Patent ID: 8378995

Claim:
A touch display system, comprising: a flexible touch screen comprising a touch display surface and an opposite back surface; a substantially isosceles right-angled triangular prism, comprising a first side surface, a second side surface and a hypotenuse surface, the first side surface being disposed adjacent to but spaced apart from the back surface of the touch screen by an air gap, wherein when a touch is applied to the touch display surface at a touch position, the touch screen is bent at the touch position and contacts the prism at a contact position corresponding to the touch position; an infrared light source and an infrared image sensor arranged adjacent to and facing the hypotenuse surface such that when the touch is applied to the touch display surface, at positions in the prism except the contact position, light beams emitted from the infrared light source and transmitted into the prism through the hypotenuse surface are totally reflected in sequence by the first side surface and the second side surface and then transmit out of the prism from the hypotenuse surface, and the infrared image sensor receives and converts the totally reflected light beams into image signals associated with positions in the prism except the contact position; and at the contact position, light beams emitted from the infrared light source and transmitted into the prism through the hypotenuse surface partially transmit out of the prism from the first side surface and are partially reflected by the first side surface, the partially reflected light beams are then reflected by the second side surface and then transmit out of the prism from the hypotenuse surface, and the infrared image sensor receives and converts the partially reflected light beams into image signals associated with the contact position; and a processor configured for processing the image signals from the image sensor and obtaining the contact position based on light intensities of the image signals, thereby obtaining the touch position on the touch display surface.