Patent ID: 8773399

Claim:
A touch display device, comprising: a display panel having a display surface; a touch panel disposed above the display panel and comprising: a transparent part having a first surface, a second surface and at least one side surface, wherein the first surface and the second surface are opposite to each other, the second surface is configured to face the display surface, the at least one side surface is connected between the first surface and the second surface; a plurality of first light guide parts configured to protrude from the first surface and disposed at two adjacent sides of the transparent part, wherein each first light guide part has a first reflective surface; a plurality of second light guide parts configured to protrude from the first surface and disposed at another two adjacent sides of the transparent part, wherein the second light guide parts and the first light guide parts corporately defines a touch region on the first surface, each second light guide part has a second reflective surface, the first reflective surfaces and the second reflective surfaces each are configured to face the touch region; and at least one third light guide part configured to protrude from the second surface and disposed at one side of the transparent part so as to be close to the at least one second light source wherein the at least one third light guide part has a total-reflection surface, the total-reflection surface and the transparent part are configured to have an angle θ therebetween, the angle θ satisfies an equation of θ<(45° −sin −1 (1/n)), wherein n is the light refractive index of the touch panel; a plurality of first light sources disposed under the touch panel and corresponding to the first light guide parts and each configured to emit invisible light beams, the invisible light beams are emitted into the touch panel through the second surface, the first surfaces each are configured to reflect the invisible light beams thereby reflecting the invisible light beams sequentially above the touch region and to the corresponding second reflective surface; a plurality of light sensors disposed under the touch panel and corresponding to the second light guide parts and each configured to receive the invisible light beams reflected by the corresponding second reflective surfaces; and at least one second light source disposed beside the at least one side surface and configured to emit visible light beams, wherein the visible light beams are emitted into the touch panel through the at least one side surface.