The HSD042GPW1-90000E-MX is a color active matrix thin film transistor (TFT) liquid crystal display (LCD) that uses amorphous silicon TFT as a switching device. 
It is a reflective-type display that operates in total reflection mode and consists of a TFT LCD panel, driving circuit, and front light system. 
With a 4.2-inch diagonal measurement, the active display area features a resolution of 300 horizontal by 400 vertical pixels.