Next-gen OLED monitors chase CRT clarity, but Windows must evolve first

Twenty years ago, a college student spent an entire month's paycheck on a 26-inch Samsung LCD monitor—a state-of-the-art display that seemed impossibly thin and sharp compared to the family's aging CRT. It was 2007, the HD era was dawning, and the future looked brighter and crisper than ever. What that student didn't realize, standing in the glow of 1366x768 pixels, was what had been surrendered in the name of progress: the motion clarity of a CRT, a quality so fundamental to how images moved across a screen that its absence would go largely unnoticed for nearly two decades.

Today, display engineers and enthusiasts are trying to get that lost quality back. Mark Rejhon, who founded Blur Busters, a website dedicated to the technical minutiae of display performance, has spent years documenting what was lost in the LCD transition. "People older than 40 will generally remember the motion clarity of CRTs, while younger people who've never seen a CRT will not remember," he says. The LCDs that dominated the mid-2000s were particularly poor at rendering motion—pixels took too long to change color, leaving ghostly trails behind fast-moving objects. The jump to HD had been so visually seductive that the trade-off went largely unexamined.

The path back began in late 2024, when Rejhon and Timothy Lottes, a former Nvidia developer, unveiled what they called a breakthrough algorithm for simulating a CRT tube. The core insight was deceptively elegant: instead of inserting black frames between game frames (a technique called black frame insertion that causes noticeable flicker), they could recreate the phosphor fade effect of old CRTs—the gentle, rolling way electrons would scan across the screen to draw an image. On a 240 Hz or higher display, this simulation could make a game locked at 60 frames per second look as sharp and smooth as one running at 540 frames per second, without requiring the hardware to actually render 540 frames. "Both methods will show frames more briefly, like a fast camera shutter, and result in less display motion blur," Rejhon explained. "CRTs could flicker pixels brightly for less than 1/1000 second. The bonus with CRT is you do not require more frame rate to achieve low motion blur."

The hardware to test this technology arrived in the form of an Asus ROG PG27AQWP-W monitor capable of 540 Hz refresh rates—or 720 Hz at lower resolution. OLED panels, unlike the LCD displays that had dominated for two decades, can go completely black with no backlight bleed and achieve the kind of contrast that CRTs naturally offered. The higher refresh rate helps recreate that electron beam effect. But having the right monitor was only half the battle. The actual implementation of CRT simulation proved brutally difficult to deploy on consumer hardware.

The first working version appeared as a shader for Retroarch, an emulation frontend, but the technology was so complex that developer Mausimus split it into a separate tool called ShaderBeam. Getting it to work required a level of technical commitment that bordered on the obsessive. Users had to disable VRR, tweak graphics driver settings, unplug secondary monitors, use Process Lasso to prioritize the application, edit the Windows registry, and ideally split the rendering workload across two GPUs—using an integrated graphics chip to handle the CRT simulation while the main GPU rendered the game. "ShaderBeam tries to use whatever's available, like screen capture and window transparency," Mausimus said, "to compensate for the inability to insert itself into the rendering pipeline from source content to display." The tool was at the mercy of Windows scheduling algorithms that were never designed for this kind of precision timing.

When everything aligned correctly, the effect was striking. Playing Metroid Prime 2: Echoes in the Dolphin emulator, watching Samus's morph ball roll in tight circles while the room's columns remained pin-sharp—that was the moment the effort made sense. Normally, motion blur would obliterate fine details. With CRT simulation active, individual pixels remained visible even as the camera moved. The difference was as dramatic as jumping from 30 fps to a higher frame rate, yet nearly impossible to capture on camera or describe to someone without a 540 Hz display to see it on. But the practical reality was sobering: ShaderBeam required so much fiddling, so many compromises, that it made no sense for anyone but the most dedicated enthusiasts.

The real solution, experts believe, will come from the industry itself. Nvidia has already begun integrating backlight strobing and rolling refresh cycles into its G-Sync Pulsar monitors, creating a perceived clarity of 1,000 Hz. But the broader fix will require Microsoft to dig into Windows itself, building shader hooks directly into the operating system and giving developers proper access to the rendering pipeline. Rejhon predicts that by the 2030s, when video-processing GPUs are integrated into displays themselves, CRT simulation will become user-friendly enough for mainstream adoption. For now, the technology remains a proof of concept—a glimpse of what we lost and a reminder that sometimes the future requires going backward first.