Method and apparatus for driving liquid crystal display
First Claim
1. A driving apparatus for a liquid crystal display, comprising:
- image signal modulating means for partially expanding or reducing contrast of input data to generate output data; and
a timing controller for re-arranging the output data to apply the output data to a data driver;
wherein the image signal modulating means includes;
a brightness/color separator for converting the input data into brightness components and chrominance components;
an entire area statistics part for dividing the brightness components for one frame into gray levels of the frame to generate an entire histogram;
a partial area statistics part for dividing the brightness components one of the frame into i areas (wherein i is an integer) and for generating i partial histograms using brightness components in each divided area;
an effective selector for comparing partial average values of the partial histograms with an entire average value of the entire histogram to select at least two effective areas of the i areas;
a brightness distribution calculator for summing partial histograms in the effective area to generate a new histogram; and
a data processor for generating modulated brightness components having a partially expanded and reduced contrast using the new histogram.
2 Assignments
0 Petitions
Accused Products
Abstract
A driving method and apparatus for a liquid crystal display capable of selectively emphasizing a contrast is disclosed. In the apparatus, an image signal modulator partially expands or reduces the contrast of input data to generate output data. The brightness components for one frame are divided into a plurality of areas and an area having a large brightness difference is removed from each area to thereby produce new data. Gray levels of the new data are divided into a plurality of regions of different slopes. The range of output gray levels is enlarged in proportion to the slopes, thereby partially emphasizing the contrast ratio. A timing controller re-arranges the output data to apply it to a data driver.
30 Citations
37 Claims
-
1. A driving apparatus for a liquid crystal display, comprising:
-
image signal modulating means for partially expanding or reducing contrast of input data to generate output data; and a timing controller for re-arranging the output data to apply the output data to a data driver; wherein the image signal modulating means includes; a brightness/color separator for converting the input data into brightness components and chrominance components; an entire area statistics part for dividing the brightness components for one frame into gray levels of the frame to generate an entire histogram; a partial area statistics part for dividing the brightness components one of the frame into i areas (wherein i is an integer) and for generating i partial histograms using brightness components in each divided area; an effective selector for comparing partial average values of the partial histograms with an entire average value of the entire histogram to select at least two effective areas of the i areas; a brightness distribution calculator for summing partial histograms in the effective area to generate a new histogram; and a data processor for generating modulated brightness components having a partially expanded and reduced contrast using the new histogram. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method of driving a liquid crystal display, the method comprising:
-
partially expanding or reducing contrast of input data to generate output data; and re-arranging the output data to apply the output data to a data driver; wherein generating the output data includes; converting the input data into brightness components and chrominance components; dividing brightness components for one frame into gray levels to generate an entire histogram; dividing the brightness components into i areas (wherein i is an integer) and generating i partial histograms using the brightness components in each divided area; comparing partial average values of the partial histograms with an entire average value of the entire histogram to select at least two effective areas of the i areas; summing the partial histograms in each effective area to generate a new histogram; and generating modulated brightness components having a partially expanded and reduced contrast using the new histogram. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
-
-
25. A method of driving a liquid crystal display, the method comprising:
-
separating an entire area of the liquid crystal display into a plurality of individual areas; extracting brightness components of one frame from input data to be supplied to the liquid crystal display for the entire area and for the individual areas; determining an average of the brightness components in the entire area and averages of the brightness components in the individual areas; comparing the average values of the individual areas with the average value of the entire area; modifying the brightness components of the individual areas differently dependent on whether or not the averages of the brightness components in the individual areas are within a predetermined deviation from the average of the brightness components in the entire area to produce modulated brightness components; generating output data using the modulated brightness components instead of the brightness components; and supplying the output data to the liquid crystal display. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
-
Specification