Methods of driving light sources in a near-eye display

Patent metadata

Field	Value
Publication number	US-11209656-B1
Application number	US-202017063026-A
Country	US
Kind code	B1
Filing date	Oct 5, 2020
Priority date	Oct 5, 2020
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

A method including determining a maximum luminance location of a display based on a field of view of an eye of a user of the display, and driving a plurality of light sources in the display based on locations of the plurality of light sources with respect to the maximum luminance location of the display. The plurality of light sources is controlled to have different luminance levels in different display zones corresponding to different zones on the retina of the eye of the user. In some examples, the display zones of the display system that have higher luminance levels can be dynamically changed based on the field of view or the gaze direction of the eye of the user.

First claim

What is claimed is:

1. A method comprising:
determining a maximum luminance location of a display based on a field of view of an eye of a user of the display; and
driving a plurality of light sources in the display based on locations of the plurality of light sources with respect to the maximum luminance location of the display, wherein:
each light source of the plurality of light sources is driven by a respective drive circuit to emit light; and
for a first light source and a second light source in the plurality of light sources and associated with a same input display value, the first light source is driven to emit light at a first luminance level higher than a second luminance level of the second light source that is farther from the maximum luminance location than the first light source.

2. The method of claim 1 , wherein the maximum luminance location is at a center of the field of view of the eye of the user.

3. The method of claim 1 , wherein the maximum luminance location is within a field of view of a fovea of the eye of the user.

4. The method of claim 1 , wherein determining the maximum luminance location of the display includes tracking a position of the eye of the user with respect to the display.

5. The method of claim 1 , wherein driving the plurality of light sources comprises:
driving the first light source based on the input display value and a first relationship between input display values and luminance levels for light sources in a first display zone of the display; and
driving the second light source based on the input display value and a second relationship between input display values and luminance levels for light sources in a second display zone of the display,
wherein the luminance levels for the light sources in the first display zone are characterized by a first range larger than a second range of the luminance levels for the light sources in the second display zone.

6. The method of claim 1 , wherein a difference between the first luminance level and the second luminance level is less than a threshold value.

7. The method of claim 1 , wherein each light source of the plurality of light sources includes an organic light emitting diode (OLED) or a micro-light emitting diode (micro-LED).

8. A system comprising:
a display comprising a plurality of light sources; and
a display controller including a respective drive circuit for each of the plurality of light sources, the display controller configured to:
select a maximum luminance location of the display based on a field of view of an eye of a user of the system; and
drive the plurality of light sources based on locations of the plurality of light sources with respect to the maximum luminance location of the display,

wherein, for a first light source and a second light source in the plurality of light sources and associated with a same input display value, the display controller is configured to drive the first light source to emit light at a first luminance level higher than a second luminance level of the second light source that is farther from the maximum luminance location than the first light source.

9. The system of claim 8 , wherein the maximum luminance location is in a field of view of a fovea of the eye of the user.

10. The system of claim 8 , wherein the maximum luminance location is at a center of the field of view of the eye of the user.

11. The system of claim 8 , wherein the maximum luminance location is at a center of the display.

12. The system of claim 8 , wherein the display controller is configured to:
drive the first light source based on the input display value and a first relationship between input display values and luminance levels for light sources in a first display zone of the display; and
drive the second light source based on the input display value and a second relationship between input display values and luminance levels for light sources in a second display zone of the display,
wherein the luminance levels for the light sources in the first display zone are characterized by a first range lager than a second range of the luminance levels for the light sources in the second display zone.

13. The system of claim 8 , wherein a difference between the first luminance level and the second luminance level is less than a threshold value that is noticeable by the eye of the user.

14. The system of claim 8 , wherein the display controller is configured to drive each light source of the plurality of light sources based upon a distance from the light source to the maximum luminance location.

15. The system of claim 8 , further comprising an eye-tracking subsystem configured to:
track a position of the eye of the user with respect to the display; and
determine a gaze direction or the field of view of the eye of the user.

16. The system of claim 8 , wherein each light source of the plurality of light sources includes an organic light emitting diode (OLED) or a micro-light emitting diode (micro-LED).

17. A non-transitory machine-readable storage medium including instructions stored thereon, the instructions, when executed by one or more processors, cause the one or more processors to perform operations including:
determining a maximum luminance location of a display based on a field of view of an eye of a user of the display; and
driving a plurality of light sources in the display based on locations of the plurality of light sources with respect to the maximum luminance location of the display, wherein:
each light source of the plurality of light sources is driven by a respective drive circuit to emit light; and
for a first light source and a second light source in the plurality of light sources and associated with a same input display value, the first light source is driven to emit light at a first luminance level higher than a second luminance level of the second light source that is farther from the maximum luminance location than the first light source.

18. The non-transitory machine-readable storage medium of claim 17 , wherein the maximum luminance location is at a center of the field of view of the eye of the user.

19. The non-transitory machine-readable storage medium of claim 17 , wherein determining the maximum luminance location of the display includes tracking a position of the eye of the user with respect to the display.

20. The non-transitory machine-readable storage medium of claim 17 , wherein driving the plurality of light sources comprises:
driving the first light source based on the input display value and a first relationship between input display values and luminance levels for light sources in a first display zone of the display; and
driving the second light source based on the input display value and a second relationship between input display values and luminance levels for light sources in a second display zone of the display,
wherein the luminance levels for the light sources in the first display zone are characterized by a first range larger than a second range of the luminance levels for the light sources in the second display zone.

Assignees

• Facebook Tech Llc

Inventors

• Choi Min Hyuk
• Zhuang Zhiming
• Choi Wonjae
• Kim Cheonhong

Classifications

• G06F3/147 Primary

  using display panels · CPC title

• G06F3/013

  Eye tracking input arrangements (G06F3/015 takes precedence) · CPC title

• G02B27/0101

  characterised by optical features (G02B27/0172 takes precedence) · CPC title

• G02B27/0093

  with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking · CPC title

• G09G2354/00

  Aspects of interface with display user · CPC title