| dc.description.abstract | This thesis proposes two fingerprint recognition design which is hidden under the panel of mobile phone, one is suitable for Liquid Crystal Display (LCD) panel, and the other one is suitable for Organic Light-Emitting Diode (OLED) panel. LCD panel isn’t transparent, so it is difficult to realize fingerprint recognition under the panel. Therefore, we propose a design method to use the cover glass on the screen as the light guide plate. When the fingerprint is pressed on the glass surface, the ridge of fingerprint will Frustrated Total Internal Reflection (FTIR) and then record the fingerprint pattern. In addition, we designed a reflective surface at the entrance and exit pupil of cover glass. This reflective surface has the function of enlargement and reduction, so that the appearance can be bezel less. The screen ratio is achieved 98%. Finally, this design is implemented on LCD panel’s mobile phone to obtain a high-contrast fingerprint image. In the ultra-thin fingerprint recognition design under the OLED panel, we propose a design the uses photoresist stacking to make the collimator instead of the traditional Through Silicon Via (TSV) method, through this method can reduce the cost. Furthermore, the module thickness is less than 0.6 mm so that it can be place between the screen and the middle frame of the phone. This can provide an advantage that the size of battery is not affected by the fingerprint module. Finally, we implemented and assembled this module into the OLED panel and the middle frame of mobile phone, and used OLED panel to emit light to obtain fingerprint images with good contrast. | en_US |