TSMC has circulated a 'CoWoS glass-substrate development plan' to its supply
chain, naming ABF substrate maker Ibiden and panelmaker Innolux to jointly
validate the feasibility of introducing glass substrates into CoWoS advanced
packaging. TSMC says this is its first public disclosure of glass-substrate
technical progress and indicates the technology has entered industrial
verification. The company cautioned glass substrates remain some way from full
mass production and further R&D is required on glass thickness and large-format
CoWoS package layouts.