Apple has informed its South Korean display partners this week regarding the development of a four-edge bending OLED display slated for the iPhone set to launch in 2028.
This new panel design will incorporate a transparent indium-zinc-oxide (IZO) cathode layer, replacing the existing magnesium-silver alloy.
This modification aims to mitigate image distortion and brightness reduction prevalent at the corners of the curved screen.
Both Samsung Display and LG Display, Apple’s exclusive OLED suppliers, have initiated preparatory investments to enable large-scale production of this innovative technology.
The Trigger: LG Display’s ₩1.106 Trillion Commitment
The timing of this revelation coincides with significant capital investments by LG Display. On April 22, the board sanctioned a substantial ₩1.106 trillion ($740 million) expenditure towards new OLED infrastructure, with financial outlay scheduled until June 30, 2028. Insider sources attribute this monumental commitment principally to Apple’s IZO-cathode initiative.
To cultivate the IZO cathode, manufacturers must employ a low-damage transparent conductive oxide (TCO) sputter tool, a distinct piece of machinery compared to the equipment utilized on current OLED production lines.
LG Display is reportedly acquiring this machinery initially for research and development, progressing towards mass production configurations.
Why the Cathode Material Matters
Contemporary smartphone OLED displays utilize a magnesium-silver alloy (Mg: Ag) for the cathode. While this alloy serves adequately in standard flat displays, it falters significantly in a four-edge bending panel, where the screen curves on all sides to eliminate bezels. Here, the alloy introduces noticeable distortion and diminished luminance at the bends.
In the realm of top-emission OLEDs, which dominate the smartphone market, light is emitted through the cathode rather than the substrate.
Transitioning to IZO enhances electrode transparency, effectively curtailing distortion at the panel’s curves. Industry experts assert that this transformation is vital for achieving commercial viability for the four-edge display.
Samsung Display: A New Line Considered Likely
Samsung Display, Apple’s other primary OLED supplier, has yet to disclose an equivalent investment, although the company is currently exploring various options.
Analysts note the substantial spatial constraints inherent in retrofitting an existing smartphone OLED line with TCO sputter equipment.
The consensus within the sector suggests that Samsung Display may need to invest in a dedicated new production line rather than attempting to adapt its current infrastructure.
Samsung’s cautious approach may partially stem from its existing commitments; the company is understood to be the primary supplier for Apple’s anticipated foldable iPhone expected in 2026, a program necessitating its own specialized panel production capacity.
The Two-Step Roadmap: 2027, Then 2028
Apple’s pursuit of the four-edge display technology is unfolding in two distinct phases. The initial iteration—featuring the existing Mg: Ag cathode—is scheduled for the 20th-anniversary iPhone slated for 2027, commemorating two decades since the debut of the original iPhone in 2007. The enhanced variant employing the IZO cathode will be introduced in the subsequent year’s model.
The 2027 device has been described by supply-chain insiders as integrating a “micro-curved” OLED from Samsung—characterized by a subtle curvature designed to circumvent the extreme “waterfall” edges seen on certain rival Android devices.
It remains unconfirmed whether this inaugural panel will utilize IZO or the traditional alloy cathode.
What It Means for the Korean Display Sector
The IZO initiative exemplifies Apple’s influence over the pace of display innovation among its suppliers.
LG Display’s projected total capital expenditures of around ₩2 trillion in 2026—with the ₩1.106 trillion OLED investment as a significant component—come in the wake of a ₩576 billion net loss reported in the first quarter, highlighting the company’s reliance on Apple contracts to restore profitability.
The overarching question for the industry revolves around whether Apple’s embrace of all-edge displays will catalyze their wider adoption within the Android market.
Should this occur, the capital investments by Samsung and LG at present could yield substantial dividends spanning beyond a singular Apple product line.
Source link: Techtimes.com.
