The clearness of the small-pitch LED display is determined by the line of sight?
Release date: 2017-10-24 Source: LED network share: 
In our common sense, the smaller the spacing, the clearer the LED display will be. Some people say that this understanding is not completely correct, because for the same LED display product, the line of sight will determine the clearness of the viewer’s display. no. To this end, we have specially compiled for you how to calculate the visual distance of the small-pitch LED display to determine the optimal spacing for the purchase.
The theoretical resolution of the human eye is 20 arc seconds, but due to the distribution of photoreceptor cells and its own defects, the resolution of visible light is actually 1 cent. The object with a width of more than 1 cent is merged with the background.
For example, let's calculate the “pitch limit†that the human eye can see at 1 meter. You can simply understand the minimum or minimum straight path that your eye can see at 1 meter ( Less than the above size, then they will dissolve into the background), or can be understood as the minimum spacing that can separate the two small points (wire diameter), less than the above spacing, then they will dissolve into a point or a straight line.
1 corner = 1 / 60 degrees = (2π / 360) / 60 = 0.000291 radians, so the minimum point distance (about equal to the arc length) can be seen at 1 meter: arc length = radians * radius = 0.000291 * 1000mm = 0.291 Mm Below to calculate, we use a 16:9 HD (resolution 1920 × 1080) flat-panel TV screen to illustrate:
1 meter distance corresponds to 25.237 inches
2 meters distance corresponds to 50 inches
3 meters distance corresponds to 75 inches
4 meters distance corresponds to 100 inches
5 meters distance corresponds to 125 inches
The formula back is the formula for calculating the best line of sight in terms of the viewing distance of the LED display.
The optimal line of sight is defined as the smallest distance from the nearest two adjacent pixel illumination points in the normal direction of the front of the screen. This means that you can see a highly sharp image in a visible area that is larger than the optimal line of sight, and you won't feel the graininess of the screen because it has reached the resolution limit of your eyes.
figure 2
The resolution of the human eye mentioned above is 1 cent, which is in a very ideal situation (sufficient bright sunny day and no reflection) for the black strip test on white paper, and is obtained by people with particularly good eyes. In fact, the average person's eyes are not so good. If the experiment results in a dim light, the result will deviate. The human eye is highly sensitive to this pattern and will be 3 to 5 times white on a black background.
In addition, people have a dim light point source (if the brightness of the point source is the same, for example, astronomical binary observation), the person with the best resolution can reach 2 cents, and the resolution of the average person in this case is 3- 5 cents. If you have a near-sighted audience, the resolution of things in the distance will be lower.
So we calculate the ideal situation (calculated by more than 1 cent), the person standing in the area between S1 and S2, can see all the images without losing information, at the golden point Sr is the best line of sight, see The perfect balance between distance and vision.
1 corner = 1 / 60 degrees = (2Ï€ / 360) / 60 = 0.000291 radians; usually 0.000294 radians, 1 / 0.000294 = 3400, the formula:
Minimum line of sight S1 = 3400H; where:
Maximum line of sight S2 = 3400P; P (mm) - LED pixel pitch;
The best line of sight Sr = 1 + 0.618 (S2 - S1); H (mm) - the spacing of the three color LED particles;
This leads to the calculation:
Figure 4 pixel pitch and video projection result table
Viewing angle
Figure 5 viewing angle view
The theoretical resolution of the human eye is 20 arc seconds, but due to the distribution of photoreceptor cells and its own defects, the resolution of visible light is actually 1 cent. The object with a width of more than 1 cent is merged with the background.
If we take the viewing angle and viewing distance of Figure 5, from the comparison table in Figure 4, the P1.5 small-pitch LED display is the most cost-effective, because viewing in this line of sight is the clearest. Clearly these, if you are a smart purchase, I believe that you will not blindly pursue the small spacing.
Label: Is the clearness of the small-pitch LED display determined by the line of sight?
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