Rotating outdoor led display screen display a new screen could be implemented synchronous control the graphic display light-emitting diode (led outdoor display) the position and state by the lighting, because of its novel structure, low cost, the visual range of 360 ° has been rapidly developed, its core technology is to accurately control the synchronization of the position of the outdoor led display and the state of illumination. Outdoor rotating l The display device of the ed display has only one column, and the outdoor LED display screen is rotated by the outdoor LED display with constant rotation speed , and the control circuit directly controls the lighting state of the outdoor LED display screen , so that the motor rotates every time. At a certain angle, the display content of this outdoor LED display changes once, and there is a unique display content when rotated to any position. That is to say, the rotating outdoor LED display screen is displayed column by column and uses mechanical Rotate instead of the alternate scan display.
　　 Rotating outdoor led The principle of the display screen is not complicated, and its hardware structure is relatively simple. However, in order to enable the rotating outdoor led display to stably display the set image or text, it is necessary to overcome three technical difficulties:
a. Rotating screen control control circuit power supply. When the system works, the control circuit rotates with the rotor of the motor, so it is difficult to provide a stable power supply to the rotating control circuit and the outdoor led display .
b. The rotating screen displays the smear problem laterally. Since the rotating screen adopts a single-row outdoor LED display rotary scanning to realize the cylindrical image display, the image-like display appears viscous in the lateral direction, forming a smear phenomenon.
c. Solve the lack of display brightness, because the working principle of the rotating outdoor LED display electronic screen determines that compared with the ordinary flat outdoor led display , the time for displaying each column is much less, so the brightness will be greatly reduced.
In order to make the designed rotating outdoor led display have better display effect, it is necessary to solve these three problems in the design. For the power supply of the rotating outdoor led display , it is relatively simple and reliable to supply the system with the brush piece fixed on the base and the rotating metal rail or the metal wheel shaft. The design of this paper is to provide a constant 12V DC voltage through the brush , and then convert the DC-DC chip into 2.5V , 3.3V , 5V and other voltages to maintain the control system. To solve the horizontal smear of the rotating screen, the main purpose is to insert a full black time slot between the two columns of pixels according to the characteristics of the rotating scanning, so that the stickiness of the display points of the two columns of images can be eliminated. For solving the problem of insufficient brightness display, the design of this paper does not continue to increase the brightness of outdoor led display lights, using four columns of outdoor led display lights to display each image on each rotating screen in turn. The prime point, such that the brightness is four times the original when the rotation rate is constant.
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