Patent ID: 9715311
Date: 2017-07-25
CPC Classifications: G06F

Claim:
1. An overhanging touch control system, comprising: a touch surface; a first overhanging transceiver circuit and a second overhanging transceiver circuit, respectively disposed at different edge positions on the touch surface, wherein the first overhanging transceiver circuit is configured to emit a first infrared signal to detect a first initial image upon initialization and detect a first real-time image after initialization, the second overhanging transceiver circuit is configured to emit a second infrared signal to detect a second initial image upon initialization and detect a second real-time image after initialization, and detection ranges of the first and second overhanging transceiver circuits overlap; and a controller, coupled to the first and second overhanging transceiver circuits, configured to determine a first image threshold and a second image threshold according to the first initial image and the second initial image, respectively, determine whether a reflective object is present at the detection range of the first overhanging transceiver circuit based on the first real-time image and the first image threshold, and determine whether the reflective object is present at the detection range of the second overhanging transceiver circuit based on the second real-time image and the second image threshold; wherein when the reflective object is absent in the detection range of the first overhanging transceiver circuit and the detection range of the second overhanging transceiver circuit, the controller is configured to periodically update the first image threshold to a fourth image threshold according to the first real-time image, and periodically update the second image threshold to a fifth image threshold according to the second real-time image.