Centralized DC power solutions for mini/micro LED display

The LED screen is mainly used for advertising and outdoor entertainment (outdoor concerts) and these screens have a low value of distance between the centers of each pixel (fine pixel pitch).

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With the development of LED miniaturization, Mini and Micro LEDs have appeared on the market, which can be used for indoor LED screens and thus meet the requirements for applications that need high resolution with lower pixel pitch values.

Therefore, for larger indoor LED displays (>100 inches), such as movie theaters, convention centers, and virtual scenes for movie shooting, these low pixel pitch LED displays are suitable.

However, the use of LED screens in indoor applications must meet certain requirements such as minimal noise, low radiant heat, and safe use of electricity and miniaturization.

Generally, the LED display is used outdoors and is equipped with a fan to dissipate system heat or internal power supply heat. When the fan rotates, it will be accompanied by the noise of the high-speed fan, but it will not shock the viewer because it is used outdoors.

If the LED display is used indoors, it will interfere with the listening quality of audiovisual playback and cause radiant heat problems. Also, the color of the LED display changes through different LED wavelengths. So you will feel the radiant heat from the LED when you look at it up close; So, how to reduce the heat of LED and the conversion loss of the internal control board are the premises to be overcome.

In addition, indoor screens are easily touched by users (children), and the way to reduce the risk of electric shock is also an essential safety requirement. Therefore, we recommend adopting a centralized front DC power supply system that is compliant with Safety Voltage (SELV).

Centralized DC power system (front-end) integrates with low-voltage DC/DC power module (back-end) to drive control ICs with 4,2V or 3,8V for improved electrical safety and reduce unnecessary conversion losses and radiant heat from the LED.

In this way, the power supply and control system can be designed to separate heat and electricity, and the heat source can be dispersed to reduce the irradiation problem on the LED display. Generally, the interior space is relatively limited. The use of low-voltage centralized power supply can also reduce the structure of the LED display, which is in line with the miniaturization design, so as to reduce the installation space and improve the aesthetics of the mechanism.

MEAN WELL and OLFER Electronics provide low voltage (24V/48V) DC centralized power supply solutions, especially for low pixel pitch indoor LED displays, to help customers solve the above-mentioned problems.

In addition, we can provide centralized low-voltage DC power systems (front-end) such as UHP/DPU/RST and SHP series, which comply with SELV safety voltage, and then combine with Class III module (NID100-4.2V ) and thus solve the requirements of silence, low radiant heat, safe use of electricity and miniaturization.

Especially for front-end power system, MEAN WELL and OLFER Electronics offer a wide variety of single phase or three phase AC power system solutions to meet all the different needs of customers.

For the CC-CC module, MEAN WELL and OLFER Electronics provide two current outputs of 11A and 15A with different LED screens (pixel pitch) offering brightness values &#;&#;of 600-cd/m2. You only need 2 pieces of the NID100 module for the controller control board. For detailed system power solutions and application case introductions, please refer to the table below and the links below.

Type Name Power Refrigeration Power Sharing Dimensions

(Length x WIDTH X HEIGHT)

Guarantee Front-end

Power

1Ø UHP--24V/48V w Driving X 310 x 140 x 60 mm 5 Years 1Ø DPU--24V/48V ~40KW Ventilador V 325 x 107 x 41 mm 3Ø RST--24V/48V 460 x 211 x 83 mm 3Ø SHP-10K-48V 460 x 211 x 83 mm Back-end

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Power

NID100-4.2V/11A 42 ~ 63W free air convection X 50,8 x 27,5 x 13 mm 3 Years NID100-4.2H/15A 50,8 x 27,5 x 19 mm

Features of the 24V/48Vdc centralized power solution:

• Reduce system noise (fan)
• Reduce radiant heat from system and LED
• Comply with Safety Low Voltage (SELV)
• Compact size for system design
• Parallel work function available for front-end power

Case study

For this centralized DC power solution, MEAN WELL cooperates with PBM customer Foshan Chainzone Technology Co., Ltd., which works with low pixel pitch (P1.5) indoor display. Each booth designed with two NID100 DC/DC modules (4.2V/10A) to the controller control board and provides 8K high-definition resolution. It is used in the MEAN WELL Suzhou smart park convention center.

Figure 1. 48Vdc centralized bus (SELV). Indoor mini/micro LED display applications

 

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