US 12,189,127 B2
Projection device and projection method for head mounted display based on rotary MEMS fast scanner
Tapani Matias Alasaarela, Espoo (FI); and Simo Kaarlo Tapani Tammela, Espoo (FI)
Assigned to Microsoft Technology Licensing, LLC, Redmond, WA (US)
Filed by Microsoft Technology Licensing, LLC, Redmond, WA (US)
Filed on Jul. 5, 2023, as Appl. No. 18/218,439.
Application 18/218,439 is a continuation of application No. 16/523,706, filed on Jul. 26, 2019, granted, now 11,740,458.
Prior Publication US 2023/0350205 A1, Nov. 2, 2023
Int. Cl. G02B 27/01 (2006.01); G03B 21/00 (2006.01); G03B 21/20 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 27/0176 (2013.01); G03B 21/008 (2013.01); G02B 2027/0178 (2013.01); G03B 21/2033 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A head mounted display (HMD) comprising:
a microscopic mirror;
a microelectromechanical system (MEMS) coupled to the microscopic mirror and configured to tilt the microscopic mirror at varying scan angles along a scanning axis, wherein the microscopic mirror is rotatable about a rotation axis, which is different than the scanning axis, and wherein, when a tilt angle of the microscopic mirror is set to a value of 0, the rotation axis is perpendicular to a plane formed by the microscopic mirror; and
a light emitter that directs light into the microscopic mirror, wherein the light emitter is modulated based on a position of the microscopic mirror due to the microscopic mirror being tilted along the scanning axis and rotated about the rotation axis,
wherein the HMD generates an image by scanning the light in accordance with a curvilinear scan pattern, and
wherein the MEMS is further configured to deform the light differently for different scan angles, said deforming enables pixels of different sizes to be projected.