When Japan Display Inc. broke ground on a new factory in central Japan in 2015, the future looked bright for one of the world¡¯s top vendors of liquid crystal display (LCD) panels.

The plant would strengthen the company¡¯s position as the primary screen supplier for Apple Inc. as sales of the iPhone 6 soared. And the U.S. smartphone juggernaut said it would front most of the $1.5 billion in costs, with Japan Display paying it back with a percentage of screen sales, according to two company sources.

Four years later, Apple¡¯s shifting fortunes have brought Japan Display to its knees and threaten to end Japan¡¯s long run as a leader in display technology.