Concerned about foldable phones’ durability? Here’s how Motorola tests the Razr hinge

That is one in all 4 upcoming Motorola Razr telephones getting opened and closed as soon as each 4 seconds. Over the course of 10 days, the telephones will probably be opened and closed 200,000 occasions.

Patrick Holland/PJDM

For my review of the latest Motorola Razr, which is now available, I examined the up to date foldable cellphone for 10 days in September. Often after I opened or closed the cellphone, an onlooker would react with disbelief. One girl working behind the register of a espresso store’s to-go window truly gathered her (masked and socially distanced) co-workers and requested me to point out them how the Razr folded in half. After I demonstrated the display folding like paper, her response was: “That’s wonderful. The place do I get one?”

And that is the “magic” of foldable phones at their core. They seemingly do the not possible by letting you are taking one thing rectangular and inflexible and fold it into one thing smaller than a drink coaster. That magic comes from years of design, testing and revisions. And the engineers and designers who labored on the upcoming Motorola Razr know it is something however magic to make a 6.2-inch cellphone fold in half.

However all that work might be simply overshadowed. The assessment models of 2019’s Samsung Galaxy Fold raised the flag about how folding screens would work in the true world. Quite a few them had defects that allow mud or different particles get beneath the display and wreak havoc. Any issues folks had about folding shows have been immediately amplified.

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Motorola Razr: We got a peek at how the screen is tested


Then in February 2020 after months of delays, Motorola released its Razr (2019) with a foldable screen and PJDM’s video team tested the display’s durability. My colleague Chris Parker used a FoldBot and attempted to open and close the phone 100,000 times. After 27,000 folds the Razr (2019) wasn’t able to be tested further. Reflecting on that test and how SquareTrade modified its FoldBot to handle the Razr, Parker concluded:

“Does [it] really feel like a sturdy, resilient cellphone that can stand as much as prolonged real-world use? To me it does.”

These incidents may make you surprise if foldable screens are sturdy. And if that’s the case, how do we all know? Jeff Snow, basic supervisor of innovation merchandise at Motorola, thinks it is pure to ask sturdiness questions on foldable screens. 

“The brand new factor concerning the cellphone is the truth that the display folds open and you’ll mild it up,” mentioned Snow. “Individuals are not used to phones with these folding screens. So the questions of their minds are, ‘Is it going to final?’ ‘What number of occasions can I truly do this motion?'”

Motorola claims the display on its upcoming, up to date Razr (2020) might be folded 200,000 occasions. To provide you an thought what number of occasions that’s, you could possibly open and shut the cellphone 100 occasions a day for 5 years and nonetheless not hit that quantity.

To indicate me how the corporate decided and examined the variety of occasions the upcoming Razr’s display might be folded, I visited a lab at Motorola in Chicago — whereas carrying a masks and social distancing — to satisfy Snow and Tom Gitzinger, director and principal engineer of innovation and structure for Motorola. I bought to see for myself how Motorola exams the display on the upcoming Razr. 

Motorola’s display folding machine lab

In a room that appears like a university black field theater are quite a lot of lights all centered on a roughly 10-foot-wide machine. There’s a digital camera on a tripod pointing on the machine which supplies all the area an odd tv present vibe. On the highest of the waist-high machine on their backs, are 4 Razr (2020) telephones. The machine absolutely opens and closes all 4 telephones on the similar time again and again.


Listed here are two of the 4 telephones mid-close on the display fold check machine.

Patrick Holland/PJDM

All through the design and manufacturing course of, Motorola makes use of comparable machines to check the folds on the Razr (2020). In contrast to the Samsung Galaxy Z Flip, which is designed to be opened to quite a lot of positions, the Razr is constructed to both be absolutely open and flat or utterly closed. And in contrast to the Foldbot, Motorola’s machine makes use of a wire to open the Razrs completely flat and an arm to shut them shut. The wire is skinny sufficient to nestle between the 2 halves of the cellphone when it is closed.

To recreate these 200,000 folds in lower than 5 years’ time, the machine absolutely opens and closes the telephones as soon as each four seconds. There’s a calming high quality to listening to 4 telephones shut closed each four seconds. It is like a soft-sounding metronome. It takes Motorola 10 days to fold every cellphone 200,000 occasions with this machine.

House owners’ suggestions helps enhance the brand new Razr

Over the previous six months Motorola reached out to individuals who personal the Razr (2019) to find out how they use the cellphone. In accordance with Snow, Razr house owners open and shut their telephones on common 40 occasions a day. And “tremendous customers” (the 99th percentile), common 100 occasions a day. Therefore, Motorola designed the Razr (2020) to deal with 200,000 folds.

“We’re not altering the parameters of testing,” mentioned Snow. “However we wish to ensure that we’re understanding folks and exceeding their expectations.”

The display and hinge enable the Razr to fold in half

The cellphone’s “zero hole” design, display and hinge permits the Razr to attain a excessive degree of display sturdiness. The latest Razr (2020) largely makes use of that very same design because the Razr (2019) albeit with tweaks. In reality, if you wish to study extra concerning the hinge have a look under at a video I made final yr about its design and the way it permits the Razr (2019) to fold flat.

The display itself is made of 5 totally different layers after which sprayed with a tough coating. When the layers are mixed the display has a thickness of 355 microns (3.5 millimeters). To provide you a way of how skinny that’s, the Motorola Edge Plus makes use of the same OLED panel stack for the curved edges of its display which is thrice the thickness of the Razr’s show stack.

And it isn’t simply the show that’s folding in half. There are a variety of connections together with the 4 5G antennas that should traverse the hinge. And like different foldable telephones, the battery within the Razr is definitely two batteries, one on every finish. Not solely does this assist with stability, however it provides one other degree of complexity as each have to attach by means of the Razr’s hinge mechanism.

How Motorola addressed the squeak/creak

After I reviewed the Razr (2019) in February, it suffered from a squeak/creak. It was like a muffled crunching sound however loud. Throughout my time with the up to date Razr (2020), the squeak/creak was principally absent till Friday — my eighth day with the cellphone. And when it did squeak, it was a quieter sound, extra like breaking in a pair of latest leather-based boots. Gitzinger defined the noise by evaluating it to a bag of potato chips.

“You’ll be able to’t probably open a potato chip bag with out making a noise. It is tremendous skinny. It is much more crunchy and crinkly than one thing like this [the foldable display]. However the identical precept applies,” mentioned Gitzinger. “You have bought this large, vital floor that strikes round, and it is pushing air that creates a few of the noises. We have been capable of eradicate different noises by placing in some outdated friction adhesives and tapes and surfaces to allow every little thing to slip previous each other a bit extra simply.”

I requested a buddy how they felt concerning the squeak/creak on the newer Razr (2020) they usually mentioned it did not trouble them. I assume on the subject of display notches, foldable display creases and now foldable cellphone squeaks, some folks will get used to those issues whereas others will probably be aggravated.

Solely time will inform

With the enhancements made, Motorola is assured concerning the retooled Razr’s sturdiness. In reality, the corporate runs 40 totally different lab checks to check each the design and high quality of the cellphone throughout growth and manufacturing.

That mentioned, the true indicator for a way sturdy the display on the Razr (2020) or any foldable cellphone is time. Till then, identical to magic, foldable telephones require a bit of religion.

For extra particulars be sure to take a look at my review of the 2020 Motorola Razr.

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Patrick Holland