苹果折叠屏iPad研发遇阻，预计发布时间推迟至2029年或更晚

Core Insights - Apple is facing significant engineering challenges with its planned 18-inch foldable iPad, potentially delaying its release from 2028 to 2029 or later [1][3] - The estimated price of the foldable iPad is around $3000, which is three times the price of the current 13-inch iPad Pro, likely limiting market acceptance [1] - The prototype weighs approximately 3.5 pounds (about 1.59 kg), comparable to a MacBook Pro, which contradicts the iPad's portability concept [2] - Apple is collaborating with Samsung Display to develop a seamless 18-inch OLED panel, aiming to minimize screen creases, a challenge that is complex and costly [3] - The new tablet prototype, codenamed J312, does not feature an external display and resembles a Mac laptop when closed, with a size similar to a 13-inch notebook when opened [3] - Despite the setbacks, the foldable iPad project remains a crucial part of Apple's broader innovation strategy, which includes developing cutting-edge products like smart glasses and desktop robotic devices [3]