Apple Inc. /zigman2/quotes/202934861/composite AAPL -0.63% is designing and making its own display screens for the first time at a secret facility near its California headquarters, Bloomberg reported on Monday, citing people familiar with the situation. The company is testing small numbers of the screens as it gears up to invest in the development of next-generation MicroLED screens, Bloomberg reported. MicroLED screens are harder to make than the current OLED screens, as they use different light-emitting compounds and are expected to make devices slimmer, brighter and more power-efficient. The Apple move has implications for suppliers, inlcuding Samsung Electronics Co. /zigman2/quotes/209800866/delayed KR:005930 +1.33% , Japan Display Inc. /zigman2/quotes/204799605/delayed JP:6740 -4.17% , Sharp Corp. /zigman2/quotes/203224600/delayed JP:6753 +1.43% and LG Display Co. /zigman2/quotes/204226570/delayed KR:034220 +1.77% , as well as Synaptics Inc. /zigman2/quotes/208827271/composite SYNA +0.76% , which makes chip-screen interfaces. Apple shares were down 1.1% premarket but have gained 27% in the last 12 months, while the Dow Jones Industrial Average /zigman2/quotes/210598065/realtime DJIA +0.25% has gained 19% and the S&P 500 /zigman2/quotes/210599714/realtime SPX +0.01% has gained 16%.