JPS5820956Y2 - exiyouhiyoujisouchi - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a liquid crystal display device.

Conventionally, there have been the following types of watches that statically drive a liquid crystal display to display the time in analog form.

On a glass substrate facing eight fan-shaped control electrodes provided on a circular glass substrate, eight selection electrodes are provided radially opposite seven of the control electrodes, and the remaining one control Four selection electrodes are provided opposite the electrodes, for a total of 60 selection electrodes.

The first to eighth selection electrodes facing each control electrode are connected to a common lead wire.

First, a control voltage is supplied to the first control electrode, and a selection voltage is supplied to each first selection electrode to cause only the liquid crystal between the first control electrode and the first selection electrode facing thereto to respond.

While the control voltage is being supplied to the first control electrode, the selection up to the eighth selection electrode is sequentially performed.

Next, a control voltage is supplied to the second control electrode, and the selection electrodes are sequentially selected in the same manner as described above.

There have been devices that perform analog display of time by sequentially controlling the eight control electrodes in this manner and simultaneously selecting each selection electrode in sequence.

However, according to this method, when the display time changes, the previously displayed position is hidden and the display position moves sequentially, making it difficult to read, especially when the display position moves quickly, such as seconds display. Ta.

Therefore, in the present invention, a plurality of control electrodes and a selection electrode are made to face each other via a liquid crystal to form a plurality of display segments, and the selection electrodes of the selection electrode group facing each control electrode are sequentially connected in common to make one selection. Selection inputs equal to the number of selection electrodes constituting an electrode group are provided, and at least one of a display voltage and a non-display voltage for displaying or non-displaying these in each display segment is set to two or more voltages. The above-mentioned drawbacks are eliminated by sequentially and cumulatively displaying each display segment group using a voltage of .

An embodiment in which the present invention is used to display seconds will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a display device according to the present invention.

FIG. 2 is an exploded view of the main parts of the display device shown in FIG. 1, and 1 is a glass substrate.
Fan-shaped control electrodes 2゜3...13 divided into two halves are provided electrically independently, and each electrode is connected to a lead wire 2a, 3a...13a, respectively. .

A glass substrate 14 faces the glass substrate 1 with a spacer 14a and a field effect liquid crystal interposed therebetween.

On the surface of the glass substrate 14 in contact with the liquid crystal, there are selective electrodes a, a2, . . . al divided into 60 equal parts.

. bl, b2...b1□...el, e
2...el2 is provided.

Selection electrodes al, bl...el, a2. b2...
...e2...n1□, b1□...
el2 selects electrode groups A1, A2, respectively.
・Constitutes n1□.

Control electrodes 2, 3...13, liquid crystal and selection electrodes al, bl...el, a2. b2...
e2...n1□, b□2...e□2 constitute a display segment.

Selection electrode a1. a2...n1□, bl. b2・
...bl.

....el, e2 ....e□2 are the common lead wires P1. P2...Connected to P5.

15 and 16 are polarizing plates each having a polarization axis shifted by 90 degrees.

FIG. 3 shows a drive circuit for the display device shown in FIG.

17 is a crystal oscillator, and 18 is a frequency division stage.

19 is a control electrode selection pulse generation circuit, which is a flip-flop.

These output terminals 19a, 19b...19
1, pulses are generated in the 4th A, B...L as shown in the diagram.

Reference numeral 20 denotes a selection pulse generation circuit for the selection electrode, which is composed of a flip-flop circuit and a gate circuit.

The pulse generating circuits 19 and 20 described above are used in this type of drive circuit.

Pulses are generated at the output terminals 20a, 20b, . . . , 20e as shown in the fourth S1, S2, . . ., S5.

21 is a voltage selection supply circuit.

22 is a control electrode drive circuit, and this output terminal n1, n
2...n12 has the 5th N. , N2...
・N1□The pulse shown in the figure is generated.

23 is a selection electrode drive circuit, and this output terminal m1, m
2...M5 has the 5th M1.

N2...M5 A pulse shown in the diagram is generated.

FIG. 6 shows the voltage selection supply circuit 21 and the control electrode drive circuit 2.
2 and a selection electrode drive circuit 23 are shown.

24.25...43 is a transfer element 44 such as a transfer gate or a semiconductor switching element.

45...52 is an inverter.

Next, the operation will be explained.

In the following explanation, it is assumed that the liquid crystal has voltage-transmitted light amount characteristics shown in FIG.

In FIG. 6, a pulse with a frequency for AC driving the liquid crystal is supplied to the terminal q, and when the pulse is at a high level, the transmission elements 24 and 27 are turned on, and the terminals u1 and u
2 are held at potentials 2V and 0, respectively.

Further, when the pulse becomes low level, the transmission elements 25, 2
6 is turned on and terminals u1 and u2 are at potentials 0 and 2V, respectively.
to hold.

Therefore, depending on the level of the pulse, the terminals u1, u
2 are alternately held at two potentials, 2V, 0, 0, and 2V, respectively.

Therefore, as an example, if we consider a state in which the pulse shown in Figure 4B is supplied to the terminal 19b and the pulse shown in Figure 452 is supplied to the terminal 20b, when the terminal 20b is at a low level, the transfer element 31 is turned on, and the terminal m2 is the potential 2V of terminal u1
, 0, and when the terminal is at a high level, the transfer element 30 is turned on, and the terminal m2 is held at the potential ■.

On the other hand, when the terminal 19b is at a low level, the transfer element 41 is turned on, and the terminal n2 is held at the potential of the terminal u2 of 0.2V.

When the terminal 19b is at a high level, the transfer element 40 is turned on and the terminal n2 is held at the potential V.

FIG. 8 shows the voltage applied between the terminals n2m2 due to the potential generated in this way.

Voltages -2V, 2V, -V, V, O between terminals n2 and m2
is selectively applied, but in this embodiment, since polarizing plates 15 and 16 whose polarization axes are shifted by 90 degrees are provided, when voltages -2V, 2V, -V, and V, which are higher than the saturation voltage, are applied, The liquid crystal remains responsive and the display segments darken.

When a voltage O below the threshold voltage is applied, the liquid crystal remains in a non-responsive state and the display segment becomes bright.

Similar voltages are applied between other terminals as well.

In this way, the fifth N. , N
2...N1□ figure and 5th M1, N2...
...The pulse shown in M5 is generated, and each terminal nx-my (X
= 1, 2...12, y= 1.2----5
) between the 9th X. , X2...X60 pulses shown in the diagram are applied.

Therefore, in the display device shown in the first diagram, the display is incremented by one second, and the seconds are cumulatively displayed in units of five seconds.

In the first illustration, the hatched area is brightly displayed and indicates 8 seconds.

In the above embodiment, the polarization axes of both polarizing plates may be made parallel to each other, and the brightness and darkness of the display may be reversed.

Further, although a field effect type liquid crystal was used in the above embodiment, a dynamic scattering type liquid crystal may also be used.

Further, the voltage applied to the liquid crystal is not limited to the above-mentioned voltage, and any voltage that is lower than the threshold voltage or higher than the saturation voltage may be used.

Further, in the above-described embodiment, the display is used to display seconds, but the display is not limited to this, and may be used to display hours, minutes, and the like.

Moreover, it may be used not only for displaying time but also for displaying data of various meters.

As detailed above, according to the present invention, a plurality of control electrodes and a selection electrode are made to face each other via a liquid crystal to form a plurality of display segments, and the selection electrodes of the selection electrode group facing each control electrode are sequentially Selection inputs equal to the number of selection electrodes connected in common to form one selection electrode group are provided, and at least one of a display voltage and a non-display voltage for displaying or non-displaying these is applied to each display segment using two types of selection inputs. voltage, and these voltages are used to sequentially and cumulatively display each display segment group, resulting in no crosstalk, fast response, clear display, and fewer lead wires. This reduces power consumption and makes the display easy to read.

[Brief explanation of the drawing]

FIG. 1 is a front view of a display device according to an embodiment of the present invention, and FIG.
The figure is a developed view of the main parts of Figure 1, Figure 3 is a block diagram showing an example of the drive circuit of the display device shown in Figure 1, Figures 4 and 5 are time charts for explanation, and Figure 6 is the third
A circuit diagram showing an example of a part of the circuit shown in the figure, FIG. 7 is a characteristic diagram showing the voltage-transmitted light amount characteristic of the liquid crystal used in this example,
FIG. 8 is a table showing an example of voltage application, and FIG. 9 is a time chart for explanation. 2.3...13...Control electrode, A□,
A2...A12...Selected electrode group, al
, a2...al2. bl, b2...b
1□...el, e2...el. ...Selection electrode, PI, P2...P5.
...Terminal.

Claims (1)

[Scope of utility model registration request] A control electrode divided into a plurality of parts is provided, a selection electrode group is provided facing each of the control electrodes via a liquid crystal, and a display segment is configured by the control electrode, the liquid crystal, and the selection electrodes constituting the selection electrode group. The selection electrodes of the selection electrode group are sequentially commonly connected to provide selection inputs equal to the number of selection electrodes constituting one selection electrode group, and a plurality of different voltage values are supplied to the control electrode and the selection electrode, respectively. A voltage supply means is provided for setting at least one of a display voltage and a non-display voltage for displaying or non-displaying a display segment by a voltage applied between the electrodes to two or more different voltage values, and by this voltage supply means. A display constituted by a group of selection electrodes, in which a desired voltage is sequentially supplied to each of the control electrodes, and a display voltage is sequentially and cumulatively applied between the control electrode to which the desired voltage has been supplied and the selection electrode facing the control electrode. A liquid crystal display device which displays a group of segments in an integrated manner, and after the integrated display ends, hides the displayed segment group and displays the next group of display segments in an integrated manner.