Speculation surrounding the development of folding phones using OLED displays began to emerge more rapidly in 2018. In January 2018, it was reported that LG Electronics had obtained a design patent for a folding smartphone.[13] Later in June, it was reported that Microsoft had been developing a similar device as part of its Surface line, codenamed "Andromeda" (itself a spiritual successor to a dual-screen booklet tablet prototype Microsoft had been exploring in the late-2000's known as Courier),[14][15] while Samsung was also said to be developing such a device.[16]