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**Hard Progress in AR Display Technology Invention **
The hardest part in AR technology invention lies in perfecting the display, with industry giants like Apple focusing on DLP technology and Google on quantum dots. Multiple approaches by different players are crucial for success in the industry. Despite significant progress with full AR glasses prototypes boasting exceptional performance, the manufacturing process remains costly and complex. Engineering breakthroughs require surpassing not just technological but also economic challenges, like ensuring production at a reasonable cost and high yield rates. The evolution of consumer electronics pricing poses a challenge as modern consumers are unlikely to pay exorbitant amounts, making innovation in AR display technology even more demanding.