JPS62201095U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing a liquid crystal cell in a conventional liquid crystal watch, Fig. 2 is a plan view showing the long hand of the liquid crystal watch, and Fig. 3 is a plan view showing the short hand of the liquid crystal watch.
Fig. 4 is a system diagram showing the drive circuit of the liquid crystal watch, Fig. 5 is a plan view showing the phenomenon of the pointer display missing in the liquid crystal watch, and Fig. 6 shows the drive circuit of the liquid crystal watch according to an embodiment of the invention. FIG. 7 is a plan view showing the hands of the liquid crystal watch, and FIG. 8 is a circuit diagram showing the main parts of the drive circuit shown in FIG. 6. 5a to 5d... Segment electrode, 11, 12... Liquid crystal cell, 13... Long hand, 14... Short hand, 18... Shift register for long hand, 19... Shift register for short hand, 20, 21... Phase control circuit, 22... Shiya circuit disconnection, 24... drive circuit, 25... segment signal generation circuit, 26... clock signal generation circuit, d, i... clock signal, e, f... primary segment signal, g,
h...Secondary segment signal. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A plurality of liquid crystal cells each having a built-in liquid crystal layer whose optical rotation angle changes with the application of voltage are polymerized, and each liquid crystal cell has a large number of segment electrodes arranged radially. In a liquid crystal display that displays pointers of different lengths for each liquid crystal cell by applying segment signals generated by a drive circuit to segment electrodes of the LCD, the drive circuit generates a reference signal with a constant period. a clock signal generation circuit that receives the reference signal and outputs a clock signal with a period corresponding to each pointer, and the segment that receives each of the clock signals and is distributed to a large number of segment electrodes forming each pointer. A segment signal generation circuit that outputs a signal, and a cutoff circuit that prevents the segment signal from being applied to a segment electrode of a liquid crystal cell that displays the shorter pointer at a position where any two pointers overlap. A liquid crystal display device comprising: (2) At the position where any two pointers overlap, the short circuit is closed in response to a segment signal sent to the segment electrode that displays the longer pointer, and then closes to the segment electrode that displays the shorter pointer. A liquid crystal display according to claim 1, which comprises a gate circuit that prevents the segment signal from being applied. (3) The liquid crystal display device according to claim 1 or 2, wherein the plurality of liquid crystal cells are two-layer liquid crystal cells each displaying a long hand and a short hand.