1. Field Of The Invention
The present invention relates generally to a liquid crystal device. More particularly, the present invention relates to a double-layered type super-twisted nematic liquid crystal display device including a display cell and a compensating cell in a laminated state.
2. Description Of The Related Art
To facilitate understanding of the present invention, a typical conventional double-layered type super-twisted nematic liquid crystal display device will briefly be described below with reference to FIG. 3.
As shown in FIG. 3, the conventional display device is constructed such that a display cell 31 is superimposed on a compensating cell 3e in a layered structure with a spacer 33 interposed therebetween such that the display cell 31 is arranged on the front side of the display device. In addition, a light source 34 for illuminating the display cell 31 and a reflector 35 are arranged on the rear surface side of the compensating cell 32.
The display cell 31 is provided with a common transparent electrode and a segment transparent electrode both of which are electrically connected to one terminal of a driver circuit 36 at the right-hand end of a substrate as seen in the drawing.
Basically, since there is no need of feeding the compensating cell 32 with an electric current, any transparent electrode is not required for the compensating cell 32. In some case, however, a transparent electrode is formed over the whole surface of the substrate because of a necessity associated with a convenience of production.
With respect to the conventional liquid crystal display device constructed in the above-described manner, it has been found that erroneous display takes place under the influence of exterior static electricity, since the display cell is arranged on the front surface side of the display device. When the display device is used under an environmental circumstance having a lower temperature, it is necessary that the display cell 31 is warmed up in order to assure that any delay of a response speed is prevented reliably. However, as long as the compensating cell 32 is arranged on the light source 34 side, there appears a problem that it is practically difficult to positively utilize heat generated by the light source 34 for the purpose of warming up the display cell 31.