Touch input device

A touch input device, comprising:

• a circuit board having an upper surface and a lower surface, the upper surface having a plurality of sensing regions arranged along a long axis direction;
• a plurality of illuminant elements disposed on the upper surface of the circuit board and arranged along the long axis direction;
• a reflective layer comprising a main reflective section, a first extension section, and a second extension section, wherein the main reflective section is disposed on the upper surface of the circuit board and has a plurality of through holes, the plurality of through holes are arranged along the long axis direction, and the plurality of illuminant elements extend through the plurality of through holes, respectively;
• a spacer disposed over the main reflective section of the reflective layer, the spacer having a top surface, a bottom surface, and a light-leaking edge, the spacer having a plurality of accommodation holes penetrating through the top surface and the bottom surface, the plurality of accommodation holes arranged along the long axis direction and respectively corresponding to the plurality of sensing regions and the plurality of through holes, wherein the plurality of illuminant elements extend into the plurality of accommodation holes, respectively;
• a plurality of light guide plates disposed in the plurality of accommodation holes of the spacer, respectively;
• a shielding sheet covering the top surface of the spacer, the shielding sheet having a sheet edge and a plurality of light permeable regions, the sheet edge corresponding to the light-leaking edge of the spacer, the plurality of light permeable regions arranged along the long axis direction and respectively corresponding to the plurality of light guide plates;
• and
• a top plate disposed on the shielding sheet, the top plate having a plurality of light-exit regions arranged along the long axis direction and respectively corresponding to the plurality of light permeable regions of the shielding sheet,
• wherein the first extension section of the reflective layer covers the light-leaking edge of the spacer and the sheet edge of the shielding sheet;
• the second extension section of the reflective layer is connected to the first extension section and combined with the top plate.