Patent ID: 9013560
Filing Date: 2015-04-21
Classification: H04N

Abstract:
1. In a three-dimensional (3D) TV receiver, a viewing range notification method, the method comprising: determining whether a viewing distance of a viewer is greater than or less than a particular distance, and whether a viewing angle is within a particular angular range; and providing a guide message to allow the viewer to change the viewer's viewing position if the viewing distance is determined to be greater than or less than the particular distance, or if the determined viewing angle is out of the particular angular range, wherein the step of determining comprises: receiving, via a plurality of ultrasonic receivers, ultrasonic signals transmitted from TV receiver glasses worn by the viewer, calculating a difference in transmission times for the ultrasonic signals transmitted to the plurality of ultrasonic receivers, determining the viewing position of the viewer based on the calculated difference in transmission times, and calculating the viewing distance and the viewing angle.