technology

For years, OLED technology has been the indisputable reference in terms of image quality. Perfect blacks, infinite contrast and the precision of individually dimmable pixels are its hallmarks. However, since their origin, these panels have had a problem inherent to the nature of the materials used in their manufacture: uneven wear of your pixelsor what the industry calls “burn-in” or screen burn-in. This burning leaves a constant mark on the screen of television channel logos, banners and even icons if they were used as monitors. Now, the industry believes it has found the missing piece to solve this OLED problem. It is called PHOLED and its proposal revolves around something very specific: the color blue. The weak point was always the same: the diodes An OLED panel works based on organic light-emitting diodes when current passes through them. Each pixel generates its own color without the need for backlighting, which explains its superior contrast levels and depth in blacks compared to technologies such as LCD or MiniLED because it literally turns off its pixels, something LCD-based technologies cannot do. The problem with OLED is that not all colors age the same. The blue subpixel has greater degradation than red and green because, of the three primary colors, blue has the shortest wavelength and requires the most energy to be emitted stably. To make an analogy, it is as if a blue car needed to go in second gear and 5,000 rpm to reach a speed of 50 km/h, while the green and red car circulate at the same speed, but with third gear engaged and at 2,500 rpm. After a while, the blue car’s engine would suffer greater wear and tear of materials. Pixels of a WOLED matrix This historical limitation has forced develop intermediate solutions like LG’s WOLED panels, designed precisely to overcome this premature degradation by adding a fourth white subpixel that allowed the blue subpixel to “reduce its revolutions.” That uneven wear is the root of the burn. ​What exactly changes with PHOLED PHOLED (Phosphorescent Organic Light-Emitting Diode) stands for “Phosphorescent OLED,” and the key difference is how the light is generated. The current OLED panels (especially high-end ones) already use phosphorescence in the red and green subpixels. However, blue is still fluorescentwhich are less efficient because they only take advantage of 25% of the electrical energy they receive, compared to the nearly 100% efficiency offered by phosphorescence. ​What PHOLED achieves is to extend that phosphorescence to the blue subpixel, something that had not been viable for more than two decades. The reason why it has cost so much is precisely that high energy demand for blue. The molecules involved in the process have to manage much higher energy levels, which until now made them unstable or too expensive to manufacture. produce on an industrial scale. The benefit of achieving this is threefold. Being more efficient, the blue subpixel needs less energy to emit the same intensity of light, therefore the heat it generates is reduced. Less heat means less stress on the organic material, which in turn extends its useful life. If all subpixels age more uniformly and more slowly, the risk of screen marking will be drastically reduced. That is, lower consumption, less heat and more durability for the panel. PHOLED versus the current OLED and MiniLED Compared to conventional OLED, PHOLED introduces measurable improvementsLG Display has confirmed that its implementation with a double-stacked Tandem structure (which combines a blue phosphorescence layer with a blue fluorescence layer to maintain stability) manages to reduce energy consumption by around 15% compared to current panels. At the brightness level, by making better use of the available energy, the panel can reach higher brightness levels without penalizing lifespan. Some estimates speak of screens up to three times brighter than current OLEDs once the technology fully matures. In terms of durability, by matching the efficiency of blue with that of red and green, the panel maintains its performance for longer and more homogeneously, so wear is more progressive and “natural.” Compared to MiniLED, which is still a very precise LCD backlight technology, the leap is of a different nature. MiniLED can reach very high brightness levels, but it can’t turn off individual pixels, so it doesn’t reach the pure black or extreme contrast of OLED. PHOLED maintains these advantages and reduces the main historical weakness of this technology. Why is it not already on the market? He blue phosphorescent diode It has been the great technical challenge of the sector for more than two decades. It wasn’t just about making it work, but making it stable, durable, and scalable to produce high volume displays at reasonable costs. Universal Display Corporation (UDC), the world’s leading supplier of OLED materials, has been operating since 2022. setting marketing deadlines that have repeatedly had to be delayed. The situation changed in May 2025, when LG Display advertisement to be the first company in the world to verify the mass production level performance of phosphorescent blue OLED panels, eight months after starting the collaboration with UDC. Although the achievement achieved with the panels PHOLED is now a realityAt the implementation level, it has not yet been developed as much at the scaling level. That is, it is still very expensive to manufacture. Therefore, its deployment is expected to be progressive. As has already happened with other display technologiessuch as OLED or MiniLED, in all likelihood the first devices to incorporate screens with this technology will be those of reduced sizesuch as mobile phones, tablets and laptops, where production requirements are more manageable. Then monitors will arrive and, finally, televisions, where size and cost requirements are more demanding and the price of the product is more likely to skyrocket, so it is necessary to start from a more developed manufacturing technology. However, the most relevant thing is that, for the first time, the industry has a solution to the biggest problem that OLED presented. This solution is not an intermediate patch (like WOLED), software or … Read more