Home ยป The cinema is not as clear as the HdTV at home, you know?

The cinema is not as clear as the HdTV at home, you know?

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Many people may think that the major manufacturers have been to improve the resolution as the direction of future product development, especially TV manufacturers, but as long as a careful analysis of these products, you will find that these products have obvious benefits to the experience of improving not the resolution, but the color, brightness and other parameters, such as support for high color gamut. The reason why major manufacturers emphasize the change of resolution is largely because “resolution” can be more quickly and simply understood and accepted by consumers, reducing promotion costs and obstacles. So I think if you are still blindly pursuing resolution, and ignore the improvement of display color, you are really being led astray by them (most domestic manufacturers are still using the older Rec.709 color gamut standard, which has poor support for high color gamut).

In fact, most people pursuing resolution improvement is essentially hoping that the home TV experience can be like a movie theater, before friends around me often ask me why the home 4K TV clarity always feels worse than the movie theater? I think most people should also have such a feeling. If you want to check the information, in fact, you will find that most of the cinema projector resolution is 2K, and the 4K cinema hall on the market can be said to be few and far between, but why would we instead feel that the cinema is better than the 4K TV at home? There are actually several reasons for this.

Pixels are different, creating natural differences

The projector and home projector on the market mainly uses DLP projection technology, which displays the picture mainly relies on the DMD display chip. the DMD chip is distributed into millions of micro-mirrors, each micro-mirror represents a pixel, to Polaris H2, for example, it uses 0.47 DMD on the distribution of 2.07 million micro-mirrors, so as to achieve a 1080P resolution display, as shown in the figure below .

The DMD micro-mirrors themselves do not emit light, it is dependent on the reflection of different colors of light to achieve color display, that is to say, each pixel hit with red light, it is a red pixel, hit with green light, it is a green pixel, which also creates a unique pixel structure of projection.

In contrast, the familiar TV screen is composed of three sub-pixels in parallel, as shown in the figure below. The simple understanding of TV screen pixels is to divide the original projection of a pixel into three to display different colors, so when the TV displays red, the green and blue sub-pixels are closed, compared to the projection of two-thirds of the pixel area, the human eye will be more likely to feel the grainy TV screen.

Looking at the diagram above, we can also see that the three sub-pixels “red, green and blue” are not closely connected, and there is a physical structure in the middle of the invalid area, which makes the opening rate of the TV screen is much lower than the DLP projector technology (DLP projector opening rate can reach 90% or more), which simply means This means that there are many more invisible areas (the black parts we see) in one pixel of the TV, and the gap between each pixel is bigger. The low opening rate directly leads to poor continuity and a strong sense of grain in the whole picture of the TV, especially in the larger size of the TV, this sense of grain will be further amplified. So, in fact, the 55-inch 4K TV on the market is largely to use high resolution to make up for the low opening rate and sub-pixel parallel structure resulting in a sense of grainy picture. See here, you should be able to understand why we feel that the cinema is better than the home 4K TV effect.

The body “deceives” you, big is clear

When we talk about resolution, often zoom in on the picture to observe the details for comparison, this comparison in 720P and 1080P comparison, we also easier to feel the difference, and put into 1080P and 4K, want to feel the difference in clarity, we need to focus more. This is because our brain can access a limited amount of information per unit of time, when the amount of information (resolution) exceeds our brain ceiling, we can only invest longer time to get more information to feel the difference. Therefore, the increase in resolution, the effect on our actual perceived clarity effect is not linear, but with higher and higher resolution, the perceived clarity of the increase is smaller and smaller.

The standard IMAX screen is 22 meters wide, 16 meters high, in the viewing, the screen size is much larger than the TV at home, our field of view is filled by the giant screen, the brain to increase the amount of information, and in the brain can obtain a limited amount of information per unit of time, the original our brain for the picture resolution of information access is also reduced accordingly. This makes our perception of resolution in the cinema or when using projection is not as strong, but will also be because the screen is larger, access to more content, feeling that the large screen picture is clearer and more shocking.

Most TVs on the market cannot render cinema-quality color

DCI-P3 is the color gamut standard for the color film industry’s unified shared coding, which is the standard for shooting Hollywood movies. The majority of TVs on the market still use the Rec.709 color gamut standard (except for high gamut TVs), which has a much lower green and red coverage than the DCI-P3 color gamut standard used in digital cinemas, so cinemas are often able to present richer and more realistic colors than the TV at home, giving a better viewing experience than the TV at home.

4K TVs run 1080P video sources, all with the help of algorithms

The movie production process is very complex, and is simply divided into several parts: pre-production, post-production, approved release, finished film transmission, and cinema screening. In terms of 4K movies, both pre-shooting, film storage, post-production, and theatrical playback require specialized 4K equipment. The full 4K output cost is high, but the profit and effect brought and is not obvious, which leads to less 4K films on the market, so we usually play most of the 4K TV at home is actually 1080P content, or even 720P content. Low-definition films played on 4K TVs, in order to fill the entire back will be stretched processing, this process will produce a picture of noise, giving a sense of lack of clarity, so manufacturers also need algorithms to deal with the noise, such as the Mstar6A938 chip on the SR technology. Of course, with the launch of CCTV’s first 4K channel last year, as well as the increase in 4K content sources on various video platforms, the problem of few 4K sources has been solved to some extent, and will soon be completely solved.

See here, can be summarized, 4K TV sets want to have a cinema viewing experience, need to improve the pixel opening rate, screen size, color gamut and strengthen the construction of 4K content ecology, rather than simply improve the resolution so simple. The projection display technology has the inherent advantages of high opening rate and screen size, and the color gamut has been greatly improved by the laser light source and the new color wheel technology, for example, the Polaris laser TV Hao-LUNE 4K has achieved a wide color gamut of P3. 4K content ecology, we released Polaris dual color 4K laser TV T1, we cooperated with 4K Garden to provide users with a large number of 4K content sources, and with the launch of CCTV’s first 4K channel last year, the 4K content ecology has become increasingly mature.

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