Normally black mode active matrix liquid crystal display device wherein a part of an edge of a protection transistor provided in a frame portion is covered with a transparent electrode
View Patent ↗Disclosed is an active matrix liquid crystal display device including: an active matrix liquid crystal display device of a normally black mode which includes an active matrix substrate and an opposed substrate and in which a black matrix is not provided on the opposed substrate, wherein a gap between opaque electrodes which are closely located and whose electric potentials are different from each other in a frame portion around a display area of the active matrix substrate is covered with a constant-potential transparent electrode arranged in an upper layer of the gap.
1. An active matrix liquid crystal display device of a normally black mode, comprising:
an active matrix substrate; and
an opposed substrate, in which a black matrix is not provided on said opposed substrate,
wherein the opposed substrate includes a color layer at a position corresponding to a frame portion around a display area of said active matrix substrate,
wherein said active matrix substrate includes a protection transistor provided in the frame portion, said protection transistor being configured to discharge electric charge when a static electrical charge is generated in a signal line provided in the frame portion, and
wherein a part of an edge of said protection transistor is covered with a transparent electrode arranged above said protection transistor.
2. The active matrix liquid crystal display device claimed in claim 1 , wherein
in an extraction side of said frame portion from which a scanning line is extracted, said scanning line is connected to said opaque electrodes composed of a metal forming signal lines,
said opaque electrodes are extended in a direction substantially orthogonal to a direction in which said scanning line is extended and overlap with one of said scanning lines adjacent to said connected scanning line, and
a part of an edge of said constant-potential transparent electrode is arranged above said opaque electrodes.
3. The active matrix liquid crystal display device claimed in claim 1 , wherein
a part of an edge of said constant-potential transparent electrode is arranged outside an edge of a polarizing plate provided in said active matrix substrate side or said opposed substrate side.
4. The active matrix liquid crystal display device claimed in claim 1 , wherein
a part of an edge of said constant-potential transparent electrode is arranged outside an end seal which seals a liquid crystal sandwiched between said active matrix substrate and said opposed substrate.
5. The active matrix liquid crystal display device claimed in claim 1 , wherein
a protection transistor is provided in said frame portion,
said constant-potential transparent electrode includes a through-hole part which is formed so as to avoid overlapping with a channel part of said protection transistor, and
an edge of said through-hole part is arranged so as to overlap with a gate electrode of said protection transistor.
6. The active matrix liquid crystal display device claimed in claim 1 , wherein
a liquid crystal which is vertically aligned is sandwiched between said active matrix substrate and said opposed substrate, and
a transparent electrode having the same electric potential as that of said constant-potential transparent electrode in said active matrix substrate is arranged in said opposed substrate side.
7. The active matrix liquid crystal display device claimed in claim 1 ,
wherein said liquid crystal display device is an IPS system liquid crystal display device or a VA system liquid crystal display device.
8. An active matrix liquid crystal display device of normally black mode, comprising:
an active matrix substrate; and
an opposed substrate,
wherein a black matrix is not provided on said opposed substrate,
wherein, in a cross-sectional view, said active matrix substrate includes a protection transistor at a frame portion thereof, said protection transistor being configured to discharge electric charge when a static electrical charge is generated in a signal line provided in the frame portion,
wherein a part of an edge of said protection transistor is covered with a transparent electrode located above said protection transistor,
wherein, in the cross-sectional view, the transparent electrode includes a through-hole part above said protection transistor,
wherein, in the cross-sectional view, an edge of the through-hole part is located above the protection transistor, and
wherein, in the cross-sectional view, a part of an edge of the transparent electrode is located above the protection transistor.
9. The active matrix liquid crystal display device as claimed in claim 1 , wherein the transparent electrode overlaps with the protection transistor by at least 1 μm.
10. The active matrix liquid crystal display device as claimed in claim 8 , wherein the transparent electrode overlaps with the protection transistor by at least 1 μm.