This invention provides a display element that has a simple member construction, can be driven at a low voltage, has high display contrast and white display reflectance, and has reduced unevenness in images. After forming gate electrodes and others, sources, drains and channels are formed by doping impurities, and laser is irradiated to improve the crystallization. The self-heating adjustment module and the sub-threshold lasing module are preferable both used together and driven by a common signal, for example the burst_enable signal that facilitates transmission from the light source. Using the selection criteria, one or more templates are selected from a template database as recommended templates.