Liquid crystal display

Patent metadata

Field	Value
Publication number	US-11869452-B2
Application number	US-202318095256-A
Country	US
Kind code	B2
Filing date	Jan 10, 2023
Priority date	Feb 25, 2022
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

In an image processing device, for each of one or two or more picture elements among a plurality of picture elements, the one or two or more picture elements having an input grayscale value included in the input image data being equal to or less than a first predetermined value, the second panel data correction unit corrects the second aperture ratio of each of at least one pixel among the plurality of pixels, the at least one pixel facing the one or two or more picture elements, so that an actual transmittance gets closer to a theoretical transmittance, and the first panel data generation unit generates the first aperture ratio for each of the plurality of picture elements by dividing a normalized input grayscale value included in the input image data by a normalized luminance included in the panel luminance distribution data.

First claim

What is claimed is:

1. An image processing device causing a display panel unit to display an image, the display panel unit including a first liquid crystal panel including a plurality of picture elements and a second liquid crystal panel facing the first liquid crystal panel and including a plurality of pixels, the image processing device comprising:
a second panel data generation unit configured to generate second panel data for controlling a second aperture ratio of each of the plurality of pixels based on input image data;
a second panel data correction unit configured to correct the second panel data;
a second panel luminance distribution generation unit configured to generate panel luminance distribution data of the second liquid crystal panel based on the second panel data after correction; and
a first panel data generation unit configured to generate first panel data for controlling a first aperture ratio of each of the plurality of picture elements based on the input image data and the panel luminance distribution data of the second liquid crystal panel,
wherein, for each of one or two or more picture elements among the plurality of picture elements, the one or two or more picture elements having a normalized input grayscale value included in the input image data being equal to or less than a first predetermined value, the second panel data correction unit corrects the second aperture ratio of each of at least one pixel among the plurality of pixels, the at least one pixel facing the one or two or more picture elements, to offset an amount of deviation of an actual transmittance of the picture elements from a theoretical transmittance of the picture elements, and
the first panel data generation unit generates the first aperture ratio for each of the plurality of picture elements by dividing the normalized input grayscale value included in the input image data by a normalized luminance included in the panel luminance distribution data.

2. The image processing device according to claim 1 ,
the display panel unit further including a backlight facing the second liquid crystal panel and having a plurality of light-emitting regions,
the image processing device further comprising:
a backlight data generation unit configured to generate backlight data for controlling each of a plurality of normalized luminances of the plurality of light-emitting regions based on the input image data;
a backlight data correction unit configured to correct the backlight data; and
a backlight luminance distribution generation unit configured to generate backlight luminance distribution data of the backlight based on the backlight data after correction,
wherein the second panel luminance distribution generation unit generates the panel luminance distribution data based on the second panel data after correction and backlight luminance distribution data, and
for each of one or two or more light-emitting regions among the plurality of light-emitting regions, the backlight data correction unit corrects the normalized luminance included in the backlight data to set the normalized luminance included in the backlight luminance distribution data to be greater than the normalized input grayscale value included in the input image data.

3. The image processing device according to claim 2 ,
wherein, for each of the one or two or more pixels, the backlight data correction unit and the second panel data generation unit each correct the backlight data and the second panel data to set a product of the normalized luminance included in the backlight luminance distribution data and the second aperture ratio included in the second panel data after correction to have a value greater than the normalized input grayscale value.

4. The image processing device according to claim 2 ,
wherein, for each of one or two or more pixels among the plurality of pixels, the one or two or more pixels having the normalized input grayscale value equal to or less than a second predetermined value, the backlight data correction unit corrects the backlight data of at least one light-emitting region among the plurality of light-emitting regions, the at least one light-emitting region facing the one or two or more pixels, to offset an amount of deviation of an actual transmittance of the pixels from a theoretical transmittance of the pixels.

5. The image processing device according to claim 1 , further comprising:
a panel transmittance correction unit configured to correct again the second panel data after correction,
wherein the second panel luminance distribution generation unit generates the panel luminance distribution data of the second liquid crystal panel using the second panel data corrected by the panel transmittance correction unit, and
for the one or two or more pixels among the plurality of pixels, the one or two or more pixels having the normalized input grayscale value equal to or less than the second predetermined value, the panel transmittance correction unit corrects the second panel data after correction to data indicating an actual transmittance corresponding to the second aperture ratio included in the second panel data after correction.

6. The image processing device according to claim 1 ,
wherein a resolution of the plurality of picture elements of the first liquid crystal panel is higher than a resolution of the plurality of pixels of the second liquid crystal panel.

Assignees

• Sharp Display Technology Corp

Inventors

• Goto Naoko

Classifications

• G09G3/3607 Primary

  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) · CPC title

• G09G3/2074

  using sub-pixels · CPC title

• G09G3/3426 Primary

  the different display panel areas being distributed in two dimensions, e.g. matrix · CPC title

• G09G2300/023

  Display panel composed of stacked panels · CPC title

• G09G2300/0465

  Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness · CPC title