A liquid crystal display device having a pair of substrates, at least one of which is transparent, a liquid crystal layer interposed between the pair of substrates, an electrode structure formed on one of the pair of substrates for generating an electric field in said liquid crystal layer, the electrode structure including at least one common electrode and at least one pixel electrode, a gate insulating film formed on the one common electrode, an insulation layer formed on the gate insulating film and an orientation film formed on the insulation layer. A sum of thickness of the gate insulating film, the insulation layer and the orientation film is no greater than about 2.8 .mu.m.
CROSS REFERENCE TO RELATED APPLICATION
This is a continuation of U.S. application Ser. No. 09/336,689, filed Jun. 21, 1999, which is a continuation of U.S. application Ser. No. 08/770,728, filed Dec. 19, 1996, now U.S. Pat. No. 5,914,761, issued Jun. 22, 1999, which is a continuation of U.S. application Ser. No. 08/309,157, filed Sep. 20, 1994, now U.S. Pat. No. 5,600,464, issued Feb. 4, 1997, the subject matter of which is incorporated by reference herein.
Priority Data
Sep 20, 1993 [JP] 5-233262 Oct 12, 1993 [JP] 5-254028
An in-plane-switching-mode (IPS) LCD device includes a TFT substrate and a CF substrate sandwiching therebetween a liquid crystal (LC) layer, and a pair of polarizing films sandwiching therebetween the TFT and CF substrates and LC layer. The TFT substrate includes a SiNx insulation layer having a higher refractive index compared to the TFT substrate and LC layer. The thickness (d) of the SiNx layer is expressed by d=(100+170.times.k).+-.30 where k is an integer not smaller than zero and not larger than 5. The protective layer of the light-incident-side polarizing film near the insulation film has a thickness larger than zero and not larger than 57 .mu.m.
A liquid crystal display device includes a pair of substrates, at least one of which is transparent; a liquid crystal layer interposed between the pair of substrates; an electrode structure formed on one of the pair of substrates for generating an electric field in said liquid crystal layer, the electrode structure including at least one common electrode and at least one pixel electrode; a gate insulating film formed on the one common electrode; an insulation layer formed on the gate insulating film; and an orientation film formed on the insulation layer. The gate insulating film, the insulation layer and the orientation film have a combined thickness which is no greater than a predetermined thickness.
A liquid crystal display is fabricated on a silicon wafer substrate. A pixel electrode layer is formed on the silicon wafer substrate on which driving circuits and active switching elements are fabricated. The pixel electrode layer has a plurality of pixel electrodes with a pixel electrode gap between every two pixel electrodes. After covering the pixel electrode layer with an insulating layer, a common electrode layer is formed. The common electrode layer has a plurality of major common electrodes each formed above a pixel electrode gap. At least one minor common electrode may be interposed between every two major common electrodes. Alignment films are printed above the common electrode layer and on the inner side of an upper glass substrate. A liquid crystal layer filled with negative type liquid crystals is then formed between the silicon wafer substrate and the upper glass substrate.
A liquid crystal display device includes a d.c. voltage source for producing a common voltage such that the common voltage is substantially equal to a central voltage of a bipolar voltage signal.
A reflective type fringe field switching mode liquid crystal display device having improved contrast is provided. The device has a lower and an upper substrates arranged with a distance and having a unit pixel defined therein. Between the substrates, a liquid crystal layer having a plurality of liquid crystal molecules are interposed. A counter electrode is formed on an inner surface of the lower substrate in the unit pixel. A pixel electrode is formed above the counter electrode. The pixel electrode and the counter electrode generate a fringe field for driving the liquid crystal molecules in the unit pixel. A horizontal alignment layer having a rubbing axis is interposed between the lower substrate and the liquid crystal layer, and a vertical alignment layer is interposed between the upper substrate and the liquid crystal layer. In addition, a polarizer is disposed on an outer surface of the upper substrate and having a polarizing axis.
