Granted Patent B2

US 12,731,557 · App. 19/093,957 · Granted Sep 8, 2026

Inventors: Kohei Koyama (Matsumoto, JP); Kazuhisa Mizusako (Shiojiri, JP)

Assignee: SEIKO EPSON CORPORATION

G09G3/3648G09G2320/0276

Abstract

Claims (43)

1 . A liquid crystal display device comprising:

a liquid crystal panel including panel pixels; and

a display control circuit configured to control the liquid crystal panel,

wherein

video data includes pixel data corresponding to the panel pixels, and the pixel data designates gradation levels of the panel pixels, and

the display control circuit is configured to:

perform first correction on each piece of pixel data included in the video data, based on a gradation level of gradation data of a panel pixel around each piece of pixel data;

detect a boundary at which a bright panel pixel, of which the gradation level designated by the pixel data subjected to the first correction is equal to or higher than a first threshold value, and a dark panel pixel, of which the gradation level is equal to or lower than a second threshold value, are adjacent to each other;

when there is a first boundary at which the gradation level designated by the pixel data of the bright panel pixel being a bright panel pixel related to the detected boundary and subjected to the first correction is equal to or higher than a third threshold value,

in a first bright panel pixel and a first dark panel pixel that are at the first boundary and that are adjacent to each other via the first boundary, the gradation level of the first bright panel pixel having been reduced during the first correction, the gradation level of the first dark panel pixel having been increased during the first correction,

perform second correction for bringing the gradation level designated by the pixel data of the first bright panel pixel subjected to the first correction closer to the first threshold value by further reducing the gradation level of the first bright panel pixel and bringing the gradation level designated by the pixel data of the first dark panel pixel subjected to the first correction closer to the second threshold value by further increasing the gradation level of the first dark panel pixel; and

supply a data signal corresponding to the corrected gradation level to the panel pixel.

2 . The liquid crystal display device according to claim 1 , wherein the display control circuit is configured to reduce a difference between gradation levels designated by pixel data of adjacent panel pixels for each piece of pixel data included in the video data, as the first correction.

3 . The liquid crystal display device according to claim 1 , wherein

the boundary includes a second boundary in addition to the first boundary, and

when dark panel pixels and bright panel pixels of which the number is larger than the number of the dark panel pixels are adjacent to each other at the first boundary, and dark panel pixels and bright panel pixels of which the number is smaller than the number of the dark panel pixels are adjacent to each other at the second boundary,

the third threshold value is a value between a gradation level designated by pixel data of the bright panel pixels at the first boundary and a gradation level designated by pixel data of the bright panel pixels at the second boundary.

4 . A liquid crystal display device comprising:

a liquid crystal panel including panel pixels; and

a display control circuit configured to control the liquid crystal panel,

wherein

video data includes pixel data corresponding to the panel pixels, and the pixel data designates gradation levels of the panel pixels, and

the display control circuit is configured to:

detect a boundary at which a bright panel pixel, of which the gradation level designated by the pixel data included in the video data is equal to or higher than a first threshold value, and a dark panel pixel, of which the gradation level is equal to or lower than a second threshold value, are adjacent to each other; and

when a first boundary and a second boundary are detected as the boundary, the first boundary being between a bright panel pixel and a dark panel pixel that are immediately adjacent to each other, the first boundary being between a bright panel pixel and a dark panel pixel that are immediately adjacent to each other,

dark panel pixels and bright panel pixels, of which the number is larger than the number of the dark panel pixels, are adjacent to each other at the first boundary, and

dark panel pixels and bright panel pixels, of which the number is smaller than the number of the dark panel pixels, are adjacent to each other at the second boundary,

make an amount of correction for the pixel data of the bright panel pixels related to the first boundary smaller than an amount of correction for the pixel data of the bright panel pixels related to the second boundary, and

make an amount of correction for the pixel data of the dark panel pixels related to the first boundary larger than an amount of correction for the pixel data of the dark panel pixels related to the second boundary.

5 . A control method for a liquid crystal display device,

the liquid crystal display device including

a liquid crystal panel including panel pixels, and

a display control circuit configured to control the liquid crystal panel, in which

video data includes pixel data corresponding to the panel pixels, and the pixel data designates gradation levels of the panel pixels,

the control method comprising:

by the display control circuit,

performing first correction on each piece of pixel data included in the video data based on a gradation level of gradation data of a panel pixel around each piece of pixel data;

detecting a boundary at which a bright panel pixel, of which the gradation level designated by the pixel data subjected to the first correction is equal to or higher than a first threshold value, and a dark panel pixel, of which the gradation level is equal to or lower than a second threshold value, are adjacent to each other;

when there is a first boundary at which the gradation level designated by the pixel data of the bright panel pixel being a bright panel pixel related to the detected boundary and subjected to the first correction is equal to or higher than a third threshold value,

in a first bright panel pixel and a first dark panel pixel that are at the first boundary and that are adjacent to each other via the first boundary, the gradation level of the first bright panel pixel having been reduced during the first correction, the gradation level of the first dark panel pixel having been increased during the first correction,

performing second correction for bringing the gradation level designated by the pixel data of the first bright panel pixel subjected to the first correction closer to the first threshold value by further reducing the gradation level of the first bright panel pixel and bringing the gradation level designated by the pixel data of the first dark panel pixel subjected to the first correction closer to the second threshold value by further increasing the gradation level of the first dark panel pixel; and

supplying a data signal corresponding to the corrected gradation level to the panel pixel.

6 . An electronic apparatus comprising the liquid crystal display device according to claim 1 .

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (14)