Low-power LED display system design

Aug 24,2021| LED Knowledge

LED display, due to its large area and long playing time, its power consumption is a key indicator that customers pay attention to. Reducing the energy consumption of the display is an important development direction of LED display technology.

Energy-saving management of LED display control system:

LED display screen is a system integration engineering application that integrates various modern engineering technologies such as computer technology, electronic technology, optical technology, electrical technology and structural technology. The basic composition of the LED display system is shown in Figure 1, including: computer and system management interface, LED AC power distribution cabinet, signal front-end processor, display end signal distributor, LED display (LED module array), etc.

LED display control system

Energy-saving management of the host computer of the LED display system:

Usually the upper computer of the LED display screen includes computer hardware and upper computer software. In the LED display system, it is not only the media editing platform of the display system, which provides the image and video signal source for the display; it is also the control platform and control system of the display system. Hardware and software equipment.

From the perspective of energy saving, the host computer appropriately regulates the various equipment of the system to achieve the energy saving purpose of the LED display system:

(1) According to the actual feedback electrical load requirements, balance the three-phase AC power supply of the power distribution cabinet;

(2) According to actual needs, close some useless areas of the screen;

(3) Control emerging energy supply (such as solar and wind energy, etc.) to improve the conversion efficiency of electric energy;

(4) Realize time program management of LED display brightness;

(5) Realize environmental brightness program control LED display, etc.

LED display control system

Energy-saving management of signal front-end processor:

The signal front-end processor receives the control commands and video image data input from the host computer, and then reorganizes and arranges these two data signals through the FPGA, and then sends them to the signal distributor through the optical fiber: it also receives the data signal fed back by the optical fiber, and The analysis of the data is completed through FPGA and forwarded to the upper computer for processing through the MCU. In the LED system without the upper computer participating in the work, the embedded platform of the signal front-end processor will assume the intelligent control function of the entire system and the equipment.

The function of the signal distributor on the LED display screen:

The signal distributor on the LED display screen receives the data signal from the optical fiber. First, the video data and the command data signal are divided into 4 groups of signals according to the actual project arrangement of the display module array, and then the video data and the command data are separated through the LVDs interface. Four input ports sent to the LED display body. On the other hand, the command feedback data signal or detection data from the s creen enter the processor PPGA through the 485 interface, and then send it to the signal front-end processor through the fiber modulator. It is a signal transmission hub. The grouping and arrangement of various data and the massive processing work of downloading and uploading are handled here.

Module energy-saving design:

LED modules include: module signal control module, LED dot matrix module, module power supply module, etc.

Energy-saving design of module signal control module:

The data signal transmitted by the module signal control module distributor is converted by the LVDS interface chip and the data stream is divided into two channels, one of which is looped and output by the LVDS signal to the input of the next module, and the other is input in the way of TTL level To PPGA; FPGA then analyzes the command data and video data according to the module ID number; the video data intercepts the corresponding regional video data according to the address, buffers it, and outputs it in a certain algorithm format to drive the LED dot matrix module; the command data, then Execute corresponding commands, such as GAMMA correction, brightness adjustment, switch of module power supply, etc. at the same time. According to the relevant command requirements, the module responds to the return signal and the detection data of the relevant sensor is transmitted upwards through the upload channel.

Module signal control module, display terminal distributor, front-end signal processor and host computer (including control interface software) constitute a closed-loop control process;

Realize the functions of environmental brightness program control, time brightness program control, power module adjustment, and real-time adjustment of LED display load, which provides the necessary software and hardware conditions for signal processing for energy-saving applications of the display.
LED display control system

Module power supply power topology energy-saving design:

The module power supply mode of the LED display screen generally adopts a bus power supply mode in which low-voltage and high-current switching power supply modules are output in parallel. Due to the large output current of the switching power supply and the large copper loss of the transformer, the overall power conversion efficiency is low (the full load can only be within 75%). This article recommends that the power supply in the module adopts a number of small-scale switching power supply distributed power supply methods to improve the energy conversion efficiency of the switching power supply.

For example, the efficiency of a switching power supply module with AC 220v bus input, 35W maximum input power and adjustable output voltage can reach 86% or more. The energy conversion efficiency of the switching power supply is more than 10% energy-saving compared to the conventional power supply topology structure of large current parallel power supply.

Three effective low-power design measures are proposed around the power consumption of LED displays:

1. According to the actual engineering application, optimize the management of the equipment of the LED display system, which is an important means of energy saving for the LED display;

2. Selecting high-efficiency LED devices and designing high-efficiency LED device drive circuits are one of the main ways to save energy in LED displays;

3. Adopt distributed power supply and improve the energy conversion efficiency of switching power supply, which is also one of the main ways to save energy for display screens.

Therefore, the design of low-power LED display systems will surely promote the continuous development of product upgrades and technological innovations in the entire LED display industry.

  Article KeyWords:Low-power LED display system design


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