AUTOFOCUS HEAD MOUNTED DISPLAY DEVICE

• Main Authors: LIAO, CHENG-SHUN, CHEN, CHUN-MIN, CHEN, SUNG-NAN, CHEN, YENN, YOO, JINNOU
• Format: Patent
• Language: English; French; German
• Published: 09.11.2016
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

Autofocus head mounted display device, including an imager (10) and an eyeball tracker (11). The imager includes a display element (12, 32, 52), an optical element (13, 35, 55) and a controller (14, 38, 58). An image light is projected to one of the eyeballs (15a, 15b, 37, 47, 57) of the user by the display element. The convergence or divergence of the image light is adjusted by the optical element through the controller. The image is presented at an imaging position in front of the eyeballs of the user. The eyeball tracker is disposed at the position in front of the user's eyes. Both left eye and right eye rotational angles are detected simultaneously, so as to determine a focus position of the user's eyes. The eyeball tracker is connected to the controller. The optical element is adjusted by comparing the imaging position and the focus position, and the imaging position of the image is moved to the focus position. First and second polarizing beam splitters (31, 51; 33, 53) and a 1/4 wavelength plate (34, 54) may be disposed on the path of the image light.