JP2701944B2 - Cathode ray tube display device - Google Patents

Description

The present invention relates to a cathode ray tube (CRT) display device,
In particular, the present invention is suitably applied to a display device capable of displaying different types of video signals.

[Related Art] In recent years, various information processing apparatuses (for example, personal computer apparatuses) have become widespread, and the format of an output video signal often differs between the various information processing apparatuses. Therefore, a CRT display device capable of displaying different types of video signals has already been proposed.

Note that the type of the video signal is different, for example, from the first type.
The second depends on whether the synchronization signal is separated from the video signal (so-called separate sync) or combined with the video signal (forming a composite video signal). Depends on the polarity of the synchronization signal, and thirdly, on the difference in horizontal or vertical synchronization frequency.

In a conventional CRT display device, a synchronous deflection unit and a video processing unit are separately provided for each type of video signal so that these plural types can display video signals. I was Although there is only one synchronous deflection unit and one video processing unit, the operation characteristics are changed by changing the value of the control signal for these units, so that a plurality of types of video signals can be displayed.

Here, the control signal given to the synchronous deflection unit and the video processing unit is stored as digital data corresponding to each type, detects the type of the incoming video signal, extracts data relating to the type, and converts this data. It was formed by digital / analog conversion. Therefore, display control data is stored in advance for each type.

[Problems to be Solved by the Invention] By the way, the optimum value for display control data is determined for each type, and differs for each type. But CR
Due to the product variation of the T display device, the optimum value differs depending on the product even for data for the same type of video signal.

Therefore, at the time of shipment, it is necessary to adjust display control data for each product.

However, CRs that display different types of video signals
In the case of the T display device, since there are many target video signals and many types of display control data, a lot of time and man-hours are required for the adjustment work.

Such inconvenience occurs not only in adjustment at the time of shipment but also in adjustment at the time of maintenance.

The present invention has been made in view of the above points,
An object of the present invention is to provide a CRT display device capable of adjusting display control data for performing display according to the type of an input video signal to an optimum value in a short time.

[Means for Solving the Problems] In order to solve the problems, in the present invention, display control data determined for each type of video signal is stored in advance, and the type of the input video signal is determined and In a cathode ray tube display device which displays display control data to be displayed and controls each means in accordance with the extracted data to display an input video signal, reference data of display control data is stored in advance for each type of video signal. When the mode for adjusting the video signal of the first type is instructed, the reference data of the display control data of the type is taken out, the display operation is performed, and the reference data is set according to the correction amount data given from the input operation means. And store it as display control data, as well as reference data for other types of video signals. The first adjustment means for forming and storing coarsely adjusted display control data by correcting the data according to the correction amount data, and the mode for adjusting a video signal of a type other than the first type are instructed. When the display control data of the type is coarsely adjusted, the display control data is taken out and the display operation is performed, and the display control data which is coarsely adjusted according to the correction amount data provided from the input operation means is corrected to obtain the final adjusted display control data. Second adjusting means for storing as control data.

[Operation] The present invention relates to a cathode ray tube display device capable of displaying different types of video signals,
In order to display different types of video signals, it stores display control data determined for each type, determines the type of input video signal, extracts display control data corresponding to that type, and sends it to each means. To display that type of video signal. That is, in the display device to which the present invention is applied, each means is used in common for a plurality of types of video signals, but the characteristic value at that time is changed based on the display control data, thereby responding to the type difference. is there.

The present invention is characterized by an adjustment configuration for storing an optimum value of the display control data in advance.

The first adjusting means stores in advance reference data of display control data for each type of video signal, and when a mode for adjusting the first type of video signal is instructed, display control data of that type is designated. The display data is retrieved and displayed, and the reference data is corrected according to the correction amount data provided from the input operation means and stored as display control data, and the reference data for other types of video signals is also corrected. The display control data corrected and roughly adjusted according to the amount data is formed and stored.

When a mode for adjusting a video signal of a type other than the first type is instructed, the second adjusting means extracts display control data of the type which has been roughly adjusted, performs a display operation, and is provided from the input operation means. The display control data roughly adjusted according to the correction amount data is corrected and stored as display control data.

When adjusting video signals of a type other than the first type by means of these adjustment means, adjustment from the coarsely adjusted display control data is sufficient, so that the adjustment time and man-hours are reduced compared to the past. Can be done.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a block diagram showing the configuration of this embodiment.
In FIG. 2, a CRT display device 20 of this embodiment is shown.
For example, in the form of a video signal from a video signal source 10 composed of a personal computer, etc.
Or, it is given in a composite form.

The CRT display device 20 includes an interface unit 21, a video processing unit 22, a synchronous deflection unit 23,
A CRT unit 24 and a high-pressure unit 25 are provided.

The interface unit 21 supplies the video signal among the signals supplied from the video signal generation source 10 to the video processing unit 22 and outputs the synchronization signal to the synchronization deflection unit 23.
To give.

The video processing unit 22 performs various processes such as amplification on the input video signal and applies the processed signal to the cathode of the CRT unit 24. The synchronous deflection unit 23 deflects the electron beam emitted from the cathode of the CRT unit 24 according to the input synchronization signal. High-pressure unit 25 is CR
Control the electron beam emitted from the cathode of the T section 24,
The high pressure necessary for acceleration or the like is supplied to the CRT unit 24.

In addition to the above-described basic configuration for realizing display, a configuration for controlling display so as to be appropriate in accordance with the type of an input video signal is provided. That is, a control unit 26, an adjusted data memory 28, a digital / analog (D / A) converter unit 30, a user control switch unit 31, and an encoder unit 32 are provided.

The interface unit 21 performs an operation of determining the type of a video signal and providing a determination code signal to the control unit 26 for such control, in addition to the above-described processing.

The control unit 26 is composed of, for example, a microcomputer with a built-in program. The control unit 26
In a normal operation mode (an adjustment mode described later as an operation mode corresponding thereto), while using a working memory 29 having a RAM configuration, the frequency of a synchronization signal given from the interface unit 21 is measured as digital data, and the frequency is measured. Control for outputting data to the D / A converter unit 30 and display control data corresponding to the discrimination code signal given from the interface unit 21 are taken out of the adjusted data memory 28 and output to the D / A converter unit 30. The control is performed.

The adjusted data memory 28 is a rewritable non-volatile memory such as an EEPROM, for example, and stores adjusted display control data corresponding to a plurality of video signal types as described above. . These data are adjusted as described later.

The D / A converter unit 30 converts the frequency data and display control data provided from the control unit 26 into analog signals, and supplies the analog signals as control signals to the respective circuits in the video processing unit 22 and the synchronous deflection unit 23. Things.

Here, the frequency data refers to measurement data of the horizontal synchronization frequency and the vertical synchronization frequency, and the display control data refers to the horizontal screen position, the horizontal screen size, the vertical screen position, the vertical screen size, the screen contrast, the brightness, and the like. Refers to data for screen distortion correction and the like.

By using such frequency data and display control data to control the circuit characteristics inside the video processing unit 22 and the synchronous deflection unit 23, a plurality of types of video signals can be displayed.

The user control switch unit 31 includes a plurality of switches, and a user operates one or more switches so as to obtain a desired screen while viewing the display screen. The data from the unit 31 indicates the amount by which the display screen is changed from the current state.

The encoder unit 31 outputs, to the control unit 26, instruction data (code) corresponding to the switch on which the user control switch unit 31 is pressed.
In the normal operation mode, the control unit 26 changes the data supplied to the D / A converter unit 30 by the amount of the instruction data.

By the way, even for CRT display devices of the same standard, the optimum value of the display control data differs depending on product variations. Therefore, as described above, such adjusted data for each product is stored in the adjusted data memory 28 in advance.

Therefore, the CRT display device is also provided with a configuration for adjustment.

Each of the units described above also functions at the time of adjustment, but some units are used only in the adjustment mode. That is, the reference data memory 27 and the mode determination port 33 are provided.

The mode determination port 33 receives a signal indicating the adjustment mode from the outside and provides the control unit 26 with the signal.

The control unit 26 is a component unit that performs the following processing from the viewpoint of the adjustment mode. First, a process of extracting reference data of display control data from the reference data memory 27 and outputting it to the D / A converter unit 30 is performed. Second, a process of taking in the instruction data adjusted by the user to the user control switch unit 31 via the encoder unit 32, changing the reference data by the instruction data, and outputting the reference data to the D / A converter unit 30 Do. Third, when the instruction from the user is completed, a process of writing the data at that time to the adjusted data memory 28 is performed. Fourthly, the adjusted data corresponding to the type of video signal directly instructed by the user or the temporarily adjusted (coarsely adjusted) data of another type of video signal is created from the instruction data at that time. .

The reference data memory 27 is formed of, for example, a ROM, and stores reference data of display control data for each type of video signal as described above. here,
As the reference data, a value determined from the standard (median of the allowable range of the standard) or an average value of data obtained for a plurality of past products is used.

In the adjustment mode, the user control switch unit 31 is used to indicate the amount by which the reference value data is changed. That is, it is used to create display control data.

Of course, the instruction from the user control switch unit 31 to the control unit 26 is transmitted to the encoder unit 32.
Is given by the code data.

Next, the processing executed by the control unit 26 will be described with reference to FIG.

The control unit 26 starts the processing of FIG. 1 when the power is turned on. First, the control unit 26 sets various flags and data to initial values, or when the power is cut off (FIG. 1 omits the processing when the power is cut off). (See FIG. 3), performs an initialization process of extracting various last data saved in a non-volatile memory (not shown, an adjusted data memory 28 may be used) and setting the same in the working memory 29 (step). SP1, SP2).

Next, the frequency of the synchronizing signal relating to the incoming video signal is measured, and the frequency data up to immediately before is taken out from the frequency data storage area of the memory 29 to detect the frequency change width (steps SP3 to SP5). Thereafter, it is determined whether or not this variation width is equal to or greater than a predetermined value (step SP
6). That is, it is determined whether or not the frequency difference at the detection timing of the successive frequencies is larger than a predetermined value. As a result of this determination, when it is determined that the frequency has become larger, the frequency data just measured is output to the D / A converter unit 30 and the frequency data just measured is stored in the frequency data storage area of the memory 29 (steps SP7 and SP8). ).

When the frequency data is updated in this manner, or when it is determined that the change width of the frequency is not large to a predetermined value,
The process proceeds to the next process not related to the frequency data.

Here, the predetermined value that determines whether or not to update the frequency data is a value that does not cause the frequency data to be updated in response to instantaneous frequency disturbance due to noise or fluctuation that is not an inherent change of the input frequency. Has been selected. That is, the selection is made to such an extent that the circuits in the video processing unit 22 and the synchronous deflection unit 23 are prevented from being switched unnecessarily and frequently due to noise or the like. Comparing with such a predetermined value means that a so-called dead zone is provided for frequency measurement.

When the control on the frequency data is completed, the control unit 26 determines the type of the input video signal (step SP
9). Then, it is determined whether or not the type has changed by comparing with the type in the previous determination (step SP10). as a result,
If the type of the input video signal is changed, the adjusted display control data relating to the detected new type of signal is extracted from the adjusted data memory 28 and output to the D / A converter unit 30 and the working memory 29 is output.
Is stored in the display control data storage area (steps SP11 and SP12).

If the input video signal type has not changed, and
When the display control data is updated in response to the type change, whether or not the adjustment mode has been instructed via the mode determination port 33, that is, whether the normal operation mode or the adjustment mode has been instructed, It is determined whether or not there is (step SP13).

As a result of the determination, when it is determined that the normal operation mode is instructed, it is further determined whether or not a code is given from the encoder unit 32 (step SP14).
That is, it is determined whether or not the user has operated any of the switches belonging to the user control switch unit 31. As a result, when it is determined that the user has not performed the control operation, the process returns to the frequency measurement processing in step SP3 described above. On the other hand, if it is determined that the user has performed the control operation, the display control data is changed by the operation and output to the D / A converter unit 30, and the changed data is stored in the working memory 29 for display control data. Store in area (Step SP
15, SP16).

Therefore, while the adjustment mode is not instructed, the control unit 26 performs a loop process including steps SP3 to SP14, or
The loop processing consisting of steps SP3 to SP16 is repeated.

When the operator instructs the adjustment mode from outside through the mode determination port 33 for the adjustment at the time of shipment or the adjustment at the time of maintenance, and the control unit 26 determines that the adjustment mode is instructed (see step SP13). Further, it is determined whether or not the initial adjustment flag is at a level instructing the end of the initial adjustment (step SP20). Here, the initial adjustment refers to the first adjustment performed on any one type of video signal after the adjustment mode is selected. The reason for this determination is that the processing of the first type of adjustment is slightly different from that of the other types of input signal adjustment performed thereafter. The initial adjustment flag is set in the initialization process (step
Set to a level indicating that the initial adjustment has not been completed in SP2).

If the initial adjustment flag indicates that the initial adjustment has not been completed, the control unit 26 extracts the reference data of the display control data corresponding to the type of video signal being processed from the reference data memory 27 and Output to the / A converter unit 30 (steps SP21 and SP22). As a result, the CRT unit 24 displays a display image in which reference display control has been performed on the type of video signal being input.

The operator operates the switches belonging to the user control switch unit 31 while looking at the display screen so that the displayed image becomes good. At this time, the control unit 26 changes the control data given to the D / A converter unit 30 according to the code from the encoder unit 32, and when the code from the encoder unit 32 is no longer given, When the adjustment operation is completed, the display control data at that time is stored in the area of the adjusted data memory 28 for the video signal of that type as the optimum data for the video signal of that type (step SP23).

Thereafter, difference data between the reference data and the stored optimum data is obtained (step SP24). Then the control unit
26 fetches reference data relating to another type of video signal from the reference data memory 27, corrects the fetched reference data according to the difference data obtained in the above processing, and temporarily adjusts the type of video signal. The adjusted data (coarsely adjusted data) is stored in each type of area of the adjusted data memory 28 (steps SP25 and SP26).

Here, a different correction method is used depending on the type of display control data. For example, in the case of a horizontal screen position or a vertical screen size, since the difference between reference data due to the difference in video signal type is linear, the difference data between the reference data obtained for a certain type of video signal and optimal data is obtained. Is used linearly in the calculation of other types of optimal data candidates. In the case of a horizontal screen size, the difference data is used in accordance with a quadratic curve to determine tentative optimum data for other types of video signals.

When the adjustment using one type of video signal is completed as described above and the reference data of another type of video signal is corrected based on the adjustment amount to determine display control data that has been coarsely adjusted, an initial value is obtained. The adjustment flag is set to a level indicating that the initial adjustment has been completed, and the above-described step SP3
Return to step SP27.

After the adjustment mode is instructed and a positive result is obtained in step SP13, if it is determined in the initial adjustment flag determination step that the initial adjustment has been completed, the control unit 26 determines the coarseness of the type of the input video signal. Read the adjusted display control data from the adjusted data memory 28
Output to D / A converter unit 30 (Steps SP30, S
P31).

While looking at the display screen at this time, the operator operates the switches belonging to the user control switch unit 31 to adjust the display image to be good (including the case where no adjustment is made). At this time, the control unit 26 The control data given to the D / A converter unit 30 is changed according to the code from the unit 32, and when the code from the encoder unit 32 is no longer given, that is, when the operator finishes the adjustment operation, Adjusted data memory for the video signal of that type as final adjusted data for the video signal of that type at the time of display control data
It is stored in area 28 (steps SP32 and SP33). Thereafter, the process returns to step SP3 described above.

Through the processing consisting of steps SP30 to SP33,
The final adjusted data of one type of video signal other than the type adjusted by the initial adjustment can be obtained. In practice, the final adjusted data for each type of video signal is determined using this processing system.

Here, since the adjustment in steps SP30 to SP33 is performed after the initial adjustment processing (steps SP21 to SP27), the adjusted data is further adjusted even for a video signal of a type that is not the target of the initial adjustment. In other words, the adjustment is easy.

Therefore, according to the above-described embodiment, shipping adjustment and maintenance adjustment of display control data for many types of video signals for each product can be performed easily and in a short time as compared with the related art. .

In the above-described embodiment, the CRT display device for the information processing device is described. However, the CRT display device for the television broadcast, and the CRT display device for both the television broadcast and the information processing device. It can be applied to a display device. This is because there are recently a plurality of television signal formats related to television broadcasting (NTSC system and high-vision system).

[Effects of the Invention] As described above, according to the present invention, the adjustment of the optimum value of the display control data stored in advance for each of a plurality of types of video signals can be performed in a shorter time and as compared with the related art. A CRT display device that can be easily performed and can be performed with a small number of steps can be obtained.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a processing procedure of an embodiment of a CRT display device according to the present invention, and FIG. 2 is a block diagram of the embodiment. 10 video signal source, 20 CRT display device, 21 interface unit, 22 video processing unit, 23 synchronous deflection unit, 24 CRT unit, 25
…… High voltage unit, 26 …… Control unit, 27 …… Reference data memory, 28 …… Adjusted data memory, 29 …… Working memory, 30 …… D / A converter unit, 31 ……
User control switch unit, 32 ... Encoder unit, 33 ... Mode determination port.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location H04N 5/46 H04N 5/46

Claims (1)

(57) [Claims] A display control data set for each of different types of video signals is stored in advance, a type of an input video signal is determined, corresponding display control data is taken out, and each means is selected according to the taken out data. In the cathode ray tube display device for controlling the display of the input video signal, the reference data of the display control data is stored in advance for each type of video signal, and a mode for adjusting the first type of video signal is instructed. When the reference data of the type is displayed, the reference data of the display control data is taken out, the display operation is performed, the reference data is corrected according to the correction amount data given from the input operation means, and stored as display control data. The reference data for the video signal is also adjusted according to the correction amount data, and the display is roughly adjusted. First to form and store control data
When a mode for adjusting a video signal of a type other than the first type is instructed, the display operation is performed by extracting the display control data of the type which has been roughly adjusted, and is provided from the input operation means. A cathode-ray tube display device comprising: a second adjusting unit that corrects the display control data that has been roughly adjusted according to the correction amount data and stores the corrected data as the finally adjusted display control data.