According to an interesting story at Forbes, Sony may announce an OLED TV lineup at CES 2017 (in a month's time). The company may have already done so at a private event in the UK, but at CES it will do so (according to the speculation, at least) in public.
Sony will be using panels produced by LGD. Sony is actually producing its own large-size AMOLED panels, but only for its professional monitor range. Sony had a consumer OLED TV program, and used to collaborate with Panasonic on that, but that JV was cancelled in 2013. Since then Sony's TV unit produced and demonstrated several high-end LCDs using innovative technology in an effort to match LG's OLED TV performance.
Sony currently offers several professional monitors in several sizes (from 7.4" to 30") and in several series. Sony's OLED monitors provide a superior image quality compared to LCDs, and the cost difference is not so large because in these premium products the cost of the panel itself is a small portion of the total product cost. Sony already sold over 15,000 professional OLED monitors, and their latest monitor is the 30" 4K BVM-X300.
LGD's involvement with Sony was reported back in 2013, but was never confirmed - although the company did admit it is in talks with "Japanese TV makers" in 2015. Panasonic released its first OLED TV, the 65" curved 4K TX-65CZ950, in 2015, and in September 2106 the company revealed a 2nd-generation "reference" OLED TV prototype. Both OLED TVs use WRGB panels produced by LG Display.