In order to improve the performance of systems and apply the dynamic display technology, a designing method of light guide plate (LGP) module for direct illumination is presented, one LGP structure based on the method is also demonstrated, and then the simulated results of module indicates the uniformity is larger than 80%, which can satisfy the need of illumination. The simulated result of large LGP made by many modules for dynamic display is showed, and the experiment of light guide plate module is demonstrated.