Global light compensation in a variety of displays

• US 10,262,603 B2
• Filed: 03/19/2015
• Issued: 04/16/2019
• Est. Priority Date: 03/26/2014
• Status: Active Grant

• Current Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Original Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Inventors: Ninan, Ajit, Wan, Chun Chi
• Primary Examiner(s): Xavier, Antonio
• Application Number:
  US15/128,348
• Publication Number:
  US 20180174534A1
• Time in Patent Office: 1,489 Days
• CPC Class Codes: G02B 6/0035 provided on the surface of the light guide or in the bulk of it
• CPC Class Codes: G02B 6/004 Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
• CPC Class Codes: G02B 6/005 provided by one optical element, or plurality thereof, placed on the light output side of the light guide
• CPC Class Codes: G02B 6/0061 to provide homogeneous light output intensity
• CPC Class Codes: G02B 6/007 Incandescent lamp or gas discharge lamp
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127

Abstract

A non-uniform illumination pattern is determined with a display panel of a display device. The non-uniform illumination pattern comprises different values of the one or more illumination properties in first and second spatial regions of the display panel. An illumination compensation pattern is generated based at least in part on the non-uniform illumination pattern. The illumination compensation pattern is configured to homogenize values of the illumination properties in a plurality of spatial regions of the display panel that include the first and second spatial regions, and implemented in the display device.

Claims

1. A method for controlling a display, the display comprising a backlight and a display panel illuminated by the backlight, wherein the backlight comprises one or more back light sources and a quantum dot layer and the display panel comprises one or more light modulation layers, wherein one of the one or more light modulation layers comprises light valves, the method comprising:

measuring color space values of the illumination in a first spatial region representing a first plurality of pixels of the display panel and in a second spatial region representing a second plurality of pixels of the display panel;

determining a first white point and a first color gamut of the first spatial region and a second white point and a second color gamut of the second spatial region so as to obtain a non-uniform illumination pattern;

deriving from the first and second white points and the first and second color gamuts of the first and second spatial region of the non-uniform illumination pattern transformation matrixes or transform functions representing deviations from a specific white point or a specific color gamut;

generating an illumination compensation pattern configured to homogenize the color space values of the first and second pluralities of pixels in the first and second spatial region by computing inverse transformation matrixes that negate the deviations represented by the transformation matrixes or by computing inverse transform functions that negate the deviations represented by the transform functions;

deriving drive values from algorithmic compensation implementing the illumination compensation pattern; and

controlling the light valves with the drive values.

2. The method as recited in claim 1, wherein the transformation matrixes or transform functions represent deviations from both the specific white point and the specific color gamut.

3. A display device configured to perform the method as recited in claim 1.

4. An apparatus comprising a processor and configured to perform the method as recited in claim 1.

5. A non-transitory computer readable storage medium, storing software instructions, which when executed by one or more processors cause performance of the method as recited in claim 1.

6. A computing device comprising one or more processors and one or more storage media storing a set of instructions which, when executed by the one or more processors, cause performance of the method as recited in claim 1.