JPH0789673B2 - Monitor-TV system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial Field B Outline of Invention C Conventional Technology D Problems to be Solved by the Invention E Means for Solving Problems (FIG. 1) F Action G Example G ₁ Configuration of Monitor Television Device G ₂ Adjustment operation G ₃ Color gain and hue adjustment G ₄ White balance adjustment H Industrial effect A The present invention relates to a monitor television apparatus suitable for use as a master monitor of a television broadcasting station, for example. .

B Outline of the Invention The present invention is, for example, in a monitor television apparatus used as a master monitor of a television broadcasting station, photoelectrically converts light emitted from a color cathode ray tube surface to detect it, and stores this detection signal and a memory in advance. It is possible to automatically adjust the white balance by comparing it with a certain reference signal and adjusting the white balance by this comparison output signal, and anyone can easily adjust the white balance. It can be performed with high accuracy and in a short time.

C Conventional Technology Generally, in a monitor television device of a television broadcasting station, it is required to precisely adjust the white balance. Conventionally, a skilled engineer must use a color analyzer or an eye when adjusting the white balance. It is usually used and adjusted manually, and it is customary to spend several tens of minutes per monitor television device.

D. Problems to be Solved by the Invention Therefore, there are inconveniences that a skilled engineer is required to adjust the white balance, and that the adjustment takes time.

The present invention has been made in view of the above problems, and an object of the present invention is to enable anyone to perform accurate white balance adjustment in a short time.

E Means for Solving the Problems In order to solve the above problems, according to the present invention, a signal obtained by photoelectrically converting light emitted from a color cathode ray tube surface and a red, green and blue reference signal are provided. And a white balance is adjusted based on the comparison output of the monitor television device, wherein six reference signals of a high reference signal and a low reference signal of red, green, and blue for white are set to 1
A monitor television apparatus provided with a memory in which a plurality of sets are stored as a set, and a white reference signal can be selected according to the preference of a broadcasting station.

Further, according to the present invention, the work RAM for storing the data for adjustment, the content of the work RAM as an initial value is set, the content is rewritten by the comparison output signal, when the comparison results match, the It has a data RAM that transfers the contents to the work RAM, and after performing the coarse adjustment by specifying the address for performing the coarse adjustment of the work RAM and the data RAM, performing the fine adjustment by specifying the address for performing the fine adjustment. Provided is a monitor television device in which the white balance is adjusted by.

Furthermore, according to the present invention, the signal obtained by photoelectrically converting the light emitted from the color cathode ray tube surface is to emit red, green and blue monochromatic light sequentially on the tube surface to detect the light, the red color, A monitor television apparatus in which the green and blue detection signals are compared with the red, green and blue reference signals stored in advance in the memory, and white comparison is performed by the red, green and blue comparison outputs. I will provide a.

According to the present invention, the light emitted from the color cathode ray tube surface (1a) is photoelectrically converted and detected, and the detection signal and the memory (2) are stored in advance.
Since the white balance is adjusted so that the detected signal matches the reference signal stored in the above, the white balance can be automatically and precisely adjusted.

G Embodiment An embodiment of the monitor television apparatus of the present invention will be described below with reference to the drawings.

G ₁ Configuration of Monitor Television Apparatus FIG. 1 shows the configuration of a monitor television apparatus according to this example. In FIG. 1, (3) shows a video signal input terminal to which a video signal to be monitored is supplied. The video signal supplied to the video signal input terminal (3) is supplied to the switching device (4). Supply to the first fixed contact (4V). Further, (5) indicates a color bar signal generator for generating, for example, an SMPTE color bar signal, and the color bar signal from the color bar signal generator (5) is used as a second fixed contact (4c) of the switching device (4). (6) shows a white signal generation circuit, and this white signal generation circuit (6) receives a high level 100IR by a control signal from an I / O device (7) described later.
It is designed to switch between the white signal of E and the low white signal of low level 10 to 20 IRE. The output signal of the white signal generating circuit (6) is supplied to the third fixed contact (4W) of the switching device (4). The movable contact (4a) of the switching device (4) is controlled by a control signal from an I / O device (7), which will be described later, to provide first, second and third fixed contacts (4).
V), (4C) and (4W).

The signal obtained at the movable contact (4a) of the switching device (4) is supplied to a drive circuit (10) through a color gain and hue adjustment circuit (8) and a contrast and brightness adjustment circuit (9), and this drive circuit The red, green and blue signals obtained at the output side of (10) are respectively colored cathode ray tubes (1).
Of red, green and blue cathodes respectively.

In this example, the color bar signal obtained by the color gain and hue adjustment circuit (8) is detected by the level detection and comparison circuit (1).
Supply to 1). The level detection and comparison circuit (11) detects the level of only the blue component of the color bar signal, and during the color gain adjustment, the level of the blue component of the white portion W and the signal level of the blue portion B match. I / O to do
The color gain and the gain of the hue adjustment circuit (8) are controlled by the D / A conversion circuit (13) for operating the central processing unit (12) through the device (7) and converting a digital signal into an analog signal. To adjust. Also, when adjusting the hue, make sure that the level of the blue component of the white part W matches the level of the blue component of the magenta part M or the cyan part CY.
The central processing unit (12) is operated via the I / O device (7), and the hue is adjusted by the control signal from the DA conversion circuit (13). Further, the drive circuit (10) is adapted to sequentially supply the monochromatic signals of the red signal, the green signal and the blue signal to the switching color cathode ray tube (1) by the control signal from the I / O device (7) at the time of adjustment. ing.

Reference numeral (14) denotes a device (hereinafter referred to as "luminance detecting device") which is arranged on the tube surface (1a) of the color cathode ray tube (1) and detects the intensity of light emitted from the tube surface. The device (14) is composed of, for example, a phototransistor, and supplies the brightness detection signal obtained at the output side of the brightness detection device (14) to the preamplification and comparison circuit (15). In this case, the preamplification and comparison circuit (15) converts the brightness detection signal into a digital signal and compares it as a digital signal with a reference signal described later. Also (2)
Shows an EERPOM which constitutes a memory. In this EEPROM (2), a plurality of, for example, three sets of which are one set of six reference signals of red EEPROM, high reference signal of green and blue and low reference signal are stored. The white color can be selected according to the preference of the broadcasting station. This EEPROM
(2) and preamplification and comparison circuit (15) and control I /
The reference signal selected from the EEPROM (2) is connected to the O device (16) by a bus line, and the preamplification and comparison circuit (15) is used.
Are supplied to the I / O device (16).

This control I / O device (16) and central processing unit (12)
Is connected by a bus line to enable signal operation, and the central processing unit (12), DA converter circuit (13), work RAM (17), data RAM (18) and EEPROM.
(19) The ROM (20) and the I / O device are connected by a bus line so that signals can be transferred. In this case, the EEPROM (19) stores reference signals of a plurality of kinds, for example, three kinds of color temperatures, so that the color temperature can be selected according to the preference of the broadcasting station. The previous adjustment data is stored.

Further, the color gain and hue of the color gain and hue adjusting circuit (8) can be adjusted by the output signal of the DA converting circuit (13), and the driving circuit (by the output signal of the DA converting circuit (13) Adjust the gain and bias of 10).

G ₂ Adjustment Operation This example is configured as described above, and adjustment is performed according to the procedure shown in FIG.

That is, the adjustment is started, and the data RAM (18) is set first. This set of data RAM (18) stores the data stored in EEPROM (19) as shown in FIG.
Transfer data from (19) to work RAM (17), then
Data is transferred from the work RAM (17) to the data RAM (18), and then the I / O device (7) is set and used as an input.

Next, the color temperature is selected according to the preference of the broadcasting station. In this color temperature selection, as shown in FIG. 5, the broadcasting station specifies the color temperature number according to the preference, and the data of the specified number is transferred from the work RAM (17) to the data RAM (18),
After that, it has input.

G ₃ Color gain and hue adjustment Next, automatic color gain and hue adjustment, so-called color and hue adjustment, is performed. For this color gain and hue adjustment, first, the movable contact (4a) of the switching device (4) is connected to the second fixed contact (4c) by the control signal from the I / O device (7), and the color bar signal is applied to the color gain. And the hue adjustment circuit (8), and the level detection and comparison circuit (11) is supplied as shown in FIG.
The control signal from the I / O device (7) compares the level of the blue component of the color bar signal as shown in FIG. 2 with the level of the blue component of the white part W and the signal level of the blue part B. Each address of the work RAM (17) and the data RAM (18) for which the coarse adjustment of the color gain is to be performed is designated to perform a predetermined operation, and then the coarse adjustment of the color gain is performed by the focusing subroutine. This focusing routine first reads data from the work RAM (17) as shown in FIG.
Set the initial value of AM (18). In this case, the adjustment time can be shortened by setting the previous adjustment data as the initial value. In this focusing subroutine, the level detection and comparison circuit (1
It is determined whether the value obtained by subtracting the signal level of the blue portion B from the level of the blue component of the white portion W of the blue component of the color bar signal shown in FIG. When the subtracted value is negative (-), the data obtained by adding one step to the data at this time is added to the data RAM ( 18), adjust the color gain of the data RAM (18) and the color gain of the hue adjustment circuit (8), and after a predetermined time, repeat the above-mentioned operation in sequence, and the blue color of the white portion W When the component level and the signal level of the blue portion B become the same, the data of the data RAM (18) at that time is transferred to the work RAM (17), and the rough adjustment of the color gain is completed. Next, as shown in FIG. 6, the level detecting and comparing circuit (11) controls the blue component of the white component W of the level of the blue component of the color bar signal as shown in FIG. 2 by the control signal from the I / O device (7). And the level of the blue component of the cyan portion CY or magenta portion M are compared, and the work RAM (17) and the data RAM (1
8) Each hue, that is, an address for rough adjustment of hue is specified to perform a predetermined operation, and then the hue of the color gain and hue adjustment circuit (8) is adjusted by the focusing subroutine shown in FIG. 7 described above. , When the level of the blue component of the white part W and the level of the blue component of the cyan part CY or magenta part M match, the data of the data RAM (18) at that time is transferred to the work RAM (17), The coarse adjustment of is completed.

Then, fine adjustment of color gain is performed in the same manner as coarse adjustment of color gain. Then, the hue is finely adjusted in the same manner as the coarse hue adjustment. After that, the data in the EEPROM (19) is rewritten based on the data in the work RAM (17) to finish the color gain and hue adjustment.

G ₄ White balance adjustment Next, perform automatic white balance adjustment. To adjust the white balance, first set the movable contact (4a) of the switching device (4) to I /
By the control signal from the O device (7), the third fixed contact (4
W), 100IR from the white signal generation circuit (6)
The high white signal of E or the low white signal of 20IRE is supplied to the drive circuit (10) through the series circuit of the color gain and hue adjustment circuit (8) and the contrast and brightness adjustment circuit (9). This automatic white balance adjustment is performed by selecting a reference white reference signal set desired by the broadcasting station from among a plurality of reference signal sets stored in the EEPROM (2) as shown in FIG.
Transfer to M (17). Pre-amplification and comparison circuit (15)
The output signal of the brightness detecting device (14) for photoelectrically converting the light emitted from the tube surface (1a) of the color cathode ray tube (1) and detecting it as an electric signal is designated as the comparison signal of (1). Next work RAM
(17) and the data RAM (18) are designated to specify the address for rough adjustment of the red bias, and the white signal generating circuit () is operated by the control signal from the I / O device (7) to perform the predetermined operation. 6), for example, to generate a low white signal of 20IRE and to output only a red signal to the output side of the drive circuit (10), and to make the tube surface (1a) of the color cathode ray tube (1) red. I will do it. Also, specify the reference signal of the preamplification and comparison circuit (15) as the red low reference signal,
After that, the rough adjustment of the red bias is performed by the focusing subroutine as shown in FIG. In this case, when the automatic white balance is adjusted, the comparison circuit (11) of the focusing subroutine of FIG. 7 becomes the comparison circuit (15). That is, work RAM (1
Read the data from 7) and set the initial value of the data RAM (18). In this case, the adjustment time can be shortened by setting the previous adjustment data as the initial value. In this focusing subroutine, it is determined whether the value obtained by subtracting the level of the output signal of the luminance detecting device (14) from the level of the reference signal (now the red low reference signal) in the comparison circuit (15) is positive or negative. , Positive (+), one step is subtracted from the data at this time and this data is transferred to the data RAM (18), and the subtracted value is negative (-).
In this case, the data obtained by adding one step from the data at this time is transferred to the data RAM (18), and the red bias of the drive circuit (10) is set to D- by the data of this data RAM (18).
Adjustment is made via the A conversion circuit (13), and this operation is sequentially repeated, and the level of the red low reference signal and the luminance detection device (1
When the level of the output signal of 4) becomes the same, the data of the data RAM (18) at that time is transferred to the work RAM (17), and the rough adjustment of the red bias is completed.

Next, as shown in FIG. 8, work RAM (17) and data RAM
Designate the address to fine-tune each red bias in (18),
The red bias is finely adjusted in the same manner as described above. Next, as shown in FIG. 8, the addresses for the rough adjustment of the green bias of the work RAM (17) and the data RAM (18) are designated, and the predetermined operation is performed by this, and the I / O device (7 ) From the white signal generating circuit (6) to, for example, 20
A low white signal of IRE is generated, and only a green signal is output to the output side of the drive circuit (10) so that the tube surface (1a) of the color cathode ray tube (1) is made green. Further, the reference signal of the preamplification / comparison circuit (15) is designated as the green low reference signal, and then the green bias is roughly adjusted by the focusing subroutine shown in FIG. That is, first, the data is read from the work RAM (17) and the data RAM (18) is read.
Set the initial value of. In this case, the adjustment time can be shortened by setting the previous adjustment data as the initial value. In this focusing subroutine, it is judged whether the value obtained by subtracting the level of the output signal of the luminance detecting device (14) from the level of the reference signal (now green low reference signal) in the comparison circuit (15) is positive or negative. , When positive (+), subtract one step from the data at this time and transfer this data to the data RAM (18). When this subtracted value is negative (-), one step from the data at this time. The added data is transferred to the data RAM (18), and the green bias of the drive circuit (10) is adjusted by the data of the data RAM (18) via the D-A conversion circuit (13).
When this green low reference signal level becomes the same as the output signal level of the luminance detection device (14), the data in the data RAM (18) at that time is transferred to the work RAM (17). Then, the adjustment of the green bias pair is completed.

Next, as shown in FIG. 8, work RAM (17) and data RAM
Designate the address to perform each green bias fine adjustment of (18),
The green bias is finely adjusted in the same manner as described above. Next, as shown in FIG. 8, the addresses for the rough adjustment of the blue road bias of the work RAM (17) and the data RAM (18) are designated, and the predetermined operation is performed by this, and the I / O device ( The white signal generating circuit (6) is controlled by the control signal from 7), for example.
A low white signal of 20IRE is generated, and only a blue signal is output to the output side of the drive circuit (10) so that the tube surface (1a) of the color cathode ray tube (1) is blue. Also, the reference signal of the preamplification and comparison circuit (15) is designated as the blue low reference signal, and thereafter the blue bias is roughly adjusted by the focusing subroutine shown in FIG. That is, first, the data is read from the work RAM (17) and the data RAM (18) is read.
Set the initial value of. In this case, the adjustment time can be shortened by setting the previous adjustment data as the initial value. In this focusing subroutine, it is judged whether the value obtained by subtracting the level of the output signal of the luminance detection device (14) from the level of the reference signal (now the blue low reference signal) in the comparison circuit (15) is positive or negative. , When positive (+), subtract one step from the data at this time and transfer this data to the data RAM (18). When this subtracted value is negative (-), one step from the data at this time. The added data is transferred to the data RAM (18), and the blue bias of the drive circuit (10) is adjusted by the data of the data RAM (18) via the DA conversion circuit (13),
When this blue low reference signal level and the output signal level of the brightness detection device (14) become the same level by repeating this operation, the data of the data RAM (18) at that time is transferred to the work RAM (17). Then, the rough adjustment of the blue bias is completed.

Next, as shown in FIG. 8, work RAM (17) and data RAM
Designate the address to perform each blue bias fine adjustment of (18),
The blue bias is finely adjusted in the same manner as described above. Next, as shown in FIG. 8, the addresses for rough adjustment of the red gain of the work RAM (17) and the data RAM (18) are designated, and the predetermined operation is performed by this, and the I / O device ( The white signal generating circuit (6) is controlled by the control signal from 7), for example, 10
A high white signal of 0IRE is generated, and only a red signal is output to the output side of the drive circuit (10) so that the tube surface of the color cathode ray tube (1) is red. Further, the reference signal of the preamplification and comparison circuit (15) is designated as the red high reference signal, and thereafter, the red gain is roughly adjusted by the focusing subroutine shown in FIG. That is, first, the data is read from the work RAM (17) and the initial value of the data RAM (18) is set. In this case, the adjustment time can be shortened by setting the previous adjustment data as the initial value. In this focusing subroutine, it is judged whether the value obtained by subtracting the level of the output signal of the red color tube surface of the luminance detection device (14) from the level of the red high reference signal in the comparison circuit (15) is positive or negative, When it is positive (+), it is reduced by one step from the data at this time and this data is transferred to the data RAM (18). When this subtracted value is negative (-), one step is added from the data at this time. Transferred data to the data RAM (18),
The red-based gain of the drive circuit (10) is adjusted by the data of (18) through the D-A conversion circuit (13), and this operation is sequentially repeated to obtain the level of the red high reference signal and the brightness detection device (14). ) Output signal level is the same, the data in the data RAM (18) at that time is changed to the work RAM (1
7) to complete the rough adjustment of this red gain.

Next, as shown in FIG. 8, work RAM (17) and data RAM
Finely adjust the red gain in the same manner as above by designating the addresses for fine adjustment of the red gain in (18). Next, as shown in FIG. 8, the addresses for performing the rough adjustment of the green gain of the work RAM (17) and the data RAM (18) are designated, and the predetermined operation is performed by this, and the I / O device (7 ), The white signal generating circuit (6) is made to generate a high white signal of 100 IRE and the driving circuit (1
Only the green signal is output to the output side of (0) and the tube surface of the color cathode ray tube (1) is made green. Further, the reference signal of the preamplification and comparison circuit (15) is designated as the green high reference signal, and then the green gain is roughly adjusted by the focusing subroutine shown in FIG. That is, work RAM (1
Read the data from 7) and set the initial value of the data RAM (18). In this case, the adjustment time can be shortened by setting the previous adjustment data as the initial value. In this focusing subroutine, it is judged whether the value obtained by subtracting the level of the output signal of the green tube surface of the brightness detection device (14) from the level of the green high reference signal in the comparison circuit (15) is positive or negative, When positive (+), subtract 1 step from the data at this time
When it is transferred to RAM (18), and when this subtracted value is negative (-), the data obtained by adding one step to the data at this time is transferred to data RAM (18), and the data in this data RAM (18) is used. The green gain of the drive circuit (10) is adjusted via the D-A conversion circuit (13), and this operation is sequentially repeated.
When the level of the green high reference signal and the level of the output signal of the brightness detection device (14) become the same, the data of the data RAM (18) at that time is transferred to the work RAM (17) and the green gain The coarse adjustment of is completed.

Next, as shown in FIG. 8, work RAM (17) and data RAM
Finely adjust the green gain in the same manner as above by designating the addresses for fine adjustment of the green gain in (18). Next, as shown in FIG. 8, the addresses for performing the rough adjustment of the blue gain of the work RAM (17) and the data RAM (18) are designated, and the predetermined operation is performed by this, and the I / O device (7 ), The white signal generating circuit (6) is made to generate a high white signal of 100 IRE and the driving circuit (1
Only the blue signal is output to the output side of (0), and the tube surface of the color cathode ray tube (1) is blue. The reference signal of the preamplification and comparison circuit (15) is designated as the blue high reference signal, and then the blue gain is roughly adjusted by the focusing subroutine shown in FIG. That is, work RAM (1
Read the data from 7) and set the initial value of the data RAM (18). In this case, the adjustment time can be shortened by setting the previous adjustment data as the initial value. In this focusing subroutine, it is judged whether the value obtained by subtracting the level of the output signal of the blue tube surface of the luminance detection device (14) from the level of the blue high reference signal in the comparison circuit (15) is positive or negative, When positive (+), subtract 1 step from the data at this time
When it is transferred to RAM (18), and when this subtracted value is negative (-), the data obtained by adding one step to the data at this time is transferred to data RAM (18), and the data in this data RAM (18) is used. Adjust the blue gain of the drive circuit (10) via the D-A conversion circuit (13) and repeat this operation in sequence.
When the level of the blue high reference signal and the level of the output signal of the luminance detection device (14) become the same, the data of the data RAM (18) at that time is transferred to the work RAM (17) and the blue gain The coarse adjustment of is completed.

Next, as shown in FIG. 8, work RAM (17) and data RAM
Finely adjust the blue gain in the same manner as above by designating the addresses for fine tuning the blue gain in (18). When all the adjustments for red, green and blue are completed, this work
EEPROM (19) according to the data stored in RAM (17)
Rewrite this data of.

After that, if the color gain, hue and white balance are controlled based on the data stored in the EEPROM (19), it is possible to obtain a monitor television apparatus with accurate color gain, hue and white balance adjustment. In addition, since this adjustment is automatically performed, there is an advantage that anyone can perform the adjustment accurately and in a short time. Further, according to this example, the tube surface (1a) of the color cathode ray tube (1) emits monochromatic light sequentially in the order of red, green and blue, and the brightness thereof is detected, so that the brightness detecting device (14) is simple. The size of the device can be made smaller than that of a device that decomposes white into red, green, and blue with a filter, and there is no need to worry about the characteristics of the filter and the emission spectral characteristics of the phosphor of the cathode ray tube. You can make accurate adjustments.

Further, when the white balance of the monitor television apparatus according to this example is adjusted to the white balance of another standard monitor television apparatus, the color cathode-ray tube of this standard monitor television apparatus is sequentially changed to red, green, and low of the white signal. The brightness of each screen is sequentially detected by the brightness detection device (14) so as to obtain a red, green and blue 6-type screen of blue and high white signals, and a signal corresponding to the detected signal is stored in the EEPROM (2). Memorized in this EEPROM
If the above-mentioned adjustment is carried out using this signal stored in (2) as a reference signal, a white balance monitor television apparatus matched to this reference monitor television apparatus can be obtained.

The present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

H Effect of the Invention According to the present invention, the intensity (brightness) of light emitted from the tube surface (1a) of the color cathode ray tube (1) is detected, and this detection signal and the reference signal stored in the memory (2) in advance are used. Since the white balance is adjusted by comparing the above, the white balance adjustment can be automatically performed with high precision, and anyone can perform the adjustment with high precision in a short time. Further, according to the present invention, the color cathode ray tube surface (1a) sequentially emits red, green and blue monochromatic light, and since this brightness is detected, white is filtered by the brightness detecting device (14) as red, green, The device can be downsized compared to the one that decomposes in blue, and the adjustment can be performed easily and with high precision without paying attention to the characteristics of the filter and the emission spectral characteristics of the fluorescent substance of the cathode ray tube.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the monitor television apparatus of the present invention, FIG. 2, FIG. 3, FIG. 4, FIG. 5, and FIG.
FIG. 7, FIG. 7 and FIG. 8 are diagrams for explaining the present invention. (1) is a color cathode ray tube, (1a) is a tube surface, (2) and (19) are EEPROMs respectively, (3) is a video signal input terminal,
(4) is a switching device, (5) is a color bar signal generator,
(6) White signal generation circuit, (8) Color gain and hue adjustment circuit, (10) Drive circuit, (11) Level detection and comparison circuit, (12) Central processing unit, (13) D
-A conversion circuit, (14) luminance detector, (15) preamplification and comparison circuit, (17) work RAM, (18) data R
AM.

Continuation of the front page (56) References JP-A-54-144818 (JP, A) JP-A-54-105925 (JP, A) JP-A-54-31230 (JP, A) JP-A-61-113387 (JP , A) Actually open 60-129785 (JP, U) Actually open 60-132080 (JP, U)

Claims (3)

[Claims] 1. A signal obtained by photoelectrically converting light emitted from a color cathode ray tube surface and a reference signal of red, green and blue are compared,
In a monitor television apparatus in which the white balance is adjusted by the comparison output signal, a set of six reference signals of a high reference signal of red, green and blue and a low reference signal for white is set as a plurality of sets. A monitor television device that is equipped with a stored memory so that a white reference signal can be selected according to the preference of the broadcasting station. 2. A signal obtained by photoelectrically converting light emitted from a color cathode ray tube surface is compared with reference signals of red, green and blue,
In a monitor television device that adjusts white balance by the comparison output signal, the contents of the work RAM for storing the adjustment data and the work RAM as an initial value are set, and the contents are set by the comparison output signal. Data R that is rewritten and transfers the contents to work RAM when the comparison result matches.
With AM, the white balance is adjusted by specifying the address for coarse adjustment of the work RAM and the data RAM and performing the coarse adjustment, and then specifying the address for fine adjustment and performing the fine adjustment. A monitor television device characterized in that 3. The monitor television device according to claim 2, wherein the signal obtained by photoelectrically converting the light emitted from the color cathode ray tube surface is a monochromatic red, green and blue color on the tube surface. The emitted light is detected, and the light is detected, and the red, green, and blue detection signals are compared with the red, green, and blue reference signals stored in advance in the memory, respectively, and the red, green, and blue comparisons are made. A monitor television device characterized in that the white balance is adjusted according to the output signal.