COB-Major Trend for Future LED Display

As the micro-pitch market continues to heat up, 4K and 8K high-definition has gradually become the new standard for LED displays, and the market demand for high-definition displays is increasing.COB, who can gain market recognition on the road of micro-pitch display? These packaging technologies have their own merits, but the era of micro-pitch has come. As the vanguard of the micro-spacing era, COB has been widely recognized by the market. With the significant growth of the P0.9 LED Display market this year, COB has become the protagonist of indoor high definition LED display. In the foreseeable future, as the spacing becomes smaller Going down, COB will be the main product iteration direction of the market.

With the continuous advancement of COB technology, this year’s micro-pitch LED display, common cathode, flip-chip, mass transfer and other terms have become the focus of the news many times, what are these technologies? How does it determine the future of COB technology micro-pitch towards?

Common cathode technology – energy saving, high density and low power consumption

The conventional LED display adopts the common anode (positive pole) power supply mode, the current flows from the PCB board to the lamp beads, and the common anode lamp beads and the corresponding driver IC and RGB lamp beads are used for unified power supply. Common cathode refers to the common cathode (negative pole) power supply method, using common cathode lamp beads and a special common cathode driver IC scheme, R and GB are separately powered, and the current passes through the lamp beads and then goes to the IC cathode. After using the common cathode, we can directly supply different voltages according to the different requirements of the diode for the voltage, so there is no need to configure a voltage divider resistor to reduce the energy consumption of this part, but the display brightness and display effect are not affected, and the energy saving is increased by 25%~ 40%.

common anode LED lamp

What is the difference between the drive architecture of common cathode and common anode?

First of all, the driving method is different. Common cathode driving means that the current first passes through the lamp bead and then goes to the negative electrode of the IC, so that the forward voltage drop becomes smaller and the on-resistance becomes smaller. The common anode drive is that the current flows from the PCB board to the lamp bead, which supplies power to the chip uniformly, and the forward voltage drop of the circuit becomes larger.

Secondly, the power supply voltage is different, the common cathode drive, the voltage of the red chip is about 2.8V, and the voltage of the blue and green chips is about 3.8V. This kind of power supply can achieve accurate power supply and less power consumption, and the heat generated by the LED display during work. Also relatively low. Common anode drive, under the condition of constant current, the higher the voltage, the higher the power, and the greater the power consumption ratio. At the same time, the red chip needs a lower voltage than the blue and green chips, so it is necessary to increase the resistance divider Under pressure, the led display will also bring more heat during work.

SRYLED technology – an advanced stone for the development of micro-pitch LED display

The advantages of COB technology itself have become the focus of the market, and SRYLED COB has raised COB technology to a new height. COB itself is a multi-lamp integrated bracket-free packaging technology that directly encapsulates the light-emitting chip on the PCB board. The tedious surface mount process is omitted, and there is no soldering foot of the bracket. The LED chip and soldering wire of each pixel are tightly and tightly encapsulated in the colloid by epoxy resin, without any exposed elements. For protection, it can solve the problem of damage to pixels caused by external factors. SRYLED COB can greatly increase the current density, improve the stability and light efficiency of lamp beads, and the SRYL structure can well meet such needs. , High reliability, and the advantages of non-dazzling surface light sources to further improve reliability, simplify production processes, and achieve better display effects, which can achieve chip-level spacing and reach the level of Micro LED.

What advantages does COB bring?

COB crosses the limitations of packaging technology and makes the pitch smaller. We have launched products with a pitch of 0.6mm to meet the needs of high-definition 8K LED display. Nowadays, it is mainly used in various command centers, data centers, studio centers, conference centers, commercial centers, home theaters, etc. In the future, with the advancement of new-generation technologies such as 5G, the Internet of Things and artificial intelligence, as well as the accelerated pace of national informatization construction and urban informatization transformation, the commercial display market space will continue to develop. , entertainment media and security fields, the market prospects are very bright. In the future, display products will continue to develop towards smaller pitches.

Post time: Mar-07-2022

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