LG Display, a supplier to Apple, said in a statement that Chief Executive Han Sang-beom offered to step down over mounting losses.
LG Display has been struggling with a global supply glut in liquid-crystal displays (LCDs) used in television sets, which has pushed down prices. Like many other global tech companies, it is also dealing with uncertainties caused by a Sino-U. S. trade dispute involving import tariffs on tech goods and services.
The display maker said in a statement it held an emergency board meeting to accept Han's resignation and appointed Jeong, the current chief operation officer and chief finance officer at LG Chem.
The appointment of a new CEO is subject to the approval of shareholders at a meeting scheduled next March.
In the second quarter, LG Display said its operating loss widened to 369 billion won ($313.02 million) from 228 billion won a year earlier, hit by declining prices of its main product, 50-inch liquid-crystal displays (LCDs).
"The global supply and demand balance in the display industry is still off as government-backed Chinese display makers are pouring out panels, leading to drop the display prices," said Park Sung-soon, an analyst at Cape Investment & Securities.
LG Display's crosstown rival Samsung Display said in August it is considering suspending one of its LCD production lines in South Korea due to a supply glut.