JPH03118595A - Cathode-ray tube display device - Google Patents

Abstract

PURPOSE:To offer a CRT display device capable of adjusting and setting data for display control at the optimum value in a short time by storing the data for display control decided at every different kind of video signal in advance, and taking out and using corresponding data for display control by discriminating the kind of an inputted video signal. CONSTITUTION:A processing to take out the reference data of the data for display control from a reference data memory 27 and to output it to a D/A converter unit 30 is performed. A user performs a processing to fetch instruction data adjusted for a user control switching unit 31 via an encoder unit 32 and to output the reference data to the D/A converter unit 30 after varying the data by the instruction data. When an instruction from the user is completed, a processing to write the data at that time on an adjusted data memory 28 is performed. The adjusted data corresponding to the video signal directly instructed by the user or the data on which adjustment is applied once (coarsely adjusted) of another kind of video signal is generated from the instruction data at that time can be generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cathode ray tube (CRT) display device;
In particular, it is suitable for application to display devices that can display different types of video signals.

[Prior Art] Recently, various information processing devices (for example, personal computer devices) have become popular, and the format of an output video signal often differs depending on the various information processing devices.

Therefore, CRT display devices capable of displaying different types of video signals have already been proposed.

Note that the types of video signals are different, for example, firstly, 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), secondly due to the polarity of the synchronization signal, and thirdly due to differences in horizontal or vertical synchronization frequencies.

In order to be able to display such multiple types of video signals, conventional CRT display devices provide separate synchronous deflection units and video processing units for each type of video signal, and use these units by switching. was. Further, although there is only one synchronous deflection unit and one video processing unit, the values of control signals for these units are changed to change the operating characteristics, so that a plurality of types of video signals can be displayed.

Here, the control signals given to the synchronous deflection unit and the video processing unit are stored as digital data corresponding to each type, and the type of incoming video signal is detected, data related to that type is extracted, and this data is processed. 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 of display control data is determined for each type, and differs for each type.

However, due to product variations in CRT display devices, the optimal 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 displaying different types of video signals
In the T display device, since there are many video signals to be processed and many types of display control data, a lot of time and man-hours are required for the adjustment work.

Such inconveniences occur not only in adjustments at the time of shipment, but also in adjustments at the time of maintenance.

The present invention has been made in consideration of the above points, and it is an object of the present invention to adjust and set display control data to an optimal value in a short period of time for displaying according to the type of input video signal. The present invention aims to provide a CRT display device that can perform the following functions.

[Means for Solving the Problem] In order to solve the problem, in the present invention, display control data determined for each different type of video signal is stored in advance, and the type of input video signal is determined and dealt with. In a cathode ray tube display device that retrieves display control data to be used and displays an input video signal by controlling each means according to the retrieved data, standard data for display control data is stored in advance for each type of video signal. When the first type of video signal adjustment mode is instructed, the standard data of the display control I/roll data of the type is retrieved and displayed, and according to the correction amount data given from the input operation means. The reference data is corrected and stored as display control data, and the reference data for other types of video signals is also corrected according to the correction amount data to form roughly adjusted display control data and stored. When a mode for adjusting a video signal of a type other than the first type is instructed, the coarsely adjusted display control data of the relevant type is retrieved and displayed, and the data input from the input operation means is input. and second adjusting means for correcting the roughly adjusted display control data in accordance with the correction amount data and storing the corrected display control data as final adjusted display control data.

[Function] The present invention relates to a cathode ray tube display device capable of displaying different types of video signals, and in order to display different types of video signals, display control data determined for each type is stored. The device determines the type of input video signal, extracts display control data corresponding to the type, and supplies it to each means to display that type of video signal. That is, in the display device to which the present invention is directed, each means is used in common for multiple types of video signals, but the characteristic values at that time are changed based on display control data to accommodate the differences in types. be.

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

The first adjustment means stores reference data for display control data in advance for each type of video signal, and when a mode for adjusting the first type of video signal is instructed,
The reference data of the relevant type of display control data is extracted and displayed, the reference data is corrected according to the correction amount data given from the input operation means, and stored as display control data, and the reference data of the other type of video signal is The reference data for the display control I/roll is also corrected in accordance with the correction amount data to form and store coarsely adjusted display control I/roll data.

When a mode for adjusting a video signal of a type other than the first type is instructed, the second adjusting means takes out coarsely adjusted display control data of the type, performs a display operation, and receives data 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.

By making adjustments using these adjustment means, when adjusting video signals of a type other than the first type, adjustments can be made from roughly adjusted display control data, reducing adjustment time and man-hours compared to conventional methods. can be done.

[Example] Hereinafter, an example 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 2 of this embodiment is shown.
0 is a video signal provided from a video signal generation source 10, such as a personal computer, in a form in which a synchronization signal is separated or in a combined form.

This CRT display device 20 includes an interface unit 21, a heat treatment TI unit 22, a synchronous deflection unit 23, a CRT unit 24, and a high voltage unit 25.

The interface unit 21 connects the video signal source 10
Among the signals given from the above, the video signal is given to the video processing unit 22, and the synchronization signal is given to the synchronization deflection unit 23.

The video processing unit 22 performs various processing such as amplification on the input video signal and applies it 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 in accordance with the input synchronous signal. The high voltage unit 25 supplies the CRT section 24 with high voltage necessary for controlling and accelerating the electron beam emitted from the cathode of the CRT section 24 .

In addition to the above-mentioned basic configuration for realizing display, a configuration is provided for controlling the display so that it is appropriate depending on the type of input video signal. Namely, a control unit 26, a calibrated data memory 28, a digital/analog (D/A>converter unit 30, a user control switch unit 31 and an encoder unit 32) are provided.

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

The control unit 26 is composed of, for example, a microcomputer with a built-in program. In the normal operation mode (there is an adjustment mode described later as an operation mode for this), the control unit 26 uses the working memory 29 having a RAM configuration to convert the frequency of the synchronization signal given from the interface unit 21 into digital data. Control is performed to measure and output the frequency data to the D/A converter unit 30, and data for display control according to the discrimination code signal given from the interface unit 21 is retrieved from the adjusted data memory 28 and sent to the D/A converter. It controls the output to the unit 30.

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

The D/A converter unit 30 converts the frequency data and display control data provided from the control unit 26 into analog signals, and outputs the analog signals to the video processing unit 22.
and a controller I for each circuit in the synchronous deflection unit 23.
・It is supplied as a roll signal.

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

By controlling the internal circuit characteristics of the video processing unit 22 and the synchronous deflection unit 23 using such frequency data and display control data, it is possible to display a plurality of types of video signals.

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

The encoder unit 32 outputs instruction data (code) corresponding to the pressed switch of the user control switch unit 31 to the control unit 26. In the normal operation mode, the control unit 26 changes the data given to the D/A converter unit 30 by the amount of this instruction data.

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

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

Each of the units mentioned above also functions during adjustment, but
Some units are used only in adjustment mode. That is, a reference data memory 27 and a mode determination port 33 are provided.

The mode determination port 33 takes in a signal indicating the adjustment mode from the outside and supplies it to the control unit 26.

From the perspective of the adjustment mode, the control unit 26 is a constituent unit that performs the following processing. First, a process of extracting reference data for 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 importing instruction data adjusted by the user to the user control switch unit 31 via the encoder unit 32, varying the reference data by the amount of the instruction data, and outputting it to the D/A converter unit 30. Let's do it. Third, when the user's instruction is completed, a process is performed to write the data at that time into the adjusted data memory 28. Fourth, adjusted data corresponding to the type of video signal directly instructed by the user or somewhat adjusted (roughly adjusted) data for other types of video signals is created from the instruction data at that time. .

The reference data memory 27 is composed of, for example, a ROM, and stores reference data for display control data for each type of video signal, as described above. Here, as the reference data, a value determined from the standard (median value 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 to be changed. That is, it is used to create display control data.

Of course, instructions from the user control switch unit 31 to the control unit 26 are given as code data via the encoder unit 32.

Next, the processing executed by the control unit 26 will be explained using FIG. 1.

When the power is turned on, the control unit 26 starts the processing shown in FIG. Initialization processing is performed (step S.P.I.
5P2).

Next, the frequency of the synchronizing signal related to the incoming video signal is measured, and the frequency data up to the last minute is taken out from the frequency data storage area of the memory 29 to detect the range of frequency change (steps SP3 to SP5P5). after that,
It is determined whether this variation range is greater than or equal to a predetermined value (step 5P6).

That is, it is determined whether the frequency difference at the detection timing of successive frequencies is larger than a predetermined value. As a result of this determination, if it is determined that the frequency has increased, the just-measured frequency data is output to the D/A converter unit 30, and the just-measured frequency data is stored in the frequency data storage area of the memory 29 (step SP7.5P8). ).

When the frequency data is updated in this way, or when it is determined that the frequency change range is not as large as a predetermined value, the process proceeds to the next process that is not related to the frequency data.

Here, the predetermined value for determining whether or not to update the frequency data is a value that prevents the frequency data from being updated in response to instantaneous frequency disturbances due to noise or fluctuations that are not original changes in the input frequency. has been selected. That is, the video processing unit 22 and the synchronous deflection unit 23
The selection is made to prevent the internal circuit from being switched unnecessarily and frequently due to noise or the like. Comparison with such a predetermined value means that a so-called dead zone is provided in frequency measurement.

After controlling the frequency data, the control unit 26 determines the type of input video signal (step 5).
P9). Then, it is determined whether the type has changed by comparing it with the type at the previous determination (step 5 PIO). As a result, when the type of input video signal changes, adjusted display control data for the detected new type of signal is retrieved from the adjusted data memory 28.
It is output to the /A converter unit 30 and stored in the display control data storage area of the working memory 29 (Steps 5PII, 5P12>).

If the type of input video signal has not changed, and if the display control data has been updated in response to the change in type, then whether or not the adjustment mode has been instructed via the mode determination board 33 is determined. That is, it is determined whether the normal operation mode or the adjustment mode is instructed (step 5P13).

As a result of this determination, if 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 5P14).
). That is, it is determined whether the user has operated any switch belonging to the user control switch unit 31.

As a result, if it is determined that the user has not performed any control operation, the process returns to the frequency measurement process of step SP3 described above. On the other hand, when it is determined that the user has executed a control operation, the display control data is changed only for that operation bone and outputted to the D/A converter unit 30, and the changed data is stored in the working memory 29 for display control. It is stored in the data storage area (steps 5P15 and 5P16).

Therefore, while the adjustment mode is not instructed, the control unit 26 performs the loop processing consisting of steps SP3 to 5PL4.
Alternatively, the loop processing consisting of steps SP3 to SP5P16 is repeated.

For adjustment at the time of shipping or adjustment during maintenance, the operator instructs the adjustment mode from the outside via the mode determination board 33, and the control unit 26 determines that the adjustment mode has been instructed (see step 5P13). , Furthermore, it is determined whether the initial adjustment flag is at a level that instructs the end of the initial adjustment (Step 5P20>.Here,
Initial adjustment refers to the first adjustment performed on any one type of video signal after the adjustment mode is selected.

This determination is made because the processing is somewhat different between the first type of adjustment and the subsequent adjustment of other types of input signals. Note that the initial adjustment flag is set to a level indicating that the initial adjustment has not been completed in the initialization process (see step SP2).

If the initial adjustment flag indicates that the initial adjustment has not been completed, the control unit 26 retrieves the reference data of the display control data corresponding to the type of video signal being processed from the reference data memory 27, and /A output to converter unit 30 (step 5P21.5P2
2>. As a result, a display image obtained by applying standard display control to the type of video signal being input is displayed on the CRT section 2.
Displayed by 4.

While viewing this display screen, the operator operates the switches belonging to the user control switch unit 31 to improve the displayed image. At this time, the control unit 26 varies 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, that is, when the operator When the adjustment operation is completed, the display control data at that time is stored as optimal data for the type of video signal at that time in the area of the adjusted data memory 28 for that type of video signal (step 5).
P23>.

Thereafter, difference data between the reference data and the stored optimal data is obtained (step 5P24). Next, the control unit 26 retrieves the reference data regarding the other type of video signal from the reference data memory 27 and corrects the retrieved reference data according to the difference data obtained in the above processing to obtain the reference data for the video signal of that type. It is stored in each type of area of the adjusted data memory 28 as data that has undergone some adjustment (roughly adjusted data) (steps 5P25 and 5p2).
6>.

Here, different correction methods are used depending on the type of display control data. For example, in the case of horizontal screen position or vertical screen size, the difference between reference data due to different video signal types is linear, so the difference data between reference data and optimal data obtained for a certain type of video signal is used linearly to calculate other types of i-suitable data candidates. Also, if the horizontal screen size is
The difference data is used according to a quadratic curve to determine prima facie optimal data for other types of video signals.

In this way, the adjustment using one type of video signal is completed, and the reference data of the other types of video signals are corrected based on this adjustment amount to determine coarsely adjusted display control data. The adjustment flag is set to a level indicating that the initial adjustment has been completed in step SP3 described above.
Return to (Step 5P27>).

After the adjustment mode is instructed and a positive result is obtained in step 5P13, if it is determined in the initial adjustment flag determination step that the initial adjustment has been completed, the control unit 26 controls the coarse The adjusted display control data is read from the adjusted data memory 28 and output to the D/A converter unit 30 (steps 5P30 and 5P31). (including cases in which the display image is not properly adjusted by operating the switch), at this time, the control unit 26 sends control data to the D/A converter unit 30 in accordance with the code from the encoder unit 32. When the code from the encoder unit 32 is no longer applied, i.e. when the operator has completed the adjustment operation, the current display control data is converted to the final adjusted value for the current type of video signal. The adjusted data corresponding to that type of video signal is stored as data in the area of the memory 28 (step 5P32.
5P33). Thereafter, the process returns to step SP3 described above.

Through the processing of steps 5P30 to 5P33, final adjusted data of one type of video signal other than the type adjusted in the initial adjustment can be obtained. In practice, this processing system is used to determine the final adjusted data for each type of video signal.

Here, since the adjustments made in steps 5P30 to 5P33 are performed after the initial adjustment processing (steps 5P21 to 5P27), the adjusted data is further adjusted even for types of video signals that are not subject to the initial adjustment. This makes the adjustment easy.

Therefore, according to the above-described embodiment, shipping adjustment and maintenance adjustment for each product of display control data for many types of video signals can be executed more easily and in a shorter time than in the past. .

In addition, in the above-mentioned embodiment, a CRT display device intended for information processing equipment was shown, but a CRT display device intended for television broadcasting, or a CRT display device intended for both television broadcasting and information processing equipment is also applicable. It can be applied to display devices. This is because recently there are multiple television signal formats for television broadcasting (NTSC system and high-definition system).

[Effects of the Invention] As described above, according to the present invention, it is possible to adjust the optimal value of display control data stored in advance for each of multiple types of video signals in a shorter time and It is possible to obtain a CRT display device that can be easily manufactured and can be manufactured with fewer man-hours.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the 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. DESCRIPTION OF SYMBOLS 10... Video signal generation source, 20... CRT display device, 21... Interface unit, 22
... video processing unit, 23 ... synchronous deflection unit, 24 ... CRT section, 25 ... high voltage unit, 2
6...Control unit, 27...Reference data memory, 2
8... Adjusted data memory, 29... Working memory, 30... D/A converter unit, 31.
...User control switch unit, 32...
Encoder unit, 33...mode determination port.

Claims (1)

[Claims] Display control data determined for each different type of video signal is stored in advance, and the type of input video signal is determined and the corresponding display control data is extracted,
In a cathode ray tube display device that displays input video signals by controlling each means according to retrieved data, reference data for the display control data is stored in advance for each type of video signal, and the reference data for the first type of video signal is When a mode for adjusting the signal is instructed, the reference data of the relevant type of display control data is retrieved and displayed, and the reference data is corrected according to the correction amount data given from the input operation means to display the display control data. The first controller stores the reference data for other types of video signals in accordance with the correction amount data to form coarsely adjusted display control data and stores the same.
When a mode for adjusting a video signal of a type other than the first type is instructed, the coarsely adjusted display control data of the type is retrieved and displayed, and the input operation means outputs the coarsely adjusted display control data. A cathode ray tube display device comprising: second adjusting means for correcting display control data roughly adjusted in accordance with correction amount data and storing the corrected display control data as final adjusted display control data.