JPH0944111A - Picture quality adjusting method for crt display screen and its circuit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust a deficiency in the brightness of a screen at the time of switching to a dynamic image by adjusting the control electrode voltage and the cathode voltage with picture quality adjustment data that are read out and adjusting brightness priority by raising the brightness of the CRT display screen, when switched from a still image to a dynamic image. SOLUTION: When a luminance level is increased for a display of the moving picture, G1 voltage data read out of the memory 15 of a microcomputer 14a are altered with a user switch 12 for G1 voltage adjustment to read a higher G1 voltage, and cathode voltage data read out of the memory 15 are altered with a user switch 13 for cathode voltage adjustment to read a lower cathode voltage, thereby decreasing the potential difference between the G1 voltage and cathode voltage. At this time, screen voltage data read out of the memory 15 is placed in an optimum spot cutoff state with a higher screen voltage by using a user switch 11 for screen voltage adjustment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CRT driving a CRT.
The present invention relates to a method for adjusting the image quality of a CRT display screen in an RT drive circuit and its circuit device.

[0002]

2. Description of the Related Art FIG. 8 is an electric circuit diagram showing a configuration of a CRT drive circuit having a conventional image quality adjusting circuit device for a CRT display screen. In the figure, 1 is a video preamplifier for amplifying a video signal, and 2 is a video preamplifier 1.
Is a cut-off control circuit for adjusting the DC potential of the video signal amplified by the video main amplifier 2 and supplying it to the cathode electrode of the CRT. Reference numeral 4 is a flyback transformer for supplying a high voltage to the anode electrode of the CRT, and 5 is a screen voltage generation circuit for supplying the screen voltage to the screen electrode of the CRT. 5a is an operational amplifier, 5b is an operational amplifier 5a
Is a variable resistor for supplying a set voltage to the non-inverting input terminal of the. 6 is a horizontal output transistor, 7 is a diode, 8 is a capacitor, and 9 is a G1 that generates a G1 voltage of a CRT control grid (hereinafter referred to as a G1 electrode).
It is a voltage generation circuit. Reference numeral 9a is a variable resistor for setting the G1 voltage. Reference numeral 10 is a contrast volume 1 for adjusting the contrast of the CRT display screen.
0a, a contrast / bright adjustment circuit having a bright volume 10b for adjusting the brightness of the CRT display screen.

Next, the operation will be described. The video signal is pre-amplified by the video preamplifier 1 and further amplified by the video main amplifier 2 to be cut-off control circuit 3
Supplied to Since the video main amplifier 2 and the cutoff control circuit 3 are coupled by the coupling capacitor C1, and the DC component of the video signal is cut by this coupling capacitor C1, the cutoff control circuit 3 uses the bright volume 10b. The DC bias adjusted by is superimposed on the video signal to adjust the cutoff point of the video signal, and the cutoff point is supplied to the cathode electrode (not shown) of the CRT. Further, from the secondary side of the flyback transformer 4, a high voltage generated based on the horizontal synchronizing signal of the video signal is supplied to an anode electrode (not shown) of the CRT. Also, from the screen voltage generation circuit 5,
A screen voltage is supplied to a screen electrode (not shown) of the CRT. Further, the G1 voltage adjusted by the variable resistor 9a is supplied from the G1 voltage generating circuit 9 to the G1 electrode (not shown) of the CRT.

Further, the high voltage pulse on the primary side of the flyback transformer 4 is rectified by the diode D1 and the capacitor C2 and supplied to the screen voltage generating circuit 5. In the screen voltage generating circuit 5, the high voltage pulse is applied to the non-inverting input terminal of the operational amplifier 5a. A screen voltage corresponding to the set voltage is generated and supplied to a screen electrode (not shown) of the CRT.

Further, the negative pulse generated in the tertiary winding of the flyback transformer 4 is rectified by the diode D2 of the G1 voltage generating circuit 9, and the G1 voltage set by the variable resistor 9a is converted into the G1 voltage generating circuit 9. To a screen electrode (not shown) of the CRT.

In this CRT drive circuit, the contrast, which is an image quality adjusting circuit device for the CRT display screen, is used.
The cathode adjustment voltage of the CRT, the G1 voltage, and the screen voltage are preset by the bright adjustment circuit 10 and the variable resistor 9a of the G1 voltage generation circuit 9 and the variable resistor 5b of the screen voltage generation circuit 5 so that the focus is in the best state. To do. The brightness of the display screen at this time is supplied to the cathode electrode by supplying the DC voltage adjusted by the contrast volume 10a and the brightness volume 10b of the contrast / bright adjustment circuit 10 to the video preamplifier 1 and the cutoff control circuit 3. The cut-off point of the video signal to be adjusted is adjusted, and a still image is often displayed especially on a CRT display such as a personal computer. Therefore, in order to prevent the deterioration of the fluorescent screen of the screen, the focus is relatively reduced within a range where focus does not deteriorate. Adjusted to a lower brightness level.

[0007]

Since the conventional image quality adjusting circuit device for the CRT display screen is constructed as described above, the cathode voltage, the G1 voltage, and the screen voltage are given priority to focus on a still screen of a personal computer or the like. When set to, there is a problem in that when a moving image such as a television screen is displayed, the brightness level of the display screen is adjusted to be low, so that the display screen becomes dark.

Further, the contrast / bright adjustment circuit 1 constituting the image quality adjustment circuit device for the CRT display screen.
It is necessary to adjust the contrast volume 10a of 0, the bright volume 10b, the variable resistor 9a of the G1 voltage generating circuit 9 and the variable resistor 5b of the screen voltage generating circuit 5, respectively. There was a problem that it was not easy to restore the balance.

The present invention has been made in order to solve the above-mentioned problems, and screen adjustment is performed in which priority is given to focus when displaying a still image and priority is given to brightness when displaying a moving image. An object of the present invention is to provide a method of adjusting the image quality of a CRT display screen and a circuit device thereof that can be easily performed.

[0010]

The C according to the first aspect of the present invention.
The image quality adjustment method of the RT display screen is performed by reading the image quality adjustment data of the CRT display screen stored in advance by operating a user switch, adjusting the control electrode voltage and the cathode voltage based on the read image quality adjustment data, and displaying a moving image. It is provided with a configuration for increasing the brightness of the CRT display screen when displaying.

In the image quality adjusting method for a CRT display screen according to a second aspect of the present invention, image quality adjusting data for prioritizing the focus of the CRT display screen is stored in advance, and a still image is displayed on the CRT display screen. Reads the stored image quality adjustment data, sets a control electrode voltage and a cathode voltage according to the read image quality adjustment data to give priority to focus, and in the case of a moving image, gives priority to the read and set focus image quality adjustment. The data is changed by the user switch to increase the brightness of the screen.

In the image quality adjusting method for the CRT display screen according to the third aspect of the present invention, the image quality adjusting data for controlling the image quality of the CRT display screen to the optimum state is stored in advance and the user switch is operated once. CR
The image quality adjustment data for controlling the image quality of the T display screen to the optimum state is read out, and either or both of the control electrode voltage and the cathode voltage are adjusted to adjust the brightness of the CRT display screen switched from the still image to the moving image. It is equipped with a raising mechanism.

According to a fourth aspect of the present invention, a CRT display screen image quality adjusting method adjusts a control electrode voltage and / or a cathode voltage by operating a variable resistor opened to a user to display a moving image. It is provided with a configuration for adjusting the brightness of the CRT display screen when displaying.

According to a fifth aspect of the present invention, there is provided a method for adjusting the image quality of a CRT display screen, wherein when priority is given to focus in advance, an image quality adjustment value for controlling the image quality of the CRT display screen to the best state and brightness are given priority. The image quality adjustment value for controlling the CRT display screen to the optimum state is set in analog, and the CRT is switched from a still image to a moving image by operating a user switch.
A configuration is provided in which the image quality adjustment value that gives priority to brightness on the display screen is selected, and either or both of the control electrode voltage and the cathode voltage are adjusted to increase the brightness of the CRT display screen that displays a moving image. It is a thing.

In the image quality adjusting method for a CRT display screen according to the invention of claim 6, the image quality adjusting data of the CRT display screen stored in advance is read by operating a user switch, and the control electrode voltage and the control electrode voltage are read according to the read image quality adjusting data. The configuration is such that the cathode voltage and the screen voltage are adjusted to increase the brightness of the CRT display screen when displaying a moving image.

According to a seventh aspect of the present invention, there is provided a method for adjusting image quality of a CRT display screen, wherein image quality adjustment data such as a control electrode voltage which prioritizes the focus of the CRT display screen, the DC bias applied to the cathode electrode, and a screen voltage. Is changed by reading the user's switch by operating the user switch, and the brightness of the CRT display screen switched from the still image to the moving image is increased for adjustment.

In the image quality adjusting method for the CRT display screen according to the present invention, the image quality adjusting data for controlling the image quality of the CRT display screen to the optimum state is stored in advance and the user switch is operated once. CR
The CRT display screen in which the image quality adjustment data for controlling the image quality of the T display screen is read out, the control electrode voltage and / or the cathode voltage and / or the screen voltage are adjusted, and the still image is switched to the moving image. The image quality adjustment data for controlling the image quality of the above item to increase the brightness of the screen is provided.

According to a ninth aspect of the present invention, there is provided a method for adjusting the image quality of a CRT display screen, wherein the image quality adjustment value for controlling the image quality of the CRT display screen in the best state when the focus is prioritized, and the brightness when the priority is given. The CR
The image quality adjustment value for controlling the T display screen to the optimum state is preset in advance in an analog manner, and when the CRT display screen displays a moving image, the brightness of the image quality of the CRT display screen is prioritized by operating the user switch. The image quality adjustment value is selected, the control electrode voltage, the DC bias applied to the cathode electrode, and the screen voltage are adjusted to increase the brightness of the CRT display screen.

According to a tenth aspect of the invention, there is provided an image quality adjusting method for a CRT display screen, which adjusts a control electrode voltage and / or a cathode voltage and / or a screen voltage by operating a variable resistor opened to the user. It is provided with a configuration for adjusting the brightness of the CRT display screen when displaying a moving image.

In the image quality adjusting method for a CRT display screen according to an eleventh aspect of the present invention, the relationship between the screen voltage, the control electrode voltage, and the cathode voltage is set to the CR value.
Image quality adjustment data necessary to control the screen voltage, the control electrode voltage, and the cathode voltage in the "focus priority" by specifying the T display,
Alternatively, image quality adjustment data necessary for controlling the screen voltage, the control electrode voltage, and the cathode voltage in the case of "brightness priority" is stored in advance, and these image quality adjustment data are read out by operating the user switch to display a still image. In the case of, the focus is prioritized, and in the case of a moving image, the brightness of the screen is increased to adjust the CRT display screen to "brightness priority".

According to a twelfth aspect of the present invention, there is provided a method for adjusting the image quality of a CRT display screen, wherein a load resistance value of a main amplification circuit for amplifying a video signal is adjusted by operating a user switch, and a load image of a moving image is compared with a still image. It is provided with a structure that raises the brightness at that time.

According to a thirteenth aspect of the present invention, there is provided an image quality adjusting circuit device for a CRT display screen, which includes a DC bias applied to the cathode electrode and a control electrode voltage and a screen voltage applied to the pre-stored screen for the best focus. A user switch for performing selection and selection of the DC bias, the control electrode voltage, and the screen voltage when giving priority to brightness based on each voltage for making the focus the best state, and the user switch. Read-out means for reading the selected DC bias value, the control electrode voltage and the screen voltage, and the cut-off control circuit and the control for the DC bias value, the control electrode voltage and the screen voltage read by the read-out means. Electric It is obtained by a voltage supply means for supplying each voltage generating circuit and the screen voltage generating circuit.

In the image quality adjusting circuit device for a CRT display screen according to the fourteenth aspect of the present invention, the focus of the CRT display screen is prioritized, and the DC bias and the control electrode voltage applied to the cathode electrode for bringing the focus into the best state, The screen voltage and the brightness of the CRT display screen are given priority, and the CRT
Storage means for storing the values of the DC bias applied to the cathode electrode and the control electrode voltage and the screen voltage in order to maximize the brightness of the display screen,
Each value of the DC bias and the control electrode voltage and the screen voltage for making the focus the best state from the storage means, or the DC bias, the control electrode voltage and the screen voltage for optimizing the brightness of the CRT display screen. And a user switch for selecting and reading each value of 1 by one operation.

An image quality adjusting circuit device for a CRT display screen according to a fifteenth aspect of the present invention is to set a DC bias applied to the cathode electrode and a control electrode voltage and a screen voltage for making the focus the best state.
A variable resistor open to the user for setting a DC bias applied to the cathode electrode for making the brightness of the CRT display screen the best and setting each value of the control electrode voltage and the screen voltage. Is.

According to a sixteenth aspect of the present invention, there is provided an image quality adjusting circuit device for a CRT display screen, wherein a focus priority variable resistor for setting a DC bias and a control electrode voltage and a screen voltage applied to the cathode electrode for achieving the best focus. And a brightness priority variable resistor for setting each voltage value of a DC bias applied to the cathode electrode and a control electrode voltage and a screen voltage for optimizing the brightness of the CRT display screen, and the focus priority variable. A user switch for switching between the resistor and the brightness-priority variable resistor in accordance with "focus priority" or "brightness priority" is provided.

The image quality adjusting circuit device for a CRT display screen according to the seventeenth aspect of the present invention relates to the relationship between the screen voltage, the control electrode voltage and the cathode voltage for the CRT display in the "focus priority" and "brightness priority". Storage means for storing the image quality adjustment data necessary to control the screen voltage, the control electrode voltage, and the cathode voltage obtained by previously specifying
Image quality adjustment data reading means for reading the image quality adjustment data in the "focus priority" or the image quality adjustment data in the "brightness priority" stored in the storage means based on the operation of the user switch. It is a thing.

An image quality adjusting circuit device for a CRT display screen according to an eighteenth aspect of the present invention comprises an adjusting means for adjusting a load resistance value of a main amplifying circuit for amplifying a video signal based on an operation of a user switch. .

[0028]

According to the method of adjusting the image quality of the CRT display screen in the first aspect of the invention, a user switch is operated to read the stored image quality adjustment data of the CRT display screen, and the control electrode voltage and the control electrode voltage are read according to the read image quality adjustment data. Adjust the cathode voltage and increase the screen brightness to compensate for the lack of brightness of the screen when the CRT display screen is switched from the still image to the moving image display, and to display the still image and the moving image. Facilitates adjustment.

In the image quality adjusting method for the CRT display screen according to the second aspect of the present invention, the user switch is operated to read the image quality adjustment data which is stored in advance and which gives priority to the focus of the CRT display screen, and controls by the read image quality adjustment data. The electrode voltage and the cathode voltage are set, the state of the CRT display screen that displays a still image is set to "focus priority", and the user switch is operated to display the moving image to change the image quality adjustment data. , The state of the CRT display screen is set to "brightness priority", and when returning to the display screen of the original still image, the focus is prioritized by performing the operation opposite to the operation of the user switch when the change is made. It makes it easy to adjust the screen state when the brightness is prioritized.

According to a third aspect of the present invention, there is provided a method for adjusting the image quality of a CRT display screen by reading out image quality adjustment data for preliminarily storing the image quality of the CRT display screen stored in advance by one operation of a user switch. The control electrode voltage and / or the cathode voltage are adjusted according to the image quality adjustment data, and when the CRT display screen displays a moving image, the state of the CRT display screen is set to the "brightness priority" best state. The image quality adjustment data is controlled to increase the screen brightness to adjust to "brightness priority", and when the display returns to the original still image display, the CRT display screen is in the "focus priority" best condition. The screen focus is prioritized and adjusted by the image quality adjustment data To simplify the operations required for the adjustment for a CRT display screen of the focus and brightness of image quality when the switching of the display screen and the video display screen.

In the image quality adjusting method of the CRT display screen according to the invention of claim 4, the control electrode voltage and the cathode voltage are set according to the image quality adjusting value for the CRT display screen set by operating the variable resistor opened to the user. Either or both of them are adjusted to increase the brightness of the CRT display screen switched from the still image to the moving image, and the CRT display is switched from the still image to the moving image.
The adjustment for making up for the lack of brightness of the screen when the RT display screen is switched and for returning to the original screen state of “focus priority” when the screen is switched to the still image display again is facilitated.

In the image quality adjusting method for the CRT display screen according to the invention of claim 5, the image quality adjusting values corresponding to "focus priority" and "brightness priority" are preset in analog for the image quality of the CRT display screen. The image quality adjustment value that has been set is selected by operating a user switch, and the control electrode voltage and the cathode voltage are adjusted according to the selected image quality adjustment value.
When the display screen displays a moving image, the CRT is used.
Control the display screen state to the best state when brightness is prioritized. Adjust the screen brightness to "brightness priority" by the image quality adjustment value and adjust the CRT when returning to the original still image display. Controls the display screen state to the best state when "focus priority" is set by adjusting the image focus by the image quality adjustment value, and adjusts the screen focus when switching between the still image display screen and the moving image display screen. The operation required for adjusting the image quality of brightness is simplified.

In the image quality adjusting method of the CRT display screen according to the invention of claim 6, the image quality adjusting data of the CRT display screen stored by operating the user switch is read out, and the control electrode voltage and the control electrode voltage are read by the read image quality adjusting data. A screen for performing a still image display and a moving image display by adjusting the cathode voltage and the screen voltage to increase the brightness of the CRT display screen switched from the still image to the moving image display to compensate for the lack of screen brightness. Make it easy to adjust the condition.

In the image quality adjusting method for a CRT display screen according to a seventh aspect of the present invention, a user switch is operated to read image quality adjustment data which is stored in advance and gives priority to the focus of the CRT display screen, and control is performed by the read image quality adjustment data. The electrode voltage, the cathode voltage, and the screen voltage are set to adjust the focus-priority screen state when displaying a still image, and when displaying a moving image, the image quality adjustment data to be read is changed by the user switch, and the screen is changed. The brightness of the screen is increased to compensate for the lack of screen brightness, making it easier to adjust the screen state when giving priority to focus and when giving priority to brightness.

In the image quality adjusting method of the CRT display screen according to the invention of claim 8, the user switch is operated only once to read the image quality adjustment data which is stored in advance and controls the image quality of the CRT display screen to the optimum state, and The control electrode voltage and / or the cathode voltage and / or the screen voltage are adjusted according to the read image quality adjustment data, and the user switch is pressed once for the CRT display screen switched from a still image to a moving image. The CRT display screen state selected by the operation is controlled to the best state when the brightness is prioritized. The image brightness adjustment data is used to raise the screen brightness to adjust to "brightness priority" and display the original still image. When the display returns to, the state of the CRT display screen is changed by pressing the user switch once. The focus of the screen is prioritized and readjusted by the image quality adjustment data that controls the best state when the focus is prioritized, and the focus and brightness of the screen when switching between the still image display screen and the video display screen are adjusted. The operation required for adjusting the image quality is simplified.

In the image quality adjusting method of the CRT display screen according to the invention of claim 9, the image quality adjusting values corresponding to "focus priority" and "brightness priority" are preset in analog for the image quality of the CRT display screen. , Select the image quality adjustment value that has been set by operating the user switch, and adjust the control electrode voltage, cathode voltage and screen voltage according to the selected image quality adjustment value,
When the CRT display screen displays a moving image, the brightness of the screen is increased and adjusted by the image quality adjustment value that is controlled to "brightness priority" selected by the user switch, and when returning to the display of the original still image, " The focus of the screen is prioritized and adjusted by the image quality adjustment value that is controlled to "focus priority", and the operation required for adjusting the image quality of the focus and brightness of the still image display screen and the moving image display screen is simplified.

In the image quality adjusting method for the CRT display screen according to the tenth aspect of the present invention, the control electrode voltage and the cathode voltage are set according to the image quality adjusting value for the CRT display screen set by operating the variable resistor opened to the user. And / or the screen voltage is adjusted to increase the brightness of the CRT display screen switched from a still image to a moving image, and the screen brightness when the CRT display screen is switched from a still image to a moving image display. This makes it easy to readjust the original screen state in which priority is given to the focus when the display is switched to the still image display again.

According to the image quality adjusting method of the CRT display screen in the invention of claim 11, from the relationship between the screen voltage, the control electrode voltage and the cathode voltage in the "focus priority" or "brightness priority" of the CRT display, The cut-off characteristic of the CRT display is specified and stored in advance, and "focus priority" or "brightness priority" is set based on the operation of the user switch.
The image quality adjustment data at the time of is read from the stored cutoff characteristic, the control electrode voltage, the cathode voltage, and the screen voltage are adjusted by the read image quality adjustment data, and when the image is a still image, priority is given to focus, In the case of a moving image, the brightness of the screen is increased and the CRT display screen is adjusted to "brightness priority" to simplify the operations required for adjusting the image quality of the focus and brightness of the still image display screen and the moving image display screen, A continuous and flexible adjustment and an accurate adjustment according to the cutoff characteristic are realized.

According to a twelfth aspect of the invention, in the image quality adjusting method for the CRT display screen, the load resistance value of the main amplifying circuit for amplifying the video signal is adjusted by operating the user switch to change the amplification degree of the main amplifying circuit. By increasing the level of the video signal supplied to the cathode electrode as a whole and raising the brightness as compared with the case of the still image, the brightness of the CRT display screen switched from the still image display to the moving image display is increased.

According to a thirteenth aspect of the present invention, in the image quality adjusting circuit device for a CRT display screen, the DC bias applied to the cathode electrode for making the screen focus the best state, the control electrode voltage and the screen voltage are stored in advance in the storage means. In advance, the stored DC bias value and the control electrode voltage and the screen voltage are respectively selected by a user switch,
The selected DC bias value is supplied to the cut-off control circuit, the control electrode voltage is supplied to the control electrode voltage generation circuit, and the screen voltage is supplied to the screen voltage generation circuit. The lack of brightness of the switched CRT display screen is compensated, and the original screen state when the screen is switched to the still image display is restored by performing the reverse operation by the user switch, thereby giving priority to "focus". Returns to the screen state and facilitates adjustment of the CRT display screen in displaying a still image and a moving image.

According to a fourteenth aspect of the present invention, in the image quality adjusting circuit device for a CRT display screen, each value of the DC bias and control electrode voltage and the screen voltage applied to the cathode electrode for making the focus the best state, and the CRT display screen image are displayed. The DC bias applied to the cathode electrode for maximizing the brightness and the respective values of the control electrode voltage and the screen voltage are stored in the storage means, and the focus is brought to the best state by one operation of the user switch. DC bias and each value of the control electrode voltage and the screen voltage or each value of the DC bias and the control electrode voltage and the screen voltage that optimize the brightness of the CRT display screen are selected, and a still image or a moving image is displayed. indicate To facilitate the adjustment of the CRT display screen in a state.

According to a fifteenth aspect of the present invention, in the image quality adjusting circuit device for the CRT display screen, the DC voltage applied to the cathode electrode for bringing the focus of the CRT display screen into the best state by the resistance value of the variable resistor opened to the user. The bias and control electrode voltage and the screen voltage are set, and the DC bias applied to the cathode electrode for optimizing the brightness of the CRT display screen and the respective values of the control electrode voltage and the screen voltage are set. Alternatively, it is possible to continuously adjust the “focus priority” and “brightness priority” on the CRT display screen when displaying a moving image.

According to a sixteenth aspect of the present invention, in the image quality adjusting circuit device for the CRT display screen, the DC bias and control applied to the cathode electrode for making the focus of the CRT display screen the best state by the resistance value of the focus priority variable resistor. Electrode voltage and screen voltage are set, and DC bias and control electrode voltage and screen voltage applied to the cathode electrode for optimizing the brightness of the CRT display screen by the resistance value of the brightness priority variable resistor. A still image or video is displayed by setting a value and switching the focus priority variable resistor and brightness priority variable resistor with a user switch according to "focus priority" or "brightness priority". Adjustment of CRT display screen The ease.

According to a seventeenth aspect of the present invention, there is provided the image quality adjusting circuit device for a CRT display screen, the CR being stored in advance.
From the cut-off characteristics that define the relationship between the screen voltage, the control electrode voltage, and the cathode voltage for the T display, "focus priority" and "brightness priority" are selected.
The image quality adjustment data required to control the screen voltage, the control electrode voltage, and the cathode voltage at the time is read according to the cutoff characteristic of the operation of the user switch, and the cathode voltage is read based on the read image quality adjustment data. And adjusting the control electrode voltage and the screen voltage to facilitate the adjustment of the CRT display screen when displaying a still image or a moving image, and to perform continuous adjustment and accurate adjustment according to the cutoff characteristic. I do.

In the image quality adjusting circuit device for a CRT display screen according to the eighteenth aspect of the present invention, the load resistance value of the main amplifying circuit for amplifying the video signal is adjusted by operating the user switch to adjust the amplification degree of the main amplifying circuit. Instead, when the CRT display displays a moving image, the level of the video signal supplied to the cathode electrode is raised to raise the brightness of the CRT display screen.

[0046]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. 1 is an electric circuit diagram showing a configuration of a CRT drive circuit including an image quality adjusting circuit device for a CRT display screen according to a first embodiment of the present invention. In FIG. 1, parts that are the same as or correspond to those in FIG. 8 are given the same reference numerals and description thereof is omitted. In the figure, the contrast / bright adjustment circuit 10 is provided with only the contrast volume 10a, and is not provided with a bright volume. Reference numeral 11 denotes a screen voltage adjustment user switch opened to the user for adjusting the screen voltage,
11a is an up key and 11b is a down key. 12
Is a user switch for adjusting the G1 voltage, which is open to the user for adjusting the G1 voltage, and 12a is an up key,
12b is a down key. Reference numeral 13 is a user switch for adjusting the cathode voltage, which is open to the user for adjusting the cathode voltage, 13a is an up key, 13b is a down key, which are stored in the memory (storage means) 15 in advance by these user switches. Select the screen voltage, G1 voltage, and cathode voltage.

Reference numeral 14a is a microcomputer (reading means), and 14b is a memory 1 of the microcomputer 14a.
5 is a D / A converter (voltage supply means) for D / A converting the screen voltage read from the reference numeral 5, and 14c is a D for A / D converting the G1 voltage read from the memory 15 of the microcomputer 14a. Similarly, a / A converter (voltage supply means) 14d is a D / A converter (voltage supply means) for D / A converting the cathode voltage read from the memory 15. 14 is a screen voltage, G1 which is an image quality adjusting circuit device of the CRT display screen.
A voltage control unit that controls the voltage and the cathode voltage, and includes a microcomputer 14a and D / A converters 14b, 1
4c, 14d and the like.

Next, the operation will be described. In the image quality adjustment circuit device of the CRT display screen of the CRT drive circuit, the brightness adjustment of the CRT display screen is variably controlled by the microcomputer 14a. That is, the screen voltage, the G1 voltage, and the cathode voltage that cause the focus of the CRT display screen to be in the best state are stored in advance in the memory 15 of the microcomputer 14a. Normally, the microcomputer 14a adjusts the screen voltage. Key 11 of the user switch 11 for
a or down key 11b, up key 12a or down key 12 of the G1 voltage adjustment user switch 12
b, the operation input of the up key 13a or the down key 13b of the cathode voltage adjusting user switch 13 is received. Then, the screen voltage, the G1 voltage and the cathode voltage stored in the memory 15 are read out in accordance with the operation input and converted into analog voltage values by the D / A converters 14b, 14c and 14d, and the screen voltage is generated by the screen voltage generating circuit. 5 is supplied to the non-inverting input terminal of the operational amplifier 5a, the G1 voltage is supplied to the base of the transistor TR2 of the G1 voltage generation circuit (control electrode voltage generation circuit) 9, and the cathode voltage is supplied to the transistor TR1 of the cutoff control circuit 3. To do.

As a result, the screen electrode, the G1 electrode, and the cathode electrode of the CRT display are supplied with the screen voltage, the G1 voltage, and the cathode voltage so that the focus of the CRT display screen is in the best state, and the CRT is displayed.
Maintains the best focus on the display screen.

The operation described above is based on the premise that the CRT display mainly displays a still image.
When a moving image is displayed on the CRT display adjusted in this way, the brightness of the screen becomes insufficient. The screen of a television set that is commonly used is the one of a display monitor used as a display device of a personal computer.
The brightness is adjusted to 3 times. Therefore, when displaying a moving image, the brightness of the screen is adjusted to a screen state with priority. Hereinafter, adjustment that prioritizes screen brightness when displaying a moving image will be described.

Generally, as is clear from the cathode modulation characteristic of FIG. 2, the smaller the voltage difference Ek between the G1 electrode and the cathode electrode is, the larger the same cathode modulation voltage (amplitude of the amplified video signal) is. Anode current flows to the CRT
The display screen becomes bright. Therefore, the video is
When it is necessary to raise the brightness level when displaying on the display screen, the G1 voltage data read from the memory 15 of the microcomputer 14a is changed by the G1 voltage adjusting user switch 12, and a higher value of G1 is set.
The voltage is read, and the cathode voltage data read from the memory 15 of the microcomputer 14a is changed by the cathode voltage adjusting user switch 13,
A lower value of the cathode voltage is read out to reduce the potential difference Ek between the G1 voltage and the cathode voltage.

At this time, as is clear from the cutoff characteristic of FIG. 3, since the CRT spot cutoff changes, the screen voltage adjustment user switch 11 changes the screen voltage data read from the memory 15 to a higher screen voltage. Then adjust to the optimum spot cutoff. As a result, the brightness can be increased and the CRT display screen can be brightened while maintaining the optimum spot cutoff state.

The CRT display screen is displayed again.
When setting the focus priority state when displaying a still image, the user switches are operated so as to restore the G1 voltage data, the cathode voltage data, and the screen voltage data changed by the user switches. It suffices to read the voltage data. For this purpose, the operation opposite to the reading operation of the higher G1 voltage performed when displaying the moving image is performed on the G1 voltage adjusting user switch 12, and the reading of the lower cathode voltage is performed. An operation opposite to the operation is performed on the cathode voltage adjustment user switch 13, and an operation opposite to the operation of reading a higher screen voltage is performed on the screen voltage adjustment user switch 11.

Example 2. Further, the screen voltage adjusting user switch 11 and the G1 voltage adjusting user switch 1
2. The screen voltage, the G1 voltage, and the cathode voltage are adjusted by the user switch 13 for adjusting the cathode voltage by previously storing the screen voltage data, the G1 voltage data, and the cathode voltage data in the “focus priority” and the “brightness priority”. 15 and read out by one operation of the user switch according to “focus priority” or “brightness priority”, and the optimum screen voltage and G1 voltage according to “focus priority” or “brightness priority” ，
The cathode voltage may be adjusted.

Example 3. In addition, the configuration of the voltage control unit 14 of the first embodiment includes the screen voltage adjusting variable resistor, the G1 voltage adjusting variable resistor, which is open to the user for adjusting the screen voltage, the G1 voltage, and the cathode voltage. Optimum screen voltage and G1 voltage according to "focus priority" or "brightness priority" when displaying still images or moving images by operating each of these variable resistors for cathode voltage adjustment. The cathode voltage may be adjusted.

Example 4. Fourth Embodiment FIG. 4 is an electric circuit diagram showing a configuration of a CRT drive circuit including an image quality adjusting circuit device for a CRT display screen according to a fourth embodiment of the present invention. In FIG. 4, parts that are the same as or equivalent to those in FIG. In the figure, G1
The voltage generation circuit 9 includes a brightness priority auxiliary resistor 9 for setting a G1 voltage between the variable resistor (focus priority variable resistor) 9a and the ground when "brightness priority" is set.
b is inserted in series, and an opening / closing contact 9c for short-circuiting the brightness priority auxiliary variable resistor 9b is provided. Furthermore, the contrast / bright adjustment circuit 1
At 0, a brightness priority auxiliary variable resistor 10c for setting the cathode voltage in the case of "brightness priority" is inserted in series between the bright volume (focus priority variable resistor) 10b and the ground. And a switching contact 10d for short-circuiting the brightness-priority auxiliary variable resistor 10c.
Is provided.

Reference numeral 16 denotes a voltage switching unit, which has a resistor circuit (focus variable resistor) 16a and a resistor circuit (brightness variable) in which the screen voltages in the "focus priority" and "brightness priority" are preset as resistance values. Changeover switch 16b for controlling the brightness variable auxiliary variable resistor 9b of the G1 voltage generating circuit 9 by operating the priority variable resistor 16b) and the user switch 17 opened to the user. A changeover switch circuit 16d for controlling the circuit 16c and the opening / closing contact 10d for short-circuiting the brightness priority auxiliary variable resistor 10c of the contrast / bright adjustment circuit 10 by operating the user switch 17.
By operating the user switch 17, the resistance circuit 16
and a changeover switch circuit 16e for switching the screen voltage in the "focus priority" and the "brightness priority" which are set as the resistance values in a and 16b.

Next, the operation will be described. In the fourth embodiment, the brightness adjustment when the CRT display screen is switched from the still image display to the moving image display is performed by the screen voltage generation circuit 5, the G1 voltage generation circuit 9, the contrast
By switching the screen voltage, the G1 voltage, and the cathode voltage, which are preset as analog values in advance in the brightness adjustment circuit 10 in accordance with “focus priority” and “brightness priority”, by one operation of the user switch 17. To do.

That is, when the CRT display screen displays a still image, by closing the user switch 17, the changeover switch circuit 16c closes the open / close contact 9c of the G1 voltage generating circuit 9 and the brightness priority auxiliary variable resistor. Bowl 9b
, The changeover switch circuit 16d closes the open / close contact 10d of the contrast / bright adjustment circuit 10 to short-circuit the brightness priority auxiliary variable resistor 10c, and the changeover switch circuit 16e changes the resistance value in the resistance circuit 16a. Since the screen voltage for the "focus priority" that has been set is selected, the CRT display screen that displays a still image according to the screen voltage, G1 voltage, and cathode voltage that are set to the focus priority state displays "focus priority". Is adjusted.

When the CRT display screen displays a moving image, the user switch 17 is operated to open it.
As a result, the changeover switch circuit 16c opens the opening / closing contact 9c of the G1 voltage generating circuit 9 and the brightness-priority auxiliary variable resistor 9
By inserting b between the variable resistor 9a and the ground, the voltage level supplied to the base of the transistor TR2 is raised to the plus side, and the collector terminal voltage of the transistor TR2 is shifted to the plus side. The changeover switch circuit 16
d is a switching contact 1 of the contrast / bright adjustment circuit 10.
0d is opened and the brightness priority auxiliary variable resistor 10c is inserted between the bright volume 10b and the ground to raise the voltage level supplied to the base of the transistor Tr1 and lower the cathode voltage. Further, the changeover switch circuit 16e selects the screen voltage in the "brightness priority" set as the resistance value in the resistance circuit 16a. As a result, the difference between the cathode voltage and the G1 voltage becomes small and CR
The brightness of the T display screen increases, and the CRT display screen displaying a moving image is adjusted to the optimum state of "brightness priority" by the screen voltage set according to the difference at this time.

Embodiment 5 FIG. FIG. 5 is an electric circuit diagram showing a configuration of a CRT drive circuit provided with an image quality adjusting circuit device for a CRT display screen in Embodiment 5 of the present invention. In FIG. 5, parts that are the same as or correspond to those in FIG. 8 are given the same reference numerals and description thereof is omitted. In the figure, 18
Is a microcomputer (image quality adjustment data reading means)
A cut-off characteristic of each CRT display is written as data to the CRT drive circuit of the CRT display, for example, at the time of factory shipment. A user switch 19 includes an up key 19a and a down key 19b.

Next, the operation will be described. In this embodiment, by operating the up key 19a or the down key 19b, the screen voltage, the G1 voltage, and the cathode voltage on the cutoff characteristic corresponding to the CRT display are stepped up or down.

Generally, as shown in the cut-off characteristic of FIG. 6, a CRT is an individual CRT even if it is of the same type.
The cut-off characteristics are different for each. In FIG.
Cutoff voltage (8) (G1 voltage and cathode voltage) of the CRT in the screen voltage (4) in the "focus priority" and cutoff voltage of any CRT in the screen voltage (3) in the "brightness priority" ( Each data necessary for controlling 7) is stored in the memory 18. In this case, for example, when the cutoff characteristic of the CRT display is as shown in (9) of FIG. 6, the up switch 19a or the down key 19b of the user switch 19 is operated to perform an up step or Screen voltage, G1 voltage, cathode voltage are stored in memory 1 after down-step
8 is read out, and each electrode voltage of the CRT is adjusted.

Example 6. FIG. 7 is an electric circuit diagram showing a configuration of a CRT drive circuit including an image quality adjusting circuit device for a CRT display screen in Embodiment 6 of the present invention. In FIG. 7, parts that are the same as or correspond to those in FIG. 8 are given the same reference numerals and description thereof is omitted. In the figure, 20
Is a user switch (adjusting means), 2a is a load resistance of the video main amplifier 2, and 2b is a load resistance for amplification degree adjustment of the video main amplifier 2 which is connected in parallel to the load resistance 2a when the user switch 20 is closed. 2c are resistors connected between the emitter terminal of the transistor TR3 and the ground.

Next, the operation will be described. When displaying a still image on a personal computer or the like, the user switch 20 is closed to reduce the load resistance value of the video main amplifier 2. At this time, the amplification factor of the video main amplifier 2 is determined by the combined resistance value of the resistor 2c connected between the emitter of the transistor TR3 and the ground and the combined resistance value of the load resistor 2a and the amplification factor adjusting load resistor 2b connected in parallel. Since the value is determined by the value / value of the resistor 2c, the amplification degree of the video main amplifier 2 becomes small.

On the other hand, when displaying a moving image, the user switch 20 is opened to increase the load resistance value of the video main amplifier 2. As a result, the amplification degree of the video main amplifier 2 is increased, and the brightness of the CRT display screen is increased.

[0067]

As described above, according to the first aspect of the invention, the image quality adjustment data of the CRT display screen stored in advance is read based on the operation of the user switch, and the control electrode voltage and the control electrode voltage are read according to the read image quality adjustment data. The cathode voltage is adjusted so that the brightness of the CRT display screen switched from a still image to a moving image is increased to adjust to "brightness priority", so when the display screen is switched from a still image to a moving image. There is an effect that the image quality adjusting method of the CRT display screen that can easily adjust the lack of brightness of the CRT display screen is obtained.

According to the second aspect of the present invention, the image quality adjustment data which prioritizes the focus of the CRT display screen stored in advance based on the operation of the user switch is read, and the control electrode voltage and the cathode voltage are read according to the read image quality adjustment data. Is set, the focus is prioritized for a still image, and the read and set focus is prioritized for a moving image. The image quality adjustment data is changed by the user switch to increase the screen brightness to “brightness priority”. Since the CRT display screen is configured to be adjusted to, it is possible to easily perform focus priority screen adjustment when displaying a still image and brightness priority screen adjustment when displaying a moving image, and again, Screen to return to the original state of "focus priority" when returning to the screen showing a still image The effect of the image quality adjustment method of the CRT display screen capable of an integer easily obtained.

According to the third aspect of the present invention, the image quality adjustment data for controlling the image quality of the CRT display screen stored in advance by one operation of the user switch is read out, and the read image quality adjustment data is used for the control. "Brightness priority" is achieved by adjusting the electrode voltage and / or the cathode voltage to increase the brightness of the CRT display screen switched from a still image to a moving image.
The image quality adjustment method of the CRT display screen can be obtained in which the lack of brightness when the screen is switched from a still image to a moving image can be easily adjusted by the user's operation.

According to the invention of claim 4, the image quality adjustment value of the CRT display screen is set based on the operation of the variable resistor opened to the user, and the control electrode voltage and the cathode voltage are set according to the set image quality adjustment value. By adjusting both and / or one of the two, and increasing the brightness of the CRT display screen that has switched from a still image to a moving image to adjust to “brightness priority”, the screen switches from a still image to a moving image. There is an effect that an image quality adjusting method for a CRT display screen can be obtained in which the lack of brightness in the case of lighting can be easily and continuously adjusted by a user operation.

According to the fifth aspect of the present invention, the image quality adjustment value which is preset analogically in accordance with "focus priority" and "brightness priority" for the image quality of the CRT display screen is selected by operating the user switch. Then, the control electrode voltage and the cathode voltage are adjusted according to the selected image quality adjustment value, and the brightness of the CRT display screen switched from the still image to the moving image is increased to adjust to “brightness priority”. There is an effect that the image quality adjustment method of the CRT display screen can be obtained which can easily and reliably perform the focus priority screen adjustment when displaying a still image and the brightness priority screen adjustment when displaying a moving image.

According to the sixth aspect of the invention, the image quality adjustment data of the CRT display screen stored in advance based on the operation of the user switch is read out, and the control electrode voltage and the DC bias applied to the cathode electrode are read out according to the read out image quality adjustment data. And the screen voltage are adjusted so that the focus is prioritized in the case of a still image, and the brightness of the screen is increased in the case of a moving image to adjust the CRT display screen to "brightness priority". , There is an effect that the image quality adjustment method of the CRT display screen can be obtained which can easily perform the “focus priority” screen adjustment when displaying a still image and the “brightness priority” screen adjustment when displaying a moving image. .

According to the invention of claim 7, when the image quality adjustment data regarding the control electrode voltage, the cathode voltage, and the screen voltage which prioritize the focus of the CRT display screen stored in advance are read and set, the user switch is used. By doing so, the brightness of the screen when displaying a moving image is increased and the CRT is set to "brightness priority".
Since it is configured to adjust the display screen, it is possible to easily perform the "focus priority" screen adjustment when displaying a still image and the "brightness priority" screen adjustment when displaying a moving image. There is an effect that the image quality adjusting method of the CRT display screen can be obtained which facilitates the screen adjustment for returning to the original state when the screen showing the still image is displayed.

According to the invention of claim 8, the image quality adjustment data for controlling the image quality of the CRT display screen which is stored in advance by one operation of the user switch is read, and the read image quality adjustment data is used for the control. CRT display with "brightness priority" by changing the electrode voltage and / or DC bias applied to the cathode electrode and / or the screen voltage to give priority to focus in the case of still images and raise the screen brightness in the case of moving images Since it is configured to adjust the screen, it is possible to easily and reliably perform the "focus priority" screen adjustment when displaying a still image and the "brightness priority" screen adjustment when displaying a moving image. There is an effect that a method of adjusting the image quality of the screen can be obtained.

According to the invention of claim 9, the image quality of the CRT display screen is preset in analog according to "focus priority" which gives priority to focus and "brightness priority" which gives priority to screen brightness. The image quality adjustment values for the control electrode voltage, the DC bias applied to the cathode electrode, and the screen voltage are selected by operating the user switch, and the screen is adjusted for brightness and brightness when displaying still images and moving images. Therefore, there is an effect that an image quality adjusting method of the CRT display screen can be obtained which can easily and quickly adjust the CRT display screen according to the display of a still image or the display of a moving image.

According to the tenth aspect of the invention, the image quality adjustment value of the CRT display screen is set based on the operation of the variable resistor opened to the user, and the control electrode voltage and the cathode electrode are set according to the set image quality adjustment value. Adjusting the CRT display screen to "brightness priority" by adjusting the DC voltage and / or the DC voltage applied to the screen and the screen voltage to give priority to the focus in the case of a still image and increase the screen brightness in the case of a moving image. The CRT display screen can be easily adjusted for still images and moving images, and the lack of brightness of the CRT display screen for moving images can be easily and continuously adjusted. There is an effect that the image quality adjusting method of the CRT display screen can be obtained.

According to the eleventh aspect of the present invention, the screen voltage, the control electrode voltage, and the cathode voltage at the time of "focus priority" stored for the CRT display are controlled based on the cutoff characteristic for each CRT display. Image quality adjustment data necessary for controlling the screen voltage, the control electrode voltage and the cathode voltage when "brightness priority" is read by operating the user switch,
Since the CRT display screen is adjusted according to when displaying a still image or moving image, the screen adjustment that prioritizes the focus when displaying a still image and the brightness when displaying a moving image are performed. It is possible to obtain an image quality adjusting method for a CRT display screen, which is capable of continuously and accurately performing the screen adjustment with priority.

According to the twelfth aspect of the invention, the load resistance value of the main amplifier circuit for amplifying the video signal is adjusted based on the operation of the user switch, and the amplification degree of the main amplifier circuit is displayed as a still image. The image quality adjustment method for the CRT display screen allows the adjustment of the CRT display screen according to the time of displaying a still image or the time of displaying a moving image, because it is configured to be variable according to the time of displaying a moving image. There is an effect that can be obtained.

According to the thirteenth aspect of the present invention, the DC bias value and the control electrode voltage and the screen voltage which make the focus stored in the storage means the best state, and the DC bias value, the control electrode voltage and the screen voltage are set. Based on the brightness, the DC bias value, the control electrode voltage, and the screen voltage when prioritizing the brightness are selected by user switches, respectively, and the CRT display screen is adjusted when displaying a still image or a moving image. Since it is configured as described above, there is an effect that an image quality adjusting circuit device for a CRT display screen that can easily adjust the CRT display screen for displaying a still image or a moving image is obtained.

According to the fourteenth aspect of the present invention, the DC bias applied to the cathode electrode and the respective values of the control electrode voltage and the screen voltage for making the focus of the CRT display screen the best state and the brightness of the CRT display screen. The DC bias applied to the cathode electrode and the respective values of the control electrode voltage and the screen voltage in order to optimize Since each value of the screen voltage is configured to be selected and read by one operation of the user switch when displaying a still image or a moving image, the CRT display screen for displaying the still image or the moving image is displayed. The operation required for adjustment can be simplified. The effect of the image quality adjustment circuit device of the RT display screen is obtained.

According to the fifteenth aspect of the present invention, the DC bias and the control electrode voltage applied to the cathode electrode for achieving the best focus or screen brightness depending on the time of displaying a still image and the time of displaying a moving image. Since it is configured to have a variable resistor open to the user for setting the screen voltage and the screen voltage, the “focus priority” CRT display screen adjustment when displaying a still image and the “brightness priority” when displaying a moving image. There is an effect that an image quality adjusting circuit device for a CRT display screen that facilitates the adjustment of the CRT display screen is obtained.

According to the sixteenth aspect of the present invention, the DC bias applied to the cathode electrode and the control electrode voltage and the screen voltage for making the focus the best state are set by the focus priority variable resistor, and the brightness is set. The DC bias applied to the cathode electrode and the control electrode voltage and the screen voltage for maximizing the brightness of the CRT display screen are set by the priority variable resistor, and the focus priority variable resistor of the focus priority variable resistor is set by the user switch. Since the set value and the set value of the brightness priority variable resistor are configured to be switched according to "focus priority" or "brightness priority", a CRT according to "focus priority" or "brightness priority" Easy and reliable adjustment of the display screen The effect of the image quality adjustment circuit device of the RT display screen is obtained.

According to the seventeenth aspect of the invention, the image quality adjustment data in the case of "focus priority" or the image quality adjustment in the case of "brightness priority" according to the cutoff characteristic of the CRT display stored in the storage means. Since the data is read out according to the cutoff characteristic based on the operation of the user switch and the focus and brightness of the screen when displaying a still image or a moving image are adjusted, the CRT is used.
There is an effect that an image quality adjusting circuit device for a CRT display screen can be obtained which can easily perform accurate screen adjustment for each display.

According to the eighteenth aspect of the invention, since the adjusting means for adjusting the load resistance value of the main amplifying circuit for amplifying the video signal based on the operation of the user switch is provided, it is possible to operate the user switch. An image quality adjusting circuit device for a CRT display screen, which can easily increase the amplification degree of the main amplifier circuit when displaying a moving image and easily adjust the lack of brightness of the CRT display screen when displaying a moving image. It is effective.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing a configuration of a CRT drive circuit including an image quality adjustment circuit device for a CRT display screen according to a first embodiment of the present invention.

FIG. 2 is a cathode modulation characteristic diagram of the CRT display according to the first embodiment of the present invention.

FIG. 3 is a characteristic diagram showing a spot cutoff minimum limit and a spot cutoff maximum limit of the CRT display in Embodiment 1 of the present invention.

FIG. 4 is an electric circuit diagram showing a configuration of a CRT drive circuit including an image quality adjusting circuit device for a CRT display screen according to a fourth embodiment of the present invention.

FIG. 5 is an electric circuit diagram showing a configuration of a CRT drive circuit provided with an image quality adjustment circuit device for a CRT display screen in Embodiment 5 of the present invention.

FIG. 6 is a characteristic diagram showing a spot cutoff minimum limit and a spot cutoff maximum limit of a CRT display in Embodiment 5 of the present invention.

FIG. 7 is an electric circuit diagram showing a configuration of a CRT drive circuit including an image quality adjustment circuit device for a CRT display screen according to a sixth embodiment of the present invention.

FIG. 8 is an electric circuit diagram showing a configuration of a CRT drive circuit including a conventional image quality adjusting circuit device for a CRT display screen.

[Explanation of reference numerals] 3 cut-off control circuit, 5 screen voltage generation circuit, 9 G1 voltage generation circuit (control electrode voltage generation circuit), 9a variable resistor (variable resistor for focus priority), 10b bright volume (for focus priority) Variable resistor), 9b, 10c auxiliary variable resistor for brightness priority, 14a microcomputer (reading means),
14b, 14c, 14d D / A converter (voltage supply means), 14e microcomputer (image quality adjustment data reading means), 16a resistance circuit (focus priority variable resistor), 16b resistance circuit (brightness priority variable resistor) , 15, 18 memory (storage means), 17, 19
User switch, 20 user switch (adjusting means).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Daigo Yamaguchi Sanyo Denki Engineering Co., Ltd. 2-6-2 Otemachi, Chiyoda-ku, Tokyo

Claims (18)

[Claims] 1. A method for adjusting the image quality of a CRT display screen, wherein the image quality of the CRT display screen is adjusted by a control electrode voltage, a DC bias applied to the cathode electrode and the screen voltage of the screen electrode based on an operation from the outside. Based on the operation, the image quality adjustment data of the CRT display screen stored in advance is read out, and the read out image quality adjustment data is used to adjust the control electrode voltage of the control electrode and the cathode voltage which is a direct current bias applied to the cathode electrode to stop the operation. A method for adjusting the image quality of a CRT display screen, characterized by increasing the brightness of the CRT display screen switched from an image to a moving image and adjusting the brightness to "brightness priority". 2. An image quality adjusting method for a CRT display screen, which adjusts the image quality of the CRT display screen by a control electrode voltage, a DC bias applied to the cathode electrode and a screen voltage of the screen electrode based on an operation from the outside. Based on the operation, the image quality adjustment data that prioritizes the focus of the CRT display screen is stored in advance and the control electrode voltage of the control electrode and the cathode voltage that is a DC bias applied to the cathode electrode are read according to the read image quality adjustment data. The image quality adjustment data which is set and gives priority to the focus in the case of a still image and the priority set to read and set in the case of a moving image is changed by the user switch to increase the screen brightness to the "brightness priority". CRT display (A) A method for adjusting the image quality of a CRT display screen, which comprises adjusting the screen. 3. A method for adjusting the image quality of a CRT display screen, wherein the image quality of the CRT display screen is adjusted by a control electrode voltage, a DC bias applied to the cathode electrode, and the screen voltage of the screen electrode based on an external operation. The image quality adjustment data for controlling the image quality of the CRT display screen stored in advance based on one operation is read out, and the control electrode voltage of the control electrode and the DC bias applied to the cathode electrode are read out by the read image quality adjustment data. The above-mentioned C which is set by adjusting both or either of the cathode voltage which is
A method for adjusting the image quality of a CRT display screen, which comprises increasing the brightness of the RT display screen to adjust to "brightness priority". 4. An image quality adjusting method for a CRT display screen, which adjusts the image quality of the CRT display screen based on an operation from the outside by a control electrode voltage, a DC bias applied to the cathode electrode, and a screen voltage of the screen electrode. Based on the operation of the variable resistor, set the image quality adjustment value of the CRT display screen,
According to the set image quality adjustment value, both or either one of the control electrode voltage of the control electrode and the cathode voltage which is a DC bias applied to the cathode electrode is adjusted, and the C image is switched from a still image to a moving image.
A method for adjusting the image quality of a CRT display screen, which comprises increasing the brightness of the RT display screen to adjust to "brightness priority". 5. An image quality adjusting method for a CRT display screen, which adjusts the image quality of the CRT display screen by a control electrode voltage, a DC bias applied to the cathode electrode, and a screen voltage of the screen electrode based on an operation from the outside. Regarding the image quality of the screen, an image quality adjustment value preset in analog according to "focus priority" and "brightness priority" is selected by operating a user switch, and the control electrode voltage and cathode are selected according to the selected image quality adjustment value. Image quality of CRT display screen characterized by adjusting the cathode voltage, which is a DC bias applied to the electrodes, to raise the brightness of the CRT display screen switched from a still image to a moving image to "brightness priority" Adjustment method. 6. A method for adjusting the image quality of a CRT display screen, wherein the image quality of the CRT display screen is adjusted based on an external operation by a control electrode voltage, a DC bias applied to the cathode electrode, and a screen voltage of the screen electrode. Based on the operation, the image quality adjustment data of the CRT display screen stored in advance is read, and the control electrode voltage, the DC bias applied to the cathode electrode, and the screen voltage are adjusted by the read image quality adjustment data. A method for adjusting the image quality of a CRT display screen, characterized by adjusting the focus of the CRT display screen by raising the brightness of the screen to "brightness priority" in the case of a moving image. 7. An image quality adjusting method for a CRT display screen, which adjusts the image quality of the CRT display screen by a control electrode voltage, a DC bias applied to the cathode electrode and a screen voltage of the screen electrode based on an operation from the outside. Based on the operation, image quality adjustment data that prioritizes focus of the CRT display screen stored in advance is read, and the control electrode voltage of the control electrode, the DC bias applied to the cathode electrode, and the screen voltage are set by the read image quality adjustment data. Then, the priority is given to the focus when the image is a still image, and the image quality adjustment data which is read out and set is changed by the user switch when the image is a moving image, and the screen brightness is increased to adjust the CRT display screen to "brightness priority". What to do A method for adjusting the image quality of a CRT display screen characterized by: 8. An image quality adjusting method for a CRT display screen, which comprises adjusting the image quality of the CRT display screen by a control electrode voltage, a DC bias applied to the cathode electrode and a screen voltage of the screen electrode based on an operation from the outside. The image quality adjustment data for controlling the image quality of the CRT display screen stored in advance by one operation is read out, and the read image quality adjustment data is used to set the control electrode voltage of the control electrode and the DC bias applied to the cathode electrode. The screen voltage of both or either or both of the screen electrodes is adjusted and set, focus is prioritized in the case of a still image, and screen brightness is raised in the case of a moving image to set the CRT display screen to "brightness priority". Characterized by adjusting How to adjust the image quality of the CRT display screen. 9. An image quality adjusting method for a CRT display screen, which adjusts the image quality of the CRT display screen based on an external operation by a control electrode voltage, a DC bias applied to the cathode electrode and a screen voltage of the screen electrode. An image quality adjustment value that is preset in analog according to "focus priority" that prioritizes focus on screen image quality and "brightness priority" that prioritizes screen brightness is selected by operating a user switch, and The control electrode voltage of the control electrode, the DC bias applied to the cathode electrode, and the screen voltage of the screen electrode are adjusted according to the selected image quality adjustment value, priority is given to focus in the case of a still image, and brightness of the screen is adjusted in the case of a moving image. Raise it to "brightness priority" A method for adjusting the image quality of a CRT display screen, which comprises adjusting the T display screen. 10. A method for adjusting the image quality of a CRT display screen, which adjusts the image quality of the CRT display screen by a control electrode voltage, a DC bias applied to the cathode electrode, and the screen voltage of the screen electrode based on an operation from the outside. The image quality adjustment value of the CRT display screen is set based on the operation of the variable resistor, and the control electrode voltage of the control electrode and / or the DC bias applied to the cathode electrode are set according to the set image quality adjustment value. And a screen electrode for adjusting the screen voltage of the screen electrode so as to prioritize focus in the case of a still image and raise the screen brightness in the case of a moving image to adjust the CRT display screen to "brightness priority". Display screen image quality adjustment method. 11. A method for adjusting the image quality of a CRT display screen, wherein the image quality of the CRT display screen is adjusted by a control electrode voltage, a DC bias applied to the cathode electrode, and a screen voltage of the screen electrode based on an external operation. From the relationship between the screen voltage, the control electrode voltage, and the cathode voltage specified for the display, the screen voltage, the control electrode voltage, and the cathode voltage in the "focus priority" stored for the CRT display are controlled. Image quality adjustment data necessary for controlling the screen voltage, the control electrode voltage and the cathode voltage in the case of "brightness priority" are read out based on the operation of the user switch, Read Adjusting the control electrode voltage, the cathode voltage, and the screen voltage according to image quality adjustment data, prioritizing focus when a still image,
Further, in the case of a moving image, the image quality adjusting method of the CRT display screen is characterized in that the brightness of the screen is increased and the CRT display screen is adjusted to "brightness priority". 12. A method for adjusting the image quality of a CRT display screen, which comprises adjusting the image quality of the CRT display screen based on an external operation by a control electrode voltage, a DC bias applied to the cathode electrode, and a screen voltage of the screen electrode. A CRT display screen characterized by adjusting a load resistance value of a main amplification circuit for amplifying a video signal based on an operation, increasing brightness in a moving image as compared with that in a still image, and adjusting a CRT display screen. Image quality adjustment method. 13. A cutoff control circuit for generating a direct current component of a video signal and supplying it to a cathode electrode, a control electrode voltage generating circuit for generating a control electrode voltage of a control electrode of a CRT display, and a screen voltage of a screen electrode. An image quality adjustment circuit device for a CRT display screen for adjusting the cathode voltage, the control electrode voltage, and the screen voltage in a CRT drive circuit having a screen voltage generation circuit for generating, and adjusting the image quality of the CRT display screen. Storage means for storing in advance the DC bias applied to the cathode electrode and the control electrode voltage and the screen voltage for making the screen focus in the best state, and the DC bias value and the control stored in the storage means. For selecting the DC electrode bias voltage and the screen voltage, and the DC bias value and the control electrode voltage and the screen voltage when prioritizing the brightness based on the DC bias value and the control electrode voltage and the screen voltage, respectively. User switch, reading means for reading the DC bias value, the control electrode voltage and the screen voltage selected by the user switch, and the DC bias value, the control electrode voltage and the screen voltage read by the reading means An image quality adjustment circuit device for a CRT display screen, comprising: a cutoff control circuit, a voltage supply means for supplying the control electrode voltage generation circuit, and the screen voltage generation circuit. 14. A cutoff control circuit for generating a direct current component of a video signal and supplying it to a cathode electrode, a control electrode voltage generation circuit for generating a control electrode voltage of a control electrode of a CRT display, and a screen voltage for a screen electrode. An image quality adjustment circuit device for a CRT display screen for adjusting the cathode voltage, the control electrode voltage, and the screen voltage in a CRT drive circuit having a screen voltage generation circuit for generating, and adjusting the image quality of the CRT display screen. Focusing on focus, each value of the DC bias and the control electrode voltage and the screen voltage applied to the cathode electrode for making the focus the best state, and the brightness of the CRT display screen are prioritized, and the CRT display is prioritized. Display means for storing the DC bias applied to the cathode electrode and the respective values of the control electrode voltage and the screen voltage for making the brightness of the display screen the best, and the direct current for bringing the focus to the best state from the storage means. To select and read the bias and the values of the control electrode voltage and the screen voltage or the DC bias and the values of the control electrode voltage and the screen voltage that optimize the brightness of the CRT display screen by one operation. C user switch
Image quality adjustment circuit device for RT display screen. 15. A cutoff control circuit for generating a direct current component of a video signal and supplying it to a cathode electrode, a control electrode voltage generation circuit for generating a control electrode voltage of a control electrode of a CRT display, and a screen voltage of a screen electrode. An image quality adjustment circuit device for a CRT display screen for adjusting the cathode voltage, the control electrode voltage, and the screen voltage in a CRT drive circuit having a screen voltage generation circuit for generating, and adjusting the image quality of the CRT display screen. DC bias applied to the cathode electrode for the best focus, setting of the control electrode voltage and the screen voltage, and DC bias applied to the cathode electrode for optimizing the brightness of the CRT display screen. An image quality adjusting circuit device for a CRT display screen, comprising a variable resistor open to the user for setting the respective values of the astigmatism and the control electrode voltage and the screen voltage. 16. A cutoff control circuit for generating a direct current component of a video signal and supplying it to a cathode electrode, a control electrode voltage generation circuit for generating a control electrode voltage of a control electrode of a CRT display, and a screen voltage of a screen electrode. An image quality adjustment circuit device for a CRT display screen for adjusting the cathode voltage, the control electrode voltage, and the screen voltage in a CRT drive circuit having a screen voltage generation circuit for generating, and adjusting the image quality of the CRT display screen. A DC bias applied to the cathode electrode for achieving the best focus, a focus priority variable resistor for setting the control electrode voltage and the screen voltage, and the brightness of the CRT display screen are optimized. The brightness priority variable resistor for setting the DC bias applied to the cathode electrode for control, the control electrode voltage and the screen voltage, and the focus priority variable resistor and the brightness priority variable resistor are An image quality adjusting circuit device for a CRT display screen, comprising: a user switch that is switched according to "focus priority" or "brightness priority". 17. A cutoff control circuit for generating a direct current component of a video signal and supplying it to a cathode electrode, a control electrode voltage generation circuit for generating a control electrode voltage of a control electrode of a CRT display, and a screen voltage for a screen electrode. An image quality adjustment circuit device for a CRT display screen for adjusting the cathode voltage, the control electrode voltage, and the screen voltage in a CRT drive circuit having a screen voltage generation circuit for generating, and adjusting the image quality of the CRT display screen. For the CRT display, the screen voltage and the control electrode voltage obtained by previously specifying the relationship between the screen voltage, the control electrode voltage, and the cathode voltage when “focus priority” and “brightness priority” are specified. Storage means for storing the image quality adjustment data necessary for controlling the pressure and the cathode voltage, and the image quality adjustment data at the time of "focus priority" stored in the storage means based on the operation of the user switch, or Image quality adjustment data reading means for reading the image quality adjustment data in the case of "brightness priority", and the screen voltage, the control electrode voltage, and the cathode voltage based on the image quality adjustment data read by the image quality adjustment data reading means. An image quality adjusting circuit device for a CRT display screen, characterized in that 18. A main amplifier circuit for amplifying a video signal,
A cutoff control circuit for generating a DC component of the video signal amplified by the main amplifier circuit and supplying it to the cathode electrode;
A control electrode voltage generating circuit for generating a control electrode voltage of a control electrode of a CRT display;
A CRT display screen for adjusting the cathode voltage, the control electrode voltage, and the screen voltage in a CRT drive circuit having a screen voltage generation circuit for generating a screen voltage of a screen electrode, and adjusting the image quality of the CRT display screen. The image quality adjusting circuit device further comprises adjusting means for adjusting a load resistance value of the main amplifier circuit for amplifying a video signal based on an operation of a user switch.