What exactly is short in the market? Your iPhone’s screen is one solid unit made up of several elements that are fused together with OCA (optically clear adhesive). The exterior glass, the digitizer panel (touch sensor), the polarizer and LCD panel. The LCD panel is the key component that is in short supply. Originally Apple had 3 manufacturers to produce LCD panels (LG, Sharp and Toshiba). Apple’s authorized manufacturers have the exclusive technology to produce LCD panels. Other Chinese manufacturers can copy the glass, digitizer, polarizers, OCA, flex cables, backlights, frames and everything except for the main component of the LCD assembly.