How is the dot pitch of the liquid crystal display calculated?

In principle, there is a net cover in the fluorescent screen of an ordinary picture tube, and there are many fine holes on it, so it is called a "shadow-type picture tube." The beam from the electron gun passes through the holes, illuminates the designated location and excites the phosphor, and then shows a spot. Many different colors of dots are arranged together to form a colorful picture.

It can be seen that the number of small holes in the shadow mask is very important. The more points the screen has, the more points there are and the finer the picture. The total number of points on the shadow mask is determined by the size of the picture tube. Without considering other factors, the 17-inch 30% more holes than the 15-inch picture tube increase the picture by 30%. Accuracy. However, as long as the distance between two small holes in the shadow mask is reduced, that is, the number of small holes per unit area is increased, the accuracy of the screen can be improved as well.

The unit of measuring distance is millimeter (mm). However, there are many different measurement methods for point spacing. The distances between the actual points, vertical points, and horizontal points are different. The vertical point distance is equal to half of the distance from the three same-color fluorescent points to the triangular oblique line, which is equivalent to half of the point distance (side length). The horizontal point distance is actually the height of the triangle formed by the three same-color fluorescent points. We know that the height of the equilateral triangle is less than the side length. Therefore, the horizontal point distance is smaller than the actual point distance.

Taking a 17-inch, 0.28mm dot-pitch display as an example, it can display up to 1024 points in the horizontal direction and up to 768 points in the vertical direction, so the limit resolution is 1024*768. Exceeding this mode, adjacent pixels on the screen will interfere with each other, instead making the image change unclear. The current pitch is mainly 0.39, 0.31, 0.28, 0.26, 0.24, 0.22mm and other specifications, the smallest can reach 0.20mm. In general, small dot pitch and good convergence performance can achieve better display results.

Common liquid crystal display dot pitch table:

12.1" (800 x 600) - 0.308 mm 12.1 inches (1024 x 768) - 0.240 mm 14.1 inches (1024 x 768) - 0.279 mm 14.1 inches (1400 x 1050) - 0.204 mm 15 inches (1024 x 768) - 0.297 mm 15" (1400 x 1050) - 0.218 mm 15" (1600 x 1200) - 0.190 mm 16" (1280 x 1024) - 0.248 mm 17" (1280 x 1024) - 0.264 mm 17" widescreen (1280 x 768) - 0.2895 Mm 17.4 inches (1280 x 1024) - 0.27 mm 18 inches (1280 x 1024) - 0.281 mm 19 inches (1280 x 1024) - 0.294 mm 19 inches (1600 x 1200) - 0.242 mm 19 inches widescreen (1440 x 900) - 0.283 mm 19-inch widescreen (1680×1050)-0.243 mm 20-inch widescreen (1680×1050)-0.258 mm 20.1 inch (1200×1024)-0.312 mm 20.1 inch (1600×1200)-0.255 mm 20.1 inch (2560×2048) ) - 0.156 mm 20.8 inches (2048 x 1536) - 0.207 mm 21.3 inches (1600 x 1200) - 0.27 mm 21.3 inches (2048 x 1536) - 0.21 mm 22 inches widescreen (1680 x 1050) - 0.294 mm 22.2 inches (3840 x 2400)-0.1245mm 23-inch widescreen (1920×1200)-0.258mm 23.1 inch 1600 × 1200) -0.294 mm 24-inch widescreen (1920 × 1200) -0.27 mm 26 inches wide (1920 × 1200) -0.287 mm