JPH01103730A - Matrix switch device - Google Patents

Abstract

PURPOSE:To increase the number of degrees of freedom of use and to improve the transparency of the title device by earthing respective electrodes by first and second logic circuits at the time of respective electrode levels by first and second logic circuits. CONSTITUTION:When a display part on a touch panel switch 1 is depressed, a buffer memory 5 reads in output signals of logic circuits 2 and 3 as data in case of clock signal '0' and the buffer memory 6 reads in them as data in case f clock signal '1' because the clock signal to the buffer 6 passes an inverter 4. Data read in buffer memories 5 and 6 is processed by a processing circuit 8 to discriminate which display part is depressed on the touch panel switch 1, and discrimination signals of electrodes a1-a4 and electrodes b1-b4 are sent from an output port 9.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a matrix switch device that can be used, for example, as a transparent touch panel switch for inputting commands according to the display content of images or information data.

(Prior Art) Recently, matrix switch devices have been increasingly used in which, for example, a transparent touch panel switch or the like is disposed in front of a display and commands are input in accordance with the displayed content of images or information data.

FIG. 4 shows a circuit diagram of a conventional matrix switch device. In the figure, 11 is a touch panel switch, 12 is a discrimination circuit, and 13 is an output port, al.

a2. a3. aa is the vertical electrode, b, , b2° b3.
b4 is a horizontal electrode.

The electrodes a1 to a4 and the electrodes b1 to b4 are each formed of a transparent conductive material on two transparent sheets, and are normally arranged so that the intersecting portions thereof are electrically non-conductive. A protrusion-like object or a ball-like object is arranged between the transparent sheets.

When the intersecting parts of electrodes a1 to a4 and electrodes b1 to b4 are pressed, the protrusion or ball shape deforms,
Further, by stretching the transparent sheet, the crossing portions become electrically conductive.

In this way, the electrically conductive crossing portion is determined by the determining circuit 12, and a determining signal is sent from the output port 13.

The discrimination circuit 12 is configured to treat it as a malfunction when two or more intersections of the electrodes a1 to a4 and the electrodes b1 to b4 are pressed at the same time.

Therefore, since the number of intersecting electrodes a1 to a4 and electrodes b1 to b4 is 16, this matrix switch device cannot instruct switching of 16 or more.

(Problems to be Solved by the Invention) As mentioned above, the conventional matrix switch device cannot instruct switching for more than the number of crossing electrodes in the vertical direction and the electrodes in the horizontal direction. There was a problem that the range was limited.

Furthermore, to increase the number of switching instructions, the number of electrodes must be increased, and if the matrix switch is a transparent touch panel switch, increasing the number of electrodes requires increasing the number of electrodes that make up the touch panel switch. The number of protrusions or balls placed between the transparent sheets must be increased.

These protruding or ball-shaped objects impede the transparency of the transparent touch panel switch, so there is a problem when they are placed in front of a display device.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a method in which a plurality of first and second electrodes are arranged facing each other in a matrix. a first logic circuit connected to each of the first plurality of electrodes;
and a second logic circuit connected to each of the plurality of electrodes, and when the first logic circuit is detecting the level of each of the first plurality of electrodes, the second logic circuit is connected to each of the plurality of electrodes. The circuit grounds each of the second plurality of electrodes, and conversely, when the second logic circuit is detecting the level of each of the second plurality of electrodes, the first logic circuit A matrix switch device is provided, wherein each of the first plurality of electrodes is grounded.

(Embodiment) - Fig. 1 is a circuit diagram showing an embodiment of the matrix switch device of the present invention, in which 1 is a transparent touch panel switch, 2 and 3 are logic circuits, 4 is an inverter, and 5. 6 is a buffer memory, 7 is a 1/2 frequency dividing circuit,
8 is a discrimination circuit, 9 is an output port, 10 is a clock signal input terminal, al.

a2. a3. a4 is a vertical transparent electrode, bl.

b2. b3. b4 is a horizontal transparent electrode.

Logic circuit 2 is gate circuit 2G+~2G4゜2G11
~2G14 and inverters 211, 2I2°, the logic circuit 3 is composed of gate circuits 3G+~3G4.3
It is composed of G+t to 3G14 and inverters 311 and 312.

The electrodes a1 to a4 and the electrodes b1 to b4 are each formed of a transparent conductive material on two transparent sheets, and are normally arranged so that the intersecting portions thereof are electrically non-conductive. A protrusion-like object or a ball-like object is arranged between the transparent sheets.

The above-mentioned two transparent sheets provided with electrodes a1 to a4 and electrodes b1 to b4 are touch panel switch 1, and this touch panel switch 1 is placed on the front side of the display device, and the user can see the display through the touch panel switch 1. You can use the matrix switch device while looking at the device.

When the vicinity of the intersection of electrodes a1 to a4 and electrodes b1 to b4 is pressed, the protrusion-like object or ball-like object is deformed,
Furthermore, by stretching the transparent sheet, the desired intersecting portions become electrically conductive.

Electrodes a1 to a4 are gate circuit 2G+ in logic circuit 2
~2Ga, and the other ends of these gate circuits 2G+~2Ga are connected to the buffer memory 5, respectively.

Furthermore, one end of the gate circuits 2G+ to 2G4 is connected to the other ends of the gate circuits 2G11 to 2G14, respectively, whose negative ends are grounded.

The input terminal 10 is connected to the gates of the gate circuits 2G+ to 2G4 through the inverters 4 and 2t+ in series, and the input terminal 10 is connected to the gates of the gate circuits 2G+ to 2G4 through the inverter 212.
Each of the gate circuits 2 G 11 to 2 G +a is connected to the gate.

On the other hand, the electrodes b1 to b4 are connected to one end of each of gate circuits 3G+ to 3Ga in the logic circuit 3, and the other ends of these gate circuits 3G+ to 3Ga are connected to the buffer memory 6, respectively.

Furthermore, one end of the gate circuits 3G+ to 3G4 is connected to the other ends of the gate circuits 3G11 to 3G14, respectively, whose negative ends are grounded.

The input terminal 10 is connected to the gates of the gate circuits 3G11 to 3G14 through the inverters 4 and 312 in series, and further connected to the gates of the gate circuits 3G+ to 3Ga through the inverter 3I+.

The clear and clock terminals of the buffer memory 5.6 are both connected to the input terminal 10, and the buffer memory 5.6 is further connected to the input terminal 10.
The respective output terminals of 6 are connected to a processing circuit 8, and this processing circuit 8 is connected to the input terminal 10 via a 1/2 frequency dividing circuit 7.

FIG. 2 shows a display section of the touch panel switch 1, and FIG. 3 shows a time chart.The operation of the matrix switch device of the present invention will be explained with reference to FIGS. 1 to 3.

For example, the display I of the touch panel switch 1 shown in FIG.
When pressed, electrode a1 and electrode b1 . Electrode a1 and electrode b2. The four intersections of electrode a2 and electrode b1° and electrode a2 and electrode b2 are electrically connected to each other.

At this time, the clock signal shown in FIG. 3(A) is supplied to the input terminal 10, and when this clock signal is O, the gate circuits 2G+ to 2Ga in the logic circuit 2 are turned off.
Gate circuits 2G11 to 2G14 are turned on. Similarly,
Gate circuits 3G1 to 3G4 in the logic circuit 3 are on,
Gate circuits 3G11 to 3G14 are turned off.

Therefore, the display ■ of touch panel switch 1 is pressed,
Moreover, when the clock signal is O, electrodes a1 and a2 are grounded via gate circuits 2G++ and 2G+2, respectively, so that both electrodes b1 and b2 become zero.

From the above, it is clear that the buffer memory 6 is smaller than the logic circuit 3.
The sending signal to the electrodes becomes 0011 when expressed in bits in order from electrodes b1 to b4.

Next, in the above state, when the clock signal is inverted to 1,
Gate circuit 2G+~2G4.20++~2G14.3G
I~3Ga and 3G11~3G14 are on, of
f relationship is reversed.

Therefore, the electrodes b1 and b2 are respectively connected to the gate circuit 3G+
+, 3G+2, so electrodes al and a2
and are both O.

From the above, from the logic circuit 2, the buffer memory 5
The signal sent to the electrodes is 0011 when expressed in bits in order from electrodes a1 to a4.

The output signals of the logic circuits 2 and 3 are read by the buffer memory 5.6 when the clock signal supplied to the buffer memories 5, 6 is O, but the clock signal to the buffer memory 6 is read by the inverter. 4, when the clock signal is 0, the buffer memory 5 reads data, and when the clock signal is 1, the buffer memory 6 reads data alternately.

The processing circuit 8 uses the data read by the buffer memories 5 and 6 to determine which display part of the touch panel switch 1 has been pressed, and the determination result is sent to the frequency dividing circuit 7 shown in FIG. 3(B). Figure 3 (
As shown in C), electrodes a1 to a4 and electrodes b1 to b
At the same time, the output port 9 sends out a discrimination signal for 4 and 4.

In this example, the number of electrodes in the vertical and horizontal directions was four each, but the number of electrodes is not limited to this, and a transparent touch panel switch was used, but a matrix switch device in which multiple switches open and close at the same time. Of course, the present invention can be applied to.

(Effects of the Invention) According to the present invention, since more switching can be performed than the number of intersections of vertical and horizontal electrodes of a touch panel switch, there is an advantage that the degree of freedom in using the same touch panel switch can be expanded.

Furthermore, it is possible to reduce the number of protruding objects or ball-like objects arranged between the two transparent sheets constituting the touch panel switch, improving the transparency of the touch panel switch and simplifying manufacturing. It has its features.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an embodiment of the matrix switch device of the present invention, Fig. 2 is a display section of a touch panel switch 1, Fig. 3 is a time chart, and Fig. 4 is a circuit diagram of a conventional matrix switch device. Each is shown below. 1... Transparent touch panel switch, 2... Logic circuit (first logic circuit), 3... Logic circuit (second logic circuit), 4.21+, 212.31+
, 312... Inverter, 5.6... Buffer 7 memory, 7... 1/2 frequency divider circuit, 8... Discrimination circuit, 9
...Output capo-1 to 1o...Clock signal input terminal, a1 to a4...Vertical transparent electrode, b1 to b4
... Lateral electrode, 2G+~2G4.2G11~2G
14.3G+-3G4.3GII to 3G14...Gate circuit.

Claims (1)

[Claims] a matrix switch in which a plurality of first and second electrodes are arranged facing each other in a matrix, and an intersection of the first and second electrodes performs a switching action;
a first logic circuit connected to each of the plurality of electrodes, and a second logic circuit connected to each of the second plurality of electrodes, the first logic circuit being connected to the first logic circuit. When detecting the level of each of the plurality of electrodes, the second logic circuit grounds each of the second plurality of electrodes, and conversely, the second logic circuit grounds each of the second plurality of electrodes. A matrix switch device, wherein the first logic circuit grounds each of the first plurality of electrodes when detecting the level of each of the electrodes.