can be watched as large and not interfere. In the end it is still hanging on the rack, audio is still using APTX Bluetooth connection. 
â–½ Since the position is positive, it does not require a large trapezoidal correction. Vertical-2 here is only a demonstration. 
â–½ Effect display: Aunt Zhang's home page is very clear and there is no pressure on web browsing. 
â–½ resolution test, physical resolution of 1920 * 1080, the dividing line can be to 6-7, which is no different from the ordinary 1080P LCD screen, it is qualified in the resolution. 
â–½ color performance, due to shooting non-vertical camera, using ultra-wide-angle lens around there is a more obvious dark corner, the actual display effect is much better than this, light people only care about color performance. On the left is the real shot, and the right is the original drawing. 
▽ ▽ ▽ ▽ ▽ ▽ ▽ ▽ ▽ ▽ ▽ ▽ ▽ CD CD 。 。 。 3 3 3 3 3 3 。 。 。 。 。 。 。 。 。 。 。 。. Single DLP should be like this, in fact, it's pretty good, and it's not that different from ordinary LCD. 
With a contrast ratio of 8000:1, the outline of the font is clearly visible, and the actual resolution of the text can be identified by the arrow. Everyone can judge for themselves. 
Sample performance, the red part is still very bright. 
The indigo blue sky and the lake surface performed very well. It was almost identical to the original image. The green part was not as green as the original image. The lack of green could also be shown in the proofs. 
â–½ This also fully demonstrates that the transition between purple and red is not good enough. In general, it is more pink than purple. 
The blue sea is better and has a deeper blue. 
This is almost the same as the original map except that the setting sun is not warm enough. 
Then look at the text performance, in fact, the environment is dark enough, enough resolution projection, accurate focus, text performance will not be bad. 
WPS text performance, the paper part of the text is particularly clear, the edge will be a little bit of deterioration, the toolbar is not as sharp as paper text. However, it does not affect use at all. 
â–½ 3D function, NEC CD3100H supports DLP Link 3D function, so theoretically support DLP Link 3D glasses can be used, I search the mainstream shopping site, and there is no NEC original active shutter glasses sold. Therefore, the purchase of other home 3D glasses, the use of proof is no problem, compatibility is not bad.
â–½ The player is using Storm Video, the default is to display left and right separately, you need to set the player and monitor "projection" to 3D mode to turn on the left and right 3D, the display settings need to be set "On the display 2 only" There will be a "3D display mode" switch. After the setting is completed, the projector will display a black screen for a moment due to the signal switching, and then enter the 3D display mode. 
â–½ â–½ 3 3 3 3 3 3 3 3 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 
噪音 Everyone is more concerned about the noise problem, there will be a certain amount of noise, 1m impact is relatively small. When it is turned off, it will force a large amount of air to dissipate heat for a period of time, and the noise will be greatly improved. It is recommended that you do not immediately switch off the power when it is used up. 
â–½ The power consumption of the energy-saving mode is 204W, and the non-energy-saving mode is 259W. The gap is not significant. So I suggest that you can use energy-saving mode. Use high brightness mode when watching 3D movies. 
The outlet is located on the front left side of the fuselage, the maximum outlet temperature can reach 72 degrees, it is recommended that this place is slightly away from the human body. The inlet temperature is 20 degrees Celsius. 
â–½ The maximum temperature at the top of the fuselage is 50.3 degrees and appears near the bulb. The rest of the places are very cold. 
The average temperature at the top of the bowl is around 20 degrees Celsius. 
â–½ This part of the book describes a DIY LED projection for the summer of 2011. Although this machine may seem crude, it has brought to our dormitory life a rich spiritual life. The effect is shown below. Is it because some student party is unable to sit still? This is the effect of a lamp turned on. There is a laser machine on the left, so the whole picture is shifted to the right. 
â–½ LED cooling system is using an overclocking 3 Red Sea radiator, double heat pipe, I added a fan, an air convulsion. The power of 100W can be measured to more than 90W. 
If you remember correctly, it should be a 8.9-inch CMO screen with a resolution of 1280x768. Need to remove the screen backlight module and polarizer, the LCD screen is translucent. 
The chassis has not yet arrived. Take a cardboard box instead of starting the test. Actually watching the video of watching the sea at the time, the point light source passes through the Fresnel lens and turns into a parallel light source and passes through the liquid crystal screen. The light passing through the liquid crystal screen has a color, forms an image, and then passes through another Fresnel lens. Converge to the lens, and finally cast it onto the curtain. 
When the chassis is up and the chassis is a halogen light box, the LED installation is actually very poor. Did not find a suitable reflector bowl and lens, simply useless, so the brightness loss is relatively large (this is the biggest regret, then there is no energy to toss the lens, because the lens is changed, the focal length is changed, the chassis is not long enough There will be a series of troubles to lengthen.) 
Unknown lens, parameters have been forgotten. 
â–½ LCD driver board, interface and function are complete. And the chassis is also quite matched. 
The things that make up one's own DIY are most likely to be unsafe, especially when used in dormitories, so the power cord with its own insurance is used specially, and the power interface is also used with a power interface with insurance, security *2. 
â–½ The last finished product. This is the only screen shot taken with the curtain at that time. It uses the classroom's 4:3 glass bead curtain, so there will be a part of the screen out of the curtain, but the effect is considered to be good. Only low brightness (compacted with CD3100H). Finally, this DIY was also taken to the school for participation.
Why is it rolling? Look at the figure below. Due to the fact that there is a white line on the top of the DIY projection LCD, this white line is just below the screen. You can see through this white bar that the CD3100H can still overexpose the picture when the exposure is reduced. So brightness, 3000 lumens is not covered.
When I saw this, I suddenly thought of my grandmother who had nearly 90 years of age last year to watch Kung Fu Panda. The old man was wearing a diaper and read it. Now she can see the big screen at home without going to the cinema. She looks very seriously. So no one can withstand the temptation of the big screen, and now a box of HD resources can be done, the projection technology is also so mature, it is time to add a projector at home, the brightness is no longer a problem, there is no embedding can not become Excuses. 
In the final analysis of the protagonist of this test, NEC CD3100H, its brightness is undoubtedly its greatest advantage, during the day to pull on the curtains, a few small lights at night do not constitute a complete threat to it. For the average family, nothing is more important than brightness, and the CD3100H performs well. Although there are regrets in the colors of the 6-color wheel, it is sufficient to meet daily viewing. 
â–½ If NEC's CD3100H projections are shortcomings, I think most of them are common problems with this single-price DLP projection, and it may require extremely high players to consider more high-end 3DLP projections. If you really want to talk about NEC's shortcomings, it should be that NEC's business savvy has not yet been transformed into homes. It also means that for the average consumer to take care of less, there is no warm and detailed instructions for use, and the menu operation is also given for the first time. People will cause certain misunderstandings (for example, the energy saving mode can only be operated in the no-signal interface, that is, the blue screen. When the HDMI signal is being displayed, it will prompt that the operation cannot be performed. This prompt indicates the prompt of pressing the auto focus button on the remote control. The same, but the machine does not have auto-focus function, the user will naturally think that the machine has no energy-saving mode, but actually there are) 
Finally, if you look at mobile and portable, you can consider the recent hot LED micro-projection, and if you want to sit home to get the best possible viewing experience, then the choice of traditional projection is certainly correct, 3000 lumens of brightness It is not easy to achieve LED micro-projection, LED development speed, but the elimination rate is also fast. Buying a projector still expects to be able to use it for a few more years, with performance still at the mainstream level. The maximum brightness of 3,500 hours of lamp life, a movie can be used in the past 5 years, see how much conversion can see 2-3 years, then the cost of such a light bulb is actually not much. NEC's performance in commercial projections also gave me confidence in its product quality. At the very least, the brand wouldn’t say it wouldn’t disappear, and the after-sales service was relatively easy.
Finally, I wish you all buy your own projection, enjoy the curtain of the era! Thanks to Aunt Zhang for giving this test opportunity! Welcome to reward
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