Implementation of a Touch Screen Panel With Triangle Twist Sensor Pattern and Controller IC

Abstract

In this paper, a cost-effective touch screen panel with triangle twist (TAT) sensor pattern and its calibration algorithm are proposed. For touch detection, the proposed touch screen panel consists of one drive line to receive sensing information from two sensing lines. The proposed touch screen panel reduces the number of signal lines and bonding pads by about 42% compared to conventional touch screen panels, which decrease both the manufacturing difficulty and costs. By a simple calibration algorithm for the proposed touch screen panel with a TAT sensor pattern in a micro controller unit, the touch performance with respect to accuracy, precision, and linearity is considerably enhanced. The proposed touch screen panel shows reliable touch accuracy with errors less than 2 mm. As shown in the implementation results, the proposed touch screen panel is very effective in reducing manufacturing costs of touch devices, which suffer from implementation issues of signal lines caused by adopting a huge number of touch sensors.