they had been thriving on; despite being an expert on the vacuum tube himself, Ibuka saw potential of the novel technology and had Morita negotiate the terms for licensing, making Sony into one of the earliest and the youngest licensees of the transistor, together with Texas Instruments. In 1957, Sony employee Leo Esaki and his colleagues invented a tunnel diode (usually referred to as Esaki diode) by which they discovered the quantum tunneling effect in solids, for which Esaki received the Nobel prize in Physics in 1973. Sony has commanded a dominant share in the charge-coupled device market. As of 2020, Sony is the world's largest manufacturer of CMOS image sensors as its chips are widely used in digital cameras, tablet computers, smartphones, drones and more recently, self-driving systems in automobiles. As of 2020, the company, through its chip business arm Sony Semiconductor Solutions, designs, manufactures, and sells a wide range of semiconductors and electronic components, including image sensors (HAD CCD, Exmor), image processors (BIONZ), laser diodes, system LSIs, mixed-signal LSIs, emerging memory storage, emerging displays (microLED, microOLED, and holographic display), multi-functional microcomputer (SPRESENSE), etc. In 2020, Sony has launched the first intelligent vision sensors with AI edge computing capabilies. Game & Network Services Sony Interactive Entertainment (formerly Sony Computer Entertainment) is best known for producing the popular line of PlayStation consoles. The line grew out of a failed partnership with Nintendo. Originally, Nintendo requested Sony to develop an add-on for its Super Nintendo Entertainment System that would play CD-ROMs. In 1991 Sony announced the add-on, as well as a dedicated console known as the "Play Station". However, a disagreement over software licensing for the console caused the partnership to fall through. Sony then continued the project independently. Launched in 1994, the first PlayStation gained 61% of global console sales and broke Nintendo's long-standing lead in the market. Sony followed up with the PlayStation 2 in 2000, which was even more successful. The console has become the most successful of all time, selling over 150 million units . Sony released the PlayStation 3, a high-definition console, in 2006. It was the first console to use the Blu-ray format, and was considerably more expensive than the competitors Xbox 360 and Wii due to the Cell processor. Early on, poor sales performance resulted in significant losses for the company, pushing it to sell the console at a loss. The PlayStation 3 sold