"I. Preface: the gospel of bear children should also protect their eyes when watching TV
On April 25, 2017, Jimi held a press conference and officially released its H1s, Z5 and other new products without screen TV. However, the most notable product is imea children's screen TV, which is launched for children.
Why is this product more interesting?
Because this is the first product for children in the screen less TV market, filling a market gap that many people are not aware of.
If readers have children around them or as parents, they can deeply realize that most children have a bad habit of lying in front of the screen all the time.
Whether it's a TV, mobile phone or tablet, children always need a screen to watch animation and play games. Although we all know that watching the screen is bad for our eyes, since we can make the bear children quiet for a while, many people turn a blind eye.
This has always been a pain point, but there was no product on the market to solve this problem, and imea children's screen less TV came for this.
So can its performance meet the needs of bear children? Can you protect their eyes from harm?
2、 Popular science: what is screen less TV? All you want to know is here
"Screen less TV" is a new category proposed by Jimi in 2014, born out of projectors. As a newborn, many people may have heard of it, but most people don't understand it.
Moreover, due to the inextricable connection with the projector, most people are confused about some of their terms and parameters.
For example, "can you buy a projector as a screen less TV?"“ Is there a good TV for TV without screen? "“ How can 1200 lumens be lower than 400 ANSI lumens? "“ What the hell are DLP and 3lcd? " Wait, wait.
If the question comes, the answer is not far away.
1. Is a screen less TV a projector?
The projector is very familiar to everyone and has a wide range of application scenarios. You should have seen a lot in the classroom and the company. I won't repeat it here.
The application principle of screen less TV is the same as that of projector. They are devices that project images onto walls or screens. As for the biggest difference between the two, the author believes that it should be TV content.
The projector is generally a single device and does not provide or contain video image content; The screen less TV is different. It can not only put on the screen, but also often includes an operating system (usually Android), and has built-in many video and live resources.
In other words, a screen less TV is like a TV box with projection function. Buying a projector alone cannot be used as a screen less TV. Therefore, a screen less TV should belong to household appliances.
2. What's the difference between TV without screen and TV?
① Advantages of screen less TV over ordinary TV:
- lightweight and portable: obviously, the screen less TV is very lightweight because it does not need a large screen to display content.
The length and width of screen less TV are generally no more than half a meter, the weight is no more than 10kg, and can display hundreds of inches of content; The 100 inch traditional TV should be at least more than 2 meters and weigh more than 100kg.
- random adjustment: the screen size of the screen less TV can be changed with the change of distance, and can even be enlarged from 30 inches to 300 inches, which is suitable for wall screens of various areas.
The TV is always the same as the inch you buy.
↑ ↑ ↑ it's a problem how to get home with a large TV
- eye protection: This is even simpler. The screen less TV is put on the screen and then reflected to people's eyes. It is a diffuse reflection process. People's eyes will not be very exciting in the past.
And ordinary TV just receives as much light as it emits.
② Disadvantages of screen less TV compared with ordinary TV:
- insufficient brightness: precisely because the screen less TV relies on diffuse reflection to provide pictures, its brightness is often not as good as that of the TV and is vulnerable to the influence of ambient light. The screen less TV with too low brightness is often unavailable during the day. However, with the progress of technology, there are many screen less TVs with brightness of more than 1000 ANSI lumens.
- image quality problem: when the TV has moved towards 4K and 8K resolution, the mainstream screenless TV is still hovering at 1080p.
3. What is the difference between ANSI lumens and lumens?
When measuring projection products, there has always been a very important parameter - lumen.
Lumen (abbreviated as LM) is a unit to measure luminous flux, which specifically means the light energy passing through a certain area in unit time. The greater the luminous flux of the light source, the more light is emitted.
↑ ↑ ↑ unit of measurement related to light
For example, a 40 Watt ordinary incandescent bulb has a luminous efficiency of about 10 lumens per watt, so it can emit about 400 lumens of light.
People familiar with projectors know that brightness is one of the most important parameters. How many lumens they have has always been the focus of their publicity. However, a new lumen unit has appeared in recent two years, which is ANSI lumen.
ANSI lumen is the lumen unit of American National Standardization Association, and the lumen unit commonly used in the market is the lumen unit of ISO (International Standards Organization).
Because the two test methods are different, generally speaking, 1 ANSI lumen = 4 ISO lumens, which is why many projectors do not mark which lumen unit in order to write two more zeros.
↑ ↑ ↑ for example, a projector with the highest sales volume is marked with 900 lumens, but after asking the customer service, the actual parameter is 50ansi lumens.
4. DLP display technology
Imea children's screen less TV adopts DLP display technology, which is one of the mainstream projection technologies in projection products. In addition, there are 3lcd (mainly Japanese manufacturers) and LCOS projection technologies on the market.
↑ ↑ ↑ DLP is a projection technology invented and commercially available by Texas Instruments
Here we mainly talk about the working principle of DLP. The projector has always had an ultimate problem. Different from the LCD screen that can emit color light, we all know that the projector must have a strong white light source to project. How does DLP turn the white light of the light source into various colors?
Before answering, let's clarify two concepts:
First, DLP is a projection technology invented and commercialized by Texas Instruments, fully known as "digital light processing", that is, digital optical processing technology;
Second, DLP has a core component DMD (digital micromirror device), namely "data micromirror device".
Well, the reason why DLP can turn white into color is that it uses two magical props, one is the color wheel and the other is the DMD chip.
The color wheel is a transparent disc coated with 3-8 colors (at least RGB three primary colors). It is the first prop for white light to pass through.
Obviously, no matter whether it is white light or not, as long as it is filtered by the color wheel, it will show one of the RGB three primary colors, and the color wheel rotates continuously in work (the speed is generally more than 200 revolutions per second).
Therefore, through the color wheel, the projector now has an uninterrupted RGB three-color light source. How can these three primary colors form tens of millions of other different colors?
This step is left to the DMD chip. The light filtered by the color wheel in the projector will focus on the DMD chip through the lens.
Before explaining it, we should note that DMD chip is not a chip in the ordinary sense. In fact, it is a very magical optical chip.
How magical is it?
DMD chip is composed of tens of thousands or hundreds of thousands of small mirrors!
These small mirrors on the DMD chip can adjust the angle according to the instruction to determine whether the light shining on themselves will be projected.
Tens of thousands of small mirrors can adjust the three primary colors according to the instructions. Who is reflected more and who is reflected less.
The speed of these small mirrors can reach thousands of revolutions, which can create an illusion to the human eye, mix the fast flashing three primary colors together and see the mixed new colors.
This is how DLP technology turns a piece of white light into a colorful picture. With the two artifacts of color and DMD chip, the projector can display different colors and pictures.
3、 Appearance: small robot with spherical design without edges and corners
1. Imea children's screen less TV
↑ ↑ ↑ imea children's screen less TV outer package
↑ ↑ ↑ the author has an early education version, including a special camera
↑ ↑ ↑ open the lid and the round head of imea children's screen less TV will be exposed
↑ ↑ ↑ fuselage front (back to curtain)
↑ ↑ ↑ back of fuselage (facing the curtain)
↑ ↑ ↑ there is an imea logo and a long and narrow display screen on the front. After power on, power and other information will be displayed
↑ ↑ ↑ the back is from top to bottom, including heat sink, projection lens and infrared detector
This infrared detector is the source of the infrared screen protection function of imea children's screen less TV. When an object appears in the infrared area, imea will automatically stop projection for 3 seconds to protect children from projecting light directly to their eyes. It is very considerate.
↑ ↑ ↑ within the 60 degree area, the screen automatically stops when an object is detected
↑ ↑ ↑ next is the USB and power interface
↑ ↑ ↑ the bottom is the only flat place for imea, in other words, it can only be used flat on the table
↑ ↑ ↑ imea has a 3-watt horn on the left and right
↑ ↑ ↑ standard power line, with power of about 19v1.75a = 33W
It can be seen that imea children's screen less TV has no edges and corners, and is completely a round spherical device, which may also be the reason why children are easy to bump into the device.
2. Remote control and special camera
Imea children's screen less TV is also equipped with a remote control, and the early education edition also includes a special camera.
↑ ↑ ↑ on the front of the remote control, switch, voice, return, home page and volume increase and decrease buttons, and two No. 7 batteries are attached for Jimi
↑ ↑ ↑ back of remote control
↑ ↑ ↑ top of remote control
↑ ↑ ↑ at the bottom of the remote control, there is a volume key function key. Turn on the focus function, and the volume plus and minus keys can adjust the focal length of the projection screen.
↑ ↑ ↑ packaging of imea special camera
↑ ↑ ↑ on the side of the fuselage, it looks very much like a desk lamp
↑ ↑ ↑ ↑ the lamp tube part of the "desk lamp" is a 3 megapixel camera and flash
↑ ↑ ↑ cushion for camera
↑ ↑ ↑ simple instructions are marked on the bottom of the camera
↑↑↑ camera accessories, a jigsaw puzzle, and an early education card marked with letters, numbers and patterns. With these two, you can experience imea's intelligent early education system
4、 Functional experience: UI ar intelligent early education customized for children also has some highlights
Imea children's screen less TV is a product for children. Does it mean that its hardware is also very "children"? The author collected the top three products with sales below 2000 yuan in an e-commerce screen less TV category and made a simple parameter comparison:
It can be seen that the parameters of imea not only do not lag behind the competitive products, but also lead more in performance, contrast and battery. It can be seen that Jimi has maintained a relatively good cost performance while developing imea for children.
Imea children's screen less TV can be operated by remote control, or can be turned on or off by touching imea's head. The official recommends a viewing distance of 2.2M, saying that 32 inch projection is the most suitable for viewing.
1. Hands on operation
After simple preparation steps such as linking the remote control, downloading the application binding, you can use imea children's screen less TV. One of the characteristics of imea is that it shields the content that is not suitable for children, and only built-in healthy genuine content suitable for children.
The main interface of imea has also been modified to a very lovely forest portrait, in which each building or animal is an application, so that children can quickly adapt and learn to operate. In addition, imea will play lovely background music in the main interface.
The main interface of imea mainly includes seven parts: Magic School, story castle, click story, animation world, my study, Jimi mall and settings.
Magic world:
↑ ↑ ↑ the magic world needs to be used with a special camera. The author will experience it in detail later
Story Castle:
↑ ↑ ↑ for the application of listening to stories, imea has many kinds of stories
Click story:
↑ ↑ ↑ imea has built-in click story application, which is different from the previous story castle. It is mainly prepared for preschool children
Animation world:
↑ ↑ ↑ animation application. It is officially said that there are 100000 + hours of children's videos, including piggy Peggy, little Burberry and other animations
My study:
↑ ↑ ↑ what's interesting is that I need to do an arithmetic problem before entering my study, which is also a "safety measure"
↑ ↑ ↑ all installed third-party applications will sit here
It is worth mentioning that imea children's screen less TV has a built-in mango TV application. If the child is not at home, it is not a problem for parents to temporarily "requisition" imea to watch TV dramas.
Jimi Mall:
↑ ↑ ↑ there are only two imea accessories in the mall
set up:
↑ ↑ ↑ ↑ setting also requires arithmetic entry. After opening, there are three settings, namely projection, link and system setting
In the projection setting, you can turn on the eye protection mode specially prepared for children.
↑ ↑ ↑ when the eye protection mode is turned on, you can see that part of the blue light is obviously filtered out in the picture. The implementation method is roughly the same as the eye protection mode on the mobile phone. Combined with the infrared screen protection function, you can reduce the stimulation of TV to children's eyes in an all-round way.
↑ ↑ ↑ you can also turn off the infrared screen function in the setting
↑ ↑ ↑ imea is equipped with a customized system based on Android 4.3, which can be upgraded by subsequent Ota
2. Viewing experience
The biggest factor affecting the appearance of screen less TV is brightness. How about the performance of imea children's screen less TV?
↑ ↑ ↑ turn on the indoor lighting to simulate the use environment in the daytime
↑ ↑ ↑ after closing the door and closing the lights and windows, simulate the use environment at night
For comparison, the author uses Lenovo Xiaoxin air12 (50% brightness, about 150 NITS) to shoot in the same picture.
↑ ↑ ↑ simulating the daytime, the brightness of imea is obvious and can only barely display the picture, which is still much worse than that of notebook
↑ ↑ ↑ simulate the night, and the display brightness is basically the same
Of course, Jimi is not unable to make high brightness products. Imea children's screen less TV may only be made for 60 years in consideration of children's eye protection and cost constraints
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