JPS6344860Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a cathode ray tube display device that automatically determines the polarity of horizontal and vertical synchronizing signals supplied together with display information from the outside and performs polarity matching.

BACKGROUND ART In recent years, with the rapid development of electronic technology, information processing devices such as microcomputers and word processors have come into widespread use. These information processing devices generally use a cathode ray tube display device (monitor) as one of the terminals. In this case, the information processing device and the cathode ray tube display device are usually connected by a cable with connectors on both ends, and the cathode ray tube display device receives the R, G, and B signals sent in parallel via this cable. The display is performed in response to the display signal and horizontal and vertical synchronization signals.

However, the polarity of the horizontal and vertical synchronizing signals output from this information processing device differs depending on the manufacturer, and there is a problem in that display cannot be performed if the polarity is incorrectly connected.

One possible solution to this problem is to install a polarity switch to match the polarity of the cathode ray tube display device to the polarity of the horizontal and vertical synchronizing signals being sent, but such an operation point The increase in number of devices has the problem of causing various troubles due to the complexity of operations.

DISCLOSURE OF THE INVENTION Accordingly, an object of the present invention is to provide a cathode ray tube display device in which the polarities of horizontal and vertical synchronizing signals are determined and automatically matched.

In order to achieve this purpose, the present invention provides a horizontal signal that is supplied through the signal cable to the connector section that connects the signal cable to the cathode ray tube display device.
A polarity discrimination pin that electrically indicates the polarity of the vertical synchronization signal is provided, and polarity matching is performed by controlling a polarity inverting circuit for the horizontal and vertical synchronization signals depending on the state of the polarity discrimination pin when the connector is connected.

In devices configured in this way, the connector on the information processing device side of the signal cable is unique to each device, so this cable can be connected to a specific information processing device and a specific cathode ray tube display. Since this is a special cable that connects to the device, connect the connection pin that matches the polarity determination pin provided on the connector of this cable to indicate the polarity of the horizontal/vertical synchronization signal sent through this cable. By doing this, polarity matching is automatically performed just by connecting the connector, thereby preventing operational errors and complicated operations.

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 is a circuit diagram showing an embodiment of a cathode ray tube display device according to the present invention, and particularly shows a connector portion for connecting a signal cable to the cathode ray tube display device. be. In the figure, reference numeral 1 denotes a cathode ray tube display device, and a part thereof is provided with a connector piece 2 having, for example, an 8-pin configuration. Then, the horizontal synchronization signal HD and vertical synchronization signal of this connector piece 2
Pins 3a and 3b to which VD is supplied are supplied via a polarity inversion circuit 4 to horizontal and vertical deflection circuits (not shown). This polarity reversing circuit 4 is controlled by a polarity signal A generated from a polarity determination pin 3c pulled up by a resistor 5, and is controlled by a horizontal synchronization signal HD and a polarity signal A supplied from a pin 3a. The exclusive OR gate 6 receives the vertical synchronizing signal VD and the polarity signal A supplied from the pin 3b as inputs. Further, a pin 3d provided on the plug 2 is connected to ground. In addition,
R, G, B signal lines and their associated connection pins are omitted.

On the other hand, the connector piece 8 provided at the end of the signal cable and fitted into the connector piece 2 is provided with pins 9a to 9d connected to the connector pieces 3a to 3d, and the pins 9a and 9b are connected to the connector piece 2. A horizontal synchronization signal HD and a vertical synchronization signal VD are supplied from an information processing device (not shown) via the . Also,
Pins 9c and 9d connected to pins 3c and 3d are
By connecting the jumper line 10, the horizontal and vertical synchronizing signals HD/
Indicates that VD is the supplied cable.

In the cathode ray tube display device configured as described above, when the dedicated connector piece 8 to which the signal cable is connected is fitted into the connector piece 2, the pins 3a to 3
d are connected to pins 9a to 9d, respectively, and a horizontal synchronizing signal HD and a vertical synchronizing signal VD are supplied to exclusive OR gates 6 and 7 of polarity inverting circuit 4, respectively. On the other hand, pins 3c and 3d are pin 9
pin 3c as a polarity determination pin by the jumper line 10.
is dropped to earth. As a result, the polarity signal A supplied from the pin 3c to the polarity inversion circuit 4 becomes "L" and polarity inversion control is no longer performed, and the horizontal synchronization signal HD and the vertical synchronization signal VD maintain the same polarity and are connected to the horizontal deflection circuit and Supplied to the vertical deflection circuit.

Next, when the jumper line 10 of the connector piece 8 is not provided, the pin 3c pulled up by the resistor 5 remains "H", and the polarity signal A goes "H" accordingly. In order to become
The exclusive OR gates 6 and 7 invert the polarities of the horizontal synchronizing signal HD and vertical synchronizing signal VD, thereby sending out horizontal synchronizing signals HD and vertical synchronizing signals VD whose polarities are matched. Therefore, in a device configured in this manner, the polarities of the horizontal and vertical synchronizing signals HD and VD are automatically matched to the polarity of the device simply by connecting the dedicated cable to the connector. Therefore, there is no need for a configuration in which operations such as operating a polarity changeover switch are complicated and prone to operational errors, and its handling becomes easy.

FIG. 2 shows another embodiment of the cathode ray tube display device according to the present invention, in which the same parts as in FIG. 1 are indicated using the same symbols. The difference between Fig. 2 and Fig. 1 is that by connecting pin 9c of connector piece 8 to ground via jumper line 10, empty pins 3d and 9d are used to supply buzzer signal BS. The buzzer signal BS transmitted to pin 3d is supplied to a buzzer drive circuit (not shown). In other words, FIG. 2 shows a case where the connector piece 8 has a ground line, and in this case, pin 3
It is no longer necessary to connect the pin 9c to the ground line of the cathode ray tube display device 1 by using the connections made by d and 9d. As a result, the pins 3d and 9d become vacant, and in a connector with a limited number of pins, these vacant pins 3d and 9d can be effectively used to obtain other functions. In the embodiment shown in FIG.
It was used to supply BS to a buzzer installed on the cathode ray tube display side.

In this way, when a buzzer is also provided on the cathode ray tube display side, when operating with a light pen, the buzzer is emitted from a part close to the operation part of the light pen, so it is not possible to use the light pen as in the conventional case. This eliminates the sense of discomfort caused by the buzzer of the operating unit that is far away from the designated tube surface.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing one embodiment of the cathode ray tube display device according to the present invention, and FIG. 2 is a circuit diagram showing another embodiment of the cathode ray tube display device according to the present invention. 1... Cathode ray tube display device, 2, 8... Connector piece, 3a to 3d, 9a to 9d... Pin, 4... Polarity inversion circuit, 5... Resistor, 6, 7... Exclusive OR gate, 10 ... Jumper line.

Claims (1)

[Scope of utility model registration request] In a cathode ray tube display device that displays on the surface of a cathode ray tube by inputting horizontal and vertical synchronizing signals and display information signals supplied from an information processing device such as a microcomputer via a signal cable,
The signal cable and the cathode ray tube display device are connected by a connector, and a polarity detection pin is provided in this connector portion to be set to “L” or “H” when the connector is attached, depending on the polarity of the horizontal/vertical synchronizing signal. , a polarity inversion circuit that inverts the polarity of the horizontal/vertical synchronization signal is controlled in accordance with the "L" or "H" of the polarity detection pin to automatically perform polarity matching at the same time as the connector is attached. Cathode ray tube display device.