Patent ID: 9134113
Filing Date: 2015-09-15
Classification: G01B,G06F

Abstract:
1. A position identification system, comprising: a first infrared light emitting diode; a second infrared light emitting diode; and a control circuit, coupled to the first infrared light emitting diode and the second infrared light emitting diode; wherein the control circuit controls the first infrared light emitting diode to emit a plurality of infrared rays with different intensities during a first period, and controls the second infrared light emitting diode to enter a receiving mode to serve as an infrared receiver during the first period, wherein the first period is divided into P sub-periods, wherein the first infrared light emitting diode emits the infrared ray with i wherein, when the second infrared light emitting diode detects a reflected infrared ray from an external object during the j wherein the control circuit controls the second infrared light emitting diode to emit a plurality of infrared rays with different intensities during a second period, and controls the first infrared light emitting diode to enter the receiving mode to serve as the infrared receiver during the second period, wherein the second period is divided into Q sub-periods, wherein the second infrared light emitting diode emits the infrared ray with k wherein, when the first infrared light emitting diode detects the reflected infrared ray from the external object during the m wherein the control circuit determines the position of the external object in accordance with the distance between the first infrared light emitting diode and the external object and the distance between the second infrared light emitting diode and the external object, wherein i, j, k, P, and Q are natural numbers, and 0≦i, j≦P, 0≦k, m≦Q.