Liquid crystal display device
View Patent ↗A liquid crystal display device which can enhance optical transmissivity is provided. One pixel region is divided into a first pixel region, a second pixel region and a third pixel region in order from one video signal line to another video signal line, the first pixel region and the third pixel region adopt the so-called IPS-Pro type structure, and the second pixel region adopts the so-called IPS structure in narrow meaning. A line width of linear electrode in the second pixel region is set to 2.5 μm or less.
1. A liquid crystal display device comprising:
a first substrate;
a second substrate; and
a liquid crystal layer sandwiched between the first substrate and the second substrate, wherein
the first substrate includes a plurality of scanning signal lines; a plurality of video signal lines which intersects the plurality of scanning signal lines, a first insulation film which is formed above the video signal lines, a counter electrode which is formed above the first insulation film, a second insulation film which is formed above the counter electrode, and a pixel electrode which is formed above the second insulation film and to which a video signal is supplied from the video signal line via a switching element,
the liquid crystal layer is configured to be driven by an electric field generated due to difference in potential between the pixel electrode and the counter electrode,
the video signal line is covered with the counter electrode by way of the first insulation film, and
one pixel region sandwiched between two video signal lines arranged adjacent to each other is divided into a first pixel region, a second pixel region and a third pixel region in order from one video signal line to another video signal line, wherein
in the first pixel region and the third pixel region, the pixel electrode has a linear pixel electrode and has a line width of 4.0 μm or less and overlaps with the counter electrode by way of the second insulation film, and the counter electrode is provided in a projecting manner on both sides of the linear pixel electrode as viewed in a plan view, and
in the second pixel region, the pixel electrode has a linear pixel electrode and has a line width of 2.5 μm or less and does not overlap with the counter electrode, and the pixel electrode and the counter electrode are alternately arranged to in a spaced-apart manner from each other in a plan view.
2. A liquid crystal display device according to claim 1 , wherein the pixel electrode has a line width of 2.0 μm or less in the second pixel region.
3. A liquid crystal display device according to claim 1 , wherein the pixel electrode has a plurality of linear pixel electrodes within said one second pixel region, and
the counter electrode has a plurality of linear counter electrodes within the second pixel region, wherein a line width of the linear counter electrode is set to 2.5 μm or less and the number of linear counter electrodes is set smaller than the number of plurality of linear pixel electrodes by one.
4. A liquid crystal display device according to claim 3 , wherein the linear counter electrode has a line width of 2.0 μm or less in the second pixel region.
5. A liquid crystal display device according to claim 1 , wherein the pixel electrode has only one linear pixel electrode within said one second pixel region, and
the counter electrode in the first pixel region and the counter electrode in the third pixel region also function as the counter electrode in the second pixel region.
6. A liquid crystal display device according to claim 1 , wherein assuming two pixel regions arranged adjacent to each other while sandwiching the video signal line therebetween as one pixel region and another pixel region, the counter electrode is shared in common by said one pixel region and said another pixel region.
7. A liquid crystal display device according to claim 1 , wherein each one of the counter electrode and the pixel electrode respectively has a bent portion at a part of a portion thereof which extends in the running direction of the video signal line.
8. A liquid crystal display device comprising:
a first substrate;
a second substrate; and
a liquid crystal layer sandwiched between the first substrate and the second substrate, wherein
the first substrate includes a plurality of scanning signal lines; a plurality of video signal lines which intersects the plurality of scanning signal lines, a first insulation film which is formed above the video signal lines, a counter electrode which is formed above the first insulation film, a second insulation film which is formed above the counter electrode, and a pixel electrode which is formed above the second insulation film and to which a video signal is supplied from the video signal line via a switching element,
the liquid crystal layer is configured to be driven by an electric field generated due to difference in potential between the pixel electrode and the counter electrode,
the counter electrode includes a first counter electrode which extends in the running direction of the video signal line, has a width larger than a width of the video signal line, and covers the video signal line by way of the first insulation film,
the pixel electrode includes, within one pixel region, two first pixel electrodes which extend in the running direction of the video signal line, and one or a plurality of second pixel electrodes which is arranged between the two first pixel electrodes and extends in the running direction of the video signal line, and
assuming the two first counter electrodes arranged adjacent to each other as one first counter electrode and another first counter electrode respectively and assuming the two first pixel electrodes as one first pixel electrode and another first pixel electrode,
said one first pixel electrode overlaps with said one first counter electrode by way of the second insulation film,
said another first pixel electrode overlaps with said another first counter electrode by way of the second insulation film,
the second pixel electrode is arranged between said one first counter electrode and said another first counter electrode such that the second pixel electrode does not overlap with the counter electrode,
an end portion of said one first counter electrode is positioned between said one first pixel electrode and said second pixel electrode, and an end portion of said another first counter electrode is positioned between said another first pixel electrode and said second pixel electrode as viewed in a plan view, and
the first pixel electrode is linearly formed and has a line width of 4.0 μm or less, and the second pixel electrode is linearly formed and has a line width of 2.5 μm or less.
9. A liquid crystal display device according to claim 8 , wherein the line width of the second pixel electrode is set to 2.0 μm or less.
10. A liquid crystal display device according to claim 8 , wherein the pixel electrode has the plurality of second pixel electrodes within said one pixel region,
the counter electrode has one or a plurality of second counter electrodes which extends in the running direction of the video signal line between said one first counter electrode and said another first counter electrode,
the second pixel electrode and the second counter electrode are alternately arranged while preventing the second pixel electrode and the second counter electrode from overlapping with each other, and
the second counter electrode is formed linearly and has a line width of 2.5 μm or less.
11. A liquid crystal display device according to claim 10 , wherein the line width of the second counter electrode is set to 2.0 μm or less.
12. A liquid crystal display device according to claim 8 , wherein the pixel electrode has only one second pixel electrode within said one second pixel region.
13. A liquid crystal display device according to claim 8 , wherein assuming two pixel regions arranged adjacent to each other while sandwiching the video signal line therebetween as one pixel region and another pixel region, the first counter electrode is shared in common by said one pixel region and said another pixel region.
14. A liquid crystal display device according to claim 8 , wherein each one of the counter electrode and the pixel electrode respectively has a bent portion at a part of a portion thereof which extends in the running direction of the video signal line.