US 12,253,676 B2
Virtual image display system with enhanced resolution for virtual reality and augmented reality devices
Jiunn-Yiing Lai, New Taipei (TW); and Feng-Chun Yeh, Taipei (TW)
Assigned to HES IP HOLDINGS, LLC, Austin, TX (US)
Filed by HES IP HOLDINGS, LLC, Austin, TX (US)
Filed on Dec. 21, 2023, as Appl. No. 18/393,525.
Application 18/393,525 is a continuation of application No. 18/017,840, granted, now 11,953,689, previously published as PCT/US2021/052750, filed on Sep. 30, 2021.
Claims priority of provisional application 63/085,172, filed on Sep. 30, 2020.
Prior Publication US 2024/0142778 A1, May 2, 2024
Int. Cl. G02B 27/01 (2006.01); G06V 10/10 (2022.01); H04N 13/332 (2018.01); H04N 13/351 (2018.01)
CPC G02B 27/0172 (2013.01) [G06V 10/16 (2022.01); H04N 13/332 (2018.05); H04N 13/351 (2018.05)] 11 Claims
OG exemplary drawing
 
1. A virtual image display system comprising:
a first light emitter emitting a plurality of first light signals to be projected into a viewer's first eye;
a first light direction modifier varying a light direction of the plurality of first light signals emitted from the first light emitter;
a first combiner to redirect and converge the plurality of first light signals to the viewer's first eye;
a second light emitter emits a plurality of second light signals to be projected into a viewer's second eye;
a second light direction modifier to vary a light direction of the plurality of second light signals emitted from the second light emitter; and
a second combiner to redirect and converge the plurality of second light signals to the viewer's second eye,
wherein the light direction of first light signals is varied at a first scan rate with respect to time within a first spatial range for displaying a first image frame with a predetermined number of light signals and the first scan rate is configured to be non-constant,
wherein each of the plurality of first light signals forms a pixel in the first image frame and a pixel density in the first image frame is configured to be not uniform, the first scan rate is decreased while rendering a central region of the first image frame, and the projection frequency of light emitter remains the same, such that the central region has the pixel density higher than that of a peripheral region of the first image frame,
wherein the light direction of second light signals is varied at a third scan rate with respect to time within a second spatial range for displaying a second image frame with a predetermined number of light signals and the third scan rate is configured to be non-constant; and
wherein a first light signal forming a pixel on the first image frame and a corresponding second light signal forming a pixel on the second image frame display a binocular virtual image pixel at a first depth which is related to a first angle between the first light signal and the second light signal projecting into the viewer's eyes.