Making the TV screen at home as transparent and bright as glass, which sounds like a scene from a science fiction movie, has become a reality. On August 11, Lei Jun, the founder of Xiaomi, launched a “transparent TV” at the 10th Anniversary Conference of the brand: it can broadcast video content normally like traditional TV, and it is like a piece of transparent glass, which can let users have a “panoramic view” of the wall and ornaments behind the TV. < / P > < p > this is not the first time that the concept of “transparency” is featured. In fact, as early as 2010, Samsung launched a concept laptop with a transparent OLED screen, which allows users to run windows on a translucent screen and operate directly with touch. Many manufacturers, including LG and Panasonic, also have layout in this field. < / P > < p > so, how is the display screen “transparent”? According to the relevant technical personnel of Xiaomi, compared with the LCD (liquid crystal) scheme which needs backlight to display images, the OLED screen has the inherent advantages of making a “transparent TV” because of its self luminous characteristics. In the process of research and development, technicians add nearly 50% area of “transparent sub-pixel” in wrgb4 sub-pixel of conventional OLED screen, so that nearly half of the pixels on a screen are completely transparent. Finally, when “such a transparent area is large enough and evenly distributed, it achieves a high degree of transparency visually.” At the same time, “the other half of the display area composed of wrgb also has more than half of the pixels to display the image”, so the display of color image can also be taken into account. However, the proportion of “transparent sub-pixel” is less than 50%, which also makes the transparency of “transparent TV” not very high, most of which can only maintain about 30% – 40%. Affected by this, at this stage, this kind of product can get the best viewing effect only when the light is relatively dim or under the background of all black walls. Otherwise, the dynamic display of the TV picture and the clutter of the background picture at the same time, one virtual and one real, on the contrary, will interfere with the user’s visual perception and affect the comprehensive experience. < / P > < p > industry insiders say that “transparent” displays have initially possessed the capacity of mass production, and the only factors affecting its large-scale market entry are still the problems of cost and application scenarios. Taking “transparent TV” as an example, although it is very impressive and full of future sense, it still lags behind the traditional TV at the same price in terms of color presentation and clarity, and its practicability still needs to be improved. In contrast, “transparent window” and “transparent billboard” with lower cost and more timely market feedback seem to be favored by manufacturers. For example, LG has previously demonstrated its “transparent window” design based on Museum scenes. In this scheme, the glass used to isolate the collection from tourists is replaced by OLED transparent display screen, which can meet the needs of tourists to watch the collection closely and understand the relevant background information dynamically and in real time. In addition, the display angle and AR / VR or holographic projector are used to display the transparent display The display screen can also present more three-dimensional graphics to enhance the user experience. In addition, the transparent screen can enable the future traffic and other fields, and provide real-time data such as vehicle speed and road conditions for drivers without blocking the windshield of vehicles. < / P > < p > another issue of great concern is that transparent windows, transparent keyboards and transparent TVs have been put into commercial use. Will transparent mobile phones be far behind? At present, in addition to the screen, there are battery, camera, motherboard and other components in the mobile phone, which are the elements that hinder the mobile phone from becoming transparent. In contrast, transparent TV can choose to “external” the non transparent components in the lower host, but the components in the mobile phone must be integrated into the body in theory, which makes it impossible to realize the true “transparency”. < / P > < p > in addition, like transparent TV, transparent mobile phones may also have problems such as high appearance and strong sense of technology, but the price is too high and the practical value is low. Therefore, although it is worth looking forward to, I’m afraid it will take several years to use a truly transparent mobile phone.