Modelisation of screen rupture during a mobile phone free fall

Sagem brand mobile phone enjoys a strong presence in world markets thanks to continuous technological innovations associated to a high level of quality. We will approach here the case of the mobile phone screen (LCD), major part of a mobile phone whose integrity must be ensured throughout the life of the product. The specifications sheet specifies strict standards concerning the shock resistance: LCD should not be damaged during a series of 2 X 10 falls at a determined height (corresponding to average human height). Answer of such requirements needs a best understanding and good analysis of the mechanical phenomena which appears in the LCD during the impact on the floor.