Liquid crystal display device
View Patent ↗Light leakage between pixel electrodes over a video signal line in a TN-type liquid crystal display device in which a dot inversion driving is applied with a three o'clock viewing angle is prevented. Pixel electrodes (PX) are formed on both sides of a video signal line (DL) of a first substrate (SUB 1 ), and an end of the pixel electrode (PX) and the video signal line (DL) overlap each other. Over a second substrate (SUB 2 ), a black matrix (BM) is formed in a portion corresponding to the video signal line (DL). By shifting the black matrix BM and the video signal line DL to the left with respect to a gap G between the pixel electrodes PX, it is possible to prevent light leakage caused by a disclination line (DS) which occurs by a horizontal electric field between pixel electrodes (PX).
1. A TN-type liquid crystal display device in which liquid crystal is provided between a first substrate and a second substrate, a rubbing process is applied to the first substrate and the second substrate so that a colorscale inversion does not tend to occur in a three o'clock direction or in a nine o'clock direction, and a dot inversion driving or a column inversion driving is applied, wherein
over the first substrate, video signal lines extend, as a whole, along a first direction which is parallel to a twelve o'clock direction and are arranged in a second direction which is parallel to the three o'clock direction, scan lines extend along the second direction and are arranged in the first direction, and a pixel including a pixel electrode is formed in a region surrounded by the video signal line and the scan line,
the video signal line and the pixel electrode are bent within the pixel, an angle between a side of the bent pixel electrode and the first direction is greater than or equal to 10 degrees and less than or equal to 45 degrees in a clockwise direction on one side of the bent portion and is greater than or equal to 15 degrees and less than or equal to 45 degrees in a counterclockwise direction on the other side of the bent portion when the liquid crystal is twisted in the counterclockwise direction from the second substrate toward the first substrate, and the angle is greater than or equal to 15 degrees and less than or equal to 45 degrees in the clockwise direction on the one side of the bent portion and is greater than or equal to 10 degrees and less than or equal to 45 degrees in the counterclockwise direction on the other side of the bent portion when the liquid crystal is twisted in the clockwise direction from the second substrate toward the first substrate, and
the pixel electrode and the video signal line overlap each other, and an amount of the overlap is larger in the bent portion of the video signal line than in the other portions.
2. The liquid crystal display device according to claim 1 , wherein
the angle between the side of the bent pixel electrode and the first direction is greater than or equal to 10 degrees and less than or equal to 25 degrees in the clockwise direction on the one side of the bent portion and is greater than or equal to 15 degrees and less than or equal to 25 degrees in the counterclockwise direction on the other side of the bent portion when the liquid crystal is twisted in the counterclockwise direction from the second substrate toward the first substrate and the angle is greater than or equal to 15 degrees and less than or equal to 25 degrees in the clockwise direction on the one side of the bent portion and is greater than or equal to 10 degrees and less than or equal to 25 degrees in the counterclockwise direction on the other side of the bent portion when the liquid crystal is twisted in the clockwise direction from the second substrate toward the first substrate.
3. A TN-type liquid crystal display device in which liquid crystal is provided between a first substrate and a second substrate, a rubbing process is applied to the first substrate and the second substrate so that a colorscale inversion does not tend to occur in a three o'clock direction or in a nine o'clock direction, and a dot inversion driving or a column inversion driving is applied, wherein
over the first substrate, video signal lines extend, as a whole, along a first direction which is parallel to a twelve o'clock direction and are arranged in a second direction which is parallel to the three o'clock direction, scan lines extend along the second direction and are arranged in the first direction, and a pixel including a pixel electrode is formed in a region surrounded by the video signal line and the scan line, and
the pixel electrode and the video signal line overlap each other, the video signal line and the pixel electrode are tilted within the pixel in a same direction with respect to the first direction, an angle formed by sides of the video signal line and the pixel electrode with the first direction is greater than or equal to 10 degrees and less than 45 degrees in a clockwise direction or is greater than or equal to 15 degrees and less than 45 degrees in a counterclockwise direction when the liquid crystal is twisted in the counterclockwise direction from the second substrate toward the first substrate and the angle is greater than or equal to 15 degrees and less than 45 degrees in the clockwise direction or is greater than or equal to 10 degrees and less than 45 degrees in the counterclockwise direction when the liquid crystal is twisted in the clockwise direction from the second substrate toward the first substrate.
4. The liquid crystal display device according to claim 3 , wherein
the angle formed by the sides of the video signal line and the pixel electrode with the first direction is greater than or equal to 10 degrees and less than or equal to 25 degrees in the clockwise direction when the liquid crystal is twisted in the counterclockwise direction from the second substrate toward the first substrate and the angle is greater than or equal to 10 degrees and less than or equal to 25 degrees in the counterclockwise direction when the liquid crystal is twisted in the clockwise direction from the second substrate toward the first substrate.
5. The liquid crystal display device according to claim 3 , wherein
the angle formed by the sides of the video signal line and the pixel electrode with the first direction is greater than or equal to 15 degrees and less than or equal to 25 degrees in the counterclockwise direction when the liquid crystal is twisted in the counterclockwise direction from the second substrate toward the first substrate and the angle is greater than or equal to 15 degrees and less than or equal to 25 degrees in the clockwise direction when the liquid crystal is twisted in the clockwise direction from the second substrate toward the first substrate.
6. The liquid display device according to claim 3 , wherein
the video signal line and the pixel electrode are bent within the pixel, and an amount of the overlap is larger in the bent portion of the video signal line than in the other portions.