JPS58111091A - Color liquid crystal display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color liquid crystal display device. Conventional color display devices using liquid crystals generally have a so-called negative display where voltage is applied to the segment parts to make them appear white. 'TfL is 1, but the positive display has a brighter display and less freedom in design. However, with a single-layer cell, it is difficult to obtain a positive display with high contrast, and with a two-layer cell, a southern contrast can be obtained, but the disadvantage is that it becomes opaque.

SUMMARY OF THE INVENTION Therefore, the present invention provides a contrast positive color liquid crystal display device which is inexpensive and has an extremely simple structure.

An embodiment of the present invention will be described below based on one example.

In FIG. 1, segment electrodes 81 to 8 are formed on one substrate (-not shown). Control electrodes &E are formed on the substrate so as to surround each segment electrode. A two-layer common electrode C is formed on the other substrate facing this substrate with a color liquid crystal interposed therebetween.

Figure 5 shows an example of a circuit that displays numbers with the above configuration, where OT is a clock pulse generator, OT is a counter, DlB is a decoder, and pa is a pulse generation circuit whose output Terminal W.

From y, buses W and Y whose phases are shifted from each other as shown in FIG. DR is a drive circuit, and decoder DI
The pulses W and Y are selectively supplied to the segment electrodes 81 to 81 according to the outputs of the segment electrodes 81 to 81.

As mentioned above, pulses Y and W are supplied to the control electrode E and the common electrode C, respectively, so a voltage pulse is applied between both electrodes as shown in Figure 4C, and the periphery of each segment is outlined in white. Become.

A pulse Y tube is supplied to the segment electrode located at the position where ' is to be hidden to make it appear white, and a pulse W is supplied to the segment electrode located at the position where it is to be displayed, and the voltage is applied between it and the common electrode C. There are some that perform positive display by setting the voltage to 0.

FIG. 5 shows the reference T-2 and shows the fc-coupling. In this case, the segment electrode 81 e Sl e 84
e Apply pulse W to SI *81, and apply pulse W to segment electrode S.
This is the one that supplies the pulse Y to a and S.
Therefore, the segment electrode 81 s 'I's S4 s
When the voltage applied to 8% + St and the common electrode C-1 is 0, a voltage pulse is applied between the segment electrode Sl m SI and the common electrode C, and the ridge 'f-2 is displayed as positive as shown in No. 5-. be done.

As described above, according to the present invention, the control electrode surrounding each segment electrode is constructed so that the control electrode can be used for self-control. Since the display is performed with one side blanked out, a color O-positive display with high contrast can be obtained, which is simple and inexpensive to construct a circuit.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, FIG. 1 is a front view of the segment electrode and the 11ilJ control electrode, FIG. 2 is a front view of the common electrode, FIG. 3 is a block diagram showing an example of the circuit configuration, and FIG. FIG. 4 is a nine-waveform diagram showing pulses supplied to each electrode and voltage pulses applied between the electrodes, and FIG. 5 is a front view showing one display mode. 81~day? ...Segment electrode E...Control-pole C
...Common electrode OT...Counter D]e・
...Leverage f PG...Pulse generation circuit DR
...Drive circuit and above Applicant Seiko Co., Ltd. Figure 1 Figure 5 Figure 3 Figure 4 → Tokiyami

Claims (1)

[Claims] A plurality of segment electrodes are formed on one substrate, a control electrode is formed surrounding the periphery of each segment electrode, and a common electrode is formed on the other substrate facing the one substrate with a liquid crystal interposed therebetween. pulse trains having different phases are supplied to the control electrode and the common electrode, respectively, and the same pulse train as that supplied to the common electrode is supplied to the segment electrode at the position to be displayed, and the segment electrode is not displayed. A drive open circuit is provided to the segment electrodes located at the six segment electrodes to supply a pulse train having a phase different from that of the pulse train supplied to the common electrode.