Around the patents related to GaN-based blue LEDs, large-scale LED manufacturers have filed lawsuits in Japan and overseas. In 1996, Nichia Chemical Industry filed a lawsuit against the latter for Toyota Synthetic infringement of the company's patent. In order to counter it, Toyota Synthetic also sued the Nichia Chemical Industry, and since then it has initiated patent infringement and requires the other party's patent to be invalid. litigation. Not only for Toyota Synthetic, Nichia Chemical Industry has filed lawsuits with Cree, Taiwan's Epistar and Everlight Electronics, and Seoul Semiconductor.
The object of litigation is not limited to blue LEDs, but also includes white LEDs and GaN-based semiconductor lasers (blue-violet semiconductor lasers, etc.). Nichia Chemical Industry, which is the first in the industry to mass produce blue LEDs and white LEDs, refused to provide the company's patent license in accordance with the policy of “selling products but not selling patentsâ€.
However, after entering 2002, this situation has changed a lot. The Nichia Chemical Industry first began to license the white LEDs to Citizen Electronics; in June 2002, it signed a cross-licensing contract with Germany's OSRAMGmbH and its group companies for patents on GaN-based light-emitting components; September 2002 Ended the patent infringement lawsuit that has been in sync with Toyota for six years. In October 2002, it signed a cross-licensing contract with LumiLEDs Lighting, LLC (now Philips Lighting). In November of the same year, it reached a settlement with Cree and signed a cross-licensing contract. As a result, the Nichia Chemical Industry has been the core, and a large number of LED manufacturers such as Toyota Synthetic, Osram, Philips Lighting and Cree have established a cooperative relationship.
Since the introduction of blue LEDs in 1993, Nichia Chemical Industry has reached a settlement with Toyota Synthetic in 2002.
After that, the patent dispute between Nichia Chemical Industry and LED manufacturers in Asia continued. However, in February 2009, Nichia Chemical Industry and South Korea's large LED manufacturer Seoul Semiconductor reached a settlement and signed a cross-licensing contract.
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