Apple’s manufacturing partners are running into a few speed bumps creating the new high-resolution Retina Display for the iPad 3, CNET reported recently. LG CEO Young Soo Kwon¬†confirmed that his company, which also builds the Retina Display on the iPhone 4 and 4S, is working on the next-generation iPad 3 screens. Samsung and Sharp are also allegedly behind the development. However, CNET said that mass manufacturing a display with a 2,048 x 1,536-pixel resolution, twice the pixel density of the current iPad 2, has been a struggle. “It’s not a question of just making one,” a source said. “That, of course can be done. The challenge is making lots of them. This is a quantum leap in pixel density. This hasn’t been done before.” In August, a report surfaced that suggested Apple had delayed the iPad 3 due to display issues. CNET said the companies have 1,600 x 1,200-pixel resolution screens prepared as a back-up in case the Retina Display can’t be mass produced in time.