LG Display at IMID 2026

IMID, the International Meeting on Information Display, is the Korean Information Display Society’s annual gathering, and the twenty sixth edition ran at BEXCO in Busan. LG Display organised its stand around a single architectural idea and then showed it everywhere that idea can be used. The idea is tandem, and it is a materials decision before it is a product decision.

Introduction: a booth organised around one idea

Most exhibition stands are organised by product category. LG Display’s was organised by argument. The wall said it plainly: Tandem Vision, LG Display’s tandem solutions for various applications. Television, tablet, laptop, monitor, gaming, mobility. Different sizes, different customers, one stack architecture underneath all of them.

That is unusual, and it is worth taking seriously, because it means the company is betting that a structural answer beats a chemical one for the next few years. Where a competitor might chase a better blue emitter, LG is buying the same headroom by changing how many emitting units sit between the electrodes.

The Tandem Vision wall: LG Display’s tandem solutions, shown across every product category on the stand.

Tandem: two emitting units, and why lifetime rises faster than cost

A tandem stack places two or more complete emitting units in series between the anode and cathode, joined by charge generation layers. A charge generation layer is an internal junction that produces an electron and a hole and sends one into each neighbouring unit, so a single electron passing through the device can generate a photon in every unit it crosses.

The consequence is the interesting part. To reach a given brightness, each unit now carries roughly half the current density it would carry alone. Degradation in an OLED is strongly super linear in current density, so halving the stress on each unit buys back far more lifetime than the extra deposition steps cost. You pay a little in drive voltage, because the units are in series, and you pay in process complexity. You get brightness headroom and lifetime that a single stack cannot reach.

The materials burden sits in the charge generation layer. It has to generate carriers efficiently, be optically transparent so the light from the lower unit passes through, remain electrically stable over years, and align its energy levels precisely with both adjacent units. It is one of the least visible and most demanding parts of a modern OLED stack.

A tandem WOLED television panel on the stand.

Tandem everywhere: TV, tablet, laptop

The consequence was visible across the whole floor. A tandem OLED television. A thirteen inch tandem tablet panel. A sixteen inch tandem laptop panel with advanced thin film optics, carrying a claim of two point three additional hours of battery life against a single stack OLED.

That last number is the one to look at, because it is not a brightness claim at all. It is an efficiency claim. If the same luminance is reached at lower current density, the panel draws less power for the same picture, and on a laptop that surfaces directly as runtime. A structural decision taken for lifetime reasons shows up on the specification sheet as battery hours.

The 16 inch tandem laptop panel, claiming 2.3 additional hours of battery lifespan against single stack OLED.

Gaming: 720 Hz is a response time argument

The e-sports corner is where refresh rate becomes physical. A twenty seven inch panel billed as the world’s first seven hundred and twenty hertz gaming OLED. A thirty nine inch five K by two K ultrawide. Adaptive and high speed gaming modes across the wall.

At seven hundred and twenty hertz a new frame arrives every one point three nine milliseconds. No liquid crystal can reorient in that window, which is why this specification belongs to OLED and not to LCD. In an OLED the switching time is the time it takes injected charge to recombine and the excited state to decay, and that is measured in microseconds rather than milliseconds. The panel is not the bottleneck; the carrier mobility of the transport layers and the exciton lifetime of the emitter are what set the floor.

There is a second consequence that only shows on a specification sheet. Driving a panel at that rate means each frame is displayed for a very short time, so peak luminance during the on period has to be high to reach an acceptable average. That is another argument for tandem.

The gaming zone: the world’s first 720Hz gaming OLED, alongside creator and entertainment panels.

Display at work: 5K at 220 PPI and the true RGB stripe

For professional work the argument was resolution and text rendering. A five K monitor at two hundred and twenty pixels per inch, and a twenty seven inch panel with a true RGB stripe at one hundred and sixty pixels per inch.

A real stripe matters more than the number suggests. In a shared or diamond sub pixel layout the renderer borrows sub pixels from neighbouring pixels to draw a thin feature, which is invisible in photographs and obvious in small text and fine line work. A true RGB stripe removes that compromise. Achieving one at high density is a deposition and patterning problem: the fine metal mask has to resolve three separate sub pixels per pixel at that pitch, without shadowing, across a large substrate.

The Ultra-High Resolution exhibit: 5K at 220 PPI for professional content creators.

Brightness and colour: BT.2020 and the nit ladder

Two numbers were doing quiet work across the stand. Colour gamut at or above ninety percent of BT.2020, and a brightness ladder that keeps climbing well past one thousand two hundred nits.

Both come from the same place. Wider gamut comes from narrower emission spectra, because the primaries a display can produce are bounded by the width of its emission peaks; a narrow peak sits closer to the spectral locus on the CIE 1931 diagram and encloses more area. Higher brightness comes from more efficient use of the current, which is tandem again, and from outcoupling improvements that let more of the generated light escape the stack instead of being trapped in waveguide modes.

Mobility: where the qualification is hardest

The automotive wall closed the argument. Rear seat and cabin displays, consoles and armrests that wake as displays, and a claim of reliable visibility for any journey.

Automotive is the hardest environment organic materials face. A cabin cycles from well below freezing to well above ambient, sits in direct sunlight, and is expected to work for a decade or more. Under those conditions the winning material is not the one with the best efficiency on a fresh device. It is the one with the higher glass transition temperature, the cleaner degradation pathway, and the tighter purity specification. Tandem helps here too, for the same reason it helps everywhere: less current through each unit means less stress per unit, and stress is what kills panels in a car.

The mobility display wall: reliable visibility for any journey.

Four generations of OLED emitters: the chemistry behind the specs

Everything above sits on a chemistry timeline that is nearly forty years long.

First generation: fluorescence, 1987

Tang and VanSlyke demonstrated the first practical thin film OLED. Fluorescent emitters use only singlet excitons, and since recombination produces singlets and triplets in a fixed one to three ratio, internal quantum efficiency caps near twenty five percent.

Second generation: phosphorescence, 1998

Baldo, Thompson and Forrest showed that heavy metal complexes, iridium in particular, allow triplets to emit. Internal quantum efficiency approaches one hundred percent. Commercial red and green descend from this work; blue remains the open problem because the energy required shortens lifetime.

Third generation: TADF, 2012

Adachi and colleagues demonstrated thermally activated delayed fluorescence: a very small singlet to triplet gap lets ambient thermal energy return triplets to the emitting singlet, harvesting all excitons without any precious metal.

Fourth generation: MR-TADF, 2016

Hatakeyama and colleagues introduced multi resonance TADF, rigid boron and nitrogen frameworks whose emission is both efficient and very narrow, twenty to thirty nanometres FWHM. This is the generation that closes the colour purity gap with quantum dots using a purely organic emitter.

The takeaway

The display roadmap is written in materials. Brightness came from stacking emitting units. Efficiency came from harvesting excitons and from backplanes that know when to rest. Colour purity is coming from narrowband emission. Automotive durability is being won by molecular stability and purity. LG Display’s IMID 2026 booth showed all four levers pulled at once, and each lever, followed to its source, ends at a molecule.

Glossary for the general reader

OLED. Organic light emitting diode. A display pixel made of thin organic semiconductor films that emit light directly when current flows, with no backlight.

IQE and EQE. Internal and external quantum efficiency. IQE counts photons generated per injected electron inside the device; EQE counts photons that actually escape into the air, typically 20 to 30 percent of IQE without special outcoupling.

Singlet and triplet excitons. The two spin states formed when electrons and holes meet, in a fixed 25 to 75 ratio. Which of them a molecule can use for light defines its emitter generation.

FWHM. Full width at half maximum, the width of an emission peak. Narrower emission means purer colour; 20 to 30 nm is the current gold standard for both quantum dots and MR-TADF emitters.

CIE 1931 and BT.2020. The standard map of human colour perception, and the widest broadcast colour gamut defined on it. Covering more of BT.2020 requires primaries with narrow FWHM.

Tandem stack and charge generation layer. An architecture that stacks two or more emitting units in series, joined by charge generation layers that supply electrons and holes to each unit, trading a little voltage for large gains in brightness and lifetime.

LTPO. A backplane combining polysilicon drive transistors with oxide switching transistors, letting a panel drop its refresh rate on static content to save power.

Nit. One candela per square metre, the standard unit of display brightness. A phone peaks near 1,000 to 2,000 nits.

MR-TADF and hyperfluorescence. Multi resonance TADF emitters are rigid boron nitrogen molecules with very narrow emission; hyperfluorescence pairs them with a TADF sensitiser that harvests all excitons for them.

Sublimation purification. Purifying a material by evaporating and recondensing it under vacuum, the standard route to the parts per billion purity levels that long lived OLED devices require.

Sourcing the materials behind this story

LUMORA, research to pilot quantities. LUMORA, a brand of LAMKO Co., Ltd., supplies high purity sublimed OLED, OPV and semiconductor materials, including emitters, hosts and charge transport materials, for research and development use. Every lot ships with a certificate of analysis. Browse the catalogue at lumorachemicals.com or write to sales@lumorachemicals.com.

LAMKO, scale up and CRDMO. For kilogram to production scale supply, custom synthesis of new emitters, and full CRDMO support from first gram to production volume, work with LAMKO. Projects proceed NDA first and your intellectual property stays yours. Start by describing your project to LUMI, our AI project workspace, at lamko.co.kr/lumi, or visit lamko.co.kr.

The LAMKO Co., Ltd. and LUMORA stand at IMID 2026.

References and sources

C. W. Tang, S. A. VanSlyke, Applied Physics Letters 51, 913 (1987). M. A. Baldo, M. E. Thompson, S. R. Forrest et al., Nature 395, 151 (1998). H. Uoyama, C. Adachi et al., Nature 492, 234 (2012). T. Hatakeyama et al., Advanced Materials 28, 2777 (2016). Product and exhibit information: LG Display newsroom and press coverage of IMID 2026. All photographs in this document were taken by LUMORA at IMID 2026, BEXCO, Busan.

Disclaimer: this document is educational commentary based on our own visit to IMID 2026 and on publicly available information. All product names, brands and trademarks belong to their respective owners. No affiliation or endorsement is implied. Specifications quoted are as presented by the exhibitors and may change.