JPH07334112A - Adjusting system for video monitor - Google Patents

Abstract

PURPOSE:To display message information in an overlay region and to correctly and efficiently perform adjusting work by providing an on-screen display circuit executing overlay display of the message information on a display part and an input operation unit connected to a microprocessor. CONSTITUTION:The respective switches of an input operation unit 14 are connected to a microprocessor 11 altogether. On the other hand, a DA converter 12 as well as an on-screen display circuit 13 are connected to the output bus of the microprocessor 11 and the output of the DA converter 12 is connected to the prescribed portion of a video monitor M including a video amplifier circuit M2, a vertical deflection circuit M and a horizontal deflection circuit M4. By this constitution, since the microprocessor 11 performs the overlay display of arbitrary message information on the display part of the video monitor M through the on-screen display circuit 13, proper instruction is given to an adjusting operator by selecting the contents of the message information according to an adjusting contents.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adjusting system for a video monitor, which allows appropriate and efficient adjustment work by displaying appropriate message information on a display section.

[0002]

2. Description of the Related Art It is known to incorporate an adjusting system using a microprocessor into a video monitor having a color cathode ray tube (Japanese Patent Laid-Open No. 3-35287).

In order to optimally adjust the image quality of a video monitor, it is necessary to set optimum operating parameters for a video amplifier circuit, a vertical deflection circuit, a horizontal deflection circuit and the like. Therefore, the microprocessor can complete the adjustment work of the video monitor by sending these operation parameters to a predetermined adjustment target via a DA converter (hereinafter referred to as a digital-analog converter). It should be noted that while the microprocessor has a non-volatile memory to hold these operating parameters,
Provided with an input operation unit including selection, increasing direction, decreasing direction operation switches and a group of lamp indicators for selecting adjustment items and adjusting and setting operation parameters via a microprocessor. And

[0004]

According to the prior art, the adjusting system does not have any message display function other than the lamp display unit included in the attached input operation unit. All adjustment procedures must be fully mastered in advance, and the problem that adjustment work tends to be time-consuming is inevitable.

Therefore, an object of the present invention is to provide a microcomputer, an on-screen display circuit, and an input operation unit so that any message information necessary for adjustment work can be overlay-displayed using the display section of a video monitor. An object of the present invention is to provide a video monitor adjustment system capable of performing adjustment work accurately and efficiently.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the structure of the present invention has a microprocessor for transmitting an adjustment signal to a predetermined portion of a video monitor through a DA converter, and a display request from the microprocessor. The gist of the present invention is to provide an on-screen display circuit for overlaying message information on a display section of a video monitor and an input operation unit connected to a microprocessor.

The input operation unit may be a combination of an operation switch and a rotary encoder.

On the other hand, the microprocessor displays an instruction icon on the display unit according to the increasing or decreasing direction of the operation parameter input via the rotary encoder, or has a help message display function, and the rotary encoder is The help message can be scrolled and displayed, and the function for changing the display size of the message information may be provided.

Instead of the rotary encoder, it is possible to provide an operation switch capable of designating an increasing direction and a decreasing direction of operation parameters.

Further, the microprocessor measures the vertical frequency and horizontal frequency of the input signal, and when the input signal deviates from the display specifications of the video monitor, an error message can be displayed on the display unit. When there is no, an error message may be displayed on the display unit.

When outputting the error message, the microprocessor disconnects the horizontal deflection circuit from the synchronous processing circuit, specifies the horizontal oscillation frequency via the DA converter, and causes the vertical oscillation frequency to follow the horizontal oscillation frequency. The clamp circuit can be switched to the horizontal deflection circuit side, and the video amplifier circuit can be disconnected from the input terminal when outputting the error message.

Further, the input operation unit may include an operation switch for directly selecting a specific adjustment item.

[0013]

According to the structure of the invention, the microprocessor sends an adjustment signal to a predetermined part of the video amplifier circuit, the vertical deflection circuit, the horizontal deflection circuit, etc. of the video monitor through the DA converter, and the operation parameters of these signals are sent. By changing, it is possible to adjust to the optimum image quality. In addition,
Adjustment items at this time include, for example, brightness, contrast, horizontal size, horizontal position, vertical size, vertical position, pincushion distortion, trapezoidal distortion, horizontal convergence,
It includes vertical convergence, inclination, horizontal moire correction, color temperature level, reference levels of red, green and blue, gain levels of red, green and blue, sub-contrast and the like.

On the other hand, the microprocessor can overlay-display any message information on the display section of the video monitor through the on-screen display circuit.
By selecting the content of the message information according to the adjustment content, it is possible to give an appropriate instruction to the coordinator. However, the display unit at this time is supposed to display an image for adjustment such as cross-hatching by giving an input signal to the input terminal of the video monitor. Therefore, the message information is used for these adjustments. Overlay display shall be performed so as to be superimposed on the image. In addition, the content of the message information may include an arbitrary symbol as well as an arbitrary character string, and even if the message information is displayed with a frame for display for each character. Alternatively, only the character may be displayed without providing a special frame.

When the input operation unit is a combination of an operation switch and a rotary encoder, the rotary encoder is used for an operation of selecting an adjustment item and an operation of changing an operation parameter to increase or decrease. Can be used for the setting instruction operation of the adjustment item thus selected and the adjusted operation parameter.
However, the rotary encoder at this time can be endlessly rotated left and right, and an electric pulse signal accompanied by rotation direction information is input to the microprocessor for each constant left and right rotation amount. Following the rotary operation of the rotary encoder,
The operating parameters of the video monitor can be changed in real time. On the other hand, if the operation switch is operated when the optimum image quality is obtained, the microprocessor can store the operation parameter at that time in the non-volatile memory and hold it.

The rotary encoder can be replaced with an operation switch capable of designating an increasing direction and a decreasing direction of the operation parameter. At this time, as the operation switch, a set of two push button switches or one set of push button switches is used. It is possible to use a two-way switch.

When the microprocessor can display an error message, the video monitor can display the deviation or absence of the specification of the input signal on the display.
It is possible to clearly distinguish and display the failure of itself and the failure of the input signal generation source.

Note that the microprocessor can operate the horizontal deflection circuit and the vertical deflection circuit at a predetermined horizontal oscillation frequency and vertical oscillation frequency by performing a switching operation such as disconnecting the horizontal deflection circuit from the synchronization processing circuit. Therefore, at this time, the error message displayed on the display unit via the on-screen display circuit can be stably displayed at a predetermined portion of the display unit with a predetermined size.

Further, at this time, if the video amplifier circuit is disconnected from the input terminal, when no input signal is present, noise mixed in the input terminal causes an unnecessary image to be displayed in an area other than the error message display area, resulting in a screen error. It is possible to surely prevent that is difficult to see.

When the input operation unit has an operation switch for directly selecting an adjustment item, by operating the operation switch, the microprocessor can directly perform a specific adjustment without going through the main menu or the adjustment menu. It is possible to select an item and immediately move to the adjustment work.

[0021]

Embodiments Embodiments will be described below with reference to the drawings.

The video monitor adjustment system comprises a microprocessor 11, a DA converter 12, an on-screen display circuit 13, and an input operation unit 14 (FIG. 1).

The video monitor M is a color cathode ray tube M1a.
And a video amplifier circuit M2, a vertical deflection circuit M3, and a horizontal deflection circuit M4. The video amplifier circuit M2 incorporates a mixer M2a for mixing the video signal Sv from the outside and the video signal Sa from the on-screen display circuit 13.

The input operation unit 14 includes an operation switch S.
Wa, a rotary encoder 14a, and other operation switches SWb, SWb ... And these members are all connected to the microprocessor 11. On the other hand, D
The A converter 12 and the on-screen display circuit 13 are both connected to the output bus of the microprocessor 11, and the output of the DA converter 12 includes a video amplifier circuit M2, a vertical deflection circuit M3, and a horizontal deflection circuit M4. It is connected to a predetermined part of the video monitor M. Here, the DA converter 12 is a multi-channel type which is selectively operated by being addressed by the microprocessor 11, and the output from the DA converter 12 is a video monitor M.
Is assigned to a specific channel for each operation parameter for each of the predetermined parts, and is sent as an individual adjustment signal Sx to each of the predetermined parts.

Microprocessor 11, DA converter 1
2. The on-screen display circuit 13 is integrated into the video monitor M regardless of FIG. 1 (FIG. 2). The input operation unit 14 is mounted on the surface of a cabinet (not shown) at a location such as the lower portion of the display section M1 which is easy to operate.

The video monitor M has two input terminals T each.
i, Thi, Tvi (i = 1, 2). Input terminal Ti
Is input with an input signal consisting of a video signal, and input terminals Thi and Tvi are respectively input with a horizontal synchronizing signal and a vertical synchronizing signal. Input terminal Ti
, Thi and Tvi are changeover switches SW1 and S1, respectively.
It is connected to the synchronous processing circuit M5 via W2 and SW3, and the changeover switches SW1, SW2 and SW3 select one of the input terminals Ti, Thi and Tvi by the common changeover signal Sb from the microprocessor 11. You can
The input terminal Ti is connected to the mixer M2a of the video amplifier circuit M2 via another changeover switch SW7 in addition to the changeover switch SW1.

The output of the synchronization processing circuit M5 is used as a horizontal synchronization signal Sch and a vertical synchronization signal Scv as the microprocessor 1
It is input to 1. The horizontal synchronizing signal Sch is branched and input to the horizontal oscillator M4a of the horizontal deflection circuit M4 via the changeover switch SW4. Also, the vertical synchronization signal Scv
Is branched and input to the vertical oscillator M3a of the vertical deflection circuit M3 via another changeover switch SW5 and the waveform shaping circuit 17.

The horizontal deflection circuit M4 comprises a horizontal oscillator M4a and a horizontal output circuit M4b, which are connected in series. The output of the horizontal output circuit M4b is connected to a horizontal deflection coil M1c. On the other hand, the vertical deflection circuit M3 includes a vertical oscillator M3a and a vertical output circuit M3b.
The output of the vertical output circuit M3b is connected to the vertical deflection coil M1b. In addition, the horizontal output circuit M4b
The other output is fed back to the horizontal oscillator M4a, and is also connected to one contact of the changeover switch SW5 via the waveform shaping circuit 15 and the frequency divider 16.

The outputs of the waveform shaping circuits 15 and 17 are also branched and connected to the on-screen display circuit 13, and the output of the waveform shaping circuit 15 together with the other output of the synchronization processing circuit M5 are changed over by a changeover switch SW6, Clamp circuit M
It is led to the video amplifier circuit M2 via 6. The on-screen display circuit 13 is additionally provided with a phase-locked loop type oscillator 13a controlled by the output from the microprocessor 11. The output of the oscillator 13a is input to the on-screen display circuit 13 as a clock signal Se. There is. Further, one output of the DA converter 12 is led to the horizontal oscillator M4a as a control signal Sf.

The changeover switches SW4, SW5 ... SW
7 is a common switching signal S from the microprocessor 11.
It can be opened and closed collectively by d and switched.

Now, when a video signal, a horizontal synchronizing signal, and a vertical synchronizing signal are input to one of the input terminals Ti, Thi, Tvi, the video signal passes through the change-over switches SW1 and SW7 and is output as the video signal Sv to the video amplifier circuit M2. On the other hand, the horizontal synchronizing signal and the vertical synchronizing signal are input to the mixer M2a of the horizontal deflection circuit M4 and the vertical deflection signal through the changeover switches SW2, SW3 and the synchronization processing circuit M5 and one of the changeover switches SW4 and SW5, respectively. Since it is input to the circuit M3, the video monitor M can display a predetermined image on the display unit M1 according to a video signal from the outside.
However, at this time, the microprocessor 11 switches the changeover switches SW1, SW2, SW3 to the side where the input signal exists by the changeover signal Sb, closes the changeover switches SW4, SW7 by the changeover signal Sd, and closes the changeover switches SW5, SW6. It shall be switched to the synchronous processing circuit M5 side.

When the video signal input to the input terminal Ti is a composite video signal including a sync signal, the sync processing circuit M5 operates as a sync separation circuit. Also,
It is assumed that the video signal input to the input terminal Ti displays a cross-hatched image by, for example, a white line when the adjustment system including the microprocessor 11 is operated to adjust the video monitor M.

On the other hand, the microprocessor 11 operates at the same time when the power of the video monitor M is turned on, and starts the main processing routine of FIG. That is, the program starts the signal switching processing routine via the program step (2) after the initial setting operation (program step (1) in FIG. 3, hereinafter simply referred to as (1)) (8 ). Further, the microprocessor 11 operates the vertical synchronization signal interrupt routine of FIG. 4A each time the vertical synchronization signal Scv is generated at the same time when the power is turned on.
That is, the microprocessor 11 uses the vertical synchronization signal S
Every time cv is generated, the vertical synchronizing signal Scv and the horizontal synchronizing signal Sch
Is measured (program step (1) in FIG. 4 (A),
(3)) The vertical frequency and horizontal frequency of the video signal input from the outside are measured.

Immediately after the power is turned on, the signal switching processing routine of FIG.
So that the entire screen of the color cathode ray tube M1a becomes a black screen,
Blank data is output to the on-screen display circuit 13 (program step (1) in the figure, hereinafter simply referred to as (1)). Therefore, the on-screen display circuit 13 uses the video signal S such that the entire screen becomes a black screen.
Since a is generated and output to the mixer M2a of the video amplifier M2, the entire screen becomes a black screen regardless of the video signal input from the outside.

Thereafter, the signal switching processing routine confirms that the measured vertical frequency and horizontal frequency are within the display specifications of the video monitor M ((2), (3),
(4)), cancel the blank output and restore the screen to the normal operation state (5), and if the vertical frequency and the horizontal frequency correspond to the signals already registered in the memory (not shown) (6), register them. The adjustment value data corresponding to the completed signal is read from the non-volatile memory and output to the DA converter 12 (7). Therefore, the DA converter can send the adjustment signal Sx corresponding to the adjustment value data from the non-volatile memory to a predetermined portion of the video monitor M including the video amplification circuit M2, the vertical deflection circuit M3, and the horizontal deflection circuit M4. Therefore, the image corresponding to the video signal from the outside can be displayed on the display unit M1 with the optimum image quality.

When the vertical frequency and the horizontal frequency do not correspond to the registered signals (6), the program outputs predetermined adjustment value data to the DA converter 12 (11).

On the other hand, when it is determined that the measured vertical frequency and horizontal frequency deviate from the display specifications of the video monitor M (4), the program outputs blank output immediately after the power is turned on (8). After canceling (9), the on-screen display circuit 13 is requested to display an error message (10). Therefore, the display unit M1 at this time can display an error message as shown in FIGS. 14 (A) and 14 (B). However, the display request in the program step (10) is checked in the program step (7) of the main processing routine of FIG.
In the program steps (2) and (6) of the OSD display processing routine of FIG. 11, the error message when the display specifications are deviated (FIG. 14A) and the error message when there is no signal (FIG. 14B) are displayed. Shall be sorted (Fig. 1
1 program steps (10), (11)).

When the microprocessor 11 detects the deviation of the display specification of the input signal or the absence of the input signal in this way, it sends the control signal Sf to the horizontal oscillator M4a via the DA converter 12. Feeding (FIG. 2), the horizontal deflection circuit M4 is self-propelled so as to have a specific horizontal oscillation frequency. At the same time, the microprocessor 11 causes the switching signal S
By generating d, the changeover switch SW4 is opened to disconnect the horizontal deflection circuit M4 from the synchronous processing circuit M5, and the changeover switch SW5 is changed over to the frequency divider 16 side so that the vertical oscillation frequency of the vertical oscillator M3a follows the horizontal oscillation frequency. Let
The changeover switch SW6 is switched to the waveform shaping circuit 15 side and the clamp circuit M6 is switched to the horizontal deflection circuit M4 side.
Further, the microprocessor 11 sends data to the oscillator 13a and outputs a clock signal Se that matches the horizontal oscillation frequency.
Generate. Therefore, the on-screen display circuit 13 at this time can stably display a predetermined error message on the display unit M1 at a predetermined portion in a predetermined size.

At this time, the microprocessor 11
When the changeover switch SW7 is opened to disconnect the video amplifier circuit M2 from the input terminal Ti, there is no external input signal, and the changeover switch SW1 is alternately switched, so that noise is generated in the line of the input terminal Ti. Even if mixed, it is possible to prevent unnecessary unsightly images from being displayed on the display unit M1.

On the other hand, the signal switching processing routine of FIG.
When the input signal deviates from the display specifications or becomes absent immediately after the power is turned on (program steps (4) and (8) in the figure), for example, the standby mode in which the horizontal size of the screen becomes the smallest The adjustment value data corresponding to the state is output to the DA converter 12 (12), and the video monitor M
Put the whole on standby. However, the operation at this time is
A predetermined error message may be output in the same manner as immediately after the power is turned on.

Next, when operating the adjusting function by the microprocessor 11, the operation switch SWa of the input operation unit 14 is pushed. At this time, the main processing routine of FIG. 3 recognizes that there is a key input (program step (5) in the same figure), and starts the key processing routine (11).

On the other hand, the key processing routine of FIG.
Recognizing that the key has been operated (program step (2) in the figure), the OSD key processing 1 routine is started (6). Therefore, the OSD key processing 1 routine of FIG. 7 is started, and in response to no menu (program step (1) in the same figure), the main menu is set and a display request is made to the on-screen display circuit 13 (7 ). This display request is checked by the program step (7) of the main processing routine of FIG.
The main menu is displayed on the display unit 1 through the program steps (3), (7), and (12) of the OSD display processing routine of FIG. 1 (FIG. 15A). At this time, since the selection item 1 is set by the program step (7) in FIG. 7, the cursor on the screen is
Is displayed (program steps (7) and (12) in FIG. 11), the system is set to the selection mode (program step (7) in FIG. 7).

Then, subsequently, the rotary encoder 1
When 4a is rotated to the right, for example, the rotary encoder 1
The output of 4a interrupts the encoder input interrupt routine of FIG. 4 (B), and the program recognizes that the rotary encoder 14a has been operated to rotate in the negative direction (program steps (2) and (3) in the same figure). , Encoder processing can be requested (4). As a result, the main processing routine of FIG. 3 checks the input from the rotary encoder 14a (program step (6) in the same figure) and starts the encoder processing routine (1
2). Therefore, the encoder processing routine of FIG. 9 confirms the selection mode (program step (3) in the same figure) and starts the encoder selection mode processing routine (6), and thereafter, the encoder selection mode processing routine of FIG. For the main menu (program step (1) in the figure), the selection items on the main menu can be arbitrarily selected according to the rotation direction and the rotation amount of the rotary encoder 14a ((4a) to (4
d)).

For example, selection item 1 on the main menu
When the operation switch SWa is selected by pressing, the program steps (5), (1
1), the OSD key processing 1 routine of FIG. 7 can be activated through the program steps (2) and (6) of FIG. 6, and the program steps (1), (2) and
The adjustment menu can be set via (4) (program step (8) in the figure). Therefore, the OSD display processing routine of FIG. 11 which is activated via the program steps (7) and (13) of FIG. 3 executes the adjustment menu display processing routine via the program steps (4) and (8) of FIG. It is activated (14). The adjustment menu display processing routine of FIG. 12 sets a large window of the same size as the main menu (2a) because the small menu is not specified (program step (1) in the figure).
Display the adjustment menu on the screen of display M1 ((2
b), FIG. 15 (B)).

At this time, the cursor on the adjustment menu is on the symbol representing the brightness (luminance) because the selection item 1 is set by the program step (8) in FIG.

Next, in this state, the rotary encoder 1
By rotating 4a, the same operation as in FIG.
The encoder processing routine is activated via the encoder input interrupt routine of (B) and the program steps (6) and (12) of the main processing routine of FIG. 3, and via the program steps (3) and (6) of FIG. The encoder selection mode processing routine of FIG. 10 can be activated.
However, since the encoder selection mode processing routine at this time corresponds to the adjustment menu (program step (2) in FIG. 10), the adjustment item on the adjustment menu is selected according to the rotation direction and the rotation amount of the rotary encoder 14a. Can be performed ((5a) to (5d)).

In the adjustment menu screen of FIG. 15B, from left to right, brightness, contrast, horizontal size, horizontal position, vertical size, vertical position, pincushion distortion,
Each adjustment item for trapezoidal distortion can be selected. The selected adjustment item is displayed by moving the cursor over the symbol, and the same symbol is displayed as a normal icon in the lower center of the adjustment menu screen corresponding to the selected adjustment item. (Program step (5e) in FIG. 12).

Therefore, when the horizontal item is selected as the adjustment item and the operation switch SWa is pressed, the program steps (5) and (11) in FIG. 3 and the program steps (2) and (6) in FIG. 6 are performed. The OSD key processing 1 routine is started via the program step (1) in FIG.
The OSD key processing 2 routine can be started via (2). Therefore, the OSD key processing 2 routine of FIG. 8 confirms that the horizontal size is selected in response to the adjustment menu (program step (1) in the same figure) (3a), and selects the entire adjustment mode from the adjustment mode. Can be switched to ((3b), (3d)).

Subsequently, when the rotary encoder 14a is rotated right and left, the encoder processing routine of FIG. 9 is started, and the horizontal size adjustment value data is increased or decreased according to the rotation direction and the rotation amount of the rotary encoder 14a.
It can be output to the converter 12 (program steps (1), (4a) to (4e) in the figure). Therefore,
Since the horizontal size of the adjustment cross-hatching screen displayed on the display unit M1 changes continuously from side to side, the horizontal size of the video monitor M can be easily adjusted to the optimum operating parameter. .

On the other hand, at this time, the OSD display processing routine of FIG. 11 has its program steps (4), (8),
Since the adjustment menu display processing routine is started via (14), the adjustment menu display processing routine of FIG.
According to the rotating operation of the rotary encoder 14a, the cursor indicating the horizontal size is blinked, and whether the adjustment value data is changing in the increasing direction or the decreasing direction can be displayed as an instruction icon (program step in the same figure). ((3) (5a) to (5d), FIG.
6 (A)). However, here, the instruction icon refers to a pair of arrow symbols displayed on both sides of the normal icon indicating the horizontal size symbol, and the outward instruction icon indicates the increasing direction of the adjustment value data. The inward pointing icon indicates the decreasing direction. Note that FIG. 16 also illustrates the normal icons and instruction icons of other adjustment items.

When the horizontal size adjustment is completed as described above, the operation switch SWa is pushed. As a result, the OSD key processing 2 routine is activated via the key processing routine of FIG. 6 and the OSD key processing 1 routine of FIG.
Program steps (1), (2), (3)) of FIG.
In the OSD key processing 2 routine of, the adjusted horizontal size adjustment value data is registered and stored in the non-volatile memory through the program steps (1), (3a) and (3b) in the same figure, and the entire selection mode is selected. (3c).

Then, similarly, thereafter, by operating the rotary encoder 14a and the operation switch SWa, other adjustment items on the adjustment menu are sequentially selected, and the adjustment work is advanced for each adjustment item, and the adjustment work is completed. can do. If the return symbol at the lower right of the adjustment menu screen is selected and the operation switch SWa is pressed, the screen returns to the main menu and other adjustment menus can be selected.

The microprocessor 11 presses any one of the operation switches SWb, SWb, ... Of the input operation unit 14 to operate the operation switches SWb, SWb ,.
It is possible to directly select a specific adjustment item corresponding to. For example, when the operation switch SWb corresponding to the adjustment item horizontal size is pressed, the key processing routine of FIG. 6, which is started by the main processing routine, recognizes that the horizontal size direct key has been pressed (see FIG. Program step (1)), put the whole in horizontal size direct mode adjustment mode ((3), (4
Since a) to (4e)) output the OSD display request (4f), the horizontal size can be immediately adjusted thereafter by the rotary encoder 14a. To cancel the horizontal size direct mode, the operation switch SWb corresponding to the horizontal size may be pressed again ((1), (3), (5a) to (5f)).

In addition to the horizontal size, each operation switch SWb is preferably associated with adjustment items such as brightness, horizontal position, vertical size, vertical position, and color temperature level. This is because these adjustment items need to be adjusted relatively frequently.

The microprocessor 11 may have a help message display function. However, here, the help message means a guide message that explains the technical contents of each adjustment item, the adjustment procedure, etc.
It is preferable to prepare adjustment items that are used relatively infrequently.

The help message display function can be activated by selecting a help item on a particular adjustment menu containing adjustment items that are used infrequently (program step (4a) in FIG. 8).
At this time, the whole is in help mode ((4
b), (4d)), the OSD display processing routine of FIG. 11 can display the help message on the display unit M1 by a predetermined number of lines from the display start line (program steps (4), (8) in the figure). ), (13)). At this time, the encoder processing routine of FIG. 9 corresponds to the rotation direction and rotation amount of the rotary encoder 14a,
The help message can be arbitrarily scroll-displayed (program steps (2), (5a) to (5g) in the figure).

The microprocessor 11 can make the adjustment work easier by reducing the size of the adjustment menu and displaying a large image for adjustment such as cross-hatching. That is, the microprocessor 11
Can have a function of changing the display size of the message information.

When the menu size is selected on the main menu and the operation switch SWa is pressed, the OSD key processing 1 shown in FIG. 7 is executed via the key processing routine.
The routine is started. The OSD key processing 1 routine is
When the menu size is selected on the main menu ((2), (4), (5)), the menu size is set (9). As a result, the OSD display processing routine of FIG. 11 activates the menu size display processing routine ((5), (15)). Therefore, the menu size display processing routine of FIG. 13 displays the menu size selection menu on the screen. ((1), FIG. 17).

Therefore, the small menu is selected by rotating the rotary encoder 14a (program steps (3), (6a) to (6 in FIG. 10)).
c)), when the operation switch SWa is pressed to store it (program steps (2), (5a) to (5c) in FIG. 8), the adjustment menu is
The size of the image becomes smaller (program steps (1), (4a), (4b) in FIG. 12), and the image for adjustment such as cross-hatching is hidden by the adjustment menu to the minimum necessary. In addition, the adjustment menu whose size has been reduced in this way consists of, for example, only a combination of a normal icon that is a symbol that indicates an adjustment item and an instruction icon that indicates the increasing or decreasing direction of the adjustment value data, and its display position. Also, by selecting the selection item 2 on the menu size selection menu, it is possible to arbitrarily select from the five positions of upper left, lower left, lower center, lower right, and upper right on the screen (FIG. 17). ).

In the above description, the adjustment items of the video monitor M that can be adjusted by the microprocessor 11 via the DA converter 12 are collectively shown in FIG. However, in FIG. 18, for contrast and automatic beam limiting, for example, by inputting the anode current of the color cathode ray tube M1a to the microprocessor 11, red, green,
By collectively controlling each of the blue gain levels by software, it is possible to remove them from independent adjustment items.

Further, the rotary encoder 14a is a set of two push button switches capable of designating the adjustment value data, that is, the operating parameter for increasing and decreasing directions, or
It can be replaced with an operation switch composed of one bidirectional switch. The operation switch at this time can correspond the number of operations or the operation time length to the rotation amount of the rotary encoder 14a, and operates either the increasing direction or the decreasing direction or in which direction. It can correspond to the direction of rotation.

[0062]

As described above, according to the present invention, by providing the microprocessor, the on-screen display circuit, and the input operation unit, the microprocessor can adjust the adjustment items through the on-screen display circuit. Since any message information necessary for adjustment work such as selection and setting of operation parameters can be displayed on the display section of the video monitor as an overlay, there is an excellent effect that the adjustment work can be performed accurately and efficiently. .

[Brief description of drawings]

FIG. 1 is an overall schematic block diagram

[Fig. 2] Detailed configuration block diagram of main parts

FIG. 3 Program flow chart (1)

FIG. 4 Program flow chart (2)

FIG. 5: Program flow chart (3)

FIG. 6 Program flow chart (4)

FIG. 7: Program flow chart (5)

FIG. 8: Program flow chart (6)

FIG. 9: Program flow chart (7)

FIG. 10: Program flow chart (8)

FIG. 11: Program flow chart (9)

FIG. 12: Program flow chart (10)

FIG. 13: Program flow chart (11)

[Fig. 14] Example of display message (1)

FIG. 15 is a display message example diagram (2)

FIG. 16 is a display message example diagram (3).

FIG. 17 is a display message example diagram (4).

[Fig. 18] Adjustment item list

[Explanation of symbols]

 M ... Video monitor M1 ... Display unit M2 ... Video amplification circuit M3 ... Vertical deflection circuit M4 ... Horizontal deflection circuit M5 ... Synchronous processing circuit M6 ... Clamp circuit Ti (i = 1, 2) ... Input terminals SWa, SWb ... Operation switch Sx Adjustment signal 11 Microprocessor 12 DA converter 13 On-screen display circuit 14 Input operation unit 14a Rotary encoder

Claims (11)

[Claims] 1. A microprocessor for sending an adjustment signal to a predetermined part of a video monitor through a DA converter, and an on-screen display for overlaying message information on a display part of the video monitor according to a display request from the microprocessor. A video monitor adjustment system comprising a circuit and an input operation unit connected to the microprocessor. 2. The adjustment system for a video monitor according to claim 1, wherein the input operation unit includes a combination of an operation switch and a rotary encoder. 3. The video monitor according to claim 2, wherein the microprocessor can display an instruction icon on a display unit according to an increasing direction and a decreasing direction of an operation parameter input via the rotary encoder. Adjustment system. 4. The video monitor according to claim 2, wherein the microprocessor has a help message display function, and a help message can be scroll-displayed via the rotary encoder. Adjustment system. 5. The adjusting system for a video monitor according to claim 2, wherein the microprocessor has a function of changing a display size of message information. 6. The adjustment system for a video monitor according to claim 2, wherein an operation switch capable of designating an increasing direction and a decreasing direction of an operation parameter is provided in place of the rotary encoder. . 7. The microprocessor is capable of measuring a vertical frequency and a horizontal frequency of an input signal and displaying an error message on a display unit when the input signal deviates from a display specification of a video monitor. 7. A video monitor adjusting system according to claim 1. 8. The adjusting system for a video monitor according to claim 7, wherein the microprocessor is capable of displaying an error message on the display when the input signal is not present. 9. The microprocessor, when outputting the error message, disconnects the horizontal deflection circuit from the synchronous processing circuit, specifies the horizontal oscillation frequency via the DA converter, and sets the vertical oscillation frequency to the horizontal oscillation frequency. 9. The adjusting system for a video monitor according to claim 7, wherein the clamp circuit is switched to the horizontal deflection circuit side following the adjustment. 10. The adjustment system for a video monitor according to claim 9, wherein the microprocessor disconnects the video amplifier circuit from the input terminal when outputting the error message. 11. The adjustment system for a video monitor according to claim 1, wherein the input operation unit includes an operation switch for directly selecting a specific adjustment item.