Redux had managed to raise a total of $5 Million prior to the acquisition but the company has not revealed how much it paid to acquire the startup.
It reported that Redux is able to turn screens into a speakers by vibrating the screen itself using small actuators.
Redux's website is now dead.
It also has technologies that add haptic feedback on mobile displays, which provides vibrations to imitate what it feels like to push physical buttons.
It is unclear from a report in Bloomberg when exactly Alphabet bought Redux or what the terms of the deal were, and the startup seemingly went quiet sometime in the first half of 2017. The transfer of shares was confirmed on December 13 based on United Kingdom regulatory filings. Turning screens into speakers would help free up space inside smartphones for other components like bigger batteries. "When it comes to mobile phones, we are not only saving valuable real estate and creating a waterproof housing, we are eliminating the need for additional speaker holes and most importantly, improving the audio quality".
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So far, Redux has only been able to use its technologies inside PCs and some vehicle infotainment systems - but that could be about to change. However, both smartphones needed to have some bezels to make that possible.
Details of the deal remain undisclosed, but it's worth noting that Redux closed a $5m round in March previous year from investors including Arie Capital.
At the CES consumer electronics conference in Las Vegas this week, Google is heavily promoting its voice-controlled speakers that compete with Amazon's Echo device.