This is the secret to creating a ‘unique’ transparent TV from Xiaomi

Tram Ho

At Xiaomi’s 10th anniversary press conference on August 11, the surprise launch of the transparent TV surprised everyone. After the press conference, discussions about this unique TV went viral on social networks and technology forums. So how exactly did this transparent TV come to be?

Get out what’s unnecessary

The TV’s appearance has long been fixed, like a “rectangular black box”, with so many components inside that hamper its ability to make it transparent. Therefore, Xiaomi has come up with a new concept throughout the process of making this new product, that is: “Remove everything unnecessary, make sure what remains transparent”.

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Distribution of the internal structure of a regular TV

The first is the back of the TV, usually almost all in black, inside there are many different components such as the T-con board (Timing Controler – the time controller), the power board, the board. These are “unnecessary” parts that prevent the TV from becoming transparent.

But “remove” does not mean “throw away”, these components need to be removed from the display panel area and re-integrated to form an external hardware assembly, then set to bond. Connect to the monitor via a cable for the monitor to function properly.

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Mi Mural TV.

Such a design concept has actually been applied in part on the Mi Mural TV line of “TV murals”, that is to put the excess and heavy weight on the back of the TV for external installation, helping for the rest of the screen is extremely thin and light.

And the separation scheme of the hardware and screen of this transparent TV is similar, but a bit more complicated.

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Structure comparison when disassembling the OLED and LCD screen.

After removing redundant physical components, you can now focus your attention on the home screen. Currently, the types of screen panels commonly used on TVs include LCD (liquid crystal) and OLED. Both can be made transparent, but OLED is self-illuminating diode technology. This feature allows it to have its own structural advantages in making the TV transparent.

Since LCD needs a backlight to display an image, this also determines that even if the LCD panel is manufactured into a transparent TV, it will still appear like a box. This is clearly in contrast to the modern TV’s aesthetic goal of being thin and beautiful. Also, due to the existence of polarizers, its transparency cannot be high. So, regardless of the appearance or display effect, the choice of LCD panel can only be ignored.

The “curtains” principle makes a miraculous change

How does an OLED screen achieve transparency? Please take a window curtain to illustrate it.

On a patterned longitudinal curtains, if the spokes are fully closed, you can see the complete picture, but at the same time the scenery behind is completely blocked.

But if you only open the curtain at an angle, you will see that although the image on the curtains is separated, it does not affect the overall look, but can still clearly identify the textured content on it. . Furthermore, the curtain makes the outdoor scene appear throughout, and the picture and scene coexist.

And this is almost identical to the principle of transparent Xiaomi TV.

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The transparent area is like the state when the “curtain” is opened.

Similar to curtains, the area displayed on the main screen is the “curtain spokes” and the transparent area is the “space between the spokes” after opening. Although the transparent area cannot display an image, if you set the “spacing between the spokes” at an appropriate range and small enough that the human eye cannot detect it, the display area consists of each “spokes” can display a clear and complete pattern, while the “spacing between the spokes” also shows the scene behind. Thanks to that it achieves magical and transparent visual effects.

Deeper from a technical point of view, on the OLED panel of the transparent TV, Xiaomi has designed the RGBW matrix uniquely when only half of the panel is covered with pixels, while the other half is covered by pixels. to be transparent. Consequently, the pixels have a structure of 1920×1080 = 2073600, on a 55 inch transparent screen.

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Compares conventional OLED sub pixels and transparent OLED sub pixels.

In a nutshell, the WRGB full sub-pixels form the “curtain spokes” and are responsible for the display of the image, while the remaining area forms the theoretical “gap between the spokes” and is responsible for transparency. .

Because nearly half of the total pixels are completely transparent, large enough and evenly distributed, the image effect achieves high transparency and the other half also has a good level of visual rendering.

The work of OLED technology, of course, is characterized by high resolution and self-illuminating diodes that help maintain very high levels of visibility.

Take a small step to mass production

Based on the above point of view on the transparency of the OLED screen, it is theoretically possible to create a very simple transparent TV. But Xiaomi wants to do more “crazy” things, mass-produce these products.

If a TV wants to be mass produced, it needs to go through a series of tests and certifications, which is equivalent to weighing the difficulty of producing a prototype device.

How to give “life” to a piece of “transparent glass”?

This needs to be based on the manufacturer’s OBM capabilities. OBM stands for OLEDBasicModule. It deals with the entire process of R&D, system testing and independent OLED module manufacturing by TV manufacturers. This is the “ticket” to assess whether a company can develop OLED independently or not. What Xiaomi wants to achieve is “in the transparent OLED TV sector, Xiaomi is the only company in China that can.”

OBM covers many aspects, such as the surface tempering of the screen. Mi TV LUX adopts physical hardening, which means a full tempered glass is attached to the screen, which improves resistance to force and eliminates potential safety hazards when the screen unfortunately broken. In addition, in the use of screen glue, Xiaomi TVs use UV glue to bond, which helps to reduce the thickness of the screen, while also improving the alignment accuracy, which helps the overall look of the device. have been further improved.

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Simulation of disassembling the transparent TV screen structure from Xiaomi

The external hardware mentioned above is also different from conventional ultra-thin TVs. To ensure the overall look, the transparent Xiaomi TV creatively integrates the hardware and the display into one, which has passed the extremely high structural strength test.

In the core components, Xiaomi engineers have also conducted new technical studies on the heatsink and EMI.

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Hardware component structure diagram of transparent Xiaomi TV.

Because the main frame of the transparent OLED TV is designed to be stacked, the power supplied as a “large heat generator” is likewise equivalent to directly baking the motherboard. To be able to dissipate this part, Xiaomi engineers had to work a lot.

In addition to adding a heat shield between the two devices, they also customized the internal cooling system. Many small heat sinks are designed around. Through intelligent layout and specially designed internal heat dissipation system, every inch of internal space is maximized. Heat is convected uniformly in the shape of the base frame, overcoming the problem of heat dissipation in a small space.

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Cooling structure of Mi TV Lux.

Additionally, a special design step is performed on the motherboard chip’s heatsink, which turns the shell into an external heat sink. Xiaomi also uses high temperature resistant components in the component selection, which helps to ensure the efficient and stable operation of the motherboard.

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EMI anti-interference structure

The structure of the transparent glass screen of Mi TV LUX combines with an ultra-narrow metal frame, the signal line runs through the closed metal base structure, the structure is tightly stacked inside, although it is effective in terms of is displayed, but will generate electromagnetic interference. To eliminate this risk, the manufacturer has taken corresponding measures to address problems that may arise in the early stages of the design. It has been proven in fact that these measures effectively prevent the radiation spill formed by most product structures.

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Xiaomi’s transparent TV costs around $ 2,800.

Mass production of Xiaomi’s transparent TVs seemed like an impossible task, but based on years of accumulation in TV technology, this Chinese company has finally released a miracle product to the world. . This is also an official mark that Xiaomi has become “the first corporation in the world” to produce transparent OLED TVs.

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Source : Genk