Micro-Lens Array (MLA)

China-based Tianma is showing many OLED displays and prototypes at SID Displayweek 2025. First up are two13" concave displays (C-shaped and L-shaped), aimed for automotive dashboards. The company says that these distinctive contours not only deliver a striking visual experience but also helps enhance driver focus. Both displays are based on Tianma's tandem OLED architecture, which the company calls SLOD (Stacked Layer OLED Device, more on this below).

The second display is a 6.67" AMOLED that integrates a microLens array (MLA, which Tianma refers to as MLP or Micro Lens Pattern). Tianma says they adopt an innovative optical design to significantly boost the front-view light extraction efficiency. Tianma also shows a 6.78" tandem (SLOD) smartphone AMOLED display, to increase power efficiency. Tianma says that unlike traditional tandem OLEDs, its SLOD technology adopts a CGL structure with an extremely low device voltage using a differentiated light-emitting unit - thus achieving higher power efficiency. Tianma reports that the power consumption is reduced by 30% compared to a single-layer device, while brightness is increased by 25% and lifetime is up to four times higher.

According to reports from Korea, Microsoft has signed an agreement with Samsung Display for the supply of OLED microdisplays for a future MX device, that Microsoft plans to launch in the future (likely 2026 or later).

Microsoft agreed to order a few hundreds of thousands of units of Samsung's OLED microdisplays. Samsung Display is collaborating with Samsung System LSI, that will design the CMOS backplane, which will be produced by Samsung Foundry. Samsung Display will handle the frontplane OLED deposition and encapsulation.

OLED displays have been gaining popularity rapidly, and are already the dominant smartphone display technology. OLEDs are also the display technology of choice in the smartwatch market, making inroads into the TV, monitor, laptop and tablet markets. The future of the OLED industry looks bright.

In recent years, the focus of the industry, beyond increasing capacity and reducing production costs, has been improving the performance of OLEDs in the areas of display brightness, efficiency, and lifetime. Brightness is required in many applications - from TVs (for HDR and to view in ambient lighting) through smartphones (outdoor viewing) to automotive, and efficiency is a plus in any scenario (but mostly in mobile displays). Display lifetime is already good enough for many applications, but in some cases (like automotive, and IT displays) it is critical. These three properties usually go together - if you can make more efficient OLED displays, you can drive them at a lower current to achieve the same brightness, and so lifetime increases, or you can achieve higher brightness, etc. 

Since Samsung started mass producing AMOLED displays in 2007, most people believe that the company is not only the leader in OLED production capacity, but also in the performance of its displays. In most cases, Samsung has been the first company to develop and manage to mass produce the most advanced OLED displays, and the first to adopt the latest OLED materials, architectures, and processes.

There are some signs that this could be changing, although honestly it's a bit too early to know. In May 2024, Apple launched its first OLED Tablets, and according to reports, Apple chose LG Display as its main supplier, ordering around 60% of its iPad OLEDs from LGD (with all of the 13" model orders going to LG), and the rest from Samsung. Later it was reported that Apple had to delay the introduction of its 2024 iPad Pro devices as Samsung faced low production yields and could not deliver displays in time.

LG Display demonstrated its latest OLED display prototypes and commercial panels at Displayweek 2024. The company showed flexible panels, automotive displays, transparent OLED, gaming monitors, a 10k nit microdisplay and more.

So first up, LG Display shows its automotive Advanced-Thin-OLED (ATO) displays, which are produced on glass substrates and use a tandem structure. These OLEDs are lower in cost compared to LGD's flexible automotive p-OLED panels, but still enable low-weight and thin profile, and the excellent image quality of an OLED display. The smaller display was a 12.3" 2400x900 (209 PPI) 1,000 nits panel, while the other panel was larger at 17" 1920x2560 (188 PPI).

LG Display developed a new OLED microdisplay (OLEDoS) that achieves a brightness of 10,000 nits. This development is presented at SID DisplayWeek 2024. 

To achieve this high brightness, LG Display's research team used newly-developed high performance OLED materials, and also used a micro lens array (MLA) to expand the light output from the device. 

LG Display announced that it has developed its 2nd generation Multi-Lens Array (MLA) technology, branded as META Technology 2.0.  The company demonstrated a 83" META 2.0 OLED TV panel, during CES 2023. The company will apply this technology to several of its 2024 OLED TVs, ranging in size from 55-inch to 88". 

META 2.0 WOLED panels achieve a peak brightness of 3,000 nits - a 42% improvement over the company's conventional panels. LGD explains that META 2.0 includes a pattern of optimized micrometer-scale lenses with an optimized lens angle, an upgraded "brightness enhancing algorithm" called META Multi Booster, and a full-range brightness detail enhancing algorithm called Detail Enhancer. All of these new technologies, combined, makes for a META 2.0 panel. In a 77-inch 4K panel, there are 42.4 billion micro lenses (!).

US-based Pixelligent is an advanced materials company that delivers next generation optical materials applications in lighting and displays. For the OLED industry, Pixelligent offers materials that significantly increase light output by increasing the refractive index of materials in the device.

Pixelligent's President and CEO, Craig Bandes, was kind enough to answe a few questions we had, to learn more about Pixelligent and its solutions for the OLED industry.

Hello Craig! Can you explain your technology and materials and how they enhance the efficiency of OLED display?

We are best known for our high refractive index (HRI) nanocrystal formulations and dispersions that deliver breakthrough performance in next-generation electronics, like extended reality, displays, optics, and sensors. We designed our PixJet®, PixNIL®, and PixClear® products to offer the best combination of brightness, clarity, operating efficiencies, and device-lifetime. 

LG Display announced that it has successfully developed a 27-inch 480Hz QHD (2560x1440) Gaming OLED display, a world first. The panel offers a 0.03 ms response time, that together with the ultra-fast refresh rate, makes it optimal for gaming. LGD's new panel also implements the company's Micro-Lens Array (MLA) technology to enhance light output. 

LGD says that it will start producing this new panel in the first half of 2024. The company's 2024 gaming OLED monitor lineup will include panels in sizes 27, 31.5, 34, 39, and 45 inches.