US Patent No. 10,168,837

INFRARED LIGHT ADJUSTMENT METHOD AND POSITION DETECTION SYSTEM


Patent No. 10,168,837
Issue Date January 01, 2019
Title Infrared Light Adjustment Method And Position Detection System
Inventorship Kazuya Inoue, Tokyo (JP)
Assignee NEC DISPLAY SOLUTIONS, LTD., Tokyo (JP)

Claim of US Patent No. 10,168,837

1. An infrared light adjustment method for adjusting a direction of infrared light that is projected so that the infrared light passes over a displayed image from a rotatable projection device that is rotatable with each of a first axis and a second axis that is orthogonal to the first axis as axes of rotation, the method comprising:arranging said projection device such that a plane that contains said first axis and a line that is perpendicular to an upper edge or a lower edge of said displayed image is orthogonal to a surface on which said displayed image is displayed;
displaying a first image that represents a first target on said line as said displayed image;
rotating said projection device with said second axis as the axis of rotation such that a position of irradiation of said infrared light upon an indicator in said displayed image, in which is represented a captured image that captures a state of said indicator that points to said first target being irradiated by said infrared light, coincides with a position of said first target in said displayed image;
displaying, as said displayed image in place of said first image, a second image that represents a second target at a location that is different from said line; and
rotating said projection device with said first axis as the axis of rotation such that the irradiation position of said infrared light upon said indicator in said displayed image, in which is represented a captured image that captures a state of an indicator that points to said second target being irradiated by said infrared light, coincides with a position of said second target in said displayed image.