At the 78th Emmy Awards on Monday evening, John Ternus, the new head of Apple, made his first public appearance with the iPhone Duo, a foldable smartphone not yet on sale. The device was seen open for the first time outside a demonstration room, with a gray, faded home screen. The image quickly circulated on X (formerly Twitter) within an hour, sparking concerns about the device's screen quality, a topic that had been discussed for three days prior. The concerns were triggered by a post from Ice Universe, a well-known leaker, who claimed the Duo would have "a less visible crease, but a less sharp and less bright screen," with a "foggy" appearance under certain lighting. This was later confirmed by The Tech Chap in a hands-on review on Wednesday, which noted that the nanotexture used on the screen visibly reduces contrast on the MacBook Pro and could make films appear less vibrant compared to the bright screen of a Galaxy Z Fold 8. The nanotexture is a microscopic engraving of the screen surface, replacing the smooth surface with a pattern of tiny lenses. This diffuses ambient light, reducing reflections. Apple has used this technology since 2019 on devices like the Pro Display XDR, Studio Display, iPad Pro M4, and MacBook Pro, typically as an optional upgrade on glass. On the iPhone Duo, it is applied for the first time on polymer, the flexible layer of a foldable screen, using a maskless laser lithography process. Apple has enhanced the effect by using a hinge that supports the center of the panel and stacking glass above and below the OLED layer. While the crease is still visible to the touch, it is less noticeable in use. According to measurements, the nanotexture has minimal impact on brightness and color gamut. The MacBook Pro M4 with nanotexture had 556 nits of brightness, slightly less than the standard 559 nits, and 80.2% of the DCI-P3 color gamut, compared to 79.1% for the glossy version. The iPhone Duo is advertised with the same brightness levels as the iPhone 18 Pro: 1,000 nits in normal use, 1,600 in HDR, and 3,000 in full sun. However, the nanotexture can cause a slight grain, a colored flicker on light areas, and slightly less sharpness, with text appearing "slightly softer" according to testers. The perceived contrast in a well-lit room is lower because the diffused light raises the level of black. In complete darkness, the OLED remains as clear as usual, but under ambient light, the matte surface loses some depth. The nanotexture is also less durable than glossy glass, as shown in resistance tests, and it retains fewer fingerprints but is harder to clean. Apple has added a scratch-resistant coating on the Duo, but the contact layer remains a polymer, which is more prone to damage. Samsung, Xiaomi, and other Android manufacturers have not used the nanotexture on foldable smartphones, opting instead for glossy surfaces with chemical anti-reflective treatments and mechanical solutions to flatten the crease. Apple's decision to use the nanotexture is based on its different sales strategy, focusing on the promise of a screen that unfolds without a visible line and without reflections. The iPhone Duo is also marketed as an iPad mini for reading, writing, and annotating with an Apple Pencil, where the matte surface is an advantage. The area above the hidden FaceTime camera is not engraved to allow light to reach the sensor, creating a glossy spot on an otherwise matte screen. The iPhone Duo is expected to be available starting October 23, with a price of 2,339 euros. Potential buyers are advised to see the screen in person before ordering, as the visual experience may vary under different lighting conditions.