Liquid crystal display device having a strip-shaped electrode
A liquid crystal display device includes an array substrate including a pixel electrode which is disposed in each of pixels, a counter-substrate which is disposed to be opposed to the array substrate and includes a counter-electrode which is common to a plurality of the pixels, and a liquid crystal layer which is held between the array substrate and the counter-substrate. The pixel electrode includes a first major electrode portion having a strip shape, and the counter-electrode includes second major electrode portions each having a strip shape, the second major electrode portions being disposed in parallel to the first major electrode portion in a manner that the first major electrode portion is interposed between the second major electrode portions and that the first major electrode portion and the second major electrode portions are alternately arranged.
1. A liquid crystal display device comprising:
an array substrate comprising a storage capacitance line extended in a row direction and a pixel electrode which is disposed in each of pixels, the pixel electrode comprising a first major electrode portion having a strip shape extended in a column direction and a first sub-electrode portion which is positioned above the storage capacitance line and is electrically connected to the first major electrode portion;
a counter-substrate which is disposed to be opposed to the array substrate and comprises a counter-electrode which is common to a plurality of the pixels, the counter-electrode comprising second major electrode portions each having a strip shape; and
a liquid crystal layer which is held between the array substrate and the counter-substrate,
wherein:
the second major electrode portions are disposed in parallel to the first major electrode portion in a manner that the first major electrode portion is interposed between the second major electrode portions; and
the first sub-electrode portion includes a first oblique side and a second oblique side which are each extended in a direction different from the row direction and the column direction.
2. The liquid crystal display device according to claim 1 , wherein:
the array substrate further comprises signal lines which are disposed along the column direction; and
the first sub-electrode portion is disposed equidistant from two signal lines which sandwich the first sub-electrode portion.
3. The liquid crystal display device according to claim 1 , wherein the first oblique side and the second oblique side are symmetric with respect to the center line that is parallel to the column direction.
4. The liquid crystal display device according to claim 1 , wherein:
the array substrate further comprises a first alignment film covering the pixel electrode;
the counter-substrate further comprises a second alignment film covering the counter-electrode; and
a first rubbing direction of the first alignment film and a second rubbing direction of the second alignment film are parallel to the column direction.
5. The liquid crystal display device according to claim 1 , wherein:
the array substrate further comprises a first signal line and a second signal line which are positioned on both sides of the pixel electrode and are each disposed along the column direction;
the first oblique side comprises a first end portion being opposed to the first signal line at a first distance on a side of the first major electrode portion, and a second end portion being opposed to the first signal line at a second distance which is shorter than the first distance on an opposite side of the first end portion; and
the second oblique side comprises a third end portion being opposed to the second signal line at a third distance on the side of the first major electrode portion, and a fourth end portion being opposed to the second signal line at a forth distance which is shorter than the third distance on an opposite side of the third end portion.
6. The liquid crystal display device according to claim 1 , wherein a distance between the first major electrode portion and the second major electrode portion is greater than a thickness of the liquid crystal layer.
7. A liquid crystal display device, comprising:
an array substrate comprising a pixel electrode disposed in each of pixels, a signal line disposed along a column direction of each of the pixels, and a first alignment film covering the pixel electrode;
a counter-substrate comprising a counter-electrode which is disposed to be opposed to the array substrate and is common to a plurality of the pixels, and a second alignment film covering the counter-electrode; and
a liquid crystal layer including a liquid crystal molecule which is held between the array substrate and the counter-substrate,
wherein:
the pixel electrode comprises a first major electrode portion having a strip shape and a first sub-electrode portion connected to the first major electrode portion;
the counter-electrode comprises second major electrode portions which are opposed to the signal line and are disposed in parallel to the first major electrode portion in a manner that the first major electrode portion is interposed between the second major electrode portions;
the first sub-electrode portion includes a first oblique side and a second oblique side which are each extended in a direction different from the row direction and the column direction;
in an initially alignment state in which an electric field is not formed between the pixel electrode and the counter-electrode, a major-axis of the liquid crystal molecule is aligned in a direction parallel to the first major electrode portion; and
a distance between the first major electrode portion and the second major electrode portion is greater than a gap between the array substrate and the counter-substrate.
8. The liquid crystal display device according to claim 7 , wherein the neighboring second major electrode portions sandwich the first major electrode portion, and are disposed at a substantially equidistant position from the first major electrode portion.
9. The liquid crystal display device according to claim 8 , wherein the counter-electrode further comprises a second sub-electrode portion which is opposed to the first sub-electrode portion and is electrically connected to the second major electrode portion.
10. The liquid crystal display device according to claim 7 , wherein the first major electrode portion and the second major electrode portion are formed of a light-transmissive, electrically conductive material.
11. A liquid crystal display device, comprising:
an array substrate comprising a pixel electrode disposed in each of pixels, a signal line disposed along a column direction of each of the pixels, a scanning line disposed along a row direction of each of the pixels, a storage capacitance line disposed in parallel to the scanning line, and a first alignment film covering the pixel electrode;
a counter-substrate comprising a counter-electrode which is disposed to be opposed to the array substrate and is common to a plurality of the pixels, and a second alignment film covering the counter-electrode:
a liquid crystal layer including a liquid crystal molecule which is held between the array substrate and the counter-substrate; and
a pair of polarizer plates disposed on each outer surface of the array substrate and the counter-substrate,
wherein:
the pixel electrode comprises a first major electrode portion having a strip shape, and a first sub-electrode portion which is positioned above the storage capacitance line and is connected to the first major electrode portion;
the counter-electrode comprises second major electrode portions which are opposed to the signal line and are disposed in parallel to the first major electrode portion in a manner that the first major electrode portion is interposed between the second major electrode portions;
the first sub-electrode portion has an edge extended in an oblique direction with respect to a row direction;
in an initially alignment state in which an electric field is not formed between the pixel electrode and the counter-electrode, a major-axis of the liquid crystal molecule is aligned in a direction parallel to the first major electrode portion; and
a distance between the first major electrode portion and the second major electrode portion is greater than a gap between the array substrate and the counter-substrate.
12. The liquid crystal display device according to claim 11 , wherein the neighboring second major electrode portions sandwich the first major electrode portion and are disposed at a substantially equidistant position from the first major electrode portion.
13. The liquid crystal display device according to claim 11 , wherein the first sub-electrode portion has a trapezoidal shape.
14. The liquid crystal display device according to claim 11 , wherein the counter-electrode further comprises a second sub-electrode portion which is opposed to the first sub-electrode portion and is electrically connected to the second major electrode portion.
15. The liquid crystal display device according to claim 11 , wherein the first major electrode portion and the second major electrode portion are formed of a light-transmissive, electrically conductive material.
16. The liquid crystal display device according to claim 11 , wherein a normally black mode is adopted.