JPS595966A - Display device - Google Patents

Abstract

PURPOSE:To make it possible to perform simple and accurate check as compared to a case using oscilloscope, by directly checking the signal of a personal computer by using a monitor television receiver. CONSTITUTION:The signal of a personal computer is applied to plural input terminals 1, 2, 3 which are, in turn, connected to a mixing circuit 7 through gate circuits 4, 5, 6. On the other hand, a gate pulse is generated from a decoder 8 to be applied to the gate circuits 4, 5, 6 where subjected to time sharing and applied to the mixing circuit 7 to be applied to the video amplifier of a television receiver from a terminal 9. The horizontal synchronous signal of the television receiver is applied to a terminal 10 and a vertical synchronous signal thereof is applied to a terminal 11. The horizontal synchronous signal is applied to a counter 13 through a change-over switch 12 and the vertical synchronous signal is applied through a change-over switch 13 to carry out reset. The output of the counter 13 is applied to the decoder 8 and a gate pulse is outputted as the output thereof. As the result, display is obtained on the image surface of the television receiver and the investigation of the personal computer can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a display device using a television receiver that can be used in place of an oscilloscope.

Conventional configurations and their problems Generally speaking, an oscilloscope is used when considering equipment that generates television broadcast signals, which is composed of personal computers and digital circuits. The drawback is that it is not known whether the image is synchronized with the television synchronization signal or where it will be displayed on the cathode ray tube screen of the television receiver.

OBJECTS OF THE INVENTION The present invention is intended to enable examination of personal computer signals using a cathode ray tube of a television receiver for direct monitoring.

, Structure of the Invention The present invention adds a plurality of signal input terminals to a mixing circuit through respective gate circuits, generates a pulse signal that divides a cathode ray tube screen vertically and horizontally based on a synchronization signal, and The present invention is characterized in that a pulse signal is applied to the gate circuit, and the signals successively input to each of the plurality of signal input terminals are gated in a time-division manner and are displayed in a divided manner on a cathode ray tube screen.

Description of examples Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, signals from a personal computer or the like are applied to a plurality of input terminals 1, 2.3. This terminal 1,
For example, the signals applied to 2.3 are as shown in Fig. 2 a, b, c.
This is the signal shown in

This input terminal 1.2.3 is connected to a mixing circuit 7 via gate circuits 4, 5, 6. On the other hand, a gate pulse is generated from the decoder, applied to the gate circuits 4 and 6, time-divided, applied to the mixing circuit 7, and applied from the terminal 9 to the video amplifier of the television receiver. A horizontal synchronizing signal of the television receiver is applied to a terminal 10, and a vertical synchronizing signal is applied to a terminal 11. Horizontal synchronization signal is selector switch 1
2 to the counter 13, and the selector switch 13
Reset by applying vertical synchronization signal via . The output of the counter 13 is applied to the decoder 8, and the gate pulses shown in FIG. 3a, b, and c are generated as its output. As a result, a display as shown in FIG. 4 is obtained on the screen of the television receiver, and a personal converter can be studied.

The display shown in FIG. 5 can be obtained by switching the changeover switches 12 and 14, applying a signal with a frequency 626 times the horizontal frequency from the locked oscillator 16 to the counter, and resetting the counter 13 with the horizontal synchronizing signal. The synchronization signal can be obtained directly from the personal beater signal source or separately from the composite synchronization signal.

Effects of the Invention As described above, according to the present invention, signals from a personal computer can be directly checked using a monitor television receiver, so checking can be performed more easily and accurately than using an oscilloscope.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a display device according to an embodiment of the present invention, FIGS. 2 and 3 are waveform diagrams for explaining the device, and FIGS. 4 and 6 are diagrams showing display states of the device. It is. 1.2.3...Input terminal, 4,5.6...
...Gate circuit, 7...Mixed circuit, 10,11
・・・・・・Sync signal input terminal. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 0゜Figure 5

Claims (1)

[Claims] A plurality of signal input terminals are respectively applied to a mixing circuit via a gate circuit, a pulse signal is generated to divide the cathode ray tube screen vertically or horizontally using the synchronization signal as a reference, and this pulse signal is applied to the above gate circuit. A display device characterized in that the signals successively input to the plurality of signal input terminals are gated in a time-division manner and are displayed in a divided manner on a cathode ray screen.