JPS5831555B2 - exiyouhiyoujisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display device equipped with a large number of display elements, and particularly to a liquid crystal display device that can be used as a time display section of a watch.

The Nesa glass plate constituting this liquid crystal display device is usually formed by coating a transparent conductive thin film, such as tin oxide or indium oxide, on a transparent glass plate or an opaque glass plate depending on the application.

Furthermore, the connection wires connecting each electrode and the lead wires for applying pulses to the electrodes are also coated with the transparent conductive thin film of tin oxide, indium oxide, or the like.

When a liquid crystal display device includes a large number of display elements, a problem arises in that these lead wires and connection wires intersect and come into electrical contact.

In such cases, conventionally, an insulator was interposed between the intersecting lines to prevent electrical contact with insects.

However, it is extremely difficult to manufacture a liquid crystal display device that uses an insulator to prevent electrical contact.
Moreover, it also had the disadvantage of increasing its cost.

In view of this, the present invention aims to provide a liquid crystal display device in which a large number of electrodes constituting the liquid crystal display device can be electrically connected on a plane without intersecting connection lines. .

The present invention will be described in detail below based on illustrative drawings.

Reference numeral 1 shown in FIG. 1 is a liquid crystal display having 60 display elements 2.

This liquid crystal display 1 includes 60 segment electrodes 3...
and 12 common electrodes 4...

The 60 segment electrodes 3 are divided into 12 blocks of 5 each, and the arrangement interval of the segment electrodes 3 is narrow within a block and wide between blocks.

Segment electrodes 3 of each of these divided blocks 5...
The common electrode 4 is arranged opposite to...

The 60 segment electrodes 3 . . . are currently arranged in a single arrangement in order to be used for displaying the minutes of a clock as shown in FIG.

Starting from the 12 blocks 5...the 5 segment electrodes 3... located in the middle early block, adjacent blocks are located at corresponding positions via the dividing boundary 30 divided into the blocks 5. The segment electrodes are electrically connected to each other by connecting wires 31, and are sequentially connected in series in a meandering manner.

This constitutes five segment electrode groups connected in series in a meandering manner.

On the other hand, the 12 common electrodes 4 are arranged in a ring as shown in FIG.
The segment electrodes 3 are arranged opposite to the divided blocks 5 of the segment electrodes 3.

A liquid crystal (not shown) is interposed between the segment electrodes 3 and the common electrodes 4.

In detail, the Nesakarasu 32 is coated with a segment electrode 3 made of a transparent conductive thin film such as tin oxide or indium oxide, and the common electrode 4 is similarly made of a transparent conductive thin film such as tin oxide or indium oxide. A spacer (
(not shown), etc., and then filled with liquid crystal.

Lead wires 3 led out from each of the common electrodes 4...
4... are respective output terminals C1...C1 of the common electrode selection switch 6 (hereinafter referred to as the common switch 6).
It is electrically connected to 2.

On the other hand, the segment electrode 3 located within the initial block
Lead wires 35 led out from... are electrically connected to output terminals S1...S5 of a segment electrode selection switch 7 (hereinafter referred to as segment switch 7).

The common switch 6 includes input terminals 8, 9, and 10 for applying pulses to the common electrodes 4.

On the other hand, the segment switch 7 connects the segment electrodes 3...
The input terminal 1112 is provided for applying a pulse to the input terminal 1112.

These common switches 6 and segment switches 7 are
This switch performs the same selective switching operation as the switch shown in FIGS. 5 and 6, but is configured electronically.

As such an electronic selection switch, there is a switch constructed from an appropriate number of transmission gates 13 and inverters 14 as shown in FIGS. 7 and 8.

What is illustrated in FIG. 7 is the common switch 6.

This common switch 6 includes 12 sets of selection changeover switch sections A1 to A12.

Each selection switch section includes three transmission gates 1313.13 having a common output terminal, and an inverter 14 arranged to provide a complementary signal to the control signal input terminal of each transmission gate 13. .

On the other hand, the segment switch 7 shown in FIG.
It is.

This segment switch 7 includes five sets of selection switch sections B1 to B5.

Each selection switch section includes two transmissions 13, 13 having a common output terminal, and an inverter 14 arranged to provide a complementary signal to the control signal input terminal of the transmission gate 13.

The input terminal 8 of the common switch 6 is electrically connected to the input terminal of each of these transmission gates 13.
9.10 and input terminal 11.1 of segment switch 7
2 is connected to each output terminal of the first counter device 17, as shown in FIG.

This first counter device 17, as shown in FIG.
It consists of four successive stages of delay-type flip-flops as Johnson counters.

The input terminal 24 of this first counter device is connected to the frequency dividing device 16.
It is connected to the output terminal of.

This frequency dividing device 16 is an oscillation device 1 that generates high frequency pulses.
5. For example, it is connected to an oscillation circuit equipped with a crystal oscillator, and divides the high frequency pulse of this crystal oscillator to a low frequency within the response range of the liquid crystal.

The output terminal Q20 of the first stage flip-flop 20 constituting the first stage counter device 17 is connected to the input terminal 12 of the segment switch 7, and one output terminal Q21 of the second stage flip-flop is connected to the input terminal 12 of the segment switch 7. It is connected to the input terminal 10 of the common switch 6, and the other output terminal Q
21 is connected to the input terminal 8 of the common switch 6,
The output terminal Q22 of the third stage flip-flop 22 is connected to the input terminal 11 of the segment switch 7.
The output terminals Q23 of the stage flip-flops 23 are connected to the input terminals 9 of the common switch 6, respectively.The output terminals 27 of the first counter device 17 are connected to the second counter device 1.
It is connected to 8.

This second counter device can be constructed of a Johnson counter in which an appropriate number of stages of D-type flip-flops are connected, or a Johnson counter in which an appropriate number of stages of JK master-slave type rough flip-flops are connected.

The output terminal of this second counter device 18 is connected to the control signal input terminal 25 (
P1-P5), 26 (qla, qlb.

q1c=q12a, q12c).

Next, the operation of the liquid crystal display device of the present invention will be explained.

The high frequency pulse emitted by the oscillator 15 is transmitted to the frequency dividing device 1
6, the frequency is divided to a low frequency within the response range of the liquid crystal.

The low frequency pulse frequency-divided by this frequency dividing device 16 is
It is supplied to the input terminal 24 of the counter device.

The pulses supplied to the input terminal 24 of the first counter device 17 serve as clock pulses for each stage flip-flop, and are supplied to the output terminal Q2 of the first stage flip-flop 20.
0, the output terminal Q21 of the second stage flip-flop 21. The output terminal Q22 of the third stage flip-flop 22 and the output terminal Q23 of the fourth stage flip-flop 23 have 1/8
Pulses with different periodic phases are emitted.

To the other output terminal Q21 of the second stage flip-flop 21, a pulse having a 1/2 cycle phase different from the output pulse of the output terminal Q21 of the second stage flip-flop is generated.

As a result, the input terminals 8, 9, 10 of the common switch 6
As shown in FIG. 11, pulses VCOM1, VCOM2 . VCOM3 is supplied, and on the other hand, the input terminals 11 and 12 of the segment switch 7
The pulses VSeg1. with different 1/4 period phases are used. V
Seg2 will be supplied.

These three types of pulses with different 174-cycle phases and 1/
Due to the combination of two types of pulses having four different periods and phases, the potential difference generated between the common electrode 4 and the segment electrode 5 is as shown in FIG. 12.

That is, the effective value of the synthetic liquid due to the combination of pulse VSeg1 and pulse VCOM1, the combination of pulse Seg2 and pulse VCOM1, and the combination of pulse VSeg1 and pulse VCOM2 is 3/4VP (V
P indicates the peak voltage of the pulse).

On the other hand, the effective value of the synthetic liquid obtained by the combination of pulse VSeg2 and pulse VCOM2, the combination of pulse VSeg1 and pulse VCOM3, and the combination of pulse VSeg2 and pulse 2C0M3 is 1/4VP.

Therefore, the value of the peak voltage VP of the pulse is reduced to 1/2
By setting VP to be the threshold voltage of the liquid crystal, it is possible to obtain the six best blinking states of the liquid crystal display element as shown in the table of FIG. 13.

In this table, ON indicates a state in which the display element is on, and OFF indicates a state in which the display element is off.

The output pulse of the output terminal 27 of the first count device is
input to the second counter device.

Signals from the output terminals of the D-type flip-flops in each stage constituting this second counter device are supplied to each transmission gate via control signal input terminals 25 and 26 of the transmission gate, and control the operation of each transmission gate. do.

These control signals, especially the signals marked on the control signal input terminal 26 of the common switch 6, are configured so that only the - transmission gate in each selection changeover switch section takes an ON operation. be.

As shown in FIG. 8, the segment switch 7 is used by one inverter 14 for the two transmission gates 13 of the selection switch sections B1 to B5, but the common inverter 14 in FIG. When one inverter 14 is provided for one transmission gate 13 as in the selection changeover switch section of the switch 6, the control signal for the segment switch 7 is changed to the control signal for the common switch 6. , it is necessary to configure so that only the - transmission gate 13 in each selection changeover switch section takes an ON operation.

In response to these control signals, only the transmission gates 13 located in the selection changeover switch sections A1 to A12 of the common switch 6 and the selection changeover switch sections B1 to B5 of the segment switch 7 are turned on.

With this, each of the output terminals c1 to C12 of the common switch 6 receives a pulse VCOM1.

Only the pulse of either VCOM2 or VCOM3 is supplied, while the output terminal 81 of the segment switch 7
~S5 are supplied with only one of the pulses VSeg1 and VSeg2, and the corresponding common electrodes and segment electrodes are supplied with the pulses.

Next, the display operation of the liquid crystal display will be explained based on FIG. 4.

First, the pulses applied to the common electrodes 4 of all blocks 5 of the display body are set to VCOM3, and on the other hand,
VSe is the pulse applied to all segment electrodes 3...
Set it to g2.

In this state, as shown in FIG. 13, each display element is in a blank state.

Next, a pulse (
(hereinafter referred to as common pulse) from VCOM3 to VCOM2
and the pulse applied to the other common electrode is V
COM3(7)f is retained.

In this state, the pulse (
(hereinafter referred to as a segment pulse) are switched from VSeg2 to VSegl in the order of output terminals s1...S5 of the segment switch 7.

As a result, the display element 2 located within the first block...
・transfers from the state of zero to the state of dots.

At this time, each of the corresponding segment electrodes from the second block to the twelfth block, which are electrically connected to the segment electrode in the first block, is also connected to the connection line 31.
The pulse VSeg1 applied to the segment electrodes in the first block is transmitted through the segment electrodes in the first block.

However, since the common pulse VCOM3 is applied to each of the common electrodes from the second block to the twelfth block, each display element in these blocks maintains a blank state.

In this state, when all the display elements in the first block transition to the dot state, the common pulse VCOM2 applied to this first block is switched to C0M1, and at the same time, the segment pulse VSeg1 is switched to ,VS
Switched to eg2.

At the same time, the common pulse VCOM3 applied to the second block is switched to vCOM2, and the pulse applied to the segment electrodes in this second block is applied to the output terminals si and ss of the segment switch 7.
VSeg2 is switched to VSegl in this order.

As a result, each display element in this second block sequentially transitions from the acid state to the dot state.

During this time, since the common pulse VCOM1 is applied to the common electrode of the first block, the display elements in the first block maintain the dot state.

Thereby, the display elements of the second block can be cumulatively lit up from the display elements of the first block.

Furthermore, when all the display elements of the second block transition to the dot state, the common pulse of the second block is switched to VCOM1, and at the same time the segment pulse is switched to VSeg2.

Then, the common pulse of the third block is switched from C0M3 to VCOM2, and the segment pulses applied to the segment electrodes in this third block are as follows:
In the order of output terminals S1 and S5 of segment switch 7,
Switched from VSeg2 to VSegl.

During this time, since the common pulse VCOM1 is applied to the first and second blocks, the display elements located in the first and second blocks maintain the dot state.

Moreover, since the common pulse VCOM3 is applied to the fourth block and the twelfth block, each display element
It remains in a state of extinction.

As a result, the display elements in the third block are sequentially transferred to the point state, and the display elements from the first block to the third block can be lit cumulatively.

Below, in the same order, the common pulses of each block are:
VCOM3 is switched to VCOM2, and sequential segment pulses are switched from VSeg2 to VSegl.

As a result, the display elements in each block sequentially transition from the acid state to the dot state, and at the instant when the next block is reached,
The common pulse is switched from VCOM2 to VCOM1, the segment pulse is switched from VSeg1 to VSeg2, and the common pulse of the next block is switched from VCOM3 to VCOM2.

As a result, each display element in the block that is cumulatively lit can be maintained in a dot state, while display elements that are still in a non-lit state can be transitioned to a lit state.

Then, when all the display elements of the final block transition to the dot state, the common pulse applied to all blocks is VCO
The segment pulses switched to M3 and applied to all segment electrodes are switched to VSeg:2 and restored to the initial state.

As a result, all display elements are turned off. With this,
- The cycle is completed.

In summary, in the liquid crystal display device of the present invention, in order to electrically connect segment electrodes to each other, corresponding segment electrodes are sequentially connected in series in a meandering manner via division boundaries where these segment electrodes are divided into blocks. Therefore, corresponding segment electrodes can be electrically connected to each other on the same plane without crossing the connecting lines from side to side.

Moreover, since the arrangement interval of the segment electrodes is widened at the dividing boundary of the block, it is easy to form connection lines.
The present invention is particularly effective when the electrodes and connection wires are coated with a conductive thin film of indium oxide or the like.

[Brief explanation of the drawing]

Figure 1 is a wiring diagram showing the connections between segment electrodes and segment switches, and common electrodes and common switches. Figure 2 is a diagram showing the connections between segment electrodes arranged in a ring to indicate minutes, seen from the front. Pattern diagram, 3rd
The figure is a pattern diagram showing the annularly arranged common electrodes arranged opposite to the segment electrodes shown in Fig. 2, seen from the front, and Fig. 4 shows the segment electrodes shown in Fig. 2 and the common electrodes shown in Fig. 3. Figure 5 is a diagram showing a mechanical selection switch for common electrodes, and Figure 6 is a diagram showing a mechanical selection switch for segment electrodes. , Figure 7 is a logic circuit diagram showing an electronic selection switch for common electrodes, Figure 8 is a logic circuit diagram showing an electronic selection switch for segment electrodes, and Figure 9 is a liquid crystal display element. 10 is a logic circuit diagram of the first counter device, FIG. 11 is a time chart showing five types of pulses emitted from the first counter device shown in FIG. 10, and FIG. 12 is a block diagram of the first counter device. FIG. 11 is a time chart showing a composite wave obtained by combining the pulses shown in FIG. 11, and FIG. 13 is a table showing the blinking state of the liquid crystal display element due to the combination of the pulse applied to the common electrode and the pulse applied to the segment electrode. . 3...Segment electrode, 4...Common electrode, 6...
・Common switch, 7...Segment switch, 13
... Transmission gate, 14... Inverter, 15... Oscillator, 16... Frequency divider, 17...
- First counter device, 18... second counter device.

Claims (1)

[Claims] 1. In a liquid crystal display device equipped with a large number of liquid crystal display elements each having a liquid crystal interposed between a pair of opposing electrodes, a large number of segment electrodes provided corresponding to the liquid crystal display elements are arranged so that the number of electrodes in each block is the same. In addition, it is divided into a plurality of blocks in which the electrode arrangement interval between blocks is wider than the electrode arrangement interval within the block, a common electrode is provided for each block, and the corresponding segment electrodes of the solved block are electrically connected. A liquid crystal display device characterized in that segment electrodes having the same arrangement order in each block are successively connected in series in a meandering manner via division boundaries that divide the blocks.