Liquid crystal display device
View Patent ↗A column for defining the interval between a TFT substrate and an opposed substrate is formed at a crossing point between a drain line and a scanning line. At the crossing point where the column is formed, the drain line is formed to have a wider width to prevent light leakage. Further, at the crossing point where the column is formed, the scanning line is formed to have a narrower width to prevent increase of capacitance between the drain line and the scanning line. The column is formed at a crossing point corresponding to a specific color, e.g., a blue pixel B, so that a difference in transmittance and in characteristic of thin film transistors due to formation of the column is initially compensated.
1. A liquid crystal display device comprising:
scanning lines;
drain lines which include a first drain line and a second drain line which is next to the first drain line;
a TFT substrate;
an opposed substrate placed with a predetermined interval with respect to the TFT substrate; and
liquid crystal enclosed between the TFT substrate and the opposed substrate, wherein
the first drain line includes, at a crossing point between the first drain line and one of the scanning lines, a wider portion which is wider than other portions of the first drain line, and
the one of the scanning lines includes, at the crossing point between the one of the scanning lines and the first drain line, a narrower portion which is narrower than other portions of the one of the scanning lines,
the TFT substrate includes pixels having TFTs and pixel electrodes, the TFTs including:
a first TFT formed at the crossing point between the first drain line and the one of the scanning lines, and
a second TFT formed at a position adjacent to the crossing point between the first drain line and the one of the scanning lines, wherein
the first TFT and the second TFT are electrically connected to each other and are electrically connected to the one of the scanning lines, and
the first TFT is electrically connected to the first drain line at a position except for the crossing point between the first drain line and the one of the scanning lines, wherein
the second drain line does not include the wider portion at a crossing point between the second drain line and the one of the scanning lines.
2. The liquid crystal display device according to claim 1 , further comprising
a column for defining the interval between the TFT substrate and the opposed substrate formed at the crossing point between the first drain line and the one of the scanning lines.
3. The liquid crystal display device according to claim 2 , wherein the column lies on the TFT substrate.
4. The liquid crystal display device according to claim 1 , wherein the pixels include a blue pixel and a red pixel, and the crossing point is placed between the blue pixel and the red pixel.
5. The liquid crystal display device according to claim 4 , further comprising
a column for defining the interval between the TFT substrate and the opposed substrate formed at the crossing point between the first drain line and the one of the scanning lines.
6. The liquid crystal display device according to claim 5 , wherein the column lies on the TFT substrate.
7. The liquid crystal display device according to claim 2 , wherein the liquid crystal display device is an In Plane Switching type.
8. The liquid crystal display device according to claim 7 , wherein a width of the scanning line at the first TFT is narrower than a width of the scanning line at the second TFT.
9. The liquid crystal display device according to claim 4 , wherein the liquid crystal display device is an In Plane Switching type.
10. The liquid crystal display device according to claim 9 , wherein the width of the scanning line at the first TFT is narrower than the width of the scanning line at the second TFT.
11. The liquid crystal display device according to claim 1 , the first drain line is provided at every three drain line.
12. The liquid crystal display device according to claim 1 , further comprising
pixels which has a first color, and pixels which has a second color,
the drain lines include a plurality of first drain lines, and a plurality of second drain lines,
the plurality of first drain lines are connected to the pixels which has the first color,
the plurality of second drain lines are connected to the pixels which has the second color.
13. The liquid crystal display device according to claim 1 the one of the scanning lines does not include the narrower portion at the crossing point between the one of the scanning lines and the second drain line.
14. A liquid crystal display device comprising:
scanning lines;
drain lines which include a first drain line and a second drain line which is next to the first drain line;
a TFT substrate;
an opposed substrate placed with a predetermined interval with respect to the TFT substrate, and liquid crystal enclosed between the TFT substrate and the opposed substrate, wherein
the first drain line includes, at a crossing point between the first drain line and one of the scanning lines, a narrower portion which is narrower than other portions of the first drain line, and
a width of the one of the scanning lines includes, at the crossing point between the one of the scanning lines and the first drain line, a wider portion which is wider than at other portions of the one of the scanning lines,
the TFT substrate includes pixels having TFTs and pixel electrodes, the TFTs including:
a first TFT formed at the crossing point between the first drain line and the one of the scanning lines, and
a second TFT formed at a position adjacent to the crossing point between the first drain line and the one of the scanning lines, wherein
the first TFT and the second TFT are electrically connected to each other and electrically connected to the one of the scanning lines,
the first TFT is electrically connected to the first drain line at a position except for the crossing point between the first drain line and the one of the scanning lines, and
the second drain line does not include the narrower portion at a crossing point between the second drain line and the one of the scanning lines.
15. The liquid crystal display device according to claim 14 , further comprising
a column for defining the interval between the TFT substrate and the opposed substrate formed at the crossing point between the first drain line and the one of the scanning lines.
16. The liquid crystal display device according to claim 15 , wherein the column lies on the TFT substrate.
17. The liquid crystal display device according to claim 14 , wherein the pixels include a blue pixel and a red pixel, and the crossing point is placed between the blue pixel and the red pixel.
18. The liquid crystal display device according to claim 17 , further comprising
a column for defining the interval between the TFT substrate and the opposed substrate formed at the crossing point between the first drain line and the one of the scanning lines.
19. The liquid crystal display device according to claim 18 , wherein the column lies on the TFT substrate.
20. The liquid crystal display device according to claim 15 , wherein the liquid crystal display device is an In Plane Switching type.
21. The liquid crystal display device according to claim 20 , wherein the width of the scanning line at the first TFT is wider than the width of the scanning line at the second TFT.
22. The liquid crystal display device according to claim 17 , wherein the liquid crystal display device is an In Plane Switching type.
23. The liquid crystal display device according to claim 22 , wherein a width of the scanning line at the first TFT is wider than a width of the scanning line at the second TFT.
24. The liquid crystal display device according to claim 14 , the first drain line is provided at every three drain line.
25. The liquid crystal display device according to claim 14 , further comprising
pixels which has a first color, and pixels which has a second color, the drain lines include a plurality of first drain lines, and a plurality of second drain lines,
the plurality of first drain lines are connected to the pixels which has the first color,
the plurality of second drain lines are connected to the pixels which has the second color.
26. The liquid crystal display device according to claim 14 , the one of the scanning lines does not include the wider portion at the crossing point between the one of the scanning lines and the second drain line.