JPH0646337A - Key matrix control device - Google Patents

Abstract

PURPOSE: To prevent erroneous operations of a function key by controlling the drive of key matrix at a main body, while using a lock function key provided at a transmitter for remote control. CONSTITUTION: When a user depresses the lock function key of a transmitter 30, the transmitter 30 transmits a lock function signal through an infrared diode D1. A reception part 20 receives the lock function signal through a photodiode D2 and transmits it to a microcomputer 40. When the lock function signal is inputted, the microcomputer 40 respectively outputs a switching signal and a lock function display signal from terminals A and B. Thus, a transistor Q1 of a switching part 60 is turned on, switches SW1-SW5 of a switching part 70 are turned off, and the LED of a display part 50 is emitted. Therefore, a key scan pulse is cut by SW1-SW5, and the state of function under execution is kept continuously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a remote control transmitter having a "lock" function key in an electronic or electric product for controlling various functions by using a key matrix of a main body and a remote control transmitter. The present invention relates to a key matrix control device capable of controlling driving of a key matrix of a main body.

[0002]

2. Description of the Related Art With the development of electrical and electronic technologies, and in order to meet the convenience required by users, electrical and electronic products currently being manufactured are key matrices of the main body as means for controlling various functions. Not only that, it uses a remote control transmitter. FIG. 1 shows an example of a conventional device in which various functions are controlled by a key matrix and / or a remote control transmitter in a general electric / electronic product.

Microcomputer (hereinafter, microcomputer) 4
0 applies a key scan pulse to the key matrix 10 through a large number of output terminals a, b, c and d. here,
One of the many keys provided in the key matrix 10
When one of the keys is pressed, the microcomputer 40 recognizes the signal of the key and controls the device to perform the corresponding function.
Further, the microcomputer 40 is connected to the receiving unit 20 including the photodiode D2, and various functions of the device can be controlled according to a signal applied from the receiving unit 20. At this time, the receiver 20 receives the infrared signal transmitted from the remote control transmitter 30 and transmits it to the microcomputer 40.

The transmitter 30 is a key matrix 10 of the main body.
But with a key matrix array with reduced or expanded functionality. If you press one of the many keys on the transmitter 30 key matrix,
An infrared signal corresponding to the pressed key is generated through the infrared diode D1, and this infrared signal is received by the receiving unit 2.
It is received by the zero photodiode D2.

In such a conventional device, the lock (l
A lock function key for performing the (ock) function is usually provided in the key matrix of the main body. here,
The lock function refers to a function in which, when the lock function key is pressed, the function currently being executed is continuously performed even if another function key is pressed. Such a lock function is very useful for preventing the user from changing the function by deciding one function required and then driving another function key due to a mistake or the like. However, in the case of electric and electronic products used for ordinary consumer use, a child sometimes accidentally presses the key matrix of the main body. That is, when the child improperly presses the lock function key of the key matrix, the electronic / electrical product performs the lock function, so that the key matrix and / or the remote control transmitter cannot operate the other function keys, which causes a malfunction. There is also the case of misunderstanding. On the other hand, if it is not locked, the child may turn off the power or raise the volume through the key matrix of the TV while watching the TV.

As described above, the conventional device has a problem that an undesired function is executed due to a mistake of a child or the device is erroneously recognized as a failure.

[0007]

SUMMARY OF THE INVENTION Accordingly, the object of the present invention is currently achieved by further providing the remote control transmitter with means for performing all locking functions, including the locking function keys provided in the key matrix. Another object of the present invention is to provide a key matrix control device which operates so as to be continuously performed without being changed by the operation of another key.

[0008]

To achieve the above object, the present invention comprises, in a device with a key matrix, a key for performing at least a locking function,
Remote adjustment means having a plurality of function keys for remotely controlling the device, and applying a key scan pulse to the key matrix to control the device according to an input signal from the key matrix and / or the remote adjustment means. And a blocking means coupled between the control means and the key matrix for blocking a key scan pulse applied from the control means to the key matrix in response to a lock signal from the remote adjusting means. The key matrix controller is characterized by the following.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 2 shows a preferred embodiment of the key matrix control device according to the present invention. The key matrix control circuit of this embodiment is the key matrix 1
0, a receiving unit 20, a microcomputer 40, a display unit 50 and a main body including a switching circuit 100, and a transmitter 30 for generating a remote control signal. The transmitter 30 operates the same as the transmitter used in a conventional key matrix controller, but with a new function added to the lock function key. When the lock function key of the transmitter 30 is pressed, an infrared signal corresponding to the lock function signal is generated through the infrared diode D1 and transmitted to the receiver 20 of the main body. The receiving unit 20
The receiver is the same as the receiver used in the conventional key matrix controller, and receives the infrared signal transmitted from the transmitter 30 by the photodiode D2 and transmits the lock function signal to the microcomputer 40. Then, the microcomputer 40 causes the receiving unit 20 to
A "high" level signal is output through the output terminals A and B according to the lock function signal from. The switching circuit 100 is coupled to the output terminal A, and the display unit 50 is coupled to the output terminal B. The display unit 50 is configured such that the output signal of the B terminal of the microcomputer 40 is applied to the base terminal of the switching NPN transistor Q2, the collector terminal is connected to the power supply terminal through the light emitting diode LED, and the emitter terminal is grounded. There is. Therefore, if a high level lock function display signal is applied from the B terminal, the light emitting diode LED emits light to indicate that the lock function is being performed.

The switching circuit 100 includes a microcomputer 40.
And a plurality of switches SW1 to S for controlling the key scan pulse applied to the key matrix 10 from the microcomputer 40 and the first switching unit 60 including the switching transistor Q1.
The second switching unit 70 includes W5. The first switching unit 60 is connected to the terminal A of the microcomputer 40,
The transistor Q1 is driven according to the switching signal output from the terminal A. The second switching unit 70 is composed of a large number of switches SW1 to SW5, and is coupled between the key scan pulse output terminals a to e of the microcomputer 40 and the key matrix 10 to form the switches SW1 to SW5.
The operation of SW5 is controlled according to the switch control signal supplied from the first switching unit 60. That is, if the switch control signal from the first switching unit 60 is low level, the switching SW1 to SW of the second switching unit is
When the switch 5 is in the "off" state, the key scan pulse from the microcomputer 40 to the key matrix 10 is cut off, and the switch control signal becomes high level, the switches SW1 to SW1.
5 becomes the "on" state and the key scan pulse is applied.

More specifically, when the user does not press the lock function key of the transmitter 30, a low-level switching signal from the A terminal of the microcomputer 40 is transmitted to the transistor Q1 of the first switching section 60. Applied to the base terminal. Then, the transistor Q1 is turned off, so that the first switching unit 60 outputs a high-level switch control signal to cause the second switching unit 7 to operate.
0 to each switch. The switches SW1 to SW5 are kept in the ON state according to the high level switch control signal, whereby the key scan pulse output from the output terminals a to e of the microcomputer 40 is applied to the key matrix 10. Therefore, the microcomputer 40 can recognize the pressed key among the keys of the key matrix 10. Further, a low-level lock function display signal is output from the B terminal of the microcomputer 40 and applied to the base terminal of the transistor Q2 of the display section 50. Then, since the transistor Q2 is turned off, the light emitting diode LED is also turned off and no light is emitted. Thus, it is displayed that the lock function key of the transmitter 30 is not pressed.

On the other hand, when the user presses the lock function key of the transmitter 30, the transmitter 30 transmits the lock function signal through the infrared diode D1. Then, the receiver 20 receives the lock function signal through the photodiode D2 and transmits it to the microcomputer 40. When the lock function signal is input from the receiver 20, the microcomputer 40 outputs a high level switching signal and a lock function display signal from the A terminal and the B terminal, respectively. Therefore, the transistor Q of the first switching unit 60 connected to the A terminal is
1 is turned on, and the low level switching control signal is applied to the second switching unit 70. Then, the second
A low level switching control signal is applied to the switches SW1 to SW5 of the switching unit 70 to turn them off. Thus, when applied to the key matrix 10 from the output terminals a to e of the microcomputer 40, the key scan pulse is cut off by the switches SW1 to SW5. Then, even if any key of the key matrix 10 is pressed, the microcomputer 40 cannot recognize that the key has been pressed, and the state of the function being executed is continuously maintained. Further, the microcomputer 40 outputs a high level lock function display signal at the B terminal and applies it to the base terminal of the transistor Q2 of the display section 50. Then transistor Q
Since 2 is turned on and the light emitting diode LED emits light, the user can easily recognize that the lock function is being performed.

Although the present invention has been described above through specific embodiments, this is merely an example and does not limit the present invention.

[0014]

As described above, the key matrix control device according to the present invention is being operated by controlling the drive of the key matrix of the main body using the lock function key provided in the remote control transmitter. The function is prevented from being changed by the operation of the key matrix, and it is possible to prevent the possibility that the function key may be erroneously operated due to an error or the like and the inconvenience in use due to this.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a conventional device.

FIG. 2 is a block diagram showing an embodiment of a key matrix control device according to the present invention.

[Explanation of symbols]

10 ... Key matrix, 20 ... Receiving part, 30 ... Transmitter, 40 ... Microcomputer, 50 ... Display part, 60 ... First switching part, 70 ... Second switching part, 100 ... Switching circuit, Q1, Q2 ... Transistor, LED … Light emitting diode, D1… Infrared diode, D2… Photodiode

Claims (4)

[Claims] 1. A device with a key matrix, comprising at least a key for performing a locking function, remote adjustment means having a number of function keys for remotely controlling the device, and key scan pulses on the key matrix. Is applied,
Control means for controlling the device in response to an input signal from the key matrix and / or remote adjusting means; and a control means coupled between the control means and the key matrix for responding to a lock signal from the remote adjusting means. A key matrix control device comprising: a blocking means for blocking a key scan pulse applied from the control means to the key matrix. 2. The disconnecting means comprises a first switching means having a plurality of switches for controlling a key scan pulse applied to the key matrix from the control means, and a lock signal from the control means to the remote adjusting means. 2. The key matrix control device according to claim 1, further comprising: second switching means for applying a signal for shutting off a large number of switches to the first switching means in response to the second switching means. 3. The key according to claim 1 or 2, further comprising means for displaying a locked state in response to a control signal from the control means by the lock signal of the remote adjusting means. Matrix controller. 4. The key matrix control device according to claim 2, wherein the second switching means is composed of a switching transistor.