07/07/2022

The COB Technology Brings Better Visuals to ViewSonic’s Latest All-in-One LED Displays

(July 7, 2022) – ViewSonic launches its first 4K UHD All-in-One Direct View LED Display Series boasting the Chip on Board (COB) LED packaging with flip chip. It offers the LED display an outstanding visual performance with 4K resolution, 20000:1 ultra-high contrast ratio, and a wider viewing angle of 170 degrees as well as enhanced reliability.

In a bid to improve high-definition displays, manufacturers continuously pursue ways to decrease the pixel pitch as much as possible. Pixel pitch is important because it influences the resolution. The finer the pixel pitch, the more pixels can fit into the same physical size, hence, increasing the pixel density and resolution. One of the most common ways to decrease pixel pitch is the way the LED is packaged on a board.

There have been numerous LED packaging methods over the years, including Dual In-line Package (DIP), Surface Mounted Device (SMD), Chip on Board (COB), and Integrated Matrix Device (IMD).

Among all, SMD is the most common method for LED displays. However, with production gradually moving more to the era of the Mini-LED and Micro-LED, COB’s ability to produce a much smaller pixel pitch makes it a more suitable candidate for these types of productions.

 

The COB LED Packaging Technology

Compared to the SMD LEDs, the COB LEDs are multiple flip chips attached directly to a base to form a single module with no bonding wires. This mounts chips in a manner that takes up less space, thus increasing the resolution.

Figure 1 – COB LED with no extra layer and bonding wires required

Figure 1 – COB LED with no extra layer and bonding wires required

As the LED chips directly connect to the base, it also allows for better display effect with enhanced contrast and a wider viewing angle. Moreover, the freeing of an extra layer simplifies the production process and further provides greater thermal conductivity as well.

Additionally, because multiple LED chips are packed together and mounted onto the substrate, the COB LEDs have better resistency to water, dusts, and collisions.

  

Figure 2 – Flip-Chip technology allows wider viewing angle

Figure 2 – Flip-Chip technology allows wider viewing angle

In conclusion, with an improved construction process and fewer parts to connect, COB LEDs bring several benefits to the LED display:

  1. Better visual effect – higher resolution, higher contrast ratio, and wider viewing angle
  2. Better reliability – enhanced anti-collision, dust-proof, and moisture-proof abilities.

 

ViewSonic 4K UHD All-in-One Direct View LED Display Series with COB Technology

  1. LDP135-071
  2. LDP163-091
  3. LDP216-121