Apple’s, newest iPad and iPhone models incorporate these new touch sensor structures. The iPhone 5 uses in-cell touch technology, which is a major change to the touch structure since the first iPhone model in 2007. Meanwhile, the iPad mini features a DITOfilm structure.
“These two new projected capacitive touch sensor structures enabled Apple to reduce the thickness and weight of the iPhone 5 and iPad mini,” said Calvin Hsieh, Research Director, NPD DisplaySearch, in the press release. “These factors contribute to the consumer demand for these products, but manufacturing the new sensors has proven problematic.”
Apple sources the 4-inch 1136 × 640 (326 ppi) in-cell touch LCD from LG Display, Japan Display Inc., and Sharp under a license to use Apple’s in-cell touch patents. Under the terms of the agreement, these panel makers are not allowed to sell LCD panels of any size using Apple’s in-cell touch patents to other companies. Limited production along with the challenges in producing the new sensors with strict performance requirements have resulted in poor yield rates (70-80% or less) in the LCD panel manufacturing. These challenges have also led to a higher price for in-cell touch.
Figure 1: Touch Technology Shipments by Category in Mobile Phones
Source: NPD DisplaySearch Touch Panel Market Analysis
The iPad mini represents the first tablet PC display to incorporate a DITO film touch sensor, which is lighter and thinner than DITO glass (0.125 compared to 0.4 mm). However, there are challenges with production of the sensor on film and lamination since it is easily broken when stretched. Also, alignment of film sensors is more difficult than with rigid glass, especially for larger sizes. These challenges have resulted in low production yield rates, which have been a contributor to the higher entry price of $329 for the iPad mini. Other tablet PCs which are less expensive, use glass sensors or a one-glass solution with optical bonding.
“In-cell touch and DITO film offer some clear advantages, but at the expense of lower yield rates and higher costs—at least in the early stages of production,” added Hsieh. “Apple has concluded that the benefits of thinner, lighter devices will be highly valued by consumers.”
The NPD DisplaySearch 2012 Touch Panel Market Analysis offers a comprehensive breakdown of touch panel technologies and their market forecasts through 2018. This report provides detailed analysis of 23 applications (including TVs), 12 touch technology categories (including sensor-on-cover and gesture-in-air), and nine size categories. It also has details on touch controller ICs, the sensor market, shipments by area, and forecasts for multi-touch through 2018.
DisplaySearch surveyed over 200 suppliers of touch screen modules, controller ICs, ITO film, and other components to produce the 2012 Touch Panel Market Analysis. These firms are profiled in the report along with 2011 historical shipments and revenues for more than 110 touch screen suppliers.
Source: NPD DisplaySearch / The NPD Group, Inc.