Near-Eye Light Field Display

• US 20140292620A1
• Filed: 06/16/2014
• Published: 10/02/2014
• Est. Priority Date: 08/04/2012
• Status: Active Grant

• Current Assignee: Vergent Research Pty., Ltd.
• Original Assignee: Paul Lapstun
• Inventors: Lapstun, Paul
• Granted Patent: US 9,965,982 B2
• Time in Patent Office: Days
• US Class Current: 345/6
• CPC Class Codes: G02B 26/08 for controlling the direction of light in light guides G02B6/35
• CPC Class Codes: G02B 26/0833 the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD G02B26/0825 takes precedence; micromechanical devices in general B81B
• CPC Class Codes: G02B 26/085 the reflecting means being moved or deformed by electromagnetic means
• CPC Class Codes: G02B 26/0875 by means of one or more refracting elements
• CPC Class Codes: G02B 26/10 Scanning systems
• CPC Class Codes: G02B 26/101 with both horizontal and vertical deflecting means, e.g. raster or XY scanners colour television using laser beams scanning a display screen H04N9/3129
• CPC Class Codes: G02B 27/0075 with means for altering, e.g. increasing, the depth of field or depth of focus
• CPC Class Codes: G02B 27/0093 with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking
• CPC Class Codes: G02B 30/10 using integral imaging methods
• CPC Class Codes: G02B 30/27 involving lenticular arrays
• CPC Class Codes: G02F 1/11 based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves acousto-optical deflection G02F1/33
• CPC Class Codes: G02F 1/29 for the control of the position or the direction of light beams, i.e. deflection
• CPC Class Codes: G02F 1/294 Variable focal length devices
• CPC Class Codes: G02F 1/33 Acousto-optical deflection devices circuit or control arrangements therefor G02F1/113
• CPC Class Codes: G06T 19/006 Mixed reality object pose determination, tracking or camera calibration for mixed reality G06T7/00
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 2360/141 the light conveying information used for selecting or modulating the light emitting or modulating element
• CPC Class Codes: G09G 3/003 to produce spatial visual effects
• CPC Class Codes: G09G 3/02 by tracing or scanning a light beam on a screen
• CPC Class Codes: G09G 5/10 : Intensity circuits
• CPC Class Codes: H04N 13/243 : using three or more 2D image sensors
• CPC Class Codes: H04N 13/302 : for viewing without the aid of special glasses, i.e. using autostereoscopic displays
• CPC Class Codes: H04N 13/383 : for tracking with gaze detection, i.e. detecting the lines of sight of the viewer's eyes
• CPC Class Codes: H04N 23/54 : Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
• CPC Class Codes: H04N 23/56 : provided with illuminating means
• CPC Class Codes: H04N 23/61 : based on recognised objects
• CPC Class Codes: H04N 23/67 : Focus control based on electronic image sensor signals
• CPC Class Codes: H04N 23/951 : by using two or more images to influence resolution, frame rate or aspect ratio
• CPC Class Codes: H04N 23/957 : Light-field or plenoptic cameras or camera modules
• CPC Class Codes: H04N 25/745 : Circuitry for generating timing or clock signals

Abstract

A near-eye light field display device for displaying a light field to at least one eye of a viewer, the device comprising an array of light field display elements, each display element adapted to display a time-varying light field view image, the display device configured to modulate the focus of the time-varying view image displayed by each display element according to a time-varying fixation depth of the at least one eye.

Claims

1. A near-eye light field display device for displaying a light field to at least one eye of a viewer, the device comprising an array of light field display elements, each display element adapted to display a time-varying light field view image, the display device configured to modulate the focus of the time-varying view image displayed by each display element according to a time-varying fixation depth of the at least one eye.

2. The device of claim 1, further comprising a gaze tracking system for tracking the gaze of at least one of the viewer'"'"'s eyes, thereby to estimate the fixation depth of the at least one eye of the viewer.

3. The device of claim 2, wherein the gaze tracking system comprises at least one camera.

4. The device of claim 2, wherein the gaze tracking system is configured to track the gaze of the at least one eye based on at least one of the group comprising:

a position of the eye;

a position of the sclera of the eye;

a position of the limbus of the eye; and

a position of the pupil of the eye.

5. The device of claim 1, wherein each display element further comprises a focus modulator for modulating the focus of the view image.

6. The device of claim 5, wherein the focus modulator comprises at least one element selected from the group comprising:

a lens;

a liquid crystal lens;

a liquid lens;

a deformable membrane mirror;

a deformable-membrane liquid-filled lens;

an addressable lens stack; and

an electro-optic lens.

7. The device of claim 1, wherein each display element further comprises:

(a) a beam generator for generating an output beam of light;

(b) a scanner for scanning the beam across a two-dimensional angular field corresponding to the light field view image; and

(c) a radiance modulator for modulating the radiance of the beam according to a radiance value associated with each discrete angular direction within the angular field.

8. The device of claim 7, wherein the beam generator comprises at least one light emitter selected from the group comprising:

a laser;

a laser diode;

a light-emitting diode;

a fluorescent lamp; and

an incandescent lamp.

9. The device of claim 7, wherein the beam generator comprises multiple light emitters with different emission spectra, the light emitters selected from the group comprising:

a laser;

a laser diode;

a light-emitting diode;

a fluorescent lamp; and

an incandescent lamp.

10. The device of claim 7, wherein the radiance modulator is intrinsic to the beam generator.

11. The device of claim 7, wherein the radiance modulator is selected from the group comprising:

an acousto-optic modulator;

an absorptive electro-optic modulator; and

a refractive electro-optic modulator.

12. The device of claim 7, wherein the scanner is selected from the group comprising:

an electromechanical scanning mirror;

an addressable deflector stack;

an acousto-optic scanner; and

an electro-optic scanner.

13. The device of claim 7, wherein the scanner comprises a biaxial electromechanical scanning mirror with at least one drive mechanism selected from the group comprising:

an electrostatic drive mechanism;

a magnetic drive mechanism; and

a capacitive drive mechanism.

14. The device of claim 7, wherein the scanner comprises a first scanner for scanning the beam in a first direction and a second scanner for simultaneously scanning the beam in a second direction, the second direction substantially orthogonal to the first.

15. The device of claim 14, wherein the first and second scanners are selected from the group comprising:

an electromechanical scanning mirror;

an addressable deflector stack;

an acousto-optic scanner; and

an electro-optic scanner.

16. The device of claim 1, further comprising at least one actuator for oscillating the display elements between at least two positions.

17. The device of claim 16, wherein the oscillation is resonant.

18. The device of claim 1, wherein each display element comprises a two-dimensional array of light emitters.

19. The device of claim 18, wherein each light emitter comprises at least one organic light emitting diode (OLED).