Liquid crystal display device
View Patent ↗A pixel electrode is formed on a TFT substrate, and a gate insulating film is formed thereon. On the gate insulating film, formed is an inorganic passivation film, on which a common electrode having slits is formed. Through-holes are formed in the gate insulating film at areas where the pixel electrode faces the common electrode, and the pixel electrode is not connected to a source electrode in the through-hole. The through-holes are filled with the inorganic passivation film, and the common electrode is formed on the inorganic passivation film at a position corresponding to each through-hole. The pixel electrode faces the common electrode at the position through not the gate insulating film but only the inorganic passivation film, and thus the pixel capacity can be increased. Accordingly, it is possible to prevent changes in the electric potential of the pixel electrode caused by ON/OFF operations.
1. A liquid crystal display device comprising:
a TFT (thin-film transistor) substrate on which pixels having pixel electrodes and TFTs are formed in a matrix shape;
an opposed substrate having color filters; and
liquid crystal sandwiched between the TFT substrate and the opposed substrate,
wherein a pixel electrode is formed on the TFT substrate, a gate insulating film is formed on the pixel electrode, an inorganic passivation film is formed on the gate insulating film, and a common electrode having slits is formed on the inorganic passivation film;
a video signal is supplied to the pixel electrode from a source electrode of a TFT through a first through-hole of the gate insulating film;
a second through-hole is formed in the gate insulating film at a position where the pixel electrode faces the common electrode, and the pixel electrode and the source electrode are not connected to each other in the second through-hole;
the inorganic passivation film is formed in the second through-hole; and
the common electrode is formed on the inorganic passivation film at an area corresponding to the second through-hole.
2. The liquid crystal display device according to claim 1 , wherein the plural second through-holes are formed in the gate insulating film at areas corresponding to the striped common electrode sandwiched between the slits.
3. The liquid crystal display device according to claim 2 , wherein the plural through-holes are formed at predetermined pitches.
4. The liquid crystal display device according to claim 2 , wherein no through-holes are formed in the gate insulating film at areas corresponding to the slits of the common electrode.
5. A liquid crystal display device comprising:
a TFT (thin-film transistor) substrate on which pixels are formed in a matrix shape, each of the pixels having a pixel electrode and a TFT, and having a transmissive area and reflective area;
an opposed substrate having color filters; and
liquid crystal sandwiched between the TFT substrate and the opposed substrate,
wherein in the reflective area, a pixel electrode is formed on the TFT substrate, a gate insulating film is formed on the pixel electrode, and plural through-holes are formed in the gate insulating film;
a source electrode extending from a TFT is formed while covering the gate insulating film and the plural through-holes;
an inorganic passivation film is formed while covering the source electrode, and a common electrode having slits is formed on the inorganic passivation film;
the source electrode is conductive with the pixel electrode in the plural through-holes of the gate insulating film; and
the source electrode formed on the gate insulating film and the plural through-holes forms a diffuse reflection surface.
6. The liquid crystal display device according to claim 5 , wherein the plural through-holes formed in the gate insulating film are also formed at areas corresponding to the slits.
7. A liquid crystal display device comprising:
a TFT (thin-film transistor) substrate on which pixels having pixel electrodes and TFTs are formed in a matrix shape;
an opposed substrate having color filters; and
liquid crystal sandwiched between the TFT substrate and the opposed substrate,
wherein a pixel electrode is formed on the TFT substrate;
a gate insulating film is formed while covering a periphery of the pixel electrode;
no gate insulating film is provided on the inner side relative to the periphery of the pixel electrode and an inorganic passivation film is directly formed on the pixel electrode; and
a common electrode having slits is formed on the inorganic passivation film.
8. A liquid crystal display device comprising:
a TFT (thin-film transistor) substrate on which pixels having pixel electrodes and TFTs are formed in a matrix shape;
an opposed substrate having color filters; and
liquid crystal sandwiched between the TFT substrate and the opposed substrate,
wherein a pixel electrode is formed on the TFT substrate, a gate insulating film is formed on the pixel electrode, an inorganic passivation film is formed on the gate insulating film, and a common electrode having plural slits is formed on the inorganic passivation film;
a video signal is supplied to the pixel electrode from a source electrode of a TFT through a first through-hole of the gate insulating film; and
an area with the gate insulating film removed is formed at a position where the pixel electrode faces the common electrode, and the inorganic passivation film is directly formed on the pixel electrode at the area with the gate insulating film removed.
9. The liquid crystal display device according to claim 8 , wherein the area with the gate insulating film removed is an area corresponding to the striped common electrode sandwiched between the slits.