Samsung Display, the world's largest display maker was spun off from Samsung Electronics in April 2012. In July 2012 Samsung Mobile Display was merged into Samsung Display, which maintains two display units: OLED and LCD.
China Star Optoelectronics Technology (CSOT, also called Shenzhen Huaxing Photoelectric Technology) is a China based display producer (owned by TCL, Century Science & Technology Investment and Samsung Display). The company is producing small and large LCD panels and is developing OLED technologies.
In March 2012 it was reported that the company plans to enter the AMOLED market. The original plan was to start production by the end of 2012 in a 4.5-Gen LTPS line, but that never materialized. In October 2012 AUO filed a law suit against two of its former executives that allegedly stole technologies (including AMOLED related ones) from the company and supplied it to CSOT.
Sony is one of the leading consumer electronics companies in the world. Sony has been developing OLED technologies for many years and has been one of the pioneers in the field.