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The headset’s dual 1440x1600 RGB LCDs provide 50% more subpixels than OLED, resulting in greater sharpness for the same rendering cost. In addition, the fill-factor is three times better than OLED, greatly reducing “screen door” effect. The Valve Index Headset runs at 120Hz with full back-compatibility to 90Hz, as well as an experimental 144Hz mode. Higher framerates improve realism and optical comfort, allowing longer and more comfortable play sessions. Displays have a reduced illumination period of 0.330ms to 0.530ms (framerate dependent), allowing imagery to remain just as sharp when your head is in motion as when you’re standing still. This is a 5x improvement over first-generation PC VR HMDs.