This article is mainly about the related introduction of 1500r and 1800r curvature, and focuses on the 1500r and 1800r curvature and the change of the curvature number.

The calculation formula assumes that the direct coordinate equation of the curve is y=f(x), and y=f(x) has the second derivative, and the slope of the tangent of the curve at point M is ,and so

also , So the curvature of curve L at point M is Let the curve be a parametric equation Given, using the parametric equation derivation method can be obtained

Curvature circle and radius of curvature

The reciprocal of the curvature at point M on the curve is called the radius of curvature of the curve at this point, denoted by, then

Take a point D on one side of the normal line of the curve at point M, and use D as the center of the circle to make a circle with the radius. This circle is called the curvature circle of the curve at point M, and the center D is called the curvature center of the curve at M.

The circle of curvature has the following properties:

(1) The circle of curvature and the curve have a common tangent and curvature at point M;

(2) It has the same concave direction as the curve near the point M;

Therefore, in actual engineering design problems, a section of the arc of the circle of curvature adjacent to the point M is often used to approximate the curve arc to simplify the problem. [2]

significance

Curvature is a measure of the degree of unevenness of a geometric body. Flat has different meanings for different geometric bodies.

This article considers the basic situation, the curvature of curves and surfaces in Euclidean space. For curvature in the general sense, please refer to the curvature tensor.

In dynamics, in general, curvature is also produced when an object moves at a variable speed relative to another object. This is caused by the distortion of time and space. Combined with the equivalent principle of general relativity, an object moving at a variable speed can be seen as being in a gravitational field, and therefore curvature.

According to the explanation of the general theory of relativity, in the gravitational field, the properties of space-time are determined by the distribution of the "mass" of the object. The distribution of the "mass" of the object makes the properties of space-time non-uniform, causing the curvature of space-time. Because an object has mass, it will bend space-time, and you can think that with speed, mass objects become heavier, and the curvature of space-time curvature becomes greater.

In physics, curvature is usually obtained by normal acceleration (centripetal acceleration), please refer to normal acceleration for details.

"Curved surface" can also be said to be one of the most popular terms in the display industry in the past two years. From curved mobile phones to curved displays, all are the hottest products in the current display industry, which is enough to show the development momentum of curved surfaces. For many consumers, curved products are their favorite.

Curvature refers to the rotation rate of the tangent direction angle of a point on the curve to the arc length, which is the radius value of the curved screen. The curvature 4000R refers to the degree of bending of a circle with a radius of 4m. Similarly, 3000R refers to the radius The degree of bending of a 3m circle. It can determine the image quality and sense of presence of the curved display. The perfect curvature we often say refers to the curvature of a circle with the best viewing distance as the radius.

The smaller the curvature, the better the surround effect. Of course, it also has a certain relationship with the screen ratio, size, and distance of the viewer. But the curvature will have a range. If the curvature is too small, the whole picture will look distorted and uncomfortable to watch; if the curvature is too large, the bending effect will not be obvious, and the immersive feeling of the curved surface will be lost.

Currently, 27/28-inch displays on the market generally only have 4000R curvature, while the 31.5/32-inch large screen is equipped with 3000R curvature. This size and curvature device looks more like a "flat", and the bending effect is not obvious. The method brings an immersive viewing experience unique to curved displays.

The launch of HKCC320PLUS brings the curved display into the 1800R era. The curvature of 1800R means that the degree of curvature of the curved surface is very obvious. C320Plus adopts a large 31.5-inch curved screen with a curvature of 1800R, which fits the habit of human eyes and creates a sense of visual envelopment. Compared with 4000R and 3000R curvature, it looks more comfortable and allows users to experience the immersive feeling.

Samsung Samsung C34F791, equipped with 21:9 aspect ratio quantum dot technology panel, matte matte surface of the panel, providing 4K UWQHD (3440×1440) resolution, 1500R ultra-high curved surface, 3000:1 static contrast ratio, 178°/ 178° Viewing angle, 125% sRGB color gamut performance, 4ms grayscale response. The rear expansion I/O is covered by a bezel, including; 2 HDMI ports, DP 1.2a (with adaptive synchronization), 2 USB 3.0 ports, 3.5mm headphone jack and Kensington security keyhole.

Nowadays, face-to-face LCDs have occupied the mainstream sight of the market for quite a long time. Although performance and technology are constantly digging, they have actually encountered a bottleneck, and it is difficult to get enough freshness in the application experience for players. , So when the curved screen LCD comes on the stage, everyone has deep expectations for it. More and more users have put forward a series of high standard aspirations, eager for the different vision that curved screen products can bring. Shocked and eager to be a part of a new generation of platforms, how can it help the platform to gain more performance? All of this is something that users should consider carefully.

How to choose an excellent curved screen LCD, the parameter of curvature is particularly critical. Most of the products on the market are mainly R3000 and R4000. Such products can be regarded as meeting the basic standards of curved screens, but in fact they are not sufficient. Taking advantage of the curved screen, it is not thorough enough to create a sense of visual surround and wrapping. And from the veteran LCD brand HKC, they are the first to introduce the C4000 LCD with a curvature of R1800. This new product with a more outstanding curved surface effect. The curvature of R1800 is more in line with the visual habits of the human eye. Compared with the R3000/R4000 The product makes the senses more comfortable. Perhaps netizens think this is just a general statement. Let me let the editor analyze the advantages of R1800 curvature from different application perspectives.

The inherent advantages of curved screens in the game scene are no longer a secret. The curved flexible screens can give players a wider field of vision and an outstanding sense of wrapping to ensure a more realistic on-site experience. Especially in the rendering of large and complex game scenes, curved screens can help players feel like they are in a game. The speed of eye tracking increases. Players closely follow the visual focus and gain more accurate insight into the details of the game. Not only that, the curved screen is more excellent in the control of the picture depth of field, and the level of the foreground picture and the background picture is more detailed and obvious. This has a very important auxiliary role for gamers to fully experience the beauty of the game.

In the experience of high-definition movie playback, the characteristics of the curved screen also provide players with a more ideal visual experience, bringing a lot of promotion elements. The curved display shortens the viewing distance from the human eye to the left and right edge areas of the screen, which improves the quality of the entire picture. Instead of facing the screen directly, the picture details at the edge of the screen will be distorted. After all, the excellent curvature of R1800 is a customized curved surface that fully considers the curved structure of the human eye, and the image distortion is greatly reduced. The real picture quality, this is a gem gifted to users by the curved screen.

The R1800 curved screen brings users a higher degree of concentration, and it can help users improve their learning efficiency in an all-round way. The curvature is excellent enough to increase the viewer's attention to the display content, thereby improving the reading efficiency, and products like HKC C4000 also come with DC dimming technology and blue light filtering technology to create a true flicker-free screen effect. At the same time, it greatly reduces the damage of harmful rays to the human eyes, avoids the fatigue of users who use the display for a long time, and improves the comfort of the display in an all-round way. Learning is even more effective.

For white-collar workers who are focused on work, the R1800 curvature of the LCD also has an alternative magical effect. In a multi-screen system composed of general direct-face screens, in the transition part between the screens, the LCD frame is difficult to be ignored, which will inevitably bring some visual experience defects. The display system composed of multiple curved screens is different. The curvature of R1800 not only guarantees an excellent surround feeling, but the influence of the border between the screens will be greatly weakened, and the connection of the screens will be smoother and more natural. You can enjoy the super pleasure of multi-screen and multi-task operation at the same time, free switching, and the work efficiency will naturally be greatly improved. Such curved surface features are more beneficial to fashion media experts, professional graphics, video production and processing people, or business people who need to achieve multiple tasks at the same time.

With the strong foundation of R1800 curvature, upstart LCDs like HKC C4000, on the basis of excellent surround and wrapping visual effects, C4000 uses VA panels commonly used in Samsung's high-end products to ensure excellent 178° ultra-wide viewing angle, as well as the color reproduction, sharpness and layering that high-end players love, with the ultra-high static contrast ratio of 3000:1, it can control the high-definition video playback and the rendering of large-scale complex games. The effect is also enough. satisfaction.

The relevant comparative analysis of the curvature of 1500r and 1800r is introduced here. If there are any deficiencies, please correct me.

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