Tokuro Ozawa

55.2: Integrated Active Matrix Capacitive Sensors for Touch Panel LTPS-TFT LCDs

We have developed active matrix capacitive sensors for detecting touch events in low-temperature polycrystalline silicon (LTPS) TFT LCDs with Fringe-Field Switching (FFS) technology. These sensors enable touch events to be detected regardless of ambient light and enable touch events to be input simultaneously at 3 or more points.

24.2: A 1300-dpi Optical Image Sensor Using an a-Si:H Photo Diode Array Driven by LTPS TFTs

We have developed a 1300-dpi optical image sensor using a hydrogenated amorphous silicon (a-Si:H) pin diode array driven by low-temperature polycrystalline silicon (LTPS) thin film transistors (TFT) on a glass substrate. This paper describes a new architecture for achieving a high-resolution optical image sensor using LTPS TFT production equipment.

Active‐matrix sensor in AMLCD detecting liquid‐crystal capacitance with LTPS‐TFT technology

— An active-matrix capacitive sensor for use in AMLCDs as an in-cell touch screen has been developed. Pixel sensor circuits are embedded in each pixel by using low-temperature polycrystalline-silicon (LTPS) TFT technology. It detects a change in the liquid-crystal capacitance when it is touched. It is thin, light weight, highly sensitive, and detects three or more touch events simultaneously.