TV screen best size and material selection [detailed explanation]

How big a TV size should we buy? In fact, there is really no accurate answer to this question. Because there are different reasons, such as different personal preferences, different room sizes, etc., there is no perfect answer. So today, Xiao Bian has taught us how to choose according to the screen size and material of the TV.



Consider the appropriate size according to the living environment

If the place is large enough, the range we can choose is naturally a bit looser. At this time, we can estimate the size of the model based on the viewing distance, which is relatively suitable. In the case of long-term viewing, it will not be because of the screen. It is too small and the picture is not clear, the font is not obvious, and it is not because the screen is too large and the sense of oppression is too strong. Eyesight is overused. It is recommended that the friend who intends to purchase is best to personally experience it in the appliance store. Try to fix a machine for 10 minutes or so under a certain distance to determine the size of the screen that he can accept.

According to the different sizes of current mainstream TVs, in order to make everyone watch TV healthier, there are two ratios below. We summarize the best viewing distances for all sizes of flat-panel TVs and hope to help everyone.

The best viewing distance of a 4:3 TV

Nominal screen actual screen width Screen height Best sight distance

14 inches 12 inches 12 x 1.524 = 18.28cm 55-92cm

21 inches 19 inches 19 x 1.524 = 28.956cm 87-145cm

25 inches 23 inches 23 x 1.524 = 35.052cm 105-175cm

29 inches 27 inches 27 x 1.524 = 41.148cm 123-205cm

34 inches 32 inches 32 x 1.524 = 48.768cm 146-244cm

38 inches 36 inches 36 x 1.524 = 54.864cm 165-274cm

43 inches 42 inches 42 x 1.524 = 64.008cm 192-320cm

50 inches 49 inches 49 x 1.524 = 74.676cm 224-373cm

60 inches 59 inches 59×1.524=89.916cm 270-450cm


Second, 16:9 TV's best line of sight

Nominal screen actual screen width Screen height Best sight distance

28 inches 26 inches 26 x 1.245 = 32.37cm 97-162cm

32 inches 30 inches 30 x 1.245 = 37.35cm 112-187cm

36 inches 34 inches 34 x 1.245 = 44.82cm 134-224cm

42 inches 41 inches 41 x 1.245 = 51.045cm 153-255cm

46 inches 45 inches 45 x 1.245 = 56.025cm 168-280cm

50 inches 49 inches 49 x 1.245 = 61.005cm 183-305cm

60 inches 59 inches 59×1.245=73.455cm 220-367cm


Third, the best line of sight for flat-panel TVs Flat-panel TVs, represented by liquid crystals and plasmas, are very different from CRT tubes in terms of technical principles or design styling. Its common feature is light, thin, high-definition, and a soft look and feel. With regard to the best sight distance, the International Radio Consultative Committee (CCIR) is defined as that when the viewing distance is three times the height of the screen, the HDTV system display should be equal to or close to that of a normal sighted person viewing the original scene. Or presence feeling during presentation.


Several issues that need attention

Effective perspective: The so-called effective perspective refers to the smallest point of view that the human eye can distinguish between two points. As far as the human visual range is concerned, within 10° is the visually sensitive area, that is, the central visual field, which has the strongest resolving power to the color and details of the image; within 20°, it can correctly identify the graphical information, 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°.

Resolution: The detail 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) as shown. 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.

Appropriate location: The placement of the TV 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.

TV screen material selection

Everyone should be familiar with IPS hard screens. At present, the most popular mobile phone used by all is the IPS hard screen, which is characterized by rich colors and extremely wide viewing angles that can be approximately 180 degrees parallel. However, because of its excellent color performance, IPS has achieved perfect performance for different colors, but there is a phenomenon of light leakage. Compared with VA screens, the performance of the black field may not be so pure, so each There are all good, every technology can not be perfect.

The soft screen is divided into MVA and PVA, all belong to the VA screen, use the hand to press the LCD panel, the first panel will have a small amount of water ripple or plum blossom. MVA screens usually come from Taiwan's panel makers, such as AUO and Chi Mei. The panel they manufacture is generally used in medium and low-end TVs. Its advantages are low cost, color gamut, and color expressibility, but the disadvantage is that the viewing area is small. If you sit away from the front of the TV, you may see great distortion in your TV viewing. In addition, the transparency is not as good as the other two screens.

Compared with PVA, which is also a soft screen, PVA has good performance in brightness and contrast. Compared with MVA, the performance of the color and the performance of the black field are relatively perfect. The viewing angle is wide, and the viewing position is not too biased. And see the situation of the screen deformation.



Hard screen, soft screen main difference

The life of hard-screen LCD is 70,000 hours, and the life of soft-screen LCD is 60,000 hours. Hard-screen response is faster, more layered, and the motion picture presented is smoother. The traditional soft screen may suffer from large-scale image distortion and color changes due to the “motion blur effect”. At the same time hard screen power consumption lower than the soft screen.


The current LCD panel, more common, the following are the mainstream

The TN panel is called Twisted Nematic. Because it is inexpensive, it is mainly used for entry-level and mid-range LCDs. It is also a relatively common panel type.
Advantages: high response time and low price.
Disadvantages: thin colors, poor ability to restore, transition is not natural.

The IPS panel is called In-Plane Switching (Plane Switching) and is an LCD panel technology introduced by Hitachi in 2001. This is followed by the S-IPS panel (also known as Super IPS technology or second-generation IPS technology).

Advantages: Large viewing angle, fast response (compared to VA panel display), accurate color reproduction. The price is relatively high.
Disadvantages: The light leakage problem is serious, the black purity is not enough, and the light transmittance is poor.

The VA panel is called Vertical Alignment, the earliest wide viewing angle LCD panel technology. There are two technologies, MVA (Fujitsu) and PVA (Samsung). At present, PVA basically can not see, mainly MVA panel.
Advantages: Large viewing angle, more pure black appearance, high contrast, accurate color reproduction.
Disadvantages: The power consumption is relatively high, the response time is relatively slow, the uniformity of the panel is general, and the viewing angle is slightly inferior to the IPS.

In Xiao Bian's opinion, there is no absolute, at the same time these technologies are relatively mature, and there are no obvious advantages or disadvantages. Therefore, we should choose the most suitable product based on our own needs and funding, or we can also pay more attention to discounted information, so that everyone can spend the least money to buy the most desirable products.

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