JPH01173121A - Data input device - Google Patents

Abstract

PURPOSE:To detect many switches by securing the parallel connection among the key matrix lines of rows and columns of each unit block matrix and the rows and columns of another unit block matrix via diodes and using the block and key matrix scan signals for detection of switches. CONSTITUTION:A unit key matrix block consists of the row a/column b key matrix lines and the switches set at the intersecting points of said matrix lines. Then a block matrix consists of plural unit key matrix blocks. The key matrix lines of rows and columns of each unit block matrix are connected in parallel to the rows and columns of another unit key matrix block via diodes Di. There fore (1/2n+1) pieces of unit matrix blocks are obtained at maximum in case (n) shows an even number together with [1/2(n+1)+1]X[1/2(n-1)+1] pieces of unit matrix blocks obtained in case (n) shows an odd number respectively when both block scan output and input are set. In such a way, the number of switches to be detected can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an operation panel for operating a television or video, and an input device for inputting a large amount of data.

Prior Art FIG. 3 (IL) shows the configuration of a conventional key matrix circuit, and FIG. 3 (b) shows the detection of a switch based on output scan data and input scan data.

In Figure 4 (IL), only switch 11 in Figure 3 ia) is ON.
In the key scan input/output time charts for each key scan, only the pulse of the terminal (2) of the output line is received by the terminal (2) of the input line, and it can be detected that the switch 11 is turned on based on the pulse timing of the output and input.

Figure 4(b) is an input/output time chart for each key scan when only the switch 33 is turned on.
The pulse of and the pulse of the output line station terminal O are received at the input line terminal ■, and the pulse of the output line terminal O causes
The C matrix block in which the switch 33 is arranged can also detect the position of the switch 33 within the C matrix block by the pulse at the output line terminal (2).

Problems to be Solved by the Invention However, in the above-mentioned conventional key matrix circuit, if the number of switches is increased further, the number of input or output key matrix signal terminals must be increased. The present invention solves such conventional problems, and has an excellent key matrix circuit that can detect a larger number of switches than a conventional key matrix circuit, provided that the number of key matrix scan input/output terminals is the same. A data input device is provided.

Means for Solving the Problems In order to achieve the above object, the present invention constitutes a unit key matrix block by key matrix lines in Ka rows and columns and switches arranged at the intersections of the key matrix lines. Configure a block matrix with multiple pieces,
The key matrix lines in the rows and columns of each unit block matrix are connected in parallel to the rows and columns of the other unit block matrices via diodes, and switches are detected by block scan signals and key matrix scan signals. It is structured as follows.

Effects The present invention has the following effects due to the above structure. That is, in the past, only n+1 unit matrix blocks could be configured for n block scan output terminals, but according to the present invention, by setting the pro-rough scan output and block scan input, a maximum of n=even number blocks can be configured. Case 1 / (-n+1)X (-n+1') If n=odd number (-(n+1)+1)X(-(n-1)+1)
It is possible to construct a unit matrix block of many animals, and to increase the number of switches to be detected.

Embodiment FIG. 1 (IL) shows a key matrix circuit configuration of an embodiment of the present invention, and FIG. 1 (b) is a correlation table of switches according to scan output data and scan input data. Terminals ■ to ■ are key scan output terminals, and terminals ■ to ■ are key scan input terminals. The position of the key in each unit matrix block can be detected by the scan signals of these key scan input and output terminals of (1) to (4). In addition, terminal ■,
Q is a block scan output terminal, and terminals Q and Q are block scan input terminals. The position of the unit matrix block can be detected by the signals of the professional scan output terminals of these ■～O and the key scan input and output terminals of above ■～■, and the key position detection within each unit matrix block mentioned above. By unit matrix block position detection, O
N switch can be detected. Also, each unit block matrix in FIG. 1(C)~! The key matrix lines of the rows and columns of are connected in parallel to the rows and columns of each other unit block matrix via diodes D.

Figure 2 (&) is a time chart of each scan output and each scan input when only switch 6 is OFF in Figure 1 (&), and only the scan signal of the key scan output terminal ■ is detected to the scan input terminal ■. And since no scan signal is detected at the block scan input and key scan input for the block scan output, Figure 1 (
The switch 6 that intersects the matrix lines of ■ and ■ in the matrix profile of C) is detected.

FIG. 2 (1)) is the switch 17 in FIG. 1 fa).
This is a time chart of each scan output and each scan input when only 1 is turned on, and the scan signals of the key scan output terminal 2 and the block scan output terminal 2 can be detected to the key scan input terminal 2. In this case, a scan signal is detected at the key scan input terminal ■ for the block scan output terminal ■, so the switch crosses the matrix lines ■ and ■ in the D matrix block in FIG. 1(C).
Sochi 17 can be detected.

FIG. 2 ((1) is the switch 11 in FIG. 1(a))
This is a time chart of each scan output and each scan input when only 3 is turned on, and scan signals can be detected at the key scan input terminal ■ and block scan input terminal O for the key scan output terminal ■ and block scan output terminal ■. . In this case, a scan signal is detected at the block scan input terminal O for the block scan output terminal (■), so the two matrix blocks shown in FIG. The reswitch 113 can be detected by detecting the scan signal by human power.

In this way, according to the above embodiment, a large number of switches can be detected.

Effects of the Invention As is clear from the above embodiments, the present invention has the following effects.

(1) Conventionally, only n+1 unit matrix blocks could be configured for n block scan output terminals, but according to the present invention, unit matrix blocks can be configured for n = even number and n = odd number. and many switches can be configured.

(2) In addition, when the number of switches is the same, there are fewer diodes and input/output terminals than in the past, and the production cost is lower.

[Brief explanation of the drawing]

FIG. 1 (&) is a key matrix circuit diagram in one embodiment of the present invention, and FIG. 1 (b) shows the correlation between key scan person, output data, and switch position in the key matrix circuit of FIG. 1 (IL). FIG. 1 (to) is a diagram showing the pro-work, FIG. 2 (IL) is a timing chart of key scan input/output when switch 6 is turned on in the key matrix circuit of FIG. 1 (IL), and FIG. b) is shown in Figure 1 (
&) Turn on switch 17 in the key matrix circuit
Figure 2 (C) is a timing chart of key scan input and output when the switch 113 is turned on in the key matrix circuit diagram of Figure 1 (&); Figure (IL) is the key matrix circuit diagram in the conventional example, and Figure 3 (b) is the key matrix circuit diagram in the conventional example.
Figure (IL) Key Matrix) Diagram showing the correlation between key scan person, output data, and switch position in the IJ circuit diagram. Figure 4 (IL) shows the key matrix circuit diagram in Figure 3 (IL) when switch 11 is turned on. FIG. 4 (1)) is a timing chart of the key scan function and output when the switch 33 is turned ON in the key matrix circuit of FIG. 3 (IL). ■〜■・・・・・・Key scan output terminal, ■〜■・・・
...Key scan input terminal, ■, Q...Block scan output terminal, Q, Q...Block scan input terminal. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 2 (Figure 2 Cb) ■ □ Figure 2 (3rd section (b)) Figure 4 (-Tamahiro-2 Short (Ni)

Claims (1)

[Scope of Claims] A unit key matrix block is constituted by the key matrix line in row a and column b and a switch arranged at the intersection thereof, and a block matrix is constituted by a plurality of these unit key matrix blocks, and each unit The key matrix lines of the rows and columns of the block matrix are connected in parallel to the rows and columns of each other unit block matrix via diodes,
A data input device configured to detect switches using a block scan signal and a key matrix scan signal.