KR20000040886A - Key lock apparatus for television - Google Patents

Abstract

PURPOSE: A key lock apparatus for television is provided to lock up the key buttons on the front mask of TV in order to prevent others except a viewer from controlling the television. CONSTITUTION: A key lock apparatus for television includes a remote controller(102), a microcomputer(103), and a key button ground(105). The microcomputer(103) determines whether a key lock signal is input from the remote controller(102), and according to the result, whether only the remote controller(102) is used for controlling is determined. The key button ground(105) locks up the key buttons(101) on the front mask when the key lock signal is applied. The key buttons(101) further includes plurality of switches connected in parallel.

Description

Key locking apparatus for TV system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key lock device of a television for determining the lock of a key button mounted on a front mask in a television receiver, and more particularly, to a key lock device of a television that allows a control signal to be input only through a remote controller as necessary. will be.

In general, as shown in FIG. 1 as a means for inputting control signals such as power on / off, channel change, volume adjustment, and the like to a television system, the front mask key button 1 and a remote controller ( 2) is provided. In Fig. 1, reference numeral 3 denotes a microcomputer for determining the operation of the television system according to the control signals input from the front mask key button 1 and the remote controller 2.

Since such a television receiver has two means for inputting a control signal, there is a problem that a dispute may arise due to a problem of channel selection or power on / off when a large number of people watch television at the same time.

An object of the present invention for solving the above problems is to lock the key button of the front mask by the selection when the viewer inputs a control signal using the remote control so that the control is not performed by other people. To provide a key lock device of a television.

1 is a block diagram showing means for inputting a control signal into a general television system;

2 is a block diagram of a general television system to which the present invention is applied.

3 is a circuit diagram showing the configuration of a key lock device for a television according to the present invention.

4 is a flowchart showing the operation of the key lock device of the television according to the present invention.

Explanation of symbols for main parts of the drawings

101: front mask key button 102: remote control

103: microcomputer 104: infrared receiver

105: key button ground

A first feature of the present invention for achieving the above object is a microcomputer for determining whether a key lock signal is input from a remote controller and determining whether to receive a control signal for controlling the operation of the television system only from the remote controller according to the result. And a key button grounding unit configured to lock the front mask key button mounted on the front mask of the television receiver when the microcomputer determines that the key lock signal is input from the remote controller. .

At this time, according to an additional feature of the present invention, the front mask key button comprises a plurality of switches connected in parallel. In addition, the key button ground part is turned on when the output terminal of the front mask key button and the collector terminal are connected and a key lock is to be performed by receiving a control signal of the microcomputer through a base terminal. And an NPN transistor for grounding the output terminal of the button.

EMBODIMENT OF THE INVENTION Hereinafter, the key lock apparatus of the television which concerns on this invention, and preferable embodiment of the method are demonstrated in detail based on attached drawing.

2 is a block diagram of a general television receiver to which the present invention is applied, in which reference numeral 1 denotes an antenna, and 2 denotes an amplification of a radio frequency signal (hereinafter referred to as RF) received through the antenna 1. 3 denotes an RF amplification unit, and 3 denotes an intermediate frequency (IF), which is a mixture of a radio frequency signal output from the RF amplification unit 2 and an oscillation frequency signal output from the local oscillation circuit 17 to be described later. The first mixer outputs a signal.

Further, reference numeral 4 denotes an IF amplifier section for amplifying the intermediate frequency signal output from the first mixer 3, and 5 denotes an image intermediate frequency signal PIF in the intermediate frequency signal output from the IF amplifier section 4. And a P / S separator for separating the voice intermediate frequency signal SIF, and 6 represents a voice detector for detecting a voice signal from the voice intermediate frequency signal SIF output from the P / S separator 5. 7 denotes an image detector for detecting an image signal from an image intermediate frequency signal PIF output from the P / S separator 5.

In addition, reference numeral 8 denotes a remote control device that allows a viewer to select a desired channel or to select each mode of the television, that is, a TV / AV mode, and 9 denotes an infrared signal from the remote control device 8. 10 shows a receiver for converting a conventional code signal, 10 denotes a channel memory in which predetermined channel data is stored, and 11 denotes a microprocessor which controls the entire system in accordance with an input signal from the remote controller device 8.

In addition, reference numeral 12 denotes a screen display for overlapping and outputting a character or a picture on a screen on which a broadcast signal is output separately from the broadcast signal according to the control signal of the microprocessor 11 (On Screen Display). (Hereinafter referred to as OSD), and 13 denotes a PWM generator for generating a predetermined pulse width modulation (PWM) signal according to a control signal from the microprocessor 11, and 14 denotes the above. An integration circuit for integrating the PWM signal output from the PWM generator 13 to generate a predetermined level signal is shown.

In this case, when the viewer selects a predetermined channel using the remote controller device 8, the microprocessor 11 reads out channel data corresponding to the channel selected by the viewer from the channel memory 10 and then based on the selected channel. By controlling the PWM generator 13 to generate a predetermined PWM signal, the PWM signal is output as a voltage control signal corresponding to the channel selected by the viewer through the integrator circuit 14.

Further, reference numeral 15 denotes an auto fine tuning (AFT) circuit 15 as provided for a precise tuning operation, and 16 denotes a voltage signal applied from the integration circuit 14. An adder for adding a voltage signal applied from the AFT circuit 15 is shown, and 17 represents a local oscillating circuit for outputting a predetermined oscillation frequency.

In addition, reference numeral 18 controls the amplification degree of the above-described RF amplifier 102 and the IF amplifier 4 on the basis of the level of the image signal detected by the image detector 7, the image detector ( The following shows an automatic gain control circuit (AGC) that controls the video signal output level from 7).

On the other hand, reference numeral 19 denotes an external AV device such as a VCR or a laser disc player, and 20 denotes the voice detector 6 and the image detector 7 according to the switching signal from the microprocessor 11 described above. A first switching section for selectively outputting audio and video signals from and external audio and video signals from the external AV device 19 is shown.

Although reference numeral 23 is not shown for the image signal output from the first switching unit 20, the color, tint, and brightness are in accordance with the control signal from the microprocessor 11. A video processing unit which processes (Brightness) and the like and outputs R (Red), G (Green), and B (Blue) signals corresponding to the video signal.

The RGB signal output from the image processor 23 is output by mixing RGB and OSD blanking signals Y ′, which are output signals of the OSD generator 12 described above, in the second mixer indicated by reference numeral 24. Reference numeral 25 denotes a CRT driving unit for driving the CRT based on the RGB signal output from the mixer 24.

In addition, reference numeral 21 denotes a base, treble, and volume according to a control signal from the microprocessor 11 although not shown for the voice signal output from the first switching unit 20. A voice processing unit for executing voice processing such as a volume), and 22 denotes a voice amplifying unit for amplifying and outputting the voice signal processed by the voice processing unit 21 to a speaker.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, a configuration of a key lock device for a television according to the present invention will be described with reference to FIG. 3.

In FIG. 3, reference numeral 101 denotes a front mask key button having a plurality of switches sw1, sw2, ... sw5 mounted on the front mask of the television receiver, 102 denotes a remote control carried by the viewer, and 103 In response to the control signals of the front mask key button 101 and the remote control 102, the operation of the television system is controlled, and at the same time it is determined whether a key lock signal is input from the remote control 102. A microcomputer indicates that a control signal is not input through the button 101, 104 denotes an infrared receiver which receives an infrared control signal output from the remote controller 102 and provides the microcomputer 103 to the microcomputer 103, and 105 denotes the microcomputer. A key button grounding portion for grounding the front mask key button 101 in accordance with the control signal of 103 is shown.

The front mask key button 101 is provided with a plurality of switches sw1, sw2, ... sw5 and outputs signals of different voltages to the microcomputer 103 according to a switch selected. In addition, the key button ground portion 105 is connected to the collector terminal of the output of the front mask key button 101 and the NPN transistor (NPN) transistor that receives the control signal of the microcomputer 103 through the base terminal ( TR1).

The operation of the key lock device of the television according to the present invention having the above configuration will be described with reference to the flowchart of FIG.

First, when the operation of the television receiver is started, the microcomputer 103 controls the operation of the television system in accordance with a control signal input from the front mask key button 101 or the remote controller 102. At this time, the microcomputer 103 continuously determines whether a key lock button of the remote controller 102 is selected and a key lock signal is input (see S101).

At this time, when the key lock button is selected, the microcomputer 103 recognizes the key lock signal (see S102), and drives the key button grounding unit 105 to ground the output terminal of the front mask key button 101. (See S103).

In the above, when the N & P transistor TR1 of the key button ground unit 105 is turned on by the control signal of the microcomputer 103, no matter which switch is selected in the front mask key button 101, the microcomputer 103 is selected. 0V is output to prevent the output signal of the front mask key button 101 from being recognized.

Thereafter, the microcomputer 103 continuously determines whether a key lock release button of the remote controller 102 is selected and a key lock release signal is input (see S104).

In this case, when the key lock release button is selected, the microcomputer 103 recognizes the key lock release signal, releases the operation of the key button ground unit 105, and outputs the output signal of the front mask key button 101. Thus allowing the television system to be controlled.

The key lock device of the television of the present invention as described above has the effect that the convenience of the user can be improved by preventing other people from performing channel conversion or power-off while watching one program.

While the invention has been shown and described with respect to particular embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention as set forth in the claims. Anyone can see it easily.

Claims (3)

A microcomputer that determines whether a key lock signal is input from the remote controller and determines whether to receive a control signal for controlling the operation of the television system only from the remote controller according to the result; And a key button grounding unit configured to lock the front mask key button mounted on the front mask of the television receiver when the microcomputer determines that the key lock signal is input from the remote controller. The method of claim 1, And the front mask key button comprises a plurality of switches connected in parallel. The method according to claim 1 or 2, The key button ground is turned on when the output terminal of the front mask key button and the collector terminal are connected and the key lock is to be performed by receiving a control signal of the microcomputer through a base terminal. Key lock device of a television comprising an NPN transistor to ground the output terminal.