JPH0572986A - Automatic adjusting circuit of multi-mode type crt display monitor - Google Patents

Abstract

PURPOSE:To simplify a process adjustment (horizontal amplitude, horizontal screen position, vertical amplitude, vertical screen position, etc.) of the multi- mode type CRT display monitor which varies the deflection frequency following up a horizontal and a vertical synchronism polarity. CONSTITUTION:The process adjustment of the CRT display monitor consists of the multi-mode type CRT display monitor consisting of (1) a nonvolatile memory 33 stored with adjustment data of plural modes, (2) a read setting circuit 35 which selects one of the adjustment data of the modes and sets its value in a DAC, (3) a synchronism polarity detecting circuit 1 which decides the polarities of a horizontal and a vertical synchronizing signal, (4) a DAC circuit 34 which converts the adjustment data into a direct current, and (5) an analog output circuit 4 which controls the horizontal amplitude and horizontal screen position, and vertical amplitude and vertical screen position of the CRT display monitor by using the adjustment data converted into the direct current, an image position and amplitude detector 8 which detects a CRT image, and an automatic adjuster 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to process adjustment (horizontal amplitude, horizontal screen position, vertical amplitude, vertical) of a multi-mode type CRT display monitor in which the deflection frequency is changed in accordance with horizontal and vertical sync polarities. Screen position) circuit.

[0002]

2. Description of the Related Art In recent years, personal computers have made remarkable progress, and the number of dots displayed on a CRT display monitor, which is a man-machine interface, has also been increased in resolution.

On the other hand, in order to effectively use conventional software assets, there are many types of conventional display modes corresponding to the number of display dots. There is a demand for a multi-mode type CRT display monitor that displays such several types of display dots on a single CRT display monitor.

An example of a conventional process adjuster (horizontal amplitude, horizontal screen position, vertical amplitude, vertical screen position, etc.) of a multimode CRT display monitor will be described with reference to FIG.

In FIG. 2, reference numeral 1 is a horizontal sync polarity detector,
2 is a vertical sync polarity detector, 3 is an adjuster, 31 is a volume, 32 is a switch, 4 is an analog output circuit of a CRT display monitor, 5 is a deflection coil, 6 is a CRT (cathode ray tube), 7 is a video amplifier, Reference numeral 8 is an image position / amplitude detector, 9 is a process automatic adjuster, and 10 is a robot.

The mutual relationship and operation of the components of the circuit of FIG. 2 will be described below. The horizontal sync signal input to the CRT display monitor is input to the horizontal sync polarity detector 1 and the analog output circuit 4 of the CRT display monitor, and the horizontal sync polarity detector 1 digitally determines the polarity of the input horizontal sync signal. Output the value.

Similarly, the vertical sync signal input to the CRT display monitor is the vertical sync polarity detector 2 and CR.
The vertical sync polarity detector 2 is input to the analog output circuit 4 of the T display monitor and outputs a digital value for determining the polarity of the input vertical sync signal.

A switch 32 selects one set of a volume 31 in the adjustment data generator 3 according to the respective outputs of the horizontal sync polarity detector 1 and the vertical sync polarity detector 2.
The horizontal amplitude, horizontal screen position, vertical amplitude and vertical screen position of the analog output circuit 4 of the CRT display monitor are controlled so that the monitor screen is displayed at a predetermined position and amplitude.

The video signal is amplified by the video amplifier 7 and applied to the cathode of the CRT 6.

The analog output circuit 4 supplies a deflection current having a saw-tooth waveform to the deflection coil 5 in synchronization with the horizontal and vertical synchronizing signals to display a video signal on the CRT screen.

The image position / amplitude detector 8 optically detects the position and amplitude of the image displayed on the CRT 6 and inputs it to the automatic process adjuster 9. The automatic process adjuster 9 controls the robot 10 so that an image is displayed at a predetermined position and amplitude,
The volume 31 is rotated to adjust the position and amplitude of the image.

Adjustment is automatically performed by repeating the above adjustment loop several times.

[0013]

In the above-mentioned conventional example, since there are four combinations of polarities of the horizontal and vertical synchronizing signals of FIG. 2, four sets of adjusting volumes are provided. Then the horizontal amplitude,
Factory adjustment of as many as 16 volumes is required to adjust the horizontal screen position, vertical amplitude, and vertical screen position.

FIG. 3 shows an example in which 16 adjusting volumes 31 are attached to the printed wiring board 11. As can be seen from the figure, the adjustment volume 31 is arranged at the end of the printed wiring board 11, so that the pattern of the printed wiring board 11 is occupied by the connection to the adjustment volume 31, and the adjustment volume 31 is installed in the factory. The adjustment volume 31 is adjusted by the robot 10 which is an automatic adjustment facility for the adjustment process.
However, there is a problem in that it is difficult to align the position with the adjusting volume 31, and maintenance is required due to mechanical adjustment and wear of mechanical parts.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to adjust the horizontal amplitude, horizontal screen position, vertical amplitude, and vertical screen position electrically by a single set of adjustment outputs. An object is to provide an automatic adjustment circuit for a CRT display monitor of the type.

[0016]

In order to achieve the above object, an automatic adjustment circuit of a multi-mode type CRT display monitor according to the present invention comprises: (1) a non-volatile memory for storing adjustment data of a plurality of modes; ) Select one set of adjustment data from the adjustment data of the above multiple modes, and set the value to D
A read setting circuit for setting to AC, (3) a sync polarity detection circuit for determining the polarities of horizontal and vertical sync signals, and (4)
A DAC circuit for converting the adjustment data into DC, (5) an analog circuit for controlling the CRT display monitor horizontal amplitude, horizontal screen position, vertical amplitude, and vertical screen position by the adjustment data converted into DC, (6) CRT A means for detecting the amplitude and position of the image on the screen and (7) comparing the detected value and the adjusted value of the position and amplitude, and correcting the difference between the adjusted value and the detected value of the position and the amplitude of the CRT display monitor. It consists of an automatic process adjuster that controls horizontal amplitude, horizontal screen position, vertical amplitude, and vertical screen position.

[0017]

According to the present invention, (1) four sets of horizontal amplitude, horizontal screen position, vertical amplitude and vertical screen position adjustment data are registered in the non-volatile memory, and (2) horizontal and vertical sync signal synchronization is performed by the read setting circuit. At the output of the polarity detection circuit, one set is selected and read out from the above-mentioned four sets of adjustment data registered, and the value is set as the digital set value of the DAC.

(3) The adjustment data set in the DAC is converted into a DC signal by the DAC, and (4) the DC signal converts the horizontal amplitude, horizontal screen position, vertical amplitude and vertical screen of the analog output circuit of the CRT display monitor. Control the position.

(5) The image position and amplitude detector detects the position and amplitude of the image displayed on the CRT.

(6) The automatic adjuster rewrites the contents of the non-volatile memory so that the image displayed on the CRT has a predetermined position and amplitude. This has the effect of automatically adjusting the monitor screen so that it is displayed at a predetermined position and amplitude.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, elements having the same contents as in FIG. 2 are given the same numbers. In FIG. 1, 1 is a horizontal sync polarity detector, 2 is a vertical sync polarity detector, 3 is an adjuster, 33 is a non-volatile memory, 34 is a DAC, 35 is a read setting circuit, 36 is a communication control circuit, and 4 is a CRT. Display monitor analog output circuit, 5 deflection coil, 6
Is a CRT, 7 is a video amplifier, 8 is an image position / amplitude detector, and 9 is an automatic process adjuster.

The mutual relationship and operation of the components of the circuit of FIG. 1 will be described below. The horizontal sync signal input to the CRT display monitor is input to the horizontal sync polarity detector 1 and the analog output circuit 4 of the CRT display monitor.

The horizontal sync polarity detector 1 determines the polarity of the input horizontal sync signal. In the polarity determination, the high level period and the low level period are compared, and the shorter period is determined to be the synchronization signal. Therefore, if the high level is short, it is determined as a positive sync signal, and if the high level is long, it is determined as a negative sync signal.

The vertical sync signal input to the CRT display monitor is input to the vertical sync polarity detector 2 and the analog output circuit 4 of the CRT display monitor.

The vertical sync polarity detector 2 determines the polarity of the input vertical sync signal. Horizontal sync polarity detector 1,
Each output of the vertical sync polarity detector 2 is connected to the read setting circuit 35.

The communication control circuit 36 communicates with an external device (not shown) via a communication line to write four sets of adjustment data in the nonvolatile memory 33.

The read setting circuit 35 receives four sets of adjustment data (horizontal amplitude, horizontal screen position, vertical amplitude, vertical screen position, etc.) of the nonvolatile memory 33 from the polarity input of the synchronizing signal.
One set is selected and set in the read DAC 34.

The adjustment data is converted into a DC voltage by the DAC 34 and input to the analog output circuit 4, and the horizontal amplitude, horizontal screen position, vertical amplitude and vertical screen position are controlled to display the monitor screen at a predetermined position. , Amplitude is displayed.

The video signal is amplified by the video amplifier 7 and applied to the cathode of the CRT 6. The analog output circuit 4 supplies a deflection current having a sawtooth waveform to the deflection coil 5 in synchronization with the horizontal and vertical synchronization signals, and displays an image on the CRT screen. The image position / amplitude detector 8 detects the position and amplitude of the image displayed on the CRT 6 and inputs it to the process automatic adjuster 9. The automatic process adjuster 9 changes the content of the adjustment data in the nonvolatile memory 33 through the communication control circuit 36 so that the image is displayed at a predetermined position and amplitude.

The changed adjustment data is read by the read setting circuit 35 and set in the DAC 34.
Controls the position and amplitude of the image. The adjustment is automatically performed by repeating the above adjustment loop several times.

[0032]

According to the present invention, four sets of adjustment data are stored in the non-volatile memory in the factory adjustment process, and one of the registered four sets of adjustment data is selected according to the polarities of the horizontal and vertical synchronizing signals. By doing so, it is possible to configure with four DC voltage output circuits instead of the 16 adjustment volumes conventionally provided in the analog control part in the regulator, the circuit can be simplified and the device can be downsized, and Since it is not necessary to rotate and adjust the mechanically movable part by the robot, it is possible to provide a highly reliable automatic adjustment circuit for a multi-mode type CRT display monitor.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an automatic adjustment circuit of a CRT display monitor showing an embodiment of the present invention.

FIG. 2 is a circuit diagram of an automatic adjustment circuit of a conventional CRT display monitor.

FIG. 3 is a perspective view showing a volume mounting example.

[Explanation of symbols]

 1 horizontal sync polarity detector 2 vertical sync polarity detector 3 adjuster 4 analog output circuit 5 deflection coil 6 CRT 7 video amplifier 8 image position and amplitude detector 9 process automatic adjuster 10 robot 31 volume 32 switcher 33 non-volatile memory 34 DAC 35 Read setting circuit 36 Communication control circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04N 3/27 7037-5C 5/04 Z 9070-5C

Claims (1)

[Claims] 1. A non-volatile memory for storing adjustment data of a plurality of modes, and a set of adjustment data is selected from the adjustment data of the plurality of modes, and a value thereof is digitalized by a digital-analog converter (hereinafter referred to as DAC). Readout setting circuit that sets as setting value, sync polarity detection circuit that determines the polarity of horizontal and vertical sync signals, DAC circuit that converts adjustment data to DC, and CRT display monitor horizontal amplitude by adjustment data that is converted to DC , An analog circuit for controlling the horizontal screen position, vertical amplitude, and vertical screen position, a means for detecting the amplitude and position of the image on the CRT screen, compares the detected value of the position and amplitude with the adjustment value, and Controlling the horizontal amplitude, horizontal screen position, vertical amplitude, and vertical screen position of the CRT display monitor in the direction to correct the difference from the detected value C multimode type consisting of dynamic regulator
Automatic adjustment circuit for RT display monitor.