This is the TN (Twisted Nematic)-type liquid crystal display. It is possible to 4 digits display but the display of the maximum figure is only "1". It isn't possible to work continuously in the direct current. However, when applying the about 5-V DC voltage between the backplane (common) and the terminal, the color of the segment which corresponds can be temporarily changed to the black. With this, the correspondence of the terminal and the display segment can be confirmed.
