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The key to rotating outdoor LED display design
The rotating outdoor LED display is a new type of display that realizes graphic display by synchronously controlling the position and lighting status of light emitting diodes (outdoor LED display). Because of its novel structure, low cost, and a visible range of 360 ° And it has developed rapidly, and its core technology lies in precisely controlling the synchronization of outdoor LED display position and lighting state.
The display device of the rotating outdoor LED display has only one column, and this column of outdoor LED display is driven to rotate by the outdoor LED display with a constant speed. At the same time, the lighting status of the outdoor LED display is controlled synchronously by the control circuit. After a certain angle of rotation, the display content of this column of outdoor LED display changes once, and there is a uniquely determined display content when rotated to any position. That is to say, the rotating outdoor LED display screen is displayed column by column, and Mechanical rotation was used instead of the alternative scan display.
The principle of rotating outdoor LED display is not complicated, and its hardware structure is relatively simple. However, in order for the rotating outdoor LED display to stably display the set image or text, three technical difficulties need to be overcome:
1. Rotary screen controls the power supply of the control circuit. When the system is working, the control circuit rotates with the rotor of the motor, so it is difficult to provide a stable power supply for the rotating control circuit and outdoor LED display.
2. The smear problem is displayed on the rotating screen horizontally. Because the rotating screen uses a single-row outdoor LED display to rotate and scan to achieve a cylindrical image display, this causes the image display to be sticky in the horizontal direction, forming a smear phenomenon.
3. Solve the insufficient display brightness. Due to the working principle of the rotating outdoor LED display electronic screen, 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 effects, these three problems need to be solved in the design. For the power supply of the rotating outdoor LED display, it is a relatively simple and reliable method to supply power to the system by contacting the brush blade fixed on the base with the rotating metal rail or metal wheel shaft. The design of this article is to provide a constant 12V DC voltage through the brush, and then converted to 2.5V, 3.3V, 5V and other voltages by the DC-DC chip to maintain the control system work.
To solve the horizontal smear of the rotating screen, it is mainly based on the characteristics of rotating scanning that a full black time slot is inserted between the two columns of pixels, so that the sticky feeling of the image display points in the two columns can be eliminated. In order to solve the problem of insufficient brightness display, the design of this article uses four columns of outdoor LED display lights to display each pixel on each rotating screen in turn without increasing the brightness of the outdoor LED display lights. Point, so that the brightness will be four times the original without changing the rotation rate.