Generally, conventional LED display screens are commonly used, while arc screens are used less. For arc screens, the arc length, chord length, chord height, etc. can be calculated before the steel structure and the area of the arc screen can be calculated. The editor of the display manufacturer introduces you the calculation method of the curved screen in detail.
1. Measure the chord length, chord height and arc length
Generally, the arc length dimension is difficult to measure and the dimension difference is large, so the arc length and radius are calculated according to the chord height and chord length for verification. The difference can be within 10cm. If the difference is large, please repeat the measurement and calculation.
2. Measuring method of chord height and chord length
The straight line distance between the two end points of the arc is the chord length, and the midpoint of the chord length to the midpoint of the arc line is the chord height (or: the distance between the midpoint of the chord length and the vertical chord length drawing line to the arc is the chord height) The chord length, chord height and arc length of the arc screen 3. Calculate the arc length and radius according to the chord height and chord length
Curved LED display
Calculation idea: The root formula calculates the angle of the chord height and chord length to form a right triangle. example:
①Set the chord height to b and the chord length to 2a. Measure 2a=200 b=60 to calculate the arc length and radius
②The chord height and chord length form a triangle, and the side length is a=100 b=60 chord height and chord length calculation method
③ The chord height and chord length form a triangle. The side length is a=100 b=60. The side length of c is calculated according to the Pythagorean theorem.
④According to the trigonometric formula sin∠A=a/c (∠A is the diagonal of a), that is: sin∠A=0.86 and then use the calculator's arc sine function to calculate ∠A=59.32 degree chord length and chord height angle calculation method
⑤Extend side b to the center of the circle, ∠connect the vertex of B to the center of the circle. That is, an isosceles triangle is formed. According to the inner angle of the triangle and 180 degree , the isosceles triangle ∠C=62 degree is calculated, and then the arc screen radian is 124 degree radian calculation method
⑥According to the formula of sin∠C{{0}}c/hypotenuse, sin62=100/hypotenuse, and then use the calculator to calculate sin62 as 0.883, that is, the hypotenuse length is 113.3 R=113.3.
⑦The circumference of the arc is:
Circumference=2πR=23.14113.3 =711.52Circumference/360
The value of each angle of this circle is: 1.98 arc length = 1.98 per degree billboard radian 124 degree =245.52.
Curved LED display
is finally obtained as arc length: 245.52 radian: 124 degree radius: 113.3 arc screen calculation method
3. Compare the calculated arc length with the actual measured arc length
The difference can be within 250px. If the difference is large, please repeat the measurement and calculation
