Notch design of smartphone displays is estimated to raise manufacturing cost of display panels by more than 20 percent, according to IHS Markit.

According to the research firm, manufacturing cost of the 5.9-inch organic light-emitting diode (OLED) panel with notch design, as in the Apple iPhone X, is estimated to be $29. It is found to be 25 percent higher than manufacturing cost of full-display OLED panel without the notch design used in the 5.8-inch display for the Samsung Galaxy S9. Similar cost gap is also found in the thin-film transistor liquid crystal display (TFT-LCD). Manufacturing cost of a 6-inch notch TFT-LCD panel is estimated to be $19, 20 percent higher than similar-sized non-notch, full-display LCD panel.

"Notch cutting should accompany yield loss, resulting in increases in manufacturing cost. In case of TFT-LCD, a notch design may push up the manufacturing cost even to the level of rigid, full-screen OLED's," said Jimmy Kim, Ph.D. and senior principal analyst for display materials at IHS Markit. "For OLED panels, cost increase caused by notch design seems to be even higher."