Lab – The impressive anti-reflective treatment of the Lenovo Yoga 7i Carbon touch screen

For a few years now in Digital, we test the ability of the screens of our devices to reflect light using a Gloss Meter. First initiated on smartphones, this measure has been extended to TVs, monitors and laptops. Thus, all laptops that pass through our lab are also subjected to the Gloss Meter in order to determine the reflection rate of their screen, and therefore its brilliance. This measurement is also an integral part of the Screen score, in the same way as the colorimetry or the contrast ratio. Indeed, what could be more annoying than constantly adjusting your screen to limit the reflections of the light sources that surround you?

Thus, this percentage of reflection generally varies between 10 and 60% depending on the type of panel used and the presence of an anti-reflective treatment applied by the manufacturers, 100% being the equivalent of a mirror. In this game, laptops for gamers and their matte panels generally do best, with reflection rates below 20%; then come the glossy panels subjected to a more or less efficient anti-reflective treatment, with 20 to 30% light reflection. Above 40% light reflection, we are dealing with a shiny panel without efficient treatment.

A matte and tactile panel

The Lenovo Yoga 7i Carbon, currently being tested in the lab, features a “PureSight” IPS panel displaying 2560 x 1600 px with a refresh rate of 90 Hz. It is also tactile, something we had not noticed. Indeed, instead of having a glass overlay on the screen to make the slab tactile, the Yoga 7i Carbon has an integrated slab, like a non-touch screen, with a slight offset between the bezels and the slab. The French office of Lenovo, contacted on this subject, was unfortunately on vacation, and we were unable to obtain data on the technology used. The only information we were able to glean concerns the manufacturer of the IPS panel: CSOT, which is none other than the manufacturer of panels for TCL, and which belongs to the latter.

Switching to the Gloss Meter confirms our first impression, with a light reflection rate worthy of the best matte panels with only 17.78% reflected light, while the Asus Zenbook S 13 Oled tested a few weeks ago peaks at 51.66% reflected light.

This is therefore a good point for the Lenovo Yoga 7i Carbon, which offers touch without its drawbacks, namely the reflections and the weight of the glass overlay. The test of the ultraportable of 970 g follows its course and will be to be read very soon on Digital.