Detector for a display

The invention discloses a detector for a display. According to the invention, an apparatus includes a light source to transmit non-visible light pulses strobed at a frequency and a duty cycle. A detector a detector receives a pattern of reflected light from a display in response to the non-visible light pulses. The pattern of reflected light had at least two different polarization states, where the detector determines a spatial location of the detector relative to the display based on discriminating between the at least two polarization states. 种装置包括用于发射以频率和占空比选通的不可见光脉冲的光源。检测器响应于该不可见光脉冲从显示器接收反射光的图案。该反射光的图案具有至少两种不同的偏振状态，其中该检测器基于区分至少两种偏振状态而确定该检测器相对于显示器的空间位置。