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Reason 1. Technical reasons: The technology is immature, and the most important reason is that it cannot meet the requirements. The sapphire mobile phone screen concept was proposed by Apple in the last two years, and Apple has also laid out some related patents in advance. But sapphire is used in mobile phone screens, from sapphire crystal, crowbar, cutting, grinding and polishing, peripheral processing, and affixing to the screen. There are too many technical problems to solve. Most of the industrial chain companies have started research and development of technology from various aspects in the second half of 2013 and even in 2014. It is difficult to achieve high breakthroughs in all aspects and achieve high-yield mass production in a short period of time. 
Reason 2: Apple's cooperation object selection error: Apple chose the wrong partner, GTAT itself is the equipment manufacturer of sapphire crystal growth furnace, GTAT to do the long crystal and also processed to the sapphire screen, for GTAT has a short period of time A technical threshold that is difficult to cross. 1) Let GTAT produce sapphire screens, similar to let MOCVD manufacturers VEECO and Aixtron complete the design of MCOVD larger capacity crystal growth furnace within one year, and produce LED epitaxy, which is as difficult as processing high-efficiency LED chips, with short The technical threshold is difficult to cross; 2) Redesigning the sapphire crystal growth furnace of more than 200 kg and stable production, it takes at least one year. It takes more than one year to produce sapphire with the original crystal growth furnace and achieve high quality and high yield. 3) GTAT also needs processing equipment, such as crowbars, cutting equipment, etc., which are devices other than GTAT capability. From the beginning, the difficulty is visible. 4) Technical problems have led to the overall process from crystal growth to screen, and the overall yield is very low, resulting in the inability to quickly provide large-scale, high-quality sapphire screens. The High-tech LED Industry Research Institute believes that the industry has a specialization, and the production of sapphire screens requires industrial chain links from equipment, crystal growth, processing, and synthesis to participate in a rapid breakthrough.
Reason three, the cost problem: High-tech LED industry research institute believes that the cost and price issues are actually a false proposition. The cost of the previous 5.5-inch sapphire mobile phone screen is higher than 300 yuan, and can now be reduced to less than 200 yuan. GLII believes that if mass production is possible, even if the cost of a high-quality qualified sapphire screen is higher than 600 yuan, the possibility of its use is still more than 90%. Therefore, price is not the most important factor: 1) Apple is positioned in high-end mobile phones, and its sales prices in countries around the world even differ by more than 2,000 yuan; 2) the price of high-quality Apple mobile phone screen protectors, brightness enhancement films, etc. More than 200 yuan; 3) For Apple mobile phones, consumers are more than 10% price gap for a better quality experience.
What are the advantages and disadvantages of the sapphire mobile phone screen compared to the gorilla glass? What are the other properties besides the wear-resistant scratch? Can the sapphire screen be scaled up for mobile phones, and where are the time nodes? Stay tuned for the following analysis articles from Smart LED. High-tech LED: Sapphire for mobile phone screen possibility analysis (2) - Comparative analysis of the advantages and disadvantages of sapphire and gorilla glass. High-tech LED: Sapphire for mobile phone screen possibility analysis (3) - the possibility and time node analysis of sapphire applied to mobile phone screen. 
GLII: Sapphire for mobile phone screen possibility analysis (1) Apple Iphone6 ​​does not use sapphire analysis
[Text|High-tech LED Industry Research Institute (GLII)] In 2014, Iphone6 ​​failed to adopt or even partially adopt the sapphire mobile phone screen, which made the interests of consumers and sapphire industry chain disappointing. The high-tech LED industry research institute believes that the 2014 Iphone6 ​​unused sapphire essentially has the following three reasons: