TOUCH PANEL INPUT SYSTEM AND INPUT PEN

摘要

A touch panel input system of the present invention includes a touch panel integrated liquid crystal display device (100) and an input pen (60) for carrying out an input with respect to the liquid crystal display device (100). The liquid crystal display device (100) includes a liquid crystal panel (20) that is provided with a plurality of light sensor elements (30) and a backlight (10) that is provided with an infrared LED (12) which emits infrared light. In the liquid crystal panel (20), an infrared light transmitting section (24a) for selectively transmitting light in an infrared region is provided above a corresponding one of the plurality of light sensor elements (30). An infrared light reflecting member (62) is provided at a tip of the input pen (60). This allows obtainment of a touch panel input system which enables detection with high accuracy.