Method and apparatus for driving liquid crystal display
View Patent ↗The present invention discloses a method and apparatus for driving a liquid crystal display device preventing a deterioration of picture quality. More specifically, in the method and apparatus, a difference between modulated data and normal input data is calculated, and the normal input data are modulated by using the difference data calculated.
1. A method of driving a liquid crystal display, comprising steps of:
setting a modulation data in the liquid crystal display;
receiving an input data;
delaying the input data;
modulating the input data using the modulation data in accordance with the input data and the delayed input data;
adding the modulated data to the input data;
subtracting the modulated data from the input data;
comparing the delayed input data with the input data; and
selecting one of the added data and the subtracted data depending on the compared result.
2. A method of driving a liquid crystal display, comprising steps of:
receiving an input data;
dividing the input data into most significant bits and least significant bits;
delaying the most significant bits for a frame period;
modulating the most significant bits using the modulation data in accordance with the most significant bits and the delayed most significant bits;
adding the modulated data to the non-delayed most significant bits;
subtracting the modulated data from the non-delayed most significant bits;
comparing the delayed most significant bits with the non-delayed most significant bits; and
selecting one of the added data and the subtracted data depending on the compared result.
3. The method according to claim 2 , further comprising:
combining the selected data with the least significant bits.
4. A method of driving a liquid crystal display, comprising:
determining a data for driving video data normally;
determining an output data for displaying on the liquid crystal display;
acquiring a modulation data by calculating differences between the normal data and the output data;
storing the modulation data in the liquid crystal display; and
receiving an input data;
dividing the input data into most significant bits and least significant bits;
delaying the most significant bits for a frame period;
modulating the most significant bits using the modulation data in accordance with the most significant bits and the delayed most significant bits;
adding the modulated data to the non-delayed most significant bits;
subtracting the modulated data from the non-delayed most significant bits;
comparing the delayed most significant bits with the non-delayed most significant bits; and
selecting one of the added data and the subtracted data depending on the compared result.
5. The method according to claim 4 , further comprising:
combining the selected data with the least significant bits.
6. A driving apparatus for a liquid crystal display, comprising:
an input line receiving an input data;
a frame memory delaying the input data;
a modulator modulating the input data using the delayed input data;
an adder adding the modulated data to the input data;
a subtracter subtracting the modulated data from the input data;
a comparator comparing the input data with the delayed input data for a frame period; and
a selector selecting one of the added data and the subtracted data depending on the compared result from the comparator.
7. A driving apparatus for a liquid crystal display, comprising:
an input line receiving an input data;
a frame memory delaying most significant bits of the input data;
a modulator modulating the most significant bits using the delayed most significant bits and the non-delayed most significant bits;
an adder adding the modulated data to the non-delayed most significant bits;
a subtracter subtracting the modulated data from the non-delayed most significant bits;
a comparator comparing the non-delayed most significant bits with the delayed most significant bits; and
a selector selecting one of the added data and the subtracted data depending on the compared result from the comparator.
8. The driving apparatus according to claim 7 , further comprising a combiner combining the selected data with the input data.
9. A driving apparatus for a liquid crystal display, comprising:
a modulator storing a modulation data predetermined by calculating differences between a data for driving video data normally and an output data for displaying on the liquid crystal display;
an input line receiving an input data;
a frame memory delaying most significant bits of the input data;
an adder adding a modulated data acquired by the modulator using the non-delayed most significant bits and the delayed most significant bits to the non-delayed most significant bits;
a subtracter subtracting the modulated data from the non-delayed most significant bits;
a comparator comparing the delayed most significant bits with the non-delayed most significant bits; and
a selector selecting one of the added data and the subtracted data depending on the compared result.
10. The driving apparatus according to claim 9 , further comprising a combiner combining the selected data with the input data.