Sony first began researching organic materials in 1994, and has since proceeded with the development of OLED technology targeting its use in practical applications. Sony first launched mass production of small sized, full-color OLED panels in 2004, achieving commercial use within mobile products. Sony subsequently positioned OLED as a key next generation display device, and further accelerated its research and development of OLED technology. Following more than ten years of OLED development, Sony has accumulated numerous related core technologies, such as Sony's proprietary "Super Top Emission" panel technology which enhances the brightness and color reproduction capability of OLED panels, as well as manufacturing technologies gained from Sony's experience of mass producing small sized OLED panels. In September 2007, Sony commenced mass production of its independently developed "Organic Panel", used in "XEL-1".