Twisted nematic liquid crystal display device
View Patent ↗A twisted nematic liquid crystal display device includes a first substrate, a plurality of gate lines and a plurality of data lines formed on the first substrate, a plurality of pixels connected to the gate lines and the data lines and each pixel having a first subpixel and a second subpixel, a first subpixel electrode formed in the first subpixel, and a second subpixel electrode formed in the second subpixel. The voltage of the first subpixel electrode is greater than the voltage of the second subpixel electrode, and a ratio of the area of the second subpixel electrode to the area of the first subpixel electrode is in the range of 0.66 to 1.5.
1. A twisted nematic liquid crystal display device, comprising:
a first substrate;
a plurality of gate lines and a plurality of data lines formed on the first substrate;
a plurality of pixels connected with the gate lines and the data lines, and each pixel comprising a first subpixel and a second subpixel;
a first subpixel electrode formed in the first subpixel;
a second subpixel electrode formed in the second subpixel;
a switching element connected with a gate line of the gate lines and a data line of the data lines;
a first liquid crystal capacitor and a first storage capacitor connected with the switching element and formed in the first subpixel;
a second liquid crystal capacitor and a second storage capacitor connected with the switching element and formed in the second subpixel; and
an auxiliary capacitor formed between the switching element and the second liquid crystal capacitor,
wherein a voltage of the first subpixel electrode is greater than a voltage of the second subpixel electrode, and
a ratio of an area of the second subpixel electrode to an area of the first subpixel electrode is in a range of about 0.66 to about 1.5.
2. The twisted nematic liquid crystal display device of claim 1 , wherein:
the area of the first subpixel electrode is equal to that of the second subpixel electrode.
3. The twisted nematic liquid crystal display device of claim 1 , wherein:
a ratio of a capacitance of the auxiliary capacitor to a capacitance of the first storage capacitor is in a range of about 0.4 to about 1.
4. The twisted nematic liquid crystal display device of claim 1 , further comprising:
a second substrate facing the first substrate; and
a liquid crystal layer formed between the first substrate and the second substrate,
wherein the liquid crystal layer comprises liquid crystals having a driving voltage in a range of about 2.5 to about 4V.
5. The twisted nematic liquid crystal display device of claim 1 , further comprising:
a second substrate facing the first substrate;
a discotic liquid crystallayer formed on outer surfaces of the first substrate and the second substrate;
a tri acetyl cellulous layer formed on an outer surface of the discotic liquid crystal layer; and
a poly vinyl alcohol layer formed on the outer surface of the tri acetyl cellulous layer.
6. The twisted nematic liquid crystal display device of claim 5 , wherein:
a retardation in a thickness direction of the discotic liquid crystal layer is in a range of about 150 nm to about 180 nm,
an average inclination angle of the discotic liquid crystal layer is in a range of about 45 degrees to about 50 degrees, and
a retardation in a thickness direction of the tri acetyl cellulous layer is in a range of about 70 nm to about 100 nm.
7. The twisted nematic liquid crystal display device of claim 5 , further comprising:
a compensation film formed by at least one of a biaxial film, an A-plate, and a C-plate formed on the outer surface of the poly vinyl alcohol layer,
wherein a retardation of the compensation film is in a range of about 70 nm to about 150 nm.
8. The twisted nematic liquid crystal display device of claim 6 , further comprising:
a compensation film formed by at least of a biaxial film, an A-plate, and a C-plate formed on an outer surface of the poly vinyl alcohol a layer,
wherein a retardation of the compensation film is in a range of about 55 nm to about 70 nm.
9. The twisted nematic liquid crystal display device of claim 5 , further comprising:
a polarizer pattern formed in the second subpixel on an inner surface of at least one of the first substrate and the second substrate,
wherein a retardation of the polarizer pattern is in a range of about 70 nm to about 150 nm.
10. The twisted nematic liquid crystal display device of claim 6 , further comprising:
a polarizer pattern formed in the second subpixel on an inner surface of at least one of the first substrate and the second substrate,
wherein a retardation of the polarizer pattern is in a range of about 55 nm to about 70 nm.
11. The twisted nematic liquid crystal display device of claim 5 , further comprising:
a compensation film formed by at least one of a biaxial film, an A-plate, and a C-plate formed on an outer surface of the poly vinyl alcohol layer; and
a polarizer patternformed in the second subpixel on an inner surface of at least one of the first substrate and the second substrate,
wherein a retardation of the compensation film is in a range of about 55 nm to about 100 nm, and
a retardation of the polarizer pattern is in a range of about 55 nm to about 70nm.
12. The twisted nematic liquid crystal display device of claim 1 , further comprising:
a polarizer pattern formed in the second subpixel on an inner surface of at least one of the first substrate and the second substrate,
wherein a retardation of the polarizer pattern is in a range of about 70 nm to about 150 nm.
13. The twisted nematic liquid crystal display device of claim 12 , wherein:
the polarizer pattern is in a C-plate pattern.
14. A twisted nematic liquid crystal display device, comprising:
a first substrate;
a plurality of gate lines and a plurality of data lines formed on the first substrate;
a plurality of pixels connected with the gate lines and the data lines, and each pixel comprising a first subpixel and a second subpixel;
a first subpixel electrode formed in the first subpixel;
a second subpixel electrode formed in the second subpixel;
a first switching element and a second switching element connected with a gate line of the gate lines and a data line of the data lines;
a first liquid crystal capacitor and a first storage capacitor connected with the first switching element and formed in the first subpixel;
a second liquid crystal capacitor and a second storage capacitor connected with the second switching element and formed in the second subpixel;
a third switching element connected with the second switching element and switched by a subsequent gate line of the gate line connected with the first switching element; and
an auxiliary capacitor connected with the third switching element,
wherein a ratio of a capacitance of the auxiliary capacitor to a capacitance of the first storage capacitor is in a range of about 0.4 to about 1.
15. A twisted nematic liquid crystal display device, comprising:
a first substrate;
a plurality of gate lines and a plurality of data lines formed on the first substrate;
a plurality of pixels connected with the gate lines and the data lines, and each pixel comprising a first subpixel and a second subpixel;
a first subpixel electrode formed in the first subpixel;
a second subpixel electrode formed in the second subpixel;
a plurality of storage electrode lines;
a first switching element and a second switching element connected with a gate line of the gate lines and a data line of the data lines;
a first liquid crystal capacitor and a first storage capacitor connected with the first switching element and formed in the first subpixel;
a second liquid crystal capacitor and a second storage capacitor connected with the second switching element and formed in the second subpixel;
a third switching element connected with the gate line and the storage electrode line;
an auxiliary capacitor formed between the first switching element and the third switching element; and
a fourth switching element connected with the second switching element and the third switching element and switched by a subsequent gate line of a gate line connected with the first, second and third switching elements,
wherein a ratio of the capacitance of the auxiliary capacitor to a capacitance of the first storage capacitor is in a range of about 0.4 to about 1.
16. A twisted nematic liquid crystal display device, comprising:
a first substrate;
a plurality of gate lines and a plurality of data lines formed on the first substrate;
a plurality of pixels connected with the gate lines and the data lines, and each pixel comprising a first subpixel and a second subpixel;
a first subpixel electrode formed in the first subpixel;
a second subpixel electrode formed in the second subpixel;
a plurality of storage electrode lines;
a first switching element and a second switching element connected with a gate line of the gate lines and a data line of the data lines;
a first liquid crystal capacitor and a first storage capacitor connected with the first switching element;
a second liquid crystal capacitor and a second storage capacitor connected with the second switching element;
a third switching element including an input terminal connected to the second switching element, a control terminal which is floated, and an output terminal; and
an auxiliary capacitor connected with the third switching element and the storage electrode line.
17. The twisted nematic liquid crystal display device of claim 16 , wherein:
a ratio of the capacitance of the auxiliary capacitor to a capacitance of the first storage capacitor is in a range of about 0.4 to about 1.