Most people’s childhood memories are full of a super solid and durable “big butt” TV. Nowadays, this traditional TV has been replaced by a larger and thinner flat panel TV. However, some “emotional fans” believe that, in terms of image quality, the 4K HD LCD TV is not as “fart” as it was ten years ago In particular, color reduction and dynamic performance are still beyond the reach of LCD TV. This view is very interesting, is the development of television in reverse? In fact, what we used to say about “big butt” TV is called CRT, which is called cathode ray picture tube (CRT), generally referred to as picture tube TV. Some people think that the quality of CRT TV is better than that of LCD TV, mainly because of the different principle of displaying pictures. < p > < p > LCD TV can be simply divided into three structures: backlight layer, liquid crystal layer and filter layer. Several LED beads are placed in the backlight layer to provide the light source and light up the picture; the liquid crystal layer is responsible for changing the light transmittance. By applying different voltages, the liquid crystal molecules will present different arrangements, so as to control the light and shade of the picture; the filter layer contains three color filters, Responsible for providing color, so that the final display of the screen can be rich in color, alternating light and shade. < / P > < p > the core structure of CRT TV picture display is mainly electron gun and phosphor (the nickname of “big butt” is because it has a large electron gun inside). The phosphor is attached to the inner surface of the screen in three colors: red, green and blue. These closely arranged phosphor dots or bars in a certain way are called phosphor units. Adjacent red, green, and blue phosphor units form a group, which is called pixel. The cathode of the electron gun is heated by the filament after it has three primary color pixels, and the cathode emits electrons. Under the action of the accelerating electrode electric field, the cathode converges into a very fine electron beam through the focusing electrode. Then, by the high pressure of anode, huge energy is obtained to bombard the phosphor layer at a very high speed. Excited by a high-speed electron beam, these phosphor units emit different intensities of red, green and blue light, and produce various colors according to the spatial mixing method. CRT TV can be regarded as a kind of “self luminous” technology, so its brightness, color restoration, dynamic performance, contrast and other indicators are very excellent. The backlight of LCD TV is led light source. Before displaying the picture, it has to pass through the transmission, refraction and reflection of multi-layer optical film (diffusion film, brightening film, etc.) and polarizer and filter, so the brightness and quality of light are greatly reduced. < / P > < p > take one of the most obvious indicators for comparison – contrast. When CRT TV wants to display black, it can directly let the electron beam not bombard that part of the phosphor, which is similar to OLED directly turning off some pixels, so as to display the purest black. LCD TV is subject to the characteristics of liquid crystal molecules, there are always gaps between the molecules, which can not completely block the light. Therefore, we will find that when the LCD TV or the monitor displays the black picture, it will appear white and transparent, which will affect the appearance. < / P > < p > poor color is also one of the reasons why LCD TV has been criticized by enthusiasts. Theoretically, the color depth of LCD panel can only be up to 18bit, and most of the products sold are 10bit. Some low-cost displays even have only 6bit. However, the color depth of CRT TV can be said to be infinite. The transition between colors is quite smooth and there will be no fault. What is the response time of CRT, not to mention, as long as the phosphor is hit by the electron beam, CRT can emit light immediately and the residual glow time is very short. Therefore, the response time of traditional CRT is only 1 ~ 3 ms. However, the deflection of liquid crystal molecules in LCD TV or display takes time, and even the top-level E-sports display can hardly match the response time of CRT. < / P > < p > when collecting data, I found that some CRT enthusiasts not only praised the color of CRT, but also said that the definition of CRT could be better than that of LCD TV. Some people think that because the principle of dot light display image of LCD TV is different from electron beam scanning of picture tube, when the signal clarity is high, it is not as clear and natural as CRT TV. In terms of resolution, the current 4K LCD TV is 3840×2160, while the better CRT TV resolution at that time was only 1024×768. But strictly speaking, CRT TV has no resolution, which is different from the pixel imaging method of LCD screen. The definition of CRT TV is determined by the density of scanning lines. The finer the scanning line is, the higher the TV definition is and the clearer the image is. The actual scanning line of mainstream CRT TV was 420 lines (625 lines in theory), which was equivalent to 640×480 resolution. Later, with the upgrading of display technology and the appearance of rear projection TV, the image clarity of some rear projection color TV sets can reach 720p. But it can only be said that at that time, the definition of CRT was better than that of LCD TV of the same size and grade. At that time, there was no ultra high definition display device to compare, and the TV set was generally only 30 inches, which made us feel that CRT was particularly clear. In terms of definition, today’s 4K TV must be completely due to the old TV ten or twenty years ago. However, the current video definition is often only 720p or 1080p, which is not enough to “feed” the complete 4K pixels. Moreover, the TV’s general size is 55 inches and above, which makes people feel that it is not clear enough. < / P > < p > of course, we can not deny that the image quality performance of LCD is really too ordinary, and there is not much bright spot compared with OLED. Therefore, we can see that some manufacturers are still trying to optimize and improve the quality of LCD TV, such as adding quantum dot film to improve the color gamut of qled, improving the backlight beads to improve the contrast and light control level of miniled, etc. < / P > < p > I personally hope to see a subversion in the combination of software and hardware. For example, 8K has been available for two years, but most video resources don’t even have 4K resolution. It’s futile to have the best hardware. If the TV hardware improves, the software or content can also follow up, then the experience can be called perfect. < / P > < p > at present, the most promising technologies may be HDR and imaxenhanced technology, both of which require a strong combination of software and hardware. Not only should the quality of TV hardware itself be hard enough, but also the video content should meet the corresponding standards. < / P > < p > HDR may be familiar to all of us. Now even more than 1000 TV sets support HDR, but there are many pitfalls here. Not all HDRS are “true” HDRS, and there is a big difference between different levels of HDR. We often see Dolby certification is also a truth, some low-end products are nothing more than spending money to buy a very low-level certification, publicity significance is greater than practical significance. < / P > < p > for display video, HDR has different standards, such as hdr10, hdr10 +, dolbyvision (Dolby vision) and HLG. Although they are all for displaying more realistic images, they have different requirements, specifications and attributes. < / P > < p > in addition, we usually see the display HDR certification mark on some display devices, such as displayhdr400 (brightness above 400), displayhdr600 or displayhdr1000, etc., which is a set of standards for HDR displays formulated by VESA (Video Electronic Standards Association). One thing to understand is that most of the low-end products on the market claim to support hdr10, which is not true support. < / P > < p > imaxenhanced is also an HDR certification in essence. With its proprietary digital program, imaxenhanced can take full advantage of the state-of-the-art HDR video display and enhance contrast, color and clarity. When imaxenhanced movies and documentaries are displayed on the imaxenhanced display, the best visual effect will be obtained. < / P > < p > in short, if you want to have no brain to judge which TV is good, you can directly identify the one with dolbyvision and imaxenhanced certification, and the picture quality and sound quality are absolutely guaranteed. < / P > < p > after the hardware is satisfied, what should I do with the video content? Fortunately, many video platforms have attached great importance to it, and have opened up special high-quality video zones. For example, foreign Netflix and domestic Tencent video have provided HDR zones (including imaxenhanced) and Dolby’s video zones. Some time ago, I had the honor to experience it, and the quality was really very high. Whether it was the definition or the overall picture performance, it was improved several grades compared with the usual network video. In general, CRT was a king in that era, especially in 1968 when Sony launched the TV kv-1310 equipped with trilon tube, which pushed CRT technology to the peak. < / P > < p > this cross era product has been used in CRT TV for the first time, which makes the image quality of CRT display technology greatly improved. Terylene kinescope not only has excellent performance in brightness and color, but also has high color purity. In the field of TV, monitor and broadcast monitor, trilong represents the highest level of image quality. In the past few decades, Sony has sold about 200 million picture tubes and more than 100 million trilon TVs. < p > < p > in 1973, Sony won the highest honor “Emmy Award” in American television industry by virtue of the trilon picture tube. As the highest award in the American television industry, the Emmy Awards recognize people who have made outstanding contributions in the fields of film and television, production, program, television station and technology development, and trilon has become the first electronic product to receive this honor. < p > < p > < p > Time magazine published a list of “the 50 most influential TV devices of all time”. Sony’s trilon TV set ranked second, second only to Apple’s, which was released 39 years later. However, CRT is hard to avoid being eliminated. This reminds me of another king of picture quality technology – plasma. Until today, there are also some people who think that plasma is the peak of TV picture quality. Whether it is CRT or plasma, they are like a specialty. They are really much better than liquid crystal in a certain item, but the advantage of liquid crystal is that it is balanced and conforms to the trend. Large output, cheap, large size, enough quality, these characteristics are its winning magic weapon. < / P > < p > and throughout the history, almost all consumer grade display devices have been developing in a thinner direction. No matter how CRT develops, it is difficult to optimize the huge electron gun. Nowadays, LCD TV can easily achieve the thickness of 1cm or even smaller. It can also be easily made into a large screen of 50 or 60 inches. < / P > < p > however, our pursuit of image quality will never stop. Now we think that LCD TV is still good. Maybe one day, it will be forgotten in the long history like CRT. Global Tech