COB LED micro-display technology—your professional choice for large-screen TVs!

Recently, at the 2019 China Household Electrical Appliances & Consumer Electronics Expo (AWE2019) held in Shanghai, Samsung unveiled its Q900 series Q in China. LED 8K televisions, including a 98-inch model priced at 999,999.00 yuan—nearly one million yuan—drew the attention of numerous visitors. This 98-inch 8K Q… LED Television , is currently the largest size that can be mass-produced for conventional LCD TVs.

Samsung launches the Q900 series QLED TVs.

With the growing popularity of 4K TVs, 8K televisions are also making their way into the market. Both 4K and 8K sets demand higher resolutions, driving the need for larger, ultra‑high‑definition panels. Today’s large‑screen display technologies primarily include LCD, laser projection, SMD LED small‑pitch displays, and COB LED micro‑pitch displays. So, when it comes to screens 100 inches and above, why do professionals consistently favor COB LED micro‑display technology over other options? Below, we’ll analyze the characteristics of each approach.

First, let’s take a look at liquid crystal display technology.

When liquid crystal display technology is applied to screens larger than 100 inches, the low yield of producing such large‑size panels drives up costs, keeping prices stubbornly high. Samsung’s 98‑inch QLED TV, priced at nearly one million yuan, is indeed very expensive.

Liquid crystal display technology—another challenge with TVs 100 inches and larger is the difficulty of transportation and in-home installation. The table below shows the width and height dimensions of TVs ranging from 100 to 150 inches.

100 TV dimensions (length and width) for screens larger than one inch

As shown in the table, when the TV size exceeds 100 inches, the overall dimensions—excluding packaging—exceed 2 meters in length and 1 meter in width, posing significant challenges during transportation. Moreover, delivering the TV into the home via elevator is extremely difficult.

Next, let’s take a look at laser projection technology.

Laser‑projection television is a large‑screen display technology that has emerged in recent years, and it is a passive‑emission display. By projecting images from a laser short‑throw projector onto an ambient‑light‑rejecting screen, it can deliver a display of 100 inches or larger. However, laser‑projection TV suffers from three inherent limitations that prevent it from matching the performance of other display technologies. First, compared with other display methods, ambient‑light‑rejecting screens exhibit very low contrast. Second, the screen’s color gamut is significantly reduced after reflection. Third, the brightness of projected images remains relatively low.

Schematic diagram of the serrated microstructure of an anti-glare screen.

The schematic diagram of the laser‑projection anti‑light screen is shown in the figure. The screen’s microstructure consists of a serrated optical pattern: above the serrations lies an absorptive layer coated with black material, while below are white reflective layers coated with a specialized material. The black layer absorbs ambient light, enhancing contrast, and the white reflective layer reflects the projected image. As revealed by the screen’s microstructure, the surface cannot achieve complete blackness; a significant portion remains white, resulting in limited contrast and preventing high‑quality image reproduction.

In addition to its relatively low contrast, an ambient‑light‑resistant screen also has a limited color gamut, resulting in significant color loss. Because the screen relies on passive reflection, even with technological advances that expand a projector’s color gamut, the screen itself—being a passive‑reflection display—still incurs substantial color degradation, leaving the projected image with a reduced color gamut.

The low brightness of laser‑projection TVs is one of the primary reasons for their subpar picture quality. Because laser‑projection TVs rely on a passive reflective display mechanism, even though the projector’s rated brightness may be quite high, the image brightness after being reflected off an ambient‑light‑rejecting screen remains very low, resulting in washed‑out images and significant loss of sharpness. This whitening effect becomes especially pronounced in the presence of ambient light. Consequently, the overall visual performance struggles to meet consumers’ basic expectations for large‑screen, high‑quality displays.

Now let’s take a look at the third SMD LED small-pitch display technology.

SMD LED small-pitch display technology is used in televisions larger than 100 inches, but it faces two insurmountable technical hurdles that make it difficult to become the standard for such large‑size TVs. One of these technical barriers is… LED LED bead Poor impact resistance and low pixel reliability. LED small-pitch displays manufactured with SMD 1010 components exhibit an impact force that is one order of magnitude lower than that of COB‑based displays, resulting in reduced reliability—particularly at sub‑P1.0 pitches, where reliability is so poor that mass production is essentially unfeasible.

SMD Comparison of Anti-Collision Thrust Between Small-Pitch and COB Micro-Pitch Displays

Another technical hurdle for SMD small-pitch display technology is its inability to meet the required levels of image clarity. As the demands for 4K and 8K displays continue to rise, the need for higher resolution becomes increasingly stringent. However, SMD small-pitch technology can only produce displays with a pixel pitch of P1.0 or greater, making mass production at pitches below P1.0 unfeasible.

SMD Comparison of the achievable pixel pitch ranges between small-pitch displays and COB micro-pitch displays.

Finally, let’s take a look at COB micro-pitch LED display technology.

COB LED micro-display technology is known as Micro LED display technology overseas. In 2018, Samsung launched a 146-inch Micro LED TV—the Wall. This was the first product unveiled by global display giant Samsung in the LED video wall market.

COB LED micro‑display TVs larger than 100 inches, unlike LCD TVs, leverage splicing technology, thereby avoiding the logistical challenges associated with transporting and installing screens over 100 inches. Compared with laser‑projection technology, COB LED micro‑display technology not only delivers higher brightness but also boasts a decisive edge in display quality. The figure below shows the color gamut of COB display technology.

COB LED Measured color gamut of microdisplays

As shown in the figure, the color gamut of COB LED micro-display technology is significantly broader than that of the DCI‑P3 and ITU‑R BT.709 standards currently used in the film and television industry, resulting in superior color reproduction.

Compared with SMD LED small-pitch display technology, COB LED micro-display technology offers significantly higher pixel reliability: at the user end, its pixel failure rate is below 10 PPM, one to two orders of magnitude lower than that of SMD small-pitch displays. Moreover, in terms of achieving even smaller pixel pitches, COB micro‑pitch display technology can realize pitches of P0.5 and finer, delivering sharper image quality. Consequently, COB LED micro‑display technology boasts clear technical advantages over SMD small‑pitch technology.

As demonstrated by the foregoing analysis, COB LED micro‑display technology is indeed the optimal solution for large‑screen TVs 100 inches and above, making it the preferred choice among professionals for such displays.

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