LIGHT-EMITTING SIGN DEVICE AND LOW-POWER PREDICTIVE DIAGNOSIS BIDIRECTIONAL ADAPTIVE CONTROL SYSTEM COMPRISING SAME

A light-emitting sign device according to the present invention comprises: a solar cell; a battery module comprising at least one battery in which power generated by the solar cell is stored; a light-emitting module for emitting light by the power supplied from the battery; a front panel optically coupled to the light-emitting module; and a controller for applying, to the light-emitting module, a target mode determined, from among driving modes, on the basis of an average value of solar cell voltages measured for a certain period with respect to the solar cell and a voltage value of a battery voltage measured at a certain time with respect to the battery module.