[Home Theater Network HDAV.com.cn] From the day when the first 4K projector was launched, the debate about the 4K projector is true 4K and pseudo 4K has not stopped. In fact, the so-called true 4K and pseudo 4K dispute, in the final analysis is the original resolution dispute. True 4K home projectors are home projectors that use native 4K resolution chips, and those that use native resolution 1080p projection chips rely on image quality technology to increase resolution to 4K resolution. Strictly speaking, it cannot be regarded as a true 4K projector. So how do you tell the native resolution of the chip of your home projector? 4K resolution Before we can distinguish the native resolution of the home projector, we need to understand the 4K resolution. 4K resolution is an emerging standard for the resolution of digital cinema and digital content. The name of 4K comes from its horizontal resolution of about 4,000 pixels. Because the actual situation in different application areas is different, because there are currently a variety of 4K resolution. For example, the 4K resolutions common in the film industry include Full Aperture 4K (4096x3112) and Academy 4K (3656x2664), while 4K Ultra HD digital movies refer to digital movies with a resolution of 4096x2160, that is, 4 thousand pixels in the horizontal direction. The highest rate digital film, which is also determined by the imaging format of the 4K camera. However, in the TV field we are most familiar with, since the screen ratio of 16:9 has become mainstream, the 4K of the TV industry refers to the physical resolution of 3840x2160, which is equivalent to turning 1920x1080 (1080P) in the horizontal and vertical directions. Some time. See here, I believe everyone has understood the meaning of 4K resolution. Then back to the initial problem, the native resolution of the projection chip of the true 4K home projector is preferably 4096x2160, at least 3840x2160. For example, Sony's 4K home projector belongs to the true 4K home projector because it uses a 0.74-inch SXRD chip (native resolution 4096x2160), and uses Sony 4K home projector to watch 4K digital movies (resolution 4096 × 2160) ) Ability to display 4K digital movies point-to-point, giving full play to the full picture quality of 4K digital movies. True 4K home projector purchase It is undeniable that the use of native 4K resolution is an important basis for judging whether the projector is a true 4K projector, but I think that in addition to the need for native 4K resolution, the quality of the true 4K home projector is also very important. Each brand of home projector has its own image quality enhancement technology, whether it is 4K or 1080p full HD. For example, the Motionflow technology and real authoring functions of Sony's home projectors can greatly improve the picture quality. But for a true 4K home projector, because it must be 4K Blu-ray movies, it must be able to support the 4K Blu-ray disc quality standards. These standards are the key reference points for choosing true 4K home projectors. . According to the latest published 4K Blu-ray standard, in addition to the 4K resolution requirements, there are special requirements in terms of image quality: for example, the color gamut should support BT.2020, the color depth should be 10bit, HDR is supported, and the number of frames is 60p. and many more. Therefore, true 4K home projectors must also support these image quality standards. The BT.2020 color space has been positioned by the ITU International Telecommunication Union to target an image signal gamut standard in the 4K/8K era and is also one of the 4K Blu-ray standards. The ordinary Blu-ray standard uses the BT.709 color space. Compared with BT.2020, BT.709 only covers 35.9% of the former color space. BT.2020 is the largest color space in the current display device, covering CIE 1931 color. 75.8% of the space. It is worth reminding that there is still a wide color gamut technology on the market. This technology can only make the color gamut performance exceed the BT.709 standard, and it is still far less than the BT.2020 color gamut. 10bit color depth means that it can display 1.07 billion colors (each of RGB has 2 to 10 powers, that is, 1024 levels, and RGB three colors have 1.07 billion (1024X1024×1024) colors). The current mainstream Blu-ray standard supports 8bit color depth, only 16.77 million colors, and the two-phase comparison can see the gap between 10bit and 8bit. From a practical point of view, a higher color depth can increase the resolution of the picture in three dimensions, resulting in a smoother color transition performance, such as when the video is halo, the color transition around the light source will be more natural and smooth. There will be no color patches. The number of frames represents the number of pictures that the video contains in one second. The higher the number of frames, the more vivid the picture is observed by the human eye, and there is no intermittent feeling. At present, the number of frames of the ordinary Blu-ray standard is 24p, and the requirement of the 4K Blu-ray standard is 60p, so if the 4K home projector supporting 60p frames is more smooth when playing 4K Blu-ray movies. HDR is probably the most familiar concept, because the current mainstream 4K TV already supports HDR. HDR refers to the high dynamic contrast, which is reflected in the picture to be able to take care of the dark parts and highlights at the same time, bringing a dynamic range closer to the human eye. The essence of HDR is the range of brightness, also known as the level of brightness. For example, in the same picture, the darkest pixel brightness is 1cd/m2, and the brightest pixel brightness is 10000cd/m2. You can see very clear dark details and highlight details on HDR-enabled projectors. But for the traditional support SDR projector, you can't see the minimum brightness of 1cd/m2 and the highest brightness of 10000cd/m2. You can only see a black or a group of bright. At present, many home projectors support HDR. Among them, Sony's VPL-VW558 4K home projector is particularly outstanding, because it not only supports HDR, but also allows users to freely adjust the brightness of the screen in HDR mode according to the brightness of the environment. The viewing experience is more comfortable. Having said so many quality technologies, I just want to let everyone know that in fact, 4K digital movies incorporate a lot of high-definition details and effects that movie directors want everyone to see, but if your display device can't support them. Quality standards, then you can't see what the directors want you to see. This is why I think that choosing a true 4K home projector must support these image quality technologies. Written at the end Seeing this, I believe that everyone has already understood what kind of 4K home projector is a true 4K home projector, but also knows which image quality standards need to be supported by a good true 4K projector. Finally, I wish you all the best 4K home projectors. More fresh and fun home theater information, please pay attention to home theater network http:// (WeChat: cnhifi), the country's most influential home theater audio player interactive media website.
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