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US 11,114,018 B2Granted
Light emitting display device and method for driving same
AssigneeLG Display Co., Ltd.
InventorsJung-Geun Jo, Tae-Uk Kim, Yu-Hoon Kim
Life of this patent
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Abstract
The present disclosure relates to a display device and a method for driving the same which can improve color unevenness in a low-grayscale (low-luminance) area and improve color accuracy and grayscale expression, and an image processor of a display device according to an embodiment identifies a low-grayscale area less than a threshold value according to an input maximum luminance and applies a grayscale reproduction mask thereto to reproduce a luminance of the low-grayscale area as a combination of the threshold value and a minimum value.
Claims20
A light emitting display device, comprising:
- an image processor for converting image data that is less than a threshold value into any one of either the threshold value and a minimum value using a grayscale reproduction mask that is based on the threshold value, outputting the converted image data, and outputting image data equal to or greater than the threshold value without changing the image data;
- a panel operatively coupled to the image processor, the panel including a plurality of subpixels having light emitting elements;
- and
- a panel driver operatively coupled to the image processor and the panel, the panel driver providing the output of the image processor to the panel,
- wherein, in a low-grayscale area less than the threshold value, positions of driven subpixels representing the threshold value and positions of driven subpixels representing the minimum value are varied over time when driving the panel.
2 more elements
A light emitting display device, comprising:
- an image processor for converting image data that is less than a threshold value into any one of either the threshold value and a minimum value using a grayscale reproduction mask that is based on the threshold value, outputting the converted image data, and outputting image data equal to or greater than the threshold value without changing the image data;
- a panel operatively coupled to the image processor, the panel including a plurality of subpixels having light emitting elements;
- and
- a panel driver operatively coupled to the image processor and the panel, the panel driver providing the output of the image processor to the panel, wherein positions of subpixels representing the threshold value and positions of subpixels representing the minimum value are varied according to a cumulative usage of each light emitting element and the threshold value.
1 more element
A light emitting display device, comprising:
- an image processor for converting image data that is less than a threshold value into any one of either the threshold value and a minimum value using a grayscale reproduction mask that is based on the threshold value, outputting the converted image data, and outputting image data equal to or greater than the threshold value without changing the image data;
- a panel operatively coupled to the image processor, the panel including a plurality of subpixels having light emitting elements;
- and
- a panel driver operatively coupled to the image processor and the panel, the panel driver providing the output of the image processor to the panel, wherein the image processor comprises:
- a threshold value look up table (LUT) for selecting a threshold value of each color corresponding to the input maximum luminance from a plurality of different threshold values set for colors and outputting selected threshold values for a plurality of maximum luminances;
- an element usage accumulator for accumulating output of a previous frame as a usage of each light emitting element;
- a mask generator for generating and outputting the grayscale reproduction mask of each color in consideration of the threshold value of each color output from the threshold value LUT and a cumulative usage of each light emitting element stored in the element usage accumulator;
- and
- a grayscale reproduction processor for comparing input image data with the threshold value of each color, comparing image data less than the threshold value of each color with each mask value determined in the grayscale reproduction mask of each color, converting the image data into the threshold value of each color or the minimum value, outputting the converted image data, and outputting image data equal to or greater than the threshold value of each color without converting the image data.
6 more elements
A method for driving a light emitting display device, comprising:
- selecting a threshold value of each color based on an input maximum luminance from a plurality of different threshold values set for colors;
- outputting selected threshold values for a plurality of maximum luminances;
- accumulating output of a previous frame as a usage of each light emitting element for each of a plurality of subpixels;
- generating a grayscale reproduction mask of each color in consideration of the selected threshold value of each color and a cumulative usage of each light emitting element;
- comparing input image data with the threshold value of each color;
- comparing image data less than the threshold value of each color with a corresponding mask value in the grayscale reproduction mask of each color;
- converting the image data into the threshold value of each color or a minimum value;
- outputting the converted image data;
- outputting image data equal to or greater than the threshold value of each color without converting the image data;
- and
- displaying the outputted image data on a panel.
8 more elements
Dependencies are inferred from the claim text.