US Patent 10104733 Portable illumination device

A portable illumination device includes a light source having a plurality of brightness levels and a touch control system, which is arranged for controlling an illumination of the light source, including a control system and a touch panel operatively connected to the control system, wherein the touch panel is configured for receiving a sliding touch operation, wherein the control system adjusts a current brightness level of the light source into an adjacent brightness level of the plurality of brightness levels in response to the sliding touch operation applied on the touch panel.