Apparatuses, systems, and methods for characterizing and calibrating displays

• US 10,070,123 B1
• Filed: 08/14/2017
• Issued: 09/04/2018
• Est. Priority Date: 08/14/2017
• Status: Active Grant

• Current Assignee: META Platforms Technologies LLC (Meta Platforms, Inc. (f/k/a Facebook, Inc.))
• Original Assignee: Oculus VR, LLC (Meta Platforms, Inc. (f/k/a Facebook, Inc.))
• Inventors: Yin, Ye, Hallam, Simon
• Primary Examiner(s): Natnael, Paulos M
• Application Number:
  US15/676,830
• Time in Patent Office: 386 Days
• Field of Search: 348189, 348188, 348192, 348175, 348180
• CPC Class Codes: G06F 3/147 using display panels
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 2340/14 Solving problems related to the presentation of information to be displayed
• 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 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 3/001 using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background slide projectors per se G03B23/00 = 42 HP
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/2092 Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165
• CPC Class Codes: G09G 5/10 Intensity circuits
• CPC Class Codes: H04N 17/004 for digital television systems
• CPC Class Codes: H04N 25/71 Charge-coupled device [CCD] sensors; Charge-transfer registers specially adapted for CCD sensors

Abstract

A display calibration apparatus may include a display mounting assembly with a mounting platform and a multi-axis positioning device coupled to the mounting platform for adjusting an orientation of the mounting platform. The display calibration apparatus may also include a camera device positioned to receive light emitted by a plurality of sub-pixels of a display mounted on the mounting platform. The camera device may include an image sensor array that captures light emitted by the plurality of sub-pixels of the display. In addition, the display calibration apparatus may include a camera lens and a focuser. The camera lens may be positioned to direct light emitted by the plurality of sub-pixels of the display onto the image sensor array of the camera device, and the focuser may be disposed between the camera device and the camera lens to move the camera lens axially along an optical axis of the camera lens.

Claims

1. A display calibration apparatus comprising:

a display mounting assembly comprising;

a mounting platform; and

a multi-axis positioning device coupled to the mounting platform for adjusting an orientation of the mounting platform;

a camera device positioned to receive light emitted by a plurality of sub-pixels of a display mounted on the mounting platform, the camera device including an image sensor array that captures the light emitted by the plurality of sub-pixels of the display;

a camera lens positioned to direct the light emitted by the plurality of sub-pixels of the display onto the image sensor array of the camera device; and

a focuser disposed between the camera device and the camera lens to move the camera lens axially along an optical axis of the camera lens.

2. The display calibration apparatus of claim 1, wherein the multi-axis positioning device comprises a parallel-kinematic structure.

3. The display calibration apparatus of claim 1, wherein the multi-axis positioning device comprises a 6-axis positioning device.

4. The display calibration apparatus of claim 1, wherein the camera device further includes a cooling assembly that cools the image sensor array.

5. The display calibration apparatus of claim 4, wherein the cooling assembly is disposed in a camera housing surrounding the image sensor array.

6. The display calibration apparatus of claim 4, wherein the cooling assembly includes a thermoelectric cooling device.

7. The display calibration apparatus of claim 1, further comprising a support frame that holds the camera device at a selected position relative to the display mounting assembly.

8. The display calibration apparatus of claim 7, wherein the focuser is coupled to the support frame to move the camera lens in at least one of a direction toward or a direction away from the display mounting assembly.

9. The display calibration apparatus of claim 7, wherein the camera device does not move relative to the support frame as the focuser moves the camera lens axially along the optical axis of the camera lens.

10. The display calibration apparatus of claim 1, wherein the image sensor array of the camera device comprises a charge-coupled device array.

11. A display calibration system comprising:

a display mounting assembly comprising;

a mounting platform; and

a multi-axis positioning device coupled to the mounting platform for adjusting an orientation of the mounting platform;

a camera device positioned to receive light emitted by a plurality of sub-pixels of a display mounted on the mounting platform, the camera device including an image sensor array that captures the light emitted by the plurality of sub-pixels of the display;

a camera lens positioned to direct the light emitted by the plurality of sub-pixels of the display onto the image sensor array of the camera device;

a focuser disposed between the camera device and the camera lens to move the camera lens axially along an optical axis of the camera lens; and

a calibration computing subsystem that controls each of the display mounting assembly, the camera device, and the focuser.

12. The display calibration system of claim 11, wherein the calibration computing subsystem receives image light information from the camera device.

13. The display calibration system of claim 12, wherein the calibration computing subsystem directs the multi-axis positioning device of the display mounting assembly to adjust the orientation of the mounting platform based on the image light information received from the camera device.

14. The display calibration system of claim 12, wherein the calibration computing subsystem directs the focuser to move the camera lens axially along the optical axis of the camera lens based on the image light information received from the camera device.

15. The display calibration system of claim 12, wherein the calibration computing subsystem determines a degree to which light emitted by each of the plurality of sub-pixels of the display is focused on the image sensor array.

16. The display calibration system of claim 12, wherein the calibration computing subsystem generates calibration data for driving the plurality of sub-pixels of the display based on the image light information received from the camera device.

17. A method comprising:

driving a plurality of sub-pixels of a display mounted on a mounting platform of a display mounting assembly, the display mounting assembly comprising a multi-axis positioning device coupled to the mounting platform;

receiving, from a camera device, image light information obtained by the camera device from light emitted by the plurality of sub-pixels of the display and captured by an image sensor array of the camera device; and

directing, based on the image light information received from the camera device, at least one of;

the multi-axis positioning device of the display mounting assembly to adjust an orientation of the mounting platform;

or

a focuser to move a camera lens axially along an optical axis of the camera lens;

wherein;

the focuser is disposed between the camera device and the camera lens; and

the camera lens is positioned to direct the light emitted by the plurality of sub-pixels of the display onto the image sensor array of the camera device.

18. The method of claim 17, further comprising determining a degree to which light emitted by each of the plurality of sub-pixels of the display is focused on the image sensor array.

19. The method of claim 17, further comprising generating calibration data for driving the plurality of sub-pixels of the display based on the image light information received from the camera device.

20. The method of claim 19, wherein generating the calibration data for driving the plurality of sub-pixels of the display comprises generating a correction factor for driving at least one sub-pixel of the plurality of sub-pixels of the display.