LIQUID CRYSTAL DISPLAY DEVICE, DRIVING CONTROL CIRCUIT AND DRIVING METHOD USED IN SAME

Abstract

A liquid crystal display device is provided which is capable of improving quality of moving images. A field dividing driving operation is performed in which an odd field during which each of scanning electrodes in odd-numbered rows is sequentially driven and an even field during which each of scanning electrodes in even-numbered rows is sequentially driven occur, alternately and repeatedly, with time width of a refresh rate. In the former half of the odd field, display data is written in each of pixel regions corresponding to scanning electrodes in odd-numbered rows and, in the latter half of the odd field, black data is written in each of the pixel regions corresponding to scanning electrodes in the odd-numbered rows. In the former half of the even field, display data is written in each of pixel regions corresponding to scanning electrodes in the even-numbered rows and, in the latter half of the even field, black data is written in each of pixel regions corresponding to scanning electrodes in the even-numbered rows.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, advantages, and features of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a block diagram showing electrical configurations of main components of a liquid crystal display device according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram showing one example of electrical configurations of a liquid crystal display panel of FIG. 1;

FIG. 3 is a diagram schematically showing configurations of the liquid crystal display panel and a position of a backlight of FIG. 1;

FIG. 4 is a time chart explaining operations of the liquid crystal display device of FIG. 1:

FIG. 5 is a diagram explaining an inversion of a voltage of data to be written in each of pixel regions of FIG. 2;

FIG. 6 is a diagram of a waveform of a signal of each component explaining operations of the liquid crystal display device of FIG. 1;

FIG. 7 is a diagram explaining another example of the inversion of a voltage of data to be written in each of the pixel regions of FIG. 2;

FIG. 8 is a diagram explaining still another example of the inversion of a voltage of data to be written in each of the pixel regions of FIG. 2;

FIG. 9 is a diagram explaining yet another example of the inversion of a voltage of data to be written in each of the pixel regions of FIG. 2;

FIG. 10 is a diagram explaining an example of biasing of polarity of a voltage of data to be written in each of the pixel regions of FIG. 2;

FIG. 11 is a time chart explaining operations of a liquid crystal display device according to a second embodiment of the present invention;

FIG. 12 is a diagram explaining an inversion of polarity of a voltage of data to be written in each of pixel regions according to the second embodiment;

FIG. 13 is a waveform diagram explaining operations of the liquid crystal display device of the second embodiment of the present invention;

FIG. 14 is a diagram showing another example of the inversion of the polarity of a voltage of data to be written in each of the pixel regions according to the second embodiment of the present invention;

FIG. 15 is a diagram showing still another example of the inversion of the polarity of a voltage of data to be written in each of the pixel regions according to the second embodiment of the present invention;

FIG. 16 is a diagram showing yet another example of the inversion of the polarity of a voltage of data to be written in each of the pixel regions according to the second embodiment of the present invention;

FIG. 17 is a time chart explaining a modified example of operations of a liquid crystal display according to a third embodiment of the present invention;

FIG. 18 is a diagram showing electrical configurations of main components of a conventional liquid crystal display device;

FIG. 19 is a time chart explaining operations of the conventional liquid crystal display device of FIG. 18;

FIG. 20 is also a time chart explaining operations of the conventional liquid crystal display device of FIG. 18; and

FIG. 21 is a diagram of a waveform of a signal of each component explaining operations of the conventional liquid crystal display device.

Claims

1. A liquid crystal display device for obtaining displayed images by driving a plurality of rows of scanning electrodes and a plurality of columns of data electrodes, both being arranged so as to be orthogonal to one another, according to an input video signal so that specified display data is written in each pixel region corresponding to a liquid crystal layer, comprising: a driving control circuit to perform a field dividing driving operation by which an odd field during which each of scanning electrodes in odd-numbered rows is sequentially driven and an even field during which each of scanning electrodes in even-numbered rows is sequentially driven occur alternately and repeatedly in every frame period and in which an odd/even field is divided into a first odd/even sub-field and a second odd/even sub-field and, during said first odd/even sub-field, display data corresponding to said input video signal is line-sequentially written in each pixel region and, during said second odd/even sub-field, dark data is line-sequentially written in each said pixel region.

2. The liquid crystal display device according to claim 1, wherein a polarity of a voltage of data to be written in each of pixel regions corresponding to said scanning electrodes in odd-numbered rows is inverted in every odd field and a polarity of a voltage of data to be written in each of pixel regions corresponding to said scanning electrodes in even-numbered rows is inverted in every even field.

3. The liquid crystal display device according to claim 1, wherein said dark data is black data.

4. The liquid crystal display device according to claim 1, wherein, during said odd field, each of said scanning electrodes in odd-numbered rows is successively driven and, simultaneously, each of said scanning electrodes in even-numbered rows existing next to each of scanning electrodes in said odd-numbered rows is driven and wherein, during said even field, each of said scanning electrodes in even-numbered rows is successively driven and, simultaneously, each of said scanning electrodes in odd-numbered rows existing before each of said scanning electrodes in said even-numbered rows is successively driven.

5. The liquid crystal display device according to claim 2, wherein, during said odd field, each of said scanning electrodes in odd-numbered rows is successively driven and, simultaneously, each of said scanning electrodes in even-numbered rows existing next to each of scanning electrodes in said odd-numbered rows is driven and wherein, during said even field, each of said scanning electrodes in even-numbered rows is successively driven and, simultaneously, each of said scanning electrodes in odd-numbered rows existing before each of said scanning electrodes in said even-numbered rows is successively driven.

6. A driving control circuit to be used in a liquid crystal display device for obtaining displayed images by driving a plurality of rows of scanning electrodes and a plurality of columns of data electrodes, both being arranged so as to be orthogonal to one another, according to an input video signal so that specified display data is written in each pixel region corresponding to a liquid crystal layer, the driving control circuit configured: to perform a field dividing driving operation by which an odd field during which each of scanning electrodes in odd-numbered rows is sequentially driven and an even field during which each of scanning electrodes in even-numbered rows is sequentially driven occur alternately and repeatedly in every frame period and in which an odd/even field is divided into a first odd/even sub-field and a second odd/even sub-field and, during said first odd/even sub-field, display data corresponding to said input video signal is line-sequentially written in each pixel region and, during said second odd/even sub-field, dark data is line-sequentially written in each said pixel region.

7. The driving control circuit according to claim 6, wherein a polarity of a voltage of data to be written in each of pixel regions corresponding to said scanning electrodes in odd-numbered rows is inverted in every odd field and a polarity of a voltage of data to be written in each of pixel regions corresponding to said scanning electrodes in even-numbered rows is inverted in every even field.

8. The driving control circuit according to claim 6, wherein said dark data is black data.

9. The driving control circuit according to claim 6, wherein, during said odd field, each of said scanning electrodes in odd-numbered rows is successively driven and, simultaneously, each of said scanning electrodes in even-numbered rows existing next to each of scanning electrodes in said odd-numbered rows is driven and wherein, during said even field, each of said scanning electrodes in even-numbered rows is successively driven and, simultaneously, each of said scanning electrodes in odd-numbered rows existing before each of scanning electrodes in said even-numbered rows is successively driven.

10. The driving control circuit according to claim 7, wherein, during said odd field, each of said scanning electrodes in odd-numbered rows is successively driven and, simultaneously, each of said scanning electrodes in even-numbered rows existing next to each of scanning electrodes in said odd-numbered rows is driven and wherein, during said even field, each of said scanning electrodes in even-numbered rows is successively driven and, simultaneously, each of said scanning electrodes in odd-numbered rows existing before each of scanning electrodes in said even-numbered rows is successively driven.

11. A driving method to be used in a liquid crystal display device for obtaining displayed images by driving a plurality of rows of scanning electrodes and a plurality of columns of data electrodes, both being arranged so as to be orthogonal to one another, according to an input video signal so that specified display data is written in each pixel region corresponding to a liquid crystal layer, comprising: a step of performing a field dividing driving operation by which an odd field during which each of scanning electrodes in odd-numbered rows is sequentially driven and an even field during which each of scanning electrodes in even-numbered rows is sequentially driven occur alternately and repeatedly in every frame period and in which an odd/even field is divided into a first odd/even sub-field and a second odd/even sub-field and, during said first odd/even sub-field, display data corresponding to said input video signal is line-sequentially written in each pixel region and, during said second odd/even sub-field, dark data is line-sequentially written in each said pixel region.

12. The driving method according to claim 11, wherein a polarity of a voltage of data to be written in each of pixel regions corresponding to said scanning electrodes in odd-numbered rows is inverted in every odd field and a polarity of a voltage of data to be written in each of pixel regions corresponding to said scanning electrodes in even-numbered rows is inverted in every even field.

13. The driving method according to claim 11, wherein said dark data is black data.

14. The driving method according to claim 11, wherein, during said odd field, each of said scanning electrodes in odd-numbered rows is successively driven and, simultaneously, each of said scanning electrodes in even-numbered rows existing next to each of scanning electrodes in said odd-numbered rows is driven and wherein, during said even field, each of said scanning electrodes in even-numbered rows is successively driven and, simultaneously, each of said scanning electrodes in odd-numbered rows existing before each of scanning electrodes in said even-numbered rows is successively driven.

15. The driving method according to claim 12, wherein a polarity of a voltage of data to be written in each of pixel regions corresponding to said scanning electrodes in odd-numbered rows is inverted in every odd field and a polarity of a voltage of data to be written in each of pixel regions corresponding to said scanning electrodes in even-numbered rows is inverted in every even field.