Now we must self-marketing, first advertising, immediately back. . . . . .
Chi Ling is here, you haven't come yet
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Saying that this time the character broke out and the ancestral graves had taken on smoke, it was very fortunate that Zhang Aunt had chosen Acer K138ST projector as the test experiencer. She was very excited and very grateful to Acer and Zhang Aunt. Therefore, we must not live up to everyone's expectations, take the thunderstorms of No. 13 typhoon and test it carefully at home. Now we are working overtime to create an experience report.
table of Contents
First, out of the box appearance
1-1: Outer packaging
1-2: Accessories
1-3: Body details
Second, the real machine test
2-1: Static Photo Test under Different Lights
2-2: Text Display Test under Different Lights
2-3: Video Playback Test under Different Lights
2-4: Other additional function tests
Third, the advantages and disadvantages of summary and 3D video experience
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First, out of the box appearance
This time, Aunt Zhang gave a SF Express fee. Although it was a special piece, it was the next day. The delivery boy also asked me, how much did you buy this projector? I stuttered instantly. Can I tell him that I didn't spend money? I can only tell him that he has spent more than 6K. The result of JD's investigation was actually 7999. Fortunately, SFG did not allow me to buy a cheap one.
The big box, in the end how much, compared with a whole package of A4 paper
Wrapped a very, very thick bubble bag and thanked Zhang Aunt for their care. In addition, we remind everyone that the test report is not a soft article.
Remove the thick bubble bags, the square-shaped drawer box jumped into the eye
The main features and technologies supported by the K138ST are listed above. The LED lamp life of 3W hours, wireless connection, true color 3D, DTS audio, Bluetooth connection, MHL support, etc.
You can see from the side label that this product was produced by the acer Kunshan plant, and the MIC is still strong.
Another side of the K138ST model close-up
Open the box, the protection is still excellent, there is a protective frame on top and bottom with strong corrugated paper, and the lines are not moving.
Traditional habits, look at the papers. The instructions are thin, but don't worry, there is a CD version.
Projectors are also expensive appliances, and the warranty terms naturally have to be taken care of. The whole machine for 2 years, LED bulbs are also 2 years, this is really good, after all, the most expensive is the light bulb, Acer is still sincere
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Continue to continue to look at.
Um, who's computer bag? This is Acer random projector package, after all, portable is one of the main K138ST. A large area of ​​textile material with some PU leather, still look good, able to carry back.
The projector and other accessories are all in the bag. And on the side of the projector, the bag was specially designed so that you can easily lay the half down and take out the machine. This design likes it.
Random accessories on the projector, remote control, power adapter and VGA cable, in the case of HDMI so popular, can you consider using HDMI to replace the VGA cable or add an HDMI cable? Everything is white, very nice, but worry about the long time the wire and remote control will be appalling
19V/5A output power adapter 
Very small and cute remote control, use CR2025 button battery. Use the official instructions for each key function. The label was written on the inside of the factory in June 2015. It is absolutely fresh. Aunt Zhang is always getting new goods for the first time.
How small is this remote control? It is also more than 13cm, shorter than the big screen mobile phone.
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The K138ST's main game is compact and portable.
The official size 24X14.7X5.9CM, in the end how much? Look at the picture below and A4 paper, more intuitive.
What about that weight? . . . . . With a bag of 1120 grams, 340 grams of weight was removed, and the projector was about 780 grams. It's really small enough and light enough.
Take a closer look at this guy with a big energy.
A bright big eye.
Behind the public interface, a specific look at the manual how to say.
Here about the MHL interface, would like to mention. To be honest, this is the first time I have seen this standard. In fact, it is a MicroUSB-HDMI interface that can transfer high-definition audio and video while charging at the same time.
This is the official introduction: MHL is the mobile terminal high-definition audio and video standard interface, which is a technology that has been commonly used in mobile electronic products, displays and accessories. Smartphones and tablets with MHL technology can be connected directly to HDTVs and HD displays via MHL adapters or cables. It allows the TV to deliver extremely clear HD content and immersive surround sound while charging the phone. MHL is the secret.
In fact, the number of supported devices is not that many. The official list of support devices can be found at http://meetmhl.cn/getting-started/do-i-have-mhl/. Unfortunately, neither my hand nor a nearby friend supports MHL's mobile devices. There is no way to show it to everyone.
In addition to that USB interface, we do not misunderstand, just to charge your mobile device (but also must open the projector power) does not support the direct playback of audio and video content in mobile hard drives and other devices. But I think if you could build a player module, wouldn’t it be more expensive and the cost wouldn’t increase too much? Of course, the volume may have to sacrifice some. Also look at the instructions, you can choose wireless support equipment (wirelessHD-kit, WirelessAndroid-Kit, WirelessCAST), but I searched, did not find any more relevant information, it is estimated that this USB port is also reserved for these devices.
On the back is the power button and the menu button. The light on the Acer logo is reflective and there is no built-in light.
On the right side of the machine is a horn
On the left is a speaker + a fan. Along with the front lens, there are a total of two fans and you can cycle.
Based on the previous tilt adjustment wheel, does the bigger point support better? 
Another big eye Meng, ready to start the test.
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Second, the real machine test
Press twice the power button, smoothly boot
This test is to put a white wall on the bedside of the bed as the screen, the distance from the projector to the wall is 1.8 meters, the actual wall throws the screen size is 222X136.5cm, the basic is the 100-inch screen, and this claim is It is exactly the same, such a short distance can project such a huge screen, Acer still seems to work hard. However, there is no zoom function, I will feel a bit inconvenient when actually used, especially at home, after all, is not a lot of good place to place the projector, so if you can adjust the zoom it would be more convenient.
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In order to restore the actual color and contrast performance of the K138ST as realistically as possible, the following picture shows the test I shot with a sony a7+FE55 1.8 lens, on a tripod, aperture priority mode, aperture 6.3, weighted metering, indoor white balance, ISO auto The camera is about 3.2 meters away from the screen. The room was photographed with a sliding door on the left side of the screen. The outside balcony was unobstructed and was shot in the afternoon.
At the same time, in order to better reflect the performance of the projector, each kind of test filmed the performance of the two situations of full-blind opening, blind curtain, and shade cloth.
2-1: Static Picture Display Test
The photos shown were all taken by a Sony A7+FE 55 1.8, JPG 5333X4000, and were not processed.
The sequence on the top of the picture below is the original film, no curtains are pulled, and the curtains and shade cloth effects are finally applied.
Picture 1.
Picture 2.
Picture 3.
Picture 4.
Through the comparison of the above photos, I believe that it is not difficult to see that in the indoor natural light environment, the K138ST projector can achieve slightly better color and contrast than an ordinary projector, but it can only be said to be slightly better. But under the condition of dark light, no matter human skin color or large contrast environmental color, it can be compared with real performance and reduction. The effect is quite satisfactory.
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2-2: Text Display Test
In a commercial environment, text display is also critical.
This time, it was Chai Jing's "See" PDF e-book to test, the order is still the original manuscript (PDF computer screenshots), and then the indoor natural light finally pulls the blinds to no light.
1. Cover display
2. Text
3. Text
Needless to say, the performance in the low-light environment is definitely better. This is actually nonsense. The projectors of others are not like this. Compared with the display of pictures, the text does not have so many colors and levels, so even under normal indoor lighting, It is also completely legible and hardly affects reading.
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2-3: Video Play Test
Of course, K138ST is mainly for family customers, video playback should occupy more time for the final consumer, so this part of the performance is the most important, and K138ST also has a Cheats: ambient light detection automatically adjusts Acer LumiSense+ Technology. Of course, in addition to the picture quality of video playback, there is a focus on audio processing. K138ST has two 3W built-in speakers that support DTS. Take a look at such a small body. If you look at such a small power, I don’t want to report too much. When you watch the following video, remember to bring your headphones and experience it together.
This shot is still sony a7 + FE55 1.8, set the same, the camera is 3.3 meters away from the screen, 1.5 meters from the projector, the doors and windows are closed when shooting, the outside of the basic interference noise is ruled out. All video is played through perfect decoding on the laptop, VGA input + normal audio line input projector.
The order of the pictures and videos below is still a video computer screenshot, normal indoor light, and curtains + shade cloth.
Video 1: Taoist Down MP4, 1280x534 resolution
Computer video screenshots 
Normal indoor light playback:
Pull on the curtain + shade cloth to play: (The two posters at the beginning of the post were also shot during this period)
Video 2: American Opera Tyrant (tyrant) 1280x720 resolution
Computer screenshot:
Normal indoor light playback:
Pull on curtains + shade cloth to play:
Video 3: 4K demo video, 3840X2160 resolution
Computer screenshot:
Pull on curtains + shade cloth to play:
Through the comparison of the above three videos, in the indoor natural light environment, even if the K138ST has Acer LumiSense+ Technology's TAC technology, but can not change the screen's own light and dark and natural light interference, so only It's okay to say it, but it's not a shock to the world. It's still unrealistic for people to win.
Of course, in the low-light environment, the performance is quite commendable, colorsafe (color fidelity) technology in ensuring the richness of color while also seeking true reduction, that is not monotonous and not over-rendered. The dynamic black level technology can also provide a good contrast between brightness and darkness. The black should be black, white, white, and not ink. In fact, there was still a little bit of concern about the ability of this 800-lumen LED light bulb to perform in high contrast animations. Now it seems that you are worried about it.
In order to test the actual capabilities of the Acer LumiSense+ Technology, I put a DVD of the Nemo mobilizer. A total of 3 minutes of video was recorded. The curtain was pulled one minute before. In the middle of the minute, Pulled open, the last minute will continue to open - close - open the curtains. The change of ambient light can be noticed in the video recording, but apparently it is not a particularly noticeable difference. Therefore, Acer LumiSense+ Technology should still play a role, otherwise it would be better to estimate natural light. So you still have to add points.
Of course, in addition to the performance of the screen, how do you feel about the performance of the sound when you bring your headphones?
The sound in the video is the projector's volume up to 80%, the camera is about 1.5 meters away from the projector, and is recorded live. When I started to broadcast my first video, I was really shocked by the small speakers. Two 3W speakers were very effective in restoring the vocal and background sounds. The subwoofer also performed well and it was actually true. The effect of a bit of surround sound, DTS really deserved reputation
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2-4: Other Features
In addition to these basic functions, let's look at what other features the Acer K138ST has.
1. LumiSense+ adjustment function. When watching a movie or some big contrast photo, you can switch 'Auto Bright' to 'Dynamic Black'. You can see from the photos below that the contrast in the 'Dynamic Black' mode is noticeably enhanced and the menu bar's black is even darker. .
2. Do not forget that the K138ST can be connected to an external Bluetooth speaker, although I personally are very satisfied with the built-in speakers. You can connect to your Bluetooth speaker or Bluetooth headset with simple settings, but I tried to connect the Bluetooth of the phone and the result is not searchable. If you watch a movie at home or watch a game at night, bring a Bluetooth headset, it feels and the effect of Bluetooth output is still great!
3. Maximum digital zoom function of 1.7 times. Look at the picture below, the subtitles really get a lot bigger. When you meet the picture you need to see clearly, you can enlarge it.
4. Fixed screen function. Press the 'freeze' button on the remote control, you can do a careful analysis of the still picture and study, of course, in fact, I think very tasteless features.
5. The aspect ratio of the screen can of course also be changed. There are multiple modes for you to choose.
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Third, the summary
Let us talk about the advantages:
The head is really small, light and small enough, and the little girl in the bag can easily squat.
Ultra-short focal large screen, 1.7 meters 100 inches, no imaginary, really 牛逼.
Compared with traditional light bulbs, LED bulbs not only have a longer lifespan, but also do not lose lumens, and heat dissipation is much better. During the test, the system was turned on for 4 hours continuously. The air conditioning was not turned on in the room, and the heat was completely acceptable. The shutdown fan was able to stop. The fan noise in the machine is well controlled and basically does not interfere.
The ambient light detection (Acer LumiSense + Technology) technology, although it does not completely remove the influence of ambient light, the availability of the basic indoor natural light is still good.
The colorsafe and dynamic black level techniques are a great way to restore true colors.
Built-in DTS stereo speakers, the effect is quite shocking, more than expected, watching movies without external audio.
Supports Bluetooth-connected speakers and headphones to give consumers more choice and convenience.
The whole machine and LED light bulbs are provided with a 2-year warranty, and consumers can use it with confidence.
Let me talk about improvements:
Can't zoom. Although it is an ultra-short-focus large screen, it is not as convenient as a company's conference room to place home. After all, it is recommended to add a zoom function, which is more convenient.
Can I have built-in decoding and playback software? In this way, you can get rid of the computer, and directly play U disk and mobile hard disk video data or text data, not more portable. Of course, this may have some overlap with the MHL function, but considering the limited popularity of the current MHL, it can still consider increasing.
Many slightly more complicated functions can only be set by remote control and cannot be pressed on the body. After all, such a small remote controller can easily be found.
Wireless connection equipment looks like it is not listed yet. If it can be listed simultaneously, it can make K138ST a more nirvana.
Right and right, before the end, share the feeling of watching 3D movies with K138ST again. Because you have to wear glasses to see, you can't show pictures and videos to everyone. You can only rely on everyone's brains to look at 100-inch 3D. The big screen can be more real than you look on the TV or monitor, especially what kind of 3D meat futons and the like, the girl inside beckons to you, do not really run forward oh
In short, if you are planning to purchase a projector for your home, you can seriously consider the Acer Acer K138ST LED new light portable home projector, in addition to the advantages presented above, the life of the LED bulb (at least 2-3W hours) is also Obviously longer than traditional light bulbs, and with DLP function do not have to worry about the late decay.
If you don't have a plan to purchase a projector yet, you can start thinking about it after the A shares return to 4500. After all, the 100-inch big screen is really quite cool. Watching a movie is a lot of fun. Not to mention that it's more realistic to have 3D glasses. Of course, when watching a special cartoon, remember to tie yourself to a chair or sofa. First, avoid rushing out