JP2597161Y2 - Multi scan monitor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-scan monitor, and more particularly, to a multi-scan monitor capable of determining and displaying whether an input signal can be displayed.

[0002]

2. Description of the Related Art There is a so-called multi-scan monitor capable of inputting signals of various synchronous frequencies and displaying a screen corresponding to the signals.

[0003] Even with such a multi-scan monitor, the range of frequencies or frequencies that can be handled is fixed, and when a signal of any other frequency is input, a normal screen display cannot be performed.

Further, the conventional multi-scan monitor has no means for determining whether or not an input signal is actually compatible (displayable), and the determination is made by looking at the display screen. It is the current situation. That is, if the display screen is normal, it can be dealt with, and if there is an abnormality in the display screen, it can be determined that it cannot be dealt with.

[0005]

However, when there is an abnormality in the display screen, the failure of the monitor can be considered as a cause. Therefore, looking at the display screen, whether the cause of the display abnormality is in the signal or in the monitor. It has been difficult to determine whether a failure has occurred.

It is to be noted that a so-called single scan type monitor, which inputs a signal of a single synchronous frequency and performs a screen display in response to the signal, judges the presence or absence of a signal input, and displays the judgment result. (See Japanese Patent Publication No. 63-232727), however, it is not intended to determine whether an input signal can be displayed normally.

The multi-scan monitor of the present invention has been made in view of such circumstances, and has as its object to provide a multi-scan monitor capable of displaying whether or not an input signal can be handled by the monitor.

[0008]

SUMMARY OF THE INVENTION A multi-scan monitor of the present invention receives signals of various synchronization frequencies, and displays a screen corresponding to the input signals. Signal processing means for extracting a horizontal synchronizing signal or a vertical synchronizing signal, and judging means for extracting a frequency of the horizontal synchronizing signal or the vertical synchronizing signal and determining whether the synchronizing signal can be supported by the monitor based on the frequency. Display control means for displaying the result of the determination by the determination means, and display means for displaying the result of the determination under the control of the display control means.

[0009]

The horizontal and / or vertical synchronizing frequencies are extracted, it is determined whether or not the synchronizing frequencies are compatible, and the result of the determination is displayed.

[0010]

FIG. 1 is a diagram showing the configuration of a multi-scan monitor according to the present invention. FIG. 1 shows a signal processing circuit which converts a vertical synchronizing signal (V) from a video signal (V) input from a personal computer or the like. VP) and the horizontal synchronization signal (HP),
These signals are output to a microprocessor (CPU) (2). The CPU (2) receives the signal from the signal processing circuit (1), measures the presence / absence of the signal and the frequency of the synchronization signal, and determines whether or not the input video signal is compatible.

In the case of a multi-scan monitor capable of displaying only a specific frequency range (for example, a horizontal synchronization frequency corresponds to a range of 15.5 kHz to 35 kHz, and a vertical synchronization frequency corresponds to a range of 50 Hz to 80 Hz). If the synchronizing frequency is within the range of the frequency, it is determined that it is possible to cope.

Further, in the case of a multi-scan monitor capable of displaying only a plurality of fixed synchronization frequencies (for example, horizontal synchronization frequencies of 24.83 kHz and 32.84 kHz)
) Is displayed when a signal other than the frequency is input.

If there is no input signal, or if the signal has a frequency that cannot be handled, a message to that effect is displayed. In the present embodiment, this display is performed by controlling the blinking of the POWER LED (3) for displaying the power ON / OFF.

As described above, if an existing display unit such as a POWER LED is used as a display unit when there is no input signal, it is not necessary to newly provide a special display unit, and the display can be easily implemented. It is. Needless to say, the information may be displayed on the display screen of the monitor.

(4) is a transistor for controlling the lighting of the LED (3). When there is no input signal or when the signal has a frequency that cannot be handled, the CPU (2) issues a signal.
The lighting control signal (S) is output to the base of the transistor (4). This lighting control signal (S) has a different blinking period between the case where there is no input signal and the case where the input signal cannot be responded.
If it is impossible to respond, the blinking period is extended, so that the user can easily distinguish between the two.

In this embodiment, an example has been described in which the determination as to whether or not the input signal can be performed is made based on the horizontal or vertical synchronization frequency. Position of front porch and back porch (for centering the screen), polarity of synchronization signal, V
By adding compatibility with the GA standard or the like to the determination conditions, more accurate determination can be performed. These determinations can be made by the CPU (2).

As described above, according to the multi-scan monitor of this embodiment, when connected to a personal computer or the like and used, it is determined whether or not the video signal output of the personal computer can support the monitor by using the LED. It becomes possible just by looking at (3). In addition, the display mode of the LED (3) changes between when there is no input signal and when there is no input signal, so that there is an error in connection with the personal computer or the like, and the video from the personal computer or the like is incorrect. It is possible to know the state where no signal is output. Further, when the LED (3) is not blinking and there is an abnormality in the display on the screen, it is easily understood that there is a cause of failure on the monitor side.

[0018]

As described above, according to the multi-scan monitor of the present invention, it is possible to provide a multi-scan monitor capable of displaying whether or not an input signal is compatible with the monitor.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a multi-scan monitor of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Signal processing circuit 2 CPU 3 POWER LED 4 Transistor

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiichi Kobayashi 2-18-18 Keihan Main Road, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) H04N 5 / 44

Claims (1)

(57) [Scope of request for utility model registration] 1. A multi-scan monitor for inputting signals of various synchronization frequencies and displaying a screen corresponding to the input signals, wherein a signal processing for extracting a horizontal synchronization signal or a vertical synchronization signal from the input signals. Means, extracting means for extracting the frequency of the horizontal synchronizing signal or the vertical synchronizing signal, and judging from the frequency whether the synchronizing signal is compatible with the monitor, and display for displaying the judgment result of the judging means A multi-scan monitor comprising: a control unit; and a display unit that is controlled by the display control unit and displays a determination result.