Devices and methods of image-splitting for dual-layer high dynamic range displays

Patent metadata

Field	Value
Publication number	US-2016170702-A1
Application number	US-201514836645-A
Country	US
Kind code	A1
Filing date	Aug 26, 2015
Priority date	Dec 12, 2014
Publication date	Jun 16, 2016
Grant date	—

Abstract

Systems and methods for reducing or eliminating image artifacts on a dual-layer liquid crystal display (LCD). By way of example, a system includes a first display panel and a second display panel. The system includes a processor coupled to the first display panel and the second display panel, and configured to generate a first image, and to generate a second image to be displayed on the first display panel based on the first image. The processor is configured to interpolate the second image. Interpolating the second image includes adjusting the second image according to a generated objective function bounded by a first constraint. The processor is configured to filter the second image, and to generate a third image to be displayed on the second display panel based on the first image and the second image. The third image is generated to prevent image artifacts on the second display panel.

First claim

What is claimed is:

1 . A system, comprising:
an enclosure, comprising:
a first display panel;
a second display panel, wherein the second display panel is coupled to the first display panel; and
one or more processors communicatively coupled to the first display panel and the second display panel, and configured to:
generate a first image;
generate a second image to be displayed on the first display panel based at least in part on the first image;
interpolate the second image, wherein interpolating the second image comprises adjusting the second image according to a generated objective function bounded by a first constraint;
filter the second image; and
generate a third image to be displayed on the second display panel based at least in part on the first image and the interpolated and filtered second image, wherein the third image is generated to reduce or substantially prevent an occurrence of image artifacts on the second display panel.

2 . The system of claim 1 , wherein the first display panel comprises a first plurality of pixels configured to display grayscale images.

3 . The system of claim 1 , wherein the second display panel comprises a second plurality of pixels configured to display color images.

4 . The system of claim 1 , wherein the one or more processors are configured to adjust the second image according to the generated objective function by starting with an upper constraint as the first constraint.

5 . The system of claim 1 , wherein the one or more processors are configured to adjust the second image according to the generated objective function bounded by the first constraint and a second constraint, and wherein the first constraint comprises an upper constraint of the objective function and the second constraint comprises a lower constraint of the objective function.

6 . The system of claim 1 , wherein the one or more processors are configured to filter the second image by applying a guided filter to smooth and increase uniformity of the second image.

7 . The system of claim 1 , wherein the third image comprises a contrast ratio approximately equal to a product of a contrast ratio of the first display panel and a contrast ratio of the second display panel.

8 . The system of claim 1 , wherein the image artifacts comprise a parallax image artifact, a halo image artifact, a clipping image artifact, or any combination thereof.

9 . A method of manufacturing a dual-cell electronic display, comprising:
providing a first display panel and a second display panel in a substantially stacked configuration, wherein the stack of the first display panel and the second display panel comprises:
a light source layer configured to provide a source of light to the first display panel;
a first polarizing layer of the first display panel disposed above the light source layer and configured to polarize the source of the light;
a first transistor layer of the first display panel disposed above the first polarizing layer;
a first liquid crystal layer of the first display panel disposed above the first transistor layer, wherein the first liquid crystal layer is electrically coupled to the first transistor layer and configured to modulate the polarized source of light at a first instance;
a second transistor layer of the second display panel disposed above the first liquid crystal layer;
a second liquid crystal layer of the second display panel disposed above the second transistor layer, wherein the second liquid crystal layer is electrically coupled to the first transistor layer and configured to modulate the polarized source of light at a second instance; and
a second polarizing layer of the second display panel disposed above the second liquid crystal layer.

10 . The method of claim 9 , wherein providing the first display panel and the second display panel comprises stacking the second display panel substantially atop the first display panel.

11 . The method of claim 10 , comprising electrically coupling the first display panel to the second display panel, and wherein the second display panel is configured to display one or images to be viewed by a user of the dual-cell electronic display.

12 . The method of claim 9 , wherein the stack of the first display panel and the second display panel does not include a diffuser layer or an air gap layer.

13 . The method of claim 9 , wherein the first display panel does not include a top polarizing layer, and wherein the second display panel does not include a bottom polarizing layer.

14 . The method of claim 9 , comprising including a color filter between the second polarizing layer and the second liquid crystal layer of the second display panel and excluding a color filter from the first display panel.

15 . A method for displaying an image on a dual-layer electronic display, comprising:
receiving an incoming image via the dual-layer electronic display; splitting the incoming image into a first image to be displayed on a back display panel of the dual-layer electronic display and a second image to be displayed on a front display panel of the dual-layer electronic display; blurring the first image according to a generated objective function based at least in part on an upper constraint of the objective function; applying a filter to the first image to smooth and increase a uniformity of the first image; and generating a third image to be displayed on the front display panel based at least in part on the first image and the second image, wherein the third image is generated to reduce or substantially eliminate an occurrence of a parallax artifact or a halo artifact on the front display panel.

16 . The method of claim 15 , wherein blurring the first image according to the generated objective function comprises searching for a solution of the objective function by starting with the upper constraint.

17 . The method of claim 15 , wherein applying the filter to the second image comprises applying a guided filter to smooth the second image and to retain apparent edges of the incoming image within the first image.

18 . The method of claim 15 , comprising downsampling and normalizing the first image prior to applying the filter to the first image.

19 . The method of claim 15 , wherein generating the third image comprises combining the first image and the second image to be displayed on the front display panel.

20 . The method of claim 15 , wherein generating the third image comprises generating a high dynamic range (HDR) and higher contrast ratio image as compared to the incoming image or the first image.

21 . An electronic device, comprising:
a first liquid crystal display (LCD) panel including a first plurality of pixels; a second LCD panel including a second plurality of pixels, wherein the second LCD panel is electrically coupled to the first LCD panel; and a graphics processing unit (GPU) configured to provide image data to the first plurality of pixels and the second plurality of pixels and to execute one or more image-splitting processes comprising:
splitting an original image into a grayscale image to be displayed on the first LCD panel and a color image to be displayed on the second LCD panel;
blurring the grayscale image according to one or more objective functions, wherein a solution search of the one or more objective functions is initialized based on an upper bound constraint of the objective function;
downsampling and normalizing the grayscale image to reduce a noise parameter of the

Assignees

• Apple Inc

Inventors

• Jiang Jun
• Chen Cheng
• Marcu Gabriel
• Wu Jiaying

Classifications

• G02F1/1368

  in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} · CPC title

• G09G2340/00

  Aspects of display data processing · CPC title

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title

• G09G2300/023

  Display panel composed of stacked panels · CPC title

• G02F2202/28

  Adhesive materials or arrangements · CPC title