The invention relates to a lightweight ballistic shelter comprising mutually connectable modular panels of two sizes only. If motion of the user’s line of sight stops for a period of time greater than a fixed period of time, a shutter-release operation is performed. The image data sets are stored in a folder generated for each user. This ensures that the tube begins to deform outward before the rest of the upper die contacts it. With the disclosure, the light-emitting angle is increased while maximizing the utilization of the light. The transparent electrode is at an advantage in widening the surface of light emission in the p-type semiconductor layer, decreasing the operation voltage in the forward direction, and enabling the bonding pad to provide excellent adhesive strength.