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US 12,731,519 B2Granted
Data driver and control method thereof
AssigneeLx Semicon Co., Ltd.
InventorsWon Kim, Yong Hwan Moon, Se Hong Oh
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to a data driver and a control method thereof, wherein a position of pixels to which pixel data is written and the amount of change in grayscale of the pixel data are judged, and a bias current to an output buffer from which a data voltage corresponding to the pixel data is output is varied according to the position of pixels and the amount of change in grayscale of the pixel data.
Claims19
A data driver comprising:
- an output buffer configured to output a data voltage corresponding to pixel data;
- and
- a bias current coordinator configured to coordinate a bias current applied to the output buffer according to a final bias current value obtained by multiplying a default current value by a position-based bias current value and a grayscale difference-based bias current value, wherein the default current value is applied to all pixels at the same value, the position-based bias current value is varied with a distance between the data driver and a position of pixels, and the grayscale difference-based bias current value is varied with a grayscale difference of the pixel data, and wherein the position of the pixels is based on counting timing signals or counting grayscale difference data input.
A data driver comprising:
- a first latch array configured to latch pixel data;
- a second latch array configured to latch pixel data output from the first latch array;
- a digital-to-analog converter configured to convert the pixel data output from the second latch array to a data voltage;
- an output buffer configured to output the data voltage from the digital-to-analog converter;
- a data comparator connected to the first latch array and the second latch array and configured to compare first pixel data stored in the first latch array and second pixel data stored in the second latch array;
- and
- a bias current coordinator connected between the data comparator and the output buffer and configured to vary a bias current applied to the output buffer according to a final bias current value obtained by multiplying a default current value by a position-based bias current value and a grayscale difference-based bias current value, wherein the default current value is applied to all pixels at the same value, the position-based bias current value is varied with a distance between the data driver and a position of pixels, and the grayscale difference-based bias current value is varied with a grayscale difference of the pixel data, and wherein the position of the pixels is based on counting timing signals or counting grayscale difference data input.
4 more elements
A control method of a data driver comprising:
- judging a position-based bias current value configured to be varied with a distance between a data driver and a position of pixels to which pixel data is written;
- judging a grayscale difference-based bias current value configured to be varied with a grayscale difference of the pixel data;
- determining a final bias current value by multiplying a default current value by the position-based bias current value and the grayscale difference-based bias current value;
- and
- varying a bias current to an output buffer from which a data voltage corresponding to the pixel data is output according to the final bias current value, wherein the position of the pixels is based on counting timing signals or counting grayscale difference data input.
2 more elements
Dependencies are inferred from the claim text.