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TV programs can be divided into standard definition and high definition according to the definition. SD refers to the cable TV and DVD we currently watch. The resolution of cable TV is 720×576; there are two types of DVD resolution: 720×576 and 720×480. The resolution of HDTV is 1280×720 and 1920×1080. Actually, 1920×1080 has become a global standard. From the above information, it is not difficult to see that the current mainstream flat-panel TVs are suitable for viewing within a distance of 2 meters when watching HD programs.
The larger the size, the higher the requirement for the clarity of the signal source. When testing the same LG55 inch TV, CCTV HD channels and ordinary signals, in the case of a distance of 5 meters and 3 meters, ordinary signals, 3 meters away from the distance will see the picture is somewhat blurred, especially the motion picture, look for a long time Feeling dizzy; HD signal, whether it is 3 meters or 5 meters, very clear, watching the ball so cool.
Therefore, consumers are advised to consider whether the size of the living room and the source of the signal are clear when shopping for oversized flat-screen TVs. If you are watching live TV shows, you are advised to purchase 50 inches or less; if you are watching high-definition discs, Or the majority of channels, the oversized flat-screen TV will have a very good experience, wall decoration is very gorgeous.
For a friend with a viewing distance of 2 meters or so, a 32-inch LCD TV is enough to meet your needs. A 37-inch product can also be considered, and a 40-inch or larger product should not be concerned. Watching large screens at closer distances can result in visual fatigue.
Friends who watch TV at a distance of 2.5 meters can choose a 37-inch product, which is the most suitable for this viewing distance. If the viewing distance is slightly extended (about 2.7 meters), then a 40-inch LCD TV is a better choice.
For watching cable or DVD, the viewing distance is generally required to be 7 times the picture height. In fact, buying flat-screen TVs nowadays is rarely used to watch high-definition video. For a viewing distance of less than 3 meters, a choice of 32 inches is sufficient, a distance of about 3.5 meters, and 40 and 42 inches are suitable sizes. The 4 meter distance is suitable for 46-inch and 47-inch LCD TVs. The viewing distance of 4.5 meters is suitable for 50-inch plasma TV or 52-inch LCD TV. Also pay attention to their own style of decoration. 
Viewing distance and the size of the TV
The larger the screen of the television, the greater the viewing distance required. This is because the viewing angle is limited when the human eye is not rotating. The reasonable distance is required to allow people to see the eyes and head without turning them. Clear every corner of the TV screen. It is generally recommended that the viewing distance be 3-4 times the height of the TV.
Distance between viewing distance and TV
Dot pitch refers to the distance between the pixels on the TV screen. It is proportional to the screen size and inversely proportional to the screen resolution. The screen with high resolution and low dot pitch has better performance on the details of the screen. If you look at the distance too close and the screen is too large, the screen will be obviously meshed, and the flicker will seriously affect the screen effect. Therefore, it is hoped that TVs that are watched in close quarters will not only use small-screen TVs, but also pay attention to the style with the smallest dot pitch. On this aspect, LCD TVs have obvious advantages.
Viewing distance and brightness of the TV
The brightness parameters of the TVs vary greatly from 300-1000 nit. Higher two degrees will produce a harsh feeling, even burning eyes, too low brightness Eyes must be highly concentrated, very easy to fatigue, long-term use of low-brightness products more likely to suffer from myopia. The intensity of light in communication will decrease with distance. Generally, the energy of television is mainly spread in the range of up and down, 160 degrees, and so on. The theory requires that the light intensity transmitted to the human eye is between 85 and 110 nit. This is to ensure visual health. An ideal value. The viewing distance is usually about two-hundredths of the brightness of the TV screen.
Conversion table: 
note:
1, effective perspective
The so-called effective perspective refers to the smallest point of view that the human eye can distinguish between the two points. In terms of human visual range, within 10° is the visually sensitive area, that is, the central visual field, which has the strongest resolving power for the color and details of the image; within 20°, it can correctly recognize the information such as graphics, and it is called the effective visual field; 20° Although the visual acuity and color discrimination ability began to decrease at -30°, it was more sensitive to activity information and the visual acuity at 30° was very low. Traditional television systems have a horizontal viewing angle of approximately 10° at the best viewing distance. They only cover the central visual field, giving people a feeling of viewing the photos; while high-definition digital televisions must give people a sense of presence, they must To achieve a viewing angle of 20° to 30°.
2, resolution
The detailed ability of the human eye to distinguish an image is called resolution and can be measured by the resolution angle. It also reflects the eyesight of the human eye. In terms of magnitude, the resolution angle is denoted by θ, because the actual θ is small, it is roughly proportional to the immediately distinguishable two-point distance, and is inversely proportional to the viewing distance L, ie θ≈d/L(rad)=3438d /L (minutes). The reciprocal of the resolution angle is resolution. Resolution is also related to illuminance and the relative contrast of the scene. People with normal vision, at moderate brightness and contrast, θ = 1'-1.5'. This value sets the basic requirements for the selection of the number of scanning lines for the television system. In the case of a certain viewing distance, if the viewing angles of the two adjacent scanning lines are smaller than the resolution angle, the human eye can no longer distinguish, resulting in a waste of the purchase. If the viewing angle is greater than the resolution angle, there will be a granular feeling, affecting the visual effect.
3, psychological factors
The psychological factors involved in the impact on the quality of television images, which is proved by a large number of experimental data, its impact is comprehensive. This is closely related to the number of scan lines, viewing distance, image aspect ratio, screen size, spatial angle of view, scanning format, and screen brightness. Experts discussed at the "FPD International Forum 2005" forum symposium, and believe that the practice of flat panel displays (FPDs) that pay attention to the indicators is potentially dangerous. The North Sea Island Tree of the Japan Institute of Labor Sciences pointed out that the stress caused by images with high APL (average image level) in LCD TVs is a major cause of adverse effects on subjects. He believes that natural gradients, large viewing angles, improved large-screen high-brightness displays (maintaining peak brightness), and brightness and contrast adjustments are needed.
4, suitable location
The placement of the television should be based on the physiological requirements of the eye. The best viewing distance has been listed in the table, and the distance between the farthest and the closest viewing distance should not exceed 1/3 of the theoretical viewing distance, and its placement height should be slightly lower than the eye level. Excessively high eyes can easily cause fatigue. When you are too low, you need to look down and look forward to fatigue. Of course, it should also be noted that the TV cannot be placed too obliquely. Otherwise, not only the image is unclear, but it is more likely to cause eye fatigue.
Living room LCD TV size selection skills to master the best viewing distance
The spacious and comfortable living room must choose a suitable TV. We cannot blindly pursue the large size of the TV. So how do you choose the size of the living room TV? Excessive size will make the living room crowded; too small, the living room will look empty. Today, Xiaobian teaches you TV size selection tips.